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     uint32_t length,
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 >= 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 (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 (length);
6253         }
6254         if ((length <= goal_mtu) ||
6255             ((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 length is larger than the goal_mtu. Do we wish
6261          * 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, length;
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                 if (send_lock_up == 0) {
6300                         SCTP_TCB_SEND_LOCK(stcb);
6301                         send_lock_up = 1;
6302                 }
6303                 sp = TAILQ_FIRST(&strq->outqueue);
6304                 if (sp) {
6305                         goto one_more_time;
6306                 }
6307                 if (strq->last_msg_incomplete) {
6308                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6309                             strq->stream_no,
6310                             strq->last_msg_incomplete);
6311                         strq->last_msg_incomplete = 0;
6312                 }
6313                 to_move = 0;
6314                 if (send_lock_up) {
6315                         SCTP_TCB_SEND_UNLOCK(stcb);
6316                         send_lock_up = 0;
6317                 }
6318                 goto out_of;
6319         }
6320         if ((sp->msg_is_complete) && (sp->length == 0)) {
6321                 if (sp->sender_all_done) {
6322                         /*
6323                          * We are doing differed cleanup. Last time through
6324                          * when we took all the data the sender_all_done was
6325                          * not set.
6326                          */
6327                         if (sp->put_last_out == 0) {
6328                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6329                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6330                                     sp->sender_all_done,
6331                                     sp->length,
6332                                     sp->msg_is_complete,
6333                                     sp->put_last_out,
6334                                     send_lock_up);
6335                         }
6336                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6337                                 SCTP_TCB_SEND_LOCK(stcb);
6338                                 send_lock_up = 1;
6339                         }
6340                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6341                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6342                         sctp_free_remote_addr(sp->net);
6343                         if (sp->data) {
6344                                 sctp_m_freem(sp->data);
6345                                 sp->data = NULL;
6346                         }
6347                         sctp_free_a_strmoq(stcb, sp);
6348
6349                         /* we can't be locked to it */
6350                         *locked = 0;
6351                         stcb->asoc.locked_on_sending = NULL;
6352                         if (send_lock_up) {
6353                                 SCTP_TCB_SEND_UNLOCK(stcb);
6354                                 send_lock_up = 0;
6355                         }
6356                         /* back to get the next msg */
6357                         goto one_more_time;
6358                 } else {
6359                         /*
6360                          * sender just finished this but still holds a
6361                          * reference
6362                          */
6363                         *locked = 1;
6364                         *giveup = 1;
6365                         to_move = 0;
6366                         goto out_of;
6367                 }
6368         } else {
6369                 /* is there some to get */
6370                 if (sp->length == 0) {
6371                         /* no */
6372                         *locked = 1;
6373                         *giveup = 1;
6374                         to_move = 0;
6375                         goto out_of;
6376                 }
6377         }
6378         some_taken = sp->some_taken;
6379         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6380                 sp->msg_is_complete = 1;
6381         }
6382 re_look:
6383         length = sp->length;
6384         if (sp->msg_is_complete) {
6385                 /* The message is complete */
6386                 to_move = min(length, frag_point);
6387                 if (to_move == length) {
6388                         /* All of it fits in the MTU */
6389                         if (sp->some_taken) {
6390                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6391                                 sp->put_last_out = 1;
6392                         } else {
6393                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6394                                 sp->put_last_out = 1;
6395                         }
6396                 } else {
6397                         /* Not all of it fits, we fragment */
6398                         if (sp->some_taken == 0) {
6399                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6400                         }
6401                         sp->some_taken = 1;
6402                 }
6403         } else {
6404                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu,
6405                     frag_point, eeor_mode);
6406                 if (to_move) {
6407                         /*-
6408                          * We use a snapshot of length in case it
6409                          * is expanding during the compare.
6410                          */
6411                         uint32_t llen;
6412
6413                         llen = length;
6414                         if (to_move >= llen) {
6415                                 to_move = llen;
6416                                 if (send_lock_up == 0) {
6417                                         /*-
6418                                          * We are taking all of an incomplete msg
6419                                          * thus we need a send lock.
6420                                          */
6421                                         SCTP_TCB_SEND_LOCK(stcb);
6422                                         send_lock_up = 1;
6423                                         if (sp->msg_is_complete) {
6424                                                 /*
6425                                                  * the sender finished the
6426                                                  * msg
6427                                                  */
6428                                                 goto re_look;
6429                                         }
6430                                 }
6431                         }
6432                         if (sp->some_taken == 0) {
6433                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6434                                 sp->some_taken = 1;
6435                         }
6436                 } else {
6437                         /* Nothing to take. */
6438                         if (sp->some_taken) {
6439                                 *locked = 1;
6440                         }
6441                         *giveup = 1;
6442                         to_move = 0;
6443                         goto out_of;
6444                 }
6445         }
6446
6447         /* If we reach here, we can copy out a chunk */
6448         sctp_alloc_a_chunk(stcb, chk);
6449         if (chk == NULL) {
6450                 /* No chunk memory */
6451                 *giveup = 1;
6452                 to_move = 0;
6453                 goto out_of;
6454         }
6455         /*
6456          * Setup for unordered if needed by looking at the user sent info
6457          * flags.
6458          */
6459         if (sp->sinfo_flags & SCTP_UNORDERED) {
6460                 rcv_flags |= SCTP_DATA_UNORDERED;
6461         }
6462         /* clear out the chunk before setting up */
6463         memset(chk, 0, sizeof(*chk));
6464         chk->rec.data.rcv_flags = rcv_flags;
6465
6466         if (to_move >= length) {
6467                 /* we think we can steal the whole thing */
6468                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6469                         SCTP_TCB_SEND_LOCK(stcb);
6470                         send_lock_up = 1;
6471                 }
6472                 if (to_move < sp->length) {
6473                         /* bail, it changed */
6474                         goto dont_do_it;
6475                 }
6476                 chk->data = sp->data;
6477                 chk->last_mbuf = sp->tail_mbuf;
6478                 /* register the stealing */
6479                 sp->data = sp->tail_mbuf = NULL;
6480         } else {
6481                 struct mbuf *m;
6482
6483 dont_do_it:
6484                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6485                 chk->last_mbuf = NULL;
6486                 if (chk->data == NULL) {
6487                         sp->some_taken = some_taken;
6488                         sctp_free_a_chunk(stcb, chk);
6489                         *bail = 1;
6490                         to_move = 0;
6491                         goto out_of;
6492                 }
6493                 /* Pull off the data */
6494                 m_adj(sp->data, to_move);
6495                 /* Now lets work our way down and compact it */
6496                 m = sp->data;
6497                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6498                         sp->data = SCTP_BUF_NEXT(m);
6499                         SCTP_BUF_NEXT(m) = NULL;
6500                         if (sp->tail_mbuf == m) {
6501                                 /*-
6502                                  * Freeing tail? TSNH since
6503                                  * we supposedly were taking less
6504                                  * than the sp->length.
6505                                  */
6506 #ifdef INVARIANTS
6507                                 panic("Huh, freing tail? - TSNH");
6508 #else
6509                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6510                                 sp->tail_mbuf = sp->data = NULL;
6511                                 sp->length = 0;
6512 #endif
6513
6514                         }
6515                         sctp_m_free(m);
6516                         m = sp->data;
6517                 }
6518         }
6519         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6520                 chk->copy_by_ref = 1;
6521         } else {
6522                 chk->copy_by_ref = 0;
6523         }
6524         /*
6525          * get last_mbuf and counts of mb useage This is ugly but hopefully
6526          * its only one mbuf.
6527          */
6528         if (chk->last_mbuf == NULL) {
6529                 chk->last_mbuf = chk->data;
6530                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6531                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6532                 }
6533         }
6534         if (to_move > length) {
6535                 /*- This should not happen either
6536                  * since we always lower to_move to the size
6537                  * of sp->length if its larger.
6538                  */
6539 #ifdef INVARIANTS
6540                 panic("Huh, how can to_move be larger?");
6541 #else
6542                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6543                 sp->length = 0;
6544 #endif
6545         } else {
6546                 atomic_subtract_int(&sp->length, to_move);
6547         }
6548         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6549                 /* Not enough room for a chunk header, get some */
6550                 struct mbuf *m;
6551
6552                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6553                 if (m == NULL) {
6554                         /*
6555                          * we're in trouble here. _PREPEND below will free
6556                          * all the data if there is no leading space, so we
6557                          * must put the data back and restore.
6558                          */
6559                         if (send_lock_up == 0) {
6560                                 SCTP_TCB_SEND_LOCK(stcb);
6561                                 send_lock_up = 1;
6562                         }
6563                         if (chk->data == NULL) {
6564                                 /* unsteal the data */
6565                                 sp->data = chk->data;
6566                                 sp->tail_mbuf = chk->last_mbuf;
6567                         } else {
6568                                 struct mbuf *m_tmp;
6569
6570                                 /* reassemble the data */
6571                                 m_tmp = sp->data;
6572                                 sp->data = chk->data;
6573                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
6574                         }
6575                         sp->some_taken = some_taken;
6576                         atomic_add_int(&sp->length, to_move);
6577                         chk->data = NULL;
6578                         *bail = 1;
6579                         sctp_free_a_chunk(stcb, chk);
6580                         to_move = 0;
6581                         goto out_of;
6582                 } else {
6583                         SCTP_BUF_LEN(m) = 0;
6584                         SCTP_BUF_NEXT(m) = chk->data;
6585                         chk->data = m;
6586                         M_ALIGN(chk->data, 4);
6587                 }
6588         }
6589         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
6590         if (chk->data == NULL) {
6591                 /* HELP, TSNH since we assured it would not above? */
6592 #ifdef INVARIANTS
6593                 panic("prepend failes HELP?");
6594 #else
6595                 SCTP_PRINTF("prepend fails HELP?\n");
6596                 sctp_free_a_chunk(stcb, chk);
6597 #endif
6598                 *bail = 1;
6599                 to_move = 0;
6600                 goto out_of;
6601         }
6602         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
6603         chk->book_size = chk->send_size = (to_move +
6604             sizeof(struct sctp_data_chunk));
6605         chk->book_size_scale = 0;
6606         chk->sent = SCTP_DATAGRAM_UNSENT;
6607
6608         chk->flags = 0;
6609         chk->asoc = &stcb->asoc;
6610         chk->pad_inplace = 0;
6611         chk->no_fr_allowed = 0;
6612         chk->rec.data.stream_seq = sp->strseq;
6613         chk->rec.data.stream_number = sp->stream;
6614         chk->rec.data.payloadtype = sp->ppid;
6615         chk->rec.data.context = sp->context;
6616         chk->rec.data.doing_fast_retransmit = 0;
6617         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
6618
6619         chk->rec.data.timetodrop = sp->ts;
6620         chk->flags = sp->act_flags;
6621         chk->addr_over = sp->addr_over;
6622
6623         chk->whoTo = net;
6624         atomic_add_int(&chk->whoTo->ref_count, 1);
6625
6626         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
6627         if (sctp_logging_level & SCTP_LOG_AT_SEND_2_OUTQ) {
6628                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
6629                     (uintptr_t) stcb, sp->length,
6630                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
6631                     chk->rec.data.TSN_seq);
6632         }
6633         dchkh = mtod(chk->data, struct sctp_data_chunk *);
6634         /*
6635          * Put the rest of the things in place now. Size was done earlier in
6636          * previous loop prior to padding.
6637          */
6638
6639 #ifdef SCTP_ASOCLOG_OF_TSNS
6640         SCTP_TCB_LOCK_ASSERT(stcb);
6641         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
6642                 asoc->tsn_out_at = 0;
6643                 asoc->tsn_out_wrapped = 1;
6644         }
6645         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
6646         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
6647         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
6648         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
6649         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
6650         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
6651         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
6652         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
6653         asoc->tsn_out_at++;
6654 #endif
6655
6656         dchkh->ch.chunk_type = SCTP_DATA;
6657         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
6658         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
6659         dchkh->dp.stream_id = htons(strq->stream_no);
6660         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
6661         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
6662         dchkh->ch.chunk_length = htons(chk->send_size);
6663         /* Now advance the chk->send_size by the actual pad needed. */
6664         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
6665                 /* need a pad */
6666                 struct mbuf *lm;
6667                 int pads;
6668
6669                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
6670                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
6671                         chk->pad_inplace = 1;
6672                 }
6673                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
6674                         /* pad added an mbuf */
6675                         chk->last_mbuf = lm;
6676                 }
6677                 chk->send_size += pads;
6678         }
6679         /* We only re-set the policy if it is on */
6680         if (sp->pr_sctp_on) {
6681                 sctp_set_prsctp_policy(stcb, sp);
6682                 asoc->pr_sctp_cnt++;
6683                 chk->pr_sctp_on = 1;
6684         } else {
6685                 chk->pr_sctp_on = 0;
6686         }
6687         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
6688                 /* All done pull and kill the message */
6689                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6690                 if (sp->put_last_out == 0) {
6691                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
6692                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6693                             sp->sender_all_done,
6694                             sp->length,
6695                             sp->msg_is_complete,
6696                             sp->put_last_out,
6697                             send_lock_up);
6698                 }
6699                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
6700                         SCTP_TCB_SEND_LOCK(stcb);
6701                         send_lock_up = 1;
6702                 }
6703                 TAILQ_REMOVE(&strq->outqueue, sp, next);
6704                 sctp_free_remote_addr(sp->net);
6705                 if (sp->data) {
6706                         sctp_m_freem(sp->data);
6707                         sp->data = NULL;
6708                 }
6709                 sctp_free_a_strmoq(stcb, sp);
6710
6711                 /* we can't be locked to it */
6712                 *locked = 0;
6713                 stcb->asoc.locked_on_sending = NULL;
6714         } else {
6715                 /* more to go, we are locked */
6716                 *locked = 1;
6717         }
6718         asoc->chunks_on_out_queue++;
6719         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
6720         asoc->send_queue_cnt++;
6721 out_of:
6722         if (send_lock_up) {
6723                 SCTP_TCB_SEND_UNLOCK(stcb);
6724                 send_lock_up = 0;
6725         }
6726         return (to_move);
6727 }
6728
6729
6730 static struct sctp_stream_out *
6731 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
6732 {
6733         struct sctp_stream_out *strq;
6734
6735         /* Find the next stream to use */
6736         if (asoc->last_out_stream == NULL) {
6737                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
6738                 if (asoc->last_out_stream == NULL) {
6739                         /* huh nothing on the wheel, TSNH */
6740                         return (NULL);
6741                 }
6742                 goto done_it;
6743         }
6744         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
6745 done_it:
6746         if (strq == NULL) {
6747                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
6748         }
6749         /* Save off the last stream */
6750         asoc->last_out_stream = strq;
6751         return (strq);
6752
6753 }
6754
6755
6756 static void
6757 sctp_fill_outqueue(struct sctp_tcb *stcb,
6758     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
6759 {
6760         struct sctp_association *asoc;
6761         struct sctp_stream_out *strq, *strqn, *strqt;
6762         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
6763         int locked, giveup;
6764         struct sctp_stream_queue_pending *sp;
6765
6766         SCTP_TCB_LOCK_ASSERT(stcb);
6767         asoc = &stcb->asoc;
6768 #ifdef INET6
6769         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
6770                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
6771         } else {
6772                 /* ?? not sure what else to do */
6773                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
6774         }
6775 #else
6776         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
6777         mtu_fromwheel = 0;
6778 #endif
6779         /* Need an allowance for the data chunk header too */
6780         goal_mtu -= sizeof(struct sctp_data_chunk);
6781
6782         /* must make even word boundary */
6783         goal_mtu &= 0xfffffffc;
6784         if (asoc->locked_on_sending) {
6785                 /* We are stuck on one stream until the message completes. */
6786                 strqn = strq = asoc->locked_on_sending;
6787                 locked = 1;
6788         } else {
6789                 strqn = strq = sctp_select_a_stream(stcb, asoc);
6790                 locked = 0;
6791         }
6792
6793         while ((goal_mtu > 0) && strq) {
6794                 sp = TAILQ_FIRST(&strq->outqueue);
6795                 /*
6796                  * If CMT is off, we must validate that the stream in
6797                  * question has the first item pointed towards are network
6798                  * destionation requested by the caller. Note that if we
6799                  * turn out to be locked to a stream (assigning TSN's then
6800                  * we must stop, since we cannot look for another stream
6801                  * with data to send to that destination). In CMT's case, by
6802                  * skipping this check, we will send one data packet towards
6803                  * the requested net.
6804                  */
6805                 if (sp == NULL) {
6806                         break;
6807                 }
6808                 if ((sp->net != net) && (sctp_cmt_on_off == 0)) {
6809                         /* none for this network */
6810                         if (locked) {
6811                                 break;
6812                         } else {
6813                                 strq = sctp_select_a_stream(stcb, asoc);
6814                                 if (strq == NULL)
6815                                         /* none left */
6816                                         break;
6817                                 if (strqn == strq) {
6818                                         /* I have circled */
6819                                         break;
6820                                 }
6821                                 continue;
6822                         }
6823                 }
6824                 giveup = 0;
6825                 bail = 0;
6826                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
6827                     &giveup, eeor_mode, &bail);
6828                 asoc->last_out_stream = strq;
6829                 if (locked) {
6830                         asoc->locked_on_sending = strq;
6831                         if ((moved_how_much == 0) || (giveup) || bail)
6832                                 /* no more to move for now */
6833                                 break;
6834                 } else {
6835                         asoc->locked_on_sending = NULL;
6836                         strqt = sctp_select_a_stream(stcb, asoc);
6837                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
6838                                 if (strq == strqn) {
6839                                         /* Must move start to next one */
6840                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
6841                                         if (strqn == NULL) {
6842                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
6843                                                 if (strqn == NULL) {
6844                                                         break;
6845                                                 }
6846                                         }
6847                                 }
6848                                 sctp_remove_from_wheel(stcb, asoc, strq);
6849                         }
6850                         if ((giveup) || bail) {
6851                                 break;
6852                         }
6853                         strq = strqt;
6854                         if (strq == NULL) {
6855                                 break;
6856                         }
6857                 }
6858                 total_moved += moved_how_much;
6859                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
6860                 goal_mtu &= 0xfffffffc;
6861         }
6862         if (bail)
6863                 *quit_now = 1;
6864
6865         if (total_moved == 0) {
6866                 if ((sctp_cmt_on_off == 0) &&
6867                     (net == stcb->asoc.primary_destination)) {
6868                         /* ran dry for primary network net */
6869                         SCTP_STAT_INCR(sctps_primary_randry);
6870                 } else if (sctp_cmt_on_off) {
6871                         /* ran dry with CMT on */
6872                         SCTP_STAT_INCR(sctps_cmt_randry);
6873                 }
6874         }
6875 }
6876
6877 void
6878 sctp_fix_ecn_echo(struct sctp_association *asoc)
6879 {
6880         struct sctp_tmit_chunk *chk;
6881
6882         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
6883                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
6884                         chk->sent = SCTP_DATAGRAM_UNSENT;
6885                 }
6886         }
6887 }
6888
6889 static void
6890 sctp_move_to_an_alt(struct sctp_tcb *stcb,
6891     struct sctp_association *asoc,
6892     struct sctp_nets *net)
6893 {
6894         struct sctp_tmit_chunk *chk;
6895         struct sctp_nets *a_net;
6896
6897         SCTP_TCB_LOCK_ASSERT(stcb);
6898         /*
6899          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
6900          * destination using the PF algorithm for finding alternate
6901          * destinations.
6902          */
6903         if (sctp_cmt_on_off && sctp_cmt_pf) {
6904                 a_net = sctp_find_alternate_net(stcb, net, 2);
6905         } else {
6906                 a_net = sctp_find_alternate_net(stcb, net, 0);
6907         }
6908         if ((a_net != net) &&
6909             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
6910                 /*
6911                  * We only proceed if a valid alternate is found that is not
6912                  * this one and is reachable. Here we must move all chunks
6913                  * queued in the send queue off of the destination address
6914                  * to our alternate.
6915                  */
6916                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
6917                         if (chk->whoTo == net) {
6918                                 /* Move the chunk to our alternate */
6919                                 sctp_free_remote_addr(chk->whoTo);
6920                                 chk->whoTo = a_net;
6921                                 atomic_add_int(&a_net->ref_count, 1);
6922                         }
6923                 }
6924         }
6925 }
6926
6927 int
6928 sctp_med_chunk_output(struct sctp_inpcb *inp,
6929     struct sctp_tcb *stcb,
6930     struct sctp_association *asoc,
6931     int *num_out,
6932     int *reason_code,
6933     int control_only, int *cwnd_full, int from_where,
6934     struct timeval *now, int *now_filled, int frag_point, int so_locked
6935 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6936     SCTP_UNUSED
6937 #endif
6938 )
6939 {
6940         /*
6941          * Ok this is the generic chunk service queue. we must do the
6942          * following: - Service the stream queue that is next, moving any
6943          * message (note I must get a complete message i.e. FIRST/MIDDLE and
6944          * LAST to the out queue in one pass) and assigning TSN's - Check to
6945          * see if the cwnd/rwnd allows any output, if so we go ahead and
6946          * fomulate and send the low level chunks. Making sure to combine
6947          * any control in the control chunk queue also.
6948          */
6949         struct sctp_nets *net;
6950         struct mbuf *outchain, *endoutchain;
6951         struct sctp_tmit_chunk *chk, *nchk;
6952         struct sctphdr *shdr;
6953
6954         /* temp arrays for unlinking */
6955         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
6956         int no_fragmentflg, error;
6957         int one_chunk, hbflag, skip_data_for_this_net;
6958         int asconf, cookie, no_out_cnt;
6959         int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
6960         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
6961         struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
6962         int tsns_sent = 0;
6963         uint32_t auth_offset = 0;
6964         struct sctp_auth_chunk *auth = NULL;
6965
6966         /*
6967          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
6968          * destination.
6969          */
6970         int pf_hbflag = 0;
6971         int quit_now = 0;
6972
6973         *num_out = 0;
6974         cwnd_full_ind = 0;
6975
6976         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
6977             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
6978             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
6979                 eeor_mode = 1;
6980         } else {
6981                 eeor_mode = 0;
6982         }
6983         ctl_cnt = no_out_cnt = asconf = cookie = 0;
6984         /*
6985          * First lets prime the pump. For each destination, if there is room
6986          * in the flight size, attempt to pull an MTU's worth out of the
6987          * stream queues into the general send_queue
6988          */
6989 #ifdef SCTP_AUDITING_ENABLED
6990         sctp_audit_log(0xC2, 2);
6991 #endif
6992         SCTP_TCB_LOCK_ASSERT(stcb);
6993         hbflag = 0;
6994         if ((control_only) || (asoc->stream_reset_outstanding))
6995                 no_data_chunks = 1;
6996         else
6997                 no_data_chunks = 0;
6998
6999         /* Nothing to possible to send? */
7000         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7001             TAILQ_EMPTY(&asoc->send_queue) &&
7002             TAILQ_EMPTY(&asoc->out_wheel)) {
7003                 *reason_code = 9;
7004                 return (0);
7005         }
7006         if (asoc->peers_rwnd == 0) {
7007                 /* No room in peers rwnd */
7008                 *cwnd_full = 1;
7009                 *reason_code = 1;
7010                 if (asoc->total_flight > 0) {
7011                         /* we are allowed one chunk in flight */
7012                         no_data_chunks = 1;
7013                 }
7014         }
7015         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7016                 if (sctp_cmt_on_off) {
7017                         /*
7018                          * for CMT we start at the next one past the one we
7019                          * last added data to.
7020                          */
7021                         if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
7022                                 goto skip_the_fill_from_streams;
7023                         }
7024                         if (asoc->last_net_data_came_from) {
7025                                 net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
7026                                 if (net == NULL) {
7027                                         net = TAILQ_FIRST(&asoc->nets);
7028                                 }
7029                         } else {
7030                                 /* back to start */
7031                                 net = TAILQ_FIRST(&asoc->nets);
7032                         }
7033
7034                         /*
7035                          * JRI-TODO: CMT-MPI. Simply set the first
7036                          * destination (net) to be optimized for the next
7037                          * message to be pulled out of the outwheel. 1. peek
7038                          * at outwheel 2. If large message, set net =
7039                          * highest_cwnd 3. If small message, set net =
7040                          * lowest rtt
7041                          */
7042                 } else {
7043                         net = asoc->primary_destination;
7044                         if (net == NULL) {
7045                                 /* TSNH */
7046                                 net = TAILQ_FIRST(&asoc->nets);
7047                         }
7048                 }
7049                 start_at = net;
7050
7051 one_more_time:
7052                 for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7053                         net->window_probe = 0;
7054                         if (old_startat && (old_startat == net)) {
7055                                 break;
7056                         }
7057                         /*
7058                          * JRI: if dest is unreachable or unconfirmed, do
7059                          * not send data to it
7060                          */
7061                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7062                                 continue;
7063                         }
7064                         /*
7065                          * JRI: if dest is in PF state, do not send data to
7066                          * it
7067                          */
7068                         if (sctp_cmt_on_off && sctp_cmt_pf && (net->dest_state & SCTP_ADDR_PF)) {
7069                                 continue;
7070                         }
7071                         if ((sctp_cmt_on_off == 0) && (net->ref_count < 2)) {
7072                                 /* nothing can be in queue for this guy */
7073                                 continue;
7074                         }
7075                         if (net->flight_size >= net->cwnd) {
7076                                 /* skip this network, no room */
7077                                 cwnd_full_ind++;
7078                                 continue;
7079                         }
7080                         /*
7081                          * JRI : this for loop we are in takes in each net,
7082                          * if its's got space in cwnd and has data sent to
7083                          * it (when CMT is off) then it calls
7084                          * sctp_fill_outqueue for the net. This gets data on
7085                          * the send queue for that network.
