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         switch (ifa->address.sa.sa_family) {
1878         case AF_INET:
1879                 if (ipv4_addr_legal) {
1880                         struct sockaddr_in *sin;
1881
1882                         sin = (struct sockaddr_in *)&ifa->address.sin;
1883                         if (sin->sin_addr.s_addr == 0) {
1884                                 /* not in scope , unspecified */
1885                                 return (0);
1886                         }
1887                         if ((ipv4_local_scope == 0) &&
1888                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1889                                 /* private address not in scope */
1890                                 return (0);
1891                         }
1892                 } else {
1893                         return (0);
1894                 }
1895                 break;
1896 #ifdef INET6
1897         case AF_INET6:
1898                 if (ipv6_addr_legal) {
1899                         struct sockaddr_in6 *sin6;
1900
1901                         /*
1902                          * Must update the flags,  bummer, which means any
1903                          * IFA locks must now be applied HERE <->
1904                          */
1905                         if (do_update) {
1906                                 sctp_gather_internal_ifa_flags(ifa);
1907                         }
1908                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1909                                 return (0);
1910                         }
1911                         /* ok to use deprecated addresses? */
1912                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1913                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1914                                 /* skip unspecifed addresses */
1915                                 return (0);
1916                         }
1917                         if (    /* (local_scope == 0) && */
1918                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1919                                 return (0);
1920                         }
1921                         if ((site_scope == 0) &&
1922                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1923                                 return (0);
1924                         }
1925                 } else {
1926                         return (0);
1927                 }
1928                 break;
1929 #endif
1930         default:
1931                 return (0);
1932         }
1933         return (1);
1934 }
1935
1936 static struct mbuf *
1937 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1938 {
1939         struct sctp_paramhdr *parmh;
1940         struct mbuf *mret;
1941         int len;
1942
1943         if (ifa->address.sa.sa_family == AF_INET) {
1944                 len = sizeof(struct sctp_ipv4addr_param);
1945         } else if (ifa->address.sa.sa_family == AF_INET6) {
1946                 len = sizeof(struct sctp_ipv6addr_param);
1947         } else {
1948                 /* unknown type */
1949                 return (m);
1950         }
1951         if (M_TRAILINGSPACE(m) >= len) {
1952                 /* easy side we just drop it on the end */
1953                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1954                 mret = m;
1955         } else {
1956                 /* Need more space */
1957                 mret = m;
1958                 while (SCTP_BUF_NEXT(mret) != NULL) {
1959                         mret = SCTP_BUF_NEXT(mret);
1960                 }
1961                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1962                 if (SCTP_BUF_NEXT(mret) == NULL) {
1963                         /* We are hosed, can't add more addresses */
1964                         return (m);
1965                 }
1966                 mret = SCTP_BUF_NEXT(mret);
1967                 parmh = mtod(mret, struct sctp_paramhdr *);
1968         }
1969         /* now add the parameter */
1970         switch (ifa->address.sa.sa_family) {
1971         case AF_INET:
1972                 {
1973                         struct sctp_ipv4addr_param *ipv4p;
1974                         struct sockaddr_in *sin;
1975
1976                         sin = (struct sockaddr_in *)&ifa->address.sin;
1977                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1978                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1979                         parmh->param_length = htons(len);
1980                         ipv4p->addr = sin->sin_addr.s_addr;
1981                         SCTP_BUF_LEN(mret) += len;
1982                         break;
1983                 }
1984 #ifdef INET6
1985         case AF_INET6:
1986                 {
1987                         struct sctp_ipv6addr_param *ipv6p;
1988                         struct sockaddr_in6 *sin6;
1989
1990                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1991                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
1992                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
1993                         parmh->param_length = htons(len);
1994                         memcpy(ipv6p->addr, &sin6->sin6_addr,
1995                             sizeof(ipv6p->addr));
1996                         /* clear embedded scope in the address */
1997                         in6_clearscope((struct in6_addr *)ipv6p->addr);
1998                         SCTP_BUF_LEN(mret) += len;
1999                         break;
2000                 }
2001 #endif
2002         default:
2003                 return (m);
2004         }
2005         return (mret);
2006 }
2007
2008
2009 struct mbuf *
2010 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
2011     struct mbuf *m_at, int cnt_inits_to)
2012 {
2013         struct sctp_vrf *vrf = NULL;
2014         int cnt, limit_out = 0, total_count;
2015         uint32_t vrf_id;
2016
2017         vrf_id = inp->def_vrf_id;
2018         SCTP_IPI_ADDR_RLOCK();
2019         vrf = sctp_find_vrf(vrf_id);
2020         if (vrf == NULL) {
2021                 SCTP_IPI_ADDR_RUNLOCK();
2022                 return (m_at);
2023         }
2024         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2025                 struct sctp_ifa *sctp_ifap;
2026                 struct sctp_ifn *sctp_ifnp;
2027
2028                 cnt = cnt_inits_to;
2029                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2030                         limit_out = 1;
2031                         cnt = SCTP_ADDRESS_LIMIT;
2032                         goto skip_count;
2033                 }
2034                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2035                         if ((scope->loopback_scope == 0) &&
2036                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2037                                 /*
2038                                  * Skip loopback devices if loopback_scope
2039                                  * not set
2040                                  */
2041                                 continue;
2042                         }
2043                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2044                                 if (sctp_is_address_in_scope(sctp_ifap,
2045                                     scope->ipv4_addr_legal,
2046                                     scope->ipv6_addr_legal,
2047                                     scope->loopback_scope,
2048                                     scope->ipv4_local_scope,
2049                                     scope->local_scope,
2050                                     scope->site_scope, 1) == 0) {
2051                                         continue;
2052                                 }
2053                                 cnt++;
2054                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2055                                         break;
2056                                 }
2057                         }
2058                         if (cnt > SCTP_ADDRESS_LIMIT) {
2059                                 break;
2060                         }
2061                 }
2062 skip_count:
2063                 if (cnt > 1) {
2064                         total_count = 0;
2065                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2066                                 cnt = 0;
2067                                 if ((scope->loopback_scope == 0) &&
2068                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2069                                         /*
2070                                          * Skip loopback devices if
2071                                          * loopback_scope not set
2072                                          */
2073                                         continue;
2074                                 }
2075                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2076                                         if (sctp_is_address_in_scope(sctp_ifap,
2077                                             scope->ipv4_addr_legal,
2078                                             scope->ipv6_addr_legal,
2079                                             scope->loopback_scope,
2080                                             scope->ipv4_local_scope,
2081                                             scope->local_scope,
2082                                             scope->site_scope, 0) == 0) {
2083                                                 continue;
2084                                         }
2085                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2086                                         if (limit_out) {
2087                                                 cnt++;
2088                                                 total_count++;
2089                                                 if (cnt >= 2) {
2090                                                         /*
2091                                                          * two from each
2092                                                          * address
2093                                                          */
2094                                                         break;
2095                                                 }
2096                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2097                                                         /* No more addresses */
2098                                                         break;
2099                                                 }
2100                                         }
2101                                 }
2102                         }
2103                 }
2104         } else {
2105                 struct sctp_laddr *laddr;
2106
2107                 cnt = cnt_inits_to;
2108                 /* First, how many ? */
2109                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2110                         if (laddr->ifa == NULL) {
2111                                 continue;
2112                         }
2113                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2114                                 /*
2115                                  * Address being deleted by the system, dont
2116                                  * list.
2117                                  */
2118                                 continue;
2119                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2120                                 /*
2121                                  * Address being deleted on this ep don't
2122                                  * list.
2123                                  */
2124                                 continue;
2125                         }
2126                         if (sctp_is_address_in_scope(laddr->ifa,
2127                             scope->ipv4_addr_legal,
2128                             scope->ipv6_addr_legal,
2129                             scope->loopback_scope,
2130                             scope->ipv4_local_scope,
2131                             scope->local_scope,
2132                             scope->site_scope, 1) == 0) {
2133                                 continue;
2134                         }
2135                         cnt++;
2136                 }
2137                 if (cnt > SCTP_ADDRESS_LIMIT) {
2138                         limit_out = 1;
2139                 }
2140                 /*
2141                  * To get through a NAT we only list addresses if we have
2142                  * more than one. That way if you just bind a single address
2143                  * we let the source of the init dictate our address.
2144                  */
2145                 if (cnt > 1) {
2146                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2147                                 cnt = 0;
2148                                 if (laddr->ifa == NULL) {
2149                                         continue;
2150                                 }
2151                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2152                                         continue;
2153
2154                                 if (sctp_is_address_in_scope(laddr->ifa,
2155                                     scope->ipv4_addr_legal,
2156                                     scope->ipv6_addr_legal,
2157                                     scope->loopback_scope,
2158                                     scope->ipv4_local_scope,
2159                                     scope->local_scope,
2160                                     scope->site_scope, 0) == 0) {
2161                                         continue;
2162                                 }
2163                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2164                                 cnt++;
2165                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2166                                         break;
2167                                 }
2168                         }
2169                 }
2170         }
2171         SCTP_IPI_ADDR_RUNLOCK();
2172         return (m_at);
2173 }
2174
2175 static struct sctp_ifa *
2176 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2177     uint8_t dest_is_loop,
2178     uint8_t dest_is_priv,
2179     sa_family_t fam)
2180 {
2181         uint8_t dest_is_global = 0;
2182
2183         /* dest_is_priv is true if destination is a private address */
2184         /* dest_is_loop is true if destination is a loopback addresses */
2185
2186         /*
2187          * Here we determine if its a preferred address. A preferred address
2188          * means it is the same scope or higher scope then the destination.
