sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52
  53
  54
  55 #define SCTP_MAX_GAPS_INARRAY 4
  56 struct sack_track {
  57         uint8_t right_edge;     /* mergable on the right edge */
  58         uint8_t left_edge;      /* mergable on the left edge */
  59         uint8_t num_entries;
  60         uint8_t spare;
  61         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  62 };
  63
  64 struct sack_track sack_array[256] = {
  65         {0, 0, 0, 0,            /* 0x00 */
  66                 {{0, 0},
  67                 {0, 0},
  68                 {0, 0},
  69                 {0, 0}
  70                 }
  71         },
  72         {1, 0, 1, 0,            /* 0x01 */
  73                 {{0, 0},
  74                 {0, 0},
  75                 {0, 0},
  76                 {0, 0}
  77                 }
  78         },
  79         {0, 0, 1, 0,            /* 0x02 */
  80                 {{1, 1},
  81                 {0, 0},
  82                 {0, 0},
  83                 {0, 0}
  84                 }
  85         },
  86         {1, 0, 1, 0,            /* 0x03 */
  87                 {{0, 1},
  88                 {0, 0},
  89                 {0, 0},
  90                 {0, 0}
  91                 }
  92         },
  93         {0, 0, 1, 0,            /* 0x04 */
  94                 {{2, 2},
  95                 {0, 0},
  96                 {0, 0},
  97                 {0, 0}
  98                 }
  99         },
 100         {1, 0, 2, 0,            /* 0x05 */
 101                 {{0, 0},
 102                 {2, 2},
 103                 {0, 0},
 104                 {0, 0}
 105                 }
 106         },
 107         {0, 0, 1, 0,            /* 0x06 */
 108                 {{1, 2},
 109                 {0, 0},
 110                 {0, 0},
 111                 {0, 0}
 112                 }
 113         },
 114         {1, 0, 1, 0,            /* 0x07 */
 115                 {{0, 2},
 116                 {0, 0},
 117                 {0, 0},
 118                 {0, 0}
 119                 }
 120         },
 121         {0, 0, 1, 0,            /* 0x08 */
 122                 {{3, 3},
 123                 {0, 0},
 124                 {0, 0},
 125                 {0, 0}
 126                 }
 127         },
 128         {1, 0, 2, 0,            /* 0x09 */
 129                 {{0, 0},
 130                 {3, 3},
 131                 {0, 0},
 132                 {0, 0}
 133                 }
 134         },
 135         {0, 0, 2, 0,            /* 0x0a */
 136                 {{1, 1},
 137                 {3, 3},
 138                 {0, 0},
 139                 {0, 0}
 140                 }
 141         },
 142         {1, 0, 2, 0,            /* 0x0b */
 143                 {{0, 1},
 144                 {3, 3},
 145                 {0, 0},
 146                 {0, 0}
 147                 }
 148         },
 149         {0, 0, 1, 0,            /* 0x0c */
 150                 {{2, 3},
 151                 {0, 0},
 152                 {0, 0},
 153                 {0, 0}
 154                 }
 155         },
 156         {1, 0, 2, 0,            /* 0x0d */
 157                 {{0, 0},
 158                 {2, 3},
 159                 {0, 0},
 160                 {0, 0}
 161                 }
 162         },
 163         {0, 0, 1, 0,            /* 0x0e */
 164                 {{1, 3},
 165                 {0, 0},
 166                 {0, 0},
 167                 {0, 0}
 168                 }
 169         },
 170         {1, 0, 1, 0,            /* 0x0f */
 171                 {{0, 3},
 172                 {0, 0},
 173                 {0, 0},
 174                 {0, 0}
 175                 }
 176         },
 177         {0, 0, 1, 0,            /* 0x10 */
 178                 {{4, 4},
 179                 {0, 0},
 180                 {0, 0},
 181                 {0, 0}
 182                 }
 183         },
 184         {1, 0, 2, 0,            /* 0x11 */
 185                 {{0, 0},
 186                 {4, 4},
 187                 {0, 0},
 188                 {0, 0}
 189                 }
 190         },
 191         {0, 0, 2, 0,            /* 0x12 */
 192                 {{1, 1},
 193                 {4, 4},
 194                 {0, 0},
 195                 {0, 0}
 196                 }
 197         },
 198         {1, 0, 2, 0,            /* 0x13 */
 199                 {{0, 1},
 200                 {4, 4},
 201                 {0, 0},
 202                 {0, 0}
 203                 }
 204         },
 205         {0, 0, 2, 0,            /* 0x14 */
 206                 {{2, 2},
 207                 {4, 4},
 208                 {0, 0},
 209                 {0, 0}
 210                 }
 211         },
 212         {1, 0, 3, 0,            /* 0x15 */
 213                 {{0, 0},
 214                 {2, 2},
 215                 {4, 4},
 216                 {0, 0}
 217                 }
 218         },
 219         {0, 0, 2, 0,            /* 0x16 */
 220                 {{1, 2},
 221                 {4, 4},
 222                 {0, 0},
 223                 {0, 0}
 224                 }
 225         },
 226         {1, 0, 2, 0,            /* 0x17 */
 227                 {{0, 2},
 228                 {4, 4},
 229                 {0, 0},
 230                 {0, 0}
 231                 }
 232         },
 233         {0, 0, 1, 0,            /* 0x18 */
 234                 {{3, 4},
 235                 {0, 0},
 236                 {0, 0},
 237                 {0, 0}
 238                 }
 239         },
 240         {1, 0, 2, 0,            /* 0x19 */
 241                 {{0, 0},
 242                 {3, 4},
 243                 {0, 0},
 244                 {0, 0}
 245                 }
 246         },
 247         {0, 0, 2, 0,            /* 0x1a */
 248                 {{1, 1},
 249                 {3, 4},
 250                 {0, 0},
 251                 {0, 0}
 252                 }
 253         },
 254         {1, 0, 2, 0,            /* 0x1b */
 255                 {{0, 1},
 256                 {3, 4},
 257                 {0, 0},
 258                 {0, 0}
 259                 }
 260         },
 261         {0, 0, 1, 0,            /* 0x1c */
 262                 {{2, 4},
 263                 {0, 0},
 264                 {0, 0},
 265                 {0, 0}
 266                 }
 267         },
 268         {1, 0, 2, 0,            /* 0x1d */
 269                 {{0, 0},
 270                 {2, 4},
 271                 {0, 0},
 272                 {0, 0}
 273                 }
 274         },
 275         {0, 0, 1, 0,            /* 0x1e */
 276                 {{1, 4},
 277                 {0, 0},
 278                 {0, 0},
 279                 {0, 0}
 280                 }
 281         },
 282         {1, 0, 1, 0,            /* 0x1f */
 283                 {{0, 4},
 284                 {0, 0},
 285                 {0, 0},
 286                 {0, 0}
 287                 }
 288         },
 289         {0, 0, 1, 0,            /* 0x20 */
 290                 {{5, 5},
 291                 {0, 0},
 292                 {0, 0},
 293                 {0, 0}
 294                 }
 295         },
 296         {1, 0, 2, 0,            /* 0x21 */
 297                 {{0, 0},
 298                 {5, 5},
 299                 {0, 0},
 300                 {0, 0}
 301                 }
 302         },
 303         {0, 0, 2, 0,            /* 0x22 */
 304                 {{1, 1},
 305                 {5, 5},
 306                 {0, 0},
 307                 {0, 0}
 308                 }
 309         },
 310         {1, 0, 2, 0,            /* 0x23 */
 311                 {{0, 1},
 312                 {5, 5},
 313                 {0, 0},
 314                 {0, 0}
 315                 }
 316         },
 317         {0, 0, 2, 0,            /* 0x24 */
 318                 {{2, 2},
 319                 {5, 5},
 320                 {0, 0},
 321                 {0, 0}
 322                 }
 323         },
 324         {1, 0, 3, 0,            /* 0x25 */
 325                 {{0, 0},
 326                 {2, 2},
 327                 {5, 5},
 328                 {0, 0}
 329                 }
 330         },
 331         {0, 0, 2, 0,            /* 0x26 */
 332                 {{1, 2},
 333                 {5, 5},
 334                 {0, 0},
 335                 {0, 0}
 336                 }
 337         },
 338         {1, 0, 2, 0,            /* 0x27 */
 339                 {{0, 2},
 340                 {5, 5},
 341                 {0, 0},
 342                 {0, 0}
 343                 }
 344         },
 345         {0, 0, 2, 0,            /* 0x28 */
 346                 {{3, 3},
 347                 {5, 5},
 348                 {0, 0},
 349                 {0, 0}
 350                 }
 351         },
 352         {1, 0, 3, 0,            /* 0x29 */
 353                 {{0, 0},
 354                 {3, 3},
 355                 {5, 5},
 356                 {0, 0}
 357                 }
 358         },
 359         {0, 0, 3, 0,            /* 0x2a */
 360                 {{1, 1},
 361                 {3, 3},
 362                 {5, 5},
 363                 {0, 0}
 364                 }
 365         },
 366         {1, 0, 3, 0,            /* 0x2b */
 367                 {{0, 1},
 368                 {3, 3},
 369                 {5, 5},
 370                 {0, 0}
 371                 }
 372         },
 373         {0, 0, 2, 0,            /* 0x2c */
 374                 {{2, 3},
 375                 {5, 5},
 376                 {0, 0},
 377                 {0, 0}
 378                 }
 379         },
 380         {1, 0, 3, 0,            /* 0x2d */
 381                 {{0, 0},
 382                 {2, 3},
 383                 {5, 5},
 384                 {0, 0}
 385                 }
 386         },
 387         {0, 0, 2, 0,            /* 0x2e */
 388                 {{1, 3},
 389                 {5, 5},
 390                 {0, 0},
 391                 {0, 0}
 392                 }
 393         },
 394         {1, 0, 2, 0,            /* 0x2f */
 395                 {{0, 3},
 396                 {5, 5},
 397                 {0, 0},
 398                 {0, 0}
 399                 }
 400         },
 401         {0, 0, 1, 0,            /* 0x30 */
 402                 {{4, 5},
 403                 {0, 0},
 404                 {0, 0},
 405                 {0, 0}
 406                 }
 407         },
 408         {1, 0, 2, 0,            /* 0x31 */
 409                 {{0, 0},
 410                 {4, 5},
 411                 {0, 0},
 412                 {0, 0}
 413                 }
 414         },
 415         {0, 0, 2, 0,            /* 0x32 */
 416                 {{1, 1},
 417                 {4, 5},
 418                 {0, 0},
 419                 {0, 0}
 420                 }
 421         },
 422         {1, 0, 2, 0,            /* 0x33 */
 423                 {{0, 1},
 424                 {4, 5},
 425                 {0, 0},
 426                 {0, 0}
 427                 }
 428         },
 429         {0, 0, 2, 0,            /* 0x34 */
 430                 {{2, 2},
 431                 {4, 5},
 432                 {0, 0},
 433                 {0, 0}
 434                 }
 435         },
 436         {1, 0, 3, 0,            /* 0x35 */
 437                 {{0, 0},
 438                 {2, 2},
 439                 {4, 5},
 440                 {0, 0}
 441                 }
 442         },
 443         {0, 0, 2, 0,            /* 0x36 */
 444                 {{1, 2},
 445                 {4, 5},
 446                 {0, 0},
 447                 {0, 0}
 448                 }
 449         },
 450         {1, 0, 2, 0,            /* 0x37 */
 451                 {{0, 2},
 452                 {4, 5},
 453                 {0, 0},
 454                 {0, 0}
 455                 }
 456         },
 457         {0, 0, 1, 0,            /* 0x38 */
 458                 {{3, 5},
 459                 {0, 0},
 460                 {0, 0},
 461                 {0, 0}
 462                 }
 463         },
 464         {1, 0, 2, 0,            /* 0x39 */
 465                 {{0, 0},
 466                 {3, 5},
 467                 {0, 0},
 468                 {0, 0}
 469                 }
 470         },
 471         {0, 0, 2, 0,            /* 0x3a */
 472                 {{1, 1},
 473                 {3, 5},
 474                 {0, 0},
 475                 {0, 0}
 476                 }
 477         },
 478         {1, 0, 2, 0,            /* 0x3b */
 479                 {{0, 1},
 480                 {3, 5},
 481                 {0, 0},
 482                 {0, 0}
 483                 }
 484         },
 485         {0, 0, 1, 0,            /* 0x3c */
 486                 {{2, 5},
 487                 {0, 0},
 488                 {0, 0},
 489                 {0, 0}
 490                 }
 491         },
 492         {1, 0, 2, 0,            /* 0x3d */
 493                 {{0, 0},
 494                 {2, 5},
 495                 {0, 0},
 496                 {0, 0}
 497                 }
 498         },
 499         {0, 0, 1, 0,            /* 0x3e */
 500                 {{1, 5},
 501                 {0, 0},
 502                 {0, 0},
 503                 {0, 0}
 504                 }
 505         },
 506         {1, 0, 1, 0,            /* 0x3f */
 507                 {{0, 5},
 508                 {0, 0},
 509                 {0, 0},
 510                 {0, 0}
 511                 }
 512         },
 513         {0, 0, 1, 0,            /* 0x40 */
 514                 {{6, 6},
 515                 {0, 0},
 516                 {0, 0},
 517                 {0, 0}
 518                 }
 519         },
 520         {1, 0, 2, 0,            /* 0x41 */
 521                 {{0, 0},
 522                 {6, 6},
 523                 {0, 0},
 524                 {0, 0}
 525                 }
 526         },
 527         {0, 0, 2, 0,            /* 0x42 */
 528                 {{1, 1},
 529                 {6, 6},
 530                 {0, 0},
 531                 {0, 0}
 532                 }
 533         },
 534         {1, 0, 2, 0,            /* 0x43 */
 535                 {{0, 1},
 536                 {6, 6},
 537                 {0, 0},
 538                 {0, 0}
 539                 }
 540         },
 541         {0, 0, 2, 0,            /* 0x44 */
 542                 {{2, 2},
 543                 {6, 6},
 544                 {0, 0},
 545                 {0, 0}
 546                 }
 547         },
 548         {1, 0, 3, 0,            /* 0x45 */
 549                 {{0, 0},
 550                 {2, 2},
 551                 {6, 6},
 552                 {0, 0}
 553                 }
 554         },
 555         {0, 0, 2, 0,            /* 0x46 */
 556                 {{1, 2},
 557                 {6, 6},
 558                 {0, 0},
 559                 {0, 0}
 560                 }
 561         },
 562         {1, 0, 2, 0,            /* 0x47 */
 563                 {{0, 2},
 564                 {6, 6},
 565                 {0, 0},
 566                 {0, 0}
 567                 }
 568         },
 569         {0, 0, 2, 0,            /* 0x48 */
 570                 {{3, 3},
 571                 {6, 6},
 572                 {0, 0},
 573                 {0, 0}
 574                 }
 575         },
 576         {1, 0, 3, 0,            /* 0x49 */
 577                 {{0, 0},
 578                 {3, 3},
 579                 {6, 6},
 580                 {0, 0}
 581                 }
 582         },
 583         {0, 0, 3, 0,            /* 0x4a */
 584                 {{1, 1},
 585                 {3, 3},
 586                 {6, 6},
 587                 {0, 0}
 588                 }
 589         },
 590         {1, 0, 3, 0,            /* 0x4b */
 591                 {{0, 1},
 592                 {3, 3},
 593                 {6, 6},
 594                 {0, 0}
 595                 }
 596         },
 597         {0, 0, 2, 0,            /* 0x4c */
 598                 {{2, 3},
 599                 {6, 6},
 600                 {0, 0},
 601                 {0, 0}
 602                 }
 603         },
 604         {1, 0, 3, 0,            /* 0x4d */
 605                 {{0, 0},
 606                 {2, 3},
 607                 {6, 6},
 608                 {0, 0}
 609                 }
 610         },
 611         {0, 0, 2, 0,            /* 0x4e */
 612                 {{1, 3},
 613                 {6, 6},
 614                 {0, 0},
 615                 {0, 0}
 616                 }
 617         },
 618         {1, 0, 2, 0,            /* 0x4f */
 619                 {{0, 3},
 620                 {6, 6},
 621                 {0, 0},
 622                 {0, 0}
 623                 }
 624         },
 625         {0, 0, 2, 0,            /* 0x50 */
 626                 {{4, 4},
 627                 {6, 6},
 628                 {0, 0},
 629                 {0, 0}
 630                 }
 631         },
 632         {1, 0, 3, 0,            /* 0x51 */
 633                 {{0, 0},
 634                 {4, 4},
 635                 {6, 6},
 636                 {0, 0}
 637                 }
 638         },
 639         {0, 0, 3, 0,            /* 0x52 */
 640                 {{1, 1},
 641                 {4, 4},
 642                 {6, 6},
 643                 {0, 0}
 644                 }
 645         },
 646         {1, 0, 3, 0,            /* 0x53 */
 647                 {{0, 1},
 648                 {4, 4},
 649                 {6, 6},
 650                 {0, 0}
 651                 }
 652         },
 653         {0, 0, 3, 0,            /* 0x54 */
 654                 {{2, 2},
 655                 {4, 4},
 656                 {6, 6},
 657                 {0, 0}
 658                 }
 659         },
 660         {1, 0, 4, 0,            /* 0x55 */
 661                 {{0, 0},
 662                 {2, 2},
 663                 {4, 4},
 664                 {6, 6}
 665                 }
 666         },
 667         {0, 0, 3, 0,            /* 0x56 */
 668                 {{1, 2},
 669                 {4, 4},
 670                 {6, 6},
 671                 {0, 0}
 672                 }
 673         },
 674         {1, 0, 3, 0,            /* 0x57 */
 675                 {{0, 2},
 676                 {4, 4},
 677                 {6, 6},
 678                 {0, 0}
 679                 }
 680         },
 681         {0, 0, 2, 0,            /* 0x58 */
 682                 {{3, 4},
 683                 {6, 6},
 684                 {0, 0},
 685                 {0, 0}
 686                 }
 687         },
 688         {1, 0, 3, 0,            /* 0x59 */
 689                 {{0, 0},
 690                 {3, 4},
 691                 {6, 6},
 692                 {0, 0}
 693                 }
 694         },
 695         {0, 0, 3, 0,            /* 0x5a */
 696                 {{1, 1},
 697                 {3, 4},
 698                 {6, 6},
 699                 {0, 0}
 700                 }
 701         },
 702         {1, 0, 3, 0,            /* 0x5b */
 703                 {{0, 1},
 704                 {3, 4},
 705                 {6, 6},
 706                 {0, 0}
 707                 }
 708         },
 709         {0, 0, 2, 0,            /* 0x5c */
 710                 {{2, 4},
 711                 {6, 6},
 712                 {0, 0},
 713                 {0, 0}
 714                 }
 715         },
 716         {1, 0, 3, 0,            /* 0x5d */
 717                 {{0, 0},
 718                 {2, 4},
 719                 {6, 6},
 720                 {0, 0}
 721                 }
 722         },
 723         {0, 0, 2, 0,            /* 0x5e */
 724                 {{1, 4},
 725                 {6, 6},
 726                 {0, 0},
 727                 {0, 0}
 728                 }
 729         },
 730         {1, 0, 2, 0,            /* 0x5f */
 731                 {{0, 4},
 732                 {6, 6},
 733                 {0, 0},
 734                 {0, 0}
 735                 }
 736         },
 737         {0, 0, 1, 0,            /* 0x60 */
 738                 {{5, 6},
 739                 {0, 0},
 740                 {0, 0},
 741                 {0, 0}
 742                 }
 743         },
 744         {1, 0, 2, 0,            /* 0x61 */
 745                 {{0, 0},
 746                 {5, 6},
 747                 {0, 0},
 748                 {0, 0}
 749                 }
 750         },
 751         {0, 0, 2, 0,            /* 0x62 */
 752                 {{1, 1},
 753                 {5, 6},
 754                 {0, 0},
 755                 {0, 0}
 756                 }
 757         },
 758         {1, 0, 2, 0,            /* 0x63 */
 759                 {{0, 1},
 760                 {5, 6},
 761                 {0, 0},
 762                 {0, 0}
 763                 }
 764         },
 765         {0, 0, 2, 0,            /* 0x64 */
 766                 {{2, 2},
 767                 {5, 6},
 768                 {0, 0},
 769                 {0, 0}
 770                 }
 771         },
 772         {1, 0, 3, 0,            /* 0x65 */
 773                 {{0, 0},
 774                 {2, 2},
 775                 {5, 6},
 776                 {0, 0}
 777                 }
 778         },
 779         {0, 0, 2, 0,            /* 0x66 */
 780                 {{1, 2},
 781                 {5, 6},
 782                 {0, 0},
 783                 {0, 0}
 784                 }
 785         },
 786         {1, 0, 2, 0,            /* 0x67 */
 787                 {{0, 2},
 788                 {5, 6},
 789                 {0, 0},
 790                 {0, 0}
 791                 }
 792         },
 793         {0, 0, 2, 0,            /* 0x68 */
 794                 {{3, 3},
 795                 {5, 6},
 796                 {0, 0},
 797                 {0, 0}
 798                 }
 799         },
 800         {1, 0, 3, 0,            /* 0x69 */
 801                 {{0, 0},
 802                 {3, 3},
 803                 {5, 6},
 804                 {0, 0}
 805                 }
 806         },
 807         {0, 0, 3, 0,            /* 0x6a */
 808                 {{1, 1},
 809                 {3, 3},
 810                 {5, 6},
 811                 {0, 0}
 812                 }
 813         },
 814         {1, 0, 3, 0,            /* 0x6b */
 815                 {{0, 1},
 816                 {3, 3},
 817                 {5, 6},
 818                 {0, 0}
 819                 }
 820         },
 821         {0, 0, 2, 0,            /* 0x6c */
 822                 {{2, 3},
 823                 {5, 6},
 824                 {0, 0},
 825                 {0, 0}
 826                 }
 827         },
 828         {1, 0, 3, 0,            /* 0x6d */
 829                 {{0, 0},
 830                 {2, 3},
 831                 {5, 6},
 832                 {0, 0}
 833                 }
 834         },
 835         {0, 0, 2, 0,            /* 0x6e */
 836                 {{1, 3},
 837                 {5, 6},
 838                 {0, 0},
 839                 {0, 0}
 840                 }
 841         },
 842         {1, 0, 2, 0,            /* 0x6f */
 843                 {{0, 3},
 844                 {5, 6},
 845                 {0, 0},
 846                 {0, 0}
 847                 }
 848         },
 849         {0, 0, 1, 0,            /* 0x70 */
 850                 {{4, 6},
 851                 {0, 0},
 852                 {0, 0},
 853                 {0, 0}
 854                 }
 855         },
 856         {1, 0, 2, 0,            /* 0x71 */
 857                 {{0, 0},
 858                 {4, 6},
 859                 {0, 0},
 860                 {0, 0}
 861                 }
 862         },
 863         {0, 0, 2, 0,            /* 0x72 */
 864                 {{1, 1},
 865                 {4, 6},
 866                 {0, 0},
 867                 {0, 0}
 868                 }
 869         },
 870         {1, 0, 2, 0,            /* 0x73 */
 871                 {{0, 1},
 872                 {4, 6},
 873                 {0, 0},
 874                 {0, 0}
 875                 }
 876         },
 877         {0, 0, 2, 0,            /* 0x74 */
 878                 {{2, 2},
 879                 {4, 6},
 880                 {0, 0},
 881                 {0, 0}
 882                 }
 883         },
 884         {1, 0, 3, 0,            /* 0x75 */
 885                 {{0, 0},
 886                 {2, 2},
 887                 {4, 6},
 888                 {0, 0}
 889                 }
 890         },
 891         {0, 0, 2, 0,            /* 0x76 */
 892                 {{1, 2},
 893                 {4, 6},
 894                 {0, 0},
 895                 {0, 0}
 896                 }
 897         },
 898         {1, 0, 2, 0,            /* 0x77 */
 899                 {{0, 2},
 900                 {4, 6},
 901                 {0, 0},
 902                 {0, 0}
 903                 }
 904         },
 905         {0, 0, 1, 0,            /* 0x78 */
 906                 {{3, 6},
 907                 {0, 0},
 908                 {0, 0},
 909                 {0, 0}
 910                 }
 911         },
 912         {1, 0, 2, 0,            /* 0x79 */
 913                 {{0, 0},
 914                 {3, 6},
 915                 {0, 0},
 916                 {0, 0}
 917                 }
 918         },
 919         {0, 0, 2, 0,            /* 0x7a */
 920                 {{1, 1},
 921                 {3, 6},
 922                 {0, 0},
 923                 {0, 0}
 924                 }
 925         },
 926         {1, 0, 2, 0,            /* 0x7b */
 927                 {{0, 1},
 928                 {3, 6},
 929                 {0, 0},
 930                 {0, 0}
 931                 }
 932         },
 933         {0, 0, 1, 0,            /* 0x7c */
 934                 {{2, 6},
 935                 {0, 0},
 936                 {0, 0},
 937                 {0, 0}
 938                 }
 939         },
 940         {1, 0, 2, 0,            /* 0x7d */
 941                 {{0, 0},
 942                 {2, 6},
 943                 {0, 0},
 944                 {0, 0}
 945                 }
 946         },
 947         {0, 0, 1, 0,            /* 0x7e */
 948                 {{1, 6},
 949                 {0, 0},
 950                 {0, 0},
 951                 {0, 0}
 952                 }
 953         },
 954         {1, 0, 1, 0,            /* 0x7f */
 955                 {{0, 6},
 956                 {0, 0},
 957                 {0, 0},
 958                 {0, 0}
 959                 }
 960         },
 961         {0, 1, 1, 0,            /* 0x80 */
 962                 {{7, 7},
 963                 {0, 0},
 964                 {0, 0},
 965                 {0, 0}
 966                 }
 967         },
 968         {1, 1, 2, 0,            /* 0x81 */
 969                 {{0, 0},
 970                 {7, 7},
 971                 {0, 0},
 972                 {0, 0}
 973                 }
 974         },
 975         {0, 1, 2, 0,            /* 0x82 */
 976                 {{1, 1},
 977                 {7, 7},
 978                 {0, 0},
 979                 {0, 0}
 980                 }
 981         },
 982         {1, 1, 2, 0,            /* 0x83 */
 983                 {{0, 1},
 984                 {7, 7},
 985                 {0, 0},
 986                 {0, 0}
 987                 }
 988         },
 989         {0, 1, 2, 0,            /* 0x84 */
 990                 {{2, 2},
 991                 {7, 7},
 992                 {0, 0},
 993                 {0, 0}
 994                 }
 995         },
 996         {1, 1, 3, 0,            /* 0x85 */
 997                 {{0, 0},
 998                 {2, 2},
 999                 {7, 7},
1000                 {0, 0}
1001                 }
1002         },
1003         {0, 1, 2, 0,            /* 0x86 */
1004                 {{1, 2},
1005                 {7, 7},
1006                 {0, 0},
1007                 {0, 0}
1008                 }
1009         },
1010         {1, 1, 2, 0,            /* 0x87 */
1011                 {{0, 2},
1012                 {7, 7},
1013                 {0, 0},
1014                 {0, 0}
1015                 }
1016         },
1017         {0, 1, 2, 0,            /* 0x88 */
1018                 {{3, 3},
1019                 {7, 7},
1020                 {0, 0},
1021                 {0, 0}
1022                 }
1023         },
1024         {1, 1, 3, 0,            /* 0x89 */
1025                 {{0, 0},
1026                 {3, 3},
1027                 {7, 7},
1028                 {0, 0}
1029                 }
1030         },
1031         {0, 1, 3, 0,            /* 0x8a */
1032                 {{1, 1},
1033                 {3, 3},
1034                 {7, 7},
1035                 {0, 0}
1036                 }
1037         },
1038         {1, 1, 3, 0,            /* 0x8b */
1039                 {{0, 1},
1040                 {3, 3},
1041                 {7, 7},
1042                 {0, 0}
1043                 }
1044         },
1045         {0, 1, 2, 0,            /* 0x8c */
1046                 {{2, 3},
1047                 {7, 7},
1048                 {0, 0},
1049                 {0, 0}
1050                 }
1051         },
1052         {1, 1, 3, 0,            /* 0x8d */
1053                 {{0, 0},
1054                 {2, 3},
1055                 {7, 7},
1056                 {0, 0}
1057                 }
1058         },
1059         {0, 1, 2, 0,            /* 0x8e */
1060                 {{1, 3},
1061                 {7, 7},
1062                 {0, 0},
1063                 {0, 0}
1064                 }
1065         },
1066         {1, 1, 2, 0,            /* 0x8f */
1067                 {{0, 3},
1068                 {7, 7},
1069                 {0, 0},
1070                 {0, 0}
1071                 }
1072         },
1073         {0, 1, 2, 0,            /* 0x90 */
1074                 {{4, 4},
1075                 {7, 7},
1076                 {0, 0},
1077                 {0, 0}
1078                 }
1079         },
1080         {1, 1, 3, 0,            /* 0x91 */
1081                 {{0, 0},
1082                 {4, 4},
1083                 {7, 7},
1084                 {0, 0}
1085                 }
1086         },
1087         {0, 1, 3, 0,            /* 0x92 */
1088                 {{1, 1},
1089                 {4, 4},
1090                 {7, 7},
1091                 {0, 0}
1092                 }
1093         },
1094         {1, 1, 3, 0,            /* 0x93 */
1095                 {{0, 1},
1096                 {4, 4},
1097                 {7, 7},
1098                 {0, 0}
1099                 }
1100         },
1101         {0, 1, 3, 0,            /* 0x94 */
1102                 {{2, 2},
1103                 {4, 4},
1104                 {7, 7},
1105                 {0, 0}
1106                 }
1107         },
1108         {1, 1, 4, 0,            /* 0x95 */
1109                 {{0, 0},
1110                 {2, 2},
1111                 {4, 4},
1112                 {7, 7}
1113                 }
1114         },
1115         {0, 1, 3, 0,            /* 0x96 */
1116                 {{1, 2},
1117                 {4, 4},
1118                 {7, 7},
1119                 {0, 0}
1120                 }
1121         },
1122         {1, 1, 3, 0,            /* 0x97 */
1123                 {{0, 2},
1124                 {4, 4},
1125                 {7, 7},
1126                 {0, 0}
1127                 }
1128         },
1129         {0, 1, 2, 0,            /* 0x98 */
1130                 {{3, 4},
1131                 {7, 7},
1132                 {0, 0},
1133                 {0, 0}
1134                 }
1135         },
1136         {1, 1, 3, 0,            /* 0x99 */
1137                 {{0, 0},
1138                 {3, 4},
1139                 {7, 7},
1140                 {0, 0}
1141                 }
1142         },
1143         {0, 1, 3, 0,            /* 0x9a */
1144                 {{1, 1},
1145                 {3, 4},
1146                 {7, 7},
1147                 {0, 0}
1148                 }
1149         },
1150         {1, 1, 3, 0,            /* 0x9b */
1151                 {{0, 1},
1152                 {3, 4},
1153                 {7, 7},
1154                 {0, 0}
1155                 }
1156         },
1157         {0, 1, 2, 0,            /* 0x9c */
1158                 {{2, 4},
1159                 {7, 7},
1160                 {0, 0},
1161                 {0, 0}
1162                 }
1163         },
1164         {1, 1, 3, 0,            /* 0x9d */
1165                 {{0, 0},
1166                 {2, 4},
1167                 {7, 7},
1168                 {0, 0}
1169                 }
1170         },
1171         {0, 1, 2, 0,            /* 0x9e */
1172                 {{1, 4},
1173                 {7, 7},
1174                 {0, 0},
1175                 {0, 0}
1176                 }
1177         },
1178         {1, 1, 2, 0,            /* 0x9f */
1179                 {{0, 4},
1180                 {7, 7},
1181                 {0, 0},
1182                 {0, 0}
1183                 }
1184         },
1185         {0, 1, 2, 0,            /* 0xa0 */
1186                 {{5, 5},
1187                 {7, 7},
1188                 {0, 0},
1189                 {0, 0}
1190                 }
1191         },
1192         {1, 1, 3, 0,            /* 0xa1 */
1193                 {{0, 0},
1194                 {5, 5},
1195                 {7, 7},
1196                 {0, 0}
1197                 }
1198         },
1199         {0, 1, 3, 0,            /* 0xa2 */
1200                 {{1, 1},
1201                 {5, 5},
1202                 {7, 7},
1203                 {0, 0}
1204                 }
1205         },
1206         {1, 1, 3, 0,            /* 0xa3 */
1207                 {{0, 1},
1208                 {5, 5},
1209                 {7, 7},
1210                 {0, 0}
1211                 }
1212         },
1213         {0, 1, 3, 0,            /* 0xa4 */
1214                 {{2, 2},
1215                 {5, 5},
1216                 {7, 7},
1217                 {0, 0}
1218                 }
1219         },
1220         {1, 1, 4, 0,            /* 0xa5 */
1221                 {{0, 0},
1222                 {2, 2},
1223                 {5, 5},
1224                 {7, 7}
1225                 }
1226         },
1227         {0, 1, 3, 0,            /* 0xa6 */
1228                 {{1, 2},
1229                 {5, 5},
1230                 {7, 7},
1231                 {0, 0}
1232                 }
1233         },
1234         {1, 1, 3, 0,            /* 0xa7 */
1235                 {{0, 2},
1236                 {5, 5},
1237                 {7, 7},
1238                 {0, 0}
1239                 }
1240         },
1241         {0, 1, 3, 0,            /* 0xa8 */
1242                 {{3, 3},
1243                 {5, 5},
1244                 {7, 7},
1245                 {0, 0}
1246                 }
1247         },
1248         {1, 1, 4, 0,            /* 0xa9 */
1249                 {{0, 0},
1250                 {3, 3},
1251                 {5, 5},
1252                 {7, 7}
1253                 }
1254         },
1255         {0, 1, 4, 0,            /* 0xaa */
1256                 {{1, 1},
1257                 {3, 3},
1258                 {5, 5},
1259                 {7, 7}
1260                 }
1261         },
1262         {1, 1, 4, 0,            /* 0xab */
1263                 {{0, 1},
1264                 {3, 3},
1265                 {5, 5},
1266                 {7, 7}
1267                 }
1268         },
1269         {0, 1, 3, 0,            /* 0xac */
1270                 {{2, 3},
1271                 {5, 5},
1272                 {7, 7},
1273                 {0, 0}
1274                 }
1275         },
1276         {1, 1, 4, 0,            /* 0xad */
1277                 {{0, 0},
1278                 {2, 3},
1279                 {5, 5},
1280                 {7, 7}
1281                 }
1282         },
1283         {0, 1, 3, 0,            /* 0xae */
1284                 {{1, 3},
1285                 {5, 5},
1286                 {7, 7},
1287                 {0, 0}
1288                 }
1289         },
1290         {1, 1, 3, 0,            /* 0xaf */
1291                 {{0, 3},
1292                 {5, 5},
1293                 {7, 7},
1294                 {0, 0}
1295                 }
1296         },
1297         {0, 1, 2, 0,            /* 0xb0 */
1298                 {{4, 5},
1299                 {7, 7},
1300                 {0, 0},
1301                 {0, 0}
1302                 }
1303         },
1304         {1, 1, 3, 0,            /* 0xb1 */
1305                 {{0, 0},
1306                 {4, 5},
1307                 {7, 7},
1308                 {0, 0}
1309                 }
1310         },
1311         {0, 1, 3, 0,            /* 0xb2 */
1312                 {{1, 1},
1313                 {4, 5},
1314                 {7, 7},
1315                 {0, 0}
1316                 }
1317         },
1318         {1, 1, 3, 0,            /* 0xb3 */
1319                 {{0, 1},
1320                 {4, 5},
1321                 {7, 7},
1322                 {0, 0}
1323                 }
1324         },
1325         {0, 1, 3, 0,            /* 0xb4 */
1326                 {{2, 2},
1327                 {4, 5},
1328                 {7, 7},
1329                 {0, 0}
1330                 }
1331         },
1332         {1, 1, 4, 0,            /* 0xb5 */
1333                 {{0, 0},
1334                 {2, 2},
1335                 {4, 5},
1336                 {7, 7}
1337                 }
1338         },
1339         {0, 1, 3, 0,            /* 0xb6 */
1340                 {{1, 2},
1341                 {4, 5},
1342                 {7, 7},
1343                 {0, 0}
1344                 }
1345         },
1346         {1, 1, 3, 0,            /* 0xb7 */
1347                 {{0, 2},
1348                 {4, 5},
1349                 {7, 7},
1350                 {0, 0}
1351                 }
1352         },
1353         {0, 1, 2, 0,            /* 0xb8 */
1354                 {{3, 5},
1355                 {7, 7},
1356                 {0, 0},
1357                 {0, 0}
1358                 }
1359         },
1360         {1, 1, 3, 0,            /* 0xb9 */
1361                 {{0, 0},
1362                 {3, 5},
1363                 {7, 7},
1364                 {0, 0}
1365                 }
1366         },
1367         {0, 1, 3, 0,            /* 0xba */
1368                 {{1, 1},
1369                 {3, 5},
1370                 {7, 7},
1371                 {0, 0}
1372                 }
1373         },
1374         {1, 1, 3, 0,            /* 0xbb */
1375                 {{0, 1},
1376                 {3, 5},
1377                 {7, 7},
1378                 {0, 0}
1379                 }
1380         },
1381         {0, 1, 2, 0,            /* 0xbc */
1382                 {{2, 5},
1383                 {7, 7},
1384                 {0, 0},
1385                 {0, 0}
1386                 }
1387         },
1388         {1, 1, 3, 0,            /* 0xbd */
1389                 {{0, 0},
1390                 {2, 5},
1391                 {7, 7},
1392                 {0, 0}
1393                 }
1394         },
1395         {0, 1, 2, 0,            /* 0xbe */
1396                 {{1, 5},
1397                 {7, 7},
1398                 {0, 0},
1399                 {0, 0}
1400                 }
1401         },
1402         {1, 1, 2, 0,            /* 0xbf */
1403                 {{0, 5},
1404                 {7, 7},
1405                 {0, 0},
1406                 {0, 0}
1407                 }
1408         },
1409         {0, 1, 1, 0,            /* 0xc0 */
1410                 {{6, 7},
1411                 {0, 0},
1412                 {0, 0},
1413                 {0, 0}
1414                 }
1415         },
1416         {1, 1, 2, 0,            /* 0xc1 */
1417                 {{0, 0},
1418                 {6, 7},
1419                 {0, 0},
1420                 {0, 0}
1421                 }
1422         },
1423         {0, 1, 2, 0,            /* 0xc2 */
1424                 {{1, 1},
1425                 {6, 7},
1426                 {0, 0},
1427                 {0, 0}
1428                 }
1429         },
1430         {1, 1, 2, 0,            /* 0xc3 */
1431                 {{0, 1},
1432                 {6, 7},
1433                 {0, 0},
1434                 {0, 0}
1435                 }
1436         },
1437         {0, 1, 2, 0,            /* 0xc4 */
1438                 {{2, 2},
1439                 {6, 7},
1440                 {0, 0},
1441                 {0, 0}
1442                 }
1443         },
1444         {1, 1, 3, 0,            /* 0xc5 */
1445                 {{0, 0},
1446                 {2, 2},
1447                 {6, 7},
1448                 {0, 0}
1449                 }
1450         },
1451         {0, 1, 2, 0,            /* 0xc6 */
1452                 {{1, 2},
1453                 {6, 7},
1454                 {0, 0},
1455                 {0, 0}
1456                 }
1457         },
1458         {1, 1, 2, 0,            /* 0xc7 */
1459                 {{0, 2},
1460                 {6, 7},
1461                 {0, 0},
1462                 {0, 0}
1463                 }
1464         },
1465         {0, 1, 2, 0,            /* 0xc8 */
1466                 {{3, 3},
1467                 {6, 7},
1468                 {0, 0},
1469                 {0, 0}
1470                 }
1471         },
1472         {1, 1, 3, 0,            /* 0xc9 */
1473                 {{0, 0},
1474                 {3, 3},
1475                 {6, 7},
1476                 {0, 0}
1477                 }
1478         },
1479         {0, 1, 3, 0,            /* 0xca */
1480                 {{1, 1},
1481                 {3, 3},
1482                 {6, 7},
1483                 {0, 0}
1484                 }
1485         },
1486         {1, 1, 3, 0,            /* 0xcb */
1487                 {{0, 1},
1488                 {3, 3},
1489                 {6, 7},
1490                 {0, 0}
1491                 }
1492         },
1493         {0, 1, 2, 0,            /* 0xcc */
1494                 {{2, 3},
1495                 {6, 7},
1496                 {0, 0},
1497                 {0, 0}
1498                 }
1499         },
1500         {1, 1, 3, 0,            /* 0xcd */
1501                 {{0, 0},
1502                 {2, 3},
1503                 {6, 7},
1504                 {0, 0}
1505                 }
1506         },
1507         {0, 1, 2, 0,            /* 0xce */
1508                 {{1, 3},
1509                 {6, 7},
1510                 {0, 0},
1511                 {0, 0}
1512                 }
1513         },
1514         {1, 1, 2, 0,            /* 0xcf */
1515                 {{0, 3},
1516                 {6, 7},
1517                 {0, 0},
1518                 {0, 0}
1519                 }
1520         },
1521         {0, 1, 2, 0,            /* 0xd0 */
1522                 {{4, 4},
1523                 {6, 7},
1524                 {0, 0},
1525                 {0, 0}
1526                 }
1527         },
1528         {1, 1, 3, 0,            /* 0xd1 */
1529                 {{0, 0},
1530                 {4, 4},
1531                 {6, 7},
1532                 {0, 0}
1533                 }
1534         },
1535         {0, 1, 3, 0,            /* 0xd2 */
1536                 {{1, 1},
1537                 {4, 4},
1538                 {6, 7},
1539                 {0, 0}
1540                 }
1541         },
1542         {1, 1, 3, 0,            /* 0xd3 */
1543                 {{0, 1},
1544                 {4, 4},
1545                 {6, 7},
1546                 {0, 0}
1547                 }
1548         },
1549         {0, 1, 3, 0,            /* 0xd4 */
1550                 {{2, 2},
1551                 {4, 4},
1552                 {6, 7},
1553                 {0, 0}
1554                 }
1555         },
1556         {1, 1, 4, 0,            /* 0xd5 */
1557                 {{0, 0},
1558                 {2, 2},
1559                 {4, 4},
1560                 {6, 7}
1561                 }
1562         },
1563         {0, 1, 3, 0,            /* 0xd6 */
1564                 {{1, 2},
1565                 {4, 4},
1566                 {6, 7},
1567                 {0, 0}
1568                 }
1569         },
1570         {1, 1, 3, 0,            /* 0xd7 */
1571                 {{0, 2},
1572                 {4, 4},
1573                 {6, 7},
1574                 {0, 0}
1575                 }
1576         },
1577         {0, 1, 2, 0,            /* 0xd8 */
1578                 {{3, 4},
1579                 {6, 7},
1580                 {0, 0},
1581                 {0, 0}
1582                 }
1583         },
1584         {1, 1, 3, 0,            /* 0xd9 */
1585                 {{0, 0},
1586                 {3, 4},
1587                 {6, 7},
1588                 {0, 0}
1589                 }
1590         },
1591         {0, 1, 3, 0,            /* 0xda */
1592                 {{1, 1},
1593                 {3, 4},
1594                 {6, 7},
1595                 {0, 0}
1596                 }
1597         },
1598         {1, 1, 3, 0,            /* 0xdb */
1599                 {{0, 1},
1600                 {3, 4},
1601                 {6, 7},
1602                 {0, 0}
1603                 }
1604         },
1605         {0, 1, 2, 0,            /* 0xdc */
1606                 {{2, 4},
1607                 {6, 7},
1608                 {0, 0},
1609                 {0, 0}
1610                 }
1611         },
1612         {1, 1, 3, 0,            /* 0xdd */
1613                 {{0, 0},
1614                 {2, 4},
1615                 {6, 7},
1616                 {0, 0}
1617                 }
1618         },
1619         {0, 1, 2, 0,            /* 0xde */
1620                 {{1, 4},
1621                 {6, 7},
1622                 {0, 0},
1623                 {0, 0}
1624                 }
1625         },
1626         {1, 1, 2, 0,            /* 0xdf */
1627                 {{0, 4},
1628                 {6, 7},
1629                 {0, 0},
1630                 {0, 0}
1631                 }
1632         },
1633         {0, 1, 1, 0,            /* 0xe0 */
1634                 {{5, 7},
1635                 {0, 0},
1636                 {0, 0},
1637                 {0, 0}
1638                 }
1639         },
1640         {1, 1, 2, 0,            /* 0xe1 */
1641                 {{0, 0},
1642                 {5, 7},
1643                 {0, 0},
1644                 {0, 0}
1645                 }
1646         },
1647         {0, 1, 2, 0,            /* 0xe2 */
1648                 {{1, 1},
1649                 {5, 7},
1650                 {0, 0},
1651                 {0, 0}
1652                 }
1653         },
1654         {1, 1, 2, 0,            /* 0xe3 */
1655                 {{0, 1},
1656                 {5, 7},
1657                 {0, 0},
1658                 {0, 0}
1659                 }
1660         },
1661         {0, 1, 2, 0,            /* 0xe4 */
1662                 {{2, 2},
1663                 {5, 7},
1664                 {0, 0},
1665                 {0, 0}
1666                 }
1667         },
1668         {1, 1, 3, 0,            /* 0xe5 */
1669                 {{0, 0},
1670                 {2, 2},
1671                 {5, 7},
1672                 {0, 0}
1673                 }
1674         },
1675         {0, 1, 2, 0,            /* 0xe6 */
1676                 {{1, 2},
1677                 {5, 7},
1678                 {0, 0},
1679                 {0, 0}
1680                 }
1681         },
1682         {1, 1, 2, 0,            /* 0xe7 */
1683                 {{0, 2},
1684                 {5, 7},
1685                 {0, 0},
1686                 {0, 0}
1687                 }
1688         },
1689         {0, 1, 2, 0,            /* 0xe8 */
1690                 {{3, 3},
1691                 {5, 7},
1692                 {0, 0},
1693                 {0, 0}
1694                 }
1695         },
1696         {1, 1, 3, 0,            /* 0xe9 */
1697                 {{0, 0},
1698                 {3, 3},
1699                 {5, 7},
1700                 {0, 0}
1701                 }
1702         },
1703         {0, 1, 3, 0,            /* 0xea */
1704                 {{1, 1},
1705                 {3, 3},
1706                 {5, 7},
1707                 {0, 0}
1708                 }
1709         },
1710         {1, 1, 3, 0,            /* 0xeb */
1711                 {{0, 1},
1712                 {3, 3},
1713                 {5, 7},
1714                 {0, 0}
1715                 }
1716         },
1717         {0, 1, 2, 0,            /* 0xec */
1718                 {{2, 3},
1719                 {5, 7},
1720                 {0, 0},
1721                 {0, 0}
1722                 }
1723         },
1724         {1, 1, 3, 0,            /* 0xed */
1725                 {{0, 0},
1726                 {2, 3},
1727                 {5, 7},
1728                 {0, 0}
1729                 }
1730         },
1731         {0, 1, 2, 0,            /* 0xee */
1732                 {{1, 3},
1733                 {5, 7},
1734                 {0, 0},
1735                 {0, 0}
1736                 }
1737         },
1738         {1, 1, 2, 0,            /* 0xef */
1739                 {{0, 3},
1740                 {5, 7},
1741                 {0, 0},
1742                 {0, 0}
1743                 }
1744         },
1745         {0, 1, 1, 0,            /* 0xf0 */
1746                 {{4, 7},
1747                 {0, 0},
1748                 {0, 0},
1749                 {0, 0}
1750                 }
1751         },
1752         {1, 1, 2, 0,            /* 0xf1 */
1753                 {{0, 0},
1754                 {4, 7},
1755                 {0, 0},
1756                 {0, 0}
1757                 }
1758         },
1759         {0, 1, 2, 0,            /* 0xf2 */
1760                 {{1, 1},
1761                 {4, 7},
1762                 {0, 0},
1763                 {0, 0}
1764                 }
1765         },
1766         {1, 1, 2, 0,            /* 0xf3 */
1767                 {{0, 1},
1768                 {4, 7},
1769                 {0, 0},
1770                 {0, 0}
1771                 }
1772         },
1773         {0, 1, 2, 0,            /* 0xf4 */
1774                 {{2, 2},
1775                 {4, 7},
1776                 {0, 0},
1777                 {0, 0}
1778                 }
1779         },
1780         {1, 1, 3, 0,            /* 0xf5 */
1781                 {{0, 0},
1782                 {2, 2},
1783                 {4, 7},
1784                 {0, 0}
1785                 }
1786         },
1787         {0, 1, 2, 0,            /* 0xf6 */
1788                 {{1, 2},
1789                 {4, 7},
1790                 {0, 0},
1791                 {0, 0}
1792                 }
1793         },
1794         {1, 1, 2, 0,            /* 0xf7 */
1795                 {{0, 2},
1796                 {4, 7},
1797                 {0, 0},
1798                 {0, 0}
1799                 }
1800         },
1801         {0, 1, 1, 0,            /* 0xf8 */
1802                 {{3, 7},
1803                 {0, 0},
1804                 {0, 0},
1805                 {0, 0}
1806                 }
1807         },
1808         {1, 1, 2, 0,            /* 0xf9 */
1809                 {{0, 0},
1810                 {3, 7},
1811                 {0, 0},
1812                 {0, 0}
1813                 }
1814         },
1815         {0, 1, 2, 0,            /* 0xfa */
1816                 {{1, 1},
1817                 {3, 7},
1818                 {0, 0},
1819                 {0, 0}
1820                 }
1821         },
1822         {1, 1, 2, 0,            /* 0xfb */
1823                 {{0, 1},
1824                 {3, 7},
1825                 {0, 0},
1826                 {0, 0}
1827                 }
1828         },
1829         {0, 1, 1, 0,            /* 0xfc */
1830                 {{2, 7},
1831                 {0, 0},
1832                 {0, 0},
1833                 {0, 0}
1834                 }
1835         },
1836         {1, 1, 2, 0,            /* 0xfd */
1837                 {{0, 0},
1838                 {2, 7},
1839                 {0, 0},
1840                 {0, 0}
1841                 }
1842         },
1843         {0, 1, 1, 0,            /* 0xfe */
1844                 {{1, 7},
1845                 {0, 0},
1846                 {0, 0},
1847                 {0, 0}
1848                 }
1849         },
1850         {1, 1, 1, 0,            /* 0xff */
1851                 {{0, 7},
1852                 {0, 0},
1853                 {0, 0},
1854                 {0, 0}
1855                 }
1856         }
1857 };
1858
1859
1860 int
1861 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1862     int ipv4_addr_legal,
1863     int ipv6_addr_legal,
1864     int loopback_scope,
1865     int ipv4_local_scope,
1866     int local_scope,
1867     int site_scope,
1868     int do_update)
1869 {
1870         if ((loopback_scope == 0) &&
1871             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1872                 /*
1873                  * skip loopback if not in scope *
1874                  */
1875                 return (0);
1876         }
1877         if ((ifa->address.sa.sa_family == AF_INET) && ipv4_addr_legal) {
1878                 struct sockaddr_in *sin;
1879
1880                 sin = (struct sockaddr_in *)&ifa->address.sin;
1881                 if (sin->sin_addr.s_addr == 0) {
1882                         /* not in scope , unspecified */
1883                         return (0);
1884                 }
1885                 if ((ipv4_local_scope == 0) &&
1886                     (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1887                         /* private address not in scope */
1888                         return (0);
1889                 }
1890         } else if ((ifa->address.sa.sa_family == AF_INET6) && ipv6_addr_legal) {
1891                 struct sockaddr_in6 *sin6;
1892
1893                 /*
1894                  * Must update the flags,  bummer, which means any IFA locks
1895                  * must now be applied HERE <->
1896                  */
1897                 if (do_update) {
1898                         sctp_gather_internal_ifa_flags(ifa);
1899                 }
1900                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1901                         return (0);
1902                 }
1903                 /* ok to use deprecated addresses? */
1904                 sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1905                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1906                         /* skip unspecifed addresses */
1907                         return (0);
1908                 }
1909                 if (            /* (local_scope == 0) && */
1910                     (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1911                         return (0);
1912                 }
1913                 if ((site_scope == 0) &&
1914                     (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1915                         return (0);
1916                 }
1917         } else {
1918                 return (0);
1919         }
1920         return (1);
1921 }
1922
1923 static struct mbuf *
1924 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1925 {
1926         struct sctp_paramhdr *parmh;
1927         struct mbuf *mret;
1928         int len;
1929
1930         if (ifa->address.sa.sa_family == AF_INET) {
1931                 len = sizeof(struct sctp_ipv4addr_param);
1932         } else if (ifa->address.sa.sa_family == AF_INET6) {
1933                 len = sizeof(struct sctp_ipv6addr_param);
1934         } else {
1935                 /* unknown type */
1936                 return (m);
1937         }
1938         if (M_TRAILINGSPACE(m) >= len) {
1939                 /* easy side we just drop it on the end */
1940                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1941                 mret = m;
1942         } else {
1943                 /* Need more space */
1944                 mret = m;
1945                 while (SCTP_BUF_NEXT(mret) != NULL) {
1946                         mret = SCTP_BUF_NEXT(mret);
1947                 }
1948                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1949                 if (SCTP_BUF_NEXT(mret) == NULL) {
1950                         /* We are hosed, can't add more addresses */
1951                         return (m);
1952                 }
1953                 mret = SCTP_BUF_NEXT(mret);
1954                 parmh = mtod(mret, struct sctp_paramhdr *);
1955         }
1956         /* now add the parameter */
1957         if (ifa->address.sa.sa_family == AF_INET) {
1958                 struct sctp_ipv4addr_param *ipv4p;
1959                 struct sockaddr_in *sin;
1960
1961                 sin = (struct sockaddr_in *)&ifa->address.sin;
1962                 ipv4p = (struct sctp_ipv4addr_param *)parmh;
1963                 parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1964                 parmh->param_length = htons(len);
1965                 ipv4p->addr = sin->sin_addr.s_addr;
1966                 SCTP_BUF_LEN(mret) += len;
1967         } else if (ifa->address.sa.sa_family == AF_INET6) {
1968                 struct sctp_ipv6addr_param *ipv6p;
1969                 struct sockaddr_in6 *sin6;
1970
1971                 sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1972                 ipv6p = (struct sctp_ipv6addr_param *)parmh;
1973                 parmh->param_type = htons(SCTP_IPV6_ADDRESS);
1974                 parmh->param_length = htons(len);
1975                 memcpy(ipv6p->addr, &sin6->sin6_addr,
1976                     sizeof(ipv6p->addr));
1977                 /* clear embedded scope in the address */
1978                 in6_clearscope((struct in6_addr *)ipv6p->addr);
1979                 SCTP_BUF_LEN(mret) += len;
1980         } else {
1981                 return (m);
1982         }
1983         return (mret);
1984 }
1985
1986
1987 struct mbuf *
1988 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
1989     struct mbuf *m_at, int cnt_inits_to)
1990 {
1991         struct sctp_vrf *vrf = NULL;
1992         int cnt, limit_out = 0, total_count;
1993         uint32_t vrf_id;
1994
1995         vrf_id = inp->def_vrf_id;
1996         SCTP_IPI_ADDR_RLOCK();
1997         vrf = sctp_find_vrf(vrf_id);
1998         if (vrf == NULL) {
1999                 SCTP_IPI_ADDR_RUNLOCK();
2000                 return (m_at);
2001         }
2002         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2003                 struct sctp_ifa *sctp_ifap;
2004                 struct sctp_ifn *sctp_ifnp;
2005
2006                 cnt = cnt_inits_to;
2007                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2008                         limit_out = 1;
2009                         cnt = SCTP_ADDRESS_LIMIT;
2010                         goto skip_count;
2011                 }
2012                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2013                         if ((scope->loopback_scope == 0) &&
2014                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2015                                 /*
2016                                  * Skip loopback devices if loopback_scope
2017                                  * not set
2018                                  */
2019                                 continue;
2020                         }
2021                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2022                                 if (sctp_is_address_in_scope(sctp_ifap,
2023                                     scope->ipv4_addr_legal,
2024                                     scope->ipv6_addr_legal,
2025                                     scope->loopback_scope,
2026                                     scope->ipv4_local_scope,
2027                                     scope->local_scope,
2028                                     scope->site_scope, 1) == 0) {
2029                                         continue;
2030                                 }
2031                                 cnt++;
2032                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2033                                         break;
2034                                 }
2035                         }
2036                         if (cnt > SCTP_ADDRESS_LIMIT) {
2037                                 break;
2038                         }
2039                 }
2040 skip_count:
2041                 if (cnt > 1) {
2042                         total_count = 0;
2043                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2044                                 cnt = 0;
2045                                 if ((scope->loopback_scope == 0) &&
2046                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2047                                         /*
2048                                          * Skip loopback devices if
2049                                          * loopback_scope not set
2050                                          */
2051                                         continue;
2052                                 }
2053                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2054                                         if (sctp_is_address_in_scope(sctp_ifap,
2055                                             scope->ipv4_addr_legal,
2056                                             scope->ipv6_addr_legal,
2057                                             scope->loopback_scope,
2058                                             scope->ipv4_local_scope,
2059                                             scope->local_scope,
2060                                             scope->site_scope, 0) == 0) {
2061                                                 continue;
2062                                         }
2063                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2064                                         if (limit_out) {
2065                                                 cnt++;
2066                                                 total_count++;
2067                                                 if (cnt >= 2) {
2068                                                         /*
2069                                                          * two from each
2070                                                          * address
2071                                                          */
2072                                                         break;
2073                                                 }
2074                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2075                                                         /* No more addresses */
2076                                                         break;
2077                                                 }
2078                                         }
2079                                 }
2080                         }
2081                 }
2082         } else {
2083                 struct sctp_laddr *laddr;
2084
2085                 cnt = cnt_inits_to;
2086                 /* First, how many ? */
2087                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2088                         if (laddr->ifa == NULL) {
2089                                 continue;
2090                         }
2091                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2092                                 /*
2093                                  * Address being deleted by the system, dont
2094                                  * list.