7086                          *
7087                          * In sctp_fill_outqueue TSN's are assigned and data is
7088                          * copied out of the stream buffers. Note mostly
7089                          * copy by reference (we hope).
7090                          */
7091                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7092                                 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7093                         }
7094                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7095                         if (quit_now) {
7096                                 /* memory alloc failure */
7097                                 no_data_chunks = 1;
7098                                 goto skip_the_fill_from_streams;
7099                         }
7100                 }
7101                 if (start_at != TAILQ_FIRST(&asoc->nets)) {
7102                         /* got to pick up the beginning stuff. */
7103                         old_startat = start_at;
7104                         start_at = net = TAILQ_FIRST(&asoc->nets);
7105                         if (old_startat)
7106                                 goto one_more_time;
7107                 }
7108         }
7109 skip_the_fill_from_streams:
7110         *cwnd_full = cwnd_full_ind;
7111
7112         /* now service each destination and send out what we can for it */
7113         /* Nothing to send? */
7114         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7115             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7116                 *reason_code = 8;
7117                 return (0);
7118         }
7119         if (no_data_chunks) {
7120                 chk = TAILQ_FIRST(&asoc->control_send_queue);
7121         } else {
7122                 chk = TAILQ_FIRST(&asoc->send_queue);
7123         }
7124         if (chk) {
7125                 send_start_at = chk->whoTo;
7126         } else {
7127                 send_start_at = TAILQ_FIRST(&asoc->nets);
7128         }
7129         old_startat = NULL;
7130 again_one_more_time:
7131         for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7132                 /* how much can we send? */
7133                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7134                 if (old_startat && (old_startat == net)) {
7135                         /* through list ocmpletely. */
7136                         break;
7137                 }
7138                 tsns_sent = 0;
7139                 if (net->ref_count < 2) {
7140                         /*
7141                          * Ref-count of 1 so we cannot have data or control
7142                          * queued to this address. Skip it.
7143                          */
7144                         continue;
7145                 }
7146                 ctl_cnt = bundle_at = 0;
7147                 endoutchain = outchain = NULL;
7148                 no_fragmentflg = 1;
7149                 one_chunk = 0;
7150                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7151                         skip_data_for_this_net = 1;
7152                 } else {
7153                         skip_data_for_this_net = 0;
7154                 }
7155                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7156                         /*
7157                          * if we have a route and an ifp check to see if we
7158                          * have room to send to this guy
7159                          */
7160                         struct ifnet *ifp;
7161
7162                         ifp = net->ro.ro_rt->rt_ifp;
7163                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7164                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7165                                 if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
7166                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7167                                 }
7168                                 continue;
7169                         }
7170                 }
7171                 if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
7172                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7173                 } else {
7174                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7175                 }
7176                 mx_mtu = mtu;
7177                 to_out = 0;
7178                 if (mtu > asoc->peers_rwnd) {
7179                         if (asoc->total_flight > 0) {
7180                                 /* We have a packet in flight somewhere */
7181                                 r_mtu = asoc->peers_rwnd;
7182                         } else {
7183                                 /* We are always allowed to send one MTU out */
7184                                 one_chunk = 1;
7185                                 r_mtu = mtu;
7186                         }
7187                 } else {
7188                         r_mtu = mtu;
7189                 }
7190                 /************************/
7191                 /* Control transmission */
7192                 /************************/
7193                 /* Now first lets go through the control queue */
7194                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7195                     chk; chk = nchk) {
7196                         nchk = TAILQ_NEXT(chk, sctp_next);
7197                         if (chk->whoTo != net) {
7198                                 /*
7199                                  * No, not sent to the network we are
7200                                  * looking at
7201                                  */
7202                                 continue;
7203                         }
7204                         if (chk->data == NULL) {
7205                                 continue;
7206                         }
7207                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7208                                 /*
7209                                  * It must be unsent. Cookies and ASCONF's
7210                                  * hang around but there timers will force
7211                                  * when marked for resend.
7212                                  */
7213                                 continue;
7214                         }
7215                         /*
7216                          * if no AUTH is yet included and this chunk
7217                          * requires it, make sure to account for it.  We
7218                          * don't apply the size until the AUTH chunk is
7219                          * actually added below in case there is no room for
7220                          * this chunk. NOTE: we overload the use of "omtu"
7221                          * here
7222                          */
7223                         if ((auth == NULL) &&
7224                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7225                             stcb->asoc.peer_auth_chunks)) {
7226                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7227                         } else
7228                                 omtu = 0;
7229                         /* Here we do NOT factor the r_mtu */
7230                         if ((chk->send_size < (int)(mtu - omtu)) ||
7231                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7232                                 /*
7233                                  * We probably should glom the mbuf chain
7234                                  * from the chk->data for control but the
7235                                  * problem is it becomes yet one more level
7236                                  * of tracking to do if for some reason
7237                                  * output fails. Then I have got to
7238                                  * reconstruct the merged control chain.. el
7239                                  * yucko.. for now we take the easy way and
7240                                  * do the copy
7241                                  */
7242                                 /*
7243                                  * Add an AUTH chunk, if chunk requires it
7244                                  * save the offset into the chain for AUTH
7245                                  */
7246                                 if ((auth == NULL) &&
7247                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7248                                     stcb->asoc.peer_auth_chunks))) {
7249                                         outchain = sctp_add_auth_chunk(outchain,
7250                                             &endoutchain,
7251                                             &auth,
7252                                             &auth_offset,
7253                                             stcb,
7254                                             chk->rec.chunk_id.id);
7255                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7256                                 }
7257                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7258                                     (int)chk->rec.chunk_id.can_take_data,
7259                                     chk->send_size, chk->copy_by_ref);
7260                                 if (outchain == NULL) {
7261                                         *reason_code = 8;
7262                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7263                                         return (ENOMEM);
7264                                 }
7265                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7266                                 /* update our MTU size */
7267                                 if (mtu > (chk->send_size + omtu))
7268                                         mtu -= (chk->send_size + omtu);
7269                                 else
7270                                         mtu = 0;
7271                                 to_out += (chk->send_size + omtu);
7272                                 /* Do clear IP_DF ? */
7273                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7274                                         no_fragmentflg = 0;
7275                                 }
7276                                 if (chk->rec.chunk_id.can_take_data)
7277                                         chk->data = NULL;
7278                                 /* Mark things to be removed, if needed */
7279                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7280                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7281                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7282                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7283                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7284                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7285                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7286                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7287                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7288                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7289
7290                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7291                                                 hbflag = 1;
7292                                                 /*
7293                                                  * JRS 5/14/07 - Set the
7294                                                  * flag to say a heartbeat
7295                                                  * is being sent.
7296                                                  */
7297                                                 pf_hbflag = 1;
7298                                         }
7299                                         /* remove these chunks at the end */
7300                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7301                                                 /* turn off the timer */
7302                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7303                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7304                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7305                                                 }
7306                                         }
7307                                         ctl_cnt++;
7308                                 } else {
7309                                         /*
7310                                          * Other chunks, since they have
7311                                          * timers running (i.e. COOKIE or
7312                                          * ASCONF) we just "trust" that it
7313                                          * gets sent or retransmitted.
7314                                          */
7315                                         ctl_cnt++;
7316                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7317                                                 cookie = 1;
7318                                                 no_out_cnt = 1;
7319                                         } else if (chk->rec.chunk_id.id == SCTP_ASCONF) {
7320                                                 /*
7321                                                  * set hb flag since we can
7322                                                  * use these for RTO
7323                                                  */
7324                                                 hbflag = 1;
7325                                                 asconf = 1;
7326                                                 /*
7327                                                  * should sysctl this: don't
7328                                                  * bundle data with ASCONF
7329                                                  * since it requires AUTH
7330                                                  */
7331                                                 no_data_chunks = 1;
7332                                         }
7333                                         chk->sent = SCTP_DATAGRAM_SENT;
7334                                         chk->snd_count++;
7335                                 }
7336                                 if (mtu == 0) {
7337                                         /*
7338                                          * Ok we are out of room but we can
7339                                          * output without effecting the
7340                                          * flight size since this little guy
7341                                          * is a control only packet.
7342                                          */
7343                                         if (asconf) {
7344                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7345                                                 /*
7346                                                  * do NOT clear the asconf
7347                                                  * flag as it is used to do
7348                                                  * appropriate source
7349                                                  * address selection.
7350                                                  */
7351                                         }
7352                                         if (cookie) {
7353                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7354                                                 cookie = 0;
7355                                         }
7356                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7357                                         if (outchain == NULL) {
7358                                                 /* no memory */
7359                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7360                                                 error = ENOBUFS;
7361                                                 goto error_out_again;
7362                                         }
7363                                         shdr = mtod(outchain, struct sctphdr *);
7364                                         shdr->src_port = inp->sctp_lport;
7365                                         shdr->dest_port = stcb->rport;
7366                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7367                                         shdr->checksum = 0;
7368                                         auth_offset += sizeof(struct sctphdr);
7369                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7370                                             (struct sockaddr *)&net->ro._l_addr,
7371                                             outchain, auth_offset, auth,
7372                                             no_fragmentflg, 0, NULL, asconf, so_locked))) {
7373                                                 if (error == ENOBUFS) {
7374                                                         asoc->ifp_had_enobuf = 1;
7375                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7376                                                 }
7377                                                 if (from_where == 0) {
7378                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7379                                                 }
7380                                 error_out_again:
7381                                                 /* error, could not output */
7382                                                 if (hbflag) {
7383                                                         if (*now_filled == 0) {
7384                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7385                                                                 *now_filled = 1;
7386                                                                 *now = net->last_sent_time;
7387                                                         } else {
7388                                                                 net->last_sent_time = *now;
7389                                                         }
7390                                                         hbflag = 0;
7391                                                 }
7392                                                 if (error == EHOSTUNREACH) {
7393                                                         /*
7394                                                          * Destination went
7395                                                          * unreachable
7396                                                          * during this send
7397                                                          */
7398                                                         sctp_move_to_an_alt(stcb, asoc, net);
7399                                                 }
7400                                                 *reason_code = 7;
7401                                                 continue;
7402                                         } else
7403                                                 asoc->ifp_had_enobuf = 0;
7404                                         /* Only HB or ASCONF advances time */
7405                                         if (hbflag) {
7406                                                 if (*now_filled == 0) {
7407                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7408                                                         *now_filled = 1;
7409                                                         *now = net->last_sent_time;
7410                                                 } else {
7411                                                         net->last_sent_time = *now;
7412                                                 }
7413                                                 hbflag = 0;
7414                                         }
7415                                         /*
7416                                          * increase the number we sent, if a
7417                                          * cookie is sent we don't tell them
7418                                          * any was sent out.
7419                                          */
7420                                         outchain = endoutchain = NULL;
7421                                         auth = NULL;
7422                                         auth_offset = 0;
7423                                         if (!no_out_cnt)
7424                                                 *num_out += ctl_cnt;
7425                                         /* recalc a clean slate and setup */
7426                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7427                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7428                                         } else {
7429                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7430                                         }
7431                                         to_out = 0;
7432                                         no_fragmentflg = 1;
7433                                 }
7434                         }
7435                 }
7436                 /*********************/
7437                 /* Data transmission */
7438                 /*********************/
7439                 /*
7440                  * if AUTH for DATA is required and no AUTH has been added
7441                  * yet, account for this in the mtu now... if no data can be
7442                  * bundled, this adjustment won't matter anyways since the
7443                  * packet will be going out...
7444                  */
7445                 if ((auth == NULL) &&
7446                     sctp_auth_is_required_chunk(SCTP_DATA,
7447                     stcb->asoc.peer_auth_chunks)) {
7448                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7449                 }
7450                 /* now lets add any data within the MTU constraints */
7451                 if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
7452                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
7453                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7454                         else
7455                                 omtu = 0;
7456                 } else {
7457                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
7458                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7459                         else
7460                                 omtu = 0;
7461                 }
7462                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) && (skip_data_for_this_net == 0)) ||
7463                     (cookie)) {
7464                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
7465                                 if (no_data_chunks) {
7466                                         /* let only control go out */
7467                                         *reason_code = 1;
7468                                         break;
7469                                 }
7470                                 if (net->flight_size >= net->cwnd) {
7471                                         /* skip this net, no room for data */
7472                                         *reason_code = 2;
7473                                         break;
7474                                 }
7475                                 nchk = TAILQ_NEXT(chk, sctp_next);
7476                                 if (chk->whoTo != net) {
7477                                         /* No, not sent to this net */
7478                                         continue;
7479                                 }
7480                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
7481                                         /*-
7482                                          * strange, we have a chunk that is
7483                                          * to big for its destination and
7484                                          * yet no fragment ok flag.
7485                                          * Something went wrong when the
7486                                          * PMTU changed...we did not mark
7487                                          * this chunk for some reason?? I
7488                                          * will fix it here by letting IP
7489                                          * fragment it for now and printing
7490                                          * a warning. This really should not
7491                                          * happen ...
7492                                          */
7493                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
7494                                             chk->send_size, mtu);
7495                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
7496                                 }
7497                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
7498                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
7499                                         /* ok we will add this one */
7500
7501                                         /*
7502                                          * Add an AUTH chunk, if chunk
7503                                          * requires it, save the offset into
7504                                          * the chain for AUTH
7505                                          */
7506                                         if ((auth == NULL) &&
7507                                             (sctp_auth_is_required_chunk(SCTP_DATA,
7508                                             stcb->asoc.peer_auth_chunks))) {
7509
7510                                                 outchain = sctp_add_auth_chunk(outchain,
7511                                                     &endoutchain,
7512                                                     &auth,
7513                                                     &auth_offset,
7514                                                     stcb,
7515                                                     SCTP_DATA);
7516                                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7517                                         }
7518                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
7519                                             chk->send_size, chk->copy_by_ref);
7520                                         if (outchain == NULL) {
7521                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
7522                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
7523                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7524                                                 }
7525                                                 *reason_code = 3;
7526                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7527                                                 return (ENOMEM);
7528                                         }
7529                                         /* upate our MTU size */
7530                                         /* Do clear IP_DF ? */
7531                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7532                                                 no_fragmentflg = 0;
7533                                         }
7534                                         /* unsigned subtraction of mtu */
7535                                         if (mtu > chk->send_size)
7536                                                 mtu -= chk->send_size;
7537                                         else
7538                                                 mtu = 0;
7539                                         /* unsigned subtraction of r_mtu */
7540                                         if (r_mtu > chk->send_size)
7541                                                 r_mtu -= chk->send_size;
7542                                         else
7543                                                 r_mtu = 0;
7544
7545                                         to_out += chk->send_size;
7546                                         if ((to_out > mx_mtu) && no_fragmentflg) {
7547 #ifdef INVARIANTS
7548                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
7549 #else
7550                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
7551                                                     mx_mtu, to_out);
7552 #endif
7553                                         }
7554                                         chk->window_probe = 0;
7555                                         data_list[bundle_at++] = chk;
7556                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
7557                                                 mtu = 0;
7558                                                 break;
7559                                         }
7560                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
7561                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
7562                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
7563                                                 } else {
7564                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
7565                                                 }
7566                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
7567                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
7568                                                         /*
7569                                                          * Count number of
7570                                                          * user msg's that
7571                                                          * were fragmented
7572                                                          * we do this by
7573                                                          * counting when we
7574                                                          * see a LAST
7575                                                          * fragment only.
7576                                                          */
7577                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
7578                                         }
7579                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
7580                                                 if (one_chunk) {
7581                                                         data_list[0]->window_probe = 1;
7582                                                         net->window_probe = 1;
7583                                                 }
7584                                                 break;
7585                                         }
7586                                 } else {
7587                                         /*
7588                                          * Must be sent in order of the
7589                                          * TSN's (on a network)
7590                                          */
7591                                         break;
7592                                 }
7593                         }       /* for (chunk gather loop for this net) */
7594                 }               /* if asoc.state OPEN */
7595                 /* Is there something to send for this destination? */
7596                 if (outchain) {
7597                         /* We may need to start a control timer or two */
7598                         if (asconf) {
7599                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
7600                                     stcb, net);
7601                                 /*
7602                                  * do NOT clear the asconf flag as it is
7603                                  * used to do appropriate source address
7604                                  * selection.
7605                                  */
7606                         }
7607                         if (cookie) {
7608                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7609                                 cookie = 0;
7610                         }
7611                         /* must start a send timer if data is being sent */
7612                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
7613                                 /*
7614                                  * no timer running on this destination
7615                                  * restart it.
7616                                  */
7617                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7618                         } else if (sctp_cmt_on_off && sctp_cmt_pf && pf_hbflag && ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)
7619                             && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
7620                                 /*
7621                                  * JRS 5/14/07 - If a HB has been sent to a
7622                                  * PF destination and no T3 timer is
7623                                  * currently running, start the T3 timer to
7624                                  * track the HBs that were sent.
7625                                  */
7626                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7627                         }
7628                         /* Now send it, if there is anything to send :> */
7629                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7630                         if (outchain == NULL) {
7631                                 /* out of mbufs */
7632                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7633                                 error = ENOBUFS;
7634                                 goto errored_send;
7635                         }
7636                         shdr = mtod(outchain, struct sctphdr *);
7637                         shdr->src_port = inp->sctp_lport;
7638                         shdr->dest_port = stcb->rport;
7639                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7640                         shdr->checksum = 0;
7641                         auth_offset += sizeof(struct sctphdr);
7642                         if ((error = sctp_lowlevel_chunk_output(inp,
7643                             stcb,
7644                             net,
7645                             (struct sockaddr *)&net->ro._l_addr,
7646                             outchain,
7647                             auth_offset,
7648                             auth,
7649                             no_fragmentflg,
7650                             bundle_at,
7651                             data_list[0],
7652                             asconf, so_locked))) {
7653                                 /* error, we could not output */
7654                                 if (error == ENOBUFS) {
7655                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7656                                         asoc->ifp_had_enobuf = 1;
7657                                 }
7658                                 if (from_where == 0) {
7659                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7660                                 }
7661                 errored_send:
7662                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
7663                                 if (hbflag) {
7664                                         if (*now_filled == 0) {
7665                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7666                                                 *now_filled = 1;
7667                                                 *now = net->last_sent_time;
7668                                         } else {
7669                                                 net->last_sent_time = *now;
7670                                         }
7671                                         hbflag = 0;
7672                                 }
7673                                 if (error == EHOSTUNREACH) {
7674                                         /*
7675                                          * Destination went unreachable
7676                                          * during this send
7677                                          */
7678                                         sctp_move_to_an_alt(stcb, asoc, net);
7679                                 }
7680                                 *reason_code = 6;
7681                                 /*-
7682                                  * I add this line to be paranoid. As far as
7683                                  * I can tell the continue, takes us back to
7684                                  * the top of the for, but just to make sure
7685                                  * I will reset these again here.
7686                                  */
7687                                 ctl_cnt = bundle_at = 0;
7688                                 continue;       /* This takes us back to the
7689                                                  * for() for the nets. */
7690                         } else {
7691                                 asoc->ifp_had_enobuf = 0;
7692                         }
7693                         outchain = endoutchain = NULL;
7694                         auth = NULL;
7695                         auth_offset = 0;
7696                         if (bundle_at || hbflag) {
7697                                 /* For data/asconf and hb set time */
7698                                 if (*now_filled == 0) {
7699                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7700                                         *now_filled = 1;
7701                                         *now = net->last_sent_time;
7702                                 } else {
7703                                         net->last_sent_time = *now;
7704                                 }
7705                         }
7706                         if (!no_out_cnt) {
7707                                 *num_out += (ctl_cnt + bundle_at);
7708                         }
7709                         if (bundle_at) {
7710                                 /* setup for a RTO measurement */
7711                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
7712                                 /* fill time if not already filled */
7713                                 if (*now_filled == 0) {
7714                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
7715                                         *now_filled = 1;
7716                                         *now = asoc->time_last_sent;
7717                                 } else {
7718                                         asoc->time_last_sent = *now;
7719                                 }
7720                                 data_list[0]->do_rtt = 1;
7721                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
7722                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
7723                                 if (sctp_early_fr) {
7724                                         if (net->flight_size < net->cwnd) {
7725                                                 /* start or restart it */
7726                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
7727                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
7728                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
7729                                                 }
7730                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
7731                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
7732                                         } else {
7733                                                 /* stop it if its running */
7734                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
7735                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
7736                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
7737                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
7738                                                 }
7739                                         }
7740                                 }
7741                         }
7742                         if (one_chunk) {
7743                                 break;
7744                         }
7745                 }
7746                 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7747                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
7748                 }
7749         }
7750         if (old_startat == NULL) {
7751                 old_startat = send_start_at;
7752                 send_start_at = TAILQ_FIRST(&asoc->nets);
7753                 if (old_startat)
7754                         goto again_one_more_time;
7755         }
7756         /*
7757          * At the end there should be no NON timed chunks hanging on this
7758          * queue.
7759          */
7760         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7761                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
7762         }
7763         if ((*num_out == 0) && (*reason_code == 0)) {
7764                 *reason_code = 4;
7765         } else {
7766                 *reason_code = 5;
7767         }
7768         sctp_clean_up_ctl(stcb, asoc);
7769         return (0);
7770 }
7771
7772 void
7773 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
7774 {
7775         /*-
7776          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
7777          * the control chunk queue.
7778          */
7779         struct sctp_chunkhdr *hdr;
7780         struct sctp_tmit_chunk *chk;
7781         struct mbuf *mat;
7782
7783         SCTP_TCB_LOCK_ASSERT(stcb);
7784         sctp_alloc_a_chunk(stcb, chk);
7785         if (chk == NULL) {
7786                 /* no memory */
7787                 sctp_m_freem(op_err);
7788                 return;
7789         }
7790         chk->copy_by_ref = 0;
7791         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
7792         if (op_err == NULL) {
7793                 sctp_free_a_chunk(stcb, chk);
7794                 return;
7795         }
7796         chk->send_size = 0;
7797         mat = op_err;
7798         while (mat != NULL) {
7799                 chk->send_size += SCTP_BUF_LEN(mat);
7800                 mat = SCTP_BUF_NEXT(mat);
7801         }
7802         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
7803         chk->rec.chunk_id.can_take_data = 1;
7804         chk->sent = SCTP_DATAGRAM_UNSENT;
7805         chk->snd_count = 0;
7806         chk->flags = 0;
7807         chk->asoc = &stcb->asoc;
7808         chk->data = op_err;
7809         chk->whoTo = chk->asoc->primary_destination;
7810         atomic_add_int(&chk->whoTo->ref_count, 1);
7811         hdr = mtod(op_err, struct sctp_chunkhdr *);
7812         hdr->chunk_type = SCTP_OPERATION_ERROR;
7813         hdr->chunk_flags = 0;
7814         hdr->chunk_length = htons(chk->send_size);
7815         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
7816             chk,
7817             sctp_next);
7818         chk->asoc->ctrl_queue_cnt++;
7819 }
7820
7821 int
7822 sctp_send_cookie_echo(struct mbuf *m,
7823     int offset,
7824     struct sctp_tcb *stcb,
7825     struct sctp_nets *net)
7826 {
7827         /*-
7828          * pull out the cookie and put it at the front of the control chunk
7829          * queue.
