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 {
2780         struct sctp_ifa *ifa, *sifa;
2781         int num_eligible_addr = 0;
2782 #ifdef INET6
2783         struct sockaddr_in6 sin6, lsa6;
2784
2785         if (fam == AF_INET6) {
2786                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2787                 (void)sa6_recoverscope(&sin6);
2788         }
2789 #endif                          /* INET6 */
2790         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2791 #ifdef INET
2792                 if ((ifa->address.sa.sa_family == AF_INET) &&
2793                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2794                     &ifa->address.sin.sin_addr) != 0)) {
2795                         continue;
2796                 }
2797 #endif
2798 #ifdef INET6
2799                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2800                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2801                     &ifa->address.sin6.sin6_addr) != 0)) {
2802                         continue;
2803                 }
2804 #endif
2805                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2806                     (non_asoc_addr_ok == 0))
2807                         continue;
2808                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2809                     dest_is_priv, fam);
2810                 if (sifa == NULL)
2811                         continue;
2812 #ifdef INET6
2813                 if (fam == AF_INET6 &&
2814                     dest_is_loop &&
2815                     sifa->src_is_loop && sifa->src_is_priv) {
2816                         /*
2817                          * don't allow fe80::1 to be a src on loop ::1, we
2818                          * don't list it to the peer so we will get an
2819                          * abort.
2820                          */
2821                         continue;
2822                 }
2823                 if (fam == AF_INET6 &&
2824                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2825                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2826                         /*
2827                          * link-local <-> link-local must belong to the same
2828                          * scope.
2829                          */
2830                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2831                         (void)sa6_recoverscope(&lsa6);
2832                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2833                                 continue;
2834                         }
2835                 }
2836 #endif                          /* INET6 */
2837
2838                 /*
2839                  * Check if the IPv6 address matches to next-hop. In the
2840                  * mobile case, old IPv6 address may be not deleted from the
2841                  * interface. Then, the interface has previous and new
2842                  * addresses.  We should use one corresponding to the
2843                  * next-hop.  (by micchie)
2844                  */
2845 #ifdef INET6
2846                 if (stcb && fam == AF_INET6 &&
2847                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2848                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2849                             == 0) {
2850                                 continue;
2851                         }
2852                 }
2853 #endif
2854 #ifdef INET
2855                 /* Avoid topologically incorrect IPv4 address */
2856                 if (stcb && fam == AF_INET &&
2857                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2858                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2859                                 continue;
2860                         }
2861                 }
2862 #endif
2863                 if (stcb) {
2864                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2865                                 continue;
2866                         }
2867                         if (((non_asoc_addr_ok == 0) &&
2868                             (sctp_is_addr_restricted(stcb, sifa))) ||
2869                             (non_asoc_addr_ok &&
2870                             (sctp_is_addr_restricted(stcb, sifa)) &&
2871                             (!sctp_is_addr_pending(stcb, sifa)))) {
2872                                 /*
2873                                  * It is restricted for some reason..
2874                                  * probably not yet added.
2875                                  */
2876                                 continue;
2877                         }
2878                 }
2879                 if (num_eligible_addr >= addr_wanted) {
2880                         return (sifa);
2881                 }
2882                 num_eligible_addr++;
2883         }
2884         return (NULL);
2885 }
2886
2887 static int
2888 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2889     struct sctp_inpcb *inp,
2890     struct sctp_tcb *stcb,
2891     int non_asoc_addr_ok,
2892     uint8_t dest_is_loop,
2893     uint8_t dest_is_priv,
2894     sa_family_t fam)
2895 {
2896         struct sctp_ifa *ifa, *sifa;
2897         int num_eligible_addr = 0;
2898
2899         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2900 #ifdef INET
2901                 if ((ifa->address.sa.sa_family == AF_INET) &&
2902                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2903                     &ifa->address.sin.sin_addr) != 0)) {
2904                         continue;
2905                 }
2906 #endif
2907 #ifdef INET6
2908                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2909                     (stcb != NULL) &&
2910                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2911                     &ifa->address.sin6.sin6_addr) != 0)) {
2912                         continue;
2913                 }
2914 #endif
2915                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2916                     (non_asoc_addr_ok == 0)) {
2917                         continue;
2918                 }
2919                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2920                     dest_is_priv, fam);
2921                 if (sifa == NULL) {
2922                         continue;
2923                 }
2924                 if (stcb) {
2925                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2926                                 continue;
2927                         }
2928                         if (((non_asoc_addr_ok == 0) &&
2929                             (sctp_is_addr_restricted(stcb, sifa))) ||
2930                             (non_asoc_addr_ok &&
2931                             (sctp_is_addr_restricted(stcb, sifa)) &&
2932                             (!sctp_is_addr_pending(stcb, sifa)))) {
2933                                 /*
2934                                  * It is restricted for some reason..
2935                                  * probably not yet added.
2936                                  */
2937                                 continue;
2938                         }
2939                 }
2940                 num_eligible_addr++;
2941         }
2942         return (num_eligible_addr);
2943 }
2944
2945 static struct sctp_ifa *
2946 sctp_choose_boundall(struct sctp_inpcb *inp,
2947     struct sctp_tcb *stcb,
2948     struct sctp_nets *net,
2949     sctp_route_t *ro,
2950     uint32_t vrf_id,
2951     uint8_t dest_is_priv,
2952     uint8_t dest_is_loop,
2953     int non_asoc_addr_ok,
2954     sa_family_t fam)
2955 {
2956         int cur_addr_num = 0, num_preferred = 0;
2957         void *ifn;
2958         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2959         struct sctp_ifa *sctp_ifa, *sifa;
2960         uint32_t ifn_index;
2961         struct sctp_vrf *vrf;
2962 #ifdef INET
2963         int retried = 0;
2964 #endif
2965
2966         /*-
2967          * For boundall we can use any address in the association.
2968          * If non_asoc_addr_ok is set we can use any address (at least in
2969          * theory). So we look for preferred addresses first. If we find one,
2970          * we use it. Otherwise we next try to get an address on the
2971          * interface, which we should be able to do (unless non_asoc_addr_ok
2972          * is false and we are routed out that way). In these cases where we
2973          * can't use the address of the interface we go through all the
2974          * ifn's looking for an address we can use and fill that in. Punting
2975          * means we send back address 0, which will probably cause problems
2976          * actually since then IP will fill in the address of the route ifn,
2977          * which means we probably already rejected it.. i.e. here comes an
2978          * abort :-<.
2979          */
2980         vrf = sctp_find_vrf(vrf_id);
2981         if (vrf == NULL)
2982                 return (NULL);
2983
2984         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2985         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2986         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2987         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2988         if (sctp_ifn == NULL) {
2989                 /* ?? We don't have this guy ?? */
2990                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2991                 goto bound_all_plan_b;
2992         }
2993         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2994             ifn_index, sctp_ifn->ifn_name);
2995
2996         if (net) {
2997                 cur_addr_num = net->indx_of_eligible_next_to_use;
2998         }
2999         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3000             inp, stcb,
3001             non_asoc_addr_ok,
3002             dest_is_loop,
3003             dest_is_priv, fam);
3004         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3005             num_preferred, sctp_ifn->ifn_name);
3006         if (num_preferred == 0) {
3007                 /*
3008                  * no eligible addresses, we must use some other interface
3009                  * address if we can find one.
3010                  */
3011                 goto bound_all_plan_b;
3012         }
3013         /*
3014          * Ok we have num_eligible_addr set with how many we can use, this
3015          * may vary from call to call due to addresses being deprecated
3016          * etc..
3017          */
3018         if (cur_addr_num >= num_preferred) {
3019                 cur_addr_num = 0;
3020         }
3021         /*
3022          * select the nth address from the list (where cur_addr_num is the
3023          * nth) and 0 is the first one, 1 is the second one etc...
3024          */
3025         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3026
3027         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3028             dest_is_priv, cur_addr_num, fam, ro);
3029
3030         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3031         if (sctp_ifa) {
3032                 atomic_add_int(&sctp_ifa->refcount, 1);
3033                 if (net) {
3034                         /* save off where the next one we will want */
3035                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3036                 }
3037                 return (sctp_ifa);
3038         }
3039         /*
3040          * plan_b: Look at all interfaces and find a preferred address. If
3041          * no preferred fall through to plan_c.
3042          */
3043 bound_all_plan_b:
3044         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3045         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3046                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3047                     sctp_ifn->ifn_name);
3048                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3049                         /* wrong base scope */
3050                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3051                         continue;
3052                 }
3053                 if ((sctp_ifn == looked_at) && looked_at) {
3054                         /* already looked at this guy */
3055                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3056                         continue;
3057                 }
3058                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3059                     dest_is_loop, dest_is_priv, fam);
3060                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3061                     "Found ifn:%p %d preferred source addresses\n",
3062                     ifn, num_preferred);
3063                 if (num_preferred == 0) {
3064                         /* None on this interface. */
3065                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3066                         continue;
3067                 }
3068                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3069                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3070                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3071
3072                 /*
3073                  * Ok we have num_eligible_addr set with how many we can
3074                  * use, this may vary from call to call due to addresses
3075                  * being deprecated etc..
3076                  */
3077                 if (cur_addr_num >= num_preferred) {
3078                         cur_addr_num = 0;
3079                 }
3080                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3081                     dest_is_priv, cur_addr_num, fam, ro);
3082                 if (sifa == NULL)
3083                         continue;
3084                 if (net) {
3085                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3086                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3087                             cur_addr_num);
3088                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3089                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3090                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3091                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3092                 }
3093                 atomic_add_int(&sifa->refcount, 1);
3094                 return (sifa);
3095         }
3096 #ifdef INET
3097 again_with_private_addresses_allowed:
3098 #endif
3099         /* plan_c: do we have an acceptable address on the emit interface */
3100         sifa = NULL;
3101         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3102         if (emit_ifn == NULL) {
3103                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3104                 goto plan_d;
3105         }
3106         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3107                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3108 #ifdef INET
3109                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3110                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3111                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3112                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3113                         continue;
3114                 }
3115 #endif
3116 #ifdef INET6
3117                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3118                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3119                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3120                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3121                         continue;
3122                 }
3123 #endif
3124                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3125                     (non_asoc_addr_ok == 0)) {
3126                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3127                         continue;
3128                 }
3129                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3130                     dest_is_priv, fam);
3131                 if (sifa == NULL) {
3132                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3133                         continue;
3134                 }
3135                 if (stcb) {
3136                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3137                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3138                                 sifa = NULL;
3139                                 continue;
3140                         }
3141                         if (((non_asoc_addr_ok == 0) &&
3142                             (sctp_is_addr_restricted(stcb, sifa))) ||
3143                             (non_asoc_addr_ok &&
3144                             (sctp_is_addr_restricted(stcb, sifa)) &&
3145                             (!sctp_is_addr_pending(stcb, sifa)))) {
3146                                 /*
3147                                  * It is restricted for some reason..
3148                                  * probably not yet added.
3149                                  */
3150                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3151                                 sifa = NULL;
3152                                 continue;
3153                         }
3154                 }
3155                 atomic_add_int(&sifa->refcount, 1);
3156                 goto out;
3157         }
3158 plan_d:
3159         /*
3160          * plan_d: We are in trouble. No preferred address on the emit
3161          * interface. And not even a preferred address on all interfaces. Go
3162          * out and see if we can find an acceptable address somewhere
3163          * amongst all interfaces.
3164          */
3165         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3166         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3167                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3168                         /* wrong base scope */
3169                         continue;
3170                 }
3171                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3172 #ifdef INET
3173                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3174                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3175                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3176                                 continue;
3177                         }
3178 #endif
3179 #ifdef INET6
3180                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3181                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3182                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3183                                 continue;
3184                         }
3185 #endif
3186                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3187                             (non_asoc_addr_ok == 0))
3188                                 continue;
3189                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3190                             dest_is_loop,
3191                             dest_is_priv, fam);
3192                         if (sifa == NULL)
3193                                 continue;
3194                         if (stcb) {
3195                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3196                                         sifa = NULL;
3197                                         continue;
3198                                 }
3199                                 if (((non_asoc_addr_ok == 0) &&
3200                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3201                                     (non_asoc_addr_ok &&
3202                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3203                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3204                                         /*
3205                                          * It is restricted for some
3206                                          * reason.. probably not yet added.
3207                                          */
3208                                         sifa = NULL;
3209                                         continue;
3210                                 }
3211                         }
3212                         goto out;
3213                 }
3214         }
3215 #ifdef INET
3216         if (stcb) {
3217                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3218                         stcb->asoc.scope.ipv4_local_scope = 1;
3219                         retried = 1;
3220                         goto again_with_private_addresses_allowed;
3221                 } else if (retried == 1) {
3222                         stcb->asoc.scope.ipv4_local_scope = 0;
3223                 }
3224         }
3225 #endif
3226 out:
3227 #ifdef INET
3228         if (sifa) {
3229                 if (retried == 1) {
3230                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3231                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3232                                         /* wrong base scope */
3233                                         continue;
3234                                 }
3235                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3236                                         struct sctp_ifa *tmp_sifa;
3237
3238 #ifdef INET
3239                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3240                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3241                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3242                                                 continue;
3243                                         }
3244 #endif
3245 #ifdef INET6
3246                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3247                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3248                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3249                                                 continue;
3250                                         }
3251 #endif
3252                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3253                                             (non_asoc_addr_ok == 0))
3254                                                 continue;
3255                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3256                                             dest_is_loop,
3257                                             dest_is_priv, fam);
3258                                         if (tmp_sifa == NULL) {
3259                                                 continue;
3260                                         }
3261                                         if (tmp_sifa == sifa) {
3262                                                 continue;
3263                                         }
3264                                         if (stcb) {
3265                                                 if (sctp_is_address_in_scope(tmp_sifa,
3266                                                     &stcb->asoc.scope, 0) == 0) {
3267                                                         continue;
3268                                                 }
3269                                                 if (((non_asoc_addr_ok == 0) &&
3270                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3271                                                     (non_asoc_addr_ok &&
3272                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3273                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3274                                                         /*
3275                                                          * It is restricted
3276                                                          * for some reason..
3277                                                          * probably not yet
3278                                                          * added.
3279                                                          */
3280                                                         continue;
3281                                                 }
3282                                         }
3283                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3284                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3285                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3286                                         }
3287                                 }
3288                         }
3289                 }
3290                 atomic_add_int(&sifa->refcount, 1);
3291         }
3292 #endif
3293         return (sifa);
3294 }
3295
3296 /* tcb may be NULL */
3297 struct sctp_ifa *
3298 sctp_source_address_selection(struct sctp_inpcb *inp,
3299     struct sctp_tcb *stcb,
3300     sctp_route_t *ro,
3301     struct sctp_nets *net,
3302     int non_asoc_addr_ok, uint32_t vrf_id)
3303 {
3304         struct sctp_ifa *answer;
3305         uint8_t dest_is_priv, dest_is_loop;
3306         sa_family_t fam;
3307 #ifdef INET
3308         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3309 #endif
3310 #ifdef INET6
3311         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3312 #endif
3313
3314         /**
3315          * Rules:
3316          * - Find the route if needed, cache if I can.
3317          * - Look at interface address in route, Is it in the bound list. If so we
3318          *   have the best source.
3319          * - If not we must rotate amongst the addresses.
3320          *
3321          * Cavets and issues
3322          *
3323          * Do we need to pay attention to scope. We can have a private address
3324          * or a global address we are sourcing or sending to. So if we draw
3325          * it out
3326          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3327          * For V4
3328          * ------------------------------------------
3329          *      source     *      dest  *  result
3330          * -----------------------------------------
3331          * <a>  Private    *    Global  *  NAT
3332          * -----------------------------------------
3333          * <b>  Private    *    Private *  No problem
3334          * -----------------------------------------
3335          * <c>  Global     *    Private *  Huh, How will this work?
3336          * -----------------------------------------
3337          * <d>  Global     *    Global  *  No Problem
3338          *------------------------------------------
3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340          * For V6
3341          *------------------------------------------
3342          *      source     *      dest  *  result
3343          * -----------------------------------------
3344          * <a>  Linklocal  *    Global  *
3345          * -----------------------------------------
3346          * <b>  Linklocal  * Linklocal  *  No problem
3347          * -----------------------------------------
3348          * <c>  Global     * Linklocal  *  Huh, How will this work?
3349          * -----------------------------------------
3350          * <d>  Global     *    Global  *  No Problem
3351          *------------------------------------------
3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353          *
3354          * And then we add to that what happens if there are multiple addresses
3355          * assigned to an interface. Remember the ifa on a ifn is a linked
3356          * list of addresses. So one interface can have more than one IP
3357          * address. What happens if we have both a private and a global
3358          * address? Do we then use context of destination to sort out which
3359          * one is best? And what about NAT's sending P->G may get you a NAT
3360          * translation, or should you select the G thats on the interface in
3361          * preference.
3362          *
3363          * Decisions:
3364          *
3365          * - count the number of addresses on the interface.
3366          * - if it is one, no problem except case <c>.
3367          *   For <a> we will assume a NAT out there.
3368          * - if there are more than one, then we need to worry about scope P
3369          *   or G. We should prefer G -> G and P -> P if possible.
3370          *   Then as a secondary fall back to mixed types G->P being a last
3371          *   ditch one.
3372          * - The above all works for bound all, but bound specific we need to
3373          *   use the same concept but instead only consider the bound
3374          *   addresses. If the bound set is NOT assigned to the interface then
3375          *   we must use rotation amongst the bound addresses..
3376          */
3377         if (ro->ro_nh == NULL) {
3378                 /*
3379                  * Need a route to cache.
3380                  */
3381                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3382         }
3383         if (ro->ro_nh == NULL) {
3384                 return (NULL);
3385         }
3386         fam = ro->ro_dst.sa_family;
3387         dest_is_priv = dest_is_loop = 0;
3388         /* Setup our scopes for the destination */
3389         switch (fam) {
3390 #ifdef INET
3391         case AF_INET:
3392                 /* Scope based on outbound address */
3393                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3394                         dest_is_loop = 1;
3395                         if (net != NULL) {
3396                                 /* mark it as local */
3397                                 net->addr_is_local = 1;
3398                         }
3399                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3400                         dest_is_priv = 1;
3401                 }
3402                 break;
3403 #endif
3404 #ifdef INET6
3405         case AF_INET6:
3406                 /* Scope based on outbound address */
3407                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3408                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3409                         /*
3410                          * If the address is a loopback address, which
3411                          * consists of "::1" OR "fe80::1%lo0", we are
3412                          * loopback scope. But we don't use dest_is_priv
3413                          * (link local addresses).
3414                          */
3415                         dest_is_loop = 1;
3416                         if (net != NULL) {
3417                                 /* mark it as local */
3418                                 net->addr_is_local = 1;
3419                         }
3420                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3421                         dest_is_priv = 1;
3422                 }
3423                 break;
3424 #endif
3425         }
3426         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3427         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3428         SCTP_IPI_ADDR_RLOCK();
3429         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3430                 /*
3431                  * Bound all case
3432                  */
3433                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3434                     dest_is_priv, dest_is_loop,
3435                     non_asoc_addr_ok, fam);
3436                 SCTP_IPI_ADDR_RUNLOCK();
3437                 return (answer);
3438         }
3439         /*
3440          * Subset bound case
3441          */
3442         if (stcb) {
3443                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3444                     vrf_id, dest_is_priv,
3445                     dest_is_loop,
3446                     non_asoc_addr_ok, fam);
3447         } else {
3448                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3449                     non_asoc_addr_ok,
3450                     dest_is_priv,
3451                     dest_is_loop, fam);
3452         }
3453         SCTP_IPI_ADDR_RUNLOCK();
3454         return (answer);
3455 }
3456
3457 static int
3458 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3459 {
3460         struct cmsghdr cmh;
3461         struct sctp_sndinfo sndinfo;
3462         struct sctp_prinfo prinfo;
3463         struct sctp_authinfo authinfo;
3464         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3465         int found;
3466
3467         /*
3468          * Independent of how many mbufs, find the c_type inside the control
3469          * structure and copy out the data.
3470          */
3471         found = 0;
3472         tot_len = SCTP_BUF_LEN(control);
3473         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3474                 rem_len = tot_len - off;
3475                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3476                         /* There is not enough room for one more. */
3477                         return (found);
3478                 }
3479                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3480                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3481                         /* We dont't have a complete CMSG header. */
3482                         return (found);
3483                 }
3484                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3485                         /* We don't have the complete CMSG. */
3486                         return (found);
3487                 }
3488                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3489                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3490                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3491                     ((c_type == cmh.cmsg_type) ||
3492                     ((c_type == SCTP_SNDRCV) &&
3493                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3494                     (cmh.cmsg_type == SCTP_PRINFO) ||
3495                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3496                         if (c_type == cmh.cmsg_type) {
3497                                 if (cpsize > INT_MAX) {
3498                                         return (found);
3499                                 }
3500                                 if (cmsg_data_len < (int)cpsize) {
3501                                         return (found);
3502                                 }
3503                                 /* It is exactly what we want. Copy it out. */
3504                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3505                                 return (1);
3506                         } else {
3507                                 struct sctp_sndrcvinfo *sndrcvinfo;
3508
3509                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3510                                 if (found == 0) {
3511                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3512                                                 return (found);
3513                                         }
3514                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3515                                 }
3516                                 switch (cmh.cmsg_type) {
3517                                 case SCTP_SNDINFO:
3518                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3519                                                 return (found);
3520                                         }
3521                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3522                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3523                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3524                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3525                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3526                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3527                                         break;
3528                                 case SCTP_PRINFO:
3529                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3530                                                 return (found);
3531                                         }
3532                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3533                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3534                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3535                                         } else {
3536                                                 sndrcvinfo->sinfo_timetolive = 0;
3537                                         }
3538                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3539                                         break;
3540                                 case SCTP_AUTHINFO:
3541                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3542                                                 return (found);
3543                                         }
3544                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3545                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3546                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3547                                         break;
3548                                 default:
3549                                         return (found);
3550                                 }
3551                                 found = 1;
3552                         }
3553                 }
3554         }
3555         return (found);
3556 }
3557
3558 static int
3559 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3560 {
3561         struct cmsghdr cmh;
3562         struct sctp_initmsg initmsg;
3563 #ifdef INET
3564         struct sockaddr_in sin;
3565 #endif
3566 #ifdef INET6
3567         struct sockaddr_in6 sin6;
3568 #endif
3569         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3570
3571         tot_len = SCTP_BUF_LEN(control);
3572         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3573                 rem_len = tot_len - off;
3574                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3575                         /* There is not enough room for one more. */
3576                         *error = EINVAL;
3577                         return (1);
3578                 }
3579                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3580                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3581                         /* We dont't have a complete CMSG header. */
3582                         *error = EINVAL;
3583                         return (1);
3584                 }
3585                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3586                         /* We don't have the complete CMSG. */
3587                         *error = EINVAL;
3588                         return (1);
3589                 }
3590                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3591                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3592                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3593                         switch (cmh.cmsg_type) {
3594                         case SCTP_INIT:
3595                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3596                                         *error = EINVAL;
3597                                         return (1);
3598                                 }
3599                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3600                                 if (initmsg.sinit_max_attempts)
3601                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3602                                 if (initmsg.sinit_num_ostreams)
3603                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3604                                 if (initmsg.sinit_max_instreams)
3605                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3606                                 if (initmsg.sinit_max_init_timeo)
3607                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3608                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3609                                         struct sctp_stream_out *tmp_str;
3610                                         unsigned int i;
3611 #if defined(SCTP_DETAILED_STR_STATS)
3612                                         int j;
3613 #endif
3614
3615                                         /* Default is NOT correct */
3616                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3617                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3618                                         SCTP_TCB_UNLOCK(stcb);
3619                                         SCTP_MALLOC(tmp_str,
3620                                             struct sctp_stream_out *,
3621                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3622                                             SCTP_M_STRMO);
3623                                         SCTP_TCB_LOCK(stcb);
3624                                         if (tmp_str != NULL) {
3625                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3626                                                 stcb->asoc.strmout = tmp_str;
3627                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3628                                         } else {
3629                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3630                                         }
3631                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3632                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3633                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3634                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3635                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3636 #if defined(SCTP_DETAILED_STR_STATS)
3637                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3638                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3639                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3640                                                 }
3641 #else
3642                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3643                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3644 #endif
3645                                                 stcb->asoc.strmout[i].sid = i;
3646                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3649                                         }
3650                                 }
3651                                 break;
3652 #ifdef INET
3653                         case SCTP_DSTADDRV4:
3654                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3655                                         *error = EINVAL;
3656                                         return (1);
3657                                 }
3658                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3659                                 sin.sin_family = AF_INET;
3660                                 sin.sin_len = sizeof(struct sockaddr_in);
3661                                 sin.sin_port = stcb->rport;
3662                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3663                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3664                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3665                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3670                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3671                                         *error = ENOBUFS;
3672                                         return (1);
3673                                 }
3674                                 break;
3675 #endif
3676 #ifdef INET6
3677                         case SCTP_DSTADDRV6:
3678                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3683                                 sin6.sin6_family = AF_INET6;
3684                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3685                                 sin6.sin6_port = stcb->rport;
3686                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3687                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3688                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692 #ifdef INET
3693                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3694                                         in6_sin6_2_sin(&sin, &sin6);
3695                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3696                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3697                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3698                                                 *error = EINVAL;
3699                                                 return (1);
3700                                         }
3701                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3702                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703                                                 *error = ENOBUFS;
3704                                                 return (1);
3705                                         }
3706                                 } else
3707 #endif
3708                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3709                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710                                         *error = ENOBUFS;
3711                                         return (1);
3712                                 }
3713                                 break;
3714 #endif
3715                         default:
3716                                 break;
3717                         }
3718                 }
3719         }
3720         return (0);
3721 }
3722
3723 #if defined(INET) || defined(INET6)
3724 static struct sctp_tcb *
3725 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3726     uint16_t port,
3727     struct mbuf *control,
3728     struct sctp_nets **net_p,
3729     int *error)
3730 {
3731         struct cmsghdr cmh;
3732         struct sctp_tcb *stcb;
3733         struct sockaddr *addr;
3734 #ifdef INET
3735         struct sockaddr_in sin;
3736 #endif
3737 #ifdef INET6
3738         struct sockaddr_in6 sin6;
3739 #endif
3740         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3741
3742         tot_len = SCTP_BUF_LEN(control);
3743         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3744                 rem_len = tot_len - off;
3745                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3746                         /* There is not enough room for one more. */
3747                         *error = EINVAL;
3748                         return (NULL);
3749                 }
3750                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3751                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3752                         /* We dont't have a complete CMSG header. */
3753                         *error = EINVAL;
3754                         return (NULL);
3755                 }
3756                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3757                         /* We don't have the complete CMSG. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3762                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3763                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3764                         switch (cmh.cmsg_type) {
3765 #ifdef INET
3766                         case SCTP_DSTADDRV4:
3767                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3768                                         *error = EINVAL;
3769                                         return (NULL);
3770                                 }
3771                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3772                                 sin.sin_family = AF_INET;
3773                                 sin.sin_len = sizeof(struct sockaddr_in);
3774                                 sin.sin_port = port;
3775                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3776                                 addr = (struct sockaddr *)&sin;
3777                                 break;
3778 #endif
3779 #ifdef INET6
3780                         case SCTP_DSTADDRV6:
3781                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3782                                         *error = EINVAL;
3783                                         return (NULL);
3784                                 }
3785                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3786                                 sin6.sin6_family = AF_INET6;
3787                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3788                                 sin6.sin6_port = port;
3789                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3790 #ifdef INET
3791                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3792                                         in6_sin6_2_sin(&sin, &sin6);
3793                                         addr = (struct sockaddr *)&sin;
3794                                 } else
3795 #endif
3796                                         addr = (struct sockaddr *)&sin6;
3797                                 break;
3798 #endif
3799                         default:
3800                                 addr = NULL;
3801                                 break;
3802                         }
3803                         if (addr) {
3804                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3805                                 if (stcb != NULL) {
3806                                         return (stcb);
3807                                 }
3808                         }
3809                 }
3810         }
3811         return (NULL);
3812 }
3813 #endif
3814
3815 static struct mbuf *
3816 sctp_add_cookie(struct mbuf *init, int init_offset,
3817     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3818 {
3819         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3820         struct sctp_state_cookie *stc;
3821         struct sctp_paramhdr *ph;
3822         uint16_t cookie_sz;
3823
3824         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3825             sizeof(struct sctp_paramhdr)), 0,
3826             M_NOWAIT, 1, MT_DATA);
3827         if (mret == NULL) {
3828                 return (NULL);
3829         }
3830         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3831         if (copy_init == NULL) {
3832                 sctp_m_freem(mret);
3833                 return (NULL);
3834         }
3835 #ifdef SCTP_MBUF_LOGGING
3836         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3837                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3838         }
3839 #endif
3840         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3841             M_NOWAIT);
3842         if (copy_initack == NULL) {
3843                 sctp_m_freem(mret);
3844                 sctp_m_freem(copy_init);
3845                 return (NULL);
3846         }
3847 #ifdef SCTP_MBUF_LOGGING
3848         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3850         }
3851 #endif
3852         /* easy side we just drop it on the end */
3853         ph = mtod(mret, struct sctp_paramhdr *);
3854         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3855             sizeof(struct sctp_paramhdr);
3856         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3857             sizeof(struct sctp_paramhdr));
3858         ph->param_type = htons(SCTP_STATE_COOKIE);
3859         ph->param_length = 0;   /* fill in at the end */
3860         /* Fill in the stc cookie data */
3861         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3862
3863         /* tack the INIT and then the INIT-ACK onto the chain */
3864         cookie_sz = 0;
3865         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3866                 cookie_sz += SCTP_BUF_LEN(m_at);
3867                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3868                         SCTP_BUF_NEXT(m_at) = copy_init;
3869                         break;
3870                 }
3871         }
3872         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873                 cookie_sz += SCTP_BUF_LEN(m_at);
3874                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3875                         SCTP_BUF_NEXT(m_at) = copy_initack;
3876                         break;
3877                 }
3878         }
3879         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880                 cookie_sz += SCTP_BUF_LEN(m_at);
3881                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3882                         break;
3883                 }
3884         }
3885         sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3886         if (sig == NULL) {
3887                 /* no space, so free the entire chain */
3888                 sctp_m_freem(mret);
3889                 return (NULL);
3890         }
3891         SCTP_BUF_NEXT(m_at) = sig;
3892         SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
3893         cookie_sz += SCTP_SIGNATURE_SIZE;
3894         ph->param_length = htons(cookie_sz);
3895         *signature = (uint8_t *)mtod(sig, caddr_t);
3896         memset(*signature, 0, SCTP_SIGNATURE_SIZE);
3897         return (mret);
3898 }
3899
3900 static uint8_t
3901 sctp_get_ect(struct sctp_tcb *stcb)
3902 {
3903         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3904                 return (SCTP_ECT0_BIT);
3905         } else {
3906                 return (0);
3907         }
3908 }
3909
3910 #if defined(INET) || defined(INET6)
3911 static void
3912 sctp_handle_no_route(struct sctp_tcb *stcb,
3913     struct sctp_nets *net,
3914     int so_locked)
3915 {
3916         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3917
3918         if (net) {
3919                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3920                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3921                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3922                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3923                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3924                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3925                                     stcb, 0,
3926                                     (void *)net,
3927                                     so_locked);
3928                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3929                                 net->dest_state &= ~SCTP_ADDR_PF;
3930                         }
3931                 }
3932                 if (stcb) {
3933                         if (net == stcb->asoc.primary_destination) {
3934                                 /* need a new primary */
3935                                 struct sctp_nets *alt;
3936
3937                                 alt = sctp_find_alternate_net(stcb, net, 0);
3938                                 if (alt != net) {
3939                                         if (stcb->asoc.alternate) {
3940                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3941                                         }
3942                                         stcb->asoc.alternate = alt;
3943                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3944                                         if (net->ro._s_addr) {
3945                                                 sctp_free_ifa(net->ro._s_addr);
3946                                                 net->ro._s_addr = NULL;
3947                                         }
3948                                         net->src_addr_selected = 0;
3949                                 }
3950                         }
3951                 }
3952         }
3953 }
3954 #endif
3955
3956 static int
3957 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3958     struct sctp_tcb *stcb,      /* may be NULL */
3959     struct sctp_nets *net,
3960     struct sockaddr *to,
3961     struct mbuf *m,
3962     uint32_t auth_offset,
3963     struct sctp_auth_chunk *auth,
3964     uint16_t auth_keyid,
3965     int nofragment_flag,
3966     int ecn_ok,
3967     int out_of_asoc_ok,
3968     uint16_t src_port,
3969     uint16_t dest_port,
3970     uint32_t v_tag,
3971     uint16_t port,
3972     union sctp_sockstore *over_addr,
3973     uint8_t mflowtype, uint32_t mflowid,
3974     int so_locked)
3975 {
3976 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3977         /**
3978          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3979          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3980          * - fill in the HMAC digest of any AUTH chunk in the packet.
3981          * - calculate and fill in the SCTP checksum.
3982          * - prepend an IP address header.
3983          * - if boundall use INADDR_ANY.
3984          * - if boundspecific do source address selection.
3985          * - set fragmentation option for ipV4.
3986          * - On return from IP output, check/adjust mtu size of output
3987          *   interface and smallest_mtu size as well.
3988          */
3989         /* Will need ifdefs around this */
3990         struct mbuf *newm;
3991         struct sctphdr *sctphdr;
3992         int packet_length;
3993         int ret;
3994 #if defined(INET) || defined(INET6)
3995         uint32_t vrf_id;
3996 #endif
3997 #if defined(INET) || defined(INET6)
3998         struct mbuf *o_pak;
3999         sctp_route_t *ro = NULL;
4000         struct udphdr *udp = NULL;
4001 #endif
4002         uint8_t tos_value;
4003
4004         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4005                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4006                 sctp_m_freem(m);
4007                 return (EFAULT);
4008         }
4009 #if defined(INET) || defined(INET6)
4010         if (stcb) {
4011                 vrf_id = stcb->asoc.vrf_id;
4012         } else {
4013                 vrf_id = inp->def_vrf_id;
4014         }
4015 #endif
4016         /* fill in the HMAC digest for any AUTH chunk in the packet */
4017         if ((auth != NULL) && (stcb != NULL)) {
4018                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4019         }
4020
4021         if (net) {
4022                 tos_value = net->dscp;
4023         } else if (stcb) {
4024                 tos_value = stcb->asoc.default_dscp;
4025         } else {
4026                 tos_value = inp->sctp_ep.default_dscp;
4027         }
4028
4029         switch (to->sa_family) {
4030 #ifdef INET
4031         case AF_INET:
4032                 {
4033                         struct ip *ip = NULL;
4034                         sctp_route_t iproute;
4035                         int len;
4036
4037                         len = SCTP_MIN_V4_OVERHEAD;
4038                         if (port) {
4039                                 len += sizeof(struct udphdr);
4040                         }
4041                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4042                         if (newm == NULL) {
4043                                 sctp_m_freem(m);
4044                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4045                                 return (ENOMEM);
4046                         }
4047                         SCTP_ALIGN_TO_END(newm, len);
4048                         SCTP_BUF_LEN(newm) = len;
4049                         SCTP_BUF_NEXT(newm) = m;
4050                         m = newm;
4051                         if (net != NULL) {
4052                                 m->m_pkthdr.flowid = net->flowid;
4053                                 M_HASHTYPE_SET(m, net->flowtype);
4054                         } else {
4055                                 m->m_pkthdr.flowid = mflowid;
4056                                 M_HASHTYPE_SET(m, mflowtype);
4057                         }
4058                         packet_length = sctp_calculate_len(m);
4059                         ip = mtod(m, struct ip *);
4060                         ip->ip_v = IPVERSION;
4061                         ip->ip_hl = (sizeof(struct ip) >> 2);
4062                         if (tos_value == 0) {
4063                                 /*
4064                                  * This means especially, that it is not set
4065                                  * at the SCTP layer. So use the value from
4066                                  * the IP layer.
4067                                  */
4068                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4069                         }
4070                         tos_value &= 0xfc;
4071                         if (ecn_ok) {
4072                                 tos_value |= sctp_get_ect(stcb);
4073                         }
4074                         if ((nofragment_flag) && (port == 0)) {
4075                                 ip->ip_off = htons(IP_DF);
4076                         } else {
4077                                 ip->ip_off = htons(0);
4078                         }
4079                         /* FreeBSD has a function for ip_id's */
4080                         ip_fillid(ip);
4081
4082                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4083                         ip->ip_len = htons(packet_length);
4084                         ip->ip_tos = tos_value;
4085                         if (port) {
4086                                 ip->ip_p = IPPROTO_UDP;
4087                         } else {
4088                                 ip->ip_p = IPPROTO_SCTP;
4089                         }
4090                         ip->ip_sum = 0;
4091                         if (net == NULL) {
4092                                 ro = &iproute;
4093                                 memset(&iproute, 0, sizeof(iproute));
4094                                 memcpy(&ro->ro_dst, to, to->sa_len);
4095                         } else {
4096                                 ro = (sctp_route_t *)&net->ro;
4097                         }
4098                         /* Now the address selection part */
4099                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4100
4101                         /* call the routine to select the src address */
4102                         if (net && out_of_asoc_ok == 0) {
4103                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4104                                         sctp_free_ifa(net->ro._s_addr);
4105                                         net->ro._s_addr = NULL;
4106                                         net->src_addr_selected = 0;
4107                                         RO_NHFREE(ro);
4108                                 }
4109                                 if (net->src_addr_selected == 0) {
4110                                         /* Cache the source address */
4111                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4112                                             ro, net, 0,
4113                                             vrf_id);
4114                                         net->src_addr_selected = 1;
4115                                 }
4116                                 if (net->ro._s_addr == NULL) {
4117                                         /* No route to host */
4118                                         net->src_addr_selected = 0;
4119                                         sctp_handle_no_route(stcb, net, so_locked);
4120                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4121                                         sctp_m_freem(m);
4122                                         return (EHOSTUNREACH);
4123                                 }
4124                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4125                         } else {
4126                                 if (over_addr == NULL) {
4127                                         struct sctp_ifa *_lsrc;
4128
4129                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4130                                             net,
4131                                             out_of_asoc_ok,
4132                                             vrf_id);
4133                                         if (_lsrc == NULL) {
4134                                                 sctp_handle_no_route(stcb, net, so_locked);
4135                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4136                                                 sctp_m_freem(m);
4137                                                 return (EHOSTUNREACH);
4138                                         }
4139                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4140                                         sctp_free_ifa(_lsrc);
4141                                 } else {
4142                                         ip->ip_src = over_addr->sin.sin_addr;
4143                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4144                                 }
4145                         }
4146                         if (port) {
4147                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4148                                         sctp_handle_no_route(stcb, net, so_locked);
4149                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150                                         sctp_m_freem(m);
4151                                         return (EHOSTUNREACH);
4152                                 }
4153                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4154                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4155                                 udp->uh_dport = port;
4156                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4157                                 if (V_udp_cksum) {
4158                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4159                                 } else {
4160                                         udp->uh_sum = 0;
4161                                 }
4162                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4163                         } else {
4164                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4165                         }
4166
4167                         sctphdr->src_port = src_port;
4168                         sctphdr->dest_port = dest_port;
4169                         sctphdr->v_tag = v_tag;
4170                         sctphdr->checksum = 0;
4171
4172                         /*
4173                          * If source address selection fails and we find no
4174                          * route then the ip_output should fail as well with
4175                          * a NO_ROUTE_TO_HOST type error. We probably should
4176                          * catch that somewhere and abort the association
4177                          * right away (assuming this is an INIT being sent).
4178                          */
4179                         if (ro->ro_nh == NULL) {
4180                                 /*
4181                                  * src addr selection failed to find a route
4182                                  * (or valid source addr), so we can't get
4183                                  * there from here (yet)!