2095                                  */
2096                                 continue;
2097                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2098                                 /*
2099                                  * Address being deleted on this ep don't
2100                                  * list.
2101                                  */
2102                                 continue;
2103                         }
2104                         if (sctp_is_address_in_scope(laddr->ifa,
2105                             scope->ipv4_addr_legal,
2106                             scope->ipv6_addr_legal,
2107                             scope->loopback_scope,
2108                             scope->ipv4_local_scope,
2109                             scope->local_scope,
2110                             scope->site_scope, 1) == 0) {
2111                                 continue;
2112                         }
2113                         cnt++;
2114                 }
2115                 if (cnt > SCTP_ADDRESS_LIMIT) {
2116                         limit_out = 1;
2117                 }
2118                 /*
2119                  * To get through a NAT we only list addresses if we have
2120                  * more than one. That way if you just bind a single address
2121                  * we let the source of the init dictate our address.
2122                  */
2123                 if (cnt > 1) {
2124                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2125                                 cnt = 0;
2126                                 if (laddr->ifa == NULL) {
2127                                         continue;
2128                                 }
2129                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2130                                         continue;
2131
2132                                 if (sctp_is_address_in_scope(laddr->ifa,
2133                                     scope->ipv4_addr_legal,
2134                                     scope->ipv6_addr_legal,
2135                                     scope->loopback_scope,
2136                                     scope->ipv4_local_scope,
2137                                     scope->local_scope,
2138                                     scope->site_scope, 0) == 0) {
2139                                         continue;
2140                                 }
2141                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2142                                 cnt++;
2143                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2144                                         break;
2145                                 }
2146                         }
2147                 }
2148         }
2149         SCTP_IPI_ADDR_RUNLOCK();
2150         return (m_at);
2151 }
2152
2153 static struct sctp_ifa *
2154 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2155     uint8_t dest_is_loop,
2156     uint8_t dest_is_priv,
2157     sa_family_t fam)
2158 {
2159         uint8_t dest_is_global = 0;
2160
2161         /* dest_is_priv is true if destination is a private address */
2162         /* dest_is_loop is true if destination is a loopback addresses */
2163
2164         /*
2165          * Here we determine if its a preferred address. A preferred address
2166          * means it is the same scope or higher scope then the destination.
2167          * L = loopback, P = private, G = global
2168          * ----------------------------------------- src    |  dest | result
2169          * ---------------------------------------- L     |    L  |    yes
2170          * ----------------------------------------- P     |    L  |
2171          * yes-v4 no-v6 ----------------------------------------- G     |
2172          * L  |    yes-v4 no-v6 ----------------------------------------- L
2173          * |    P  |    no ----------------------------------------- P     |
2174          * P  |    yes ----------------------------------------- G     |
2175          * P  |    no ----------------------------------------- L     |    G
2176          * |    no ----------------------------------------- P     |    G  |
2177          * no ----------------------------------------- G     |    G  |
2178          * yes -----------------------------------------
2179          */
2180
2181         if (ifa->address.sa.sa_family != fam) {
2182                 /* forget mis-matched family */
2183                 return (NULL);
2184         }
2185         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2186                 dest_is_global = 1;
2187         }
2188         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2189         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2190         /* Ok the address may be ok */
2191         if (fam == AF_INET6) {
2192                 /* ok to use deprecated addresses? */
2193                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2194                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2195                         return (NULL);
2196                 }
2197                 if (ifa->src_is_priv) {
2198                         if (dest_is_loop) {
2199                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2200                                 return (NULL);
2201                         }
2202                 }
2203                 if (ifa->src_is_glob) {
2204                         if (dest_is_loop) {
2205                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2206                                 return (NULL);
2207                         }
2208                 }
2209         }
2210         /*
2211          * Now that we know what is what, implement or table this could in
2212          * theory be done slicker (it used to be), but this is
2213          * straightforward and easier to validate :-)
2214          */
2215         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2216             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2217         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2218             dest_is_loop, dest_is_priv, dest_is_global);
2219
2220         if ((ifa->src_is_loop) && (dest_is_priv)) {
2221                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2222                 return (NULL);
2223         }
2224         if ((ifa->src_is_glob) && (dest_is_priv)) {
2225                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2226                 return (NULL);
2227         }
2228         if ((ifa->src_is_loop) && (dest_is_global)) {
2229                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2230                 return (NULL);
2231         }
2232         if ((ifa->src_is_priv) && (dest_is_global)) {
2233                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2234                 return (NULL);
2235         }
2236         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2237         /* its a preferred address */
2238         return (ifa);
2239 }
2240
2241 static struct sctp_ifa *
2242 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2243     uint8_t dest_is_loop,
2244     uint8_t dest_is_priv,
2245     sa_family_t fam)
2246 {
2247         uint8_t dest_is_global = 0;
2248
2249
2250         /*
2251          * Here we determine if its a acceptable address. A acceptable
2252          * address means it is the same scope or higher scope but we can
2253          * allow for NAT which means its ok to have a global dest and a
2254          * private src.
2255          *
2256          * L = loopback, P = private, G = global
2257          * ----------------------------------------- src    |  dest | result
2258          * ----------------------------------------- L     |   L   |    yes
2259          * ----------------------------------------- P     |   L   |
2260          * yes-v4 no-v6 ----------------------------------------- G     |
2261          * L   |    yes ----------------------------------------- L     |
2262          * P   |    no ----------------------------------------- P     |   P
2263          * |    yes ----------------------------------------- G     |   P
2264          * |    yes - May not work -----------------------------------------
2265          * L     |   G   |    no ----------------------------------------- P
2266          * |   G   |    yes - May not work
2267          * ----------------------------------------- G     |   G   |    yes
2268          * -----------------------------------------
2269          */
2270
2271         if (ifa->address.sa.sa_family != fam) {
2272                 /* forget non matching family */
2273                 return (NULL);
2274         }
2275         /* Ok the address may be ok */
2276         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2277                 dest_is_global = 1;
2278         }
2279         if (fam == AF_INET6) {
2280                 /* ok to use deprecated addresses? */
2281                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2282                         return (NULL);
2283                 }
2284                 if (ifa->src_is_priv) {
2285                         /* Special case, linklocal to loop */
2286                         if (dest_is_loop)
2287                                 return (NULL);
2288                 }
2289         }
2290         /*
2291          * Now that we know what is what, implement our table. This could in
2292          * theory be done slicker (it used to be), but this is
2293          * straightforward and easier to validate :-)
2294          */
2295         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2296                 return (NULL);
2297         }
2298         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2299                 return (NULL);
2300         }
2301         /* its an acceptable address */
2302         return (ifa);
2303 }
2304
2305 int
2306 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2307 {
2308         struct sctp_laddr *laddr;
2309
2310         if (stcb == NULL) {
2311                 /* There are no restrictions, no TCB :-) */
2312                 return (0);
2313         }
2314         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2315                 if (laddr->ifa == NULL) {
2316                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2317                             __FUNCTION__);
2318                         continue;
2319                 }
2320                 if (laddr->ifa == ifa) {
2321                         /* Yes it is on the list */
2322                         return (1);
2323                 }
2324         }
2325         return (0);
2326 }
2327
2328
2329 int
2330 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2331 {
2332         struct sctp_laddr *laddr;
2333
2334         if (ifa == NULL)
2335                 return (0);
2336         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2337                 if (laddr->ifa == NULL) {
2338                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2339                             __FUNCTION__);
2340                         continue;
2341                 }
2342                 if ((laddr->ifa == ifa) && laddr->action == 0)
2343                         /* same pointer */
2344                         return (1);
2345         }
2346         return (0);
2347 }
2348
2349
2350
2351 static struct sctp_ifa *
2352 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2353     sctp_route_t * ro,
2354     uint32_t vrf_id,
2355     int non_asoc_addr_ok,
2356     uint8_t dest_is_priv,
2357     uint8_t dest_is_loop,
2358     sa_family_t fam)
2359 {
2360         struct sctp_laddr *laddr, *starting_point;
2361         void *ifn;
2362         int resettotop = 0;
2363         struct sctp_ifn *sctp_ifn;
2364         struct sctp_ifa *sctp_ifa, *sifa;
2365         struct sctp_vrf *vrf;
2366         uint32_t ifn_index;
2367
2368         vrf = sctp_find_vrf(vrf_id);
2369         if (vrf == NULL)
2370                 return (NULL);
2371
2372         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2373         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2374         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2375         /*
2376          * first question, is the ifn we will emit on in our list, if so, we
2377          * want such an address. Note that we first looked for a preferred
2378          * address.
2379          */
2380         if (sctp_ifn) {
2381                 /* is a preferred one on the interface we route out? */
2382                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2383                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2384                             (non_asoc_addr_ok == 0))
2385                                 continue;
2386                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2387                             dest_is_loop,
2388                             dest_is_priv, fam);
2389                         if (sifa == NULL)
2390                                 continue;
2391                         if (sctp_is_addr_in_ep(inp, sifa)) {
2392                                 atomic_add_int(&sifa->refcount, 1);
2393                                 return (sifa);
2394                         }
2395                 }
2396         }
2397         /*
2398          * ok, now we now need to find one on the list of the addresses. We
2399          * can't get one on the emitting interface so let's find first a
2400          * preferred one. If not that an acceptable one otherwise... we
2401          * return NULL.
2402          */
2403         starting_point = inp->next_addr_touse;
2404 once_again:
2405         if (inp->next_addr_touse == NULL) {
2406                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2407                 resettotop = 1;
2408         }
2409         for (laddr = inp->next_addr_touse; laddr;
2410             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2411                 if (laddr->ifa == NULL) {
2412                         /* address has been removed */
2413                         continue;
2414                 }
2415                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2416                         /* address is being deleted */
2417                         continue;
2418                 }
2419                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2420                     dest_is_priv, fam);
2421                 if (sifa == NULL)
2422                         continue;
2423                 atomic_add_int(&sifa->refcount, 1);
2424                 return (sifa);
2425         }
2426         if (resettotop == 0) {
2427                 inp->next_addr_touse = NULL;
2428                 goto once_again;
2429         }
2430         inp->next_addr_touse = starting_point;
2431         resettotop = 0;
2432 once_again_too:
2433         if (inp->next_addr_touse == NULL) {
2434                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2435                 resettotop = 1;
2436         }
2437         /* ok, what about an acceptable address in the inp */
2438         for (laddr = inp->next_addr_touse; laddr;
2439             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2440                 if (laddr->ifa == NULL) {
2441                         /* address has been removed */
2442                         continue;
2443                 }
2444                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2445                         /* address is being deleted */
2446                         continue;
2447                 }
2448                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2449                     dest_is_priv, fam);
2450                 if (sifa == NULL)
2451                         continue;
2452                 atomic_add_int(&sifa->refcount, 1);
2453                 return (sifa);
2454         }
2455         if (resettotop == 0) {
2456                 inp->next_addr_touse = NULL;
2457                 goto once_again_too;
2458         }
2459         /*
2460          * no address bound can be a source for the destination we are in
2461          * trouble
2462          */
2463         return (NULL);
2464 }
2465
2466
2467
2468 static struct sctp_ifa *
2469 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2470     struct sctp_tcb *stcb,
2471     struct sctp_nets *net,
2472     sctp_route_t * ro,
2473     uint32_t vrf_id,
2474     uint8_t dest_is_priv,
2475     uint8_t dest_is_loop,
2476     int non_asoc_addr_ok,
2477     sa_family_t fam)
2478 {
2479         struct sctp_laddr *laddr, *starting_point;
2480         void *ifn;
2481         struct sctp_ifn *sctp_ifn;
2482         struct sctp_ifa *sctp_ifa, *sifa;
2483         uint8_t start_at_beginning = 0;
2484         struct sctp_vrf *vrf;
2485         uint32_t ifn_index;
2486
2487         /*
2488          * first question, is the ifn we will emit on in our list, if so, we
2489          * want that one.
2490          */
2491         vrf = sctp_find_vrf(vrf_id);
2492         if (vrf == NULL)
2493                 return (NULL);
2494
2495         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2496         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2497         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2498
2499         /*
2500          * first question, is the ifn we will emit on in our list?  If so,
2501          * we want that one. First we look for a preferred. Second, we go
2502          * for an acceptable.
2503          */
2504         if (sctp_ifn) {
2505                 /* first try for a preferred address on the ep */
2506                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2507                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2508                                 continue;
2509                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2510                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2511                                 if (sifa == NULL)
2512                                         continue;
2513                                 if ((non_asoc_addr_ok == 0) &&
2514                                     (sctp_is_addr_restricted(stcb, sifa))) {
2515                                         /* on the no-no list */
2516                                         continue;
2517                                 }
2518                                 atomic_add_int(&sifa->refcount, 1);
2519                                 return (sifa);
2520                         }
2521                 }
2522                 /* next try for an acceptable address on the ep */
2523                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2524                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2525                                 continue;
2526                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2527                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2528                                 if (sifa == NULL)
2529                                         continue;
2530                                 if ((non_asoc_addr_ok == 0) &&
2531                                     (sctp_is_addr_restricted(stcb, sifa))) {
2532                                         /* on the no-no list */
2533                                         continue;
2534                                 }
2535                                 atomic_add_int(&sifa->refcount, 1);
2536                                 return (sifa);
2537                         }
2538                 }
2539
2540         }
2541         /*
2542          * if we can't find one like that then we must look at all addresses
2543          * bound to pick one at first preferable then secondly acceptable.
2544          */
2545         starting_point = stcb->asoc.last_used_address;
2546 sctp_from_the_top:
2547         if (stcb->asoc.last_used_address == NULL) {
2548                 start_at_beginning = 1;
2549                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2550         }
2551         /* search beginning with the last used address */
2552         for (laddr = stcb->asoc.last_used_address; 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_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2563                 if (sifa == NULL)
2564                         continue;
2565                 if ((non_asoc_addr_ok == 0) &&
2566                     (sctp_is_addr_restricted(stcb, sifa))) {
2567                         /* on the no-no list */
2568                         continue;
2569                 }
2570                 stcb->asoc.last_used_address = laddr;
2571                 atomic_add_int(&sifa->refcount, 1);
2572                 return (sifa);
2573         }
2574         if (start_at_beginning == 0) {
2575                 stcb->asoc.last_used_address = NULL;
2576                 goto sctp_from_the_top;
2577         }
2578         /* now try for any higher scope than the destination */
2579         stcb->asoc.last_used_address = starting_point;
2580         start_at_beginning = 0;
2581 sctp_from_the_top2:
2582         if (stcb->asoc.last_used_address == NULL) {
2583                 start_at_beginning = 1;
2584                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2585         }
2586         /* search beginning with the last used address */
2587         for (laddr = stcb->asoc.last_used_address; laddr;
2588             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2589                 if (laddr->ifa == NULL) {
2590                         /* address has been removed */
2591                         continue;
2592                 }
2593                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2594                         /* address is being deleted */
2595                         continue;
2596                 }
2597                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2598                     dest_is_priv, fam);
2599                 if (sifa == NULL)
2600                         continue;
2601                 if ((non_asoc_addr_ok == 0) &&
2602                     (sctp_is_addr_restricted(stcb, sifa))) {
2603                         /* on the no-no list */
2604                         continue;
2605                 }
2606                 stcb->asoc.last_used_address = laddr;
2607                 atomic_add_int(&sifa->refcount, 1);
2608                 return (sifa);
2609         }
2610         if (start_at_beginning == 0) {
2611                 stcb->asoc.last_used_address = NULL;
2612                 goto sctp_from_the_top2;
2613         }
2614         return (NULL);
2615 }
2616
2617 static struct sctp_ifa *
2618 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2619     struct sctp_tcb *stcb,
2620     int non_asoc_addr_ok,
2621     uint8_t dest_is_loop,
2622     uint8_t dest_is_priv,
2623     int addr_wanted,
2624     sa_family_t fam,
2625     sctp_route_t * ro
2626 )
2627 {
2628         struct sctp_ifa *ifa, *sifa;
2629         int num_eligible_addr = 0;
2630
2631         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2632                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2633                     (non_asoc_addr_ok == 0))
2634                         continue;
2635                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2636                     dest_is_priv, fam);
2637                 if (sifa == NULL)
2638                         continue;
2639                 /*
2640                  * Check if the IPv6 address matches to next-hop. In the
2641                  * mobile case, old IPv6 address may be not deleted from the
2642                  * interface. Then, the interface has previous and new
2643                  * addresses.  We should use one corresponding to the
2644                  * next-hop.  (by micchie)
2645                  */
2646                 if (stcb && fam == AF_INET6 &&
2647                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2648                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2649                             == 0) {
2650                                 continue;
2651                         }
2652                 }
2653                 /* Avoid topologically incorrect IPv4 address */
2654                 if (stcb && fam == AF_INET &&
2655                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2656                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2657                                 continue;
2658                         }
2659                 }
2660                 if (stcb) {
2661                         if ((non_asoc_addr_ok == 0) &&
2662                             sctp_is_addr_restricted(stcb, sifa)) {
2663                                 /*
2664                                  * It is restricted for some reason..
2665                                  * probably not yet added.
2666                                  */
2667                                 continue;
2668                         }
2669                 }
2670                 if (num_eligible_addr >= addr_wanted) {
2671                         return (sifa);
2672                 }
2673                 num_eligible_addr++;
2674         }
2675         return (NULL);
2676 }
2677
2678
2679 static int
2680 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2681     struct sctp_tcb *stcb,
2682     int non_asoc_addr_ok,
2683     uint8_t dest_is_loop,
2684     uint8_t dest_is_priv,
2685     sa_family_t fam)
2686 {
2687         struct sctp_ifa *ifa, *sifa;
2688         int num_eligible_addr = 0;
2689
2690         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2691                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2692                     (non_asoc_addr_ok == 0)) {
2693                         continue;
2694                 }
2695                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2696                     dest_is_priv, fam);
2697                 if (sifa == NULL) {
2698                         continue;
2699                 }
2700                 if (stcb) {
2701                         if ((non_asoc_addr_ok == 0) &&
2702                             sctp_is_addr_restricted(stcb, sifa)) {
2703                                 /*
2704                                  * It is restricted for some reason..
2705                                  * probably not yet added.
2706                                  */
2707                                 continue;
2708                         }
2709                 }
2710                 num_eligible_addr++;
2711         }
2712         return (num_eligible_addr);
2713 }
2714
2715 static struct sctp_ifa *
2716 sctp_choose_boundall(struct sctp_inpcb *inp,
2717     struct sctp_tcb *stcb,
2718     struct sctp_nets *net,
2719     sctp_route_t * ro,
2720     uint32_t vrf_id,
2721     uint8_t dest_is_priv,
2722     uint8_t dest_is_loop,
2723     int non_asoc_addr_ok,
2724     sa_family_t fam)
2725 {
2726         int cur_addr_num = 0, num_preferred = 0;
2727         void *ifn;
2728         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2729         struct sctp_ifa *sctp_ifa, *sifa;
2730         uint32_t ifn_index;
2731         struct sctp_vrf *vrf;
2732
2733         /*-
2734          * For boundall we can use any address in the association.
2735          * If non_asoc_addr_ok is set we can use any address (at least in
2736          * theory). So we look for preferred addresses first. If we find one,
2737          * we use it. Otherwise we next try to get an address on the
2738          * interface, which we should be able to do (unless non_asoc_addr_ok
2739          * is false and we are routed out that way). In these cases where we
2740          * can't use the address of the interface we go through all the
2741          * ifn's looking for an address we can use and fill that in. Punting
2742          * means we send back address 0, which will probably cause problems
2743          * actually since then IP will fill in the address of the route ifn,
2744          * which means we probably already rejected it.. i.e. here comes an
2745          * abort :-<.
2746          */
2747         vrf = sctp_find_vrf(vrf_id);
2748         if (vrf == NULL)
2749                 return (NULL);
2750
2751         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2752         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2753         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2754         if (sctp_ifn == NULL) {
2755                 /* ?? We don't have this guy ?? */
2756                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2757                 goto bound_all_plan_b;
2758         }
2759         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2760             ifn_index, sctp_ifn->ifn_name);
2761
2762         if (net) {
2763                 cur_addr_num = net->indx_of_eligible_next_to_use;
2764         }
2765         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2766             stcb,
2767             non_asoc_addr_ok,
2768             dest_is_loop,
2769             dest_is_priv, fam);
2770         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2771             num_preferred, sctp_ifn->ifn_name);
2772         if (num_preferred == 0) {
2773                 /*
2774                  * no eligible addresses, we must use some other interface
2775                  * address if we can find one.
2776                  */
2777                 goto bound_all_plan_b;
2778         }
2779         /*
2780          * Ok we have num_eligible_addr set with how many we can use, this
2781          * may vary from call to call due to addresses being deprecated
2782          * etc..
2783          */
2784         if (cur_addr_num >= num_preferred) {
2785                 cur_addr_num = 0;
2786         }
2787         /*
2788          * select the nth address from the list (where cur_addr_num is the
2789          * nth) and 0 is the first one, 1 is the second one etc...
2790          */
2791         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2792
2793         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2794             dest_is_priv, cur_addr_num, fam, ro);
2795
2796         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2797         if (sctp_ifa) {
2798                 atomic_add_int(&sctp_ifa->refcount, 1);
2799                 if (net) {
2800                         /* save off where the next one we will want */
2801                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2802                 }
2803                 return (sctp_ifa);
2804         }
2805         /*
2806          * plan_b: Look at all interfaces and find a preferred address. If
2807          * no preferred fall through to plan_c.
2808          */
2809 bound_all_plan_b:
2810         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2811         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2812                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2813                     sctp_ifn->ifn_name);
2814                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2815                         /* wrong base scope */
2816                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2817                         continue;
2818                 }
2819                 if ((sctp_ifn == looked_at) && looked_at) {
2820                         /* already looked at this guy */
2821                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2822                         continue;
2823                 }
2824                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2825                     dest_is_loop, dest_is_priv, fam);
2826                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2827                     "Found ifn:%p %d preferred source addresses\n",
2828                     ifn, num_preferred);
2829                 if (num_preferred == 0) {
2830                         /* None on this interface. */
2831                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2832                         continue;
2833                 }
2834                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2835                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2836                     num_preferred, sctp_ifn, cur_addr_num);
2837
2838                 /*
2839                  * Ok we have num_eligible_addr set with how many we can
2840                  * use, this may vary from call to call due to addresses
2841                  * being deprecated etc..
2842                  */
2843                 if (cur_addr_num >= num_preferred) {
2844                         cur_addr_num = 0;
2845                 }
2846                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2847                     dest_is_priv, cur_addr_num, fam, ro);
2848                 if (sifa == NULL)
2849                         continue;
2850                 if (net) {
2851                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2852                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2853                             cur_addr_num);
2854                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2855                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2856                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2857                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2858                 }
2859                 atomic_add_int(&sifa->refcount, 1);
2860                 return (sifa);
2861
2862         }
2863
2864         /* plan_c: do we have an acceptable address on the emit interface */
2865         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
2866         if (emit_ifn == NULL) {
2867                 goto plan_d;
2868         }
2869         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
2870                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2871                     (non_asoc_addr_ok == 0))
2872                         continue;
2873                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
2874                     dest_is_priv, fam);
2875                 if (sifa == NULL)
2876                         continue;
2877                 if (stcb) {
2878                         if ((non_asoc_addr_ok == 0) &&
2879                             sctp_is_addr_restricted(stcb, sifa)) {
2880                                 /*
2881                                  * It is restricted for some reason..
2882                                  * probably not yet added.
2883                                  */
2884                                 continue;
2885                         }
2886                 }
2887                 atomic_add_int(&sifa->refcount, 1);
2888                 return (sifa);
2889         }
2890 plan_d:
2891         /*
2892          * plan_d: We are in trouble. No preferred address on the emit
2893          * interface. And not even a preferred address on all interfaces. Go
2894          * out and see if we can find an acceptable address somewhere
2895          * amongst all interfaces.
2896          */
2897         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
2898         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2899                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2900                         /* wrong base scope */
2901                         continue;
2902                 }
2903                 if ((sctp_ifn == looked_at) && looked_at)
2904                         /* already looked at this guy */
2905                         continue;
2906
2907                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2908                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2909                             (non_asoc_addr_ok == 0))
2910                                 continue;
2911                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
2912                             dest_is_loop,
2913                             dest_is_priv, fam);
2914                         if (sifa == NULL)
2915                                 continue;
2916                         if (stcb) {
2917                                 if ((non_asoc_addr_ok == 0) &&
2918                                     sctp_is_addr_restricted(stcb, sifa)) {
2919                                         /*
2920                                          * It is restricted for some
2921                                          * reason.. probably not yet added.
2922                                          */
2923                                         continue;
2924                                 }
2925                         }
2926                         atomic_add_int(&sifa->refcount, 1);
2927                         return (sifa);
2928                 }
2929         }
2930         /*
2931          * Ok we can find NO address to source from that is not on our
2932          * restricted list and non_asoc_address is NOT ok, or it is on our
2933          * restricted list. We can't source to it :-(
2934          */
2935         return (NULL);
2936 }
2937
2938
2939
2940 /* tcb may be NULL */
2941 struct sctp_ifa *
2942 sctp_source_address_selection(struct sctp_inpcb *inp,
2943     struct sctp_tcb *stcb,
2944     sctp_route_t * ro,
2945     struct sctp_nets *net,
2946     int non_asoc_addr_ok, uint32_t vrf_id)
2947 {
2948         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
2949         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
2950         struct sctp_ifa *answer;
2951         uint8_t dest_is_priv, dest_is_loop;
2952         sa_family_t fam;
2953
2954         /*-
2955          * Rules: - Find the route if needed, cache if I can. - Look at
2956          * interface address in route, Is it in the bound list. If so we
2957          * have the best source. - If not we must rotate amongst the
2958          * addresses.
2959          *
2960          * Cavets and issues
2961          *
2962          * Do we need to pay attention to scope. We can have a private address
2963          * or a global address we are sourcing or sending to. So if we draw
2964          * it out
2965          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
2966          * For V4
2967          *------------------------------------------
2968          *      source     *      dest  *  result
2969          * -----------------------------------------
2970          * <a>  Private    *    Global  *  NAT
2971          * -----------------------------------------
2972          * <b>  Private    *    Private *  No problem
2973          * -----------------------------------------
2974          * <c>  Global     *    Private *  Huh, How will this work?
2975          * -----------------------------------------
2976          * <d>  Global     *    Global  *  No Problem
2977          *------------------------------------------
2978          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
2979          * For V6
2980          *------------------------------------------
2981          *      source     *      dest  *  result
2982          * -----------------------------------------
2983          * <a>  Linklocal  *    Global  *
2984          * -----------------------------------------
2985          * <b>  Linklocal  * Linklocal  *  No problem
2986          * -----------------------------------------
2987          * <c>  Global     * Linklocal  *  Huh, How will this work?
2988          * -----------------------------------------
2989          * <d>  Global     *    Global  *  No Problem
2990          *------------------------------------------
2991          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
2992          *
2993          * And then we add to that what happens if there are multiple addresses
2994          * assigned to an interface. Remember the ifa on a ifn is a linked
2995          * list of addresses. So one interface can have more than one IP
2996          * address. What happens if we have both a private and a global
2997          * address? Do we then use context of destination to sort out which
2998          * one is best? And what about NAT's sending P->G may get you a NAT
2999          * translation, or should you select the G thats on the interface in
3000          * preference.
3001          *
3002          * Decisions:
3003          *
3004          * - count the number of addresses on the interface.
3005          * - if it is one, no problem except case <c>.
3006          *   For <a> we will assume a NAT out there.
3007          * - if there are more than one, then we need to worry about scope P
3008          *   or G. We should prefer G -> G and P -> P if possible.
3009          *   Then as a secondary fall back to mixed types G->P being a last
3010          *   ditch one.
3011          * - The above all works for bound all, but bound specific we need to
3012          *   use the same concept but instead only consider the bound
3013          *   addresses. If the bound set is NOT assigned to the interface then
3014          *   we must use rotation amongst the bound addresses..
3015          */
3016         if (ro->ro_rt == NULL) {
3017                 /*
3018                  * Need a route to cache.
3019                  */
3020                 SCTP_RTALLOC(ro, vrf_id);
3021         }
3022         if (ro->ro_rt == NULL) {
3023                 return (NULL);
3024         }
3025         fam = to->sin_family;
3026         dest_is_priv = dest_is_loop = 0;
3027         /* Setup our scopes for the destination */
3028         if (fam == AF_INET) {
3029                 /* Scope based on outbound address */
3030                 if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3031                         dest_is_priv = 1;
3032                 } else if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3033                         dest_is_loop = 1;
3034                         if (net != NULL) {
3035                                 /* mark it as local */
3036                                 net->addr_is_local = 1;
3037                         }
3038                 }
3039         } else if (fam == AF_INET6) {
3040                 /* Scope based on outbound address */
3041                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
3042                         /*
3043                          * If the route goes to the loopback address OR the
3044                          * address is a loopback address, we are loopback
3045                          * scope. But we don't use dest_is_priv (link local
3046                          * addresses).
3047                          */
3048                         dest_is_loop = 1;
3049                         if (net != NULL) {
3050                                 /* mark it as local */
3051                                 net->addr_is_local = 1;
3052                         }
3053                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3054                         dest_is_priv = 1;
3055                 }
3056         }
3057         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3058         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
3059         SCTP_IPI_ADDR_RLOCK();
3060         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3061                 /*
3062                  * Bound all case
3063                  */
3064                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3065                     dest_is_priv, dest_is_loop,
3066                     non_asoc_addr_ok, fam);
3067                 SCTP_IPI_ADDR_RUNLOCK();
3068                 return (answer);
3069         }
3070         /*
3071          * Subset bound case
3072          */
3073         if (stcb) {
3074                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3075                     vrf_id, dest_is_priv,
3076                     dest_is_loop,
3077                     non_asoc_addr_ok, fam);
3078         } else {
3079                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3080                     non_asoc_addr_ok,
3081                     dest_is_priv,
3082                     dest_is_loop, fam);
3083         }
3084         SCTP_IPI_ADDR_RUNLOCK();
3085         return (answer);
3086 }
3087
3088 static int
3089 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
3090 {
3091         struct cmsghdr cmh;
3092         int tlen, at;
3093
3094         tlen = SCTP_BUF_LEN(control);
3095         at = 0;
3096         /*
3097          * Independent of how many mbufs, find the c_type inside the control
3098          * structure and copy out the data.
3099          */
3100         while (at < tlen) {
3101                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3102                         /* not enough room for one more we are done. */
3103                         return (0);
3104                 }
3105                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3106                 if (((int)cmh.cmsg_len + at) > tlen) {
3107                         /*
3108                          * this is real messed up since there is not enough
3109                          * data here to cover the cmsg header. We are done.
3110                          */
3111                         return (0);
3112                 }
3113                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3114                     (c_type == cmh.cmsg_type)) {
3115                         /* found the one we want, copy it out */
3116                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
3117                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3118                                 /*
3119                                  * space of cmsg_len after header not big
3120                                  * enough
3121                                  */
3122                                 return (0);
3123                         }
3124                         m_copydata(control, at, cpsize, data);
3125                         return (1);
3126                 } else {
3127                         at += CMSG_ALIGN(cmh.cmsg_len);
3128                         if (cmh.cmsg_len == 0) {
3129                                 break;
3130                         }
3131                 }
3132         }
3133         /* not found */
3134         return (0);
3135 }
3136
3137 static struct mbuf *
3138 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3139     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3140 {
3141         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3142         struct sctp_state_cookie *stc;
3143         struct sctp_paramhdr *ph;
3144         uint8_t *foo;
3145         int sig_offset;
3146         uint16_t cookie_sz;
3147
3148         mret = NULL;
3149         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3150             sizeof(struct sctp_paramhdr)), 0,
3151             M_DONTWAIT, 1, MT_DATA);
3152         if (mret == NULL) {
3153                 return (NULL);
3154         }
3155         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3156         if (copy_init == NULL) {
3157                 sctp_m_freem(mret);
3158                 return (NULL);
3159         }
3160         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3161             M_DONTWAIT);
3162         if (copy_initack == NULL) {
3163                 sctp_m_freem(mret);
3164                 sctp_m_freem(copy_init);
3165                 return (NULL);
3166         }
3167         /* easy side we just drop it on the end */
3168         ph = mtod(mret, struct sctp_paramhdr *);
3169         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3170             sizeof(struct sctp_paramhdr);
3171         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3172             sizeof(struct sctp_paramhdr));
3173         ph->param_type = htons(SCTP_STATE_COOKIE);
3174         ph->param_length = 0;   /* fill in at the end */
3175         /* Fill in the stc cookie data */
3176         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3177
3178         /* tack the INIT and then the INIT-ACK onto the chain */
3179         cookie_sz = 0;
3180         m_at = mret;
3181         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3182                 cookie_sz += SCTP_BUF_LEN(m_at);
3183                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3184                         SCTP_BUF_NEXT(m_at) = copy_init;
3185                         break;
3186                 }
3187         }
3188
3189         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3190                 cookie_sz += SCTP_BUF_LEN(m_at);
3191                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3192                         SCTP_BUF_NEXT(m_at) = copy_initack;
3193                         break;
3194                 }
3195         }
3196
3197         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3198                 cookie_sz += SCTP_BUF_LEN(m_at);
3199                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3200                         break;
3201                 }
3202         }
3203         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3204         if (sig == NULL) {
3205                 /* no space, so free the entire chain */
3206                 sctp_m_freem(mret);
3207                 return (NULL);
3208         }
3209         SCTP_BUF_LEN(sig) = 0;
3210         SCTP_BUF_NEXT(m_at) = sig;
3211         sig_offset = 0;
3212         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3213         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3214         *signature = foo;
3215         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3216         cookie_sz += SCTP_SIGNATURE_SIZE;
3217         ph->param_length = htons(cookie_sz);
3218         return (mret);
3219 }
3220
3221
3222 static uint8_t
3223 sctp_get_ect(struct sctp_tcb *stcb,
3224     struct sctp_tmit_chunk *chk)
3225 {
3226         uint8_t this_random;
3227
3228         /* Huh? */
3229         if (sctp_ecn_enable == 0)
3230                 return (0);
3231
3232         if (sctp_ecn_nonce == 0)
3233                 /* no nonce, always return ECT0 */
3234                 return (SCTP_ECT0_BIT);
3235
3236         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
3237                 /* Peer does NOT support it, so we send a ECT0 only */
3238                 return (SCTP_ECT0_BIT);
3239         }
3240         if (chk == NULL)
3241                 return (SCTP_ECT0_BIT);
3242
3243         if ((stcb->asoc.hb_random_idx > 3) ||
3244             ((stcb->asoc.hb_random_idx == 3) &&
3245             (stcb->asoc.hb_ect_randombit > 7))) {
3246                 uint32_t rndval;
3247
3248 warp_drive_sa:
3249                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
3250                 memcpy(stcb->asoc.hb_random_values, &rndval,
3251                     sizeof(stcb->asoc.hb_random_values));
3252                 this_random = stcb->asoc.hb_random_values[0];
3253                 stcb->asoc.hb_random_idx = 0;
3254                 stcb->asoc.hb_ect_randombit = 0;
3255         } else {
3256                 if (stcb->asoc.hb_ect_randombit > 7) {
3257                         stcb->asoc.hb_ect_randombit = 0;
3258                         stcb->asoc.hb_random_idx++;
3259                         if (stcb->asoc.hb_random_idx > 3) {
3260                                 goto warp_drive_sa;
3261                         }
3262                 }
3263                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
3264         }
3265         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
3266                 if (chk != NULL)
3267                         /* ECN Nonce stuff */
3268                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
3269                 stcb->asoc.hb_ect_randombit++;
3270                 return (SCTP_ECT1_BIT);
3271         } else {
3272                 stcb->asoc.hb_ect_randombit++;
3273                 return (SCTP_ECT0_BIT);
3274         }
3275 }
3276
3277 static int
3278 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3279     struct sctp_tcb *stcb,      /* may be NULL */
3280     struct sctp_nets *net,
3281     struct sockaddr *to,
3282     struct mbuf *m,
3283     uint32_t auth_offset,
3284     struct sctp_auth_chunk *auth,
3285     int nofragment_flag,
3286     int ecn_ok,
3287     struct sctp_tmit_chunk *chk,
3288     int out_of_asoc_ok,
3289     int so_locked
3290 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3291     SCTP_UNUSED
3292 #endif
3293 )
3294 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3295 {
3296         /*
3297          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3298          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3299          * structure: - fill in the HMAC digest of any AUTH chunk in the
3300          * packet. - calculate and fill in the SCTP checksum. - prepend an
3301          * IP address header. - if boundall use INADDR_ANY. - if
3302          * boundspecific do source address selection. - set fragmentation
3303          * option for ipV4. - On return from IP output, check/adjust mtu
3304          * size of output interface and smallest_mtu size as well.
3305          */
3306         /* Will need ifdefs around this */
3307         struct mbuf *o_pak;
3308         struct mbuf *newm;
3309         struct sctphdr *sctphdr;
3310         int packet_length;
3311         uint32_t csum;
3312         int ret;
3313         uint32_t vrf_id;
3314         sctp_route_t *ro = NULL;
3315
3316         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3317                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3318                 sctp_m_freem(m);
3319                 return (EFAULT);
3320         }
3321         if (stcb) {
3322                 vrf_id = stcb->asoc.vrf_id;
3323         } else {
3324                 vrf_id = inp->def_vrf_id;
3325         }
3326
3327         /* fill in the HMAC digest for any AUTH chunk in the packet */
3328         if ((auth != NULL) && (stcb != NULL)) {
3329                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb);
3330         }
3331         /* Calculate the csum and fill in the length of the packet */
3332         sctphdr = mtod(m, struct sctphdr *);
3333         if (sctp_no_csum_on_loopback &&
3334             (stcb) &&
3335             (to->sa_family == AF_INET) &&
3336             (stcb->asoc.loopback_scope)) {
3337                 sctphdr->checksum = 0;
3338                 /*
3339                  * This can probably now be taken out since my audit shows
3340                  * no more bad pktlen's coming in. But we will wait a while
3341                  * yet.