2189          * L = loopback, P = private, G = global
2190          * ----------------------------------------- src    |  dest | result
2191          * ---------------------------------------- L     |    L  |    yes
2192          * ----------------------------------------- P     |    L  |
2193          * yes-v4 no-v6 ----------------------------------------- G     |
2194          * L  |    yes-v4 no-v6 ----------------------------------------- L
2195          * |    P  |    no ----------------------------------------- P     |
2196          * P  |    yes ----------------------------------------- G     |
2197          * P  |    no ----------------------------------------- L     |    G
2198          * |    no ----------------------------------------- P     |    G  |
2199          * no ----------------------------------------- G     |    G  |
2200          * yes -----------------------------------------
2201          */
2202
2203         if (ifa->address.sa.sa_family != fam) {
2204                 /* forget mis-matched family */
2205                 return (NULL);
2206         }
2207         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2208                 dest_is_global = 1;
2209         }
2210         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2211         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2212         /* Ok the address may be ok */
2213         if (fam == AF_INET6) {
2214                 /* ok to use deprecated addresses? */
2215                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2216                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2217                         return (NULL);
2218                 }
2219                 if (ifa->src_is_priv) {
2220                         if (dest_is_loop) {
2221                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2222                                 return (NULL);
2223                         }
2224                 }
2225                 if (ifa->src_is_glob) {
2226                         if (dest_is_loop) {
2227                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2228                                 return (NULL);
2229                         }
2230                 }
2231         }
2232         /*
2233          * Now that we know what is what, implement or table this could in
2234          * theory be done slicker (it used to be), but this is
2235          * straightforward and easier to validate :-)
2236          */
2237         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2238             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2239         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2240             dest_is_loop, dest_is_priv, dest_is_global);
2241
2242         if ((ifa->src_is_loop) && (dest_is_priv)) {
2243                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2244                 return (NULL);
2245         }
2246         if ((ifa->src_is_glob) && (dest_is_priv)) {
2247                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2248                 return (NULL);
2249         }
2250         if ((ifa->src_is_loop) && (dest_is_global)) {
2251                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2252                 return (NULL);
2253         }
2254         if ((ifa->src_is_priv) && (dest_is_global)) {
2255                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2256                 return (NULL);
2257         }
2258         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2259         /* its a preferred address */
2260         return (ifa);
2261 }
2262
2263 static struct sctp_ifa *
2264 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2265     uint8_t dest_is_loop,
2266     uint8_t dest_is_priv,
2267     sa_family_t fam)
2268 {
2269         uint8_t dest_is_global = 0;
2270
2271
2272         /*
2273          * Here we determine if its a acceptable address. A acceptable
2274          * address means it is the same scope or higher scope but we can
2275          * allow for NAT which means its ok to have a global dest and a
2276          * private src.
2277          *
2278          * L = loopback, P = private, G = global
2279          * ----------------------------------------- src    |  dest | result
2280          * ----------------------------------------- L     |   L   |    yes
2281          * ----------------------------------------- P     |   L   |
2282          * yes-v4 no-v6 ----------------------------------------- G     |
2283          * L   |    yes ----------------------------------------- L     |
2284          * P   |    no ----------------------------------------- P     |   P
2285          * |    yes ----------------------------------------- G     |   P
2286          * |    yes - May not work -----------------------------------------
2287          * L     |   G   |    no ----------------------------------------- P
2288          * |   G   |    yes - May not work
2289          * ----------------------------------------- G     |   G   |    yes
2290          * -----------------------------------------
2291          */
2292
2293         if (ifa->address.sa.sa_family != fam) {
2294                 /* forget non matching family */
2295                 return (NULL);
2296         }
2297         /* Ok the address may be ok */
2298         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2299                 dest_is_global = 1;
2300         }
2301         if (fam == AF_INET6) {
2302                 /* ok to use deprecated addresses? */
2303                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2304                         return (NULL);
2305                 }
2306                 if (ifa->src_is_priv) {
2307                         /* Special case, linklocal to loop */
2308                         if (dest_is_loop)
2309                                 return (NULL);
2310                 }
2311         }
2312         /*
2313          * Now that we know what is what, implement our table. This could in
2314          * theory be done slicker (it used to be), but this is
2315          * straightforward and easier to validate :-)
2316          */
2317         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2318                 return (NULL);
2319         }
2320         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2321                 return (NULL);
2322         }
2323         /* its an acceptable address */
2324         return (ifa);
2325 }
2326
2327 int
2328 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2329 {
2330         struct sctp_laddr *laddr;
2331
2332         if (stcb == NULL) {
2333                 /* There are no restrictions, no TCB :-) */
2334                 return (0);
2335         }
2336         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, 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) {
2343                         /* Yes it is on the list */
2344                         return (1);
2345                 }
2346         }
2347         return (0);
2348 }
2349
2350
2351 int
2352 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2353 {
2354         struct sctp_laddr *laddr;
2355
2356         if (ifa == NULL)
2357                 return (0);
2358         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2359                 if (laddr->ifa == NULL) {
2360                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2361                             __FUNCTION__);
2362                         continue;
2363                 }
2364                 if ((laddr->ifa == ifa) && laddr->action == 0)
2365                         /* same pointer */
2366                         return (1);
2367         }
2368         return (0);
2369 }
2370
2371
2372
2373 static struct sctp_ifa *
2374 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2375     sctp_route_t * ro,
2376     uint32_t vrf_id,
2377     int non_asoc_addr_ok,
2378     uint8_t dest_is_priv,
2379     uint8_t dest_is_loop,
2380     sa_family_t fam)
2381 {
2382         struct sctp_laddr *laddr, *starting_point;
2383         void *ifn;
2384         int resettotop = 0;
2385         struct sctp_ifn *sctp_ifn;
2386         struct sctp_ifa *sctp_ifa, *sifa;
2387         struct sctp_vrf *vrf;
2388         uint32_t ifn_index;
2389
2390         vrf = sctp_find_vrf(vrf_id);
2391         if (vrf == NULL)
2392                 return (NULL);
2393
2394         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2395         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2396         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2397         /*
2398          * first question, is the ifn we will emit on in our list, if so, we
2399          * want such an address. Note that we first looked for a preferred
2400          * address.
2401          */
2402         if (sctp_ifn) {
2403                 /* is a preferred one on the interface we route out? */
2404                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2405                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2406                             (non_asoc_addr_ok == 0))
2407                                 continue;
2408                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2409                             dest_is_loop,
2410                             dest_is_priv, fam);
2411                         if (sifa == NULL)
2412                                 continue;
2413                         if (sctp_is_addr_in_ep(inp, sifa)) {
2414                                 atomic_add_int(&sifa->refcount, 1);
2415                                 return (sifa);
2416                         }
2417                 }
2418         }
2419         /*
2420          * ok, now we now need to find one on the list of the addresses. We
2421          * can't get one on the emitting interface so let's find first a
2422          * preferred one. If not that an acceptable one otherwise... we
2423          * return NULL.
2424          */
2425         starting_point = inp->next_addr_touse;
2426 once_again:
2427         if (inp->next_addr_touse == NULL) {
2428                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2429                 resettotop = 1;
2430         }
2431         for (laddr = inp->next_addr_touse; laddr;
2432             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2433                 if (laddr->ifa == NULL) {
2434                         /* address has been removed */
2435                         continue;
2436                 }
2437                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2438                         /* address is being deleted */
2439                         continue;
2440                 }
2441                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2442                     dest_is_priv, fam);
2443                 if (sifa == NULL)
2444                         continue;
2445                 atomic_add_int(&sifa->refcount, 1);
2446                 return (sifa);
2447         }
2448         if (resettotop == 0) {
2449                 inp->next_addr_touse = NULL;
2450                 goto once_again;
2451         }
2452         inp->next_addr_touse = starting_point;
2453         resettotop = 0;
2454 once_again_too:
2455         if (inp->next_addr_touse == NULL) {
2456                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2457                 resettotop = 1;
2458         }
2459         /* ok, what about an acceptable address in the inp */
2460         for (laddr = inp->next_addr_touse; laddr;
2461             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2462                 if (laddr->ifa == NULL) {
2463                         /* address has been removed */
2464                         continue;
2465                 }
2466                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2467                         /* address is being deleted */
2468                         continue;
2469                 }
2470                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2471                     dest_is_priv, fam);
2472                 if (sifa == NULL)
2473                         continue;
2474                 atomic_add_int(&sifa->refcount, 1);
2475                 return (sifa);
2476         }
2477         if (resettotop == 0) {
2478                 inp->next_addr_touse = NULL;
2479                 goto once_again_too;
2480         }
2481         /*
2482          * no address bound can be a source for the destination we are in
2483          * trouble
2484          */
2485         return (NULL);
2486 }
2487
2488
2489
2490 static struct sctp_ifa *
2491 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2492     struct sctp_tcb *stcb,
2493     struct sctp_nets *net,
2494     sctp_route_t * ro,
2495     uint32_t vrf_id,
2496     uint8_t dest_is_priv,
2497     uint8_t dest_is_loop,
2498     int non_asoc_addr_ok,
2499     sa_family_t fam)
2500 {
2501         struct sctp_laddr *laddr, *starting_point;
2502         void *ifn;
2503         struct sctp_ifn *sctp_ifn;
2504         struct sctp_ifa *sctp_ifa, *sifa;
2505         uint8_t start_at_beginning = 0;
2506         struct sctp_vrf *vrf;
2507         uint32_t ifn_index;
2508
2509         /*
2510          * first question, is the ifn we will emit on in our list, if so, we
2511          * want that one.