4184                                  */
4185                                 sctp_handle_no_route(stcb, net, so_locked);
4186                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4187                                 sctp_m_freem(m);
4188                                 return (EHOSTUNREACH);
4189                         }
4190                         if (ro != &iproute) {
4191                                 memcpy(&iproute, ro, sizeof(*ro));
4192                         }
4193                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4194                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4195                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4196                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4197                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4198                             (void *)ro->ro_nh);
4199
4200                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4201                                 /* failed to prepend data, give up */
4202                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4203                                 sctp_m_freem(m);
4204                                 return (ENOMEM);
4205                         }
4206                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4207                         if (port) {
4208                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4209                                 SCTP_STAT_INCR(sctps_sendswcrc);
4210                                 if (V_udp_cksum) {
4211                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4212                                 }
4213                         } else {
4214                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4215                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4216                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4217                         }
4218 #ifdef SCTP_PACKET_LOGGING
4219                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4220                                 sctp_packet_log(o_pak);
4221 #endif
4222                         /* send it out.  table id is taken from stcb */
4223                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4224                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4225                         if (port) {
4226                                 UDPSTAT_INC(udps_opackets);
4227                         }
4228                         SCTP_STAT_INCR(sctps_sendpackets);
4229                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4230                         if (ret)
4231                                 SCTP_STAT_INCR(sctps_senderrors);
4232
4233                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4234                         if (net == NULL) {
4235                                 /* free tempy routes */
4236                                 RO_NHFREE(ro);
4237                         } else {
4238                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4239                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4240                                         uint32_t mtu;
4241
4242                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4243                                         if (mtu > 0) {
4244                                                 if (net->port) {
4245                                                         mtu -= sizeof(struct udphdr);
4246                                                 }
4247                                                 if (mtu < net->mtu) {
4248                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4249                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4250                                                         }
4251                                                         net->mtu = mtu;
4252                                                 }
4253                                         }
4254                                 } else if (ro->ro_nh == NULL) {
4255                                         /* route was freed */
4256                                         if (net->ro._s_addr &&
4257                                             net->src_addr_selected) {
4258                                                 sctp_free_ifa(net->ro._s_addr);
4259                                                 net->ro._s_addr = NULL;
4260                                         }
4261                                         net->src_addr_selected = 0;
4262                                 }
4263                         }
4264                         return (ret);
4265                 }
4266 #endif
4267 #ifdef INET6
4268         case AF_INET6:
4269                 {
4270                         uint32_t flowlabel, flowinfo;
4271                         struct ip6_hdr *ip6h;
4272                         struct route_in6 ip6route;
4273                         struct ifnet *ifp;
4274                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4275                         int prev_scope = 0;
4276                         struct sockaddr_in6 lsa6_storage;
4277                         int error;
4278                         u_short prev_port = 0;
4279                         int len;
4280
4281                         if (net) {
4282                                 flowlabel = net->flowlabel;
4283                         } else if (stcb) {
4284                                 flowlabel = stcb->asoc.default_flowlabel;
4285                         } else {
4286                                 flowlabel = inp->sctp_ep.default_flowlabel;
4287                         }
4288                         if (flowlabel == 0) {
4289                                 /*
4290                                  * This means especially, that it is not set
4291                                  * at the SCTP layer. So use the value from
4292                                  * the IP layer.
4293                                  */
4294                                 flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
4295                         }
4296                         flowlabel &= 0x000fffff;
4297                         len = SCTP_MIN_OVERHEAD;
4298                         if (port) {
4299                                 len += sizeof(struct udphdr);
4300                         }
4301                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4302                         if (newm == NULL) {
4303                                 sctp_m_freem(m);
4304                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4305                                 return (ENOMEM);
4306                         }
4307                         SCTP_ALIGN_TO_END(newm, len);
4308                         SCTP_BUF_LEN(newm) = len;
4309                         SCTP_BUF_NEXT(newm) = m;
4310                         m = newm;
4311                         if (net != NULL) {
4312                                 m->m_pkthdr.flowid = net->flowid;
4313                                 M_HASHTYPE_SET(m, net->flowtype);
4314                         } else {
4315                                 m->m_pkthdr.flowid = mflowid;
4316                                 M_HASHTYPE_SET(m, mflowtype);
4317                         }
4318                         packet_length = sctp_calculate_len(m);
4319
4320                         ip6h = mtod(m, struct ip6_hdr *);
4321                         /* protect *sin6 from overwrite */
4322                         sin6 = (struct sockaddr_in6 *)to;
4323                         tmp = *sin6;
4324                         sin6 = &tmp;
4325
4326                         /* KAME hack: embed scopeid */
4327                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4328                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4329                                 sctp_m_freem(m);
4330                                 return (EINVAL);
4331                         }
4332                         if (net == NULL) {
4333                                 memset(&ip6route, 0, sizeof(ip6route));
4334                                 ro = (sctp_route_t *)&ip6route;
4335                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4336                         } else {
4337                                 ro = (sctp_route_t *)&net->ro;
4338                         }
4339                         /*
4340                          * We assume here that inp_flow is in host byte
4341                          * order within the TCB!
4342                          */
4343                         if (tos_value == 0) {
4344                                 /*
4345                                  * This means especially, that it is not set
4346                                  * at the SCTP layer. So use the value from
4347                                  * the IP layer.
4348                                  */
4349                                 tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
4350                         }
4351                         tos_value &= 0xfc;
4352                         if (ecn_ok) {
4353                                 tos_value |= sctp_get_ect(stcb);
4354                         }
4355                         flowinfo = 0x06;
4356                         flowinfo <<= 8;
4357                         flowinfo |= tos_value;
4358                         flowinfo <<= 20;
4359                         flowinfo |= flowlabel;
4360                         ip6h->ip6_flow = htonl(flowinfo);
4361                         if (port) {
4362                                 ip6h->ip6_nxt = IPPROTO_UDP;
4363                         } else {
4364                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4365                         }
4366                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4367                         ip6h->ip6_dst = sin6->sin6_addr;
4368
4369                         /*
4370                          * Add SRC address selection here: we can only reuse
4371                          * to a limited degree the kame src-addr-sel, since
4372                          * we can try their selection but it may not be
4373                          * bound.
4374                          */
4375                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4376                         lsa6_tmp.sin6_family = AF_INET6;
4377                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4378                         lsa6 = &lsa6_tmp;
4379                         if (net && out_of_asoc_ok == 0) {
4380                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4381                                         sctp_free_ifa(net->ro._s_addr);
4382                                         net->ro._s_addr = NULL;
4383                                         net->src_addr_selected = 0;
4384                                         RO_NHFREE(ro);
4385                                 }
4386                                 if (net->src_addr_selected == 0) {
4387                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4388                                         /* KAME hack: embed scopeid */
4389                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4390                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4391                                                 sctp_m_freem(m);
4392                                                 return (EINVAL);
4393                                         }
4394                                         /* Cache the source address */
4395                                         net->ro._s_addr = sctp_source_address_selection(inp,
4396                                             stcb,
4397                                             ro,
4398                                             net,
4399                                             0,
4400                                             vrf_id);
4401                                         (void)sa6_recoverscope(sin6);
4402                                         net->src_addr_selected = 1;
4403                                 }
4404                                 if (net->ro._s_addr == NULL) {
4405                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4406                                         net->src_addr_selected = 0;
4407                                         sctp_handle_no_route(stcb, net, so_locked);
4408                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4409                                         sctp_m_freem(m);
4410                                         return (EHOSTUNREACH);
4411                                 }
4412                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4413                         } else {
4414                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4415                                 /* KAME hack: embed scopeid */
4416                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4417                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4418                                         sctp_m_freem(m);
4419                                         return (EINVAL);
4420                                 }
4421                                 if (over_addr == NULL) {
4422                                         struct sctp_ifa *_lsrc;
4423
4424                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4425                                             net,
4426                                             out_of_asoc_ok,
4427                                             vrf_id);
4428                                         if (_lsrc == NULL) {
4429                                                 sctp_handle_no_route(stcb, net, so_locked);
4430                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4431                                                 sctp_m_freem(m);
4432                                                 return (EHOSTUNREACH);
4433                                         }
4434                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4435                                         sctp_free_ifa(_lsrc);
4436                                 } else {
4437                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4438                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4439                                 }
4440                                 (void)sa6_recoverscope(sin6);
4441                         }
4442                         lsa6->sin6_port = inp->sctp_lport;
4443
4444                         if (ro->ro_nh == NULL) {
4445                                 /*
4446                                  * src addr selection failed to find a route
4447                                  * (or valid source addr), so we can't get
4448                                  * there from here!
4449                                  */
4450                                 sctp_handle_no_route(stcb, net, so_locked);
4451                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4452                                 sctp_m_freem(m);
4453                                 return (EHOSTUNREACH);
4454                         }
4455                         /*
4456                          * XXX: sa6 may not have a valid sin6_scope_id in
4457                          * the non-SCOPEDROUTING case.
4458                          */
4459                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4460                         lsa6_storage.sin6_family = AF_INET6;
4461                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4462                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4463                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4464                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4465                                 sctp_m_freem(m);
4466                                 return (error);
4467                         }
4468                         /* XXX */
4469                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4470                         lsa6_storage.sin6_port = inp->sctp_lport;
4471                         lsa6 = &lsa6_storage;
4472                         ip6h->ip6_src = lsa6->sin6_addr;
4473
4474                         if (port) {
4475                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4476                                         sctp_handle_no_route(stcb, net, so_locked);
4477                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4478                                         sctp_m_freem(m);
4479                                         return (EHOSTUNREACH);
4480                                 }
4481                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4482                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4483                                 udp->uh_dport = port;
4484                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4485                                 udp->uh_sum = 0;
4486                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4487                         } else {
4488                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4489                         }
4490
4491                         sctphdr->src_port = src_port;
4492                         sctphdr->dest_port = dest_port;
4493                         sctphdr->v_tag = v_tag;
4494                         sctphdr->checksum = 0;
4495
4496                         /*
4497                          * We set the hop limit now since there is a good
4498                          * chance that our ro pointer is now filled
4499                          */
4500                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4501                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4502
4503 #ifdef SCTP_DEBUG
4504                         /* Copy to be sure something bad is not happening */
4505                         sin6->sin6_addr = ip6h->ip6_dst;
4506                         lsa6->sin6_addr = ip6h->ip6_src;
4507 #endif
4508
4509                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4510                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4511                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4512                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4513                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4514                         if (net) {
4515                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4516                                 /*
4517                                  * preserve the port and scope for link
4518                                  * local send
4519                                  */
4520                                 prev_scope = sin6->sin6_scope_id;
4521                                 prev_port = sin6->sin6_port;
4522                         }
4523
4524                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4525                                 /* failed to prepend data, give up */
4526                                 sctp_m_freem(m);
4527                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4528                                 return (ENOMEM);
4529                         }
4530                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4531                         if (port) {
4532                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4533                                 SCTP_STAT_INCR(sctps_sendswcrc);
4534                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4535                                         udp->uh_sum = 0xffff;
4536                                 }
4537                         } else {
4538                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4539                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4540                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4541                         }
4542                         /* send it out. table id is taken from stcb */
4543 #ifdef SCTP_PACKET_LOGGING
4544                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4545                                 sctp_packet_log(o_pak);
4546 #endif
4547                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4548                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4549                         if (net) {
4550                                 /* for link local this must be done */
4551                                 sin6->sin6_scope_id = prev_scope;
4552                                 sin6->sin6_port = prev_port;
4553                         }
4554                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4555                         if (port) {
4556                                 UDPSTAT_INC(udps_opackets);
4557                         }
4558                         SCTP_STAT_INCR(sctps_sendpackets);
4559                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4560                         if (ret) {
4561                                 SCTP_STAT_INCR(sctps_senderrors);
4562                         }
4563                         if (net == NULL) {
4564                                 /* Now if we had a temp route free it */
4565                                 RO_NHFREE(ro);
4566                         } else {
4567                                 /*
4568                                  * PMTU check versus smallest asoc MTU goes
4569                                  * here
4570                                  */
4571                                 if (ro->ro_nh == NULL) {
4572                                         /* Route was freed */
4573                                         if (net->ro._s_addr &&
4574                                             net->src_addr_selected) {
4575                                                 sctp_free_ifa(net->ro._s_addr);
4576                                                 net->ro._s_addr = NULL;
4577                                         }
4578                                         net->src_addr_selected = 0;
4579                                 }
4580                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
4581                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4582                                         uint32_t mtu;
4583
4584                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
4585                                         if (mtu > 0) {
4586                                                 if (net->port) {
4587                                                         mtu -= sizeof(struct udphdr);
4588                                                 }
4589                                                 if (mtu < net->mtu) {
4590                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4591                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4592                                                         }
4593                                                         net->mtu = mtu;
4594                                                 }
4595                                         }
4596                                 } else if (ifp) {
4597                                         if (ND_IFINFO(ifp)->linkmtu &&
4598                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4599                                                 sctp_mtu_size_reset(inp,
4600                                                     &stcb->asoc,
4601                                                     ND_IFINFO(ifp)->linkmtu);
4602                                         }
4603                                 }
4604                         }
4605                         return (ret);
4606                 }
4607 #endif
4608         default:
4609                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4610                     ((struct sockaddr *)to)->sa_family);
4611                 sctp_m_freem(m);
4612                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4613                 return (EFAULT);
4614         }
4615 }
4616
4617 void
4618 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
4619 {
4620         struct mbuf *m, *m_last;
4621         struct sctp_nets *net;
4622         struct sctp_init_chunk *init;
4623         struct sctp_supported_addr_param *sup_addr;
4624         struct sctp_adaptation_layer_indication *ali;
4625         struct sctp_supported_chunk_types_param *pr_supported;
4626         struct sctp_paramhdr *ph;
4627         int cnt_inits_to = 0;
4628         int error;
4629         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4630
4631         /* INIT's always go to the primary (and usually ONLY address) */
4632         net = stcb->asoc.primary_destination;
4633         if (net == NULL) {
4634                 net = TAILQ_FIRST(&stcb->asoc.nets);
4635                 if (net == NULL) {
4636                         /* TSNH */
4637                         return;
4638                 }
4639                 /* we confirm any address we send an INIT to */
4640                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4641                 (void)sctp_set_primary_addr(stcb, NULL, net);
4642         } else {
4643                 /* we confirm any address we send an INIT to */
4644                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4645         }
4646         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4647 #ifdef INET6
4648         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4649                 /*
4650                  * special hook, if we are sending to link local it will not
4651                  * show up in our private address count.
4652                  */
4653                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4654                         cnt_inits_to = 1;
4655         }
4656 #endif
4657         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4658                 /* This case should not happen */
4659                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4660                 return;
4661         }
4662         /* start the INIT timer */
4663         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4664
4665         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4666         if (m == NULL) {
4667                 /* No memory, INIT timer will re-attempt. */
4668                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4669                 return;
4670         }
4671         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4672         padding_len = 0;
4673         /* Now lets put the chunk header in place */
4674         init = mtod(m, struct sctp_init_chunk *);
4675         /* now the chunk header */
4676         init->ch.chunk_type = SCTP_INITIATION;
4677         init->ch.chunk_flags = 0;
4678         /* fill in later from mbuf we build */
4679         init->ch.chunk_length = 0;
4680         /* place in my tag */
4681         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4682         /* set up some of the credits. */
4683         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4684             SCTP_MINIMAL_RWND));
4685         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4686         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4687         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4688
4689         /* Adaptation layer indication parameter */
4690         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4691                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4692                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4693                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4694                 ali->ph.param_length = htons(parameter_len);
4695                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4696                 chunk_len += parameter_len;
4697         }
4698
4699         /* ECN parameter */
4700         if (stcb->asoc.ecn_supported == 1) {
4701                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4702                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4703                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4704                 ph->param_length = htons(parameter_len);
4705                 chunk_len += parameter_len;
4706         }
4707
4708         /* PR-SCTP supported parameter */
4709         if (stcb->asoc.prsctp_supported == 1) {
4710                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4711                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4712                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4713                 ph->param_length = htons(parameter_len);
4714                 chunk_len += parameter_len;
4715         }
4716
4717         /* Add NAT friendly parameter. */
4718         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4719                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4720                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4721                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4722                 ph->param_length = htons(parameter_len);
4723                 chunk_len += parameter_len;
4724         }
4725
4726         /* And now tell the peer which extensions we support */
4727         num_ext = 0;
4728         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4729         if (stcb->asoc.prsctp_supported == 1) {
4730                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4731                 if (stcb->asoc.idata_supported) {
4732                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4733                 }
4734         }
4735         if (stcb->asoc.auth_supported == 1) {
4736                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4737         }
4738         if (stcb->asoc.asconf_supported == 1) {
4739                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4740                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4741         }
4742         if (stcb->asoc.reconfig_supported == 1) {
4743                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4744         }
4745         if (stcb->asoc.idata_supported) {
4746                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4747         }
4748         if (stcb->asoc.nrsack_supported == 1) {
4749                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4750         }
4751         if (stcb->asoc.pktdrop_supported == 1) {
4752                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4753         }
4754         if (num_ext > 0) {
4755                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4756                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4757                 pr_supported->ph.param_length = htons(parameter_len);
4758                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4759                 chunk_len += parameter_len;
4760         }
4761         /* add authentication parameters */
4762         if (stcb->asoc.auth_supported) {
4763                 /* attach RANDOM parameter, if available */
4764                 if (stcb->asoc.authinfo.random != NULL) {
4765                         struct sctp_auth_random *randp;
4766
4767                         if (padding_len > 0) {
4768                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4769                                 chunk_len += padding_len;
4770                                 padding_len = 0;
4771                         }
4772                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4773                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4774                         /* random key already contains the header */
4775                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4776                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4777                         chunk_len += parameter_len;
4778                 }
4779                 /* add HMAC_ALGO parameter */
4780                 if (stcb->asoc.local_hmacs != NULL) {
4781                         struct sctp_auth_hmac_algo *hmacs;
4782
4783                         if (padding_len > 0) {
4784                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4785                                 chunk_len += padding_len;
4786                                 padding_len = 0;
4787                         }
4788                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4789                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4790                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4791                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4792                         hmacs->ph.param_length = htons(parameter_len);
4793                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4794                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4795                         chunk_len += parameter_len;
4796                 }
4797                 /* add CHUNKS parameter */
4798                 if (stcb->asoc.local_auth_chunks != NULL) {
4799                         struct sctp_auth_chunk_list *chunks;
4800
4801                         if (padding_len > 0) {
4802                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4803                                 chunk_len += padding_len;
4804                                 padding_len = 0;
4805                         }
4806                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4807                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4808                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4809                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4810                         chunks->ph.param_length = htons(parameter_len);
4811                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4812                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4813                         chunk_len += parameter_len;
4814                 }
4815         }
4816
4817         /* now any cookie time extensions */
4818         if (stcb->asoc.cookie_preserve_req) {
4819                 struct sctp_cookie_perserve_param *cookie_preserve;
4820
4821                 if (padding_len > 0) {
4822                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4823                         chunk_len += padding_len;
4824                         padding_len = 0;
4825                 }
4826                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4827                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4828                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4829                 cookie_preserve->ph.param_length = htons(parameter_len);
4830                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4831                 stcb->asoc.cookie_preserve_req = 0;
4832                 chunk_len += parameter_len;
4833         }
4834
4835         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4836                 uint8_t i;
4837
4838                 if (padding_len > 0) {
4839                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4840                         chunk_len += padding_len;
4841                         padding_len = 0;
4842                 }
4843                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4844                 if (stcb->asoc.scope.ipv4_addr_legal) {
4845                         parameter_len += (uint16_t)sizeof(uint16_t);
4846                 }
4847                 if (stcb->asoc.scope.ipv6_addr_legal) {
4848                         parameter_len += (uint16_t)sizeof(uint16_t);
4849                 }
4850                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4851                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4852                 sup_addr->ph.param_length = htons(parameter_len);
4853                 i = 0;
4854                 if (stcb->asoc.scope.ipv4_addr_legal) {
4855                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4856                 }
4857                 if (stcb->asoc.scope.ipv6_addr_legal) {
4858                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4859                 }
4860                 padding_len = 4 - 2 * i;
4861                 chunk_len += parameter_len;
4862         }
4863
4864         SCTP_BUF_LEN(m) = chunk_len;
4865         /* now the addresses */
4866         /*
4867          * To optimize this we could put the scoping stuff into a structure
4868          * and remove the individual uint8's from the assoc structure. Then
4869          * we could just sifa in the address within the stcb. But for now
4870          * this is a quick hack to get the address stuff teased apart.
4871          */
4872         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4873             m, cnt_inits_to,
4874             &padding_len, &chunk_len);
4875
4876         init->ch.chunk_length = htons(chunk_len);
4877         if (padding_len > 0) {
4878                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4879                         sctp_m_freem(m);
4880                         return;
4881                 }
4882         }
4883         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4884         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4885             (struct sockaddr *)&net->ro._l_addr,
4886             m, 0, NULL, 0, 0, 0, 0,
4887             inp->sctp_lport, stcb->rport, htonl(0),
4888             net->port, NULL,
4889             0, 0,
4890             so_locked))) {
4891                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4892                 if (error == ENOBUFS) {
4893                         stcb->asoc.ifp_had_enobuf = 1;
4894                         SCTP_STAT_INCR(sctps_lowlevelerr);
4895                 }
4896         } else {
4897                 stcb->asoc.ifp_had_enobuf = 0;
4898         }
4899         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4900         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4901 }
4902
4903 struct mbuf *
4904 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4905     int param_offset, int *abort_processing,
4906     struct sctp_chunkhdr *cp,
4907     int *nat_friendly,
4908     int *cookie_found)
4909 {
4910         /*
4911          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4912          * being equal to the beginning of the params i.e. (iphlen +
4913          * sizeof(struct sctp_init_msg) parse through the parameters to the
4914          * end of the mbuf verifying that all parameters are known.
4915          *
4916          * For unknown parameters build and return a mbuf with
4917          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4918          * processing this chunk stop, and set *abort_processing to 1.
4919          *
4920          * By having param_offset be pre-set to where parameters begin it is
4921          * hoped that this routine may be reused in the future by new
4922          * features.
4923          */
4924         struct sctp_paramhdr *phdr, params;
4925
4926         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4927         int at, limit, pad_needed;
4928         uint16_t ptype, plen, padded_size;
4929
4930         *abort_processing = 0;
4931         if (cookie_found != NULL) {
4932                 *cookie_found = 0;
4933         }
4934         mat = in_initpkt;
4935         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4936         at = param_offset;
4937         op_err = NULL;
4938         op_err_last = NULL;
4939         pad_needed = 0;
4940         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4941         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4942         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4943                 ptype = ntohs(phdr->param_type);
4944                 plen = ntohs(phdr->param_length);
4945                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4946                         /* wacked parameter */
4947                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4948                         goto invalid_size;
4949                 }
4950                 limit -= SCTP_SIZE32(plen);
4951                 /*-
4952                  * All parameters for all chunks that we know/understand are
4953                  * listed here. We process them other places and make
4954                  * appropriate stop actions per the upper bits. However this
4955                  * is the generic routine processor's can call to get back
4956                  * an operr.. to either incorporate (init-ack) or send.
4957                  */
4958                 padded_size = SCTP_SIZE32(plen);
4959                 switch (ptype) {
4960                         /* Param's with variable size */
4961                 case SCTP_HEARTBEAT_INFO:
4962                 case SCTP_UNRECOG_PARAM:
4963                 case SCTP_ERROR_CAUSE_IND:
4964                         /* ok skip fwd */
4965                         at += padded_size;
4966                         break;
4967                 case SCTP_STATE_COOKIE:
4968                         if (cookie_found != NULL) {
4969                                 *cookie_found = 1;
4970                         }
4971                         at += padded_size;
4972                         break;
4973                         /* Param's with variable size within a range */
4974                 case SCTP_CHUNK_LIST:
4975                 case SCTP_SUPPORTED_CHUNK_EXT:
4976                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4977                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4978                                 goto invalid_size;
4979                         }
4980                         at += padded_size;
4981                         break;
4982                 case SCTP_SUPPORTED_ADDRTYPE:
4983                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4984                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4985                                 goto invalid_size;
4986                         }
4987                         at += padded_size;
4988                         break;
4989                 case SCTP_RANDOM:
4990                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4991                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4992                                 goto invalid_size;
4993                         }
4994                         at += padded_size;
4995                         break;
4996                 case SCTP_SET_PRIM_ADDR:
4997                 case SCTP_DEL_IP_ADDRESS:
4998                 case SCTP_ADD_IP_ADDRESS:
4999                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5000                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5001                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5002                                 goto invalid_size;
5003                         }
5004                         at += padded_size;
5005                         break;
5006                         /* Param's with a fixed size */
5007                 case SCTP_IPV4_ADDRESS:
5008                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5009                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5010                                 goto invalid_size;
5011                         }
5012                         at += padded_size;
5013                         break;
5014                 case SCTP_IPV6_ADDRESS:
5015                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5016                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5017                                 goto invalid_size;
5018                         }
5019                         at += padded_size;
5020                         break;
5021                 case SCTP_COOKIE_PRESERVE:
5022                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5023                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5024                                 goto invalid_size;
5025                         }
5026                         at += padded_size;
5027                         break;
5028                 case SCTP_HAS_NAT_SUPPORT:
5029                         *nat_friendly = 1;
5030                         /* fall through */
5031                 case SCTP_PRSCTP_SUPPORTED:
5032                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5033                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5034                                 goto invalid_size;
5035                         }
5036                         at += padded_size;
5037                         break;
5038                 case SCTP_ECN_CAPABLE:
5039                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5040                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5041                                 goto invalid_size;
5042                         }
5043                         at += padded_size;
5044                         break;
5045                 case SCTP_ULP_ADAPTATION:
5046                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5047                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5048                                 goto invalid_size;
5049                         }
5050                         at += padded_size;
5051                         break;
5052                 case SCTP_SUCCESS_REPORT:
5053                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5054                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5055                                 goto invalid_size;
5056                         }
5057                         at += padded_size;
5058                         break;
5059                 case SCTP_HOSTNAME_ADDRESS:
5060                         {
5061                                 /* Hostname parameters are deprecated. */
5062                                 struct sctp_gen_error_cause *cause;
5063                                 int l_len;
5064
5065                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5066                                 *abort_processing = 1;
5067                                 sctp_m_freem(op_err);
5068                                 op_err = NULL;
5069                                 op_err_last = NULL;
5070 #ifdef INET6
5071                                 l_len = SCTP_MIN_OVERHEAD;
5072 #else
5073                                 l_len = SCTP_MIN_V4_OVERHEAD;
5074 #endif
5075                                 l_len += sizeof(struct sctp_chunkhdr);
5076                                 l_len += sizeof(struct sctp_gen_error_cause);
5077                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5078                                 if (op_err != NULL) {
5079                                         /*
5080                                          * Pre-reserve space for IP, SCTP,
5081                                          * and chunk header.
5082                                          */
5083 #ifdef INET6
5084                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5085 #else
5086                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5087 #endif
5088                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5089                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5090                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5091                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5092                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5093                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5094                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5095                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5096                                                 sctp_m_freem(op_err);
5097                                                 op_err = NULL;
5098                                                 op_err_last = NULL;
5099                                         }
5100                                 }
5101                                 return (op_err);
5102                         }
5103                 default:
5104                         /*
5105                          * we do not recognize the parameter figure out what
5106                          * we do.
5107                          */
5108                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5109                         if ((ptype & 0x4000) == 0x4000) {
5110                                 /* Report bit is set?? */
5111                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5112                                 if (op_err == NULL) {
5113                                         int l_len;
5114
5115                                         /* Ok need to try to get an mbuf */
5116 #ifdef INET6
5117                                         l_len = SCTP_MIN_OVERHEAD;
5118 #else
5119                                         l_len = SCTP_MIN_V4_OVERHEAD;
5120 #endif
5121                                         l_len += sizeof(struct sctp_chunkhdr);
5122                                         l_len += sizeof(struct sctp_paramhdr);
5123                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5124                                         if (op_err) {
5125                                                 SCTP_BUF_LEN(op_err) = 0;
5126 #ifdef INET6
5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5128 #else
5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5130 #endif
5131                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5132                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5133                                                 op_err_last = op_err;
5134                                         }
5135                                 }
5136                                 if (op_err != NULL) {
5137                                         /* If we have space */
5138                                         struct sctp_paramhdr *param;
5139
5140                                         if (pad_needed > 0) {
5141                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5142                                         }
5143                                         if (op_err_last == NULL) {
5144                                                 sctp_m_freem(op_err);
5145                                                 op_err = NULL;
5146                                                 op_err_last = NULL;
5147                                                 goto more_processing;
5148                                         }
5149                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5150                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5151                                                 if (m_tmp == NULL) {
5152                                                         sctp_m_freem(op_err);
5153                                                         op_err = NULL;
5154                                                         op_err_last = NULL;
5155                                                         goto more_processing;
5156                                                 }
5157                                                 SCTP_BUF_LEN(m_tmp) = 0;
5158                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5159                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5160                                                 op_err_last = m_tmp;
5161                                         }
5162                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5163                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5164                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5165                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5166                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5167                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5168                                                 sctp_m_freem(op_err);
5169                                                 op_err = NULL;
5170                                                 op_err_last = NULL;
5171                                                 goto more_processing;
5172                                         } else {
5173                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5174                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5175                                                 }
5176                                         }
5177                                         if (plen % 4 != 0) {
5178                                                 pad_needed = 4 - (plen % 4);
5179                                         } else {
5180                                                 pad_needed = 0;
5181                                         }
5182                                 }
5183                         }
5184         more_processing:
5185                         if ((ptype & 0x8000) == 0x0000) {
5186                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5187                                 return (op_err);
5188                         } else {
5189                                 /* skip this chunk and continue processing */
5190                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5191                                 at += SCTP_SIZE32(plen);
5192                         }
5193                         break;
5194                 }
5195                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5196         }
5197         return (op_err);
5198 invalid_size:
5199         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5200         *abort_processing = 1;
5201         sctp_m_freem(op_err);
5202         op_err = NULL;
5203         op_err_last = NULL;
5204         if (phdr != NULL) {
5205                 struct sctp_paramhdr *param;
5206                 int l_len;
5207 #ifdef INET6
5208                 l_len = SCTP_MIN_OVERHEAD;
5209 #else
5210                 l_len = SCTP_MIN_V4_OVERHEAD;
5211 #endif
5212                 l_len += sizeof(struct sctp_chunkhdr);
5213                 l_len += (2 * sizeof(struct sctp_paramhdr));
5214                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5215                 if (op_err) {
5216                         SCTP_BUF_LEN(op_err) = 0;
5217 #ifdef INET6
5218                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5219 #else
5220                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5221 #endif
5222                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5223                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5224                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5225                         param = mtod(op_err, struct sctp_paramhdr *);
5226                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5227                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5228                         param++;
5229                         param->param_type = htons(ptype);
5230                         param->param_length = htons(plen);
5231                 }
5232         }
5233         return (op_err);
5234 }
5235
5236 static int
5237 sctp_are_there_new_addresses(struct sctp_association *asoc,
5238     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5239 {
5240         /*
5241          * Given a INIT packet, look through the packet to verify that there
5242          * are NO new addresses. As we go through the parameters add reports
5243          * of any un-understood parameters that require an error.  Also we
5244          * must return (1) to drop the packet if we see a un-understood
5245          * parameter that tells us to drop the chunk.
5246          */
5247         struct sockaddr *sa_touse;
5248         struct sockaddr *sa;
5249         struct sctp_paramhdr *phdr, params;
5250         uint16_t ptype, plen;
5251         uint8_t fnd;
5252         struct sctp_nets *net;
5253         int check_src;
5254 #ifdef INET
5255         struct sockaddr_in sin4, *sa4;
5256 #endif
5257 #ifdef INET6
5258         struct sockaddr_in6 sin6, *sa6;
5259 #endif
5260
5261 #ifdef INET
5262         memset(&sin4, 0, sizeof(sin4));
5263         sin4.sin_family = AF_INET;
5264         sin4.sin_len = sizeof(sin4);
5265 #endif
5266 #ifdef INET6
5267         memset(&sin6, 0, sizeof(sin6));
5268         sin6.sin6_family = AF_INET6;
5269         sin6.sin6_len = sizeof(sin6);
5270 #endif
5271         /* First what about the src address of the pkt ? */
5272         check_src = 0;
5273         switch (src->sa_family) {
5274 #ifdef INET
5275         case AF_INET:
5276                 if (asoc->scope.ipv4_addr_legal) {
5277                         check_src = 1;
5278                 }
5279                 break;
5280 #endif
5281 #ifdef INET6
5282         case AF_INET6:
5283                 if (asoc->scope.ipv6_addr_legal) {
5284                         check_src = 1;
5285                 }
5286                 break;
5287 #endif
5288         default:
5289                 /* TSNH */
5290                 break;
5291         }
5292         if (check_src) {
5293                 fnd = 0;
5294                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5295                         sa = (struct sockaddr *)&net->ro._l_addr;
5296                         if (sa->sa_family == src->sa_family) {
5297 #ifdef INET
5298                                 if (sa->sa_family == AF_INET) {
5299                                         struct sockaddr_in *src4;
5300
5301                                         sa4 = (struct sockaddr_in *)sa;
5302                                         src4 = (struct sockaddr_in *)src;
5303                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5304                                                 fnd = 1;
5305                                                 break;
5306                                         }
5307                                 }
5308 #endif
5309 #ifdef INET6
5310                                 if (sa->sa_family == AF_INET6) {
5311                                         struct sockaddr_in6 *src6;
5312
5313                                         sa6 = (struct sockaddr_in6 *)sa;
5314                                         src6 = (struct sockaddr_in6 *)src;
5315                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5316                                                 fnd = 1;
5317                                                 break;
5318                                         }
5319                                 }
5320 #endif
5321                         }
5322                 }
5323                 if (fnd == 0) {
5324                         /* New address added! no need to look further. */
5325                         return (1);
5326                 }
5327         }
5328         /* Ok so far lets munge through the rest of the packet */
5329         offset += sizeof(struct sctp_init_chunk);
5330         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5331         while (phdr) {
5332                 sa_touse = NULL;
5333                 ptype = ntohs(phdr->param_type);
5334                 plen = ntohs(phdr->param_length);
5335                 switch (ptype) {
5336 #ifdef INET
5337                 case SCTP_IPV4_ADDRESS:
5338                         {
5339                                 struct sctp_ipv4addr_param *p4, p4_buf;
5340
5341                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5342                                         return (1);
5343                                 }
5344                                 phdr = sctp_get_next_param(in_initpkt, offset,
5345                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5346                                 if (phdr == NULL) {
5347                                         return (1);
5348                                 }
5349                                 if (asoc->scope.ipv4_addr_legal) {
5350                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5351                                         sin4.sin_addr.s_addr = p4->addr;
5352                                         sa_touse = (struct sockaddr *)&sin4;
5353                                 }
5354                                 break;
5355                         }
5356 #endif
5357 #ifdef INET6
5358                 case SCTP_IPV6_ADDRESS:
5359                         {
5360                                 struct sctp_ipv6addr_param *p6, p6_buf;
5361
5362                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5363                                         return (1);
5364                                 }
5365                                 phdr = sctp_get_next_param(in_initpkt, offset,
5366                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5367                                 if (phdr == NULL) {
5368                                         return (1);
5369                                 }
5370                                 if (asoc->scope.ipv6_addr_legal) {
5371                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5372                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5373                                             sizeof(p6->addr));
5374                                         sa_touse = (struct sockaddr *)&sin6;
5375                                 }
5376                                 break;
5377                         }
5378 #endif
5379                 default:
5380                         sa_touse = NULL;
5381                         break;
5382                 }
5383                 if (sa_touse) {
5384                         /* ok, sa_touse points to one to check */
5385                         fnd = 0;
5386                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5387                                 sa = (struct sockaddr *)&net->ro._l_addr;
5388                                 if (sa->sa_family != sa_touse->sa_family) {
5389                                         continue;
5390                                 }
5391 #ifdef INET
5392                                 if (sa->sa_family == AF_INET) {
5393                                         sa4 = (struct sockaddr_in *)sa;
5394                                         if (sa4->sin_addr.s_addr ==
5395                                             sin4.sin_addr.s_addr) {
5396                                                 fnd = 1;
5397                                                 break;
5398                                         }
5399                                 }
5400 #endif
5401 #ifdef INET6
5402                                 if (sa->sa_family == AF_INET6) {
5403                                         sa6 = (struct sockaddr_in6 *)sa;
5404                                         if (SCTP6_ARE_ADDR_EQUAL(
5405                                             sa6, &sin6)) {
5406                                                 fnd = 1;
5407                                                 break;
5408                                         }
5409                                 }
5410 #endif
5411                         }
5412                         if (!fnd) {
5413                                 /* New addr added! no need to look further */
5414                                 return (1);
5415                         }
5416                 }
5417                 offset += SCTP_SIZE32(plen);
5418                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5419         }
5420         return (0);
5421 }
5422
5423 /*
5424  * Given a MBUF chain that was sent into us containing an INIT. Build a
5425  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5426  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5427  * message (i.e. the struct sctp_init_msg).
5428  */
5429 void
5430 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5431     struct sctp_nets *src_net, struct mbuf *init_pkt,
5432     int iphlen, int offset,
5433     struct sockaddr *src, struct sockaddr *dst,
5434     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5435     uint8_t mflowtype, uint32_t mflowid,
5436     uint32_t vrf_id, uint16_t port)
5437 {
5438         struct sctp_association *asoc;
5439         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5440         struct sctp_init_ack_chunk *initack;
5441         struct sctp_adaptation_layer_indication *ali;
5442         struct sctp_supported_chunk_types_param *pr_supported;
5443         struct sctp_paramhdr *ph;
5444         union sctp_sockstore *over_addr;
5445         struct sctp_scoping scp;
5446         struct timeval now;
5447 #ifdef INET
5448         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5449         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5450         struct sockaddr_in *sin;
5451 #endif
5452 #ifdef INET6
5453         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5454         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5455         struct sockaddr_in6 *sin6;
5456 #endif
5457         struct sockaddr *to;
5458         struct sctp_state_cookie stc;
5459         struct sctp_nets *net = NULL;
5460         uint8_t *signature = NULL;
5461         int cnt_inits_to = 0;
5462         uint16_t his_limit, i_want;
5463         int abort_flag;
5464         int nat_friendly = 0;
5465         int error;
5466         struct socket *so;
5467         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5468
5469         if (stcb) {
5470                 asoc = &stcb->asoc;
5471         } else {
5472                 asoc = NULL;
5473         }
5474         if ((asoc != NULL) &&
5475             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5476                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5477                         /*
5478                          * new addresses, out of here in non-cookie-wait
5479                          * states
5480                          *
5481                          * Send an ABORT, without the new address error
5482                          * cause. This looks no different than if no
5483                          * listener was present.
5484                          */
5485                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5486                             "Address added");
5487                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5488                             mflowtype, mflowid, inp->fibnum,
5489                             vrf_id, port);
5490                         return;
5491                 }
5492                 if (src_net != NULL && (src_net->port != port)) {
5493                         /*
5494                          * change of remote encapsulation port, out of here
5495                          * in non-cookie-wait states
5496                          *
5497                          * Send an ABORT, without an specific error cause.
5498                          * This looks no different than if no listener was
5499                          * present.
5500                          */
5501                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5502                             "Remote encapsulation port changed");
5503                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5504                             mflowtype, mflowid, inp->fibnum,
5505                             vrf_id, port);
5506                         return;
5507                 }
5508         }
5509         abort_flag = 0;
5510         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5511             (offset + sizeof(struct sctp_init_chunk)),
5512             &abort_flag,
5513             (struct sctp_chunkhdr *)init_chk,
5514             &nat_friendly, NULL);
5515         if (abort_flag) {
5516 do_a_abort:
5517                 if (op_err == NULL) {
5518                         char msg[SCTP_DIAG_INFO_LEN];
5519
5520                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5521                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5522                             msg);
5523                 }
5524                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5525                     init_chk->init.initiate_tag, op_err,
5526                     mflowtype, mflowid, inp->fibnum,
5527                     vrf_id, port);
5528                 return;
5529         }
5530         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5531         if (m == NULL) {
5532                 /* No memory, INIT timer will re-attempt. */
5533                 sctp_m_freem(op_err);
5534                 return;
5535         }
5536         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5537         padding_len = 0;
5538
5539         /*
5540          * We might not overwrite the identification[] completely and on
5541          * some platforms time_entered will contain some padding. Therefore
5542          * zero out the cookie to avoid putting uninitialized memory on the
5543          * wire.
5544          */
5545         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5546
5547         /* the time I built cookie */
5548         (void)SCTP_GETTIME_TIMEVAL(&now);
5549         stc.time_entered.tv_sec = now.tv_sec;
5550         stc.time_entered.tv_usec = now.tv_usec;
5551
5552         /* populate any tie tags */
5553         if (asoc != NULL) {
5554                 /* unlock before tag selections */
5555                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5556                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5557                 stc.cookie_life = asoc->cookie_life;
5558                 net = asoc->primary_destination;
5559         } else {
5560                 stc.tie_tag_my_vtag = 0;
5561                 stc.tie_tag_peer_vtag = 0;
5562                 /* life I will award this cookie */
5563                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5564         }
5565
5566         /* copy in the ports for later check */
5567         stc.myport = sh->dest_port;
5568         stc.peerport = sh->src_port;
5569
5570         /*
5571          * If we wanted to honor cookie life extensions, we would add to
5572          * stc.cookie_life. For now we should NOT honor any extension
5573          */
5574         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5575         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5576                 stc.ipv6_addr_legal = 1;
5577                 if (SCTP_IPV6_V6ONLY(inp)) {
5578                         stc.ipv4_addr_legal = 0;
5579                 } else {
5580                         stc.ipv4_addr_legal = 1;
5581                 }
5582         } else {
5583                 stc.ipv6_addr_legal = 0;
5584                 stc.ipv4_addr_legal = 1;
5585         }
5586         stc.ipv4_scope = 0;
5587         if (net == NULL) {
5588                 to = src;
5589                 switch (dst->sa_family) {
5590 #ifdef INET
5591                 case AF_INET:
5592                         {
5593                                 /* lookup address */
5594                                 stc.address[0] = src4->sin_addr.s_addr;
5595                                 stc.address[1] = 0;
5596                                 stc.address[2] = 0;
5597                                 stc.address[3] = 0;
5598                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5599                                 /* local from address */
5600                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5601                                 stc.laddress[1] = 0;
5602                                 stc.laddress[2] = 0;
5603                                 stc.laddress[3] = 0;
5604                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5605                                 /* scope_id is only for v6 */
5606                                 stc.scope_id = 0;
5607                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5608                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5609                                         stc.ipv4_scope = 1;
5610                                 }
5611                                 /* Must use the address in this case */
5612                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5613                                         stc.loopback_scope = 1;
5614                                         stc.ipv4_scope = 1;
5615                                         stc.site_scope = 1;
5616                                         stc.local_scope = 0;
5617                                 }
5618                                 break;
5619                         }
5620 #endif
5621 #ifdef INET6
5622                 case AF_INET6:
5623                         {
5624                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5625                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5626                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5627                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5628                                         stc.loopback_scope = 1;
5629                                         stc.local_scope = 0;
5630                                         stc.site_scope = 1;
5631                                         stc.ipv4_scope = 1;
5632                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5633                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5634                                         /*
5635                                          * If the new destination or source
5636                                          * is a LINK_LOCAL we must have
5637                                          * common both site and local scope.
