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.strmout[i].chunks_on_queues = 0;
3633                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3634                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3635 #if defined(SCTP_DETAILED_STR_STATS)
3636                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3637                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3638                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3639                                                 }
3640 #else
3641                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3642                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3643 #endif
3644                                                 stcb->asoc.strmout[i].sid = i;
3645                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3646                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3647                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
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 static int
5236 sctp_are_there_new_addresses(struct sctp_association *asoc,
5237     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5238 {
5239         /*
5240          * Given a INIT packet, look through the packet to verify that there
5241          * are NO new addresses. As we go through the parameters add reports
5242          * of any un-understood parameters that require an error.  Also we
5243          * must return (1) to drop the packet if we see a un-understood
5244          * parameter that tells us to drop the chunk.
5245          */
5246         struct sockaddr *sa_touse;
5247         struct sockaddr *sa;
5248         struct sctp_paramhdr *phdr, params;
5249         uint16_t ptype, plen;
5250         uint8_t fnd;
5251         struct sctp_nets *net;
5252         int check_src;
5253 #ifdef INET
5254         struct sockaddr_in sin4, *sa4;
5255 #endif
5256 #ifdef INET6
5257         struct sockaddr_in6 sin6, *sa6;
5258 #endif
5259
5260 #ifdef INET
5261         memset(&sin4, 0, sizeof(sin4));
5262         sin4.sin_family = AF_INET;
5263         sin4.sin_len = sizeof(sin4);
5264 #endif
5265 #ifdef INET6
5266         memset(&sin6, 0, sizeof(sin6));
5267         sin6.sin6_family = AF_INET6;
5268         sin6.sin6_len = sizeof(sin6);
5269 #endif
5270         /* First what about the src address of the pkt ? */
5271         check_src = 0;
5272         switch (src->sa_family) {
5273 #ifdef INET
5274         case AF_INET:
5275                 if (asoc->scope.ipv4_addr_legal) {
5276                         check_src = 1;
5277                 }
5278                 break;
5279 #endif
5280 #ifdef INET6
5281         case AF_INET6:
5282                 if (asoc->scope.ipv6_addr_legal) {
5283                         check_src = 1;
5284                 }
5285                 break;
5286 #endif
5287         default:
5288                 /* TSNH */
5289                 break;
5290         }
5291         if (check_src) {
5292                 fnd = 0;
5293                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5294                         sa = (struct sockaddr *)&net->ro._l_addr;
5295                         if (sa->sa_family == src->sa_family) {
5296 #ifdef INET
5297                                 if (sa->sa_family == AF_INET) {
5298                                         struct sockaddr_in *src4;
5299
5300                                         sa4 = (struct sockaddr_in *)sa;
5301                                         src4 = (struct sockaddr_in *)src;
5302                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5303                                                 fnd = 1;
5304                                                 break;
5305                                         }
5306                                 }
5307 #endif
5308 #ifdef INET6
5309                                 if (sa->sa_family == AF_INET6) {
5310                                         struct sockaddr_in6 *src6;
5311
5312                                         sa6 = (struct sockaddr_in6 *)sa;
5313                                         src6 = (struct sockaddr_in6 *)src;
5314                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5315                                                 fnd = 1;
5316                                                 break;
5317                                         }
5318                                 }
5319 #endif
5320                         }
5321                 }
5322                 if (fnd == 0) {
5323                         /* New address added! no need to look further. */
5324                         return (1);
5325                 }
5326         }
5327         /* Ok so far lets munge through the rest of the packet */
5328         offset += sizeof(struct sctp_init_chunk);
5329         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5330         while (phdr) {
5331                 sa_touse = NULL;
5332                 ptype = ntohs(phdr->param_type);
5333                 plen = ntohs(phdr->param_length);
5334                 switch (ptype) {
5335 #ifdef INET
5336                 case SCTP_IPV4_ADDRESS:
5337                         {
5338                                 struct sctp_ipv4addr_param *p4, p4_buf;
5339
5340                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5341                                         return (1);
5342                                 }
5343                                 phdr = sctp_get_next_param(in_initpkt, offset,
5344                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5345                                 if (phdr == NULL) {
5346                                         return (1);
5347                                 }
5348                                 if (asoc->scope.ipv4_addr_legal) {
5349                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5350                                         sin4.sin_addr.s_addr = p4->addr;
5351                                         sa_touse = (struct sockaddr *)&sin4;
5352                                 }
5353                                 break;
5354                         }
5355 #endif
5356 #ifdef INET6
5357                 case SCTP_IPV6_ADDRESS:
5358                         {
5359                                 struct sctp_ipv6addr_param *p6, p6_buf;
5360
5361                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5362                                         return (1);
5363                                 }
5364                                 phdr = sctp_get_next_param(in_initpkt, offset,
5365                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5366                                 if (phdr == NULL) {
5367                                         return (1);
5368                                 }
5369                                 if (asoc->scope.ipv6_addr_legal) {
5370                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5371                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5372                                             sizeof(p6->addr));
5373                                         sa_touse = (struct sockaddr *)&sin6;
5374                                 }
5375                                 break;
5376                         }
5377 #endif
5378                 default:
5379                         sa_touse = NULL;
5380                         break;
5381                 }
5382                 if (sa_touse) {
5383                         /* ok, sa_touse points to one to check */
5384                         fnd = 0;
5385                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5386                                 sa = (struct sockaddr *)&net->ro._l_addr;
5387                                 if (sa->sa_family != sa_touse->sa_family) {
5388                                         continue;
5389                                 }
5390 #ifdef INET
5391                                 if (sa->sa_family == AF_INET) {
5392                                         sa4 = (struct sockaddr_in *)sa;
5393                                         if (sa4->sin_addr.s_addr ==
5394                                             sin4.sin_addr.s_addr) {
5395                                                 fnd = 1;
5396                                                 break;
5397                                         }
5398                                 }
5399 #endif
5400 #ifdef INET6
5401                                 if (sa->sa_family == AF_INET6) {
5402                                         sa6 = (struct sockaddr_in6 *)sa;
5403                                         if (SCTP6_ARE_ADDR_EQUAL(
5404                                             sa6, &sin6)) {
5405                                                 fnd = 1;
5406                                                 break;
5407                                         }
5408                                 }
5409 #endif
5410                         }
5411                         if (!fnd) {
5412                                 /* New addr added! no need to look further */
5413                                 return (1);
5414                         }
5415                 }
5416                 offset += SCTP_SIZE32(plen);
5417                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5418         }
5419         return (0);
5420 }
5421
5422 /*
5423  * Given a MBUF chain that was sent into us containing an INIT. Build a
5424  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5425  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5426  * message (i.e. the struct sctp_init_msg).
5427  */
5428 void
5429 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5430     struct sctp_nets *src_net, struct mbuf *init_pkt,
5431     int iphlen, int offset,
5432     struct sockaddr *src, struct sockaddr *dst,
5433     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5434     uint8_t mflowtype, uint32_t mflowid,
5435     uint32_t vrf_id, uint16_t port)
5436 {
5437         struct sctp_association *asoc;
5438         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5439         struct sctp_init_ack_chunk *initack;
5440         struct sctp_adaptation_layer_indication *ali;
5441         struct sctp_supported_chunk_types_param *pr_supported;
5442         struct sctp_paramhdr *ph;
5443         union sctp_sockstore *over_addr;
5444         struct sctp_scoping scp;
5445         struct timeval now;
5446 #ifdef INET
5447         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5448         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5449         struct sockaddr_in *sin;
5450 #endif
5451 #ifdef INET6
5452         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5453         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5454         struct sockaddr_in6 *sin6;
5455 #endif
5456         struct sockaddr *to;
5457         struct sctp_state_cookie stc;
5458         struct sctp_nets *net = NULL;
5459         uint8_t *signature = NULL;
5460         int cnt_inits_to = 0;
5461         uint16_t his_limit, i_want;
5462         int abort_flag;
5463         int nat_friendly = 0;
5464         int error;
5465         struct socket *so;
5466         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5467
5468         if (stcb) {
5469                 asoc = &stcb->asoc;
5470         } else {
5471                 asoc = NULL;
5472         }
5473         if ((asoc != NULL) &&
5474             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5475                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5476                         /*
5477                          * new addresses, out of here in non-cookie-wait
5478                          * states
5479                          *
5480                          * Send an ABORT, without the new address error
5481                          * cause. This looks no different than if no
5482                          * listener was present.
5483                          */
5484                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5485                             "Address added");
5486                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5487                             mflowtype, mflowid, inp->fibnum,
5488                             vrf_id, port);
5489                         return;
5490                 }
5491                 if (src_net != NULL && (src_net->port != port)) {
5492                         /*
5493                          * change of remote encapsulation port, out of here
5494                          * in non-cookie-wait states
5495                          *
5496                          * Send an ABORT, without an specific error cause.
5497                          * This looks no different than if no listener was
5498                          * present.
5499                          */
5500                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5501                             "Remote encapsulation port changed");
5502                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5503                             mflowtype, mflowid, inp->fibnum,
5504                             vrf_id, port);
5505                         return;
5506                 }
5507         }
5508         abort_flag = 0;
5509         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5510             (offset + sizeof(struct sctp_init_chunk)),
5511             &abort_flag,
5512             (struct sctp_chunkhdr *)init_chk,
5513             &nat_friendly, NULL);
5514         if (abort_flag) {
5515 do_a_abort:
5516                 if (op_err == NULL) {
5517                         char msg[SCTP_DIAG_INFO_LEN];
5518
5519                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5520                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5521                             msg);
5522                 }
5523                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5524                     init_chk->init.initiate_tag, op_err,
5525                     mflowtype, mflowid, inp->fibnum,
5526                     vrf_id, port);
5527                 return;
5528         }
5529         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5530         if (m == NULL) {
5531                 /* No memory, INIT timer will re-attempt. */
5532                 sctp_m_freem(op_err);
5533                 return;
5534         }
5535         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5536         padding_len = 0;
5537
5538         /*
5539          * We might not overwrite the identification[] completely and on
5540          * some platforms time_entered will contain some padding. Therefore
5541          * zero out the cookie to avoid putting uninitialized memory on the
5542          * wire.
5543          */
5544         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5545
5546         /* the time I built cookie */
5547         (void)SCTP_GETTIME_TIMEVAL(&now);
5548         stc.time_entered.tv_sec = now.tv_sec;
5549         stc.time_entered.tv_usec = now.tv_usec;
5550
5551         /* populate any tie tags */
5552         if (asoc != NULL) {
5553                 /* unlock before tag selections */
5554                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5555                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5556                 stc.cookie_life = asoc->cookie_life;
5557                 net = asoc->primary_destination;
5558         } else {
5559                 stc.tie_tag_my_vtag = 0;
5560                 stc.tie_tag_peer_vtag = 0;
5561                 /* life I will award this cookie */
5562                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5563         }
5564
5565         /* copy in the ports for later check */
5566         stc.myport = sh->dest_port;
5567         stc.peerport = sh->src_port;
5568
5569         /*
5570          * If we wanted to honor cookie life extensions, we would add to
5571          * stc.cookie_life. For now we should NOT honor any extension
5572          */
5573         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5574         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5575                 stc.ipv6_addr_legal = 1;
5576                 if (SCTP_IPV6_V6ONLY(inp)) {
5577                         stc.ipv4_addr_legal = 0;
5578                 } else {
5579                         stc.ipv4_addr_legal = 1;
5580                 }
5581         } else {
5582                 stc.ipv6_addr_legal = 0;
5583                 stc.ipv4_addr_legal = 1;
5584         }
5585         stc.ipv4_scope = 0;
5586         if (net == NULL) {
5587                 to = src;
5588                 switch (dst->sa_family) {
5589 #ifdef INET
5590                 case AF_INET:
5591                         {
5592                                 /* lookup address */
5593                                 stc.address[0] = src4->sin_addr.s_addr;
5594                                 stc.address[1] = 0;
5595                                 stc.address[2] = 0;
5596                                 stc.address[3] = 0;
5597                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5598                                 /* local from address */
5599                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5600                                 stc.laddress[1] = 0;
5601                                 stc.laddress[2] = 0;
5602                                 stc.laddress[3] = 0;
5603                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5604                                 /* scope_id is only for v6 */
5605                                 stc.scope_id = 0;
5606                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5607                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5608                                         stc.ipv4_scope = 1;
5609                                 }
5610                                 /* Must use the address in this case */
5611                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5612                                         stc.loopback_scope = 1;
5613                                         stc.ipv4_scope = 1;
5614                                         stc.site_scope = 1;
5615                                         stc.local_scope = 0;
5616                                 }
5617                                 break;
5618                         }
5619 #endif
5620 #ifdef INET6
5621                 case AF_INET6:
5622                         {
5623                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5624                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5625                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5626                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5627                                         stc.loopback_scope = 1;
5628                                         stc.local_scope = 0;
5629                                         stc.site_scope = 1;
5630                                         stc.ipv4_scope = 1;
5631                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5632                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5633                                         /*
5634                                          * If the new destination or source
5635                                          * is a LINK_LOCAL we must have
5636                                          * common both site and local scope.
5637                                          * Don't set local scope though
5638                                          * since we must depend on the
5639                                          * source to be added implicitly. We
5640                                          * cannot assure just because we
5641                                          * share one link that all links are
5642                                          * common.
5643                                          */
5644                                         stc.local_scope = 0;
5645                                         stc.site_scope = 1;
5646                                         stc.ipv4_scope = 1;
5647                                         /*
5648                                          * we start counting for the private
5649                                          * address stuff at 1. since the
5650                                          * link local we source from won't
5651                                          * show up in our scoped count.
5652                                          */
5653                                         cnt_inits_to = 1;
5654                                         /*
5655                                          * pull out the scope_id from
5656                                          * incoming pkt
5657                                          */
5658                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5659                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5660                                         /*
5661                                          * If the new destination or source
5662                                          * is SITE_LOCAL then we must have
5663                                          * site scope in common.
5664                                          */
5665                                         stc.site_scope = 1;
5666                                 }
5667                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5668                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5669                                 break;
5670                         }
5671 #endif
5672                 default:
5673                         /* TSNH */
5674                         goto do_a_abort;
5675                         break;
5676                 }
5677         } else {
5678                 /* set the scope per the existing tcb */
5679
5680 #ifdef INET6
5681                 struct sctp_nets *lnet;
5682 #endif
5683
5684                 stc.loopback_scope = asoc->scope.loopback_scope;
5685                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5686                 stc.site_scope = asoc->scope.site_scope;
5687                 stc.local_scope = asoc->scope.local_scope;
5688 #ifdef INET6
5689                 /* Why do we not consider IPv4 LL addresses? */
5690                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5691                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5692                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5693                                         /*
5694                                          * if we have a LL address, start
5695                                          * counting at 1.
5696                                          */
5697                                         cnt_inits_to = 1;
5698                                 }
5699                         }
5700                 }
5701 #endif
5702                 /* use the net pointer */
5703                 to = (struct sockaddr *)&net->ro._l_addr;
5704                 switch (to->sa_family) {
5705 #ifdef INET
5706                 case AF_INET:
5707                         sin = (struct sockaddr_in *)to;
5708                         stc.address[0] = sin->sin_addr.s_addr;
5709                         stc.address[1] = 0;
5710                         stc.address[2] = 0;
5711                         stc.address[3] = 0;
5712                         stc.addr_type = SCTP_IPV4_ADDRESS;
5713                         if (net->src_addr_selected == 0) {
5714                                 /*
5715                                  * strange case here, the INIT should have
5716                                  * did the selection.
5717                                  */
5718                                 net->ro._s_addr = sctp_source_address_selection(inp,
5719                                     stcb, (sctp_route_t *)&net->ro,
5720                                     net, 0, vrf_id);
5721                                 if (net->ro._s_addr == NULL) {
5722                                         sctp_m_freem(op_err);
5723                                         sctp_m_freem(m);
5724                                         return;
5725                                 }
5726
5727                                 net->src_addr_selected = 1;
5728                         }
5729                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5730                         stc.laddress[1] = 0;
5731                         stc.laddress[2] = 0;
5732                         stc.laddress[3] = 0;
5733                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5734                         /* scope_id is only for v6 */
5735                         stc.scope_id = 0;
5736                         break;
5737 #endif
5738 #ifdef INET6
5739                 case AF_INET6:
5740                         sin6 = (struct sockaddr_in6 *)to;
5741                         memcpy(&stc.address, &sin6->sin6_addr,
5742                             sizeof(struct in6_addr));
5743                         stc.addr_type = SCTP_IPV6_ADDRESS;
5744                         stc.scope_id = sin6->sin6_scope_id;
5745                         if (net->src_addr_selected == 0) {
5746                                 /*
5747                                  * strange case here, the INIT should have
5748                                  * done the selection.
5749                                  */
5750                                 net->ro._s_addr = sctp_source_address_selection(inp,
5751                                     stcb, (sctp_route_t *)&net->ro,
5752                                     net, 0, vrf_id);
5753                                 if (net->ro._s_addr == NULL) {
5754                                         sctp_m_freem(op_err);
5755                                         sctp_m_freem(m);
5756                                         return;
5757                                 }
5758
5759                                 net->src_addr_selected = 1;
5760                         }
5761                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5762                             sizeof(struct in6_addr));
5763                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5764                         break;
5765 #endif
5766                 }
5767         }
5768         /* Now lets put the SCTP header in place */
5769         initack = mtod(m, struct sctp_init_ack_chunk *);
5770         /* Save it off for quick ref */
5771         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5772         /* who are we */
5773         memcpy(stc.identification, SCTP_VERSION_STRING,
5774             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5775         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5776         /* now the chunk header */
5777         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5778         initack->ch.chunk_flags = 0;
5779         /* fill in later from mbuf we build */
5780         initack->ch.chunk_length = 0;
5781         /* place in my tag */
5782         if ((asoc != NULL) &&
5783             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5784             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5785             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5786                 /* re-use the v-tags and init-seq here */
5787                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5788                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5789         } else {
5790                 uint32_t vtag, itsn;
5791
5792                 if (asoc) {
5793                         atomic_add_int(&asoc->refcnt, 1);
5794                         SCTP_TCB_UNLOCK(stcb);
5795         new_tag:
5796                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5797                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5798                                 /*
5799                                  * Got a duplicate vtag on some guy behind a
5800                                  * nat make sure we don't use it.
5801                                  */
5802                                 goto new_tag;
5803                         }
5804                         initack->init.initiate_tag = htonl(vtag);
5805                         /* get a TSN to use too */
5806                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5807                         initack->init.initial_tsn = htonl(itsn);
5808                         SCTP_TCB_LOCK(stcb);
5809                         atomic_add_int(&asoc->refcnt, -1);
5810                 } else {
5811                         SCTP_INP_INCR_REF(inp);
5812                         SCTP_INP_RUNLOCK(inp);
5813                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5814                         initack->init.initiate_tag = htonl(vtag);
5815                         /* get a TSN to use too */
5816                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5817                         SCTP_INP_RLOCK(inp);
5818                         SCTP_INP_DECR_REF(inp);
5819                 }
5820         }
5821         /* save away my tag to */
5822         stc.my_vtag = initack->init.initiate_tag;
5823
5824         /* set up some of the credits. */
5825         so = inp->sctp_socket;
5826         if (so == NULL) {
5827                 /* memory problem */
5828                 sctp_m_freem(op_err);
5829                 sctp_m_freem(m);
5830                 return;
5831         } else {
5832                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5833         }
5834         /* set what I want */
5835         his_limit = ntohs(init_chk->init.num_inbound_streams);
5836         /* choose what I want */
5837         if (asoc != NULL) {
5838                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5839                         i_want = asoc->streamoutcnt;
5840                 } else {
5841                         i_want = asoc->pre_open_streams;
5842                 }
5843         } else {
5844                 i_want = inp->sctp_ep.pre_open_stream_count;
5845         }
5846         if (his_limit < i_want) {
5847                 /* I Want more :< */
5848                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5849         } else {
5850                 /* I can have what I want :> */
5851                 initack->init.num_outbound_streams = htons(i_want);
5852         }
5853         /* tell him his limit. */
5854         initack->init.num_inbound_streams =
5855             htons(inp->sctp_ep.max_open_streams_intome);
5856
5857         /* adaptation layer indication parameter */
5858         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5859                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5860                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5861                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5862                 ali->ph.param_length = htons(parameter_len);
5863                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5864                 chunk_len += parameter_len;
5865         }
5866
5867         /* ECN parameter */
5868         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5869             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5870                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5871                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5872                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5873                 ph->param_length = htons(parameter_len);
5874                 chunk_len += parameter_len;
5875         }
5876
5877         /* PR-SCTP supported parameter */
5878         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5879             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5880                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5881                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5882                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5883                 ph->param_length = htons(parameter_len);
5884                 chunk_len += parameter_len;
5885         }
5886
5887         /* Add NAT friendly parameter */
5888         if (nat_friendly) {
5889                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5890                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5891                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5892                 ph->param_length = htons(parameter_len);
5893                 chunk_len += parameter_len;
5894         }
5895
5896         /* And now tell the peer which extensions we support */
5897         num_ext = 0;
5898         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5899         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5900             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5901                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5902                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5903                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5904                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5905                 }
5906         }
5907         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5908             ((asoc == NULL) && (inp->auth_supported == 1))) {
5909                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5910         }
5911         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5912             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5913                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5914                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5915         }
5916         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5917             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5918                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5919         }
5920         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5921             ((asoc == NULL) && (inp->idata_supported == 1))) {
5922                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5923         }
5924         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5925             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5926                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5927         }
5928         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5929             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5930                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5931         }
5932         if (num_ext > 0) {
5933                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5934                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5935                 pr_supported->ph.param_length = htons(parameter_len);
5936                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5937                 chunk_len += parameter_len;
5938         }
5939
5940         /* add authentication parameters */
5941         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5942             ((asoc == NULL) && (inp->auth_supported == 1))) {
5943                 struct sctp_auth_random *randp;
5944                 struct sctp_auth_hmac_algo *hmacs;
5945                 struct sctp_auth_chunk_list *chunks;
5946
5947                 if (padding_len > 0) {
5948                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5949                         chunk_len += padding_len;
5950                         padding_len = 0;
5951                 }
5952                 /* generate and add RANDOM parameter */
5953                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5954                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5955                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5956                 randp->ph.param_type = htons(SCTP_RANDOM);
5957                 randp->ph.param_length = htons(parameter_len);
5958                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5959                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5960                 chunk_len += parameter_len;
5961
5962                 if (padding_len > 0) {
5963                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5964                         chunk_len += padding_len;
5965                         padding_len = 0;
5966                 }
5967                 /* add HMAC_ALGO parameter */
5968                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5969                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
5970                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5971                     (uint8_t *)hmacs->hmac_ids);
5972                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5973                 hmacs->ph.param_length = htons(parameter_len);
5974                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5975                 chunk_len += parameter_len;
5976
5977                 if (padding_len > 0) {
5978                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5979                         chunk_len += padding_len;
5980                         padding_len = 0;
5981                 }
5982                 /* add CHUNKS parameter */
5983                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
5984                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
5985                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5986                     chunks->chunk_types);
5987                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5988                 chunks->ph.param_length = htons(parameter_len);
5989                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5990                 chunk_len += parameter_len;
5991         }
5992         SCTP_BUF_LEN(m) = chunk_len;
5993         m_last = m;
5994         /* now the addresses */
5995         /*
5996          * To optimize this we could put the scoping stuff into a structure
5997          * and remove the individual uint8's from the stc structure. Then we
5998          * could just sifa in the address within the stc.. but for now this
5999          * is a quick hack to get the address stuff teased apart.
6000          */
6001         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6002         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6003         scp.loopback_scope = stc.loopback_scope;
6004         scp.ipv4_local_scope = stc.ipv4_scope;
6005         scp.local_scope = stc.local_scope;
6006         scp.site_scope = stc.site_scope;
6007         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6008             cnt_inits_to,
6009             &padding_len, &chunk_len);
6010         /* padding_len can only be positive, if no addresses have been added */
6011         if (padding_len > 0) {
6012                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6013                 chunk_len += padding_len;
6014                 SCTP_BUF_LEN(m) += padding_len;
6015                 padding_len = 0;
6016         }
6017
6018         /* tack on the operational error if present */
6019         if (op_err) {
6020                 parameter_len = 0;
6021                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6022                         parameter_len += SCTP_BUF_LEN(m_tmp);
6023                 }
6024                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6025                 SCTP_BUF_NEXT(m_last) = op_err;
6026                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6027                         m_last = SCTP_BUF_NEXT(m_last);
6028                 }
6029                 chunk_len += parameter_len;
6030         }
6031         if (padding_len > 0) {
6032                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6033                 if (m_last == NULL) {
6034                         /* Houston we have a problem, no space */
6035                         sctp_m_freem(m);
6036                         return;
6037                 }
6038                 chunk_len += padding_len;
6039                 padding_len = 0;
6040         }
6041         /* Now we must build a cookie */
6042         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6043         if (m_cookie == NULL) {
6044                 /* memory problem */
6045                 sctp_m_freem(m);
6046                 return;
6047         }
6048         /* Now append the cookie to the end and update the space/size */
6049         SCTP_BUF_NEXT(m_last) = m_cookie;
6050         parameter_len = 0;
6051         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6052                 parameter_len += SCTP_BUF_LEN(m_tmp);
6053                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6054                         m_last = m_tmp;
6055                 }
6056         }
6057         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6058         chunk_len += parameter_len;
6059
6060         /*
6061          * Place in the size, but we don't include the last pad (if any) in
6062          * the INIT-ACK.
6063          */
6064         initack->ch.chunk_length = htons(chunk_len);
6065
6066         /*
6067          * Time to sign the cookie, we don't sign over the cookie signature
6068          * though thus we set trailer.
6069          */
6070         (void)sctp_hmac_m(SCTP_HMAC,
6071             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6072             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6073             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6074         /*
6075          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6076          * here since the timer will drive a retranmission.
6077          */
6078         if (padding_len > 0) {
6079                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6080                         sctp_m_freem(m);
6081                         return;
6082                 }
6083         }
6084         if (stc.loopback_scope) {
6085                 over_addr = (union sctp_sockstore *)dst;
6086         } else {
6087                 over_addr = NULL;
6088         }
6089
6090         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6091             0, 0,
6092             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6093             port, over_addr,
6094             mflowtype, mflowid,
6095             SCTP_SO_NOT_LOCKED))) {
6096                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6097                 if (error == ENOBUFS) {
6098                         if (asoc != NULL) {
6099                                 asoc->ifp_had_enobuf = 1;
6100                         }
6101                         SCTP_STAT_INCR(sctps_lowlevelerr);
6102                 }
6103         } else {
6104                 if (asoc != NULL) {
6105                         asoc->ifp_had_enobuf = 0;
6106                 }
6107         }
6108         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6109 }
6110
6111 static void
6112 sctp_prune_prsctp(struct sctp_tcb *stcb,
6113     struct sctp_association *asoc,
6114     struct sctp_sndrcvinfo *srcv,
6115     int dataout)
6116 {
6117         int freed_spc = 0;
6118         struct sctp_tmit_chunk *chk, *nchk;
6119
6120         SCTP_TCB_LOCK_ASSERT(stcb);
6121         if ((asoc->prsctp_supported) &&
6122             (asoc->sent_queue_cnt_removeable > 0)) {
6123                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6124                         /*
6125                          * Look for chunks marked with the PR_SCTP flag AND
6126                          * the buffer space flag. If the one being sent is
6127                          * equal or greater priority then purge the old one
6128                          * and free some space.
6129                          */
6130                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6131                                 /*
6132                                  * This one is PR-SCTP AND buffer space
6133                                  * limited type
6134                                  */
6135                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6136                                         /*
6137                                          * Lower numbers equates to higher
6138                                          * priority. So if the one we are
6139                                          * looking at has a larger priority,
6140                                          * we want to drop the data and NOT
6141                                          * retransmit it.
6142                                          */
6143                                         if (chk->data) {
6144                                                 /*
6145                                                  * We release the book_size
6146                                                  * if the mbuf is here
6147                                                  */
6148                                                 int ret_spc;
6149                                                 uint8_t sent;
6150
6151                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6152                                                         sent = 1;
6153                                                 else
6154                                                         sent = 0;
6155                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6156                                                     sent,
6157                                                     SCTP_SO_LOCKED);
6158                                                 freed_spc += ret_spc;
6159                                                 if (freed_spc >= dataout) {
6160                                                         return;
6161                                                 }
6162                                         }       /* if chunk was present */
6163                                 }       /* if of sufficient priority */
6164                         }       /* if chunk has enabled */
6165                 }               /* tailqforeach */
6166
6167                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6168                         /* Here we must move to the sent queue and mark */
6169                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6170                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6171                                         if (chk->data) {
6172                                                 /*
6173                                                  * We release the book_size
6174                                                  * if the mbuf is here
6175                                                  */
6176                                                 int ret_spc;
6177
6178                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6179                                                     0, SCTP_SO_LOCKED);
6180
6181                                                 freed_spc += ret_spc;
6182                                                 if (freed_spc >= dataout) {
6183                                                         return;
6184                                                 }
6185                                         }       /* end if chk->data */
6186                                 }       /* end if right class */
6187                         }       /* end if chk pr-sctp */
6188                 }               /* tailqforeachsafe (chk) */
6189         }                       /* if enabled in asoc */
6190 }
6191
6192 int
6193 sctp_get_frag_point(struct sctp_tcb *stcb,
6194     struct sctp_association *asoc)
6195 {
6196         int siz, ovh;
6197
6198         /*
6199          * For endpoints that have both v6 and v4 addresses we must reserve
6200          * room for the ipv6 header, for those that are only dealing with V4
6201          * we use a larger frag point.
6202          */
6203         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6204                 ovh = SCTP_MIN_OVERHEAD;
6205         } else {
6206                 ovh = SCTP_MIN_V4_OVERHEAD;
6207         }
6208         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6209         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6210                 siz = asoc->smallest_mtu - ovh;
6211         else
6212                 siz = (stcb->asoc.sctp_frag_point - ovh);
6213         /*
6214          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6215          */
6216         /* A data chunk MUST fit in a cluster */
6217         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6218         /* } */
6219
6220         /* adjust for an AUTH chunk if DATA requires auth */
6221         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6222                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6223
6224         if (siz % 4) {
6225                 /* make it an even word boundary please */
6226                 siz -= (siz % 4);
6227         }
6228         return (siz);
6229 }
6230
6231 static void
6232 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6233 {
6234         /*
6235          * We assume that the user wants PR_SCTP_TTL if the user provides a
6236          * positive lifetime but does not specify any PR_SCTP policy.
6237          */
6238         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6239                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6240         } else if (sp->timetolive > 0) {
6241                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6242                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6243         } else {
6244                 return;
6245         }
6246         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6247         case CHUNK_FLAGS_PR_SCTP_BUF:
6248                 /*
6249                  * Time to live is a priority stored in tv_sec when doing
6250                  * the buffer drop thing.
6251                  */
6252                 sp->ts.tv_sec = sp->timetolive;
6253                 sp->ts.tv_usec = 0;
6254                 break;
6255         case CHUNK_FLAGS_PR_SCTP_TTL:
6256                 {
6257                         struct timeval tv;
6258
6259                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6260                         tv.tv_sec = sp->timetolive / 1000;
6261                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6262                         /*
6263                          * TODO sctp_constants.h needs alternative time
6264                          * macros when _KERNEL is undefined.
6265                          */
6266                         timevaladd(&sp->ts, &tv);
6267                 }
6268                 break;
6269         case CHUNK_FLAGS_PR_SCTP_RTX:
6270                 /*
6271                  * Time to live is a the number or retransmissions stored in
6272                  * tv_sec.