7830          */
7831         int at;
7832         struct mbuf *cookie;
7833         struct sctp_paramhdr parm, *phdr;
7834         struct sctp_chunkhdr *hdr;
7835         struct sctp_tmit_chunk *chk;
7836         uint16_t ptype, plen;
7837
7838         /* First find the cookie in the param area */
7839         cookie = NULL;
7840         at = offset + sizeof(struct sctp_init_chunk);
7841
7842         SCTP_TCB_LOCK_ASSERT(stcb);
7843         do {
7844                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
7845                 if (phdr == NULL) {
7846                         return (-3);
7847                 }
7848                 ptype = ntohs(phdr->param_type);
7849                 plen = ntohs(phdr->param_length);
7850                 if (ptype == SCTP_STATE_COOKIE) {
7851                         int pad;
7852
7853                         /* found the cookie */
7854                         if ((pad = (plen % 4))) {
7855                                 plen += 4 - pad;
7856                         }
7857                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
7858                         if (cookie == NULL) {
7859                                 /* No memory */
7860                                 return (-2);
7861                         }
7862                         break;
7863                 }
7864                 at += SCTP_SIZE32(plen);
7865         } while (phdr);
7866         if (cookie == NULL) {
7867                 /* Did not find the cookie */
7868                 return (-3);
7869         }
7870         /* ok, we got the cookie lets change it into a cookie echo chunk */
7871
7872         /* first the change from param to cookie */
7873         hdr = mtod(cookie, struct sctp_chunkhdr *);
7874         hdr->chunk_type = SCTP_COOKIE_ECHO;
7875         hdr->chunk_flags = 0;
7876         /* get the chunk stuff now and place it in the FRONT of the queue */
7877         sctp_alloc_a_chunk(stcb, chk);
7878         if (chk == NULL) {
7879                 /* no memory */
7880                 sctp_m_freem(cookie);
7881                 return (-5);
7882         }
7883         chk->copy_by_ref = 0;
7884         chk->send_size = plen;
7885         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
7886         chk->rec.chunk_id.can_take_data = 0;
7887         chk->sent = SCTP_DATAGRAM_UNSENT;
7888         chk->snd_count = 0;
7889         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
7890         chk->asoc = &stcb->asoc;
7891         chk->data = cookie;
7892         chk->whoTo = chk->asoc->primary_destination;
7893         atomic_add_int(&chk->whoTo->ref_count, 1);
7894         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
7895         chk->asoc->ctrl_queue_cnt++;
7896         return (0);
7897 }
7898
7899 void
7900 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
7901     struct mbuf *m,
7902     int offset,
7903     int chk_length,
7904     struct sctp_nets *net)
7905 {
7906         /*
7907          * take a HB request and make it into a HB ack and send it.
7908          */
7909         struct mbuf *outchain;
7910         struct sctp_chunkhdr *chdr;
7911         struct sctp_tmit_chunk *chk;
7912
7913
7914         if (net == NULL)
7915                 /* must have a net pointer */
7916                 return;
7917
7918         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
7919         if (outchain == NULL) {
7920                 /* gak out of memory */
7921                 return;
7922         }
7923         chdr = mtod(outchain, struct sctp_chunkhdr *);
7924         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
7925         chdr->chunk_flags = 0;
7926         if (chk_length % 4) {
7927                 /* need pad */
7928                 uint32_t cpthis = 0;
7929                 int padlen;
7930
7931                 padlen = 4 - (chk_length % 4);
7932                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
7933         }
7934         sctp_alloc_a_chunk(stcb, chk);
7935         if (chk == NULL) {
7936                 /* no memory */
7937                 sctp_m_freem(outchain);
7938                 return;
7939         }
7940         chk->copy_by_ref = 0;
7941         chk->send_size = chk_length;
7942         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
7943         chk->rec.chunk_id.can_take_data = 1;
7944         chk->sent = SCTP_DATAGRAM_UNSENT;
7945         chk->snd_count = 0;
7946         chk->flags = 0;
7947         chk->asoc = &stcb->asoc;
7948         chk->data = outchain;
7949         chk->whoTo = net;
7950         atomic_add_int(&chk->whoTo->ref_count, 1);
7951         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
7952         chk->asoc->ctrl_queue_cnt++;
7953 }
7954
7955 void
7956 sctp_send_cookie_ack(struct sctp_tcb *stcb)
7957 {
7958         /* formulate and queue a cookie-ack back to sender */
7959         struct mbuf *cookie_ack;
7960         struct sctp_chunkhdr *hdr;
7961         struct sctp_tmit_chunk *chk;
7962
7963         cookie_ack = NULL;
7964         SCTP_TCB_LOCK_ASSERT(stcb);
7965
7966         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
7967         if (cookie_ack == NULL) {
7968                 /* no mbuf's */
7969                 return;
7970         }
7971         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
7972         sctp_alloc_a_chunk(stcb, chk);
7973         if (chk == NULL) {
7974                 /* no memory */
7975                 sctp_m_freem(cookie_ack);
7976                 return;
7977         }
7978         chk->copy_by_ref = 0;
7979         chk->send_size = sizeof(struct sctp_chunkhdr);
7980         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
7981         chk->rec.chunk_id.can_take_data = 1;
7982         chk->sent = SCTP_DATAGRAM_UNSENT;
7983         chk->snd_count = 0;
7984         chk->flags = 0;
7985         chk->asoc = &stcb->asoc;
7986         chk->data = cookie_ack;
7987         if (chk->asoc->last_control_chunk_from != NULL) {
7988                 chk->whoTo = chk->asoc->last_control_chunk_from;
7989         } else {
7990                 chk->whoTo = chk->asoc->primary_destination;
7991         }
7992         atomic_add_int(&chk->whoTo->ref_count, 1);
7993         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
7994         hdr->chunk_type = SCTP_COOKIE_ACK;
7995         hdr->chunk_flags = 0;
7996         hdr->chunk_length = htons(chk->send_size);
7997         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
7998         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
7999         chk->asoc->ctrl_queue_cnt++;
8000         return;
8001 }
8002
8003
8004 void
8005 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8006 {
8007         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8008         struct mbuf *m_shutdown_ack;
8009         struct sctp_shutdown_ack_chunk *ack_cp;
8010         struct sctp_tmit_chunk *chk;
8011
8012         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8013         if (m_shutdown_ack == NULL) {
8014                 /* no mbuf's */
8015                 return;
8016         }
8017         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8018         sctp_alloc_a_chunk(stcb, chk);
8019         if (chk == NULL) {
8020                 /* no memory */
8021                 sctp_m_freem(m_shutdown_ack);
8022                 return;
8023         }
8024         chk->copy_by_ref = 0;
8025         chk->send_size = sizeof(struct sctp_chunkhdr);
8026         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8027         chk->rec.chunk_id.can_take_data = 1;
8028         chk->sent = SCTP_DATAGRAM_UNSENT;
8029         chk->snd_count = 0;
8030         chk->flags = 0;
8031         chk->asoc = &stcb->asoc;
8032         chk->data = m_shutdown_ack;
8033         chk->whoTo = net;
8034         atomic_add_int(&net->ref_count, 1);
8035
8036         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8037         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8038         ack_cp->ch.chunk_flags = 0;
8039         ack_cp->ch.chunk_length = htons(chk->send_size);
8040         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8041         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8042         chk->asoc->ctrl_queue_cnt++;
8043         return;
8044 }
8045
8046 void
8047 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8048 {
8049         /* formulate and queue a SHUTDOWN to the sender */
8050         struct mbuf *m_shutdown;
8051         struct sctp_shutdown_chunk *shutdown_cp;
8052         struct sctp_tmit_chunk *chk;
8053
8054         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8055         if (m_shutdown == NULL) {
8056                 /* no mbuf's */
8057                 return;
8058         }
8059         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8060         sctp_alloc_a_chunk(stcb, chk);
8061         if (chk == NULL) {
8062                 /* no memory */
8063                 sctp_m_freem(m_shutdown);
8064                 return;
8065         }
8066         chk->copy_by_ref = 0;
8067         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8068         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8069         chk->rec.chunk_id.can_take_data = 1;
8070         chk->sent = SCTP_DATAGRAM_UNSENT;
8071         chk->snd_count = 0;
8072         chk->flags = 0;
8073         chk->asoc = &stcb->asoc;
8074         chk->data = m_shutdown;
8075         chk->whoTo = net;
8076         atomic_add_int(&net->ref_count, 1);
8077
8078         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8079         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8080         shutdown_cp->ch.chunk_flags = 0;
8081         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8082         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8083         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8084         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8085         chk->asoc->ctrl_queue_cnt++;
8086         return;
8087 }
8088
8089 void
8090 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8091 {
8092         /*
8093          * formulate and queue an ASCONF to the peer. ASCONF parameters
8094          * should be queued on the assoc queue.
8095          */
8096         struct sctp_tmit_chunk *chk;
8097         struct mbuf *m_asconf;
8098         struct sctp_asconf_chunk *acp;
8099         int len;
8100
8101         SCTP_TCB_LOCK_ASSERT(stcb);
8102         /* compose an ASCONF chunk, maximum length is PMTU */
8103         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8104         if (m_asconf == NULL) {
8105                 return;
8106         }
8107         acp = mtod(m_asconf, struct sctp_asconf_chunk *);
8108         sctp_alloc_a_chunk(stcb, chk);
8109         if (chk == NULL) {
8110                 /* no memory */
8111                 sctp_m_freem(m_asconf);
8112                 return;
8113         }
8114         chk->copy_by_ref = 0;
8115         chk->data = m_asconf;
8116         chk->send_size = len;
8117         chk->rec.chunk_id.id = SCTP_ASCONF;
8118         chk->rec.chunk_id.can_take_data = 0;
8119         chk->sent = SCTP_DATAGRAM_UNSENT;
8120         chk->snd_count = 0;
8121         chk->flags = 0;
8122         chk->asoc = &stcb->asoc;
8123         chk->whoTo = chk->asoc->primary_destination;
8124         atomic_add_int(&chk->whoTo->ref_count, 1);
8125         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8126         chk->asoc->ctrl_queue_cnt++;
8127         return;
8128 }
8129
8130 void
8131 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8132 {
8133         /*
8134          * formulate and queue a asconf-ack back to sender. the asconf-ack
8135          * must be stored in the tcb.
8136          */
8137         struct sctp_tmit_chunk *chk;
8138         struct sctp_asconf_ack *ack, *latest_ack;
8139         struct mbuf *m_ack, *m;
8140         struct sctp_nets *net = NULL;
8141
8142         SCTP_TCB_LOCK_ASSERT(stcb);
8143         /* Get the latest ASCONF-ACK */
8144         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8145         if (latest_ack == NULL) {
8146                 return;
8147         }
8148         if (latest_ack->last_sent_to != NULL &&
8149             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8150                 /* we're doing a retransmission */
8151                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8152                 if (net == NULL) {
8153                         /* no alternate */
8154                         if (stcb->asoc.last_control_chunk_from == NULL)
8155                                 net = stcb->asoc.primary_destination;
8156                         else
8157                                 net = stcb->asoc.last_control_chunk_from;
8158                 }
8159         } else {
8160                 /* normal case */
8161                 if (stcb->asoc.last_control_chunk_from == NULL)
8162                         net = stcb->asoc.primary_destination;
8163                 else
8164                         net = stcb->asoc.last_control_chunk_from;
8165         }
8166         latest_ack->last_sent_to = net;
8167
8168         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8169                 if (ack->data == NULL) {
8170                         continue;
8171                 }
8172                 /* copy the asconf_ack */
8173                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8174                 if (m_ack == NULL) {
8175                         /* couldn't copy it */
8176                         return;
8177                 }
8178                 sctp_alloc_a_chunk(stcb, chk);
8179                 if (chk == NULL) {
8180                         /* no memory */
8181                         if (m_ack)
8182                                 sctp_m_freem(m_ack);
8183                         return;
8184                 }
8185                 chk->copy_by_ref = 0;
8186
8187                 chk->whoTo = net;
8188                 chk->data = m_ack;
8189                 chk->send_size = 0;
8190                 /* Get size */
8191                 m = m_ack;
8192                 chk->send_size = ack->len;
8193                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8194                 chk->rec.chunk_id.can_take_data = 1;
8195                 chk->sent = SCTP_DATAGRAM_UNSENT;
8196                 chk->snd_count = 0;
8197                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8198                 chk->asoc = &stcb->asoc;
8199                 atomic_add_int(&chk->whoTo->ref_count, 1);
8200
8201                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8202                 chk->asoc->ctrl_queue_cnt++;
8203         }
8204         return;
8205 }
8206
8207
8208 static int
8209 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8210     struct sctp_tcb *stcb,
8211     struct sctp_association *asoc,
8212     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8213 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8214     SCTP_UNUSED
8215 #endif
8216 )
8217 {
8218         /*-
8219          * send out one MTU of retransmission. If fast_retransmit is
8220          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8221          * rwnd. For a Cookie or Asconf in the control chunk queue we
8222          * retransmit them by themselves.
8223          *
8224          * For data chunks we will pick out the lowest TSN's in the sent_queue
8225          * marked for resend and bundle them all together (up to a MTU of
8226          * destination). The address to send to should have been
8227          * selected/changed where the retransmission was marked (i.e. in FR
8228          * or t3-timeout routines).
8229          */
8230         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8231         struct sctp_tmit_chunk *chk, *fwd;
8232         struct mbuf *m, *endofchain;
8233         struct sctphdr *shdr;
8234         int asconf;
8235         struct sctp_nets *net = NULL;
8236         uint32_t tsns_sent = 0;
8237         int no_fragmentflg, bundle_at, cnt_thru;
8238         unsigned int mtu;
8239         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8240         struct sctp_auth_chunk *auth = NULL;
8241         uint32_t auth_offset = 0;
8242         uint32_t dmtu = 0;
8243
8244         SCTP_TCB_LOCK_ASSERT(stcb);
8245         tmr_started = ctl_cnt = bundle_at = error = 0;
8246         no_fragmentflg = 1;
8247         asconf = 0;
8248         fwd_tsn = 0;
8249         *cnt_out = 0;
8250         fwd = NULL;
8251         endofchain = m = NULL;
8252 #ifdef SCTP_AUDITING_ENABLED
8253         sctp_audit_log(0xC3, 1);
8254 #endif
8255         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8256             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8257                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8258                     asoc->sent_queue_retran_cnt);
8259                 asoc->sent_queue_cnt = 0;
8260                 asoc->sent_queue_cnt_removeable = 0;
8261                 /* send back 0/0 so we enter normal transmission */
8262                 *cnt_out = 0;
8263                 return (0);
8264         }
8265         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8266                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8267                     (chk->rec.chunk_id.id == SCTP_ASCONF) ||
8268                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8269                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8270                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8271                                 if (chk != asoc->str_reset) {
8272                                         /*
8273                                          * not eligible for retran if its
8274                                          * not ours
8275                                          */
8276                                         continue;
8277                                 }
8278                         }
8279                         ctl_cnt++;
8280                         if (chk->rec.chunk_id.id == SCTP_ASCONF) {
8281                                 no_fragmentflg = 1;
8282                                 asconf = 1;
8283                         }
8284                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8285                                 fwd_tsn = 1;
8286                                 fwd = chk;
8287                         }
8288                         /*
8289                          * Add an AUTH chunk, if chunk requires it save the
8290                          * offset into the chain for AUTH
8291                          */
8292                         if ((auth == NULL) &&
8293                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8294                             stcb->asoc.peer_auth_chunks))) {
8295                                 m = sctp_add_auth_chunk(m, &endofchain,
8296                                     &auth, &auth_offset,
8297                                     stcb,
8298                                     chk->rec.chunk_id.id);
8299                         }
8300                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8301                         break;
8302                 }
8303         }
8304         one_chunk = 0;
8305         cnt_thru = 0;
8306         /* do we have control chunks to retransmit? */
8307         if (m != NULL) {
8308                 /* Start a timer no matter if we suceed or fail */
8309                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8310                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8311                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8312                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8313
8314                 SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
8315                 if (m == NULL) {
8316                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8317                         return (ENOBUFS);
8318                 }
8319                 shdr = mtod(m, struct sctphdr *);
8320                 shdr->src_port = inp->sctp_lport;
8321                 shdr->dest_port = stcb->rport;
8322                 shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8323                 shdr->checksum = 0;
8324                 auth_offset += sizeof(struct sctphdr);
8325                 chk->snd_count++;       /* update our count */
8326
8327                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8328                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m, auth_offset,
8329                     auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
8330                         SCTP_STAT_INCR(sctps_lowlevelerr);
8331                         return (error);
8332                 }
8333                 m = endofchain = NULL;
8334                 auth = NULL;
8335                 auth_offset = 0;
8336                 /*
8337                  * We don't want to mark the net->sent time here since this
8338                  * we use this for HB and retrans cannot measure RTT
8339                  */
8340                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8341                 *cnt_out += 1;
8342                 chk->sent = SCTP_DATAGRAM_SENT;
8343                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8344                 if (fwd_tsn == 0) {
8345                         return (0);
8346                 } else {
8347                         /* Clean up the fwd-tsn list */
8348                         sctp_clean_up_ctl(stcb, asoc);
8349                         return (0);
8350                 }
8351         }
8352         /*
8353          * Ok, it is just data retransmission we need to do or that and a
8354          * fwd-tsn with it all.
8355          */
8356         if (TAILQ_EMPTY(&asoc->sent_queue)) {
8357                 return (SCTP_RETRAN_DONE);
8358         }
8359         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
8360             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
8361                 /* not yet open, resend the cookie and that is it */
8362                 return (1);
8363         }
8364 #ifdef SCTP_AUDITING_ENABLED
8365         sctp_auditing(20, inp, stcb, NULL);
8366 #endif
8367         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
8368                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
8369                         /* No, not sent to this net or not ready for rtx */
8370                         continue;
8371                 }
8372                 if ((sctp_max_retran_chunk) && (chk->snd_count >= sctp_max_retran_chunk)) {
8373                         /* Gak, we have exceeded max unlucky retran, abort! */
8374                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
8375                             chk->snd_count,
8376                             sctp_max_retran_chunk);
8377                         atomic_add_int(&stcb->asoc.refcnt, 1);
8378                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
8379                         SCTP_TCB_LOCK(stcb);
8380                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
8381                         return (SCTP_RETRAN_EXIT);
8382                 }
8383                 /* pick up the net */
8384                 net = chk->whoTo;
8385                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8386                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8387                 } else {
8388                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8389                 }
8390
8391                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
8392                         /* No room in peers rwnd */
8393                         uint32_t tsn;
8394
8395                         tsn = asoc->last_acked_seq + 1;
8396                         if (tsn == chk->rec.data.TSN_seq) {
8397                                 /*
8398                                  * we make a special exception for this
8399                                  * case. The peer has no rwnd but is missing
8400                                  * the lowest chunk.. which is probably what
8401                                  * is holding up the rwnd.
8402                                  */
8403                                 goto one_chunk_around;
8404                         }
8405                         return (1);
8406                 }
8407 one_chunk_around:
8408                 if (asoc->peers_rwnd < mtu) {
8409                         one_chunk = 1;
8410                         if ((asoc->peers_rwnd == 0) &&
8411                             (asoc->total_flight == 0)) {
8412                                 chk->window_probe = 1;
8413                                 chk->whoTo->window_probe = 1;
8414                         }
8415                 }
8416 #ifdef SCTP_AUDITING_ENABLED
8417                 sctp_audit_log(0xC3, 2);
8418 #endif
8419                 bundle_at = 0;
8420                 m = NULL;
8421                 net->fast_retran_ip = 0;
8422                 if (chk->rec.data.doing_fast_retransmit == 0) {
8423                         /*
8424                          * if no FR in progress skip destination that have
8425                          * flight_size > cwnd.
8426                          */
8427                         if (net->flight_size >= net->cwnd) {
8428                                 continue;
8429                         }
8430                 } else {
8431                         /*
8432                          * Mark the destination net to have FR recovery
8433                          * limits put on it.
8434                          */
8435                         *fr_done = 1;
8436                         net->fast_retran_ip = 1;
8437                 }
8438
8439                 /*
8440                  * if no AUTH is yet included and this chunk requires it,
8441                  * make sure to account for it.  We don't apply the size
8442                  * until the AUTH chunk is actually added below in case
8443                  * there is no room for this chunk.
8444                  */
8445                 if ((auth == NULL) &&
8446                     sctp_auth_is_required_chunk(SCTP_DATA,
8447                     stcb->asoc.peer_auth_chunks)) {
8448                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8449                 } else
8450                         dmtu = 0;
8451
8452                 if ((chk->send_size <= (mtu - dmtu)) ||
8453                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8454                         /* ok we will add this one */
8455                         if ((auth == NULL) &&
8456                             (sctp_auth_is_required_chunk(SCTP_DATA,
8457                             stcb->asoc.peer_auth_chunks))) {
8458                                 m = sctp_add_auth_chunk(m, &endofchain,
8459                                     &auth, &auth_offset,
8460                                     stcb, SCTP_DATA);
8461                         }
8462                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8463                         if (m == NULL) {
8464                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8465                                 return (ENOMEM);
8466                         }
8467                         /* Do clear IP_DF ? */
8468                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8469                                 no_fragmentflg = 0;
8470                         }
8471                         /* upate our MTU size */
8472                         if (mtu > (chk->send_size + dmtu))
8473                                 mtu -= (chk->send_size + dmtu);
8474                         else
8475                                 mtu = 0;
8476                         data_list[bundle_at++] = chk;
8477                         if (one_chunk && (asoc->total_flight <= 0)) {
8478                                 SCTP_STAT_INCR(sctps_windowprobed);
8479                         }
8480                 }
8481                 if (one_chunk == 0) {
8482                         /*
8483                          * now are there anymore forward from chk to pick
8484                          * up?
8485                          */
8486                         fwd = TAILQ_NEXT(chk, sctp_next);
8487                         while (fwd) {
8488                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
8489                                         /* Nope, not for retran */
8490                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8491                                         continue;
8492                                 }
8493                                 if (fwd->whoTo != net) {
8494                                         /* Nope, not the net in question */
8495                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8496                                         continue;
8497                                 }
8498                                 if ((auth == NULL) &&
8499                                     sctp_auth_is_required_chunk(SCTP_DATA,
8500                                     stcb->asoc.peer_auth_chunks)) {
8501                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8502                                 } else
8503                                         dmtu = 0;
8504                                 if (fwd->send_size <= (mtu - dmtu)) {
8505                                         if ((auth == NULL) &&
8506                                             (sctp_auth_is_required_chunk(SCTP_DATA,
8507                                             stcb->asoc.peer_auth_chunks))) {
8508                                                 m = sctp_add_auth_chunk(m,
8509                                                     &endofchain,
8510                                                     &auth, &auth_offset,
8511                                                     stcb,
8512                                                     SCTP_DATA);
8513                                         }
8514                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
8515                                         if (m == NULL) {
8516                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8517                                                 return (ENOMEM);
8518                                         }
8519                                         /* Do clear IP_DF ? */
8520                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8521                                                 no_fragmentflg = 0;
8522                                         }
8523                                         /* upate our MTU size */
8524                                         if (mtu > (fwd->send_size + dmtu))
8525                                                 mtu -= (fwd->send_size + dmtu);
8526                                         else
8527                                                 mtu = 0;
8528                                         data_list[bundle_at++] = fwd;
8529                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8530                                                 break;
8531                                         }
8532                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8533                                 } else {
8534                                         /* can't fit so we are done */
8535                                         break;
8536                                 }
8537                         }
8538                 }
8539                 /* Is there something to send for this destination? */
8540                 if (m) {
8541                         /*
8542                          * No matter if we fail/or suceed we should start a
8543                          * timer. A failure is like a lost IP packet :-)
8544                          */
8545                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8546                                 /*
8547                                  * no timer running on this destination
8548                                  * restart it.
8549                                  */
8550                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8551                                 tmr_started = 1;
8552                         }
8553                         SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
8554                         if (m == NULL) {
8555                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8556                                 return (ENOBUFS);
8557                         }
8558                         shdr = mtod(m, struct sctphdr *);
8559                         shdr->src_port = inp->sctp_lport;
8560                         shdr->dest_port = stcb->rport;
8561                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8562                         shdr->checksum = 0;
8563                         auth_offset += sizeof(struct sctphdr);
8564                         /* Now lets send it, if there is anything to send :> */
8565                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8566                             (struct sockaddr *)&net->ro._l_addr, m, auth_offset,
8567                             auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
8568                                 /* error, we could not output */
8569                                 SCTP_STAT_INCR(sctps_lowlevelerr);
8570                                 return (error);
8571                         }
8572                         m = endofchain = NULL;
8573                         auth = NULL;
8574                         auth_offset = 0;
8575                         /* For HB's */
8576                         /*
8577                          * We don't want to mark the net->sent time here
8578                          * since this we use this for HB and retrans cannot
8579                          * measure RTT
8580                          */
8581                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
8582
8583                         /* For auto-close */
8584                         cnt_thru++;
8585                         if (*now_filled == 0) {
8586                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8587                                 *now = asoc->time_last_sent;
8588                                 *now_filled = 1;
8589                         } else {
8590                                 asoc->time_last_sent = *now;
8591                         }
8592                         *cnt_out += bundle_at;
8593 #ifdef SCTP_AUDITING_ENABLED
8594                         sctp_audit_log(0xC4, bundle_at);
8595 #endif
8596                         if (bundle_at) {
8597                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8598                         }
8599                         for (i = 0; i < bundle_at; i++) {
8600                                 SCTP_STAT_INCR(sctps_sendretransdata);
8601                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
8602                                 /*
8603                                  * When we have a revoked data, and we
8604                                  * retransmit it, then we clear the revoked
8605                                  * flag since this flag dictates if we
8606                                  * subtracted from the fs
8607                                  */
8608                                 if (data_list[i]->rec.data.chunk_was_revoked) {
8609                                         /* Deflate the cwnd */
8610                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
8611                                         data_list[i]->rec.data.chunk_was_revoked = 0;
8612                                 }
8613                                 data_list[i]->snd_count++;
8614                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8615                                 /* record the time */
8616                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
8617                                 if (data_list[i]->book_size_scale) {
8618                                         /*
8619                                          * need to double the book size on
8620                                          * this one
8621                                          */
8622                                         data_list[i]->book_size_scale = 0;
8623                                         /*
8624                                          * Since we double the booksize, we
8625                                          * must also double the output queue
8626                                          * size, since this get shrunk when
8627                                          * we free by this amount.