5638                                          * Don't set local scope though
5639                                          * since we must depend on the
5640                                          * source to be added implicitly. We
5641                                          * cannot assure just because we
5642                                          * share one link that all links are
5643                                          * common.
5644                                          */
5645                                         stc.local_scope = 0;
5646                                         stc.site_scope = 1;
5647                                         stc.ipv4_scope = 1;
5648                                         /*
5649                                          * we start counting for the private
5650                                          * address stuff at 1. since the
5651                                          * link local we source from won't
5652                                          * show up in our scoped count.
5653                                          */
5654                                         cnt_inits_to = 1;
5655                                         /*
5656                                          * pull out the scope_id from
5657                                          * incoming pkt
5658                                          */
5659                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5660                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5661                                         /*
5662                                          * If the new destination or source
5663                                          * is SITE_LOCAL then we must have
5664                                          * site scope in common.
5665                                          */
5666                                         stc.site_scope = 1;
5667                                 }
5668                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5669                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5670                                 break;
5671                         }
5672 #endif
5673                 default:
5674                         /* TSNH */
5675                         goto do_a_abort;
5676                         break;
5677                 }
5678         } else {
5679                 /* set the scope per the existing tcb */
5680
5681 #ifdef INET6
5682                 struct sctp_nets *lnet;
5683 #endif
5684
5685                 stc.loopback_scope = asoc->scope.loopback_scope;
5686                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5687                 stc.site_scope = asoc->scope.site_scope;
5688                 stc.local_scope = asoc->scope.local_scope;
5689 #ifdef INET6
5690                 /* Why do we not consider IPv4 LL addresses? */
5691                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5692                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5693                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5694                                         /*
5695                                          * if we have a LL address, start
5696                                          * counting at 1.
5697                                          */
5698                                         cnt_inits_to = 1;
5699                                 }
5700                         }
5701                 }
5702 #endif
5703                 /* use the net pointer */
5704                 to = (struct sockaddr *)&net->ro._l_addr;
5705                 switch (to->sa_family) {
5706 #ifdef INET
5707                 case AF_INET:
5708                         sin = (struct sockaddr_in *)to;
5709                         stc.address[0] = sin->sin_addr.s_addr;
5710                         stc.address[1] = 0;
5711                         stc.address[2] = 0;
5712                         stc.address[3] = 0;
5713                         stc.addr_type = SCTP_IPV4_ADDRESS;
5714                         if (net->src_addr_selected == 0) {
5715                                 /*
5716                                  * strange case here, the INIT should have
5717                                  * did the selection.
5718                                  */
5719                                 net->ro._s_addr = sctp_source_address_selection(inp,
5720                                     stcb, (sctp_route_t *)&net->ro,
5721                                     net, 0, vrf_id);
5722                                 if (net->ro._s_addr == NULL) {
5723                                         sctp_m_freem(op_err);
5724                                         sctp_m_freem(m);
5725                                         return;
5726                                 }
5727
5728                                 net->src_addr_selected = 1;
5729                         }
5730                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5731                         stc.laddress[1] = 0;
5732                         stc.laddress[2] = 0;
5733                         stc.laddress[3] = 0;
5734                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5735                         /* scope_id is only for v6 */
5736                         stc.scope_id = 0;
5737                         break;
5738 #endif
5739 #ifdef INET6
5740                 case AF_INET6:
5741                         sin6 = (struct sockaddr_in6 *)to;
5742                         memcpy(&stc.address, &sin6->sin6_addr,
5743                             sizeof(struct in6_addr));
5744                         stc.addr_type = SCTP_IPV6_ADDRESS;
5745                         stc.scope_id = sin6->sin6_scope_id;
5746                         if (net->src_addr_selected == 0) {
5747                                 /*
5748                                  * strange case here, the INIT should have
5749                                  * done the selection.
5750                                  */
5751                                 net->ro._s_addr = sctp_source_address_selection(inp,
5752                                     stcb, (sctp_route_t *)&net->ro,
5753                                     net, 0, vrf_id);
5754                                 if (net->ro._s_addr == NULL) {
5755                                         sctp_m_freem(op_err);
5756                                         sctp_m_freem(m);
5757                                         return;
5758                                 }
5759
5760                                 net->src_addr_selected = 1;
5761                         }
5762                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5763                             sizeof(struct in6_addr));
5764                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5765                         break;
5766 #endif
5767                 }
5768         }
5769         /* Now lets put the SCTP header in place */
5770         initack = mtod(m, struct sctp_init_ack_chunk *);
5771         /* Save it off for quick ref */
5772         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5773         /* who are we */
5774         memcpy(stc.identification, SCTP_VERSION_STRING,
5775             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5776         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5777         /* now the chunk header */
5778         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5779         initack->ch.chunk_flags = 0;
5780         /* fill in later from mbuf we build */
5781         initack->ch.chunk_length = 0;
5782         /* place in my tag */
5783         if ((asoc != NULL) &&
5784             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5785             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5786             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5787                 /* re-use the v-tags and init-seq here */
5788                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5789                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5790         } else {
5791                 uint32_t vtag, itsn;
5792
5793                 if (asoc) {
5794                         atomic_add_int(&asoc->refcnt, 1);
5795                         SCTP_TCB_UNLOCK(stcb);
5796         new_tag:
5797                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5798                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5799                                 /*
5800                                  * Got a duplicate vtag on some guy behind a
5801                                  * nat make sure we don't use it.
5802                                  */
5803                                 goto new_tag;
5804                         }
5805                         initack->init.initiate_tag = htonl(vtag);
5806                         /* get a TSN to use too */
5807                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5808                         initack->init.initial_tsn = htonl(itsn);
5809                         SCTP_TCB_LOCK(stcb);
5810                         atomic_add_int(&asoc->refcnt, -1);
5811                 } else {
5812                         SCTP_INP_INCR_REF(inp);
5813                         SCTP_INP_RUNLOCK(inp);
5814                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5815                         initack->init.initiate_tag = htonl(vtag);
5816                         /* get a TSN to use too */
5817                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5818                         SCTP_INP_RLOCK(inp);
5819                         SCTP_INP_DECR_REF(inp);
5820                 }
5821         }
5822         /* save away my tag to */
5823         stc.my_vtag = initack->init.initiate_tag;
5824
5825         /* set up some of the credits. */
5826         so = inp->sctp_socket;
5827         if (so == NULL) {
5828                 /* memory problem */
5829                 sctp_m_freem(op_err);
5830                 sctp_m_freem(m);
5831                 return;
5832         } else {
5833                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5834         }
5835         /* set what I want */
5836         his_limit = ntohs(init_chk->init.num_inbound_streams);
5837         /* choose what I want */
5838         if (asoc != NULL) {
5839                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5840                         i_want = asoc->streamoutcnt;
5841                 } else {
5842                         i_want = asoc->pre_open_streams;
5843                 }
5844         } else {
5845                 i_want = inp->sctp_ep.pre_open_stream_count;
5846         }
5847         if (his_limit < i_want) {
5848                 /* I Want more :< */
5849                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5850         } else {
5851                 /* I can have what I want :> */
5852                 initack->init.num_outbound_streams = htons(i_want);
5853         }
5854         /* tell him his limit. */
5855         initack->init.num_inbound_streams =
5856             htons(inp->sctp_ep.max_open_streams_intome);
5857
5858         /* adaptation layer indication parameter */
5859         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5860                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5861                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5862                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5863                 ali->ph.param_length = htons(parameter_len);
5864                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5865                 chunk_len += parameter_len;
5866         }
5867
5868         /* ECN parameter */
5869         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5870             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5871                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5872                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5873                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5874                 ph->param_length = htons(parameter_len);
5875                 chunk_len += parameter_len;
5876         }
5877
5878         /* PR-SCTP supported parameter */
5879         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5880             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5881                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5882                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5883                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5884                 ph->param_length = htons(parameter_len);
5885                 chunk_len += parameter_len;
5886         }
5887
5888         /* Add NAT friendly parameter */
5889         if (nat_friendly) {
5890                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5891                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5892                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5893                 ph->param_length = htons(parameter_len);
5894                 chunk_len += parameter_len;
5895         }
5896
5897         /* And now tell the peer which extensions we support */
5898         num_ext = 0;
5899         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5900         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5901             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5902                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5903                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5904                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5905                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5906                 }
5907         }
5908         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5909             ((asoc == NULL) && (inp->auth_supported == 1))) {
5910                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5911         }
5912         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5913             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5914                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5915                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5916         }
5917         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5918             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5919                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5920         }
5921         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5922             ((asoc == NULL) && (inp->idata_supported == 1))) {
5923                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5924         }
5925         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5926             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5927                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5928         }
5929         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5930             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5931                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5932         }
5933         if (num_ext > 0) {
5934                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5935                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5936                 pr_supported->ph.param_length = htons(parameter_len);
5937                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5938                 chunk_len += parameter_len;
5939         }
5940
5941         /* add authentication parameters */
5942         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5943             ((asoc == NULL) && (inp->auth_supported == 1))) {
5944                 struct sctp_auth_random *randp;
5945                 struct sctp_auth_hmac_algo *hmacs;
5946                 struct sctp_auth_chunk_list *chunks;
5947
5948                 if (padding_len > 0) {
5949                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5950                         chunk_len += padding_len;
5951                         padding_len = 0;
5952                 }
5953                 /* generate and add RANDOM parameter */
5954                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5955                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5956                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5957                 randp->ph.param_type = htons(SCTP_RANDOM);
5958                 randp->ph.param_length = htons(parameter_len);
5959                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5960                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5961                 chunk_len += parameter_len;
5962
5963                 if (padding_len > 0) {
5964                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5965                         chunk_len += padding_len;
5966                         padding_len = 0;
5967                 }
5968                 /* add HMAC_ALGO parameter */
5969                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5970                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
5971                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5972                     (uint8_t *)hmacs->hmac_ids);
5973                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5974                 hmacs->ph.param_length = htons(parameter_len);
5975                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5976                 chunk_len += parameter_len;
5977
5978                 if (padding_len > 0) {
5979                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5980                         chunk_len += padding_len;
5981                         padding_len = 0;
5982                 }
5983                 /* add CHUNKS parameter */
5984                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
5985                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
5986                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5987                     chunks->chunk_types);
5988                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5989                 chunks->ph.param_length = htons(parameter_len);
5990                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5991                 chunk_len += parameter_len;
5992         }
5993         SCTP_BUF_LEN(m) = chunk_len;
5994         m_last = m;
5995         /* now the addresses */
5996         /*
5997          * To optimize this we could put the scoping stuff into a structure
5998          * and remove the individual uint8's from the stc structure. Then we
5999          * could just sifa in the address within the stc.. but for now this
6000          * is a quick hack to get the address stuff teased apart.
6001          */
6002         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6003         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6004         scp.loopback_scope = stc.loopback_scope;
6005         scp.ipv4_local_scope = stc.ipv4_scope;
6006         scp.local_scope = stc.local_scope;
6007         scp.site_scope = stc.site_scope;
6008         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6009             cnt_inits_to,
6010             &padding_len, &chunk_len);
6011         /* padding_len can only be positive, if no addresses have been added */
6012         if (padding_len > 0) {
6013                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6014                 chunk_len += padding_len;
6015                 SCTP_BUF_LEN(m) += padding_len;
6016                 padding_len = 0;
6017         }
6018
6019         /* tack on the operational error if present */
6020         if (op_err) {
6021                 parameter_len = 0;
6022                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6023                         parameter_len += SCTP_BUF_LEN(m_tmp);
6024                 }
6025                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6026                 SCTP_BUF_NEXT(m_last) = op_err;
6027                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6028                         m_last = SCTP_BUF_NEXT(m_last);
6029                 }
6030                 chunk_len += parameter_len;
6031         }
6032         if (padding_len > 0) {
6033                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6034                 if (m_last == NULL) {
6035                         /* Houston we have a problem, no space */
6036                         sctp_m_freem(m);
6037                         return;
6038                 }
6039                 chunk_len += padding_len;
6040                 padding_len = 0;
6041         }
6042         /* Now we must build a cookie */
6043         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6044         if (m_cookie == NULL) {
6045                 /* memory problem */
6046                 sctp_m_freem(m);
6047                 return;
6048         }
6049         /* Now append the cookie to the end and update the space/size */
6050         SCTP_BUF_NEXT(m_last) = m_cookie;
6051         parameter_len = 0;
6052         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6053                 parameter_len += SCTP_BUF_LEN(m_tmp);
6054                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6055                         m_last = m_tmp;
6056                 }
6057         }
6058         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6059         chunk_len += parameter_len;
6060
6061         /*
6062          * Place in the size, but we don't include the last pad (if any) in
6063          * the INIT-ACK.
6064          */
6065         initack->ch.chunk_length = htons(chunk_len);
6066
6067         /*
6068          * Time to sign the cookie, we don't sign over the cookie signature
6069          * though thus we set trailer.
6070          */
6071         (void)sctp_hmac_m(SCTP_HMAC,
6072             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6073             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6074             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6075         /*
6076          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6077          * here since the timer will drive a retranmission.
6078          */
6079         if (padding_len > 0) {
6080                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6081                         sctp_m_freem(m);
6082                         return;
6083                 }
6084         }
6085         if (stc.loopback_scope) {
6086                 over_addr = (union sctp_sockstore *)dst;
6087         } else {
6088                 over_addr = NULL;
6089         }
6090
6091         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6092             0, 0,
6093             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6094             port, over_addr,
6095             mflowtype, mflowid,
6096             SCTP_SO_NOT_LOCKED))) {
6097                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6098                 if (error == ENOBUFS) {
6099                         if (asoc != NULL) {
6100                                 asoc->ifp_had_enobuf = 1;
6101                         }
6102                         SCTP_STAT_INCR(sctps_lowlevelerr);
6103                 }
6104         } else {
6105                 if (asoc != NULL) {
6106                         asoc->ifp_had_enobuf = 0;
6107                 }
6108         }
6109         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6110 }
6111
6112 static void
6113 sctp_prune_prsctp(struct sctp_tcb *stcb,
6114     struct sctp_association *asoc,
6115     struct sctp_sndrcvinfo *srcv,
6116     int dataout)
6117 {
6118         int freed_spc = 0;
6119         struct sctp_tmit_chunk *chk, *nchk;
6120
6121         SCTP_TCB_LOCK_ASSERT(stcb);
6122         if ((asoc->prsctp_supported) &&
6123             (asoc->sent_queue_cnt_removeable > 0)) {
6124                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6125                         /*
6126                          * Look for chunks marked with the PR_SCTP flag AND
6127                          * the buffer space flag. If the one being sent is
6128                          * equal or greater priority then purge the old one
6129                          * and free some space.
6130                          */
6131                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6132                                 /*
6133                                  * This one is PR-SCTP AND buffer space
6134                                  * limited type
6135                                  */
6136                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6137                                         /*
6138                                          * Lower numbers equates to higher
6139                                          * priority. So if the one we are
6140                                          * looking at has a larger priority,
6141                                          * we want to drop the data and NOT
6142                                          * retransmit it.
6143                                          */
6144                                         if (chk->data) {
6145                                                 /*
6146                                                  * We release the book_size
6147                                                  * if the mbuf is here
6148                                                  */
6149                                                 int ret_spc;
6150                                                 uint8_t sent;
6151
6152                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6153                                                         sent = 1;
6154                                                 else
6155                                                         sent = 0;
6156                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6157                                                     sent,
6158                                                     SCTP_SO_LOCKED);
6159                                                 freed_spc += ret_spc;
6160                                                 if (freed_spc >= dataout) {
6161                                                         return;
6162                                                 }
6163                                         }       /* if chunk was present */
6164                                 }       /* if of sufficient priority */
6165                         }       /* if chunk has enabled */
6166                 }               /* tailqforeach */
6167
6168                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6169                         /* Here we must move to the sent queue and mark */
6170                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6171                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
6172                                         if (chk->data) {
6173                                                 /*
6174                                                  * We release the book_size
6175                                                  * if the mbuf is here
6176                                                  */
6177                                                 int ret_spc;
6178
6179                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6180                                                     0, SCTP_SO_LOCKED);
6181
6182                                                 freed_spc += ret_spc;
6183                                                 if (freed_spc >= dataout) {
6184                                                         return;
6185                                                 }
6186                                         }       /* end if chk->data */
6187                                 }       /* end if right class */
6188                         }       /* end if chk pr-sctp */
6189                 }               /* tailqforeachsafe (chk) */
6190         }                       /* if enabled in asoc */
6191 }
6192
6193 int
6194 sctp_get_frag_point(struct sctp_tcb *stcb,
6195     struct sctp_association *asoc)
6196 {
6197         int siz, ovh;
6198
6199         /*
6200          * For endpoints that have both v6 and v4 addresses we must reserve
6201          * room for the ipv6 header, for those that are only dealing with V4
6202          * we use a larger frag point.
6203          */
6204         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6205                 ovh = SCTP_MIN_OVERHEAD;
6206         } else {
6207                 ovh = SCTP_MIN_V4_OVERHEAD;
6208         }
6209         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6210         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6211                 siz = asoc->smallest_mtu - ovh;
6212         else
6213                 siz = (stcb->asoc.sctp_frag_point - ovh);
6214         /*
6215          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6216          */
6217         /* A data chunk MUST fit in a cluster */
6218         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6219         /* } */
6220
6221         /* adjust for an AUTH chunk if DATA requires auth */
6222         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6223                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6224
6225         if (siz % 4) {
6226                 /* make it an even word boundary please */
6227                 siz -= (siz % 4);
6228         }
6229         return (siz);
6230 }
6231
6232 static void
6233 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6234 {
6235         /*
6236          * We assume that the user wants PR_SCTP_TTL if the user provides a
6237          * positive lifetime but does not specify any PR_SCTP policy.
6238          */
6239         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6240                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6241         } else if (sp->timetolive > 0) {
6242                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6243                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6244         } else {
6245                 return;
6246         }
6247         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6248         case CHUNK_FLAGS_PR_SCTP_BUF:
6249                 /*
6250                  * Time to live is a priority stored in tv_sec when doing
6251                  * the buffer drop thing.
6252                  */
6253                 sp->ts.tv_sec = sp->timetolive;
6254                 sp->ts.tv_usec = 0;
6255                 break;
6256         case CHUNK_FLAGS_PR_SCTP_TTL:
6257                 {
6258                         struct timeval tv;
6259
6260                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6261                         tv.tv_sec = sp->timetolive / 1000;
6262                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6263                         /*
6264                          * TODO sctp_constants.h needs alternative time
6265                          * macros when _KERNEL is undefined.
6266                          */
6267                         timevaladd(&sp->ts, &tv);
6268                 }
6269                 break;
6270         case CHUNK_FLAGS_PR_SCTP_RTX:
6271                 /*
6272                  * Time to live is a the number or retransmissions stored in
6273                  * tv_sec.
6274                  */
6275                 sp->ts.tv_sec = sp->timetolive;
6276                 sp->ts.tv_usec = 0;
6277                 break;
6278         default:
6279                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6280                     "Unknown PR_SCTP policy %u.\n",
6281                     PR_SCTP_POLICY(sp->sinfo_flags));
6282                 break;
6283         }
6284 }
6285
6286 static int
6287 sctp_msg_append(struct sctp_tcb *stcb,
6288     struct sctp_nets *net,
6289     struct mbuf *m,
6290     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6291 {
6292         int error = 0;
6293         struct mbuf *at;
6294         struct sctp_stream_queue_pending *sp = NULL;
6295         struct sctp_stream_out *strm;
6296
6297         /*
6298          * Given an mbuf chain, put it into the association send queue and
6299          * place it on the wheel
6300          */
6301         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6302                 /* Invalid stream number */
6303                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6304                 error = EINVAL;
6305                 goto out_now;
6306         }
6307         if ((stcb->asoc.stream_locked) &&
6308             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6309                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6310                 error = EINVAL;
6311                 goto out_now;
6312         }
6313         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6314         /* Now can we send this? */
6315         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6316             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6317             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6318             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6319                 /* got data while shutting down */
6320                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6321                 error = ECONNRESET;
6322                 goto out_now;
6323         }
6324         sctp_alloc_a_strmoq(stcb, sp);
6325         if (sp == NULL) {
6326                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6327                 error = ENOMEM;
6328                 goto out_now;
6329         }
6330         sp->sinfo_flags = srcv->sinfo_flags;
6331         sp->timetolive = srcv->sinfo_timetolive;
6332         sp->ppid = srcv->sinfo_ppid;
6333         sp->context = srcv->sinfo_context;
6334         sp->fsn = 0;
6335         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6336                 sp->net = net;
6337                 atomic_add_int(&sp->net->ref_count, 1);
6338         } else {
6339                 sp->net = NULL;
6340         }
6341         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6342         sp->sid = srcv->sinfo_stream;
6343         sp->msg_is_complete = 1;
6344         sp->sender_all_done = 1;
6345         sp->some_taken = 0;
6346         sp->data = m;
6347         sp->tail_mbuf = NULL;
6348         sctp_set_prsctp_policy(sp);
6349         /*
6350          * We could in theory (for sendall) sifa the length in, but we would
6351          * still have to hunt through the chain since we need to setup the
6352          * tail_mbuf
6353          */
6354         sp->length = 0;
6355         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6356                 if (SCTP_BUF_NEXT(at) == NULL)
6357                         sp->tail_mbuf = at;
6358                 sp->length += SCTP_BUF_LEN(at);
6359         }
6360         if (srcv->sinfo_keynumber_valid) {
6361                 sp->auth_keyid = srcv->sinfo_keynumber;
6362         } else {
6363                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6364         }
6365         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6366                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6367                 sp->holds_key_ref = 1;
6368         }
6369         if (hold_stcb_lock == 0) {
6370                 SCTP_TCB_SEND_LOCK(stcb);
6371         }
6372         sctp_snd_sb_alloc(stcb, sp->length);
6373         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6374         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6375         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6376         m = NULL;
6377         if (hold_stcb_lock == 0) {
6378                 SCTP_TCB_SEND_UNLOCK(stcb);
6379         }
6380 out_now:
6381         if (m) {
6382                 sctp_m_freem(m);
6383         }
6384         return (error);
6385 }
6386
6387 static struct mbuf *
6388 sctp_copy_mbufchain(struct mbuf *clonechain,
6389     struct mbuf *outchain,
6390     struct mbuf **endofchain,
6391     int can_take_mbuf,
6392     int sizeofcpy,
6393     uint8_t copy_by_ref)
6394 {
6395         struct mbuf *m;
6396         struct mbuf *appendchain;
6397         caddr_t cp;
6398         int len;
6399
6400         if (endofchain == NULL) {
6401                 /* error */
6402 error_out:
6403                 if (outchain)
6404                         sctp_m_freem(outchain);
6405                 return (NULL);
6406         }
6407         if (can_take_mbuf) {
6408                 appendchain = clonechain;
6409         } else {
6410                 if (!copy_by_ref &&
6411                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
6412                         /* Its not in a cluster */
6413                         if (*endofchain == NULL) {
6414                                 /* lets get a mbuf cluster */
6415                                 if (outchain == NULL) {
6416                                         /* This is the general case */
6417                         new_mbuf:
6418                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6419                                         if (outchain == NULL) {
6420                                                 goto error_out;
6421                                         }
6422                                         SCTP_BUF_LEN(outchain) = 0;
6423                                         *endofchain = outchain;
6424                                         /* get the prepend space */
6425                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6426                                 } else {
6427                                         /*
6428                                          * We really should not get a NULL
6429                                          * in endofchain
6430                                          */
6431                                         /* find end */
6432                                         m = outchain;
6433                                         while (m) {
6434                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6435                                                         *endofchain = m;
6436                                                         break;
6437                                                 }
6438                                                 m = SCTP_BUF_NEXT(m);
6439                                         }
6440                                         /* sanity */
6441                                         if (*endofchain == NULL) {
6442                                                 /*
6443                                                  * huh, TSNH XXX maybe we
6444                                                  * should panic
6445                                                  */
6446                                                 sctp_m_freem(outchain);
6447                                                 goto new_mbuf;
6448                                         }
6449                                 }
6450                                 /* get the new end of length */
6451                                 len = (int)M_TRAILINGSPACE(*endofchain);
6452                         } else {
6453                                 /* how much is left at the end? */
6454                                 len = (int)M_TRAILINGSPACE(*endofchain);
6455                         }
6456                         /* Find the end of the data, for appending */
6457                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6458
6459                         /* Now lets copy it out */
6460                         if (len >= sizeofcpy) {
6461                                 /* It all fits, copy it in */
6462                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6463                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6464                         } else {
6465                                 /* fill up the end of the chain */
6466                                 if (len > 0) {
6467                                         m_copydata(clonechain, 0, len, cp);
6468                                         SCTP_BUF_LEN((*endofchain)) += len;
6469                                         /* now we need another one */
6470                                         sizeofcpy -= len;
6471                                 }
6472                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6473                                 if (m == NULL) {
6474                                         /* We failed */
6475                                         goto error_out;
6476                                 }
6477                                 SCTP_BUF_NEXT((*endofchain)) = m;
6478                                 *endofchain = m;
6479                                 cp = mtod((*endofchain), caddr_t);
6480                                 m_copydata(clonechain, len, sizeofcpy, cp);
6481                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6482                         }
6483                         return (outchain);
6484                 } else {
6485                         /* copy the old fashion way */
6486                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6487 #ifdef SCTP_MBUF_LOGGING
6488                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6489                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6490                         }
6491 #endif
6492                 }
6493         }
6494         if (appendchain == NULL) {
6495                 /* error */
6496                 if (outchain)
6497                         sctp_m_freem(outchain);
6498                 return (NULL);
6499         }
6500         if (outchain) {
6501                 /* tack on to the end */
6502                 if (*endofchain != NULL) {
6503                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6504                 } else {
6505                         m = outchain;
6506                         while (m) {
6507                                 if (SCTP_BUF_NEXT(m) == NULL) {
6508                                         SCTP_BUF_NEXT(m) = appendchain;
6509                                         break;
6510                                 }
6511                                 m = SCTP_BUF_NEXT(m);
6512                         }
6513                 }
6514                 /*
6515                  * save off the end and update the end-chain position
6516                  */
6517                 m = appendchain;
6518                 while (m) {
6519                         if (SCTP_BUF_NEXT(m) == NULL) {
6520                                 *endofchain = m;
6521                                 break;
6522                         }
6523                         m = SCTP_BUF_NEXT(m);
6524                 }
6525                 return (outchain);
6526         } else {
6527                 /* save off the end and update the end-chain position */
6528                 m = appendchain;
6529                 while (m) {
6530                         if (SCTP_BUF_NEXT(m) == NULL) {
6531                                 *endofchain = m;
6532                                 break;
6533                         }
6534                         m = SCTP_BUF_NEXT(m);
6535                 }
6536                 return (appendchain);
6537         }
6538 }
6539
6540 static int
6541 sctp_med_chunk_output(struct sctp_inpcb *inp,
6542     struct sctp_tcb *stcb,
6543     struct sctp_association *asoc,
6544     int *num_out,
6545     int *reason_code,
6546     int control_only, int from_where,
6547     struct timeval *now, int *now_filled, int frag_point, int so_locked);
6548
6549 static void
6550 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6551     uint32_t val SCTP_UNUSED)
6552 {
6553         struct sctp_copy_all *ca;
6554         struct mbuf *m;
6555         int ret = 0;
6556         int added_control = 0;
6557         int un_sent, do_chunk_output = 1;
6558         struct sctp_association *asoc;
6559         struct sctp_nets *net;
6560
6561         ca = (struct sctp_copy_all *)ptr;
6562         if (ca->m == NULL) {
6563                 return;
6564         }
6565         if (ca->inp != inp) {
6566                 /* TSNH */
6567                 return;
6568         }
6569         if (ca->sndlen > 0) {
6570                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6571                 if (m == NULL) {
6572                         /* can't copy so we are done */
6573                         ca->cnt_failed++;
6574                         return;
6575                 }
6576 #ifdef SCTP_MBUF_LOGGING
6577                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6578                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6579                 }
6580 #endif
6581         } else {
6582                 m = NULL;
6583         }
6584         SCTP_TCB_LOCK_ASSERT(stcb);
6585         if (stcb->asoc.alternate) {
6586                 net = stcb->asoc.alternate;
6587         } else {
6588                 net = stcb->asoc.primary_destination;
6589         }
6590         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6591                 /* Abort this assoc with m as the user defined reason */
6592                 if (m != NULL) {
6593                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6594                 } else {
6595                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6596                             0, M_NOWAIT, 1, MT_DATA);
6597                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6598                 }
6599                 if (m != NULL) {
6600                         struct sctp_paramhdr *ph;
6601
6602                         ph = mtod(m, struct sctp_paramhdr *);
6603                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6604                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6605                 }
6606                 /*
6607                  * We add one here to keep the assoc from dis-appearing on
6608                  * us.
6609                  */
6610                 atomic_add_int(&stcb->asoc.refcnt, 1);
6611                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6612                 /*
6613                  * sctp_abort_an_association calls sctp_free_asoc() free
6614                  * association will NOT free it since we incremented the
6615                  * refcnt .. we do this to prevent it being freed and things
6616                  * getting tricky since we could end up (from free_asoc)
6617                  * calling inpcb_free which would get a recursive lock call
6618                  * to the iterator lock.. But as a consequence of that the
6619                  * stcb will return to us un-locked.. since free_asoc
6620                  * returns with either no TCB or the TCB unlocked, we must
6621                  * relock.. to unlock in the iterator timer :-0
6622                  */
6623                 SCTP_TCB_LOCK(stcb);
6624                 atomic_add_int(&stcb->asoc.refcnt, -1);
6625                 goto no_chunk_output;
6626         } else {
6627                 if (m) {
6628                         ret = sctp_msg_append(stcb, net, m,
6629                             &ca->sndrcv, 1);
6630                 }
6631                 asoc = &stcb->asoc;
6632                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6633                         /* shutdown this assoc */
6634                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6635                             TAILQ_EMPTY(&asoc->sent_queue) &&
6636                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6637                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6638                                         goto abort_anyway;
6639                                 }
6640                                 /*
6641                                  * there is nothing queued to send, so I'm
6642                                  * done...
6643                                  */
6644                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6645                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6646                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6647                                         /*
6648                                          * only send SHUTDOWN the first time
6649                                          * through
6650                                          */
6651                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6652                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6653                                         }
6654                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6655                                         sctp_stop_timers_for_shutdown(stcb);
6656                                         sctp_send_shutdown(stcb, net);
6657                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6658                                             net);
6659                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6660                                             NULL);
6661                                         added_control = 1;
6662                                         do_chunk_output = 0;
6663                                 }
6664                         } else {
6665                                 /*
6666                                  * we still got (or just got) data to send,
6667                                  * so set SHUTDOWN_PENDING
6668                                  */
6669                                 /*
6670                                  * XXX sockets draft says that SCTP_EOF
6671                                  * should be sent with no data.  currently,
6672                                  * we will allow user data to be sent first
6673                                  * and move to SHUTDOWN-PENDING
6674                                  */
6675                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6676                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6677                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6678                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6679                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6680                                         }
6681                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6682                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6683                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6684                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6685                                                 struct mbuf *op_err;
6686                                                 char msg[SCTP_DIAG_INFO_LEN];
6687
6688                                 abort_anyway:
6689                                                 SCTP_SNPRINTF(msg, sizeof(msg),
6690                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6691                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6692                                                     msg);
6693                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6694                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6695                                                     op_err, SCTP_SO_NOT_LOCKED);
6696                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6697                                                 goto no_chunk_output;
6698                                         }
6699                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6700                                             NULL);
6701                                 }
6702                         }
6703                 }
6704         }
6705         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6706             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6707
6708         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6709             (stcb->asoc.total_flight > 0) &&
6710             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6711                 do_chunk_output = 0;
6712         }
6713         if (do_chunk_output)
6714                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6715         else if (added_control) {
6716                 int num_out, reason, now_filled = 0;
6717                 struct timeval now;
6718                 int frag_point;
6719
6720                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6721                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6722                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6723         }
6724 no_chunk_output:
6725         if (ret) {
6726                 ca->cnt_failed++;
6727         } else {
6728                 ca->cnt_sent++;
6729         }
6730 }
6731
6732 static void
6733 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6734 {
6735         struct sctp_copy_all *ca;
6736
6737         ca = (struct sctp_copy_all *)ptr;
6738         /*
6739          * Do a notify here? Kacheong suggests that the notify be done at
6740          * the send time.. so you would push up a notification if any send
6741          * failed. Don't know if this is feasible since the only failures we
6742          * have is "memory" related and if you cannot get an mbuf to send
6743          * the data you surely can't get an mbuf to send up to notify the
6744          * user you can't send the data :->
6745          */
6746
6747         /* now free everything */
6748         if (ca->inp) {
6749                 /* Lets clear the flag to allow others to run. */
6750                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6751         }
6752         sctp_m_freem(ca->m);
6753         SCTP_FREE(ca, SCTP_M_COPYAL);
6754 }
6755
6756 static struct mbuf *
6757 sctp_copy_out_all(struct uio *uio, ssize_t len)
6758 {
6759         struct mbuf *ret, *at;
6760         ssize_t left, willcpy, cancpy, error;
6761
6762         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6763         if (ret == NULL) {
6764                 /* TSNH */
6765                 return (NULL);
6766         }
6767         left = len;
6768         SCTP_BUF_LEN(ret) = 0;
6769         /* save space for the data chunk header */
6770         cancpy = (int)M_TRAILINGSPACE(ret);
6771         willcpy = min(cancpy, left);
6772         at = ret;
6773         while (left > 0) {
6774                 /* Align data to the end */
6775                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6776                 if (error) {
6777         err_out_now:
6778                         sctp_m_freem(at);
6779                         return (NULL);
6780                 }
6781                 SCTP_BUF_LEN(at) = (int)willcpy;
6782                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6783                 left -= willcpy;
6784                 if (left > 0) {
6785                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6786                         if (SCTP_BUF_NEXT(at) == NULL) {
6787                                 goto err_out_now;
6788                         }
6789                         at = SCTP_BUF_NEXT(at);
6790                         SCTP_BUF_LEN(at) = 0;
6791                         cancpy = (int)M_TRAILINGSPACE(at);
6792                         willcpy = min(cancpy, left);
6793                 }
6794         }
6795         return (ret);
6796 }
6797
6798 static int
6799 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6800     struct sctp_sndrcvinfo *srcv)
6801 {
6802         int ret;
6803         struct sctp_copy_all *ca;
6804
6805         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6806                 /* There is another. */
6807                 return (EBUSY);
6808         }
6809         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
6810                 /* You must not be larger than the limit! */
6811                 return (EMSGSIZE);
6812         }
6813         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6814             SCTP_M_COPYAL);
6815         if (ca == NULL) {
6816                 sctp_m_freem(m);
6817                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6818                 return (ENOMEM);
6819         }
6820         memset(ca, 0, sizeof(struct sctp_copy_all));
6821
6822         ca->inp = inp;
6823         if (srcv) {
6824                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6825         }
6826         /*
6827          * take off the sendall flag, it would be bad if we failed to do
6828          * this :-0
6829          */
6830         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6831         /* get length and mbuf chain */
6832         if (uio) {
6833                 ca->sndlen = uio->uio_resid;
6834                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6835                 if (ca->m == NULL) {
6836                         SCTP_FREE(ca, SCTP_M_COPYAL);
6837                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6838                         return (ENOMEM);
6839                 }
6840         } else {
6841                 /* Gather the length of the send */
6842                 struct mbuf *mat;
6843
6844                 ca->sndlen = 0;
6845                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6846                         ca->sndlen += SCTP_BUF_LEN(mat);
6847                 }
6848         }
6849         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6850         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6851             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6852             SCTP_ASOC_ANY_STATE,
6853             (void *)ca, 0,
6854             sctp_sendall_completes, inp, 1);
6855         if (ret) {
6856                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6857                 SCTP_FREE(ca, SCTP_M_COPYAL);
6858                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6859                 return (EFAULT);
6860         }
6861         return (0);
6862 }
6863
6864 void
6865 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6866 {
6867         struct sctp_tmit_chunk *chk, *nchk;
6868
6869         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6870                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6871                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6872                         asoc->ctrl_queue_cnt--;
6873                         if (chk->data) {
6874                                 sctp_m_freem(chk->data);
6875                                 chk->data = NULL;
6876                         }
6877                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6878                 }
6879         }
6880 }
6881
6882 void
6883 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6884 {
6885         struct sctp_association *asoc;
6886         struct sctp_tmit_chunk *chk, *nchk;
6887         struct sctp_asconf_chunk *acp;
6888
6889         asoc = &stcb->asoc;
6890         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6891                 /* find SCTP_ASCONF chunk in queue */
6892                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6893                         if (chk->data) {
6894                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6895                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6896                                         /* Not Acked yet */
6897                                         break;
6898                                 }
6899                         }
6900                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6901                         asoc->ctrl_queue_cnt--;
6902                         if (chk->data) {
6903                                 sctp_m_freem(chk->data);
6904                                 chk->data = NULL;
6905                         }
6906                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6907                 }
6908         }
6909 }
6910
6911 static void
6912 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6913     struct sctp_association *asoc,
6914     struct sctp_tmit_chunk **data_list,
6915     int bundle_at,
6916     struct sctp_nets *net)
6917 {
6918         int i;
6919         struct sctp_tmit_chunk *tp1;
6920
6921         for (i = 0; i < bundle_at; i++) {
6922                 /* off of the send queue */
6923                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6924                 asoc->send_queue_cnt--;
6925                 if (i > 0) {
6926                         /*
6927                          * Any chunk NOT 0 you zap the time chunk 0 gets
6928                          * zapped or set based on if a RTO measurment is
6929                          * needed.
6930                          */
6931                         data_list[i]->do_rtt = 0;
6932                 }
6933                 /* record time */
6934                 data_list[i]->sent_rcv_time = net->last_sent_time;
6935                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6936                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6937                 if (data_list[i]->whoTo == NULL) {
6938                         data_list[i]->whoTo = net;
6939                         atomic_add_int(&net->ref_count, 1);
6940                 }
6941                 /* on to the sent queue */
6942                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6943                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6944                         struct sctp_tmit_chunk *tpp;
6945
6946                         /* need to move back */
6947         back_up_more:
6948                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6949                         if (tpp == NULL) {
6950                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6951                                 goto all_done;
6952                         }
6953                         tp1 = tpp;
6954                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6955                                 goto back_up_more;
6956                         }
6957                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6958                 } else {
6959                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6960                             data_list[i],
6961                             sctp_next);
6962                 }
6963 all_done:
6964                 /* This does not lower until the cum-ack passes it */
6965                 asoc->sent_queue_cnt++;
6966                 if ((asoc->peers_rwnd <= 0) &&
6967                     (asoc->total_flight == 0) &&
6968                     (bundle_at == 1)) {
6969                         /* Mark the chunk as being a window probe */
6970                         SCTP_STAT_INCR(sctps_windowprobed);
6971                 }
6972 #ifdef SCTP_AUDITING_ENABLED
6973                 sctp_audit_log(0xC2, 3);
6974 #endif
6975                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6976                 data_list[i]->snd_count = 1;
6977                 data_list[i]->rec.data.chunk_was_revoked = 0;
6978                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6979                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6980                             data_list[i]->whoTo->flight_size,
6981                             data_list[i]->book_size,
6982                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
6983                             data_list[i]->rec.data.tsn);
6984                 }
6985                 sctp_flight_size_increase(data_list[i]);
6986                 sctp_total_flight_increase(stcb, data_list[i]);
6987                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6988                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6989                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6990                 }
6991                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6992                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6993                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6994                         /* SWS sender side engages */
6995                         asoc->peers_rwnd = 0;
6996                 }
6997         }
6998         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6999                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7000         }
7001 }
7002
7003 static void
7004 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
7005 {
7006         struct sctp_tmit_chunk *chk, *nchk;
7007
7008         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7009                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7010                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7011                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7012                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7013                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7014                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7015                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7016                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7017                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7018                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7019                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7020                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7021                         /* Stray chunks must be cleaned up */
7022         clean_up_anyway:
7023                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7024                         asoc->ctrl_queue_cnt--;
7025                         if (chk->data) {
7026                                 sctp_m_freem(chk->data);
7027                                 chk->data = NULL;
7028                         }
7029                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7030                                 asoc->fwd_tsn_cnt--;
7031                         }
7032                         sctp_free_a_chunk(stcb, chk, so_locked);
7033                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7034                         /* special handling, we must look into the param */
7035                         if (chk != asoc->str_reset) {
7036                                 goto clean_up_anyway;
7037                         }
7038                 }
7039         }
7040 }
7041
7042 static uint32_t
7043 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7044     uint32_t space_left, uint32_t frag_point, int eeor_on)
7045 {
7046         /*
7047          * Make a decision on if I should split a msg into multiple parts.