2512          */
2513         vrf = sctp_find_vrf(vrf_id);
2514         if (vrf == NULL)
2515                 return (NULL);
2516
2517         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2518         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2519         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2520
2521         /*
2522          * first question, is the ifn we will emit on in our list?  If so,
2523          * we want that one. First we look for a preferred. Second, we go
2524          * for an acceptable.
2525          */
2526         if (sctp_ifn) {
2527                 /* first try for a preferred address on the ep */
2528                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2529                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2530                                 continue;
2531                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2532                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2533                                 if (sifa == NULL)
2534                                         continue;
2535                                 if ((non_asoc_addr_ok == 0) &&
2536                                     (sctp_is_addr_restricted(stcb, sifa))) {
2537                                         /* on the no-no list */
2538                                         continue;
2539                                 }
2540                                 atomic_add_int(&sifa->refcount, 1);
2541                                 return (sifa);
2542                         }
2543                 }
2544                 /* next try for an acceptable address on the ep */
2545                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2546                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2547                                 continue;
2548                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2549                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2550                                 if (sifa == NULL)
2551                                         continue;
2552                                 if ((non_asoc_addr_ok == 0) &&
2553                                     (sctp_is_addr_restricted(stcb, sifa))) {
2554                                         /* on the no-no list */
2555                                         continue;
2556                                 }
2557                                 atomic_add_int(&sifa->refcount, 1);
2558                                 return (sifa);
2559                         }
2560                 }
2561
2562         }
2563         /*
2564          * if we can't find one like that then we must look at all addresses
2565          * bound to pick one at first preferable then secondly acceptable.
2566          */
2567         starting_point = stcb->asoc.last_used_address;
2568 sctp_from_the_top:
2569         if (stcb->asoc.last_used_address == NULL) {
2570                 start_at_beginning = 1;
2571                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2572         }
2573         /* search beginning with the last used address */
2574         for (laddr = stcb->asoc.last_used_address; laddr;
2575             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2576                 if (laddr->ifa == NULL) {
2577                         /* address has been removed */
2578                         continue;
2579                 }
2580                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2581                         /* address is being deleted */
2582                         continue;
2583                 }
2584                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2585                 if (sifa == NULL)
2586                         continue;
2587                 if ((non_asoc_addr_ok == 0) &&
2588                     (sctp_is_addr_restricted(stcb, sifa))) {
2589                         /* on the no-no list */
2590                         continue;
2591                 }
2592                 stcb->asoc.last_used_address = laddr;
2593                 atomic_add_int(&sifa->refcount, 1);
2594                 return (sifa);
2595         }
2596         if (start_at_beginning == 0) {
2597                 stcb->asoc.last_used_address = NULL;
2598                 goto sctp_from_the_top;
2599         }
2600         /* now try for any higher scope than the destination */
2601         stcb->asoc.last_used_address = starting_point;
2602         start_at_beginning = 0;
2603 sctp_from_the_top2:
2604         if (stcb->asoc.last_used_address == NULL) {
2605                 start_at_beginning = 1;
2606                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2607         }
2608         /* search beginning with the last used address */
2609         for (laddr = stcb->asoc.last_used_address; laddr;
2610             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2611                 if (laddr->ifa == NULL) {
2612                         /* address has been removed */
2613                         continue;
2614                 }
2615                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2616                         /* address is being deleted */
2617                         continue;
2618                 }
2619                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2620                     dest_is_priv, fam);
2621                 if (sifa == NULL)
2622                         continue;
2623                 if ((non_asoc_addr_ok == 0) &&
2624                     (sctp_is_addr_restricted(stcb, sifa))) {
2625                         /* on the no-no list */
2626                         continue;
2627                 }
2628                 stcb->asoc.last_used_address = laddr;
2629                 atomic_add_int(&sifa->refcount, 1);
2630                 return (sifa);
2631         }
2632         if (start_at_beginning == 0) {
2633                 stcb->asoc.last_used_address = NULL;
2634                 goto sctp_from_the_top2;
2635         }
2636         return (NULL);
2637 }
2638
2639 static struct sctp_ifa *
2640 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2641     struct sctp_tcb *stcb,
2642     int non_asoc_addr_ok,
2643     uint8_t dest_is_loop,
2644     uint8_t dest_is_priv,
2645     int addr_wanted,
2646     sa_family_t fam,
2647     sctp_route_t * ro
2648 )
2649 {
2650         struct sctp_ifa *ifa, *sifa;
2651         int num_eligible_addr = 0;
2652
2653         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2654                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2655                     (non_asoc_addr_ok == 0))
2656                         continue;
2657                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2658                     dest_is_priv, fam);
2659                 if (sifa == NULL)
2660                         continue;
2661                 /*
2662                  * Check if the IPv6 address matches to next-hop. In the
2663                  * mobile case, old IPv6 address may be not deleted from the
2664                  * interface. Then, the interface has previous and new
2665                  * addresses.  We should use one corresponding to the
2666                  * next-hop.  (by micchie)
2667                  */
2668 #ifdef INET6
2669                 if (stcb && fam == AF_INET6 &&
2670                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2671                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2672                             == 0) {
2673                                 continue;
2674                         }
2675                 }
2676 #endif
2677                 /* Avoid topologically incorrect IPv4 address */
2678                 if (stcb && fam == AF_INET &&
2679                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2680                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2681                                 continue;
2682                         }
2683                 }
2684                 if (stcb) {
2685                         if ((non_asoc_addr_ok == 0) &&
2686                             sctp_is_addr_restricted(stcb, sifa)) {
2687                                 /*
2688                                  * It is restricted for some reason..
2689                                  * probably not yet added.
2690                                  */
2691                                 continue;
2692                         }
2693                 }
2694                 if (num_eligible_addr >= addr_wanted) {
2695                         return (sifa);
2696                 }
2697                 num_eligible_addr++;
2698         }
2699         return (NULL);
2700 }
2701
2702
2703 static int
2704 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2705     struct sctp_tcb *stcb,
2706     int non_asoc_addr_ok,
2707     uint8_t dest_is_loop,
2708     uint8_t dest_is_priv,
2709     sa_family_t fam)
2710 {
2711         struct sctp_ifa *ifa, *sifa;
2712         int num_eligible_addr = 0;
2713
2714         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2715                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2716                     (non_asoc_addr_ok == 0)) {
2717                         continue;
2718                 }
2719                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2720                     dest_is_priv, fam);
2721                 if (sifa == NULL) {
2722                         continue;
2723                 }
2724                 if (stcb) {
2725                         if ((non_asoc_addr_ok == 0) &&
2726                             sctp_is_addr_restricted(stcb, sifa)) {
2727                                 /*
2728                                  * It is restricted for some reason..
2729                                  * probably not yet added.
2730                                  */
2731                                 continue;
2732                         }
2733                 }
2734                 num_eligible_addr++;
2735         }
2736         return (num_eligible_addr);
2737 }
2738
2739 static struct sctp_ifa *
2740 sctp_choose_boundall(struct sctp_inpcb *inp,
2741     struct sctp_tcb *stcb,
2742     struct sctp_nets *net,
2743     sctp_route_t * ro,
2744     uint32_t vrf_id,
2745     uint8_t dest_is_priv,
2746     uint8_t dest_is_loop,
2747     int non_asoc_addr_ok,
2748     sa_family_t fam)
2749 {
2750         int cur_addr_num = 0, num_preferred = 0;
2751         void *ifn;
2752         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2753         struct sctp_ifa *sctp_ifa, *sifa;
2754         uint32_t ifn_index;
2755         struct sctp_vrf *vrf;
2756
2757         /*-
2758          * For boundall we can use any address in the association.
2759          * If non_asoc_addr_ok is set we can use any address (at least in
2760          * theory). So we look for preferred addresses first. If we find one,
2761          * we use it. Otherwise we next try to get an address on the
2762          * interface, which we should be able to do (unless non_asoc_addr_ok
2763          * is false and we are routed out that way). In these cases where we
2764          * can't use the address of the interface we go through all the
2765          * ifn's looking for an address we can use and fill that in. Punting
2766          * means we send back address 0, which will probably cause problems
2767          * actually since then IP will fill in the address of the route ifn,
2768          * which means we probably already rejected it.. i.e. here comes an
2769          * abort :-<.