3342                  */
3343                 packet_length = sctp_calculate_len(m);
3344         } else {
3345                 sctphdr->checksum = 0;
3346                 csum = sctp_calculate_sum(m, &packet_length, 0);
3347                 sctphdr->checksum = csum;
3348         }
3349
3350         if (to->sa_family == AF_INET) {
3351                 struct ip *ip = NULL;
3352                 sctp_route_t iproute;
3353                 uint8_t tos_value;
3354
3355                 newm = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
3356                 if (newm == NULL) {
3357                         sctp_m_freem(m);
3358                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3359                         return (ENOMEM);
3360                 }
3361                 SCTP_ALIGN_TO_END(newm, sizeof(struct ip));
3362                 SCTP_BUF_LEN(newm) = sizeof(struct ip);
3363                 packet_length += sizeof(struct ip);
3364                 SCTP_BUF_NEXT(newm) = m;
3365                 m = newm;
3366                 ip = mtod(m, struct ip *);
3367                 ip->ip_v = IPVERSION;
3368                 ip->ip_hl = (sizeof(struct ip) >> 2);
3369                 if (net) {
3370                         tos_value = net->tos_flowlabel & 0x000000ff;
3371                 } else {
3372                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3373                 }
3374                 if (nofragment_flag) {
3375 #if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__)
3376                         ip->ip_off = IP_DF;
3377 #else
3378                         ip->ip_off = htons(IP_DF);
3379 #endif
3380                 } else
3381                         ip->ip_off = 0;
3382
3383                 /* FreeBSD has a function for ip_id's */
3384                 ip->ip_id = ip_newid();
3385
3386                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3387                 ip->ip_len = packet_length;
3388                 if (stcb) {
3389                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3390                                 /* Enable ECN */
3391                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3392                         } else {
3393                                 /* No ECN */
3394                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3395                         }
3396                 } else {
3397                         /* no association at all */
3398                         ip->ip_tos = (tos_value & 0xfc);
3399                 }
3400                 ip->ip_p = IPPROTO_SCTP;
3401                 ip->ip_sum = 0;
3402                 if (net == NULL) {
3403                         ro = &iproute;
3404                         memset(&iproute, 0, sizeof(iproute));
3405                         memcpy(&ro->ro_dst, to, to->sa_len);
3406                 } else {
3407                         ro = (sctp_route_t *) & net->ro;
3408                 }
3409                 /* Now the address selection part */
3410                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3411
3412                 /* call the routine to select the src address */
3413                 if (net) {
3414                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3415                                 sctp_free_ifa(net->ro._s_addr);
3416                                 net->ro._s_addr = NULL;
3417                                 net->src_addr_selected = 0;
3418                                 if (ro->ro_rt) {
3419                                         RTFREE(ro->ro_rt);
3420                                         ro->ro_rt = NULL;
3421                                 }
3422                         }
3423                         if (net->src_addr_selected == 0) {
3424                                 if (out_of_asoc_ok) {
3425                                         /* do not cache */
3426                                         goto temp_v4_src;
3427                                 }
3428                                 /* Cache the source address */
3429                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3430                                     ro, net, out_of_asoc_ok,
3431                                     vrf_id);
3432                                 net->src_addr_selected = 1;
3433                         }
3434                         if (net->ro._s_addr == NULL) {
3435                                 /* No route to host */
3436                                 net->src_addr_selected = 0;
3437                                 goto no_route;
3438                         }
3439                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3440                 } else {
3441                         struct sctp_ifa *_lsrc;
3442
3443         temp_v4_src:
3444                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
3445                             net,
3446                             out_of_asoc_ok,
3447                             vrf_id);
3448                         if (_lsrc == NULL) {
3449                                 goto no_route;
3450                         }
3451                         ip->ip_src = _lsrc->address.sin.sin_addr;
3452                         sctp_free_ifa(_lsrc);
3453                 }
3454
3455                 /*
3456                  * If source address selection fails and we find no route
3457                  * then the ip_output should fail as well with a
3458                  * NO_ROUTE_TO_HOST type error. We probably should catch
3459                  * that somewhere and abort the association right away
3460                  * (assuming this is an INIT being sent).
3461                  */
3462                 if ((ro->ro_rt == NULL)) {
3463                         /*
3464                          * src addr selection failed to find a route (or
3465                          * valid source addr), so we can't get there from
3466                          * here (yet)!
3467                          */
3468         no_route:
3469                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3470                             "%s: dropped packet - no valid source addr\n",
3471                             __FUNCTION__);
3472                         if (net) {
3473                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3474                                     "Destination was ");
3475                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3476                                     &net->ro._l_addr.sa);
3477                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3478                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3479                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3480                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3481                                                     stcb,
3482                                                     SCTP_FAILED_THRESHOLD,
3483                                                     (void *)net,
3484                                                     so_locked);
3485                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3486                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3487                                                 /*
3488                                                  * JRS 5/14/07 - If a
3489                                                  * destination is
3490                                                  * unreachable, the PF bit
3491                                                  * is turned off.  This
3492                                                  * allows an unambiguous use
3493                                                  * of the PF bit for
3494                                                  * destinations that are
3495                                                  * reachable but potentially
3496                                                  * failed. If the
3497                                                  * destination is set to the
3498                                                  * unreachable state, also
3499                                                  * set the destination to
3500                                                  * the PF state.
3501                                                  */
3502                                                 /*
3503                                                  * Add debug message here if
3504                                                  * destination is not in PF
3505                                                  * state.
3506                                                  */
3507                                                 /*
3508                                                  * Stop any running T3
3509                                                  * timers here?
3510                                                  */
3511                                                 if (sctp_cmt_on_off && sctp_cmt_pf) {
3512                                                         net->dest_state &= ~SCTP_ADDR_PF;
3513                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3514                                                             net);
3515                                                 }
3516                                         }
3517                                 }
3518                                 if (stcb) {
3519                                         if (net == stcb->asoc.primary_destination) {
3520                                                 /* need a new primary */
3521                                                 struct sctp_nets *alt;
3522
3523                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3524                                                 if (alt != net) {
3525                                                         if (sctp_set_primary_addr(stcb,
3526                                                             (struct sockaddr *)NULL,
3527                                                             alt) == 0) {
3528                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3529                                                                 if (net->ro._s_addr) {
3530                                                                         sctp_free_ifa(net->ro._s_addr);
3531                                                                         net->ro._s_addr = NULL;
3532                                                                 }
3533                                                                 net->src_addr_selected = 0;
3534                                                         }
3535                                                 }
3536                                         }
3537                                 }
3538                         }
3539                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3540                         sctp_m_freem(m);
3541                         return (EHOSTUNREACH);
3542                 }
3543                 if (ro != &iproute) {
3544                         memcpy(&iproute, ro, sizeof(*ro));
3545                 }
3546                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3547                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3548                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3549                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3550                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3551                     ro->ro_rt);
3552
3553                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3554                         /* failed to prepend data, give up */
3555                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3556                         sctp_m_freem(m);
3557                         return (ENOMEM);
3558                 }
3559 #ifdef  SCTP_PACKET_LOGGING
3560                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
3561                         sctp_packet_log(m, packet_length);
3562 #endif
3563                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3564
3565                 /* send it out.  table id is taken from stcb */
3566                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3567
3568                 SCTP_STAT_INCR(sctps_sendpackets);
3569                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3570                 if (ret)
3571                         SCTP_STAT_INCR(sctps_senderrors);
3572
3573                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3574                 if (net == NULL) {
3575                         /* free tempy routes */
3576                         if (ro->ro_rt) {
3577                                 RTFREE(ro->ro_rt);
3578                                 ro->ro_rt = NULL;
3579                         }
3580                 } else {
3581                         /* PMTU check versus smallest asoc MTU goes here */
3582                         if ((ro->ro_rt != NULL) &&
3583                             (net->ro._s_addr)) {
3584                                 uint32_t mtu;
3585
3586                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3587                                 if (mtu &&
3588                                     (stcb->asoc.smallest_mtu > mtu)) {
3589 #ifdef SCTP_PRINT_FOR_B_AND_M
3590                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n",
3591                                             mtu);
3592 #endif
3593                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3594                                         net->mtu = mtu;
3595                                 }
3596                         } else if (ro->ro_rt == NULL) {
3597                                 /* route was freed */
3598                                 if (net->ro._s_addr &&
3599                                     net->src_addr_selected) {
3600                                         sctp_free_ifa(net->ro._s_addr);
3601                                         net->ro._s_addr = NULL;
3602                                 }
3603                                 net->src_addr_selected = 0;
3604                         }
3605                 }
3606                 return (ret);
3607         }
3608 #ifdef INET6
3609         else if (to->sa_family == AF_INET6) {
3610                 uint32_t flowlabel;
3611                 struct ip6_hdr *ip6h;
3612                 struct route_in6 ip6route;
3613                 struct ifnet *ifp;
3614                 u_char flowTop;
3615                 uint16_t flowBottom;
3616                 u_char tosBottom, tosTop;
3617                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3618                 int prev_scope = 0;
3619                 struct sockaddr_in6 lsa6_storage;
3620                 int error;
3621                 u_short prev_port = 0;
3622
3623                 if (net != NULL) {
3624                         flowlabel = net->tos_flowlabel;
3625                 } else {
3626                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3627                 }
3628
3629                 newm = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
3630                 if (newm == NULL) {
3631                         sctp_m_freem(m);
3632                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3633                         return (ENOMEM);
3634                 }
3635                 SCTP_ALIGN_TO_END(newm, sizeof(struct ip6_hdr));
3636                 SCTP_BUF_LEN(newm) = sizeof(struct ip6_hdr);
3637                 packet_length += sizeof(struct ip6_hdr);
3638                 SCTP_BUF_NEXT(newm) = m;
3639                 m = newm;
3640
3641                 ip6h = mtod(m, struct ip6_hdr *);
3642                 /*
3643                  * We assume here that inp_flow is in host byte order within
3644                  * the TCB!
3645                  */
3646                 flowBottom = flowlabel & 0x0000ffff;
3647                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3648                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3649                 /* protect *sin6 from overwrite */
3650                 sin6 = (struct sockaddr_in6 *)to;
3651                 tmp = *sin6;
3652                 sin6 = &tmp;
3653
3654                 /* KAME hack: embed scopeid */
3655                 if (sa6_embedscope(sin6, ip6_use_defzone) != 0) {
3656                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3657                         return (EINVAL);
3658                 }
3659                 if (net == NULL) {
3660                         memset(&ip6route, 0, sizeof(ip6route));
3661                         ro = (sctp_route_t *) & ip6route;
3662                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3663                 } else {
3664                         ro = (sctp_route_t *) & net->ro;
3665                 }
3666                 if (stcb != NULL) {
3667                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3668                                 /* Enable ECN */
3669                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3670                         } else {
3671                                 /* No ECN */
3672                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3673                         }
3674                 } else {
3675                         /* we could get no asoc if it is a O-O-T-B packet */
3676                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3677                 }
3678                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3679                 ip6h->ip6_nxt = IPPROTO_SCTP;
3680                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3681                 ip6h->ip6_dst = sin6->sin6_addr;
3682
3683                 /*
3684                  * Add SRC address selection here: we can only reuse to a
3685                  * limited degree the kame src-addr-sel, since we can try
3686                  * their selection but it may not be bound.
3687                  */
3688                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3689                 lsa6_tmp.sin6_family = AF_INET6;
3690                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3691                 lsa6 = &lsa6_tmp;
3692                 if (net) {
3693                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3694                                 sctp_free_ifa(net->ro._s_addr);
3695                                 net->ro._s_addr = NULL;
3696                                 net->src_addr_selected = 0;
3697                                 if (ro->ro_rt) {
3698                                         RTFREE(ro->ro_rt);
3699                                         ro->ro_rt = NULL;
3700                                 }
3701                         }
3702                         if (net->src_addr_selected == 0) {
3703                                 if (out_of_asoc_ok) {
3704                                         /* do not cache */
3705                                         goto temp_v6_src;
3706                                 }
3707                                 /* Cache the source address */
3708                                 net->ro._s_addr = sctp_source_address_selection(inp,
3709                                     stcb,
3710                                     ro,
3711                                     net,
3712                                     out_of_asoc_ok,
3713                                     vrf_id);
3714                                 net->src_addr_selected = 1;
3715                         }
3716                         if (net->ro._s_addr == NULL) {
3717                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3718                                 net->src_addr_selected = 0;
3719                                 goto no_route;
3720                         }
3721                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3722                 } else {
3723                         struct sctp_ifa *_lsrc;
3724
3725         temp_v6_src:
3726                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
3727                             net,
3728                             out_of_asoc_ok,
3729                             vrf_id);
3730                         if (_lsrc == NULL) {
3731                                 goto no_route;
3732                         }
3733                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3734                         sctp_free_ifa(_lsrc);
3735                 }
3736                 lsa6->sin6_port = inp->sctp_lport;
3737
3738                 if ((ro->ro_rt == NULL)) {
3739                         /*
3740                          * src addr selection failed to find a route (or
3741                          * valid source addr), so we can't get there from
3742                          * here!
3743                          */
3744                         goto no_route;
3745                 }
3746                 /*
3747                  * XXX: sa6 may not have a valid sin6_scope_id in the
3748                  * non-SCOPEDROUTING case.
3749                  */
3750                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3751                 lsa6_storage.sin6_family = AF_INET6;
3752                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3753                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3754                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3755                         sctp_m_freem(m);
3756                         return (error);
3757                 }
3758                 /* XXX */
3759                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3760                 lsa6_storage.sin6_port = inp->sctp_lport;
3761                 lsa6 = &lsa6_storage;
3762                 ip6h->ip6_src = lsa6->sin6_addr;
3763
3764                 /*
3765                  * We set the hop limit now since there is a good chance
3766                  * that our ro pointer is now filled
3767                  */
3768                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
3769                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
3770
3771 #ifdef SCTP_DEBUG
3772                 /* Copy to be sure something bad is not happening */
3773                 sin6->sin6_addr = ip6h->ip6_dst;
3774                 lsa6->sin6_addr = ip6h->ip6_src;
3775 #endif
3776
3777                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
3778                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
3779                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
3780                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
3781                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
3782                 if (net) {
3783                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3784                         /* preserve the port and scope for link local send */
3785                         prev_scope = sin6->sin6_scope_id;
3786                         prev_port = sin6->sin6_port;
3787                 }
3788                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3789                         /* failed to prepend data, give up */
3790                         sctp_m_freem(m);
3791                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3792                         return (ENOMEM);
3793                 }
3794 #ifdef  SCTP_PACKET_LOGGING
3795                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
3796                         sctp_packet_log(m, packet_length);
3797 #endif
3798                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3799
3800                 /* send it out. table id is taken from stcb */
3801                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp,
3802                     stcb, vrf_id);
3803
3804                 if (net) {
3805                         /* for link local this must be done */
3806                         sin6->sin6_scope_id = prev_scope;
3807                         sin6->sin6_port = prev_port;
3808                 }
3809                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
3810                 SCTP_STAT_INCR(sctps_sendpackets);
3811                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3812                 if (ret) {
3813                         SCTP_STAT_INCR(sctps_senderrors);
3814                 }
3815                 if (net == NULL) {
3816                         /* Now if we had a temp route free it */
3817                         if (ro->ro_rt) {
3818                                 RTFREE(ro->ro_rt);
3819                         }
3820                 } else {
3821                         /* PMTU check versus smallest asoc MTU goes here */
3822                         if (ro->ro_rt == NULL) {
3823                                 /* Route was freed */
3824                                 if (net->ro._s_addr &&
3825                                     net->src_addr_selected) {
3826                                         sctp_free_ifa(net->ro._s_addr);
3827                                         net->ro._s_addr = NULL;
3828                                 }
3829                                 net->src_addr_selected = 0;
3830                         }
3831                         if ((ro->ro_rt != NULL) &&
3832                             (net->ro._s_addr)) {
3833                                 uint32_t mtu;
3834
3835                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3836                                 if (mtu &&
3837                                     (stcb->asoc.smallest_mtu > mtu)) {
3838 #ifdef SCTP_PRINT_FOR_B_AND_M
3839                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
3840                                             mtu);
3841 #endif
3842                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3843                                         net->mtu = mtu;
3844                                 }
3845                         } else if (ifp) {
3846                                 if (ND_IFINFO(ifp)->linkmtu &&
3847                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
3848 #ifdef SCTP_PRINT_FOR_B_AND_M
3849                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
3850                                             ND_IFINFO(ifp)->linkmtu);
3851 #endif
3852                                         sctp_mtu_size_reset(inp,
3853                                             &stcb->asoc,
3854                                             ND_IFINFO(ifp)->linkmtu);
3855                                 }
3856                         }
3857                 }
3858                 return (ret);
3859         }
3860 #endif
3861         else {
3862                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
3863                     ((struct sockaddr *)to)->sa_family);
3864                 sctp_m_freem(m);
3865                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3866                 return (EFAULT);
3867         }
3868 }
3869
3870
3871 void
3872 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
3873 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3874     SCTP_UNUSED
3875 #endif
3876 )
3877 {
3878         struct mbuf *m, *m_at, *mp_last;
3879         struct sctp_nets *net;
3880         struct sctp_init_msg *initm;
3881         struct sctp_supported_addr_param *sup_addr;
3882         struct sctp_ecn_supported_param *ecn;
3883         struct sctp_prsctp_supported_param *prsctp;
3884         struct sctp_ecn_nonce_supported_param *ecn_nonce;
3885         struct sctp_supported_chunk_types_param *pr_supported;
3886         int cnt_inits_to = 0;
3887         int padval, ret;
3888         int num_ext;
3889         int p_len;
3890
3891         /* INIT's always go to the primary (and usually ONLY address) */
3892         mp_last = NULL;
3893         net = stcb->asoc.primary_destination;
3894         if (net == NULL) {
3895                 net = TAILQ_FIRST(&stcb->asoc.nets);
3896                 if (net == NULL) {
3897                         /* TSNH */
3898                         return;
3899                 }
3900                 /* we confirm any address we send an INIT to */
3901                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
3902                 (void)sctp_set_primary_addr(stcb, NULL, net);
3903         } else {
3904                 /* we confirm any address we send an INIT to */
3905                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
3906         }
3907         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
3908         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
3909                 /*
3910                  * special hook, if we are sending to link local it will not
3911                  * show up in our private address count.
3912                  */
3913                 struct sockaddr_in6 *sin6l;
3914
3915                 sin6l = &net->ro._l_addr.sin6;
3916                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
3917                         cnt_inits_to = 1;
3918         }
3919         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
3920                 /* This case should not happen */
3921                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
3922                 return;
3923         }
3924         /* start the INIT timer */
3925         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
3926
3927         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
3928         if (m == NULL) {
3929                 /* No memory, INIT timer will re-attempt. */
3930                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
3931                 return;
3932         }
3933         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
3934         /*
3935          * assume peer supports asconf in order to be able to queue local
3936          * address changes while an INIT is in flight and before the assoc
3937          * is established.
3938          */
3939         stcb->asoc.peer_supports_asconf = 1;
3940         /* Now lets put the SCTP header in place */
3941         initm = mtod(m, struct sctp_init_msg *);
3942         initm->sh.src_port = inp->sctp_lport;
3943         initm->sh.dest_port = stcb->rport;
3944         initm->sh.v_tag = 0;
3945         initm->sh.checksum = 0; /* calculate later */
3946         /* now the chunk header */
3947         initm->msg.ch.chunk_type = SCTP_INITIATION;
3948         initm->msg.ch.chunk_flags = 0;
3949         /* fill in later from mbuf we build */
3950         initm->msg.ch.chunk_length = 0;
3951         /* place in my tag */
3952         initm->msg.init.initiate_tag = htonl(stcb->asoc.my_vtag);
3953         /* set up some of the credits. */
3954         initm->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(inp->sctp_socket),
3955             SCTP_MINIMAL_RWND));
3956
3957         initm->msg.init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
3958         initm->msg.init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
3959         initm->msg.init.initial_tsn = htonl(stcb->asoc.init_seq_number);
3960         /* now the address restriction */
3961         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)initm +
3962             sizeof(*initm));
3963         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
3964         /* we support 2 types IPv6/IPv4 */
3965         sup_addr->ph.param_length = htons(sizeof(*sup_addr) +
3966             sizeof(uint16_t));
3967         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
3968         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
3969         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
3970
3971         if (inp->sctp_ep.adaptation_layer_indicator) {
3972                 struct sctp_adaptation_layer_indication *ali;
3973
3974                 ali = (struct sctp_adaptation_layer_indication *)(
3975                     (caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
3976                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
3977                 ali->ph.param_length = htons(sizeof(*ali));
3978                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
3979                 SCTP_BUF_LEN(m) += sizeof(*ali);
3980                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
3981                     sizeof(*ali));
3982         } else {
3983                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)sup_addr +
3984                     sizeof(*sup_addr) + sizeof(uint16_t));
3985         }
3986
3987         /* now any cookie time extensions */
3988         if (stcb->asoc.cookie_preserve_req) {
3989                 struct sctp_cookie_perserve_param *cookie_preserve;
3990
3991                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
3992                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
3993                 cookie_preserve->ph.param_length = htons(
3994                     sizeof(*cookie_preserve));
3995                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
3996                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
3997                 ecn = (struct sctp_ecn_supported_param *)(
3998                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
3999                 stcb->asoc.cookie_preserve_req = 0;
4000         }
4001         /* ECN parameter */
4002         if (sctp_ecn_enable == 1) {
4003                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4004                 ecn->ph.param_length = htons(sizeof(*ecn));
4005                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4006                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4007                     sizeof(*ecn));
4008         } else {
4009                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4010         }
4011         /* And now tell the peer we do pr-sctp */
4012         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4013         prsctp->ph.param_length = htons(sizeof(*prsctp));
4014         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4015
4016         /* And now tell the peer we do all the extensions */
4017         pr_supported = (struct sctp_supported_chunk_types_param *)
4018             ((caddr_t)prsctp + sizeof(*prsctp));
4019         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4020         num_ext = 0;
4021         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4022         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4023         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4024         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4025         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4026         if (!sctp_auth_disable)
4027                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4028         p_len = sizeof(*pr_supported) + num_ext;
4029         pr_supported->ph.param_length = htons(p_len);
4030         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4031         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4032
4033         /* ECN nonce: And now tell the peer we support ECN nonce */
4034         if (sctp_ecn_nonce) {
4035                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4036                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4037                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4038                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4039                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4040         }
4041         /* add authentication parameters */
4042         if (!sctp_auth_disable) {
4043                 struct sctp_auth_random *randp;
4044                 struct sctp_auth_hmac_algo *hmacs;
4045                 struct sctp_auth_chunk_list *chunks;
4046
4047                 /* attach RANDOM parameter, if available */
4048                 if (stcb->asoc.authinfo.random != NULL) {
4049                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4050                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4051 #ifdef SCTP_AUTH_DRAFT_04
4052                         randp->ph.param_type = htons(SCTP_RANDOM);
4053                         randp->ph.param_length = htons(p_len);
4054                         bcopy(stcb->asoc.authinfo.random->key,
4055                             randp->random_data,
4056                             stcb->asoc.authinfo.random_len);
4057 #else
4058                         /* random key already contains the header */
4059                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4060 #endif
4061                         /* zero out any padding required */
4062                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4063                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4064                 }
4065                 /* add HMAC_ALGO parameter */
4066                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4067                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4068                     (uint8_t *) hmacs->hmac_ids);
4069                 if (p_len > 0) {
4070                         p_len += sizeof(*hmacs);
4071                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4072                         hmacs->ph.param_length = htons(p_len);
4073                         /* zero out any padding required */
4074                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4075                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4076                 }
4077                 /* add CHUNKS parameter */
4078                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4079                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4080                     chunks->chunk_types);
4081                 if (p_len > 0) {
4082                         p_len += sizeof(*chunks);
4083                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4084                         chunks->ph.param_length = htons(p_len);
4085                         /* zero out any padding required */
4086                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4087                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4088                 }
4089         }
4090         m_at = m;
4091         /* now the addresses */
4092         {
4093                 struct sctp_scoping scp;
4094
4095                 /*
4096                  * To optimize this we could put the scoping stuff into a
4097                  * structure and remove the individual uint8's from the
4098                  * assoc structure. Then we could just sifa in the address
4099                  * within the stcb.. but for now this is a quick hack to get
4100                  * the address stuff teased apart.
4101                  */
4102                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4103                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4104                 scp.loopback_scope = stcb->asoc.loopback_scope;
4105                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4106                 scp.local_scope = stcb->asoc.local_scope;
4107                 scp.site_scope = stcb->asoc.site_scope;
4108
4109                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4110         }
4111
4112         /* calulate the size and update pkt header and chunk header */
4113         p_len = 0;
4114         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4115                 if (SCTP_BUF_NEXT(m_at) == NULL)
4116                         mp_last = m_at;
4117                 p_len += SCTP_BUF_LEN(m_at);
4118         }
4119         initm->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
4120         /*
4121          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4122          * here since the timer will drive a retranmission.
4123          */
4124
4125         /* I don't expect this to execute but we will be safe here */
4126         padval = p_len % 4;
4127         if ((padval) && (mp_last)) {
4128                 /*
4129                  * The compiler worries that mp_last may not be set even
4130                  * though I think it is impossible :-> however we add
4131                  * mp_last here just in case.
4132                  */
4133                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4134                 if (ret) {
4135                         /* Houston we have a problem, no space */
4136                         sctp_m_freem(m);
4137                         return;
4138                 }
4139                 p_len += padval;
4140         }
4141         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4142         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4143             (struct sockaddr *)&net->ro._l_addr,
4144             m, 0, NULL, 0, 0, NULL, 0, so_locked);
4145         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4146         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4147         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4148         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4149 }
4150
4151 struct mbuf *
4152 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4153     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp)
4154 {
4155         /*
4156          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4157          * being equal to the beginning of the params i.e. (iphlen +
4158          * sizeof(struct sctp_init_msg) parse through the parameters to the
4159          * end of the mbuf verifying that all parameters are known.
4160          *
4161          * For unknown parameters build and return a mbuf with
4162          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4163          * processing this chunk stop, and set *abort_processing to 1.
4164          *
4165          * By having param_offset be pre-set to where parameters begin it is
4166          * hoped that this routine may be reused in the future by new
4167          * features.
4168          */
4169         struct sctp_paramhdr *phdr, params;
4170
4171         struct mbuf *mat, *op_err;
4172         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4173         int at, limit, pad_needed;
4174         uint16_t ptype, plen, padded_size;
4175         int err_at;
4176
4177         *abort_processing = 0;
4178         mat = in_initpkt;
4179         err_at = 0;
4180         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4181         at = param_offset;
4182         op_err = NULL;
4183         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4184         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4185         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4186                 ptype = ntohs(phdr->param_type);
4187                 plen = ntohs(phdr->param_length);
4188                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4189                         /* wacked parameter */
4190                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4191                         goto invalid_size;
4192                 }
4193                 limit -= SCTP_SIZE32(plen);
4194                 /*-
4195                  * All parameters for all chunks that we know/understand are
4196                  * listed here. We process them other places and make
4197                  * appropriate stop actions per the upper bits. However this
4198                  * is the generic routine processor's can call to get back
4199                  * an operr.. to either incorporate (init-ack) or send.
4200                  */
4201                 padded_size = SCTP_SIZE32(plen);
4202                 switch (ptype) {
4203                         /* Param's with variable size */
4204                 case SCTP_HEARTBEAT_INFO:
4205                 case SCTP_STATE_COOKIE:
4206                 case SCTP_UNRECOG_PARAM:
4207                 case SCTP_ERROR_CAUSE_IND:
4208                         /* ok skip fwd */
4209                         at += padded_size;
4210                         break;
4211                         /* Param's with variable size within a range */
4212                 case SCTP_CHUNK_LIST:
4213                 case SCTP_SUPPORTED_CHUNK_EXT:
4214                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4215                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4216                                 goto invalid_size;
4217                         }
4218                         at += padded_size;
4219                         break;
4220                 case SCTP_SUPPORTED_ADDRTYPE:
4221                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4222                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4223                                 goto invalid_size;
4224                         }
4225                         at += padded_size;
4226                         break;
4227                 case SCTP_RANDOM:
4228                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4229                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4230                                 goto invalid_size;
4231                         }
4232                         at += padded_size;
4233                         break;
4234                 case SCTP_SET_PRIM_ADDR:
4235                 case SCTP_DEL_IP_ADDRESS:
4236                 case SCTP_ADD_IP_ADDRESS:
4237                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4238                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4239                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4240                                 goto invalid_size;
4241                         }
4242                         at += padded_size;
4243                         break;
4244                         /* Param's with a fixed size */
4245                 case SCTP_IPV4_ADDRESS:
4246                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4247                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4248                                 goto invalid_size;
4249                         }
4250                         at += padded_size;
4251                         break;
4252                 case SCTP_IPV6_ADDRESS:
4253                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4254                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4255                                 goto invalid_size;
4256                         }
4257                         at += padded_size;
4258                         break;
4259                 case SCTP_COOKIE_PRESERVE:
4260                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4261                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4262                                 goto invalid_size;
4263                         }
4264                         at += padded_size;
4265                         break;
4266                 case SCTP_ECN_NONCE_SUPPORTED:
4267                 case SCTP_PRSCTP_SUPPORTED:
4268                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4269                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp %d\n", plen);
4270                                 goto invalid_size;
4271                         }
4272                         at += padded_size;
4273                         break;
4274                 case SCTP_ECN_CAPABLE:
4275                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4276                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4277                                 goto invalid_size;
4278                         }
4279                         at += padded_size;
4280                         break;
4281                 case SCTP_ULP_ADAPTATION:
4282                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4283                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4284                                 goto invalid_size;
4285                         }
4286                         at += padded_size;
4287                         break;
4288                 case SCTP_SUCCESS_REPORT:
4289                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4290                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4291                                 goto invalid_size;
4292                         }
4293                         at += padded_size;
4294                         break;
4295                 case SCTP_HOSTNAME_ADDRESS:
4296                         {
4297                                 /* We can NOT handle HOST NAME addresses!! */
4298                                 int l_len;
4299
4300                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4301                                 *abort_processing = 1;
4302                                 if (op_err == NULL) {
4303                                         /* Ok need to try to get a mbuf */
4304                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4305                                         l_len += plen;
4306                                         l_len += sizeof(struct sctp_paramhdr);
4307                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4308                                         if (op_err) {
4309                                                 SCTP_BUF_LEN(op_err) = 0;
4310                                                 /*
4311                                                  * pre-reserve space for ip
4312                                                  * and sctp header  and
4313                                                  * chunk hdr
4314                                                  */
4315                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4316                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4317                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4318                                         }
4319                                 }
4320                                 if (op_err) {
4321                                         /* If we have space */
4322                                         struct sctp_paramhdr s;
4323
4324                                         if (err_at % 4) {
4325                                                 uint32_t cpthis = 0;
4326
4327                                                 pad_needed = 4 - (err_at % 4);
4328                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4329                                                 err_at += pad_needed;
4330                                         }
4331                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4332                                         s.param_length = htons(sizeof(s) + plen);
4333                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4334                                         err_at += sizeof(s);
4335                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4336                                         if (phdr == NULL) {
4337                                                 sctp_m_freem(op_err);
4338                                                 /*
4339                                                  * we are out of memory but
4340                                                  * we still need to have a
4341                                                  * look at what to do (the
4342                                                  * system is in trouble
4343                                                  * though).
4344                                                  */
4345                                                 return (NULL);
4346                                         }
4347                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4348                                         err_at += plen;
4349                                 }
4350                                 return (op_err);
4351                                 break;
4352                         }
4353                 default:
4354                         /*
4355                          * we do not recognize the parameter figure out what
4356                          * we do.
4357                          */
4358                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4359                         if ((ptype & 0x4000) == 0x4000) {
4360                                 /* Report bit is set?? */
4361                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4362                                 if (op_err == NULL) {
4363                                         int l_len;
4364
4365                                         /* Ok need to try to get an mbuf */
4366                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4367                                         l_len += plen;
4368                                         l_len += sizeof(struct sctp_paramhdr);
4369                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4370                                         if (op_err) {
4371                                                 SCTP_BUF_LEN(op_err) = 0;
4372                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4373                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4374                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4375                                         }
4376                                 }
4377                                 if (op_err) {
4378                                         /* If we have space */
4379                                         struct sctp_paramhdr s;
4380
4381                                         if (err_at % 4) {
4382                                                 uint32_t cpthis = 0;
4383
4384                                                 pad_needed = 4 - (err_at % 4);
4385                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4386                                                 err_at += pad_needed;
4387                                         }
4388                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4389                                         s.param_length = htons(sizeof(s) + plen);
4390                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4391                                         err_at += sizeof(s);
4392                                         if (plen > sizeof(tempbuf)) {
4393                                                 plen = sizeof(tempbuf);
4394                                         }
4395                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4396                                         if (phdr == NULL) {
4397                                                 sctp_m_freem(op_err);
4398                                                 /*
4399                                                  * we are out of memory but
4400                                                  * we still need to have a
4401                                                  * look at what to do (the
4402                                                  * system is in trouble
4403                                                  * though).
4404                                                  */
4405                                                 op_err = NULL;
4406                                                 goto more_processing;
4407                                         }
4408                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4409                                         err_at += plen;
4410                                 }
4411                         }
4412         more_processing:
4413                         if ((ptype & 0x8000) == 0x0000) {
4414                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4415                                 return (op_err);
4416                         } else {
4417                                 /* skip this chunk and continue processing */
4418                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4419                                 at += SCTP_SIZE32(plen);
4420                         }
4421                         break;
4422
4423                 }
4424                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4425         }
4426         return (op_err);
4427 invalid_size:
4428         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4429         *abort_processing = 1;
4430         if ((op_err == NULL) && phdr) {
4431                 int l_len;
4432
4433                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4434                 l_len += (2 * sizeof(struct sctp_paramhdr));
4435                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4436                 if (op_err) {
4437                         SCTP_BUF_LEN(op_err) = 0;
4438                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4439                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4440                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4441                 }
4442         }
4443         if ((op_err) && phdr) {
4444                 struct sctp_paramhdr s;
4445
4446                 if (err_at % 4) {
4447                         uint32_t cpthis = 0;
4448
4449                         pad_needed = 4 - (err_at % 4);
4450                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4451                         err_at += pad_needed;
4452                 }
4453                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4454                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4455                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4456                 err_at += sizeof(s);
4457                 /* Only copy back the p-hdr that caused the issue */
4458                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4459         }
4460         return (op_err);
4461 }
4462
4463 static int
4464 sctp_are_there_new_addresses(struct sctp_association *asoc,
4465     struct mbuf *in_initpkt, int iphlen, int offset)
4466 {
4467         /*
4468          * Given a INIT packet, look through the packet to verify that there
4469          * are NO new addresses. As we go through the parameters add reports
4470          * of any un-understood parameters that require an error.  Also we
4471          * must return (1) to drop the packet if we see a un-understood
4472          * parameter that tells us to drop the chunk.
4473          */
4474         struct sockaddr_in sin4, *sa4;
4475         struct sockaddr_in6 sin6, *sa6;
4476         struct sockaddr *sa_touse;
4477         struct sockaddr *sa;
4478         struct sctp_paramhdr *phdr, params;
4479         struct ip *iph;
4480         struct mbuf *mat;
4481         uint16_t ptype, plen;
4482         int err_at;
4483         uint8_t fnd;
4484         struct sctp_nets *net;
4485
4486         memset(&sin4, 0, sizeof(sin4));
4487         memset(&sin6, 0, sizeof(sin6));
4488         sin4.sin_family = AF_INET;
4489         sin4.sin_len = sizeof(sin4);
4490         sin6.sin6_family = AF_INET6;
4491         sin6.sin6_len = sizeof(sin6);
4492
4493         sa_touse = NULL;
4494         /* First what about the src address of the pkt ? */
4495         iph = mtod(in_initpkt, struct ip *);
4496         if (iph->ip_v == IPVERSION) {
4497                 /* source addr is IPv4 */
4498                 sin4.sin_addr = iph->ip_src;
4499                 sa_touse = (struct sockaddr *)&sin4;
4500         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
4501                 /* source addr is IPv6 */
4502                 struct ip6_hdr *ip6h;
4503
4504                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4505                 sin6.sin6_addr = ip6h->ip6_src;
4506                 sa_touse = (struct sockaddr *)&sin6;
4507         } else {
4508                 return (1);
4509         }
4510
4511         fnd = 0;
4512         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4513                 sa = (struct sockaddr *)&net->ro._l_addr;
4514                 if (sa->sa_family == sa_touse->sa_family) {
4515                         if (sa->sa_family == AF_INET) {
4516                                 sa4 = (struct sockaddr_in *)sa;
4517                                 if (sa4->sin_addr.s_addr ==
4518                                     sin4.sin_addr.s_addr) {
4519                                         fnd = 1;
4520                                         break;
4521                                 }
4522                         } else if (sa->sa_family == AF_INET6) {
4523                                 sa6 = (struct sockaddr_in6 *)sa;
4524                                 if (SCTP6_ARE_ADDR_EQUAL(&sa6->sin6_addr,
4525                                     &sin6.sin6_addr)) {
4526                                         fnd = 1;
4527                                         break;
4528                                 }
4529                         }
4530                 }
4531         }
4532         if (fnd == 0) {
4533                 /* New address added! no need to look futher. */
4534                 return (1);
4535         }
4536         /* Ok so far lets munge through the rest of the packet */
4537         mat = in_initpkt;
4538         err_at = 0;
4539         sa_touse = NULL;
4540         offset += sizeof(struct sctp_init_chunk);
4541         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4542         while (phdr) {
4543                 ptype = ntohs(phdr->param_type);
4544                 plen = ntohs(phdr->param_length);
4545                 if (ptype == SCTP_IPV4_ADDRESS) {
4546                         struct sctp_ipv4addr_param *p4, p4_buf;
4547
4548                         phdr = sctp_get_next_param(mat, offset,
4549                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4550                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4551                             phdr == NULL) {
4552                                 return (1);
4553                         }
4554                         p4 = (struct sctp_ipv4addr_param *)phdr;
4555                         sin4.sin_addr.s_addr = p4->addr;
4556                         sa_touse = (struct sockaddr *)&sin4;
4557                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4558                         struct sctp_ipv6addr_param *p6, p6_buf;
4559
4560                         phdr = sctp_get_next_param(mat, offset,
4561                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4562                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4563                             phdr == NULL) {
4564                                 return (1);
4565                         }
4566                         p6 = (struct sctp_ipv6addr_param *)phdr;
4567                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4568                             sizeof(p6->addr));
4569                         sa_touse = (struct sockaddr *)&sin4;
4570                 }
4571                 if (sa_touse) {
4572                         /* ok, sa_touse points to one to check */
4573                         fnd = 0;
4574                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4575                                 sa = (struct sockaddr *)&net->ro._l_addr;
4576                                 if (sa->sa_family != sa_touse->sa_family) {
4577                                         continue;
4578                                 }
4579                                 if (sa->sa_family == AF_INET) {
4580                                         sa4 = (struct sockaddr_in *)sa;
4581                                         if (sa4->sin_addr.s_addr ==
4582                                             sin4.sin_addr.s_addr) {
4583                                                 fnd = 1;
4584                                                 break;
4585                                         }
4586                                 } else if (sa->sa_family == AF_INET6) {
4587                                         sa6 = (struct sockaddr_in6 *)sa;
4588                                         if (SCTP6_ARE_ADDR_EQUAL(
4589                                             &sa6->sin6_addr, &sin6.sin6_addr)) {
4590                                                 fnd = 1;
4591                                                 break;
4592                                         }
4593                                 }
4594                         }
4595                         if (!fnd) {
4596                                 /* New addr added! no need to look further */
4597                                 return (1);
4598                         }
4599                 }
4600                 offset += SCTP_SIZE32(plen);
4601                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4602         }
4603         return (0);
4604 }
4605
4606 /*
4607  * Given a MBUF chain that was sent into us containing an INIT. Build a
4608  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4609  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4610  * message (i.e. the struct sctp_init_msg).
4611  */
4612 void
4613 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4614     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4615     struct sctp_init_chunk *init_chk, uint32_t vrf_id, int hold_inp_lock)
4616 {
4617         struct sctp_association *asoc;
4618         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4619         struct sctp_init_msg *initackm_out;
4620         struct sctp_ecn_supported_param *ecn;
4621         struct sctp_prsctp_supported_param *prsctp;
4622         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4623         struct sctp_supported_chunk_types_param *pr_supported;
4624         struct sockaddr_storage store;
4625         struct sockaddr_in *sin;
4626         struct sockaddr_in6 *sin6;
4627         sctp_route_t *ro;
4628         struct ip *iph;
4629         struct ip6_hdr *ip6;
4630         struct sockaddr *to;
4631         struct sctp_state_cookie stc;
4632         struct sctp_nets *net = NULL;
4633         uint8_t *signature = NULL;
4634         int cnt_inits_to = 0;
4635         uint16_t his_limit, i_want;
4636         int abort_flag, padval;
4637         int num_ext;
4638         int p_len;
4639         struct socket *so;
4640
4641         if (stcb)
4642                 asoc = &stcb->asoc;
4643         else
4644                 asoc = NULL;
4645         mp_last = NULL;
4646         if ((asoc != NULL) &&
4647             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4648             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4649                 /* new addresses, out of here in non-cookie-wait states */
4650                 /*
4651                  * Send a ABORT, we don't add the new address error clause
4652                  * though we even set the T bit and copy in the 0 tag.. this
4653                  * looks no different than if no listener was present.
4654                  */
4655                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id);
4656                 return;
4657         }
4658         abort_flag = 0;
4659         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4660             (offset + sizeof(struct sctp_init_chunk)),
4661             &abort_flag, (struct sctp_chunkhdr *)init_chk);
4662         if (abort_flag) {
4663                 sctp_send_abort(init_pkt, iphlen, sh,
4664                     init_chk->init.initiate_tag, op_err, vrf_id);
4665                 return;
4666         }
4667         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4668         if (m == NULL) {
4669                 /* No memory, INIT timer will re-attempt. */
4670                 if (op_err)
4671                         sctp_m_freem(op_err);
4672                 return;
4673         }
4674         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
4675
4676         /* the time I built cookie */
4677         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
4678
4679         /* populate any tie tags */
4680         if (asoc != NULL) {
4681                 /* unlock before tag selections */
4682                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
4683                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
4684                 stc.cookie_life = asoc->cookie_life;
4685                 net = asoc->primary_destination;
4686         } else {
4687                 stc.tie_tag_my_vtag = 0;
4688                 stc.tie_tag_peer_vtag = 0;
4689                 /* life I will award this cookie */
4690                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
4691         }
4692
4693         /* copy in the ports for later check */
4694         stc.myport = sh->dest_port;
4695         stc.peerport = sh->src_port;
4696
4697         /*
4698          * If we wanted to honor cookie life extentions, we would add to
4699          * stc.cookie_life. For now we should NOT honor any extension
4700          */
4701         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
4702         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
4703                 struct inpcb *in_inp;
4704
4705                 /* Its a V6 socket */
4706                 in_inp = (struct inpcb *)inp;
4707                 stc.ipv6_addr_legal = 1;
4708                 /* Now look at the binding flag to see if V4 will be legal */
4709                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
4710                         stc.ipv4_addr_legal = 1;
4711                 } else {
4712                         /* V4 addresses are NOT legal on the association */
4713                         stc.ipv4_addr_legal = 0;
4714                 }
4715         } else {
4716                 /* Its a V4 socket, no - V6 */
4717                 stc.ipv4_addr_legal = 1;
4718                 stc.ipv6_addr_legal = 0;
4719         }
4720
4721 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
4722         stc.ipv4_scope = 1;
4723 #else
4724         stc.ipv4_scope = 0;
4725 #endif
4726         /* now for scope setup */
4727         memset((caddr_t)&store, 0, sizeof(store));
4728         sin = (struct sockaddr_in *)&store;
4729         sin6 = (struct sockaddr_in6 *)&store;
4730         if (net == NULL) {
4731                 to = (struct sockaddr *)&store;
4732                 iph = mtod(init_pkt, struct ip *);
4733                 if (iph->ip_v == IPVERSION) {
4734                         struct sctp_ifa *addr;
4735                         sctp_route_t iproute;
4736
4737                         sin->sin_family = AF_INET;
4738                         sin->sin_len = sizeof(struct sockaddr_in);
4739                         sin->sin_port = sh->src_port;
4740                         sin->sin_addr = iph->ip_src;
4741                         /* lookup address */
4742                         stc.address[0] = sin->sin_addr.s_addr;
4743                         stc.address[1] = 0;
4744                         stc.address[2] = 0;
4745                         stc.address[3] = 0;
4746                         stc.addr_type = SCTP_IPV4_ADDRESS;
4747                         /* local from address */
4748                         memset(&iproute, 0, sizeof(iproute));
4749                         ro = &iproute;
4750                         memcpy(&ro->ro_dst, sin, sizeof(*sin));
4751                         addr = sctp_source_address_selection(inp, NULL,
4752                             ro, NULL, 0,
4753                             vrf_id);
4754                         if (addr == NULL)
4755                                 return;
4756
4757                         if (ro->ro_rt) {
4758                                 RTFREE(ro->ro_rt);
4759                                 ro->ro_rt = NULL;
4760                         }
4761                         stc.laddress[0] = addr->address.sin.sin_addr.s_addr;
4762                         stc.laddress[1] = 0;
4763                         stc.laddress[2] = 0;
4764                         stc.laddress[3] = 0;
4765                         stc.laddr_type = SCTP_IPV4_ADDRESS;
4766                         /* scope_id is only for v6 */
4767                         stc.scope_id = 0;
4768 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
4769                         if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
4770                                 stc.ipv4_scope = 1;
4771                         }
4772 #else
4773                         stc.ipv4_scope = 1;
4774 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
4775                         /* Must use the address in this case */
4776                         if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
4777                                 stc.loopback_scope = 1;
4778                                 stc.ipv4_scope = 1;
4779                                 stc.site_scope = 1;
4780                                 stc.local_scope = 0;
4781                         }
4782                         sctp_free_ifa(addr);
4783                 } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
4784                         struct sctp_ifa *addr;
4785                         struct route_in6 iproute6;
4786
4787                         ip6 = mtod(init_pkt, struct ip6_hdr *);
4788                         sin6->sin6_family = AF_INET6;
4789                         sin6->sin6_len = sizeof(struct sockaddr_in6);
4790                         sin6->sin6_port = sh->src_port;
4791                         sin6->sin6_addr = ip6->ip6_src;
4792                         /* lookup address */
4793                         memcpy(&stc.address, &sin6->sin6_addr,
4794                             sizeof(struct in6_addr));
4795                         sin6->sin6_scope_id = 0;
4796                         stc.addr_type = SCTP_IPV6_ADDRESS;
4797                         stc.scope_id = 0;
4798                         if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
4799                                 stc.loopback_scope = 1;
4800                                 stc.local_scope = 0;
4801                                 stc.site_scope = 1;
4802                                 stc.ipv4_scope = 1;
4803                         } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
4804                                 /*
4805                                  * If the new destination is a LINK_LOCAL we
4806                                  * must have common both site and local
4807                                  * scope. Don't set local scope though since
4808                                  * we must depend on the source to be added
4809                                  * implicitly. We cannot assure just because
4810                                  * we share one link that all links are
4811                                  * common.
4812                                  */
4813                                 stc.local_scope = 0;
4814                                 stc.site_scope = 1;
4815                                 stc.ipv4_scope = 1;
4816                                 /*
4817                                  * we start counting for the private address
4818                                  * stuff at 1. since the link local we
4819                                  * source from won't show up in our scoped
4820                                  * count.
4821                                  */
4822                                 cnt_inits_to = 1;
4823                                 /* pull out the scope_id from incoming pkt */
4824                                 /* FIX ME: does this have scope from rcvif? */
4825                                 (void)sa6_recoverscope(sin6);
4826
4827                                 sa6_embedscope(sin6, ip6_use_defzone);
4828                                 stc.scope_id = sin6->sin6_scope_id;
4829                         } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
4830                                 /*
4831                                  * If the new destination is SITE_LOCAL then
4832                                  * we must have site scope in common.
4833                                  */
4834                                 stc.site_scope = 1;
4835                         }
4836                         /* local from address */
4837                         memset(&iproute6, 0, sizeof(iproute6));
4838                         ro = (sctp_route_t *) & iproute6;
4839                         memcpy(&ro->ro_dst, sin6, sizeof(*sin6));
4840                         addr = sctp_source_address_selection(inp, NULL,
4841                             ro, NULL, 0, vrf_id);
4842                         if (addr == NULL)
4843                                 return;
4844
4845                         if (ro->ro_rt) {
4846                                 RTFREE(ro->ro_rt);
4847                                 ro->ro_rt = NULL;
4848                         }
4849                         memcpy(&stc.laddress, &addr->address.sin6.sin6_addr, sizeof(struct in6_addr));
4850                         stc.laddr_type = SCTP_IPV6_ADDRESS;
4851                         sctp_free_ifa(addr);
4852                 }
4853         } else {
4854                 /* set the scope per the existing tcb */
4855                 struct sctp_nets *lnet;
4856
4857                 stc.loopback_scope = asoc->loopback_scope;
4858                 stc.ipv4_scope = asoc->ipv4_local_scope;
4859                 stc.site_scope = asoc->site_scope;
4860                 stc.local_scope = asoc->local_scope;
4861                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
4862                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
4863                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
4864                                         /*
4865                                          * if we have a LL address, start
4866                                          * counting at 1.