7048          * This is only asked of incomplete messages.
7049          */
7050         if (eeor_on) {
7051                 /*
7052                  * If we are doing EEOR we need to always send it if its the
7053                  * entire thing, since it might be all the guy is putting in
7054                  * the hopper.
7055                  */
7056                 if (space_left >= length) {
7057                         /*-
7058                          * If we have data outstanding,
7059                          * we get another chance when the sack
7060                          * arrives to transmit - wait for more data
7061                          */
7062                         if (stcb->asoc.total_flight == 0) {
7063                                 /*
7064                                  * If nothing is in flight, we zero the
7065                                  * packet counter.
7066                                  */
7067                                 return (length);
7068                         }
7069                         return (0);
7070
7071                 } else {
7072                         /* You can fill the rest */
7073                         return (space_left);
7074                 }
7075         }
7076         /*-
7077          * For those strange folk that make the send buffer
7078          * smaller than our fragmentation point, we can't
7079          * get a full msg in so we have to allow splitting.
7080          */
7081         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7082                 return (length);
7083         }
7084         if ((length <= space_left) ||
7085             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7086                 /* Sub-optimial residual don't split in non-eeor mode. */
7087                 return (0);
7088         }
7089         /*
7090          * If we reach here length is larger than the space_left. Do we wish
7091          * to split it for the sake of packet putting together?
7092          */
7093         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7094                 /* Its ok to split it */
7095                 return (min(space_left, frag_point));
7096         }
7097         /* Nope, can't split */
7098         return (0);
7099 }
7100
7101 static uint32_t
7102 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7103     struct sctp_stream_out *strq,
7104     uint32_t space_left,
7105     uint32_t frag_point,
7106     int *giveup,
7107     int eeor_mode,
7108     int *bail,
7109     int so_locked)
7110 {
7111         /* Move from the stream to the send_queue keeping track of the total */
7112         struct sctp_association *asoc;
7113         struct sctp_stream_queue_pending *sp;
7114         struct sctp_tmit_chunk *chk;
7115         struct sctp_data_chunk *dchkh = NULL;
7116         struct sctp_idata_chunk *ndchkh = NULL;
7117         uint32_t to_move, length;
7118         int leading;
7119         uint8_t rcv_flags = 0;
7120         uint8_t some_taken;
7121         uint8_t send_lock_up = 0;
7122
7123         SCTP_TCB_LOCK_ASSERT(stcb);
7124         asoc = &stcb->asoc;
7125 one_more_time:
7126         /* sa_ignore FREED_MEMORY */
7127         sp = TAILQ_FIRST(&strq->outqueue);
7128         if (sp == NULL) {
7129                 if (send_lock_up == 0) {
7130                         SCTP_TCB_SEND_LOCK(stcb);
7131                         send_lock_up = 1;
7132                 }
7133                 sp = TAILQ_FIRST(&strq->outqueue);
7134                 if (sp) {
7135                         goto one_more_time;
7136                 }
7137                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7138                     (stcb->asoc.idata_supported == 0) &&
7139                     (strq->last_msg_incomplete)) {
7140                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7141                             strq->sid,
7142                             strq->last_msg_incomplete);
7143                         strq->last_msg_incomplete = 0;
7144                 }
7145                 to_move = 0;
7146                 if (send_lock_up) {
7147                         SCTP_TCB_SEND_UNLOCK(stcb);
7148                         send_lock_up = 0;
7149                 }
7150                 goto out_of;
7151         }
7152         if ((sp->msg_is_complete) && (sp->length == 0)) {
7153                 if (sp->sender_all_done) {
7154                         /*
7155                          * We are doing deferred cleanup. Last time through
7156                          * when we took all the data the sender_all_done was
7157                          * not set.
7158                          */
7159                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7160                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7161                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7162                                     sp->sender_all_done,
7163                                     sp->length,
7164                                     sp->msg_is_complete,
7165                                     sp->put_last_out,
7166                                     send_lock_up);
7167                         }
7168                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7169                                 SCTP_TCB_SEND_LOCK(stcb);
7170                                 send_lock_up = 1;
7171                         }
7172                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7173                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7174                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7175                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7176                             (strq->chunks_on_queues == 0) &&
7177                             TAILQ_EMPTY(&strq->outqueue)) {
7178                                 stcb->asoc.trigger_reset = 1;
7179                         }
7180                         if (sp->net) {
7181                                 sctp_free_remote_addr(sp->net);
7182                                 sp->net = NULL;
7183                         }
7184                         if (sp->data) {
7185                                 sctp_m_freem(sp->data);
7186                                 sp->data = NULL;
7187                         }
7188                         sctp_free_a_strmoq(stcb, sp, so_locked);
7189                         /* we can't be locked to it */
7190                         if (send_lock_up) {
7191                                 SCTP_TCB_SEND_UNLOCK(stcb);
7192                                 send_lock_up = 0;
7193                         }
7194                         /* back to get the next msg */
7195                         goto one_more_time;
7196                 } else {
7197                         /*
7198                          * sender just finished this but still holds a
7199                          * reference
7200                          */
7201                         *giveup = 1;
7202                         to_move = 0;
7203                         goto out_of;
7204                 }
7205         } else {
7206                 /* is there some to get */
7207                 if (sp->length == 0) {
7208                         /* no */
7209                         *giveup = 1;
7210                         to_move = 0;
7211                         goto out_of;
7212                 } else if (sp->discard_rest) {
7213                         if (send_lock_up == 0) {
7214                                 SCTP_TCB_SEND_LOCK(stcb);
7215                                 send_lock_up = 1;
7216                         }
7217                         /* Whack down the size */
7218                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7219                         if ((stcb->sctp_socket != NULL) &&
7220                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7221                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7222                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7223                         }
7224                         if (sp->data) {
7225                                 sctp_m_freem(sp->data);
7226                                 sp->data = NULL;
7227                                 sp->tail_mbuf = NULL;
7228                         }
7229                         sp->length = 0;
7230                         sp->some_taken = 1;
7231                         *giveup = 1;
7232                         to_move = 0;
7233                         goto out_of;
7234                 }
7235         }
7236         some_taken = sp->some_taken;
7237 re_look:
7238         length = sp->length;
7239         if (sp->msg_is_complete) {
7240                 /* The message is complete */
7241                 to_move = min(length, frag_point);
7242                 if (to_move == length) {
7243                         /* All of it fits in the MTU */
7244                         if (sp->some_taken) {
7245                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7246                         } else {
7247                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7248                         }
7249                         sp->put_last_out = 1;
7250                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7251                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7252                         }
7253                 } else {
7254                         /* Not all of it fits, we fragment */
7255                         if (sp->some_taken == 0) {
7256                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7257                         }
7258                         sp->some_taken = 1;
7259                 }
7260         } else {
7261                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7262                 if (to_move) {
7263                         /*-
7264                          * We use a snapshot of length in case it
7265                          * is expanding during the compare.
7266                          */
7267                         uint32_t llen;
7268
7269                         llen = length;
7270                         if (to_move >= llen) {
7271                                 to_move = llen;
7272                                 if (send_lock_up == 0) {
7273                                         /*-
7274                                          * We are taking all of an incomplete msg
7275                                          * thus we need a send lock.
7276                                          */
7277                                         SCTP_TCB_SEND_LOCK(stcb);
7278                                         send_lock_up = 1;
7279                                         if (sp->msg_is_complete) {
7280                                                 /*
7281                                                  * the sender finished the
7282                                                  * msg
7283                                                  */
7284                                                 goto re_look;
7285                                         }
7286                                 }
7287                         }
7288                         if (sp->some_taken == 0) {
7289                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7290                                 sp->some_taken = 1;
7291                         }
7292                 } else {
7293                         /* Nothing to take. */
7294                         *giveup = 1;
7295                         to_move = 0;
7296                         goto out_of;
7297                 }
7298         }
7299
7300         /* If we reach here, we can copy out a chunk */
7301         sctp_alloc_a_chunk(stcb, chk);
7302         if (chk == NULL) {
7303                 /* No chunk memory */
7304                 *giveup = 1;
7305                 to_move = 0;
7306                 goto out_of;
7307         }
7308         /*
7309          * Setup for unordered if needed by looking at the user sent info
7310          * flags.
7311          */
7312         if (sp->sinfo_flags & SCTP_UNORDERED) {
7313                 rcv_flags |= SCTP_DATA_UNORDERED;
7314         }
7315         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7316             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7317                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7318         }
7319         /* clear out the chunk before setting up */
7320         memset(chk, 0, sizeof(*chk));
7321         chk->rec.data.rcv_flags = rcv_flags;
7322
7323         if (to_move >= length) {
7324                 /* we think we can steal the whole thing */
7325                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7326                         SCTP_TCB_SEND_LOCK(stcb);
7327                         send_lock_up = 1;
7328                 }
7329                 if (to_move < sp->length) {
7330                         /* bail, it changed */
7331                         goto dont_do_it;
7332                 }
7333                 chk->data = sp->data;
7334                 chk->last_mbuf = sp->tail_mbuf;
7335                 /* register the stealing */
7336                 sp->data = sp->tail_mbuf = NULL;
7337         } else {
7338                 struct mbuf *m;
7339
7340 dont_do_it:
7341                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7342                 chk->last_mbuf = NULL;
7343                 if (chk->data == NULL) {
7344                         sp->some_taken = some_taken;
7345                         sctp_free_a_chunk(stcb, chk, so_locked);
7346                         *bail = 1;
7347                         to_move = 0;
7348                         goto out_of;
7349                 }
7350 #ifdef SCTP_MBUF_LOGGING
7351                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7352                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7353                 }
7354 #endif
7355                 /* Pull off the data */
7356                 m_adj(sp->data, to_move);
7357                 /* Now lets work our way down and compact it */
7358                 m = sp->data;
7359                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7360                         sp->data = SCTP_BUF_NEXT(m);
7361                         SCTP_BUF_NEXT(m) = NULL;
7362                         if (sp->tail_mbuf == m) {
7363                                 /*-
7364                                  * Freeing tail? TSNH since
7365                                  * we supposedly were taking less
7366                                  * than the sp->length.
7367                                  */
7368 #ifdef INVARIANTS
7369                                 panic("Huh, freing tail? - TSNH");
7370 #else
7371                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7372                                 sp->tail_mbuf = sp->data = NULL;
7373                                 sp->length = 0;
7374 #endif
7375                         }
7376                         sctp_m_free(m);
7377                         m = sp->data;
7378                 }
7379         }
7380         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7381                 chk->copy_by_ref = 1;
7382         } else {
7383                 chk->copy_by_ref = 0;
7384         }
7385         /*
7386          * get last_mbuf and counts of mb usage This is ugly but hopefully
7387          * its only one mbuf.
7388          */
7389         if (chk->last_mbuf == NULL) {
7390                 chk->last_mbuf = chk->data;
7391                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7392                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7393                 }
7394         }
7395
7396         if (to_move > length) {
7397                 /*- This should not happen either
7398                  * since we always lower to_move to the size
7399                  * of sp->length if its larger.
7400                  */
7401 #ifdef INVARIANTS
7402                 panic("Huh, how can to_move be larger?");
7403 #else
7404                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7405                 sp->length = 0;
7406 #endif
7407         } else {
7408                 atomic_subtract_int(&sp->length, to_move);
7409         }
7410         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7411         if (M_LEADINGSPACE(chk->data) < leading) {
7412                 /* Not enough room for a chunk header, get some */
7413                 struct mbuf *m;
7414
7415                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7416                 if (m == NULL) {
7417                         /*
7418                          * we're in trouble here. _PREPEND below will free
7419                          * all the data if there is no leading space, so we
7420                          * must put the data back and restore.
7421                          */
7422                         if (send_lock_up == 0) {
7423                                 SCTP_TCB_SEND_LOCK(stcb);
7424                                 send_lock_up = 1;
7425                         }
7426                         if (sp->data == NULL) {
7427                                 /* unsteal the data */
7428                                 sp->data = chk->data;
7429                                 sp->tail_mbuf = chk->last_mbuf;
7430                         } else {
7431                                 struct mbuf *m_tmp;
7432
7433                                 /* reassemble the data */
7434                                 m_tmp = sp->data;
7435                                 sp->data = chk->data;
7436                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7437                         }
7438                         sp->some_taken = some_taken;
7439                         atomic_add_int(&sp->length, to_move);
7440                         chk->data = NULL;
7441                         *bail = 1;
7442                         sctp_free_a_chunk(stcb, chk, so_locked);
7443                         to_move = 0;
7444                         goto out_of;
7445                 } else {
7446                         SCTP_BUF_LEN(m) = 0;
7447                         SCTP_BUF_NEXT(m) = chk->data;
7448                         chk->data = m;
7449                         M_ALIGN(chk->data, 4);
7450                 }
7451         }
7452         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7453         if (chk->data == NULL) {
7454                 /* HELP, TSNH since we assured it would not above? */
7455 #ifdef INVARIANTS
7456                 panic("prepend failes HELP?");
7457 #else
7458                 SCTP_PRINTF("prepend fails HELP?\n");
7459                 sctp_free_a_chunk(stcb, chk, so_locked);
7460 #endif
7461                 *bail = 1;
7462                 to_move = 0;
7463                 goto out_of;
7464         }
7465         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7466         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7467         chk->book_size_scale = 0;
7468         chk->sent = SCTP_DATAGRAM_UNSENT;
7469
7470         chk->flags = 0;
7471         chk->asoc = &stcb->asoc;
7472         chk->pad_inplace = 0;
7473         chk->no_fr_allowed = 0;
7474         if (stcb->asoc.idata_supported == 0) {
7475                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7476                         /* Just use 0. The receiver ignores the values. */
7477                         chk->rec.data.mid = 0;
7478                 } else {
7479                         chk->rec.data.mid = strq->next_mid_ordered;
7480                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7481                                 strq->next_mid_ordered++;
7482                         }
7483                 }
7484         } else {
7485                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7486                         chk->rec.data.mid = strq->next_mid_unordered;
7487                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7488                                 strq->next_mid_unordered++;
7489                         }
7490                 } else {
7491                         chk->rec.data.mid = strq->next_mid_ordered;
7492                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7493                                 strq->next_mid_ordered++;
7494                         }
7495                 }
7496         }
7497         chk->rec.data.sid = sp->sid;
7498         chk->rec.data.ppid = sp->ppid;
7499         chk->rec.data.context = sp->context;
7500         chk->rec.data.doing_fast_retransmit = 0;
7501
7502         chk->rec.data.timetodrop = sp->ts;
7503         chk->flags = sp->act_flags;
7504
7505         if (sp->net) {
7506                 chk->whoTo = sp->net;
7507                 atomic_add_int(&chk->whoTo->ref_count, 1);
7508         } else
7509                 chk->whoTo = NULL;
7510
7511         if (sp->holds_key_ref) {
7512                 chk->auth_keyid = sp->auth_keyid;
7513                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7514                 chk->holds_key_ref = 1;
7515         }
7516         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7517         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7518                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7519                     (uint32_t)(uintptr_t)stcb, sp->length,
7520                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7521                     chk->rec.data.tsn);
7522         }
7523         if (stcb->asoc.idata_supported == 0) {
7524                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7525         } else {
7526                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7527         }
7528         /*
7529          * Put the rest of the things in place now. Size was done earlier in
7530          * previous loop prior to padding.
7531          */
7532
7533 #ifdef SCTP_ASOCLOG_OF_TSNS
7534         SCTP_TCB_LOCK_ASSERT(stcb);
7535         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7536                 asoc->tsn_out_at = 0;
7537                 asoc->tsn_out_wrapped = 1;
7538         }
7539         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7540         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7541         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7542         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7543         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7544         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7545         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7546         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7547         asoc->tsn_out_at++;
7548 #endif
7549         if (stcb->asoc.idata_supported == 0) {
7550                 dchkh->ch.chunk_type = SCTP_DATA;
7551                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7552                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7553                 dchkh->dp.sid = htons(strq->sid);
7554                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7555                 dchkh->dp.ppid = chk->rec.data.ppid;
7556                 dchkh->ch.chunk_length = htons(chk->send_size);
7557         } else {
7558                 ndchkh->ch.chunk_type = SCTP_IDATA;
7559                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7560                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7561                 ndchkh->dp.sid = htons(strq->sid);
7562                 ndchkh->dp.reserved = htons(0);
7563                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7564                 if (sp->fsn == 0)
7565                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7566                 else
7567                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7568                 sp->fsn++;
7569                 ndchkh->ch.chunk_length = htons(chk->send_size);
7570         }
7571         /* Now advance the chk->send_size by the actual pad needed. */
7572         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7573                 /* need a pad */
7574                 struct mbuf *lm;
7575                 int pads;
7576
7577                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7578                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7579                 if (lm != NULL) {
7580                         chk->last_mbuf = lm;
7581                         chk->pad_inplace = 1;
7582                 }
7583                 chk->send_size += pads;
7584         }
7585         if (PR_SCTP_ENABLED(chk->flags)) {
7586                 asoc->pr_sctp_cnt++;
7587         }
7588         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7589                 /* All done pull and kill the message */
7590                 if (sp->put_last_out == 0) {
7591                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7592                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7593                             sp->sender_all_done,
7594                             sp->length,
7595                             sp->msg_is_complete,
7596                             sp->put_last_out,
7597                             send_lock_up);
7598                 }
7599                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7600                         SCTP_TCB_SEND_LOCK(stcb);
7601                         send_lock_up = 1;
7602                 }
7603                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7604                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7605                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7606                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7607                     (strq->chunks_on_queues == 0) &&
7608                     TAILQ_EMPTY(&strq->outqueue)) {
7609                         stcb->asoc.trigger_reset = 1;
7610                 }
7611                 if (sp->net) {
7612                         sctp_free_remote_addr(sp->net);
7613                         sp->net = NULL;
7614                 }
7615                 if (sp->data) {
7616                         sctp_m_freem(sp->data);
7617                         sp->data = NULL;
7618                 }
7619                 sctp_free_a_strmoq(stcb, sp, so_locked);
7620         }
7621         asoc->chunks_on_out_queue++;
7622         strq->chunks_on_queues++;
7623         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7624         asoc->send_queue_cnt++;
7625 out_of:
7626         if (send_lock_up) {
7627                 SCTP_TCB_SEND_UNLOCK(stcb);
7628         }
7629         return (to_move);
7630 }
7631
7632 static void
7633 sctp_fill_outqueue(struct sctp_tcb *stcb,
7634     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked)
7635 {
7636         struct sctp_association *asoc;
7637         struct sctp_stream_out *strq;
7638         uint32_t space_left, moved, total_moved;
7639         int bail, giveup;
7640
7641         SCTP_TCB_LOCK_ASSERT(stcb);
7642         asoc = &stcb->asoc;
7643         total_moved = 0;
7644         switch (net->ro._l_addr.sa.sa_family) {
7645 #ifdef INET
7646         case AF_INET:
7647                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7648                 break;
7649 #endif
7650 #ifdef INET6
7651         case AF_INET6:
7652                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7653                 break;
7654 #endif
7655         default:
7656                 /* TSNH */
7657                 space_left = net->mtu;
7658                 break;
7659         }
7660         /* Need an allowance for the data chunk header too */
7661         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7662
7663         /* must make even word boundary */
7664         space_left &= 0xfffffffc;
7665         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7666         giveup = 0;
7667         bail = 0;
7668         while ((space_left > 0) && (strq != NULL)) {
7669                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7670                     &giveup, eeor_mode, &bail, so_locked);
7671                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7672                 if ((giveup != 0) || (bail != 0)) {
7673                         break;
7674                 }
7675                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7676                 total_moved += moved;
7677                 if (space_left >= moved) {
7678                         space_left -= moved;
7679                 } else {
7680                         space_left = 0;
7681                 }
7682                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7683                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7684                 } else {
7685                         space_left = 0;
7686                 }
7687                 space_left &= 0xfffffffc;
7688         }
7689         if (bail != 0)
7690                 *quit_now = 1;
7691
7692         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7693
7694         if (total_moved == 0) {
7695                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7696                     (net == stcb->asoc.primary_destination)) {
7697                         /* ran dry for primary network net */
7698                         SCTP_STAT_INCR(sctps_primary_randry);
7699                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7700                         /* ran dry with CMT on */
7701                         SCTP_STAT_INCR(sctps_cmt_randry);
7702                 }
7703         }
7704 }
7705
7706 void
7707 sctp_fix_ecn_echo(struct sctp_association *asoc)
7708 {
7709         struct sctp_tmit_chunk *chk;
7710
7711         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7712                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7713                         chk->sent = SCTP_DATAGRAM_UNSENT;
7714                 }
7715         }
7716 }
7717
7718 void
7719 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7720 {
7721         struct sctp_association *asoc;
7722         struct sctp_tmit_chunk *chk;
7723         struct sctp_stream_queue_pending *sp;
7724         unsigned int i;
7725
7726         if (net == NULL) {
7727                 return;
7728         }
7729         asoc = &stcb->asoc;
7730         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7731                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7732                         if (sp->net == net) {
7733                                 sctp_free_remote_addr(sp->net);
7734                                 sp->net = NULL;
7735                         }
7736                 }
7737         }
7738         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7739                 if (chk->whoTo == net) {
7740                         sctp_free_remote_addr(chk->whoTo);
7741                         chk->whoTo = NULL;
7742                 }
7743         }
7744 }
7745
7746 int
7747 sctp_med_chunk_output(struct sctp_inpcb *inp,
7748     struct sctp_tcb *stcb,
7749     struct sctp_association *asoc,
7750     int *num_out,
7751     int *reason_code,
7752     int control_only, int from_where,
7753     struct timeval *now, int *now_filled, int frag_point, int so_locked)
7754 {
7755         /**
7756          * Ok this is the generic chunk service queue. we must do the
7757          * following:
7758          * - Service the stream queue that is next, moving any
7759          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7760          *   LAST to the out queue in one pass) and assigning TSN's. This
7761          *   only applys though if the peer does not support NDATA. For NDATA
7762          *   chunks its ok to not send the entire message ;-)
7763          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7764          *   fomulate and send the low level chunks. Making sure to combine
7765          *   any control in the control chunk queue also.
7766          */
7767         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7768         struct mbuf *outchain, *endoutchain;
7769         struct sctp_tmit_chunk *chk, *nchk;
7770
7771         /* temp arrays for unlinking */
7772         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7773         int no_fragmentflg, error;
7774         unsigned int max_rwnd_per_dest, max_send_per_dest;
7775         int one_chunk, hbflag, skip_data_for_this_net;
7776         int asconf, cookie, no_out_cnt;
7777         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7778         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7779         int tsns_sent = 0;
7780         uint32_t auth_offset;
7781         struct sctp_auth_chunk *auth;
7782         uint16_t auth_keyid;
7783         int override_ok = 1;
7784         int skip_fill_up = 0;
7785         int data_auth_reqd = 0;
7786
7787         /*
7788          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7789          * destination.
7790          */
7791         int quit_now = 0;
7792
7793         *num_out = 0;
7794         *reason_code = 0;
7795         auth_keyid = stcb->asoc.authinfo.active_keyid;
7796         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7797             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7798             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7799                 eeor_mode = 1;
7800         } else {
7801                 eeor_mode = 0;
7802         }
7803         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7804         /*
7805          * First lets prime the pump. For each destination, if there is room
7806          * in the flight size, attempt to pull an MTU's worth out of the
7807          * stream queues into the general send_queue
7808          */
7809 #ifdef SCTP_AUDITING_ENABLED
7810         sctp_audit_log(0xC2, 2);
7811 #endif
7812         SCTP_TCB_LOCK_ASSERT(stcb);
7813         hbflag = 0;
7814         if (control_only)
7815                 no_data_chunks = 1;
7816         else
7817                 no_data_chunks = 0;
7818
7819         /* Nothing to possible to send? */
7820         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7821             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7822             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7823             TAILQ_EMPTY(&asoc->send_queue) &&
7824             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7825 nothing_to_send:
7826                 *reason_code = 9;
7827                 return (0);
7828         }
7829         if (asoc->peers_rwnd == 0) {
7830                 /* No room in peers rwnd */
7831                 *reason_code = 1;
7832                 if (asoc->total_flight > 0) {
7833                         /* we are allowed one chunk in flight */
7834                         no_data_chunks = 1;
7835                 }
7836         }
7837         if (stcb->asoc.ecn_echo_cnt_onq) {
7838                 /* Record where a sack goes, if any */
7839                 if (no_data_chunks &&
7840                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7841                         /* Nothing but ECNe to send - we don't do that */
7842                         goto nothing_to_send;
7843                 }
7844                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7845                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7846                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7847                                 sack_goes_to = chk->whoTo;
7848                                 break;
7849                         }
7850                 }
7851         }
7852         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7853         if (stcb->sctp_socket)
7854                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7855         else
7856                 max_send_per_dest = 0;
7857         if (no_data_chunks == 0) {
7858                 /* How many non-directed chunks are there? */
7859                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7860                         if (chk->whoTo == NULL) {
7861                                 /*
7862                                  * We already have non-directed chunks on
7863                                  * the queue, no need to do a fill-up.
7864                                  */
7865                                 skip_fill_up = 1;
7866                                 break;
7867                         }
7868                 }
7869         }
7870         if ((no_data_chunks == 0) &&
7871             (skip_fill_up == 0) &&
7872             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7873                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7874                         /*
7875                          * This for loop we are in takes in each net, if
7876                          * its's got space in cwnd and has data sent to it
7877                          * (when CMT is off) then it calls
7878                          * sctp_fill_outqueue for the net. This gets data on
7879                          * the send queue for that network.
7880                          *
7881                          * In sctp_fill_outqueue TSN's are assigned and data
7882                          * is copied out of the stream buffers. Note mostly
7883                          * copy by reference (we hope).
7884                          */
7885                         net->window_probe = 0;
7886                         if ((net != stcb->asoc.alternate) &&
7887                             ((net->dest_state & SCTP_ADDR_PF) ||
7888                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7889                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7890                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7891                                         sctp_log_cwnd(stcb, net, 1,
7892                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7893                                 }
7894                                 continue;
7895                         }
7896                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7897                             (net->flight_size == 0)) {
7898                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7899                         }
7900                         if (net->flight_size >= net->cwnd) {
7901                                 /* skip this network, no room - can't fill */
7902                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7903                                         sctp_log_cwnd(stcb, net, 3,
7904                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7905                                 }
7906                                 continue;
7907                         }
7908                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7909                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7910                         }
7911                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7912                         if (quit_now) {
7913                                 /* memory alloc failure */
7914                                 no_data_chunks = 1;
7915                                 break;
7916                         }
7917                 }
7918         }
7919         /* now service each destination and send out what we can for it */
7920         /* Nothing to send? */
7921         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7922             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7923             TAILQ_EMPTY(&asoc->send_queue)) {
7924                 *reason_code = 8;
7925                 return (0);
7926         }
7927
7928         if (asoc->sctp_cmt_on_off > 0) {
7929                 /* get the last start point */
7930                 start_at = asoc->last_net_cmt_send_started;
7931                 if (start_at == NULL) {
7932                         /* null so to beginning */
7933                         start_at = TAILQ_FIRST(&asoc->nets);
7934                 } else {
7935                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7936                         if (start_at == NULL) {
7937                                 start_at = TAILQ_FIRST(&asoc->nets);
7938                         }
7939                 }
7940                 asoc->last_net_cmt_send_started = start_at;
7941         } else {
7942                 start_at = TAILQ_FIRST(&asoc->nets);
7943         }
7944         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7945                 if (chk->whoTo == NULL) {
7946                         if (asoc->alternate) {
7947                                 chk->whoTo = asoc->alternate;
7948                         } else {
7949                                 chk->whoTo = asoc->primary_destination;
7950                         }
7951                         atomic_add_int(&chk->whoTo->ref_count, 1);
7952                 }
7953         }
7954         old_start_at = NULL;
7955 again_one_more_time:
7956         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7957                 /* how much can we send? */
7958                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7959                 if (old_start_at && (old_start_at == net)) {
7960                         /* through list ocmpletely. */
7961                         break;
7962                 }
7963                 tsns_sent = 0xa;
7964                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7965                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7966                     (net->flight_size >= net->cwnd)) {
7967                         /*
7968                          * Nothing on control or asconf and flight is full,
7969                          * we can skip even in the CMT case.
7970                          */
7971                         continue;
7972                 }
7973                 bundle_at = 0;
7974                 endoutchain = outchain = NULL;
7975                 auth = NULL;
7976                 auth_offset = 0;
7977                 no_fragmentflg = 1;
7978                 one_chunk = 0;
7979                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7980                         skip_data_for_this_net = 1;
7981                 } else {
7982                         skip_data_for_this_net = 0;
7983                 }
7984                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7985 #ifdef INET
7986                 case AF_INET:
7987                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7988                         break;
7989 #endif
7990 #ifdef INET6
7991                 case AF_INET6:
7992                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
7993                         break;
7994 #endif
7995                 default:
7996                         /* TSNH */
7997                         mtu = net->mtu;
7998                         break;
7999                 }
8000                 mx_mtu = mtu;
8001                 to_out = 0;
8002                 if (mtu > asoc->peers_rwnd) {
8003                         if (asoc->total_flight > 0) {
8004                                 /* We have a packet in flight somewhere */
8005                                 r_mtu = asoc->peers_rwnd;
8006                         } else {
8007                                 /* We are always allowed to send one MTU out */
8008                                 one_chunk = 1;
8009                                 r_mtu = mtu;
8010                         }
8011                 } else {
8012                         r_mtu = mtu;
8013                 }
8014                 error = 0;
8015                 /************************/
8016                 /* ASCONF transmission */
8017                 /************************/
8018                 /* Now first lets go through the asconf queue */
8019                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8020                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8021                                 continue;
8022                         }
8023                         if (chk->whoTo == NULL) {
8024                                 if (asoc->alternate == NULL) {
8025                                         if (asoc->primary_destination != net) {
8026                                                 break;
8027                                         }
8028                                 } else {
8029                                         if (asoc->alternate != net) {
8030                                                 break;
8031                                         }
8032                                 }
8033                         } else {
8034                                 if (chk->whoTo != net) {
8035                                         break;
8036                                 }
8037                         }
8038                         if (chk->data == NULL) {
8039                                 break;
8040                         }
8041                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8042                             chk->sent != SCTP_DATAGRAM_RESEND) {
8043                                 break;
8044                         }
8045                         /*
8046                          * if no AUTH is yet included and this chunk
8047                          * requires it, make sure to account for it.  We
8048                          * don't apply the size until the AUTH chunk is
8049                          * actually added below in case there is no room for
8050                          * this chunk. NOTE: we overload the use of "omtu"
8051                          * here
8052                          */
8053                         if ((auth == NULL) &&
8054                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8055                             stcb->asoc.peer_auth_chunks)) {
8056                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8057                         } else
8058                                 omtu = 0;
8059                         /* Here we do NOT factor the r_mtu */
8060                         if ((chk->send_size < (int)(mtu - omtu)) ||
8061                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8062                                 /*
8063                                  * We probably should glom the mbuf chain
8064                                  * from the chk->data for control but the
8065                                  * problem is it becomes yet one more level
8066                                  * of tracking to do if for some reason
8067                                  * output fails. Then I have got to
8068                                  * reconstruct the merged control chain.. el
8069                                  * yucko.. for now we take the easy way and
8070                                  * do the copy
8071                                  */
8072                                 /*
8073                                  * Add an AUTH chunk, if chunk requires it
8074                                  * save the offset into the chain for AUTH
8075                                  */
8076                                 if ((auth == NULL) &&
8077                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8078                                     stcb->asoc.peer_auth_chunks))) {
8079                                         outchain = sctp_add_auth_chunk(outchain,
8080                                             &endoutchain,
8081                                             &auth,
8082                                             &auth_offset,
8083                                             stcb,
8084                                             chk->rec.chunk_id.id);
8085                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8086                                 }
8087                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8088                                     (int)chk->rec.chunk_id.can_take_data,
8089                                     chk->send_size, chk->copy_by_ref);
8090                                 if (outchain == NULL) {
8091                                         *reason_code = 8;
8092                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8093                                         return (ENOMEM);
8094                                 }
8095                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8096                                 /* update our MTU size */
8097                                 if (mtu > (chk->send_size + omtu))
8098                                         mtu -= (chk->send_size + omtu);
8099                                 else
8100                                         mtu = 0;
8101                                 to_out += (chk->send_size + omtu);
8102                                 /* Do clear IP_DF ? */
8103                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8104                                         no_fragmentflg = 0;
8105                                 }
8106                                 if (chk->rec.chunk_id.can_take_data)
8107                                         chk->data = NULL;
8108                                 /*
8109                                  * set hb flag since we can use these for
8110                                  * RTO
8111                                  */
8112                                 hbflag = 1;
8113                                 asconf = 1;
8114                                 /*
8115                                  * should sysctl this: don't bundle data
8116                                  * with ASCONF since it requires AUTH
8117                                  */
8118                                 no_data_chunks = 1;
8119                                 chk->sent = SCTP_DATAGRAM_SENT;
8120                                 if (chk->whoTo == NULL) {
8121                                         chk->whoTo = net;
8122                                         atomic_add_int(&net->ref_count, 1);
8123                                 }
8124                                 chk->snd_count++;
8125                                 if (mtu == 0) {
8126                                         /*
8127                                          * Ok we are out of room but we can
8128                                          * output without effecting the
8129                                          * flight size since this little guy
8130                                          * is a control only packet.
8131                                          */
8132                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8133                                         /*
8134                                          * do NOT clear the asconf flag as
8135                                          * it is used to do appropriate
8136                                          * source address selection.
8137                                          */
8138                                         if (*now_filled == 0) {
8139                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8140                                                 *now_filled = 1;
8141                                         }
8142                                         net->last_sent_time = *now;
8143                                         hbflag = 0;
8144                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8145                                             (struct sockaddr *)&net->ro._l_addr,
8146                                             outchain, auth_offset, auth,
8147                                             stcb->asoc.authinfo.active_keyid,
8148                                             no_fragmentflg, 0, asconf,
8149                                             inp->sctp_lport, stcb->rport,
8150                                             htonl(stcb->asoc.peer_vtag),
8151                                             net->port, NULL,
8152                                             0, 0,
8153                                             so_locked))) {
8154                                                 /*
8155                                                  * error, we could not
8156                                                  * output
8157                                                  */
8158                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8159                                                 if (from_where == 0) {
8160                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8161                                                 }
8162                                                 if (error == ENOBUFS) {
8163                                                         asoc->ifp_had_enobuf = 1;
8164                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8165                                                 }
8166                                                 /* error, could not output */
8167                                                 if (error == EHOSTUNREACH) {
8168                                                         /*
8169                                                          * Destination went
8170                                                          * unreachable
8171                                                          * during this send
8172                                                          */
8173                                                         sctp_move_chunks_from_net(stcb, net);
8174                                                 }
8175                                                 *reason_code = 7;
8176                                                 break;
8177                                         } else {
8178                                                 asoc->ifp_had_enobuf = 0;
8179                                         }
8180                                         /*
8181                                          * increase the number we sent, if a
8182                                          * cookie is sent we don't tell them
8183                                          * any was sent out.
8184                                          */
8185                                         outchain = endoutchain = NULL;
8186                                         auth = NULL;
8187                                         auth_offset = 0;
8188                                         if (!no_out_cnt)
8189                                                 *num_out += ctl_cnt;
8190                                         /* recalc a clean slate and setup */
8191                                         switch (net->ro._l_addr.sa.sa_family) {
8192 #ifdef INET
8193                                         case AF_INET:
8194                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8195                                                 break;
8196 #endif
8197 #ifdef INET6
8198                                         case AF_INET6:
8199                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8200                                                 break;
8201 #endif
8202                                         default:
8203                                                 /* TSNH */
8204                                                 mtu = net->mtu;
8205                                                 break;
8206                                         }
8207                                         to_out = 0;
8208                                         no_fragmentflg = 1;
8209                                 }
8210                         }
8211                 }
8212                 if (error != 0) {
8213                         /* try next net */
8214                         continue;
8215                 }
8216                 /************************/
8217                 /* Control transmission */
8218                 /************************/
8219                 /* Now first lets go through the control queue */
8220                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8221                         if ((sack_goes_to) &&
8222                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8223                             (chk->whoTo != sack_goes_to)) {
8224                                 /*
8225                                  * if we have a sack in queue, and we are
8226                                  * looking at an ecn echo that is NOT queued
8227                                  * to where the sack is going..
8228                                  */
8229                                 if (chk->whoTo == net) {
8230                                         /*
8231                                          * Don't transmit it to where its
8232                                          * going (current net)
8233                                          */
8234                                         continue;
8235                                 } else if (sack_goes_to == net) {
8236                                         /*
8237                                          * But do transmit it to this
8238                                          * address
8239                                          */
8240                                         goto skip_net_check;
8241                                 }
8242                         }
8243                         if (chk->whoTo == NULL) {
8244                                 if (asoc->alternate == NULL) {
8245                                         if (asoc->primary_destination != net) {
8246                                                 continue;
8247                                         }
8248                                 } else {
8249                                         if (asoc->alternate != net) {
8250                                                 continue;
8251                                         }
8252                                 }
8253                         } else {
8254                                 if (chk->whoTo != net) {
8255                                         continue;
8256                                 }
8257                         }
8258         skip_net_check:
8259                         if (chk->data == NULL) {
8260                                 continue;
8261                         }
8262                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8263                                 /*
8264                                  * It must be unsent. Cookies and ASCONF's
8265                                  * hang around but there timers will force
8266                                  * when marked for resend.
8267                                  */
8268                                 continue;
8269                         }
8270                         /*
8271                          * if no AUTH is yet included and this chunk
8272                          * requires it, make sure to account for it.  We
8273                          * don't apply the size until the AUTH chunk is
8274                          * actually added below in case there is no room for
8275                          * this chunk. NOTE: we overload the use of "omtu"
8276                          * here
8277                          */
8278                         if ((auth == NULL) &&
8279                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8280                             stcb->asoc.peer_auth_chunks)) {
8281                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8282                         } else
8283                                 omtu = 0;
8284                         /* Here we do NOT factor the r_mtu */
8285                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8286                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8287                                 /*
8288                                  * We probably should glom the mbuf chain
8289                                  * from the chk->data for control but the
8290                                  * problem is it becomes yet one more level
8291                                  * of tracking to do if for some reason
8292                                  * output fails. Then I have got to
8293                                  * reconstruct the merged control chain.. el
8294                                  * yucko.. for now we take the easy way and
8295                                  * do the copy
8296                                  */
8297                                 /*
8298                                  * Add an AUTH chunk, if chunk requires it
8299                                  * save the offset into the chain for AUTH
8300                                  */
8301                                 if ((auth == NULL) &&
8302                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8303                                     stcb->asoc.peer_auth_chunks))) {
8304                                         outchain = sctp_add_auth_chunk(outchain,
8305                                             &endoutchain,
8306                                             &auth,
8307                                             &auth_offset,
8308                                             stcb,
8309                                             chk->rec.chunk_id.id);
8310                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8311                                 }
8312                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8313                                     (int)chk->rec.chunk_id.can_take_data,
8314                                     chk->send_size, chk->copy_by_ref);
8315                                 if (outchain == NULL) {
8316                                         *reason_code = 8;
8317                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8318                                         return (ENOMEM);
8319                                 }
8320                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8321                                 /* update our MTU size */
8322                                 if (mtu > (chk->send_size + omtu))
8323                                         mtu -= (chk->send_size + omtu);
8324                                 else
8325                                         mtu = 0;
8326                                 to_out += (chk->send_size + omtu);
8327                                 /* Do clear IP_DF ? */
8328                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8329                                         no_fragmentflg = 0;
8330                                 }
8331                                 if (chk->rec.chunk_id.can_take_data)
8332                                         chk->data = NULL;
8333                                 /* Mark things to be removed, if needed */
8334                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8335                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8336                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8337                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8338                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8339                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8340                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8341                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8342                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8343                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8344                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8345                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8346                                                 hbflag = 1;
8347                                         }
8348                                         /* remove these chunks at the end */
8349                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8350                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8351                                                 /* turn off the timer */
8352                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8353                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8354                                                             inp, stcb, NULL,
8355                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8356                                                 }
8357                                         }
8358                                         ctl_cnt++;
8359                                 } else {
8360                                         /*
8361                                          * Other chunks, since they have
8362                                          * timers running (i.e. COOKIE) we
8363                                          * just "trust" that it gets sent or
8364                                          * retransmitted.