8628                                          */
8629                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
8630                                         data_list[i]->book_size *= 2;
8631
8632
8633                                 } else {
8634                                         if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
8635                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
8636                                                     asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
8637                                         }
8638                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
8639                                             (uint32_t) (data_list[i]->send_size +
8640                                             sctp_peer_chunk_oh));
8641                                 }
8642                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
8643                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
8644                                             data_list[i]->whoTo->flight_size,
8645                                             data_list[i]->book_size,
8646                                             (uintptr_t) data_list[i]->whoTo,
8647                                             data_list[i]->rec.data.TSN_seq);
8648                                 }
8649                                 sctp_flight_size_increase(data_list[i]);
8650                                 sctp_total_flight_increase(stcb, data_list[i]);
8651                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
8652                                         /* SWS sender side engages */
8653                                         asoc->peers_rwnd = 0;
8654                                 }
8655                                 if ((i == 0) &&
8656                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
8657                                         SCTP_STAT_INCR(sctps_sendfastretrans);
8658                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
8659                                             (tmr_started == 0)) {
8660                                                 /*-
8661                                                  * ok we just fast-retrans'd
8662                                                  * the lowest TSN, i.e the
8663                                                  * first on the list. In
8664                                                  * this case we want to give
8665                                                  * some more time to get a
8666                                                  * SACK back without a
8667                                                  * t3-expiring.
8668                                                  */
8669                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
8670                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
8671                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8672                                         }
8673                                 }
8674                         }
8675                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8676                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
8677                         }
8678 #ifdef SCTP_AUDITING_ENABLED
8679                         sctp_auditing(21, inp, stcb, NULL);
8680 #endif
8681                 } else {
8682                         /* None will fit */
8683                         return (1);
8684                 }
8685                 if (asoc->sent_queue_retran_cnt <= 0) {
8686                         /* all done we have no more to retran */
8687                         asoc->sent_queue_retran_cnt = 0;
8688                         break;
8689                 }
8690                 if (one_chunk) {
8691                         /* No more room in rwnd */
8692                         return (1);
8693                 }
8694                 /* stop the for loop here. we sent out a packet */
8695                 break;
8696         }
8697         return (0);
8698 }
8699
8700
8701 static int
8702 sctp_timer_validation(struct sctp_inpcb *inp,
8703     struct sctp_tcb *stcb,
8704     struct sctp_association *asoc,
8705     int ret)
8706 {
8707         struct sctp_nets *net;
8708
8709         /* Validate that a timer is running somewhere */
8710         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
8711                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8712                         /* Here is a timer */
8713                         return (ret);
8714                 }
8715         }
8716         SCTP_TCB_LOCK_ASSERT(stcb);
8717         /* Gak, we did not have a timer somewhere */
8718         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
8719         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
8720         return (ret);
8721 }
8722
8723 void
8724 sctp_chunk_output(struct sctp_inpcb *inp,
8725     struct sctp_tcb *stcb,
8726     int from_where,
8727     int so_locked
8728 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8729     SCTP_UNUSED
8730 #endif
8731 )
8732 {
8733         /*-
8734          * Ok this is the generic chunk service queue. we must do the
8735          * following:
8736          * - See if there are retransmits pending, if so we must
8737          *   do these first.
8738          * - Service the stream queue that is next, moving any
8739          *   message (note I must get a complete message i.e.
8740          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
8741          *   TSN's
8742          * - Check to see if the cwnd/rwnd allows any output, if so we
8743          *   go ahead and fomulate and send the low level chunks. Making sure
8744          *   to combine any control in the control chunk queue also.
8745          */
8746         struct sctp_association *asoc;
8747         struct sctp_nets *net;
8748         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
8749             burst_cnt = 0, burst_limit = 0;
8750         struct timeval now;
8751         int now_filled = 0;
8752         int cwnd_full = 0;
8753         int nagle_on = 0;
8754         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
8755         int un_sent = 0;
8756         int fr_done, tot_frs = 0;
8757
8758         asoc = &stcb->asoc;
8759         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
8760                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
8761                         nagle_on = 0;
8762                 } else {
8763                         nagle_on = 1;
8764                 }
8765         }
8766         SCTP_TCB_LOCK_ASSERT(stcb);
8767
8768         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
8769
8770         if ((un_sent <= 0) &&
8771             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
8772             (asoc->sent_queue_retran_cnt == 0)) {
8773                 /* Nothing to do unless there is something to be sent left */
8774                 return;
8775         }
8776         /*
8777          * Do we have something to send, data or control AND a sack timer
8778          * running, if so piggy-back the sack.
8779          */
8780         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8781                 sctp_send_sack(stcb);
8782                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
8783         }
8784         while (asoc->sent_queue_retran_cnt) {
8785                 /*-
8786                  * Ok, it is retransmission time only, we send out only ONE
8787                  * packet with a single call off to the retran code.
8788                  */
8789                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
8790                         /*-
8791                          * Special hook for handling cookiess discarded
8792                          * by peer that carried data. Send cookie-ack only
8793                          * and then the next call with get the retran's.
8794                          */
8795                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
8796                             &cwnd_full, from_where,
8797                             &now, &now_filled, frag_point, so_locked);
8798                         return;
8799                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
8800                         /* if its not from a HB then do it */
8801                         fr_done = 0;
8802                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
8803                         if (fr_done) {
8804                                 tot_frs++;
8805                         }
8806                 } else {
8807                         /*
8808                          * its from any other place, we don't allow retran
8809                          * output (only control)
8810                          */
8811                         ret = 1;
8812                 }
8813                 if (ret > 0) {
8814                         /* Can't send anymore */
8815                         /*-
8816                          * now lets push out control by calling med-level
8817                          * output once. this assures that we WILL send HB's
8818                          * if queued too.
8819                          */
8820                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
8821                             &cwnd_full, from_where,
8822                             &now, &now_filled, frag_point, so_locked);
8823 #ifdef SCTP_AUDITING_ENABLED
8824                         sctp_auditing(8, inp, stcb, NULL);
8825 #endif
8826                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
8827                         return;
8828                 }
8829                 if (ret < 0) {
8830                         /*-
8831                          * The count was off.. retran is not happening so do
8832                          * the normal retransmission.
8833                          */
8834 #ifdef SCTP_AUDITING_ENABLED
8835                         sctp_auditing(9, inp, stcb, NULL);
8836 #endif
8837                         if (ret == SCTP_RETRAN_EXIT) {
8838                                 return;
8839                         }
8840                         break;
8841                 }
8842                 if (from_where == SCTP_OUTPUT_FROM_T3) {
8843                         /* Only one transmission allowed out of a timeout */
8844 #ifdef SCTP_AUDITING_ENABLED
8845                         sctp_auditing(10, inp, stcb, NULL);
8846 #endif
8847                         /* Push out any control */
8848                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
8849                             &now, &now_filled, frag_point, so_locked);
8850                         return;
8851                 }
8852                 if (tot_frs > asoc->max_burst) {
8853                         /* Hit FR burst limit */
8854                         return;
8855                 }
8856                 if ((num_out == 0) && (ret == 0)) {
8857
8858                         /* No more retrans to send */
8859                         break;
8860                 }
8861         }
8862 #ifdef SCTP_AUDITING_ENABLED
8863         sctp_auditing(12, inp, stcb, NULL);
8864 #endif
8865         /* Check for bad destinations, if they exist move chunks around. */
8866         burst_limit = asoc->max_burst;
8867         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
8868                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
8869                     SCTP_ADDR_NOT_REACHABLE) {
8870                         /*-
8871                          * if possible move things off of this address we
8872                          * still may send below due to the dormant state but
8873                          * we try to find an alternate address to send to
8874                          * and if we have one we move all queued data on the
8875                          * out wheel to this alternate address.
8876                          */
8877                         if (net->ref_count > 1)
8878                                 sctp_move_to_an_alt(stcb, asoc, net);
8879                 } else if (sctp_cmt_on_off && sctp_cmt_pf && ((net->dest_state & SCTP_ADDR_PF) ==
8880                     SCTP_ADDR_PF)) {
8881                         /*
8882                          * JRS 5/14/07 - If CMT PF is on and the current
8883                          * destination is in PF state, move all queued data
8884                          * to an alternate desination.
8885                          */
8886                         if (net->ref_count > 1)
8887                                 sctp_move_to_an_alt(stcb, asoc, net);
8888                 } else {
8889                         /*-
8890                          * if ((asoc->sat_network) || (net->addr_is_local))
8891                          * { burst_limit = asoc->max_burst *
8892                          * SCTP_SAT_NETWORK_BURST_INCR; }
8893                          */
8894                         if (sctp_use_cwnd_based_maxburst) {
8895                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
8896                                         /*
8897                                          * JRS - Use the congestion control
8898                                          * given in the congestion control
8899                                          * module
8900                                          */
8901                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
8902                                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
8903                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
8904                                         }
8905                                         SCTP_STAT_INCR(sctps_maxburstqueued);
8906                                 }
8907                                 net->fast_retran_ip = 0;
8908                         } else {
8909                                 if (net->flight_size == 0) {
8910                                         /* Should be decaying the cwnd here */
8911                                         ;
8912                                 }
8913                         }
8914                 }
8915
8916         }
8917         burst_cnt = 0;
8918         cwnd_full = 0;
8919         do {
8920                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
8921                     &reason_code, 0, &cwnd_full, from_where,
8922                     &now, &now_filled, frag_point, so_locked);
8923                 if (error) {
8924                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
8925                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
8926                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
8927                         }
8928                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8929                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
8930                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
8931                         }
8932                         break;
8933                 }
8934                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
8935
8936                 tot_out += num_out;
8937                 burst_cnt++;
8938                 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8939                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
8940                         if (num_out == 0) {
8941                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
8942                         }
8943                 }
8944                 if (nagle_on) {
8945                         /*-
8946                          * When nagle is on, we look at how much is un_sent, then
8947                          * if its smaller than an MTU and we have data in
8948                          * flight we stop.
8949                          */
8950                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
8951                             ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count)
8952                             * sizeof(struct sctp_data_chunk)));
8953                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
8954                             (stcb->asoc.total_flight > 0)) {
8955                                 break;
8956                         }
8957                 }
8958                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8959                     TAILQ_EMPTY(&asoc->send_queue) &&
8960                     TAILQ_EMPTY(&asoc->out_wheel)) {
8961                         /* Nothing left to send */
8962                         break;
8963                 }
8964                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
8965                         /* Nothing left to send */
8966                         break;
8967                 }
8968         } while (num_out && (sctp_use_cwnd_based_maxburst ||
8969             (burst_cnt < burst_limit)));
8970
8971         if (sctp_use_cwnd_based_maxburst == 0) {
8972                 if (burst_cnt >= burst_limit) {
8973                         SCTP_STAT_INCR(sctps_maxburstqueued);
8974                         asoc->burst_limit_applied = 1;
8975                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
8976                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
8977                         }
8978                 } else {
8979                         asoc->burst_limit_applied = 0;
8980                 }
8981         }
8982         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8983                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
8984         }
8985         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
8986             tot_out);
8987
8988         /*-
8989          * Now we need to clean up the control chunk chain if a ECNE is on
8990          * it. It must be marked as UNSENT again so next call will continue
8991          * to send it until such time that we get a CWR, to remove it.
8992          */
8993         if (stcb->asoc.ecn_echo_cnt_onq)
8994                 sctp_fix_ecn_echo(asoc);
8995         return;
8996 }
8997
8998
8999 int
9000 sctp_output(inp, m, addr, control, p, flags)
9001         struct sctp_inpcb *inp;
9002         struct mbuf *m;
9003         struct sockaddr *addr;
9004         struct mbuf *control;
9005         struct thread *p;
9006         int flags;
9007 {
9008         if (inp == NULL) {
9009                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9010                 return (EINVAL);
9011         }
9012         if (inp->sctp_socket == NULL) {
9013                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9014                 return (EINVAL);
9015         }
9016         return (sctp_sosend(inp->sctp_socket,
9017             addr,
9018             (struct uio *)NULL,
9019             m,
9020             control,
9021             flags, p
9022             ));
9023 }
9024
9025 void
9026 send_forward_tsn(struct sctp_tcb *stcb,
9027     struct sctp_association *asoc)
9028 {
9029         struct sctp_tmit_chunk *chk;
9030         struct sctp_forward_tsn_chunk *fwdtsn;
9031
9032         SCTP_TCB_LOCK_ASSERT(stcb);
9033         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9034                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9035                         /* mark it to unsent */
9036                         chk->sent = SCTP_DATAGRAM_UNSENT;
9037                         chk->snd_count = 0;
9038                         /* Do we correct its output location? */
9039                         if (chk->whoTo != asoc->primary_destination) {
9040                                 sctp_free_remote_addr(chk->whoTo);
9041                                 chk->whoTo = asoc->primary_destination;
9042                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9043                         }
9044                         goto sctp_fill_in_rest;
9045                 }
9046         }
9047         /* Ok if we reach here we must build one */
9048         sctp_alloc_a_chunk(stcb, chk);
9049         if (chk == NULL) {
9050                 return;
9051         }
9052         chk->copy_by_ref = 0;
9053         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9054         chk->rec.chunk_id.can_take_data = 0;
9055         chk->asoc = asoc;
9056         chk->whoTo = NULL;
9057
9058         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9059         if (chk->data == NULL) {
9060                 sctp_free_a_chunk(stcb, chk);
9061                 return;
9062         }
9063         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9064         chk->sent = SCTP_DATAGRAM_UNSENT;
9065         chk->snd_count = 0;
9066         chk->whoTo = asoc->primary_destination;
9067         atomic_add_int(&chk->whoTo->ref_count, 1);
9068         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9069         asoc->ctrl_queue_cnt++;
9070 sctp_fill_in_rest:
9071         /*-
9072          * Here we go through and fill out the part that deals with
9073          * stream/seq of the ones we skip.
9074          */
9075         SCTP_BUF_LEN(chk->data) = 0;
9076         {
9077                 struct sctp_tmit_chunk *at, *tp1, *last;
9078                 struct sctp_strseq *strseq;
9079                 unsigned int cnt_of_space, i, ovh;
9080                 unsigned int space_needed;
9081                 unsigned int cnt_of_skipped = 0;
9082
9083                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9084                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9085                                 /* no more to look at */
9086                                 break;
9087                         }
9088                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9089                                 /* We don't report these */
9090                                 continue;
9091                         }
9092                         cnt_of_skipped++;
9093                 }
9094                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9095                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9096
9097                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9098
9099                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9100                         ovh = SCTP_MIN_OVERHEAD;
9101                 } else {
9102                         ovh = SCTP_MIN_V4_OVERHEAD;
9103                 }
9104                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9105                         /* trim to a mtu size */
9106                         cnt_of_space = asoc->smallest_mtu - ovh;
9107                 }
9108                 if (cnt_of_space < space_needed) {
9109                         /*-
9110                          * ok we must trim down the chunk by lowering the
9111                          * advance peer ack point.
9112                          */
9113                         cnt_of_skipped = (cnt_of_space -
9114                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9115                             sizeof(struct sctp_strseq)));
9116                         /*-
9117                          * Go through and find the TSN that will be the one
9118                          * we report.
9119                          */
9120                         at = TAILQ_FIRST(&asoc->sent_queue);
9121                         for (i = 0; i < cnt_of_skipped; i++) {
9122                                 tp1 = TAILQ_NEXT(at, sctp_next);
9123                                 at = tp1;
9124                         }
9125                         last = at;
9126                         /*-
9127                          * last now points to last one I can report, update
9128                          * peer ack point
9129                          */
9130                         asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
9131                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9132                 }
9133                 chk->send_size = space_needed;
9134                 /* Setup the chunk */
9135                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9136                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9137                 fwdtsn->ch.chunk_flags = 0;
9138                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9139                 fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
9140                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9141                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9142                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9143                 fwdtsn++;
9144                 /*-
9145                  * Move pointer to after the fwdtsn and transfer to the
9146                  * strseq pointer.
9147                  */
9148                 strseq = (struct sctp_strseq *)fwdtsn;
9149                 /*-
9150                  * Now populate the strseq list. This is done blindly
9151                  * without pulling out duplicate stream info. This is
9152                  * inefficent but won't harm the process since the peer will
9153                  * look at these in sequence and will thus release anything.
9154                  * It could mean we exceed the PMTU and chop off some that
9155                  * we could have included.. but this is unlikely (aka 1432/4
9156                  * would mean 300+ stream seq's would have to be reported in
9157                  * one FWD-TSN. With a bit of work we can later FIX this to
9158                  * optimize and pull out duplcates.. but it does add more
9159                  * overhead. So for now... not!
9160                  */
9161                 at = TAILQ_FIRST(&asoc->sent_queue);
9162                 for (i = 0; i < cnt_of_skipped; i++) {
9163                         tp1 = TAILQ_NEXT(at, sctp_next);
9164                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9165                                 /* We don't report these */
9166                                 i--;
9167                                 at = tp1;
9168                                 continue;
9169                         }
9170                         strseq->stream = ntohs(at->rec.data.stream_number);
9171                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9172                         strseq++;
9173                         at = tp1;
9174                 }
9175         }
9176         return;
9177
9178 }
9179
9180 void
9181 sctp_send_sack(struct sctp_tcb *stcb)
9182 {
9183         /*-
9184          * Queue up a SACK in the control queue. We must first check to see
9185          * if a SACK is somehow on the control queue. If so, we will take
9186          * and and remove the old one.
9187          */
9188         struct sctp_association *asoc;
9189         struct sctp_tmit_chunk *chk, *a_chk;
9190         struct sctp_sack_chunk *sack;
9191         struct sctp_gap_ack_block *gap_descriptor;
9192         struct sack_track *selector;
9193         int mergeable = 0;
9194         int offset;
9195         caddr_t limit;
9196         uint32_t *dup;
9197         int limit_reached = 0;
9198         unsigned int i, jstart, siz, j;
9199         unsigned int num_gap_blocks = 0, space;
9200         int num_dups = 0;
9201         int space_req;
9202
9203         a_chk = NULL;
9204         asoc = &stcb->asoc;
9205         SCTP_TCB_LOCK_ASSERT(stcb);
9206         if (asoc->last_data_chunk_from == NULL) {
9207                 /* Hmm we never received anything */
9208                 return;
9209         }
9210         sctp_set_rwnd(stcb, asoc);
9211         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9212                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9213                         /* Hmm, found a sack already on queue, remove it */
9214                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9215                         asoc->ctrl_queue_cnt++;
9216                         a_chk = chk;
9217                         if (a_chk->data) {
9218                                 sctp_m_freem(a_chk->data);
9219                                 a_chk->data = NULL;
9220                         }
9221                         sctp_free_remote_addr(a_chk->whoTo);
9222                         a_chk->whoTo = NULL;
9223                         break;
9224                 }
9225         }
9226         if (a_chk == NULL) {
9227                 sctp_alloc_a_chunk(stcb, a_chk);
9228                 if (a_chk == NULL) {
9229                         /* No memory so we drop the idea, and set a timer */
9230                         if (stcb->asoc.delayed_ack) {
9231                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9232                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9233                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9234                                     stcb->sctp_ep, stcb, NULL);
9235                         } else {
9236                                 stcb->asoc.send_sack = 1;
9237                         }
9238                         return;
9239                 }
9240                 a_chk->copy_by_ref = 0;
9241                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9242                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9243                 a_chk->rec.chunk_id.can_take_data = 1;
9244         }
9245         /* Clear our pkt counts */
9246         asoc->data_pkts_seen = 0;
9247
9248         a_chk->asoc = asoc;
9249         a_chk->snd_count = 0;
9250         a_chk->send_size = 0;   /* fill in later */
9251         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9252         a_chk->whoTo = NULL;
9253
9254         if ((asoc->numduptsns) ||
9255             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9256             ) {
9257                 /*-
9258                  * Ok, we have some duplicates or the destination for the
9259                  * sack is unreachable, lets see if we can select an
9260                  * alternate than asoc->last_data_chunk_from
9261                  */
9262                 if ((!(asoc->last_data_chunk_from->dest_state &
9263                     SCTP_ADDR_NOT_REACHABLE)) &&
9264                     (asoc->used_alt_onsack > asoc->numnets)) {
9265                         /* We used an alt last time, don't this time */
9266                         a_chk->whoTo = NULL;
9267                 } else {
9268                         asoc->used_alt_onsack++;
9269                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9270                 }
9271                 if (a_chk->whoTo == NULL) {
9272                         /* Nope, no alternate */
9273                         a_chk->whoTo = asoc->last_data_chunk_from;
9274                         asoc->used_alt_onsack = 0;
9275                 }
9276         } else {
9277                 /*
9278                  * No duplicates so we use the last place we received data
9279                  * from.
9280                  */
9281                 asoc->used_alt_onsack = 0;
9282                 a_chk->whoTo = asoc->last_data_chunk_from;
9283         }
9284         if (a_chk->whoTo) {
9285                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9286         }
9287         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
9288                 /* no gaps */
9289                 space_req = sizeof(struct sctp_sack_chunk);
9290         } else {
9291                 /* gaps get a cluster */
9292                 space_req = MCLBYTES;
9293         }
9294         /* Ok now lets formulate a MBUF with our sack */
9295         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9296         if ((a_chk->data == NULL) ||
9297             (a_chk->whoTo == NULL)) {
9298                 /* rats, no mbuf memory */
9299                 if (a_chk->data) {
9300                         /* was a problem with the destination */
9301                         sctp_m_freem(a_chk->data);
9302                         a_chk->data = NULL;
9303                 }
9304                 sctp_free_a_chunk(stcb, a_chk);
9305                 /* sa_ignore NO_NULL_CHK */
9306                 if (stcb->asoc.delayed_ack) {
9307                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9308                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
9309                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9310                             stcb->sctp_ep, stcb, NULL);
9311                 } else {
9312                         stcb->asoc.send_sack = 1;
9313                 }
9314                 return;
9315         }
9316         /* ok, lets go through and fill it in */
9317         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
9318         space = M_TRAILINGSPACE(a_chk->data);
9319         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
9320                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
9321         }
9322         limit = mtod(a_chk->data, caddr_t);
9323         limit += space;
9324
9325         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
9326         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
9327         /* 0x01 is used by nonce for ecn */
9328         if ((sctp_ecn_enable) &&
9329             (sctp_ecn_nonce) &&
9330             (asoc->peer_supports_ecn_nonce))
9331                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
9332         else
9333                 sack->ch.chunk_flags = 0;
9334
9335         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
9336                 /*-
9337                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
9338                  * received, then set high bit to 1, else 0. Reset
9339                  * pkts_rcvd.
9340                  */
9341                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
9342                 asoc->cmt_dac_pkts_rcvd = 0;
9343         }
9344 #ifdef SCTP_ASOCLOG_OF_TSNS
9345         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
9346         stcb->asoc.cumack_log_atsnt++;
9347         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
9348                 stcb->asoc.cumack_log_atsnt = 0;
9349         }
9350 #endif
9351         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
9352         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
9353         asoc->my_last_reported_rwnd = asoc->my_rwnd;
9354
9355         /* reset the readers interpretation */
9356         stcb->freed_by_sorcv_sincelast = 0;
9357
9358         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
9359
9360         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
9361         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
9362                 offset = 1;
9363                 /*-
9364                  * cum-ack behind the mapping array, so we start and use all
9365                  * entries.
9366                  */
9367                 jstart = 0;
9368         } else {
9369                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
9370                 /*-
9371                  * we skip the first one when the cum-ack is at or above the
9372                  * mapping array base. Note this only works if
9373                  */
9374                 jstart = 1;
9375         }
9376         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
9377                 /* we have a gap .. maybe */
9378                 for (i = 0; i < siz; i++) {
9379                         selector = &sack_array[asoc->mapping_array[i]];
9380                         if (mergeable && selector->right_edge) {
9381                                 /*
9382                                  * Backup, left and right edges were ok to
9383                                  * merge.