4867                                          */
4868                                         cnt_inits_to = 1;
4869                                 }
4870                         }
4871                 }
4872
4873                 /* use the net pointer */
4874                 to = (struct sockaddr *)&net->ro._l_addr;
4875                 if (to->sa_family == AF_INET) {
4876                         sin = (struct sockaddr_in *)to;
4877                         stc.address[0] = sin->sin_addr.s_addr;
4878                         stc.address[1] = 0;
4879                         stc.address[2] = 0;
4880                         stc.address[3] = 0;
4881                         stc.addr_type = SCTP_IPV4_ADDRESS;
4882                         if (net->src_addr_selected == 0) {
4883                                 /*
4884                                  * strange case here, the INIT should have
4885                                  * did the selection.
4886                                  */
4887                                 net->ro._s_addr = sctp_source_address_selection(inp,
4888                                     stcb, (sctp_route_t *) & net->ro,
4889                                     net, 0, vrf_id);
4890                                 if (net->ro._s_addr == NULL)
4891                                         return;
4892
4893                                 net->src_addr_selected = 1;
4894
4895                         }
4896                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
4897                         stc.laddress[1] = 0;
4898                         stc.laddress[2] = 0;
4899                         stc.laddress[3] = 0;
4900                         stc.laddr_type = SCTP_IPV4_ADDRESS;
4901                 } else if (to->sa_family == AF_INET6) {
4902                         sin6 = (struct sockaddr_in6 *)to;
4903                         memcpy(&stc.address, &sin6->sin6_addr,
4904                             sizeof(struct in6_addr));
4905                         stc.addr_type = SCTP_IPV6_ADDRESS;
4906                         if (net->src_addr_selected == 0) {
4907                                 /*
4908                                  * strange case here, the INIT should have
4909                                  * did the selection.
4910                                  */
4911                                 net->ro._s_addr = sctp_source_address_selection(inp,
4912                                     stcb, (sctp_route_t *) & net->ro,
4913                                     net, 0, vrf_id);
4914                                 if (net->ro._s_addr == NULL)
4915                                         return;
4916
4917                                 net->src_addr_selected = 1;
4918                         }
4919                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
4920                             sizeof(struct in6_addr));
4921                         stc.laddr_type = SCTP_IPV6_ADDRESS;
4922                 }
4923         }
4924         /* Now lets put the SCTP header in place */
4925         initackm_out = mtod(m, struct sctp_init_msg *);
4926         initackm_out->sh.src_port = inp->sctp_lport;
4927         initackm_out->sh.dest_port = sh->src_port;
4928         initackm_out->sh.v_tag = init_chk->init.initiate_tag;
4929         /* Save it off for quick ref */
4930         stc.peers_vtag = init_chk->init.initiate_tag;
4931         initackm_out->sh.checksum = 0;  /* calculate later */
4932         /* who are we */
4933         memcpy(stc.identification, SCTP_VERSION_STRING,
4934             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
4935         /* now the chunk header */
4936         initackm_out->msg.ch.chunk_type = SCTP_INITIATION_ACK;
4937         initackm_out->msg.ch.chunk_flags = 0;
4938         /* fill in later from mbuf we build */
4939         initackm_out->msg.ch.chunk_length = 0;
4940         /* place in my tag */
4941         if ((asoc != NULL) &&
4942             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
4943             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
4944             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
4945                 /* re-use the v-tags and init-seq here */
4946                 initackm_out->msg.init.initiate_tag = htonl(asoc->my_vtag);
4947                 initackm_out->msg.init.initial_tsn = htonl(asoc->init_seq_number);
4948         } else {
4949                 uint32_t vtag, itsn;
4950
4951                 if (hold_inp_lock) {
4952                         SCTP_INP_INCR_REF(inp);
4953                         SCTP_INP_RUNLOCK(inp);
4954                 }
4955                 if (asoc) {
4956                         atomic_add_int(&asoc->refcnt, 1);
4957                         SCTP_TCB_UNLOCK(stcb);
4958                         vtag = sctp_select_a_tag(inp, 1);
4959                         initackm_out->msg.init.initiate_tag = htonl(vtag);
4960                         /* get a TSN to use too */
4961                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
4962                         initackm_out->msg.init.initial_tsn = htonl(itsn);
4963                         SCTP_TCB_LOCK(stcb);
4964                         atomic_add_int(&asoc->refcnt, -1);
4965                 } else {
4966                         vtag = sctp_select_a_tag(inp, 1);
4967                         initackm_out->msg.init.initiate_tag = htonl(vtag);
4968                         /* get a TSN to use too */
4969                         initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
4970                 }
4971                 if (hold_inp_lock) {
4972                         SCTP_INP_RLOCK(inp);
4973                         SCTP_INP_DECR_REF(inp);
4974                 }
4975         }
4976         /* save away my tag to */
4977         stc.my_vtag = initackm_out->msg.init.initiate_tag;
4978
4979         /* set up some of the credits. */
4980         so = inp->sctp_socket;
4981         if (so == NULL) {
4982                 /* memory problem */
4983                 sctp_m_freem(m);
4984                 return;
4985         } else {
4986                 initackm_out->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
4987         }
4988         /* set what I want */
4989         his_limit = ntohs(init_chk->init.num_inbound_streams);
4990         /* choose what I want */
4991         if (asoc != NULL) {
4992                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
4993                         i_want = asoc->streamoutcnt;
4994                 } else {
4995                         i_want = inp->sctp_ep.pre_open_stream_count;
4996                 }
4997         } else {
4998                 i_want = inp->sctp_ep.pre_open_stream_count;
4999         }
5000         if (his_limit < i_want) {
5001                 /* I Want more :< */
5002                 initackm_out->msg.init.num_outbound_streams = init_chk->init.num_inbound_streams;
5003         } else {
5004                 /* I can have what I want :> */
5005                 initackm_out->msg.init.num_outbound_streams = htons(i_want);
5006         }
5007         /* tell him his limt. */
5008         initackm_out->msg.init.num_inbound_streams =
5009             htons(inp->sctp_ep.max_open_streams_intome);
5010         /* setup the ECN pointer */
5011
5012         if (inp->sctp_ep.adaptation_layer_indicator) {
5013                 struct sctp_adaptation_layer_indication *ali;
5014
5015                 ali = (struct sctp_adaptation_layer_indication *)(
5016                     (caddr_t)initackm_out + sizeof(*initackm_out));
5017                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5018                 ali->ph.param_length = htons(sizeof(*ali));
5019                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5020                 SCTP_BUF_LEN(m) += sizeof(*ali);
5021                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
5022                     sizeof(*ali));
5023         } else {
5024                 ecn = (struct sctp_ecn_supported_param *)(
5025                     (caddr_t)initackm_out + sizeof(*initackm_out));
5026         }
5027
5028         /* ECN parameter */
5029         if (sctp_ecn_enable == 1) {
5030                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5031                 ecn->ph.param_length = htons(sizeof(*ecn));
5032                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5033
5034                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5035                     sizeof(*ecn));
5036         } else {
5037                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5038         }
5039         /* And now tell the peer we do  pr-sctp */
5040         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5041         prsctp->ph.param_length = htons(sizeof(*prsctp));
5042         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5043
5044         /* And now tell the peer we do all the extensions */
5045         pr_supported = (struct sctp_supported_chunk_types_param *)
5046             ((caddr_t)prsctp + sizeof(*prsctp));
5047
5048         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5049         num_ext = 0;
5050         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5051         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5052         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5053         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5054         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5055         if (!sctp_auth_disable)
5056                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5057         p_len = sizeof(*pr_supported) + num_ext;
5058         pr_supported->ph.param_length = htons(p_len);
5059         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5060         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5061
5062         /* ECN nonce: And now tell the peer we support ECN nonce */
5063         if (sctp_ecn_nonce) {
5064                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5065                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5066                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5067                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5068                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5069         }
5070         /* add authentication parameters */
5071         if (!sctp_auth_disable) {
5072                 struct sctp_auth_random *randp;
5073                 struct sctp_auth_hmac_algo *hmacs;
5074                 struct sctp_auth_chunk_list *chunks;
5075                 uint16_t random_len;
5076
5077                 /* generate and add RANDOM parameter */
5078                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5079                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5080                 randp->ph.param_type = htons(SCTP_RANDOM);
5081                 p_len = sizeof(*randp) + random_len;
5082                 randp->ph.param_length = htons(p_len);
5083                 SCTP_READ_RANDOM(randp->random_data, random_len);
5084                 /* zero out any padding required */
5085                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5086                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5087
5088                 /* add HMAC_ALGO parameter */
5089                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5090                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5091                     (uint8_t *) hmacs->hmac_ids);
5092                 if (p_len > 0) {
5093                         p_len += sizeof(*hmacs);
5094                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5095                         hmacs->ph.param_length = htons(p_len);
5096                         /* zero out any padding required */
5097                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5098                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5099                 }
5100                 /* add CHUNKS parameter */
5101                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5102                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5103                     chunks->chunk_types);
5104                 if (p_len > 0) {
5105                         p_len += sizeof(*chunks);
5106                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5107                         chunks->ph.param_length = htons(p_len);
5108                         /* zero out any padding required */
5109                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5110                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5111                 }
5112         }
5113         m_at = m;
5114         /* now the addresses */
5115         {
5116                 struct sctp_scoping scp;
5117
5118                 /*
5119                  * To optimize this we could put the scoping stuff into a
5120                  * structure and remove the individual uint8's from the stc
5121                  * structure. Then we could just sifa in the address within
5122                  * the stc.. but for now this is a quick hack to get the
5123                  * address stuff teased apart.
5124                  */
5125                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5126                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5127                 scp.loopback_scope = stc.loopback_scope;
5128                 scp.ipv4_local_scope = stc.ipv4_scope;
5129                 scp.local_scope = stc.local_scope;
5130                 scp.site_scope = stc.site_scope;
5131                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5132         }
5133
5134         /* tack on the operational error if present */
5135         if (op_err) {
5136                 struct mbuf *ol;
5137                 int llen;
5138
5139                 llen = 0;
5140                 ol = op_err;
5141                 while (ol) {
5142                         llen += SCTP_BUF_LEN(ol);
5143                         ol = SCTP_BUF_NEXT(ol);
5144                 }
5145                 if (llen % 4) {
5146                         /* must add a pad to the param */
5147                         uint32_t cpthis = 0;
5148                         int padlen;
5149
5150                         padlen = 4 - (llen % 4);
5151                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5152                 }
5153                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5154                         m_at = SCTP_BUF_NEXT(m_at);
5155                 }
5156                 SCTP_BUF_NEXT(m_at) = op_err;
5157                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5158                         m_at = SCTP_BUF_NEXT(m_at);
5159                 }
5160         }
5161         /* pre-calulate the size and update pkt header and chunk header */
5162         p_len = 0;
5163         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5164                 p_len += SCTP_BUF_LEN(m_tmp);
5165                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5166                         /* m_tmp should now point to last one */
5167                         break;
5168                 }
5169         }
5170
5171         /* Now we must build a cookie */
5172         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m,
5173             sizeof(struct sctphdr), &stc, &signature);
5174         if (m_cookie == NULL) {
5175                 /* memory problem */
5176                 sctp_m_freem(m);
5177                 return;
5178         }
5179         /* Now append the cookie to the end and update the space/size */
5180         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5181
5182         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5183                 p_len += SCTP_BUF_LEN(m_tmp);
5184                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5185                         /* m_tmp should now point to last one */
5186                         mp_last = m_tmp;
5187                         break;
5188                 }
5189         }
5190         /*
5191          * Place in the size, but we don't include the last pad (if any) in
5192          * the INIT-ACK.
5193          */
5194         initackm_out->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
5195
5196         /*
5197          * Time to sign the cookie, we don't sign over the cookie signature
5198          * though thus we set trailer.
5199          */
5200         (void)sctp_hmac_m(SCTP_HMAC,
5201             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5202             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5203             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5204         /*
5205          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5206          * here since the timer will drive a retranmission.
5207          */
5208         padval = p_len % 4;
5209         if ((padval) && (mp_last)) {
5210                 /* see my previous comments on mp_last */
5211                 int ret;
5212
5213                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5214                 if (ret) {
5215                         /* Houston we have a problem, no space */
5216                         sctp_m_freem(m);
5217                         return;
5218                 }
5219                 p_len += padval;
5220         }
5221         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5222             NULL, 0, SCTP_SO_NOT_LOCKED);
5223         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5224 }
5225
5226
5227 void
5228 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5229     struct sctp_association *asoc,
5230     struct sctp_stream_out *strq, int holds_lock)
5231 {
5232         struct sctp_stream_out *stre, *strn;
5233
5234         if (holds_lock == 0) {
5235                 SCTP_TCB_SEND_LOCK(stcb);
5236         }
5237         if ((strq->next_spoke.tqe_next) ||
5238             (strq->next_spoke.tqe_prev)) {
5239                 /* already on wheel */
5240                 goto outof_here;
5241         }
5242         stre = TAILQ_FIRST(&asoc->out_wheel);
5243         if (stre == NULL) {
5244                 /* only one on wheel */
5245                 TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
5246                 goto outof_here;
5247         }
5248         for (; stre; stre = strn) {
5249                 strn = TAILQ_NEXT(stre, next_spoke);
5250                 if (stre->stream_no > strq->stream_no) {
5251                         TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
5252                         goto outof_here;
5253                 } else if (stre->stream_no == strq->stream_no) {
5254                         /* huh, should not happen */
5255                         goto outof_here;
5256                 } else if (strn == NULL) {
5257                         /* next one is null */
5258                         TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
5259                             next_spoke);
5260                 }
5261         }
5262 outof_here:
5263         if (holds_lock == 0) {
5264                 SCTP_TCB_SEND_UNLOCK(stcb);
5265         }
5266 }
5267
5268 static void
5269 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5270     struct sctp_association *asoc,
5271     struct sctp_stream_out *strq)
5272 {
5273         /* take off and then setup so we know it is not on the wheel */
5274         SCTP_TCB_SEND_LOCK(stcb);
5275         if (TAILQ_FIRST(&strq->outqueue)) {
5276                 /* more was added */
5277                 SCTP_TCB_SEND_UNLOCK(stcb);
5278                 return;
5279         }
5280         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5281         strq->next_spoke.tqe_next = NULL;
5282         strq->next_spoke.tqe_prev = NULL;
5283         SCTP_TCB_SEND_UNLOCK(stcb);
5284 }
5285
5286 static void
5287 sctp_prune_prsctp(struct sctp_tcb *stcb,
5288     struct sctp_association *asoc,
5289     struct sctp_sndrcvinfo *srcv,
5290     int dataout)
5291 {
5292         int freed_spc = 0;
5293         struct sctp_tmit_chunk *chk, *nchk;
5294
5295         SCTP_TCB_LOCK_ASSERT(stcb);
5296         if ((asoc->peer_supports_prsctp) &&
5297             (asoc->sent_queue_cnt_removeable > 0)) {
5298                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5299                         /*
5300                          * Look for chunks marked with the PR_SCTP flag AND
5301                          * the buffer space flag. If the one being sent is
5302                          * equal or greater priority then purge the old one
5303                          * and free some space.
5304                          */
5305                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5306                                 /*
5307                                  * This one is PR-SCTP AND buffer space
5308                                  * limited type
5309                                  */
5310                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5311                                         /*
5312                                          * Lower numbers equates to higher
5313                                          * priority so if the one we are
5314                                          * looking at has a larger or equal
5315                                          * priority we want to drop the data
5316                                          * and NOT retransmit it.
5317                                          */
5318                                         if (chk->data) {
5319                                                 /*
5320                                                  * We release the book_size
5321                                                  * if the mbuf is here
5322                                                  */
5323                                                 int ret_spc;
5324                                                 int cause;
5325
5326                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5327                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5328                                                 else
5329                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5330                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5331                                                     cause,
5332                                                     &asoc->sent_queue, SCTP_SO_LOCKED);
5333                                                 freed_spc += ret_spc;
5334                                                 if (freed_spc >= dataout) {
5335                                                         return;
5336                                                 }
5337                                         }       /* if chunk was present */
5338                                 }       /* if of sufficent priority */
5339                         }       /* if chunk has enabled */
5340                 }               /* tailqforeach */
5341
5342                 chk = TAILQ_FIRST(&asoc->send_queue);
5343                 while (chk) {
5344                         nchk = TAILQ_NEXT(chk, sctp_next);
5345                         /* Here we must move to the sent queue and mark */
5346                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5347                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5348                                         if (chk->data) {
5349                                                 /*
5350                                                  * We release the book_size
5351                                                  * if the mbuf is here
5352                                                  */
5353                                                 int ret_spc;
5354
5355                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5356                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5357                                                     &asoc->send_queue, SCTP_SO_LOCKED);
5358
5359                                                 freed_spc += ret_spc;
5360                                                 if (freed_spc >= dataout) {
5361                                                         return;
5362                                                 }
5363                                         }       /* end if chk->data */
5364                                 }       /* end if right class */
5365                         }       /* end if chk pr-sctp */
5366                         chk = nchk;
5367                 }               /* end while (chk) */
5368         }                       /* if enabled in asoc */
5369 }
5370
5371 int
5372 sctp_get_frag_point(struct sctp_tcb *stcb,
5373     struct sctp_association *asoc)
5374 {
5375         int siz, ovh;
5376
5377         /*
5378          * For endpoints that have both v6 and v4 addresses we must reserve
5379          * room for the ipv6 header, for those that are only dealing with V4
5380          * we use a larger frag point.
5381          */
5382         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5383                 ovh = SCTP_MED_OVERHEAD;
5384         } else {
5385                 ovh = SCTP_MED_V4_OVERHEAD;
5386         }
5387
5388         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5389                 siz = asoc->smallest_mtu - ovh;
5390         else
5391                 siz = (stcb->asoc.sctp_frag_point - ovh);
5392         /*
5393          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5394          */
5395         /* A data chunk MUST fit in a cluster */
5396         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5397         /* } */
5398
5399         /* adjust for an AUTH chunk if DATA requires auth */
5400         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5401                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5402
5403         if (siz % 4) {
5404                 /* make it an even word boundary please */
5405                 siz -= (siz % 4);
5406         }
5407         return (siz);
5408 }
5409
5410 static void
5411 sctp_set_prsctp_policy(struct sctp_tcb *stcb,
5412     struct sctp_stream_queue_pending *sp)
5413 {
5414         sp->pr_sctp_on = 0;
5415         if (stcb->asoc.peer_supports_prsctp) {
5416                 /*
5417                  * We assume that the user wants PR_SCTP_TTL if the user
5418                  * provides a positive lifetime but does not specify any
5419                  * PR_SCTP policy. This is a BAD assumption and causes
5420                  * problems at least with the U-Vancovers MPI folks. I will
5421                  * change this to be no policy means NO PR-SCTP.
5422                  */
5423                 if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5424                         sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5425                         sp->pr_sctp_on = 1;
5426                 } else {
5427                         return;
5428                 }
5429                 switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5430                 case CHUNK_FLAGS_PR_SCTP_BUF:
5431                         /*
5432                          * Time to live is a priority stored in tv_sec when
5433                          * doing the buffer drop thing.
5434                          */
5435                         sp->ts.tv_sec = sp->timetolive;
5436                         sp->ts.tv_usec = 0;
5437                         break;
5438                 case CHUNK_FLAGS_PR_SCTP_TTL:
5439                         {
5440                                 struct timeval tv;
5441
5442                                 (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5443                                 tv.tv_sec = sp->timetolive / 1000;
5444                                 tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5445                                 timevaladd(&sp->ts, &tv);
5446                         }
5447                         break;
5448                 case CHUNK_FLAGS_PR_SCTP_RTX:
5449                         /*
5450                          * Time to live is a the number or retransmissions
5451                          * stored in tv_sec.
5452                          */
5453                         sp->ts.tv_sec = sp->timetolive;
5454                         sp->ts.tv_usec = 0;
5455                         break;
5456                 default:
5457                         SCTPDBG(SCTP_DEBUG_USRREQ1,
5458                             "Unknown PR_SCTP policy %u.\n",
5459                             PR_SCTP_POLICY(sp->sinfo_flags));
5460                         break;
5461                 }
5462         }
5463 }
5464
5465 static int
5466 sctp_msg_append(struct sctp_tcb *stcb,
5467     struct sctp_nets *net,
5468     struct mbuf *m,
5469     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5470 {
5471         int error = 0, holds_lock;
5472         struct mbuf *at;
5473         struct sctp_stream_queue_pending *sp = NULL;
5474         struct sctp_stream_out *strm;
5475
5476         /*
5477          * Given an mbuf chain, put it into the association send queue and
5478          * place it on the wheel
5479          */
5480         holds_lock = hold_stcb_lock;
5481         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5482                 /* Invalid stream number */
5483                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5484                 error = EINVAL;
5485                 goto out_now;
5486         }
5487         if ((stcb->asoc.stream_locked) &&
5488             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5489                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5490                 error = EINVAL;
5491                 goto out_now;
5492         }
5493         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5494         /* Now can we send this? */
5495         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5496             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5497             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5498             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5499                 /* got data while shutting down */
5500                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5501                 error = ECONNRESET;
5502                 goto out_now;
5503         }
5504         sctp_alloc_a_strmoq(stcb, sp);
5505         if (sp == NULL) {
5506                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5507                 error = ENOMEM;
5508                 goto out_now;
5509         }
5510         sp->sinfo_flags = srcv->sinfo_flags;
5511         sp->timetolive = srcv->sinfo_timetolive;
5512         sp->ppid = srcv->sinfo_ppid;
5513         sp->context = srcv->sinfo_context;
5514         sp->strseq = 0;
5515         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5516                 sp->net = net;
5517                 sp->addr_over = 1;
5518         } else {
5519                 sp->net = stcb->asoc.primary_destination;
5520                 sp->addr_over = 0;
5521         }
5522         atomic_add_int(&sp->net->ref_count, 1);
5523         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5524         sp->stream = srcv->sinfo_stream;
5525         sp->msg_is_complete = 1;
5526         sp->sender_all_done = 1;
5527         sp->some_taken = 0;
5528         sp->data = m;
5529         sp->tail_mbuf = NULL;
5530         sp->length = 0;
5531         at = m;
5532         sctp_set_prsctp_policy(stcb, sp);
5533         /*
5534          * We could in theory (for sendall) sifa the length in, but we would
5535          * still have to hunt through the chain since we need to setup the
5536          * tail_mbuf
5537          */
5538         while (at) {
5539                 if (SCTP_BUF_NEXT(at) == NULL)
5540                         sp->tail_mbuf = at;
5541                 sp->length += SCTP_BUF_LEN(at);
5542                 at = SCTP_BUF_NEXT(at);
5543         }
5544         SCTP_TCB_SEND_LOCK(stcb);
5545         sctp_snd_sb_alloc(stcb, sp->length);
5546         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5547         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5548         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5549                 sp->strseq = strm->next_sequence_sent;
5550                 strm->next_sequence_sent++;
5551         }
5552         if ((strm->next_spoke.tqe_next == NULL) &&
5553             (strm->next_spoke.tqe_prev == NULL)) {
5554                 /* Not on wheel, insert */
5555                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5556         }
5557         m = NULL;
5558         SCTP_TCB_SEND_UNLOCK(stcb);
5559 out_now:
5560         if (m) {
5561                 sctp_m_freem(m);
5562         }
5563         return (error);
5564 }
5565
5566
5567 static struct mbuf *
5568 sctp_copy_mbufchain(struct mbuf *clonechain,
5569     struct mbuf *outchain,
5570     struct mbuf **endofchain,
5571     int can_take_mbuf,
5572     int sizeofcpy,
5573     uint8_t copy_by_ref)
5574 {
5575         struct mbuf *m;
5576         struct mbuf *appendchain;
5577         caddr_t cp;
5578         int len;
5579
5580         if (endofchain == NULL) {
5581                 /* error */
5582 error_out:
5583                 if (outchain)
5584                         sctp_m_freem(outchain);
5585                 return (NULL);
5586         }
5587         if (can_take_mbuf) {
5588                 appendchain = clonechain;
5589         } else {
5590                 if (!copy_by_ref &&
5591                     (sizeofcpy <= (int)((((sctp_mbuf_threshold_count - 1) * MLEN) + MHLEN)))
5592                     ) {
5593                         /* Its not in a cluster */
5594                         if (*endofchain == NULL) {
5595                                 /* lets get a mbuf cluster */
5596                                 if (outchain == NULL) {
5597                                         /* This is the general case */
5598                         new_mbuf:
5599                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5600                                         if (outchain == NULL) {
5601                                                 goto error_out;
5602                                         }
5603                                         SCTP_BUF_LEN(outchain) = 0;
5604                                         *endofchain = outchain;
5605                                         /* get the prepend space */
5606                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5607                                 } else {
5608                                         /*
5609                                          * We really should not get a NULL
5610                                          * in endofchain
5611                                          */
5612                                         /* find end */
5613                                         m = outchain;
5614                                         while (m) {
5615                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5616                                                         *endofchain = m;
5617                                                         break;
5618                                                 }
5619                                                 m = SCTP_BUF_NEXT(m);
5620                                         }
5621                                         /* sanity */
5622                                         if (*endofchain == NULL) {
5623                                                 /*
5624                                                  * huh, TSNH XXX maybe we
5625                                                  * should panic
5626                                                  */
5627                                                 sctp_m_freem(outchain);
5628                                                 goto new_mbuf;
5629                                         }
5630                                 }
5631                                 /* get the new end of length */
5632                                 len = M_TRAILINGSPACE(*endofchain);
5633                         } else {
5634                                 /* how much is left at the end? */
5635                                 len = M_TRAILINGSPACE(*endofchain);
5636                         }
5637                         /* Find the end of the data, for appending */
5638                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5639
5640                         /* Now lets copy it out */
5641                         if (len >= sizeofcpy) {
5642                                 /* It all fits, copy it in */
5643                                 m_copydata(clonechain, 0, sizeofcpy, cp);
5644                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5645                         } else {
5646                                 /* fill up the end of the chain */
5647                                 if (len > 0) {
5648                                         m_copydata(clonechain, 0, len, cp);
5649                                         SCTP_BUF_LEN((*endofchain)) += len;
5650                                         /* now we need another one */
5651                                         sizeofcpy -= len;
5652                                 }
5653                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5654                                 if (m == NULL) {
5655                                         /* We failed */
5656                                         goto error_out;
5657                                 }
5658                                 SCTP_BUF_NEXT((*endofchain)) = m;
5659                                 *endofchain = m;
5660                                 cp = mtod((*endofchain), caddr_t);
5661                                 m_copydata(clonechain, len, sizeofcpy, cp);
5662                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5663                         }
5664                         return (outchain);
5665                 } else {
5666                         /* copy the old fashion way */
5667                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
5668                 }
5669         }
5670         if (appendchain == NULL) {
5671                 /* error */
5672                 if (outchain)
5673                         sctp_m_freem(outchain);
5674                 return (NULL);
5675         }
5676         if (outchain) {
5677                 /* tack on to the end */
5678                 if (*endofchain != NULL) {
5679                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
5680                 } else {
5681                         m = outchain;
5682                         while (m) {
5683                                 if (SCTP_BUF_NEXT(m) == NULL) {
5684                                         SCTP_BUF_NEXT(m) = appendchain;
5685                                         break;
5686                                 }
5687                                 m = SCTP_BUF_NEXT(m);
5688                         }
5689                 }
5690                 /*
5691                  * save off the end and update the end-chain postion
5692                  */
5693                 m = appendchain;
5694                 while (m) {
5695                         if (SCTP_BUF_NEXT(m) == NULL) {
5696                                 *endofchain = m;
5697                                 break;
5698                         }
5699                         m = SCTP_BUF_NEXT(m);
5700                 }
5701                 return (outchain);
5702         } else {
5703                 /* save off the end and update the end-chain postion */
5704                 m = appendchain;
5705                 while (m) {
5706                         if (SCTP_BUF_NEXT(m) == NULL) {
5707                                 *endofchain = m;
5708                                 break;
5709                         }
5710                         m = SCTP_BUF_NEXT(m);
5711                 }
5712                 return (appendchain);
5713         }
5714 }
5715
5716 int
5717 sctp_med_chunk_output(struct sctp_inpcb *inp,
5718     struct sctp_tcb *stcb,
5719     struct sctp_association *asoc,
5720     int *num_out,
5721     int *reason_code,
5722     int control_only, int *cwnd_full, int from_where,
5723     struct timeval *now, int *now_filled, int frag_point, int so_locked
5724 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
5725     SCTP_UNUSED
5726 #endif
5727 );
5728
5729 static void
5730 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
5731     uint32_t val)
5732 {
5733         struct sctp_copy_all *ca;
5734         struct mbuf *m;
5735         int ret = 0;
5736         int added_control = 0;
5737         int un_sent, do_chunk_output = 1;
5738         struct sctp_association *asoc;
5739
5740         ca = (struct sctp_copy_all *)ptr;
5741         if (ca->m == NULL) {
5742                 return;
5743         }
5744         if (ca->inp != inp) {
5745                 /* TSNH */
5746                 return;
5747         }
5748         if ((ca->m) && ca->sndlen) {
5749                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
5750                 if (m == NULL) {
5751                         /* can't copy so we are done */
5752                         ca->cnt_failed++;
5753                         return;
5754                 }
5755         } else {
5756                 m = NULL;
5757         }
5758         SCTP_TCB_LOCK_ASSERT(stcb);
5759         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
5760                 /* Abort this assoc with m as the user defined reason */
5761                 if (m) {
5762                         struct sctp_paramhdr *ph;
5763
5764                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
5765                         if (m) {
5766                                 ph = mtod(m, struct sctp_paramhdr *);
5767                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
5768                                 ph->param_length = htons(ca->sndlen);
5769                         }
5770                         /*
5771                          * We add one here to keep the assoc from
5772                          * dis-appearing on us.
5773                          */
5774                         atomic_add_int(&stcb->asoc.refcnt, 1);
5775                         sctp_abort_an_association(inp, stcb,
5776                             SCTP_RESPONSE_TO_USER_REQ,
5777                             m, SCTP_SO_NOT_LOCKED);
5778                         /*
5779                          * sctp_abort_an_association calls sctp_free_asoc()
5780                          * free association will NOT free it since we
5781                          * incremented the refcnt .. we do this to prevent
5782                          * it being freed and things getting tricky since we
5783                          * could end up (from free_asoc) calling inpcb_free
5784                          * which would get a recursive lock call to the
5785                          * iterator lock.. But as a consequence of that the
5786                          * stcb will return to us un-locked.. since
5787                          * free_asoc returns with either no TCB or the TCB
5788                          * unlocked, we must relock.. to unlock in the
5789                          * iterator timer :-0
5790                          */
5791                         SCTP_TCB_LOCK(stcb);
5792                         atomic_add_int(&stcb->asoc.refcnt, -1);
5793                         goto no_chunk_output;
5794                 }
5795         } else {
5796                 if (m) {
5797                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
5798                             &ca->sndrcv, 1);
5799                 }
5800                 asoc = &stcb->asoc;
5801                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
5802                         /* shutdown this assoc */
5803                         int cnt;
5804
5805                         cnt = sctp_is_there_unsent_data(stcb);
5806
5807                         if (TAILQ_EMPTY(&asoc->send_queue) &&
5808                             TAILQ_EMPTY(&asoc->sent_queue) &&
5809                             (cnt == 0)) {
5810                                 if (asoc->locked_on_sending) {
5811                                         goto abort_anyway;
5812                                 }
5813                                 /*
5814                                  * there is nothing queued to send, so I'm
5815                                  * done...
5816                                  */
5817                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
5818                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
5819                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
5820                                         /*
5821                                          * only send SHUTDOWN the first time
5822                                          * through
5823                                          */
5824                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
5825                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
5826                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
5827                                         }
5828                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
5829                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
5830                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
5831                                             asoc->primary_destination);
5832                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
5833                                             asoc->primary_destination);
5834                                         added_control = 1;
5835                                         do_chunk_output = 0;
5836                                 }
5837                         } else {
5838                                 /*
5839                                  * we still got (or just got) data to send,
5840                                  * so set SHUTDOWN_PENDING
5841                                  */
5842                                 /*
5843                                  * XXX sockets draft says that SCTP_EOF
5844                                  * should be sent with no data.  currently,
5845                                  * we will allow user data to be sent first
5846                                  * and move to SHUTDOWN-PENDING
5847                                  */
5848                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
5849                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
5850                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
5851                                         if (asoc->locked_on_sending) {
5852                                                 /*
5853                                                  * Locked to send out the
5854                                                  * data
5855                                                  */
5856                                                 struct sctp_stream_queue_pending *sp;
5857
5858                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
5859                                                 if (sp) {
5860                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
5861                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
5862                                                 }
5863                                         }
5864                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
5865                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
5866                                             TAILQ_EMPTY(&asoc->sent_queue) &&
5867                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
5868                                 abort_anyway:
5869                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5870                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
5871                                                     SCTP_RESPONSE_TO_USER_REQ,
5872                                                     NULL, SCTP_SO_NOT_LOCKED);
5873                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
5874                                                 goto no_chunk_output;
5875                                         }
5876                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
5877                                             asoc->primary_destination);
5878                                 }
5879                         }
5880
5881                 }
5882         }
5883         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
5884             ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
5885
5886         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
5887             (stcb->asoc.total_flight > 0) &&
5888             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
5889             ) {
5890                 do_chunk_output = 0;
5891         }
5892         if (do_chunk_output)
5893                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
5894         else if (added_control) {
5895                 int num_out = 0, reason = 0, cwnd_full = 0, now_filled = 0;
5896                 struct timeval now;
5897                 int frag_point;
5898
5899                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
5900                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
5901                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
5902         }
5903 no_chunk_output:
5904         if (ret) {
5905                 ca->cnt_failed++;
5906         } else {
5907                 ca->cnt_sent++;
5908         }
5909 }
5910
5911 static void
5912 sctp_sendall_completes(void *ptr, uint32_t val)
5913 {
5914         struct sctp_copy_all *ca;
5915
5916         ca = (struct sctp_copy_all *)ptr;
5917         /*
5918          * Do a notify here? Kacheong suggests that the notify be done at
5919          * the send time.. so you would push up a notification if any send
5920          * failed. Don't know if this is feasable since the only failures we
5921          * have is "memory" related and if you cannot get an mbuf to send
5922          * the data you surely can't get an mbuf to send up to notify the
5923          * user you can't send the data :->
5924          */
5925
5926         /* now free everything */
5927         sctp_m_freem(ca->m);
5928         SCTP_FREE(ca, SCTP_M_COPYAL);
5929 }
5930
5931
5932 #define MC_ALIGN(m, len) do {                                           \
5933         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
5934 } while (0)
5935
5936
5937
5938 static struct mbuf *
5939 sctp_copy_out_all(struct uio *uio, int len)
5940 {
5941         struct mbuf *ret, *at;
5942         int left, willcpy, cancpy, error;
5943
5944         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
5945         if (ret == NULL) {
5946                 /* TSNH */
5947                 return (NULL);
5948         }
5949         left = len;
5950         SCTP_BUF_LEN(ret) = 0;
5951         /* save space for the data chunk header */
5952         cancpy = M_TRAILINGSPACE(ret);
5953         willcpy = min(cancpy, left);
5954         at = ret;
5955         while (left > 0) {
5956                 /* Align data to the end */
5957                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
5958                 if (error) {
5959         err_out_now:
5960                         sctp_m_freem(at);
5961                         return (NULL);
5962                 }
5963                 SCTP_BUF_LEN(at) = willcpy;
5964                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
5965                 left -= willcpy;
5966                 if (left > 0) {
5967                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
5968                         if (SCTP_BUF_NEXT(at) == NULL) {
5969                                 goto err_out_now;
5970                         }
5971                         at = SCTP_BUF_NEXT(at);
5972                         SCTP_BUF_LEN(at) = 0;
5973                         cancpy = M_TRAILINGSPACE(at);
5974                         willcpy = min(cancpy, left);
5975                 }
5976         }
5977         return (ret);
5978 }
5979
5980 static int
5981 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
5982     struct sctp_sndrcvinfo *srcv)
5983 {
5984         int ret;
5985         struct sctp_copy_all *ca;
5986
5987         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
5988             SCTP_M_COPYAL);
5989         if (ca == NULL) {
5990                 sctp_m_freem(m);
5991                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5992                 return (ENOMEM);
5993         }
5994         memset(ca, 0, sizeof(struct sctp_copy_all));
5995
5996         ca->inp = inp;
5997         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
5998         /*
5999          * take off the sendall flag, it would be bad if we failed to do
6000          * this :-0
6001          */
6002         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6003         /* get length and mbuf chain */
6004         if (uio) {
6005                 ca->sndlen = uio->uio_resid;
6006                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6007                 if (ca->m == NULL) {
6008                         SCTP_FREE(ca, SCTP_M_COPYAL);
6009                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6010                         return (ENOMEM);
6011                 }
6012         } else {
6013                 /* Gather the length of the send */
6014                 struct mbuf *mat;
6015
6016                 mat = m;
6017                 ca->sndlen = 0;
6018                 while (m) {
6019                         ca->sndlen += SCTP_BUF_LEN(m);
6020                         m = SCTP_BUF_NEXT(m);
6021                 }
6022                 ca->m = mat;
6023         }
6024         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6025             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6026             SCTP_ASOC_ANY_STATE,
6027             (void *)ca, 0,
6028             sctp_sendall_completes, inp, 1);
6029         if (ret) {
6030                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6031                 SCTP_FREE(ca, SCTP_M_COPYAL);
6032                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6033                 return (EFAULT);
6034         }
6035         return (0);
6036 }
6037
6038
6039 void
6040 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6041 {
6042         struct sctp_tmit_chunk *chk, *nchk;
6043
6044         chk = TAILQ_FIRST(&asoc->control_send_queue);
6045         while (chk) {
6046                 nchk = TAILQ_NEXT(chk, sctp_next);
6047                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6048                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6049                         if (chk->data) {
6050                                 sctp_m_freem(chk->data);
6051                                 chk->data = NULL;
6052                         }
6053                         asoc->ctrl_queue_cnt--;
6054                         sctp_free_a_chunk(stcb, chk);
6055                 }
6056                 chk = nchk;
6057         }
6058 }
6059
6060 void
6061 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6062 {
6063         struct sctp_association *asoc;
6064         struct sctp_tmit_chunk *chk, *chk_tmp;
6065
6066         asoc = &stcb->asoc;
6067         for (chk = TAILQ_FIRST(&asoc->control_send_queue); chk != NULL;
6068             chk = chk_tmp) {
6069                 /* get next chk */
6070                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6071                 /* find SCTP_ASCONF chunk in queue (only one ever in queue) */
6072                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6073                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6074                         if (chk->data) {
6075                                 sctp_m_freem(chk->data);
6076                                 chk->data = NULL;
6077                         }
6078                         asoc->ctrl_queue_cnt--;
6079                         sctp_free_a_chunk(stcb, chk);
6080                 }
6081         }
6082 }
6083
6084
6085 static void
6086 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6087
6088     struct sctp_association *asoc,
6089     struct sctp_tmit_chunk **data_list,
6090     int bundle_at,
6091     struct sctp_nets *net)
6092 {
6093         int i;
6094         struct sctp_tmit_chunk *tp1;
6095
6096         for (i = 0; i < bundle_at; i++) {
6097                 /* off of the send queue */
6098                 if (i) {
6099                         /*
6100                          * Any chunk NOT 0 you zap the time chunk 0 gets
6101                          * zapped or set based on if a RTO measurment is
6102                          * needed.
6103                          */
6104                         data_list[i]->do_rtt = 0;
6105                 }
6106                 /* record time */
6107                 data_list[i]->sent_rcv_time = net->last_sent_time;
6108                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6109                 TAILQ_REMOVE(&asoc->send_queue,
6110                     data_list[i],
6111                     sctp_next);
6112                 /* on to the sent queue */
6113                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6114                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6115                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6116                         struct sctp_tmit_chunk *tpp;
6117
6118                         /* need to move back */
6119         back_up_more:
6120                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6121                         if (tpp == NULL) {
6122                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6123                                 goto all_done;
6124                         }
6125                         tp1 = tpp;
6126                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6127                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6128                                 goto back_up_more;
6129                         }
6130                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6131                 } else {
6132                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6133                             data_list[i],
6134                             sctp_next);
6135                 }
6136 all_done:
6137                 /* This does not lower until the cum-ack passes it */
6138                 asoc->sent_queue_cnt++;
6139                 asoc->send_queue_cnt--;
6140                 if ((asoc->peers_rwnd <= 0) &&
6141                     (asoc->total_flight == 0) &&
6142                     (bundle_at == 1)) {
6143                         /* Mark the chunk as being a window probe */
6144                         SCTP_STAT_INCR(sctps_windowprobed);
6145                 }
6146 #ifdef SCTP_AUDITING_ENABLED
6147                 sctp_audit_log(0xC2, 3);
6148 #endif
6149                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6150                 data_list[i]->snd_count = 1;
6151                 data_list[i]->rec.data.chunk_was_revoked = 0;
6152                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
6153                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6154                             data_list[i]->whoTo->flight_size,
6155                             data_list[i]->book_size,
6156                             (uintptr_t) data_list[i]->whoTo,
6157                             data_list[i]->rec.data.TSN_seq);
6158                 }
6159                 sctp_flight_size_increase(data_list[i]);
6160                 sctp_total_flight_increase(stcb, data_list[i]);
6161                 if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
6162                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6163                             asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
6164                 }
6165                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6166                     (uint32_t) (data_list[i]->send_size + sctp_peer_chunk_oh));
6167                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6168                         /* SWS sender side engages */
6169                         asoc->peers_rwnd = 0;
6170                 }
6171         }
6172 }
6173
6174 static void
6175 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6176 {
6177         struct sctp_tmit_chunk *chk, *nchk;
6178
6179         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6180             chk; chk = nchk) {
6181                 nchk = TAILQ_NEXT(chk, sctp_next);
6182                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6183                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6184                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6185                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6186                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6187                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6188                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6189                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6190                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6191                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6192                         /* Stray chunks must be cleaned up */
6193         clean_up_anyway:
6194                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6195                         if (chk->data) {
6196                                 sctp_m_freem(chk->data);
6197                                 chk->data = NULL;
6198                         }
6199                         asoc->ctrl_queue_cnt--;
6200                         sctp_free_a_chunk(stcb, chk);
6201                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6202                         /* special handling, we must look into the param */
6203                         if (chk != asoc->str_reset) {
6204                                 goto clean_up_anyway;
6205                         }
6206                 }
6207         }
6208 }
6209
6210
6211 static int
6212 sctp_can_we_split_this(struct sctp_tcb *stcb,
6213     struct sctp_stream_queue_pending *sp,
6214     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6215 {
6216         /*
6217          * Make a decision on if I should split a msg into multiple parts.
6218          * This is only asked of incomplete messages.
6219          */
6220         if (eeor_on) {
6221                 /*
6222                  * If we are doing EEOR we need to always send it if its the
6223                  * entire thing, since it might be all the guy is putting in
6224                  * the hopper.
6225                  */
6226                 if (goal_mtu >= sp->length) {
6227                         /*-
6228                          * If we have data outstanding,
6229                          * we get another chance when the sack
6230                          * arrives to transmit - wait for more data
6231                          */
6232                         if (stcb->asoc.total_flight == 0) {
6233                                 /*
6234                                  * If nothing is in flight, we zero the
6235                                  * packet counter.
6236                                  */
6237                                 return (sp->length);
6238                         }
6239                         return (0);
6240
6241                 } else {
6242                         /* You can fill the rest */
6243                         return (goal_mtu);
6244                 }
6245         }
6246         /*-
6247          * For those strange folk that make the send buffer
6248          * smaller than our fragmentation point, we can't
6249          * get a full msg in so we have to allow splitting.
6250          */
6251         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6252                 return (sp->length);
6253         }
6254         if ((sp->length <= goal_mtu) ||
6255             ((sp->length - goal_mtu) < sctp_min_residual)) {
6256                 /* Sub-optimial residual don't split in non-eeor mode. */
6257                 return (0);
6258         }
6259         /*
6260          * If we reach here sp->length is larger than the goal_mtu. Do we
6261          * wish to split it for the sake of packet putting together?
6262          */
6263         if (goal_mtu >= min(sctp_min_split_point, frag_point)) {
6264                 /* Its ok to split it */
6265                 return (min(goal_mtu, frag_point));
6266         }
6267         /* Nope, can't split */
6268         return (0);
6269
6270 }
6271
6272 static uint32_t
6273 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6274     struct sctp_stream_out *strq,
6275     uint32_t goal_mtu,
6276     uint32_t frag_point,
6277     int *locked,
6278     int *giveup,
6279     int eeor_mode,
6280     int *bail)
6281 {
6282         /* Move from the stream to the send_queue keeping track of the total */
6283         struct sctp_association *asoc;
6284         struct sctp_stream_queue_pending *sp;
6285         struct sctp_tmit_chunk *chk;
6286         struct sctp_data_chunk *dchkh;
6287         uint32_t to_move;
6288         uint8_t rcv_flags = 0;
6289         uint8_t some_taken;
6290         uint8_t send_lock_up = 0;
6291
6292         SCTP_TCB_LOCK_ASSERT(stcb);
6293         asoc = &stcb->asoc;
6294 one_more_time:
6295         /* sa_ignore FREED_MEMORY */
6296         sp = TAILQ_FIRST(&strq->outqueue);
6297         if (sp == NULL) {
6298                 *locked = 0;
6299                 SCTP_TCB_SEND_LOCK(stcb);
6300                 sp = TAILQ_FIRST(&strq->outqueue);
6301                 if (sp) {
6302                         SCTP_TCB_SEND_UNLOCK(stcb);
6303                         goto one_more_time;
6304                 }
6305                 if (strq->last_msg_incomplete) {
6306                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6307                             strq->stream_no,
6308                             strq->last_msg_incomplete);
6309                         strq->last_msg_incomplete = 0;
6310                 }
6311                 SCTP_TCB_SEND_UNLOCK(stcb);
6312                 return (0);
6313         }
6314         if (sp->msg_is_complete) {
6315                 if (sp->length == 0) {
6316                         if (sp->sender_all_done) {
6317                                 /*
6318                                  * We are doing differed cleanup. Last time
6319                                  * through when we took all the data the
6320                                  * sender_all_done was not set.
6321                                  */
6322                                 if (sp->put_last_out == 0) {
6323                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6324                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6325                                             sp->sender_all_done,
6326                                             sp->length,
6327                                             sp->msg_is_complete,
6328                                             sp->put_last_out,
6329                                             send_lock_up);
6330                                 }
6331                                 if (TAILQ_NEXT(sp, next) == NULL) {
6332                                         SCTP_TCB_SEND_LOCK(stcb);
6333                                         send_lock_up = 1;
6334                                 }
6335                                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6336                                 TAILQ_REMOVE(&strq->outqueue, sp, next);
6337                                 sctp_free_remote_addr(sp->net);
6338                                 if (sp->data) {
6339                                         sctp_m_freem(sp->data);
6340                                         sp->data = NULL;
6341                                 }
6342                                 sctp_free_a_strmoq(stcb, sp);
6343
6344                                 /* we can't be locked to it */
6345                                 *locked = 0;
6346                                 stcb->asoc.locked_on_sending = NULL;
6347                                 if (send_lock_up) {
6348                                         SCTP_TCB_SEND_UNLOCK(stcb);
6349                                         send_lock_up = 0;
6350                                 }
6351                                 /* back to get the next msg */
6352                                 goto one_more_time;
6353                         } else {
6354                                 /*
6355                                  * sender just finished this but still holds
6356                                  * a reference
6357                                  */
6358                                 *locked = 1;
6359                                 *giveup = 1;
6360                                 return (0);
6361                         }
6362                 }
6363         } else {
6364                 /* is there some to get */
6365                 if (sp->length == 0) {
6366                         /* no */
6367                         *locked = 1;
6368                         *giveup = 1;
6369                         return (0);
6370                 }
6371         }
6372         some_taken = sp->some_taken;
6373         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6374                 sp->msg_is_complete = 1;
6375         }
6376 re_look:
6377         if (sp->msg_is_complete) {
6378                 /* The message is complete */
6379                 to_move = min(sp->length, frag_point);
6380                 if (to_move == sp->length) {
6381                         /* All of it fits in the MTU */
6382                         if (sp->some_taken) {
6383                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6384                                 sp->put_last_out = 1;
6385                         } else {
6386                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6387                                 sp->put_last_out = 1;
6388                         }
6389                 } else {
6390                         /* Not all of it fits, we fragment */
6391                         if (sp->some_taken == 0) {
6392                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6393                         }
6394                         sp->some_taken = 1;
6395                 }
6396         } else {
6397                 to_move = sctp_can_we_split_this(stcb, sp, goal_mtu,
6398                     frag_point, eeor_mode);
6399                 if (to_move) {
6400                         /*-
6401                          * We use a snapshot of length in case it
6402                          * is expanding during the compare.