6273                  */
6274                 sp->ts.tv_sec = sp->timetolive;
6275                 sp->ts.tv_usec = 0;
6276                 break;
6277         default:
6278                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6279                     "Unknown PR_SCTP policy %u.\n",
6280                     PR_SCTP_POLICY(sp->sinfo_flags));
6281                 break;
6282         }
6283 }
6284
6285 static int
6286 sctp_msg_append(struct sctp_tcb *stcb,
6287     struct sctp_nets *net,
6288     struct mbuf *m,
6289     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6290 {
6291         int error = 0;
6292         struct mbuf *at;
6293         struct sctp_stream_queue_pending *sp = NULL;
6294         struct sctp_stream_out *strm;
6295
6296         /*
6297          * Given an mbuf chain, put it into the association send queue and
6298          * place it on the wheel
6299          */
6300         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6301                 /* Invalid stream number */
6302                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6303                 error = EINVAL;
6304                 goto out_now;
6305         }
6306         if ((stcb->asoc.stream_locked) &&
6307             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6308                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6309                 error = EINVAL;
6310                 goto out_now;
6311         }
6312         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6313         /* Now can we send this? */
6314         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6315             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6316             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6317             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6318                 /* got data while shutting down */
6319                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6320                 error = ECONNRESET;
6321                 goto out_now;
6322         }
6323         sctp_alloc_a_strmoq(stcb, sp);
6324         if (sp == NULL) {
6325                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6326                 error = ENOMEM;
6327                 goto out_now;
6328         }
6329         sp->sinfo_flags = srcv->sinfo_flags;
6330         sp->timetolive = srcv->sinfo_timetolive;
6331         sp->ppid = srcv->sinfo_ppid;
6332         sp->context = srcv->sinfo_context;
6333         sp->fsn = 0;
6334         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6335                 sp->net = net;
6336                 atomic_add_int(&sp->net->ref_count, 1);
6337         } else {
6338                 sp->net = NULL;
6339         }
6340         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6341         sp->sid = srcv->sinfo_stream;
6342         sp->msg_is_complete = 1;
6343         sp->sender_all_done = 1;
6344         sp->some_taken = 0;
6345         sp->data = m;
6346         sp->tail_mbuf = NULL;
6347         sctp_set_prsctp_policy(sp);
6348         /*
6349          * We could in theory (for sendall) sifa the length in, but we would
6350          * still have to hunt through the chain since we need to setup the
6351          * tail_mbuf
6352          */
6353         sp->length = 0;
6354         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6355                 if (SCTP_BUF_NEXT(at) == NULL)
6356                         sp->tail_mbuf = at;
6357                 sp->length += SCTP_BUF_LEN(at);
6358         }
6359         if (srcv->sinfo_keynumber_valid) {
6360                 sp->auth_keyid = srcv->sinfo_keynumber;
6361         } else {
6362                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6363         }
6364         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6365                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6366                 sp->holds_key_ref = 1;
6367         }
6368         if (hold_stcb_lock == 0) {
6369                 SCTP_TCB_SEND_LOCK(stcb);
6370         }
6371         sctp_snd_sb_alloc(stcb, sp->length);
6372         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6373         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6374         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6375         m = NULL;
6376         if (hold_stcb_lock == 0) {
6377                 SCTP_TCB_SEND_UNLOCK(stcb);
6378         }
6379 out_now:
6380         if (m) {
6381                 sctp_m_freem(m);
6382         }
6383         return (error);
6384 }
6385
6386 static struct mbuf *
6387 sctp_copy_mbufchain(struct mbuf *clonechain,
6388     struct mbuf *outchain,
6389     struct mbuf **endofchain,
6390     int can_take_mbuf,
6391     int sizeofcpy,
6392     uint8_t copy_by_ref)
6393 {
6394         struct mbuf *m;
6395         struct mbuf *appendchain;
6396         caddr_t cp;
6397         int len;
6398
6399         if (endofchain == NULL) {
6400                 /* error */
6401 error_out:
6402                 if (outchain)
6403                         sctp_m_freem(outchain);
6404                 return (NULL);
6405         }
6406         if (can_take_mbuf) {
6407                 appendchain = clonechain;
6408         } else {
6409                 if (!copy_by_ref &&
6410                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6411                         /* Its not in a cluster */
6412                         if (*endofchain == NULL) {
6413                                 /* lets get a mbuf cluster */
6414                                 if (outchain == NULL) {
6415                                         /* This is the general case */
6416                         new_mbuf:
6417                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6418                                         if (outchain == NULL) {
6419                                                 goto error_out;
6420                                         }
6421                                         SCTP_BUF_LEN(outchain) = 0;
6422                                         *endofchain = outchain;
6423                                         /* get the prepend space */
6424                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6425                                 } else {
6426                                         /*
6427                                          * We really should not get a NULL
6428                                          * in endofchain
6429                                          */
6430                                         /* find end */
6431                                         m = outchain;
6432                                         while (m) {
6433                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6434                                                         *endofchain = m;
6435                                                         break;
6436                                                 }
6437                                                 m = SCTP_BUF_NEXT(m);
6438                                         }
6439                                         /* sanity */
6440                                         if (*endofchain == NULL) {
6441                                                 /*
6442                                                  * huh, TSNH XXX maybe we
6443                                                  * should panic
6444                                                  */
6445                                                 sctp_m_freem(outchain);
6446                                                 goto new_mbuf;
6447                                         }
6448                                 }
6449                                 /* get the new end of length */
6450                                 len = (int)M_TRAILINGSPACE(*endofchain);
6451                         } else {
6452                                 /* how much is left at the end? */
6453                                 len = (int)M_TRAILINGSPACE(*endofchain);
6454                         }
6455                         /* Find the end of the data, for appending */
6456                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6457
6458                         /* Now lets copy it out */
6459                         if (len >= sizeofcpy) {
6460                                 /* It all fits, copy it in */
6461                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6462                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6463                         } else {
6464                                 /* fill up the end of the chain */
6465                                 if (len > 0) {
6466                                         m_copydata(clonechain, 0, len, cp);
6467                                         SCTP_BUF_LEN((*endofchain)) += len;
6468                                         /* now we need another one */
6469                                         sizeofcpy -= len;
6470                                 }
6471                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6472                                 if (m == NULL) {
6473                                         /* We failed */
6474                                         goto error_out;
6475                                 }
6476                                 SCTP_BUF_NEXT((*endofchain)) = m;
6477                                 *endofchain = m;
6478                                 cp = mtod((*endofchain), caddr_t);
6479                                 m_copydata(clonechain, len, sizeofcpy, cp);
6480                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6481                         }
6482                         return (outchain);
6483                 } else {
6484                         /* copy the old fashion way */
6485                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6486 #ifdef SCTP_MBUF_LOGGING
6487                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6488                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6489                         }
6490 #endif
6491                 }
6492         }
6493         if (appendchain == NULL) {
6494                 /* error */
6495                 if (outchain)
6496                         sctp_m_freem(outchain);
6497                 return (NULL);
6498         }
6499         if (outchain) {
6500                 /* tack on to the end */
6501                 if (*endofchain != NULL) {
6502                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6503                 } else {
6504                         m = outchain;
6505                         while (m) {
6506                                 if (SCTP_BUF_NEXT(m) == NULL) {
6507                                         SCTP_BUF_NEXT(m) = appendchain;
6508                                         break;
6509                                 }
6510                                 m = SCTP_BUF_NEXT(m);
6511                         }
6512                 }
6513                 /*
6514                  * save off the end and update the end-chain position
6515                  */
6516                 m = appendchain;
6517                 while (m) {
6518                         if (SCTP_BUF_NEXT(m) == NULL) {
6519                                 *endofchain = m;
6520                                 break;
6521                         }
6522                         m = SCTP_BUF_NEXT(m);
6523                 }
6524                 return (outchain);
6525         } else {
6526                 /* save off the end and update the end-chain position */
6527                 m = appendchain;
6528                 while (m) {
6529                         if (SCTP_BUF_NEXT(m) == NULL) {
6530                                 *endofchain = m;
6531                                 break;
6532                         }
6533                         m = SCTP_BUF_NEXT(m);
6534                 }
6535                 return (appendchain);
6536         }
6537 }
6538
6539 static int
6540 sctp_med_chunk_output(struct sctp_inpcb *inp,
6541     struct sctp_tcb *stcb,
6542     struct sctp_association *asoc,
6543     int *num_out,
6544     int *reason_code,
6545     int control_only, int from_where,
6546     struct timeval *now, int *now_filled, int frag_point, int so_locked);
6547
6548 static void
6549 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6550     uint32_t val SCTP_UNUSED)
6551 {
6552         struct sctp_copy_all *ca;
6553         struct mbuf *m;
6554         int ret = 0;
6555         int added_control = 0;
6556         int un_sent, do_chunk_output = 1;
6557         struct sctp_association *asoc;
6558         struct sctp_nets *net;
6559
6560         ca = (struct sctp_copy_all *)ptr;
6561         if (ca->m == NULL) {
6562                 return;
6563         }
6564         if (ca->inp != inp) {
6565                 /* TSNH */
6566                 return;
6567         }
6568         if (ca->sndlen > 0) {
6569                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6570                 if (m == NULL) {
6571                         /* can't copy so we are done */
6572                         ca->cnt_failed++;
6573                         return;
6574                 }
6575 #ifdef SCTP_MBUF_LOGGING
6576                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6577                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6578                 }
6579 #endif
6580         } else {
6581                 m = NULL;
6582         }
6583         SCTP_TCB_LOCK_ASSERT(stcb);
6584         if (stcb->asoc.alternate) {
6585                 net = stcb->asoc.alternate;
6586         } else {
6587                 net = stcb->asoc.primary_destination;
6588         }
6589         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6590                 /* Abort this assoc with m as the user defined reason */
6591                 if (m != NULL) {
6592                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6593                 } else {
6594                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6595                             0, M_NOWAIT, 1, MT_DATA);
6596                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6597                 }
6598                 if (m != NULL) {
6599                         struct sctp_paramhdr *ph;
6600
6601                         ph = mtod(m, struct sctp_paramhdr *);
6602                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6603                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6604                 }
6605                 /*
6606                  * We add one here to keep the assoc from dis-appearing on
6607                  * us.
6608                  */
6609                 atomic_add_int(&stcb->asoc.refcnt, 1);
6610                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6611                 /*
6612                  * sctp_abort_an_association calls sctp_free_asoc() free
6613                  * association will NOT free it since we incremented the
6614                  * refcnt .. we do this to prevent it being freed and things
6615                  * getting tricky since we could end up (from free_asoc)
6616                  * calling inpcb_free which would get a recursive lock call
6617                  * to the iterator lock.. But as a consequence of that the
6618                  * stcb will return to us un-locked.. since free_asoc
6619                  * returns with either no TCB or the TCB unlocked, we must
6620                  * relock.. to unlock in the iterator timer :-0
6621                  */
6622                 SCTP_TCB_LOCK(stcb);
6623                 atomic_add_int(&stcb->asoc.refcnt, -1);
6624                 goto no_chunk_output;
6625         } else {
6626                 if (m) {
6627                         ret = sctp_msg_append(stcb, net, m,
6628                             &ca->sndrcv, 1);
6629                 }
6630                 asoc = &stcb->asoc;
6631                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6632                         /* shutdown this assoc */
6633                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6634                             TAILQ_EMPTY(&asoc->sent_queue) &&
6635                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6636                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6637                                         goto abort_anyway;
6638                                 }
6639                                 /*
6640                                  * there is nothing queued to send, so I'm
6641                                  * done...
6642                                  */
6643                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6644                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6645                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6646                                         /*
6647                                          * only send SHUTDOWN the first time
6648                                          * through
6649                                          */
6650                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6651                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6652                                         }
6653                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6654                                         sctp_stop_timers_for_shutdown(stcb);
6655                                         sctp_send_shutdown(stcb, net);
6656                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6657                                             net);
6658                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6659                                             NULL);
6660                                         added_control = 1;
6661                                         do_chunk_output = 0;
6662                                 }
6663                         } else {
6664                                 /*
6665                                  * we still got (or just got) data to send,
6666                                  * so set SHUTDOWN_PENDING
6667                                  */
6668                                 /*
6669                                  * XXX sockets draft says that SCTP_EOF
6670                                  * should be sent with no data.  currently,
6671                                  * we will allow user data to be sent first
6672                                  * and move to SHUTDOWN-PENDING
6673                                  */
6674                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6675                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6676                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6677                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6678                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6679                                         }
6680                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6681                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6682                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6683                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6684                                                 struct mbuf *op_err;
6685                                                 char msg[SCTP_DIAG_INFO_LEN];
6686
6687                                 abort_anyway:
6688                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6689                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6690                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6691                                                     msg);
6692                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6693                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6694                                                     op_err, SCTP_SO_NOT_LOCKED);
6695                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6696                                                 goto no_chunk_output;
6697                                         }
6698                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6699                                             NULL);
6700                                 }
6701                         }
6702                 }
6703         }
6704         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6705             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6706
6707         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6708             (stcb->asoc.total_flight > 0) &&
6709             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6710                 do_chunk_output = 0;
6711         }
6712         if (do_chunk_output)
6713                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6714         else if (added_control) {
6715                 int num_out, reason, now_filled = 0;
6716                 struct timeval now;
6717                 int frag_point;
6718
6719                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6720                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6721                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6722         }
6723 no_chunk_output:
6724         if (ret) {
6725                 ca->cnt_failed++;
6726         } else {
6727                 ca->cnt_sent++;
6728         }
6729 }
6730
6731 static void
6732 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6733 {
6734         struct sctp_copy_all *ca;
6735
6736         ca = (struct sctp_copy_all *)ptr;
6737         /*
6738          * Do a notify here? Kacheong suggests that the notify be done at
6739          * the send time.. so you would push up a notification if any send
6740          * failed. Don't know if this is feasible since the only failures we
6741          * have is "memory" related and if you cannot get an mbuf to send
6742          * the data you surely can't get an mbuf to send up to notify the
6743          * user you can't send the data :->
6744          */
6745
6746         /* now free everything */
6747         if (ca->inp) {
6748                 /* Lets clear the flag to allow others to run. */
6749                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6750         }
6751         sctp_m_freem(ca->m);
6752         SCTP_FREE(ca, SCTP_M_COPYAL);
6753 }
6754
6755 static struct mbuf *
6756 sctp_copy_out_all(struct uio *uio, ssize_t len)
6757 {
6758         struct mbuf *ret, *at;
6759         ssize_t left, willcpy, cancpy, error;
6760
6761         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6762         if (ret == NULL) {
6763                 /* TSNH */
6764                 return (NULL);
6765         }
6766         left = len;
6767         SCTP_BUF_LEN(ret) = 0;
6768         /* save space for the data chunk header */
6769         cancpy = (int)M_TRAILINGSPACE(ret);
6770         willcpy = min(cancpy, left);
6771         at = ret;
6772         while (left > 0) {
6773                 /* Align data to the end */
6774                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6775                 if (error) {
6776         err_out_now:
6777                         sctp_m_freem(at);
6778                         return (NULL);
6779                 }
6780                 SCTP_BUF_LEN(at) = (int)willcpy;
6781                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6782                 left -= willcpy;
6783                 if (left > 0) {
6784                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6785                         if (SCTP_BUF_NEXT(at) == NULL) {
6786                                 goto err_out_now;
6787                         }
6788                         at = SCTP_BUF_NEXT(at);
6789                         SCTP_BUF_LEN(at) = 0;
6790                         cancpy = (int)M_TRAILINGSPACE(at);
6791                         willcpy = min(cancpy, left);
6792                 }
6793         }
6794         return (ret);
6795 }
6796
6797 static int
6798 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6799     struct sctp_sndrcvinfo *srcv)
6800 {
6801         int ret;
6802         struct sctp_copy_all *ca;
6803
6804         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6805                 /* There is another. */
6806                 return (EBUSY);
6807         }
6808         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6809                 /* You must not be larger than the limit! */
6810                 return (EMSGSIZE);
6811         }
6812         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6813             SCTP_M_COPYAL);
6814         if (ca == NULL) {
6815                 sctp_m_freem(m);
6816                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6817                 return (ENOMEM);
6818         }
6819         memset(ca, 0, sizeof(struct sctp_copy_all));
6820
6821         ca->inp = inp;
6822         if (srcv) {
6823                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6824         }
6825         /*
6826          * take off the sendall flag, it would be bad if we failed to do
6827          * this :-0
6828          */
6829         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6830         /* get length and mbuf chain */
6831         if (uio) {
6832                 ca->sndlen = uio->uio_resid;
6833                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6834                 if (ca->m == NULL) {
6835                         SCTP_FREE(ca, SCTP_M_COPYAL);
6836                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6837                         return (ENOMEM);
6838                 }
6839         } else {
6840                 /* Gather the length of the send */
6841                 struct mbuf *mat;
6842
6843                 ca->sndlen = 0;
6844                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6845                         ca->sndlen += SCTP_BUF_LEN(mat);
6846                 }
6847         }
6848         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6849         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6850             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6851             SCTP_ASOC_ANY_STATE,
6852             (void *)ca, 0,
6853             sctp_sendall_completes, inp, 1);
6854         if (ret) {
6855                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6856                 SCTP_FREE(ca, SCTP_M_COPYAL);
6857                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6858                 return (EFAULT);
6859         }
6860         return (0);
6861 }
6862
6863 void
6864 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6865 {
6866         struct sctp_tmit_chunk *chk, *nchk;
6867
6868         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6869                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6870                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6871                         asoc->ctrl_queue_cnt--;
6872                         if (chk->data) {
6873                                 sctp_m_freem(chk->data);
6874                                 chk->data = NULL;
6875                         }
6876                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6877                 }
6878         }
6879 }
6880
6881 void
6882 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6883 {
6884         struct sctp_association *asoc;
6885         struct sctp_tmit_chunk *chk, *nchk;
6886         struct sctp_asconf_chunk *acp;
6887
6888         asoc = &stcb->asoc;
6889         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6890                 /* find SCTP_ASCONF chunk in queue */
6891                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6892                         if (chk->data) {
6893                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6894                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6895                                         /* Not Acked yet */
6896                                         break;
6897                                 }
6898                         }
6899                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6900                         asoc->ctrl_queue_cnt--;
6901                         if (chk->data) {
6902                                 sctp_m_freem(chk->data);
6903                                 chk->data = NULL;
6904                         }
6905                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6906                 }
6907         }
6908 }
6909
6910 static void
6911 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6912     struct sctp_association *asoc,
6913     struct sctp_tmit_chunk **data_list,
6914     int bundle_at,
6915     struct sctp_nets *net)
6916 {
6917         int i;
6918         struct sctp_tmit_chunk *tp1;
6919
6920         for (i = 0; i < bundle_at; i++) {
6921                 /* off of the send queue */
6922                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6923                 asoc->send_queue_cnt--;
6924                 if (i > 0) {
6925                         /*
6926                          * Any chunk NOT 0 you zap the time chunk 0 gets
6927                          * zapped or set based on if a RTO measurment is
6928                          * needed.
6929                          */
6930                         data_list[i]->do_rtt = 0;
6931                 }
6932                 /* record time */
6933                 data_list[i]->sent_rcv_time = net->last_sent_time;
6934                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6935                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6936                 if (data_list[i]->whoTo == NULL) {
6937                         data_list[i]->whoTo = net;
6938                         atomic_add_int(&net->ref_count, 1);
6939                 }
6940                 /* on to the sent queue */
6941                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6942                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6943                         struct sctp_tmit_chunk *tpp;
6944
6945                         /* need to move back */
6946         back_up_more:
6947                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6948                         if (tpp == NULL) {
6949                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6950                                 goto all_done;
6951                         }
6952                         tp1 = tpp;
6953                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6954                                 goto back_up_more;
6955                         }
6956                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6957                 } else {
6958                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6959                             data_list[i],
6960                             sctp_next);
6961                 }
6962 all_done:
6963                 /* This does not lower until the cum-ack passes it */
6964                 asoc->sent_queue_cnt++;
6965                 if ((asoc->peers_rwnd <= 0) &&
6966                     (asoc->total_flight == 0) &&
6967                     (bundle_at == 1)) {
6968                         /* Mark the chunk as being a window probe */
6969                         SCTP_STAT_INCR(sctps_windowprobed);
6970                 }
6971 #ifdef SCTP_AUDITING_ENABLED
6972                 sctp_audit_log(0xC2, 3);
6973 #endif
6974                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6975                 data_list[i]->snd_count = 1;
6976                 data_list[i]->rec.data.chunk_was_revoked = 0;
6977                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6978                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6979                             data_list[i]->whoTo->flight_size,
6980                             data_list[i]->book_size,
6981                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
6982                             data_list[i]->rec.data.tsn);
6983                 }
6984                 sctp_flight_size_increase(data_list[i]);
6985                 sctp_total_flight_increase(stcb, data_list[i]);
6986                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6987                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6988                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6989                 }
6990                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6991                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6992                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6993                         /* SWS sender side engages */
6994                         asoc->peers_rwnd = 0;
6995                 }
6996         }
6997         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6998                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6999         }
7000 }
7001
7002 static void
7003 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7004 {
7005         struct sctp_tmit_chunk *chk, *nchk;
7006
7007         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7008                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7009                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7010                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7011                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7012                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7013                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7014                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7015                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7016                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7017                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7018                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7019                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7020                         /* Stray chunks must be cleaned up */
7021         clean_up_anyway:
7022                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7023                         asoc->ctrl_queue_cnt--;
7024                         if (chk->data) {
7025                                 sctp_m_freem(chk->data);
7026                                 chk->data = NULL;
7027                         }
7028                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7029                                 asoc->fwd_tsn_cnt--;
7030                         }
7031                         sctp_free_a_chunk(stcb, chk, so_locked);
7032                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7033                         /* special handling, we must look into the param */
7034                         if (chk != asoc->str_reset) {
7035                                 goto clean_up_anyway;
7036                         }
7037                 }
7038         }
7039 }
7040
7041 static uint32_t
7042 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7043     uint32_t space_left, uint32_t frag_point, int eeor_on)
7044 {
7045         /*
7046          * Make a decision on if I should split a msg into multiple parts.
7047          * This is only asked of incomplete messages.
7048          */
7049         if (eeor_on) {
7050                 /*
7051                  * If we are doing EEOR we need to always send it if its the
7052                  * entire thing, since it might be all the guy is putting in
7053                  * the hopper.
7054                  */
7055                 if (space_left >= length) {
7056                         /*-
7057                          * If we have data outstanding,
7058                          * we get another chance when the sack
7059                          * arrives to transmit - wait for more data
7060                          */
7061                         if (stcb->asoc.total_flight == 0) {
7062                                 /*
7063                                  * If nothing is in flight, we zero the
7064                                  * packet counter.
7065                                  */
7066                                 return (length);
7067                         }
7068                         return (0);
7069
7070                 } else {
7071                         /* You can fill the rest */
7072                         return (space_left);
7073                 }
7074         }
7075         /*-
7076          * For those strange folk that make the send buffer
7077          * smaller than our fragmentation point, we can't
7078          * get a full msg in so we have to allow splitting.
7079          */
7080         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7081                 return (length);
7082         }
7083         if ((length <= space_left) ||
7084             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7085                 /* Sub-optimial residual don't split in non-eeor mode. */
7086                 return (0);
7087         }
7088         /*
7089          * If we reach here length is larger than the space_left. Do we wish
7090          * to split it for the sake of packet putting together?
7091          */
7092         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7093                 /* Its ok to split it */
7094                 return (min(space_left, frag_point));
7095         }
7096         /* Nope, can't split */
7097         return (0);
7098 }
7099
7100 static uint32_t
7101 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7102     struct sctp_stream_out *strq,
7103     uint32_t space_left,
7104     uint32_t frag_point,
7105     int *giveup,
7106     int eeor_mode,
7107     int *bail,
7108     int so_locked)
7109 {
7110         /* Move from the stream to the send_queue keeping track of the total */
7111         struct sctp_association *asoc;
7112         struct sctp_stream_queue_pending *sp;
7113         struct sctp_tmit_chunk *chk;
7114         struct sctp_data_chunk *dchkh = NULL;
7115         struct sctp_idata_chunk *ndchkh = NULL;
7116         uint32_t to_move, length;
7117         int leading;
7118         uint8_t rcv_flags = 0;
7119         uint8_t some_taken;
7120         uint8_t send_lock_up = 0;
7121
7122         SCTP_TCB_LOCK_ASSERT(stcb);
7123         asoc = &stcb->asoc;
7124 one_more_time:
7125         /* sa_ignore FREED_MEMORY */
7126         sp = TAILQ_FIRST(&strq->outqueue);
7127         if (sp == NULL) {
7128                 if (send_lock_up == 0) {
7129                         SCTP_TCB_SEND_LOCK(stcb);
7130                         send_lock_up = 1;
7131                 }
7132                 sp = TAILQ_FIRST(&strq->outqueue);
7133                 if (sp) {
7134                         goto one_more_time;
7135                 }
7136                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7137                     (stcb->asoc.idata_supported == 0) &&
7138                     (strq->last_msg_incomplete)) {
7139                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7140                             strq->sid,
7141                             strq->last_msg_incomplete);
7142                         strq->last_msg_incomplete = 0;
7143                 }
7144                 to_move = 0;
7145                 if (send_lock_up) {
7146                         SCTP_TCB_SEND_UNLOCK(stcb);
7147                         send_lock_up = 0;
7148                 }
7149                 goto out_of;
7150         }
7151         if ((sp->msg_is_complete) && (sp->length == 0)) {
7152                 if (sp->sender_all_done) {
7153                         /*
7154                          * We are doing deferred cleanup. Last time through
7155                          * when we took all the data the sender_all_done was
7156                          * not set.
7157                          */
7158                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7159                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7160                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7161                                     sp->sender_all_done,
7162                                     sp->length,
7163                                     sp->msg_is_complete,
7164                                     sp->put_last_out,
7165                                     send_lock_up);
7166                         }
7167                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7168                                 SCTP_TCB_SEND_LOCK(stcb);
7169                                 send_lock_up = 1;
7170                         }
7171                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7172                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7173                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7174                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7175                             (strq->chunks_on_queues == 0) &&
7176                             TAILQ_EMPTY(&strq->outqueue)) {
7177                                 stcb->asoc.trigger_reset = 1;
7178                         }
7179                         if (sp->net) {
7180                                 sctp_free_remote_addr(sp->net);
7181                                 sp->net = NULL;
7182                         }
7183                         if (sp->data) {
7184                                 sctp_m_freem(sp->data);
7185                                 sp->data = NULL;
7186                         }
7187                         sctp_free_a_strmoq(stcb, sp, so_locked);
7188                         /* we can't be locked to it */
7189                         if (send_lock_up) {
7190                                 SCTP_TCB_SEND_UNLOCK(stcb);
7191                                 send_lock_up = 0;
7192                         }
7193                         /* back to get the next msg */
7194                         goto one_more_time;
7195                 } else {
7196                         /*
7197                          * sender just finished this but still holds a
7198                          * reference
7199                          */
7200                         *giveup = 1;
7201                         to_move = 0;
7202                         goto out_of;
7203                 }
7204         } else {
7205                 /* is there some to get */
7206                 if (sp->length == 0) {
7207                         /* no */
7208                         *giveup = 1;
7209                         to_move = 0;
7210                         goto out_of;
7211                 } else if (sp->discard_rest) {
7212                         if (send_lock_up == 0) {
7213                                 SCTP_TCB_SEND_LOCK(stcb);
7214                                 send_lock_up = 1;
7215                         }
7216                         /* Whack down the size */
7217                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7218                         if ((stcb->sctp_socket != NULL) &&
7219                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7220                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7221                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7222                         }
7223                         if (sp->data) {
7224                                 sctp_m_freem(sp->data);
7225                                 sp->data = NULL;
7226                                 sp->tail_mbuf = NULL;
7227                         }
7228                         sp->length = 0;
7229                         sp->some_taken = 1;
7230                         *giveup = 1;
7231                         to_move = 0;
7232                         goto out_of;
7233                 }
7234         }
7235         some_taken = sp->some_taken;
7236 re_look:
7237         length = sp->length;
7238         if (sp->msg_is_complete) {
7239                 /* The message is complete */
7240                 to_move = min(length, frag_point);
7241                 if (to_move == length) {
7242                         /* All of it fits in the MTU */
7243                         if (sp->some_taken) {
7244                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7245                         } else {
7246                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7247                         }
7248                         sp->put_last_out = 1;
7249                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7250                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7251                         }
7252                 } else {
7253                         /* Not all of it fits, we fragment */
7254                         if (sp->some_taken == 0) {
7255                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7256                         }
7257                         sp->some_taken = 1;
7258                 }
7259         } else {
7260                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7261                 if (to_move) {
7262                         /*-
7263                          * We use a snapshot of length in case it
7264                          * is expanding during the compare.
7265                          */
7266                         uint32_t llen;
7267
7268                         llen = length;
7269                         if (to_move >= llen) {
7270                                 to_move = llen;
7271                                 if (send_lock_up == 0) {
7272                                         /*-
7273                                          * We are taking all of an incomplete msg
7274                                          * thus we need a send lock.
7275                                          */
7276                                         SCTP_TCB_SEND_LOCK(stcb);
7277                                         send_lock_up = 1;
7278                                         if (sp->msg_is_complete) {
7279                                                 /*
7280                                                  * the sender finished the
7281                                                  * msg
7282                                                  */
7283                                                 goto re_look;
7284                                         }
7285                                 }
7286                         }
7287                         if (sp->some_taken == 0) {
7288                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7289                                 sp->some_taken = 1;
7290                         }
7291                 } else {
7292                         /* Nothing to take. */
7293                         *giveup = 1;
7294                         to_move = 0;
7295                         goto out_of;
7296                 }
7297         }
7298
7299         /* If we reach here, we can copy out a chunk */
7300         sctp_alloc_a_chunk(stcb, chk);
7301         if (chk == NULL) {
7302                 /* No chunk memory */
7303                 *giveup = 1;
7304                 to_move = 0;
7305                 goto out_of;
7306         }
7307         /*
7308          * Setup for unordered if needed by looking at the user sent info
7309          * flags.
7310          */
7311         if (sp->sinfo_flags & SCTP_UNORDERED) {
7312                 rcv_flags |= SCTP_DATA_UNORDERED;
7313         }
7314         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7315             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7316                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7317         }
7318         /* clear out the chunk before setting up */
7319         memset(chk, 0, sizeof(*chk));
7320         chk->rec.data.rcv_flags = rcv_flags;
7321
7322         if (to_move >= length) {
7323                 /* we think we can steal the whole thing */
7324                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7325                         SCTP_TCB_SEND_LOCK(stcb);
7326                         send_lock_up = 1;
7327                 }
7328                 if (to_move < sp->length) {
7329                         /* bail, it changed */
7330                         goto dont_do_it;
7331                 }
7332                 chk->data = sp->data;
7333                 chk->last_mbuf = sp->tail_mbuf;
7334                 /* register the stealing */
7335                 sp->data = sp->tail_mbuf = NULL;
7336         } else {
7337                 struct mbuf *m;
7338
7339 dont_do_it:
7340                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7341                 chk->last_mbuf = NULL;
7342                 if (chk->data == NULL) {
7343                         sp->some_taken = some_taken;
7344                         sctp_free_a_chunk(stcb, chk, so_locked);
7345                         *bail = 1;
7346                         to_move = 0;
7347                         goto out_of;
7348                 }
7349 #ifdef SCTP_MBUF_LOGGING
7350                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7351                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7352                 }
7353 #endif
7354                 /* Pull off the data */
7355                 m_adj(sp->data, to_move);
7356                 /* Now lets work our way down and compact it */
7357                 m = sp->data;
7358                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7359                         sp->data = SCTP_BUF_NEXT(m);
7360                         SCTP_BUF_NEXT(m) = NULL;
7361                         if (sp->tail_mbuf == m) {
7362                                 /*-
7363                                  * Freeing tail? TSNH since
7364                                  * we supposedly were taking less
7365                                  * than the sp->length.
7366                                  */
7367 #ifdef INVARIANTS
7368                                 panic("Huh, freing tail? - TSNH");
7369 #else
7370                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7371                                 sp->tail_mbuf = sp->data = NULL;
7372                                 sp->length = 0;
7373 #endif
7374                         }
7375                         sctp_m_free(m);
7376                         m = sp->data;
7377                 }
7378         }
7379         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7380                 chk->copy_by_ref = 1;
7381         } else {
7382                 chk->copy_by_ref = 0;
7383         }
7384         /*
7385          * get last_mbuf and counts of mb usage This is ugly but hopefully
7386          * its only one mbuf.
7387          */
7388         if (chk->last_mbuf == NULL) {
7389                 chk->last_mbuf = chk->data;
7390                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7391                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7392                 }
7393         }
7394
7395         if (to_move > length) {
7396                 /*- This should not happen either
7397                  * since we always lower to_move to the size
7398                  * of sp->length if its larger.