9384                                  */
9385                                 num_gap_blocks--;
9386                                 gap_descriptor--;
9387                         }
9388                         if (selector->num_entries == 0)
9389                                 mergeable = 0;
9390                         else {
9391                                 for (j = jstart; j < selector->num_entries; j++) {
9392                                         if (mergeable && selector->right_edge) {
9393                                                 /*
9394                                                  * do a merge by NOT setting
9395                                                  * the left side
9396                                                  */
9397                                                 mergeable = 0;
9398                                         } else {
9399                                                 /*
9400                                                  * no merge, set the left
9401                                                  * side
9402                                                  */
9403                                                 mergeable = 0;
9404                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
9405                                         }
9406                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
9407                                         num_gap_blocks++;
9408                                         gap_descriptor++;
9409                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
9410                                                 /* no more room */
9411                                                 limit_reached = 1;
9412                                                 break;
9413                                         }
9414                                 }
9415                                 if (selector->left_edge) {
9416                                         mergeable = 1;
9417                                 }
9418                         }
9419                         if (limit_reached) {
9420                                 /* Reached the limit stop */
9421                                 break;
9422                         }
9423                         jstart = 0;
9424                         offset += 8;
9425                 }
9426                 if (num_gap_blocks == 0) {
9427                         /*
9428                          * slide not yet happened, and somehow we got called
9429                          * to send a sack. Cumack needs to move up.
9430                          */
9431                         int abort_flag = 0;
9432
9433                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
9434                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
9435                         sctp_sack_check(stcb, 0, 0, &abort_flag);
9436                 }
9437         }
9438         /* now we must add any dups we are going to report. */
9439         if ((limit_reached == 0) && (asoc->numduptsns)) {
9440                 dup = (uint32_t *) gap_descriptor;
9441                 for (i = 0; i < asoc->numduptsns; i++) {
9442                         *dup = htonl(asoc->dup_tsns[i]);
9443                         dup++;
9444                         num_dups++;
9445                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
9446                                 /* no more room */
9447                                 break;
9448                         }
9449                 }
9450                 asoc->numduptsns = 0;
9451         }
9452         /*
9453          * now that the chunk is prepared queue it to the control chunk
9454          * queue.
9455          */
9456         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
9457             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
9458             (num_dups * sizeof(int32_t)));
9459         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
9460         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
9461         sack->sack.num_dup_tsns = htons(num_dups);
9462         sack->ch.chunk_length = htons(a_chk->send_size);
9463         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
9464         asoc->ctrl_queue_cnt++;
9465         asoc->send_sack = 0;
9466         SCTP_STAT_INCR(sctps_sendsacks);
9467         return;
9468 }
9469
9470
9471 void
9472 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
9473 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9474     SCTP_UNUSED
9475 #endif
9476 )
9477 {
9478         struct mbuf *m_abort;
9479         struct mbuf *m_out = NULL, *m_end = NULL;
9480         struct sctp_abort_chunk *abort = NULL;
9481         int sz;
9482         uint32_t auth_offset = 0;
9483         struct sctp_auth_chunk *auth = NULL;
9484         struct sctphdr *shdr;
9485
9486         /*-
9487          * Add an AUTH chunk, if chunk requires it and save the offset into
9488          * the chain for AUTH
9489          */
9490         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
9491             stcb->asoc.peer_auth_chunks)) {
9492                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
9493                     stcb, SCTP_ABORT_ASSOCIATION);
9494         }
9495         SCTP_TCB_LOCK_ASSERT(stcb);
9496         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9497         if (m_abort == NULL) {
9498                 /* no mbuf's */
9499                 if (m_out)
9500                         sctp_m_freem(m_out);
9501                 return;
9502         }
9503         /* link in any error */
9504         SCTP_BUF_NEXT(m_abort) = operr;
9505         sz = 0;
9506         if (operr) {
9507                 struct mbuf *n;
9508
9509                 n = operr;
9510                 while (n) {
9511                         sz += SCTP_BUF_LEN(n);
9512                         n = SCTP_BUF_NEXT(n);
9513                 }
9514         }
9515         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
9516         if (m_out == NULL) {
9517                 /* NO Auth chunk prepended, so reserve space in front */
9518                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
9519                 m_out = m_abort;
9520         } else {
9521                 /* Put AUTH chunk at the front of the chain */
9522                 SCTP_BUF_NEXT(m_end) = m_abort;
9523         }
9524
9525         /* fill in the ABORT chunk */
9526         abort = mtod(m_abort, struct sctp_abort_chunk *);
9527         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
9528         abort->ch.chunk_flags = 0;
9529         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
9530
9531         /* prepend and fill in the SCTP header */
9532         SCTP_BUF_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
9533         if (m_out == NULL) {
9534                 /* TSNH: no memory */
9535                 return;
9536         }
9537         shdr = mtod(m_out, struct sctphdr *);
9538         shdr->src_port = stcb->sctp_ep->sctp_lport;
9539         shdr->dest_port = stcb->rport;
9540         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
9541         shdr->checksum = 0;
9542         auth_offset += sizeof(struct sctphdr);
9543
9544         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
9545             stcb->asoc.primary_destination,
9546             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
9547             m_out, auth_offset, auth, 1, 0, NULL, 0, so_locked);
9548         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9549 }
9550
9551 void
9552 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
9553     struct sctp_nets *net)
9554 {
9555         /* formulate and SEND a SHUTDOWN-COMPLETE */
9556         struct mbuf *m_shutdown_comp;
9557         struct sctp_shutdown_complete_msg *comp_cp;
9558
9559         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 0, M_DONTWAIT, 1, MT_HEADER);
9560         if (m_shutdown_comp == NULL) {
9561                 /* no mbuf's */
9562                 return;
9563         }
9564         comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
9565         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
9566         comp_cp->shut_cmp.ch.chunk_flags = 0;
9567         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
9568         comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
9569         comp_cp->sh.dest_port = stcb->rport;
9570         comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
9571         comp_cp->sh.checksum = 0;
9572
9573         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
9574         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
9575             (struct sockaddr *)&net->ro._l_addr,
9576             m_shutdown_comp, 0, NULL, 1, 0, NULL, 0, SCTP_SO_NOT_LOCKED);
9577         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9578         return;
9579 }
9580
9581 void
9582 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
9583     uint32_t vrf_id)
9584 {
9585         /* formulate and SEND a SHUTDOWN-COMPLETE */
9586         struct mbuf *o_pak;
9587         struct mbuf *mout;
9588         struct ip *iph, *iph_out;
9589         struct ip6_hdr *ip6, *ip6_out;
9590         int offset_out, len, mlen;
9591         struct sctp_shutdown_complete_msg *comp_cp;
9592
9593         /* Get room for the largest message */
9594         len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
9595         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
9596         if (mout == NULL) {
9597                 return;
9598         }
9599         SCTP_BUF_LEN(mout) = len;
9600         iph = mtod(m, struct ip *);
9601         iph_out = NULL;
9602         ip6_out = NULL;
9603         offset_out = 0;
9604         if (iph->ip_v == IPVERSION) {
9605                 SCTP_BUF_LEN(mout) = sizeof(struct ip) +
9606                     sizeof(struct sctp_shutdown_complete_msg);
9607                 SCTP_BUF_NEXT(mout) = NULL;
9608                 iph_out = mtod(mout, struct ip *);
9609
9610                 /* Fill in the IP header for the ABORT */
9611                 iph_out->ip_v = IPVERSION;
9612                 iph_out->ip_hl = (sizeof(struct ip) / 4);
9613                 iph_out->ip_tos = (u_char)0;
9614                 iph_out->ip_id = 0;
9615                 iph_out->ip_off = 0;
9616                 iph_out->ip_ttl = MAXTTL;
9617                 iph_out->ip_p = IPPROTO_SCTP;
9618                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
9619                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
9620
9621                 /* let IP layer calculate this */
9622                 iph_out->ip_sum = 0;
9623                 offset_out += sizeof(*iph_out);
9624                 comp_cp = (struct sctp_shutdown_complete_msg *)(
9625                     (caddr_t)iph_out + offset_out);
9626         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
9627                 ip6 = (struct ip6_hdr *)iph;
9628                 SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr) +
9629                     sizeof(struct sctp_shutdown_complete_msg);
9630                 SCTP_BUF_NEXT(mout) = NULL;
9631                 ip6_out = mtod(mout, struct ip6_hdr *);
9632
9633                 /* Fill in the IPv6 header for the ABORT */
9634                 ip6_out->ip6_flow = ip6->ip6_flow;
9635                 ip6_out->ip6_hlim = ip6_defhlim;
9636                 ip6_out->ip6_nxt = IPPROTO_SCTP;
9637                 ip6_out->ip6_src = ip6->ip6_dst;
9638                 ip6_out->ip6_dst = ip6->ip6_src;
9639                 /*
9640                  * ?? The old code had both the iph len + payload, I think
9641                  * this is wrong and would never have worked
9642                  */
9643                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
9644                 offset_out += sizeof(*ip6_out);
9645                 comp_cp = (struct sctp_shutdown_complete_msg *)(
9646                     (caddr_t)ip6_out + offset_out);
9647         } else {
9648                 /* Currently not supported. */
9649                 return;
9650         }
9651         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
9652                 /* no mbuf's */
9653                 sctp_m_freem(mout);
9654                 return;
9655         }
9656         /* Now copy in and fill in the ABORT tags etc. */
9657         comp_cp->sh.src_port = sh->dest_port;
9658         comp_cp->sh.dest_port = sh->src_port;
9659         comp_cp->sh.checksum = 0;
9660         comp_cp->sh.v_tag = sh->v_tag;
9661         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
9662         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
9663         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
9664
9665         /* add checksum */
9666         comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
9667         if (iph_out != NULL) {
9668                 sctp_route_t ro;
9669                 int ret;
9670                 struct sctp_tcb *stcb = NULL;
9671
9672                 mlen = SCTP_BUF_LEN(mout);
9673                 bzero(&ro, sizeof ro);
9674                 /* set IPv4 length */
9675                 iph_out->ip_len = mlen;
9676 #ifdef  SCTP_PACKET_LOGGING
9677                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
9678                         sctp_packet_log(mout, mlen);
9679 #endif
9680                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
9681
9682                 /* out it goes */
9683                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
9684
9685                 /* Free the route if we got one back */
9686                 if (ro.ro_rt)
9687                         RTFREE(ro.ro_rt);
9688         } else if (ip6_out != NULL) {
9689                 struct route_in6 ro;
9690                 int ret;
9691                 struct sctp_tcb *stcb = NULL;
9692                 struct ifnet *ifp = NULL;
9693
9694                 bzero(&ro, sizeof(ro));
9695                 mlen = SCTP_BUF_LEN(mout);
9696 #ifdef  SCTP_PACKET_LOGGING
9697                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
9698                         sctp_packet_log(mout, mlen);
9699 #endif
9700                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
9701                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
9702
9703                 /* Free the route if we got one back */
9704                 if (ro.ro_rt)
9705                         RTFREE(ro.ro_rt);
9706         }
9707         SCTP_STAT_INCR(sctps_sendpackets);
9708         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
9709         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9710         return;
9711
9712 }
9713
9714 static struct sctp_nets *
9715 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
9716 {
9717         struct sctp_nets *net, *hnet;
9718         int ms_goneby, highest_ms, state_overide = 0;
9719
9720         (void)SCTP_GETTIME_TIMEVAL(now);
9721         highest_ms = 0;
9722         hnet = NULL;
9723         SCTP_TCB_LOCK_ASSERT(stcb);
9724         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
9725                 if (
9726                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
9727                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
9728                     ) {
9729                         /*
9730                          * Skip this guy from consideration if HB is off AND
9731                          * its confirmed
9732                          */
9733                         continue;
9734                 }
9735                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
9736                         /* skip this dest net from consideration */
9737                         continue;
9738                 }
9739                 if (net->last_sent_time.tv_sec) {
9740                         /* Sent to so we subtract */
9741                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
9742                 } else
9743                         /* Never been sent to */
9744                         ms_goneby = 0x7fffffff;
9745                 /*-
9746                  * When the address state is unconfirmed but still
9747                  * considered reachable, we HB at a higher rate. Once it
9748                  * goes confirmed OR reaches the "unreachable" state, thenw
9749                  * we cut it back to HB at a more normal pace.
9750                  */
9751                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
9752                         state_overide = 1;
9753                 } else {
9754                         state_overide = 0;
9755                 }
9756
9757                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
9758                     (ms_goneby > highest_ms)) {
9759                         highest_ms = ms_goneby;
9760                         hnet = net;
9761                 }
9762         }
9763         if (hnet &&
9764             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
9765                 state_overide = 1;
9766         } else {
9767                 state_overide = 0;
9768         }
9769
9770         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
9771                 /*-
9772                  * Found the one with longest delay bounds OR it is
9773                  * unconfirmed and still not marked unreachable.
9774                  */
9775                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
9776 #ifdef SCTP_DEBUG
9777                 if (hnet) {
9778                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
9779                             (struct sockaddr *)&hnet->ro._l_addr);
9780                 } else {
9781                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
9782                 }
9783 #endif
9784                 /* update the timer now */
9785                 hnet->last_sent_time = *now;
9786                 return (hnet);
9787         }
9788         /* Nothing to HB */
9789         return (NULL);
9790 }
9791
9792 int
9793 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
9794 {
9795         struct sctp_tmit_chunk *chk;
9796         struct sctp_nets *net;
9797         struct sctp_heartbeat_chunk *hb;
9798         struct timeval now;
9799         struct sockaddr_in *sin;
9800         struct sockaddr_in6 *sin6;
9801
9802         SCTP_TCB_LOCK_ASSERT(stcb);
9803         if (user_req == 0) {
9804                 net = sctp_select_hb_destination(stcb, &now);
9805                 if (net == NULL) {
9806                         /*-
9807                          * All our busy none to send to, just start the
9808                          * timer again.
9809                          */
9810                         if (stcb->asoc.state == 0) {
9811                                 return (0);
9812                         }
9813                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
9814                             stcb->sctp_ep,
9815                             stcb,
9816                             net);
9817                         return (0);
9818                 }
9819         } else {
9820                 net = u_net;
9821                 if (net == NULL) {
9822                         return (0);
9823                 }
9824                 (void)SCTP_GETTIME_TIMEVAL(&now);
9825         }
9826         sin = (struct sockaddr_in *)&net->ro._l_addr;
9827         if (sin->sin_family != AF_INET) {
9828                 if (sin->sin_family != AF_INET6) {
9829                         /* huh */
9830                         return (0);
9831                 }
9832         }
9833         sctp_alloc_a_chunk(stcb, chk);
9834         if (chk == NULL) {
9835                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
9836                 return (0);
9837         }
9838         chk->copy_by_ref = 0;
9839         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
9840         chk->rec.chunk_id.can_take_data = 1;
9841         chk->asoc = &stcb->asoc;
9842         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
9843
9844         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
9845         if (chk->data == NULL) {
9846                 sctp_free_a_chunk(stcb, chk);
9847                 return (0);
9848         }
9849         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9850         SCTP_BUF_LEN(chk->data) = chk->send_size;
9851         chk->sent = SCTP_DATAGRAM_UNSENT;
9852         chk->snd_count = 0;
9853         chk->whoTo = net;
9854         atomic_add_int(&chk->whoTo->ref_count, 1);
9855         /* Now we have a mbuf that we can fill in with the details */
9856         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
9857         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
9858         /* fill out chunk header */
9859         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
9860         hb->ch.chunk_flags = 0;
9861         hb->ch.chunk_length = htons(chk->send_size);
9862         /* Fill out hb parameter */
9863         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
9864         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
9865         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
9866         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
9867         /* Did our user request this one, put it in */
9868         hb->heartbeat.hb_info.user_req = user_req;
9869         hb->heartbeat.hb_info.addr_family = sin->sin_family;
9870         hb->heartbeat.hb_info.addr_len = sin->sin_len;
9871         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
9872                 /*
9873                  * we only take from the entropy pool if the address is not
9874                  * confirmed.
9875                  */
9876                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
9877                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
9878         } else {
9879                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
9880                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
9881         }
9882         if (sin->sin_family == AF_INET) {
9883                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
9884         } else if (sin->sin_family == AF_INET6) {
9885                 /* We leave the scope the way it is in our lookup table. */
9886                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
9887                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
9888         } else {
9889                 /* huh compiler bug */
9890                 return (0);
9891         }
9892
9893         /*
9894          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
9895          * PF-heartbeats.  Because of this, threshold management is done by
9896          * the t3 timer handler, and does not need to be done upon the send
9897          * of a PF-heartbeat. If CMT PF is on and the destination to which a
9898          * heartbeat is being sent is in PF state, do NOT do threshold
9899          * management.
9900          */
9901         if ((sctp_cmt_pf == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
9902                 /* ok we have a destination that needs a beat */
9903                 /* lets do the theshold management Qiaobing style */
9904                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
9905                     stcb->asoc.max_send_times)) {
9906                         /*-
9907                          * we have lost the association, in a way this is
9908                          * quite bad since we really are one less time since
9909                          * we really did not send yet. This is the down side
9910                          * to the Q's style as defined in the RFC and not my
9911                          * alternate style defined in the RFC.
9912                          */
9913                         if (chk->data != NULL) {
9914                                 sctp_m_freem(chk->data);
9915                                 chk->data = NULL;
9916                         }
9917                         /*
9918                          * Here we do NOT use the macro since the
9919                          * association is now gone.
9920                          */
9921                         if (chk->whoTo) {
9922                                 sctp_free_remote_addr(chk->whoTo);
9923                                 chk->whoTo = NULL;
9924                         }
9925                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
9926                         return (-1);
9927                 }
9928         }
9929         net->hb_responded = 0;
9930         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9931         stcb->asoc.ctrl_queue_cnt++;
9932         SCTP_STAT_INCR(sctps_sendheartbeat);
9933         /*-
9934          * Call directly med level routine to put out the chunk. It will
9935          * always tumble out control chunks aka HB but it may even tumble
9936          * out data too.
9937          */
9938         return (1);
9939 }
9940
9941 void
9942 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
9943     uint32_t high_tsn)
9944 {
9945         struct sctp_association *asoc;
9946         struct sctp_ecne_chunk *ecne;
9947         struct sctp_tmit_chunk *chk;
9948
9949         asoc = &stcb->asoc;
9950         SCTP_TCB_LOCK_ASSERT(stcb);
9951         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9952                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
9953                         /* found a previous ECN_ECHO update it if needed */
9954                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
9955                         ecne->tsn = htonl(high_tsn);
9956                         return;
9957                 }
9958         }
9959         /* nope could not find one to update so we must build one */
9960         sctp_alloc_a_chunk(stcb, chk);
9961         if (chk == NULL) {
9962                 return;
9963         }
9964         chk->copy_by_ref = 0;
9965         SCTP_STAT_INCR(sctps_sendecne);
9966         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
9967         chk->rec.chunk_id.can_take_data = 0;
9968         chk->asoc = &stcb->asoc;
9969         chk->send_size = sizeof(struct sctp_ecne_chunk);
9970         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
9971         if (chk->data == NULL) {
9972                 sctp_free_a_chunk(stcb, chk);
9973                 return;
9974         }
9975         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9976         SCTP_BUF_LEN(chk->data) = chk->send_size;
9977         chk->sent = SCTP_DATAGRAM_UNSENT;
9978         chk->snd_count = 0;
9979         chk->whoTo = net;
9980         atomic_add_int(&chk->whoTo->ref_count, 1);
9981         stcb->asoc.ecn_echo_cnt_onq++;
9982         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
9983         ecne->ch.chunk_type = SCTP_ECN_ECHO;
9984         ecne->ch.chunk_flags = 0;
9985         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
9986         ecne->tsn = htonl(high_tsn);
9987         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9988         asoc->ctrl_queue_cnt++;
9989 }
9990
9991 void
9992 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
9993     struct mbuf *m, int iphlen, int bad_crc)
9994 {
9995         struct sctp_association *asoc;
9996         struct sctp_pktdrop_chunk *drp;
9997         struct sctp_tmit_chunk *chk;
9998         uint8_t *datap;
9999         int len;
10000         int was_trunc = 0;
10001         struct ip *iph;
10002         int fullsz = 0, extra = 0;
10003         long spc;
10004         int offset;
10005         struct sctp_chunkhdr *ch, chunk_buf;
10006         unsigned int chk_length;
10007
10008         if (!stcb) {
10009                 return;
10010         }
10011         asoc = &stcb->asoc;
10012         SCTP_TCB_LOCK_ASSERT(stcb);
10013         if (asoc->peer_supports_pktdrop == 0) {
10014                 /*-
10015                  * peer must declare support before I send one.
10016                  */
10017                 return;
10018         }
10019         if (stcb->sctp_socket == NULL) {
10020                 return;
10021         }
10022         sctp_alloc_a_chunk(stcb, chk);
10023         if (chk == NULL) {
10024                 return;
10025         }
10026         chk->copy_by_ref = 0;
10027         iph = mtod(m, struct ip *);
10028         if (iph == NULL) {
10029                 sctp_free_a_chunk(stcb, chk);
10030                 return;
10031         }
10032         if (iph->ip_v == IPVERSION) {
10033                 /* IPv4 */
10034                 len = chk->send_size = iph->ip_len;
10035         } else {
10036                 struct ip6_hdr *ip6h;
10037
10038                 /* IPv6 */
10039                 ip6h = mtod(m, struct ip6_hdr *);
10040                 len = chk->send_size = htons(ip6h->ip6_plen);
10041         }
10042         /* Validate that we do not have an ABORT in here. */
10043         offset = iphlen + sizeof(struct sctphdr);
10044         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10045             sizeof(*ch), (uint8_t *) & chunk_buf);
10046         while (ch != NULL) {
10047                 chk_length = ntohs(ch->chunk_length);
10048                 if (chk_length < sizeof(*ch)) {
10049                         /* break to abort land */
10050                         break;
10051                 }
10052                 switch (ch->chunk_type) {
10053                 case SCTP_PACKET_DROPPED:
10054                 case SCTP_ABORT_ASSOCIATION:
10055                         /*-
10056                          * we don't respond with an PKT-DROP to an ABORT
10057                          * or PKT-DROP
10058                          */
10059                         sctp_free_a_chunk(stcb, chk);
10060                         return;
10061                 default:
10062                         break;
10063                 }
10064                 offset += SCTP_SIZE32(chk_length);
10065                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10066                     sizeof(*ch), (uint8_t *) & chunk_buf);
10067         }
10068
10069         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10070             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10071                 /*
10072                  * only send 1 mtu worth, trim off the excess on the end.
10073                  */
10074                 fullsz = len - extra;
10075                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10076                 was_trunc = 1;
10077         }
10078         chk->asoc = &stcb->asoc;
10079         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10080         if (chk->data == NULL) {
10081 jump_out:
10082                 sctp_free_a_chunk(stcb, chk);
10083                 return;
10084         }
10085         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10086         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10087         if (drp == NULL) {
10088                 sctp_m_freem(chk->data);
10089                 chk->data = NULL;
10090                 goto jump_out;
10091         }
10092         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10093             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10094         chk->book_size_scale = 0;
10095         if (was_trunc) {
10096                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
10097                 drp->trunc_len = htons(fullsz);
10098                 /*
10099                  * Len is already adjusted to size minus overhead above take
10100                  * out the pkt_drop chunk itself from it.