6403                          */
6404                         uint32_t llen;
6405
6406                         llen = sp->length;
6407                         if (to_move >= llen) {
6408                                 to_move = llen;
6409                                 if (send_lock_up == 0) {
6410                                         /*-
6411                                          * We are taking all of an incomplete msg
6412                                          * thus we need a send lock.
6413                                          */
6414                                         SCTP_TCB_SEND_LOCK(stcb);
6415                                         send_lock_up = 1;
6416                                         if (sp->msg_is_complete) {
6417                                                 /*
6418                                                  * the sender finished the
6419                                                  * msg
6420                                                  */
6421                                                 goto re_look;
6422                                         }
6423                                 }
6424                         }
6425                         if (sp->some_taken == 0) {
6426                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6427                                 sp->some_taken = 1;
6428                         }
6429                 } else {
6430                         /* Nothing to take. */
6431                         if (sp->some_taken) {
6432                                 *locked = 1;
6433                         }
6434                         *giveup = 1;
6435                         return (0);
6436                 }
6437         }
6438
6439         /* If we reach here, we can copy out a chunk */
6440         sctp_alloc_a_chunk(stcb, chk);
6441         if (chk == NULL) {
6442                 /* No chunk memory */
6443 out_gu:
6444                 if (send_lock_up) {
6445                         /* sa_ignore NO_NULL_CHK */
6446                         SCTP_TCB_SEND_UNLOCK(stcb);
6447                         send_lock_up = 0;
6448                 }
6449                 *giveup = 1;
6450                 return (0);
6451         }
6452         /*
6453          * Setup for unordered if needed by looking at the user sent info
6454          * flags.
6455          */
6456         if (sp->sinfo_flags & SCTP_UNORDERED) {
6457                 rcv_flags |= SCTP_DATA_UNORDERED;
6458         }
6459         /* clear out the chunk before setting up */
6460         memset(chk, 0, sizeof(*chk));
6461         chk->rec.data.rcv_flags = rcv_flags;
6462         if (SCTP_BUF_IS_EXTENDED(sp->data)) {
6463                 chk->copy_by_ref = 1;
6464         } else {
6465                 chk->copy_by_ref = 0;
6466         }
6467         if (to_move >= sp->length) {
6468                 /* we can steal the whole thing */
6469                 chk->data = sp->data;
6470                 chk->last_mbuf = sp->tail_mbuf;
6471                 /* register the stealing */
6472                 sp->data = sp->tail_mbuf = NULL;
6473         } else {
6474                 struct mbuf *m;
6475
6476                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6477                 chk->last_mbuf = NULL;
6478                 if (chk->data == NULL) {
6479                         sp->some_taken = some_taken;
6480                         sctp_free_a_chunk(stcb, chk);
6481                         *bail = 1;
6482                         goto out_gu;
6483                 }
6484                 /* Pull off the data */
6485                 m_adj(sp->data, to_move);
6486                 /* Now lets work our way down and compact it */
6487                 m = sp->data;
6488                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6489                         sp->data = SCTP_BUF_NEXT(m);
6490                         SCTP_BUF_NEXT(m) = NULL;
6491                         if (sp->tail_mbuf == m) {
6492                                 /*-
6493                                  * Freeing tail? TSNH since
6494                                  * we supposedly were taking less
6495                                  * than the sp->length.
6496                                  */
6497 #ifdef INVARIANTS
6498                                 panic("Huh, freing tail? - TSNH");
6499 #else
6500                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6501                                 sp->tail_mbuf = sp->data = NULL;
6502                                 sp->length = 0;
6503 #endif
6504
6505                         }
6506                         sctp_m_free(m);
6507                         m = sp->data;
6508                 }
6509         }
6510         if (to_move > sp->length) {
6511                 /*- This should not happen either
6512                  * since we always lower to_move to the size
6513                  * of sp->length if its larger.
6514                  */
6515 #ifdef INVARIANTS
6516                 panic("Huh, how can to_move be larger?");
6517 #else
6518                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6519                 sp->length = 0;
6520 #endif
6521         } else {
6522                 atomic_subtract_int(&sp->length, to_move);
6523         }
6524         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6525                 /* Not enough room for a chunk header, get some */
6526                 struct mbuf *m;
6527
6528                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6529                 if (m == NULL) {
6530                         /*
6531                          * we're in trouble here. _PREPEND below will free
6532                          * all the data if there is no leading space, so we
6533                          * must put the data back and restore.
6534                          */
6535                         if (send_lock_up == 0) {
6536                                 SCTP_TCB_SEND_LOCK(stcb);
6537                                 send_lock_up = 1;
6538                         }
6539                         if (chk->data == NULL) {
6540                                 /* unsteal the data */
6541                                 sp->data = chk->data;
6542                                 sp->tail_mbuf = chk->last_mbuf;
6543                         } else {
6544                                 struct mbuf *m_tmp;
6545
6546                                 /* reassemble the data */
6547                                 m_tmp = sp->data;
6548                                 sp->data = chk->data;
6549                                 SCTP_BUF_NEXT(sp->data) = m_tmp;
6550                         }
6551                         sp->some_taken = some_taken;
6552                         atomic_add_int(&sp->length, to_move);
6553                         chk->data = NULL;
6554                         *bail = 1;
6555                         sctp_free_a_chunk(stcb, chk);
6556                         goto out_gu;
6557                 } else {
6558                         SCTP_BUF_LEN(m) = 0;
6559                         SCTP_BUF_NEXT(m) = chk->data;
6560                         chk->data = m;
6561                         M_ALIGN(chk->data, 4);
6562                 }
6563         }
6564         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
6565         if (chk->data == NULL) {
6566                 /* HELP, TSNH since we assured it would not above? */
6567 #ifdef INVARIANTS
6568                 panic("prepend failes HELP?");
6569 #else
6570                 SCTP_PRINTF("prepend fails HELP?\n");
6571                 sctp_free_a_chunk(stcb, chk);
6572 #endif
6573                 *bail = 1;
6574                 goto out_gu;
6575         }
6576         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
6577         chk->book_size = chk->send_size = (to_move +
6578             sizeof(struct sctp_data_chunk));
6579         chk->book_size_scale = 0;
6580         chk->sent = SCTP_DATAGRAM_UNSENT;
6581
6582         /*
6583          * get last_mbuf and counts of mb useage This is ugly but hopefully
6584          * its only one mbuf.
6585          */
6586         if (chk->last_mbuf == NULL) {
6587                 chk->last_mbuf = chk->data;
6588                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6589                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6590                 }
6591         }
6592         chk->flags = 0;
6593         chk->asoc = &stcb->asoc;
6594         chk->pad_inplace = 0;
6595         chk->no_fr_allowed = 0;
6596         chk->rec.data.stream_seq = sp->strseq;
6597         chk->rec.data.stream_number = sp->stream;
6598         chk->rec.data.payloadtype = sp->ppid;
6599         chk->rec.data.context = sp->context;
6600         chk->rec.data.doing_fast_retransmit = 0;
6601         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
6602
6603         chk->rec.data.timetodrop = sp->ts;
6604         chk->flags = sp->act_flags;
6605         chk->addr_over = sp->addr_over;
6606
6607         chk->whoTo = net;
6608         atomic_add_int(&chk->whoTo->ref_count, 1);
6609
6610         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
6611         if (sctp_logging_level & SCTP_LOG_AT_SEND_2_OUTQ) {
6612                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
6613                     (uintptr_t) stcb, sp->length,
6614                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
6615                     chk->rec.data.TSN_seq);
6616         }
6617         dchkh = mtod(chk->data, struct sctp_data_chunk *);
6618         /*
6619          * Put the rest of the things in place now. Size was done earlier in
6620          * previous loop prior to padding.
6621          */
6622
6623 #ifdef SCTP_ASOCLOG_OF_TSNS
6624         SCTP_TCB_LOCK_ASSERT(stcb);
6625         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
6626                 asoc->tsn_out_at = 0;
6627                 asoc->tsn_out_wrapped = 1;
6628         }
6629         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
6630         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
6631         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
6632         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
6633         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
6634         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
6635         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
6636         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
6637         asoc->tsn_out_at++;
6638 #endif
6639
6640         dchkh->ch.chunk_type = SCTP_DATA;
6641         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
6642         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
6643         dchkh->dp.stream_id = htons(strq->stream_no);
6644         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
6645         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
6646         dchkh->ch.chunk_length = htons(chk->send_size);
6647         /* Now advance the chk->send_size by the actual pad needed. */
6648         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
6649                 /* need a pad */
6650                 struct mbuf *lm;
6651                 int pads;
6652
6653                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
6654                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
6655                         chk->pad_inplace = 1;
6656                 }
6657                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
6658                         /* pad added an mbuf */
6659                         chk->last_mbuf = lm;
6660                 }
6661                 chk->send_size += pads;
6662         }
6663         /* We only re-set the policy if it is on */
6664         if (sp->pr_sctp_on) {
6665                 sctp_set_prsctp_policy(stcb, sp);
6666                 asoc->pr_sctp_cnt++;
6667                 chk->pr_sctp_on = 1;
6668         } else {
6669                 chk->pr_sctp_on = 0;
6670         }
6671         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
6672                 /* All done pull and kill the message */
6673                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6674                 if (sp->put_last_out == 0) {
6675                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
6676                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6677                             sp->sender_all_done,
6678                             sp->length,
6679                             sp->msg_is_complete,
6680                             sp->put_last_out,
6681                             send_lock_up);
6682                 }
6683                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
6684                         SCTP_TCB_SEND_LOCK(stcb);
6685                         send_lock_up = 1;
6686                 }
6687                 TAILQ_REMOVE(&strq->outqueue, sp, next);
6688                 sctp_free_remote_addr(sp->net);
6689                 if (sp->data) {
6690                         sctp_m_freem(sp->data);
6691                         sp->data = NULL;
6692                 }
6693                 sctp_free_a_strmoq(stcb, sp);
6694
6695                 /* we can't be locked to it */
6696                 *locked = 0;
6697                 stcb->asoc.locked_on_sending = NULL;
6698         } else {
6699                 /* more to go, we are locked */
6700                 *locked = 1;
6701         }
6702         asoc->chunks_on_out_queue++;
6703         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
6704         asoc->send_queue_cnt++;
6705         if (send_lock_up) {
6706                 SCTP_TCB_SEND_UNLOCK(stcb);
6707                 send_lock_up = 0;
6708         }
6709         return (to_move);
6710 }
6711
6712
6713 static struct sctp_stream_out *
6714 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
6715 {
6716         struct sctp_stream_out *strq;
6717
6718         /* Find the next stream to use */
6719         if (asoc->last_out_stream == NULL) {
6720                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
6721                 if (asoc->last_out_stream == NULL) {
6722                         /* huh nothing on the wheel, TSNH */
6723                         return (NULL);
6724                 }
6725                 goto done_it;
6726         }
6727         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
6728 done_it:
6729         if (strq == NULL) {
6730                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
6731         }
6732         /* Save off the last stream */
6733         asoc->last_out_stream = strq;
6734         return (strq);
6735
6736 }
6737
6738 static void
6739 sctp_fill_outqueue(struct sctp_tcb *stcb,
6740     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
6741 {
6742         struct sctp_association *asoc;
6743         struct sctp_stream_out *strq, *strqn, *strqt;
6744         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
6745         int locked, giveup;
6746         struct sctp_stream_queue_pending *sp;
6747
6748         SCTP_TCB_LOCK_ASSERT(stcb);
6749         asoc = &stcb->asoc;
6750 #ifdef INET6
6751         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
6752                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
6753         } else {
6754                 /* ?? not sure what else to do */
6755                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
6756         }
6757 #else
6758         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
6759         mtu_fromwheel = 0;
6760 #endif
6761         /* Need an allowance for the data chunk header too */
6762         goal_mtu -= sizeof(struct sctp_data_chunk);
6763
6764         /* must make even word boundary */
6765         goal_mtu &= 0xfffffffc;
6766         if (asoc->locked_on_sending) {
6767                 /* We are stuck on one stream until the message completes. */
6768                 strqn = strq = asoc->locked_on_sending;
6769                 locked = 1;
6770         } else {
6771                 strqn = strq = sctp_select_a_stream(stcb, asoc);
6772                 locked = 0;
6773         }
6774
6775         while ((goal_mtu > 0) && strq) {
6776                 sp = TAILQ_FIRST(&strq->outqueue);
6777                 /*
6778                  * If CMT is off, we must validate that the stream in
6779                  * question has the first item pointed towards are network
6780                  * destionation requested by the caller. Note that if we
6781                  * turn out to be locked to a stream (assigning TSN's then
6782                  * we must stop, since we cannot look for another stream
6783                  * with data to send to that destination). In CMT's case, by
6784                  * skipping this check, we will send one data packet towards
6785                  * the requested net.
6786                  */
6787                 if (sp == NULL) {
6788                         break;
6789                 }
6790                 if ((sp->net != net) && (sctp_cmt_on_off == 0)) {
6791                         /* none for this network */
6792                         if (locked) {
6793                                 break;
6794                         } else {
6795                                 strq = sctp_select_a_stream(stcb, asoc);
6796                                 if (strq == NULL)
6797                                         /* none left */
6798                                         break;
6799                                 if (strqn == strq) {
6800                                         /* I have circled */
6801                                         break;
6802                                 }
6803                                 continue;
6804                         }
6805                 }
6806                 giveup = 0;
6807                 bail = 0;
6808                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
6809                     &giveup, eeor_mode, &bail);
6810                 asoc->last_out_stream = strq;
6811                 if (locked) {
6812                         asoc->locked_on_sending = strq;
6813                         if ((moved_how_much == 0) || (giveup) || bail)
6814                                 /* no more to move for now */
6815                                 break;
6816                 } else {
6817                         asoc->locked_on_sending = NULL;
6818                         strqt = sctp_select_a_stream(stcb, asoc);
6819                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
6820                                 if (strq == strqn) {
6821                                         /* Must move start to next one */
6822                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
6823                                         if (strqn == NULL) {
6824                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
6825                                                 if (strqn == NULL) {
6826                                                         break;
6827                                                 }
6828                                         }
6829                                 }
6830                                 sctp_remove_from_wheel(stcb, asoc, strq);
6831                         }
6832                         if ((giveup) || bail) {
6833                                 break;
6834                         }
6835                         strq = strqt;
6836                         if (strq == NULL) {
6837                                 break;
6838                         }
6839                 }
6840                 total_moved += moved_how_much;
6841                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
6842                 goal_mtu &= 0xfffffffc;
6843         }
6844         if (bail)
6845                 *quit_now = 1;
6846
6847         if (total_moved == 0) {
6848                 if ((sctp_cmt_on_off == 0) &&
6849                     (net == stcb->asoc.primary_destination)) {
6850                         /* ran dry for primary network net */
6851                         SCTP_STAT_INCR(sctps_primary_randry);
6852                 } else if (sctp_cmt_on_off) {
6853                         /* ran dry with CMT on */
6854                         SCTP_STAT_INCR(sctps_cmt_randry);
6855                 }
6856         }
6857 }
6858
6859 void
6860 sctp_fix_ecn_echo(struct sctp_association *asoc)
6861 {
6862         struct sctp_tmit_chunk *chk;
6863
6864         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
6865                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
6866                         chk->sent = SCTP_DATAGRAM_UNSENT;
6867                 }
6868         }
6869 }
6870
6871 static void
6872 sctp_move_to_an_alt(struct sctp_tcb *stcb,
6873     struct sctp_association *asoc,
6874     struct sctp_nets *net)
6875 {
6876         struct sctp_tmit_chunk *chk;
6877         struct sctp_nets *a_net;
6878
6879         SCTP_TCB_LOCK_ASSERT(stcb);
6880         /*
6881          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
6882          * destination using the PF algorithm for finding alternate
6883          * destinations.
6884          */
6885         if (sctp_cmt_on_off && sctp_cmt_pf) {
6886                 a_net = sctp_find_alternate_net(stcb, net, 2);
6887         } else {
6888                 a_net = sctp_find_alternate_net(stcb, net, 0);
6889         }
6890         if ((a_net != net) &&
6891             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
6892                 /*
6893                  * We only proceed if a valid alternate is found that is not
6894                  * this one and is reachable. Here we must move all chunks
6895                  * queued in the send queue off of the destination address
6896                  * to our alternate.
6897                  */
6898                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
6899                         if (chk->whoTo == net) {
6900                                 /* Move the chunk to our alternate */
6901                                 sctp_free_remote_addr(chk->whoTo);
6902                                 chk->whoTo = a_net;
6903                                 atomic_add_int(&a_net->ref_count, 1);
6904                         }
6905                 }
6906         }
6907 }
6908
6909 int
6910 sctp_med_chunk_output(struct sctp_inpcb *inp,
6911     struct sctp_tcb *stcb,
6912     struct sctp_association *asoc,
6913     int *num_out,
6914     int *reason_code,
6915     int control_only, int *cwnd_full, int from_where,
6916     struct timeval *now, int *now_filled, int frag_point, int so_locked
6917 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6918     SCTP_UNUSED
6919 #endif
6920 )
6921 {
6922         /*
6923          * Ok this is the generic chunk service queue. we must do the
6924          * following: - Service the stream queue that is next, moving any
6925          * message (note I must get a complete message i.e. FIRST/MIDDLE and
6926          * LAST to the out queue in one pass) and assigning TSN's - Check to
6927          * see if the cwnd/rwnd allows any output, if so we go ahead and
6928          * fomulate and send the low level chunks. Making sure to combine
6929          * any control in the control chunk queue also.
6930          */
6931         struct sctp_nets *net;
6932         struct mbuf *outchain, *endoutchain;
6933         struct sctp_tmit_chunk *chk, *nchk;
6934         struct sctphdr *shdr;
6935
6936         /* temp arrays for unlinking */
6937         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
6938         int no_fragmentflg, error;
6939         int one_chunk, hbflag, skip_data_for_this_net;
6940         int asconf, cookie, no_out_cnt;
6941         int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
6942         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
6943         struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
6944         int tsns_sent = 0;
6945         uint32_t auth_offset = 0;
6946         struct sctp_auth_chunk *auth = NULL;
6947
6948         /*
6949          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
6950          * destination.
6951          */
6952         int pf_hbflag = 0;
6953         int quit_now = 0;
6954
6955         *num_out = 0;
6956         cwnd_full_ind = 0;
6957
6958         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
6959             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
6960             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
6961                 eeor_mode = 1;
6962         } else {
6963                 eeor_mode = 0;
6964         }
6965         ctl_cnt = no_out_cnt = asconf = cookie = 0;
6966         /*
6967          * First lets prime the pump. For each destination, if there is room
6968          * in the flight size, attempt to pull an MTU's worth out of the
6969          * stream queues into the general send_queue
6970          */
6971 #ifdef SCTP_AUDITING_ENABLED
6972         sctp_audit_log(0xC2, 2);
6973 #endif
6974         SCTP_TCB_LOCK_ASSERT(stcb);
6975         hbflag = 0;
6976         if ((control_only) || (asoc->stream_reset_outstanding))
6977                 no_data_chunks = 1;
6978         else
6979                 no_data_chunks = 0;
6980
6981         /* Nothing to possible to send? */
6982         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
6983             TAILQ_EMPTY(&asoc->send_queue) &&
6984             TAILQ_EMPTY(&asoc->out_wheel)) {
6985                 *reason_code = 9;
6986                 return (0);
6987         }
6988         if (asoc->peers_rwnd == 0) {
6989                 /* No room in peers rwnd */
6990                 *cwnd_full = 1;
6991                 *reason_code = 1;
6992                 if (asoc->total_flight > 0) {
6993                         /* we are allowed one chunk in flight */
6994                         no_data_chunks = 1;
6995                 }
6996         }
6997         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
6998                 if (sctp_cmt_on_off) {
6999                         /*
7000                          * for CMT we start at the next one past the one we
7001                          * last added data to.
7002                          */
7003                         if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
7004                                 goto skip_the_fill_from_streams;
7005                         }
7006                         if (asoc->last_net_data_came_from) {
7007                                 net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
7008                                 if (net == NULL) {
7009                                         net = TAILQ_FIRST(&asoc->nets);
7010                                 }
7011                         } else {
7012                                 /* back to start */
7013                                 net = TAILQ_FIRST(&asoc->nets);
7014                         }
7015
7016                         /*
7017                          * JRI-TODO: CMT-MPI. Simply set the first
7018                          * destination (net) to be optimized for the next
7019                          * message to be pulled out of the outwheel. 1. peek
7020                          * at outwheel 2. If large message, set net =
7021                          * highest_cwnd 3. If small message, set net =
7022                          * lowest rtt
7023                          */
7024                 } else {
7025                         net = asoc->primary_destination;
7026                         if (net == NULL) {
7027                                 /* TSNH */
7028                                 net = TAILQ_FIRST(&asoc->nets);
7029                         }
7030                 }
7031                 start_at = net;
7032
7033 one_more_time:
7034                 for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7035                         net->window_probe = 0;
7036                         if (old_startat && (old_startat == net)) {
7037                                 break;
7038                         }
7039                         /*
7040                          * JRI: if dest is unreachable or unconfirmed, do
7041                          * not send data to it
7042                          */
7043                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7044                                 continue;
7045                         }
7046                         /*
7047                          * JRI: if dest is in PF state, do not send data to
7048                          * it
7049                          */
7050                         if (sctp_cmt_on_off && sctp_cmt_pf && (net->dest_state & SCTP_ADDR_PF)) {
7051                                 continue;
7052                         }
7053                         if ((sctp_cmt_on_off == 0) && (net->ref_count < 2)) {
7054                                 /* nothing can be in queue for this guy */
7055                                 continue;
7056                         }
7057                         if (net->flight_size >= net->cwnd) {
7058                                 /* skip this network, no room */
7059                                 cwnd_full_ind++;
7060                                 continue;
7061                         }
7062                         /*
7063                          * JRI : this for loop we are in takes in each net,
7064                          * if its's got space in cwnd and has data sent to
7065                          * it (when CMT is off) then it calls
7066                          * sctp_fill_outqueue for the net. This gets data on
7067                          * the send queue for that network.
7068                          *
7069                          * In sctp_fill_outqueue TSN's are assigned and data is
7070                          * copied out of the stream buffers. Note mostly
7071                          * copy by reference (we hope).
7072                          */
7073                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7074                                 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7075                         }
7076                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7077                         if (quit_now) {
7078                                 /* memory alloc failure */
7079                                 no_data_chunks = 1;
7080                                 goto skip_the_fill_from_streams;
7081                         }
7082                 }
7083                 if (start_at != TAILQ_FIRST(&asoc->nets)) {
7084                         /* got to pick up the beginning stuff. */
7085                         old_startat = start_at;
7086                         start_at = net = TAILQ_FIRST(&asoc->nets);
7087                         if (old_startat)
7088                                 goto one_more_time;
7089                 }
7090         }
7091 skip_the_fill_from_streams:
7092         *cwnd_full = cwnd_full_ind;
7093
7094         /* now service each destination and send out what we can for it */
7095         /* Nothing to send? */
7096         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7097             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7098                 *reason_code = 8;
7099                 return (0);
7100         }
7101         if (no_data_chunks) {
7102                 chk = TAILQ_FIRST(&asoc->control_send_queue);
7103         } else {
7104                 chk = TAILQ_FIRST(&asoc->send_queue);
7105         }
7106         if (chk) {
7107                 send_start_at = chk->whoTo;
7108         } else {
7109                 send_start_at = TAILQ_FIRST(&asoc->nets);
7110         }
7111         old_startat = NULL;
7112 again_one_more_time:
7113         for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7114                 /* how much can we send? */
7115                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7116                 if (old_startat && (old_startat == net)) {
7117                         /* through list ocmpletely. */
7118                         break;
7119                 }
7120                 tsns_sent = 0;
7121                 if (net->ref_count < 2) {
7122                         /*
7123                          * Ref-count of 1 so we cannot have data or control
7124                          * queued to this address. Skip it.
7125                          */
7126                         continue;
7127                 }
7128                 ctl_cnt = bundle_at = 0;
7129                 endoutchain = outchain = NULL;
7130                 no_fragmentflg = 1;
7131                 one_chunk = 0;
7132                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7133                         skip_data_for_this_net = 1;
7134                 } else {
7135                         skip_data_for_this_net = 0;
7136                 }
7137                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7138                         /*
7139                          * if we have a route and an ifp check to see if we
7140                          * have room to send to this guy
7141                          */
7142                         struct ifnet *ifp;
7143
7144                         ifp = net->ro.ro_rt->rt_ifp;
7145                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7146                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7147                                 if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
7148                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7149                                 }
7150                                 continue;
7151                         }
7152                 }
7153                 if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
7154                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7155                 } else {
7156                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7157                 }
7158                 mx_mtu = mtu;
7159                 to_out = 0;
7160                 if (mtu > asoc->peers_rwnd) {
7161                         if (asoc->total_flight > 0) {
7162                                 /* We have a packet in flight somewhere */
7163                                 r_mtu = asoc->peers_rwnd;
7164                         } else {
7165                                 /* We are always allowed to send one MTU out */
7166                                 one_chunk = 1;
7167                                 r_mtu = mtu;
7168                         }
7169                 } else {
7170                         r_mtu = mtu;
7171                 }
7172                 /************************/
7173                 /* Control transmission */
7174                 /************************/
7175                 /* Now first lets go through the control queue */
7176                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7177                     chk; chk = nchk) {
7178                         nchk = TAILQ_NEXT(chk, sctp_next);
7179                         if (chk->whoTo != net) {
7180                                 /*
7181                                  * No, not sent to the network we are
7182                                  * looking at
7183                                  */
7184                                 continue;
7185                         }
7186                         if (chk->data == NULL) {
7187                                 continue;
7188                         }
7189                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7190                                 /*
7191                                  * It must be unsent. Cookies and ASCONF's
7192                                  * hang around but there timers will force
7193                                  * when marked for resend.
7194                                  */
7195                                 continue;
7196                         }
7197                         /*
7198                          * if no AUTH is yet included and this chunk
7199                          * requires it, make sure to account for it.  We
7200                          * don't apply the size until the AUTH chunk is
7201                          * actually added below in case there is no room for
7202                          * this chunk. NOTE: we overload the use of "omtu"
7203                          * here
7204                          */
7205                         if ((auth == NULL) &&
7206                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7207                             stcb->asoc.peer_auth_chunks)) {
7208                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7209                         } else
7210                                 omtu = 0;
7211                         /* Here we do NOT factor the r_mtu */
7212                         if ((chk->send_size < (int)(mtu - omtu)) ||
7213                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7214                                 /*
7215                                  * We probably should glom the mbuf chain
7216                                  * from the chk->data for control but the
7217                                  * problem is it becomes yet one more level
7218                                  * of tracking to do if for some reason
7219                                  * output fails. Then I have got to
7220                                  * reconstruct the merged control chain.. el
7221                                  * yucko.. for now we take the easy way and
7222                                  * do the copy
7223                                  */
7224                                 /*
7225                                  * Add an AUTH chunk, if chunk requires it
7226                                  * save the offset into the chain for AUTH
7227                                  */
7228                                 if ((auth == NULL) &&
7229                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7230                                     stcb->asoc.peer_auth_chunks))) {
7231                                         outchain = sctp_add_auth_chunk(outchain,
7232                                             &endoutchain,
7233                                             &auth,
7234                                             &auth_offset,
7235                                             stcb,
7236                                             chk->rec.chunk_id.id);
7237                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7238                                 }
7239                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7240                                     (int)chk->rec.chunk_id.can_take_data,
7241                                     chk->send_size, chk->copy_by_ref);
7242                                 if (outchain == NULL) {
7243                                         *reason_code = 8;
7244                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7245                                         return (ENOMEM);
7246                                 }
7247                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7248                                 /* update our MTU size */
7249                                 if (mtu > (chk->send_size + omtu))
7250                                         mtu -= (chk->send_size + omtu);
7251                                 else
7252                                         mtu = 0;
7253                                 to_out += (chk->send_size + omtu);
7254                                 /* Do clear IP_DF ? */
7255                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7256                                         no_fragmentflg = 0;
7257                                 }
7258                                 if (chk->rec.chunk_id.can_take_data)
7259                                         chk->data = NULL;
7260                                 /* Mark things to be removed, if needed */
7261                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7262                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7263                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7264                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7265                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7266                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7267                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7268                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7269                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7270                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7271
7272                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7273                                                 hbflag = 1;
7274                                                 /*
7275                                                  * JRS 5/14/07 - Set the
7276                                                  * flag to say a heartbeat
7277                                                  * is being sent.
7278                                                  */
7279                                                 pf_hbflag = 1;
7280                                         }
7281                                         /* remove these chunks at the end */
7282                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7283                                                 /* turn off the timer */
7284                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7285                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7286                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7287                                                 }
7288                                         }
7289                                         ctl_cnt++;
7290                                 } else {
7291                                         /*
7292                                          * Other chunks, since they have
7293                                          * timers running (i.e. COOKIE or
7294                                          * ASCONF) we just "trust" that it
7295                                          * gets sent or retransmitted.
7296                                          */
7297                                         ctl_cnt++;
7298                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7299                                                 cookie = 1;
7300                                                 no_out_cnt = 1;
7301                                         } else if (chk->rec.chunk_id.id == SCTP_ASCONF) {
7302                                                 /*
7303                                                  * set hb flag since we can
7304                                                  * use these for RTO
7305                                                  */
7306                                                 hbflag = 1;
7307                                                 asconf = 1;
7308                                                 /*
7309                                                  * should sysctl this: don't
7310                                                  * bundle data with ASCONF
7311                                                  * since it requires AUTH
7312                                                  */
7313                                                 no_data_chunks = 1;
7314                                         }
7315                                         chk->sent = SCTP_DATAGRAM_SENT;
7316                                         chk->snd_count++;
7317                                 }
7318                                 if (mtu == 0) {
7319                                         /*
7320                                          * Ok we are out of room but we can
7321                                          * output without effecting the
7322                                          * flight size since this little guy
7323                                          * is a control only packet.
7324                                          */
7325                                         if (asconf) {
7326                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7327                                                 /*
7328                                                  * do NOT clear the asconf
7329                                                  * flag as it is used to do
7330                                                  * appropriate source
7331                                                  * address selection.
7332                                                  */
7333                                         }
7334                                         if (cookie) {
7335                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7336                                                 cookie = 0;
7337                                         }
7338                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7339                                         if (outchain == NULL) {
7340                                                 /* no memory */
7341                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7342                                                 error = ENOBUFS;
7343                                                 goto error_out_again;
7344                                         }
7345                                         shdr = mtod(outchain, struct sctphdr *);
7346                                         shdr->src_port = inp->sctp_lport;
7347                                         shdr->dest_port = stcb->rport;
7348                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7349                                         shdr->checksum = 0;
7350                                         auth_offset += sizeof(struct sctphdr);
7351                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7352                                             (struct sockaddr *)&net->ro._l_addr,
7353                                             outchain, auth_offset, auth,
7354                                             no_fragmentflg, 0, NULL, asconf, so_locked))) {
7355                                                 if (error == ENOBUFS) {
7356                                                         asoc->ifp_had_enobuf = 1;
7357                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7358                                                 }
7359                                                 if (from_where == 0) {
7360                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7361                                                 }
7362                                 error_out_again:
7363                                                 /* error, could not output */
7364                                                 if (hbflag) {
7365                                                         if (*now_filled == 0) {
7366                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7367                                                                 *now_filled = 1;
7368                                                                 *now = net->last_sent_time;
7369                                                         } else {
7370                                                                 net->last_sent_time = *now;
7371                                                         }
7372                                                         hbflag = 0;
7373                                                 }
7374                                                 if (error == EHOSTUNREACH) {
7375                                                         /*
7376                                                          * Destination went
7377                                                          * unreachable
7378                                                          * during this send
7379                                                          */
7380                                                         sctp_move_to_an_alt(stcb, asoc, net);
7381                                                 }
7382                                                 *reason_code = 7;
7383                                                 continue;
7384                                         } else
7385                                                 asoc->ifp_had_enobuf = 0;
7386                                         /* Only HB or ASCONF advances time */
7387                                         if (hbflag) {
7388                                                 if (*now_filled == 0) {
7389                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7390                                                         *now_filled = 1;
7391                                                         *now = net->last_sent_time;
7392                                                 } else {
7393                                                         net->last_sent_time = *now;
7394                                                 }
7395                                                 hbflag = 0;
7396                                         }
7397                                         /*
7398                                          * increase the number we sent, if a
7399                                          * cookie is sent we don't tell them
7400                                          * any was sent out.
7401                                          */
7402                                         outchain = endoutchain = NULL;
7403                                         auth = NULL;
7404                                         auth_offset = 0;
7405                                         if (!no_out_cnt)
7406                                                 *num_out += ctl_cnt;
7407                                         /* recalc a clean slate and setup */
7408                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7409                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7410                                         } else {
7411                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7412                                         }
7413                                         to_out = 0;
7414                                         no_fragmentflg = 1;
7415                                 }
7416                         }
7417                 }
7418                 /*********************/
7419                 /* Data transmission */
7420                 /*********************/
7421                 /*
7422                  * if AUTH for DATA is required and no AUTH has been added
7423                  * yet, account for this in the mtu now... if no data can be
7424                  * bundled, this adjustment won't matter anyways since the
7425                  * packet will be going out...
7426                  */
7427                 if ((auth == NULL) &&
7428                     sctp_auth_is_required_chunk(SCTP_DATA,
7429                     stcb->asoc.peer_auth_chunks)) {
7430                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7431                 }
7432                 /* now lets add any data within the MTU constraints */
7433                 if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
7434                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
7435                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7436                         else
7437                                 omtu = 0;
7438                 } else {
7439                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
7440                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7441                         else
7442                                 omtu = 0;
7443                 }
7444                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) && (skip_data_for_this_net == 0)) ||
7445                     (cookie)) {
7446                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
7447                                 if (no_data_chunks) {
7448                                         /* let only control go out */
7449                                         *reason_code = 1;
7450                                         break;
7451                                 }
7452                                 if (net->flight_size >= net->cwnd) {
7453                                         /* skip this net, no room for data */
7454                                         *reason_code = 2;
7455                                         break;
7456                                 }
7457                                 nchk = TAILQ_NEXT(chk, sctp_next);
7458                                 if (chk->whoTo != net) {
7459                                         /* No, not sent to this net */
7460                                         continue;
7461                                 }
7462                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
7463                                         /*-
7464                                          * strange, we have a chunk that is
7465                                          * to big for its destination and
7466                                          * yet no fragment ok flag.
7467                                          * Something went wrong when the
7468                                          * PMTU changed...we did not mark
7469                                          * this chunk for some reason?? I
7470                                          * will fix it here by letting IP
7471                                          * fragment it for now and printing
7472                                          * a warning. This really should not
7473                                          * happen ...
7474                                          */
7475                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
7476                                             chk->send_size, mtu);
7477                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
7478                                 }
7479                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
7480                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
7481                                         /* ok we will add this one */
7482
7483                                         /*
7484                                          * Add an AUTH chunk, if chunk
7485                                          * requires it, save the offset into
7486                                          * the chain for AUTH
7487                                          */
7488                                         if ((auth == NULL) &&
7489                                             (sctp_auth_is_required_chunk(SCTP_DATA,
7490                                             stcb->asoc.peer_auth_chunks))) {
7491
7492                                                 outchain = sctp_add_auth_chunk(outchain,
7493                                                     &endoutchain,
7494                                                     &auth,
7495                                                     &auth_offset,
7496                                                     stcb,
7497                                                     SCTP_DATA);
7498                                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7499                                         }
7500                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
7501                                             chk->send_size, chk->copy_by_ref);
7502                                         if (outchain == NULL) {
7503                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
7504                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
7505                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7506                                                 }
7507                                                 *reason_code = 3;
7508                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7509                                                 return (ENOMEM);
7510                                         }
7511                                         /* upate our MTU size */
7512                                         /* Do clear IP_DF ? */
7513                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7514                                                 no_fragmentflg = 0;
7515                                         }
7516                                         /* unsigned subtraction of mtu */
7517                                         if (mtu > chk->send_size)
7518                                                 mtu -= chk->send_size;
7519                                         else
7520                                                 mtu = 0;
7521                                         /* unsigned subtraction of r_mtu */
7522                                         if (r_mtu > chk->send_size)
7523                                                 r_mtu -= chk->send_size;
7524                                         else
7525                                                 r_mtu = 0;
7526
7527                                         to_out += chk->send_size;
7528                                         if ((to_out > mx_mtu) && no_fragmentflg) {
7529 #ifdef INVARIANTS
7530                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
7531 #else
7532                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
7533                                                     mx_mtu, to_out);
7534 #endif
7535                                         }
7536                                         chk->window_probe = 0;
7537                                         data_list[bundle_at++] = chk;
7538                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
7539                                                 mtu = 0;
7540                                                 break;
7541                                         }
7542                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
7543                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
7544                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
7545                                                 } else {
7546                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
7547                                                 }
7548                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
7549                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
7550                                                         /*
7551                                                          * Count number of
7552                                                          * user msg's that
7553                                                          * were fragmented
7554                                                          * we do this by
7555                                                          * counting when we
7556                                                          * see a LAST
7557                                                          * fragment only.
7558                                                          */
7559                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
7560                                         }
7561                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
7562                                                 if (one_chunk) {
7563                                                         data_list[0]->window_probe = 1;
7564                                                         net->window_probe = 1;
7565                                                 }
7566                                                 break;
7567                                         }
7568                                 } else {
7569                                         /*
7570                                          * Must be sent in order of the
7571                                          * TSN's (on a network)
7572                                          */
7573                                         break;
7574                                 }
7575                         }       /* for (chunk gather loop for this net) */
7576                 }               /* if asoc.state OPEN */
7577                 /* Is there something to send for this destination? */
7578                 if (outchain) {
7579                         /* We may need to start a control timer or two */
7580                         if (asconf) {
7581                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
7582                                     stcb, net);
7583                                 /*
7584                                  * do NOT clear the asconf flag as it is
7585                                  * used to do appropriate source address
7586                                  * selection.
7587                                  */
7588                         }
7589                         if (cookie) {
7590                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7591                                 cookie = 0;
7592                         }
7593                         /* must start a send timer if data is being sent */
7594                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
7595                                 /*
7596                                  * no timer running on this destination
7597                                  * restart it.
7598                                  */
7599                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7600                         } else if (sctp_cmt_on_off && sctp_cmt_pf && pf_hbflag && ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)
7601                             && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
7602                                 /*
7603                                  * JRS 5/14/07 - If a HB has been sent to a
7604                                  * PF destination and no T3 timer is
7605                                  * currently running, start the T3 timer to
7606                                  * track the HBs that were sent.
7607                                  */
7608                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7609                         }
7610                         /* Now send it, if there is anything to send :> */
7611                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7612                         if (outchain == NULL) {
7613                                 /* out of mbufs */
7614                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7615                                 error = ENOBUFS;
7616                                 goto errored_send;
7617                         }
7618                         shdr = mtod(outchain, struct sctphdr *);
7619                         shdr->src_port = inp->sctp_lport;
7620                         shdr->dest_port = stcb->rport;
7621                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7622                         shdr->checksum = 0;
7623                         auth_offset += sizeof(struct sctphdr);
7624                         if ((error = sctp_lowlevel_chunk_output(inp,
7625                             stcb,
7626                             net,
7627                             (struct sockaddr *)&net->ro._l_addr,
7628                             outchain,
7629                             auth_offset,
7630                             auth,
7631                             no_fragmentflg,
7632                             bundle_at,
7633                             data_list[0],
7634                             asconf, so_locked))) {
7635                                 /* error, we could not output */
7636                                 if (error == ENOBUFS) {
7637                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7638                                         asoc->ifp_had_enobuf = 1;
7639                                 }
7640                                 if (from_where == 0) {
7641                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7642                                 }
7643                 errored_send:
7644                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
7645                                 if (hbflag) {
7646                                         if (*now_filled == 0) {
7647                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7648                                                 *now_filled = 1;
7649                                                 *now = net->last_sent_time;
7650                                         } else {
7651                                                 net->last_sent_time = *now;
7652                                         }
7653                                         hbflag = 0;
7654                                 }
7655                                 if (error == EHOSTUNREACH) {
7656                                         /*
7657                                          * Destination went unreachable
7658                                          * during this send
7659                                          */
7660                                         sctp_move_to_an_alt(stcb, asoc, net);
7661                                 }
7662                                 *reason_code = 6;
7663                                 /*-
7664                                  * I add this line to be paranoid. As far as
7665                                  * I can tell the continue, takes us back to
7666                                  * the top of the for, but just to make sure
7667                                  * I will reset these again here.
7668                                  */
7669                                 ctl_cnt = bundle_at = 0;
7670                                 continue;       /* This takes us back to the
7671                                                  * for() for the nets. */
7672                         } else {
7673                                 asoc->ifp_had_enobuf = 0;
7674                         }
7675                         outchain = endoutchain = NULL;
7676                         auth = NULL;
7677                         auth_offset = 0;
7678                         if (bundle_at || hbflag) {
7679                                 /* For data/asconf and hb set time */
7680                                 if (*now_filled == 0) {
7681                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7682                                         *now_filled = 1;
7683                                         *now = net->last_sent_time;
7684                                 } else {
7685                                         net->last_sent_time = *now;
7686                                 }
7687                         }
7688                         if (!no_out_cnt) {
7689                                 *num_out += (ctl_cnt + bundle_at);
7690                         }
7691                         if (bundle_at) {
7692                                 /* setup for a RTO measurement */
7693                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
7694                                 /* fill time if not already filled */
7695                                 if (*now_filled == 0) {
7696                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
7697                                         *now_filled = 1;
7698                                         *now = asoc->time_last_sent;
7699                                 } else {
7700                                         asoc->time_last_sent = *now;
7701                                 }
7702                                 data_list[0]->do_rtt = 1;
7703                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
7704                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
7705                                 if (sctp_early_fr) {
7706                                         if (net->flight_size < net->cwnd) {
7707                                                 /* start or restart it */
7708                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
7709                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
7710                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
7711                                                 }
7712                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
7713                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
7714                                         } else {
7715                                                 /* stop it if its running */
7716                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
7717                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
7718                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
7719                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
7720                                                 }
7721                                         }
7722                                 }
7723                         }
7724                         if (one_chunk) {
7725                                 break;
7726                         }
7727                 }
7728                 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7729                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
7730                 }
7731         }
7732         if (old_startat == NULL) {
7733                 old_startat = send_start_at;
7734                 send_start_at = TAILQ_FIRST(&asoc->nets);
7735                 if (old_startat)
7736                         goto again_one_more_time;
7737         }
7738         /*
7739          * At the end there should be no NON timed chunks hanging on this
7740          * queue.
7741          */
7742         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7743                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
7744         }
7745         if ((*num_out == 0) && (*reason_code == 0)) {
7746                 *reason_code = 4;
7747         } else {
7748                 *reason_code = 5;
7749         }
7750         sctp_clean_up_ctl(stcb, asoc);
7751         return (0);
7752 }
7753
7754 void
7755 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
7756 {
7757         /*-
7758          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
7759          * the control chunk queue.
7760          */
7761         struct sctp_chunkhdr *hdr;
7762         struct sctp_tmit_chunk *chk;
7763         struct mbuf *mat;
7764
7765         SCTP_TCB_LOCK_ASSERT(stcb);
7766         sctp_alloc_a_chunk(stcb, chk);
7767         if (chk == NULL) {
7768                 /* no memory */
7769                 sctp_m_freem(op_err);
7770                 return;
7771         }
7772         chk->copy_by_ref = 0;
7773         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
7774         if (op_err == NULL) {
7775                 sctp_free_a_chunk(stcb, chk);
7776                 return;
7777         }
7778         chk->send_size = 0;
7779         mat = op_err;
7780         while (mat != NULL) {
7781                 chk->send_size += SCTP_BUF_LEN(mat);
7782                 mat = SCTP_BUF_NEXT(mat);
7783         }
7784         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
7785         chk->rec.chunk_id.can_take_data = 1;
7786         chk->sent = SCTP_DATAGRAM_UNSENT;
7787         chk->snd_count = 0;
7788         chk->flags = 0;
7789         chk->asoc = &stcb->asoc;
7790         chk->data = op_err;
7791         chk->whoTo = chk->asoc->primary_destination;
7792         atomic_add_int(&chk->whoTo->ref_count, 1);
7793         hdr = mtod(op_err, struct sctp_chunkhdr *);
7794         hdr->chunk_type = SCTP_OPERATION_ERROR;
7795         hdr->chunk_flags = 0;
7796         hdr->chunk_length = htons(chk->send_size);
7797         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
7798             chk,
7799             sctp_next);
7800         chk->asoc->ctrl_queue_cnt++;
7801 }
7802
7803 int
7804 sctp_send_cookie_echo(struct mbuf *m,
7805     int offset,
7806     struct sctp_tcb *stcb,
7807     struct sctp_nets *net)
7808 {
7809         /*-
7810          * pull out the cookie and put it at the front of the control chunk
7811          * queue.
7812          */
7813         int at;
7814         struct mbuf *cookie;
7815         struct sctp_paramhdr parm, *phdr;
7816         struct sctp_chunkhdr *hdr;
7817         struct sctp_tmit_chunk *chk;
7818         uint16_t ptype, plen;
7819
7820         /* First find the cookie in the param area */
7821         cookie = NULL;
7822         at = offset + sizeof(struct sctp_init_chunk);
7823
7824         SCTP_TCB_LOCK_ASSERT(stcb);
7825         do {
7826                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
7827                 if (phdr == NULL) {
7828                         return (-3);
7829                 }
7830                 ptype = ntohs(phdr->param_type);
7831                 plen = ntohs(phdr->param_length);
7832                 if (ptype == SCTP_STATE_COOKIE) {
7833                         int pad;
7834
7835                         /* found the cookie */
7836                         if ((pad = (plen % 4))) {
7837                                 plen += 4 - pad;
7838                         }
7839                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
7840                         if (cookie == NULL) {
7841                                 /* No memory */
7842                                 return (-2);
7843                         }
7844                         break;
7845                 }
7846                 at += SCTP_SIZE32(plen);
7847         } while (phdr);
7848         if (cookie == NULL) {
7849                 /* Did not find the cookie */
7850                 return (-3);
7851         }
7852         /* ok, we got the cookie lets change it into a cookie echo chunk */
7853
7854         /* first the change from param to cookie */
7855         hdr = mtod(cookie, struct sctp_chunkhdr *);
7856         hdr->chunk_type = SCTP_COOKIE_ECHO;
7857         hdr->chunk_flags = 0;
7858         /* get the chunk stuff now and place it in the FRONT of the queue */
7859         sctp_alloc_a_chunk(stcb, chk);
7860         if (chk == NULL) {
7861                 /* no memory */
7862                 sctp_m_freem(cookie);
7863                 return (-5);
7864         }
7865         chk->copy_by_ref = 0;
7866         chk->send_size = plen;
7867         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
7868         chk->rec.chunk_id.can_take_data = 0;
7869         chk->sent = SCTP_DATAGRAM_UNSENT;
7870         chk->snd_count = 0;
7871         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
7872         chk->asoc = &stcb->asoc;
7873         chk->data = cookie;
7874         chk->whoTo = chk->asoc->primary_destination;
7875         atomic_add_int(&chk->whoTo->ref_count, 1);
7876         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
7877         chk->asoc->ctrl_queue_cnt++;
7878         return (0);
7879 }
7880
7881 void
7882 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
7883     struct mbuf *m,
7884     int offset,
7885     int chk_length,
7886     struct sctp_nets *net)
7887 {
7888         /*
7889          * take a HB request and make it into a HB ack and send it.