7399                  */
7400 #ifdef INVARIANTS
7401                 panic("Huh, how can to_move be larger?");
7402 #else
7403                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7404                 sp->length = 0;
7405 #endif
7406         } else {
7407                 atomic_subtract_int(&sp->length, to_move);
7408         }
7409         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7410         if (M_LEADINGSPACE(chk->data) < leading) {
7411                 /* Not enough room for a chunk header, get some */
7412                 struct mbuf *m;
7413
7414                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7415                 if (m == NULL) {
7416                         /*
7417                          * we're in trouble here. _PREPEND below will free
7418                          * all the data if there is no leading space, so we
7419                          * must put the data back and restore.
7420                          */
7421                         if (send_lock_up == 0) {
7422                                 SCTP_TCB_SEND_LOCK(stcb);
7423                                 send_lock_up = 1;
7424                         }
7425                         if (sp->data == NULL) {
7426                                 /* unsteal the data */
7427                                 sp->data = chk->data;
7428                                 sp->tail_mbuf = chk->last_mbuf;
7429                         } else {
7430                                 struct mbuf *m_tmp;
7431
7432                                 /* reassemble the data */
7433                                 m_tmp = sp->data;
7434                                 sp->data = chk->data;
7435                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7436                         }
7437                         sp->some_taken = some_taken;
7438                         atomic_add_int(&sp->length, to_move);
7439                         chk->data = NULL;
7440                         *bail = 1;
7441                         sctp_free_a_chunk(stcb, chk, so_locked);
7442                         to_move = 0;
7443                         goto out_of;
7444                 } else {
7445                         SCTP_BUF_LEN(m) = 0;
7446                         SCTP_BUF_NEXT(m) = chk->data;
7447                         chk->data = m;
7448                         M_ALIGN(chk->data, 4);
7449                 }
7450         }
7451         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7452         if (chk->data == NULL) {
7453                 /* HELP, TSNH since we assured it would not above? */
7454 #ifdef INVARIANTS
7455                 panic("prepend failes HELP?");
7456 #else
7457                 SCTP_PRINTF("prepend fails HELP?\n");
7458                 sctp_free_a_chunk(stcb, chk, so_locked);
7459 #endif
7460                 *bail = 1;
7461                 to_move = 0;
7462                 goto out_of;
7463         }
7464         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7465         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7466         chk->book_size_scale = 0;
7467         chk->sent = SCTP_DATAGRAM_UNSENT;
7468
7469         chk->flags = 0;
7470         chk->asoc = &stcb->asoc;
7471         chk->pad_inplace = 0;
7472         chk->no_fr_allowed = 0;
7473         if (stcb->asoc.idata_supported == 0) {
7474                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7475                         /* Just use 0. The receiver ignores the values. */
7476                         chk->rec.data.mid = 0;
7477                 } else {
7478                         chk->rec.data.mid = strq->next_mid_ordered;
7479                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7480                                 strq->next_mid_ordered++;
7481                         }
7482                 }
7483         } else {
7484                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7485                         chk->rec.data.mid = strq->next_mid_unordered;
7486                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7487                                 strq->next_mid_unordered++;
7488                         }
7489                 } else {
7490                         chk->rec.data.mid = strq->next_mid_ordered;
7491                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7492                                 strq->next_mid_ordered++;
7493                         }
7494                 }
7495         }
7496         chk->rec.data.sid = sp->sid;
7497         chk->rec.data.ppid = sp->ppid;
7498         chk->rec.data.context = sp->context;
7499         chk->rec.data.doing_fast_retransmit = 0;
7500
7501         chk->rec.data.timetodrop = sp->ts;
7502         chk->flags = sp->act_flags;
7503
7504         if (sp->net) {
7505                 chk->whoTo = sp->net;
7506                 atomic_add_int(&chk->whoTo->ref_count, 1);
7507         } else
7508                 chk->whoTo = NULL;
7509
7510         if (sp->holds_key_ref) {
7511                 chk->auth_keyid = sp->auth_keyid;
7512                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7513                 chk->holds_key_ref = 1;
7514         }
7515         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7516         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7517                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7518                     (uint32_t)(uintptr_t)stcb, sp->length,
7519                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7520                     chk->rec.data.tsn);
7521         }
7522         if (stcb->asoc.idata_supported == 0) {
7523                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7524         } else {
7525                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7526         }
7527         /*
7528          * Put the rest of the things in place now. Size was done earlier in
7529          * previous loop prior to padding.
7530          */
7531
7532 #ifdef SCTP_ASOCLOG_OF_TSNS
7533         SCTP_TCB_LOCK_ASSERT(stcb);
7534         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7535                 asoc->tsn_out_at = 0;
7536                 asoc->tsn_out_wrapped = 1;
7537         }
7538         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7539         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7540         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7541         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7542         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7543         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7544         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7545         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7546         asoc->tsn_out_at++;
7547 #endif
7548         if (stcb->asoc.idata_supported == 0) {
7549                 dchkh->ch.chunk_type = SCTP_DATA;
7550                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7551                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7552                 dchkh->dp.sid = htons(strq->sid);
7553                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7554                 dchkh->dp.ppid = chk->rec.data.ppid;
7555                 dchkh->ch.chunk_length = htons(chk->send_size);
7556         } else {
7557                 ndchkh->ch.chunk_type = SCTP_IDATA;
7558                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7559                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7560                 ndchkh->dp.sid = htons(strq->sid);
7561                 ndchkh->dp.reserved = htons(0);
7562                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7563                 if (sp->fsn == 0)
7564                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7565                 else
7566                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7567                 sp->fsn++;
7568                 ndchkh->ch.chunk_length = htons(chk->send_size);
7569         }
7570         /* Now advance the chk->send_size by the actual pad needed. */
7571         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7572                 /* need a pad */
7573                 struct mbuf *lm;
7574                 int pads;
7575
7576                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7577                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7578                 if (lm != NULL) {
7579                         chk->last_mbuf = lm;
7580                         chk->pad_inplace = 1;
7581                 }
7582                 chk->send_size += pads;
7583         }
7584         if (PR_SCTP_ENABLED(chk->flags)) {
7585                 asoc->pr_sctp_cnt++;
7586         }
7587         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7588                 /* All done pull and kill the message */
7589                 if (sp->put_last_out == 0) {
7590                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7591                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7592                             sp->sender_all_done,
7593                             sp->length,
7594                             sp->msg_is_complete,
7595                             sp->put_last_out,
7596                             send_lock_up);
7597                 }
7598                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7599                         SCTP_TCB_SEND_LOCK(stcb);
7600                         send_lock_up = 1;
7601                 }
7602                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7603                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7604                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7605                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7606                     (strq->chunks_on_queues == 0) &&
7607                     TAILQ_EMPTY(&strq->outqueue)) {
7608                         stcb->asoc.trigger_reset = 1;
7609                 }
7610                 if (sp->net) {
7611                         sctp_free_remote_addr(sp->net);
7612                         sp->net = NULL;
7613                 }
7614                 if (sp->data) {
7615                         sctp_m_freem(sp->data);
7616                         sp->data = NULL;
7617                 }
7618                 sctp_free_a_strmoq(stcb, sp, so_locked);
7619         }
7620         asoc->chunks_on_out_queue++;
7621         strq->chunks_on_queues++;
7622         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7623         asoc->send_queue_cnt++;
7624 out_of:
7625         if (send_lock_up) {
7626                 SCTP_TCB_SEND_UNLOCK(stcb);
7627         }
7628         return (to_move);
7629 }
7630
7631 static void
7632 sctp_fill_outqueue(struct sctp_tcb *stcb,
7633     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked)
7634 {
7635         struct sctp_association *asoc;
7636         struct sctp_stream_out *strq;
7637         uint32_t space_left, moved, total_moved;
7638         int bail, giveup;
7639
7640         SCTP_TCB_LOCK_ASSERT(stcb);
7641         asoc = &stcb->asoc;
7642         total_moved = 0;
7643         switch (net->ro._l_addr.sa.sa_family) {
7644 #ifdef INET
7645         case AF_INET:
7646                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7647                 break;
7648 #endif
7649 #ifdef INET6
7650         case AF_INET6:
7651                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7652                 break;
7653 #endif
7654         default:
7655                 /* TSNH */
7656                 space_left = net->mtu;
7657                 break;
7658         }
7659         /* Need an allowance for the data chunk header too */
7660         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7661
7662         /* must make even word boundary */
7663         space_left &= 0xfffffffc;
7664         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7665         giveup = 0;
7666         bail = 0;
7667         while ((space_left > 0) && (strq != NULL)) {
7668                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7669                     &giveup, eeor_mode, &bail, so_locked);
7670                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7671                 if ((giveup != 0) || (bail != 0)) {
7672                         break;
7673                 }
7674                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7675                 total_moved += moved;
7676                 if (space_left >= moved) {
7677                         space_left -= moved;
7678                 } else {
7679                         space_left = 0;
7680                 }
7681                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7682                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7683                 } else {
7684                         space_left = 0;
7685                 }
7686                 space_left &= 0xfffffffc;
7687         }
7688         if (bail != 0)
7689                 *quit_now = 1;
7690
7691         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7692
7693         if (total_moved == 0) {
7694                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7695                     (net == stcb->asoc.primary_destination)) {
7696                         /* ran dry for primary network net */
7697                         SCTP_STAT_INCR(sctps_primary_randry);
7698                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7699                         /* ran dry with CMT on */
7700                         SCTP_STAT_INCR(sctps_cmt_randry);
7701                 }
7702         }
7703 }
7704
7705 void
7706 sctp_fix_ecn_echo(struct sctp_association *asoc)
7707 {
7708         struct sctp_tmit_chunk *chk;
7709
7710         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7711                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7712                         chk->sent = SCTP_DATAGRAM_UNSENT;
7713                 }
7714         }
7715 }
7716
7717 void
7718 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7719 {
7720         struct sctp_association *asoc;
7721         struct sctp_tmit_chunk *chk;
7722         struct sctp_stream_queue_pending *sp;
7723         unsigned int i;
7724
7725         if (net == NULL) {
7726                 return;
7727         }
7728         asoc = &stcb->asoc;
7729         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7730                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7731                         if (sp->net == net) {
7732                                 sctp_free_remote_addr(sp->net);
7733                                 sp->net = NULL;
7734                         }
7735                 }
7736         }
7737         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7738                 if (chk->whoTo == net) {
7739                         sctp_free_remote_addr(chk->whoTo);
7740                         chk->whoTo = NULL;
7741                 }
7742         }
7743 }
7744
7745 int
7746 sctp_med_chunk_output(struct sctp_inpcb *inp,
7747     struct sctp_tcb *stcb,
7748     struct sctp_association *asoc,
7749     int *num_out,
7750     int *reason_code,
7751     int control_only, int from_where,
7752     struct timeval *now, int *now_filled, int frag_point, int so_locked)
7753 {
7754         /**
7755          * Ok this is the generic chunk service queue. we must do the
7756          * following:
7757          * - Service the stream queue that is next, moving any
7758          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7759          *   LAST to the out queue in one pass) and assigning TSN's. This
7760          *   only applys though if the peer does not support NDATA. For NDATA
7761          *   chunks its ok to not send the entire message ;-)
7762          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7763          *   fomulate and send the low level chunks. Making sure to combine
7764          *   any control in the control chunk queue also.
7765          */
7766         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7767         struct mbuf *outchain, *endoutchain;
7768         struct sctp_tmit_chunk *chk, *nchk;
7769
7770         /* temp arrays for unlinking */
7771         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7772         int no_fragmentflg, error;
7773         unsigned int max_rwnd_per_dest, max_send_per_dest;
7774         int one_chunk, hbflag, skip_data_for_this_net;
7775         int asconf, cookie, no_out_cnt;
7776         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7777         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7778         int tsns_sent = 0;
7779         uint32_t auth_offset;
7780         struct sctp_auth_chunk *auth;
7781         uint16_t auth_keyid;
7782         int override_ok = 1;
7783         int skip_fill_up = 0;
7784         int data_auth_reqd = 0;
7785
7786         /*
7787          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7788          * destination.
7789          */
7790         int quit_now = 0;
7791
7792         *num_out = 0;
7793         *reason_code = 0;
7794         auth_keyid = stcb->asoc.authinfo.active_keyid;
7795         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7796             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7797             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7798                 eeor_mode = 1;
7799         } else {
7800                 eeor_mode = 0;
7801         }
7802         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7803         /*
7804          * First lets prime the pump. For each destination, if there is room
7805          * in the flight size, attempt to pull an MTU's worth out of the
7806          * stream queues into the general send_queue
7807          */
7808 #ifdef SCTP_AUDITING_ENABLED
7809         sctp_audit_log(0xC2, 2);
7810 #endif
7811         SCTP_TCB_LOCK_ASSERT(stcb);
7812         hbflag = 0;
7813         if (control_only)
7814                 no_data_chunks = 1;
7815         else
7816                 no_data_chunks = 0;
7817
7818         /* Nothing to possible to send? */
7819         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7820             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7821             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7822             TAILQ_EMPTY(&asoc->send_queue) &&
7823             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7824 nothing_to_send:
7825                 *reason_code = 9;
7826                 return (0);
7827         }
7828         if (asoc->peers_rwnd == 0) {
7829                 /* No room in peers rwnd */
7830                 *reason_code = 1;
7831                 if (asoc->total_flight > 0) {
7832                         /* we are allowed one chunk in flight */
7833                         no_data_chunks = 1;
7834                 }
7835         }
7836         if (stcb->asoc.ecn_echo_cnt_onq) {
7837                 /* Record where a sack goes, if any */
7838                 if (no_data_chunks &&
7839                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7840                         /* Nothing but ECNe to send - we don't do that */
7841                         goto nothing_to_send;
7842                 }
7843                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7844                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7845                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7846                                 sack_goes_to = chk->whoTo;
7847                                 break;
7848                         }
7849                 }
7850         }
7851         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7852         if (stcb->sctp_socket)
7853                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7854         else
7855                 max_send_per_dest = 0;
7856         if (no_data_chunks == 0) {
7857                 /* How many non-directed chunks are there? */
7858                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7859                         if (chk->whoTo == NULL) {
7860                                 /*
7861                                  * We already have non-directed chunks on
7862                                  * the queue, no need to do a fill-up.
7863                                  */
7864                                 skip_fill_up = 1;
7865                                 break;
7866                         }
7867                 }
7868         }
7869         if ((no_data_chunks == 0) &&
7870             (skip_fill_up == 0) &&
7871             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7872                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7873                         /*
7874                          * This for loop we are in takes in each net, if
7875                          * its's got space in cwnd and has data sent to it
7876                          * (when CMT is off) then it calls
7877                          * sctp_fill_outqueue for the net. This gets data on
7878                          * the send queue for that network.
7879                          *
7880                          * In sctp_fill_outqueue TSN's are assigned and data
7881                          * is copied out of the stream buffers. Note mostly
7882                          * copy by reference (we hope).
7883                          */
7884                         net->window_probe = 0;
7885                         if ((net != stcb->asoc.alternate) &&
7886                             ((net->dest_state & SCTP_ADDR_PF) ||
7887                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7888                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7889                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7890                                         sctp_log_cwnd(stcb, net, 1,
7891                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7892                                 }
7893                                 continue;
7894                         }
7895                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7896                             (net->flight_size == 0)) {
7897                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7898                         }
7899                         if (net->flight_size >= net->cwnd) {
7900                                 /* skip this network, no room - can't fill */
7901                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7902                                         sctp_log_cwnd(stcb, net, 3,
7903                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7904                                 }
7905                                 continue;
7906                         }
7907                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7908                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7909                         }
7910                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7911                         if (quit_now) {
7912                                 /* memory alloc failure */
7913                                 no_data_chunks = 1;
7914                                 break;
7915                         }
7916                 }
7917         }
7918         /* now service each destination and send out what we can for it */
7919         /* Nothing to send? */
7920         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7921             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7922             TAILQ_EMPTY(&asoc->send_queue)) {
7923                 *reason_code = 8;
7924                 return (0);
7925         }
7926
7927         if (asoc->sctp_cmt_on_off > 0) {
7928                 /* get the last start point */
7929                 start_at = asoc->last_net_cmt_send_started;
7930                 if (start_at == NULL) {
7931                         /* null so to beginning */
7932                         start_at = TAILQ_FIRST(&asoc->nets);
7933                 } else {
7934                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7935                         if (start_at == NULL) {
7936                                 start_at = TAILQ_FIRST(&asoc->nets);
7937                         }
7938                 }
7939                 asoc->last_net_cmt_send_started = start_at;
7940         } else {
7941                 start_at = TAILQ_FIRST(&asoc->nets);
7942         }
7943         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7944                 if (chk->whoTo == NULL) {
7945                         if (asoc->alternate) {
7946                                 chk->whoTo = asoc->alternate;
7947                         } else {
7948                                 chk->whoTo = asoc->primary_destination;
7949                         }
7950                         atomic_add_int(&chk->whoTo->ref_count, 1);
7951                 }
7952         }
7953         old_start_at = NULL;
7954 again_one_more_time:
7955         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7956                 /* how much can we send? */
7957                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7958                 if (old_start_at && (old_start_at == net)) {
7959                         /* through list ocmpletely. */
7960                         break;
7961                 }
7962                 tsns_sent = 0xa;
7963                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7964                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7965                     (net->flight_size >= net->cwnd)) {
7966                         /*
7967                          * Nothing on control or asconf and flight is full,
7968                          * we can skip even in the CMT case.
7969                          */
7970                         continue;
7971                 }
7972                 bundle_at = 0;
7973                 endoutchain = outchain = NULL;
7974                 auth = NULL;
7975                 auth_offset = 0;
7976                 no_fragmentflg = 1;
7977                 one_chunk = 0;
7978                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7979                         skip_data_for_this_net = 1;
7980                 } else {
7981                         skip_data_for_this_net = 0;
7982                 }
7983                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7984 #ifdef INET
7985                 case AF_INET:
7986                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7987                         break;
7988 #endif
7989 #ifdef INET6
7990                 case AF_INET6:
7991                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
7992                         break;
7993 #endif
7994                 default:
7995                         /* TSNH */
7996                         mtu = net->mtu;
7997                         break;
7998                 }
7999                 mx_mtu = mtu;
8000                 to_out = 0;
8001                 if (mtu > asoc->peers_rwnd) {
8002                         if (asoc->total_flight > 0) {
8003                                 /* We have a packet in flight somewhere */
8004                                 r_mtu = asoc->peers_rwnd;
8005                         } else {
8006                                 /* We are always allowed to send one MTU out */
8007                                 one_chunk = 1;
8008                                 r_mtu = mtu;
8009                         }
8010                 } else {
8011                         r_mtu = mtu;
8012                 }
8013                 error = 0;
8014                 /************************/
8015                 /* ASCONF transmission */
8016                 /************************/
8017                 /* Now first lets go through the asconf queue */
8018                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8019                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8020                                 continue;
8021                         }
8022                         if (chk->whoTo == NULL) {
8023                                 if (asoc->alternate == NULL) {
8024                                         if (asoc->primary_destination != net) {
8025                                                 break;
8026                                         }
8027                                 } else {
8028                                         if (asoc->alternate != net) {
8029                                                 break;
8030                                         }
8031                                 }
8032                         } else {
8033                                 if (chk->whoTo != net) {
8034                                         break;
8035                                 }
8036                         }
8037                         if (chk->data == NULL) {
8038                                 break;
8039                         }
8040                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8041                             chk->sent != SCTP_DATAGRAM_RESEND) {
8042                                 break;
8043                         }
8044                         /*
8045                          * if no AUTH is yet included and this chunk
8046                          * requires it, make sure to account for it.  We
8047                          * don't apply the size until the AUTH chunk is
8048                          * actually added below in case there is no room for
8049                          * this chunk. NOTE: we overload the use of "omtu"
8050                          * here
8051                          */
8052                         if ((auth == NULL) &&
8053                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8054                             stcb->asoc.peer_auth_chunks)) {
8055                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8056                         } else
8057                                 omtu = 0;
8058                         /* Here we do NOT factor the r_mtu */
8059                         if ((chk->send_size < (int)(mtu - omtu)) ||
8060                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8061                                 /*
8062                                  * We probably should glom the mbuf chain
8063                                  * from the chk->data for control but the
8064                                  * problem is it becomes yet one more level
8065                                  * of tracking to do if for some reason
8066                                  * output fails. Then I have got to
8067                                  * reconstruct the merged control chain.. el
8068                                  * yucko.. for now we take the easy way and
8069                                  * do the copy
8070                                  */
8071                                 /*
8072                                  * Add an AUTH chunk, if chunk requires it
8073                                  * save the offset into the chain for AUTH
8074                                  */
8075                                 if ((auth == NULL) &&
8076                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8077                                     stcb->asoc.peer_auth_chunks))) {
8078                                         outchain = sctp_add_auth_chunk(outchain,
8079                                             &endoutchain,
8080                                             &auth,
8081                                             &auth_offset,
8082                                             stcb,
8083                                             chk->rec.chunk_id.id);
8084                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8085                                 }
8086                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8087                                     (int)chk->rec.chunk_id.can_take_data,
8088                                     chk->send_size, chk->copy_by_ref);
8089                                 if (outchain == NULL) {
8090                                         *reason_code = 8;
8091                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8092                                         return (ENOMEM);
8093                                 }
8094                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8095                                 /* update our MTU size */
8096                                 if (mtu > (chk->send_size + omtu))
8097                                         mtu -= (chk->send_size + omtu);
8098                                 else
8099                                         mtu = 0;
8100                                 to_out += (chk->send_size + omtu);
8101                                 /* Do clear IP_DF ? */
8102                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8103                                         no_fragmentflg = 0;
8104                                 }
8105                                 if (chk->rec.chunk_id.can_take_data)
8106                                         chk->data = NULL;
8107                                 /*
8108                                  * set hb flag since we can use these for
8109                                  * RTO
8110                                  */
8111                                 hbflag = 1;
8112                                 asconf = 1;
8113                                 /*
8114                                  * should sysctl this: don't bundle data
8115                                  * with ASCONF since it requires AUTH
8116                                  */
8117                                 no_data_chunks = 1;
8118                                 chk->sent = SCTP_DATAGRAM_SENT;
8119                                 if (chk->whoTo == NULL) {
8120                                         chk->whoTo = net;
8121                                         atomic_add_int(&net->ref_count, 1);
8122                                 }
8123                                 chk->snd_count++;
8124                                 if (mtu == 0) {
8125                                         /*
8126                                          * Ok we are out of room but we can
8127                                          * output without effecting the
8128                                          * flight size since this little guy
8129                                          * is a control only packet.
8130                                          */
8131                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8132                                         /*
8133                                          * do NOT clear the asconf flag as
8134                                          * it is used to do appropriate
8135                                          * source address selection.
8136                                          */
8137                                         if (*now_filled == 0) {
8138                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8139                                                 *now_filled = 1;
8140                                         }
8141                                         net->last_sent_time = *now;
8142                                         hbflag = 0;
8143                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8144                                             (struct sockaddr *)&net->ro._l_addr,
8145                                             outchain, auth_offset, auth,
8146                                             stcb->asoc.authinfo.active_keyid,
8147                                             no_fragmentflg, 0, asconf,
8148                                             inp->sctp_lport, stcb->rport,
8149                                             htonl(stcb->asoc.peer_vtag),
8150                                             net->port, NULL,
8151                                             0, 0,
8152                                             so_locked))) {
8153                                                 /*
8154                                                  * error, we could not
8155                                                  * output
8156                                                  */
8157                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8158                                                 if (from_where == 0) {
8159                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8160                                                 }
8161                                                 if (error == ENOBUFS) {
8162                                                         asoc->ifp_had_enobuf = 1;
8163                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8164                                                 }
8165                                                 /* error, could not output */
8166                                                 if (error == EHOSTUNREACH) {
8167                                                         /*
8168                                                          * Destination went
8169                                                          * unreachable
8170                                                          * during this send
8171                                                          */
8172                                                         sctp_move_chunks_from_net(stcb, net);
8173                                                 }
8174                                                 *reason_code = 7;
8175                                                 break;
8176                                         } else {
8177                                                 asoc->ifp_had_enobuf = 0;
8178                                         }
8179                                         /*
8180                                          * increase the number we sent, if a
8181                                          * cookie is sent we don't tell them
8182                                          * any was sent out.
8183                                          */
8184                                         outchain = endoutchain = NULL;
8185                                         auth = NULL;
8186                                         auth_offset = 0;
8187                                         if (!no_out_cnt)
8188                                                 *num_out += ctl_cnt;
8189                                         /* recalc a clean slate and setup */
8190                                         switch (net->ro._l_addr.sa.sa_family) {
8191 #ifdef INET
8192                                         case AF_INET:
8193                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8194                                                 break;
8195 #endif
8196 #ifdef INET6
8197                                         case AF_INET6:
8198                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8199                                                 break;
8200 #endif
8201                                         default:
8202                                                 /* TSNH */
8203                                                 mtu = net->mtu;
8204                                                 break;
8205                                         }
8206                                         to_out = 0;
8207                                         no_fragmentflg = 1;
8208                                 }
8209                         }
8210                 }
8211                 if (error != 0) {
8212                         /* try next net */
8213                         continue;
8214                 }
8215                 /************************/
8216                 /* Control transmission */
8217                 /************************/
8218                 /* Now first lets go through the control queue */
8219                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8220                         if ((sack_goes_to) &&
8221                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8222                             (chk->whoTo != sack_goes_to)) {
8223                                 /*
8224                                  * if we have a sack in queue, and we are
8225                                  * looking at an ecn echo that is NOT queued
8226                                  * to where the sack is going..
8227                                  */
8228                                 if (chk->whoTo == net) {
8229                                         /*
8230                                          * Don't transmit it to where its
8231                                          * going (current net)
8232                                          */
8233                                         continue;
8234                                 } else if (sack_goes_to == net) {
8235                                         /*
8236                                          * But do transmit it to this
8237                                          * address
8238                                          */
8239                                         goto skip_net_check;
8240                                 }
8241                         }
8242                         if (chk->whoTo == NULL) {
8243                                 if (asoc->alternate == NULL) {
8244                                         if (asoc->primary_destination != net) {
8245                                                 continue;
8246                                         }
8247                                 } else {
8248                                         if (asoc->alternate != net) {
8249                                                 continue;
8250                                         }
8251                                 }
8252                         } else {
8253                                 if (chk->whoTo != net) {
8254                                         continue;
8255                                 }
8256                         }
8257         skip_net_check:
8258                         if (chk->data == NULL) {
8259                                 continue;
8260                         }
8261                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8262                                 /*
8263                                  * It must be unsent. Cookies and ASCONF's
8264                                  * hang around but there timers will force
8265                                  * when marked for resend.
8266                                  */
8267                                 continue;
8268                         }
8269                         /*
8270                          * if no AUTH is yet included and this chunk
8271                          * requires it, make sure to account for it.  We
8272                          * don't apply the size until the AUTH chunk is
8273                          * actually added below in case there is no room for
8274                          * this chunk. NOTE: we overload the use of "omtu"
8275                          * here
8276                          */
8277                         if ((auth == NULL) &&
8278                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8279                             stcb->asoc.peer_auth_chunks)) {
8280                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8281                         } else
8282                                 omtu = 0;
8283                         /* Here we do NOT factor the r_mtu */
8284                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8285                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8286                                 /*
8287                                  * We probably should glom the mbuf chain
8288                                  * from the chk->data for control but the
8289                                  * problem is it becomes yet one more level
8290                                  * of tracking to do if for some reason
8291                                  * output fails. Then I have got to
8292                                  * reconstruct the merged control chain.. el
8293                                  * yucko.. for now we take the easy way and
8294                                  * do the copy
8295                                  */
8296                                 /*
8297                                  * Add an AUTH chunk, if chunk requires it
8298                                  * save the offset into the chain for AUTH
8299                                  */
8300                                 if ((auth == NULL) &&
8301                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8302                                     stcb->asoc.peer_auth_chunks))) {
8303                                         outchain = sctp_add_auth_chunk(outchain,
8304                                             &endoutchain,
8305                                             &auth,
8306                                             &auth_offset,
8307                                             stcb,
8308                                             chk->rec.chunk_id.id);
8309                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8310                                 }
8311                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8312                                     (int)chk->rec.chunk_id.can_take_data,
8313                                     chk->send_size, chk->copy_by_ref);
8314                                 if (outchain == NULL) {
8315                                         *reason_code = 8;
8316                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8317                                         return (ENOMEM);
8318                                 }
8319                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8320                                 /* update our MTU size */
8321                                 if (mtu > (chk->send_size + omtu))
8322                                         mtu -= (chk->send_size + omtu);
8323                                 else
8324                                         mtu = 0;
8325                                 to_out += (chk->send_size + omtu);
8326                                 /* Do clear IP_DF ? */
8327                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8328                                         no_fragmentflg = 0;
8329                                 }
8330                                 if (chk->rec.chunk_id.can_take_data)
8331                                         chk->data = NULL;
8332                                 /* Mark things to be removed, if needed */
8333                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8334                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8335                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8336                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8337                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8338                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8339                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8340                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8341                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8342                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8343                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8344                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8345                                                 hbflag = 1;
8346                                         }
8347                                         /* remove these chunks at the end */
8348                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8349                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8350                                                 /* turn off the timer */
8351                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8352                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8353                                                             inp, stcb, NULL,
8354                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8355                                                 }
8356                                         }
8357                                         ctl_cnt++;
8358                                 } else {
8359                                         /*
8360                                          * Other chunks, since they have
8361                                          * timers running (i.e. COOKIE) we
8362                                          * just "trust" that it gets sent or
8363                                          * retransmitted.
8364                                          */
8365                                         ctl_cnt++;
8366                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8367                                                 cookie = 1;
8368                                                 no_out_cnt = 1;
8369                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8370                                                 /*
8371                                                  * Increment ecne send count
8372                                                  * here this means we may be
8373                                                  * over-zealous in our
8374                                                  * counting if the send
8375                                                  * fails, but its the best
8376                                                  * place to do it (we used
8377                                                  * to do it in the queue of
8378                                                  * the chunk, but that did
8379                                                  * not tell how many times
8380                                                  * it was sent.
8381                                                  */
8382                                                 SCTP_STAT_INCR(sctps_sendecne);
8383                                         }
8384                                         chk->sent = SCTP_DATAGRAM_SENT;
8385                                         if (chk->whoTo == NULL) {
8386                                                 chk->whoTo = net;
8387                                                 atomic_add_int(&net->ref_count, 1);
8388                                         }
8389                                         chk->snd_count++;
8390                                 }
8391                                 if (mtu == 0) {
8392                                         /*
8393                                          * Ok we are out of room but we can
8394                                          * output without effecting the
8395                                          * flight size since this little guy
8396                                          * is a control only packet.
8397                                          */
8398                                         if (asconf) {
8399                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8400                                                 /*
8401                                                  * do NOT clear the asconf
8402                                                  * flag as it is used to do
8403                                                  * appropriate source
8404                                                  * address selection.
8405                                                  */
8406                                         }
8407                                         if (cookie) {
8408                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8409                                                 cookie = 0;
8410                                         }
8411                                         /* Only HB or ASCONF advances time */
8412                                         if (hbflag) {
8413                                                 if (*now_filled == 0) {
8414                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8415                                                         *now_filled = 1;
8416                                                 }
8417                                                 net->last_sent_time = *now;
8418                                                 hbflag = 0;
8419                                         }
8420                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8421                                             (struct sockaddr *)&net->ro._l_addr,
8422                                             outchain,
8423                                             auth_offset, auth,
8424                                             stcb->asoc.authinfo.active_keyid,
8425                                             no_fragmentflg, 0, asconf,
8426                                             inp->sctp_lport, stcb->rport,
8427                                             htonl(stcb->asoc.peer_vtag),
8428                                             net->port, NULL,
8429                                             0, 0,
8430                                             so_locked))) {
8431                                                 /*
8432                                                  * error, we could not
8433                                                  * output
8434                                                  */
8435                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8436                                                 if (from_where == 0) {
8437                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8438                                                 }
8439                                                 if (error == ENOBUFS) {
8440                                                         asoc->ifp_had_enobuf = 1;
8441                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8442                                                 }
8443                                                 if (error == EHOSTUNREACH) {
8444                                                         /*
8445                                                          * Destination went
8446                                                          * unreachable
8447                                                          * during this send
8448                                                          */
8449                                                         sctp_move_chunks_from_net(stcb, net);
8450                                                 }
8451                                                 *reason_code = 7;
8452                                                 break;
8453                                         } else {
8454                                                 asoc->ifp_had_enobuf = 0;
8455                                         }
8456                                         /*
8457                                          * increase the number we sent, if a
8458                                          * cookie is sent we don't tell them
8459                                          * any was sent out.