2770          */
2771         vrf = sctp_find_vrf(vrf_id);
2772         if (vrf == NULL)
2773                 return (NULL);
2774
2775         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2776         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2777         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2778         if (sctp_ifn == NULL) {
2779                 /* ?? We don't have this guy ?? */
2780                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2781                 goto bound_all_plan_b;
2782         }
2783         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2784             ifn_index, sctp_ifn->ifn_name);
2785
2786         if (net) {
2787                 cur_addr_num = net->indx_of_eligible_next_to_use;
2788         }
2789         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2790             stcb,
2791             non_asoc_addr_ok,
2792             dest_is_loop,
2793             dest_is_priv, fam);
2794         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2795             num_preferred, sctp_ifn->ifn_name);
2796         if (num_preferred == 0) {
2797                 /*
2798                  * no eligible addresses, we must use some other interface
2799                  * address if we can find one.
2800                  */
2801                 goto bound_all_plan_b;
2802         }
2803         /*
2804          * Ok we have num_eligible_addr set with how many we can use, this
2805          * may vary from call to call due to addresses being deprecated
2806          * etc..
2807          */
2808         if (cur_addr_num >= num_preferred) {
2809                 cur_addr_num = 0;
2810         }
2811         /*
2812          * select the nth address from the list (where cur_addr_num is the
2813          * nth) and 0 is the first one, 1 is the second one etc...
2814          */
2815         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2816
2817         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2818             dest_is_priv, cur_addr_num, fam, ro);
2819
2820         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2821         if (sctp_ifa) {
2822                 atomic_add_int(&sctp_ifa->refcount, 1);
2823                 if (net) {
2824                         /* save off where the next one we will want */
2825                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2826                 }
2827                 return (sctp_ifa);
2828         }
2829         /*
2830          * plan_b: Look at all interfaces and find a preferred address. If
2831          * no preferred fall through to plan_c.
2832          */
2833 bound_all_plan_b:
2834         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2835         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2836                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2837                     sctp_ifn->ifn_name);
2838                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2839                         /* wrong base scope */
2840                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2841                         continue;
2842                 }
2843                 if ((sctp_ifn == looked_at) && looked_at) {
2844                         /* already looked at this guy */
2845                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2846                         continue;
2847                 }
2848                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2849                     dest_is_loop, dest_is_priv, fam);
2850                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2851                     "Found ifn:%p %d preferred source addresses\n",
2852                     ifn, num_preferred);
2853                 if (num_preferred == 0) {
2854                         /* None on this interface. */
2855                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2856                         continue;
2857                 }
2858                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2859                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2860                     num_preferred, sctp_ifn, cur_addr_num);
2861
2862                 /*
2863                  * Ok we have num_eligible_addr set with how many we can
2864                  * use, this may vary from call to call due to addresses
2865                  * being deprecated etc..
2866                  */
2867                 if (cur_addr_num >= num_preferred) {
2868                         cur_addr_num = 0;
2869                 }
2870                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2871                     dest_is_priv, cur_addr_num, fam, ro);
2872                 if (sifa == NULL)
2873                         continue;
2874                 if (net) {
2875                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2876                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2877                             cur_addr_num);
2878                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2879                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2880                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2881                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2882                 }
2883                 atomic_add_int(&sifa->refcount, 1);
2884                 return (sifa);
2885
2886         }
2887
2888         /* plan_c: do we have an acceptable address on the emit interface */
2889         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
2890         if (emit_ifn == NULL) {
2891                 goto plan_d;
2892         }
2893         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
2894                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2895                     (non_asoc_addr_ok == 0))
2896                         continue;
2897                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
2898                     dest_is_priv, fam);
2899                 if (sifa == NULL)
2900                         continue;
2901                 if (stcb) {
2902                         if ((non_asoc_addr_ok == 0) &&
2903                             sctp_is_addr_restricted(stcb, sifa)) {
2904                                 /*
2905                                  * It is restricted for some reason..
2906                                  * probably not yet added.
2907                                  */
2908                                 continue;
2909                         }
2910                 }
2911                 atomic_add_int(&sifa->refcount, 1);
2912                 return (sifa);
2913         }
2914 plan_d:
2915         /*
2916          * plan_d: We are in trouble. No preferred address on the emit
2917          * interface. And not even a preferred address on all interfaces. Go
2918          * out and see if we can find an acceptable address somewhere
2919          * amongst all interfaces.
2920          */
2921         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
2922         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2923                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2924                         /* wrong base scope */
2925                         continue;
2926                 }
2927                 if ((sctp_ifn == looked_at) && looked_at)
2928                         /* already looked at this guy */
2929                         continue;
2930
2931                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2932                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2933                             (non_asoc_addr_ok == 0))
2934                                 continue;
2935                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
2936                             dest_is_loop,
2937                             dest_is_priv, fam);
2938                         if (sifa == NULL)
2939                                 continue;
2940                         if (stcb) {
2941                                 if ((non_asoc_addr_ok == 0) &&
2942                                     sctp_is_addr_restricted(stcb, sifa)) {
2943                                         /*
2944                                          * It is restricted for some
2945                                          * reason.. probably not yet added.
2946                                          */
2947                                         continue;
2948                                 }
2949                         }
2950                         atomic_add_int(&sifa->refcount, 1);
2951                         return (sifa);
2952                 }
2953         }
2954         /*
2955          * Ok we can find NO address to source from that is not on our
2956          * restricted list and non_asoc_address is NOT ok, or it is on our
2957          * restricted list. We can't source to it :-(
2958          */
2959         return (NULL);
2960 }
2961
2962
2963
2964 /* tcb may be NULL */
2965 struct sctp_ifa *
2966 sctp_source_address_selection(struct sctp_inpcb *inp,
2967     struct sctp_tcb *stcb,
2968     sctp_route_t * ro,
2969     struct sctp_nets *net,
2970     int non_asoc_addr_ok, uint32_t vrf_id)
2971 {
2972         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
2973
2974 #ifdef INET6
2975         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
2976
2977 #endif
2978         struct sctp_ifa *answer;
2979         uint8_t dest_is_priv, dest_is_loop;
2980         sa_family_t fam;
2981
2982         /*-
2983          * Rules: - Find the route if needed, cache if I can. - Look at
2984          * interface address in route, Is it in the bound list. If so we
2985          * have the best source. - If not we must rotate amongst the
2986          * addresses.
2987          *
2988          * Cavets and issues
2989          *
2990          * Do we need to pay attention to scope. We can have a private address
2991          * or a global address we are sourcing or sending to. So if we draw
2992          * it out
2993          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
2994          * For V4
2995          *------------------------------------------
2996          *      source     *      dest  *  result
2997          * -----------------------------------------
2998          * <a>  Private    *    Global  *  NAT
2999          * -----------------------------------------
3000          * <b>  Private    *    Private *  No problem
3001          * -----------------------------------------
3002          * <c>  Global     *    Private *  Huh, How will this work?
3003          * -----------------------------------------
3004          * <d>  Global     *    Global  *  No Problem
3005          *------------------------------------------
3006          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3007          * For V6
3008          *------------------------------------------
3009          *      source     *      dest  *  result
3010          * -----------------------------------------
3011          * <a>  Linklocal  *    Global  *
3012          * -----------------------------------------
3013          * <b>  Linklocal  * Linklocal  *  No problem
3014          * -----------------------------------------
3015          * <c>  Global     * Linklocal  *  Huh, How will this work?
3016          * -----------------------------------------
3017          * <d>  Global     *    Global  *  No Problem
3018          *------------------------------------------
3019          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3020          *
3021          * And then we add to that what happens if there are multiple addresses
3022          * assigned to an interface. Remember the ifa on a ifn is a linked
3023          * list of addresses. So one interface can have more than one IP
3024          * address. What happens if we have both a private and a global
3025          * address? Do we then use context of destination to sort out which
3026          * one is best? And what about NAT's sending P->G may get you a NAT
3027          * translation, or should you select the G thats on the interface in
3028          * preference.
3029          *
3030          * Decisions:
3031          *
3032          * - count the number of addresses on the interface.
3033          * - if it is one, no problem except case <c>.
3034          *   For <a> we will assume a NAT out there.
3035          * - if there are more than one, then we need to worry about scope P
3036          *   or G. We should prefer G -> G and P -> P if possible.
3037          *   Then as a secondary fall back to mixed types G->P being a last
3038          *   ditch one.
3039          * - The above all works for bound all, but bound specific we need to
3040          *   use the same concept but instead only consider the bound
3041          *   addresses. If the bound set is NOT assigned to the interface then
3042          *   we must use rotation amongst the bound addresses..
3043          */
3044         if (ro->ro_rt == NULL) {
3045                 /*
3046                  * Need a route to cache.
3047                  */
3048                 SCTP_RTALLOC(ro, vrf_id);
3049         }
3050         if (ro->ro_rt == NULL) {
3051                 return (NULL);
3052         }
3053         fam = to->sin_family;
3054         dest_is_priv = dest_is_loop = 0;
3055         /* Setup our scopes for the destination */
3056         switch (fam) {
3057         case AF_INET:
3058                 /* Scope based on outbound address */
3059                 if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3060                         dest_is_priv = 1;
3061                 } else if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3062                         dest_is_loop = 1;
3063                         if (net != NULL) {
3064                                 /* mark it as local */
3065                                 net->addr_is_local = 1;
3066                         }
3067                 }
3068                 break;
3069 #ifdef INET6
3070         case AF_INET6:
3071                 /* Scope based on outbound address */
3072                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
3073                         /*
3074                          * If the route goes to the loopback address OR the
3075                          * address is a loopback address, we are loopback
3076                          * scope. But we don't use dest_is_priv (link local
3077                          * addresses).