10101                  */
10102                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
10103                 len = chk->send_size;
10104         } else {
10105                 /* no truncation needed */
10106                 drp->ch.chunk_flags = 0;
10107                 drp->trunc_len = htons(0);
10108         }
10109         if (bad_crc) {
10110                 drp->ch.chunk_flags |= SCTP_BADCRC;
10111         }
10112         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
10113         SCTP_BUF_LEN(chk->data) = chk->send_size;
10114         chk->sent = SCTP_DATAGRAM_UNSENT;
10115         chk->snd_count = 0;
10116         if (net) {
10117                 /* we should hit here */
10118                 chk->whoTo = net;
10119         } else {
10120                 chk->whoTo = asoc->primary_destination;
10121         }
10122         atomic_add_int(&chk->whoTo->ref_count, 1);
10123         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
10124         chk->rec.chunk_id.can_take_data = 1;
10125         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
10126         drp->ch.chunk_length = htons(chk->send_size);
10127         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
10128         if (spc < 0) {
10129                 spc = 0;
10130         }
10131         drp->bottle_bw = htonl(spc);
10132         if (asoc->my_rwnd) {
10133                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
10134                     asoc->size_on_all_streams +
10135                     asoc->my_rwnd_control_len +
10136                     stcb->sctp_socket->so_rcv.sb_cc);
10137         } else {
10138                 /*-
10139                  * If my rwnd is 0, possibly from mbuf depletion as well as
10140                  * space used, tell the peer there is NO space aka onq == bw
10141                  */
10142                 drp->current_onq = htonl(spc);
10143         }
10144         drp->reserved = 0;
10145         datap = drp->data;
10146         m_copydata(m, iphlen, len, (caddr_t)datap);
10147         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10148         asoc->ctrl_queue_cnt++;
10149 }
10150
10151 void
10152 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
10153 {
10154         struct sctp_association *asoc;
10155         struct sctp_cwr_chunk *cwr;
10156         struct sctp_tmit_chunk *chk;
10157
10158         asoc = &stcb->asoc;
10159         SCTP_TCB_LOCK_ASSERT(stcb);
10160         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10161                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
10162                         /* found a previous ECN_CWR update it if needed */
10163                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10164                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
10165                             MAX_TSN)) {
10166                                 cwr->tsn = htonl(high_tsn);
10167                         }
10168                         return;
10169                 }
10170         }
10171         /* nope could not find one to update so we must build one */
10172         sctp_alloc_a_chunk(stcb, chk);
10173         if (chk == NULL) {
10174                 return;
10175         }
10176         chk->copy_by_ref = 0;
10177         chk->rec.chunk_id.id = SCTP_ECN_CWR;
10178         chk->rec.chunk_id.can_take_data = 1;
10179         chk->asoc = &stcb->asoc;
10180         chk->send_size = sizeof(struct sctp_cwr_chunk);
10181         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10182         if (chk->data == NULL) {
10183                 sctp_free_a_chunk(stcb, chk);
10184                 return;
10185         }
10186         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10187         SCTP_BUF_LEN(chk->data) = chk->send_size;
10188         chk->sent = SCTP_DATAGRAM_UNSENT;
10189         chk->snd_count = 0;
10190         chk->whoTo = net;
10191         atomic_add_int(&chk->whoTo->ref_count, 1);
10192         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10193         cwr->ch.chunk_type = SCTP_ECN_CWR;
10194         cwr->ch.chunk_flags = 0;
10195         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
10196         cwr->tsn = htonl(high_tsn);
10197         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10198         asoc->ctrl_queue_cnt++;
10199 }
10200
10201 void
10202 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
10203     int number_entries, uint16_t * list,
10204     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
10205 {
10206         int len, old_len, i;
10207         struct sctp_stream_reset_out_request *req_out;
10208         struct sctp_chunkhdr *ch;
10209
10210         ch = mtod(chk->data, struct sctp_chunkhdr *);
10211
10212
10213         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10214
10215         /* get to new offset for the param. */
10216         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
10217         /* now how long will this param be? */
10218         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
10219         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
10220         req_out->ph.param_length = htons(len);
10221         req_out->request_seq = htonl(seq);
10222         req_out->response_seq = htonl(resp_seq);
10223         req_out->send_reset_at_tsn = htonl(last_sent);
10224         if (number_entries) {
10225                 for (i = 0; i < number_entries; i++) {
10226                         req_out->list_of_streams[i] = htons(list[i]);
10227                 }
10228         }
10229         if (SCTP_SIZE32(len) > len) {
10230                 /*-
10231                  * Need to worry about the pad we may end up adding to the
10232                  * end. This is easy since the struct is either aligned to 4
10233                  * bytes or 2 bytes off.
10234                  */
10235                 req_out->list_of_streams[number_entries] = 0;
10236         }
10237         /* now fix the chunk length */
10238         ch->chunk_length = htons(len + old_len);
10239         chk->book_size = len + old_len;
10240         chk->book_size_scale = 0;
10241         chk->send_size = SCTP_SIZE32(chk->book_size);
10242         SCTP_BUF_LEN(chk->data) = chk->send_size;
10243         return;
10244 }
10245
10246
10247 void
10248 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
10249     int number_entries, uint16_t * list,
10250     uint32_t seq)
10251 {
10252         int len, old_len, i;
10253         struct sctp_stream_reset_in_request *req_in;
10254         struct sctp_chunkhdr *ch;
10255
10256         ch = mtod(chk->data, struct sctp_chunkhdr *);
10257
10258
10259         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10260
10261         /* get to new offset for the param. */
10262         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
10263         /* now how long will this param be? */
10264         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
10265         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
10266         req_in->ph.param_length = htons(len);
10267         req_in->request_seq = htonl(seq);
10268         if (number_entries) {
10269                 for (i = 0; i < number_entries; i++) {
10270                         req_in->list_of_streams[i] = htons(list[i]);
10271                 }
10272         }
10273         if (SCTP_SIZE32(len) > len) {
10274                 /*-
10275                  * Need to worry about the pad we may end up adding to the
10276                  * end. This is easy since the struct is either aligned to 4
10277                  * bytes or 2 bytes off.
10278                  */
10279                 req_in->list_of_streams[number_entries] = 0;
10280         }
10281         /* now fix the chunk length */
10282         ch->chunk_length = htons(len + old_len);
10283         chk->book_size = len + old_len;
10284         chk->book_size_scale = 0;
10285         chk->send_size = SCTP_SIZE32(chk->book_size);
10286         SCTP_BUF_LEN(chk->data) = chk->send_size;
10287         return;
10288 }
10289
10290
10291 void
10292 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
10293     uint32_t seq)
10294 {
10295         int len, old_len;
10296         struct sctp_stream_reset_tsn_request *req_tsn;
10297         struct sctp_chunkhdr *ch;
10298
10299         ch = mtod(chk->data, struct sctp_chunkhdr *);
10300
10301
10302         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10303
10304         /* get to new offset for the param. */
10305         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
10306         /* now how long will this param be? */
10307         len = sizeof(struct sctp_stream_reset_tsn_request);
10308         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
10309         req_tsn->ph.param_length = htons(len);
10310         req_tsn->request_seq = htonl(seq);
10311
10312         /* now fix the chunk length */
10313         ch->chunk_length = htons(len + old_len);
10314         chk->send_size = len + old_len;
10315         chk->book_size = SCTP_SIZE32(chk->send_size);
10316         chk->book_size_scale = 0;
10317         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
10318         return;
10319 }
10320
10321 void
10322 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
10323     uint32_t resp_seq, uint32_t result)
10324 {
10325         int len, old_len;
10326         struct sctp_stream_reset_response *resp;
10327         struct sctp_chunkhdr *ch;
10328
10329         ch = mtod(chk->data, struct sctp_chunkhdr *);
10330
10331
10332         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10333
10334         /* get to new offset for the param. */
10335         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
10336         /* now how long will this param be? */
10337         len = sizeof(struct sctp_stream_reset_response);
10338         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
10339         resp->ph.param_length = htons(len);
10340         resp->response_seq = htonl(resp_seq);
10341         resp->result = ntohl(result);
10342
10343         /* now fix the chunk length */
10344         ch->chunk_length = htons(len + old_len);
10345         chk->book_size = len + old_len;
10346         chk->book_size_scale = 0;
10347         chk->send_size = SCTP_SIZE32(chk->book_size);
10348         SCTP_BUF_LEN(chk->data) = chk->send_size;
10349         return;
10350
10351 }
10352
10353
10354 void
10355 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
10356     uint32_t resp_seq, uint32_t result,
10357     uint32_t send_una, uint32_t recv_next)
10358 {
10359         int len, old_len;
10360         struct sctp_stream_reset_response_tsn *resp;
10361         struct sctp_chunkhdr *ch;
10362
10363         ch = mtod(chk->data, struct sctp_chunkhdr *);
10364
10365
10366         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10367
10368         /* get to new offset for the param. */
10369         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
10370         /* now how long will this param be? */
10371         len = sizeof(struct sctp_stream_reset_response_tsn);
10372         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
10373         resp->ph.param_length = htons(len);
10374         resp->response_seq = htonl(resp_seq);
10375         resp->result = htonl(result);
10376         resp->senders_next_tsn = htonl(send_una);
10377         resp->receivers_next_tsn = htonl(recv_next);
10378
10379         /* now fix the chunk length */
10380         ch->chunk_length = htons(len + old_len);
10381         chk->book_size = len + old_len;
10382         chk->send_size = SCTP_SIZE32(chk->book_size);
10383         chk->book_size_scale = 0;
10384         SCTP_BUF_LEN(chk->data) = chk->send_size;
10385         return;
10386 }
10387
10388
10389 int
10390 sctp_send_str_reset_req(struct sctp_tcb *stcb,
10391     int number_entries, uint16_t * list,
10392     uint8_t send_out_req, uint32_t resp_seq,
10393     uint8_t send_in_req,
10394     uint8_t send_tsn_req)
10395 {
10396
10397         struct sctp_association *asoc;
10398         struct sctp_tmit_chunk *chk;
10399         struct sctp_chunkhdr *ch;
10400         uint32_t seq;
10401
10402         asoc = &stcb->asoc;
10403         if (asoc->stream_reset_outstanding) {
10404                 /*-
10405                  * Already one pending, must get ACK back to clear the flag.
10406                  */
10407                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
10408                 return (EBUSY);
10409         }
10410         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
10411                 /* nothing to do */
10412                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10413                 return (EINVAL);
10414         }
10415         if (send_tsn_req && (send_out_req || send_in_req)) {
10416                 /* error, can't do that */
10417                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10418                 return (EINVAL);
10419         }
10420         sctp_alloc_a_chunk(stcb, chk);
10421         if (chk == NULL) {
10422                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10423                 return (ENOMEM);
10424         }
10425         chk->copy_by_ref = 0;
10426         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
10427         chk->rec.chunk_id.can_take_data = 0;
10428         chk->asoc = &stcb->asoc;
10429         chk->book_size = sizeof(struct sctp_chunkhdr);
10430         chk->send_size = SCTP_SIZE32(chk->book_size);
10431         chk->book_size_scale = 0;
10432
10433         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10434         if (chk->data == NULL) {
10435                 sctp_free_a_chunk(stcb, chk);
10436                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10437                 return (ENOMEM);
10438         }
10439         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10440
10441         /* setup chunk parameters */
10442         chk->sent = SCTP_DATAGRAM_UNSENT;
10443         chk->snd_count = 0;
10444         chk->whoTo = asoc->primary_destination;
10445         atomic_add_int(&chk->whoTo->ref_count, 1);
10446
10447         ch = mtod(chk->data, struct sctp_chunkhdr *);
10448         ch->chunk_type = SCTP_STREAM_RESET;
10449         ch->chunk_flags = 0;
10450         ch->chunk_length = htons(chk->book_size);
10451         SCTP_BUF_LEN(chk->data) = chk->send_size;
10452
10453         seq = stcb->asoc.str_reset_seq_out;
10454         if (send_out_req) {
10455                 sctp_add_stream_reset_out(chk, number_entries, list,
10456                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
10457                 asoc->stream_reset_out_is_outstanding = 1;
10458                 seq++;
10459                 asoc->stream_reset_outstanding++;
10460         }
10461         if (send_in_req) {
10462                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
10463                 asoc->stream_reset_outstanding++;
10464         }
10465         if (send_tsn_req) {
10466                 sctp_add_stream_reset_tsn(chk, seq);
10467                 asoc->stream_reset_outstanding++;
10468         }
10469         asoc->str_reset = chk;
10470
10471         /* insert the chunk for sending */
10472         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
10473             chk,
10474             sctp_next);
10475         asoc->ctrl_queue_cnt++;
10476         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
10477         return (0);
10478 }
10479
10480 void
10481 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
10482     struct mbuf *err_cause, uint32_t vrf_id)
10483 {
10484         /*-
10485          * Formulate the abort message, and send it back down.
10486          */
10487         struct mbuf *o_pak;
10488         struct mbuf *mout;
10489         struct sctp_abort_msg *abm;
10490         struct ip *iph, *iph_out;
10491         struct ip6_hdr *ip6, *ip6_out;
10492         int iphlen_out, len;
10493
10494         /* don't respond to ABORT with ABORT */
10495         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
10496                 if (err_cause)
10497                         sctp_m_freem(err_cause);
10498                 return;
10499         }
10500         len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
10501
10502         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
10503         if (mout == NULL) {
10504                 if (err_cause)
10505                         sctp_m_freem(err_cause);
10506                 return;
10507         }
10508         iph = mtod(m, struct ip *);
10509         iph_out = NULL;
10510         ip6_out = NULL;
10511         if (iph->ip_v == IPVERSION) {
10512                 iph_out = mtod(mout, struct ip *);
10513                 SCTP_BUF_LEN(mout) = sizeof(*iph_out) + sizeof(*abm);
10514                 SCTP_BUF_NEXT(mout) = err_cause;
10515
10516                 /* Fill in the IP header for the ABORT */
10517                 iph_out->ip_v = IPVERSION;
10518                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10519                 iph_out->ip_tos = (u_char)0;
10520                 iph_out->ip_id = 0;
10521                 iph_out->ip_off = 0;
10522                 iph_out->ip_ttl = MAXTTL;
10523                 iph_out->ip_p = IPPROTO_SCTP;
10524                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10525                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10526                 /* let IP layer calculate this */
10527                 iph_out->ip_sum = 0;
10528
10529                 iphlen_out = sizeof(*iph_out);
10530                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
10531         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
10532                 ip6 = (struct ip6_hdr *)iph;
10533                 ip6_out = mtod(mout, struct ip6_hdr *);
10534                 SCTP_BUF_LEN(mout) = sizeof(*ip6_out) + sizeof(*abm);
10535                 SCTP_BUF_NEXT(mout) = err_cause;
10536
10537                 /* Fill in the IP6 header for the ABORT */
10538                 ip6_out->ip6_flow = ip6->ip6_flow;
10539                 ip6_out->ip6_hlim = ip6_defhlim;
10540                 ip6_out->ip6_nxt = IPPROTO_SCTP;
10541                 ip6_out->ip6_src = ip6->ip6_dst;
10542                 ip6_out->ip6_dst = ip6->ip6_src;
10543
10544                 iphlen_out = sizeof(*ip6_out);
10545                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
10546         } else {
10547                 /* Currently not supported */
10548                 if (err_cause)
10549                         sctp_m_freem(err_cause);
10550                 sctp_m_freem(mout);
10551                 return;
10552         }
10553
10554         abm->sh.src_port = sh->dest_port;
10555         abm->sh.dest_port = sh->src_port;
10556         abm->sh.checksum = 0;
10557         if (vtag == 0) {
10558                 abm->sh.v_tag = sh->v_tag;
10559                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
10560         } else {
10561                 abm->sh.v_tag = htonl(vtag);
10562                 abm->msg.ch.chunk_flags = 0;
10563         }
10564         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10565
10566         if (err_cause) {
10567                 struct mbuf *m_tmp = err_cause;
10568                 int err_len = 0;
10569
10570                 /* get length of the err_cause chain */
10571                 while (m_tmp != NULL) {
10572                         err_len += SCTP_BUF_LEN(m_tmp);
10573                         m_tmp = SCTP_BUF_NEXT(m_tmp);
10574                 }
10575                 len = SCTP_BUF_LEN(mout) + err_len;
10576                 if (err_len % 4) {
10577                         /* need pad at end of chunk */
10578                         uint32_t cpthis = 0;
10579                         int padlen;
10580
10581                         padlen = 4 - (len % 4);
10582                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
10583                         len += padlen;
10584                 }
10585                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
10586         } else {
10587                 len = SCTP_BUF_LEN(mout);
10588                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
10589         }
10590
10591         /* add checksum */
10592         abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
10593         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10594                 /* no mbuf's */
10595                 sctp_m_freem(mout);
10596                 return;
10597         }
10598         if (iph_out != NULL) {
10599                 sctp_route_t ro;
10600                 struct sctp_tcb *stcb = NULL;
10601                 int ret;
10602
10603                 /* zap the stack pointer to the route */
10604                 bzero(&ro, sizeof ro);
10605                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
10606                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
10607                 /* set IPv4 length */
10608                 iph_out->ip_len = len;
10609                 /* out it goes */
10610 #ifdef  SCTP_PACKET_LOGGING
10611                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10612                         sctp_packet_log(mout, len);
10613 #endif
10614                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10615                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10616
10617                 /* Free the route if we got one back */
10618                 if (ro.ro_rt)
10619                         RTFREE(ro.ro_rt);
10620         } else if (ip6_out != NULL) {
10621                 struct route_in6 ro;
10622                 int ret;
10623                 struct sctp_tcb *stcb = NULL;
10624                 struct ifnet *ifp = NULL;
10625
10626                 /* zap the stack pointer to the route */
10627                 bzero(&ro, sizeof(ro));
10628                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
10629                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
10630                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
10631 #ifdef  SCTP_PACKET_LOGGING
10632                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10633                         sctp_packet_log(mout, len);
10634 #endif
10635                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10636                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10637
10638                 /* Free the route if we got one back */
10639                 if (ro.ro_rt)
10640                         RTFREE(ro.ro_rt);
10641         }
10642         SCTP_STAT_INCR(sctps_sendpackets);
10643         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10644 }
10645
10646 void
10647 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
10648     uint32_t vrf_id)
10649 {
10650         struct mbuf *o_pak;
10651         struct sctphdr *ihdr;
10652         int retcode;
10653         struct sctphdr *ohdr;
10654         struct sctp_chunkhdr *ophdr;
10655         struct ip *iph;
10656         struct mbuf *mout;
10657
10658 #ifdef SCTP_DEBUG
10659         struct sockaddr_in6 lsa6, fsa6;
10660
10661 #endif
10662         uint32_t val;
10663         struct mbuf *at;
10664         int len;
10665
10666         iph = mtod(m, struct ip *);
10667         ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
10668
10669         SCTP_BUF_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
10670         if (scm == NULL) {
10671                 /* can't send because we can't add a mbuf */
10672                 return;
10673         }
10674         ohdr = mtod(scm, struct sctphdr *);
10675         ohdr->src_port = ihdr->dest_port;
10676         ohdr->dest_port = ihdr->src_port;
10677         ohdr->v_tag = vtag;
10678         ohdr->checksum = 0;
10679         ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
10680         ophdr->chunk_type = SCTP_OPERATION_ERROR;
10681         ophdr->chunk_flags = 0;
10682         len = 0;
10683         at = scm;
10684         while (at) {
10685                 len += SCTP_BUF_LEN(at);
10686                 at = SCTP_BUF_NEXT(at);
10687         }
10688         ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
10689         if (len % 4) {
10690                 /* need padding */
10691                 uint32_t cpthis = 0;
10692                 int padlen;
10693
10694                 padlen = 4 - (len % 4);
10695                 m_copyback(scm, len, padlen, (caddr_t)&cpthis);
10696                 len += padlen;
10697         }
10698         val = sctp_calculate_sum(scm, NULL, 0);
10699         mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
10700         if (mout == NULL) {
10701                 sctp_m_freem(scm);
10702                 return;
10703         }
10704         SCTP_BUF_NEXT(mout) = scm;
10705         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10706                 sctp_m_freem(mout);
10707                 return;
10708         }
10709         ohdr->checksum = val;
10710         if (iph->ip_v == IPVERSION) {
10711                 /* V4 */
10712                 struct ip *out;
10713                 sctp_route_t ro;
10714                 struct sctp_tcb *stcb = NULL;
10715
10716                 SCTP_BUF_LEN(mout) = sizeof(struct ip);
10717                 len += sizeof(struct ip);
10718
10719                 bzero(&ro, sizeof ro);
10720                 out = mtod(mout, struct ip *);
10721                 out->ip_v = iph->ip_v;
10722                 out->ip_hl = (sizeof(struct ip) / 4);
10723                 out->ip_tos = iph->ip_tos;
10724                 out->ip_id = iph->ip_id;
10725                 out->ip_off = 0;
10726                 out->ip_ttl = MAXTTL;
10727                 out->ip_p = IPPROTO_SCTP;
10728                 out->ip_sum = 0;
10729                 out->ip_src = iph->ip_dst;
10730                 out->ip_dst = iph->ip_src;
10731                 out->ip_len = len;
10732 #ifdef  SCTP_PACKET_LOGGING
10733                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10734                         sctp_packet_log(mout, len);
10735 #endif
10736                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10737
10738                 SCTP_IP_OUTPUT(retcode, o_pak, &ro, stcb, vrf_id);
10739
10740                 SCTP_STAT_INCR(sctps_sendpackets);
10741                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10742                 /* Free the route if we got one back */
10743                 if (ro.ro_rt)
10744                         RTFREE(ro.ro_rt);
10745         } else {
10746                 /* V6 */
10747                 struct route_in6 ro;
10748                 int ret;
10749                 struct sctp_tcb *stcb = NULL;
10750                 struct ifnet *ifp = NULL;
10751                 struct ip6_hdr *out6, *in6;
10752
10753                 SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr);
10754                 len += sizeof(struct ip6_hdr);
10755                 bzero(&ro, sizeof ro);
10756                 in6 = mtod(m, struct ip6_hdr *);
10757                 out6 = mtod(mout, struct ip6_hdr *);
10758                 out6->ip6_flow = in6->ip6_flow;
10759                 out6->ip6_hlim = ip6_defhlim;
10760                 out6->ip6_nxt = IPPROTO_SCTP;
10761                 out6->ip6_src = in6->ip6_dst;
10762                 out6->ip6_dst = in6->ip6_src;
10763                 out6->ip6_plen = len - sizeof(struct ip6_hdr);
10764
10765 #ifdef SCTP_DEBUG
10766                 bzero(&lsa6, sizeof(lsa6));
10767                 lsa6.sin6_len = sizeof(lsa6);
10768                 lsa6.sin6_family = AF_INET6;
10769                 lsa6.sin6_addr = out6->ip6_src;
10770                 bzero(&fsa6, sizeof(fsa6));
10771                 fsa6.sin6_len = sizeof(fsa6);
10772                 fsa6.sin6_family = AF_INET6;
10773                 fsa6.sin6_addr = out6->ip6_dst;
10774 #endif
10775                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_operr_to calling ipv6 output:\n");
10776                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "src: ");
10777                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&lsa6);
10778                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "dst ");
10779                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&fsa6);
10780
10781 #ifdef  SCTP_PACKET_LOGGING
10782                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10783                         sctp_packet_log(mout, len);
10784 #endif
10785                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10786                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10787
10788                 SCTP_STAT_INCR(sctps_sendpackets);
10789                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10790                 /* Free the route if we got one back */
10791                 if (ro.ro_rt)
10792                         RTFREE(ro.ro_rt);
10793         }
10794 }
10795
10796 static struct mbuf *
10797 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
10798     struct uio *uio,
10799     struct sctp_sndrcvinfo *srcv,
10800     int max_send_len,
10801     int user_marks_eor,
10802     int *error,
10803     uint32_t * sndout,
10804     struct mbuf **new_tail)
10805 {
10806         struct mbuf *m;
10807
10808         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
10809             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
10810         if (m == NULL) {
10811                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10812                 *error = ENOMEM;
10813         } else {
10814                 *sndout = m_length(m, NULL);
10815                 *new_tail = m_last(m);
10816         }
10817         return (m);
10818 }
10819
10820 static int
10821 sctp_copy_one(struct sctp_stream_queue_pending *sp,
10822     struct uio *uio,
10823     int resv_upfront)
10824 {
10825         int left;
10826
10827         left = sp->length;
10828         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
10829             resv_upfront, 0);
10830         if (sp->data == NULL) {
10831                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10832                 return (ENOMEM);
10833         }
10834         sp->tail_mbuf = m_last(sp->data);
10835         return (0);
10836 }
10837
10838
10839
10840 static struct sctp_stream_queue_pending *
10841 sctp_copy_it_in(struct sctp_tcb *stcb,
10842     struct sctp_association *asoc,
10843     struct sctp_sndrcvinfo *srcv,
10844     struct uio *uio,
10845     struct sctp_nets *net,
10846     int max_send_len,
10847     int user_marks_eor,
10848     int *error,
10849     int non_blocking)
10850 {
10851         /*-
10852          * This routine must be very careful in its work. Protocol
10853          * processing is up and running so care must be taken to spl...()
10854          * when you need to do something that may effect the stcb/asoc. The
10855          * sb is locked however. When data is copied the protocol processing
10856          * should be enabled since this is a slower operation...