8460                                          */
8461                                         outchain = endoutchain = NULL;
8462                                         auth = NULL;
8463                                         auth_offset = 0;
8464                                         if (!no_out_cnt)
8465                                                 *num_out += ctl_cnt;
8466                                         /* recalc a clean slate and setup */
8467                                         switch (net->ro._l_addr.sa.sa_family) {
8468 #ifdef INET
8469                                         case AF_INET:
8470                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8471                                                 break;
8472 #endif
8473 #ifdef INET6
8474                                         case AF_INET6:
8475                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8476                                                 break;
8477 #endif
8478                                         default:
8479                                                 /* TSNH */
8480                                                 mtu = net->mtu;
8481                                                 break;
8482                                         }
8483                                         to_out = 0;
8484                                         no_fragmentflg = 1;
8485                                 }
8486                         }
8487                 }
8488                 if (error != 0) {
8489                         /* try next net */
8490                         continue;
8491                 }
8492                 /* JRI: if dest is in PF state, do not send data to it */
8493                 if ((asoc->sctp_cmt_on_off > 0) &&
8494                     (net != stcb->asoc.alternate) &&
8495                     (net->dest_state & SCTP_ADDR_PF)) {
8496                         goto no_data_fill;
8497                 }
8498                 if (net->flight_size >= net->cwnd) {
8499                         goto no_data_fill;
8500                 }
8501                 if ((asoc->sctp_cmt_on_off > 0) &&
8502                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8503                     (net->flight_size > max_rwnd_per_dest)) {
8504                         goto no_data_fill;
8505                 }
8506                 /*
8507                  * We need a specific accounting for the usage of the send
8508                  * buffer. We also need to check the number of messages per
8509                  * net. For now, this is better than nothing and it disabled
8510                  * by default...
8511                  */
8512                 if ((asoc->sctp_cmt_on_off > 0) &&
8513                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8514                     (max_send_per_dest > 0) &&
8515                     (net->flight_size > max_send_per_dest)) {
8516                         goto no_data_fill;
8517                 }
8518                 /*********************/
8519                 /* Data transmission */
8520                 /*********************/
8521                 /*
8522                  * if AUTH for DATA is required and no AUTH has been added
8523                  * yet, account for this in the mtu now... if no data can be
8524                  * bundled, this adjustment won't matter anyways since the
8525                  * packet will be going out...
8526                  */
8527                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8528                     stcb->asoc.peer_auth_chunks);
8529                 if (data_auth_reqd && (auth == NULL)) {
8530                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8531                 }
8532                 /* now lets add any data within the MTU constraints */
8533                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8534 #ifdef INET
8535                 case AF_INET:
8536                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8537                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8538                         else
8539                                 omtu = 0;
8540                         break;
8541 #endif
8542 #ifdef INET6
8543                 case AF_INET6:
8544                         if (net->mtu > SCTP_MIN_OVERHEAD)
8545                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8546                         else
8547                                 omtu = 0;
8548                         break;
8549 #endif
8550                 default:
8551                         /* TSNH */
8552                         omtu = 0;
8553                         break;
8554                 }
8555                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8556                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8557                     (skip_data_for_this_net == 0)) ||
8558                     (cookie)) {
8559                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8560                                 if (no_data_chunks) {
8561                                         /* let only control go out */
8562                                         *reason_code = 1;
8563                                         break;
8564                                 }
8565                                 if (net->flight_size >= net->cwnd) {
8566                                         /* skip this net, no room for data */
8567                                         *reason_code = 2;
8568                                         break;
8569                                 }
8570                                 if ((chk->whoTo != NULL) &&
8571                                     (chk->whoTo != net)) {
8572                                         /* Don't send the chunk on this net */
8573                                         continue;
8574                                 }
8575
8576                                 if (asoc->sctp_cmt_on_off == 0) {
8577                                         if ((asoc->alternate) &&
8578                                             (asoc->alternate != net) &&
8579                                             (chk->whoTo == NULL)) {
8580                                                 continue;
8581                                         } else if ((net != asoc->primary_destination) &&
8582                                                     (asoc->alternate == NULL) &&
8583                                             (chk->whoTo == NULL)) {
8584                                                 continue;
8585                                         }
8586                                 }
8587                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8588                                         /*-
8589                                          * strange, we have a chunk that is
8590                                          * to big for its destination and
8591                                          * yet no fragment ok flag.
8592                                          * Something went wrong when the
8593                                          * PMTU changed...we did not mark
8594                                          * this chunk for some reason?? I
8595                                          * will fix it here by letting IP
8596                                          * fragment it for now and printing
8597                                          * a warning. This really should not
8598                                          * happen ...
8599                                          */
8600                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8601                                             chk->send_size, mtu);
8602                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8603                                 }
8604                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8605                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8606                                         struct sctp_data_chunk *dchkh;
8607
8608                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8609                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8610                                 }
8611                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8612                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8613                                         /* ok we will add this one */
8614
8615                                         /*
8616                                          * Add an AUTH chunk, if chunk
8617                                          * requires it, save the offset into
8618                                          * the chain for AUTH
8619                                          */
8620                                         if (data_auth_reqd) {
8621                                                 if (auth == NULL) {
8622                                                         outchain = sctp_add_auth_chunk(outchain,
8623                                                             &endoutchain,
8624                                                             &auth,
8625                                                             &auth_offset,
8626                                                             stcb,
8627                                                             SCTP_DATA);
8628                                                         auth_keyid = chk->auth_keyid;
8629                                                         override_ok = 0;
8630                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8631                                                 } else if (override_ok) {
8632                                                         /*
8633                                                          * use this data's
8634                                                          * keyid
8635                                                          */
8636                                                         auth_keyid = chk->auth_keyid;
8637                                                         override_ok = 0;
8638                                                 } else if (auth_keyid != chk->auth_keyid) {
8639                                                         /*
8640                                                          * different keyid,
8641                                                          * so done bundling
8642                                                          */
8643                                                         break;
8644                                                 }
8645                                         }
8646                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8647                                             chk->send_size, chk->copy_by_ref);
8648                                         if (outchain == NULL) {
8649                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8650                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8651                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8652                                                 }
8653                                                 *reason_code = 3;
8654                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8655                                                 return (ENOMEM);
8656                                         }
8657                                         /* upate our MTU size */
8658                                         /* Do clear IP_DF ? */
8659                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8660                                                 no_fragmentflg = 0;
8661                                         }
8662                                         /* unsigned subtraction of mtu */
8663                                         if (mtu > chk->send_size)
8664                                                 mtu -= chk->send_size;
8665                                         else
8666                                                 mtu = 0;
8667                                         /* unsigned subtraction of r_mtu */
8668                                         if (r_mtu > chk->send_size)
8669                                                 r_mtu -= chk->send_size;
8670                                         else
8671                                                 r_mtu = 0;
8672
8673                                         to_out += chk->send_size;
8674                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8675 #ifdef INVARIANTS
8676                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8677 #else
8678                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8679                                                     mx_mtu, to_out);
8680 #endif
8681                                         }
8682                                         chk->window_probe = 0;
8683                                         data_list[bundle_at++] = chk;
8684                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8685                                                 break;
8686                                         }
8687                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8688                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8689                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8690                                                 } else {
8691                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8692                                                 }
8693                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8694                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8695                                                         /*
8696                                                          * Count number of
8697                                                          * user msg's that
8698                                                          * were fragmented
8699                                                          * we do this by
8700                                                          * counting when we
8701                                                          * see a LAST
8702                                                          * fragment only.
8703                                                          */
8704                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8705                                         }
8706                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8707                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8708                                                         data_list[0]->window_probe = 1;
8709                                                         net->window_probe = 1;
8710                                                 }
8711                                                 break;
8712                                         }
8713                                 } else {
8714                                         /*
8715                                          * Must be sent in order of the
8716                                          * TSN's (on a network)
8717                                          */
8718                                         break;
8719                                 }
8720                         }       /* for (chunk gather loop for this net) */
8721                 }               /* if asoc.state OPEN */
8722 no_data_fill:
8723                 /* Is there something to send for this destination? */
8724                 if (outchain) {
8725                         /* We may need to start a control timer or two */
8726                         if (asconf) {
8727                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8728                                     stcb, net);
8729                                 /*
8730                                  * do NOT clear the asconf flag as it is
8731                                  * used to do appropriate source address
8732                                  * selection.
8733                                  */
8734                         }
8735                         if (cookie) {
8736                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8737                                 cookie = 0;
8738                         }
8739                         /* must start a send timer if data is being sent */
8740                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8741                                 /*
8742                                  * no timer running on this destination
8743                                  * restart it.
8744                                  */
8745                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8746                         }
8747                         if (bundle_at || hbflag) {
8748                                 /* For data/asconf and hb set time */
8749                                 if (*now_filled == 0) {
8750                                         (void)SCTP_GETTIME_TIMEVAL(now);
8751                                         *now_filled = 1;
8752                                 }
8753                                 net->last_sent_time = *now;
8754                         }
8755                         /* Now send it, if there is anything to send :> */
8756                         if ((error = sctp_lowlevel_chunk_output(inp,
8757                             stcb,
8758                             net,
8759                             (struct sockaddr *)&net->ro._l_addr,
8760                             outchain,
8761                             auth_offset,
8762                             auth,
8763                             auth_keyid,
8764                             no_fragmentflg,
8765                             bundle_at,
8766                             asconf,
8767                             inp->sctp_lport, stcb->rport,
8768                             htonl(stcb->asoc.peer_vtag),
8769                             net->port, NULL,
8770                             0, 0,
8771                             so_locked))) {
8772                                 /* error, we could not output */
8773                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8774                                 if (from_where == 0) {
8775                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8776                                 }
8777                                 if (error == ENOBUFS) {
8778                                         asoc->ifp_had_enobuf = 1;
8779                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8780                                 }
8781                                 if (error == EHOSTUNREACH) {
8782                                         /*
8783                                          * Destination went unreachable
8784                                          * during this send
8785                                          */
8786                                         sctp_move_chunks_from_net(stcb, net);
8787                                 }
8788                                 *reason_code = 6;
8789                                 /*-
8790                                  * I add this line to be paranoid. As far as
8791                                  * I can tell the continue, takes us back to
8792                                  * the top of the for, but just to make sure
8793                                  * I will reset these again here.
8794                                  */
8795                                 ctl_cnt = 0;
8796                                 continue;       /* This takes us back to the
8797                                                  * for() for the nets. */
8798                         } else {
8799                                 asoc->ifp_had_enobuf = 0;
8800                         }
8801                         endoutchain = NULL;
8802                         auth = NULL;
8803                         auth_offset = 0;
8804                         if (!no_out_cnt) {
8805                                 *num_out += (ctl_cnt + bundle_at);
8806                         }
8807                         if (bundle_at) {
8808                                 /* setup for a RTO measurement */
8809                                 tsns_sent = data_list[0]->rec.data.tsn;
8810                                 /* fill time if not already filled */
8811                                 if (*now_filled == 0) {
8812                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8813                                         *now_filled = 1;
8814                                         *now = asoc->time_last_sent;
8815                                 } else {
8816                                         asoc->time_last_sent = *now;
8817                                 }
8818                                 if (net->rto_needed) {
8819                                         data_list[0]->do_rtt = 1;
8820                                         net->rto_needed = 0;
8821                                 }
8822                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8823                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8824                         }
8825                         if (one_chunk) {
8826                                 break;
8827                         }
8828                 }
8829                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8830                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8831                 }
8832         }
8833         if (old_start_at == NULL) {
8834                 old_start_at = start_at;
8835                 start_at = TAILQ_FIRST(&asoc->nets);
8836                 if (old_start_at)
8837                         goto again_one_more_time;
8838         }
8839
8840         /*
8841          * At the end there should be no NON timed chunks hanging on this
8842          * queue.
8843          */
8844         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8845                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8846         }
8847         if ((*num_out == 0) && (*reason_code == 0)) {
8848                 *reason_code = 4;
8849         } else {
8850                 *reason_code = 5;
8851         }
8852         sctp_clean_up_ctl(stcb, asoc, so_locked);
8853         return (0);
8854 }
8855
8856 void
8857 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8858 {
8859         /*-
8860          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8861          * the control chunk queue.
8862          */
8863         struct sctp_chunkhdr *hdr;
8864         struct sctp_tmit_chunk *chk;
8865         struct mbuf *mat, *last_mbuf;
8866         uint32_t chunk_length;
8867         uint16_t padding_length;
8868
8869         SCTP_TCB_LOCK_ASSERT(stcb);
8870         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8871         if (op_err == NULL) {
8872                 return;
8873         }
8874         last_mbuf = NULL;
8875         chunk_length = 0;
8876         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8877                 chunk_length += SCTP_BUF_LEN(mat);
8878                 if (SCTP_BUF_NEXT(mat) == NULL) {
8879                         last_mbuf = mat;
8880                 }
8881         }
8882         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8883                 sctp_m_freem(op_err);
8884                 return;
8885         }
8886         padding_length = chunk_length % 4;
8887         if (padding_length != 0) {
8888                 padding_length = 4 - padding_length;
8889         }
8890         if (padding_length != 0) {
8891                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8892                         sctp_m_freem(op_err);
8893                         return;
8894                 }
8895         }
8896         sctp_alloc_a_chunk(stcb, chk);
8897         if (chk == NULL) {
8898                 /* no memory */
8899                 sctp_m_freem(op_err);
8900                 return;
8901         }
8902         chk->copy_by_ref = 0;
8903         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8904         chk->rec.chunk_id.can_take_data = 0;
8905         chk->flags = 0;
8906         chk->send_size = (uint16_t)chunk_length;
8907         chk->sent = SCTP_DATAGRAM_UNSENT;
8908         chk->snd_count = 0;
8909         chk->asoc = &stcb->asoc;
8910         chk->data = op_err;
8911         chk->whoTo = NULL;
8912         hdr = mtod(op_err, struct sctp_chunkhdr *);
8913         hdr->chunk_type = SCTP_OPERATION_ERROR;
8914         hdr->chunk_flags = 0;
8915         hdr->chunk_length = htons(chk->send_size);
8916         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8917         chk->asoc->ctrl_queue_cnt++;
8918 }
8919
8920 int
8921 sctp_send_cookie_echo(struct mbuf *m,
8922     int offset, int limit,
8923     struct sctp_tcb *stcb,
8924     struct sctp_nets *net)
8925 {
8926         /*-
8927          * pull out the cookie and put it at the front of the control chunk
8928          * queue.
8929          */
8930         int at;
8931         struct mbuf *cookie;
8932         struct sctp_paramhdr param, *phdr;
8933         struct sctp_chunkhdr *hdr;
8934         struct sctp_tmit_chunk *chk;
8935         uint16_t ptype, plen;
8936
8937         SCTP_TCB_LOCK_ASSERT(stcb);
8938         /* First find the cookie in the param area */
8939         cookie = NULL;
8940         at = offset + sizeof(struct sctp_init_chunk);
8941         for (;;) {
8942                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8943                 if (phdr == NULL) {
8944                         return (-3);
8945                 }
8946                 ptype = ntohs(phdr->param_type);
8947                 plen = ntohs(phdr->param_length);
8948                 if (plen < sizeof(struct sctp_paramhdr)) {
8949                         return (-6);
8950                 }
8951                 if (ptype == SCTP_STATE_COOKIE) {
8952                         int pad;
8953
8954                         /* found the cookie */
8955                         if (at + plen > limit) {
8956                                 return (-7);
8957                         }
8958                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8959                         if (cookie == NULL) {
8960                                 /* No memory */
8961                                 return (-2);
8962                         }
8963                         if ((pad = (plen % 4)) > 0) {
8964                                 pad = 4 - pad;
8965                         }
8966                         if (pad > 0) {
8967                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
8968                                         return (-8);
8969                                 }
8970                         }
8971 #ifdef SCTP_MBUF_LOGGING
8972                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8973                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8974                         }
8975 #endif
8976                         break;
8977                 }
8978                 at += SCTP_SIZE32(plen);
8979         }
8980         /* ok, we got the cookie lets change it into a cookie echo chunk */
8981         /* first the change from param to cookie */
8982         hdr = mtod(cookie, struct sctp_chunkhdr *);
8983         hdr->chunk_type = SCTP_COOKIE_ECHO;
8984         hdr->chunk_flags = 0;
8985         /* get the chunk stuff now and place it in the FRONT of the queue */
8986         sctp_alloc_a_chunk(stcb, chk);
8987         if (chk == NULL) {
8988                 /* no memory */
8989                 sctp_m_freem(cookie);
8990                 return (-5);
8991         }
8992         chk->copy_by_ref = 0;
8993         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8994         chk->rec.chunk_id.can_take_data = 0;
8995         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8996         chk->send_size = SCTP_SIZE32(plen);
8997         chk->sent = SCTP_DATAGRAM_UNSENT;
8998         chk->snd_count = 0;
8999         chk->asoc = &stcb->asoc;
9000         chk->data = cookie;
9001         chk->whoTo = net;
9002         atomic_add_int(&chk->whoTo->ref_count, 1);
9003         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9004         chk->asoc->ctrl_queue_cnt++;
9005         return (0);
9006 }
9007
9008 void
9009 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9010     struct mbuf *m,
9011     int offset,
9012     int chk_length,
9013     struct sctp_nets *net)
9014 {
9015         /*
9016          * take a HB request and make it into a HB ack and send it.
9017          */
9018         struct mbuf *outchain;
9019         struct sctp_chunkhdr *chdr;
9020         struct sctp_tmit_chunk *chk;
9021
9022         if (net == NULL)
9023                 /* must have a net pointer */
9024                 return;
9025
9026         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9027         if (outchain == NULL) {
9028                 /* gak out of memory */
9029                 return;
9030         }
9031 #ifdef SCTP_MBUF_LOGGING
9032         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9033                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9034         }
9035 #endif
9036         chdr = mtod(outchain, struct sctp_chunkhdr *);
9037         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9038         chdr->chunk_flags = 0;
9039         if (chk_length % 4 != 0) {
9040                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9041         }
9042         sctp_alloc_a_chunk(stcb, chk);
9043         if (chk == NULL) {
9044                 /* no memory */
9045                 sctp_m_freem(outchain);
9046                 return;
9047         }
9048         chk->copy_by_ref = 0;
9049         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9050         chk->rec.chunk_id.can_take_data = 1;
9051         chk->flags = 0;
9052         chk->send_size = chk_length;
9053         chk->sent = SCTP_DATAGRAM_UNSENT;
9054         chk->snd_count = 0;
9055         chk->asoc = &stcb->asoc;
9056         chk->data = outchain;
9057         chk->whoTo = net;
9058         atomic_add_int(&chk->whoTo->ref_count, 1);
9059         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9060         chk->asoc->ctrl_queue_cnt++;
9061 }
9062
9063 void
9064 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9065 {
9066         /* formulate and queue a cookie-ack back to sender */
9067         struct mbuf *cookie_ack;
9068         struct sctp_chunkhdr *hdr;
9069         struct sctp_tmit_chunk *chk;
9070
9071         SCTP_TCB_LOCK_ASSERT(stcb);
9072
9073         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9074         if (cookie_ack == NULL) {
9075                 /* no mbuf's */
9076                 return;
9077         }
9078         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9079         sctp_alloc_a_chunk(stcb, chk);
9080         if (chk == NULL) {
9081                 /* no memory */
9082                 sctp_m_freem(cookie_ack);
9083                 return;
9084         }
9085         chk->copy_by_ref = 0;
9086         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9087         chk->rec.chunk_id.can_take_data = 1;
9088         chk->flags = 0;
9089         chk->send_size = sizeof(struct sctp_chunkhdr);
9090         chk->sent = SCTP_DATAGRAM_UNSENT;
9091         chk->snd_count = 0;
9092         chk->asoc = &stcb->asoc;
9093         chk->data = cookie_ack;
9094         if (chk->asoc->last_control_chunk_from != NULL) {
9095                 chk->whoTo = chk->asoc->last_control_chunk_from;
9096                 atomic_add_int(&chk->whoTo->ref_count, 1);
9097         } else {
9098                 chk->whoTo = NULL;
9099         }
9100         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9101         hdr->chunk_type = SCTP_COOKIE_ACK;
9102         hdr->chunk_flags = 0;
9103         hdr->chunk_length = htons(chk->send_size);
9104         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9105         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9106         chk->asoc->ctrl_queue_cnt++;
9107         return;
9108 }
9109
9110 void
9111 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9112 {
9113         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9114         struct mbuf *m_shutdown_ack;
9115         struct sctp_shutdown_ack_chunk *ack_cp;
9116         struct sctp_tmit_chunk *chk;
9117
9118         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9119         if (m_shutdown_ack == NULL) {
9120                 /* no mbuf's */
9121                 return;
9122         }
9123         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9124         sctp_alloc_a_chunk(stcb, chk);
9125         if (chk == NULL) {
9126                 /* no memory */
9127                 sctp_m_freem(m_shutdown_ack);
9128                 return;
9129         }
9130         chk->copy_by_ref = 0;
9131         chk->rec.chunk_id.id = SCTP_SHUTDOWN_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 = m_shutdown_ack;
9139         chk->whoTo = net;
9140         if (chk->whoTo) {
9141                 atomic_add_int(&chk->whoTo->ref_count, 1);
9142         }
9143         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9144         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9145         ack_cp->ch.chunk_flags = 0;
9146         ack_cp->ch.chunk_length = htons(chk->send_size);
9147         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9148         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9149         chk->asoc->ctrl_queue_cnt++;
9150         return;
9151 }
9152
9153 void
9154 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9155 {
9156         /* formulate and queue a SHUTDOWN to the sender */
9157         struct mbuf *m_shutdown;
9158         struct sctp_shutdown_chunk *shutdown_cp;
9159         struct sctp_tmit_chunk *chk;
9160
9161         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9162                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9163                         /* We already have a SHUTDOWN queued. Reuse it. */
9164                         if (chk->whoTo) {
9165                                 sctp_free_remote_addr(chk->whoTo);
9166                                 chk->whoTo = NULL;
9167                         }
9168                         break;
9169                 }
9170         }
9171         if (chk == NULL) {
9172                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9173                 if (m_shutdown == NULL) {
9174                         /* no mbuf's */
9175                         return;
9176                 }
9177                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9178                 sctp_alloc_a_chunk(stcb, chk);
9179                 if (chk == NULL) {
9180                         /* no memory */
9181                         sctp_m_freem(m_shutdown);
9182                         return;
9183                 }
9184                 chk->copy_by_ref = 0;
9185                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9186                 chk->rec.chunk_id.can_take_data = 1;
9187                 chk->flags = 0;
9188                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9189                 chk->sent = SCTP_DATAGRAM_UNSENT;
9190                 chk->snd_count = 0;
9191                 chk->asoc = &stcb->asoc;
9192                 chk->data = m_shutdown;
9193                 chk->whoTo = net;
9194                 if (chk->whoTo) {
9195                         atomic_add_int(&chk->whoTo->ref_count, 1);
9196                 }
9197                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9198                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9199                 shutdown_cp->ch.chunk_flags = 0;
9200                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9201                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9202                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9203                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9204                 chk->asoc->ctrl_queue_cnt++;
9205         } else {
9206                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9207                 chk->whoTo = net;
9208                 if (chk->whoTo) {
9209                         atomic_add_int(&chk->whoTo->ref_count, 1);
9210                 }
9211                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9212                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9213                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9214         }
9215         return;
9216 }
9217
9218 void
9219 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9220 {
9221         /*
9222          * formulate and queue an ASCONF to the peer. ASCONF parameters
9223          * should be queued on the assoc queue.
9224          */
9225         struct sctp_tmit_chunk *chk;
9226         struct mbuf *m_asconf;
9227         int len;
9228
9229         SCTP_TCB_LOCK_ASSERT(stcb);
9230
9231         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9232             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9233                 /* can't send a new one if there is one in flight already */
9234                 return;
9235         }
9236
9237         /* compose an ASCONF chunk, maximum length is PMTU */
9238         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9239         if (m_asconf == NULL) {
9240                 return;
9241         }
9242
9243         sctp_alloc_a_chunk(stcb, chk);
9244         if (chk == NULL) {
9245                 /* no memory */
9246                 sctp_m_freem(m_asconf);
9247                 return;
9248         }
9249
9250         chk->copy_by_ref = 0;
9251         chk->rec.chunk_id.id = SCTP_ASCONF;
9252         chk->rec.chunk_id.can_take_data = 0;
9253         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9254         chk->data = m_asconf;
9255         chk->send_size = len;
9256         chk->sent = SCTP_DATAGRAM_UNSENT;
9257         chk->snd_count = 0;
9258         chk->asoc = &stcb->asoc;
9259         chk->whoTo = net;
9260         if (chk->whoTo) {
9261                 atomic_add_int(&chk->whoTo->ref_count, 1);
9262         }
9263         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9264         chk->asoc->ctrl_queue_cnt++;
9265         return;
9266 }
9267
9268 void
9269 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9270 {
9271         /*
9272          * formulate and queue a asconf-ack back to sender. the asconf-ack
9273          * must be stored in the tcb.
9274          */
9275         struct sctp_tmit_chunk *chk;
9276         struct sctp_asconf_ack *ack, *latest_ack;
9277         struct mbuf *m_ack;
9278         struct sctp_nets *net = NULL;
9279
9280         SCTP_TCB_LOCK_ASSERT(stcb);
9281         /* Get the latest ASCONF-ACK */
9282         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9283         if (latest_ack == NULL) {
9284                 return;
9285         }
9286         if (latest_ack->last_sent_to != NULL &&
9287             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9288                 /* we're doing a retransmission */
9289                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9290                 if (net == NULL) {
9291                         /* no alternate */
9292                         if (stcb->asoc.last_control_chunk_from == NULL) {
9293                                 if (stcb->asoc.alternate) {
9294                                         net = stcb->asoc.alternate;
9295                                 } else {
9296                                         net = stcb->asoc.primary_destination;
9297                                 }
9298                         } else {
9299                                 net = stcb->asoc.last_control_chunk_from;
9300                         }
9301                 }
9302         } else {
9303                 /* normal case */
9304                 if (stcb->asoc.last_control_chunk_from == NULL) {
9305                         if (stcb->asoc.alternate) {
9306                                 net = stcb->asoc.alternate;
9307                         } else {
9308                                 net = stcb->asoc.primary_destination;
9309                         }
9310                 } else {
9311                         net = stcb->asoc.last_control_chunk_from;
9312                 }
9313         }
9314         latest_ack->last_sent_to = net;
9315
9316         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9317                 if (ack->data == NULL) {
9318                         continue;
9319                 }
9320
9321                 /* copy the asconf_ack */
9322                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9323                 if (m_ack == NULL) {
9324                         /* couldn't copy it */
9325                         return;
9326                 }
9327 #ifdef SCTP_MBUF_LOGGING
9328                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9329                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9330                 }
9331 #endif
9332
9333                 sctp_alloc_a_chunk(stcb, chk);
9334                 if (chk == NULL) {
9335                         /* no memory */
9336                         if (m_ack)
9337                                 sctp_m_freem(m_ack);
9338                         return;
9339                 }
9340                 chk->copy_by_ref = 0;
9341                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9342                 chk->rec.chunk_id.can_take_data = 1;
9343                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9344                 chk->whoTo = net;
9345                 if (chk->whoTo) {
9346                         atomic_add_int(&chk->whoTo->ref_count, 1);
9347                 }
9348                 chk->data = m_ack;
9349                 chk->send_size = ack->len;
9350                 chk->sent = SCTP_DATAGRAM_UNSENT;
9351                 chk->snd_count = 0;
9352                 chk->asoc = &stcb->asoc;
9353
9354                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9355                 chk->asoc->ctrl_queue_cnt++;
9356         }
9357         return;
9358 }
9359
9360 static int
9361 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9362     struct sctp_tcb *stcb,
9363     struct sctp_association *asoc,
9364     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9365 {
9366         /*-
9367          * send out one MTU of retransmission. If fast_retransmit is
9368          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9369          * rwnd. For a Cookie or Asconf in the control chunk queue we
9370          * retransmit them by themselves.
9371          *
9372          * For data chunks we will pick out the lowest TSN's in the sent_queue
9373          * marked for resend and bundle them all together (up to a MTU of
9374          * destination). The address to send to should have been
9375          * selected/changed where the retransmission was marked (i.e. in FR
9376          * or t3-timeout routines).
9377          */
9378         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9379         struct sctp_tmit_chunk *chk, *fwd;
9380         struct mbuf *m, *endofchain;
9381         struct sctp_nets *net = NULL;
9382         uint32_t tsns_sent = 0;
9383         int no_fragmentflg, bundle_at, cnt_thru;
9384         unsigned int mtu;
9385         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9386         struct sctp_auth_chunk *auth = NULL;
9387         uint32_t auth_offset = 0;
9388         uint16_t auth_keyid;
9389         int override_ok = 1;
9390         int data_auth_reqd = 0;
9391         uint32_t dmtu = 0;
9392
9393         SCTP_TCB_LOCK_ASSERT(stcb);
9394         tmr_started = ctl_cnt = 0;
9395         no_fragmentflg = 1;
9396         fwd_tsn = 0;
9397         *cnt_out = 0;
9398         fwd = NULL;
9399         endofchain = m = NULL;
9400         auth_keyid = stcb->asoc.authinfo.active_keyid;
9401 #ifdef SCTP_AUDITING_ENABLED
9402         sctp_audit_log(0xC3, 1);
9403 #endif
9404         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9405             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9406                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9407                     asoc->sent_queue_retran_cnt);
9408                 asoc->sent_queue_cnt = 0;
9409                 asoc->sent_queue_cnt_removeable = 0;
9410                 /* send back 0/0 so we enter normal transmission */
9411                 *cnt_out = 0;
9412                 return (0);
9413         }
9414         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9415                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9416                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9417                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9418                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9419                                 continue;
9420                         }
9421                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9422                                 if (chk != asoc->str_reset) {
9423                                         /*
9424                                          * not eligible for retran if its
9425                                          * not ours
9426                                          */
9427                                         continue;
9428                                 }
9429                         }
9430                         ctl_cnt++;
9431                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9432                                 fwd_tsn = 1;
9433                         }
9434                         /*
9435                          * Add an AUTH chunk, if chunk requires it save the
9436                          * offset into the chain for AUTH
9437                          */
9438                         if ((auth == NULL) &&
9439                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9440                             stcb->asoc.peer_auth_chunks))) {
9441                                 m = sctp_add_auth_chunk(m, &endofchain,
9442                                     &auth, &auth_offset,
9443                                     stcb,
9444                                     chk->rec.chunk_id.id);
9445                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9446                         }
9447                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9448                         break;
9449                 }
9450         }
9451         one_chunk = 0;
9452         cnt_thru = 0;
9453         /* do we have control chunks to retransmit? */
9454         if (m != NULL) {
9455                 /* Start a timer no matter if we succeed or fail */
9456                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9457                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9458                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9459                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9460                 chk->snd_count++;       /* update our count */
9461                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9462                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9463                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9464                     no_fragmentflg, 0, 0,
9465                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9466                     chk->whoTo->port, NULL,
9467                     0, 0,
9468                     so_locked))) {
9469                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9470                         if (error == ENOBUFS) {
9471                                 asoc->ifp_had_enobuf = 1;
9472                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9473                         }
9474                         return (error);
9475                 } else {
9476                         asoc->ifp_had_enobuf = 0;
9477                 }
9478                 endofchain = NULL;
9479                 auth = NULL;
9480                 auth_offset = 0;
9481                 /*
9482                  * We don't want to mark the net->sent time here since this
9483                  * we use this for HB and retrans cannot measure RTT
9484                  */
9485                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9486                 *cnt_out += 1;
9487                 chk->sent = SCTP_DATAGRAM_SENT;
9488                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9489                 if (fwd_tsn == 0) {
9490                         return (0);
9491                 } else {
9492                         /* Clean up the fwd-tsn list */
9493                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9494                         return (0);
9495                 }
9496         }
9497         /*
9498          * Ok, it is just data retransmission we need to do or that and a
9499          * fwd-tsn with it all.