3078                          */
3079                         dest_is_loop = 1;
3080                         if (net != NULL) {
3081                                 /* mark it as local */
3082                                 net->addr_is_local = 1;
3083                         }
3084                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3085                         dest_is_priv = 1;
3086                 }
3087                 break;
3088 #endif
3089         }
3090         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3091         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
3092         SCTP_IPI_ADDR_RLOCK();
3093         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3094                 /*
3095                  * Bound all case
3096                  */
3097                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3098                     dest_is_priv, dest_is_loop,
3099                     non_asoc_addr_ok, fam);
3100                 SCTP_IPI_ADDR_RUNLOCK();
3101                 return (answer);
3102         }
3103         /*
3104          * Subset bound case
3105          */
3106         if (stcb) {
3107                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3108                     vrf_id, dest_is_priv,
3109                     dest_is_loop,
3110                     non_asoc_addr_ok, fam);
3111         } else {
3112                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3113                     non_asoc_addr_ok,
3114                     dest_is_priv,
3115                     dest_is_loop, fam);
3116         }
3117         SCTP_IPI_ADDR_RUNLOCK();
3118         return (answer);
3119 }
3120
3121 static int
3122 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
3123 {
3124         struct cmsghdr cmh;
3125         int tlen, at;
3126
3127         tlen = SCTP_BUF_LEN(control);
3128         at = 0;
3129         /*
3130          * Independent of how many mbufs, find the c_type inside the control
3131          * structure and copy out the data.
3132          */
3133         while (at < tlen) {
3134                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3135                         /* not enough room for one more we are done. */
3136                         return (0);
3137                 }
3138                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3139                 if (((int)cmh.cmsg_len + at) > tlen) {
3140                         /*
3141                          * this is real messed up since there is not enough
3142                          * data here to cover the cmsg header. We are done.
3143                          */
3144                         return (0);
3145                 }
3146                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3147                     (c_type == cmh.cmsg_type)) {
3148                         /* found the one we want, copy it out */
3149                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
3150                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3151                                 /*
3152                                  * space of cmsg_len after header not big
3153                                  * enough
3154                                  */
3155                                 return (0);
3156                         }
3157                         m_copydata(control, at, cpsize, data);
3158                         return (1);
3159                 } else {
3160                         at += CMSG_ALIGN(cmh.cmsg_len);
3161                         if (cmh.cmsg_len == 0) {
3162                                 break;
3163                         }
3164                 }
3165         }
3166         /* not found */
3167         return (0);
3168 }
3169
3170 static struct mbuf *
3171 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3172     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3173 {
3174         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3175         struct sctp_state_cookie *stc;
3176         struct sctp_paramhdr *ph;
3177         uint8_t *foo;
3178         int sig_offset;
3179         uint16_t cookie_sz;
3180
3181         mret = NULL;
3182         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3183             sizeof(struct sctp_paramhdr)), 0,
3184             M_DONTWAIT, 1, MT_DATA);
3185         if (mret == NULL) {
3186                 return (NULL);
3187         }
3188         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3189         if (copy_init == NULL) {
3190                 sctp_m_freem(mret);
3191                 return (NULL);
3192         }
3193 #ifdef SCTP_MBUF_LOGGING
3194         if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
3195                 struct mbuf *mat;
3196
3197                 mat = copy_init;
3198                 while (mat) {
3199                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3200                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3201                         }
3202                         mat = SCTP_BUF_NEXT(mat);
3203                 }
3204         }
3205 #endif
3206         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3207             M_DONTWAIT);
3208         if (copy_initack == NULL) {
3209                 sctp_m_freem(mret);
3210                 sctp_m_freem(copy_init);
3211                 return (NULL);
3212         }
3213 #ifdef SCTP_MBUF_LOGGING
3214         if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
3215                 struct mbuf *mat;
3216
3217                 mat = copy_initack;
3218                 while (mat) {
3219                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3220                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3221                         }
3222                         mat = SCTP_BUF_NEXT(mat);
3223                 }
3224         }
3225 #endif
3226         /* easy side we just drop it on the end */
3227         ph = mtod(mret, struct sctp_paramhdr *);
3228         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3229             sizeof(struct sctp_paramhdr);
3230         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3231             sizeof(struct sctp_paramhdr));
3232         ph->param_type = htons(SCTP_STATE_COOKIE);
3233         ph->param_length = 0;   /* fill in at the end */
3234         /* Fill in the stc cookie data */
3235         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3236
3237         /* tack the INIT and then the INIT-ACK onto the chain */
3238         cookie_sz = 0;
3239         m_at = mret;
3240         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3241                 cookie_sz += SCTP_BUF_LEN(m_at);
3242                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3243                         SCTP_BUF_NEXT(m_at) = copy_init;
3244                         break;
3245                 }
3246         }
3247
3248         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3249                 cookie_sz += SCTP_BUF_LEN(m_at);
3250                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3251                         SCTP_BUF_NEXT(m_at) = copy_initack;
3252                         break;
3253                 }
3254         }
3255
3256         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3257                 cookie_sz += SCTP_BUF_LEN(m_at);
3258                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3259                         break;
3260                 }
3261         }
3262         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3263         if (sig == NULL) {
3264                 /* no space, so free the entire chain */
3265                 sctp_m_freem(mret);
3266                 return (NULL);
3267         }
3268         SCTP_BUF_LEN(sig) = 0;
3269         SCTP_BUF_NEXT(m_at) = sig;
3270         sig_offset = 0;
3271         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3272         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3273         *signature = foo;
3274         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3275         cookie_sz += SCTP_SIGNATURE_SIZE;
3276         ph->param_length = htons(cookie_sz);
3277         return (mret);
3278 }
3279
3280
3281 static uint8_t
3282 sctp_get_ect(struct sctp_tcb *stcb,
3283     struct sctp_tmit_chunk *chk)
3284 {
3285         uint8_t this_random;
3286
3287         /* Huh? */
3288         if (sctp_ecn_enable == 0)
3289                 return (0);
3290
3291         if (sctp_ecn_nonce == 0)
3292                 /* no nonce, always return ECT0 */
3293                 return (SCTP_ECT0_BIT);
3294
3295         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
3296                 /* Peer does NOT support it, so we send a ECT0 only */
3297                 return (SCTP_ECT0_BIT);
3298         }
3299         if (chk == NULL)
3300                 return (SCTP_ECT0_BIT);
3301
3302         if ((stcb->asoc.hb_random_idx > 3) ||
3303             ((stcb->asoc.hb_random_idx == 3) &&
3304             (stcb->asoc.hb_ect_randombit > 7))) {
3305                 uint32_t rndval;
3306
3307 warp_drive_sa:
3308                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
3309                 memcpy(stcb->asoc.hb_random_values, &rndval,
3310                     sizeof(stcb->asoc.hb_random_values));
3311                 this_random = stcb->asoc.hb_random_values[0];
3312                 stcb->asoc.hb_random_idx = 0;
3313                 stcb->asoc.hb_ect_randombit = 0;
3314         } else {
3315                 if (stcb->asoc.hb_ect_randombit > 7) {
3316                         stcb->asoc.hb_ect_randombit = 0;
3317                         stcb->asoc.hb_random_idx++;
3318                         if (stcb->asoc.hb_random_idx > 3) {
3319                                 goto warp_drive_sa;
3320                         }
3321                 }
3322                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
3323         }
3324         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
3325                 if (chk != NULL)
3326                         /* ECN Nonce stuff */
3327                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
3328                 stcb->asoc.hb_ect_randombit++;
3329                 return (SCTP_ECT1_BIT);
3330         } else {
3331                 stcb->asoc.hb_ect_randombit++;
3332                 return (SCTP_ECT0_BIT);
3333         }
3334 }
3335
3336 static int
3337 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3338     struct sctp_tcb *stcb,      /* may be NULL */
3339     struct sctp_nets *net,
3340     struct sockaddr *to,
3341     struct mbuf *m,
3342     uint32_t auth_offset,
3343     struct sctp_auth_chunk *auth,
3344     int nofragment_flag,
3345     int ecn_ok,
3346     struct sctp_tmit_chunk *chk,
3347     int out_of_asoc_ok,
3348     int so_locked
3349 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3350     SCTP_UNUSED
3351 #endif
3352 )
3353 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3354 {
3355         /*
3356          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3357          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3358          * structure: - fill in the HMAC digest of any AUTH chunk in the
3359          * packet. - calculate and fill in the SCTP checksum. - prepend an
3360          * IP address header. - if boundall use INADDR_ANY. - if
3361          * boundspecific do source address selection. - set fragmentation
3362          * option for ipV4. - On return from IP output, check/adjust mtu
3363          * size of output interface and smallest_mtu size as well.