10857          */
10858         struct sctp_stream_queue_pending *sp = NULL;
10859         int resv_in_first;
10860
10861         *error = 0;
10862         /* Now can we send this? */
10863         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
10864             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
10865             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
10866             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
10867                 /* got data while shutting down */
10868                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
10869                 *error = ECONNRESET;
10870                 goto out_now;
10871         }
10872         sctp_alloc_a_strmoq(stcb, sp);
10873         if (sp == NULL) {
10874                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10875                 *error = ENOMEM;
10876                 goto out_now;
10877         }
10878         sp->act_flags = 0;
10879         sp->sender_all_done = 0;
10880         sp->sinfo_flags = srcv->sinfo_flags;
10881         sp->timetolive = srcv->sinfo_timetolive;
10882         sp->ppid = srcv->sinfo_ppid;
10883         sp->context = srcv->sinfo_context;
10884         sp->strseq = 0;
10885         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
10886
10887         sp->stream = srcv->sinfo_stream;
10888         sp->length = min(uio->uio_resid, max_send_len);
10889         if ((sp->length == (uint32_t) uio->uio_resid) &&
10890             ((user_marks_eor == 0) ||
10891             (srcv->sinfo_flags & SCTP_EOF) ||
10892             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
10893                 sp->msg_is_complete = 1;
10894         } else {
10895                 sp->msg_is_complete = 0;
10896         }
10897         sp->sender_all_done = 0;
10898         sp->some_taken = 0;
10899         sp->put_last_out = 0;
10900         resv_in_first = sizeof(struct sctp_data_chunk);
10901         sp->data = sp->tail_mbuf = NULL;
10902         *error = sctp_copy_one(sp, uio, resv_in_first);
10903         if (*error) {
10904                 sctp_free_a_strmoq(stcb, sp);
10905                 sp = NULL;
10906         } else {
10907                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
10908                         sp->net = net;
10909                         sp->addr_over = 1;
10910                 } else {
10911                         sp->net = asoc->primary_destination;
10912                         sp->addr_over = 0;
10913                 }
10914                 atomic_add_int(&sp->net->ref_count, 1);
10915                 sctp_set_prsctp_policy(stcb, sp);
10916         }
10917 out_now:
10918         return (sp);
10919 }
10920
10921
10922 int
10923 sctp_sosend(struct socket *so,
10924     struct sockaddr *addr,
10925     struct uio *uio,
10926     struct mbuf *top,
10927     struct mbuf *control,
10928     int flags,
10929     struct thread *p
10930 )
10931 {
10932         struct sctp_inpcb *inp;
10933         int error, use_rcvinfo = 0;
10934         struct sctp_sndrcvinfo srcv;
10935
10936         inp = (struct sctp_inpcb *)so->so_pcb;
10937         if (control) {
10938                 /* process cmsg snd/rcv info (maybe a assoc-id) */
10939                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
10940                     sizeof(srcv))) {
10941                         /* got one */
10942                         use_rcvinfo = 1;
10943                 }
10944         }
10945         error = sctp_lower_sosend(so, addr, uio, top,
10946             control,
10947             flags,
10948             use_rcvinfo, &srcv
10949             ,p
10950             );
10951         return (error);
10952 }
10953
10954
10955 int
10956 sctp_lower_sosend(struct socket *so,
10957     struct sockaddr *addr,
10958     struct uio *uio,
10959     struct mbuf *i_pak,
10960     struct mbuf *control,
10961     int flags,
10962     int use_rcvinfo,
10963     struct sctp_sndrcvinfo *srcv
10964     ,
10965     struct thread *p
10966 )
10967 {
10968         unsigned int sndlen = 0, max_len;
10969         int error, len;
10970         struct mbuf *top = NULL;
10971         int queue_only = 0, queue_only_for_init = 0;
10972         int free_cnt_applied = 0;
10973         int un_sent = 0;
10974         int now_filled = 0;
10975         unsigned int inqueue_bytes = 0;
10976         struct sctp_block_entry be;
10977         struct sctp_inpcb *inp;
10978         struct sctp_tcb *stcb = NULL;
10979         struct timeval now;
10980         struct sctp_nets *net;
10981         struct sctp_association *asoc;
10982         struct sctp_inpcb *t_inp;
10983         int user_marks_eor;
10984         int create_lock_applied = 0;
10985         int nagle_applies = 0;
10986         int some_on_control = 0;
10987         int got_all_of_the_send = 0;
10988         int hold_tcblock = 0;
10989         int non_blocking = 0;
10990         int temp_flags = 0;
10991         uint32_t local_add_more, local_soresv = 0;
10992
10993         error = 0;
10994         net = NULL;
10995         stcb = NULL;
10996         asoc = NULL;
10997
10998         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
10999         if (inp == NULL) {
11000                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11001                 error = EFAULT;
11002                 if (i_pak) {
11003                         SCTP_RELEASE_PKT(i_pak);
11004                 }
11005                 return (error);
11006         }
11007         if ((uio == NULL) && (i_pak == NULL)) {
11008                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11009                 return (EINVAL);
11010         }
11011         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
11012         atomic_add_int(&inp->total_sends, 1);
11013         if (uio) {
11014                 if (uio->uio_resid < 0) {
11015                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11016                         return (EINVAL);
11017                 }
11018                 sndlen = uio->uio_resid;
11019         } else {
11020                 top = SCTP_HEADER_TO_CHAIN(i_pak);
11021                 sndlen = SCTP_HEADER_LEN(i_pak);
11022         }
11023         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
11024             addr,
11025             sndlen);
11026         /*-
11027          * Pre-screen address, if one is given the sin-len
11028          * must be set correctly!
11029          */
11030         if (addr) {
11031                 if ((addr->sa_family == AF_INET) &&
11032                     (addr->sa_len != sizeof(struct sockaddr_in))) {
11033                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11034                         error = EINVAL;
11035                         goto out_unlocked;
11036                 } else if ((addr->sa_family == AF_INET6) &&
11037                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
11038                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11039                         error = EINVAL;
11040                         goto out_unlocked;
11041                 }
11042         }
11043         hold_tcblock = 0;
11044
11045         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
11046             (inp->sctp_socket->so_qlimit)) {
11047                 /* The listener can NOT send */
11048                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11049                 error = EFAULT;
11050                 goto out_unlocked;
11051         }
11052         if ((use_rcvinfo) && srcv) {
11053                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
11054                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
11055                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11056                         error = EINVAL;
11057                         goto out_unlocked;
11058                 }
11059                 if (srcv->sinfo_flags)
11060                         SCTP_STAT_INCR(sctps_sends_with_flags);
11061
11062                 if (srcv->sinfo_flags & SCTP_SENDALL) {
11063                         /* its a sendall */
11064                         error = sctp_sendall(inp, uio, top, srcv);
11065                         top = NULL;
11066                         goto out_unlocked;
11067                 }
11068         }
11069         /* now we must find the assoc */
11070         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
11071             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
11072                 SCTP_INP_RLOCK(inp);
11073                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
11074                 if (stcb == NULL) {
11075                         SCTP_INP_RUNLOCK(inp);
11076                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11077                         error = ENOTCONN;
11078                         goto out_unlocked;
11079                 }
11080                 hold_tcblock = 0;
11081                 SCTP_INP_RUNLOCK(inp);
11082                 if (addr) {
11083                         /* Must locate the net structure if addr given */
11084                         net = sctp_findnet(stcb, addr);
11085                         if (net) {
11086                                 /* validate port was 0 or correct */
11087                                 struct sockaddr_in *sin;
11088
11089                                 sin = (struct sockaddr_in *)addr;
11090                                 if ((sin->sin_port != 0) &&
11091                                     (sin->sin_port != stcb->rport)) {
11092                                         net = NULL;
11093                                 }
11094                         }
11095                         temp_flags |= SCTP_ADDR_OVER;
11096                 } else
11097                         net = stcb->asoc.primary_destination;
11098                 if (addr && (net == NULL)) {
11099                         /* Could not find address, was it legal */
11100                         if (addr->sa_family == AF_INET) {
11101                                 struct sockaddr_in *sin;
11102
11103                                 sin = (struct sockaddr_in *)addr;
11104                                 if (sin->sin_addr.s_addr == 0) {
11105                                         if ((sin->sin_port == 0) ||
11106                                             (sin->sin_port == stcb->rport)) {
11107                                                 net = stcb->asoc.primary_destination;
11108                                         }
11109                                 }
11110                         } else {
11111                                 struct sockaddr_in6 *sin6;
11112
11113                                 sin6 = (struct sockaddr_in6 *)addr;
11114                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
11115                                         if ((sin6->sin6_port == 0) ||
11116                                             (sin6->sin6_port == stcb->rport)) {
11117                                                 net = stcb->asoc.primary_destination;
11118                                         }
11119                                 }
11120                         }
11121                 }
11122                 if (net == NULL) {
11123                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11124                         error = EINVAL;
11125                         goto out_unlocked;
11126                 }
11127         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
11128                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
11129                 if (stcb) {
11130                         if (addr)
11131                                 /*
11132                                  * Must locate the net structure if addr
11133                                  * given
11134                                  */
11135                                 net = sctp_findnet(stcb, addr);
11136                         else
11137                                 net = stcb->asoc.primary_destination;
11138                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
11139                             ((net == NULL) || (addr == NULL))) {
11140                                 struct sockaddr_in *sin;
11141
11142                                 if (addr == NULL) {
11143                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11144                                         error = EINVAL;
11145                                         goto out_unlocked;
11146                                 }
11147                                 sin = (struct sockaddr_in *)addr;
11148                                 /* Validate port is 0 or correct */
11149                                 if ((sin->sin_port != 0) &&
11150                                     (sin->sin_port != stcb->rport)) {
11151                                         net = NULL;
11152                                 }
11153                         }
11154                 }
11155                 hold_tcblock = 0;
11156         } else if (addr) {
11157                 /*-
11158                  * Since we did not use findep we must
11159                  * increment it, and if we don't find a tcb
11160                  * decrement it.
11161                  */
11162                 SCTP_INP_WLOCK(inp);
11163                 SCTP_INP_INCR_REF(inp);
11164                 SCTP_INP_WUNLOCK(inp);
11165                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11166                 if (stcb == NULL) {
11167                         SCTP_INP_WLOCK(inp);
11168                         SCTP_INP_DECR_REF(inp);
11169                         SCTP_INP_WUNLOCK(inp);
11170                 } else {
11171                         hold_tcblock = 1;
11172                 }
11173         }
11174         if ((stcb == NULL) && (addr)) {
11175                 /* Possible implicit send? */
11176                 SCTP_ASOC_CREATE_LOCK(inp);
11177                 create_lock_applied = 1;
11178                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
11179                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
11180                         /* Should I really unlock ? */
11181                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11182                         error = EFAULT;
11183                         goto out_unlocked;
11184
11185                 }
11186                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
11187                     (addr->sa_family == AF_INET6)) {
11188                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11189                         error = EINVAL;
11190                         goto out_unlocked;
11191                 }
11192                 SCTP_INP_WLOCK(inp);
11193                 SCTP_INP_INCR_REF(inp);
11194                 SCTP_INP_WUNLOCK(inp);
11195                 /* With the lock applied look again */
11196                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11197                 if (stcb == NULL) {
11198                         SCTP_INP_WLOCK(inp);
11199                         SCTP_INP_DECR_REF(inp);
11200                         SCTP_INP_WUNLOCK(inp);
11201                 } else {
11202                         hold_tcblock = 1;
11203                 }
11204                 if (t_inp != inp) {
11205                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11206                         error = ENOTCONN;
11207                         goto out_unlocked;
11208                 }
11209         }
11210         if (stcb == NULL) {
11211                 if (addr == NULL) {
11212                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
11213                         error = ENOENT;
11214                         goto out_unlocked;
11215                 } else {
11216                         /*
11217                          * UDP style, we must go ahead and start the INIT
11218                          * process
11219                          */
11220                         uint32_t vrf_id;
11221
11222                         if ((use_rcvinfo) && (srcv) &&
11223                             ((srcv->sinfo_flags & SCTP_ABORT) ||
11224                             ((srcv->sinfo_flags & SCTP_EOF) &&
11225                             (sndlen == 0)))) {
11226                                 /*-
11227                                  * User asks to abort a non-existant assoc,
11228                                  * or EOF a non-existant assoc with no data
11229                                  */
11230                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
11231                                 error = ENOENT;
11232                                 goto out_unlocked;
11233                         }
11234                         /* get an asoc/stcb struct */
11235                         vrf_id = inp->def_vrf_id;
11236 #ifdef INVARIANTS
11237                         if (create_lock_applied == 0) {
11238                                 panic("Error, should hold create lock and I don't?");
11239                         }
11240 #endif
11241                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
11242                             p
11243                             );
11244                         if (stcb == NULL) {
11245                                 /* Error is setup for us in the call */
11246                                 goto out_unlocked;
11247                         }
11248                         if (create_lock_applied) {
11249                                 SCTP_ASOC_CREATE_UNLOCK(inp);
11250                                 create_lock_applied = 0;
11251                         } else {
11252                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
11253                         }
11254                         /*
11255                          * Turn on queue only flag to prevent data from
11256                          * being sent
11257                          */
11258                         queue_only = 1;
11259                         asoc = &stcb->asoc;
11260                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
11261                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
11262
11263                         /* initialize authentication params for the assoc */
11264                         sctp_initialize_auth_params(inp, stcb);
11265
11266                         if (control) {
11267                                 /*
11268                                  * see if a init structure exists in cmsg
11269                                  * headers
11270                                  */
11271                                 struct sctp_initmsg initm;
11272                                 int i;
11273
11274                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
11275                                     sizeof(initm))) {
11276                                         /*
11277                                          * we have an INIT override of the
11278                                          * default
11279                                          */
11280                                         if (initm.sinit_max_attempts)
11281                                                 asoc->max_init_times = initm.sinit_max_attempts;
11282                                         if (initm.sinit_num_ostreams)
11283                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
11284                                         if (initm.sinit_max_instreams)
11285                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
11286                                         if (initm.sinit_max_init_timeo)
11287                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
11288                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
11289                                                 /* Default is NOT correct */
11290                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
11291                                                     asoc->streamoutcnt, asoc->pre_open_streams);
11292                                                 /*
11293                                                  * What happens if this
11294                                                  * fails? we panic ...
11295                                                  */
11296                                                 {
11297                                                         struct sctp_stream_out *tmp_str;
11298                                                         int had_lock = 0;
11299
11300                                                         if (hold_tcblock) {
11301                                                                 had_lock = 1;
11302                                                                 SCTP_TCB_UNLOCK(stcb);
11303                                                         }
11304                                                         SCTP_MALLOC(tmp_str,
11305                                                             struct sctp_stream_out *,
11306                                                             (asoc->pre_open_streams *
11307                                                             sizeof(struct sctp_stream_out)),
11308                                                             SCTP_M_STRMO);
11309                                                         if (had_lock) {
11310                                                                 SCTP_TCB_LOCK(stcb);
11311                                                         }
11312                                                         if (tmp_str != NULL) {
11313                                                                 SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
11314                                                                 asoc->strmout = tmp_str;
11315                                                                 asoc->streamoutcnt = asoc->pre_open_streams;
11316                                                         } else {
11317                                                                 asoc->pre_open_streams = asoc->streamoutcnt;
11318                                                         }
11319                                                 }
11320                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
11321                                                         /*-
11322                                                          * inbound side must be set
11323                                                          * to 0xffff, also NOTE when
11324                                                          * we get the INIT-ACK back
11325                                                          * (for INIT sender) we MUST
11326                                                          * reduce the count
11327                                                          * (streamoutcnt) but first
11328                                                          * check if we sent to any
11329                                                          * of the upper streams that
11330                                                          * were dropped (if some
11331                                                          * were). Those that were
11332                                                          * dropped must be notified
11333                                                          * to the upper layer as
11334                                                          * failed to send.
11335                                                          */
11336                                                         asoc->strmout[i].next_sequence_sent = 0x0;
11337                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
11338                                                         asoc->strmout[i].stream_no = i;
11339                                                         asoc->strmout[i].last_msg_incomplete = 0;
11340                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
11341                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
11342                                                 }
11343                                         }
11344                                 }
11345                         }
11346                         hold_tcblock = 1;
11347                         /* out with the INIT */
11348                         queue_only_for_init = 1;
11349                         /*-
11350                          * we may want to dig in after this call and adjust the MTU
11351                          * value. It defaulted to 1500 (constant) but the ro
11352                          * structure may now have an update and thus we may need to
11353                          * change it BEFORE we append the message.
11354                          */
11355                         net = stcb->asoc.primary_destination;
11356                         asoc = &stcb->asoc;
11357                 }
11358         }
11359         if ((SCTP_SO_IS_NBIO(so)
11360             || (flags & MSG_NBIO)
11361             )) {
11362                 non_blocking = 1;
11363         }
11364         asoc = &stcb->asoc;
11365
11366         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
11367                 if (sndlen > asoc->smallest_mtu) {
11368                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11369                         error = EMSGSIZE;
11370                         goto out_unlocked;
11371                 }
11372         }
11373         /* would we block? */
11374         if (non_blocking) {
11375                 if (hold_tcblock == 0) {
11376                         SCTP_TCB_LOCK(stcb);
11377                         hold_tcblock = 1;
11378                 }
11379                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11380                 if ((SCTP_SB_LIMIT_SND(so) <
11381                     (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
11382                     (stcb->asoc.chunks_on_out_queue >
11383                     sctp_max_chunks_on_queue)) {
11384                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
11385                         if (sndlen > SCTP_SB_LIMIT_SND(so))
11386                                 error = EMSGSIZE;
11387                         else
11388                                 error = EWOULDBLOCK;
11389                         goto out_unlocked;
11390                 }
11391                 stcb->asoc.sb_send_resv += sndlen;
11392                 SCTP_TCB_UNLOCK(stcb);
11393                 hold_tcblock = 0;
11394         } else {
11395                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
11396         }
11397         local_soresv = sndlen;
11398         /* Keep the stcb from being freed under our feet */
11399         if (free_cnt_applied) {
11400 #ifdef INVARIANTS
11401                 panic("refcnt already incremented");
11402 #else
11403                 printf("refcnt:1 already incremented?\n");
11404 #endif
11405         } else {
11406                 atomic_add_int(&stcb->asoc.refcnt, 1);
11407                 free_cnt_applied = 1;
11408         }
11409         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11410                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11411                 error = ECONNRESET;
11412                 goto out_unlocked;
11413         }
11414         if (create_lock_applied) {
11415                 SCTP_ASOC_CREATE_UNLOCK(inp);
11416                 create_lock_applied = 0;
11417         }
11418         if (asoc->stream_reset_outstanding) {
11419                 /*
11420                  * Can't queue any data while stream reset is underway.
11421                  */
11422                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
11423                 error = EAGAIN;
11424                 goto out_unlocked;
11425         }
11426         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
11427             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
11428                 queue_only = 1;
11429         }
11430         if ((use_rcvinfo == 0) || (srcv == NULL)) {
11431                 /* Grab the default stuff from the asoc */
11432                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
11433         }
11434         /* we are now done with all control */
11435         if (control) {
11436                 sctp_m_freem(control);
11437                 control = NULL;
11438         }
11439         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11440             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11441             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11442             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11443                 if ((use_rcvinfo) &&
11444                     (srcv->sinfo_flags & SCTP_ABORT)) {
11445                         ;
11446                 } else {
11447                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11448                         error = ECONNRESET;
11449                         goto out_unlocked;
11450                 }
11451         }
11452         /* Ok, we will attempt a msgsnd :> */
11453         if (p) {
11454                 p->td_ru.ru_msgsnd++;
11455         }
11456         if (stcb) {
11457                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
11458                         net = stcb->asoc.primary_destination;
11459                 }
11460         }
11461         if (net == NULL) {
11462                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11463                 error = EINVAL;
11464                 goto out_unlocked;
11465         }
11466         if ((net->flight_size > net->cwnd) && (sctp_cmt_on_off == 0)) {
11467                 /*-
11468                  * CMT: Added check for CMT above. net above is the primary
11469                  * dest. If CMT is ON, sender should always attempt to send
11470                  * with the output routine sctp_fill_outqueue() that loops
11471                  * through all destination addresses. Therefore, if CMT is
11472                  * ON, queue_only is NOT set to 1 here, so that
11473                  * sctp_chunk_output() can be called below.
11474                  */
11475                 queue_only = 1;
11476
11477         } else if (asoc->ifp_had_enobuf) {
11478                 SCTP_STAT_INCR(sctps_ifnomemqueued);
11479                 if (net->flight_size > (net->mtu * 2))
11480                         queue_only = 1;
11481                 asoc->ifp_had_enobuf = 0;
11482         } else {
11483                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11484                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
11485         }
11486         /* Are we aborting? */
11487         if (srcv->sinfo_flags & SCTP_ABORT) {
11488                 struct mbuf *mm;
11489                 int tot_demand, tot_out = 0, max_out;
11490
11491                 SCTP_STAT_INCR(sctps_sends_with_abort);
11492                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
11493                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
11494                         /* It has to be up before we abort */
11495                         /* how big is the user initiated abort? */
11496                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11497                         error = EINVAL;
11498                         goto out;
11499                 }
11500                 if (hold_tcblock) {
11501                         SCTP_TCB_UNLOCK(stcb);
11502                         hold_tcblock = 0;
11503                 }
11504                 if (top) {
11505                         struct mbuf *cntm = NULL;
11506
11507                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
11508                         if (sndlen != 0) {
11509                                 cntm = top;
11510                                 while (cntm) {
11511                                         tot_out += SCTP_BUF_LEN(cntm);
11512                                         cntm = SCTP_BUF_NEXT(cntm);
11513                                 }
11514                         }
11515                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
11516                 } else {
11517                         /* Must fit in a MTU */
11518                         tot_out = sndlen;
11519                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
11520                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
11521                                 /* To big */
11522                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11523                                 error = EMSGSIZE;
11524                                 goto out;
11525                         }
11526                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
11527                 }
11528                 if (mm == NULL) {
11529                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11530                         error = ENOMEM;
11531                         goto out;
11532                 }
11533                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
11534                 max_out -= sizeof(struct sctp_abort_msg);
11535                 if (tot_out > max_out) {
11536                         tot_out = max_out;
11537                 }
11538                 if (mm) {
11539                         struct sctp_paramhdr *ph;
11540
11541                         /* now move forward the data pointer */
11542                         ph = mtod(mm, struct sctp_paramhdr *);
11543                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
11544                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
11545                         ph++;
11546                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
11547                         if (top == NULL) {
11548                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
11549                                 if (error) {
11550                                         /*-
11551                                          * Here if we can't get his data we
11552                                          * still abort we just don't get to
11553                                          * send the users note :-0
11554                                          */
11555                                         sctp_m_freem(mm);
11556                                         mm = NULL;
11557                                 }
11558                         } else {
11559                                 if (sndlen != 0) {
11560                                         SCTP_BUF_NEXT(mm) = top;
11561                                 }
11562                         }
11563                 }
11564                 if (hold_tcblock == 0) {
11565                         SCTP_TCB_LOCK(stcb);
11566                         hold_tcblock = 1;
11567                 }
11568                 atomic_add_int(&stcb->asoc.refcnt, -1);
11569                 free_cnt_applied = 0;
11570                 /* release this lock, otherwise we hang on ourselves */
11571                 sctp_abort_an_association(stcb->sctp_ep, stcb,
11572                     SCTP_RESPONSE_TO_USER_REQ,
11573                     mm, SCTP_SO_LOCKED);
11574                 /* now relock the stcb so everything is sane */
11575                 hold_tcblock = 0;
11576                 stcb = NULL;
11577                 /*
11578                  * In this case top is already chained to mm avoid double
11579                  * free, since we free it below if top != NULL and driver
11580                  * would free it after sending the packet out
11581                  */
11582                 if (sndlen != 0) {
11583                         top = NULL;
11584                 }
11585                 goto out_unlocked;
11586         }
11587         /* Calculate the maximum we can send */
11588         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11589         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
11590                 if (non_blocking) {
11591                         /* we already checked for non-blocking above. */
11592                         max_len = sndlen;
11593                 } else {
11594                         max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
11595                 }
11596         } else {
11597                 max_len = 0;
11598         }
11599         if (hold_tcblock) {
11600                 SCTP_TCB_UNLOCK(stcb);
11601                 hold_tcblock = 0;
11602         }
11603         /* Is the stream no. valid? */
11604         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
11605                 /* Invalid stream number */
11606                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11607                 error = EINVAL;
11608                 goto out_unlocked;
11609         }
11610         if (asoc->strmout == NULL) {
11611                 /* huh? software error */
11612                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11613                 error = EFAULT;
11614                 goto out_unlocked;
11615         }
11616         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
11617         if ((user_marks_eor == 0) &&
11618             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
11619                 /* It will NEVER fit */
11620                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11621                 error = EMSGSIZE;
11622                 goto out_unlocked;
11623         }
11624         if ((uio == NULL) && user_marks_eor) {
11625                 /*-
11626                  * We do not support eeor mode for
11627                  * sending with mbuf chains (like sendfile).
11628                  */
11629                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11630                 error = EINVAL;
11631                 goto out_unlocked;
11632         }
11633         if (user_marks_eor) {
11634                 local_add_more = sctp_add_more_threshold;
11635         } else {
11636                 /*-
11637                  * For non-eeor the whole message must fit in
11638                  * the socket send buffer.