9500          */
9501         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9502                 return (SCTP_RETRAN_DONE);
9503         }
9504         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9505             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9506                 /* not yet open, resend the cookie and that is it */
9507                 return (1);
9508         }
9509 #ifdef SCTP_AUDITING_ENABLED
9510         sctp_auditing(20, inp, stcb, NULL);
9511 #endif
9512         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9513         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9514                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9515                         /* No, not sent to this net or not ready for rtx */
9516                         continue;
9517                 }
9518                 if (chk->data == NULL) {
9519                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9520                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9521                         continue;
9522                 }
9523                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9524                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9525                         struct mbuf *op_err;
9526                         char msg[SCTP_DIAG_INFO_LEN];
9527
9528                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9529                             chk->rec.data.tsn, chk->snd_count);
9530                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9531                             msg);
9532                         atomic_add_int(&stcb->asoc.refcnt, 1);
9533                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9534                             so_locked);
9535                         SCTP_TCB_LOCK(stcb);
9536                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9537                         return (SCTP_RETRAN_EXIT);
9538                 }
9539                 /* pick up the net */
9540                 net = chk->whoTo;
9541                 switch (net->ro._l_addr.sa.sa_family) {
9542 #ifdef INET
9543                 case AF_INET:
9544                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9545                         break;
9546 #endif
9547 #ifdef INET6
9548                 case AF_INET6:
9549                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9550                         break;
9551 #endif
9552                 default:
9553                         /* TSNH */
9554                         mtu = net->mtu;
9555                         break;
9556                 }
9557
9558                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9559                         /* No room in peers rwnd */
9560                         uint32_t tsn;
9561
9562                         tsn = asoc->last_acked_seq + 1;
9563                         if (tsn == chk->rec.data.tsn) {
9564                                 /*
9565                                  * we make a special exception for this
9566                                  * case. The peer has no rwnd but is missing
9567                                  * the lowest chunk.. which is probably what
9568                                  * is holding up the rwnd.
9569                                  */
9570                                 goto one_chunk_around;
9571                         }
9572                         return (1);
9573                 }
9574 one_chunk_around:
9575                 if (asoc->peers_rwnd < mtu) {
9576                         one_chunk = 1;
9577                         if ((asoc->peers_rwnd == 0) &&
9578                             (asoc->total_flight == 0)) {
9579                                 chk->window_probe = 1;
9580                                 chk->whoTo->window_probe = 1;
9581                         }
9582                 }
9583 #ifdef SCTP_AUDITING_ENABLED
9584                 sctp_audit_log(0xC3, 2);
9585 #endif
9586                 bundle_at = 0;
9587                 m = NULL;
9588                 net->fast_retran_ip = 0;
9589                 if (chk->rec.data.doing_fast_retransmit == 0) {
9590                         /*
9591                          * if no FR in progress skip destination that have
9592                          * flight_size > cwnd.
9593                          */
9594                         if (net->flight_size >= net->cwnd) {
9595                                 continue;
9596                         }
9597                 } else {
9598                         /*
9599                          * Mark the destination net to have FR recovery
9600                          * limits put on it.
9601                          */
9602                         *fr_done = 1;
9603                         net->fast_retran_ip = 1;
9604                 }
9605
9606                 /*
9607                  * if no AUTH is yet included and this chunk requires it,
9608                  * make sure to account for it.  We don't apply the size
9609                  * until the AUTH chunk is actually added below in case
9610                  * there is no room for this chunk.
9611                  */
9612                 if (data_auth_reqd && (auth == NULL)) {
9613                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9614                 } else
9615                         dmtu = 0;
9616
9617                 if ((chk->send_size <= (mtu - dmtu)) ||
9618                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9619                         /* ok we will add this one */
9620                         if (data_auth_reqd) {
9621                                 if (auth == NULL) {
9622                                         m = sctp_add_auth_chunk(m,
9623                                             &endofchain,
9624                                             &auth,
9625                                             &auth_offset,
9626                                             stcb,
9627                                             SCTP_DATA);
9628                                         auth_keyid = chk->auth_keyid;
9629                                         override_ok = 0;
9630                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9631                                 } else if (override_ok) {
9632                                         auth_keyid = chk->auth_keyid;
9633                                         override_ok = 0;
9634                                 } else if (chk->auth_keyid != auth_keyid) {
9635                                         /* different keyid, so done bundling */
9636                                         break;
9637                                 }
9638                         }
9639                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9640                         if (m == NULL) {
9641                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9642                                 return (ENOMEM);
9643                         }
9644                         /* Do clear IP_DF ? */
9645                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9646                                 no_fragmentflg = 0;
9647                         }
9648                         /* upate our MTU size */
9649                         if (mtu > (chk->send_size + dmtu))
9650                                 mtu -= (chk->send_size + dmtu);
9651                         else
9652                                 mtu = 0;
9653                         data_list[bundle_at++] = chk;
9654                         if (one_chunk && (asoc->total_flight <= 0)) {
9655                                 SCTP_STAT_INCR(sctps_windowprobed);
9656                         }
9657                 }
9658                 if (one_chunk == 0) {
9659                         /*
9660                          * now are there anymore forward from chk to pick
9661                          * up?
9662                          */
9663                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9664                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9665                                         /* Nope, not for retran */
9666                                         continue;
9667                                 }
9668                                 if (fwd->whoTo != net) {
9669                                         /* Nope, not the net in question */
9670                                         continue;
9671                                 }
9672                                 if (data_auth_reqd && (auth == NULL)) {
9673                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9674                                 } else
9675                                         dmtu = 0;
9676                                 if (fwd->send_size <= (mtu - dmtu)) {
9677                                         if (data_auth_reqd) {
9678                                                 if (auth == NULL) {
9679                                                         m = sctp_add_auth_chunk(m,
9680                                                             &endofchain,
9681                                                             &auth,
9682                                                             &auth_offset,
9683                                                             stcb,
9684                                                             SCTP_DATA);
9685                                                         auth_keyid = fwd->auth_keyid;
9686                                                         override_ok = 0;
9687                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9688                                                 } else if (override_ok) {
9689                                                         auth_keyid = fwd->auth_keyid;
9690                                                         override_ok = 0;
9691                                                 } else if (fwd->auth_keyid != auth_keyid) {
9692                                                         /*
9693                                                          * different keyid,
9694                                                          * so done bundling
9695                                                          */
9696                                                         break;
9697                                                 }
9698                                         }
9699                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9700                                         if (m == NULL) {
9701                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9702                                                 return (ENOMEM);
9703                                         }
9704                                         /* Do clear IP_DF ? */
9705                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9706                                                 no_fragmentflg = 0;
9707                                         }
9708                                         /* upate our MTU size */
9709                                         if (mtu > (fwd->send_size + dmtu))
9710                                                 mtu -= (fwd->send_size + dmtu);
9711                                         else
9712                                                 mtu = 0;
9713                                         data_list[bundle_at++] = fwd;
9714                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9715                                                 break;
9716                                         }
9717                                 } else {
9718                                         /* can't fit so we are done */
9719                                         break;
9720                                 }
9721                         }
9722                 }
9723                 /* Is there something to send for this destination? */
9724                 if (m) {
9725                         /*
9726                          * No matter if we fail/or succeed we should start a
9727                          * timer. A failure is like a lost IP packet :-)
9728                          */
9729                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9730                                 /*
9731                                  * no timer running on this destination
9732                                  * restart it.
9733                                  */
9734                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9735                                 tmr_started = 1;
9736                         }
9737                         /* Now lets send it, if there is anything to send :> */
9738                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9739                             (struct sockaddr *)&net->ro._l_addr, m,
9740                             auth_offset, auth, auth_keyid,
9741                             no_fragmentflg, 0, 0,
9742                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9743                             net->port, NULL,
9744                             0, 0,
9745                             so_locked))) {
9746                                 /* error, we could not output */
9747                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9748                                 if (error == ENOBUFS) {
9749                                         asoc->ifp_had_enobuf = 1;
9750                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9751                                 }
9752                                 return (error);
9753                         } else {
9754                                 asoc->ifp_had_enobuf = 0;
9755                         }
9756                         endofchain = NULL;
9757                         auth = NULL;
9758                         auth_offset = 0;
9759                         /* For HB's */
9760                         /*
9761                          * We don't want to mark the net->sent time here
9762                          * since this we use this for HB and retrans cannot
9763                          * measure RTT
9764                          */
9765                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9766
9767                         /* For auto-close */
9768                         cnt_thru++;
9769                         if (*now_filled == 0) {
9770                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9771                                 *now = asoc->time_last_sent;
9772                                 *now_filled = 1;
9773                         } else {
9774                                 asoc->time_last_sent = *now;
9775                         }
9776                         *cnt_out += bundle_at;
9777 #ifdef SCTP_AUDITING_ENABLED
9778                         sctp_audit_log(0xC4, bundle_at);
9779 #endif
9780                         if (bundle_at) {
9781                                 tsns_sent = data_list[0]->rec.data.tsn;
9782                         }
9783                         for (i = 0; i < bundle_at; i++) {
9784                                 SCTP_STAT_INCR(sctps_sendretransdata);
9785                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9786                                 /*
9787                                  * When we have a revoked data, and we
9788                                  * retransmit it, then we clear the revoked
9789                                  * flag since this flag dictates if we
9790                                  * subtracted from the fs
9791                                  */
9792                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9793                                         /* Deflate the cwnd */
9794                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9795                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9796                                 }
9797                                 data_list[i]->snd_count++;
9798                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9799                                 /* record the time */
9800                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9801                                 if (data_list[i]->book_size_scale) {
9802                                         /*
9803                                          * need to double the book size on
9804                                          * this one
9805                                          */
9806                                         data_list[i]->book_size_scale = 0;
9807                                         /*
9808                                          * Since we double the booksize, we
9809                                          * must also double the output queue
9810                                          * size, since this get shrunk when
9811                                          * we free by this amount.
9812                                          */
9813                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9814                                         data_list[i]->book_size *= 2;
9815                                 } else {
9816                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9817                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9818                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9819                                         }
9820                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9821                                             (uint32_t)(data_list[i]->send_size +
9822                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9823                                 }
9824                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9825                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9826                                             data_list[i]->whoTo->flight_size,
9827                                             data_list[i]->book_size,
9828                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9829                                             data_list[i]->rec.data.tsn);
9830                                 }
9831                                 sctp_flight_size_increase(data_list[i]);
9832                                 sctp_total_flight_increase(stcb, data_list[i]);
9833                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9834                                         /* SWS sender side engages */
9835                                         asoc->peers_rwnd = 0;
9836                                 }
9837                                 if ((i == 0) &&
9838                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9839                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9840                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9841                                             (tmr_started == 0)) {
9842                                                 /*-
9843                                                  * ok we just fast-retrans'd
9844                                                  * the lowest TSN, i.e the
9845                                                  * first on the list. In
9846                                                  * this case we want to give
9847                                                  * some more time to get a
9848                                                  * SACK back without a
9849                                                  * t3-expiring.
9850                                                  */
9851                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9852                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9853                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9854                                         }
9855                                 }
9856                         }
9857                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9858                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9859                         }
9860 #ifdef SCTP_AUDITING_ENABLED
9861                         sctp_auditing(21, inp, stcb, NULL);
9862 #endif
9863                 } else {
9864                         /* None will fit */
9865                         return (1);
9866                 }
9867                 if (asoc->sent_queue_retran_cnt <= 0) {
9868                         /* all done we have no more to retran */
9869                         asoc->sent_queue_retran_cnt = 0;
9870                         break;
9871                 }
9872                 if (one_chunk) {
9873                         /* No more room in rwnd */
9874                         return (1);
9875                 }
9876                 /* stop the for loop here. we sent out a packet */
9877                 break;
9878         }
9879         return (0);
9880 }
9881
9882 static void
9883 sctp_timer_validation(struct sctp_inpcb *inp,
9884     struct sctp_tcb *stcb,
9885     struct sctp_association *asoc)
9886 {
9887         struct sctp_nets *net;
9888
9889         /* Validate that a timer is running somewhere */
9890         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9891                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9892                         /* Here is a timer */
9893                         return;
9894                 }
9895         }
9896         SCTP_TCB_LOCK_ASSERT(stcb);
9897         /* Gak, we did not have a timer somewhere */
9898         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9899         if (asoc->alternate) {
9900                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9901         } else {
9902                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9903         }
9904         return;
9905 }
9906
9907 void
9908 sctp_chunk_output(struct sctp_inpcb *inp,
9909     struct sctp_tcb *stcb,
9910     int from_where,
9911     int so_locked)
9912 {
9913         /*-
9914          * Ok this is the generic chunk service queue. we must do the
9915          * following:
9916          * - See if there are retransmits pending, if so we must
9917          *   do these first.
9918          * - Service the stream queue that is next, moving any
9919          *   message (note I must get a complete message i.e.
9920          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9921          *   TSN's
9922          * - Check to see if the cwnd/rwnd allows any output, if so we
9923          *   go ahead and fomulate and send the low level chunks. Making sure
9924          *   to combine any control in the control chunk queue also.
9925          */
9926         struct sctp_association *asoc;
9927         struct sctp_nets *net;
9928         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9929         unsigned int burst_cnt = 0;
9930         struct timeval now;
9931         int now_filled = 0;
9932         int nagle_on;
9933         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9934         int un_sent = 0;
9935         int fr_done;
9936         unsigned int tot_frs = 0;
9937
9938         asoc = &stcb->asoc;
9939 do_it_again:
9940         /* The Nagle algorithm is only applied when handling a send call. */
9941         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9942                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9943                         nagle_on = 0;
9944                 } else {
9945                         nagle_on = 1;
9946                 }
9947         } else {
9948                 nagle_on = 0;
9949         }
9950         SCTP_TCB_LOCK_ASSERT(stcb);
9951
9952         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9953
9954         if ((un_sent <= 0) &&
9955             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9956             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9957             (asoc->sent_queue_retran_cnt == 0) &&
9958             (asoc->trigger_reset == 0)) {
9959                 /* Nothing to do unless there is something to be sent left */
9960                 return;
9961         }
9962         /*
9963          * Do we have something to send, data or control AND a sack timer
9964          * running, if so piggy-back the sack.
9965          */
9966         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9967                 sctp_send_sack(stcb, so_locked);
9968                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
9969                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
9970         }
9971         while (asoc->sent_queue_retran_cnt) {
9972                 /*-
9973                  * Ok, it is retransmission time only, we send out only ONE
9974                  * packet with a single call off to the retran code.
9975                  */
9976                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9977                         /*-
9978                          * Special hook for handling cookiess discarded
9979                          * by peer that carried data. Send cookie-ack only
9980                          * and then the next call with get the retran's.
9981                          */
9982                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9983                             from_where,
9984                             &now, &now_filled, frag_point, so_locked);
9985                         return;
9986                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9987                         /* if its not from a HB then do it */
9988                         fr_done = 0;
9989                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9990                         if (fr_done) {
9991                                 tot_frs++;
9992                         }
9993                 } else {
9994                         /*
9995                          * its from any other place, we don't allow retran
9996                          * output (only control)
9997                          */
9998                         ret = 1;
9999                 }
10000                 if (ret > 0) {
10001                         /* Can't send anymore */
10002                         /*-
10003                          * now lets push out control by calling med-level
10004                          * output once. this assures that we WILL send HB's
10005                          * if queued too.
10006                          */
10007                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10008                             from_where,
10009                             &now, &now_filled, frag_point, so_locked);
10010 #ifdef SCTP_AUDITING_ENABLED
10011                         sctp_auditing(8, inp, stcb, NULL);
10012 #endif
10013                         sctp_timer_validation(inp, stcb, asoc);
10014                         return;
10015                 }
10016                 if (ret < 0) {
10017                         /*-
10018                          * The count was off.. retran is not happening so do
10019                          * the normal retransmission.
10020                          */
10021 #ifdef SCTP_AUDITING_ENABLED
10022                         sctp_auditing(9, inp, stcb, NULL);
10023 #endif
10024                         if (ret == SCTP_RETRAN_EXIT) {
10025                                 return;
10026                         }
10027                         break;
10028                 }
10029                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10030                         /* Only one transmission allowed out of a timeout */
10031 #ifdef SCTP_AUDITING_ENABLED
10032                         sctp_auditing(10, inp, stcb, NULL);
10033 #endif
10034                         /* Push out any control */
10035                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10036                             &now, &now_filled, frag_point, so_locked);
10037                         return;
10038                 }
10039                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10040                         /* Hit FR burst limit */
10041                         return;
10042                 }
10043                 if ((num_out == 0) && (ret == 0)) {
10044                         /* No more retrans to send */
10045                         break;
10046                 }
10047         }
10048 #ifdef SCTP_AUDITING_ENABLED
10049         sctp_auditing(12, inp, stcb, NULL);
10050 #endif
10051         /* Check for bad destinations, if they exist move chunks around. */
10052         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10053                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10054                         /*-
10055                          * if possible move things off of this address we
10056                          * still may send below due to the dormant state but
10057                          * we try to find an alternate address to send to
10058                          * and if we have one we move all queued data on the
10059                          * out wheel to this alternate address.
10060                          */
10061                         if (net->ref_count > 1)
10062                                 sctp_move_chunks_from_net(stcb, net);
10063                 } else {
10064                         /*-
10065                          * if ((asoc->sat_network) || (net->addr_is_local))
10066                          * { burst_limit = asoc->max_burst *
10067                          * SCTP_SAT_NETWORK_BURST_INCR; }
10068                          */
10069                         if (asoc->max_burst > 0) {
10070                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10071                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10072                                                 /*
10073                                                  * JRS - Use the congestion
10074                                                  * control given in the
10075                                                  * congestion control module
10076                                                  */
10077                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10078                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10079                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10080                                                 }
10081                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10082                                         }
10083                                         net->fast_retran_ip = 0;
10084                                 } else {
10085                                         if (net->flight_size == 0) {
10086                                                 /*
10087                                                  * Should be decaying the
10088                                                  * cwnd here
10089                                                  */
10090                                                 ;
10091                                         }
10092                                 }
10093                         }
10094                 }
10095         }
10096         burst_cnt = 0;
10097         do {
10098                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10099                     &reason_code, 0, from_where,
10100                     &now, &now_filled, frag_point, so_locked);
10101                 if (error) {
10102                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10103                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10104                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10105                         }
10106                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10107                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10108                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10109                         }
10110                         break;
10111                 }
10112                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10113
10114                 tot_out += num_out;
10115                 burst_cnt++;
10116                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10117                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10118                         if (num_out == 0) {
10119                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10120                         }
10121                 }
10122                 if (nagle_on) {
10123                         /*
10124                          * When the Nagle algorithm is used, look at how
10125                          * much is unsent, then if its smaller than an MTU
10126                          * and we have data in flight we stop, except if we
10127                          * are handling a fragmented user message.
10128                          */
10129                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10130                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10131                             (stcb->asoc.total_flight > 0)) {
10132 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10133                                 break;
10134                         }
10135                 }
10136                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10137                     TAILQ_EMPTY(&asoc->send_queue) &&
10138                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10139                         /* Nothing left to send */
10140                         break;
10141                 }
10142                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10143                         /* Nothing left to send */
10144                         break;
10145                 }
10146         } while (num_out &&
10147             ((asoc->max_burst == 0) ||
10148             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10149             (burst_cnt < asoc->max_burst)));
10150
10151         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10152                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10153                         SCTP_STAT_INCR(sctps_maxburstqueued);
10154                         asoc->burst_limit_applied = 1;
10155                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10156                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10157                         }
10158                 } else {
10159                         asoc->burst_limit_applied = 0;
10160                 }
10161         }
10162         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10163                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10164         }
10165         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10166             tot_out);
10167
10168         /*-
10169          * Now we need to clean up the control chunk chain if a ECNE is on
10170          * it. It must be marked as UNSENT again so next call will continue
10171          * to send it until such time that we get a CWR, to remove it.
10172          */
10173         if (stcb->asoc.ecn_echo_cnt_onq)
10174                 sctp_fix_ecn_echo(asoc);
10175
10176         if (stcb->asoc.trigger_reset) {
10177                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10178                         goto do_it_again;
10179                 }
10180         }
10181         return;
10182 }
10183
10184 int
10185 sctp_output(
10186     struct sctp_inpcb *inp,
10187     struct mbuf *m,
10188     struct sockaddr *addr,
10189     struct mbuf *control,
10190     struct thread *p,
10191     int flags)
10192 {
10193         if (inp == NULL) {
10194                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10195                 return (EINVAL);
10196         }
10197
10198         if (inp->sctp_socket == NULL) {
10199                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10200                 return (EINVAL);
10201         }
10202         return (sctp_sosend(inp->sctp_socket,
10203             addr,
10204             (struct uio *)NULL,
10205             m,
10206             control,
10207             flags, p
10208             ));
10209 }
10210
10211 void
10212 send_forward_tsn(struct sctp_tcb *stcb,
10213     struct sctp_association *asoc)
10214 {
10215         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10216         struct sctp_forward_tsn_chunk *fwdtsn;
10217         struct sctp_strseq *strseq;
10218         struct sctp_strseq_mid *strseq_m;
10219         uint32_t advance_peer_ack_point;
10220         unsigned int cnt_of_space, i, ovh;
10221         unsigned int space_needed;
10222         unsigned int cnt_of_skipped = 0;
10223
10224         SCTP_TCB_LOCK_ASSERT(stcb);
10225         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10226                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10227                         /* mark it to unsent */
10228                         chk->sent = SCTP_DATAGRAM_UNSENT;
10229                         chk->snd_count = 0;
10230                         /* Do we correct its output location? */
10231                         if (chk->whoTo) {
10232                                 sctp_free_remote_addr(chk->whoTo);
10233                                 chk->whoTo = NULL;
10234                         }
10235                         goto sctp_fill_in_rest;
10236                 }
10237         }
10238         /* Ok if we reach here we must build one */
10239         sctp_alloc_a_chunk(stcb, chk);
10240         if (chk == NULL) {
10241                 return;
10242         }
10243         asoc->fwd_tsn_cnt++;
10244         chk->copy_by_ref = 0;
10245         /*
10246          * We don't do the old thing here since this is used not for on-wire
10247          * but to tell if we are sending a fwd-tsn by the stack during
10248          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10249          */
10250         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10251         chk->rec.chunk_id.can_take_data = 0;
10252         chk->flags = 0;
10253         chk->asoc = asoc;
10254         chk->whoTo = NULL;
10255         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10256         if (chk->data == NULL) {
10257                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10258                 return;
10259         }
10260         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10261         chk->sent = SCTP_DATAGRAM_UNSENT;
10262         chk->snd_count = 0;
10263         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10264         asoc->ctrl_queue_cnt++;
10265 sctp_fill_in_rest:
10266         /*-
10267          * Here we go through and fill out the part that deals with
10268          * stream/seq of the ones we skip.
10269          */
10270         SCTP_BUF_LEN(chk->data) = 0;
10271         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10272                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10273                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10274                         /* no more to look at */
10275                         break;
10276                 }
10277                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10278                         /* We don't report these */
10279                         continue;
10280                 }
10281                 cnt_of_skipped++;
10282         }
10283         if (asoc->idata_supported) {
10284                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10285                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10286         } else {
10287                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10288                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10289         }
10290         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10291
10292         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10293                 ovh = SCTP_MIN_OVERHEAD;
10294         } else {
10295                 ovh = SCTP_MIN_V4_OVERHEAD;
10296         }
10297         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10298                 /* trim to a mtu size */
10299                 cnt_of_space = asoc->smallest_mtu - ovh;
10300         }
10301         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10302                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10303                     0xff, 0, cnt_of_skipped,
10304                     asoc->advanced_peer_ack_point);
10305         }
10306         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10307         if (cnt_of_space < space_needed) {
10308                 /*-
10309                  * ok we must trim down the chunk by lowering the
10310                  * advance peer ack point.
10311                  */
10312                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10313                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10314                             0xff, 0xff, cnt_of_space,
10315                             space_needed);
10316                 }
10317                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10318                 if (asoc->idata_supported) {
10319                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10320                 } else {
10321                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10322                 }
10323                 /*-
10324                  * Go through and find the TSN that will be the one
10325                  * we report.
10326                  */
10327                 at = TAILQ_FIRST(&asoc->sent_queue);
10328                 if (at != NULL) {
10329                         for (i = 0; i < cnt_of_skipped; i++) {
10330                                 tp1 = TAILQ_NEXT(at, sctp_next);
10331                                 if (tp1 == NULL) {
10332                                         break;
10333                                 }
10334                                 at = tp1;
10335                         }
10336                 }
10337                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10338                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10339                             0xff, cnt_of_skipped, at->rec.data.tsn,
10340                             asoc->advanced_peer_ack_point);
10341                 }
10342                 last = at;
10343                 /*-
10344                  * last now points to last one I can report, update
10345                  * peer ack point
10346                  */
10347                 if (last) {
10348                         advance_peer_ack_point = last->rec.data.tsn;
10349                 }
10350                 if (asoc->idata_supported) {
10351                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10352                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10353                 } else {
10354                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10355                             cnt_of_skipped * sizeof(struct sctp_strseq);
10356                 }
10357         }
10358         chk->send_size = space_needed;
10359         /* Setup the chunk */
10360         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10361         fwdtsn->ch.chunk_length = htons(chk->send_size);
10362         fwdtsn->ch.chunk_flags = 0;
10363         if (asoc->idata_supported) {
10364                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10365         } else {
10366                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10367         }
10368         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10369         SCTP_BUF_LEN(chk->data) = chk->send_size;
10370         fwdtsn++;
10371         /*-
10372          * Move pointer to after the fwdtsn and transfer to the
10373          * strseq pointer.
10374          */
10375         if (asoc->idata_supported) {
10376                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10377                 strseq = NULL;
10378         } else {
10379                 strseq = (struct sctp_strseq *)fwdtsn;
10380                 strseq_m = NULL;
10381         }
10382         /*-
10383          * Now populate the strseq list. This is done blindly
10384          * without pulling out duplicate stream info. This is
10385          * inefficent but won't harm the process since the peer will
10386          * look at these in sequence and will thus release anything.
10387          * It could mean we exceed the PMTU and chop off some that
10388          * we could have included.. but this is unlikely (aka 1432/4
10389          * would mean 300+ stream seq's would have to be reported in
10390          * one FWD-TSN. With a bit of work we can later FIX this to
10391          * optimize and pull out duplicates.. but it does add more
10392          * overhead. So for now... not!
10393          */
10394         i = 0;
10395         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10396                 if (i >= cnt_of_skipped) {
10397                         break;
10398                 }
10399                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10400                         /* We don't report these */
10401                         continue;
10402                 }
10403                 if (at->rec.data.tsn == advance_peer_ack_point) {
10404                         at->rec.data.fwd_tsn_cnt = 0;
10405                 }
10406                 if (asoc->idata_supported) {
10407                         strseq_m->sid = htons(at->rec.data.sid);
10408                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10409                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10410                         } else {
10411                                 strseq_m->flags = 0;
10412                         }
10413                         strseq_m->mid = htonl(at->rec.data.mid);
10414                         strseq_m++;
10415                 } else {
10416                         strseq->sid = htons(at->rec.data.sid);
10417                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10418                         strseq++;
10419                 }
10420                 i++;
10421         }
10422         return;
10423 }
10424
10425 void
10426 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10427 {
10428         /*-
10429          * Queue up a SACK or NR-SACK in the control queue.
10430          * We must first check to see if a SACK or NR-SACK is
10431          * somehow on the control queue.
10432          * If so, we will take and and remove the old one.
10433          */
10434         struct sctp_association *asoc;
10435         struct sctp_tmit_chunk *chk, *a_chk;
10436         struct sctp_sack_chunk *sack;
10437         struct sctp_nr_sack_chunk *nr_sack;
10438         struct sctp_gap_ack_block *gap_descriptor;
10439         const struct sack_track *selector;
10440         int mergeable = 0;
10441         int offset;
10442         caddr_t limit;
10443         uint32_t *dup;
10444         int limit_reached = 0;
10445         unsigned int i, siz, j;
10446         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10447         int num_dups = 0;
10448         int space_req;
10449         uint32_t highest_tsn;
10450         uint8_t flags;
10451         uint8_t type;
10452         uint8_t tsn_map;
10453
10454         if (stcb->asoc.nrsack_supported == 1) {
10455                 type = SCTP_NR_SELECTIVE_ACK;
10456         } else {
10457                 type = SCTP_SELECTIVE_ACK;
10458         }
10459         a_chk = NULL;
10460         asoc = &stcb->asoc;
10461         SCTP_TCB_LOCK_ASSERT(stcb);
10462         if (asoc->last_data_chunk_from == NULL) {
10463                 /* Hmm we never received anything */
10464                 return;
10465         }
10466         sctp_slide_mapping_arrays(stcb);
10467         sctp_set_rwnd(stcb, asoc);
10468         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10469                 if (chk->rec.chunk_id.id == type) {
10470                         /* Hmm, found a sack already on queue, remove it */
10471                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10472                         asoc->ctrl_queue_cnt--;
10473                         a_chk = chk;
10474                         if (a_chk->data) {
10475                                 sctp_m_freem(a_chk->data);
10476                                 a_chk->data = NULL;
10477                         }
10478                         if (a_chk->whoTo) {
10479                                 sctp_free_remote_addr(a_chk->whoTo);
10480                                 a_chk->whoTo = NULL;
10481                         }
10482                         break;
10483                 }
10484         }
10485         if (a_chk == NULL) {
10486                 sctp_alloc_a_chunk(stcb, a_chk);
10487                 if (a_chk == NULL) {
10488                         /* No memory so we drop the idea, and set a timer */
10489                         if (stcb->asoc.delayed_ack) {
10490                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10491                                     stcb->sctp_ep, stcb, NULL,
10492                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10493                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10494                                     stcb->sctp_ep, stcb, NULL);
10495                         } else {
10496                                 stcb->asoc.send_sack = 1;
10497                         }
10498                         return;
10499                 }
10500                 a_chk->copy_by_ref = 0;
10501                 a_chk->rec.chunk_id.id = type;
10502                 a_chk->rec.chunk_id.can_take_data = 1;
10503         }
10504         /* Clear our pkt counts */
10505         asoc->data_pkts_seen = 0;
10506
10507         a_chk->flags = 0;
10508         a_chk->asoc = asoc;
10509         a_chk->snd_count = 0;
10510         a_chk->send_size = 0;   /* fill in later */
10511         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10512         a_chk->whoTo = NULL;
10513
10514         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10515                 /*-
10516                  * Ok, the destination for the SACK is unreachable, lets see if
10517                  * we can select an alternate to asoc->last_data_chunk_from
10518                  */
10519                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10520                 if (a_chk->whoTo == NULL) {
10521                         /* Nope, no alternate */
10522                         a_chk->whoTo = asoc->last_data_chunk_from;
10523                 }
10524         } else {
10525                 a_chk->whoTo = asoc->last_data_chunk_from;
10526         }
10527         if (a_chk->whoTo) {
10528                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10529         }
10530         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10531                 highest_tsn = asoc->highest_tsn_inside_map;
10532         } else {
10533                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10534         }
10535         if (highest_tsn == asoc->cumulative_tsn) {
10536                 /* no gaps */
10537                 if (type == SCTP_SELECTIVE_ACK) {
10538                         space_req = sizeof(struct sctp_sack_chunk);
10539                 } else {
10540                         space_req = sizeof(struct sctp_nr_sack_chunk);
10541                 }
10542         } else {
10543                 /* gaps get a cluster */
10544                 space_req = MCLBYTES;
10545         }
10546         /* Ok now lets formulate a MBUF with our sack */
10547         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10548         if ((a_chk->data == NULL) ||
10549             (a_chk->whoTo == NULL)) {
10550                 /* rats, no mbuf memory */
10551                 if (a_chk->data) {
10552                         /* was a problem with the destination */
10553                         sctp_m_freem(a_chk->data);
10554                         a_chk->data = NULL;
10555                 }
10556                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10557                 /* sa_ignore NO_NULL_CHK */
10558                 if (stcb->asoc.delayed_ack) {
10559                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10560                             stcb->sctp_ep, stcb, NULL,
10561                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10562                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10563                             stcb->sctp_ep, stcb, NULL);
10564                 } else {
10565                         stcb->asoc.send_sack = 1;
10566                 }
10567                 return;
10568         }
10569         /* ok, lets go through and fill it in */
10570         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10571         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10572         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10573                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10574         }
10575         limit = mtod(a_chk->data, caddr_t);
10576         limit += space;
10577
10578         flags = 0;
10579
10580         if ((asoc->sctp_cmt_on_off > 0) &&
10581             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10582                 /*-
10583                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10584                  * received, then set high bit to 1, else 0. Reset
10585                  * pkts_rcvd.