7890          */
7891         struct mbuf *outchain;
7892         struct sctp_chunkhdr *chdr;
7893         struct sctp_tmit_chunk *chk;
7894
7895
7896         if (net == NULL)
7897                 /* must have a net pointer */
7898                 return;
7899
7900         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
7901         if (outchain == NULL) {
7902                 /* gak out of memory */
7903                 return;
7904         }
7905         chdr = mtod(outchain, struct sctp_chunkhdr *);
7906         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
7907         chdr->chunk_flags = 0;
7908         if (chk_length % 4) {
7909                 /* need pad */
7910                 uint32_t cpthis = 0;
7911                 int padlen;
7912
7913                 padlen = 4 - (chk_length % 4);
7914                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
7915         }
7916         sctp_alloc_a_chunk(stcb, chk);
7917         if (chk == NULL) {
7918                 /* no memory */
7919                 sctp_m_freem(outchain);
7920                 return;
7921         }
7922         chk->copy_by_ref = 0;
7923         chk->send_size = chk_length;
7924         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
7925         chk->rec.chunk_id.can_take_data = 1;
7926         chk->sent = SCTP_DATAGRAM_UNSENT;
7927         chk->snd_count = 0;
7928         chk->flags = 0;
7929         chk->asoc = &stcb->asoc;
7930         chk->data = outchain;
7931         chk->whoTo = net;
7932         atomic_add_int(&chk->whoTo->ref_count, 1);
7933         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
7934         chk->asoc->ctrl_queue_cnt++;
7935 }
7936
7937 void
7938 sctp_send_cookie_ack(struct sctp_tcb *stcb)
7939 {
7940         /* formulate and queue a cookie-ack back to sender */
7941         struct mbuf *cookie_ack;
7942         struct sctp_chunkhdr *hdr;
7943         struct sctp_tmit_chunk *chk;
7944
7945         cookie_ack = NULL;
7946         SCTP_TCB_LOCK_ASSERT(stcb);
7947
7948         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
7949         if (cookie_ack == NULL) {
7950                 /* no mbuf's */
7951                 return;
7952         }
7953         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
7954         sctp_alloc_a_chunk(stcb, chk);
7955         if (chk == NULL) {
7956                 /* no memory */
7957                 sctp_m_freem(cookie_ack);
7958                 return;
7959         }
7960         chk->copy_by_ref = 0;
7961         chk->send_size = sizeof(struct sctp_chunkhdr);
7962         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
7963         chk->rec.chunk_id.can_take_data = 1;
7964         chk->sent = SCTP_DATAGRAM_UNSENT;
7965         chk->snd_count = 0;
7966         chk->flags = 0;
7967         chk->asoc = &stcb->asoc;
7968         chk->data = cookie_ack;
7969         if (chk->asoc->last_control_chunk_from != NULL) {
7970                 chk->whoTo = chk->asoc->last_control_chunk_from;
7971         } else {
7972                 chk->whoTo = chk->asoc->primary_destination;
7973         }
7974         atomic_add_int(&chk->whoTo->ref_count, 1);
7975         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
7976         hdr->chunk_type = SCTP_COOKIE_ACK;
7977         hdr->chunk_flags = 0;
7978         hdr->chunk_length = htons(chk->send_size);
7979         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
7980         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
7981         chk->asoc->ctrl_queue_cnt++;
7982         return;
7983 }
7984
7985
7986 void
7987 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
7988 {
7989         /* formulate and queue a SHUTDOWN-ACK back to the sender */
7990         struct mbuf *m_shutdown_ack;
7991         struct sctp_shutdown_ack_chunk *ack_cp;
7992         struct sctp_tmit_chunk *chk;
7993
7994         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
7995         if (m_shutdown_ack == NULL) {
7996                 /* no mbuf's */
7997                 return;
7998         }
7999         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8000         sctp_alloc_a_chunk(stcb, chk);
8001         if (chk == NULL) {
8002                 /* no memory */
8003                 sctp_m_freem(m_shutdown_ack);
8004                 return;
8005         }
8006         chk->copy_by_ref = 0;
8007         chk->send_size = sizeof(struct sctp_chunkhdr);
8008         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8009         chk->rec.chunk_id.can_take_data = 1;
8010         chk->sent = SCTP_DATAGRAM_UNSENT;
8011         chk->snd_count = 0;
8012         chk->flags = 0;
8013         chk->asoc = &stcb->asoc;
8014         chk->data = m_shutdown_ack;
8015         chk->whoTo = net;
8016         atomic_add_int(&net->ref_count, 1);
8017
8018         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8019         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8020         ack_cp->ch.chunk_flags = 0;
8021         ack_cp->ch.chunk_length = htons(chk->send_size);
8022         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8023         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8024         chk->asoc->ctrl_queue_cnt++;
8025         return;
8026 }
8027
8028 void
8029 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8030 {
8031         /* formulate and queue a SHUTDOWN to the sender */
8032         struct mbuf *m_shutdown;
8033         struct sctp_shutdown_chunk *shutdown_cp;
8034         struct sctp_tmit_chunk *chk;
8035
8036         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8037         if (m_shutdown == NULL) {
8038                 /* no mbuf's */
8039                 return;
8040         }
8041         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8042         sctp_alloc_a_chunk(stcb, chk);
8043         if (chk == NULL) {
8044                 /* no memory */
8045                 sctp_m_freem(m_shutdown);
8046                 return;
8047         }
8048         chk->copy_by_ref = 0;
8049         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8050         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8051         chk->rec.chunk_id.can_take_data = 1;
8052         chk->sent = SCTP_DATAGRAM_UNSENT;
8053         chk->snd_count = 0;
8054         chk->flags = 0;
8055         chk->asoc = &stcb->asoc;
8056         chk->data = m_shutdown;
8057         chk->whoTo = net;
8058         atomic_add_int(&net->ref_count, 1);
8059
8060         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8061         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8062         shutdown_cp->ch.chunk_flags = 0;
8063         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8064         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8065         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8066         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8067         chk->asoc->ctrl_queue_cnt++;
8068         return;
8069 }
8070
8071 void
8072 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8073 {
8074         /*
8075          * formulate and queue an ASCONF to the peer. ASCONF parameters
8076          * should be queued on the assoc queue.
8077          */
8078         struct sctp_tmit_chunk *chk;
8079         struct mbuf *m_asconf;
8080         struct sctp_asconf_chunk *acp;
8081         int len;
8082
8083         SCTP_TCB_LOCK_ASSERT(stcb);
8084         /* compose an ASCONF chunk, maximum length is PMTU */
8085         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8086         if (m_asconf == NULL) {
8087                 return;
8088         }
8089         acp = mtod(m_asconf, struct sctp_asconf_chunk *);
8090         sctp_alloc_a_chunk(stcb, chk);
8091         if (chk == NULL) {
8092                 /* no memory */
8093                 sctp_m_freem(m_asconf);
8094                 return;
8095         }
8096         chk->copy_by_ref = 0;
8097         chk->data = m_asconf;
8098         chk->send_size = len;
8099         chk->rec.chunk_id.id = SCTP_ASCONF;
8100         chk->rec.chunk_id.can_take_data = 0;
8101         chk->sent = SCTP_DATAGRAM_UNSENT;
8102         chk->snd_count = 0;
8103         chk->flags = 0;
8104         chk->asoc = &stcb->asoc;
8105         chk->whoTo = chk->asoc->primary_destination;
8106         atomic_add_int(&chk->whoTo->ref_count, 1);
8107         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8108         chk->asoc->ctrl_queue_cnt++;
8109         return;
8110 }
8111
8112 void
8113 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8114 {
8115         /*
8116          * formulate and queue a asconf-ack back to sender. the asconf-ack
8117          * must be stored in the tcb.
8118          */
8119         struct sctp_tmit_chunk *chk;
8120         struct sctp_asconf_ack *ack, *latest_ack;
8121         struct mbuf *m_ack, *m;
8122         struct sctp_nets *net = NULL;
8123
8124         SCTP_TCB_LOCK_ASSERT(stcb);
8125         /* Get the latest ASCONF-ACK */
8126         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8127         if (latest_ack == NULL) {
8128                 return;
8129         }
8130         if (latest_ack->last_sent_to != NULL &&
8131             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8132                 /* we're doing a retransmission */
8133                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8134                 if (net == NULL) {
8135                         /* no alternate */
8136                         if (stcb->asoc.last_control_chunk_from == NULL)
8137                                 net = stcb->asoc.primary_destination;
8138                         else
8139                                 net = stcb->asoc.last_control_chunk_from;
8140                 }
8141         } else {
8142                 /* normal case */
8143                 if (stcb->asoc.last_control_chunk_from == NULL)
8144                         net = stcb->asoc.primary_destination;
8145                 else
8146                         net = stcb->asoc.last_control_chunk_from;
8147         }
8148         latest_ack->last_sent_to = net;
8149
8150         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8151                 if (ack->data == NULL) {
8152                         continue;
8153                 }
8154                 /* copy the asconf_ack */
8155                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8156                 if (m_ack == NULL) {
8157                         /* couldn't copy it */
8158                         return;
8159                 }
8160                 sctp_alloc_a_chunk(stcb, chk);
8161                 if (chk == NULL) {
8162                         /* no memory */
8163                         if (m_ack)
8164                                 sctp_m_freem(m_ack);
8165                         return;
8166                 }
8167                 chk->copy_by_ref = 0;
8168
8169                 chk->whoTo = net;
8170                 chk->data = m_ack;
8171                 chk->send_size = 0;
8172                 /* Get size */
8173                 m = m_ack;
8174                 chk->send_size = ack->len;
8175                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8176                 chk->rec.chunk_id.can_take_data = 1;
8177                 chk->sent = SCTP_DATAGRAM_UNSENT;
8178                 chk->snd_count = 0;
8179                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8180                 chk->asoc = &stcb->asoc;
8181                 atomic_add_int(&chk->whoTo->ref_count, 1);
8182
8183                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8184                 chk->asoc->ctrl_queue_cnt++;
8185         }
8186         return;
8187 }
8188
8189
8190 static int
8191 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8192     struct sctp_tcb *stcb,
8193     struct sctp_association *asoc,
8194     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8195 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8196     SCTP_UNUSED
8197 #endif
8198 )
8199 {
8200         /*-
8201          * send out one MTU of retransmission. If fast_retransmit is
8202          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8203          * rwnd. For a Cookie or Asconf in the control chunk queue we
8204          * retransmit them by themselves.
8205          *
8206          * For data chunks we will pick out the lowest TSN's in the sent_queue
8207          * marked for resend and bundle them all together (up to a MTU of
8208          * destination). The address to send to should have been
8209          * selected/changed where the retransmission was marked (i.e. in FR
8210          * or t3-timeout routines).
8211          */
8212         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8213         struct sctp_tmit_chunk *chk, *fwd;
8214         struct mbuf *m, *endofchain;
8215         struct sctphdr *shdr;
8216         int asconf;
8217         struct sctp_nets *net = NULL;
8218         uint32_t tsns_sent = 0;
8219         int no_fragmentflg, bundle_at, cnt_thru;
8220         unsigned int mtu;
8221         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8222         struct sctp_auth_chunk *auth = NULL;
8223         uint32_t auth_offset = 0;
8224         uint32_t dmtu = 0;
8225
8226         SCTP_TCB_LOCK_ASSERT(stcb);
8227         tmr_started = ctl_cnt = bundle_at = error = 0;
8228         no_fragmentflg = 1;
8229         asconf = 0;
8230         fwd_tsn = 0;
8231         *cnt_out = 0;
8232         fwd = NULL;
8233         endofchain = m = NULL;
8234 #ifdef SCTP_AUDITING_ENABLED
8235         sctp_audit_log(0xC3, 1);
8236 #endif
8237         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8238             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8239                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8240                     asoc->sent_queue_retran_cnt);
8241                 asoc->sent_queue_cnt = 0;
8242                 asoc->sent_queue_cnt_removeable = 0;
8243                 /* send back 0/0 so we enter normal transmission */
8244                 *cnt_out = 0;
8245                 return (0);
8246         }
8247         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8248                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8249                     (chk->rec.chunk_id.id == SCTP_ASCONF) ||
8250                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8251                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8252                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8253                                 if (chk != asoc->str_reset) {
8254                                         /*
8255                                          * not eligible for retran if its
8256                                          * not ours
8257                                          */
8258                                         continue;
8259                                 }
8260                         }
8261                         ctl_cnt++;
8262                         if (chk->rec.chunk_id.id == SCTP_ASCONF) {
8263                                 no_fragmentflg = 1;
8264                                 asconf = 1;
8265                         }
8266                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8267                                 fwd_tsn = 1;
8268                                 fwd = chk;
8269                         }
8270                         /*
8271                          * Add an AUTH chunk, if chunk requires it save the
8272                          * offset into the chain for AUTH
8273                          */
8274                         if ((auth == NULL) &&
8275                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8276                             stcb->asoc.peer_auth_chunks))) {
8277                                 m = sctp_add_auth_chunk(m, &endofchain,
8278                                     &auth, &auth_offset,
8279                                     stcb,
8280                                     chk->rec.chunk_id.id);
8281                         }
8282                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8283                         break;
8284                 }
8285         }
8286         one_chunk = 0;
8287         cnt_thru = 0;
8288         /* do we have control chunks to retransmit? */
8289         if (m != NULL) {
8290                 /* Start a timer no matter if we suceed or fail */
8291                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8292                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8293                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8294                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8295
8296                 SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
8297                 if (m == NULL) {
8298                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8299                         return (ENOBUFS);
8300                 }
8301                 shdr = mtod(m, struct sctphdr *);
8302                 shdr->src_port = inp->sctp_lport;
8303                 shdr->dest_port = stcb->rport;
8304                 shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8305                 shdr->checksum = 0;
8306                 auth_offset += sizeof(struct sctphdr);
8307                 chk->snd_count++;       /* update our count */
8308
8309                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8310                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m, auth_offset,
8311                     auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
8312                         SCTP_STAT_INCR(sctps_lowlevelerr);
8313                         return (error);
8314                 }
8315                 m = endofchain = NULL;
8316                 auth = NULL;
8317                 auth_offset = 0;
8318                 /*
8319                  * We don't want to mark the net->sent time here since this
8320                  * we use this for HB and retrans cannot measure RTT
8321                  */
8322                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8323                 *cnt_out += 1;
8324                 chk->sent = SCTP_DATAGRAM_SENT;
8325                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8326                 if (fwd_tsn == 0) {
8327                         return (0);
8328                 } else {
8329                         /* Clean up the fwd-tsn list */
8330                         sctp_clean_up_ctl(stcb, asoc);
8331                         return (0);
8332                 }
8333         }
8334         /*
8335          * Ok, it is just data retransmission we need to do or that and a
8336          * fwd-tsn with it all.
8337          */
8338         if (TAILQ_EMPTY(&asoc->sent_queue)) {
8339                 return (SCTP_RETRAN_DONE);
8340         }
8341         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
8342             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
8343                 /* not yet open, resend the cookie and that is it */
8344                 return (1);
8345         }
8346 #ifdef SCTP_AUDITING_ENABLED
8347         sctp_auditing(20, inp, stcb, NULL);
8348 #endif
8349         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
8350                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
8351                         /* No, not sent to this net or not ready for rtx */
8352                         continue;
8353                 }
8354                 if ((sctp_max_retran_chunk) && (chk->snd_count >= sctp_max_retran_chunk)) {
8355                         /* Gak, we have exceeded max unlucky retran, abort! */
8356                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
8357                             chk->snd_count,
8358                             sctp_max_retran_chunk);
8359                         atomic_add_int(&stcb->asoc.refcnt, 1);
8360                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
8361                         SCTP_TCB_LOCK(stcb);
8362                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
8363                         return (SCTP_RETRAN_EXIT);
8364                 }
8365                 /* pick up the net */
8366                 net = chk->whoTo;
8367                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8368                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8369                 } else {
8370                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8371                 }
8372
8373                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
8374                         /* No room in peers rwnd */
8375                         uint32_t tsn;
8376
8377                         tsn = asoc->last_acked_seq + 1;
8378                         if (tsn == chk->rec.data.TSN_seq) {
8379                                 /*
8380                                  * we make a special exception for this
8381                                  * case. The peer has no rwnd but is missing
8382                                  * the lowest chunk.. which is probably what
8383                                  * is holding up the rwnd.
8384                                  */
8385                                 goto one_chunk_around;
8386                         }
8387                         return (1);
8388                 }
8389 one_chunk_around:
8390                 if (asoc->peers_rwnd < mtu) {
8391                         one_chunk = 1;
8392                         if ((asoc->peers_rwnd == 0) &&
8393                             (asoc->total_flight == 0)) {
8394                                 chk->window_probe = 1;
8395                                 chk->whoTo->window_probe = 1;
8396                         }
8397                 }
8398 #ifdef SCTP_AUDITING_ENABLED
8399                 sctp_audit_log(0xC3, 2);
8400 #endif
8401                 bundle_at = 0;
8402                 m = NULL;
8403                 net->fast_retran_ip = 0;
8404                 if (chk->rec.data.doing_fast_retransmit == 0) {
8405                         /*
8406                          * if no FR in progress skip destination that have
8407                          * flight_size > cwnd.
8408                          */
8409                         if (net->flight_size >= net->cwnd) {
8410                                 continue;
8411                         }
8412                 } else {
8413                         /*
8414                          * Mark the destination net to have FR recovery
8415                          * limits put on it.
8416                          */
8417                         *fr_done = 1;
8418                         net->fast_retran_ip = 1;
8419                 }
8420
8421                 /*
8422                  * if no AUTH is yet included and this chunk requires it,
8423                  * make sure to account for it.  We don't apply the size
8424                  * until the AUTH chunk is actually added below in case
8425                  * there is no room for this chunk.
8426                  */
8427                 if ((auth == NULL) &&
8428                     sctp_auth_is_required_chunk(SCTP_DATA,
8429                     stcb->asoc.peer_auth_chunks)) {
8430                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8431                 } else
8432                         dmtu = 0;
8433
8434                 if ((chk->send_size <= (mtu - dmtu)) ||
8435                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8436                         /* ok we will add this one */
8437                         if ((auth == NULL) &&
8438                             (sctp_auth_is_required_chunk(SCTP_DATA,
8439                             stcb->asoc.peer_auth_chunks))) {
8440                                 m = sctp_add_auth_chunk(m, &endofchain,
8441                                     &auth, &auth_offset,
8442                                     stcb, SCTP_DATA);
8443                         }
8444                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8445                         if (m == NULL) {
8446                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8447                                 return (ENOMEM);
8448                         }
8449                         /* Do clear IP_DF ? */
8450                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8451                                 no_fragmentflg = 0;
8452                         }
8453                         /* upate our MTU size */
8454                         if (mtu > (chk->send_size + dmtu))
8455                                 mtu -= (chk->send_size + dmtu);
8456                         else
8457                                 mtu = 0;
8458                         data_list[bundle_at++] = chk;
8459                         if (one_chunk && (asoc->total_flight <= 0)) {
8460                                 SCTP_STAT_INCR(sctps_windowprobed);
8461                         }
8462                 }
8463                 if (one_chunk == 0) {
8464                         /*
8465                          * now are there anymore forward from chk to pick
8466                          * up?
8467                          */
8468                         fwd = TAILQ_NEXT(chk, sctp_next);
8469                         while (fwd) {
8470                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
8471                                         /* Nope, not for retran */
8472                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8473                                         continue;
8474                                 }
8475                                 if (fwd->whoTo != net) {
8476                                         /* Nope, not the net in question */
8477                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8478                                         continue;
8479                                 }
8480                                 if ((auth == NULL) &&
8481                                     sctp_auth_is_required_chunk(SCTP_DATA,
8482                                     stcb->asoc.peer_auth_chunks)) {
8483                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8484                                 } else
8485                                         dmtu = 0;
8486                                 if (fwd->send_size <= (mtu - dmtu)) {
8487                                         if ((auth == NULL) &&
8488                                             (sctp_auth_is_required_chunk(SCTP_DATA,
8489                                             stcb->asoc.peer_auth_chunks))) {
8490                                                 m = sctp_add_auth_chunk(m,
8491                                                     &endofchain,
8492                                                     &auth, &auth_offset,
8493                                                     stcb,
8494                                                     SCTP_DATA);
8495                                         }
8496                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
8497                                         if (m == NULL) {
8498                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8499                                                 return (ENOMEM);
8500                                         }
8501                                         /* Do clear IP_DF ? */
8502                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8503                                                 no_fragmentflg = 0;
8504                                         }
8505                                         /* upate our MTU size */
8506                                         if (mtu > (fwd->send_size + dmtu))
8507                                                 mtu -= (fwd->send_size + dmtu);
8508                                         else
8509                                                 mtu = 0;
8510                                         data_list[bundle_at++] = fwd;
8511                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8512                                                 break;
8513                                         }
8514                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8515                                 } else {
8516                                         /* can't fit so we are done */
8517                                         break;
8518                                 }
8519                         }
8520                 }
8521                 /* Is there something to send for this destination? */
8522                 if (m) {
8523                         /*
8524                          * No matter if we fail/or suceed we should start a
8525                          * timer. A failure is like a lost IP packet :-)
8526                          */
8527                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8528                                 /*
8529                                  * no timer running on this destination
8530                                  * restart it.
8531                                  */
8532                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8533                                 tmr_started = 1;
8534                         }
8535                         SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
8536                         if (m == NULL) {
8537                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8538                                 return (ENOBUFS);
8539                         }
8540                         shdr = mtod(m, struct sctphdr *);
8541                         shdr->src_port = inp->sctp_lport;
8542                         shdr->dest_port = stcb->rport;
8543                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8544                         shdr->checksum = 0;
8545                         auth_offset += sizeof(struct sctphdr);
8546                         /* Now lets send it, if there is anything to send :> */
8547                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8548                             (struct sockaddr *)&net->ro._l_addr, m, auth_offset,
8549                             auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
8550                                 /* error, we could not output */
8551                                 SCTP_STAT_INCR(sctps_lowlevelerr);
8552                                 return (error);
8553                         }
8554                         m = endofchain = NULL;
8555                         auth = NULL;
8556                         auth_offset = 0;
8557                         /* For HB's */
8558                         /*
8559                          * We don't want to mark the net->sent time here
8560                          * since this we use this for HB and retrans cannot
8561                          * measure RTT
8562                          */
8563                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
8564
8565                         /* For auto-close */
8566                         cnt_thru++;
8567                         if (*now_filled == 0) {
8568                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8569                                 *now = asoc->time_last_sent;
8570                                 *now_filled = 1;
8571                         } else {
8572                                 asoc->time_last_sent = *now;
8573                         }
8574                         *cnt_out += bundle_at;
8575 #ifdef SCTP_AUDITING_ENABLED
8576                         sctp_audit_log(0xC4, bundle_at);
8577 #endif
8578                         if (bundle_at) {
8579                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8580                         }
8581                         for (i = 0; i < bundle_at; i++) {
8582                                 SCTP_STAT_INCR(sctps_sendretransdata);
8583                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
8584                                 /*
8585                                  * When we have a revoked data, and we
8586                                  * retransmit it, then we clear the revoked
8587                                  * flag since this flag dictates if we
8588                                  * subtracted from the fs
8589                                  */
8590                                 if (data_list[i]->rec.data.chunk_was_revoked) {
8591                                         /* Deflate the cwnd */
8592                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
8593                                         data_list[i]->rec.data.chunk_was_revoked = 0;
8594                                 }
8595                                 data_list[i]->snd_count++;
8596                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8597                                 /* record the time */
8598                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
8599                                 if (data_list[i]->book_size_scale) {
8600                                         /*
8601                                          * need to double the book size on
8602                                          * this one
8603                                          */
8604                                         data_list[i]->book_size_scale = 0;
8605                                         /*
8606                                          * Since we double the booksize, we
8607                                          * must also double the output queue
8608                                          * size, since this get shrunk when
8609                                          * we free by this amount.
8610                                          */
8611                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
8612                                         data_list[i]->book_size *= 2;
8613
8614
8615                                 } else {
8616                                         if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
8617                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
8618                                                     asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
8619                                         }
8620                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
8621                                             (uint32_t) (data_list[i]->send_size +
8622                                             sctp_peer_chunk_oh));
8623                                 }
8624                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
8625                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
8626                                             data_list[i]->whoTo->flight_size,
8627                                             data_list[i]->book_size,
8628                                             (uintptr_t) data_list[i]->whoTo,
8629                                             data_list[i]->rec.data.TSN_seq);
8630                                 }
8631                                 sctp_flight_size_increase(data_list[i]);
8632                                 sctp_total_flight_increase(stcb, data_list[i]);
8633                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
8634                                         /* SWS sender side engages */
8635                                         asoc->peers_rwnd = 0;
8636                                 }
8637                                 if ((i == 0) &&
8638                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
8639                                         SCTP_STAT_INCR(sctps_sendfastretrans);
8640                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
8641                                             (tmr_started == 0)) {
8642                                                 /*-
8643                                                  * ok we just fast-retrans'd
8644                                                  * the lowest TSN, i.e the
8645                                                  * first on the list. In
8646                                                  * this case we want to give
8647                                                  * some more time to get a
8648                                                  * SACK back without a
8649                                                  * t3-expiring.
8650                                                  */
8651                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
8652                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
8653                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8654                                         }
8655                                 }
8656                         }
8657                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8658                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
8659                         }
8660 #ifdef SCTP_AUDITING_ENABLED
8661                         sctp_auditing(21, inp, stcb, NULL);
8662 #endif
8663                 } else {
8664                         /* None will fit */
8665                         return (1);
8666                 }
8667                 if (asoc->sent_queue_retran_cnt <= 0) {
8668                         /* all done we have no more to retran */
8669                         asoc->sent_queue_retran_cnt = 0;
8670                         break;
8671                 }
8672                 if (one_chunk) {
8673                         /* No more room in rwnd */
8674                         return (1);
8675                 }
8676                 /* stop the for loop here. we sent out a packet */
8677                 break;
8678         }
8679         return (0);
8680 }
8681
8682
8683 static int
8684 sctp_timer_validation(struct sctp_inpcb *inp,
8685     struct sctp_tcb *stcb,
8686     struct sctp_association *asoc,
8687     int ret)
8688 {
8689         struct sctp_nets *net;
8690
8691         /* Validate that a timer is running somewhere */
8692         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
8693                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8694                         /* Here is a timer */
8695                         return (ret);
8696                 }
8697         }
8698         SCTP_TCB_LOCK_ASSERT(stcb);
8699         /* Gak, we did not have a timer somewhere */
8700         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
8701         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
8702         return (ret);
8703 }
8704
8705 void
8706 sctp_chunk_output(struct sctp_inpcb *inp,
8707     struct sctp_tcb *stcb,
8708     int from_where,
8709     int so_locked
8710 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8711     SCTP_UNUSED
8712 #endif
8713 )
8714 {
8715         /*-
8716          * Ok this is the generic chunk service queue. we must do the
8717          * following:
8718          * - See if there are retransmits pending, if so we must
8719          *   do these first.
8720          * - Service the stream queue that is next, moving any
8721          *   message (note I must get a complete message i.e.
8722          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
8723          *   TSN's
8724          * - Check to see if the cwnd/rwnd allows any output, if so we
8725          *   go ahead and fomulate and send the low level chunks. Making sure
8726          *   to combine any control in the control chunk queue also.
8727          */
8728         struct sctp_association *asoc;
8729         struct sctp_nets *net;
8730         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
8731             burst_cnt = 0, burst_limit = 0;
8732         struct timeval now;
8733         int now_filled = 0;
8734         int cwnd_full = 0;
8735         int nagle_on = 0;
8736         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
8737         int un_sent = 0;
8738         int fr_done, tot_frs = 0;
8739
8740         asoc = &stcb->asoc;
8741         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
8742                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
8743                         nagle_on = 0;
8744                 } else {
8745                         nagle_on = 1;
8746                 }
8747         }
8748         SCTP_TCB_LOCK_ASSERT(stcb);
8749
8750         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
8751
8752         if ((un_sent <= 0) &&
8753             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
8754             (asoc->sent_queue_retran_cnt == 0)) {
8755                 /* Nothing to do unless there is something to be sent left */
8756                 return;
8757         }
8758         /*
8759          * Do we have something to send, data or control AND a sack timer
8760          * running, if so piggy-back the sack.
8761          */
8762         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8763                 sctp_send_sack(stcb);
8764                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
8765         }
8766         while (asoc->sent_queue_retran_cnt) {
8767                 /*-
8768                  * Ok, it is retransmission time only, we send out only ONE
8769                  * packet with a single call off to the retran code.
8770                  */
8771                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
8772                         /*-
8773                          * Special hook for handling cookiess discarded
8774                          * by peer that carried data. Send cookie-ack only
8775                          * and then the next call with get the retran's.
8776                          */
8777                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
8778                             &cwnd_full, from_where,
8779                             &now, &now_filled, frag_point, so_locked);
8780                         return;
8781                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
8782                         /* if its not from a HB then do it */
8783                         fr_done = 0;
8784                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
8785                         if (fr_done) {
8786                                 tot_frs++;
8787                         }
8788                 } else {
8789                         /*
8790                          * its from any other place, we don't allow retran
8791                          * output (only control)
8792                          */
8793                         ret = 1;
8794                 }
8795                 if (ret > 0) {
8796                         /* Can't send anymore */
8797                         /*-
8798                          * now lets push out control by calling med-level
8799                          * output once. this assures that we WILL send HB's
8800                          * if queued too.
8801                          */
8802                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
8803                             &cwnd_full, from_where,
8804                             &now, &now_filled, frag_point, so_locked);
8805 #ifdef SCTP_AUDITING_ENABLED
8806                         sctp_auditing(8, inp, stcb, NULL);
8807 #endif
8808                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
8809                         return;
8810                 }
8811                 if (ret < 0) {
8812                         /*-
8813                          * The count was off.. retran is not happening so do
8814                          * the normal retransmission.
8815                          */
8816 #ifdef SCTP_AUDITING_ENABLED
8817                         sctp_auditing(9, inp, stcb, NULL);
8818 #endif
8819                         if (ret == SCTP_RETRAN_EXIT) {
8820                                 return;
8821                         }
8822                         break;
8823                 }
8824                 if (from_where == SCTP_OUTPUT_FROM_T3) {
8825                         /* Only one transmission allowed out of a timeout */
8826 #ifdef SCTP_AUDITING_ENABLED
8827                         sctp_auditing(10, inp, stcb, NULL);
8828 #endif
8829                         /* Push out any control */
8830                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
8831                             &now, &now_filled, frag_point, so_locked);
8832                         return;
8833                 }
8834                 if (tot_frs > asoc->max_burst) {
8835                         /* Hit FR burst limit */
8836                         return;
8837                 }
8838                 if ((num_out == 0) && (ret == 0)) {
8839
8840                         /* No more retrans to send */
8841                         break;
8842                 }
8843         }
8844 #ifdef SCTP_AUDITING_ENABLED
8845         sctp_auditing(12, inp, stcb, NULL);
8846 #endif
8847         /* Check for bad destinations, if they exist move chunks around. */
8848         burst_limit = asoc->max_burst;
8849         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
8850                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
8851                     SCTP_ADDR_NOT_REACHABLE) {
8852                         /*-
8853                          * if possible move things off of this address we
8854                          * still may send below due to the dormant state but
8855                          * we try to find an alternate address to send to
8856                          * and if we have one we move all queued data on the
8857                          * out wheel to this alternate address.
8858                          */
8859                         if (net->ref_count > 1)
8860                                 sctp_move_to_an_alt(stcb, asoc, net);
8861                 } else if (sctp_cmt_on_off && sctp_cmt_pf && ((net->dest_state & SCTP_ADDR_PF) ==
8862                     SCTP_ADDR_PF)) {
8863                         /*
8864                          * JRS 5/14/07 - If CMT PF is on and the current
8865                          * destination is in PF state, move all queued data
8866                          * to an alternate desination.
8867                          */
8868                         if (net->ref_count > 1)
8869                                 sctp_move_to_an_alt(stcb, asoc, net);
8870                 } else {
8871                         /*-
8872                          * if ((asoc->sat_network) || (net->addr_is_local))
8873                          * { burst_limit = asoc->max_burst *
8874                          * SCTP_SAT_NETWORK_BURST_INCR; }
8875                          */
8876                         if (sctp_use_cwnd_based_maxburst) {
8877                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
8878                                         /*
8879                                          * JRS - Use the congestion control
8880                                          * given in the congestion control
8881                                          * module
8882                                          */
8883                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
8884                                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
8885                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
8886                                         }
8887                                         SCTP_STAT_INCR(sctps_maxburstqueued);
8888                                 }
8889                                 net->fast_retran_ip = 0;
8890                         } else {
8891                                 if (net->flight_size == 0) {
8892                                         /* Should be decaying the cwnd here */
8893                                         ;
8894                                 }
8895                         }
8896                 }
8897
8898         }
8899         burst_cnt = 0;
8900         cwnd_full = 0;
8901         do {
8902                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
8903                     &reason_code, 0, &cwnd_full, from_where,
8904                     &now, &now_filled, frag_point, so_locked);
8905                 if (error) {
8906                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
8907                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
8908                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
8909                         }
8910                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8911                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
8912                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
8913                         }
8914                         break;
8915                 }
8916                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
8917
8918                 tot_out += num_out;
8919                 burst_cnt++;
8920                 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8921                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
8922                         if (num_out == 0) {
8923                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
8924                         }
8925                 }
8926                 if (nagle_on) {
8927                         /*-
8928                          * When nagle is on, we look at how much is un_sent, then
8929                          * if its smaller than an MTU and we have data in
8930                          * flight we stop.
8931                          */
8932                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
8933                             ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count)
8934                             * sizeof(struct sctp_data_chunk)));
8935                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
8936                             (stcb->asoc.total_flight > 0)) {
8937                                 break;
8938                         }
8939                 }
8940                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8941                     TAILQ_EMPTY(&asoc->send_queue) &&
8942                     TAILQ_EMPTY(&asoc->out_wheel)) {
8943                         /* Nothing left to send */
8944                         break;
8945                 }
8946                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
8947                         /* Nothing left to send */
8948                         break;
8949                 }
8950         } while (num_out && (sctp_use_cwnd_based_maxburst ||
8951             (burst_cnt < burst_limit)));
8952
8953         if (sctp_use_cwnd_based_maxburst == 0) {
8954                 if (burst_cnt >= burst_limit) {
8955                         SCTP_STAT_INCR(sctps_maxburstqueued);
8956                         asoc->burst_limit_applied = 1;
8957                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
8958                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
8959                         }
8960                 } else {
8961                         asoc->burst_limit_applied = 0;
8962                 }
8963         }
8964         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8965                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
8966         }
8967         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
8968             tot_out);
8969
8970         /*-
8971          * Now we need to clean up the control chunk chain if a ECNE is on
8972          * it. It must be marked as UNSENT again so next call will continue
8973          * to send it until such time that we get a CWR, to remove it.
8974          */
8975         if (stcb->asoc.ecn_echo_cnt_onq)
8976                 sctp_fix_ecn_echo(asoc);
8977         return;
8978 }
8979
8980
8981 int
8982 sctp_output(inp, m, addr, control, p, flags)
8983         struct sctp_inpcb *inp;
8984         struct mbuf *m;
8985         struct sockaddr *addr;
8986         struct mbuf *control;
8987         struct thread *p;
8988         int flags;
8989 {
8990         if (inp == NULL) {
8991                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
8992                 return (EINVAL);
8993         }
8994         if (inp->sctp_socket == NULL) {
8995                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
8996                 return (EINVAL);
8997         }
8998         return (sctp_sosend(inp->sctp_socket,
8999             addr,
9000             (struct uio *)NULL,
9001             m,
9002             control,
9003             flags, p
9004             ));
9005 }
9006
9007 void
9008 send_forward_tsn(struct sctp_tcb *stcb,
9009     struct sctp_association *asoc)
9010 {
9011         struct sctp_tmit_chunk *chk;
9012         struct sctp_forward_tsn_chunk *fwdtsn;
9013
9014         SCTP_TCB_LOCK_ASSERT(stcb);
9015         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9016                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9017                         /* mark it to unsent */
9018                         chk->sent = SCTP_DATAGRAM_UNSENT;
9019                         chk->snd_count = 0;
9020                         /* Do we correct its output location? */
9021                         if (chk->whoTo != asoc->primary_destination) {
9022                                 sctp_free_remote_addr(chk->whoTo);
9023                                 chk->whoTo = asoc->primary_destination;
9024                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9025                         }
9026                         goto sctp_fill_in_rest;
9027                 }
9028         }
9029         /* Ok if we reach here we must build one */
9030         sctp_alloc_a_chunk(stcb, chk);
9031         if (chk == NULL) {
9032                 return;
9033         }
9034         chk->copy_by_ref = 0;
9035         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9036         chk->rec.chunk_id.can_take_data = 0;
9037         chk->asoc = asoc;
9038         chk->whoTo = NULL;
9039
9040         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9041         if (chk->data == NULL) {
9042                 sctp_free_a_chunk(stcb, chk);
9043                 return;
9044         }
9045         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9046         chk->sent = SCTP_DATAGRAM_UNSENT;
9047         chk->snd_count = 0;
9048         chk->whoTo = asoc->primary_destination;
9049         atomic_add_int(&chk->whoTo->ref_count, 1);
9050         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9051         asoc->ctrl_queue_cnt++;
9052 sctp_fill_in_rest:
9053         /*-
9054          * Here we go through and fill out the part that deals with
9055          * stream/seq of the ones we skip.
9056          */
9057         SCTP_BUF_LEN(chk->data) = 0;
9058         {
9059                 struct sctp_tmit_chunk *at, *tp1, *last;
9060                 struct sctp_strseq *strseq;
9061                 unsigned int cnt_of_space, i, ovh;
9062                 unsigned int space_needed;
9063                 unsigned int cnt_of_skipped = 0;
9064
9065                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9066                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9067                                 /* no more to look at */
9068                                 break;
9069                         }
9070                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9071                                 /* We don't report these */
9072                                 continue;
9073                         }
9074                         cnt_of_skipped++;
9075                 }
9076                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9077                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9078
9079                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9080
9081                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9082                         ovh = SCTP_MIN_OVERHEAD;
9083                 } else {
9084                         ovh = SCTP_MIN_V4_OVERHEAD;
9085                 }
9086                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9087                         /* trim to a mtu size */
9088                         cnt_of_space = asoc->smallest_mtu - ovh;
9089                 }
9090                 if (cnt_of_space < space_needed) {
9091                         /*-
9092                          * ok we must trim down the chunk by lowering the
9093                          * advance peer ack point.
9094                          */
9095                         cnt_of_skipped = (cnt_of_space -
9096                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9097                             sizeof(struct sctp_strseq)));
9098                         /*-
9099                          * Go through and find the TSN that will be the one
9100                          * we report.
9101                          */
9102                         at = TAILQ_FIRST(&asoc->sent_queue);
9103                         for (i = 0; i < cnt_of_skipped; i++) {
9104                                 tp1 = TAILQ_NEXT(at, sctp_next);
9105                                 at = tp1;
9106                         }
9107                         last = at;
9108                         /*-
9109                          * last now points to last one I can report, update
9110                          * peer ack point
9111                          */
9112                         asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
9113                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9114                 }
9115                 chk->send_size = space_needed;
9116                 /* Setup the chunk */
9117                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9118                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9119                 fwdtsn->ch.chunk_flags = 0;
9120                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9121                 fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
9122                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9123                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9124                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9125                 fwdtsn++;
9126                 /*-
9127                  * Move pointer to after the fwdtsn and transfer to the
9128                  * strseq pointer.
9129                  */
9130                 strseq = (struct sctp_strseq *)fwdtsn;
9131                 /*-
9132                  * Now populate the strseq list. This is done blindly
9133                  * without pulling out duplicate stream info. This is
9134                  * inefficent but won't harm the process since the peer will
9135                  * look at these in sequence and will thus release anything.
9136                  * It could mean we exceed the PMTU and chop off some that
9137                  * we could have included.. but this is unlikely (aka 1432/4
9138                  * would mean 300+ stream seq's would have to be reported in
9139                  * one FWD-TSN. With a bit of work we can later FIX this to
9140                  * optimize and pull out duplcates.. but it does add more
9141                  * overhead. So for now... not!
9142                  */
9143                 at = TAILQ_FIRST(&asoc->sent_queue);
9144                 for (i = 0; i < cnt_of_skipped; i++) {
9145                         tp1 = TAILQ_NEXT(at, sctp_next);
9146                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9147                                 /* We don't report these */
9148                                 i--;
9149                                 at = tp1;
9150                                 continue;
9151                         }
9152                         strseq->stream = ntohs(at->rec.data.stream_number);
9153                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9154                         strseq++;
9155                         at = tp1;
9156                 }
9157         }
9158         return;
9159
9160 }
9161
9162 void
9163 sctp_send_sack(struct sctp_tcb *stcb)
9164 {
9165         /*-
9166          * Queue up a SACK in the control queue. We must first check to see
9167          * if a SACK is somehow on the control queue. If so, we will take
9168          * and and remove the old one.
9169          */
9170         struct sctp_association *asoc;
9171         struct sctp_tmit_chunk *chk, *a_chk;
9172         struct sctp_sack_chunk *sack;
9173         struct sctp_gap_ack_block *gap_descriptor;
9174         struct sack_track *selector;
9175         int mergeable = 0;
9176         int offset;
9177         caddr_t limit;
9178         uint32_t *dup;
9179         int limit_reached = 0;
9180         unsigned int i, jstart, siz, j;
9181         unsigned int num_gap_blocks = 0, space;
9182         int num_dups = 0;
9183         int space_req;
9184
9185         a_chk = NULL;
9186         asoc = &stcb->asoc;
9187         SCTP_TCB_LOCK_ASSERT(stcb);
9188         if (asoc->last_data_chunk_from == NULL) {
9189                 /* Hmm we never received anything */
9190                 return;
9191         }
9192         sctp_set_rwnd(stcb, asoc);
9193         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9194                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9195                         /* Hmm, found a sack already on queue, remove it */
9196                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9197                         asoc->ctrl_queue_cnt++;
9198                         a_chk = chk;
9199                         if (a_chk->data) {
9200                                 sctp_m_freem(a_chk->data);
9201                                 a_chk->data = NULL;
9202                         }
9203                         sctp_free_remote_addr(a_chk->whoTo);
9204                         a_chk->whoTo = NULL;
9205                         break;
9206                 }
9207         }
9208         if (a_chk == NULL) {
9209                 sctp_alloc_a_chunk(stcb, a_chk);
9210                 if (a_chk == NULL) {
9211                         /* No memory so we drop the idea, and set a timer */
9212                         if (stcb->asoc.delayed_ack) {
9213                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9214                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9215                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9216                                     stcb->sctp_ep, stcb, NULL);
9217                         } else {
9218                                 stcb->asoc.send_sack = 1;
9219                         }
9220                         return;
9221                 }
9222                 a_chk->copy_by_ref = 0;
9223                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9224                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9225                 a_chk->rec.chunk_id.can_take_data = 1;
9226         }
9227         /* Clear our pkt counts */
9228         asoc->data_pkts_seen = 0;
9229
9230         a_chk->asoc = asoc;
9231         a_chk->snd_count = 0;
9232         a_chk->send_size = 0;   /* fill in later */
9233         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9234         a_chk->whoTo = NULL;
9235
9236         if ((asoc->numduptsns) ||
9237             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9238             ) {
9239                 /*-
9240                  * Ok, we have some duplicates or the destination for the
9241                  * sack is unreachable, lets see if we can select an
9242                  * alternate than asoc->last_data_chunk_from
9243                  */
9244                 if ((!(asoc->last_data_chunk_from->dest_state &
9245                     SCTP_ADDR_NOT_REACHABLE)) &&
9246                     (asoc->used_alt_onsack > asoc->numnets)) {
9247                         /* We used an alt last time, don't this time */
9248                         a_chk->whoTo = NULL;
9249                 } else {
9250                         asoc->used_alt_onsack++;
9251                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9252                 }
9253                 if (a_chk->whoTo == NULL) {
9254                         /* Nope, no alternate */
9255                         a_chk->whoTo = asoc->last_data_chunk_from;
9256                         asoc->used_alt_onsack = 0;
9257                 }
9258         } else {
9259                 /*
9260                  * No duplicates so we use the last place we received data
9261                  * from.
9262                  */
9263                 asoc->used_alt_onsack = 0;
9264                 a_chk->whoTo = asoc->last_data_chunk_from;
9265         }
9266         if (a_chk->whoTo) {
9267                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9268         }
9269         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
9270                 /* no gaps */
9271                 space_req = sizeof(struct sctp_sack_chunk);
9272         } else {
9273                 /* gaps get a cluster */
9274                 space_req = MCLBYTES;
9275         }
9276         /* Ok now lets formulate a MBUF with our sack */
9277         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9278         if ((a_chk->data == NULL) ||
9279             (a_chk->whoTo == NULL)) {
9280                 /* rats, no mbuf memory */
9281                 if (a_chk->data) {
9282                         /* was a problem with the destination */
9283                         sctp_m_freem(a_chk->data);
9284                         a_chk->data = NULL;
9285                 }
9286                 sctp_free_a_chunk(stcb, a_chk);
9287                 /* sa_ignore NO_NULL_CHK */
9288                 if (stcb->asoc.delayed_ack) {
9289                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9290                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
9291                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9292                             stcb->sctp_ep, stcb, NULL);
9293                 } else {
9294                         stcb->asoc.send_sack = 1;
9295                 }
9296                 return;
9297         }
9298         /* ok, lets go through and fill it in */
9299         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
9300         space = M_TRAILINGSPACE(a_chk->data);
9301         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
9302                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
9303         }
9304         limit = mtod(a_chk->data, caddr_t);
9305         limit += space;
9306
9307         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
9308         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
9309         /* 0x01 is used by nonce for ecn */
9310         if ((sctp_ecn_enable) &&
9311             (sctp_ecn_nonce) &&
9312             (asoc->peer_supports_ecn_nonce))
9313                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
9314         else
9315                 sack->ch.chunk_flags = 0;
9316
9317         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
9318                 /*-
9319                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
9320                  * received, then set high bit to 1, else 0. Reset
9321                  * pkts_rcvd.
9322                  */
9323                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
9324                 asoc->cmt_dac_pkts_rcvd = 0;
9325         }
9326 #ifdef SCTP_ASOCLOG_OF_TSNS
9327         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
9328         stcb->asoc.cumack_log_atsnt++;
9329         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
9330                 stcb->asoc.cumack_log_atsnt = 0;
9331         }
9332 #endif
9333         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
9334         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
9335         asoc->my_last_reported_rwnd = asoc->my_rwnd;
9336
9337         /* reset the readers interpretation */
9338         stcb->freed_by_sorcv_sincelast = 0;
9339
9340         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
9341
9342         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
9343         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
9344                 offset = 1;
9345                 /*-
9346                  * cum-ack behind the mapping array, so we start and use all
9347                  * entries.
9348                  */
9349                 jstart = 0;
9350         } else {
9351                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
9352                 /*-
9353                  * we skip the first one when the cum-ack is at or above the
9354                  * mapping array base. Note this only works if
9355                  */
9356                 jstart = 1;
9357         }
9358         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
9359                 /* we have a gap .. maybe */
9360                 for (i = 0; i < siz; i++) {
9361                         selector = &sack_array[asoc->mapping_array[i]];
9362                         if (mergeable && selector->right_edge) {
9363                                 /*
9364                                  * Backup, left and right edges were ok to
9365                                  * merge.
9366                                  */
9367                                 num_gap_blocks--;
9368                                 gap_descriptor--;
9369                         }
9370                         if (selector->num_entries == 0)
9371                                 mergeable = 0;
9372                         else {
9373                                 for (j = jstart; j < selector->num_entries; j++) {
9374                                         if (mergeable && selector->right_edge) {
9375                                                 /*
9376                                                  * do a merge by NOT setting
9377                                                  * the left side
9378                                                  */
9379                                                 mergeable = 0;
9380                                         } else {
9381                                                 /*
9382                                                  * no merge, set the left
9383                                                  * side
9384                                                  */
9385                                                 mergeable = 0;
9386                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
9387                                         }
9388                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
9389                                         num_gap_blocks++;
9390                                         gap_descriptor++;
9391                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
9392                                                 /* no more room */
9393                                                 limit_reached = 1;
9394                                                 break;
9395                                         }
9396                                 }
9397                                 if (selector->left_edge) {
9398                                         mergeable = 1;
9399                                 }
9400                         }
9401                         if (limit_reached) {
9402                                 /* Reached the limit stop */
9403                                 break;
9404                         }
9405                         jstart = 0;
9406                         offset += 8;
9407                 }
9408                 if (num_gap_blocks == 0) {
9409                         /*
9410                          * slide not yet happened, and somehow we got called
9411                          * to send a sack. Cumack needs to move up.
9412                          */
9413                         int abort_flag = 0;
9414
9415                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
9416                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
9417                         sctp_sack_check(stcb, 0, 0, &abort_flag);
9418                 }
9419         }
9420         /* now we must add any dups we are going to report. */
9421         if ((limit_reached == 0) && (asoc->numduptsns)) {
9422                 dup = (uint32_t *) gap_descriptor;
9423                 for (i = 0; i < asoc->numduptsns; i++) {
9424                         *dup = htonl(asoc->dup_tsns[i]);
9425                         dup++;
9426                         num_dups++;
9427                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
9428                                 /* no more room */
9429                                 break;
9430                         }
9431                 }
9432                 asoc->numduptsns = 0;
9433         }
9434         /*
9435          * now that the chunk is prepared queue it to the control chunk
9436          * queue.