11639                  */
11640                 local_add_more = sndlen;
11641         }
11642         len = 0;
11643         if (non_blocking) {
11644                 goto skip_preblock;
11645         }
11646         if (((max_len <= local_add_more) &&
11647             (SCTP_SB_LIMIT_SND(so) > local_add_more)) ||
11648             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) > sctp_max_chunks_on_queue)) {      /* if */
11649                 /* No room right no ! */
11650                 SOCKBUF_LOCK(&so->so_snd);
11651                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11652                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + sctp_add_more_threshold)) ||
11653                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) > sctp_max_chunks_on_queue /* while */ )) {
11654
11655                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11656                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA,
11657                                     so, asoc, sndlen);
11658                         }
11659                         be.error = 0;
11660                         stcb->block_entry = &be;
11661                         error = sbwait(&so->so_snd);
11662                         stcb->block_entry = NULL;
11663                         if (error || so->so_error || be.error) {
11664                                 if (error == 0) {
11665                                         if (so->so_error)
11666                                                 error = so->so_error;
11667                                         if (be.error) {
11668                                                 error = be.error;
11669                                         }
11670                                 }
11671                                 SOCKBUF_UNLOCK(&so->so_snd);
11672                                 goto out_unlocked;
11673                         }
11674                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11675                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
11676                                     so, asoc, stcb->asoc.total_output_queue_size);
11677                         }
11678                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11679                                 goto out_unlocked;
11680                         }
11681                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11682                 }
11683                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11684                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
11685                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
11686                 } else {
11687                         max_len = 0;
11688                 }
11689                 SOCKBUF_UNLOCK(&so->so_snd);
11690         }
11691 skip_preblock:
11692         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11693                 goto out_unlocked;
11694         }
11695         atomic_add_int(&stcb->total_sends, 1);
11696         /*
11697          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
11698          * case NOTE: uio will be null when top/mbuf is passed
11699          */
11700         if (sndlen == 0) {
11701                 if (srcv->sinfo_flags & SCTP_EOF) {
11702                         got_all_of_the_send = 1;
11703                         goto dataless_eof;
11704                 } else {
11705                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11706                         error = EINVAL;
11707                         goto out;
11708                 }
11709         }
11710         if (top == NULL) {
11711                 struct sctp_stream_queue_pending *sp;
11712                 struct sctp_stream_out *strm;
11713                 uint32_t sndout, initial_out;
11714
11715                 initial_out = uio->uio_resid;
11716
11717                 SCTP_TCB_SEND_LOCK(stcb);
11718                 if ((asoc->stream_locked) &&
11719                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
11720                         SCTP_TCB_SEND_UNLOCK(stcb);
11721                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11722                         error = EINVAL;
11723                         goto out;
11724                 }
11725                 SCTP_TCB_SEND_UNLOCK(stcb);
11726
11727                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
11728                 if (strm->last_msg_incomplete == 0) {
11729         do_a_copy_in:
11730                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
11731                         if ((sp == NULL) || (error)) {
11732                                 goto out;
11733                         }
11734                         SCTP_TCB_SEND_LOCK(stcb);
11735                         if (sp->msg_is_complete) {
11736                                 strm->last_msg_incomplete = 0;
11737                                 asoc->stream_locked = 0;
11738                         } else {
11739                                 /*
11740                                  * Just got locked to this guy in case of an
11741                                  * interrupt.
11742                                  */
11743                                 strm->last_msg_incomplete = 1;
11744                                 asoc->stream_locked = 1;
11745                                 asoc->stream_locked_on = srcv->sinfo_stream;
11746                                 sp->sender_all_done = 0;
11747                         }
11748                         sctp_snd_sb_alloc(stcb, sp->length);
11749                         atomic_add_int(&asoc->stream_queue_cnt, 1);
11750                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
11751                                 sp->strseq = strm->next_sequence_sent;
11752                                 if (sctp_logging_level & SCTP_LOG_AT_SEND_2_SCTP) {
11753                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
11754                                             (uintptr_t) stcb, sp->length,
11755                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
11756                                 }
11757                                 strm->next_sequence_sent++;
11758                         } else {
11759                                 SCTP_STAT_INCR(sctps_sends_with_unord);
11760                         }
11761                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
11762                         if ((strm->next_spoke.tqe_next == NULL) &&
11763                             (strm->next_spoke.tqe_prev == NULL)) {
11764                                 /* Not on wheel, insert */
11765                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
11766                         }
11767                         SCTP_TCB_SEND_UNLOCK(stcb);
11768                 } else {
11769                         SCTP_TCB_SEND_LOCK(stcb);
11770                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
11771                         SCTP_TCB_SEND_UNLOCK(stcb);
11772                         if (sp == NULL) {
11773                                 /* ???? Huh ??? last msg is gone */
11774 #ifdef INVARIANTS
11775                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
11776 #else
11777                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
11778                                 strm->last_msg_incomplete = 0;
11779 #endif
11780                                 goto do_a_copy_in;
11781
11782                         }
11783                 }
11784                 while (uio->uio_resid > 0) {
11785                         /* How much room do we have? */
11786                         struct mbuf *new_tail, *mm;
11787
11788                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
11789                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
11790                         else
11791                                 max_len = 0;
11792
11793                         if ((max_len > sctp_add_more_threshold) ||
11794                             (max_len && (SCTP_SB_LIMIT_SND(so) < sctp_add_more_threshold)) ||
11795                             (uio->uio_resid &&
11796                             (uio->uio_resid <= (int)max_len))) {
11797                                 sndout = 0;
11798                                 new_tail = NULL;
11799                                 if (hold_tcblock) {
11800                                         SCTP_TCB_UNLOCK(stcb);
11801                                         hold_tcblock = 0;
11802                                 }
11803                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
11804                                 if ((mm == NULL) || error) {
11805                                         if (mm) {
11806                                                 sctp_m_freem(mm);
11807                                         }
11808                                         goto out;
11809                                 }
11810                                 /* Update the mbuf and count */
11811                                 SCTP_TCB_SEND_LOCK(stcb);
11812                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11813                                         /*
11814                                          * we need to get out. Peer probably
11815                                          * aborted.
11816                                          */
11817                                         sctp_m_freem(mm);
11818                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
11819                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11820                                                 error = ECONNRESET;
11821                                         }
11822                                         SCTP_TCB_SEND_UNLOCK(stcb);
11823                                         goto out;
11824                                 }
11825                                 if (sp->tail_mbuf) {
11826                                         /* tack it to the end */
11827                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
11828                                         sp->tail_mbuf = new_tail;
11829                                 } else {
11830                                         /* A stolen mbuf */
11831                                         sp->data = mm;
11832                                         sp->tail_mbuf = new_tail;
11833                                 }
11834                                 sctp_snd_sb_alloc(stcb, sndout);
11835                                 atomic_add_int(&sp->length, sndout);
11836                                 len += sndout;
11837
11838                                 /* Did we reach EOR? */
11839                                 if ((uio->uio_resid == 0) &&
11840                                     ((user_marks_eor == 0) ||
11841                                     (srcv->sinfo_flags & SCTP_EOF) ||
11842                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
11843                                     ) {
11844                                         sp->msg_is_complete = 1;
11845                                 } else {
11846                                         sp->msg_is_complete = 0;
11847                                 }
11848                                 SCTP_TCB_SEND_UNLOCK(stcb);
11849                         }
11850                         if (uio->uio_resid == 0) {
11851                                 /* got it all? */
11852                                 continue;
11853                         }
11854                         /* PR-SCTP? */
11855                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
11856                                 /*
11857                                  * This is ugly but we must assure locking
11858                                  * order
11859                                  */
11860                                 if (hold_tcblock == 0) {
11861                                         SCTP_TCB_LOCK(stcb);
11862                                         hold_tcblock = 1;
11863                                 }
11864                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
11865                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11866                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
11867                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
11868                                 else
11869                                         max_len = 0;
11870                                 if (max_len > 0) {
11871                                         continue;
11872                                 }
11873                                 SCTP_TCB_UNLOCK(stcb);
11874                                 hold_tcblock = 0;
11875                         }
11876                         /* wait for space now */
11877                         if (non_blocking) {
11878                                 /* Non-blocking io in place out */
11879                                 goto skip_out_eof;
11880                         }
11881                         if ((net->flight_size > net->cwnd) &&
11882                             (sctp_cmt_on_off == 0)) {
11883                                 queue_only = 1;
11884                         } else if (asoc->ifp_had_enobuf) {
11885                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
11886                                 if (net->flight_size > (net->mtu * 2)) {
11887                                         queue_only = 1;
11888                                 } else {
11889                                         queue_only = 0;
11890                                 }
11891                                 asoc->ifp_had_enobuf = 0;
11892                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11893                                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
11894                                     sizeof(struct sctp_data_chunk)));
11895                         } else {
11896                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11897                                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
11898                                     sizeof(struct sctp_data_chunk)));
11899                                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
11900                                         queue_only = 1;
11901                                         SCTP_STAT_INCR(sctps_send_burst_avoid);
11902                                 } else if (net->flight_size > net->cwnd) {
11903                                         queue_only = 1;
11904                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
11905                                 } else {
11906                                         queue_only = 0;
11907                                 }
11908                         }
11909                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
11910                             (stcb->asoc.total_flight > 0) &&
11911                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
11912                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
11913                             ) {
11914
11915                                 /*-
11916                                  * Ok, Nagle is set on and we have data outstanding.
11917                                  * Don't send anything and let SACKs drive out the
11918                                  * data unless wen have a "full" segment to send.
11919                                  */
11920                                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
11921                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
11922                                 }
11923                                 SCTP_STAT_INCR(sctps_naglequeued);
11924                                 nagle_applies = 1;
11925                         } else {
11926                                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
11927                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
11928                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
11929                                 }
11930                                 SCTP_STAT_INCR(sctps_naglesent);
11931                                 nagle_applies = 0;
11932                         }
11933                         /* What about the INIT, send it maybe */
11934                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11935
11936                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
11937                                     nagle_applies, un_sent);
11938                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
11939                                     stcb->asoc.total_flight,
11940                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
11941                         }
11942                         if (queue_only_for_init) {
11943                                 if (hold_tcblock == 0) {
11944                                         SCTP_TCB_LOCK(stcb);
11945                                         hold_tcblock = 1;
11946                                 }
11947                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
11948                                         /* a collision took us forward? */
11949                                         queue_only_for_init = 0;
11950                                         queue_only = 0;
11951                                 } else {
11952                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
11953                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
11954                                         queue_only_for_init = 0;
11955                                         queue_only = 1;
11956                                 }
11957                         }
11958                         if ((queue_only == 0) && (nagle_applies == 0)
11959                             ) {
11960                                 /*-
11961                                  * need to start chunk output
11962                                  * before blocking.. note that if
11963                                  * a lock is already applied, then
11964                                  * the input via the net is happening
11965                                  * and I don't need to start output :-D
11966                                  */
11967                                 if (hold_tcblock == 0) {
11968                                         if (SCTP_TCB_TRYLOCK(stcb)) {
11969                                                 hold_tcblock = 1;
11970                                                 sctp_chunk_output(inp,
11971                                                     stcb,
11972                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
11973                                         }
11974                                 } else {
11975                                         sctp_chunk_output(inp,
11976                                             stcb,
11977                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
11978                                 }
11979                                 if (hold_tcblock == 1) {
11980                                         SCTP_TCB_UNLOCK(stcb);
11981                                         hold_tcblock = 0;
11982                                 }
11983                         }
11984                         SOCKBUF_LOCK(&so->so_snd);
11985                         /*-
11986                          * This is a bit strange, but I think it will
11987                          * work. The total_output_queue_size is locked and
11988                          * protected by the TCB_LOCK, which we just released.
11989                          * There is a race that can occur between releasing it
11990                          * above, and me getting the socket lock, where sacks
11991                          * come in but we have not put the SB_WAIT on the
11992                          * so_snd buffer to get the wakeup. After the LOCK
11993                          * is applied the sack_processing will also need to
11994                          * LOCK the so->so_snd to do the actual sowwakeup(). So
11995                          * once we have the socket buffer lock if we recheck the
11996                          * size we KNOW we will get to sleep safely with the
11997                          * wakeup flag in place.
11998                          */
11999                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12000                             min(sctp_add_more_threshold, SCTP_SB_LIMIT_SND(so)))
12001                             ) {
12002                                 if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
12003                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12004                                             so, asoc, uio->uio_resid);
12005                                 }
12006                                 be.error = 0;
12007                                 stcb->block_entry = &be;
12008                                 error = sbwait(&so->so_snd);
12009                                 stcb->block_entry = NULL;
12010
12011                                 if (error || so->so_error || be.error) {
12012                                         if (error == 0) {
12013                                                 if (so->so_error)
12014                                                         error = so->so_error;
12015                                                 if (be.error) {
12016                                                         error = be.error;
12017                                                 }
12018                                         }
12019                                         SOCKBUF_UNLOCK(&so->so_snd);
12020                                         goto out_unlocked;
12021                                 }
12022                                 if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
12023                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12024                                             so, asoc, stcb->asoc.total_output_queue_size);
12025                                 }
12026                         }
12027                         SOCKBUF_UNLOCK(&so->so_snd);
12028                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12029                                 goto out_unlocked;
12030                         }
12031                 }
12032                 SCTP_TCB_SEND_LOCK(stcb);
12033                 if (sp) {
12034                         if (sp->msg_is_complete == 0) {
12035                                 strm->last_msg_incomplete = 1;
12036                                 asoc->stream_locked = 1;
12037                                 asoc->stream_locked_on = srcv->sinfo_stream;
12038                         } else {
12039                                 sp->sender_all_done = 1;
12040                                 strm->last_msg_incomplete = 0;
12041                                 asoc->stream_locked = 0;
12042                         }
12043                 } else {
12044                         SCTP_PRINTF("Huh no sp TSNH?\n");
12045                         strm->last_msg_incomplete = 0;
12046                         asoc->stream_locked = 0;
12047                 }
12048                 SCTP_TCB_SEND_UNLOCK(stcb);
12049                 if (uio->uio_resid == 0) {
12050                         got_all_of_the_send = 1;
12051                 }
12052         } else if (top) {
12053                 /* We send in a 0, since we do NOT have any locks */
12054                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12055                 top = NULL;
12056                 if (srcv->sinfo_flags & SCTP_EOF) {
12057                         /*
12058                          * This should only happen for Panda for the mbuf
12059                          * send case, which does NOT yet support EEOR mode.
12060                          * Thus, we can just set this flag to do the proper
12061                          * EOF handling.
12062                          */
12063                         got_all_of_the_send = 1;
12064                 }
12065         }
12066         if (error) {
12067                 goto out;
12068         }
12069 dataless_eof:
12070         /* EOF thing ? */
12071         if ((srcv->sinfo_flags & SCTP_EOF) &&
12072             (got_all_of_the_send == 1) &&
12073             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)
12074             ) {
12075                 int cnt;
12076
12077                 SCTP_STAT_INCR(sctps_sends_with_eof);
12078                 error = 0;
12079                 if (hold_tcblock == 0) {
12080                         SCTP_TCB_LOCK(stcb);
12081                         hold_tcblock = 1;
12082                 }
12083                 cnt = sctp_is_there_unsent_data(stcb);
12084                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12085                     TAILQ_EMPTY(&asoc->sent_queue) &&
12086                     (cnt == 0)) {
12087                         if (asoc->locked_on_sending) {
12088                                 goto abort_anyway;
12089                         }
12090                         /* there is nothing queued to send, so I'm done... */
12091                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12092                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12093                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12094                                 /* only send SHUTDOWN the first time through */
12095                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
12096                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
12097                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
12098                                 }
12099                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
12100                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
12101                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
12102                                     asoc->primary_destination);
12103                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12104                                     asoc->primary_destination);
12105                         }
12106                 } else {
12107                         /*-
12108                          * we still got (or just got) data to send, so set
12109                          * SHUTDOWN_PENDING
12110                          */
12111                         /*-
12112                          * XXX sockets draft says that SCTP_EOF should be
12113                          * sent with no data.  currently, we will allow user
12114                          * data to be sent first and move to
12115                          * SHUTDOWN-PENDING
12116                          */
12117                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12118                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12119                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12120                                 if (hold_tcblock == 0) {
12121                                         SCTP_TCB_LOCK(stcb);
12122                                         hold_tcblock = 1;
12123                                 }
12124                                 if (asoc->locked_on_sending) {
12125                                         /* Locked to send out the data */
12126                                         struct sctp_stream_queue_pending *sp;
12127
12128                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
12129                                         if (sp) {
12130                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
12131                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
12132                                         }
12133                                 }
12134                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
12135                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12136                                     TAILQ_EMPTY(&asoc->sent_queue) &&
12137                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
12138                         abort_anyway:
12139                                         if (free_cnt_applied) {
12140                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
12141                                                 free_cnt_applied = 0;
12142                                         }
12143                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
12144                                             SCTP_RESPONSE_TO_USER_REQ,
12145                                             NULL, SCTP_SO_LOCKED);
12146                                         /*
12147                                          * now relock the stcb so everything
12148                                          * is sane
12149                                          */
12150                                         hold_tcblock = 0;
12151                                         stcb = NULL;
12152                                         goto out;
12153                                 }
12154                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12155                                     asoc->primary_destination);
12156                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
12157                         }
12158                 }
12159         }
12160 skip_out_eof:
12161         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
12162                 some_on_control = 1;
12163         }
12164         if ((net->flight_size > net->cwnd) &&
12165             (sctp_cmt_on_off == 0)) {
12166                 queue_only = 1;
12167         } else if (asoc->ifp_had_enobuf) {
12168                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12169                 if (net->flight_size > (net->mtu * 2)) {
12170                         queue_only = 1;
12171                 } else {
12172                         queue_only = 0;
12173                 }
12174                 asoc->ifp_had_enobuf = 0;
12175                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12176                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12177                     sizeof(struct sctp_data_chunk)));
12178         } else {
12179                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12180                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12181                     sizeof(struct sctp_data_chunk)));
12182                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12183                         queue_only = 1;
12184                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12185                 } else if (net->flight_size > net->cwnd) {
12186                         queue_only = 1;
12187                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12188                 } else {
12189                         queue_only = 0;
12190                 }
12191         }
12192         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12193             (stcb->asoc.total_flight > 0) &&
12194             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12195             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12196             ) {
12197                 /*-
12198                  * Ok, Nagle is set on and we have data outstanding.
12199                  * Don't send anything and let SACKs drive out the
12200                  * data unless wen have a "full" segment to send.
12201                  */
12202                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12203                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12204                 }
12205                 SCTP_STAT_INCR(sctps_naglequeued);
12206                 nagle_applies = 1;
12207         } else {
12208                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12209                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12210                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12211                 }
12212                 SCTP_STAT_INCR(sctps_naglesent);
12213                 nagle_applies = 0;
12214         }
12215         if (queue_only_for_init) {
12216                 if (hold_tcblock == 0) {
12217                         SCTP_TCB_LOCK(stcb);
12218                         hold_tcblock = 1;
12219                 }
12220                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12221                         /* a collision took us forward? */
12222                         queue_only_for_init = 0;
12223                         queue_only = 0;
12224                 } else {
12225                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12226                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
12227                         queue_only_for_init = 0;
12228                         queue_only = 1;
12229                 }
12230         }
12231         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
12232                 /* we can attempt to send too. */
12233                 if (hold_tcblock == 0) {
12234                         /*
12235                          * If there is activity recv'ing sacks no need to
12236                          * send
12237                          */
12238                         if (SCTP_TCB_TRYLOCK(stcb)) {
12239                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12240                                 hold_tcblock = 1;
12241                         }
12242                 } else {
12243                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12244                 }
12245         } else if ((queue_only == 0) &&
12246                     (stcb->asoc.peers_rwnd == 0) &&
12247             (stcb->asoc.total_flight == 0)) {
12248                 /* We get to have a probe outstanding */
12249                 if (hold_tcblock == 0) {
12250                         hold_tcblock = 1;
12251                         SCTP_TCB_LOCK(stcb);
12252                 }
12253                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12254         } else if (some_on_control) {
12255                 int num_out, reason, cwnd_full, frag_point;
12256
12257                 /* Here we do control only */
12258                 if (hold_tcblock == 0) {
12259                         hold_tcblock = 1;
12260                         SCTP_TCB_LOCK(stcb);
12261                 }
12262                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
12263                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
12264                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
12265         }
12266         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d",
12267             queue_only, stcb->asoc.peers_rwnd, un_sent,
12268             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
12269             stcb->asoc.total_output_queue_size, error);
12270
12271 out:
12272 out_unlocked:
12273
12274         if (local_soresv && stcb) {
12275                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
12276                 local_soresv = 0;
12277         }
12278         if (create_lock_applied) {
12279                 SCTP_ASOC_CREATE_UNLOCK(inp);
12280                 create_lock_applied = 0;
12281         }
12282         if ((stcb) && hold_tcblock) {
12283                 SCTP_TCB_UNLOCK(stcb);
12284         }
12285         if (stcb && free_cnt_applied) {
12286                 atomic_add_int(&stcb->asoc.refcnt, -1);
12287         }
12288 #ifdef INVARIANTS
12289         if (stcb) {
12290                 if (mtx_owned(&stcb->tcb_mtx)) {
12291                         panic("Leaving with tcb mtx owned?");
12292                 }
12293                 if (mtx_owned(&stcb->tcb_send_mtx)) {
12294                         panic("Leaving with tcb send mtx owned?");
12295                 }
12296         }
12297 #endif
12298         if (top) {
12299                 sctp_m_freem(top);
12300         }
12301         if (control) {
12302                 sctp_m_freem(control);
12303         }
12304         return (error);
12305 }
12306
12307
12308 /*
12309  * generate an AUTHentication chunk, if required
12310  */
12311 struct mbuf *
12312 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
12313     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
12314     struct sctp_tcb *stcb, uint8_t chunk)
12315 {
12316         struct mbuf *m_auth;
12317         struct sctp_auth_chunk *auth;
12318         int chunk_len;
12319
12320         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
12321             (stcb == NULL))
12322                 return (m);
12323
12324         /* sysctl disabled auth? */
12325         if (sctp_auth_disable)
12326                 return (m);
12327
12328         /* peer doesn't do auth... */
12329         if (!stcb->asoc.peer_supports_auth) {
12330                 return (m);
12331         }
12332         /* does the requested chunk require auth? */
12333         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
12334                 return (m);
12335         }
12336         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
12337         if (m_auth == NULL) {
12338                 /* no mbuf's */
12339                 return (m);
12340         }
12341         /* reserve some space if this will be the first mbuf */
12342         if (m == NULL)
12343                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
12344         /* fill in the AUTH chunk details */
12345         auth = mtod(m_auth, struct sctp_auth_chunk *);
12346         bzero(auth, sizeof(*auth));
12347         auth->ch.chunk_type = SCTP_AUTHENTICATION;
12348         auth->ch.chunk_flags = 0;
12349         chunk_len = sizeof(*auth) +
12350             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
12351         auth->ch.chunk_length = htons(chunk_len);
12352         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
12353         /* key id and hmac digest will be computed and filled in upon send */
12354
12355         /* save the offset where the auth was inserted into the chain */
12356         if (m != NULL) {
12357                 struct mbuf *cn;
12358
12359                 *offset = 0;
12360                 cn = m;
12361                 while (cn) {
12362                         *offset += SCTP_BUF_LEN(cn);
12363                         cn = SCTP_BUF_NEXT(cn);
12364                 }
12365         } else
12366                 *offset = 0;
12367
12368         /* update length and return pointer to the auth chunk */
12369         SCTP_BUF_LEN(m_auth) = chunk_len;
12370         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
12371         if (auth_ret != NULL)
12372                 *auth_ret = auth;
12373
12374         return (m);
12375 }
12376
12377 int
12378 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
12379 {
12380         struct nd_prefix *pfx = NULL;
12381         struct nd_pfxrouter *pfxrtr = NULL;
12382         struct sockaddr_in6 gw6;
12383
12384         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
12385                 return (0);
12386
12387         /* get prefix entry of address */
12388         LIST_FOREACH(pfx, &nd_prefix, ndpr_entry) {
12389                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
12390                         continue;
12391                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
12392                     &src6->sin6_addr, &pfx->ndpr_mask))
12393                         break;
12394         }
12395         /* no prefix entry in the prefix list */
12396         if (pfx == NULL) {
12397                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
12398                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
12399                 return (0);
12400         }
12401         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
12402         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
12403
12404         /* search installed gateway from prefix entry */
12405         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
12406             pfxrtr->pfr_next) {
12407                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
12408                 gw6.sin6_family = AF_INET6;
12409                 gw6.sin6_len = sizeof(struct sockaddr_in6);
12410                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
12411                     sizeof(struct in6_addr));
12412                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
12413                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
12414                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
12415                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
12416                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
12417                     ro->ro_rt->rt_gateway)) {
12418                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
12419                         return (1);
12420                 }
12421         }
12422         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
12423         return (0);
12424 }
12425 int
12426 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
12427 {
12428         struct sockaddr_in *sin, *mask;
12429         struct ifaddr *ifa;
12430         struct in_addr srcnetaddr, gwnetaddr;
12431
12432         if (ro == NULL || ro->ro_rt == NULL ||
12433             sifa->address.sa.sa_family != AF_INET) {
12434                 return (0);
12435         }
12436         ifa = (struct ifaddr *)sifa->ifa;
12437         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
12438         sin = (struct sockaddr_in *)&sifa->address.sin;
12439         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
12440         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
12441         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
12442         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
12443
12444         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
12445         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
12446         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
12447         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
12448         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
12449         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
12450                 return (1);
12451         }
12452         return (0);
12453 }