10586                  */
10587                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10588                 asoc->cmt_dac_pkts_rcvd = 0;
10589         }
10590 #ifdef SCTP_ASOCLOG_OF_TSNS
10591         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10592         stcb->asoc.cumack_log_atsnt++;
10593         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10594                 stcb->asoc.cumack_log_atsnt = 0;
10595         }
10596 #endif
10597         /* reset the readers interpretation */
10598         stcb->freed_by_sorcv_sincelast = 0;
10599
10600         if (type == SCTP_SELECTIVE_ACK) {
10601                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10602                 nr_sack = NULL;
10603                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10604                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10605                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10606                 } else {
10607                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10608                 }
10609         } else {
10610                 sack = NULL;
10611                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10612                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10613                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10614                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10615                 } else {
10616                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10617                 }
10618         }
10619
10620         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10621                 offset = 1;
10622         } else {
10623                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10624         }
10625         if (((type == SCTP_SELECTIVE_ACK) &&
10626             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10627             ((type == SCTP_NR_SELECTIVE_ACK) &&
10628             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10629                 /* we have a gap .. maybe */
10630                 for (i = 0; i < siz; i++) {
10631                         tsn_map = asoc->mapping_array[i];
10632                         if (type == SCTP_SELECTIVE_ACK) {
10633                                 tsn_map |= asoc->nr_mapping_array[i];
10634                         }
10635                         if (i == 0) {
10636                                 /*
10637                                  * Clear all bits corresponding to TSNs
10638                                  * smaller or equal to the cumulative TSN.
10639                                  */
10640                                 tsn_map &= (~0U << (1 - offset));
10641                         }
10642                         selector = &sack_array[tsn_map];
10643                         if (mergeable && selector->right_edge) {
10644                                 /*
10645                                  * Backup, left and right edges were ok to
10646                                  * merge.
10647                                  */
10648                                 num_gap_blocks--;
10649                                 gap_descriptor--;
10650                         }
10651                         if (selector->num_entries == 0)
10652                                 mergeable = 0;
10653                         else {
10654                                 for (j = 0; j < selector->num_entries; j++) {
10655                                         if (mergeable && selector->right_edge) {
10656                                                 /*
10657                                                  * do a merge by NOT setting
10658                                                  * the left side
10659                                                  */
10660                                                 mergeable = 0;
10661                                         } else {
10662                                                 /*
10663                                                  * no merge, set the left
10664                                                  * side
10665                                                  */
10666                                                 mergeable = 0;
10667                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10668                                         }
10669                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10670                                         num_gap_blocks++;
10671                                         gap_descriptor++;
10672                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10673                                                 /* no more room */
10674                                                 limit_reached = 1;
10675                                                 break;
10676                                         }
10677                                 }
10678                                 if (selector->left_edge) {
10679                                         mergeable = 1;
10680                                 }
10681                         }
10682                         if (limit_reached) {
10683                                 /* Reached the limit stop */
10684                                 break;
10685                         }
10686                         offset += 8;
10687                 }
10688         }
10689         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10690             (limit_reached == 0)) {
10691                 mergeable = 0;
10692
10693                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10694                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10695                 } else {
10696                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10697                 }
10698
10699                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10700                         offset = 1;
10701                 } else {
10702                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10703                 }
10704                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10705                         /* we have a gap .. maybe */
10706                         for (i = 0; i < siz; i++) {
10707                                 tsn_map = asoc->nr_mapping_array[i];
10708                                 if (i == 0) {
10709                                         /*
10710                                          * Clear all bits corresponding to
10711                                          * TSNs smaller or equal to the
10712                                          * cumulative TSN.
10713                                          */
10714                                         tsn_map &= (~0U << (1 - offset));
10715                                 }
10716                                 selector = &sack_array[tsn_map];
10717                                 if (mergeable && selector->right_edge) {
10718                                         /*
10719                                          * Backup, left and right edges were
10720                                          * ok to merge.
10721                                          */
10722                                         num_nr_gap_blocks--;
10723                                         gap_descriptor--;
10724                                 }
10725                                 if (selector->num_entries == 0)
10726                                         mergeable = 0;
10727                                 else {
10728                                         for (j = 0; j < selector->num_entries; j++) {
10729                                                 if (mergeable && selector->right_edge) {
10730                                                         /*
10731                                                          * do a merge by NOT
10732                                                          * setting the left
10733                                                          * side
10734                                                          */
10735                                                         mergeable = 0;
10736                                                 } else {
10737                                                         /*
10738                                                          * no merge, set the
10739                                                          * left side
10740                                                          */
10741                                                         mergeable = 0;
10742                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10743                                                 }
10744                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10745                                                 num_nr_gap_blocks++;
10746                                                 gap_descriptor++;
10747                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10748                                                         /* no more room */
10749                                                         limit_reached = 1;
10750                                                         break;
10751                                                 }
10752                                         }
10753                                         if (selector->left_edge) {
10754                                                 mergeable = 1;
10755                                         }
10756                                 }
10757                                 if (limit_reached) {
10758                                         /* Reached the limit stop */
10759                                         break;
10760                                 }
10761                                 offset += 8;
10762                         }
10763                 }
10764         }
10765         /* now we must add any dups we are going to report. */
10766         if ((limit_reached == 0) && (asoc->numduptsns)) {
10767                 dup = (uint32_t *)gap_descriptor;
10768                 for (i = 0; i < asoc->numduptsns; i++) {
10769                         *dup = htonl(asoc->dup_tsns[i]);
10770                         dup++;
10771                         num_dups++;
10772                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10773                                 /* no more room */
10774                                 break;
10775                         }
10776                 }
10777                 asoc->numduptsns = 0;
10778         }
10779         /*
10780          * now that the chunk is prepared queue it to the control chunk
10781          * queue.
10782          */
10783         if (type == SCTP_SELECTIVE_ACK) {
10784                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10785                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10786                     num_dups * sizeof(int32_t));
10787                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10788                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10789                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10790                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10791                 sack->sack.num_dup_tsns = htons(num_dups);
10792                 sack->ch.chunk_type = type;
10793                 sack->ch.chunk_flags = flags;
10794                 sack->ch.chunk_length = htons(a_chk->send_size);
10795         } else {
10796                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10797                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10798                     num_dups * sizeof(int32_t));
10799                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10800                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10801                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10802                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10803                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10804                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10805                 nr_sack->nr_sack.reserved = 0;
10806                 nr_sack->ch.chunk_type = type;
10807                 nr_sack->ch.chunk_flags = flags;
10808                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10809         }
10810         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10811         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10812         asoc->ctrl_queue_cnt++;
10813         asoc->send_sack = 0;
10814         SCTP_STAT_INCR(sctps_sendsacks);
10815         return;
10816 }
10817
10818 void
10819 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10820 {
10821         struct mbuf *m_abort, *m, *m_last;
10822         struct mbuf *m_out, *m_end = NULL;
10823         struct sctp_abort_chunk *abort;
10824         struct sctp_auth_chunk *auth = NULL;
10825         struct sctp_nets *net;
10826         uint32_t vtag;
10827         uint32_t auth_offset = 0;
10828         int error;
10829         uint16_t cause_len, chunk_len, padding_len;
10830
10831         SCTP_TCB_LOCK_ASSERT(stcb);
10832         /*-
10833          * Add an AUTH chunk, if chunk requires it and save the offset into
10834          * the chain for AUTH
10835          */
10836         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10837             stcb->asoc.peer_auth_chunks)) {
10838                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10839                     stcb, SCTP_ABORT_ASSOCIATION);
10840                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10841         } else {
10842                 m_out = NULL;
10843         }
10844         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10845         if (m_abort == NULL) {
10846                 if (m_out) {
10847                         sctp_m_freem(m_out);
10848                 }
10849                 if (operr) {
10850                         sctp_m_freem(operr);
10851                 }
10852                 return;
10853         }
10854         /* link in any error */
10855         SCTP_BUF_NEXT(m_abort) = operr;
10856         cause_len = 0;
10857         m_last = NULL;
10858         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10859                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10860                 if (SCTP_BUF_NEXT(m) == NULL) {
10861                         m_last = m;
10862                 }
10863         }
10864         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10865         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10866         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10867         if (m_out == NULL) {
10868                 /* NO Auth chunk prepended, so reserve space in front */
10869                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10870                 m_out = m_abort;
10871         } else {
10872                 /* Put AUTH chunk at the front of the chain */
10873                 SCTP_BUF_NEXT(m_end) = m_abort;
10874         }
10875         if (stcb->asoc.alternate) {
10876                 net = stcb->asoc.alternate;
10877         } else {
10878                 net = stcb->asoc.primary_destination;
10879         }
10880         /* Fill in the ABORT chunk header. */
10881         abort = mtod(m_abort, struct sctp_abort_chunk *);
10882         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10883         if (stcb->asoc.peer_vtag == 0) {
10884                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10885                 vtag = stcb->asoc.my_vtag;
10886                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10887         } else {
10888                 vtag = stcb->asoc.peer_vtag;
10889                 abort->ch.chunk_flags = 0;
10890         }
10891         abort->ch.chunk_length = htons(chunk_len);
10892         /* Add padding, if necessary. */
10893         if (padding_len > 0) {
10894                 if ((m_last == NULL) ||
10895                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10896                         sctp_m_freem(m_out);
10897                         return;
10898                 }
10899         }
10900         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10901             (struct sockaddr *)&net->ro._l_addr,
10902             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10903             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10904             stcb->asoc.primary_destination->port, NULL,
10905             0, 0,
10906             so_locked))) {
10907                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10908                 if (error == ENOBUFS) {
10909                         stcb->asoc.ifp_had_enobuf = 1;
10910                         SCTP_STAT_INCR(sctps_lowlevelerr);
10911                 }
10912         } else {
10913                 stcb->asoc.ifp_had_enobuf = 0;
10914         }
10915         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10916 }
10917
10918 void
10919 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10920     struct sctp_nets *net,
10921     int reflect_vtag)
10922 {
10923         /* formulate and SEND a SHUTDOWN-COMPLETE */
10924         struct mbuf *m_shutdown_comp;
10925         struct sctp_shutdown_complete_chunk *shutdown_complete;
10926         uint32_t vtag;
10927         int error;
10928         uint8_t flags;
10929
10930         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10931         if (m_shutdown_comp == NULL) {
10932                 /* no mbuf's */
10933                 return;
10934         }
10935         if (reflect_vtag) {
10936                 flags = SCTP_HAD_NO_TCB;
10937                 vtag = stcb->asoc.my_vtag;
10938         } else {
10939                 flags = 0;
10940                 vtag = stcb->asoc.peer_vtag;
10941         }
10942         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10943         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10944         shutdown_complete->ch.chunk_flags = flags;
10945         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10946         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10947         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10948             (struct sockaddr *)&net->ro._l_addr,
10949             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10950             stcb->sctp_ep->sctp_lport, stcb->rport,
10951             htonl(vtag),
10952             net->port, NULL,
10953             0, 0,
10954             SCTP_SO_NOT_LOCKED))) {
10955                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10956                 if (error == ENOBUFS) {
10957                         stcb->asoc.ifp_had_enobuf = 1;
10958                         SCTP_STAT_INCR(sctps_lowlevelerr);
10959                 }
10960         } else {
10961                 stcb->asoc.ifp_had_enobuf = 0;
10962         }
10963         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10964         return;
10965 }
10966
10967 static void
10968 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10969     struct sctphdr *sh, uint32_t vtag,
10970     uint8_t type, struct mbuf *cause,
10971     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10972     uint32_t vrf_id, uint16_t port)
10973 {
10974         struct mbuf *o_pak;
10975         struct mbuf *mout;
10976         struct sctphdr *shout;
10977         struct sctp_chunkhdr *ch;
10978 #if defined(INET) || defined(INET6)
10979         struct udphdr *udp;
10980 #endif
10981         int ret, len, cause_len, padding_len;
10982 #ifdef INET
10983         struct sockaddr_in *src_sin, *dst_sin;
10984         struct ip *ip;
10985 #endif
10986 #ifdef INET6
10987         struct sockaddr_in6 *src_sin6, *dst_sin6;
10988         struct ip6_hdr *ip6;
10989 #endif
10990
10991         /* Compute the length of the cause and add final padding. */
10992         cause_len = 0;
10993         if (cause != NULL) {
10994                 struct mbuf *m_at, *m_last = NULL;
10995
10996                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10997                         if (SCTP_BUF_NEXT(m_at) == NULL)
10998                                 m_last = m_at;
10999                         cause_len += SCTP_BUF_LEN(m_at);
11000                 }
11001                 padding_len = cause_len % 4;
11002                 if (padding_len != 0) {
11003                         padding_len = 4 - padding_len;
11004                 }
11005                 if (padding_len != 0) {
11006                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11007                                 sctp_m_freem(cause);
11008                                 return;
11009                         }
11010                 }
11011         } else {
11012                 padding_len = 0;
11013         }
11014         /* Get an mbuf for the header. */
11015         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11016         switch (dst->sa_family) {
11017 #ifdef INET
11018         case AF_INET:
11019                 len += sizeof(struct ip);
11020                 break;
11021 #endif
11022 #ifdef INET6
11023         case AF_INET6:
11024                 len += sizeof(struct ip6_hdr);
11025                 break;
11026 #endif
11027         default:
11028                 break;
11029         }
11030 #if defined(INET) || defined(INET6)
11031         if (port) {
11032                 len += sizeof(struct udphdr);
11033         }
11034 #endif
11035         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11036         if (mout == NULL) {
11037                 if (cause) {
11038                         sctp_m_freem(cause);
11039                 }
11040                 return;
11041         }
11042         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11043         SCTP_BUF_LEN(mout) = len;
11044         SCTP_BUF_NEXT(mout) = cause;
11045         M_SETFIB(mout, fibnum);
11046         mout->m_pkthdr.flowid = mflowid;
11047         M_HASHTYPE_SET(mout, mflowtype);
11048 #ifdef INET
11049         ip = NULL;
11050 #endif
11051 #ifdef INET6
11052         ip6 = NULL;
11053 #endif
11054         switch (dst->sa_family) {
11055 #ifdef INET
11056         case AF_INET:
11057                 src_sin = (struct sockaddr_in *)src;
11058                 dst_sin = (struct sockaddr_in *)dst;
11059                 ip = mtod(mout, struct ip *);
11060                 ip->ip_v = IPVERSION;
11061                 ip->ip_hl = (sizeof(struct ip) >> 2);
11062                 ip->ip_tos = 0;
11063                 ip->ip_off = htons(IP_DF);
11064                 ip_fillid(ip);
11065                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11066                 if (port) {
11067                         ip->ip_p = IPPROTO_UDP;
11068                 } else {
11069                         ip->ip_p = IPPROTO_SCTP;
11070                 }
11071                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11072                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11073                 ip->ip_sum = 0;
11074                 len = sizeof(struct ip);
11075                 shout = (struct sctphdr *)((caddr_t)ip + len);
11076                 break;
11077 #endif
11078 #ifdef INET6
11079         case AF_INET6:
11080                 src_sin6 = (struct sockaddr_in6 *)src;
11081                 dst_sin6 = (struct sockaddr_in6 *)dst;
11082                 ip6 = mtod(mout, struct ip6_hdr *);
11083                 ip6->ip6_flow = htonl(0x60000000);
11084                 if (V_ip6_auto_flowlabel) {
11085                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11086                 }
11087                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11088                 if (port) {
11089                         ip6->ip6_nxt = IPPROTO_UDP;
11090                 } else {
11091                         ip6->ip6_nxt = IPPROTO_SCTP;
11092                 }
11093                 ip6->ip6_src = dst_sin6->sin6_addr;
11094                 ip6->ip6_dst = src_sin6->sin6_addr;
11095                 len = sizeof(struct ip6_hdr);
11096                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11097                 break;
11098 #endif
11099         default:
11100                 len = 0;
11101                 shout = mtod(mout, struct sctphdr *);
11102                 break;
11103         }
11104 #if defined(INET) || defined(INET6)
11105         if (port) {
11106                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11107                         sctp_m_freem(mout);
11108                         return;
11109                 }
11110                 udp = (struct udphdr *)shout;
11111                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11112                 udp->uh_dport = port;
11113                 udp->uh_sum = 0;
11114                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11115                     sizeof(struct sctphdr) +
11116                     sizeof(struct sctp_chunkhdr) +
11117                     cause_len + padding_len));
11118                 len += sizeof(struct udphdr);
11119                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11120         } else {
11121                 udp = NULL;
11122         }
11123 #endif
11124         shout->src_port = sh->dest_port;
11125         shout->dest_port = sh->src_port;
11126         shout->checksum = 0;
11127         if (vtag) {
11128                 shout->v_tag = htonl(vtag);
11129         } else {
11130                 shout->v_tag = sh->v_tag;
11131         }
11132         len += sizeof(struct sctphdr);
11133         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11134         ch->chunk_type = type;
11135         if (vtag) {
11136                 ch->chunk_flags = 0;
11137         } else {
11138                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11139         }
11140         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11141         len += sizeof(struct sctp_chunkhdr);
11142         len += cause_len + padding_len;
11143
11144         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11145                 sctp_m_freem(mout);
11146                 return;
11147         }
11148         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11149         switch (dst->sa_family) {
11150 #ifdef INET
11151         case AF_INET:
11152                 if (port) {
11153                         if (V_udp_cksum) {
11154                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11155                         } else {
11156                                 udp->uh_sum = 0;
11157                         }
11158                 }
11159                 ip->ip_len = htons(len);
11160                 if (port) {
11161                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11162                         SCTP_STAT_INCR(sctps_sendswcrc);
11163                         if (V_udp_cksum) {
11164                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11165                         }
11166                 } else {
11167                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11168                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11169                         SCTP_STAT_INCR(sctps_sendhwcrc);
11170                 }
11171 #ifdef SCTP_PACKET_LOGGING
11172                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11173                         sctp_packet_log(o_pak);
11174                 }
11175 #endif
11176                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11177                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11178                 break;
11179 #endif
11180 #ifdef INET6
11181         case AF_INET6:
11182                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11183                 if (port) {
11184                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11185                         SCTP_STAT_INCR(sctps_sendswcrc);
11186                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11187                                 udp->uh_sum = 0xffff;
11188                         }
11189                 } else {
11190                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11191                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11192                         SCTP_STAT_INCR(sctps_sendhwcrc);
11193                 }
11194 #ifdef SCTP_PACKET_LOGGING
11195                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11196                         sctp_packet_log(o_pak);
11197                 }
11198 #endif
11199                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11200                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11201                 break;
11202 #endif
11203         default:
11204                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11205                     dst->sa_family);
11206                 sctp_m_freem(mout);
11207                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11208                 return;
11209         }
11210         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11211         if (port) {
11212                 UDPSTAT_INC(udps_opackets);
11213         }
11214         SCTP_STAT_INCR(sctps_sendpackets);
11215         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11216         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11217         if (ret) {
11218                 SCTP_STAT_INCR(sctps_senderrors);
11219         }
11220         return;
11221 }
11222
11223 void
11224 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11225     struct sctphdr *sh,
11226     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11227     uint32_t vrf_id, uint16_t port)
11228 {
11229         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11230             mflowtype, mflowid, fibnum,
11231             vrf_id, port);
11232 }
11233
11234 void
11235 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11236 {
11237         struct sctp_tmit_chunk *chk;
11238         struct sctp_heartbeat_chunk *hb;
11239         struct timeval now;
11240
11241         SCTP_TCB_LOCK_ASSERT(stcb);
11242         if (net == NULL) {
11243                 return;
11244         }
11245         (void)SCTP_GETTIME_TIMEVAL(&now);
11246         switch (net->ro._l_addr.sa.sa_family) {
11247 #ifdef INET
11248         case AF_INET:
11249                 break;
11250 #endif
11251 #ifdef INET6
11252         case AF_INET6:
11253                 break;
11254 #endif
11255         default:
11256                 return;
11257         }
11258         sctp_alloc_a_chunk(stcb, chk);
11259         if (chk == NULL) {
11260                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11261                 return;
11262         }
11263
11264         chk->copy_by_ref = 0;
11265         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11266         chk->rec.chunk_id.can_take_data = 1;
11267         chk->flags = 0;
11268         chk->asoc = &stcb->asoc;
11269         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11270
11271         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11272         if (chk->data == NULL) {
11273                 sctp_free_a_chunk(stcb, chk, so_locked);
11274                 return;
11275         }
11276         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11277         SCTP_BUF_LEN(chk->data) = chk->send_size;
11278         chk->sent = SCTP_DATAGRAM_UNSENT;
11279         chk->snd_count = 0;
11280         chk->whoTo = net;
11281         atomic_add_int(&chk->whoTo->ref_count, 1);
11282         /* Now we have a mbuf that we can fill in with the details */
11283         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11284         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11285         /* fill out chunk header */
11286         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11287         hb->ch.chunk_flags = 0;
11288         hb->ch.chunk_length = htons(chk->send_size);
11289         /* Fill out hb parameter */
11290         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11291         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11292         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11293         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11294         /* Did our user request this one, put it in */
11295         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11296         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11297         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11298                 /*
11299                  * we only take from the entropy pool if the address is not
11300                  * confirmed.
11301                  */
11302                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11303                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11304         } else {
11305                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11306                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11307         }
11308         switch (net->ro._l_addr.sa.sa_family) {
11309 #ifdef INET
11310         case AF_INET:
11311                 memcpy(hb->heartbeat.hb_info.address,
11312                     &net->ro._l_addr.sin.sin_addr,
11313                     sizeof(net->ro._l_addr.sin.sin_addr));
11314                 break;
11315 #endif
11316 #ifdef INET6
11317         case AF_INET6:
11318                 memcpy(hb->heartbeat.hb_info.address,
11319                     &net->ro._l_addr.sin6.sin6_addr,
11320                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11321                 break;
11322 #endif
11323         default:
11324                 if (chk->data) {
11325                         sctp_m_freem(chk->data);
11326                         chk->data = NULL;
11327                 }
11328                 sctp_free_a_chunk(stcb, chk, so_locked);
11329                 return;
11330                 break;
11331         }
11332         net->hb_responded = 0;
11333         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11334         stcb->asoc.ctrl_queue_cnt++;
11335         SCTP_STAT_INCR(sctps_sendheartbeat);
11336         return;
11337 }
11338
11339 void
11340 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11341     uint32_t high_tsn)
11342 {
11343         struct sctp_association *asoc;
11344         struct sctp_ecne_chunk *ecne;
11345         struct sctp_tmit_chunk *chk;
11346
11347         if (net == NULL) {
11348                 return;
11349         }
11350         asoc = &stcb->asoc;
11351         SCTP_TCB_LOCK_ASSERT(stcb);
11352         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11353                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11354                         /* found a previous ECN_ECHO update it if needed */
11355                         uint32_t cnt, ctsn;
11356
11357                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11358                         ctsn = ntohl(ecne->tsn);
11359                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11360                                 ecne->tsn = htonl(high_tsn);
11361                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11362                         }
11363                         cnt = ntohl(ecne->num_pkts_since_cwr);
11364                         cnt++;
11365                         ecne->num_pkts_since_cwr = htonl(cnt);
11366                         return;
11367                 }
11368         }
11369         /* nope could not find one to update so we must build one */
11370         sctp_alloc_a_chunk(stcb, chk);
11371         if (chk == NULL) {
11372                 return;
11373         }
11374         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11375         chk->copy_by_ref = 0;
11376         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11377         chk->rec.chunk_id.can_take_data = 0;
11378         chk->flags = 0;
11379         chk->asoc = &stcb->asoc;
11380         chk->send_size = sizeof(struct sctp_ecne_chunk);
11381         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11382         if (chk->data == NULL) {
11383                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11384                 return;
11385         }
11386         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11387         SCTP_BUF_LEN(chk->data) = chk->send_size;
11388         chk->sent = SCTP_DATAGRAM_UNSENT;
11389         chk->snd_count = 0;
11390         chk->whoTo = net;
11391         atomic_add_int(&chk->whoTo->ref_count, 1);
11392
11393         stcb->asoc.ecn_echo_cnt_onq++;
11394         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11395         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11396         ecne->ch.chunk_flags = 0;
11397         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11398         ecne->tsn = htonl(high_tsn);
11399         ecne->num_pkts_since_cwr = htonl(1);
11400         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11401         asoc->ctrl_queue_cnt++;
11402 }
11403
11404 void
11405 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11406     struct mbuf *m, int len, int iphlen, int bad_crc)
11407 {
11408         struct sctp_association *asoc;
11409         struct sctp_pktdrop_chunk *drp;
11410         struct sctp_tmit_chunk *chk;
11411         uint8_t *datap;
11412         int was_trunc = 0;
11413         int fullsz = 0;
11414         long spc;
11415         int offset;
11416         struct sctp_chunkhdr *ch, chunk_buf;
11417         unsigned int chk_length;
11418
11419         if (!stcb) {
11420                 return;
11421         }
11422         asoc = &stcb->asoc;
11423         SCTP_TCB_LOCK_ASSERT(stcb);
11424         if (asoc->pktdrop_supported == 0) {
11425                 /*-
11426                  * peer must declare support before I send one.
11427                  */
11428                 return;
11429         }
11430         if (stcb->sctp_socket == NULL) {
11431                 return;
11432         }
11433         sctp_alloc_a_chunk(stcb, chk);
11434         if (chk == NULL) {
11435                 return;
11436         }
11437         chk->copy_by_ref = 0;
11438         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11439         chk->rec.chunk_id.can_take_data = 1;
11440         chk->flags = 0;
11441         len -= iphlen;
11442         chk->send_size = len;
11443         /* Validate that we do not have an ABORT in here. */
11444         offset = iphlen + sizeof(struct sctphdr);
11445         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11446             sizeof(*ch), (uint8_t *)&chunk_buf);
11447         while (ch != NULL) {
11448                 chk_length = ntohs(ch->chunk_length);
11449                 if (chk_length < sizeof(*ch)) {
11450                         /* break to abort land */
11451                         break;
11452                 }
11453                 switch (ch->chunk_type) {
11454                 case SCTP_PACKET_DROPPED:
11455                 case SCTP_ABORT_ASSOCIATION:
11456                 case SCTP_INITIATION_ACK:
11457                         /**
11458                          * We don't respond with an PKT-DROP to an ABORT
11459                          * or PKT-DROP. We also do not respond to an
11460                          * INIT-ACK, because we can't know if the initiation
11461                          * tag is correct or not.
11462                          */
11463                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11464                         return;
11465                 default:
11466                         break;
11467                 }
11468                 offset += SCTP_SIZE32(chk_length);
11469                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11470                     sizeof(*ch), (uint8_t *)&chunk_buf);
11471         }
11472
11473         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11474             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11475                 /*
11476                  * only send 1 mtu worth, trim off the excess on the end.
11477                  */
11478                 fullsz = len;
11479                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11480                 was_trunc = 1;
11481         }
11482         chk->asoc = &stcb->asoc;
11483         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11484         if (chk->data == NULL) {
11485 jump_out:
11486                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11487                 return;
11488         }
11489         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11490         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11491         if (drp == NULL) {
11492                 sctp_m_freem(chk->data);
11493                 chk->data = NULL;
11494                 goto jump_out;
11495         }
11496         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11497             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11498         chk->book_size_scale = 0;
11499         if (was_trunc) {
11500                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11501                 drp->trunc_len = htons(fullsz);
11502                 /*
11503                  * Len is already adjusted to size minus overhead above take
11504                  * out the pkt_drop chunk itself from it.
11505                  */
11506                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11507                 len = chk->send_size;
11508         } else {
11509                 /* no truncation needed */
11510                 drp->ch.chunk_flags = 0;
11511                 drp->trunc_len = htons(0);
11512         }
11513         if (bad_crc) {
11514                 drp->ch.chunk_flags |= SCTP_BADCRC;
11515         }
11516         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11517         SCTP_BUF_LEN(chk->data) = chk->send_size;
11518         chk->sent = SCTP_DATAGRAM_UNSENT;
11519         chk->snd_count = 0;
11520         if (net) {
11521                 /* we should hit here */
11522                 chk->whoTo = net;
11523                 atomic_add_int(&chk->whoTo->ref_count, 1);
11524         } else {
11525                 chk->whoTo = NULL;
11526         }
11527         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11528         drp->ch.chunk_length = htons(chk->send_size);
11529         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11530         if (spc < 0) {
11531                 spc = 0;
11532         }
11533         drp->bottle_bw = htonl(spc);
11534         if (asoc->my_rwnd) {
11535                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11536                     asoc->size_on_all_streams +
11537                     asoc->my_rwnd_control_len +
11538                     stcb->sctp_socket->so_rcv.sb_cc);
11539         } else {
11540                 /*-
11541                  * If my rwnd is 0, possibly from mbuf depletion as well as
11542                  * space used, tell the peer there is NO space aka onq == bw
11543                  */
11544                 drp->current_onq = htonl(spc);
11545         }
11546         drp->reserved = 0;
11547         datap = drp->data;
11548         m_copydata(m, iphlen, len, (caddr_t)datap);
11549         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11550         asoc->ctrl_queue_cnt++;
11551 }
11552
11553 void
11554 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11555 {
11556         struct sctp_association *asoc;
11557         struct sctp_cwr_chunk *cwr;
11558         struct sctp_tmit_chunk *chk;
11559
11560         SCTP_TCB_LOCK_ASSERT(stcb);
11561         if (net == NULL) {
11562                 return;
11563         }
11564         asoc = &stcb->asoc;
11565         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11566                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11567                         /*
11568                          * found a previous CWR queued to same destination
11569                          * update it if needed
11570                          */
11571                         uint32_t ctsn;
11572
11573                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11574                         ctsn = ntohl(cwr->tsn);
11575                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11576                                 cwr->tsn = htonl(high_tsn);
11577                         }
11578                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11579                                 /* Make sure override is carried */
11580                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11581                         }
11582                         return;
11583                 }
11584         }
11585         sctp_alloc_a_chunk(stcb, chk);
11586         if (chk == NULL) {
11587                 return;
11588         }
11589         chk->copy_by_ref = 0;
11590         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11591         chk->rec.chunk_id.can_take_data = 1;
11592         chk->flags = 0;
11593         chk->asoc = &stcb->asoc;
11594         chk->send_size = sizeof(struct sctp_cwr_chunk);
11595         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11596         if (chk->data == NULL) {
11597                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11598                 return;
11599         }
11600         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11601         SCTP_BUF_LEN(chk->data) = chk->send_size;
11602         chk->sent = SCTP_DATAGRAM_UNSENT;
11603         chk->snd_count = 0;
11604         chk->whoTo = net;
11605         atomic_add_int(&chk->whoTo->ref_count, 1);
11606         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11607         cwr->ch.chunk_type = SCTP_ECN_CWR;
11608         cwr->ch.chunk_flags = override;
11609         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11610         cwr->tsn = htonl(high_tsn);
11611         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11612         asoc->ctrl_queue_cnt++;
11613 }
11614
11615 static int
11616 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11617     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11618 {
11619         uint16_t len, old_len, i;
11620         struct sctp_stream_reset_out_request *req_out;
11621         struct sctp_chunkhdr *ch;
11622         int at;
11623         int number_entries = 0;
11624
11625         ch = mtod(chk->data, struct sctp_chunkhdr *);
11626         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11627         /* get to new offset for the param. */
11628         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11629         /* now how long will this param be? */
11630         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11631                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11632                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11633                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11634                         number_entries++;
11635                 }
11636         }
11637         if (number_entries == 0) {
11638                 return (0);
11639         }
11640         if (number_entries == stcb->asoc.streamoutcnt) {
11641                 number_entries = 0;
11642         }
11643         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11644                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11645         }
11646         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11647         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11648         req_out->ph.param_length = htons(len);
11649         req_out->request_seq = htonl(seq);
11650         req_out->response_seq = htonl(resp_seq);
11651         req_out->send_reset_at_tsn = htonl(last_sent);
11652         at = 0;
11653         if (number_entries) {
11654                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11655                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11656                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11657                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11658                                 req_out->list_of_streams[at] = htons(i);
11659                                 at++;
11660                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11661                                 if (at >= number_entries) {
11662                                         break;
11663                                 }
11664                         }
11665                 }
11666         } else {
11667                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11668                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11669                 }
11670         }
11671         if (SCTP_SIZE32(len) > len) {
11672                 /*-
11673                  * Need to worry about the pad we may end up adding to the
11674                  * end. This is easy since the struct is either aligned to 4
11675                  * bytes or 2 bytes off.