8365                                          */
8366                                         ctl_cnt++;
8367                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8368                                                 cookie = 1;
8369                                                 no_out_cnt = 1;
8370                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8371                                                 /*
8372                                                  * Increment ecne send count
8373                                                  * here this means we may be
8374                                                  * over-zealous in our
8375                                                  * counting if the send
8376                                                  * fails, but its the best
8377                                                  * place to do it (we used
8378                                                  * to do it in the queue of
8379                                                  * the chunk, but that did
8380                                                  * not tell how many times
8381                                                  * it was sent.
8382                                                  */
8383                                                 SCTP_STAT_INCR(sctps_sendecne);
8384                                         }
8385                                         chk->sent = SCTP_DATAGRAM_SENT;
8386                                         if (chk->whoTo == NULL) {
8387                                                 chk->whoTo = net;
8388                                                 atomic_add_int(&net->ref_count, 1);
8389                                         }
8390                                         chk->snd_count++;
8391                                 }
8392                                 if (mtu == 0) {
8393                                         /*
8394                                          * Ok we are out of room but we can
8395                                          * output without effecting the
8396                                          * flight size since this little guy
8397                                          * is a control only packet.
8398                                          */
8399                                         if (asconf) {
8400                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8401                                                 /*
8402                                                  * do NOT clear the asconf
8403                                                  * flag as it is used to do
8404                                                  * appropriate source
8405                                                  * address selection.
8406                                                  */
8407                                         }
8408                                         if (cookie) {
8409                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8410                                                 cookie = 0;
8411                                         }
8412                                         /* Only HB or ASCONF advances time */
8413                                         if (hbflag) {
8414                                                 if (*now_filled == 0) {
8415                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8416                                                         *now_filled = 1;
8417                                                 }
8418                                                 net->last_sent_time = *now;
8419                                                 hbflag = 0;
8420                                         }
8421                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8422                                             (struct sockaddr *)&net->ro._l_addr,
8423                                             outchain,
8424                                             auth_offset, auth,
8425                                             stcb->asoc.authinfo.active_keyid,
8426                                             no_fragmentflg, 0, asconf,
8427                                             inp->sctp_lport, stcb->rport,
8428                                             htonl(stcb->asoc.peer_vtag),
8429                                             net->port, NULL,
8430                                             0, 0,
8431                                             so_locked))) {
8432                                                 /*
8433                                                  * error, we could not
8434                                                  * output
8435                                                  */
8436                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8437                                                 if (from_where == 0) {
8438                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8439                                                 }
8440                                                 if (error == ENOBUFS) {
8441                                                         asoc->ifp_had_enobuf = 1;
8442                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8443                                                 }
8444                                                 if (error == EHOSTUNREACH) {
8445                                                         /*
8446                                                          * Destination went
8447                                                          * unreachable
8448                                                          * during this send
8449                                                          */
8450                                                         sctp_move_chunks_from_net(stcb, net);
8451                                                 }
8452                                                 *reason_code = 7;
8453                                                 break;
8454                                         } else {
8455                                                 asoc->ifp_had_enobuf = 0;
8456                                         }
8457                                         /*
8458                                          * increase the number we sent, if a
8459                                          * cookie is sent we don't tell them
8460                                          * any was sent out.
8461                                          */
8462                                         outchain = endoutchain = NULL;
8463                                         auth = NULL;
8464                                         auth_offset = 0;
8465                                         if (!no_out_cnt)
8466                                                 *num_out += ctl_cnt;
8467                                         /* recalc a clean slate and setup */
8468                                         switch (net->ro._l_addr.sa.sa_family) {
8469 #ifdef INET
8470                                         case AF_INET:
8471                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8472                                                 break;
8473 #endif
8474 #ifdef INET6
8475                                         case AF_INET6:
8476                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8477                                                 break;
8478 #endif
8479                                         default:
8480                                                 /* TSNH */
8481                                                 mtu = net->mtu;
8482                                                 break;
8483                                         }
8484                                         to_out = 0;
8485                                         no_fragmentflg = 1;
8486                                 }
8487                         }
8488                 }
8489                 if (error != 0) {
8490                         /* try next net */
8491                         continue;
8492                 }
8493                 /* JRI: if dest is in PF state, do not send data to it */
8494                 if ((asoc->sctp_cmt_on_off > 0) &&
8495                     (net != stcb->asoc.alternate) &&
8496                     (net->dest_state & SCTP_ADDR_PF)) {
8497                         goto no_data_fill;
8498                 }
8499                 if (net->flight_size >= net->cwnd) {
8500                         goto no_data_fill;
8501                 }
8502                 if ((asoc->sctp_cmt_on_off > 0) &&
8503                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8504                     (net->flight_size > max_rwnd_per_dest)) {
8505                         goto no_data_fill;
8506                 }
8507                 /*
8508                  * We need a specific accounting for the usage of the send
8509                  * buffer. We also need to check the number of messages per
8510                  * net. For now, this is better than nothing and it disabled
8511                  * by default...
8512                  */
8513                 if ((asoc->sctp_cmt_on_off > 0) &&
8514                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8515                     (max_send_per_dest > 0) &&
8516                     (net->flight_size > max_send_per_dest)) {
8517                         goto no_data_fill;
8518                 }
8519                 /*********************/
8520                 /* Data transmission */
8521                 /*********************/
8522                 /*
8523                  * if AUTH for DATA is required and no AUTH has been added
8524                  * yet, account for this in the mtu now... if no data can be
8525                  * bundled, this adjustment won't matter anyways since the
8526                  * packet will be going out...
8527                  */
8528                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8529                     stcb->asoc.peer_auth_chunks);
8530                 if (data_auth_reqd && (auth == NULL)) {
8531                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8532                 }
8533                 /* now lets add any data within the MTU constraints */
8534                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8535 #ifdef INET
8536                 case AF_INET:
8537                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8538                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8539                         else
8540                                 omtu = 0;
8541                         break;
8542 #endif
8543 #ifdef INET6
8544                 case AF_INET6:
8545                         if (net->mtu > SCTP_MIN_OVERHEAD)
8546                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8547                         else
8548                                 omtu = 0;
8549                         break;
8550 #endif
8551                 default:
8552                         /* TSNH */
8553                         omtu = 0;
8554                         break;
8555                 }
8556                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8557                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8558                     (skip_data_for_this_net == 0)) ||
8559                     (cookie)) {
8560                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8561                                 if (no_data_chunks) {
8562                                         /* let only control go out */
8563                                         *reason_code = 1;
8564                                         break;
8565                                 }
8566                                 if (net->flight_size >= net->cwnd) {
8567                                         /* skip this net, no room for data */
8568                                         *reason_code = 2;
8569                                         break;
8570                                 }
8571                                 if ((chk->whoTo != NULL) &&
8572                                     (chk->whoTo != net)) {
8573                                         /* Don't send the chunk on this net */
8574                                         continue;
8575                                 }
8576
8577                                 if (asoc->sctp_cmt_on_off == 0) {
8578                                         if ((asoc->alternate) &&
8579                                             (asoc->alternate != net) &&
8580                                             (chk->whoTo == NULL)) {
8581                                                 continue;
8582                                         } else if ((net != asoc->primary_destination) &&
8583                                                     (asoc->alternate == NULL) &&
8584                                             (chk->whoTo == NULL)) {
8585                                                 continue;
8586                                         }
8587                                 }
8588                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8589                                         /*-
8590                                          * strange, we have a chunk that is
8591                                          * to big for its destination and
8592                                          * yet no fragment ok flag.
8593                                          * Something went wrong when the
8594                                          * PMTU changed...we did not mark
8595                                          * this chunk for some reason?? I
8596                                          * will fix it here by letting IP
8597                                          * fragment it for now and printing
8598                                          * a warning. This really should not
8599                                          * happen ...
8600                                          */
8601                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8602                                             chk->send_size, mtu);
8603                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8604                                 }
8605                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8606                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8607                                         struct sctp_data_chunk *dchkh;
8608
8609                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8610                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8611                                 }
8612                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8613                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8614                                         /* ok we will add this one */
8615
8616                                         /*
8617                                          * Add an AUTH chunk, if chunk
8618                                          * requires it, save the offset into
8619                                          * the chain for AUTH
8620                                          */
8621                                         if (data_auth_reqd) {
8622                                                 if (auth == NULL) {
8623                                                         outchain = sctp_add_auth_chunk(outchain,
8624                                                             &endoutchain,
8625                                                             &auth,
8626                                                             &auth_offset,
8627                                                             stcb,
8628                                                             SCTP_DATA);
8629                                                         auth_keyid = chk->auth_keyid;
8630                                                         override_ok = 0;
8631                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8632                                                 } else if (override_ok) {
8633                                                         /*
8634                                                          * use this data's
8635                                                          * keyid
8636                                                          */
8637                                                         auth_keyid = chk->auth_keyid;
8638                                                         override_ok = 0;
8639                                                 } else if (auth_keyid != chk->auth_keyid) {
8640                                                         /*
8641                                                          * different keyid,
8642                                                          * so done bundling
8643                                                          */
8644                                                         break;
8645                                                 }
8646                                         }
8647                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8648                                             chk->send_size, chk->copy_by_ref);
8649                                         if (outchain == NULL) {
8650                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8651                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8652                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8653                                                 }
8654                                                 *reason_code = 3;
8655                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8656                                                 return (ENOMEM);
8657                                         }
8658                                         /* upate our MTU size */
8659                                         /* Do clear IP_DF ? */
8660                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8661                                                 no_fragmentflg = 0;
8662                                         }
8663                                         /* unsigned subtraction of mtu */
8664                                         if (mtu > chk->send_size)
8665                                                 mtu -= chk->send_size;
8666                                         else
8667                                                 mtu = 0;
8668                                         /* unsigned subtraction of r_mtu */
8669                                         if (r_mtu > chk->send_size)
8670                                                 r_mtu -= chk->send_size;
8671                                         else
8672                                                 r_mtu = 0;
8673
8674                                         to_out += chk->send_size;
8675                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8676 #ifdef INVARIANTS
8677                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8678 #else
8679                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8680                                                     mx_mtu, to_out);
8681 #endif
8682                                         }
8683                                         chk->window_probe = 0;
8684                                         data_list[bundle_at++] = chk;
8685                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8686                                                 break;
8687                                         }
8688                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8689                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8690                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8691                                                 } else {
8692                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8693                                                 }
8694                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8695                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8696                                                         /*
8697                                                          * Count number of
8698                                                          * user msg's that
8699                                                          * were fragmented
8700                                                          * we do this by
8701                                                          * counting when we
8702                                                          * see a LAST
8703                                                          * fragment only.
8704                                                          */
8705                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8706                                         }
8707                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8708                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8709                                                         data_list[0]->window_probe = 1;
8710                                                         net->window_probe = 1;
8711                                                 }
8712                                                 break;
8713                                         }
8714                                 } else {
8715                                         /*
8716                                          * Must be sent in order of the
8717                                          * TSN's (on a network)
8718                                          */
8719                                         break;
8720                                 }
8721                         }       /* for (chunk gather loop for this net) */
8722                 }               /* if asoc.state OPEN */
8723 no_data_fill:
8724                 /* Is there something to send for this destination? */
8725                 if (outchain) {
8726                         /* We may need to start a control timer or two */
8727                         if (asconf) {
8728                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8729                                     stcb, net);
8730                                 /*
8731                                  * do NOT clear the asconf flag as it is
8732                                  * used to do appropriate source address
8733                                  * selection.
8734                                  */
8735                         }
8736                         if (cookie) {
8737                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8738                                 cookie = 0;
8739                         }
8740                         /* must start a send timer if data is being sent */
8741                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8742                                 /*
8743                                  * no timer running on this destination
8744                                  * restart it.
8745                                  */
8746                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8747                         }
8748                         if (bundle_at || hbflag) {
8749                                 /* For data/asconf and hb set time */
8750                                 if (*now_filled == 0) {
8751                                         (void)SCTP_GETTIME_TIMEVAL(now);
8752                                         *now_filled = 1;
8753                                 }
8754                                 net->last_sent_time = *now;
8755                         }
8756                         /* Now send it, if there is anything to send :> */
8757                         if ((error = sctp_lowlevel_chunk_output(inp,
8758                             stcb,
8759                             net,
8760                             (struct sockaddr *)&net->ro._l_addr,
8761                             outchain,
8762                             auth_offset,
8763                             auth,
8764                             auth_keyid,
8765                             no_fragmentflg,
8766                             bundle_at,
8767                             asconf,
8768                             inp->sctp_lport, stcb->rport,
8769                             htonl(stcb->asoc.peer_vtag),
8770                             net->port, NULL,
8771                             0, 0,
8772                             so_locked))) {
8773                                 /* error, we could not output */
8774                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8775                                 if (from_where == 0) {
8776                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8777                                 }
8778                                 if (error == ENOBUFS) {
8779                                         asoc->ifp_had_enobuf = 1;
8780                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8781                                 }
8782                                 if (error == EHOSTUNREACH) {
8783                                         /*
8784                                          * Destination went unreachable
8785                                          * during this send
8786                                          */
8787                                         sctp_move_chunks_from_net(stcb, net);
8788                                 }
8789                                 *reason_code = 6;
8790                                 /*-
8791                                  * I add this line to be paranoid. As far as
8792                                  * I can tell the continue, takes us back to
8793                                  * the top of the for, but just to make sure
8794                                  * I will reset these again here.
8795                                  */
8796                                 ctl_cnt = bundle_at = 0;
8797                                 continue;       /* This takes us back to the
8798                                                  * for() for the nets. */
8799                         } else {
8800                                 asoc->ifp_had_enobuf = 0;
8801                         }
8802                         endoutchain = NULL;
8803                         auth = NULL;
8804                         auth_offset = 0;
8805                         if (!no_out_cnt) {
8806                                 *num_out += (ctl_cnt + bundle_at);
8807                         }
8808                         if (bundle_at) {
8809                                 /* setup for a RTO measurement */
8810                                 tsns_sent = data_list[0]->rec.data.tsn;
8811                                 /* fill time if not already filled */
8812                                 if (*now_filled == 0) {
8813                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8814                                         *now_filled = 1;
8815                                         *now = asoc->time_last_sent;
8816                                 } else {
8817                                         asoc->time_last_sent = *now;
8818                                 }
8819                                 if (net->rto_needed) {
8820                                         data_list[0]->do_rtt = 1;
8821                                         net->rto_needed = 0;
8822                                 }
8823                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8824                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8825                         }
8826                         if (one_chunk) {
8827                                 break;
8828                         }
8829                 }
8830                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8831                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8832                 }
8833         }
8834         if (old_start_at == NULL) {
8835                 old_start_at = start_at;
8836                 start_at = TAILQ_FIRST(&asoc->nets);
8837                 if (old_start_at)
8838                         goto again_one_more_time;
8839         }
8840
8841         /*
8842          * At the end there should be no NON timed chunks hanging on this
8843          * queue.
8844          */
8845         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8846                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8847         }
8848         if ((*num_out == 0) && (*reason_code == 0)) {
8849                 *reason_code = 4;
8850         } else {
8851                 *reason_code = 5;
8852         }
8853         sctp_clean_up_ctl(stcb, asoc, so_locked);
8854         return (0);
8855 }
8856
8857 void
8858 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8859 {
8860         /*-
8861          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8862          * the control chunk queue.
8863          */
8864         struct sctp_chunkhdr *hdr;
8865         struct sctp_tmit_chunk *chk;
8866         struct mbuf *mat, *last_mbuf;
8867         uint32_t chunk_length;
8868         uint16_t padding_length;
8869
8870         SCTP_TCB_LOCK_ASSERT(stcb);
8871         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8872         if (op_err == NULL) {
8873                 return;
8874         }
8875         last_mbuf = NULL;
8876         chunk_length = 0;
8877         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8878                 chunk_length += SCTP_BUF_LEN(mat);
8879                 if (SCTP_BUF_NEXT(mat) == NULL) {
8880                         last_mbuf = mat;
8881                 }
8882         }
8883         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8884                 sctp_m_freem(op_err);
8885                 return;
8886         }
8887         padding_length = chunk_length % 4;
8888         if (padding_length != 0) {
8889                 padding_length = 4 - padding_length;
8890         }
8891         if (padding_length != 0) {
8892                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8893                         sctp_m_freem(op_err);
8894                         return;
8895                 }
8896         }
8897         sctp_alloc_a_chunk(stcb, chk);
8898         if (chk == NULL) {
8899                 /* no memory */
8900                 sctp_m_freem(op_err);
8901                 return;
8902         }
8903         chk->copy_by_ref = 0;
8904         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8905         chk->rec.chunk_id.can_take_data = 0;
8906         chk->flags = 0;
8907         chk->send_size = (uint16_t)chunk_length;
8908         chk->sent = SCTP_DATAGRAM_UNSENT;
8909         chk->snd_count = 0;
8910         chk->asoc = &stcb->asoc;
8911         chk->data = op_err;
8912         chk->whoTo = NULL;
8913         hdr = mtod(op_err, struct sctp_chunkhdr *);
8914         hdr->chunk_type = SCTP_OPERATION_ERROR;
8915         hdr->chunk_flags = 0;
8916         hdr->chunk_length = htons(chk->send_size);
8917         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8918         chk->asoc->ctrl_queue_cnt++;
8919 }
8920
8921 int
8922 sctp_send_cookie_echo(struct mbuf *m,
8923     int offset, int limit,
8924     struct sctp_tcb *stcb,
8925     struct sctp_nets *net)
8926 {
8927         /*-
8928          * pull out the cookie and put it at the front of the control chunk
8929          * queue.
8930          */
8931         int at;
8932         struct mbuf *cookie;
8933         struct sctp_paramhdr param, *phdr;
8934         struct sctp_chunkhdr *hdr;
8935         struct sctp_tmit_chunk *chk;
8936         uint16_t ptype, plen;
8937
8938         SCTP_TCB_LOCK_ASSERT(stcb);
8939         /* First find the cookie in the param area */
8940         cookie = NULL;
8941         at = offset + sizeof(struct sctp_init_chunk);
8942         for (;;) {
8943                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8944                 if (phdr == NULL) {
8945                         return (-3);
8946                 }
8947                 ptype = ntohs(phdr->param_type);
8948                 plen = ntohs(phdr->param_length);
8949                 if (plen < sizeof(struct sctp_paramhdr)) {
8950                         return (-6);
8951                 }
8952                 if (ptype == SCTP_STATE_COOKIE) {
8953                         int pad;
8954
8955                         /* found the cookie */
8956                         if (at + plen > limit) {
8957                                 return (-7);
8958                         }
8959                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8960                         if (cookie == NULL) {
8961                                 /* No memory */
8962                                 return (-2);
8963                         }
8964                         if ((pad = (plen % 4)) > 0) {
8965                                 pad = 4 - pad;
8966                         }
8967                         if (pad > 0) {
8968                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
8969                                         return (-8);
8970                                 }
8971                         }
8972 #ifdef SCTP_MBUF_LOGGING
8973                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8974                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
8975                         }
8976 #endif
8977                         break;
8978                 }
8979                 at += SCTP_SIZE32(plen);
8980         }
8981         /* ok, we got the cookie lets change it into a cookie echo chunk */
8982         /* first the change from param to cookie */
8983         hdr = mtod(cookie, struct sctp_chunkhdr *);
8984         hdr->chunk_type = SCTP_COOKIE_ECHO;
8985         hdr->chunk_flags = 0;
8986         /* get the chunk stuff now and place it in the FRONT of the queue */
8987         sctp_alloc_a_chunk(stcb, chk);
8988         if (chk == NULL) {
8989                 /* no memory */
8990                 sctp_m_freem(cookie);
8991                 return (-5);
8992         }
8993         chk->copy_by_ref = 0;
8994         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8995         chk->rec.chunk_id.can_take_data = 0;
8996         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8997         chk->send_size = SCTP_SIZE32(plen);
8998         chk->sent = SCTP_DATAGRAM_UNSENT;
8999         chk->snd_count = 0;
9000         chk->asoc = &stcb->asoc;
9001         chk->data = cookie;
9002         chk->whoTo = net;
9003         atomic_add_int(&chk->whoTo->ref_count, 1);
9004         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9005         chk->asoc->ctrl_queue_cnt++;
9006         return (0);
9007 }
9008
9009 void
9010 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9011     struct mbuf *m,
9012     int offset,
9013     int chk_length,
9014     struct sctp_nets *net)
9015 {
9016         /*
9017          * take a HB request and make it into a HB ack and send it.
9018          */
9019         struct mbuf *outchain;
9020         struct sctp_chunkhdr *chdr;
9021         struct sctp_tmit_chunk *chk;
9022
9023         if (net == NULL)
9024                 /* must have a net pointer */
9025                 return;
9026
9027         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9028         if (outchain == NULL) {
9029                 /* gak out of memory */
9030                 return;
9031         }
9032 #ifdef SCTP_MBUF_LOGGING
9033         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9034                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9035         }
9036 #endif
9037         chdr = mtod(outchain, struct sctp_chunkhdr *);
9038         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9039         chdr->chunk_flags = 0;
9040         if (chk_length % 4 != 0) {
9041                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9042         }
9043         sctp_alloc_a_chunk(stcb, chk);
9044         if (chk == NULL) {
9045                 /* no memory */
9046                 sctp_m_freem(outchain);
9047                 return;
9048         }
9049         chk->copy_by_ref = 0;
9050         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9051         chk->rec.chunk_id.can_take_data = 1;
9052         chk->flags = 0;
9053         chk->send_size = chk_length;
9054         chk->sent = SCTP_DATAGRAM_UNSENT;
9055         chk->snd_count = 0;
9056         chk->asoc = &stcb->asoc;
9057         chk->data = outchain;
9058         chk->whoTo = net;
9059         atomic_add_int(&chk->whoTo->ref_count, 1);
9060         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9061         chk->asoc->ctrl_queue_cnt++;
9062 }
9063
9064 void
9065 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9066 {
9067         /* formulate and queue a cookie-ack back to sender */
9068         struct mbuf *cookie_ack;
9069         struct sctp_chunkhdr *hdr;
9070         struct sctp_tmit_chunk *chk;
9071
9072         SCTP_TCB_LOCK_ASSERT(stcb);
9073
9074         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9075         if (cookie_ack == NULL) {
9076                 /* no mbuf's */
9077                 return;
9078         }
9079         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9080         sctp_alloc_a_chunk(stcb, chk);
9081         if (chk == NULL) {
9082                 /* no memory */
9083                 sctp_m_freem(cookie_ack);
9084                 return;
9085         }
9086         chk->copy_by_ref = 0;
9087         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9088         chk->rec.chunk_id.can_take_data = 1;
9089         chk->flags = 0;
9090         chk->send_size = sizeof(struct sctp_chunkhdr);
9091         chk->sent = SCTP_DATAGRAM_UNSENT;
9092         chk->snd_count = 0;
9093         chk->asoc = &stcb->asoc;
9094         chk->data = cookie_ack;
9095         if (chk->asoc->last_control_chunk_from != NULL) {
9096                 chk->whoTo = chk->asoc->last_control_chunk_from;
9097                 atomic_add_int(&chk->whoTo->ref_count, 1);
9098         } else {
9099                 chk->whoTo = NULL;
9100         }
9101         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9102         hdr->chunk_type = SCTP_COOKIE_ACK;
9103         hdr->chunk_flags = 0;
9104         hdr->chunk_length = htons(chk->send_size);
9105         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9106         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9107         chk->asoc->ctrl_queue_cnt++;
9108         return;
9109 }
9110
9111 void
9112 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9113 {
9114         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9115         struct mbuf *m_shutdown_ack;
9116         struct sctp_shutdown_ack_chunk *ack_cp;
9117         struct sctp_tmit_chunk *chk;
9118
9119         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9120         if (m_shutdown_ack == NULL) {
9121                 /* no mbuf's */
9122                 return;
9123         }
9124         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9125         sctp_alloc_a_chunk(stcb, chk);
9126         if (chk == NULL) {
9127                 /* no memory */
9128                 sctp_m_freem(m_shutdown_ack);
9129                 return;
9130         }
9131         chk->copy_by_ref = 0;
9132         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9133         chk->rec.chunk_id.can_take_data = 1;
9134         chk->flags = 0;
9135         chk->send_size = sizeof(struct sctp_chunkhdr);
9136         chk->sent = SCTP_DATAGRAM_UNSENT;
9137         chk->snd_count = 0;
9138         chk->asoc = &stcb->asoc;
9139         chk->data = m_shutdown_ack;
9140         chk->whoTo = net;
9141         if (chk->whoTo) {
9142                 atomic_add_int(&chk->whoTo->ref_count, 1);
9143         }
9144         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9145         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9146         ack_cp->ch.chunk_flags = 0;
9147         ack_cp->ch.chunk_length = htons(chk->send_size);
9148         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9149         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9150         chk->asoc->ctrl_queue_cnt++;
9151         return;
9152 }
9153
9154 void
9155 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9156 {
9157         /* formulate and queue a SHUTDOWN to the sender */
9158         struct mbuf *m_shutdown;
9159         struct sctp_shutdown_chunk *shutdown_cp;
9160         struct sctp_tmit_chunk *chk;
9161
9162         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9163                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9164                         /* We already have a SHUTDOWN queued. Reuse it. */
9165                         if (chk->whoTo) {
9166                                 sctp_free_remote_addr(chk->whoTo);
9167                                 chk->whoTo = NULL;
9168                         }
9169                         break;
9170                 }
9171         }
9172         if (chk == NULL) {
9173                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9174                 if (m_shutdown == NULL) {
9175                         /* no mbuf's */
9176                         return;
9177                 }
9178                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9179                 sctp_alloc_a_chunk(stcb, chk);
9180                 if (chk == NULL) {
9181                         /* no memory */
9182                         sctp_m_freem(m_shutdown);
9183                         return;
9184                 }
9185                 chk->copy_by_ref = 0;
9186                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9187                 chk->rec.chunk_id.can_take_data = 1;
9188                 chk->flags = 0;
9189                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9190                 chk->sent = SCTP_DATAGRAM_UNSENT;
9191                 chk->snd_count = 0;
9192                 chk->asoc = &stcb->asoc;
9193                 chk->data = m_shutdown;
9194                 chk->whoTo = net;
9195                 if (chk->whoTo) {
9196                         atomic_add_int(&chk->whoTo->ref_count, 1);
9197                 }
9198                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9199                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9200                 shutdown_cp->ch.chunk_flags = 0;
9201                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9202                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9203                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9204                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9205                 chk->asoc->ctrl_queue_cnt++;
9206         } else {
9207                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9208                 chk->whoTo = net;
9209                 if (chk->whoTo) {
9210                         atomic_add_int(&chk->whoTo->ref_count, 1);
9211                 }
9212                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9213                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9214                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9215         }
9216         return;
9217 }
9218
9219 void
9220 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9221 {
9222         /*
9223          * formulate and queue an ASCONF to the peer. ASCONF parameters
9224          * should be queued on the assoc queue.
9225          */
9226         struct sctp_tmit_chunk *chk;
9227         struct mbuf *m_asconf;
9228         int len;
9229
9230         SCTP_TCB_LOCK_ASSERT(stcb);
9231
9232         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9233             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9234                 /* can't send a new one if there is one in flight already */
9235                 return;
9236         }
9237
9238         /* compose an ASCONF chunk, maximum length is PMTU */
9239         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9240         if (m_asconf == NULL) {
9241                 return;
9242         }
9243
9244         sctp_alloc_a_chunk(stcb, chk);
9245         if (chk == NULL) {
9246                 /* no memory */
9247                 sctp_m_freem(m_asconf);
9248                 return;
9249         }
9250
9251         chk->copy_by_ref = 0;
9252         chk->rec.chunk_id.id = SCTP_ASCONF;
9253         chk->rec.chunk_id.can_take_data = 0;
9254         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9255         chk->data = m_asconf;
9256         chk->send_size = len;
9257         chk->sent = SCTP_DATAGRAM_UNSENT;
9258         chk->snd_count = 0;
9259         chk->asoc = &stcb->asoc;
9260         chk->whoTo = net;
9261         if (chk->whoTo) {
9262                 atomic_add_int(&chk->whoTo->ref_count, 1);
9263         }
9264         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9265         chk->asoc->ctrl_queue_cnt++;
9266         return;
9267 }
9268
9269 void
9270 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9271 {
9272         /*
9273          * formulate and queue a asconf-ack back to sender. the asconf-ack
9274          * must be stored in the tcb.
9275          */
9276         struct sctp_tmit_chunk *chk;
9277         struct sctp_asconf_ack *ack, *latest_ack;
9278         struct mbuf *m_ack;
9279         struct sctp_nets *net = NULL;
9280
9281         SCTP_TCB_LOCK_ASSERT(stcb);
9282         /* Get the latest ASCONF-ACK */
9283         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9284         if (latest_ack == NULL) {
9285                 return;
9286         }
9287         if (latest_ack->last_sent_to != NULL &&
9288             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9289                 /* we're doing a retransmission */
9290                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9291                 if (net == NULL) {
9292                         /* no alternate */
9293                         if (stcb->asoc.last_control_chunk_from == NULL) {
9294                                 if (stcb->asoc.alternate) {
9295                                         net = stcb->asoc.alternate;
9296                                 } else {
9297                                         net = stcb->asoc.primary_destination;
9298                                 }
9299                         } else {
9300                                 net = stcb->asoc.last_control_chunk_from;
9301                         }
9302                 }
9303         } else {
9304                 /* normal case */
9305                 if (stcb->asoc.last_control_chunk_from == NULL) {
9306                         if (stcb->asoc.alternate) {
9307                                 net = stcb->asoc.alternate;
9308                         } else {
9309                                 net = stcb->asoc.primary_destination;
9310                         }
9311                 } else {
9312                         net = stcb->asoc.last_control_chunk_from;
9313                 }
9314         }
9315         latest_ack->last_sent_to = net;
9316
9317         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9318                 if (ack->data == NULL) {
9319                         continue;
9320                 }
9321
9322                 /* copy the asconf_ack */
9323                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9324                 if (m_ack == NULL) {
9325                         /* couldn't copy it */
9326                         return;
9327                 }
9328 #ifdef SCTP_MBUF_LOGGING
9329                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9330                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9331                 }
9332 #endif
9333
9334                 sctp_alloc_a_chunk(stcb, chk);
9335                 if (chk == NULL) {
9336                         /* no memory */
9337                         if (m_ack)
9338                                 sctp_m_freem(m_ack);
9339                         return;
9340                 }
9341                 chk->copy_by_ref = 0;
9342                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9343                 chk->rec.chunk_id.can_take_data = 1;
9344                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9345                 chk->whoTo = net;
9346                 if (chk->whoTo) {
9347                         atomic_add_int(&chk->whoTo->ref_count, 1);
9348                 }
9349                 chk->data = m_ack;
9350                 chk->send_size = ack->len;
9351                 chk->sent = SCTP_DATAGRAM_UNSENT;
9352                 chk->snd_count = 0;
9353                 chk->asoc = &stcb->asoc;
9354
9355                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9356                 chk->asoc->ctrl_queue_cnt++;
9357         }
9358         return;
9359 }
9360
9361 static int
9362 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9363     struct sctp_tcb *stcb,
9364     struct sctp_association *asoc,
9365     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
9366 {
9367         /*-
9368          * send out one MTU of retransmission. If fast_retransmit is
9369          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9370          * rwnd. For a Cookie or Asconf in the control chunk queue we
9371          * retransmit them by themselves.
9372          *
9373          * For data chunks we will pick out the lowest TSN's in the sent_queue
9374          * marked for resend and bundle them all together (up to a MTU of
9375          * destination). The address to send to should have been
9376          * selected/changed where the retransmission was marked (i.e. in FR
9377          * or t3-timeout routines).
9378          */
9379         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9380         struct sctp_tmit_chunk *chk, *fwd;
9381         struct mbuf *m, *endofchain;
9382         struct sctp_nets *net = NULL;
9383         uint32_t tsns_sent = 0;
9384         int no_fragmentflg, bundle_at, cnt_thru;
9385         unsigned int mtu;
9386         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9387         struct sctp_auth_chunk *auth = NULL;
9388         uint32_t auth_offset = 0;
9389         uint16_t auth_keyid;
9390         int override_ok = 1;
9391         int data_auth_reqd = 0;
9392         uint32_t dmtu = 0;
9393
9394         SCTP_TCB_LOCK_ASSERT(stcb);
9395         tmr_started = ctl_cnt = bundle_at = error = 0;
9396         no_fragmentflg = 1;
9397         fwd_tsn = 0;
9398         *cnt_out = 0;
9399         fwd = NULL;
9400         endofchain = m = NULL;
9401         auth_keyid = stcb->asoc.authinfo.active_keyid;
9402 #ifdef SCTP_AUDITING_ENABLED
9403         sctp_audit_log(0xC3, 1);
9404 #endif
9405         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9406             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9407                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9408                     asoc->sent_queue_retran_cnt);
9409                 asoc->sent_queue_cnt = 0;
9410                 asoc->sent_queue_cnt_removeable = 0;
9411                 /* send back 0/0 so we enter normal transmission */
9412                 *cnt_out = 0;
9413                 return (0);
9414         }
9415         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9416                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9417                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9418                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9419                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9420                                 continue;
9421                         }
9422                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9423                                 if (chk != asoc->str_reset) {
9424                                         /*
9425                                          * not eligible for retran if its
9426                                          * not ours
9427                                          */
9428                                         continue;
9429                                 }
9430                         }
9431                         ctl_cnt++;
9432                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9433                                 fwd_tsn = 1;
9434                         }
9435                         /*
9436                          * Add an AUTH chunk, if chunk requires it save the
9437                          * offset into the chain for AUTH
9438                          */
9439                         if ((auth == NULL) &&
9440                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9441                             stcb->asoc.peer_auth_chunks))) {
9442                                 m = sctp_add_auth_chunk(m, &endofchain,
9443                                     &auth, &auth_offset,
9444                                     stcb,
9445                                     chk->rec.chunk_id.id);
9446                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9447                         }
9448                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9449                         break;
9450                 }
9451         }
9452         one_chunk = 0;
9453         cnt_thru = 0;
9454         /* do we have control chunks to retransmit? */
9455         if (m != NULL) {
9456                 /* Start a timer no matter if we succeed or fail */
9457                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9458                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9459                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9460                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9461                 chk->snd_count++;       /* update our count */
9462                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9463                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9464                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9465                     no_fragmentflg, 0, 0,
9466                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9467                     chk->whoTo->port, NULL,
9468                     0, 0,
9469                     so_locked))) {
9470                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9471                         if (error == ENOBUFS) {
9472                                 asoc->ifp_had_enobuf = 1;
9473                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9474                         }
9475                         return (error);
9476                 } else {
9477                         asoc->ifp_had_enobuf = 0;
9478                 }
9479                 endofchain = NULL;
9480                 auth = NULL;
9481                 auth_offset = 0;
9482                 /*
9483                  * We don't want to mark the net->sent time here since this
9484                  * we use this for HB and retrans cannot measure RTT
9485                  */
9486                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9487                 *cnt_out += 1;
9488                 chk->sent = SCTP_DATAGRAM_SENT;
9489                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9490                 if (fwd_tsn == 0) {
9491                         return (0);
9492                 } else {
9493                         /* Clean up the fwd-tsn list */
9494                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9495                         return (0);
9496                 }
9497         }
9498         /*
9499          * Ok, it is just data retransmission we need to do or that and a
9500          * fwd-tsn with it all.
9501          */
9502         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9503                 return (SCTP_RETRAN_DONE);
9504         }
9505         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9506             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9507                 /* not yet open, resend the cookie and that is it */
9508                 return (1);
9509         }
9510 #ifdef SCTP_AUDITING_ENABLED
9511         sctp_auditing(20, inp, stcb, NULL);
9512 #endif
9513         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9514         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9515                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9516                         /* No, not sent to this net or not ready for rtx */
9517                         continue;
9518                 }
9519                 if (chk->data == NULL) {
9520                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9521                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9522                         continue;
9523                 }
9524                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9525                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9526                         struct mbuf *op_err;
9527                         char msg[SCTP_DIAG_INFO_LEN];
9528
9529                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9530                             chk->rec.data.tsn, chk->snd_count);
9531                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9532                             msg);
9533                         atomic_add_int(&stcb->asoc.refcnt, 1);
9534                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9535                             so_locked);
9536                         SCTP_TCB_LOCK(stcb);
9537                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9538                         return (SCTP_RETRAN_EXIT);
9539                 }
9540                 /* pick up the net */
9541                 net = chk->whoTo;
9542                 switch (net->ro._l_addr.sa.sa_family) {
9543 #ifdef INET
9544                 case AF_INET:
9545                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9546                         break;
9547 #endif
9548 #ifdef INET6
9549                 case AF_INET6:
9550                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9551                         break;
9552 #endif
9553                 default:
9554                         /* TSNH */
9555                         mtu = net->mtu;
9556                         break;
9557                 }
9558
9559                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9560                         /* No room in peers rwnd */
9561                         uint32_t tsn;
9562
9563                         tsn = asoc->last_acked_seq + 1;
9564                         if (tsn == chk->rec.data.tsn) {
9565                                 /*
9566                                  * we make a special exception for this
9567                                  * case. The peer has no rwnd but is missing
9568                                  * the lowest chunk.. which is probably what
9569                                  * is holding up the rwnd.
9570                                  */
9571                                 goto one_chunk_around;
9572                         }
9573                         return (1);
9574                 }
9575 one_chunk_around:
9576                 if (asoc->peers_rwnd < mtu) {
9577                         one_chunk = 1;
9578                         if ((asoc->peers_rwnd == 0) &&
9579                             (asoc->total_flight == 0)) {
9580                                 chk->window_probe = 1;
9581                                 chk->whoTo->window_probe = 1;
9582                         }
9583                 }
9584 #ifdef SCTP_AUDITING_ENABLED
9585                 sctp_audit_log(0xC3, 2);
9586 #endif
9587                 bundle_at = 0;
9588                 m = NULL;
9589                 net->fast_retran_ip = 0;
9590                 if (chk->rec.data.doing_fast_retransmit == 0) {
9591                         /*
9592                          * if no FR in progress skip destination that have
9593                          * flight_size > cwnd.
9594                          */
9595                         if (net->flight_size >= net->cwnd) {
9596                                 continue;
9597                         }
9598                 } else {
9599                         /*
9600                          * Mark the destination net to have FR recovery
9601                          * limits put on it.
9602                          */
9603                         *fr_done = 1;
9604                         net->fast_retran_ip = 1;
9605                 }
9606
9607                 /*
9608                  * if no AUTH is yet included and this chunk requires it,
9609                  * make sure to account for it.  We don't apply the size
9610                  * until the AUTH chunk is actually added below in case
9611                  * there is no room for this chunk.
9612                  */
9613                 if (data_auth_reqd && (auth == NULL)) {
9614                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9615                 } else
9616                         dmtu = 0;
9617
9618                 if ((chk->send_size <= (mtu - dmtu)) ||
9619                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9620                         /* ok we will add this one */
9621                         if (data_auth_reqd) {
9622                                 if (auth == NULL) {
9623                                         m = sctp_add_auth_chunk(m,
9624                                             &endofchain,
9625                                             &auth,
9626                                             &auth_offset,
9627                                             stcb,
9628                                             SCTP_DATA);
9629                                         auth_keyid = chk->auth_keyid;
9630                                         override_ok = 0;
9631                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9632                                 } else if (override_ok) {
9633                                         auth_keyid = chk->auth_keyid;
9634                                         override_ok = 0;
9635                                 } else if (chk->auth_keyid != auth_keyid) {
9636                                         /* different keyid, so done bundling */
9637                                         break;
9638                                 }
9639                         }
9640                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9641                         if (m == NULL) {
9642                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9643                                 return (ENOMEM);
9644                         }
9645                         /* Do clear IP_DF ? */
9646                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9647                                 no_fragmentflg = 0;
9648                         }
9649                         /* upate our MTU size */
9650                         if (mtu > (chk->send_size + dmtu))
9651                                 mtu -= (chk->send_size + dmtu);
9652                         else
9653                                 mtu = 0;
9654                         data_list[bundle_at++] = chk;
9655                         if (one_chunk && (asoc->total_flight <= 0)) {
9656                                 SCTP_STAT_INCR(sctps_windowprobed);
9657                         }
9658                 }
9659                 if (one_chunk == 0) {
9660                         /*
9661                          * now are there anymore forward from chk to pick
9662                          * up?