3364          */
3365         /* Will need ifdefs around this */
3366         struct mbuf *o_pak;
3367         struct mbuf *newm;
3368         struct sctphdr *sctphdr;
3369         int packet_length;
3370         uint32_t csum;
3371         int ret;
3372         uint32_t vrf_id;
3373         sctp_route_t *ro = NULL;
3374
3375         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3376                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3377                 sctp_m_freem(m);
3378                 return (EFAULT);
3379         }
3380         if (stcb) {
3381                 vrf_id = stcb->asoc.vrf_id;
3382         } else {
3383                 vrf_id = inp->def_vrf_id;
3384         }
3385
3386         /* fill in the HMAC digest for any AUTH chunk in the packet */
3387         if ((auth != NULL) && (stcb != NULL)) {
3388                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb);
3389         }
3390         /* Calculate the csum and fill in the length of the packet */
3391         sctphdr = mtod(m, struct sctphdr *);
3392         if (sctp_no_csum_on_loopback &&
3393             (stcb) &&
3394             (to->sa_family == AF_INET) &&
3395             (stcb->asoc.loopback_scope)) {
3396                 sctphdr->checksum = 0;
3397                 /*
3398                  * This can probably now be taken out since my audit shows
3399                  * no more bad pktlen's coming in. But we will wait a while
3400                  * yet.
3401                  */
3402                 packet_length = sctp_calculate_len(m);
3403         } else {
3404                 sctphdr->checksum = 0;
3405                 csum = sctp_calculate_sum(m, &packet_length, 0);
3406                 sctphdr->checksum = csum;
3407         }
3408
3409         if (to->sa_family == AF_INET) {
3410                 struct ip *ip = NULL;
3411                 sctp_route_t iproute;
3412                 uint8_t tos_value;
3413
3414                 newm = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
3415                 if (newm == NULL) {
3416                         sctp_m_freem(m);
3417                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3418                         return (ENOMEM);
3419                 }
3420                 SCTP_ALIGN_TO_END(newm, sizeof(struct ip));
3421                 SCTP_BUF_LEN(newm) = sizeof(struct ip);
3422                 packet_length += sizeof(struct ip);
3423                 SCTP_BUF_NEXT(newm) = m;
3424                 m = newm;
3425                 ip = mtod(m, struct ip *);
3426                 ip->ip_v = IPVERSION;
3427                 ip->ip_hl = (sizeof(struct ip) >> 2);
3428                 if (net) {
3429                         tos_value = net->tos_flowlabel & 0x000000ff;
3430                 } else {
3431                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3432                 }
3433                 if (nofragment_flag) {
3434 #if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__)
3435                         ip->ip_off = IP_DF;
3436 #else
3437                         ip->ip_off = htons(IP_DF);
3438 #endif
3439                 } else
3440                         ip->ip_off = 0;
3441
3442                 /* FreeBSD has a function for ip_id's */
3443                 ip->ip_id = ip_newid();
3444
3445                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3446                 ip->ip_len = packet_length;
3447                 if (stcb) {
3448                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3449                                 /* Enable ECN */
3450                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3451                         } else {
3452                                 /* No ECN */
3453                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3454                         }
3455                 } else {
3456                         /* no association at all */
3457                         ip->ip_tos = (tos_value & 0xfc);
3458                 }
3459                 ip->ip_p = IPPROTO_SCTP;
3460                 ip->ip_sum = 0;
3461                 if (net == NULL) {
3462                         ro = &iproute;
3463                         memset(&iproute, 0, sizeof(iproute));
3464                         memcpy(&ro->ro_dst, to, to->sa_len);
3465                 } else {
3466                         ro = (sctp_route_t *) & net->ro;
3467                 }
3468                 /* Now the address selection part */
3469                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3470
3471                 /* call the routine to select the src address */
3472                 if (net) {
3473                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3474                                 sctp_free_ifa(net->ro._s_addr);
3475                                 net->ro._s_addr = NULL;
3476                                 net->src_addr_selected = 0;
3477                                 if (ro->ro_rt) {
3478                                         RTFREE(ro->ro_rt);
3479                                         ro->ro_rt = NULL;
3480                                 }
3481                         }
3482                         if (net->src_addr_selected == 0) {
3483                                 if (out_of_asoc_ok) {
3484                                         /* do not cache */
3485                                         goto temp_v4_src;
3486                                 }
3487                                 /* Cache the source address */
3488                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3489                                     ro, net, out_of_asoc_ok,
3490                                     vrf_id);
3491                                 net->src_addr_selected = 1;
3492                         }
3493                         if (net->ro._s_addr == NULL) {
3494                                 /* No route to host */
3495                                 net->src_addr_selected = 0;
3496                                 goto no_route;
3497                         }
3498                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3499                 } else {
3500                         struct sctp_ifa *_lsrc;
3501
3502         temp_v4_src:
3503                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
3504                             net,
3505                             out_of_asoc_ok,
3506                             vrf_id);
3507                         if (_lsrc == NULL) {
3508                                 goto no_route;
3509                         }
3510                         ip->ip_src = _lsrc->address.sin.sin_addr;
3511                         sctp_free_ifa(_lsrc);
3512                 }
3513
3514                 /*
3515                  * If source address selection fails and we find no route
3516                  * then the ip_output should fail as well with a
3517                  * NO_ROUTE_TO_HOST type error. We probably should catch
3518                  * that somewhere and abort the association right away
3519                  * (assuming this is an INIT being sent).
3520                  */
3521                 if ((ro->ro_rt == NULL)) {
3522                         /*
3523                          * src addr selection failed to find a route (or
3524                          * valid source addr), so we can't get there from
3525                          * here (yet)!
3526                          */
3527         no_route:
3528                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3529                             "%s: dropped packet - no valid source addr\n",
3530                             __FUNCTION__);
3531                         if (net) {
3532                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3533                                     "Destination was ");
3534                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3535                                     &net->ro._l_addr.sa);
3536                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3537                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3538                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3539                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3540                                                     stcb,
3541                                                     SCTP_FAILED_THRESHOLD,
3542                                                     (void *)net,
3543                                                     so_locked);
3544                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3545                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3546                                                 /*
3547                                                  * JRS 5/14/07 - If a
3548                                                  * destination is
3549                                                  * unreachable, the PF bit
3550                                                  * is turned off.  This
3551                                                  * allows an unambiguous use
3552                                                  * of the PF bit for
3553                                                  * destinations that are
3554                                                  * reachable but potentially
3555                                                  * failed. If the
3556                                                  * destination is set to the
3557                                                  * unreachable state, also
3558                                                  * set the destination to
3559                                                  * the PF state.
3560                                                  */
3561                                                 /*
3562                                                  * Add debug message here if
3563                                                  * destination is not in PF
3564                                                  * state.
3565                                                  */
3566                                                 /*
3567                                                  * Stop any running T3
3568                                                  * timers here?
3569                                                  */
3570                                                 if (sctp_cmt_on_off && sctp_cmt_pf) {
3571                                                         net->dest_state &= ~SCTP_ADDR_PF;
3572                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3573                                                             net);
3574                                                 }
3575                                         }
3576                                 }
3577                                 if (stcb) {
3578                                         if (net == stcb->asoc.primary_destination) {
3579                                                 /* need a new primary */
3580                                                 struct sctp_nets *alt;
3581
3582                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3583                                                 if (alt != net) {
3584                                                         if (sctp_set_primary_addr(stcb,
3585                                                             (struct sockaddr *)NULL,
3586                                                             alt) == 0) {
3587                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3588                                                                 if (net->ro._s_addr) {
3589                                                                         sctp_free_ifa(net->ro._s_addr);
3590                                                                         net->ro._s_addr = NULL;
3591                                                                 }
3592                                                                 net->src_addr_selected = 0;
3593                                                         }
3594                                                 }
3595                                         }
3596                                 }
3597                         }
3598                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3599                         sctp_m_freem(m);
3600                         return (EHOSTUNREACH);
3601                 }
3602                 if (ro != &iproute) {
3603                         memcpy(&iproute, ro, sizeof(*ro));
3604                 }
3605                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3606                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3607                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3608                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3609                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3610                     ro->ro_rt);
3611
3612                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3613                         /* failed to prepend data, give up */
3614                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3615                         sctp_m_freem(m);
3616                         return (ENOMEM);
3617                 }
3618 #ifdef  SCTP_PACKET_LOGGING
3619                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
3620                         sctp_packet_log(m, packet_length);
3621 #endif
3622                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3623
3624                 /* send it out.  table id is taken from stcb */
3625                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3626
3627                 SCTP_STAT_INCR(sctps_sendpackets);
3628                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3629                 if (ret)
3630                         SCTP_STAT_INCR(sctps_senderrors);
3631
3632                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3633                 if (net == NULL) {
3634                         /* free tempy routes */
3635                         if (ro->ro_rt) {
3636                                 RTFREE(ro->ro_rt);
3637                                 ro->ro_rt = NULL;
3638                         }
3639                 } else {
3640                         /* PMTU check versus smallest asoc MTU goes here */
3641                         if ((ro->ro_rt != NULL) &&
3642                             (net->ro._s_addr)) {
3643                                 uint32_t mtu;
3644
3645                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3646                                 if (mtu &&
3647                                     (stcb->asoc.smallest_mtu > mtu)) {
3648 #ifdef SCTP_PRINT_FOR_B_AND_M
3649                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n",
3650                                             mtu);
3651 #endif
3652                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3653                                         net->mtu = mtu;
3654                                 }
3655                         } else if (ro->ro_rt == NULL) {
3656                                 /* route was freed */
3657                                 if (net->ro._s_addr &&
3658                                     net->src_addr_selected) {
3659                                         sctp_free_ifa(net->ro._s_addr);
3660                                         net->ro._s_addr = NULL;
3661                                 }
3662                                 net->src_addr_selected = 0;
3663                         }
3664                 }
3665                 return (ret);
3666         }
3667 #ifdef INET6
3668         else if (to->sa_family == AF_INET6) {
3669                 uint32_t flowlabel;
3670                 struct ip6_hdr *ip6h;
3671                 struct route_in6 ip6route;
3672                 struct ifnet *ifp;
3673                 u_char flowTop;
3674                 uint16_t flowBottom;
3675                 u_char tosBottom, tosTop;
3676                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3677                 int prev_scope = 0;
3678                 struct sockaddr_in6 lsa6_storage;
3679                 int error;
3680                 u_short prev_port = 0;
3681
3682                 if (net != NULL) {
3683                         flowlabel = net->tos_flowlabel;
3684                 } else {
3685                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3686                 }
3687
3688                 newm = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
3689                 if (newm == NULL) {
3690                         sctp_m_freem(m);
3691                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3692                         return (ENOMEM);
3693                 }
3694                 SCTP_ALIGN_TO_END(newm, sizeof(struct ip6_hdr));
3695                 SCTP_BUF_LEN(newm) = sizeof(struct ip6_hdr);
3696                 packet_length += sizeof(struct ip6_hdr);
3697                 SCTP_BUF_NEXT(newm) = m;
3698                 m = newm;
3699
3700                 ip6h = mtod(m, struct ip6_hdr *);
3701                 /*
3702                  * We assume here that inp_flow is in host byte order within
3703                  * the TCB!