11676                  */
11677                 req_out->list_of_streams[number_entries] = 0;
11678         }
11679         /* now fix the chunk length */
11680         ch->chunk_length = htons(len + old_len);
11681         chk->book_size = len + old_len;
11682         chk->book_size_scale = 0;
11683         chk->send_size = SCTP_SIZE32(chk->book_size);
11684         SCTP_BUF_LEN(chk->data) = chk->send_size;
11685         return (1);
11686 }
11687
11688 static void
11689 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11690     int number_entries, uint16_t *list,
11691     uint32_t seq)
11692 {
11693         uint16_t len, old_len, i;
11694         struct sctp_stream_reset_in_request *req_in;
11695         struct sctp_chunkhdr *ch;
11696
11697         ch = mtod(chk->data, struct sctp_chunkhdr *);
11698         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11699
11700         /* get to new offset for the param. */
11701         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11702         /* now how long will this param be? */
11703         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11704         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11705         req_in->ph.param_length = htons(len);
11706         req_in->request_seq = htonl(seq);
11707         if (number_entries) {
11708                 for (i = 0; i < number_entries; i++) {
11709                         req_in->list_of_streams[i] = htons(list[i]);
11710                 }
11711         }
11712         if (SCTP_SIZE32(len) > len) {
11713                 /*-
11714                  * Need to worry about the pad we may end up adding to the
11715                  * end. This is easy since the struct is either aligned to 4
11716                  * bytes or 2 bytes off.
11717                  */
11718                 req_in->list_of_streams[number_entries] = 0;
11719         }
11720         /* now fix the chunk length */
11721         ch->chunk_length = htons(len + old_len);
11722         chk->book_size = len + old_len;
11723         chk->book_size_scale = 0;
11724         chk->send_size = SCTP_SIZE32(chk->book_size);
11725         SCTP_BUF_LEN(chk->data) = chk->send_size;
11726         return;
11727 }
11728
11729 static void
11730 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11731     uint32_t seq)
11732 {
11733         uint16_t len, old_len;
11734         struct sctp_stream_reset_tsn_request *req_tsn;
11735         struct sctp_chunkhdr *ch;
11736
11737         ch = mtod(chk->data, struct sctp_chunkhdr *);
11738         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11739
11740         /* get to new offset for the param. */
11741         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11742         /* now how long will this param be? */
11743         len = sizeof(struct sctp_stream_reset_tsn_request);
11744         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11745         req_tsn->ph.param_length = htons(len);
11746         req_tsn->request_seq = htonl(seq);
11747
11748         /* now fix the chunk length */
11749         ch->chunk_length = htons(len + old_len);
11750         chk->send_size = len + old_len;
11751         chk->book_size = SCTP_SIZE32(chk->send_size);
11752         chk->book_size_scale = 0;
11753         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11754         return;
11755 }
11756
11757 void
11758 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11759     uint32_t resp_seq, uint32_t result)
11760 {
11761         uint16_t len, old_len;
11762         struct sctp_stream_reset_response *resp;
11763         struct sctp_chunkhdr *ch;
11764
11765         ch = mtod(chk->data, struct sctp_chunkhdr *);
11766         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11767
11768         /* get to new offset for the param. */
11769         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11770         /* now how long will this param be? */
11771         len = sizeof(struct sctp_stream_reset_response);
11772         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11773         resp->ph.param_length = htons(len);
11774         resp->response_seq = htonl(resp_seq);
11775         resp->result = ntohl(result);
11776
11777         /* now fix the chunk length */
11778         ch->chunk_length = htons(len + old_len);
11779         chk->book_size = len + old_len;
11780         chk->book_size_scale = 0;
11781         chk->send_size = SCTP_SIZE32(chk->book_size);
11782         SCTP_BUF_LEN(chk->data) = chk->send_size;
11783         return;
11784 }
11785
11786 void
11787 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11788     struct sctp_stream_reset_list *ent,
11789     int response)
11790 {
11791         struct sctp_association *asoc;
11792         struct sctp_tmit_chunk *chk;
11793         struct sctp_chunkhdr *ch;
11794
11795         asoc = &stcb->asoc;
11796
11797         /*
11798          * Reset our last reset action to the new one IP -> response
11799          * (PERFORMED probably). This assures that if we fail to send, a
11800          * retran from the peer will get the new response.
11801          */
11802         asoc->last_reset_action[0] = response;
11803         if (asoc->stream_reset_outstanding) {
11804                 return;
11805         }
11806         sctp_alloc_a_chunk(stcb, chk);
11807         if (chk == NULL) {
11808                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11809                 return;
11810         }
11811         chk->copy_by_ref = 0;
11812         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11813         chk->rec.chunk_id.can_take_data = 0;
11814         chk->flags = 0;
11815         chk->asoc = &stcb->asoc;
11816         chk->book_size = sizeof(struct sctp_chunkhdr);
11817         chk->send_size = SCTP_SIZE32(chk->book_size);
11818         chk->book_size_scale = 0;
11819         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11820         if (chk->data == NULL) {
11821                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11822                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11823                 return;
11824         }
11825         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11826         /* setup chunk parameters */
11827         chk->sent = SCTP_DATAGRAM_UNSENT;
11828         chk->snd_count = 0;
11829         if (stcb->asoc.alternate) {
11830                 chk->whoTo = stcb->asoc.alternate;
11831         } else {
11832                 chk->whoTo = stcb->asoc.primary_destination;
11833         }
11834         ch = mtod(chk->data, struct sctp_chunkhdr *);
11835         ch->chunk_type = SCTP_STREAM_RESET;
11836         ch->chunk_flags = 0;
11837         ch->chunk_length = htons(chk->book_size);
11838         atomic_add_int(&chk->whoTo->ref_count, 1);
11839         SCTP_BUF_LEN(chk->data) = chk->send_size;
11840         sctp_add_stream_reset_result(chk, ent->seq, response);
11841         /* insert the chunk for sending */
11842         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11843             chk,
11844             sctp_next);
11845         asoc->ctrl_queue_cnt++;
11846 }
11847
11848 void
11849 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11850     uint32_t resp_seq, uint32_t result,
11851     uint32_t send_una, uint32_t recv_next)
11852 {
11853         uint16_t len, old_len;
11854         struct sctp_stream_reset_response_tsn *resp;
11855         struct sctp_chunkhdr *ch;
11856
11857         ch = mtod(chk->data, struct sctp_chunkhdr *);
11858         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11859
11860         /* get to new offset for the param. */
11861         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11862         /* now how long will this param be? */
11863         len = sizeof(struct sctp_stream_reset_response_tsn);
11864         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11865         resp->ph.param_length = htons(len);
11866         resp->response_seq = htonl(resp_seq);
11867         resp->result = htonl(result);
11868         resp->senders_next_tsn = htonl(send_una);
11869         resp->receivers_next_tsn = htonl(recv_next);
11870
11871         /* now fix the chunk length */
11872         ch->chunk_length = htons(len + old_len);
11873         chk->book_size = len + old_len;
11874         chk->send_size = SCTP_SIZE32(chk->book_size);
11875         chk->book_size_scale = 0;
11876         SCTP_BUF_LEN(chk->data) = chk->send_size;
11877         return;
11878 }
11879
11880 static void
11881 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11882     uint32_t seq,
11883     uint16_t adding)
11884 {
11885         uint16_t len, old_len;
11886         struct sctp_chunkhdr *ch;
11887         struct sctp_stream_reset_add_strm *addstr;
11888
11889         ch = mtod(chk->data, struct sctp_chunkhdr *);
11890         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11891
11892         /* get to new offset for the param. */
11893         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11894         /* now how long will this param be? */
11895         len = sizeof(struct sctp_stream_reset_add_strm);
11896
11897         /* Fill it out. */
11898         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11899         addstr->ph.param_length = htons(len);
11900         addstr->request_seq = htonl(seq);
11901         addstr->number_of_streams = htons(adding);
11902         addstr->reserved = 0;
11903
11904         /* now fix the chunk length */
11905         ch->chunk_length = htons(len + old_len);
11906         chk->send_size = len + old_len;
11907         chk->book_size = SCTP_SIZE32(chk->send_size);
11908         chk->book_size_scale = 0;
11909         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11910         return;
11911 }
11912
11913 static void
11914 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11915     uint32_t seq,
11916     uint16_t adding)
11917 {
11918         uint16_t len, old_len;
11919         struct sctp_chunkhdr *ch;
11920         struct sctp_stream_reset_add_strm *addstr;
11921
11922         ch = mtod(chk->data, struct sctp_chunkhdr *);
11923         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11924
11925         /* get to new offset for the param. */
11926         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11927         /* now how long will this param be? */
11928         len = sizeof(struct sctp_stream_reset_add_strm);
11929         /* Fill it out. */
11930         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11931         addstr->ph.param_length = htons(len);
11932         addstr->request_seq = htonl(seq);
11933         addstr->number_of_streams = htons(adding);
11934         addstr->reserved = 0;
11935
11936         /* now fix the chunk length */
11937         ch->chunk_length = htons(len + old_len);
11938         chk->send_size = len + old_len;
11939         chk->book_size = SCTP_SIZE32(chk->send_size);
11940         chk->book_size_scale = 0;
11941         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11942         return;
11943 }
11944
11945 int
11946 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11947 {
11948         struct sctp_association *asoc;
11949         struct sctp_tmit_chunk *chk;
11950         struct sctp_chunkhdr *ch;
11951         uint32_t seq;
11952
11953         asoc = &stcb->asoc;
11954         asoc->trigger_reset = 0;
11955         if (asoc->stream_reset_outstanding) {
11956                 return (EALREADY);
11957         }
11958         sctp_alloc_a_chunk(stcb, chk);
11959         if (chk == NULL) {
11960                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11961                 return (ENOMEM);
11962         }
11963         chk->copy_by_ref = 0;
11964         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11965         chk->rec.chunk_id.can_take_data = 0;
11966         chk->flags = 0;
11967         chk->asoc = &stcb->asoc;
11968         chk->book_size = sizeof(struct sctp_chunkhdr);
11969         chk->send_size = SCTP_SIZE32(chk->book_size);
11970         chk->book_size_scale = 0;
11971         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11972         if (chk->data == NULL) {
11973                 sctp_free_a_chunk(stcb, chk, so_locked);
11974                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11975                 return (ENOMEM);
11976         }
11977         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11978
11979         /* setup chunk parameters */
11980         chk->sent = SCTP_DATAGRAM_UNSENT;
11981         chk->snd_count = 0;
11982         if (stcb->asoc.alternate) {
11983                 chk->whoTo = stcb->asoc.alternate;
11984         } else {
11985                 chk->whoTo = stcb->asoc.primary_destination;
11986         }
11987         ch = mtod(chk->data, struct sctp_chunkhdr *);
11988         ch->chunk_type = SCTP_STREAM_RESET;
11989         ch->chunk_flags = 0;
11990         ch->chunk_length = htons(chk->book_size);
11991         atomic_add_int(&chk->whoTo->ref_count, 1);
11992         SCTP_BUF_LEN(chk->data) = chk->send_size;
11993         seq = stcb->asoc.str_reset_seq_out;
11994         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11995                 seq++;
11996                 asoc->stream_reset_outstanding++;
11997         } else {
11998                 m_freem(chk->data);
11999                 chk->data = NULL;
12000                 sctp_free_a_chunk(stcb, chk, so_locked);
12001                 return (ENOENT);
12002         }
12003         asoc->str_reset = chk;
12004         /* insert the chunk for sending */
12005         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12006             chk,
12007             sctp_next);
12008         asoc->ctrl_queue_cnt++;
12009
12010         if (stcb->asoc.send_sack) {
12011                 sctp_send_sack(stcb, so_locked);
12012         }
12013         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12014         return (0);
12015 }
12016
12017 int
12018 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12019     uint16_t number_entries, uint16_t *list,
12020     uint8_t send_in_req,
12021     uint8_t send_tsn_req,
12022     uint8_t add_stream,
12023     uint16_t adding_o,
12024     uint16_t adding_i, uint8_t peer_asked)
12025 {
12026         struct sctp_association *asoc;
12027         struct sctp_tmit_chunk *chk;
12028         struct sctp_chunkhdr *ch;
12029         int can_send_out_req = 0;
12030         uint32_t seq;
12031
12032         asoc = &stcb->asoc;
12033         if (asoc->stream_reset_outstanding) {
12034                 /*-
12035                  * Already one pending, must get ACK back to clear the flag.
12036                  */
12037                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12038                 return (EBUSY);
12039         }
12040         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12041             (add_stream == 0)) {
12042                 /* nothing to do */
12043                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12044                 return (EINVAL);
12045         }
12046         if (send_tsn_req && send_in_req) {
12047                 /* error, can't do that */
12048                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12049                 return (EINVAL);
12050         } else if (send_in_req) {
12051                 can_send_out_req = 1;
12052         }
12053         if (number_entries > (MCLBYTES -
12054             SCTP_MIN_OVERHEAD -
12055             sizeof(struct sctp_chunkhdr) -
12056             sizeof(struct sctp_stream_reset_out_request)) /
12057             sizeof(uint16_t)) {
12058                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12059                 return (ENOMEM);
12060         }
12061         sctp_alloc_a_chunk(stcb, chk);
12062         if (chk == NULL) {
12063                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12064                 return (ENOMEM);
12065         }
12066         chk->copy_by_ref = 0;
12067         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12068         chk->rec.chunk_id.can_take_data = 0;
12069         chk->flags = 0;
12070         chk->asoc = &stcb->asoc;
12071         chk->book_size = sizeof(struct sctp_chunkhdr);
12072         chk->send_size = SCTP_SIZE32(chk->book_size);
12073         chk->book_size_scale = 0;
12074         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12075         if (chk->data == NULL) {
12076                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12077                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12078                 return (ENOMEM);
12079         }
12080         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12081
12082         /* setup chunk parameters */
12083         chk->sent = SCTP_DATAGRAM_UNSENT;
12084         chk->snd_count = 0;
12085         if (stcb->asoc.alternate) {
12086                 chk->whoTo = stcb->asoc.alternate;
12087         } else {
12088                 chk->whoTo = stcb->asoc.primary_destination;
12089         }
12090         atomic_add_int(&chk->whoTo->ref_count, 1);
12091         ch = mtod(chk->data, struct sctp_chunkhdr *);
12092         ch->chunk_type = SCTP_STREAM_RESET;
12093         ch->chunk_flags = 0;
12094         ch->chunk_length = htons(chk->book_size);
12095         SCTP_BUF_LEN(chk->data) = chk->send_size;
12096
12097         seq = stcb->asoc.str_reset_seq_out;
12098         if (can_send_out_req) {
12099                 int ret;
12100
12101                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12102                 if (ret) {
12103                         seq++;
12104                         asoc->stream_reset_outstanding++;
12105                 }
12106         }
12107         if ((add_stream & 1) &&
12108             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12109                 /* Need to allocate more */
12110                 struct sctp_stream_out *oldstream;
12111                 struct sctp_stream_queue_pending *sp, *nsp;
12112                 int i;
12113 #if defined(SCTP_DETAILED_STR_STATS)
12114                 int j;
12115 #endif
12116
12117                 oldstream = stcb->asoc.strmout;
12118                 /* get some more */
12119                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12120                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12121                     SCTP_M_STRMO);
12122                 if (stcb->asoc.strmout == NULL) {
12123                         uint8_t x;
12124
12125                         stcb->asoc.strmout = oldstream;
12126                         /* Turn off the bit */
12127                         x = add_stream & 0xfe;
12128                         add_stream = x;
12129                         goto skip_stuff;
12130                 }
12131                 /*
12132                  * Ok now we proceed with copying the old out stuff and
12133                  * initializing the new stuff.
12134                  */
12135                 SCTP_TCB_SEND_LOCK(stcb);
12136                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12137                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12138                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12139                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12140                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12141                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12142                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12143                         stcb->asoc.strmout[i].sid = i;
12144                         stcb->asoc.strmout[i].state = oldstream[i].state;
12145                         /* FIX ME FIX ME */
12146                         /*
12147                          * This should be a SS_COPY operation FIX ME STREAM
12148                          * SCHEDULER EXPERT
12149                          */
12150                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12151                         /* now anything on those queues? */
12152                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12153                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12154                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12155                         }
12156                 }
12157                 /* now the new streams */
12158                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12159                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12160                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12161                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12162 #if defined(SCTP_DETAILED_STR_STATS)
12163                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12164                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12165                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12166                         }
12167 #else
12168                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12169                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12170 #endif
12171                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12172                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12173                         stcb->asoc.strmout[i].sid = i;
12174                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12175                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12176                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12177                 }
12178                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12179                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12180                 SCTP_TCB_SEND_UNLOCK(stcb);
12181         }
12182 skip_stuff:
12183         if ((add_stream & 1) && (adding_o > 0)) {
12184                 asoc->strm_pending_add_size = adding_o;
12185                 asoc->peer_req_out = peer_asked;
12186                 sctp_add_an_out_stream(chk, seq, adding_o);
12187                 seq++;
12188                 asoc->stream_reset_outstanding++;
12189         }
12190         if ((add_stream & 2) && (adding_i > 0)) {
12191                 sctp_add_an_in_stream(chk, seq, adding_i);
12192                 seq++;
12193                 asoc->stream_reset_outstanding++;
12194         }
12195         if (send_in_req) {
12196                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12197                 seq++;
12198                 asoc->stream_reset_outstanding++;
12199         }
12200         if (send_tsn_req) {
12201                 sctp_add_stream_reset_tsn(chk, seq);
12202                 asoc->stream_reset_outstanding++;
12203         }
12204         asoc->str_reset = chk;
12205         /* insert the chunk for sending */
12206         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12207             chk,
12208             sctp_next);
12209         asoc->ctrl_queue_cnt++;
12210         if (stcb->asoc.send_sack) {
12211                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12212         }
12213         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12214         return (0);
12215 }
12216
12217 void
12218 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12219     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12220     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12221     uint32_t vrf_id, uint16_t port)
12222 {
12223         /* Don't respond to an ABORT with an ABORT. */
12224         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12225                 if (cause)
12226                         sctp_m_freem(cause);
12227                 return;
12228         }
12229         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12230             mflowtype, mflowid, fibnum,
12231             vrf_id, port);
12232         return;
12233 }
12234
12235 void
12236 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12237     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12238     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12239     uint32_t vrf_id, uint16_t port)
12240 {
12241         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12242             mflowtype, mflowid, fibnum,
12243             vrf_id, port);
12244         return;
12245 }
12246
12247 static struct mbuf *
12248 sctp_copy_resume(struct uio *uio,
12249     int max_send_len,
12250     int user_marks_eor,
12251     int *error,
12252     uint32_t *sndout,
12253     struct mbuf **new_tail)
12254 {
12255         struct mbuf *m;
12256
12257         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12258             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12259         if (m == NULL) {
12260                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12261                 *error = ENOBUFS;
12262         } else {
12263                 *sndout = m_length(m, NULL);
12264                 *new_tail = m_last(m);
12265         }
12266         return (m);
12267 }
12268
12269 static int
12270 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12271     struct uio *uio,
12272     int resv_upfront)
12273 {
12274         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12275             resv_upfront, 0);
12276         if (sp->data == NULL) {
12277                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12278                 return (ENOBUFS);
12279         }
12280
12281         sp->tail_mbuf = m_last(sp->data);
12282         return (0);
12283 }
12284
12285 static struct sctp_stream_queue_pending *
12286 sctp_copy_it_in(struct sctp_tcb *stcb,
12287     struct sctp_association *asoc,
12288     struct sctp_sndrcvinfo *srcv,
12289     struct uio *uio,
12290     struct sctp_nets *net,
12291     ssize_t max_send_len,
12292     int user_marks_eor,
12293     int *error)
12294 {
12295
12296         /*-
12297          * This routine must be very careful in its work. Protocol
12298          * processing is up and running so care must be taken to spl...()
12299          * when you need to do something that may effect the stcb/asoc. The
12300          * sb is locked however. When data is copied the protocol processing
12301          * should be enabled since this is a slower operation...
12302          */
12303         struct sctp_stream_queue_pending *sp = NULL;
12304         int resv_in_first;
12305
12306         *error = 0;
12307         /* Now can we send this? */
12308         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12309             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12310             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12311             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12312                 /* got data while shutting down */
12313                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12314                 *error = ECONNRESET;
12315                 goto out_now;
12316         }
12317         sctp_alloc_a_strmoq(stcb, sp);
12318         if (sp == NULL) {
12319                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12320                 *error = ENOMEM;
12321                 goto out_now;
12322         }
12323         sp->act_flags = 0;
12324         sp->sender_all_done = 0;
12325         sp->sinfo_flags = srcv->sinfo_flags;
12326         sp->timetolive = srcv->sinfo_timetolive;
12327         sp->ppid = srcv->sinfo_ppid;
12328         sp->context = srcv->sinfo_context;
12329         sp->fsn = 0;
12330         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12331
12332         sp->sid = srcv->sinfo_stream;
12333         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12334         if ((sp->length == (uint32_t)uio->uio_resid) &&
12335             ((user_marks_eor == 0) ||
12336             (srcv->sinfo_flags & SCTP_EOF) ||
12337             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12338                 sp->msg_is_complete = 1;
12339         } else {
12340                 sp->msg_is_complete = 0;
12341         }
12342         sp->sender_all_done = 0;
12343         sp->some_taken = 0;
12344         sp->put_last_out = 0;
12345         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12346         sp->data = sp->tail_mbuf = NULL;
12347         if (sp->length == 0) {
12348                 goto skip_copy;
12349         }
12350         if (srcv->sinfo_keynumber_valid) {
12351                 sp->auth_keyid = srcv->sinfo_keynumber;
12352         } else {
12353                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12354         }
12355         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12356                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12357                 sp->holds_key_ref = 1;
12358         }
12359         *error = sctp_copy_one(sp, uio, resv_in_first);
12360 skip_copy:
12361         if (*error) {
12362                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12363                 sp = NULL;
12364         } else {
12365                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12366                         sp->net = net;
12367                         atomic_add_int(&sp->net->ref_count, 1);
12368                 } else {
12369                         sp->net = NULL;
12370                 }
12371                 sctp_set_prsctp_policy(sp);
12372         }
12373 out_now:
12374         return (sp);
12375 }
12376
12377 int
12378 sctp_sosend(struct socket *so,
12379     struct sockaddr *addr,
12380     struct uio *uio,
12381     struct mbuf *top,
12382     struct mbuf *control,
12383     int flags,
12384     struct thread *p
12385 )
12386 {
12387         int error, use_sndinfo = 0;
12388         struct sctp_sndrcvinfo sndrcvninfo;
12389         struct sockaddr *addr_to_use;
12390 #if defined(INET) && defined(INET6)
12391         struct sockaddr_in sin;
12392 #endif
12393
12394         if (control) {
12395                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12396                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12397                     sizeof(sndrcvninfo))) {
12398                         /* got one */
12399                         use_sndinfo = 1;
12400                 }
12401         }
12402         addr_to_use = addr;
12403 #if defined(INET) && defined(INET6)
12404         if ((addr) && (addr->sa_family == AF_INET6)) {
12405                 struct sockaddr_in6 *sin6;
12406
12407                 sin6 = (struct sockaddr_in6 *)addr;
12408                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12409                         in6_sin6_2_sin(&sin, sin6);
12410                         addr_to_use = (struct sockaddr *)&sin;
12411                 }
12412         }
12413 #endif
12414         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12415             control,
12416             flags,
12417             use_sndinfo ? &sndrcvninfo : NULL
12418             ,p
12419             );
12420         return (error);
12421 }
12422
12423 int
12424 sctp_lower_sosend(struct socket *so,
12425     struct sockaddr *addr,
12426     struct uio *uio,
12427     struct mbuf *i_pak,
12428     struct mbuf *control,
12429     int flags,
12430     struct sctp_sndrcvinfo *srcv
12431     ,
12432     struct thread *p
12433 )
12434 {
12435         struct epoch_tracker et;
12436         ssize_t sndlen = 0, max_len, local_add_more;
12437         int error, len;
12438         struct mbuf *top = NULL;
12439         int queue_only = 0, queue_only_for_init = 0;
12440         int free_cnt_applied = 0;
12441         int un_sent;
12442         int now_filled = 0;
12443         unsigned int inqueue_bytes = 0;
12444         struct sctp_block_entry be;
12445         struct sctp_inpcb *inp;
12446         struct sctp_tcb *stcb = NULL;
12447         struct timeval now;
12448         struct sctp_nets *net;
12449         struct sctp_association *asoc;
12450         struct sctp_inpcb *t_inp;
12451         int user_marks_eor;
12452         int create_lock_applied = 0;
12453         int nagle_applies = 0;
12454         int some_on_control = 0;
12455         int got_all_of_the_send = 0;
12456         int hold_tcblock = 0;
12457         int non_blocking = 0;
12458         ssize_t local_soresv = 0;
12459         uint16_t port;
12460         uint16_t sinfo_flags;
12461         sctp_assoc_t sinfo_assoc_id;
12462
12463         error = 0;
12464         net = NULL;
12465         stcb = NULL;
12466         asoc = NULL;
12467
12468         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12469         if (inp == NULL) {
12470                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12471                 error = EINVAL;
12472                 if (i_pak) {
12473                         SCTP_RELEASE_PKT(i_pak);
12474                 }
12475                 return (error);
12476         }
12477         if ((uio == NULL) && (i_pak == NULL)) {
12478                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12479                 return (EINVAL);
12480         }
12481         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12482         atomic_add_int(&inp->total_sends, 1);
12483         if (uio) {
12484                 if (uio->uio_resid < 0) {
12485                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12486                         return (EINVAL);
12487                 }
12488                 sndlen = uio->uio_resid;
12489         } else {
12490                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12491                 sndlen = SCTP_HEADER_LEN(i_pak);
12492         }
12493         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12494             (void *)addr,
12495             sndlen);
12496         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12497             SCTP_IS_LISTENING(inp)) {
12498                 /* The listener can NOT send */
12499                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12500                 error = ENOTCONN;
12501                 goto out_unlocked;
12502         }
12503         /**
12504          * Pre-screen address, if one is given the sin-len
12505          * must be set correctly!
12506          */
12507         if (addr) {
12508                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12509
12510                 switch (raddr->sa.sa_family) {
12511 #ifdef INET
12512                 case AF_INET:
12513                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12514                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12515                                 error = EINVAL;
12516                                 goto out_unlocked;
12517                         }
12518                         port = raddr->sin.sin_port;
12519                         break;
12520 #endif
12521 #ifdef INET6
12522                 case AF_INET6:
12523                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12524                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12525                                 error = EINVAL;
12526                                 goto out_unlocked;
12527                         }
12528                         port = raddr->sin6.sin6_port;
12529                         break;
12530 #endif
12531                 default:
12532                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12533                         error = EAFNOSUPPORT;
12534                         goto out_unlocked;
12535                 }
12536         } else
12537                 port = 0;
12538
12539         if (srcv) {
12540                 sinfo_flags = srcv->sinfo_flags;
12541                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12542                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12543                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12544                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12545                         error = EINVAL;
12546                         goto out_unlocked;
12547                 }
12548                 if (srcv->sinfo_flags)
12549                         SCTP_STAT_INCR(sctps_sends_with_flags);
12550         } else {
12551                 sinfo_flags = inp->def_send.sinfo_flags;
12552                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12553         }
12554         if (flags & MSG_EOR) {
12555                 sinfo_flags |= SCTP_EOR;
12556         }
12557         if (flags & MSG_EOF) {
12558                 sinfo_flags |= SCTP_EOF;
12559         }
12560         if (sinfo_flags & SCTP_SENDALL) {
12561                 /* its a sendall */
12562                 error = sctp_sendall(inp, uio, top, srcv);
12563                 top = NULL;
12564                 goto out_unlocked;
12565         }
12566         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12567                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12568                 error = EINVAL;
12569                 goto out_unlocked;
12570         }
12571         /* now we must find the assoc */
12572         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12573             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12574                 SCTP_INP_RLOCK(inp);
12575                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12576                 if (stcb) {
12577                         SCTP_TCB_LOCK(stcb);
12578                         hold_tcblock = 1;
12579                 }
12580                 SCTP_INP_RUNLOCK(inp);
12581         } else if (sinfo_assoc_id) {
12582                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12583                 if (stcb != NULL) {
12584                         hold_tcblock = 1;
12585                 }
12586         } else if (addr) {
12587                 /*-
12588                  * Since we did not use findep we must
12589                  * increment it, and if we don't find a tcb
12590                  * decrement it.
12591                  */
12592                 SCTP_INP_WLOCK(inp);
12593                 SCTP_INP_INCR_REF(inp);
12594                 SCTP_INP_WUNLOCK(inp);
12595                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12596                 if (stcb == NULL) {
12597                         SCTP_INP_WLOCK(inp);
12598                         SCTP_INP_DECR_REF(inp);
12599                         SCTP_INP_WUNLOCK(inp);
12600                 } else {
12601                         hold_tcblock = 1;
12602                 }
12603         }
12604         if ((stcb == NULL) && (addr)) {
12605                 /* Possible implicit send? */
12606                 SCTP_ASOC_CREATE_LOCK(inp);
12607                 create_lock_applied = 1;
12608                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12609                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12610                         /* Should I really unlock ? */
12611                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12612                         error = EINVAL;
12613                         goto out_unlocked;
12614                 }
12615                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12616                     (addr->sa_family == AF_INET6)) {
12617                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12618                         error = EINVAL;
12619                         goto out_unlocked;
12620                 }
12621                 SCTP_INP_WLOCK(inp);
12622                 SCTP_INP_INCR_REF(inp);
12623                 SCTP_INP_WUNLOCK(inp);
12624                 /* With the lock applied look again */
12625                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12626 #if defined(INET) || defined(INET6)
12627                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12628                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12629                 }
12630 #endif
12631                 if (stcb == NULL) {
12632                         SCTP_INP_WLOCK(inp);
12633                         SCTP_INP_DECR_REF(inp);
12634                         SCTP_INP_WUNLOCK(inp);
12635                 } else {
12636                         hold_tcblock = 1;
12637                 }
12638                 if (error) {
12639                         goto out_unlocked;
12640                 }
12641                 if (t_inp != inp) {
12642                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12643                         error = ENOTCONN;
12644                         goto out_unlocked;
12645                 }
12646         }
12647         if (stcb == NULL) {
12648                 if (addr == NULL) {
12649                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12650                         error = ENOENT;
12651                         goto out_unlocked;
12652                 } else {
12653                         /* We must go ahead and start the INIT process */
12654                         uint32_t vrf_id;
12655
12656                         if ((sinfo_flags & SCTP_ABORT) ||
12657                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12658                                 /*-
12659                                  * User asks to abort a non-existant assoc,
12660                                  * or EOF a non-existant assoc with no data
12661                                  */
12662                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12663                                 error = ENOENT;
12664                                 goto out_unlocked;
12665                         }
12666                         /* get an asoc/stcb struct */
12667                         vrf_id = inp->def_vrf_id;
12668 #ifdef INVARIANTS
12669                         if (create_lock_applied == 0) {
12670                                 panic("Error, should hold create lock and I don't?");
12671                         }
12672 #endif
12673                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12674                             inp->sctp_ep.pre_open_stream_count,
12675                             inp->sctp_ep.port,
12676                             p,
12677                             SCTP_INITIALIZE_AUTH_PARAMS);
12678                         if (stcb == NULL) {
12679                                 /* Error is setup for us in the call */
12680                                 goto out_unlocked;
12681                         }
12682                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12683                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12684                                 /*
12685                                  * Set the connected flag so we can queue
12686                                  * data
12687                                  */
12688                                 soisconnecting(so);
12689                         }
12690                         hold_tcblock = 1;
12691                         if (create_lock_applied) {
12692                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12693                                 create_lock_applied = 0;
12694                         } else {
12695                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12696                         }
12697                         /*
12698                          * Turn on queue only flag to prevent data from
12699                          * being sent
12700                          */
12701                         queue_only = 1;
12702                         asoc = &stcb->asoc;
12703                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12704                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12705
12706                         if (control) {
12707                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12708                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12709                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12710                                         hold_tcblock = 0;
12711                                         stcb = NULL;
12712                                         goto out_unlocked;
12713                                 }
12714                         }
12715                         /* out with the INIT */
12716                         queue_only_for_init = 1;
12717                         /*-
12718                          * we may want to dig in after this call and adjust the MTU
12719                          * value. It defaulted to 1500 (constant) but the ro
12720                          * structure may now have an update and thus we may need to
12721                          * change it BEFORE we append the message.