9437          */
9438         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
9439             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
9440             (num_dups * sizeof(int32_t)));
9441         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
9442         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
9443         sack->sack.num_dup_tsns = htons(num_dups);
9444         sack->ch.chunk_length = htons(a_chk->send_size);
9445         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
9446         asoc->ctrl_queue_cnt++;
9447         asoc->send_sack = 0;
9448         SCTP_STAT_INCR(sctps_sendsacks);
9449         return;
9450 }
9451
9452
9453 void
9454 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
9455 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9456     SCTP_UNUSED
9457 #endif
9458 )
9459 {
9460         struct mbuf *m_abort;
9461         struct mbuf *m_out = NULL, *m_end = NULL;
9462         struct sctp_abort_chunk *abort = NULL;
9463         int sz;
9464         uint32_t auth_offset = 0;
9465         struct sctp_auth_chunk *auth = NULL;
9466         struct sctphdr *shdr;
9467
9468         /*-
9469          * Add an AUTH chunk, if chunk requires it and save the offset into
9470          * the chain for AUTH
9471          */
9472         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
9473             stcb->asoc.peer_auth_chunks)) {
9474                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
9475                     stcb, SCTP_ABORT_ASSOCIATION);
9476         }
9477         SCTP_TCB_LOCK_ASSERT(stcb);
9478         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9479         if (m_abort == NULL) {
9480                 /* no mbuf's */
9481                 if (m_out)
9482                         sctp_m_freem(m_out);
9483                 return;
9484         }
9485         /* link in any error */
9486         SCTP_BUF_NEXT(m_abort) = operr;
9487         sz = 0;
9488         if (operr) {
9489                 struct mbuf *n;
9490
9491                 n = operr;
9492                 while (n) {
9493                         sz += SCTP_BUF_LEN(n);
9494                         n = SCTP_BUF_NEXT(n);
9495                 }
9496         }
9497         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
9498         if (m_out == NULL) {
9499                 /* NO Auth chunk prepended, so reserve space in front */
9500                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
9501                 m_out = m_abort;
9502         } else {
9503                 /* Put AUTH chunk at the front of the chain */
9504                 SCTP_BUF_NEXT(m_end) = m_abort;
9505         }
9506
9507         /* fill in the ABORT chunk */
9508         abort = mtod(m_abort, struct sctp_abort_chunk *);
9509         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
9510         abort->ch.chunk_flags = 0;
9511         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
9512
9513         /* prepend and fill in the SCTP header */
9514         SCTP_BUF_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
9515         if (m_out == NULL) {
9516                 /* TSNH: no memory */
9517                 return;
9518         }
9519         shdr = mtod(m_out, struct sctphdr *);
9520         shdr->src_port = stcb->sctp_ep->sctp_lport;
9521         shdr->dest_port = stcb->rport;
9522         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
9523         shdr->checksum = 0;
9524         auth_offset += sizeof(struct sctphdr);
9525
9526         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
9527             stcb->asoc.primary_destination,
9528             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
9529             m_out, auth_offset, auth, 1, 0, NULL, 0, so_locked);
9530         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9531 }
9532
9533 void
9534 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
9535     struct sctp_nets *net)
9536 {
9537         /* formulate and SEND a SHUTDOWN-COMPLETE */
9538         struct mbuf *m_shutdown_comp;
9539         struct sctp_shutdown_complete_msg *comp_cp;
9540
9541         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 0, M_DONTWAIT, 1, MT_HEADER);
9542         if (m_shutdown_comp == NULL) {
9543                 /* no mbuf's */
9544                 return;
9545         }
9546         comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
9547         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
9548         comp_cp->shut_cmp.ch.chunk_flags = 0;
9549         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
9550         comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
9551         comp_cp->sh.dest_port = stcb->rport;
9552         comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
9553         comp_cp->sh.checksum = 0;
9554
9555         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
9556         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
9557             (struct sockaddr *)&net->ro._l_addr,
9558             m_shutdown_comp, 0, NULL, 1, 0, NULL, 0, SCTP_SO_NOT_LOCKED);
9559         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9560         return;
9561 }
9562
9563 void
9564 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
9565     uint32_t vrf_id)
9566 {
9567         /* formulate and SEND a SHUTDOWN-COMPLETE */
9568         struct mbuf *o_pak;
9569         struct mbuf *mout;
9570         struct ip *iph, *iph_out;
9571         struct ip6_hdr *ip6, *ip6_out;
9572         int offset_out, len, mlen;
9573         struct sctp_shutdown_complete_msg *comp_cp;
9574
9575         /* Get room for the largest message */
9576         len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
9577         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
9578         if (mout == NULL) {
9579                 return;
9580         }
9581         SCTP_BUF_LEN(mout) = len;
9582         iph = mtod(m, struct ip *);
9583         iph_out = NULL;
9584         ip6_out = NULL;
9585         offset_out = 0;
9586         if (iph->ip_v == IPVERSION) {
9587                 SCTP_BUF_LEN(mout) = sizeof(struct ip) +
9588                     sizeof(struct sctp_shutdown_complete_msg);
9589                 SCTP_BUF_NEXT(mout) = NULL;
9590                 iph_out = mtod(mout, struct ip *);
9591
9592                 /* Fill in the IP header for the ABORT */
9593                 iph_out->ip_v = IPVERSION;
9594                 iph_out->ip_hl = (sizeof(struct ip) / 4);
9595                 iph_out->ip_tos = (u_char)0;
9596                 iph_out->ip_id = 0;
9597                 iph_out->ip_off = 0;
9598                 iph_out->ip_ttl = MAXTTL;
9599                 iph_out->ip_p = IPPROTO_SCTP;
9600                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
9601                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
9602
9603                 /* let IP layer calculate this */
9604                 iph_out->ip_sum = 0;
9605                 offset_out += sizeof(*iph_out);
9606                 comp_cp = (struct sctp_shutdown_complete_msg *)(
9607                     (caddr_t)iph_out + offset_out);
9608         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
9609                 ip6 = (struct ip6_hdr *)iph;
9610                 SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr) +
9611                     sizeof(struct sctp_shutdown_complete_msg);
9612                 SCTP_BUF_NEXT(mout) = NULL;
9613                 ip6_out = mtod(mout, struct ip6_hdr *);
9614
9615                 /* Fill in the IPv6 header for the ABORT */
9616                 ip6_out->ip6_flow = ip6->ip6_flow;
9617                 ip6_out->ip6_hlim = ip6_defhlim;
9618                 ip6_out->ip6_nxt = IPPROTO_SCTP;
9619                 ip6_out->ip6_src = ip6->ip6_dst;
9620                 ip6_out->ip6_dst = ip6->ip6_src;
9621                 /*
9622                  * ?? The old code had both the iph len + payload, I think
9623                  * this is wrong and would never have worked
9624                  */
9625                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
9626                 offset_out += sizeof(*ip6_out);
9627                 comp_cp = (struct sctp_shutdown_complete_msg *)(
9628                     (caddr_t)ip6_out + offset_out);
9629         } else {
9630                 /* Currently not supported. */
9631                 return;
9632         }
9633         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
9634                 /* no mbuf's */
9635                 sctp_m_freem(mout);
9636                 return;
9637         }
9638         /* Now copy in and fill in the ABORT tags etc. */
9639         comp_cp->sh.src_port = sh->dest_port;
9640         comp_cp->sh.dest_port = sh->src_port;
9641         comp_cp->sh.checksum = 0;
9642         comp_cp->sh.v_tag = sh->v_tag;
9643         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
9644         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
9645         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
9646
9647         /* add checksum */
9648         comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
9649         if (iph_out != NULL) {
9650                 sctp_route_t ro;
9651                 int ret;
9652                 struct sctp_tcb *stcb = NULL;
9653
9654                 mlen = SCTP_BUF_LEN(mout);
9655                 bzero(&ro, sizeof ro);
9656                 /* set IPv4 length */
9657                 iph_out->ip_len = mlen;
9658 #ifdef  SCTP_PACKET_LOGGING
9659                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
9660                         sctp_packet_log(mout, mlen);
9661 #endif
9662                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
9663
9664                 /* out it goes */
9665                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
9666
9667                 /* Free the route if we got one back */
9668                 if (ro.ro_rt)
9669                         RTFREE(ro.ro_rt);
9670         } else if (ip6_out != NULL) {
9671                 struct route_in6 ro;
9672                 int ret;
9673                 struct sctp_tcb *stcb = NULL;
9674                 struct ifnet *ifp = NULL;
9675
9676                 bzero(&ro, sizeof(ro));
9677                 mlen = SCTP_BUF_LEN(mout);
9678 #ifdef  SCTP_PACKET_LOGGING
9679                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
9680                         sctp_packet_log(mout, mlen);
9681 #endif
9682                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
9683                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
9684
9685                 /* Free the route if we got one back */
9686                 if (ro.ro_rt)
9687                         RTFREE(ro.ro_rt);
9688         }
9689         SCTP_STAT_INCR(sctps_sendpackets);
9690         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
9691         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9692         return;
9693
9694 }
9695
9696 static struct sctp_nets *
9697 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
9698 {
9699         struct sctp_nets *net, *hnet;
9700         int ms_goneby, highest_ms, state_overide = 0;
9701
9702         (void)SCTP_GETTIME_TIMEVAL(now);
9703         highest_ms = 0;
9704         hnet = NULL;
9705         SCTP_TCB_LOCK_ASSERT(stcb);
9706         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
9707                 if (
9708                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
9709                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
9710                     ) {
9711                         /*
9712                          * Skip this guy from consideration if HB is off AND
9713                          * its confirmed
9714                          */
9715                         continue;
9716                 }
9717                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
9718                         /* skip this dest net from consideration */
9719                         continue;
9720                 }
9721                 if (net->last_sent_time.tv_sec) {
9722                         /* Sent to so we subtract */
9723                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
9724                 } else
9725                         /* Never been sent to */
9726                         ms_goneby = 0x7fffffff;
9727                 /*-
9728                  * When the address state is unconfirmed but still
9729                  * considered reachable, we HB at a higher rate. Once it
9730                  * goes confirmed OR reaches the "unreachable" state, thenw
9731                  * we cut it back to HB at a more normal pace.
9732                  */
9733                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
9734                         state_overide = 1;
9735                 } else {
9736                         state_overide = 0;
9737                 }
9738
9739                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
9740                     (ms_goneby > highest_ms)) {
9741                         highest_ms = ms_goneby;
9742                         hnet = net;
9743                 }
9744         }
9745         if (hnet &&
9746             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
9747                 state_overide = 1;
9748         } else {
9749                 state_overide = 0;
9750         }
9751
9752         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
9753                 /*-
9754                  * Found the one with longest delay bounds OR it is
9755                  * unconfirmed and still not marked unreachable.
9756                  */
9757                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
9758 #ifdef SCTP_DEBUG
9759                 if (hnet) {
9760                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
9761                             (struct sockaddr *)&hnet->ro._l_addr);
9762                 } else {
9763                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
9764                 }
9765 #endif
9766                 /* update the timer now */
9767                 hnet->last_sent_time = *now;
9768                 return (hnet);
9769         }
9770         /* Nothing to HB */
9771         return (NULL);
9772 }
9773
9774 int
9775 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
9776 {
9777         struct sctp_tmit_chunk *chk;
9778         struct sctp_nets *net;
9779         struct sctp_heartbeat_chunk *hb;
9780         struct timeval now;
9781         struct sockaddr_in *sin;
9782         struct sockaddr_in6 *sin6;
9783
9784         SCTP_TCB_LOCK_ASSERT(stcb);
9785         if (user_req == 0) {
9786                 net = sctp_select_hb_destination(stcb, &now);
9787                 if (net == NULL) {
9788                         /*-
9789                          * All our busy none to send to, just start the
9790                          * timer again.
9791                          */
9792                         if (stcb->asoc.state == 0) {
9793                                 return (0);
9794                         }
9795                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
9796                             stcb->sctp_ep,
9797                             stcb,
9798                             net);
9799                         return (0);
9800                 }
9801         } else {
9802                 net = u_net;
9803                 if (net == NULL) {
9804                         return (0);
9805                 }
9806                 (void)SCTP_GETTIME_TIMEVAL(&now);
9807         }
9808         sin = (struct sockaddr_in *)&net->ro._l_addr;
9809         if (sin->sin_family != AF_INET) {
9810                 if (sin->sin_family != AF_INET6) {
9811                         /* huh */
9812                         return (0);
9813                 }
9814         }
9815         sctp_alloc_a_chunk(stcb, chk);
9816         if (chk == NULL) {
9817                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
9818                 return (0);
9819         }
9820         chk->copy_by_ref = 0;
9821         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
9822         chk->rec.chunk_id.can_take_data = 1;
9823         chk->asoc = &stcb->asoc;
9824         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
9825
9826         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
9827         if (chk->data == NULL) {
9828                 sctp_free_a_chunk(stcb, chk);
9829                 return (0);
9830         }
9831         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9832         SCTP_BUF_LEN(chk->data) = chk->send_size;
9833         chk->sent = SCTP_DATAGRAM_UNSENT;
9834         chk->snd_count = 0;
9835         chk->whoTo = net;
9836         atomic_add_int(&chk->whoTo->ref_count, 1);
9837         /* Now we have a mbuf that we can fill in with the details */
9838         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
9839         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
9840         /* fill out chunk header */
9841         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
9842         hb->ch.chunk_flags = 0;
9843         hb->ch.chunk_length = htons(chk->send_size);
9844         /* Fill out hb parameter */
9845         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
9846         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
9847         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
9848         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
9849         /* Did our user request this one, put it in */
9850         hb->heartbeat.hb_info.user_req = user_req;
9851         hb->heartbeat.hb_info.addr_family = sin->sin_family;
9852         hb->heartbeat.hb_info.addr_len = sin->sin_len;
9853         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
9854                 /*
9855                  * we only take from the entropy pool if the address is not
9856                  * confirmed.
9857                  */
9858                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
9859                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
9860         } else {
9861                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
9862                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
9863         }
9864         if (sin->sin_family == AF_INET) {
9865                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
9866         } else if (sin->sin_family == AF_INET6) {
9867                 /* We leave the scope the way it is in our lookup table. */
9868                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
9869                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
9870         } else {
9871                 /* huh compiler bug */
9872                 return (0);
9873         }
9874
9875         /*
9876          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
9877          * PF-heartbeats.  Because of this, threshold management is done by
9878          * the t3 timer handler, and does not need to be done upon the send
9879          * of a PF-heartbeat. If CMT PF is on and the destination to which a
9880          * heartbeat is being sent is in PF state, do NOT do threshold
9881          * management.
9882          */
9883         if ((sctp_cmt_pf == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
9884                 /* ok we have a destination that needs a beat */
9885                 /* lets do the theshold management Qiaobing style */
9886                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
9887                     stcb->asoc.max_send_times)) {
9888                         /*-
9889                          * we have lost the association, in a way this is
9890                          * quite bad since we really are one less time since
9891                          * we really did not send yet. This is the down side
9892                          * to the Q's style as defined in the RFC and not my
9893                          * alternate style defined in the RFC.
9894                          */
9895                         if (chk->data != NULL) {
9896                                 sctp_m_freem(chk->data);
9897                                 chk->data = NULL;
9898                         }
9899                         /*
9900                          * Here we do NOT use the macro since the
9901                          * association is now gone.
9902                          */
9903                         if (chk->whoTo) {
9904                                 sctp_free_remote_addr(chk->whoTo);
9905                                 chk->whoTo = NULL;
9906                         }
9907                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
9908                         return (-1);
9909                 }
9910         }
9911         net->hb_responded = 0;
9912         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9913         stcb->asoc.ctrl_queue_cnt++;
9914         SCTP_STAT_INCR(sctps_sendheartbeat);
9915         /*-
9916          * Call directly med level routine to put out the chunk. It will
9917          * always tumble out control chunks aka HB but it may even tumble
9918          * out data too.
9919          */
9920         return (1);
9921 }
9922
9923 void
9924 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
9925     uint32_t high_tsn)
9926 {
9927         struct sctp_association *asoc;
9928         struct sctp_ecne_chunk *ecne;
9929         struct sctp_tmit_chunk *chk;
9930
9931         asoc = &stcb->asoc;
9932         SCTP_TCB_LOCK_ASSERT(stcb);
9933         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9934                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
9935                         /* found a previous ECN_ECHO update it if needed */
9936                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
9937                         ecne->tsn = htonl(high_tsn);
9938                         return;
9939                 }
9940         }
9941         /* nope could not find one to update so we must build one */
9942         sctp_alloc_a_chunk(stcb, chk);
9943         if (chk == NULL) {
9944                 return;
9945         }
9946         chk->copy_by_ref = 0;
9947         SCTP_STAT_INCR(sctps_sendecne);
9948         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
9949         chk->rec.chunk_id.can_take_data = 0;
9950         chk->asoc = &stcb->asoc;
9951         chk->send_size = sizeof(struct sctp_ecne_chunk);
9952         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
9953         if (chk->data == NULL) {
9954                 sctp_free_a_chunk(stcb, chk);
9955                 return;
9956         }
9957         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9958         SCTP_BUF_LEN(chk->data) = chk->send_size;
9959         chk->sent = SCTP_DATAGRAM_UNSENT;
9960         chk->snd_count = 0;
9961         chk->whoTo = net;
9962         atomic_add_int(&chk->whoTo->ref_count, 1);
9963         stcb->asoc.ecn_echo_cnt_onq++;
9964         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
9965         ecne->ch.chunk_type = SCTP_ECN_ECHO;
9966         ecne->ch.chunk_flags = 0;
9967         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
9968         ecne->tsn = htonl(high_tsn);
9969         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9970         asoc->ctrl_queue_cnt++;
9971 }
9972
9973 void
9974 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
9975     struct mbuf *m, int iphlen, int bad_crc)
9976 {
9977         struct sctp_association *asoc;
9978         struct sctp_pktdrop_chunk *drp;
9979         struct sctp_tmit_chunk *chk;
9980         uint8_t *datap;
9981         int len;
9982         int was_trunc = 0;
9983         struct ip *iph;
9984         int fullsz = 0, extra = 0;
9985         long spc;
9986         int offset;
9987         struct sctp_chunkhdr *ch, chunk_buf;
9988         unsigned int chk_length;
9989
9990         if (!stcb) {
9991                 return;
9992         }
9993         asoc = &stcb->asoc;
9994         SCTP_TCB_LOCK_ASSERT(stcb);
9995         if (asoc->peer_supports_pktdrop == 0) {
9996                 /*-
9997                  * peer must declare support before I send one.
9998                  */
9999                 return;
10000         }
10001         if (stcb->sctp_socket == NULL) {
10002                 return;
10003         }
10004         sctp_alloc_a_chunk(stcb, chk);
10005         if (chk == NULL) {
10006                 return;
10007         }
10008         chk->copy_by_ref = 0;
10009         iph = mtod(m, struct ip *);
10010         if (iph == NULL) {
10011                 sctp_free_a_chunk(stcb, chk);
10012                 return;
10013         }
10014         if (iph->ip_v == IPVERSION) {
10015                 /* IPv4 */
10016                 len = chk->send_size = iph->ip_len;
10017         } else {
10018                 struct ip6_hdr *ip6h;
10019
10020                 /* IPv6 */
10021                 ip6h = mtod(m, struct ip6_hdr *);
10022                 len = chk->send_size = htons(ip6h->ip6_plen);
10023         }
10024         /* Validate that we do not have an ABORT in here. */
10025         offset = iphlen + sizeof(struct sctphdr);
10026         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10027             sizeof(*ch), (uint8_t *) & chunk_buf);
10028         while (ch != NULL) {
10029                 chk_length = ntohs(ch->chunk_length);
10030                 if (chk_length < sizeof(*ch)) {
10031                         /* break to abort land */
10032                         break;
10033                 }
10034                 switch (ch->chunk_type) {
10035                 case SCTP_PACKET_DROPPED:
10036                 case SCTP_ABORT_ASSOCIATION:
10037                         /*-
10038                          * we don't respond with an PKT-DROP to an ABORT
10039                          * or PKT-DROP
10040                          */
10041                         sctp_free_a_chunk(stcb, chk);
10042                         return;
10043                 default:
10044                         break;
10045                 }
10046                 offset += SCTP_SIZE32(chk_length);
10047                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10048                     sizeof(*ch), (uint8_t *) & chunk_buf);
10049         }
10050
10051         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10052             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10053                 /*
10054                  * only send 1 mtu worth, trim off the excess on the end.
10055                  */
10056                 fullsz = len - extra;
10057                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10058                 was_trunc = 1;
10059         }
10060         chk->asoc = &stcb->asoc;
10061         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10062         if (chk->data == NULL) {
10063 jump_out:
10064                 sctp_free_a_chunk(stcb, chk);
10065                 return;
10066         }
10067         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10068         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10069         if (drp == NULL) {
10070                 sctp_m_freem(chk->data);
10071                 chk->data = NULL;
10072                 goto jump_out;
10073         }
10074         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10075             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10076         chk->book_size_scale = 0;
10077         if (was_trunc) {
10078                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
10079                 drp->trunc_len = htons(fullsz);
10080                 /*
10081                  * Len is already adjusted to size minus overhead above take
10082                  * out the pkt_drop chunk itself from it.
10083                  */
10084                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
10085                 len = chk->send_size;
10086         } else {
10087                 /* no truncation needed */
10088                 drp->ch.chunk_flags = 0;
10089                 drp->trunc_len = htons(0);
10090         }
10091         if (bad_crc) {
10092                 drp->ch.chunk_flags |= SCTP_BADCRC;
10093         }
10094         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
10095         SCTP_BUF_LEN(chk->data) = chk->send_size;
10096         chk->sent = SCTP_DATAGRAM_UNSENT;
10097         chk->snd_count = 0;
10098         if (net) {
10099                 /* we should hit here */
10100                 chk->whoTo = net;
10101         } else {
10102                 chk->whoTo = asoc->primary_destination;
10103         }
10104         atomic_add_int(&chk->whoTo->ref_count, 1);
10105         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
10106         chk->rec.chunk_id.can_take_data = 1;
10107         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
10108         drp->ch.chunk_length = htons(chk->send_size);
10109         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
10110         if (spc < 0) {
10111                 spc = 0;
10112         }
10113         drp->bottle_bw = htonl(spc);
10114         if (asoc->my_rwnd) {
10115                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
10116                     asoc->size_on_all_streams +
10117                     asoc->my_rwnd_control_len +
10118                     stcb->sctp_socket->so_rcv.sb_cc);
10119         } else {
10120                 /*-
10121                  * If my rwnd is 0, possibly from mbuf depletion as well as
10122                  * space used, tell the peer there is NO space aka onq == bw
10123                  */
10124                 drp->current_onq = htonl(spc);
10125         }
10126         drp->reserved = 0;
10127         datap = drp->data;
10128         m_copydata(m, iphlen, len, (caddr_t)datap);
10129         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10130         asoc->ctrl_queue_cnt++;
10131 }
10132
10133 void
10134 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
10135 {
10136         struct sctp_association *asoc;
10137         struct sctp_cwr_chunk *cwr;
10138         struct sctp_tmit_chunk *chk;
10139
10140         asoc = &stcb->asoc;
10141         SCTP_TCB_LOCK_ASSERT(stcb);
10142         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10143                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
10144                         /* found a previous ECN_CWR update it if needed */
10145                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10146                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
10147                             MAX_TSN)) {
10148                                 cwr->tsn = htonl(high_tsn);
10149                         }
10150                         return;
10151                 }
10152         }
10153         /* nope could not find one to update so we must build one */
10154         sctp_alloc_a_chunk(stcb, chk);
10155         if (chk == NULL) {
10156                 return;
10157         }
10158         chk->copy_by_ref = 0;
10159         chk->rec.chunk_id.id = SCTP_ECN_CWR;
10160         chk->rec.chunk_id.can_take_data = 1;
10161         chk->asoc = &stcb->asoc;
10162         chk->send_size = sizeof(struct sctp_cwr_chunk);
10163         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10164         if (chk->data == NULL) {
10165                 sctp_free_a_chunk(stcb, chk);
10166                 return;
10167         }
10168         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10169         SCTP_BUF_LEN(chk->data) = chk->send_size;
10170         chk->sent = SCTP_DATAGRAM_UNSENT;
10171         chk->snd_count = 0;
10172         chk->whoTo = net;
10173         atomic_add_int(&chk->whoTo->ref_count, 1);
10174         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10175         cwr->ch.chunk_type = SCTP_ECN_CWR;
10176         cwr->ch.chunk_flags = 0;
10177         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
10178         cwr->tsn = htonl(high_tsn);
10179         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10180         asoc->ctrl_queue_cnt++;
10181 }
10182
10183 void
10184 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
10185     int number_entries, uint16_t * list,
10186     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
10187 {
10188         int len, old_len, i;
10189         struct sctp_stream_reset_out_request *req_out;
10190         struct sctp_chunkhdr *ch;
10191
10192         ch = mtod(chk->data, struct sctp_chunkhdr *);
10193
10194
10195         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10196
10197         /* get to new offset for the param. */
10198         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
10199         /* now how long will this param be? */
10200         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
10201         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
10202         req_out->ph.param_length = htons(len);
10203         req_out->request_seq = htonl(seq);
10204         req_out->response_seq = htonl(resp_seq);
10205         req_out->send_reset_at_tsn = htonl(last_sent);
10206         if (number_entries) {
10207                 for (i = 0; i < number_entries; i++) {
10208                         req_out->list_of_streams[i] = htons(list[i]);
10209                 }
10210         }
10211         if (SCTP_SIZE32(len) > len) {
10212                 /*-
10213                  * Need to worry about the pad we may end up adding to the
10214                  * end. This is easy since the struct is either aligned to 4
10215                  * bytes or 2 bytes off.
10216                  */
10217                 req_out->list_of_streams[number_entries] = 0;
10218         }
10219         /* now fix the chunk length */
10220         ch->chunk_length = htons(len + old_len);
10221         chk->book_size = len + old_len;
10222         chk->book_size_scale = 0;
10223         chk->send_size = SCTP_SIZE32(chk->book_size);
10224         SCTP_BUF_LEN(chk->data) = chk->send_size;
10225         return;
10226 }
10227
10228
10229 void
10230 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
10231     int number_entries, uint16_t * list,
10232     uint32_t seq)
10233 {
10234         int len, old_len, i;
10235         struct sctp_stream_reset_in_request *req_in;
10236         struct sctp_chunkhdr *ch;
10237
10238         ch = mtod(chk->data, struct sctp_chunkhdr *);
10239
10240
10241         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10242
10243         /* get to new offset for the param. */
10244         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
10245         /* now how long will this param be? */
10246         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
10247         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
10248         req_in->ph.param_length = htons(len);
10249         req_in->request_seq = htonl(seq);
10250         if (number_entries) {
10251                 for (i = 0; i < number_entries; i++) {
10252                         req_in->list_of_streams[i] = htons(list[i]);
10253                 }
10254         }
10255         if (SCTP_SIZE32(len) > len) {
10256                 /*-
10257                  * Need to worry about the pad we may end up adding to the
10258                  * end. This is easy since the struct is either aligned to 4
10259                  * bytes or 2 bytes off.
10260                  */
10261                 req_in->list_of_streams[number_entries] = 0;
10262         }
10263         /* now fix the chunk length */
10264         ch->chunk_length = htons(len + old_len);
10265         chk->book_size = len + old_len;
10266         chk->book_size_scale = 0;
10267         chk->send_size = SCTP_SIZE32(chk->book_size);
10268         SCTP_BUF_LEN(chk->data) = chk->send_size;
10269         return;
10270 }
10271
10272
10273 void
10274 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
10275     uint32_t seq)
10276 {
10277         int len, old_len;
10278         struct sctp_stream_reset_tsn_request *req_tsn;
10279         struct sctp_chunkhdr *ch;
10280
10281         ch = mtod(chk->data, struct sctp_chunkhdr *);
10282
10283
10284         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10285
10286         /* get to new offset for the param. */
10287         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
10288         /* now how long will this param be? */
10289         len = sizeof(struct sctp_stream_reset_tsn_request);
10290         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
10291         req_tsn->ph.param_length = htons(len);
10292         req_tsn->request_seq = htonl(seq);
10293
10294         /* now fix the chunk length */
10295         ch->chunk_length = htons(len + old_len);
10296         chk->send_size = len + old_len;
10297         chk->book_size = SCTP_SIZE32(chk->send_size);
10298         chk->book_size_scale = 0;
10299         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
10300         return;
10301 }
10302
10303 void
10304 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
10305     uint32_t resp_seq, uint32_t result)
10306 {
10307         int len, old_len;
10308         struct sctp_stream_reset_response *resp;
10309         struct sctp_chunkhdr *ch;
10310
10311         ch = mtod(chk->data, struct sctp_chunkhdr *);
10312
10313
10314         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10315
10316         /* get to new offset for the param. */
10317         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
10318         /* now how long will this param be? */
10319         len = sizeof(struct sctp_stream_reset_response);
10320         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
10321         resp->ph.param_length = htons(len);
10322         resp->response_seq = htonl(resp_seq);
10323         resp->result = ntohl(result);
10324
10325         /* now fix the chunk length */
10326         ch->chunk_length = htons(len + old_len);
10327         chk->book_size = len + old_len;
10328         chk->book_size_scale = 0;
10329         chk->send_size = SCTP_SIZE32(chk->book_size);
10330         SCTP_BUF_LEN(chk->data) = chk->send_size;
10331         return;
10332
10333 }
10334
10335
10336 void
10337 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
10338     uint32_t resp_seq, uint32_t result,
10339     uint32_t send_una, uint32_t recv_next)
10340 {
10341         int len, old_len;
10342         struct sctp_stream_reset_response_tsn *resp;
10343         struct sctp_chunkhdr *ch;
10344
10345         ch = mtod(chk->data, struct sctp_chunkhdr *);
10346
10347
10348         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10349
10350         /* get to new offset for the param. */
10351         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
10352         /* now how long will this param be? */
10353         len = sizeof(struct sctp_stream_reset_response_tsn);
10354         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
10355         resp->ph.param_length = htons(len);
10356         resp->response_seq = htonl(resp_seq);
10357         resp->result = htonl(result);
10358         resp->senders_next_tsn = htonl(send_una);
10359         resp->receivers_next_tsn = htonl(recv_next);
10360
10361         /* now fix the chunk length */
10362         ch->chunk_length = htons(len + old_len);
10363         chk->book_size = len + old_len;
10364         chk->send_size = SCTP_SIZE32(chk->book_size);
10365         chk->book_size_scale = 0;
10366         SCTP_BUF_LEN(chk->data) = chk->send_size;
10367         return;
10368 }
10369
10370
10371 int
10372 sctp_send_str_reset_req(struct sctp_tcb *stcb,
10373     int number_entries, uint16_t * list,
10374     uint8_t send_out_req, uint32_t resp_seq,
10375     uint8_t send_in_req,
10376     uint8_t send_tsn_req)
10377 {
10378
10379         struct sctp_association *asoc;
10380         struct sctp_tmit_chunk *chk;
10381         struct sctp_chunkhdr *ch;
10382         uint32_t seq;
10383
10384         asoc = &stcb->asoc;
10385         if (asoc->stream_reset_outstanding) {
10386                 /*-
10387                  * Already one pending, must get ACK back to clear the flag.
10388                  */
10389                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
10390                 return (EBUSY);
10391         }
10392         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
10393                 /* nothing to do */
10394                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10395                 return (EINVAL);
10396         }
10397         if (send_tsn_req && (send_out_req || send_in_req)) {
10398                 /* error, can't do that */
10399                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10400                 return (EINVAL);
10401         }
10402         sctp_alloc_a_chunk(stcb, chk);
10403         if (chk == NULL) {
10404                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10405                 return (ENOMEM);
10406         }
10407         chk->copy_by_ref = 0;
10408         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
10409         chk->rec.chunk_id.can_take_data = 0;
10410         chk->asoc = &stcb->asoc;
10411         chk->book_size = sizeof(struct sctp_chunkhdr);
10412         chk->send_size = SCTP_SIZE32(chk->book_size);
10413         chk->book_size_scale = 0;
10414
10415         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10416         if (chk->data == NULL) {
10417                 sctp_free_a_chunk(stcb, chk);
10418                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10419                 return (ENOMEM);
10420         }
10421         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10422
10423         /* setup chunk parameters */
10424         chk->sent = SCTP_DATAGRAM_UNSENT;
10425         chk->snd_count = 0;
10426         chk->whoTo = asoc->primary_destination;
10427         atomic_add_int(&chk->whoTo->ref_count, 1);
10428
10429         ch = mtod(chk->data, struct sctp_chunkhdr *);
10430         ch->chunk_type = SCTP_STREAM_RESET;
10431         ch->chunk_flags = 0;
10432         ch->chunk_length = htons(chk->book_size);
10433         SCTP_BUF_LEN(chk->data) = chk->send_size;
10434
10435         seq = stcb->asoc.str_reset_seq_out;
10436         if (send_out_req) {
10437                 sctp_add_stream_reset_out(chk, number_entries, list,
10438                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
10439                 asoc->stream_reset_out_is_outstanding = 1;
10440                 seq++;
10441                 asoc->stream_reset_outstanding++;
10442         }
10443         if (send_in_req) {
10444                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
10445                 asoc->stream_reset_outstanding++;
10446         }
10447         if (send_tsn_req) {
10448                 sctp_add_stream_reset_tsn(chk, seq);
10449                 asoc->stream_reset_outstanding++;
10450         }
10451         asoc->str_reset = chk;
10452
10453         /* insert the chunk for sending */
10454         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
10455             chk,
10456             sctp_next);
10457         asoc->ctrl_queue_cnt++;
10458         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
10459         return (0);
10460 }
10461
10462 void
10463 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
10464     struct mbuf *err_cause, uint32_t vrf_id)
10465 {
10466         /*-
10467          * Formulate the abort message, and send it back down.
10468          */
10469         struct mbuf *o_pak;
10470         struct mbuf *mout;
10471         struct sctp_abort_msg *abm;
10472         struct ip *iph, *iph_out;
10473         struct ip6_hdr *ip6, *ip6_out;
10474         int iphlen_out, len;
10475
10476         /* don't respond to ABORT with ABORT */
10477         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
10478                 if (err_cause)
10479                         sctp_m_freem(err_cause);
10480                 return;
10481         }
10482         len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
10483
10484         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
10485         if (mout == NULL) {
10486                 if (err_cause)
10487                         sctp_m_freem(err_cause);
10488                 return;
10489         }
10490         iph = mtod(m, struct ip *);
10491         iph_out = NULL;
10492         ip6_out = NULL;
10493         if (iph->ip_v == IPVERSION) {
10494                 iph_out = mtod(mout, struct ip *);
10495                 SCTP_BUF_LEN(mout) = sizeof(*iph_out) + sizeof(*abm);
10496                 SCTP_BUF_NEXT(mout) = err_cause;
10497
10498                 /* Fill in the IP header for the ABORT */
10499                 iph_out->ip_v = IPVERSION;
10500                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10501                 iph_out->ip_tos = (u_char)0;
10502                 iph_out->ip_id = 0;
10503                 iph_out->ip_off = 0;
10504                 iph_out->ip_ttl = MAXTTL;
10505                 iph_out->ip_p = IPPROTO_SCTP;
10506                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10507                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10508                 /* let IP layer calculate this */
10509                 iph_out->ip_sum = 0;
10510
10511                 iphlen_out = sizeof(*iph_out);
10512                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
10513         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
10514                 ip6 = (struct ip6_hdr *)iph;
10515                 ip6_out = mtod(mout, struct ip6_hdr *);
10516                 SCTP_BUF_LEN(mout) = sizeof(*ip6_out) + sizeof(*abm);
10517                 SCTP_BUF_NEXT(mout) = err_cause;
10518
10519                 /* Fill in the IP6 header for the ABORT */
10520                 ip6_out->ip6_flow = ip6->ip6_flow;
10521                 ip6_out->ip6_hlim = ip6_defhlim;
10522                 ip6_out->ip6_nxt = IPPROTO_SCTP;
10523                 ip6_out->ip6_src = ip6->ip6_dst;
10524                 ip6_out->ip6_dst = ip6->ip6_src;
10525
10526                 iphlen_out = sizeof(*ip6_out);
10527                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
10528         } else {
10529                 /* Currently not supported */
10530                 if (err_cause)
10531                         sctp_m_freem(err_cause);
10532                 sctp_m_freem(mout);
10533                 return;
10534         }
10535
10536         abm->sh.src_port = sh->dest_port;
10537         abm->sh.dest_port = sh->src_port;
10538         abm->sh.checksum = 0;
10539         if (vtag == 0) {
10540                 abm->sh.v_tag = sh->v_tag;
10541                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
10542         } else {
10543                 abm->sh.v_tag = htonl(vtag);
10544                 abm->msg.ch.chunk_flags = 0;
10545         }
10546         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10547
10548         if (err_cause) {
10549                 struct mbuf *m_tmp = err_cause;
10550                 int err_len = 0;
10551
10552                 /* get length of the err_cause chain */
10553                 while (m_tmp != NULL) {
10554                         err_len += SCTP_BUF_LEN(m_tmp);
10555                         m_tmp = SCTP_BUF_NEXT(m_tmp);
10556                 }
10557                 len = SCTP_BUF_LEN(mout) + err_len;
10558                 if (err_len % 4) {
10559                         /* need pad at end of chunk */
10560                         uint32_t cpthis = 0;
10561                         int padlen;
10562
10563                         padlen = 4 - (len % 4);
10564                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
10565                         len += padlen;
10566                 }
10567                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
10568         } else {
10569                 len = SCTP_BUF_LEN(mout);
10570                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
10571         }
10572
10573         /* add checksum */
10574         abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
10575         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10576                 /* no mbuf's */
10577                 sctp_m_freem(mout);
10578                 return;
10579         }
10580         if (iph_out != NULL) {
10581                 sctp_route_t ro;
10582                 struct sctp_tcb *stcb = NULL;
10583                 int ret;
10584
10585                 /* zap the stack pointer to the route */
10586                 bzero(&ro, sizeof ro);
10587                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
10588                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
10589                 /* set IPv4 length */
10590                 iph_out->ip_len = len;
10591                 /* out it goes */
10592 #ifdef  SCTP_PACKET_LOGGING
10593                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10594                         sctp_packet_log(mout, len);
10595 #endif
10596                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10597                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10598
10599                 /* Free the route if we got one back */
10600                 if (ro.ro_rt)
10601                         RTFREE(ro.ro_rt);
10602         } else if (ip6_out != NULL) {
10603                 struct route_in6 ro;
10604                 int ret;
10605                 struct sctp_tcb *stcb = NULL;
10606                 struct ifnet *ifp = NULL;
10607
10608                 /* zap the stack pointer to the route */
10609                 bzero(&ro, sizeof(ro));
10610                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
10611                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
10612                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
10613 #ifdef  SCTP_PACKET_LOGGING
10614                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10615                         sctp_packet_log(mout, len);
10616 #endif
10617                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10618                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10619
10620                 /* Free the route if we got one back */
10621                 if (ro.ro_rt)
10622                         RTFREE(ro.ro_rt);
10623         }
10624         SCTP_STAT_INCR(sctps_sendpackets);
10625         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10626 }
10627
10628 void
10629 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
10630     uint32_t vrf_id)
10631 {
10632         struct mbuf *o_pak;
10633         struct sctphdr *ihdr;
10634         int retcode;
10635         struct sctphdr *ohdr;
10636         struct sctp_chunkhdr *ophdr;
10637         struct ip *iph;
10638         struct mbuf *mout;
10639
10640 #ifdef SCTP_DEBUG
10641         struct sockaddr_in6 lsa6, fsa6;
10642
10643 #endif
10644         uint32_t val;
10645         struct mbuf *at;
10646         int len;
10647
10648         iph = mtod(m, struct ip *);
10649         ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
10650
10651         SCTP_BUF_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
10652         if (scm == NULL) {
10653                 /* can't send because we can't add a mbuf */
10654                 return;
10655         }
10656         ohdr = mtod(scm, struct sctphdr *);
10657         ohdr->src_port = ihdr->dest_port;
10658         ohdr->dest_port = ihdr->src_port;
10659         ohdr->v_tag = vtag;
10660         ohdr->checksum = 0;
10661         ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
10662         ophdr->chunk_type = SCTP_OPERATION_ERROR;
10663         ophdr->chunk_flags = 0;
10664         len = 0;
10665         at = scm;
10666         while (at) {
10667                 len += SCTP_BUF_LEN(at);
10668                 at = SCTP_BUF_NEXT(at);
10669         }
10670         ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
10671         if (len % 4) {
10672                 /* need padding */
10673                 uint32_t cpthis = 0;
10674                 int padlen;
10675
10676                 padlen = 4 - (len % 4);
10677                 m_copyback(scm, len, padlen, (caddr_t)&cpthis);
10678                 len += padlen;
10679         }
10680         val = sctp_calculate_sum(scm, NULL, 0);
10681         mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
10682         if (mout == NULL) {
10683                 sctp_m_freem(scm);
10684                 return;
10685         }
10686         SCTP_BUF_NEXT(mout) = scm;
10687         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10688                 sctp_m_freem(mout);
10689                 return;
10690         }
10691         ohdr->checksum = val;
10692         if (iph->ip_v == IPVERSION) {
10693                 /* V4 */
10694                 struct ip *out;
10695                 sctp_route_t ro;
10696                 struct sctp_tcb *stcb = NULL;
10697
10698                 SCTP_BUF_LEN(mout) = sizeof(struct ip);
10699                 len += sizeof(struct ip);
10700
10701                 bzero(&ro, sizeof ro);
10702                 out = mtod(mout, struct ip *);
10703                 out->ip_v = iph->ip_v;
10704                 out->ip_hl = (sizeof(struct ip) / 4);
10705                 out->ip_tos = iph->ip_tos;
10706                 out->ip_id = iph->ip_id;
10707                 out->ip_off = 0;
10708                 out->ip_ttl = MAXTTL;
10709                 out->ip_p = IPPROTO_SCTP;
10710                 out->ip_sum = 0;
10711                 out->ip_src = iph->ip_dst;
10712                 out->ip_dst = iph->ip_src;
10713                 out->ip_len = len;
10714 #ifdef  SCTP_PACKET_LOGGING
10715                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10716                         sctp_packet_log(mout, len);
10717 #endif
10718                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10719
10720                 SCTP_IP_OUTPUT(retcode, o_pak, &ro, stcb, vrf_id);
10721
10722                 SCTP_STAT_INCR(sctps_sendpackets);
10723                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10724                 /* Free the route if we got one back */
10725                 if (ro.ro_rt)
10726                         RTFREE(ro.ro_rt);
10727         } else {
10728                 /* V6 */
10729                 struct route_in6 ro;
10730                 int ret;
10731                 struct sctp_tcb *stcb = NULL;
10732                 struct ifnet *ifp = NULL;
10733                 struct ip6_hdr *out6, *in6;
10734
10735                 SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr);
10736                 len += sizeof(struct ip6_hdr);
10737                 bzero(&ro, sizeof ro);
10738                 in6 = mtod(m, struct ip6_hdr *);
10739                 out6 = mtod(mout, struct ip6_hdr *);
10740                 out6->ip6_flow = in6->ip6_flow;
10741                 out6->ip6_hlim = ip6_defhlim;
10742                 out6->ip6_nxt = IPPROTO_SCTP;
10743                 out6->ip6_src = in6->ip6_dst;
10744                 out6->ip6_dst = in6->ip6_src;
10745                 out6->ip6_plen = len - sizeof(struct ip6_hdr);
10746
10747 #ifdef SCTP_DEBUG
10748                 bzero(&lsa6, sizeof(lsa6));
10749                 lsa6.sin6_len = sizeof(lsa6);
10750                 lsa6.sin6_family = AF_INET6;
10751                 lsa6.sin6_addr = out6->ip6_src;
10752                 bzero(&fsa6, sizeof(fsa6));
10753                 fsa6.sin6_len = sizeof(fsa6);
10754                 fsa6.sin6_family = AF_INET6;
10755                 fsa6.sin6_addr = out6->ip6_dst;
10756 #endif
10757                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_operr_to calling ipv6 output:\n");
10758                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "src: ");
10759                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&lsa6);
10760                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "dst ");
10761                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&fsa6);
10762
10763 #ifdef  SCTP_PACKET_LOGGING
10764                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10765                         sctp_packet_log(mout, len);
10766 #endif
10767                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10768                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10769
10770                 SCTP_STAT_INCR(sctps_sendpackets);
10771                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10772                 /* Free the route if we got one back */
10773                 if (ro.ro_rt)
10774                         RTFREE(ro.ro_rt);
10775         }
10776 }
10777
10778 static struct mbuf *
10779 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
10780     struct uio *uio,
10781     struct sctp_sndrcvinfo *srcv,
10782     int max_send_len,
10783     int user_marks_eor,
10784     int *error,
10785     uint32_t * sndout,
10786     struct mbuf **new_tail)
10787 {
10788         struct mbuf *m;
10789
10790         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
10791             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
10792         if (m == NULL) {
10793                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10794                 *error = ENOMEM;
10795         } else {
10796                 *sndout = m_length(m, NULL);
10797                 *new_tail = m_last(m);
10798         }
10799         return (m);
10800 }
10801
10802 static int
10803 sctp_copy_one(struct sctp_stream_queue_pending *sp,
10804     struct uio *uio,
10805     int resv_upfront)
10806 {
10807         int left;
10808
10809         left = sp->length;
10810         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
10811             resv_upfront, 0);
10812         if (sp->data == NULL) {
10813                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10814                 return (ENOMEM);
10815         }
10816         sp->tail_mbuf = m_last(sp->data);
10817         return (0);
10818 }
10819
10820
10821
10822 static struct sctp_stream_queue_pending *
10823 sctp_copy_it_in(struct sctp_tcb *stcb,
10824     struct sctp_association *asoc,
10825     struct sctp_sndrcvinfo *srcv,
10826     struct uio *uio,
10827     struct sctp_nets *net,
10828     int max_send_len,
10829     int user_marks_eor,
10830     int *error,
10831     int non_blocking)
10832 {
10833         /*-
10834          * This routine must be very careful in its work. Protocol
10835          * processing is up and running so care must be taken to spl...()
10836          * when you need to do something that may effect the stcb/asoc. The
10837          * sb is locked however. When data is copied the protocol processing
10838          * should be enabled since this is a slower operation...