9663                          */
9664                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9665                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9666                                         /* Nope, not for retran */
9667                                         continue;
9668                                 }
9669                                 if (fwd->whoTo != net) {
9670                                         /* Nope, not the net in question */
9671                                         continue;
9672                                 }
9673                                 if (data_auth_reqd && (auth == NULL)) {
9674                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9675                                 } else
9676                                         dmtu = 0;
9677                                 if (fwd->send_size <= (mtu - dmtu)) {
9678                                         if (data_auth_reqd) {
9679                                                 if (auth == NULL) {
9680                                                         m = sctp_add_auth_chunk(m,
9681                                                             &endofchain,
9682                                                             &auth,
9683                                                             &auth_offset,
9684                                                             stcb,
9685                                                             SCTP_DATA);
9686                                                         auth_keyid = fwd->auth_keyid;
9687                                                         override_ok = 0;
9688                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9689                                                 } else if (override_ok) {
9690                                                         auth_keyid = fwd->auth_keyid;
9691                                                         override_ok = 0;
9692                                                 } else if (fwd->auth_keyid != auth_keyid) {
9693                                                         /*
9694                                                          * different keyid,
9695                                                          * so done bundling
9696                                                          */
9697                                                         break;
9698                                                 }
9699                                         }
9700                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9701                                         if (m == NULL) {
9702                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9703                                                 return (ENOMEM);
9704                                         }
9705                                         /* Do clear IP_DF ? */
9706                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9707                                                 no_fragmentflg = 0;
9708                                         }
9709                                         /* upate our MTU size */
9710                                         if (mtu > (fwd->send_size + dmtu))
9711                                                 mtu -= (fwd->send_size + dmtu);
9712                                         else
9713                                                 mtu = 0;
9714                                         data_list[bundle_at++] = fwd;
9715                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9716                                                 break;
9717                                         }
9718                                 } else {
9719                                         /* can't fit so we are done */
9720                                         break;
9721                                 }
9722                         }
9723                 }
9724                 /* Is there something to send for this destination? */
9725                 if (m) {
9726                         /*
9727                          * No matter if we fail/or succeed we should start a
9728                          * timer. A failure is like a lost IP packet :-)
9729                          */
9730                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9731                                 /*
9732                                  * no timer running on this destination
9733                                  * restart it.
9734                                  */
9735                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9736                                 tmr_started = 1;
9737                         }
9738                         /* Now lets send it, if there is anything to send :> */
9739                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9740                             (struct sockaddr *)&net->ro._l_addr, m,
9741                             auth_offset, auth, auth_keyid,
9742                             no_fragmentflg, 0, 0,
9743                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9744                             net->port, NULL,
9745                             0, 0,
9746                             so_locked))) {
9747                                 /* error, we could not output */
9748                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9749                                 if (error == ENOBUFS) {
9750                                         asoc->ifp_had_enobuf = 1;
9751                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9752                                 }
9753                                 return (error);
9754                         } else {
9755                                 asoc->ifp_had_enobuf = 0;
9756                         }
9757                         endofchain = NULL;
9758                         auth = NULL;
9759                         auth_offset = 0;
9760                         /* For HB's */
9761                         /*
9762                          * We don't want to mark the net->sent time here
9763                          * since this we use this for HB and retrans cannot
9764                          * measure RTT
9765                          */
9766                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9767
9768                         /* For auto-close */
9769                         cnt_thru++;
9770                         if (*now_filled == 0) {
9771                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9772                                 *now = asoc->time_last_sent;
9773                                 *now_filled = 1;
9774                         } else {
9775                                 asoc->time_last_sent = *now;
9776                         }
9777                         *cnt_out += bundle_at;
9778 #ifdef SCTP_AUDITING_ENABLED
9779                         sctp_audit_log(0xC4, bundle_at);
9780 #endif
9781                         if (bundle_at) {
9782                                 tsns_sent = data_list[0]->rec.data.tsn;
9783                         }
9784                         for (i = 0; i < bundle_at; i++) {
9785                                 SCTP_STAT_INCR(sctps_sendretransdata);
9786                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9787                                 /*
9788                                  * When we have a revoked data, and we
9789                                  * retransmit it, then we clear the revoked
9790                                  * flag since this flag dictates if we
9791                                  * subtracted from the fs
9792                                  */
9793                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9794                                         /* Deflate the cwnd */
9795                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9796                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9797                                 }
9798                                 data_list[i]->snd_count++;
9799                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9800                                 /* record the time */
9801                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9802                                 if (data_list[i]->book_size_scale) {
9803                                         /*
9804                                          * need to double the book size on
9805                                          * this one
9806                                          */
9807                                         data_list[i]->book_size_scale = 0;
9808                                         /*
9809                                          * Since we double the booksize, we
9810                                          * must also double the output queue
9811                                          * size, since this get shrunk when
9812                                          * we free by this amount.
9813                                          */
9814                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9815                                         data_list[i]->book_size *= 2;
9816
9817                                 } else {
9818                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9819                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9820                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9821                                         }
9822                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9823                                             (uint32_t)(data_list[i]->send_size +
9824                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9825                                 }
9826                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9827                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9828                                             data_list[i]->whoTo->flight_size,
9829                                             data_list[i]->book_size,
9830                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9831                                             data_list[i]->rec.data.tsn);
9832                                 }
9833                                 sctp_flight_size_increase(data_list[i]);
9834                                 sctp_total_flight_increase(stcb, data_list[i]);
9835                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9836                                         /* SWS sender side engages */
9837                                         asoc->peers_rwnd = 0;
9838                                 }
9839                                 if ((i == 0) &&
9840                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9841                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9842                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9843                                             (tmr_started == 0)) {
9844                                                 /*-
9845                                                  * ok we just fast-retrans'd
9846                                                  * the lowest TSN, i.e the
9847                                                  * first on the list. In
9848                                                  * this case we want to give
9849                                                  * some more time to get a
9850                                                  * SACK back without a
9851                                                  * t3-expiring.
9852                                                  */
9853                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9854                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9855                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9856                                         }
9857                                 }
9858                         }
9859                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9860                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9861                         }
9862 #ifdef SCTP_AUDITING_ENABLED
9863                         sctp_auditing(21, inp, stcb, NULL);
9864 #endif
9865                 } else {
9866                         /* None will fit */
9867                         return (1);
9868                 }
9869                 if (asoc->sent_queue_retran_cnt <= 0) {
9870                         /* all done we have no more to retran */
9871                         asoc->sent_queue_retran_cnt = 0;
9872                         break;
9873                 }
9874                 if (one_chunk) {
9875                         /* No more room in rwnd */
9876                         return (1);
9877                 }
9878                 /* stop the for loop here. we sent out a packet */
9879                 break;
9880         }
9881         return (0);
9882 }
9883
9884 static void
9885 sctp_timer_validation(struct sctp_inpcb *inp,
9886     struct sctp_tcb *stcb,
9887     struct sctp_association *asoc)
9888 {
9889         struct sctp_nets *net;
9890
9891         /* Validate that a timer is running somewhere */
9892         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9893                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9894                         /* Here is a timer */
9895                         return;
9896                 }
9897         }
9898         SCTP_TCB_LOCK_ASSERT(stcb);
9899         /* Gak, we did not have a timer somewhere */
9900         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9901         if (asoc->alternate) {
9902                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9903         } else {
9904                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9905         }
9906         return;
9907 }
9908
9909 void
9910 sctp_chunk_output(struct sctp_inpcb *inp,
9911     struct sctp_tcb *stcb,
9912     int from_where,
9913     int so_locked)
9914 {
9915         /*-
9916          * Ok this is the generic chunk service queue. we must do the
9917          * following:
9918          * - See if there are retransmits pending, if so we must
9919          *   do these first.
9920          * - Service the stream queue that is next, moving any
9921          *   message (note I must get a complete message i.e.
9922          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9923          *   TSN's
9924          * - Check to see if the cwnd/rwnd allows any output, if so we
9925          *   go ahead and fomulate and send the low level chunks. Making sure
9926          *   to combine any control in the control chunk queue also.
9927          */
9928         struct sctp_association *asoc;
9929         struct sctp_nets *net;
9930         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9931         unsigned int burst_cnt = 0;
9932         struct timeval now;
9933         int now_filled = 0;
9934         int nagle_on;
9935         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9936         int un_sent = 0;
9937         int fr_done;
9938         unsigned int tot_frs = 0;
9939
9940         asoc = &stcb->asoc;
9941 do_it_again:
9942         /* The Nagle algorithm is only applied when handling a send call. */
9943         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9944                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9945                         nagle_on = 0;
9946                 } else {
9947                         nagle_on = 1;
9948                 }
9949         } else {
9950                 nagle_on = 0;
9951         }
9952         SCTP_TCB_LOCK_ASSERT(stcb);
9953
9954         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9955
9956         if ((un_sent <= 0) &&
9957             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9958             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9959             (asoc->sent_queue_retran_cnt == 0) &&
9960             (asoc->trigger_reset == 0)) {
9961                 /* Nothing to do unless there is something to be sent left */
9962                 return;
9963         }
9964         /*
9965          * Do we have something to send, data or control AND a sack timer
9966          * running, if so piggy-back the sack.
9967          */
9968         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9969                 sctp_send_sack(stcb, so_locked);
9970                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
9971                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
9972         }
9973         while (asoc->sent_queue_retran_cnt) {
9974                 /*-
9975                  * Ok, it is retransmission time only, we send out only ONE
9976                  * packet with a single call off to the retran code.
9977                  */
9978                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9979                         /*-
9980                          * Special hook for handling cookiess discarded
9981                          * by peer that carried data. Send cookie-ack only
9982                          * and then the next call with get the retran's.
9983                          */
9984                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9985                             from_where,
9986                             &now, &now_filled, frag_point, so_locked);
9987                         return;
9988                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9989                         /* if its not from a HB then do it */
9990                         fr_done = 0;
9991                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9992                         if (fr_done) {
9993                                 tot_frs++;
9994                         }
9995                 } else {
9996                         /*
9997                          * its from any other place, we don't allow retran
9998                          * output (only control)
9999                          */
10000                         ret = 1;
10001                 }
10002                 if (ret > 0) {
10003                         /* Can't send anymore */
10004                         /*-
10005                          * now lets push out control by calling med-level
10006                          * output once. this assures that we WILL send HB's
10007                          * if queued too.
10008                          */
10009                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10010                             from_where,
10011                             &now, &now_filled, frag_point, so_locked);
10012 #ifdef SCTP_AUDITING_ENABLED
10013                         sctp_auditing(8, inp, stcb, NULL);
10014 #endif
10015                         sctp_timer_validation(inp, stcb, asoc);
10016                         return;
10017                 }
10018                 if (ret < 0) {
10019                         /*-
10020                          * The count was off.. retran is not happening so do
10021                          * the normal retransmission.
10022                          */
10023 #ifdef SCTP_AUDITING_ENABLED
10024                         sctp_auditing(9, inp, stcb, NULL);
10025 #endif
10026                         if (ret == SCTP_RETRAN_EXIT) {
10027                                 return;
10028                         }
10029                         break;
10030                 }
10031                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10032                         /* Only one transmission allowed out of a timeout */
10033 #ifdef SCTP_AUDITING_ENABLED
10034                         sctp_auditing(10, inp, stcb, NULL);
10035 #endif
10036                         /* Push out any control */
10037                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10038                             &now, &now_filled, frag_point, so_locked);
10039                         return;
10040                 }
10041                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10042                         /* Hit FR burst limit */
10043                         return;
10044                 }
10045                 if ((num_out == 0) && (ret == 0)) {
10046                         /* No more retrans to send */
10047                         break;
10048                 }
10049         }
10050 #ifdef SCTP_AUDITING_ENABLED
10051         sctp_auditing(12, inp, stcb, NULL);
10052 #endif
10053         /* Check for bad destinations, if they exist move chunks around. */
10054         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10055                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10056                         /*-
10057                          * if possible move things off of this address we
10058                          * still may send below due to the dormant state but
10059                          * we try to find an alternate address to send to
10060                          * and if we have one we move all queued data on the
10061                          * out wheel to this alternate address.
10062                          */
10063                         if (net->ref_count > 1)
10064                                 sctp_move_chunks_from_net(stcb, net);
10065                 } else {
10066                         /*-
10067                          * if ((asoc->sat_network) || (net->addr_is_local))
10068                          * { burst_limit = asoc->max_burst *
10069                          * SCTP_SAT_NETWORK_BURST_INCR; }
10070                          */
10071                         if (asoc->max_burst > 0) {
10072                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10073                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10074                                                 /*
10075                                                  * JRS - Use the congestion
10076                                                  * control given in the
10077                                                  * congestion control module
10078                                                  */
10079                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10080                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10081                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10082                                                 }
10083                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10084                                         }
10085                                         net->fast_retran_ip = 0;
10086                                 } else {
10087                                         if (net->flight_size == 0) {
10088                                                 /*
10089                                                  * Should be decaying the
10090                                                  * cwnd here
10091                                                  */
10092                                                 ;
10093                                         }
10094                                 }
10095                         }
10096                 }
10097         }
10098         burst_cnt = 0;
10099         do {
10100                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10101                     &reason_code, 0, from_where,
10102                     &now, &now_filled, frag_point, so_locked);
10103                 if (error) {
10104                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10105                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10106                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10107                         }
10108                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10109                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10110                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10111                         }
10112                         break;
10113                 }
10114                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10115
10116                 tot_out += num_out;
10117                 burst_cnt++;
10118                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10119                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10120                         if (num_out == 0) {
10121                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10122                         }
10123                 }
10124                 if (nagle_on) {
10125                         /*
10126                          * When the Nagle algorithm is used, look at how
10127                          * much is unsent, then if its smaller than an MTU
10128                          * and we have data in flight we stop, except if we
10129                          * are handling a fragmented user message.
10130                          */
10131                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10132                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10133                             (stcb->asoc.total_flight > 0)) {
10134 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10135                                 break;
10136                         }
10137                 }
10138                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10139                     TAILQ_EMPTY(&asoc->send_queue) &&
10140                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10141                         /* Nothing left to send */
10142                         break;
10143                 }
10144                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10145                         /* Nothing left to send */
10146                         break;
10147                 }
10148         } while (num_out &&
10149             ((asoc->max_burst == 0) ||
10150             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10151             (burst_cnt < asoc->max_burst)));
10152
10153         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10154                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10155                         SCTP_STAT_INCR(sctps_maxburstqueued);
10156                         asoc->burst_limit_applied = 1;
10157                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10158                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10159                         }
10160                 } else {
10161                         asoc->burst_limit_applied = 0;
10162                 }
10163         }
10164         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10165                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10166         }
10167         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10168             tot_out);
10169
10170         /*-
10171          * Now we need to clean up the control chunk chain if a ECNE is on
10172          * it. It must be marked as UNSENT again so next call will continue
10173          * to send it until such time that we get a CWR, to remove it.
10174          */
10175         if (stcb->asoc.ecn_echo_cnt_onq)
10176                 sctp_fix_ecn_echo(asoc);
10177
10178         if (stcb->asoc.trigger_reset) {
10179                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10180                         goto do_it_again;
10181                 }
10182         }
10183         return;
10184 }
10185
10186 int
10187 sctp_output(
10188     struct sctp_inpcb *inp,
10189     struct mbuf *m,
10190     struct sockaddr *addr,
10191     struct mbuf *control,
10192     struct thread *p,
10193     int flags)
10194 {
10195         if (inp == NULL) {
10196                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10197                 return (EINVAL);
10198         }
10199
10200         if (inp->sctp_socket == NULL) {
10201                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10202                 return (EINVAL);
10203         }
10204         return (sctp_sosend(inp->sctp_socket,
10205             addr,
10206             (struct uio *)NULL,
10207             m,
10208             control,
10209             flags, p
10210             ));
10211 }
10212
10213 void
10214 send_forward_tsn(struct sctp_tcb *stcb,
10215     struct sctp_association *asoc)
10216 {
10217         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10218         struct sctp_forward_tsn_chunk *fwdtsn;
10219         struct sctp_strseq *strseq;
10220         struct sctp_strseq_mid *strseq_m;
10221         uint32_t advance_peer_ack_point;
10222         unsigned int cnt_of_space, i, ovh;
10223         unsigned int space_needed;
10224         unsigned int cnt_of_skipped = 0;
10225
10226         SCTP_TCB_LOCK_ASSERT(stcb);
10227         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10228                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10229                         /* mark it to unsent */
10230                         chk->sent = SCTP_DATAGRAM_UNSENT;
10231                         chk->snd_count = 0;
10232                         /* Do we correct its output location? */
10233                         if (chk->whoTo) {
10234                                 sctp_free_remote_addr(chk->whoTo);
10235                                 chk->whoTo = NULL;
10236                         }
10237                         goto sctp_fill_in_rest;
10238                 }
10239         }
10240         /* Ok if we reach here we must build one */
10241         sctp_alloc_a_chunk(stcb, chk);
10242         if (chk == NULL) {
10243                 return;
10244         }
10245         asoc->fwd_tsn_cnt++;
10246         chk->copy_by_ref = 0;
10247         /*
10248          * We don't do the old thing here since this is used not for on-wire
10249          * but to tell if we are sending a fwd-tsn by the stack during
10250          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10251          */
10252         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10253         chk->rec.chunk_id.can_take_data = 0;
10254         chk->flags = 0;
10255         chk->asoc = asoc;
10256         chk->whoTo = NULL;
10257         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10258         if (chk->data == NULL) {
10259                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10260                 return;
10261         }
10262         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10263         chk->sent = SCTP_DATAGRAM_UNSENT;
10264         chk->snd_count = 0;
10265         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10266         asoc->ctrl_queue_cnt++;
10267 sctp_fill_in_rest:
10268         /*-
10269          * Here we go through and fill out the part that deals with
10270          * stream/seq of the ones we skip.
10271          */
10272         SCTP_BUF_LEN(chk->data) = 0;
10273         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10274                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10275                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10276                         /* no more to look at */
10277                         break;
10278                 }
10279                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10280                         /* We don't report these */
10281                         continue;
10282                 }
10283                 cnt_of_skipped++;
10284         }
10285         if (asoc->idata_supported) {
10286                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10287                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10288         } else {
10289                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10290                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10291         }
10292         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10293
10294         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10295                 ovh = SCTP_MIN_OVERHEAD;
10296         } else {
10297                 ovh = SCTP_MIN_V4_OVERHEAD;
10298         }
10299         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10300                 /* trim to a mtu size */
10301                 cnt_of_space = asoc->smallest_mtu - ovh;
10302         }
10303         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10304                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10305                     0xff, 0, cnt_of_skipped,
10306                     asoc->advanced_peer_ack_point);
10307         }
10308         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10309         if (cnt_of_space < space_needed) {
10310                 /*-
10311                  * ok we must trim down the chunk by lowering the
10312                  * advance peer ack point.
10313                  */
10314                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10315                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10316                             0xff, 0xff, cnt_of_space,
10317                             space_needed);
10318                 }
10319                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10320                 if (asoc->idata_supported) {
10321                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10322                 } else {
10323                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10324                 }
10325                 /*-
10326                  * Go through and find the TSN that will be the one
10327                  * we report.
10328                  */
10329                 at = TAILQ_FIRST(&asoc->sent_queue);
10330                 if (at != NULL) {
10331                         for (i = 0; i < cnt_of_skipped; i++) {
10332                                 tp1 = TAILQ_NEXT(at, sctp_next);
10333                                 if (tp1 == NULL) {
10334                                         break;
10335                                 }
10336                                 at = tp1;
10337                         }
10338                 }
10339                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10340                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10341                             0xff, cnt_of_skipped, at->rec.data.tsn,
10342                             asoc->advanced_peer_ack_point);
10343                 }
10344                 last = at;
10345                 /*-
10346                  * last now points to last one I can report, update
10347                  * peer ack point
10348                  */
10349                 if (last) {
10350                         advance_peer_ack_point = last->rec.data.tsn;
10351                 }
10352                 if (asoc->idata_supported) {
10353                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10354                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10355                 } else {
10356                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10357                             cnt_of_skipped * sizeof(struct sctp_strseq);
10358                 }
10359         }
10360         chk->send_size = space_needed;
10361         /* Setup the chunk */
10362         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10363         fwdtsn->ch.chunk_length = htons(chk->send_size);
10364         fwdtsn->ch.chunk_flags = 0;
10365         if (asoc->idata_supported) {
10366                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10367         } else {
10368                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10369         }
10370         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10371         SCTP_BUF_LEN(chk->data) = chk->send_size;
10372         fwdtsn++;
10373         /*-
10374          * Move pointer to after the fwdtsn and transfer to the
10375          * strseq pointer.
10376          */
10377         if (asoc->idata_supported) {
10378                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10379                 strseq = NULL;
10380         } else {
10381                 strseq = (struct sctp_strseq *)fwdtsn;
10382                 strseq_m = NULL;
10383         }
10384         /*-
10385          * Now populate the strseq list. This is done blindly
10386          * without pulling out duplicate stream info. This is
10387          * inefficent but won't harm the process since the peer will
10388          * look at these in sequence and will thus release anything.
10389          * It could mean we exceed the PMTU and chop off some that
10390          * we could have included.. but this is unlikely (aka 1432/4
10391          * would mean 300+ stream seq's would have to be reported in
10392          * one FWD-TSN. With a bit of work we can later FIX this to
10393          * optimize and pull out duplicates.. but it does add more
10394          * overhead. So for now... not!
10395          */
10396         i = 0;
10397         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10398                 if (i >= cnt_of_skipped) {
10399                         break;
10400                 }
10401                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10402                         /* We don't report these */
10403                         continue;
10404                 }
10405                 if (at->rec.data.tsn == advance_peer_ack_point) {
10406                         at->rec.data.fwd_tsn_cnt = 0;
10407                 }
10408                 if (asoc->idata_supported) {
10409                         strseq_m->sid = htons(at->rec.data.sid);
10410                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10411                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10412                         } else {
10413                                 strseq_m->flags = 0;
10414                         }
10415                         strseq_m->mid = htonl(at->rec.data.mid);
10416                         strseq_m++;
10417                 } else {
10418                         strseq->sid = htons(at->rec.data.sid);
10419                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10420                         strseq++;
10421                 }
10422                 i++;
10423         }
10424         return;
10425 }
10426
10427 void
10428 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10429 {
10430         /*-
10431          * Queue up a SACK or NR-SACK in the control queue.
10432          * We must first check to see if a SACK or NR-SACK is
10433          * somehow on the control queue.
10434          * If so, we will take and and remove the old one.
10435          */
10436         struct sctp_association *asoc;
10437         struct sctp_tmit_chunk *chk, *a_chk;
10438         struct sctp_sack_chunk *sack;
10439         struct sctp_nr_sack_chunk *nr_sack;
10440         struct sctp_gap_ack_block *gap_descriptor;
10441         const struct sack_track *selector;
10442         int mergeable = 0;
10443         int offset;
10444         caddr_t limit;
10445         uint32_t *dup;
10446         int limit_reached = 0;
10447         unsigned int i, siz, j;
10448         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10449         int num_dups = 0;
10450         int space_req;
10451         uint32_t highest_tsn;
10452         uint8_t flags;
10453         uint8_t type;
10454         uint8_t tsn_map;
10455
10456         if (stcb->asoc.nrsack_supported == 1) {
10457                 type = SCTP_NR_SELECTIVE_ACK;
10458         } else {
10459                 type = SCTP_SELECTIVE_ACK;
10460         }
10461         a_chk = NULL;
10462         asoc = &stcb->asoc;
10463         SCTP_TCB_LOCK_ASSERT(stcb);
10464         if (asoc->last_data_chunk_from == NULL) {
10465                 /* Hmm we never received anything */
10466                 return;
10467         }
10468         sctp_slide_mapping_arrays(stcb);
10469         sctp_set_rwnd(stcb, asoc);
10470         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10471                 if (chk->rec.chunk_id.id == type) {
10472                         /* Hmm, found a sack already on queue, remove it */
10473                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10474                         asoc->ctrl_queue_cnt--;
10475                         a_chk = chk;
10476                         if (a_chk->data) {
10477                                 sctp_m_freem(a_chk->data);
10478                                 a_chk->data = NULL;
10479                         }
10480                         if (a_chk->whoTo) {
10481                                 sctp_free_remote_addr(a_chk->whoTo);
10482                                 a_chk->whoTo = NULL;
10483                         }
10484                         break;
10485                 }
10486         }
10487         if (a_chk == NULL) {
10488                 sctp_alloc_a_chunk(stcb, a_chk);
10489                 if (a_chk == NULL) {
10490                         /* No memory so we drop the idea, and set a timer */
10491                         if (stcb->asoc.delayed_ack) {
10492                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10493                                     stcb->sctp_ep, stcb, NULL,
10494                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10495                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10496                                     stcb->sctp_ep, stcb, NULL);
10497                         } else {
10498                                 stcb->asoc.send_sack = 1;
10499                         }
10500                         return;
10501                 }
10502                 a_chk->copy_by_ref = 0;
10503                 a_chk->rec.chunk_id.id = type;
10504                 a_chk->rec.chunk_id.can_take_data = 1;
10505         }
10506         /* Clear our pkt counts */
10507         asoc->data_pkts_seen = 0;
10508
10509         a_chk->flags = 0;
10510         a_chk->asoc = asoc;
10511         a_chk->snd_count = 0;
10512         a_chk->send_size = 0;   /* fill in later */
10513         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10514         a_chk->whoTo = NULL;
10515
10516         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10517                 /*-
10518                  * Ok, the destination for the SACK is unreachable, lets see if
10519                  * we can select an alternate to asoc->last_data_chunk_from
10520                  */
10521                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10522                 if (a_chk->whoTo == NULL) {
10523                         /* Nope, no alternate */
10524                         a_chk->whoTo = asoc->last_data_chunk_from;
10525                 }
10526         } else {
10527                 a_chk->whoTo = asoc->last_data_chunk_from;
10528         }
10529         if (a_chk->whoTo) {
10530                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10531         }
10532         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10533                 highest_tsn = asoc->highest_tsn_inside_map;
10534         } else {
10535                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10536         }
10537         if (highest_tsn == asoc->cumulative_tsn) {
10538                 /* no gaps */
10539                 if (type == SCTP_SELECTIVE_ACK) {
10540                         space_req = sizeof(struct sctp_sack_chunk);
10541                 } else {
10542                         space_req = sizeof(struct sctp_nr_sack_chunk);
10543                 }
10544         } else {
10545                 /* gaps get a cluster */
10546                 space_req = MCLBYTES;
10547         }
10548         /* Ok now lets formulate a MBUF with our sack */
10549         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10550         if ((a_chk->data == NULL) ||
10551             (a_chk->whoTo == NULL)) {
10552                 /* rats, no mbuf memory */
10553                 if (a_chk->data) {
10554                         /* was a problem with the destination */
10555                         sctp_m_freem(a_chk->data);
10556                         a_chk->data = NULL;
10557                 }
10558                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10559                 /* sa_ignore NO_NULL_CHK */
10560                 if (stcb->asoc.delayed_ack) {
10561                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10562                             stcb->sctp_ep, stcb, NULL,
10563                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10564                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10565                             stcb->sctp_ep, stcb, NULL);
10566                 } else {
10567                         stcb->asoc.send_sack = 1;
10568                 }
10569                 return;
10570         }
10571         /* ok, lets go through and fill it in */
10572         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10573         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10574         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10575                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10576         }
10577         limit = mtod(a_chk->data, caddr_t);
10578         limit += space;
10579
10580         flags = 0;
10581
10582         if ((asoc->sctp_cmt_on_off > 0) &&
10583             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10584                 /*-
10585                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10586                  * received, then set high bit to 1, else 0. Reset
10587                  * pkts_rcvd.
10588                  */
10589                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10590                 asoc->cmt_dac_pkts_rcvd = 0;
10591         }
10592 #ifdef SCTP_ASOCLOG_OF_TSNS
10593         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10594         stcb->asoc.cumack_log_atsnt++;
10595         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10596                 stcb->asoc.cumack_log_atsnt = 0;
10597         }
10598 #endif
10599         /* reset the readers interpretation */
10600         stcb->freed_by_sorcv_sincelast = 0;
10601
10602         if (type == SCTP_SELECTIVE_ACK) {
10603                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10604                 nr_sack = NULL;
10605                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10606                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10607                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10608                 } else {
10609                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10610                 }
10611         } else {
10612                 sack = NULL;
10613                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10614                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10615                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10616                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10617                 } else {
10618                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10619                 }
10620         }
10621
10622         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10623                 offset = 1;
10624         } else {
10625                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10626         }
10627         if (((type == SCTP_SELECTIVE_ACK) &&
10628             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10629             ((type == SCTP_NR_SELECTIVE_ACK) &&
10630             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10631                 /* we have a gap .. maybe */
10632                 for (i = 0; i < siz; i++) {
10633                         tsn_map = asoc->mapping_array[i];
10634                         if (type == SCTP_SELECTIVE_ACK) {
10635                                 tsn_map |= asoc->nr_mapping_array[i];
10636                         }
10637                         if (i == 0) {
10638                                 /*
10639                                  * Clear all bits corresponding to TSNs
10640                                  * smaller or equal to the cumulative TSN.
10641                                  */
10642                                 tsn_map &= (~0U << (1 - offset));
10643                         }
10644                         selector = &sack_array[tsn_map];
10645                         if (mergeable && selector->right_edge) {
10646                                 /*
10647                                  * Backup, left and right edges were ok to
10648                                  * merge.
10649                                  */
10650                                 num_gap_blocks--;
10651                                 gap_descriptor--;
10652                         }
10653                         if (selector->num_entries == 0)
10654                                 mergeable = 0;
10655                         else {
10656                                 for (j = 0; j < selector->num_entries; j++) {
10657                                         if (mergeable && selector->right_edge) {
10658                                                 /*
10659                                                  * do a merge by NOT setting
10660                                                  * the left side
10661                                                  */
10662                                                 mergeable = 0;
10663                                         } else {
10664                                                 /*
10665                                                  * no merge, set the left
10666                                                  * side
10667                                                  */
10668                                                 mergeable = 0;
10669                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10670                                         }
10671                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10672                                         num_gap_blocks++;
10673                                         gap_descriptor++;
10674                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10675                                                 /* no more room */
10676                                                 limit_reached = 1;
10677                                                 break;
10678                                         }
10679                                 }
10680                                 if (selector->left_edge) {
10681                                         mergeable = 1;
10682                                 }
10683                         }
10684                         if (limit_reached) {
10685                                 /* Reached the limit stop */
10686                                 break;
10687                         }
10688                         offset += 8;
10689                 }
10690         }
10691         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10692             (limit_reached == 0)) {
10693                 mergeable = 0;
10694
10695                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10696                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10697                 } else {
10698                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10699                 }
10700
10701                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10702                         offset = 1;
10703                 } else {
10704                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10705                 }
10706                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10707                         /* we have a gap .. maybe */
10708                         for (i = 0; i < siz; i++) {
10709                                 tsn_map = asoc->nr_mapping_array[i];
10710                                 if (i == 0) {
10711                                         /*
10712                                          * Clear all bits corresponding to
10713                                          * TSNs smaller or equal to the
10714                                          * cumulative TSN.
10715                                          */
10716                                         tsn_map &= (~0U << (1 - offset));
10717                                 }
10718                                 selector = &sack_array[tsn_map];
10719                                 if (mergeable && selector->right_edge) {
10720                                         /*
10721                                          * Backup, left and right edges were
10722                                          * ok to merge.
10723                                          */
10724                                         num_nr_gap_blocks--;
10725                                         gap_descriptor--;
10726                                 }
10727                                 if (selector->num_entries == 0)
10728                                         mergeable = 0;
10729                                 else {
10730                                         for (j = 0; j < selector->num_entries; j++) {
10731                                                 if (mergeable && selector->right_edge) {
10732                                                         /*
10733                                                          * do a merge by NOT
10734                                                          * setting the left
10735                                                          * side
10736                                                          */
10737                                                         mergeable = 0;
10738                                                 } else {
10739                                                         /*
10740                                                          * no merge, set the
10741                                                          * left side
10742                                                          */
10743                                                         mergeable = 0;
10744                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10745                                                 }
10746                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10747                                                 num_nr_gap_blocks++;
10748                                                 gap_descriptor++;
10749                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10750                                                         /* no more room */
10751                                                         limit_reached = 1;
10752                                                         break;
10753                                                 }
10754                                         }
10755                                         if (selector->left_edge) {
10756                                                 mergeable = 1;
10757                                         }
10758                                 }
10759                                 if (limit_reached) {
10760                                         /* Reached the limit stop */
10761                                         break;
10762                                 }
10763                                 offset += 8;
10764                         }
10765                 }
10766         }
10767         /* now we must add any dups we are going to report. */
10768         if ((limit_reached == 0) && (asoc->numduptsns)) {
10769                 dup = (uint32_t *)gap_descriptor;
10770                 for (i = 0; i < asoc->numduptsns; i++) {
10771                         *dup = htonl(asoc->dup_tsns[i]);
10772                         dup++;
10773                         num_dups++;
10774                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10775                                 /* no more room */
10776                                 break;
10777                         }
10778                 }
10779                 asoc->numduptsns = 0;
10780         }
10781         /*
10782          * now that the chunk is prepared queue it to the control chunk
10783          * queue.
10784          */
10785         if (type == SCTP_SELECTIVE_ACK) {
10786                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10787                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10788                     num_dups * sizeof(int32_t));
10789                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10790                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10791                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10792                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10793                 sack->sack.num_dup_tsns = htons(num_dups);
10794                 sack->ch.chunk_type = type;
10795                 sack->ch.chunk_flags = flags;
10796                 sack->ch.chunk_length = htons(a_chk->send_size);
10797         } else {
10798                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10799                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10800                     num_dups * sizeof(int32_t));
10801                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10802                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10803                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10804                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10805                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10806                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10807                 nr_sack->nr_sack.reserved = 0;
10808                 nr_sack->ch.chunk_type = type;
10809                 nr_sack->ch.chunk_flags = flags;
10810                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10811         }
10812         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10813         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10814         asoc->ctrl_queue_cnt++;
10815         asoc->send_sack = 0;
10816         SCTP_STAT_INCR(sctps_sendsacks);
10817         return;
10818 }
10819
10820 void
10821 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10822 {
10823         struct mbuf *m_abort, *m, *m_last;
10824         struct mbuf *m_out, *m_end = NULL;
10825         struct sctp_abort_chunk *abort;
10826         struct sctp_auth_chunk *auth = NULL;
10827         struct sctp_nets *net;
10828         uint32_t vtag;
10829         uint32_t auth_offset = 0;
10830         int error;
10831         uint16_t cause_len, chunk_len, padding_len;
10832
10833         SCTP_TCB_LOCK_ASSERT(stcb);
10834         /*-
10835          * Add an AUTH chunk, if chunk requires it and save the offset into
10836          * the chain for AUTH
10837          */
10838         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10839             stcb->asoc.peer_auth_chunks)) {
10840                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10841                     stcb, SCTP_ABORT_ASSOCIATION);
10842                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10843         } else {
10844                 m_out = NULL;
10845         }
10846         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10847         if (m_abort == NULL) {
10848                 if (m_out) {
10849                         sctp_m_freem(m_out);
10850                 }
10851                 if (operr) {
10852                         sctp_m_freem(operr);
10853                 }
10854                 return;
10855         }
10856         /* link in any error */
10857         SCTP_BUF_NEXT(m_abort) = operr;
10858         cause_len = 0;
10859         m_last = NULL;
10860         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10861                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10862                 if (SCTP_BUF_NEXT(m) == NULL) {
10863                         m_last = m;
10864                 }
10865         }
10866         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10867         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10868         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10869         if (m_out == NULL) {
10870                 /* NO Auth chunk prepended, so reserve space in front */
10871                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10872                 m_out = m_abort;
10873         } else {
10874                 /* Put AUTH chunk at the front of the chain */
10875                 SCTP_BUF_NEXT(m_end) = m_abort;
10876         }
10877         if (stcb->asoc.alternate) {
10878                 net = stcb->asoc.alternate;
10879         } else {
10880                 net = stcb->asoc.primary_destination;
10881         }
10882         /* Fill in the ABORT chunk header. */
10883         abort = mtod(m_abort, struct sctp_abort_chunk *);
10884         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10885         if (stcb->asoc.peer_vtag == 0) {
10886                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10887                 vtag = stcb->asoc.my_vtag;
10888                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10889         } else {
10890                 vtag = stcb->asoc.peer_vtag;
10891                 abort->ch.chunk_flags = 0;
10892         }
10893         abort->ch.chunk_length = htons(chunk_len);
10894         /* Add padding, if necessary. */
10895         if (padding_len > 0) {
10896                 if ((m_last == NULL) ||
10897                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10898                         sctp_m_freem(m_out);
10899                         return;
10900                 }
10901         }
10902         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10903             (struct sockaddr *)&net->ro._l_addr,
10904             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10905             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10906             stcb->asoc.primary_destination->port, NULL,
10907             0, 0,
10908             so_locked))) {
10909                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10910                 if (error == ENOBUFS) {
10911                         stcb->asoc.ifp_had_enobuf = 1;
10912                         SCTP_STAT_INCR(sctps_lowlevelerr);
10913                 }
10914         } else {
10915                 stcb->asoc.ifp_had_enobuf = 0;
10916         }
10917         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10918 }
10919
10920 void
10921 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10922     struct sctp_nets *net,
10923     int reflect_vtag)
10924 {
10925         /* formulate and SEND a SHUTDOWN-COMPLETE */
10926         struct mbuf *m_shutdown_comp;
10927         struct sctp_shutdown_complete_chunk *shutdown_complete;
10928         uint32_t vtag;
10929         int error;
10930         uint8_t flags;
10931
10932         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10933         if (m_shutdown_comp == NULL) {
10934                 /* no mbuf's */
10935                 return;
10936         }
10937         if (reflect_vtag) {
10938                 flags = SCTP_HAD_NO_TCB;
10939                 vtag = stcb->asoc.my_vtag;
10940         } else {
10941                 flags = 0;
10942                 vtag = stcb->asoc.peer_vtag;
10943         }
10944         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10945         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10946         shutdown_complete->ch.chunk_flags = flags;
10947         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10948         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10949         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10950             (struct sockaddr *)&net->ro._l_addr,
10951             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10952             stcb->sctp_ep->sctp_lport, stcb->rport,
10953             htonl(vtag),
10954             net->port, NULL,
10955             0, 0,
10956             SCTP_SO_NOT_LOCKED))) {
10957                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10958                 if (error == ENOBUFS) {
10959                         stcb->asoc.ifp_had_enobuf = 1;
10960                         SCTP_STAT_INCR(sctps_lowlevelerr);
10961                 }
10962         } else {
10963                 stcb->asoc.ifp_had_enobuf = 0;
10964         }
10965         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10966         return;
10967 }
10968
10969 static void
10970 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10971     struct sctphdr *sh, uint32_t vtag,
10972     uint8_t type, struct mbuf *cause,
10973     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10974     uint32_t vrf_id, uint16_t port)
10975 {
10976         struct mbuf *o_pak;
10977         struct mbuf *mout;
10978         struct sctphdr *shout;
10979         struct sctp_chunkhdr *ch;
10980 #if defined(INET) || defined(INET6)
10981         struct udphdr *udp;
10982 #endif
10983         int ret, len, cause_len, padding_len;
10984 #ifdef INET
10985         struct sockaddr_in *src_sin, *dst_sin;
10986         struct ip *ip;
10987 #endif
10988 #ifdef INET6
10989         struct sockaddr_in6 *src_sin6, *dst_sin6;
10990         struct ip6_hdr *ip6;
10991 #endif
10992
10993         /* Compute the length of the cause and add final padding. */
10994         cause_len = 0;
10995         if (cause != NULL) {
10996                 struct mbuf *m_at, *m_last = NULL;
10997
10998                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10999                         if (SCTP_BUF_NEXT(m_at) == NULL)
11000                                 m_last = m_at;
11001                         cause_len += SCTP_BUF_LEN(m_at);
11002                 }
11003                 padding_len = cause_len % 4;
11004                 if (padding_len != 0) {
11005                         padding_len = 4 - padding_len;
11006                 }
11007                 if (padding_len != 0) {
11008                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11009                                 sctp_m_freem(cause);
11010                                 return;
11011                         }
11012                 }
11013         } else {
11014                 padding_len = 0;
11015         }
11016         /* Get an mbuf for the header. */
11017         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11018         switch (dst->sa_family) {
11019 #ifdef INET
11020         case AF_INET:
11021                 len += sizeof(struct ip);
11022                 break;
11023 #endif
11024 #ifdef INET6
11025         case AF_INET6:
11026                 len += sizeof(struct ip6_hdr);
11027                 break;
11028 #endif
11029         default:
11030                 break;
11031         }
11032 #if defined(INET) || defined(INET6)
11033         if (port) {
11034                 len += sizeof(struct udphdr);
11035         }
11036 #endif
11037         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11038         if (mout == NULL) {
11039                 if (cause) {
11040                         sctp_m_freem(cause);
11041                 }
11042                 return;
11043         }
11044         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11045         SCTP_BUF_LEN(mout) = len;
11046         SCTP_BUF_NEXT(mout) = cause;
11047         M_SETFIB(mout, fibnum);
11048         mout->m_pkthdr.flowid = mflowid;
11049         M_HASHTYPE_SET(mout, mflowtype);
11050 #ifdef INET
11051         ip = NULL;
11052 #endif
11053 #ifdef INET6
11054         ip6 = NULL;
11055 #endif
11056         switch (dst->sa_family) {
11057 #ifdef INET
11058         case AF_INET:
11059                 src_sin = (struct sockaddr_in *)src;
11060                 dst_sin = (struct sockaddr_in *)dst;
11061                 ip = mtod(mout, struct ip *);
11062                 ip->ip_v = IPVERSION;
11063                 ip->ip_hl = (sizeof(struct ip) >> 2);
11064                 ip->ip_tos = 0;
11065                 ip->ip_off = htons(IP_DF);
11066                 ip_fillid(ip);
11067                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11068                 if (port) {
11069                         ip->ip_p = IPPROTO_UDP;
11070                 } else {
11071                         ip->ip_p = IPPROTO_SCTP;
11072                 }
11073                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11074                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11075                 ip->ip_sum = 0;
11076                 len = sizeof(struct ip);
11077                 shout = (struct sctphdr *)((caddr_t)ip + len);
11078                 break;
11079 #endif
11080 #ifdef INET6
11081         case AF_INET6:
11082                 src_sin6 = (struct sockaddr_in6 *)src;
11083                 dst_sin6 = (struct sockaddr_in6 *)dst;
11084                 ip6 = mtod(mout, struct ip6_hdr *);
11085                 ip6->ip6_flow = htonl(0x60000000);
11086                 if (V_ip6_auto_flowlabel) {
11087                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11088                 }
11089                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11090                 if (port) {
11091                         ip6->ip6_nxt = IPPROTO_UDP;
11092                 } else {
11093                         ip6->ip6_nxt = IPPROTO_SCTP;
11094                 }
11095                 ip6->ip6_src = dst_sin6->sin6_addr;
11096                 ip6->ip6_dst = src_sin6->sin6_addr;
11097                 len = sizeof(struct ip6_hdr);
11098                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11099                 break;
11100 #endif
11101         default:
11102                 len = 0;
11103                 shout = mtod(mout, struct sctphdr *);
11104                 break;
11105         }
11106 #if defined(INET) || defined(INET6)
11107         if (port) {
11108                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11109                         sctp_m_freem(mout);
11110                         return;
11111                 }
11112                 udp = (struct udphdr *)shout;
11113                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11114                 udp->uh_dport = port;
11115                 udp->uh_sum = 0;
11116                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11117                     sizeof(struct sctphdr) +
11118                     sizeof(struct sctp_chunkhdr) +
11119                     cause_len + padding_len));
11120                 len += sizeof(struct udphdr);
11121                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11122         } else {
11123                 udp = NULL;
11124         }
11125 #endif
11126         shout->src_port = sh->dest_port;
11127         shout->dest_port = sh->src_port;
11128         shout->checksum = 0;
11129         if (vtag) {
11130                 shout->v_tag = htonl(vtag);
11131         } else {
11132                 shout->v_tag = sh->v_tag;
11133         }
11134         len += sizeof(struct sctphdr);
11135         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11136         ch->chunk_type = type;
11137         if (vtag) {
11138                 ch->chunk_flags = 0;
11139         } else {
11140                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11141         }
11142         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11143         len += sizeof(struct sctp_chunkhdr);
11144         len += cause_len + padding_len;
11145
11146         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11147                 sctp_m_freem(mout);
11148                 return;
11149         }
11150         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11151         switch (dst->sa_family) {
11152 #ifdef INET
11153         case AF_INET:
11154                 if (port) {
11155                         if (V_udp_cksum) {
11156                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11157                         } else {
11158                                 udp->uh_sum = 0;
11159                         }
11160                 }
11161                 ip->ip_len = htons(len);
11162                 if (port) {
11163                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11164                         SCTP_STAT_INCR(sctps_sendswcrc);
11165                         if (V_udp_cksum) {
11166                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11167                         }
11168                 } else {
11169                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11170                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11171                         SCTP_STAT_INCR(sctps_sendhwcrc);
11172                 }
11173 #ifdef SCTP_PACKET_LOGGING
11174                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11175                         sctp_packet_log(o_pak);
11176                 }
11177 #endif
11178                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11179                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11180                 break;
11181 #endif
11182 #ifdef INET6
11183         case AF_INET6:
11184                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11185                 if (port) {
11186                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11187                         SCTP_STAT_INCR(sctps_sendswcrc);
11188                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11189                                 udp->uh_sum = 0xffff;
11190                         }
11191                 } else {
11192                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11193                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11194                         SCTP_STAT_INCR(sctps_sendhwcrc);
11195                 }
11196 #ifdef SCTP_PACKET_LOGGING
11197                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11198                         sctp_packet_log(o_pak);
11199                 }
11200 #endif
11201                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11202                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11203                 break;
11204 #endif
11205         default:
11206                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11207                     dst->sa_family);
11208                 sctp_m_freem(mout);
11209                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11210                 return;
11211         }
11212         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11213         if (port) {
11214                 UDPSTAT_INC(udps_opackets);
11215         }
11216         SCTP_STAT_INCR(sctps_sendpackets);
11217         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11218         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11219         if (ret) {
11220                 SCTP_STAT_INCR(sctps_senderrors);
11221         }
11222         return;
11223 }
11224
11225 void
11226 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11227     struct sctphdr *sh,
11228     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11229     uint32_t vrf_id, uint16_t port)
11230 {
11231         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11232             mflowtype, mflowid, fibnum,
11233             vrf_id, port);
11234 }
11235
11236 void
11237 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11238 {
11239         struct sctp_tmit_chunk *chk;
11240         struct sctp_heartbeat_chunk *hb;
11241         struct timeval now;
11242
11243         SCTP_TCB_LOCK_ASSERT(stcb);
11244         if (net == NULL) {
11245                 return;
11246         }
11247         (void)SCTP_GETTIME_TIMEVAL(&now);
11248         switch (net->ro._l_addr.sa.sa_family) {
11249 #ifdef INET
11250         case AF_INET:
11251                 break;
11252 #endif
11253 #ifdef INET6
11254         case AF_INET6:
11255                 break;
11256 #endif
11257         default:
11258                 return;
11259         }
11260         sctp_alloc_a_chunk(stcb, chk);
11261         if (chk == NULL) {
11262                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11263                 return;
11264         }
11265
11266         chk->copy_by_ref = 0;
11267         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11268         chk->rec.chunk_id.can_take_data = 1;
11269         chk->flags = 0;
11270         chk->asoc = &stcb->asoc;
11271         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11272
11273         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11274         if (chk->data == NULL) {
11275                 sctp_free_a_chunk(stcb, chk, so_locked);
11276                 return;
11277         }
11278         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11279         SCTP_BUF_LEN(chk->data) = chk->send_size;
11280         chk->sent = SCTP_DATAGRAM_UNSENT;
11281         chk->snd_count = 0;
11282         chk->whoTo = net;
11283         atomic_add_int(&chk->whoTo->ref_count, 1);
11284         /* Now we have a mbuf that we can fill in with the details */
11285         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11286         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11287         /* fill out chunk header */
11288         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11289         hb->ch.chunk_flags = 0;
11290         hb->ch.chunk_length = htons(chk->send_size);
11291         /* Fill out hb parameter */
11292         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11293         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11294         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11295         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11296         /* Did our user request this one, put it in */
11297         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11298         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11299         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11300                 /*
11301                  * we only take from the entropy pool if the address is not
11302                  * confirmed.