12722                          */
12723                 }
12724         } else
12725                 asoc = &stcb->asoc;
12726         if (srcv == NULL) {
12727                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12728                 sinfo_flags = srcv->sinfo_flags;
12729                 if (flags & MSG_EOR) {
12730                         sinfo_flags |= SCTP_EOR;
12731                 }
12732                 if (flags & MSG_EOF) {
12733                         sinfo_flags |= SCTP_EOF;
12734                 }
12735         }
12736         if (sinfo_flags & SCTP_ADDR_OVER) {
12737                 if (addr)
12738                         net = sctp_findnet(stcb, addr);
12739                 else
12740                         net = NULL;
12741                 if ((net == NULL) ||
12742                     ((port != 0) && (port != stcb->rport))) {
12743                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12744                         error = EINVAL;
12745                         goto out_unlocked;
12746                 }
12747         } else {
12748                 if (stcb->asoc.alternate) {
12749                         net = stcb->asoc.alternate;
12750                 } else {
12751                         net = stcb->asoc.primary_destination;
12752                 }
12753         }
12754         atomic_add_int(&stcb->total_sends, 1);
12755         /* Keep the stcb from being freed under our feet */
12756         atomic_add_int(&asoc->refcnt, 1);
12757         free_cnt_applied = 1;
12758
12759         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12760                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12761                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12762                         error = EMSGSIZE;
12763                         goto out_unlocked;
12764                 }
12765         }
12766         if (SCTP_SO_IS_NBIO(so)
12767             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12768             ) {
12769                 non_blocking = 1;
12770         }
12771         /* would we block? */
12772         if (non_blocking) {
12773                 ssize_t amount;
12774
12775                 if (hold_tcblock == 0) {
12776                         SCTP_TCB_LOCK(stcb);
12777                         hold_tcblock = 1;
12778                 }
12779                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12780                 if (user_marks_eor == 0) {
12781                         amount = sndlen;
12782                 } else {
12783                         amount = 1;
12784                 }
12785                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12786                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12787                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12788                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12789                                 error = EMSGSIZE;
12790                         else
12791                                 error = EWOULDBLOCK;
12792                         goto out_unlocked;
12793                 }
12794                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12795                 SCTP_TCB_UNLOCK(stcb);
12796                 hold_tcblock = 0;
12797         } else {
12798                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12799         }
12800         local_soresv = sndlen;
12801         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12802                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12803                 error = ECONNRESET;
12804                 goto out_unlocked;
12805         }
12806         if (create_lock_applied) {
12807                 SCTP_ASOC_CREATE_UNLOCK(inp);
12808                 create_lock_applied = 0;
12809         }
12810         /* Is the stream no. valid? */
12811         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12812                 /* Invalid stream number */
12813                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12814                 error = EINVAL;
12815                 goto out_unlocked;
12816         }
12817         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12818             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12819                 /*
12820                  * Can't queue any data while stream reset is underway.
12821                  */
12822                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12823                         error = EAGAIN;
12824                 } else {
12825                         error = EINVAL;
12826                 }
12827                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12828                 goto out_unlocked;
12829         }
12830         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12831             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12832                 queue_only = 1;
12833         }
12834         /* we are now done with all control */
12835         if (control) {
12836                 sctp_m_freem(control);
12837                 control = NULL;
12838         }
12839         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12840             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12841             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12842             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12843                 if (sinfo_flags & SCTP_ABORT) {
12844                         ;
12845                 } else {
12846                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12847                         error = ECONNRESET;
12848                         goto out_unlocked;
12849                 }
12850         }
12851         /* Ok, we will attempt a msgsnd :> */
12852         if (p) {
12853                 p->td_ru.ru_msgsnd++;
12854         }
12855         /* Are we aborting? */
12856         if (sinfo_flags & SCTP_ABORT) {
12857                 struct mbuf *mm;
12858                 ssize_t tot_demand, tot_out = 0, max_out;
12859
12860                 SCTP_STAT_INCR(sctps_sends_with_abort);
12861                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12862                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12863                         /* It has to be up before we abort */
12864                         /* how big is the user initiated abort? */
12865                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12866                         error = EINVAL;
12867                         goto out;
12868                 }
12869                 if (hold_tcblock) {
12870                         SCTP_TCB_UNLOCK(stcb);
12871                         hold_tcblock = 0;
12872                 }
12873                 if (top) {
12874                         struct mbuf *cntm = NULL;
12875
12876                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12877                         if (sndlen != 0) {
12878                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12879                                         tot_out += SCTP_BUF_LEN(cntm);
12880                                 }
12881                         }
12882                 } else {
12883                         /* Must fit in a MTU */
12884                         tot_out = sndlen;
12885                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12886                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12887                                 /* To big */
12888                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12889                                 error = EMSGSIZE;
12890                                 goto out;
12891                         }
12892                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12893                 }
12894                 if (mm == NULL) {
12895                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12896                         error = ENOMEM;
12897                         goto out;
12898                 }
12899                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12900                 max_out -= sizeof(struct sctp_abort_msg);
12901                 if (tot_out > max_out) {
12902                         tot_out = max_out;
12903                 }
12904                 if (mm) {
12905                         struct sctp_paramhdr *ph;
12906
12907                         /* now move forward the data pointer */
12908                         ph = mtod(mm, struct sctp_paramhdr *);
12909                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12910                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12911                         ph++;
12912                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12913                         if (top == NULL) {
12914                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12915                                 if (error) {
12916                                         /*-
12917                                          * Here if we can't get his data we
12918                                          * still abort we just don't get to
12919                                          * send the users note :-0
12920                                          */
12921                                         sctp_m_freem(mm);
12922                                         mm = NULL;
12923                                 }
12924                         } else {
12925                                 if (sndlen != 0) {
12926                                         SCTP_BUF_NEXT(mm) = top;
12927                                 }
12928                         }
12929                 }
12930                 if (hold_tcblock == 0) {
12931                         SCTP_TCB_LOCK(stcb);
12932                 }
12933                 atomic_add_int(&stcb->asoc.refcnt, -1);
12934                 free_cnt_applied = 0;
12935                 /* release this lock, otherwise we hang on ourselves */
12936                 NET_EPOCH_ENTER(et);
12937                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12938                 NET_EPOCH_EXIT(et);
12939                 /* now relock the stcb so everything is sane */
12940                 hold_tcblock = 0;
12941                 stcb = NULL;
12942                 /*
12943                  * In this case top is already chained to mm avoid double
12944                  * free, since we free it below if top != NULL and driver
12945                  * would free it after sending the packet out
12946                  */
12947                 if (sndlen != 0) {
12948                         top = NULL;
12949                 }
12950                 goto out_unlocked;
12951         }
12952         /* Calculate the maximum we can send */
12953         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12954         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12955                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12956         } else {
12957                 max_len = 0;
12958         }
12959         if (hold_tcblock) {
12960                 SCTP_TCB_UNLOCK(stcb);
12961                 hold_tcblock = 0;
12962         }
12963         if (asoc->strmout == NULL) {
12964                 /* huh? software error */
12965                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12966                 error = EFAULT;
12967                 goto out_unlocked;
12968         }
12969
12970         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12971         if ((user_marks_eor == 0) &&
12972             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12973                 /* It will NEVER fit */
12974                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12975                 error = EMSGSIZE;
12976                 goto out_unlocked;
12977         }
12978         if ((uio == NULL) && user_marks_eor) {
12979                 /*-
12980                  * We do not support eeor mode for
12981                  * sending with mbuf chains (like sendfile).
12982                  */
12983                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12984                 error = EINVAL;
12985                 goto out_unlocked;
12986         }
12987
12988         if (user_marks_eor) {
12989                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12990         } else {
12991                 /*-
12992                  * For non-eeor the whole message must fit in
12993                  * the socket send buffer.
12994                  */
12995                 local_add_more = sndlen;
12996         }
12997         len = 0;
12998         if (non_blocking) {
12999                 goto skip_preblock;
13000         }
13001         if (((max_len <= local_add_more) &&
13002             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13003             (max_len == 0) ||
13004             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13005                 /* No room right now ! */
13006                 SOCKBUF_LOCK(&so->so_snd);
13007                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13008                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13009                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13010                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13011                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13012                             inqueue_bytes,
13013                             local_add_more,
13014                             stcb->asoc.stream_queue_cnt,
13015                             stcb->asoc.chunks_on_out_queue,
13016                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13017                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13018                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13019                         }
13020                         be.error = 0;
13021                         stcb->block_entry = &be;
13022                         error = sbwait(&so->so_snd);
13023                         stcb->block_entry = NULL;
13024                         if (error || so->so_error || be.error) {
13025                                 if (error == 0) {
13026                                         if (so->so_error)
13027                                                 error = so->so_error;
13028                                         if (be.error) {
13029                                                 error = be.error;
13030                                         }
13031                                 }
13032                                 SOCKBUF_UNLOCK(&so->so_snd);
13033                                 goto out_unlocked;
13034                         }
13035                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13036                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13037                                     asoc, stcb->asoc.total_output_queue_size);
13038                         }
13039                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13040                                 SOCKBUF_UNLOCK(&so->so_snd);
13041                                 goto out_unlocked;
13042                         }
13043                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13044                 }
13045                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13046                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13047                 } else {
13048                         max_len = 0;
13049                 }
13050                 SOCKBUF_UNLOCK(&so->so_snd);
13051         }
13052
13053 skip_preblock:
13054         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13055                 goto out_unlocked;
13056         }
13057         /*
13058          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13059          * case NOTE: uio will be null when top/mbuf is passed
13060          */
13061         if (sndlen == 0) {
13062                 if (sinfo_flags & SCTP_EOF) {
13063                         got_all_of_the_send = 1;
13064                         goto dataless_eof;
13065                 } else {
13066                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13067                         error = EINVAL;
13068                         goto out;
13069                 }
13070         }
13071         if (top == NULL) {
13072                 struct sctp_stream_queue_pending *sp;
13073                 struct sctp_stream_out *strm;
13074                 uint32_t sndout;
13075
13076                 SCTP_TCB_SEND_LOCK(stcb);
13077                 if ((asoc->stream_locked) &&
13078                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13079                         SCTP_TCB_SEND_UNLOCK(stcb);
13080                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13081                         error = EINVAL;
13082                         goto out;
13083                 }
13084                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13085                 if (strm->last_msg_incomplete == 0) {
13086         do_a_copy_in:
13087                         SCTP_TCB_SEND_UNLOCK(stcb);
13088                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13089                         if (error) {
13090                                 goto out;
13091                         }
13092                         SCTP_TCB_SEND_LOCK(stcb);
13093                         if (sp->msg_is_complete) {
13094                                 strm->last_msg_incomplete = 0;
13095                                 asoc->stream_locked = 0;
13096                         } else {
13097                                 /*
13098                                  * Just got locked to this guy in case of an
13099                                  * interrupt.
13100                                  */
13101                                 strm->last_msg_incomplete = 1;
13102                                 if (stcb->asoc.idata_supported == 0) {
13103                                         asoc->stream_locked = 1;
13104                                         asoc->stream_locked_on = srcv->sinfo_stream;
13105                                 }
13106                                 sp->sender_all_done = 0;
13107                         }
13108                         sctp_snd_sb_alloc(stcb, sp->length);
13109                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13110                         if (sinfo_flags & SCTP_UNORDERED) {
13111                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13112                         }
13113                         sp->processing = 1;
13114                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13115                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13116                 } else {
13117                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13118                         if (sp == NULL) {
13119                                 /* ???? Huh ??? last msg is gone */
13120 #ifdef INVARIANTS
13121                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13122 #else
13123                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13124                                 strm->last_msg_incomplete = 0;
13125 #endif
13126                                 goto do_a_copy_in;
13127                         }
13128                         if (sp->processing) {
13129                                 SCTP_TCB_SEND_UNLOCK(stcb);
13130                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13131                                 error = EINVAL;
13132                                 goto out;
13133                         } else {
13134                                 sp->processing = 1;
13135                         }
13136                 }
13137                 SCTP_TCB_SEND_UNLOCK(stcb);
13138                 while (uio->uio_resid > 0) {
13139                         /* How much room do we have? */
13140                         struct mbuf *new_tail, *mm;
13141
13142                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13143                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13144                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13145                         else
13146                                 max_len = 0;
13147
13148                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13149                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13150                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13151                                 sndout = 0;
13152                                 new_tail = NULL;
13153                                 if (hold_tcblock) {
13154                                         SCTP_TCB_UNLOCK(stcb);
13155                                         hold_tcblock = 0;
13156                                 }
13157                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13158                                 if ((mm == NULL) || error) {
13159                                         if (mm) {
13160                                                 sctp_m_freem(mm);
13161                                         }
13162                                         SCTP_TCB_SEND_LOCK(stcb);
13163                                         if (sp != NULL) {
13164                                                 sp->processing = 0;
13165                                         }
13166                                         SCTP_TCB_SEND_UNLOCK(stcb);
13167                                         goto out;
13168                                 }
13169                                 /* Update the mbuf and count */
13170                                 SCTP_TCB_SEND_LOCK(stcb);
13171                                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13172                                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13173                                         /*
13174                                          * we need to get out. Peer probably
13175                                          * aborted.
13176                                          */
13177                                         sctp_m_freem(mm);
13178                                         if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) {
13179                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13180                                                 error = ECONNRESET;
13181                                         }
13182                                         if (sp != NULL) {
13183                                                 sp->processing = 0;
13184                                         }
13185                                         SCTP_TCB_SEND_UNLOCK(stcb);
13186                                         goto out;
13187                                 }
13188                                 if (sp->tail_mbuf) {
13189                                         /* tack it to the end */
13190                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13191                                         sp->tail_mbuf = new_tail;
13192                                 } else {
13193                                         /* A stolen mbuf */
13194                                         sp->data = mm;
13195                                         sp->tail_mbuf = new_tail;
13196                                 }
13197                                 sctp_snd_sb_alloc(stcb, sndout);
13198                                 atomic_add_int(&sp->length, sndout);
13199                                 len += sndout;
13200                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13201                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13202                                 }
13203
13204                                 /* Did we reach EOR? */
13205                                 if ((uio->uio_resid == 0) &&
13206                                     ((user_marks_eor == 0) ||
13207                                     (sinfo_flags & SCTP_EOF) ||
13208                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13209                                         sp->msg_is_complete = 1;
13210                                 } else {
13211                                         sp->msg_is_complete = 0;
13212                                 }
13213                                 SCTP_TCB_SEND_UNLOCK(stcb);
13214                         }
13215                         if (uio->uio_resid == 0) {
13216                                 /* got it all? */
13217                                 continue;
13218                         }
13219                         /* PR-SCTP? */
13220                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13221                                 /*
13222                                  * This is ugly but we must assure locking
13223                                  * order
13224                                  */
13225                                 if (hold_tcblock == 0) {
13226                                         SCTP_TCB_LOCK(stcb);
13227                                         hold_tcblock = 1;
13228                                 }
13229                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13230                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13231                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13232                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13233                                 else
13234                                         max_len = 0;
13235                                 if (max_len > 0) {
13236                                         continue;
13237                                 }
13238                                 SCTP_TCB_UNLOCK(stcb);
13239                                 hold_tcblock = 0;
13240                         }
13241                         /* wait for space now */
13242                         if (non_blocking) {
13243                                 /* Non-blocking io in place out */
13244                                 SCTP_TCB_SEND_LOCK(stcb);
13245                                 if (sp != NULL) {
13246                                         sp->processing = 0;
13247                                 }
13248                                 SCTP_TCB_SEND_UNLOCK(stcb);
13249                                 goto skip_out_eof;
13250                         }
13251                         /* What about the INIT, send it maybe */
13252                         if (queue_only_for_init) {
13253                                 if (hold_tcblock == 0) {
13254                                         SCTP_TCB_LOCK(stcb);
13255                                         hold_tcblock = 1;
13256                                 }
13257                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13258                                         /* a collision took us forward? */
13259                                         queue_only = 0;
13260                                 } else {
13261                                         NET_EPOCH_ENTER(et);
13262                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13263                                         NET_EPOCH_EXIT(et);
13264                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13265                                         queue_only = 1;
13266                                 }
13267                         }
13268                         if ((net->flight_size > net->cwnd) &&
13269                             (asoc->sctp_cmt_on_off == 0)) {
13270                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13271                                 queue_only = 1;
13272                         } else if (asoc->ifp_had_enobuf) {
13273                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13274                                 if (net->flight_size > (2 * net->mtu)) {
13275                                         queue_only = 1;
13276                                 }
13277                                 asoc->ifp_had_enobuf = 0;
13278                         }
13279                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13280                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13281                             (stcb->asoc.total_flight > 0) &&
13282                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13283                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13284                                 /*-
13285                                  * Ok, Nagle is set on and we have data outstanding.
13286                                  * Don't send anything and let SACKs drive out the
13287                                  * data unless we have a "full" segment to send.
13288                                  */
13289                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13290                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13291                                 }
13292                                 SCTP_STAT_INCR(sctps_naglequeued);
13293                                 nagle_applies = 1;
13294                         } else {
13295                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13296                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13297                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13298                                 }
13299                                 SCTP_STAT_INCR(sctps_naglesent);
13300                                 nagle_applies = 0;
13301                         }
13302                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13303                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13304                                     nagle_applies, un_sent);
13305                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13306                                     stcb->asoc.total_flight,
13307                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13308                         }
13309                         if (queue_only_for_init)
13310                                 queue_only_for_init = 0;
13311                         if ((queue_only == 0) && (nagle_applies == 0)) {
13312                                 /*-
13313                                  * need to start chunk output
13314                                  * before blocking.. note that if
13315                                  * a lock is already applied, then
13316                                  * the input via the net is happening
13317                                  * and I don't need to start output :-D
13318                                  */
13319                                 NET_EPOCH_ENTER(et);
13320                                 if (hold_tcblock == 0) {
13321                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13322                                                 hold_tcblock = 1;
13323                                                 sctp_chunk_output(inp,
13324                                                     stcb,
13325                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13326                                         }
13327                                 } else {
13328                                         sctp_chunk_output(inp,
13329                                             stcb,
13330                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13331                                 }
13332                                 NET_EPOCH_EXIT(et);
13333                         }
13334                         if (hold_tcblock == 1) {
13335                                 SCTP_TCB_UNLOCK(stcb);
13336                                 hold_tcblock = 0;
13337                         }
13338                         SOCKBUF_LOCK(&so->so_snd);
13339                         /*-
13340                          * This is a bit strange, but I think it will
13341                          * work. The total_output_queue_size is locked and
13342                          * protected by the TCB_LOCK, which we just released.
13343                          * There is a race that can occur between releasing it
13344                          * above, and me getting the socket lock, where sacks
13345                          * come in but we have not put the SB_WAIT on the
13346                          * so_snd buffer to get the wakeup. After the LOCK
13347                          * is applied the sack_processing will also need to
13348                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13349                          * once we have the socket buffer lock if we recheck the
13350                          * size we KNOW we will get to sleep safely with the
13351                          * wakeup flag in place.
13352                          */
13353                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13354                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13355                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13356                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13357                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13358                                             asoc, uio->uio_resid);
13359                                 }
13360                                 be.error = 0;
13361                                 stcb->block_entry = &be;
13362                                 error = sbwait(&so->so_snd);
13363                                 stcb->block_entry = NULL;
13364
13365                                 if (error || so->so_error || be.error) {
13366                                         if (error == 0) {
13367                                                 if (so->so_error)
13368                                                         error = so->so_error;
13369                                                 if (be.error) {
13370                                                         error = be.error;
13371                                                 }
13372                                         }
13373                                         SOCKBUF_UNLOCK(&so->so_snd);
13374                                         SCTP_TCB_SEND_LOCK(stcb);
13375                                         if (sp != NULL) {
13376                                                 sp->processing = 0;
13377                                         }
13378                                         SCTP_TCB_SEND_UNLOCK(stcb);
13379                                         goto out_unlocked;
13380                                 }
13381
13382                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13383                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13384                                             asoc, stcb->asoc.total_output_queue_size);
13385                                 }
13386                         }
13387                         SOCKBUF_UNLOCK(&so->so_snd);
13388                         SCTP_TCB_SEND_LOCK(stcb);
13389                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13390                                 if (sp != NULL) {
13391                                         sp->processing = 0;
13392                                 }
13393                                 SCTP_TCB_SEND_UNLOCK(stcb);
13394                                 goto out_unlocked;
13395                         }
13396                         SCTP_TCB_SEND_UNLOCK(stcb);
13397                 }
13398                 SCTP_TCB_SEND_LOCK(stcb);
13399                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13400                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13401                         SCTP_TCB_SEND_UNLOCK(stcb);
13402                         goto out_unlocked;
13403                 }
13404                 if (sp) {
13405                         if (sp->msg_is_complete == 0) {
13406                                 strm->last_msg_incomplete = 1;
13407                                 if (stcb->asoc.idata_supported == 0) {
13408                                         asoc->stream_locked = 1;
13409                                         asoc->stream_locked_on = srcv->sinfo_stream;
13410                                 }
13411                         } else {
13412                                 sp->sender_all_done = 1;
13413                                 strm->last_msg_incomplete = 0;
13414                                 asoc->stream_locked = 0;
13415                         }
13416                         sp->processing = 0;
13417                 } else {
13418                         SCTP_PRINTF("Huh no sp TSNH?\n");
13419                         strm->last_msg_incomplete = 0;
13420                         asoc->stream_locked = 0;
13421                 }
13422                 SCTP_TCB_SEND_UNLOCK(stcb);
13423                 if (uio->uio_resid == 0) {
13424                         got_all_of_the_send = 1;
13425                 }
13426         } else {
13427                 /* We send in a 0, since we do NOT have any locks */
13428                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13429                 top = NULL;
13430                 if (sinfo_flags & SCTP_EOF) {
13431                         got_all_of_the_send = 1;
13432                 }
13433         }
13434         if (error) {
13435                 goto out;
13436         }
13437 dataless_eof:
13438         /* EOF thing ? */
13439         if ((sinfo_flags & SCTP_EOF) &&
13440             (got_all_of_the_send == 1)) {
13441                 SCTP_STAT_INCR(sctps_sends_with_eof);
13442                 error = 0;
13443                 if (hold_tcblock == 0) {
13444                         SCTP_TCB_LOCK(stcb);
13445                         hold_tcblock = 1;
13446                 }
13447                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13448                     TAILQ_EMPTY(&asoc->sent_queue) &&
13449                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13450                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13451                                 goto abort_anyway;
13452                         }
13453                         /* there is nothing queued to send, so I'm done... */
13454                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13455                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13456                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13457                                 struct sctp_nets *netp;
13458
13459                                 /* only send SHUTDOWN the first time through */
13460                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13461                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13462                                 }
13463                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13464                                 sctp_stop_timers_for_shutdown(stcb);
13465                                 if (stcb->asoc.alternate) {
13466                                         netp = stcb->asoc.alternate;
13467                                 } else {
13468                                         netp = stcb->asoc.primary_destination;
13469                                 }
13470                                 sctp_send_shutdown(stcb, netp);
13471                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13472                                     netp);
13473                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13474                                     NULL);
13475                         }
13476                 } else {
13477                         /*-
13478                          * we still got (or just got) data to send, so set
13479                          * SHUTDOWN_PENDING
13480                          */
13481                         /*-
13482                          * XXX sockets draft says that SCTP_EOF should be
13483                          * sent with no data.  currently, we will allow user
13484                          * data to be sent first and move to
13485                          * SHUTDOWN-PENDING
13486                          */
13487                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13488                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13489                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13490                                 if (hold_tcblock == 0) {
13491                                         SCTP_TCB_LOCK(stcb);
13492                                         hold_tcblock = 1;
13493                                 }
13494                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13495                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13496                                 }
13497                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13498                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13499                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13500                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13501                                         struct mbuf *op_err;
13502                                         char msg[SCTP_DIAG_INFO_LEN];
13503
13504                         abort_anyway:
13505                                         if (free_cnt_applied) {
13506                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13507                                                 free_cnt_applied = 0;
13508                                         }
13509                                         SCTP_SNPRINTF(msg, sizeof(msg),
13510                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13511                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13512                                             msg);
13513                                         NET_EPOCH_ENTER(et);
13514                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13515                                             op_err, SCTP_SO_LOCKED);
13516                                         NET_EPOCH_EXIT(et);
13517                                         /*
13518                                          * now relock the stcb so everything
13519                                          * is sane
13520                                          */
13521                                         hold_tcblock = 0;
13522                                         stcb = NULL;
13523                                         goto out;
13524                                 }
13525                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13526                                     NULL);
13527                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13528                         }
13529                 }
13530         }
13531 skip_out_eof:
13532         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13533                 some_on_control = 1;
13534         }
13535         if (queue_only_for_init) {
13536                 if (hold_tcblock == 0) {
13537                         SCTP_TCB_LOCK(stcb);
13538                         hold_tcblock = 1;
13539                 }
13540                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13541                         /* a collision took us forward? */
13542                         queue_only = 0;
13543                 } else {
13544                         NET_EPOCH_ENTER(et);
13545                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13546                         NET_EPOCH_EXIT(et);
13547                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13548                         queue_only = 1;
13549                 }
13550         }
13551         if ((net->flight_size > net->cwnd) &&
13552             (stcb->asoc.sctp_cmt_on_off == 0)) {
13553                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13554                 queue_only = 1;
13555         } else if (asoc->ifp_had_enobuf) {
13556                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13557                 if (net->flight_size > (2 * net->mtu)) {
13558                         queue_only = 1;
13559                 }
13560                 asoc->ifp_had_enobuf = 0;
13561         }
13562         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13563         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13564             (stcb->asoc.total_flight > 0) &&
13565             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13566             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13567                 /*-
13568                  * Ok, Nagle is set on and we have data outstanding.
13569                  * Don't send anything and let SACKs drive out the
13570                  * data unless wen have a "full" segment to send.
13571                  */
13572                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13573                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13574                 }
13575                 SCTP_STAT_INCR(sctps_naglequeued);
13576                 nagle_applies = 1;
13577         } else {
13578                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13579                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13580                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13581                 }
13582                 SCTP_STAT_INCR(sctps_naglesent);
13583                 nagle_applies = 0;
13584         }
13585         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13586                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13587                     nagle_applies, un_sent);
13588                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13589                     stcb->asoc.total_flight,
13590                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13591         }
13592         NET_EPOCH_ENTER(et);
13593         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13594                 /* we can attempt to send too. */
13595                 if (hold_tcblock == 0) {
13596                         /*
13597                          * If there is activity recv'ing sacks no need to
13598                          * send
13599                          */
13600                         if (SCTP_TCB_TRYLOCK(stcb)) {
13601                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13602                                 hold_tcblock = 1;
13603                         }
13604                 } else {
13605                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13606                 }
13607         } else if ((queue_only == 0) &&
13608                     (stcb->asoc.peers_rwnd == 0) &&
13609             (stcb->asoc.total_flight == 0)) {
13610                 /* We get to have a probe outstanding */
13611                 if (hold_tcblock == 0) {
13612                         hold_tcblock = 1;
13613                         SCTP_TCB_LOCK(stcb);
13614                 }
13615                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13616         } else if (some_on_control) {
13617                 int num_out, reason, frag_point;
13618
13619                 /* Here we do control only */
13620                 if (hold_tcblock == 0) {
13621                         hold_tcblock = 1;
13622                         SCTP_TCB_LOCK(stcb);
13623                 }
13624                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13625                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13626                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13627         }
13628         NET_EPOCH_EXIT(et);
13629         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13630             queue_only, stcb->asoc.peers_rwnd, un_sent,
13631             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13632             stcb->asoc.total_output_queue_size, error);
13633
13634 out:
13635 out_unlocked:
13636
13637         if (local_soresv && stcb) {
13638                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13639         }
13640         if (create_lock_applied) {
13641                 SCTP_ASOC_CREATE_UNLOCK(inp);
13642         }
13643         if ((stcb) && hold_tcblock) {
13644                 SCTP_TCB_UNLOCK(stcb);
13645         }
13646         if (stcb && free_cnt_applied) {
13647                 atomic_add_int(&stcb->asoc.refcnt, -1);
13648         }
13649 #ifdef INVARIANTS
13650         if (stcb) {
13651                 if (mtx_owned(&stcb->tcb_mtx)) {
13652                         panic("Leaving with tcb mtx owned?");
13653                 }
13654                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13655                         panic("Leaving with tcb send mtx owned?");
13656                 }
13657         }
13658 #endif
13659         if (top) {
13660                 sctp_m_freem(top);
13661         }
13662         if (control) {
13663                 sctp_m_freem(control);
13664         }
13665         return (error);
13666 }
13667
13668 /*
13669  * generate an AUTHentication chunk, if required
13670  */
13671 struct mbuf *
13672 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13673     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13674     struct sctp_tcb *stcb, uint8_t chunk)
13675 {
13676         struct mbuf *m_auth;
13677         struct sctp_auth_chunk *auth;
13678         int chunk_len;
13679         struct mbuf *cn;
13680
13681         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13682             (stcb == NULL))
13683                 return (m);
13684
13685         if (stcb->asoc.auth_supported == 0) {
13686                 return (m);
13687         }
13688         /* does the requested chunk require auth? */
13689         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13690                 return (m);
13691         }
13692         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13693         if (m_auth == NULL) {
13694                 /* no mbuf's */
13695                 return (m);
13696         }
13697         /* reserve some space if this will be the first mbuf */
13698         if (m == NULL)
13699                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13700         /* fill in the AUTH chunk details */
13701         auth = mtod(m_auth, struct sctp_auth_chunk *);
13702         memset(auth, 0, sizeof(*auth));
13703         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13704         auth->ch.chunk_flags = 0;
13705         chunk_len = sizeof(*auth) +
13706             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13707         auth->ch.chunk_length = htons(chunk_len);
13708         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13709         /* key id and hmac digest will be computed and filled in upon send */
13710
13711         /* save the offset where the auth was inserted into the chain */
13712         *offset = 0;
13713         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13714                 *offset += SCTP_BUF_LEN(cn);
13715         }
13716
13717         /* update length and return pointer to the auth chunk */
13718         SCTP_BUF_LEN(m_auth) = chunk_len;
13719         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13720         if (auth_ret != NULL)
13721                 *auth_ret = auth;
13722
13723         return (m);
13724 }
13725
13726 #ifdef INET6
13727 int
13728 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13729 {
13730         struct nd_prefix *pfx = NULL;
13731         struct nd_pfxrouter *pfxrtr = NULL;
13732         struct sockaddr_in6 gw6;
13733
13734         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13735                 return (0);
13736
13737         /* get prefix entry of address */
13738         ND6_RLOCK();
13739         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13740                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13741                         continue;
13742                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13743                     &src6->sin6_addr, &pfx->ndpr_mask))
13744                         break;
13745         }
13746         /* no prefix entry in the prefix list */
13747         if (pfx == NULL) {
13748                 ND6_RUNLOCK();
13749                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13750                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13751                 return (0);
13752         }
13753
13754         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13755         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13756
13757         /* search installed gateway from prefix entry */
13758         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13759                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13760                 gw6.sin6_family = AF_INET6;
13761                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13762                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13763                     sizeof(struct in6_addr));
13764                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13765                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13766                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13767                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13768                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13769                         ND6_RUNLOCK();
13770                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13771                         return (1);
13772                 }
13773         }
13774         ND6_RUNLOCK();
13775         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13776         return (0);
13777 }
13778 #endif
13779
13780 int
13781 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13782 {
13783 #ifdef INET
13784         struct sockaddr_in *sin, *mask;
13785         struct ifaddr *ifa;
13786         struct in_addr srcnetaddr, gwnetaddr;
13787
13788         if (ro == NULL || ro->ro_nh == NULL ||
13789             sifa->address.sa.sa_family != AF_INET) {
13790                 return (0);
13791         }
13792         ifa = (struct ifaddr *)sifa->ifa;
13793         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13794         sin = &sifa->address.sin;
13795         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13796         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13797         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13798         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13799
13800         sin = &ro->ro_nh->gw4_sa;
13801         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13802         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13803         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13804         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13805         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13806                 return (1);
13807         }
13808 #endif
13809         return (0);
13810 }