10839          */
10840         struct sctp_stream_queue_pending *sp = NULL;
10841         int resv_in_first;
10842
10843         *error = 0;
10844         /* Now can we send this? */
10845         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
10846             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
10847             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
10848             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
10849                 /* got data while shutting down */
10850                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
10851                 *error = ECONNRESET;
10852                 goto out_now;
10853         }
10854         sctp_alloc_a_strmoq(stcb, sp);
10855         if (sp == NULL) {
10856                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10857                 *error = ENOMEM;
10858                 goto out_now;
10859         }
10860         sp->act_flags = 0;
10861         sp->sender_all_done = 0;
10862         sp->sinfo_flags = srcv->sinfo_flags;
10863         sp->timetolive = srcv->sinfo_timetolive;
10864         sp->ppid = srcv->sinfo_ppid;
10865         sp->context = srcv->sinfo_context;
10866         sp->strseq = 0;
10867         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
10868
10869         sp->stream = srcv->sinfo_stream;
10870         sp->length = min(uio->uio_resid, max_send_len);
10871         if ((sp->length == (uint32_t) uio->uio_resid) &&
10872             ((user_marks_eor == 0) ||
10873             (srcv->sinfo_flags & SCTP_EOF) ||
10874             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
10875                 sp->msg_is_complete = 1;
10876         } else {
10877                 sp->msg_is_complete = 0;
10878         }
10879         sp->sender_all_done = 0;
10880         sp->some_taken = 0;
10881         sp->put_last_out = 0;
10882         resv_in_first = sizeof(struct sctp_data_chunk);
10883         sp->data = sp->tail_mbuf = NULL;
10884         *error = sctp_copy_one(sp, uio, resv_in_first);
10885         if (*error) {
10886                 sctp_free_a_strmoq(stcb, sp);
10887                 sp = NULL;
10888         } else {
10889                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
10890                         sp->net = net;
10891                         sp->addr_over = 1;
10892                 } else {
10893                         sp->net = asoc->primary_destination;
10894                         sp->addr_over = 0;
10895                 }
10896                 atomic_add_int(&sp->net->ref_count, 1);
10897                 sctp_set_prsctp_policy(stcb, sp);
10898         }
10899 out_now:
10900         return (sp);
10901 }
10902
10903
10904 int
10905 sctp_sosend(struct socket *so,
10906     struct sockaddr *addr,
10907     struct uio *uio,
10908     struct mbuf *top,
10909     struct mbuf *control,
10910     int flags,
10911     struct thread *p
10912 )
10913 {
10914         struct sctp_inpcb *inp;
10915         int error, use_rcvinfo = 0;
10916         struct sctp_sndrcvinfo srcv;
10917
10918         inp = (struct sctp_inpcb *)so->so_pcb;
10919         if (control) {
10920                 /* process cmsg snd/rcv info (maybe a assoc-id) */
10921                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
10922                     sizeof(srcv))) {
10923                         /* got one */
10924                         use_rcvinfo = 1;
10925                 }
10926         }
10927         error = sctp_lower_sosend(so, addr, uio, top,
10928             control,
10929             flags,
10930             use_rcvinfo, &srcv
10931             ,p
10932             );
10933         return (error);
10934 }
10935
10936
10937 int
10938 sctp_lower_sosend(struct socket *so,
10939     struct sockaddr *addr,
10940     struct uio *uio,
10941     struct mbuf *i_pak,
10942     struct mbuf *control,
10943     int flags,
10944     int use_rcvinfo,
10945     struct sctp_sndrcvinfo *srcv
10946     ,
10947     struct thread *p
10948 )
10949 {
10950         unsigned int sndlen = 0, max_len;
10951         int error, len;
10952         struct mbuf *top = NULL;
10953
10954 #if defined(__NetBSD__) || defined(__OpenBSD_)
10955         int s;
10956
10957 #endif
10958         int queue_only = 0, queue_only_for_init = 0;
10959         int free_cnt_applied = 0;
10960         int un_sent = 0;
10961         int now_filled = 0;
10962         unsigned int inqueue_bytes = 0;
10963         struct sctp_block_entry be;
10964         struct sctp_inpcb *inp;
10965         struct sctp_tcb *stcb = NULL;
10966         struct timeval now;
10967         struct sctp_nets *net;
10968         struct sctp_association *asoc;
10969         struct sctp_inpcb *t_inp;
10970         int user_marks_eor;
10971         int create_lock_applied = 0;
10972         int nagle_applies = 0;
10973         int some_on_control = 0;
10974         int got_all_of_the_send = 0;
10975         int hold_tcblock = 0;
10976         int non_blocking = 0;
10977         int temp_flags = 0;
10978         uint32_t local_add_more, local_soresv = 0;
10979
10980         error = 0;
10981         net = NULL;
10982         stcb = NULL;
10983         asoc = NULL;
10984
10985         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
10986         if (inp == NULL) {
10987                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
10988                 error = EFAULT;
10989                 if (i_pak) {
10990                         SCTP_RELEASE_PKT(i_pak);
10991                 }
10992                 return (error);
10993         }
10994         if ((uio == NULL) && (i_pak == NULL)) {
10995                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10996                 return (EINVAL);
10997         }
10998         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
10999         atomic_add_int(&inp->total_sends, 1);
11000         if (uio) {
11001                 if (uio->uio_resid < 0) {
11002                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11003                         return (EINVAL);
11004                 }
11005                 sndlen = uio->uio_resid;
11006         } else {
11007                 top = SCTP_HEADER_TO_CHAIN(i_pak);
11008                 sndlen = SCTP_HEADER_LEN(i_pak);
11009         }
11010         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
11011             addr,
11012             sndlen);
11013         /*-
11014          * Pre-screen address, if one is given the sin-len
11015          * must be set correctly!
11016          */
11017         if (addr) {
11018                 if ((addr->sa_family == AF_INET) &&
11019                     (addr->sa_len != sizeof(struct sockaddr_in))) {
11020                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11021                         error = EINVAL;
11022                         goto out_unlocked;
11023                 } else if ((addr->sa_family == AF_INET6) &&
11024                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
11025                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11026                         error = EINVAL;
11027                         goto out_unlocked;
11028                 }
11029         }
11030         hold_tcblock = 0;
11031
11032         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
11033             (inp->sctp_socket->so_qlimit)) {
11034                 /* The listener can NOT send */
11035                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11036                 error = EFAULT;
11037                 goto out_unlocked;
11038         }
11039         if ((use_rcvinfo) && srcv) {
11040                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
11041                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
11042                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11043                         error = EINVAL;
11044                         goto out_unlocked;
11045                 }
11046                 if (srcv->sinfo_flags)
11047                         SCTP_STAT_INCR(sctps_sends_with_flags);
11048
11049                 if (srcv->sinfo_flags & SCTP_SENDALL) {
11050                         /* its a sendall */
11051                         error = sctp_sendall(inp, uio, top, srcv);
11052                         top = NULL;
11053                         goto out_unlocked;
11054                 }
11055         }
11056         /* now we must find the assoc */
11057         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
11058             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
11059                 SCTP_INP_RLOCK(inp);
11060                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
11061                 if (stcb == NULL) {
11062                         SCTP_INP_RUNLOCK(inp);
11063                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11064                         error = ENOTCONN;
11065                         goto out_unlocked;
11066                 }
11067                 hold_tcblock = 0;
11068                 SCTP_INP_RUNLOCK(inp);
11069                 if (addr) {
11070                         /* Must locate the net structure if addr given */
11071                         net = sctp_findnet(stcb, addr);
11072                         if (net) {
11073                                 /* validate port was 0 or correct */
11074                                 struct sockaddr_in *sin;
11075
11076                                 sin = (struct sockaddr_in *)addr;
11077                                 if ((sin->sin_port != 0) &&
11078                                     (sin->sin_port != stcb->rport)) {
11079                                         net = NULL;
11080                                 }
11081                         }
11082                         temp_flags |= SCTP_ADDR_OVER;
11083                 } else
11084                         net = stcb->asoc.primary_destination;
11085                 if (addr && (net == NULL)) {
11086                         /* Could not find address, was it legal */
11087                         if (addr->sa_family == AF_INET) {
11088                                 struct sockaddr_in *sin;
11089
11090                                 sin = (struct sockaddr_in *)addr;
11091                                 if (sin->sin_addr.s_addr == 0) {
11092                                         if ((sin->sin_port == 0) ||
11093                                             (sin->sin_port == stcb->rport)) {
11094                                                 net = stcb->asoc.primary_destination;
11095                                         }
11096                                 }
11097                         } else {
11098                                 struct sockaddr_in6 *sin6;
11099
11100                                 sin6 = (struct sockaddr_in6 *)addr;
11101                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
11102                                         if ((sin6->sin6_port == 0) ||
11103                                             (sin6->sin6_port == stcb->rport)) {
11104                                                 net = stcb->asoc.primary_destination;
11105                                         }
11106                                 }
11107                         }
11108                 }
11109                 if (net == NULL) {
11110                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11111                         error = EINVAL;
11112                         goto out_unlocked;
11113                 }
11114         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
11115                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
11116                 if (stcb) {
11117                         if (addr)
11118                                 /*
11119                                  * Must locate the net structure if addr
11120                                  * given
11121                                  */
11122                                 net = sctp_findnet(stcb, addr);
11123                         else
11124                                 net = stcb->asoc.primary_destination;
11125                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
11126                             ((net == NULL) || (addr == NULL))) {
11127                                 struct sockaddr_in *sin;
11128
11129                                 if (addr == NULL) {
11130                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11131                                         error = EINVAL;
11132                                         goto out_unlocked;
11133                                 }
11134                                 sin = (struct sockaddr_in *)addr;
11135                                 /* Validate port is 0 or correct */
11136                                 if ((sin->sin_port != 0) &&
11137                                     (sin->sin_port != stcb->rport)) {
11138                                         net = NULL;
11139                                 }
11140                         }
11141                 }
11142                 hold_tcblock = 0;
11143         } else if (addr) {
11144                 /*-
11145                  * Since we did not use findep we must
11146                  * increment it, and if we don't find a tcb
11147                  * decrement it.
11148                  */
11149                 SCTP_INP_WLOCK(inp);
11150                 SCTP_INP_INCR_REF(inp);
11151                 SCTP_INP_WUNLOCK(inp);
11152                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11153                 if (stcb == NULL) {
11154                         SCTP_INP_WLOCK(inp);
11155                         SCTP_INP_DECR_REF(inp);
11156                         SCTP_INP_WUNLOCK(inp);
11157                 } else {
11158                         hold_tcblock = 1;
11159                 }
11160         }
11161         if ((stcb == NULL) && (addr)) {
11162                 /* Possible implicit send? */
11163                 SCTP_ASOC_CREATE_LOCK(inp);
11164                 create_lock_applied = 1;
11165                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
11166                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
11167                         /* Should I really unlock ? */
11168                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11169                         error = EFAULT;
11170                         goto out_unlocked;
11171
11172                 }
11173                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
11174                     (addr->sa_family == AF_INET6)) {
11175                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11176                         error = EINVAL;
11177                         goto out_unlocked;
11178                 }
11179                 SCTP_INP_WLOCK(inp);
11180                 SCTP_INP_INCR_REF(inp);
11181                 SCTP_INP_WUNLOCK(inp);
11182                 /* With the lock applied look again */
11183                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11184                 if (stcb == NULL) {
11185                         SCTP_INP_WLOCK(inp);
11186                         SCTP_INP_DECR_REF(inp);
11187                         SCTP_INP_WUNLOCK(inp);
11188                 } else {
11189                         hold_tcblock = 1;
11190                 }
11191                 if (t_inp != inp) {
11192                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11193                         error = ENOTCONN;
11194                         goto out_unlocked;
11195                 }
11196         }
11197         if (stcb == NULL) {
11198                 if (addr == NULL) {
11199                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
11200                         error = ENOENT;
11201                         goto out_unlocked;
11202                 } else {
11203                         /*
11204                          * UDP style, we must go ahead and start the INIT
11205                          * process
11206                          */
11207                         uint32_t vrf_id;
11208
11209                         if ((use_rcvinfo) && (srcv) &&
11210                             ((srcv->sinfo_flags & SCTP_ABORT) ||
11211                             ((srcv->sinfo_flags & SCTP_EOF) &&
11212                             (sndlen == 0)))) {
11213                                 /*-
11214                                  * User asks to abort a non-existant assoc,
11215                                  * or EOF a non-existant assoc with no data
11216                                  */
11217                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
11218                                 error = ENOENT;
11219                                 goto out_unlocked;
11220                         }
11221                         /* get an asoc/stcb struct */
11222                         vrf_id = inp->def_vrf_id;
11223 #ifdef INVARIANTS
11224                         if (create_lock_applied == 0) {
11225                                 panic("Error, should hold create lock and I don't?");
11226                         }
11227 #endif
11228                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
11229                             p
11230                             );
11231                         if (stcb == NULL) {
11232                                 /* Error is setup for us in the call */
11233                                 goto out_unlocked;
11234                         }
11235                         if (create_lock_applied) {
11236                                 SCTP_ASOC_CREATE_UNLOCK(inp);
11237                                 create_lock_applied = 0;
11238                         } else {
11239                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
11240                         }
11241                         /*
11242                          * Turn on queue only flag to prevent data from
11243                          * being sent
11244                          */
11245                         queue_only = 1;
11246                         asoc = &stcb->asoc;
11247                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
11248                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
11249
11250                         /* initialize authentication params for the assoc */
11251                         sctp_initialize_auth_params(inp, stcb);
11252
11253                         if (control) {
11254                                 /*
11255                                  * see if a init structure exists in cmsg
11256                                  * headers
11257                                  */
11258                                 struct sctp_initmsg initm;
11259                                 int i;
11260
11261                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
11262                                     sizeof(initm))) {
11263                                         /*
11264                                          * we have an INIT override of the
11265                                          * default
11266                                          */
11267                                         if (initm.sinit_max_attempts)
11268                                                 asoc->max_init_times = initm.sinit_max_attempts;
11269                                         if (initm.sinit_num_ostreams)
11270                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
11271                                         if (initm.sinit_max_instreams)
11272                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
11273                                         if (initm.sinit_max_init_timeo)
11274                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
11275                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
11276                                                 /* Default is NOT correct */
11277                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
11278                                                     asoc->streamoutcnt, asoc->pre_open_streams);
11279                                                 /*
11280                                                  * What happens if this
11281                                                  * fails? we panic ...
11282                                                  */
11283                                                 {
11284                                                         struct sctp_stream_out *tmp_str;
11285                                                         int had_lock = 0;
11286
11287                                                         if (hold_tcblock) {
11288                                                                 had_lock = 1;
11289                                                                 SCTP_TCB_UNLOCK(stcb);
11290                                                         }
11291                                                         SCTP_MALLOC(tmp_str,
11292                                                             struct sctp_stream_out *,
11293                                                             (asoc->pre_open_streams *
11294                                                             sizeof(struct sctp_stream_out)),
11295                                                             SCTP_M_STRMO);
11296                                                         if (had_lock) {
11297                                                                 SCTP_TCB_LOCK(stcb);
11298                                                         }
11299                                                         if (tmp_str != NULL) {
11300                                                                 SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
11301                                                                 asoc->strmout = tmp_str;
11302                                                                 asoc->streamoutcnt = asoc->pre_open_streams;
11303                                                         } else {
11304                                                                 asoc->pre_open_streams = asoc->streamoutcnt;
11305                                                         }
11306                                                 }
11307                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
11308                                                         /*-
11309                                                          * inbound side must be set
11310                                                          * to 0xffff, also NOTE when
11311                                                          * we get the INIT-ACK back
11312                                                          * (for INIT sender) we MUST
11313                                                          * reduce the count
11314                                                          * (streamoutcnt) but first
11315                                                          * check if we sent to any
11316                                                          * of the upper streams that
11317                                                          * were dropped (if some
11318                                                          * were). Those that were
11319                                                          * dropped must be notified
11320                                                          * to the upper layer as
11321                                                          * failed to send.
11322                                                          */
11323                                                         asoc->strmout[i].next_sequence_sent = 0x0;
11324                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
11325                                                         asoc->strmout[i].stream_no = i;
11326                                                         asoc->strmout[i].last_msg_incomplete = 0;
11327                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
11328                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
11329                                                 }
11330                                         }
11331                                 }
11332                         }
11333                         hold_tcblock = 1;
11334                         /* out with the INIT */
11335                         queue_only_for_init = 1;
11336                         /*-
11337                          * we may want to dig in after this call and adjust the MTU
11338                          * value. It defaulted to 1500 (constant) but the ro
11339                          * structure may now have an update and thus we may need to
11340                          * change it BEFORE we append the message.
11341                          */
11342                         net = stcb->asoc.primary_destination;
11343                         asoc = &stcb->asoc;
11344                 }
11345         }
11346         if ((SCTP_SO_IS_NBIO(so)
11347             || (flags & MSG_NBIO)
11348             )) {
11349                 non_blocking = 1;
11350         }
11351         asoc = &stcb->asoc;
11352
11353         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
11354                 if (sndlen > asoc->smallest_mtu) {
11355                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11356                         error = EMSGSIZE;
11357                         goto out_unlocked;
11358                 }
11359         }
11360         /* would we block? */
11361         if (non_blocking) {
11362                 if (hold_tcblock == 0) {
11363                         SCTP_TCB_LOCK(stcb);
11364                         hold_tcblock = 1;
11365                 }
11366                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11367                 if ((SCTP_SB_LIMIT_SND(so) <
11368                     (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
11369                     (stcb->asoc.chunks_on_out_queue >
11370                     sctp_max_chunks_on_queue)) {
11371                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
11372                         if (sndlen > SCTP_SB_LIMIT_SND(so))
11373                                 error = EMSGSIZE;
11374                         else
11375                                 error = EWOULDBLOCK;
11376                         goto out_unlocked;
11377                 }
11378                 stcb->asoc.sb_send_resv += sndlen;
11379                 SCTP_TCB_UNLOCK(stcb);
11380                 hold_tcblock = 0;
11381         } else {
11382                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
11383         }
11384         local_soresv = sndlen;
11385         /* Keep the stcb from being freed under our feet */
11386         if (free_cnt_applied) {
11387 #ifdef INVARIANTS
11388                 panic("refcnt already incremented");
11389 #else
11390                 printf("refcnt:1 already incremented?\n");
11391 #endif
11392         } else {
11393                 atomic_add_int(&stcb->asoc.refcnt, 1);
11394                 free_cnt_applied = 1;
11395         }
11396         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11397                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11398                 error = ECONNRESET;
11399                 goto out_unlocked;
11400         }
11401         if (create_lock_applied) {
11402                 SCTP_ASOC_CREATE_UNLOCK(inp);
11403                 create_lock_applied = 0;
11404         }
11405         if (asoc->stream_reset_outstanding) {
11406                 /*
11407                  * Can't queue any data while stream reset is underway.
11408                  */
11409                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
11410                 error = EAGAIN;
11411                 goto out_unlocked;
11412         }
11413         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
11414             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
11415                 queue_only = 1;
11416         }
11417         if ((use_rcvinfo == 0) || (srcv == NULL)) {
11418                 /* Grab the default stuff from the asoc */
11419                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
11420         }
11421         /* we are now done with all control */
11422         if (control) {
11423                 sctp_m_freem(control);
11424                 control = NULL;
11425         }
11426         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11427             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11428             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11429             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11430                 if ((use_rcvinfo) &&
11431                     (srcv->sinfo_flags & SCTP_ABORT)) {
11432                         ;
11433                 } else {
11434                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11435                         error = ECONNRESET;
11436                         goto out_unlocked;
11437                 }
11438         }
11439         /* Ok, we will attempt a msgsnd :> */
11440         if (p) {
11441                 p->td_ru.ru_msgsnd++;
11442         }
11443         if (stcb) {
11444                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
11445                         net = stcb->asoc.primary_destination;
11446                 }
11447         }
11448         if (net == NULL) {
11449                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11450                 error = EINVAL;
11451                 goto out_unlocked;
11452         }
11453         if ((net->flight_size > net->cwnd) && (sctp_cmt_on_off == 0)) {
11454                 /*-
11455                  * CMT: Added check for CMT above. net above is the primary
11456                  * dest. If CMT is ON, sender should always attempt to send
11457                  * with the output routine sctp_fill_outqueue() that loops
11458                  * through all destination addresses. Therefore, if CMT is
11459                  * ON, queue_only is NOT set to 1 here, so that
11460                  * sctp_chunk_output() can be called below.
11461                  */
11462                 queue_only = 1;
11463
11464         } else if (asoc->ifp_had_enobuf) {
11465                 SCTP_STAT_INCR(sctps_ifnomemqueued);
11466                 if (net->flight_size > (net->mtu * 2))
11467                         queue_only = 1;
11468                 asoc->ifp_had_enobuf = 0;
11469         } else {
11470                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11471                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
11472         }
11473         /* Are we aborting? */
11474         if (srcv->sinfo_flags & SCTP_ABORT) {
11475                 struct mbuf *mm;
11476                 int tot_demand, tot_out = 0, max_out;
11477
11478                 SCTP_STAT_INCR(sctps_sends_with_abort);
11479                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
11480                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
11481                         /* It has to be up before we abort */
11482                         /* how big is the user initiated abort? */
11483                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11484                         error = EINVAL;
11485                         goto out;
11486                 }
11487                 if (hold_tcblock) {
11488                         SCTP_TCB_UNLOCK(stcb);
11489                         hold_tcblock = 0;
11490                 }
11491                 if (top) {
11492                         struct mbuf *cntm = NULL;
11493
11494                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
11495                         if (sndlen != 0) {
11496                                 cntm = top;
11497                                 while (cntm) {
11498                                         tot_out += SCTP_BUF_LEN(cntm);
11499                                         cntm = SCTP_BUF_NEXT(cntm);
11500                                 }
11501                         }
11502                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
11503                 } else {
11504                         /* Must fit in a MTU */
11505                         tot_out = sndlen;
11506                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
11507                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
11508                                 /* To big */
11509                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11510                                 error = EMSGSIZE;
11511                                 goto out;
11512                         }
11513                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
11514                 }
11515                 if (mm == NULL) {
11516                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11517                         error = ENOMEM;
11518                         goto out;
11519                 }
11520                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
11521                 max_out -= sizeof(struct sctp_abort_msg);
11522                 if (tot_out > max_out) {
11523                         tot_out = max_out;
11524                 }
11525                 if (mm) {
11526                         struct sctp_paramhdr *ph;
11527
11528                         /* now move forward the data pointer */
11529                         ph = mtod(mm, struct sctp_paramhdr *);
11530                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
11531                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
11532                         ph++;
11533                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
11534                         if (top == NULL) {
11535                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
11536                                 if (error) {
11537                                         /*-
11538                                          * Here if we can't get his data we
11539                                          * still abort we just don't get to
11540                                          * send the users note :-0
11541                                          */
11542                                         sctp_m_freem(mm);
11543                                         mm = NULL;
11544                                 }
11545                         } else {
11546                                 if (sndlen != 0) {
11547                                         SCTP_BUF_NEXT(mm) = top;
11548                                 }
11549                         }
11550                 }
11551                 if (hold_tcblock == 0) {
11552                         SCTP_TCB_LOCK(stcb);
11553                         hold_tcblock = 1;
11554                 }
11555                 atomic_add_int(&stcb->asoc.refcnt, -1);
11556                 free_cnt_applied = 0;
11557                 /* release this lock, otherwise we hang on ourselves */
11558                 sctp_abort_an_association(stcb->sctp_ep, stcb,
11559                     SCTP_RESPONSE_TO_USER_REQ,
11560                     mm, SCTP_SO_LOCKED);
11561                 /* now relock the stcb so everything is sane */
11562                 hold_tcblock = 0;
11563                 stcb = NULL;
11564                 /*
11565                  * In this case top is already chained to mm avoid double
11566                  * free, since we free it below if top != NULL and driver
11567                  * would free it after sending the packet out
11568                  */
11569                 if (sndlen != 0) {
11570                         top = NULL;
11571                 }
11572                 goto out_unlocked;
11573         }
11574         /* Calculate the maximum we can send */
11575         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11576         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
11577                 if (non_blocking) {
11578                         /* we already checked for non-blocking above. */
11579                         max_len = sndlen;
11580                 } else {
11581                         max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
11582                 }
11583         } else {
11584                 max_len = 0;
11585         }
11586         if (hold_tcblock) {
11587                 SCTP_TCB_UNLOCK(stcb);
11588                 hold_tcblock = 0;
11589         }
11590         /* Is the stream no. valid? */
11591         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
11592                 /* Invalid stream number */
11593                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11594                 error = EINVAL;
11595                 goto out_unlocked;
11596         }
11597         if (asoc->strmout == NULL) {
11598                 /* huh? software error */
11599                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11600                 error = EFAULT;
11601                 goto out_unlocked;
11602         }
11603         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
11604         if ((user_marks_eor == 0) &&
11605             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
11606                 /* It will NEVER fit */
11607                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11608                 error = EMSGSIZE;
11609                 goto out_unlocked;
11610         }
11611         if ((uio == NULL) && user_marks_eor) {
11612                 /*-
11613                  * We do not support eeor mode for
11614                  * sending with mbuf chains (like sendfile).
11615                  */
11616                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11617                 error = EINVAL;
11618                 goto out_unlocked;
11619         }
11620         if (user_marks_eor) {
11621                 local_add_more = sctp_add_more_threshold;
11622         } else {
11623                 /*-
11624                  * For non-eeor the whole message must fit in
11625                  * the socket send buffer.
11626                  */
11627                 local_add_more = sndlen;
11628         }
11629         len = 0;
11630         if (non_blocking) {
11631                 goto skip_preblock;
11632         }
11633         if (((max_len <= local_add_more) &&
11634             (SCTP_SB_LIMIT_SND(so) > local_add_more)) ||
11635             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) > sctp_max_chunks_on_queue)) {      /* if */
11636                 /* No room right no ! */
11637                 SOCKBUF_LOCK(&so->so_snd);
11638                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11639                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + sctp_add_more_threshold)) ||
11640                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) > sctp_max_chunks_on_queue /* while */ )) {
11641
11642                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11643                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA,
11644                                     so, asoc, sndlen);
11645                         }
11646                         be.error = 0;
11647                         stcb->block_entry = &be;
11648                         error = sbwait(&so->so_snd);
11649                         stcb->block_entry = NULL;
11650                         if (error || so->so_error || be.error) {
11651                                 if (error == 0) {
11652                                         if (so->so_error)
11653                                                 error = so->so_error;
11654                                         if (be.error) {
11655                                                 error = be.error;
11656                                         }
11657                                 }
11658                                 SOCKBUF_UNLOCK(&so->so_snd);
11659                                 goto out_unlocked;
11660                         }
11661                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11662                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
11663                                     so, asoc, stcb->asoc.total_output_queue_size);
11664                         }
11665                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11666                                 goto out_unlocked;
11667                         }
11668                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11669                 }
11670                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11671                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
11672                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
11673                 } else {
11674                         max_len = 0;
11675                 }
11676                 SOCKBUF_UNLOCK(&so->so_snd);
11677         }
11678 skip_preblock:
11679         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11680                 goto out_unlocked;
11681         }
11682         atomic_add_int(&stcb->total_sends, 1);
11683         /*
11684          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
11685          * case NOTE: uio will be null when top/mbuf is passed
11686          */
11687         if (sndlen == 0) {
11688                 if (srcv->sinfo_flags & SCTP_EOF) {
11689                         got_all_of_the_send = 1;
11690                         goto dataless_eof;
11691                 } else {
11692                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11693                         error = EINVAL;
11694                         goto out;
11695                 }
11696         }
11697         if (top == NULL) {
11698                 struct sctp_stream_queue_pending *sp;
11699                 struct sctp_stream_out *strm;
11700                 uint32_t sndout, initial_out;
11701
11702                 initial_out = uio->uio_resid;
11703
11704                 SCTP_TCB_SEND_LOCK(stcb);
11705                 if ((asoc->stream_locked) &&
11706                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
11707                         SCTP_TCB_SEND_UNLOCK(stcb);
11708                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11709                         error = EINVAL;
11710                         goto out;
11711                 }
11712                 SCTP_TCB_SEND_UNLOCK(stcb);
11713
11714                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
11715                 if (strm->last_msg_incomplete == 0) {
11716         do_a_copy_in:
11717                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
11718                         if ((sp == NULL) || (error)) {
11719                                 goto out;
11720                         }
11721                         SCTP_TCB_SEND_LOCK(stcb);
11722                         if (sp->msg_is_complete) {
11723                                 strm->last_msg_incomplete = 0;
11724                                 asoc->stream_locked = 0;
11725                         } else {
11726                                 /*
11727                                  * Just got locked to this guy in case of an
11728                                  * interrupt.
11729                                  */
11730                                 strm->last_msg_incomplete = 1;
11731                                 asoc->stream_locked = 1;
11732                                 asoc->stream_locked_on = srcv->sinfo_stream;
11733                                 sp->sender_all_done = 0;
11734                         }
11735                         sctp_snd_sb_alloc(stcb, sp->length);
11736                         atomic_add_int(&asoc->stream_queue_cnt, 1);
11737                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
11738                                 sp->strseq = strm->next_sequence_sent;
11739                                 if (sctp_logging_level & SCTP_LOG_AT_SEND_2_SCTP) {
11740                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
11741                                             (uintptr_t) stcb, sp->length,
11742                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
11743                                 }
11744                                 strm->next_sequence_sent++;
11745                         } else {
11746                                 SCTP_STAT_INCR(sctps_sends_with_unord);
11747                         }
11748                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
11749                         if ((strm->next_spoke.tqe_next == NULL) &&
11750                             (strm->next_spoke.tqe_prev == NULL)) {
11751                                 /* Not on wheel, insert */
11752                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
11753                         }
11754                         SCTP_TCB_SEND_UNLOCK(stcb);
11755                 } else {
11756                         SCTP_TCB_SEND_LOCK(stcb);
11757                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
11758                         SCTP_TCB_SEND_UNLOCK(stcb);
11759                         if (sp == NULL) {
11760                                 /* ???? Huh ??? last msg is gone */
11761 #ifdef INVARIANTS
11762                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
11763 #else
11764                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
11765                                 strm->last_msg_incomplete = 0;
11766 #endif
11767                                 goto do_a_copy_in;
11768
11769                         }
11770                 }
11771                 while (uio->uio_resid > 0) {
11772                         /* How much room do we have? */
11773                         struct mbuf *new_tail, *mm;
11774
11775                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
11776                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
11777                         else
11778                                 max_len = 0;
11779
11780                         if ((max_len > sctp_add_more_threshold) ||
11781                             (max_len && (SCTP_SB_LIMIT_SND(so) < sctp_add_more_threshold)) ||
11782                             (uio->uio_resid &&
11783                             (uio->uio_resid <= (int)max_len))) {
11784                                 sndout = 0;
11785                                 new_tail = NULL;
11786                                 if (hold_tcblock) {
11787                                         SCTP_TCB_UNLOCK(stcb);
11788                                         hold_tcblock = 0;
11789                                 }
11790                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
11791                                 if ((mm == NULL) || error) {
11792                                         if (mm) {
11793                                                 sctp_m_freem(mm);
11794                                         }
11795                                         goto out;
11796                                 }
11797                                 /* Update the mbuf and count */
11798                                 SCTP_TCB_SEND_LOCK(stcb);
11799                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11800                                         /*
11801                                          * we need to get out. Peer probably
11802                                          * aborted.
11803                                          */
11804                                         sctp_m_freem(mm);
11805                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
11806                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11807                                                 error = ECONNRESET;
11808                                         }
11809                                         SCTP_TCB_SEND_UNLOCK(stcb);
11810                                         goto out;
11811                                 }
11812                                 if (sp->tail_mbuf) {
11813                                         /* tack it to the end */
11814                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
11815                                         sp->tail_mbuf = new_tail;
11816                                 } else {
11817                                         /* A stolen mbuf */
11818                                         sp->data = mm;
11819                                         sp->tail_mbuf = new_tail;
11820                                 }
11821                                 sctp_snd_sb_alloc(stcb, sndout);
11822                                 atomic_add_int(&sp->length, sndout);
11823                                 len += sndout;
11824
11825                                 /* Did we reach EOR? */
11826                                 if ((uio->uio_resid == 0) &&
11827                                     ((user_marks_eor == 0) ||
11828                                     (srcv->sinfo_flags & SCTP_EOF) ||
11829                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
11830                                     ) {
11831                                         sp->msg_is_complete = 1;
11832                                 } else {
11833                                         sp->msg_is_complete = 0;
11834                                 }
11835                                 SCTP_TCB_SEND_UNLOCK(stcb);
11836                         }
11837                         if (uio->uio_resid == 0) {
11838                                 /* got it all? */
11839                                 continue;
11840                         }
11841                         /* PR-SCTP? */
11842                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
11843                                 /*
11844                                  * This is ugly but we must assure locking
11845                                  * order
11846                                  */
11847                                 if (hold_tcblock == 0) {
11848                                         SCTP_TCB_LOCK(stcb);
11849                                         hold_tcblock = 1;
11850                                 }
11851                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
11852                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11853                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
11854                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
11855                                 else
11856                                         max_len = 0;
11857                                 if (max_len > 0) {
11858                                         continue;
11859                                 }
11860                                 SCTP_TCB_UNLOCK(stcb);
11861                                 hold_tcblock = 0;
11862                         }
11863                         /* wait for space now */
11864                         if (non_blocking) {
11865                                 /* Non-blocking io in place out */
11866                                 goto skip_out_eof;
11867                         }
11868                         if ((net->flight_size > net->cwnd) &&
11869                             (sctp_cmt_on_off == 0)) {
11870                                 queue_only = 1;
11871                         } else if (asoc->ifp_had_enobuf) {
11872                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
11873                                 if (net->flight_size > (net->mtu * 2)) {
11874                                         queue_only = 1;
11875                                 } else {
11876                                         queue_only = 0;
11877                                 }
11878                                 asoc->ifp_had_enobuf = 0;
11879                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11880                                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
11881                                     sizeof(struct sctp_data_chunk)));
11882                         } else {
11883                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11884                                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
11885                                     sizeof(struct sctp_data_chunk)));
11886                                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
11887                                         queue_only = 1;
11888                                         SCTP_STAT_INCR(sctps_send_burst_avoid);
11889                                 } else if (net->flight_size > net->cwnd) {
11890                                         queue_only = 1;
11891                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
11892                                 } else {
11893                                         queue_only = 0;
11894                                 }
11895                         }
11896                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
11897                             (stcb->asoc.total_flight > 0) &&
11898                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
11899                             ) {
11900
11901                                 /*-
11902                                  * Ok, Nagle is set on and we have data outstanding.
11903                                  * Don't send anything and let SACKs drive out the
11904                                  * data unless wen have a "full" segment to send.
11905                                  */
11906                                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
11907                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
11908                                 }
11909                                 SCTP_STAT_INCR(sctps_naglequeued);
11910                                 nagle_applies = 1;
11911                         } else {
11912                                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
11913                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
11914                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
11915                                 }
11916                                 SCTP_STAT_INCR(sctps_naglesent);
11917                                 nagle_applies = 0;
11918                         }
11919                         /* What about the INIT, send it maybe */
11920                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11921
11922                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
11923                                     nagle_applies, un_sent);
11924                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
11925                                     stcb->asoc.total_flight,
11926                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
11927                         }
11928                         if (queue_only_for_init) {
11929                                 if (hold_tcblock == 0) {
11930                                         SCTP_TCB_LOCK(stcb);
11931                                         hold_tcblock = 1;
11932                                 }
11933                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
11934                                         /* a collision took us forward? */
11935                                         queue_only_for_init = 0;
11936                                         queue_only = 0;
11937                                 } else {
11938                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
11939                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
11940                                         queue_only_for_init = 0;
11941                                         queue_only = 1;
11942                                 }
11943                         }
11944                         if ((queue_only == 0) && (nagle_applies == 0)
11945                             ) {
11946                                 /*-
11947                                  * need to start chunk output
11948                                  * before blocking.. note that if
11949                                  * a lock is already applied, then
11950                                  * the input via the net is happening
11951                                  * and I don't need to start output :-D
11952                                  */
11953                                 if (hold_tcblock == 0) {
11954                                         if (SCTP_TCB_TRYLOCK(stcb)) {
11955                                                 hold_tcblock = 1;
11956                                                 sctp_chunk_output(inp,
11957                                                     stcb,
11958                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
11959                                         }
11960                                 } else {
11961                                         sctp_chunk_output(inp,
11962                                             stcb,
11963                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
11964                                 }
11965                                 if (hold_tcblock == 1) {
11966                                         SCTP_TCB_UNLOCK(stcb);
11967                                         hold_tcblock = 0;
11968                                 }
11969                         }
11970                         SOCKBUF_LOCK(&so->so_snd);
11971                         /*-
11972                          * This is a bit strange, but I think it will
11973                          * work. The total_output_queue_size is locked and
11974                          * protected by the TCB_LOCK, which we just released.
11975                          * There is a race that can occur between releasing it
11976                          * above, and me getting the socket lock, where sacks
11977                          * come in but we have not put the SB_WAIT on the
11978                          * so_snd buffer to get the wakeup. After the LOCK
11979                          * is applied the sack_processing will also need to
11980                          * LOCK the so->so_snd to do the actual sowwakeup(). So
11981                          * once we have the socket buffer lock if we recheck the
11982                          * size we KNOW we will get to sleep safely with the
11983                          * wakeup flag in place.
11984                          */
11985                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
11986                             min(sctp_add_more_threshold, SCTP_SB_LIMIT_SND(so)))
11987                             ) {
11988                                 if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11989                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
11990                                             so, asoc, uio->uio_resid);
11991                                 }
11992                                 be.error = 0;
11993                                 stcb->block_entry = &be;
11994                                 error = sbwait(&so->so_snd);
11995                                 stcb->block_entry = NULL;
11996
11997                                 if (error || so->so_error || be.error) {
11998                                         if (error == 0) {
11999                                                 if (so->so_error)
12000                                                         error = so->so_error;
12001                                                 if (be.error) {
12002                                                         error = be.error;
12003                                                 }
12004                                         }
12005                                         SOCKBUF_UNLOCK(&so->so_snd);
12006                                         goto out_unlocked;
12007                                 }
12008                                 if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
12009                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12010                                             so, asoc, stcb->asoc.total_output_queue_size);
12011                                 }
12012                         }
12013                         SOCKBUF_UNLOCK(&so->so_snd);
12014                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12015                                 goto out_unlocked;
12016                         }
12017                 }
12018                 SCTP_TCB_SEND_LOCK(stcb);
12019                 if (sp) {
12020                         if (sp->msg_is_complete == 0) {
12021                                 strm->last_msg_incomplete = 1;
12022                                 asoc->stream_locked = 1;
12023                                 asoc->stream_locked_on = srcv->sinfo_stream;
12024                         } else {
12025                                 sp->sender_all_done = 1;
12026                                 strm->last_msg_incomplete = 0;
12027                                 asoc->stream_locked = 0;
12028                         }
12029                 } else {
12030                         SCTP_PRINTF("Huh no sp TSNH?\n");
12031                         strm->last_msg_incomplete = 0;
12032                         asoc->stream_locked = 0;
12033                 }
12034                 SCTP_TCB_SEND_UNLOCK(stcb);
12035                 if (uio->uio_resid == 0) {
12036                         got_all_of_the_send = 1;
12037                 }
12038         } else if (top) {
12039                 /* We send in a 0, since we do NOT have any locks */
12040                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12041                 top = NULL;
12042                 if (srcv->sinfo_flags & SCTP_EOF) {
12043                         /*
12044                          * This should only happen for Panda for the mbuf
12045                          * send case, which does NOT yet support EEOR mode.
12046                          * Thus, we can just set this flag to do the proper
12047                          * EOF handling.
12048                          */
12049                         got_all_of_the_send = 1;
12050                 }
12051         }
12052         if (error) {
12053                 goto out;
12054         }
12055 dataless_eof:
12056         /* EOF thing ? */
12057         if ((srcv->sinfo_flags & SCTP_EOF) &&
12058             (got_all_of_the_send == 1) &&
12059             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)
12060             ) {
12061                 int cnt;
12062
12063                 SCTP_STAT_INCR(sctps_sends_with_eof);
12064                 error = 0;
12065                 if (hold_tcblock == 0) {
12066                         SCTP_TCB_LOCK(stcb);
12067                         hold_tcblock = 1;
12068                 }
12069                 cnt = sctp_is_there_unsent_data(stcb);
12070                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12071                     TAILQ_EMPTY(&asoc->sent_queue) &&
12072                     (cnt == 0)) {
12073                         if (asoc->locked_on_sending) {
12074                                 goto abort_anyway;
12075                         }
12076                         /* there is nothing queued to send, so I'm done... */
12077                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12078                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12079                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12080                                 /* only send SHUTDOWN the first time through */
12081                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
12082                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
12083                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
12084                                 }
12085                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
12086                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
12087                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
12088                                     asoc->primary_destination);
12089                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12090                                     asoc->primary_destination);
12091                         }
12092                 } else {
12093                         /*-
12094                          * we still got (or just got) data to send, so set
12095                          * SHUTDOWN_PENDING
12096                          */
12097                         /*-
12098                          * XXX sockets draft says that SCTP_EOF should be
12099                          * sent with no data.  currently, we will allow user
12100                          * data to be sent first and move to
12101                          * SHUTDOWN-PENDING
12102                          */
12103                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12104                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12105                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12106                                 if (hold_tcblock == 0) {
12107                                         SCTP_TCB_LOCK(stcb);
12108                                         hold_tcblock = 1;
12109                                 }
12110                                 if (asoc->locked_on_sending) {
12111                                         /* Locked to send out the data */
12112                                         struct sctp_stream_queue_pending *sp;
12113
12114                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
12115                                         if (sp) {
12116                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
12117                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
12118                                         }
12119                                 }
12120                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
12121                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12122                                     TAILQ_EMPTY(&asoc->sent_queue) &&
12123                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
12124                         abort_anyway:
12125                                         if (free_cnt_applied) {
12126                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
12127                                                 free_cnt_applied = 0;
12128                                         }
12129                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
12130                                             SCTP_RESPONSE_TO_USER_REQ,
12131                                             NULL, SCTP_SO_LOCKED);
12132                                         /*
12133                                          * now relock the stcb so everything
12134                                          * is sane
12135                                          */
12136                                         hold_tcblock = 0;
12137                                         stcb = NULL;
12138                                         goto out;
12139                                 }
12140                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12141                                     asoc->primary_destination);
12142                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
12143                         }
12144                 }
12145         }
12146 skip_out_eof:
12147         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
12148                 some_on_control = 1;
12149         }
12150         if ((net->flight_size > net->cwnd) &&
12151             (sctp_cmt_on_off == 0)) {
12152                 queue_only = 1;
12153         } else if (asoc->ifp_had_enobuf) {
12154                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12155                 if (net->flight_size > (net->mtu * 2)) {
12156                         queue_only = 1;
12157                 } else {
12158                         queue_only = 0;
12159                 }
12160                 asoc->ifp_had_enobuf = 0;
12161                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12162                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12163                     sizeof(struct sctp_data_chunk)));
12164         } else {
12165                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12166                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12167                     sizeof(struct sctp_data_chunk)));
12168                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12169                         queue_only = 1;
12170                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12171                 } else if (net->flight_size > net->cwnd) {
12172                         queue_only = 1;
12173                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12174                 } else {
12175                         queue_only = 0;
12176                 }
12177         }
12178         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12179             (stcb->asoc.total_flight > 0) &&
12180             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12181             ) {
12182                 /*-
12183                  * Ok, Nagle is set on and we have data outstanding.
12184                  * Don't send anything and let SACKs drive out the
12185                  * data unless wen have a "full" segment to send.
12186                  */
12187                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12188                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12189                 }
12190                 SCTP_STAT_INCR(sctps_naglequeued);
12191                 nagle_applies = 1;
12192         } else {
12193                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12194                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12195                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12196                 }
12197                 SCTP_STAT_INCR(sctps_naglesent);
12198                 nagle_applies = 0;
12199         }
12200         if (queue_only_for_init) {
12201                 if (hold_tcblock == 0) {
12202                         SCTP_TCB_LOCK(stcb);
12203                         hold_tcblock = 1;
12204                 }
12205                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12206                         /* a collision took us forward? */
12207                         queue_only_for_init = 0;
12208                         queue_only = 0;
12209                 } else {
12210                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12211                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
12212                         queue_only_for_init = 0;
12213                         queue_only = 1;
12214                 }
12215         }
12216         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
12217                 /* we can attempt to send too. */
12218                 if (hold_tcblock == 0) {
12219                         /*
12220                          * If there is activity recv'ing sacks no need to
12221                          * send
12222                          */
12223                         if (SCTP_TCB_TRYLOCK(stcb)) {
12224                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12225                                 hold_tcblock = 1;
12226                         }
12227                 } else {
12228                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12229                 }
12230         } else if ((queue_only == 0) &&
12231                     (stcb->asoc.peers_rwnd == 0) &&
12232             (stcb->asoc.total_flight == 0)) {
12233                 /* We get to have a probe outstanding */
12234                 if (hold_tcblock == 0) {
12235                         hold_tcblock = 1;
12236                         SCTP_TCB_LOCK(stcb);
12237                 }
12238                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12239         } else if (some_on_control) {
12240                 int num_out, reason, cwnd_full, frag_point;
12241
12242                 /* Here we do control only */
12243                 if (hold_tcblock == 0) {
12244                         hold_tcblock = 1;
12245                         SCTP_TCB_LOCK(stcb);
12246                 }
12247                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
12248                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
12249                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
12250         }
12251         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d",
12252             queue_only, stcb->asoc.peers_rwnd, un_sent,
12253             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
12254             stcb->asoc.total_output_queue_size, error);
12255
12256 out:
12257 out_unlocked:
12258
12259         if (local_soresv && stcb) {
12260                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
12261                 local_soresv = 0;
12262         }
12263         if (create_lock_applied) {
12264                 SCTP_ASOC_CREATE_UNLOCK(inp);
12265                 create_lock_applied = 0;
12266         }
12267         if ((stcb) && hold_tcblock) {
12268                 SCTP_TCB_UNLOCK(stcb);
12269         }
12270         if (stcb && free_cnt_applied) {
12271                 atomic_add_int(&stcb->asoc.refcnt, -1);
12272         }
12273 #ifdef INVARIANTS
12274         if (stcb) {
12275                 if (mtx_owned(&stcb->tcb_mtx)) {
12276                         panic("Leaving with tcb mtx owned?");
12277                 }
12278                 if (mtx_owned(&stcb->tcb_send_mtx)) {
12279                         panic("Leaving with tcb send mtx owned?");
12280                 }
12281         }
12282 #endif
12283         if (top) {
12284                 sctp_m_freem(top);
12285         }
12286         if (control) {
12287                 sctp_m_freem(control);
12288         }
12289         return (error);
12290 }
12291
12292
12293 /*
12294  * generate an AUTHentication chunk, if required
12295  */
12296 struct mbuf *
12297 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
12298     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
12299     struct sctp_tcb *stcb, uint8_t chunk)
12300 {
12301         struct mbuf *m_auth;
12302         struct sctp_auth_chunk *auth;
12303         int chunk_len;
12304
12305         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
12306             (stcb == NULL))
12307                 return (m);
12308
12309         /* sysctl disabled auth? */
12310         if (sctp_auth_disable)
12311                 return (m);
12312
12313         /* peer doesn't do auth... */
12314         if (!stcb->asoc.peer_supports_auth) {
12315                 return (m);
12316         }
12317         /* does the requested chunk require auth? */
12318         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
12319                 return (m);
12320         }
12321         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
12322         if (m_auth == NULL) {
12323                 /* no mbuf's */
12324                 return (m);
12325         }
12326         /* reserve some space if this will be the first mbuf */
12327         if (m == NULL)
12328                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
12329         /* fill in the AUTH chunk details */
12330         auth = mtod(m_auth, struct sctp_auth_chunk *);
12331         bzero(auth, sizeof(*auth));
12332         auth->ch.chunk_type = SCTP_AUTHENTICATION;
12333         auth->ch.chunk_flags = 0;
12334         chunk_len = sizeof(*auth) +
12335             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
12336         auth->ch.chunk_length = htons(chunk_len);
12337         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
12338         /* key id and hmac digest will be computed and filled in upon send */
12339
12340         /* save the offset where the auth was inserted into the chain */
12341         if (m != NULL) {
12342                 struct mbuf *cn;
12343
12344                 *offset = 0;
12345                 cn = m;
12346                 while (cn) {
12347                         *offset += SCTP_BUF_LEN(cn);
12348                         cn = SCTP_BUF_NEXT(cn);
12349                 }
12350         } else
12351                 *offset = 0;
12352
12353         /* update length and return pointer to the auth chunk */
12354         SCTP_BUF_LEN(m_auth) = chunk_len;
12355         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
12356         if (auth_ret != NULL)
12357                 *auth_ret = auth;
12358
12359         return (m);
12360 }
12361
12362 int
12363 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
12364 {
12365         struct nd_prefix *pfx = NULL;
12366         struct nd_pfxrouter *pfxrtr = NULL;
12367         struct sockaddr_in6 gw6;
12368
12369         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
12370                 return (0);
12371
12372         /* get prefix entry of address */
12373         LIST_FOREACH(pfx, &nd_prefix, ndpr_entry) {
12374                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
12375                         continue;
12376                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
12377                     &src6->sin6_addr, &pfx->ndpr_mask))
12378                         break;
12379         }
12380         /* no prefix entry in the prefix list */
12381         if (pfx == NULL) {
12382                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
12383                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
12384                 return (0);
12385         }
12386         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
12387         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
12388
12389         /* search installed gateway from prefix entry */
12390         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
12391             pfxrtr->pfr_next) {
12392                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
12393                 gw6.sin6_family = AF_INET6;
12394                 gw6.sin6_len = sizeof(struct sockaddr_in6);
12395                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
12396                     sizeof(struct in6_addr));
12397                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
12398                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
12399                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
12400                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
12401                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
12402                     ro->ro_rt->rt_gateway)) {
12403                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
12404                         return (1);
12405                 }
12406         }
12407         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
12408         return (0);
12409 }
12410 int
12411 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
12412 {
12413         struct sockaddr_in *sin, *mask;
12414         struct ifaddr *ifa;
12415         struct in_addr srcnetaddr, gwnetaddr;
12416
12417         if (ro == NULL || ro->ro_rt == NULL ||
12418             sifa->address.sa.sa_family != AF_INET) {
12419                 return (0);
12420         }
12421         ifa = (struct ifaddr *)sifa->ifa;
12422         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
12423         sin = (struct sockaddr_in *)&sifa->address.sin;
12424         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
12425         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
12426         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
12427         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
12428
12429         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
12430         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
12431         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
12432         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
12433         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
12434         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
12435                 return (1);
12436         }
12437         return (0);
12438 }