11303                  */
11304                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11305                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11306         } else {
11307                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11308                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11309         }
11310         switch (net->ro._l_addr.sa.sa_family) {
11311 #ifdef INET
11312         case AF_INET:
11313                 memcpy(hb->heartbeat.hb_info.address,
11314                     &net->ro._l_addr.sin.sin_addr,
11315                     sizeof(net->ro._l_addr.sin.sin_addr));
11316                 break;
11317 #endif
11318 #ifdef INET6
11319         case AF_INET6:
11320                 memcpy(hb->heartbeat.hb_info.address,
11321                     &net->ro._l_addr.sin6.sin6_addr,
11322                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11323                 break;
11324 #endif
11325         default:
11326                 if (chk->data) {
11327                         sctp_m_freem(chk->data);
11328                         chk->data = NULL;
11329                 }
11330                 sctp_free_a_chunk(stcb, chk, so_locked);
11331                 return;
11332                 break;
11333         }
11334         net->hb_responded = 0;
11335         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11336         stcb->asoc.ctrl_queue_cnt++;
11337         SCTP_STAT_INCR(sctps_sendheartbeat);
11338         return;
11339 }
11340
11341 void
11342 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11343     uint32_t high_tsn)
11344 {
11345         struct sctp_association *asoc;
11346         struct sctp_ecne_chunk *ecne;
11347         struct sctp_tmit_chunk *chk;
11348
11349         if (net == NULL) {
11350                 return;
11351         }
11352         asoc = &stcb->asoc;
11353         SCTP_TCB_LOCK_ASSERT(stcb);
11354         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11355                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11356                         /* found a previous ECN_ECHO update it if needed */
11357                         uint32_t cnt, ctsn;
11358
11359                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11360                         ctsn = ntohl(ecne->tsn);
11361                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11362                                 ecne->tsn = htonl(high_tsn);
11363                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11364                         }
11365                         cnt = ntohl(ecne->num_pkts_since_cwr);
11366                         cnt++;
11367                         ecne->num_pkts_since_cwr = htonl(cnt);
11368                         return;
11369                 }
11370         }
11371         /* nope could not find one to update so we must build one */
11372         sctp_alloc_a_chunk(stcb, chk);
11373         if (chk == NULL) {
11374                 return;
11375         }
11376         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11377         chk->copy_by_ref = 0;
11378         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11379         chk->rec.chunk_id.can_take_data = 0;
11380         chk->flags = 0;
11381         chk->asoc = &stcb->asoc;
11382         chk->send_size = sizeof(struct sctp_ecne_chunk);
11383         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11384         if (chk->data == NULL) {
11385                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11386                 return;
11387         }
11388         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11389         SCTP_BUF_LEN(chk->data) = chk->send_size;
11390         chk->sent = SCTP_DATAGRAM_UNSENT;
11391         chk->snd_count = 0;
11392         chk->whoTo = net;
11393         atomic_add_int(&chk->whoTo->ref_count, 1);
11394
11395         stcb->asoc.ecn_echo_cnt_onq++;
11396         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11397         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11398         ecne->ch.chunk_flags = 0;
11399         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11400         ecne->tsn = htonl(high_tsn);
11401         ecne->num_pkts_since_cwr = htonl(1);
11402         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11403         asoc->ctrl_queue_cnt++;
11404 }
11405
11406 void
11407 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11408     struct mbuf *m, int len, int iphlen, int bad_crc)
11409 {
11410         struct sctp_association *asoc;
11411         struct sctp_pktdrop_chunk *drp;
11412         struct sctp_tmit_chunk *chk;
11413         uint8_t *datap;
11414         int was_trunc = 0;
11415         int fullsz = 0;
11416         long spc;
11417         int offset;
11418         struct sctp_chunkhdr *ch, chunk_buf;
11419         unsigned int chk_length;
11420
11421         if (!stcb) {
11422                 return;
11423         }
11424         asoc = &stcb->asoc;
11425         SCTP_TCB_LOCK_ASSERT(stcb);
11426         if (asoc->pktdrop_supported == 0) {
11427                 /*-
11428                  * peer must declare support before I send one.
11429                  */
11430                 return;
11431         }
11432         if (stcb->sctp_socket == NULL) {
11433                 return;
11434         }
11435         sctp_alloc_a_chunk(stcb, chk);
11436         if (chk == NULL) {
11437                 return;
11438         }
11439         chk->copy_by_ref = 0;
11440         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11441         chk->rec.chunk_id.can_take_data = 1;
11442         chk->flags = 0;
11443         len -= iphlen;
11444         chk->send_size = len;
11445         /* Validate that we do not have an ABORT in here. */
11446         offset = iphlen + sizeof(struct sctphdr);
11447         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11448             sizeof(*ch), (uint8_t *)&chunk_buf);
11449         while (ch != NULL) {
11450                 chk_length = ntohs(ch->chunk_length);
11451                 if (chk_length < sizeof(*ch)) {
11452                         /* break to abort land */
11453                         break;
11454                 }
11455                 switch (ch->chunk_type) {
11456                 case SCTP_PACKET_DROPPED:
11457                 case SCTP_ABORT_ASSOCIATION:
11458                 case SCTP_INITIATION_ACK:
11459                         /**
11460                          * We don't respond with an PKT-DROP to an ABORT
11461                          * or PKT-DROP. We also do not respond to an
11462                          * INIT-ACK, because we can't know if the initiation
11463                          * tag is correct or not.
11464                          */
11465                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11466                         return;
11467                 default:
11468                         break;
11469                 }
11470                 offset += SCTP_SIZE32(chk_length);
11471                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11472                     sizeof(*ch), (uint8_t *)&chunk_buf);
11473         }
11474
11475         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11476             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11477                 /*
11478                  * only send 1 mtu worth, trim off the excess on the end.
11479                  */
11480                 fullsz = len;
11481                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11482                 was_trunc = 1;
11483         }
11484         chk->asoc = &stcb->asoc;
11485         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11486         if (chk->data == NULL) {
11487 jump_out:
11488                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11489                 return;
11490         }
11491         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11492         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11493         if (drp == NULL) {
11494                 sctp_m_freem(chk->data);
11495                 chk->data = NULL;
11496                 goto jump_out;
11497         }
11498         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11499             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11500         chk->book_size_scale = 0;
11501         if (was_trunc) {
11502                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11503                 drp->trunc_len = htons(fullsz);
11504                 /*
11505                  * Len is already adjusted to size minus overhead above take
11506                  * out the pkt_drop chunk itself from it.
11507                  */
11508                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11509                 len = chk->send_size;
11510         } else {
11511                 /* no truncation needed */
11512                 drp->ch.chunk_flags = 0;
11513                 drp->trunc_len = htons(0);
11514         }
11515         if (bad_crc) {
11516                 drp->ch.chunk_flags |= SCTP_BADCRC;
11517         }
11518         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11519         SCTP_BUF_LEN(chk->data) = chk->send_size;
11520         chk->sent = SCTP_DATAGRAM_UNSENT;
11521         chk->snd_count = 0;
11522         if (net) {
11523                 /* we should hit here */
11524                 chk->whoTo = net;
11525                 atomic_add_int(&chk->whoTo->ref_count, 1);
11526         } else {
11527                 chk->whoTo = NULL;
11528         }
11529         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11530         drp->ch.chunk_length = htons(chk->send_size);
11531         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11532         if (spc < 0) {
11533                 spc = 0;
11534         }
11535         drp->bottle_bw = htonl(spc);
11536         if (asoc->my_rwnd) {
11537                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11538                     asoc->size_on_all_streams +
11539                     asoc->my_rwnd_control_len +
11540                     stcb->sctp_socket->so_rcv.sb_cc);
11541         } else {
11542                 /*-
11543                  * If my rwnd is 0, possibly from mbuf depletion as well as
11544                  * space used, tell the peer there is NO space aka onq == bw
11545                  */
11546                 drp->current_onq = htonl(spc);
11547         }
11548         drp->reserved = 0;
11549         datap = drp->data;
11550         m_copydata(m, iphlen, len, (caddr_t)datap);
11551         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11552         asoc->ctrl_queue_cnt++;
11553 }
11554
11555 void
11556 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11557 {
11558         struct sctp_association *asoc;
11559         struct sctp_cwr_chunk *cwr;
11560         struct sctp_tmit_chunk *chk;
11561
11562         SCTP_TCB_LOCK_ASSERT(stcb);
11563         if (net == NULL) {
11564                 return;
11565         }
11566         asoc = &stcb->asoc;
11567         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11568                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11569                         /*
11570                          * found a previous CWR queued to same destination
11571                          * update it if needed
11572                          */
11573                         uint32_t ctsn;
11574
11575                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11576                         ctsn = ntohl(cwr->tsn);
11577                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11578                                 cwr->tsn = htonl(high_tsn);
11579                         }
11580                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11581                                 /* Make sure override is carried */
11582                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11583                         }
11584                         return;
11585                 }
11586         }
11587         sctp_alloc_a_chunk(stcb, chk);
11588         if (chk == NULL) {
11589                 return;
11590         }
11591         chk->copy_by_ref = 0;
11592         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11593         chk->rec.chunk_id.can_take_data = 1;
11594         chk->flags = 0;
11595         chk->asoc = &stcb->asoc;
11596         chk->send_size = sizeof(struct sctp_cwr_chunk);
11597         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11598         if (chk->data == NULL) {
11599                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11600                 return;
11601         }
11602         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11603         SCTP_BUF_LEN(chk->data) = chk->send_size;
11604         chk->sent = SCTP_DATAGRAM_UNSENT;
11605         chk->snd_count = 0;
11606         chk->whoTo = net;
11607         atomic_add_int(&chk->whoTo->ref_count, 1);
11608         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11609         cwr->ch.chunk_type = SCTP_ECN_CWR;
11610         cwr->ch.chunk_flags = override;
11611         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11612         cwr->tsn = htonl(high_tsn);
11613         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11614         asoc->ctrl_queue_cnt++;
11615 }
11616
11617 static int
11618 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11619     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11620 {
11621         uint16_t len, old_len, i;
11622         struct sctp_stream_reset_out_request *req_out;
11623         struct sctp_chunkhdr *ch;
11624         int at;
11625         int number_entries = 0;
11626
11627         ch = mtod(chk->data, struct sctp_chunkhdr *);
11628         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11629         /* get to new offset for the param. */
11630         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11631         /* now how long will this param be? */
11632         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11633                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11634                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11635                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11636                         number_entries++;
11637                 }
11638         }
11639         if (number_entries == 0) {
11640                 return (0);
11641         }
11642         if (number_entries == stcb->asoc.streamoutcnt) {
11643                 number_entries = 0;
11644         }
11645         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11646                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11647         }
11648         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11649         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11650         req_out->ph.param_length = htons(len);
11651         req_out->request_seq = htonl(seq);
11652         req_out->response_seq = htonl(resp_seq);
11653         req_out->send_reset_at_tsn = htonl(last_sent);
11654         at = 0;
11655         if (number_entries) {
11656                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11657                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11658                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11659                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11660                                 req_out->list_of_streams[at] = htons(i);
11661                                 at++;
11662                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11663                                 if (at >= number_entries) {
11664                                         break;
11665                                 }
11666                         }
11667                 }
11668         } else {
11669                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11670                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11671                 }
11672         }
11673         if (SCTP_SIZE32(len) > len) {
11674                 /*-
11675                  * Need to worry about the pad we may end up adding to the
11676                  * end. This is easy since the struct is either aligned to 4
11677                  * bytes or 2 bytes off.
11678                  */
11679                 req_out->list_of_streams[number_entries] = 0;
11680         }
11681         /* now fix the chunk length */
11682         ch->chunk_length = htons(len + old_len);
11683         chk->book_size = len + old_len;
11684         chk->book_size_scale = 0;
11685         chk->send_size = SCTP_SIZE32(chk->book_size);
11686         SCTP_BUF_LEN(chk->data) = chk->send_size;
11687         return (1);
11688 }
11689
11690 static void
11691 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11692     int number_entries, uint16_t *list,
11693     uint32_t seq)
11694 {
11695         uint16_t len, old_len, i;
11696         struct sctp_stream_reset_in_request *req_in;
11697         struct sctp_chunkhdr *ch;
11698
11699         ch = mtod(chk->data, struct sctp_chunkhdr *);
11700         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11701
11702         /* get to new offset for the param. */
11703         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11704         /* now how long will this param be? */
11705         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11706         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11707         req_in->ph.param_length = htons(len);
11708         req_in->request_seq = htonl(seq);
11709         if (number_entries) {
11710                 for (i = 0; i < number_entries; i++) {
11711                         req_in->list_of_streams[i] = htons(list[i]);
11712                 }
11713         }
11714         if (SCTP_SIZE32(len) > len) {
11715                 /*-
11716                  * Need to worry about the pad we may end up adding to the
11717                  * end. This is easy since the struct is either aligned to 4
11718                  * bytes or 2 bytes off.
11719                  */
11720                 req_in->list_of_streams[number_entries] = 0;
11721         }
11722         /* now fix the chunk length */
11723         ch->chunk_length = htons(len + old_len);
11724         chk->book_size = len + old_len;
11725         chk->book_size_scale = 0;
11726         chk->send_size = SCTP_SIZE32(chk->book_size);
11727         SCTP_BUF_LEN(chk->data) = chk->send_size;
11728         return;
11729 }
11730
11731 static void
11732 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11733     uint32_t seq)
11734 {
11735         uint16_t len, old_len;
11736         struct sctp_stream_reset_tsn_request *req_tsn;
11737         struct sctp_chunkhdr *ch;
11738
11739         ch = mtod(chk->data, struct sctp_chunkhdr *);
11740         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11741
11742         /* get to new offset for the param. */
11743         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11744         /* now how long will this param be? */
11745         len = sizeof(struct sctp_stream_reset_tsn_request);
11746         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11747         req_tsn->ph.param_length = htons(len);
11748         req_tsn->request_seq = htonl(seq);
11749
11750         /* now fix the chunk length */
11751         ch->chunk_length = htons(len + old_len);
11752         chk->send_size = len + old_len;
11753         chk->book_size = SCTP_SIZE32(chk->send_size);
11754         chk->book_size_scale = 0;
11755         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11756         return;
11757 }
11758
11759 void
11760 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11761     uint32_t resp_seq, uint32_t result)
11762 {
11763         uint16_t len, old_len;
11764         struct sctp_stream_reset_response *resp;
11765         struct sctp_chunkhdr *ch;
11766
11767         ch = mtod(chk->data, struct sctp_chunkhdr *);
11768         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11769
11770         /* get to new offset for the param. */
11771         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11772         /* now how long will this param be? */
11773         len = sizeof(struct sctp_stream_reset_response);
11774         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11775         resp->ph.param_length = htons(len);
11776         resp->response_seq = htonl(resp_seq);
11777         resp->result = ntohl(result);
11778
11779         /* now fix the chunk length */
11780         ch->chunk_length = htons(len + old_len);
11781         chk->book_size = len + old_len;
11782         chk->book_size_scale = 0;
11783         chk->send_size = SCTP_SIZE32(chk->book_size);
11784         SCTP_BUF_LEN(chk->data) = chk->send_size;
11785         return;
11786 }
11787
11788 void
11789 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11790     struct sctp_stream_reset_list *ent,
11791     int response)
11792 {
11793         struct sctp_association *asoc;
11794         struct sctp_tmit_chunk *chk;
11795         struct sctp_chunkhdr *ch;
11796
11797         asoc = &stcb->asoc;
11798
11799         /*
11800          * Reset our last reset action to the new one IP -> response
11801          * (PERFORMED probably). This assures that if we fail to send, a
11802          * retran from the peer will get the new response.
11803          */
11804         asoc->last_reset_action[0] = response;
11805         if (asoc->stream_reset_outstanding) {
11806                 return;
11807         }
11808         sctp_alloc_a_chunk(stcb, chk);
11809         if (chk == NULL) {
11810                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11811                 return;
11812         }
11813         chk->copy_by_ref = 0;
11814         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11815         chk->rec.chunk_id.can_take_data = 0;
11816         chk->flags = 0;
11817         chk->asoc = &stcb->asoc;
11818         chk->book_size = sizeof(struct sctp_chunkhdr);
11819         chk->send_size = SCTP_SIZE32(chk->book_size);
11820         chk->book_size_scale = 0;
11821         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11822         if (chk->data == NULL) {
11823                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11824                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11825                 return;
11826         }
11827         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11828         /* setup chunk parameters */
11829         chk->sent = SCTP_DATAGRAM_UNSENT;
11830         chk->snd_count = 0;
11831         if (stcb->asoc.alternate) {
11832                 chk->whoTo = stcb->asoc.alternate;
11833         } else {
11834                 chk->whoTo = stcb->asoc.primary_destination;
11835         }
11836         ch = mtod(chk->data, struct sctp_chunkhdr *);
11837         ch->chunk_type = SCTP_STREAM_RESET;
11838         ch->chunk_flags = 0;
11839         ch->chunk_length = htons(chk->book_size);
11840         atomic_add_int(&chk->whoTo->ref_count, 1);
11841         SCTP_BUF_LEN(chk->data) = chk->send_size;
11842         sctp_add_stream_reset_result(chk, ent->seq, response);
11843         /* insert the chunk for sending */
11844         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11845             chk,
11846             sctp_next);
11847         asoc->ctrl_queue_cnt++;
11848 }
11849
11850 void
11851 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11852     uint32_t resp_seq, uint32_t result,
11853     uint32_t send_una, uint32_t recv_next)
11854 {
11855         uint16_t len, old_len;
11856         struct sctp_stream_reset_response_tsn *resp;
11857         struct sctp_chunkhdr *ch;
11858
11859         ch = mtod(chk->data, struct sctp_chunkhdr *);
11860         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11861
11862         /* get to new offset for the param. */
11863         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11864         /* now how long will this param be? */
11865         len = sizeof(struct sctp_stream_reset_response_tsn);
11866         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11867         resp->ph.param_length = htons(len);
11868         resp->response_seq = htonl(resp_seq);
11869         resp->result = htonl(result);
11870         resp->senders_next_tsn = htonl(send_una);
11871         resp->receivers_next_tsn = htonl(recv_next);
11872
11873         /* now fix the chunk length */
11874         ch->chunk_length = htons(len + old_len);
11875         chk->book_size = len + old_len;
11876         chk->send_size = SCTP_SIZE32(chk->book_size);
11877         chk->book_size_scale = 0;
11878         SCTP_BUF_LEN(chk->data) = chk->send_size;
11879         return;
11880 }
11881
11882 static void
11883 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11884     uint32_t seq,
11885     uint16_t adding)
11886 {
11887         uint16_t len, old_len;
11888         struct sctp_chunkhdr *ch;
11889         struct sctp_stream_reset_add_strm *addstr;
11890
11891         ch = mtod(chk->data, struct sctp_chunkhdr *);
11892         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11893
11894         /* get to new offset for the param. */
11895         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11896         /* now how long will this param be? */
11897         len = sizeof(struct sctp_stream_reset_add_strm);
11898
11899         /* Fill it out. */
11900         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11901         addstr->ph.param_length = htons(len);
11902         addstr->request_seq = htonl(seq);
11903         addstr->number_of_streams = htons(adding);
11904         addstr->reserved = 0;
11905
11906         /* now fix the chunk length */
11907         ch->chunk_length = htons(len + old_len);
11908         chk->send_size = len + old_len;
11909         chk->book_size = SCTP_SIZE32(chk->send_size);
11910         chk->book_size_scale = 0;
11911         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11912         return;
11913 }
11914
11915 static void
11916 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11917     uint32_t seq,
11918     uint16_t adding)
11919 {
11920         uint16_t len, old_len;
11921         struct sctp_chunkhdr *ch;
11922         struct sctp_stream_reset_add_strm *addstr;
11923
11924         ch = mtod(chk->data, struct sctp_chunkhdr *);
11925         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11926
11927         /* get to new offset for the param. */
11928         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11929         /* now how long will this param be? */
11930         len = sizeof(struct sctp_stream_reset_add_strm);
11931         /* Fill it out. */
11932         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11933         addstr->ph.param_length = htons(len);
11934         addstr->request_seq = htonl(seq);
11935         addstr->number_of_streams = htons(adding);
11936         addstr->reserved = 0;
11937
11938         /* now fix the chunk length */
11939         ch->chunk_length = htons(len + old_len);
11940         chk->send_size = len + old_len;
11941         chk->book_size = SCTP_SIZE32(chk->send_size);
11942         chk->book_size_scale = 0;
11943         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11944         return;
11945 }
11946
11947 int
11948 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11949 {
11950         struct sctp_association *asoc;
11951         struct sctp_tmit_chunk *chk;
11952         struct sctp_chunkhdr *ch;
11953         uint32_t seq;
11954
11955         asoc = &stcb->asoc;
11956         asoc->trigger_reset = 0;
11957         if (asoc->stream_reset_outstanding) {
11958                 return (EALREADY);
11959         }
11960         sctp_alloc_a_chunk(stcb, chk);
11961         if (chk == NULL) {
11962                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11963                 return (ENOMEM);
11964         }
11965         chk->copy_by_ref = 0;
11966         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11967         chk->rec.chunk_id.can_take_data = 0;
11968         chk->flags = 0;
11969         chk->asoc = &stcb->asoc;
11970         chk->book_size = sizeof(struct sctp_chunkhdr);
11971         chk->send_size = SCTP_SIZE32(chk->book_size);
11972         chk->book_size_scale = 0;
11973         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11974         if (chk->data == NULL) {
11975                 sctp_free_a_chunk(stcb, chk, so_locked);
11976                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11977                 return (ENOMEM);
11978         }
11979         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11980
11981         /* setup chunk parameters */
11982         chk->sent = SCTP_DATAGRAM_UNSENT;
11983         chk->snd_count = 0;
11984         if (stcb->asoc.alternate) {
11985                 chk->whoTo = stcb->asoc.alternate;
11986         } else {
11987                 chk->whoTo = stcb->asoc.primary_destination;
11988         }
11989         ch = mtod(chk->data, struct sctp_chunkhdr *);
11990         ch->chunk_type = SCTP_STREAM_RESET;
11991         ch->chunk_flags = 0;
11992         ch->chunk_length = htons(chk->book_size);
11993         atomic_add_int(&chk->whoTo->ref_count, 1);
11994         SCTP_BUF_LEN(chk->data) = chk->send_size;
11995         seq = stcb->asoc.str_reset_seq_out;
11996         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11997                 seq++;
11998                 asoc->stream_reset_outstanding++;
11999         } else {
12000                 m_freem(chk->data);
12001                 chk->data = NULL;
12002                 sctp_free_a_chunk(stcb, chk, so_locked);
12003                 return (ENOENT);
12004         }
12005         asoc->str_reset = chk;
12006         /* insert the chunk for sending */
12007         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12008             chk,
12009             sctp_next);
12010         asoc->ctrl_queue_cnt++;
12011
12012         if (stcb->asoc.send_sack) {
12013                 sctp_send_sack(stcb, so_locked);
12014         }
12015         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12016         return (0);
12017 }
12018
12019 int
12020 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12021     uint16_t number_entries, uint16_t *list,
12022     uint8_t send_in_req,
12023     uint8_t send_tsn_req,
12024     uint8_t add_stream,
12025     uint16_t adding_o,
12026     uint16_t adding_i, uint8_t peer_asked)
12027 {
12028         struct sctp_association *asoc;
12029         struct sctp_tmit_chunk *chk;
12030         struct sctp_chunkhdr *ch;
12031         int can_send_out_req = 0;
12032         uint32_t seq;
12033
12034         asoc = &stcb->asoc;
12035         if (asoc->stream_reset_outstanding) {
12036                 /*-
12037                  * Already one pending, must get ACK back to clear the flag.
12038                  */
12039                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12040                 return (EBUSY);
12041         }
12042         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12043             (add_stream == 0)) {
12044                 /* nothing to do */
12045                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12046                 return (EINVAL);
12047         }
12048         if (send_tsn_req && send_in_req) {
12049                 /* error, can't do that */
12050                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12051                 return (EINVAL);
12052         } else if (send_in_req) {
12053                 can_send_out_req = 1;
12054         }
12055         if (number_entries > (MCLBYTES -
12056             SCTP_MIN_OVERHEAD -
12057             sizeof(struct sctp_chunkhdr) -
12058             sizeof(struct sctp_stream_reset_out_request)) /
12059             sizeof(uint16_t)) {
12060                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12061                 return (ENOMEM);
12062         }
12063         sctp_alloc_a_chunk(stcb, chk);
12064         if (chk == NULL) {
12065                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12066                 return (ENOMEM);
12067         }
12068         chk->copy_by_ref = 0;
12069         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12070         chk->rec.chunk_id.can_take_data = 0;
12071         chk->flags = 0;
12072         chk->asoc = &stcb->asoc;
12073         chk->book_size = sizeof(struct sctp_chunkhdr);
12074         chk->send_size = SCTP_SIZE32(chk->book_size);
12075         chk->book_size_scale = 0;
12076         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12077         if (chk->data == NULL) {
12078                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12079                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12080                 return (ENOMEM);
12081         }
12082         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12083
12084         /* setup chunk parameters */
12085         chk->sent = SCTP_DATAGRAM_UNSENT;
12086         chk->snd_count = 0;
12087         if (stcb->asoc.alternate) {
12088                 chk->whoTo = stcb->asoc.alternate;
12089         } else {
12090                 chk->whoTo = stcb->asoc.primary_destination;
12091         }
12092         atomic_add_int(&chk->whoTo->ref_count, 1);
12093         ch = mtod(chk->data, struct sctp_chunkhdr *);
12094         ch->chunk_type = SCTP_STREAM_RESET;
12095         ch->chunk_flags = 0;
12096         ch->chunk_length = htons(chk->book_size);
12097         SCTP_BUF_LEN(chk->data) = chk->send_size;
12098
12099         seq = stcb->asoc.str_reset_seq_out;
12100         if (can_send_out_req) {
12101                 int ret;
12102
12103                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12104                 if (ret) {
12105                         seq++;
12106                         asoc->stream_reset_outstanding++;
12107                 }
12108         }
12109         if ((add_stream & 1) &&
12110             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12111                 /* Need to allocate more */
12112                 struct sctp_stream_out *oldstream;
12113                 struct sctp_stream_queue_pending *sp, *nsp;
12114                 int i;
12115 #if defined(SCTP_DETAILED_STR_STATS)
12116                 int j;
12117 #endif
12118
12119                 oldstream = stcb->asoc.strmout;
12120                 /* get some more */
12121                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12122                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12123                     SCTP_M_STRMO);
12124                 if (stcb->asoc.strmout == NULL) {
12125                         uint8_t x;
12126
12127                         stcb->asoc.strmout = oldstream;
12128                         /* Turn off the bit */
12129                         x = add_stream & 0xfe;
12130                         add_stream = x;
12131                         goto skip_stuff;
12132                 }
12133                 /*
12134                  * Ok now we proceed with copying the old out stuff and
12135                  * initializing the new stuff.
12136                  */
12137                 SCTP_TCB_SEND_LOCK(stcb);
12138                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12139                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12140                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12141                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12142                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12143                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12144                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12145                         stcb->asoc.strmout[i].sid = i;
12146                         stcb->asoc.strmout[i].state = oldstream[i].state;
12147                         /* FIX ME FIX ME */
12148                         /*
12149                          * This should be a SS_COPY operation FIX ME STREAM
12150                          * SCHEDULER EXPERT
12151                          */
12152                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12153                         /* now anything on those queues? */
12154                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12155                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12156                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12157                         }
12158                 }
12159                 /* now the new streams */
12160                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12161                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12162                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12163                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12164 #if defined(SCTP_DETAILED_STR_STATS)
12165                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12166                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12167                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12168                         }
12169 #else
12170                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12171                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12172 #endif
12173                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12174                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12175                         stcb->asoc.strmout[i].sid = i;
12176                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12177                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12178                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12179                 }
12180                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12181                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12182                 SCTP_TCB_SEND_UNLOCK(stcb);
12183         }
12184 skip_stuff:
12185         if ((add_stream & 1) && (adding_o > 0)) {
12186                 asoc->strm_pending_add_size = adding_o;
12187                 asoc->peer_req_out = peer_asked;
12188                 sctp_add_an_out_stream(chk, seq, adding_o);
12189                 seq++;
12190                 asoc->stream_reset_outstanding++;
12191         }
12192         if ((add_stream & 2) && (adding_i > 0)) {
12193                 sctp_add_an_in_stream(chk, seq, adding_i);
12194                 seq++;
12195                 asoc->stream_reset_outstanding++;
12196         }
12197         if (send_in_req) {
12198                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12199                 seq++;
12200                 asoc->stream_reset_outstanding++;
12201         }
12202         if (send_tsn_req) {
12203                 sctp_add_stream_reset_tsn(chk, seq);
12204                 asoc->stream_reset_outstanding++;
12205         }
12206         asoc->str_reset = chk;
12207         /* insert the chunk for sending */
12208         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12209             chk,
12210             sctp_next);
12211         asoc->ctrl_queue_cnt++;
12212         if (stcb->asoc.send_sack) {
12213                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12214         }
12215         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12216         return (0);
12217 }
12218
12219 void
12220 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12221     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12222     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12223     uint32_t vrf_id, uint16_t port)
12224 {
12225         /* Don't respond to an ABORT with an ABORT. */
12226         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12227                 if (cause)
12228                         sctp_m_freem(cause);
12229                 return;
12230         }
12231         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12232             mflowtype, mflowid, fibnum,
12233             vrf_id, port);
12234         return;
12235 }
12236
12237 void
12238 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12239     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12240     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12241     uint32_t vrf_id, uint16_t port)
12242 {
12243         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12244             mflowtype, mflowid, fibnum,
12245             vrf_id, port);
12246         return;
12247 }
12248
12249 static struct mbuf *
12250 sctp_copy_resume(struct uio *uio,
12251     int max_send_len,
12252     int user_marks_eor,
12253     int *error,
12254     uint32_t *sndout,
12255     struct mbuf **new_tail)
12256 {
12257         struct mbuf *m;
12258
12259         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12260             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12261         if (m == NULL) {
12262                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12263                 *error = ENOBUFS;
12264         } else {
12265                 *sndout = m_length(m, NULL);
12266                 *new_tail = m_last(m);
12267         }
12268         return (m);
12269 }
12270
12271 static int
12272 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12273     struct uio *uio,
12274     int resv_upfront)
12275 {
12276         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12277             resv_upfront, 0);
12278         if (sp->data == NULL) {
12279                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12280                 return (ENOBUFS);
12281         }
12282
12283         sp->tail_mbuf = m_last(sp->data);
12284         return (0);
12285 }
12286
12287 static struct sctp_stream_queue_pending *
12288 sctp_copy_it_in(struct sctp_tcb *stcb,
12289     struct sctp_association *asoc,
12290     struct sctp_sndrcvinfo *srcv,
12291     struct uio *uio,
12292     struct sctp_nets *net,
12293     ssize_t max_send_len,
12294     int user_marks_eor,
12295     int *error)
12296 {
12297
12298         /*-
12299          * This routine must be very careful in its work. Protocol
12300          * processing is up and running so care must be taken to spl...()
12301          * when you need to do something that may effect the stcb/asoc. The
12302          * sb is locked however. When data is copied the protocol processing
12303          * should be enabled since this is a slower operation...
12304          */
12305         struct sctp_stream_queue_pending *sp = NULL;
12306         int resv_in_first;
12307
12308         *error = 0;
12309         /* Now can we send this? */
12310         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12311             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12312             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12313             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12314                 /* got data while shutting down */
12315                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12316                 *error = ECONNRESET;
12317                 goto out_now;
12318         }
12319         sctp_alloc_a_strmoq(stcb, sp);
12320         if (sp == NULL) {
12321                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12322                 *error = ENOMEM;
12323                 goto out_now;
12324         }
12325         sp->act_flags = 0;
12326         sp->sender_all_done = 0;
12327         sp->sinfo_flags = srcv->sinfo_flags;
12328         sp->timetolive = srcv->sinfo_timetolive;
12329         sp->ppid = srcv->sinfo_ppid;
12330         sp->context = srcv->sinfo_context;
12331         sp->fsn = 0;
12332         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12333
12334         sp->sid = srcv->sinfo_stream;
12335         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12336         if ((sp->length == (uint32_t)uio->uio_resid) &&
12337             ((user_marks_eor == 0) ||
12338             (srcv->sinfo_flags & SCTP_EOF) ||
12339             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12340                 sp->msg_is_complete = 1;
12341         } else {
12342                 sp->msg_is_complete = 0;
12343         }
12344         sp->sender_all_done = 0;
12345         sp->some_taken = 0;
12346         sp->put_last_out = 0;
12347         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12348         sp->data = sp->tail_mbuf = NULL;
12349         if (sp->length == 0) {
12350                 goto skip_copy;
12351         }
12352         if (srcv->sinfo_keynumber_valid) {
12353                 sp->auth_keyid = srcv->sinfo_keynumber;
12354         } else {
12355                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12356         }
12357         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12358                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12359                 sp->holds_key_ref = 1;
12360         }
12361         *error = sctp_copy_one(sp, uio, resv_in_first);
12362 skip_copy:
12363         if (*error) {
12364                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12365                 sp = NULL;
12366         } else {
12367                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12368                         sp->net = net;
12369                         atomic_add_int(&sp->net->ref_count, 1);
12370                 } else {
12371                         sp->net = NULL;
12372                 }
12373                 sctp_set_prsctp_policy(sp);
12374         }
12375 out_now:
12376         return (sp);
12377 }
12378
12379 int
12380 sctp_sosend(struct socket *so,
12381     struct sockaddr *addr,
12382     struct uio *uio,
12383     struct mbuf *top,
12384     struct mbuf *control,
12385     int flags,
12386     struct thread *p
12387 )
12388 {
12389         int error, use_sndinfo = 0;
12390         struct sctp_sndrcvinfo sndrcvninfo;
12391         struct sockaddr *addr_to_use;
12392 #if defined(INET) && defined(INET6)
12393         struct sockaddr_in sin;
12394 #endif
12395
12396         if (control) {
12397                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12398                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12399                     sizeof(sndrcvninfo))) {
12400                         /* got one */
12401                         use_sndinfo = 1;
12402                 }
12403         }
12404         addr_to_use = addr;
12405 #if defined(INET) && defined(INET6)
12406         if ((addr) && (addr->sa_family == AF_INET6)) {
12407                 struct sockaddr_in6 *sin6;
12408
12409                 sin6 = (struct sockaddr_in6 *)addr;
12410                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12411                         in6_sin6_2_sin(&sin, sin6);
12412                         addr_to_use = (struct sockaddr *)&sin;
12413                 }
12414         }
12415 #endif
12416         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12417             control,
12418             flags,
12419             use_sndinfo ? &sndrcvninfo : NULL
12420             ,p
12421             );
12422         return (error);
12423 }
12424
12425 int
12426 sctp_lower_sosend(struct socket *so,
12427     struct sockaddr *addr,
12428     struct uio *uio,
12429     struct mbuf *i_pak,
12430     struct mbuf *control,
12431     int flags,
12432     struct sctp_sndrcvinfo *srcv
12433     ,
12434     struct thread *p
12435 )
12436 {
12437         struct epoch_tracker et;
12438         ssize_t sndlen = 0, max_len, local_add_more;
12439         int error, len;
12440         struct mbuf *top = NULL;
12441         int queue_only = 0, queue_only_for_init = 0;
12442         int free_cnt_applied = 0;
12443         int un_sent;
12444         int now_filled = 0;
12445         unsigned int inqueue_bytes = 0;
12446         struct sctp_block_entry be;
12447         struct sctp_inpcb *inp;
12448         struct sctp_tcb *stcb = NULL;
12449         struct timeval now;
12450         struct sctp_nets *net;
12451         struct sctp_association *asoc;
12452         struct sctp_inpcb *t_inp;
12453         int user_marks_eor;
12454         int create_lock_applied = 0;
12455         int nagle_applies = 0;
12456         int some_on_control = 0;
12457         int got_all_of_the_send = 0;
12458         int hold_tcblock = 0;
12459         int non_blocking = 0;
12460         ssize_t local_soresv = 0;
12461         uint16_t port;
12462         uint16_t sinfo_flags;
12463         sctp_assoc_t sinfo_assoc_id;
12464
12465         error = 0;
12466         net = NULL;
12467         stcb = NULL;
12468         asoc = NULL;
12469
12470         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12471         if (inp == NULL) {
12472                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12473                 error = EINVAL;
12474                 if (i_pak) {
12475                         SCTP_RELEASE_PKT(i_pak);
12476                 }
12477                 return (error);
12478         }
12479         if ((uio == NULL) && (i_pak == NULL)) {
12480                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12481                 return (EINVAL);
12482         }
12483         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12484         atomic_add_int(&inp->total_sends, 1);
12485         if (uio) {
12486                 if (uio->uio_resid < 0) {
12487                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12488                         return (EINVAL);
12489                 }
12490                 sndlen = uio->uio_resid;
12491         } else {
12492                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12493                 sndlen = SCTP_HEADER_LEN(i_pak);
12494         }
12495         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12496             (void *)addr,
12497             sndlen);
12498         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12499             SCTP_IS_LISTENING(inp)) {
12500                 /* The listener can NOT send */
12501                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12502                 error = ENOTCONN;
12503                 goto out_unlocked;
12504         }
12505         /**
12506          * Pre-screen address, if one is given the sin-len
12507          * must be set correctly!