3704                  */
3705                 flowBottom = flowlabel & 0x0000ffff;
3706                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3707                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3708                 /* protect *sin6 from overwrite */
3709                 sin6 = (struct sockaddr_in6 *)to;
3710                 tmp = *sin6;
3711                 sin6 = &tmp;
3712
3713                 /* KAME hack: embed scopeid */
3714                 if (sa6_embedscope(sin6, ip6_use_defzone) != 0) {
3715                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3716                         return (EINVAL);
3717                 }
3718                 if (net == NULL) {
3719                         memset(&ip6route, 0, sizeof(ip6route));
3720                         ro = (sctp_route_t *) & ip6route;
3721                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3722                 } else {
3723                         ro = (sctp_route_t *) & net->ro;
3724                 }
3725                 if (stcb != NULL) {
3726                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3727                                 /* Enable ECN */
3728                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3729                         } else {
3730                                 /* No ECN */
3731                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3732                         }
3733                 } else {
3734                         /* we could get no asoc if it is a O-O-T-B packet */
3735                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3736                 }
3737                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3738                 ip6h->ip6_nxt = IPPROTO_SCTP;
3739                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3740                 ip6h->ip6_dst = sin6->sin6_addr;
3741
3742                 /*
3743                  * Add SRC address selection here: we can only reuse to a
3744                  * limited degree the kame src-addr-sel, since we can try
3745                  * their selection but it may not be bound.
3746                  */
3747                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3748                 lsa6_tmp.sin6_family = AF_INET6;
3749                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3750                 lsa6 = &lsa6_tmp;
3751                 if (net) {
3752                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3753                                 sctp_free_ifa(net->ro._s_addr);
3754                                 net->ro._s_addr = NULL;
3755                                 net->src_addr_selected = 0;
3756                                 if (ro->ro_rt) {
3757                                         RTFREE(ro->ro_rt);
3758                                         ro->ro_rt = NULL;
3759                                 }
3760                         }
3761                         if (net->src_addr_selected == 0) {
3762                                 if (out_of_asoc_ok) {
3763                                         /* do not cache */
3764                                         goto temp_v6_src;
3765                                 }
3766                                 /* Cache the source address */
3767                                 net->ro._s_addr = sctp_source_address_selection(inp,
3768                                     stcb,
3769                                     ro,
3770                                     net,
3771                                     out_of_asoc_ok,
3772                                     vrf_id);
3773                                 net->src_addr_selected = 1;
3774                         }
3775                         if (net->ro._s_addr == NULL) {
3776                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3777                                 net->src_addr_selected = 0;
3778                                 goto no_route;
3779                         }
3780                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3781                 } else {
3782                         struct sctp_ifa *_lsrc;
3783
3784         temp_v6_src:
3785                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
3786                             net,
3787                             out_of_asoc_ok,
3788                             vrf_id);
3789                         if (_lsrc == NULL) {
3790                                 goto no_route;
3791                         }
3792                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3793                         sctp_free_ifa(_lsrc);
3794                 }
3795                 lsa6->sin6_port = inp->sctp_lport;
3796
3797                 if ((ro->ro_rt == NULL)) {
3798                         /*
3799                          * src addr selection failed to find a route (or
3800                          * valid source addr), so we can't get there from
3801                          * here!
3802                          */
3803                         goto no_route;
3804                 }
3805                 /*
3806                  * XXX: sa6 may not have a valid sin6_scope_id in the
3807                  * non-SCOPEDROUTING case.
3808                  */
3809                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3810                 lsa6_storage.sin6_family = AF_INET6;
3811                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3812                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3813                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3814                         sctp_m_freem(m);
3815                         return (error);
3816                 }
3817                 /* XXX */
3818                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3819                 lsa6_storage.sin6_port = inp->sctp_lport;
3820                 lsa6 = &lsa6_storage;
3821                 ip6h->ip6_src = lsa6->sin6_addr;
3822
3823                 /*
3824                  * We set the hop limit now since there is a good chance
3825                  * that our ro pointer is now filled
3826                  */
3827                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
3828                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
3829
3830 #ifdef SCTP_DEBUG
3831                 /* Copy to be sure something bad is not happening */
3832                 sin6->sin6_addr = ip6h->ip6_dst;
3833                 lsa6->sin6_addr = ip6h->ip6_src;
3834 #endif
3835
3836                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
3837                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
3838                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
3839                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
3840                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
3841                 if (net) {
3842                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3843                         /* preserve the port and scope for link local send */
3844                         prev_scope = sin6->sin6_scope_id;
3845                         prev_port = sin6->sin6_port;
3846                 }
3847                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3848                         /* failed to prepend data, give up */
3849                         sctp_m_freem(m);
3850                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3851                         return (ENOMEM);
3852                 }
3853 #ifdef  SCTP_PACKET_LOGGING
3854                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
3855                         sctp_packet_log(m, packet_length);
3856 #endif
3857                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3858
3859                 /* send it out. table id is taken from stcb */
3860                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp,
3861                     stcb, vrf_id);
3862
3863                 if (net) {
3864                         /* for link local this must be done */
3865                         sin6->sin6_scope_id = prev_scope;
3866                         sin6->sin6_port = prev_port;
3867                 }
3868                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
3869                 SCTP_STAT_INCR(sctps_sendpackets);
3870                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3871                 if (ret) {
3872                         SCTP_STAT_INCR(sctps_senderrors);
3873                 }
3874                 if (net == NULL) {
3875                         /* Now if we had a temp route free it */
3876                         if (ro->ro_rt) {
3877                                 RTFREE(ro->ro_rt);
3878                         }
3879                 } else {
3880                         /* PMTU check versus smallest asoc MTU goes here */
3881                         if (ro->ro_rt == NULL) {
3882                                 /* Route was freed */
3883                                 if (net->ro._s_addr &&
3884                                     net->src_addr_selected) {
3885                                         sctp_free_ifa(net->ro._s_addr);
3886                                         net->ro._s_addr = NULL;
3887                                 }
3888                                 net->src_addr_selected = 0;
3889                         }
3890                         if ((ro->ro_rt != NULL) &&
3891                             (net->ro._s_addr)) {
3892                                 uint32_t mtu;
3893
3894                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3895                                 if (mtu &&
3896                                     (stcb->asoc.smallest_mtu > mtu)) {
3897 #ifdef SCTP_PRINT_FOR_B_AND_M
3898                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
3899                                             mtu);
3900 #endif
3901                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3902                                         net->mtu = mtu;
3903                                 }
3904                         } else if (ifp) {
3905                                 if (ND_IFINFO(ifp)->linkmtu &&
3906                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
3907 #ifdef SCTP_PRINT_FOR_B_AND_M
3908                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
3909                                             ND_IFINFO(ifp)->linkmtu);
3910 #endif
3911                                         sctp_mtu_size_reset(inp,
3912                                             &stcb->asoc,
3913                                             ND_IFINFO(ifp)->linkmtu);
3914                                 }
3915                         }
3916                 }
3917                 return (ret);
3918         }
3919 #endif
3920         else {
3921                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
3922                     ((struct sockaddr *)to)->sa_family);
3923                 sctp_m_freem(m);
3924                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3925                 return (EFAULT);
3926         }
3927 }
3928
3929
3930 void
3931 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
3932 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3933     SCTP_UNUSED
3934 #endif
3935 )
3936 {
3937         struct mbuf *m, *m_at, *mp_last;
3938         struct sctp_nets *net;
3939         struct sctp_init_msg *initm;
3940         struct sctp_supported_addr_param *sup_addr;
3941         struct sctp_ecn_supported_param *ecn;
3942         struct sctp_prsctp_supported_param *prsctp;
3943         struct sctp_ecn_nonce_supported_param *ecn_nonce;
3944         struct sctp_supported_chunk_types_param *pr_supported;
3945         int cnt_inits_to = 0;
3946         int padval, ret;
3947         int num_ext;
3948         int p_len;
3949
3950         /* INIT's always go to the primary (and usually ONLY address) */
3951         mp_last = NULL;
3952         net = stcb->asoc.primary_destination;
3953         if (net == NULL) {
3954                 net = TAILQ_FIRST(&stcb->asoc.nets);
3955                 if (net == NULL) {
3956                         /* TSNH */
3957                         return;
3958                 }
3959                 /* we confirm any address we send an INIT to */
3960                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
3961                 (void)sctp_set_primary_addr(stcb, NULL, net);
3962         } else {
3963                 /* we confirm any address we send an INIT to */
3964                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
3965         }
3966         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
3967 #ifdef INET6
3968         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
3969                 /*
3970                  * special hook, if we are sending to link local it will not
3971                  * show up in our private address count.