12508          */
12509         if (addr) {
12510                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12511
12512                 switch (raddr->sa.sa_family) {
12513 #ifdef INET
12514                 case AF_INET:
12515                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12516                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12517                                 error = EINVAL;
12518                                 goto out_unlocked;
12519                         }
12520                         port = raddr->sin.sin_port;
12521                         break;
12522 #endif
12523 #ifdef INET6
12524                 case AF_INET6:
12525                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12526                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12527                                 error = EINVAL;
12528                                 goto out_unlocked;
12529                         }
12530                         port = raddr->sin6.sin6_port;
12531                         break;
12532 #endif
12533                 default:
12534                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12535                         error = EAFNOSUPPORT;
12536                         goto out_unlocked;
12537                 }
12538         } else
12539                 port = 0;
12540
12541         if (srcv) {
12542                 sinfo_flags = srcv->sinfo_flags;
12543                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12544                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12545                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12546                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12547                         error = EINVAL;
12548                         goto out_unlocked;
12549                 }
12550                 if (srcv->sinfo_flags)
12551                         SCTP_STAT_INCR(sctps_sends_with_flags);
12552         } else {
12553                 sinfo_flags = inp->def_send.sinfo_flags;
12554                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12555         }
12556         if (flags & MSG_EOR) {
12557                 sinfo_flags |= SCTP_EOR;
12558         }
12559         if (flags & MSG_EOF) {
12560                 sinfo_flags |= SCTP_EOF;
12561         }
12562         if (sinfo_flags & SCTP_SENDALL) {
12563                 /* its a sendall */
12564                 error = sctp_sendall(inp, uio, top, srcv);
12565                 top = NULL;
12566                 goto out_unlocked;
12567         }
12568         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12569                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12570                 error = EINVAL;
12571                 goto out_unlocked;
12572         }
12573         /* now we must find the assoc */
12574         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12575             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12576                 SCTP_INP_RLOCK(inp);
12577                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12578                 if (stcb) {
12579                         SCTP_TCB_LOCK(stcb);
12580                         hold_tcblock = 1;
12581                 }
12582                 SCTP_INP_RUNLOCK(inp);
12583         } else if (sinfo_assoc_id) {
12584                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12585                 if (stcb != NULL) {
12586                         hold_tcblock = 1;
12587                 }
12588         } else if (addr) {
12589                 /*-
12590                  * Since we did not use findep we must
12591                  * increment it, and if we don't find a tcb
12592                  * decrement it.
12593                  */
12594                 SCTP_INP_WLOCK(inp);
12595                 SCTP_INP_INCR_REF(inp);
12596                 SCTP_INP_WUNLOCK(inp);
12597                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12598                 if (stcb == NULL) {
12599                         SCTP_INP_WLOCK(inp);
12600                         SCTP_INP_DECR_REF(inp);
12601                         SCTP_INP_WUNLOCK(inp);
12602                 } else {
12603                         hold_tcblock = 1;
12604                 }
12605         }
12606         if ((stcb == NULL) && (addr)) {
12607                 /* Possible implicit send? */
12608                 SCTP_ASOC_CREATE_LOCK(inp);
12609                 create_lock_applied = 1;
12610                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12611                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12612                         /* Should I really unlock ? */
12613                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12614                         error = EINVAL;
12615                         goto out_unlocked;
12616                 }
12617                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12618                     (addr->sa_family == AF_INET6)) {
12619                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12620                         error = EINVAL;
12621                         goto out_unlocked;
12622                 }
12623                 SCTP_INP_WLOCK(inp);
12624                 SCTP_INP_INCR_REF(inp);
12625                 SCTP_INP_WUNLOCK(inp);
12626                 /* With the lock applied look again */
12627                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12628 #if defined(INET) || defined(INET6)
12629                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12630                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12631                 }
12632 #endif
12633                 if (stcb == NULL) {
12634                         SCTP_INP_WLOCK(inp);
12635                         SCTP_INP_DECR_REF(inp);
12636                         SCTP_INP_WUNLOCK(inp);
12637                 } else {
12638                         hold_tcblock = 1;
12639                 }
12640                 if (error) {
12641                         goto out_unlocked;
12642                 }
12643                 if (t_inp != inp) {
12644                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12645                         error = ENOTCONN;
12646                         goto out_unlocked;
12647                 }
12648         }
12649         if (stcb == NULL) {
12650                 if (addr == NULL) {
12651                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12652                         error = ENOENT;
12653                         goto out_unlocked;
12654                 } else {
12655                         /* We must go ahead and start the INIT process */
12656                         uint32_t vrf_id;
12657
12658                         if ((sinfo_flags & SCTP_ABORT) ||
12659                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12660                                 /*-
12661                                  * User asks to abort a non-existant assoc,
12662                                  * or EOF a non-existant assoc with no data
12663                                  */
12664                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12665                                 error = ENOENT;
12666                                 goto out_unlocked;
12667                         }
12668                         /* get an asoc/stcb struct */
12669                         vrf_id = inp->def_vrf_id;
12670 #ifdef INVARIANTS
12671                         if (create_lock_applied == 0) {
12672                                 panic("Error, should hold create lock and I don't?");
12673                         }
12674 #endif
12675                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12676                             inp->sctp_ep.pre_open_stream_count,
12677                             inp->sctp_ep.port,
12678                             p,
12679                             SCTP_INITIALIZE_AUTH_PARAMS);
12680                         if (stcb == NULL) {
12681                                 /* Error is setup for us in the call */
12682                                 goto out_unlocked;
12683                         }
12684                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12685                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12686                                 /*
12687                                  * Set the connected flag so we can queue
12688                                  * data
12689                                  */
12690                                 soisconnecting(so);
12691                         }
12692                         hold_tcblock = 1;
12693                         if (create_lock_applied) {
12694                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12695                                 create_lock_applied = 0;
12696                         } else {
12697                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12698                         }
12699                         /*
12700                          * Turn on queue only flag to prevent data from
12701                          * being sent
12702                          */
12703                         queue_only = 1;
12704                         asoc = &stcb->asoc;
12705                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12706                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12707
12708                         if (control) {
12709                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12710                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12711                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12712                                         hold_tcblock = 0;
12713                                         stcb = NULL;
12714                                         goto out_unlocked;
12715                                 }
12716                         }
12717                         /* out with the INIT */
12718                         queue_only_for_init = 1;
12719                         /*-
12720                          * we may want to dig in after this call and adjust the MTU
12721                          * value. It defaulted to 1500 (constant) but the ro
12722                          * structure may now have an update and thus we may need to
12723                          * change it BEFORE we append the message.
12724                          */
12725                 }
12726         } else
12727                 asoc = &stcb->asoc;
12728         if (srcv == NULL) {
12729                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12730                 sinfo_flags = srcv->sinfo_flags;
12731                 if (flags & MSG_EOR) {
12732                         sinfo_flags |= SCTP_EOR;
12733                 }
12734                 if (flags & MSG_EOF) {
12735                         sinfo_flags |= SCTP_EOF;
12736                 }
12737         }
12738         if (sinfo_flags & SCTP_ADDR_OVER) {
12739                 if (addr)
12740                         net = sctp_findnet(stcb, addr);
12741                 else
12742                         net = NULL;
12743                 if ((net == NULL) ||
12744                     ((port != 0) && (port != stcb->rport))) {
12745                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12746                         error = EINVAL;
12747                         goto out_unlocked;
12748                 }
12749         } else {
12750                 if (stcb->asoc.alternate) {
12751                         net = stcb->asoc.alternate;
12752                 } else {
12753                         net = stcb->asoc.primary_destination;
12754                 }
12755         }
12756         atomic_add_int(&stcb->total_sends, 1);
12757         /* Keep the stcb from being freed under our feet */
12758         atomic_add_int(&asoc->refcnt, 1);
12759         free_cnt_applied = 1;
12760
12761         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12762                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12763                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12764                         error = EMSGSIZE;
12765                         goto out_unlocked;
12766                 }
12767         }
12768         if (SCTP_SO_IS_NBIO(so)
12769             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12770             ) {
12771                 non_blocking = 1;
12772         }
12773         /* would we block? */
12774         if (non_blocking) {
12775                 ssize_t amount;
12776
12777                 if (hold_tcblock == 0) {
12778                         SCTP_TCB_LOCK(stcb);
12779                         hold_tcblock = 1;
12780                 }
12781                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12782                 if (user_marks_eor == 0) {
12783                         amount = sndlen;
12784                 } else {
12785                         amount = 1;
12786                 }
12787                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12788                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12789                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12790                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12791                                 error = EMSGSIZE;
12792                         else
12793                                 error = EWOULDBLOCK;
12794                         goto out_unlocked;
12795                 }
12796                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12797                 SCTP_TCB_UNLOCK(stcb);
12798                 hold_tcblock = 0;
12799         } else {
12800                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12801         }
12802         local_soresv = sndlen;
12803         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12804                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12805                 error = ECONNRESET;
12806                 goto out_unlocked;
12807         }
12808         if (create_lock_applied) {
12809                 SCTP_ASOC_CREATE_UNLOCK(inp);
12810                 create_lock_applied = 0;
12811         }
12812         /* Is the stream no. valid? */
12813         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12814                 /* Invalid stream number */
12815                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12816                 error = EINVAL;
12817                 goto out_unlocked;
12818         }
12819         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12820             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12821                 /*
12822                  * Can't queue any data while stream reset is underway.
12823                  */
12824                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12825                         error = EAGAIN;
12826                 } else {
12827                         error = EINVAL;
12828                 }
12829                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12830                 goto out_unlocked;
12831         }
12832         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12833             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12834                 queue_only = 1;
12835         }
12836         /* we are now done with all control */
12837         if (control) {
12838                 sctp_m_freem(control);
12839                 control = NULL;
12840         }
12841         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12842             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12843             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12844             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12845                 if (sinfo_flags & SCTP_ABORT) {
12846                         ;
12847                 } else {
12848                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12849                         error = ECONNRESET;
12850                         goto out_unlocked;
12851                 }
12852         }
12853         /* Ok, we will attempt a msgsnd :> */
12854         if (p) {
12855                 p->td_ru.ru_msgsnd++;
12856         }
12857         /* Are we aborting? */
12858         if (sinfo_flags & SCTP_ABORT) {
12859                 struct mbuf *mm;
12860                 ssize_t tot_demand, tot_out = 0, max_out;
12861
12862                 SCTP_STAT_INCR(sctps_sends_with_abort);
12863                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12864                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12865                         /* It has to be up before we abort */
12866                         /* how big is the user initiated abort? */
12867                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12868                         error = EINVAL;
12869                         goto out;
12870                 }
12871                 if (hold_tcblock) {
12872                         SCTP_TCB_UNLOCK(stcb);
12873                         hold_tcblock = 0;
12874                 }
12875                 if (top) {
12876                         struct mbuf *cntm = NULL;
12877
12878                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12879                         if (sndlen != 0) {
12880                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12881                                         tot_out += SCTP_BUF_LEN(cntm);
12882                                 }
12883                         }
12884                 } else {
12885                         /* Must fit in a MTU */
12886                         tot_out = sndlen;
12887                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12888                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12889                                 /* To big */
12890                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12891                                 error = EMSGSIZE;
12892                                 goto out;
12893                         }
12894                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12895                 }
12896                 if (mm == NULL) {
12897                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12898                         error = ENOMEM;
12899                         goto out;
12900                 }
12901                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12902                 max_out -= sizeof(struct sctp_abort_msg);
12903                 if (tot_out > max_out) {
12904                         tot_out = max_out;
12905                 }
12906                 if (mm) {
12907                         struct sctp_paramhdr *ph;
12908
12909                         /* now move forward the data pointer */
12910                         ph = mtod(mm, struct sctp_paramhdr *);
12911                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12912                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12913                         ph++;
12914                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12915                         if (top == NULL) {
12916                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12917                                 if (error) {
12918                                         /*-
12919                                          * Here if we can't get his data we
12920                                          * still abort we just don't get to
12921                                          * send the users note :-0
12922                                          */
12923                                         sctp_m_freem(mm);
12924                                         mm = NULL;
12925                                 }
12926                         } else {
12927                                 if (sndlen != 0) {
12928                                         SCTP_BUF_NEXT(mm) = top;
12929                                 }
12930                         }
12931                 }
12932                 if (hold_tcblock == 0) {
12933                         SCTP_TCB_LOCK(stcb);
12934                 }
12935                 atomic_add_int(&stcb->asoc.refcnt, -1);
12936                 free_cnt_applied = 0;
12937                 /* release this lock, otherwise we hang on ourselves */
12938                 NET_EPOCH_ENTER(et);
12939                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12940                 NET_EPOCH_EXIT(et);
12941                 /* now relock the stcb so everything is sane */
12942                 hold_tcblock = 0;
12943                 stcb = NULL;
12944                 /*
12945                  * In this case top is already chained to mm avoid double
12946                  * free, since we free it below if top != NULL and driver
12947                  * would free it after sending the packet out
12948                  */
12949                 if (sndlen != 0) {
12950                         top = NULL;
12951                 }
12952                 goto out_unlocked;
12953         }
12954         /* Calculate the maximum we can send */
12955         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12956         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12957                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12958         } else {
12959                 max_len = 0;
12960         }
12961         if (hold_tcblock) {
12962                 SCTP_TCB_UNLOCK(stcb);
12963                 hold_tcblock = 0;
12964         }
12965         if (asoc->strmout == NULL) {
12966                 /* huh? software error */
12967                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12968                 error = EFAULT;
12969                 goto out_unlocked;
12970         }
12971
12972         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12973         if ((user_marks_eor == 0) &&
12974             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12975                 /* It will NEVER fit */
12976                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12977                 error = EMSGSIZE;
12978                 goto out_unlocked;
12979         }
12980         if ((uio == NULL) && user_marks_eor) {
12981                 /*-
12982                  * We do not support eeor mode for
12983                  * sending with mbuf chains (like sendfile).
12984                  */
12985                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12986                 error = EINVAL;
12987                 goto out_unlocked;
12988         }
12989
12990         if (user_marks_eor) {
12991                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12992         } else {
12993                 /*-
12994                  * For non-eeor the whole message must fit in
12995                  * the socket send buffer.
12996                  */
12997                 local_add_more = sndlen;
12998         }
12999         len = 0;
13000         if (non_blocking) {
13001                 goto skip_preblock;
13002         }
13003         if (((max_len <= local_add_more) &&
13004             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13005             (max_len == 0) ||
13006             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13007                 /* No room right now ! */
13008                 SOCKBUF_LOCK(&so->so_snd);
13009                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13010                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13011                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13012                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13013                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13014                             inqueue_bytes,
13015                             local_add_more,
13016                             stcb->asoc.stream_queue_cnt,
13017                             stcb->asoc.chunks_on_out_queue,
13018                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13019                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13020                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13021                         }
13022                         be.error = 0;
13023                         stcb->block_entry = &be;
13024                         error = sbwait(&so->so_snd);
13025                         stcb->block_entry = NULL;
13026                         if (error || so->so_error || be.error) {
13027                                 if (error == 0) {
13028                                         if (so->so_error)
13029                                                 error = so->so_error;
13030                                         if (be.error) {
13031                                                 error = be.error;
13032                                         }
13033                                 }
13034                                 SOCKBUF_UNLOCK(&so->so_snd);
13035                                 goto out_unlocked;
13036                         }
13037                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13038                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13039                                     asoc, stcb->asoc.total_output_queue_size);
13040                         }
13041                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13042                                 SOCKBUF_UNLOCK(&so->so_snd);
13043                                 goto out_unlocked;
13044                         }
13045                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13046                 }
13047                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13048                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13049                 } else {
13050                         max_len = 0;
13051                 }
13052                 SOCKBUF_UNLOCK(&so->so_snd);
13053         }
13054
13055 skip_preblock:
13056         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13057                 goto out_unlocked;
13058         }
13059         /*
13060          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13061          * case NOTE: uio will be null when top/mbuf is passed
13062          */
13063         if (sndlen == 0) {
13064                 if (sinfo_flags & SCTP_EOF) {
13065                         got_all_of_the_send = 1;
13066                         goto dataless_eof;
13067                 } else {
13068                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13069                         error = EINVAL;
13070                         goto out;
13071                 }
13072         }
13073         if (top == NULL) {
13074                 struct sctp_stream_queue_pending *sp;
13075                 struct sctp_stream_out *strm;
13076                 uint32_t sndout;
13077
13078                 SCTP_TCB_SEND_LOCK(stcb);
13079                 if ((asoc->stream_locked) &&
13080                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13081                         SCTP_TCB_SEND_UNLOCK(stcb);
13082                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13083                         error = EINVAL;
13084                         goto out;
13085                 }
13086                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13087                 if (strm->last_msg_incomplete == 0) {
13088         do_a_copy_in:
13089                         SCTP_TCB_SEND_UNLOCK(stcb);
13090                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13091                         if (error) {
13092                                 goto out;
13093                         }
13094                         SCTP_TCB_SEND_LOCK(stcb);
13095                         if (sp->msg_is_complete) {
13096                                 strm->last_msg_incomplete = 0;
13097                                 asoc->stream_locked = 0;
13098                         } else {
13099                                 /*
13100                                  * Just got locked to this guy in case of an
13101                                  * interrupt.
13102                                  */
13103                                 strm->last_msg_incomplete = 1;
13104                                 if (stcb->asoc.idata_supported == 0) {
13105                                         asoc->stream_locked = 1;
13106                                         asoc->stream_locked_on = srcv->sinfo_stream;
13107                                 }
13108                                 sp->sender_all_done = 0;
13109                         }
13110                         sctp_snd_sb_alloc(stcb, sp->length);
13111                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13112                         if (sinfo_flags & SCTP_UNORDERED) {
13113                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13114                         }
13115                         sp->processing = 1;
13116                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13117                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13118                 } else {
13119                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13120                         if (sp == NULL) {
13121                                 /* ???? Huh ??? last msg is gone */
13122 #ifdef INVARIANTS
13123                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13124 #else
13125                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13126                                 strm->last_msg_incomplete = 0;
13127 #endif
13128                                 goto do_a_copy_in;
13129                         }
13130                         if (sp->processing) {
13131                                 SCTP_TCB_SEND_UNLOCK(stcb);
13132                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13133                                 error = EINVAL;
13134                                 goto out;
13135                         } else {
13136                                 sp->processing = 1;
13137                         }
13138                 }
13139                 SCTP_TCB_SEND_UNLOCK(stcb);
13140                 while (uio->uio_resid > 0) {
13141                         /* How much room do we have? */
13142                         struct mbuf *new_tail, *mm;
13143
13144                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13145                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13146                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13147                         else
13148                                 max_len = 0;
13149
13150                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13151                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13152                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13153                                 sndout = 0;
13154                                 new_tail = NULL;
13155                                 if (hold_tcblock) {
13156                                         SCTP_TCB_UNLOCK(stcb);
13157                                         hold_tcblock = 0;
13158                                 }
13159                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13160                                 if ((mm == NULL) || error) {
13161                                         if (mm) {
13162                                                 sctp_m_freem(mm);
13163                                         }
13164                                         SCTP_TCB_SEND_LOCK(stcb);
13165                                         if (sp != NULL) {
13166                                                 sp->processing = 0;
13167                                         }
13168                                         SCTP_TCB_SEND_UNLOCK(stcb);
13169                                         goto out;
13170                                 }
13171                                 /* Update the mbuf and count */
13172                                 SCTP_TCB_SEND_LOCK(stcb);
13173                                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13174                                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13175                                         /*
13176                                          * we need to get out. Peer probably
13177                                          * aborted.
13178                                          */
13179                                         sctp_m_freem(mm);
13180                                         if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) {
13181                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13182                                                 error = ECONNRESET;
13183                                         }
13184                                         if (sp != NULL) {
13185                                                 sp->processing = 0;
13186                                         }
13187                                         SCTP_TCB_SEND_UNLOCK(stcb);
13188                                         goto out;
13189                                 }
13190                                 if (sp->tail_mbuf) {
13191                                         /* tack it to the end */
13192                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13193                                         sp->tail_mbuf = new_tail;
13194                                 } else {
13195                                         /* A stolen mbuf */
13196                                         sp->data = mm;
13197                                         sp->tail_mbuf = new_tail;
13198                                 }
13199                                 sctp_snd_sb_alloc(stcb, sndout);
13200                                 atomic_add_int(&sp->length, sndout);
13201                                 len += sndout;
13202                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13203                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13204                                 }
13205
13206                                 /* Did we reach EOR? */
13207                                 if ((uio->uio_resid == 0) &&
13208                                     ((user_marks_eor == 0) ||
13209                                     (sinfo_flags & SCTP_EOF) ||
13210                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13211                                         sp->msg_is_complete = 1;
13212                                 } else {
13213                                         sp->msg_is_complete = 0;
13214                                 }
13215                                 SCTP_TCB_SEND_UNLOCK(stcb);
13216                         }
13217                         if (uio->uio_resid == 0) {
13218                                 /* got it all? */
13219                                 continue;
13220                         }
13221                         /* PR-SCTP? */
13222                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13223                                 /*
13224                                  * This is ugly but we must assure locking
13225                                  * order
13226                                  */
13227                                 if (hold_tcblock == 0) {
13228                                         SCTP_TCB_LOCK(stcb);
13229                                         hold_tcblock = 1;
13230                                 }
13231                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13232                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13233                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13234                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13235                                 else
13236                                         max_len = 0;
13237                                 if (max_len > 0) {
13238                                         continue;
13239                                 }
13240                                 SCTP_TCB_UNLOCK(stcb);
13241                                 hold_tcblock = 0;
13242                         }
13243                         /* wait for space now */
13244                         if (non_blocking) {
13245                                 /* Non-blocking io in place out */
13246                                 SCTP_TCB_SEND_LOCK(stcb);
13247                                 if (sp != NULL) {
13248                                         sp->processing = 0;
13249                                 }
13250                                 SCTP_TCB_SEND_UNLOCK(stcb);
13251                                 goto skip_out_eof;
13252                         }
13253                         /* What about the INIT, send it maybe */
13254                         if (queue_only_for_init) {
13255                                 if (hold_tcblock == 0) {
13256                                         SCTP_TCB_LOCK(stcb);
13257                                         hold_tcblock = 1;
13258                                 }
13259                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13260                                         /* a collision took us forward? */
13261                                         queue_only = 0;
13262                                 } else {
13263                                         NET_EPOCH_ENTER(et);
13264                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13265                                         NET_EPOCH_EXIT(et);
13266                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13267                                         queue_only = 1;
13268                                 }
13269                         }
13270                         if ((net->flight_size > net->cwnd) &&
13271                             (asoc->sctp_cmt_on_off == 0)) {
13272                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13273                                 queue_only = 1;
13274                         } else if (asoc->ifp_had_enobuf) {
13275                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13276                                 if (net->flight_size > (2 * net->mtu)) {
13277                                         queue_only = 1;
13278                                 }
13279                                 asoc->ifp_had_enobuf = 0;
13280                         }
13281                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13282                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13283                             (stcb->asoc.total_flight > 0) &&
13284                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13285                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13286                                 /*-
13287                                  * Ok, Nagle is set on and we have data outstanding.
13288                                  * Don't send anything and let SACKs drive out the
13289                                  * data unless we have a "full" segment to send.
13290                                  */
13291                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13292                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13293                                 }
13294                                 SCTP_STAT_INCR(sctps_naglequeued);
13295                                 nagle_applies = 1;
13296                         } else {
13297                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13298                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13299                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13300                                 }
13301                                 SCTP_STAT_INCR(sctps_naglesent);
13302                                 nagle_applies = 0;
13303                         }
13304                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13305                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13306                                     nagle_applies, un_sent);
13307                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13308                                     stcb->asoc.total_flight,
13309                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13310                         }
13311                         if (queue_only_for_init)
13312                                 queue_only_for_init = 0;
13313                         if ((queue_only == 0) && (nagle_applies == 0)) {
13314                                 /*-
13315                                  * need to start chunk output
13316                                  * before blocking.. note that if
13317                                  * a lock is already applied, then
13318                                  * the input via the net is happening
13319                                  * and I don't need to start output :-D
13320                                  */
13321                                 NET_EPOCH_ENTER(et);
13322                                 if (hold_tcblock == 0) {
13323                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13324                                                 hold_tcblock = 1;
13325                                                 sctp_chunk_output(inp,
13326                                                     stcb,
13327                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13328                                         }
13329                                 } else {
13330                                         sctp_chunk_output(inp,
13331                                             stcb,
13332                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13333                                 }
13334                                 NET_EPOCH_EXIT(et);
13335                         }
13336                         if (hold_tcblock == 1) {
13337                                 SCTP_TCB_UNLOCK(stcb);
13338                                 hold_tcblock = 0;
13339                         }
13340                         SOCKBUF_LOCK(&so->so_snd);
13341                         /*-
13342                          * This is a bit strange, but I think it will
13343                          * work. The total_output_queue_size is locked and
13344                          * protected by the TCB_LOCK, which we just released.
13345                          * There is a race that can occur between releasing it
13346                          * above, and me getting the socket lock, where sacks
13347                          * come in but we have not put the SB_WAIT on the
13348                          * so_snd buffer to get the wakeup. After the LOCK
13349                          * is applied the sack_processing will also need to
13350                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13351                          * once we have the socket buffer lock if we recheck the
13352                          * size we KNOW we will get to sleep safely with the
13353                          * wakeup flag in place.
13354                          */
13355                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13356                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13357                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13358                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13359                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13360                                             asoc, uio->uio_resid);
13361                                 }
13362                                 be.error = 0;
13363                                 stcb->block_entry = &be;
13364                                 error = sbwait(&so->so_snd);
13365                                 stcb->block_entry = NULL;
13366
13367                                 if (error || so->so_error || be.error) {
13368                                         if (error == 0) {
13369                                                 if (so->so_error)
13370                                                         error = so->so_error;
13371                                                 if (be.error) {
13372                                                         error = be.error;
13373                                                 }
13374                                         }
13375                                         SOCKBUF_UNLOCK(&so->so_snd);
13376                                         SCTP_TCB_SEND_LOCK(stcb);
13377                                         if (sp != NULL) {
13378                                                 sp->processing = 0;
13379                                         }
13380                                         SCTP_TCB_SEND_UNLOCK(stcb);
13381                                         goto out_unlocked;
13382                                 }
13383
13384                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13385                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13386                                             asoc, stcb->asoc.total_output_queue_size);
13387                                 }
13388                         }
13389                         SOCKBUF_UNLOCK(&so->so_snd);
13390                         SCTP_TCB_SEND_LOCK(stcb);
13391                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13392                                 if (sp != NULL) {
13393                                         sp->processing = 0;
13394                                 }
13395                                 SCTP_TCB_SEND_UNLOCK(stcb);
13396                                 goto out_unlocked;
13397                         }
13398                         SCTP_TCB_SEND_UNLOCK(stcb);
13399                 }
13400                 SCTP_TCB_SEND_LOCK(stcb);
13401                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13402                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13403                         SCTP_TCB_SEND_UNLOCK(stcb);
13404                         goto out_unlocked;
13405                 }
13406                 if (sp) {
13407                         if (sp->msg_is_complete == 0) {
13408                                 strm->last_msg_incomplete = 1;
13409                                 if (stcb->asoc.idata_supported == 0) {
13410                                         asoc->stream_locked = 1;
13411                                         asoc->stream_locked_on = srcv->sinfo_stream;
13412                                 }
13413                         } else {
13414                                 sp->sender_all_done = 1;
13415                                 strm->last_msg_incomplete = 0;
13416                                 asoc->stream_locked = 0;
13417                         }
13418                         sp->processing = 0;
13419                 } else {
13420                         SCTP_PRINTF("Huh no sp TSNH?\n");
13421                         strm->last_msg_incomplete = 0;
13422                         asoc->stream_locked = 0;
13423                 }
13424                 SCTP_TCB_SEND_UNLOCK(stcb);
13425                 if (uio->uio_resid == 0) {
13426                         got_all_of_the_send = 1;
13427                 }
13428         } else {
13429                 /* We send in a 0, since we do NOT have any locks */
13430                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13431                 top = NULL;
13432                 if (sinfo_flags & SCTP_EOF) {
13433                         got_all_of_the_send = 1;
13434                 }
13435         }
13436         if (error) {
13437                 goto out;
13438         }
13439 dataless_eof:
13440         /* EOF thing ? */
13441         if ((sinfo_flags & SCTP_EOF) &&
13442             (got_all_of_the_send == 1)) {
13443                 SCTP_STAT_INCR(sctps_sends_with_eof);
13444                 error = 0;
13445                 if (hold_tcblock == 0) {
13446                         SCTP_TCB_LOCK(stcb);
13447                         hold_tcblock = 1;
13448                 }
13449                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13450                     TAILQ_EMPTY(&asoc->sent_queue) &&
13451                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13452                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13453                                 goto abort_anyway;
13454                         }
13455                         /* there is nothing queued to send, so I'm done... */
13456                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13457                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13458                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13459                                 struct sctp_nets *netp;
13460
13461                                 /* only send SHUTDOWN the first time through */
13462                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13463                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13464                                 }
13465                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13466                                 sctp_stop_timers_for_shutdown(stcb);
13467                                 if (stcb->asoc.alternate) {
13468                                         netp = stcb->asoc.alternate;
13469                                 } else {
13470                                         netp = stcb->asoc.primary_destination;
13471                                 }
13472                                 sctp_send_shutdown(stcb, netp);
13473                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13474                                     netp);
13475                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13476                                     NULL);
13477                         }
13478                 } else {
13479                         /*-
13480                          * we still got (or just got) data to send, so set
13481                          * SHUTDOWN_PENDING
13482                          */
13483                         /*-
13484                          * XXX sockets draft says that SCTP_EOF should be
13485                          * sent with no data.  currently, we will allow user
13486                          * data to be sent first and move to
13487                          * SHUTDOWN-PENDING
13488                          */
13489                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13490                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13491                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13492                                 if (hold_tcblock == 0) {
13493                                         SCTP_TCB_LOCK(stcb);
13494                                         hold_tcblock = 1;
13495                                 }
13496                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13497                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13498                                 }
13499                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13500                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13501                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13502                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13503                                         struct mbuf *op_err;
13504                                         char msg[SCTP_DIAG_INFO_LEN];
13505
13506                         abort_anyway:
13507                                         if (free_cnt_applied) {
13508                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13509                                                 free_cnt_applied = 0;
13510                                         }
13511                                         SCTP_SNPRINTF(msg, sizeof(msg),
13512                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13513                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13514                                             msg);
13515                                         NET_EPOCH_ENTER(et);
13516                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13517                                             op_err, SCTP_SO_LOCKED);
13518                                         NET_EPOCH_EXIT(et);
13519                                         /*
13520                                          * now relock the stcb so everything
13521                                          * is sane
13522                                          */
13523                                         hold_tcblock = 0;
13524                                         stcb = NULL;
13525                                         goto out;
13526                                 }
13527                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13528                                     NULL);
13529                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13530                         }
13531                 }
13532         }
13533 skip_out_eof:
13534         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13535                 some_on_control = 1;
13536         }
13537         if (queue_only_for_init) {
13538                 if (hold_tcblock == 0) {
13539                         SCTP_TCB_LOCK(stcb);
13540                         hold_tcblock = 1;
13541                 }
13542                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13543                         /* a collision took us forward? */
13544                         queue_only = 0;
13545                 } else {
13546                         NET_EPOCH_ENTER(et);
13547                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13548                         NET_EPOCH_EXIT(et);
13549                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13550                         queue_only = 1;
13551                 }
13552         }
13553         if ((net->flight_size > net->cwnd) &&
13554             (stcb->asoc.sctp_cmt_on_off == 0)) {
13555                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13556                 queue_only = 1;
13557         } else if (asoc->ifp_had_enobuf) {
13558                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13559                 if (net->flight_size > (2 * net->mtu)) {
13560                         queue_only = 1;
13561                 }
13562                 asoc->ifp_had_enobuf = 0;
13563         }
13564         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13565         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13566             (stcb->asoc.total_flight > 0) &&
13567             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13568             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13569                 /*-
13570                  * Ok, Nagle is set on and we have data outstanding.
13571                  * Don't send anything and let SACKs drive out the
13572                  * data unless wen have a "full" segment to send.
13573                  */
13574                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13575                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13576                 }
13577                 SCTP_STAT_INCR(sctps_naglequeued);
13578                 nagle_applies = 1;
13579         } else {
13580                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13581                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13582                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13583                 }
13584                 SCTP_STAT_INCR(sctps_naglesent);
13585                 nagle_applies = 0;
13586         }
13587         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13588                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13589                     nagle_applies, un_sent);
13590                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13591                     stcb->asoc.total_flight,
13592                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13593         }
13594         NET_EPOCH_ENTER(et);
13595         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13596                 /* we can attempt to send too. */
13597                 if (hold_tcblock == 0) {
13598                         /*
13599                          * If there is activity recv'ing sacks no need to
13600                          * send
13601                          */
13602                         if (SCTP_TCB_TRYLOCK(stcb)) {
13603                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13604                                 hold_tcblock = 1;
13605                         }
13606                 } else {
13607                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13608                 }
13609         } else if ((queue_only == 0) &&
13610                     (stcb->asoc.peers_rwnd == 0) &&
13611             (stcb->asoc.total_flight == 0)) {
13612                 /* We get to have a probe outstanding */
13613                 if (hold_tcblock == 0) {
13614                         hold_tcblock = 1;
13615                         SCTP_TCB_LOCK(stcb);
13616                 }
13617                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13618         } else if (some_on_control) {
13619                 int num_out, reason, frag_point;
13620
13621                 /* Here we do control only */
13622                 if (hold_tcblock == 0) {
13623                         hold_tcblock = 1;
13624                         SCTP_TCB_LOCK(stcb);
13625                 }
13626                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13627                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13628                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13629         }
13630         NET_EPOCH_EXIT(et);
13631         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13632             queue_only, stcb->asoc.peers_rwnd, un_sent,
13633             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13634             stcb->asoc.total_output_queue_size, error);
13635
13636 out:
13637 out_unlocked:
13638
13639         if (local_soresv && stcb) {
13640                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13641         }
13642         if (create_lock_applied) {
13643                 SCTP_ASOC_CREATE_UNLOCK(inp);
13644         }
13645         if ((stcb) && hold_tcblock) {
13646                 SCTP_TCB_UNLOCK(stcb);
13647         }
13648         if (stcb && free_cnt_applied) {
13649                 atomic_add_int(&stcb->asoc.refcnt, -1);
13650         }
13651 #ifdef INVARIANTS
13652         if (stcb) {
13653                 if (mtx_owned(&stcb->tcb_mtx)) {
13654                         panic("Leaving with tcb mtx owned?");
13655                 }
13656                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13657                         panic("Leaving with tcb send mtx owned?");
13658                 }
13659         }
13660 #endif
13661         if (top) {
13662                 sctp_m_freem(top);
13663         }
13664         if (control) {
13665                 sctp_m_freem(control);
13666         }
13667         return (error);
13668 }
13669
13670 /*
13671  * generate an AUTHentication chunk, if required
13672  */
13673 struct mbuf *
13674 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13675     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13676     struct sctp_tcb *stcb, uint8_t chunk)
13677 {
13678         struct mbuf *m_auth;
13679         struct sctp_auth_chunk *auth;
13680         int chunk_len;
13681         struct mbuf *cn;
13682
13683         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13684             (stcb == NULL))
13685                 return (m);
13686
13687         if (stcb->asoc.auth_supported == 0) {
13688                 return (m);
13689         }
13690         /* does the requested chunk require auth? */
13691         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13692                 return (m);
13693         }
13694         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13695         if (m_auth == NULL) {
13696                 /* no mbuf's */
13697                 return (m);
13698         }
13699         /* reserve some space if this will be the first mbuf */
13700         if (m == NULL)
13701                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13702         /* fill in the AUTH chunk details */
13703         auth = mtod(m_auth, struct sctp_auth_chunk *);
13704         memset(auth, 0, sizeof(*auth));
13705         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13706         auth->ch.chunk_flags = 0;
13707         chunk_len = sizeof(*auth) +
13708             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13709         auth->ch.chunk_length = htons(chunk_len);
13710         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13711         /* key id and hmac digest will be computed and filled in upon send */
13712
13713         /* save the offset where the auth was inserted into the chain */
13714         *offset = 0;
13715         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13716                 *offset += SCTP_BUF_LEN(cn);
13717         }
13718
13719         /* update length and return pointer to the auth chunk */
13720         SCTP_BUF_LEN(m_auth) = chunk_len;
13721         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13722         if (auth_ret != NULL)
13723                 *auth_ret = auth;
13724
13725         return (m);
13726 }
13727
13728 #ifdef INET6
13729 int
13730 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13731 {
13732         struct nd_prefix *pfx = NULL;
13733         struct nd_pfxrouter *pfxrtr = NULL;
13734         struct sockaddr_in6 gw6;
13735
13736         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13737                 return (0);
13738
13739         /* get prefix entry of address */
13740         ND6_RLOCK();
13741         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13742                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13743                         continue;
13744                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13745                     &src6->sin6_addr, &pfx->ndpr_mask))
13746                         break;
13747         }
13748         /* no prefix entry in the prefix list */
13749         if (pfx == NULL) {
13750                 ND6_RUNLOCK();
13751                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13752                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13753                 return (0);
13754         }
13755
13756         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13757         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13758
13759         /* search installed gateway from prefix entry */
13760         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13761                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13762                 gw6.sin6_family = AF_INET6;
13763                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13764                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13765                     sizeof(struct in6_addr));
13766                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13767                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13768                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13769                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13770                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13771                         ND6_RUNLOCK();
13772                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13773                         return (1);
13774                 }
13775         }
13776         ND6_RUNLOCK();
13777         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13778         return (0);
13779 }
13780 #endif
13781
13782 int
13783 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13784 {
13785 #ifdef INET
13786         struct sockaddr_in *sin, *mask;
13787         struct ifaddr *ifa;
13788         struct in_addr srcnetaddr, gwnetaddr;
13789
13790         if (ro == NULL || ro->ro_nh == NULL ||
13791             sifa->address.sa.sa_family != AF_INET) {
13792                 return (0);
13793         }
13794         ifa = (struct ifaddr *)sifa->ifa;
13795         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13796         sin = &sifa->address.sin;
13797         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13798         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13799         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13800         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13801
13802         sin = &ro->ro_nh->gw4_sa;
13803         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13804         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13805         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13806         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13807         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13808                 return (1);
13809         }
13810 #endif
13811         return (0);
13812 }