3972                  */
3973                 struct sockaddr_in6 *sin6l;
3974
3975                 sin6l = &net->ro._l_addr.sin6;
3976                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
3977                         cnt_inits_to = 1;
3978         }
3979 #endif
3980         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
3981                 /* This case should not happen */
3982                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
3983                 return;
3984         }
3985         /* start the INIT timer */
3986         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
3987
3988         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
3989         if (m == NULL) {
3990                 /* No memory, INIT timer will re-attempt. */
3991                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
3992                 return;
3993         }
3994         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
3995         /*
3996          * assume peer supports asconf in order to be able to queue local
3997          * address changes while an INIT is in flight and before the assoc
3998          * is established.
3999          */
4000         stcb->asoc.peer_supports_asconf = 1;
4001         /* Now lets put the SCTP header in place */
4002         initm = mtod(m, struct sctp_init_msg *);
4003         initm->sh.src_port = inp->sctp_lport;
4004         initm->sh.dest_port = stcb->rport;
4005         initm->sh.v_tag = 0;
4006         initm->sh.checksum = 0; /* calculate later */
4007         /* now the chunk header */
4008         initm->msg.ch.chunk_type = SCTP_INITIATION;
4009         initm->msg.ch.chunk_flags = 0;
4010         /* fill in later from mbuf we build */
4011         initm->msg.ch.chunk_length = 0;
4012         /* place in my tag */
4013         initm->msg.init.initiate_tag = htonl(stcb->asoc.my_vtag);
4014         /* set up some of the credits. */
4015         initm->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(inp->sctp_socket),
4016             SCTP_MINIMAL_RWND));
4017
4018         initm->msg.init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4019         initm->msg.init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4020         initm->msg.init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4021         /* now the address restriction */
4022         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)initm +
4023             sizeof(*initm));
4024         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4025 #ifdef INET6
4026         /* we support 2 types: IPv6/IPv4 */
4027         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4028         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4029         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4030 #else
4031         /* we support 1 type: IPv4 */
4032         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4033         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4034         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4035 #endif
4036         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4037
4038         if (inp->sctp_ep.adaptation_layer_indicator) {
4039                 struct sctp_adaptation_layer_indication *ali;
4040
4041                 ali = (struct sctp_adaptation_layer_indication *)(
4042                     (caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4043                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4044                 ali->ph.param_length = htons(sizeof(*ali));
4045                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4046                 SCTP_BUF_LEN(m) += sizeof(*ali);
4047                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
4048                     sizeof(*ali));
4049         } else {
4050                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)sup_addr +
4051                     sizeof(*sup_addr) + sizeof(uint16_t));
4052         }
4053
4054         /* now any cookie time extensions */
4055         if (stcb->asoc.cookie_preserve_req) {
4056                 struct sctp_cookie_perserve_param *cookie_preserve;
4057
4058                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4059                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4060                 cookie_preserve->ph.param_length = htons(
4061                     sizeof(*cookie_preserve));
4062                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4063                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4064                 ecn = (struct sctp_ecn_supported_param *)(
4065                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4066                 stcb->asoc.cookie_preserve_req = 0;
4067         }
4068         /* ECN parameter */
4069         if (sctp_ecn_enable == 1) {
4070                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4071                 ecn->ph.param_length = htons(sizeof(*ecn));
4072                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4073                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4074                     sizeof(*ecn));
4075         } else {
4076                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4077         }
4078         /* And now tell the peer we do pr-sctp */
4079         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4080         prsctp->ph.param_length = htons(sizeof(*prsctp));
4081         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4082
4083         /* And now tell the peer we do all the extensions */
4084         pr_supported = (struct sctp_supported_chunk_types_param *)
4085             ((caddr_t)prsctp + sizeof(*prsctp));
4086         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4087         num_ext = 0;
4088         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4089         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4090         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4091         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4092         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4093         if (!sctp_auth_disable)
4094                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4095         p_len = sizeof(*pr_supported) + num_ext;
4096         pr_supported->ph.param_length = htons(p_len);
4097         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4098         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4099
4100         /* ECN nonce: And now tell the peer we support ECN nonce */
4101         if (sctp_ecn_nonce) {
4102                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4103                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4104                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4105                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4106                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4107         }
4108         /* add authentication parameters */
4109         if (!sctp_auth_disable) {
4110                 struct sctp_auth_random *randp;
4111                 struct sctp_auth_hmac_algo *hmacs;
4112                 struct sctp_auth_chunk_list *chunks;
4113
4114                 /* attach RANDOM parameter, if available */
4115                 if (stcb->asoc.authinfo.random != NULL) {
4116                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4117                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4118 #ifdef SCTP_AUTH_DRAFT_04
4119                         randp->ph.param_type = htons(SCTP_RANDOM);
4120                         randp->ph.param_length = htons(p_len);
4121                         bcopy(stcb->asoc.authinfo.random->key,
4122                             randp->random_data,
4123                             stcb->asoc.authinfo.random_len);
4124 #else
4125                         /* random key already contains the header */
4126                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4127 #endif
4128                         /* zero out any padding required */
4129                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4130                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4131                 }
4132                 /* add HMAC_ALGO parameter */
4133                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4134                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4135                     (uint8_t *) hmacs->hmac_ids);
4136                 if (p_len > 0) {
4137                         p_len += sizeof(*hmacs);
4138                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4139                         hmacs->ph.param_length = htons(p_len);
4140                         /* zero out any padding required */
4141                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4142                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4143                 }
4144                 /* add CHUNKS parameter */
4145                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4146                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4147                     chunks->chunk_types);
4148                 if (p_len > 0) {
4149                         p_len += sizeof(*chunks);
4150                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4151                         chunks->ph.param_length = htons(p_len);
4152                         /* zero out any padding required */
4153                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4154                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4155                 }
4156         }
4157         m_at = m;
4158         /* now the addresses */
4159         {
4160                 struct sctp_scoping scp;
4161
4162                 /*
4163                  * To optimize this we could put the scoping stuff into a
4164                  * structure and remove the individual uint8's from the
4165                  * assoc structure. Then we could just sifa in the address
4166                  * within the stcb.. but for now this is a quick hack to get
4167                  * the address stuff teased apart.
4168                  */
4169                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4170                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4171                 scp.loopback_scope = stcb->asoc.loopback_scope;
4172                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4173                 scp.local_scope = stcb->asoc.local_scope;
4174                 scp.site_scope = stcb->asoc.site_scope;
4175
4176                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4177         }
4178
4179         /* calulate the size and update pkt header and chunk header */
4180         p_len = 0;
4181         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4182                 if (SCTP_BUF_NEXT(m_at) == NULL)
4183                         mp_last = m_at;
4184                 p_len += SCTP_BUF_LEN(m_at);
4185         }
4186         initm->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
4187         /*
4188          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4189          * here since the timer will drive a retranmission.
4190          */
4191
4192         /* I don't expect this to execute but we will be safe here */
4193         padval = p_len % 4;
4194         if ((padval) && (mp_last)) {
4195                 /*
4196                  * The compiler worries that mp_last may not be set even
4197                  * though I think it is impossible :-> however we add
4198                  * mp_last here just in case.
4199                  */
4200                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4201                 if (ret) {
4202                         /* Houston we have a problem, no space */
4203                         sctp_m_freem(m);
4204                         return;
4205                 }
4206                 p_len += padval;
4207         }
4208         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4209         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4210             (struct sockaddr *)&net->ro._l_addr,
4211             m, 0, NULL, 0, 0, NULL, 0, so_locked);
4212         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4213         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4214         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4215         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4216 }
4217
4218 struct mbuf *
4219 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4220     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp)
4221 {
4222         /*
4223          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4224          * being equal to the beginning of the params i.e. (iphlen +
4225          * sizeof(struct sctp_init_msg) parse through the parameters to the
4226          * end of the mbuf verifying that all parameters are known.
4227          *
4228          * For unknown parameters build and return a mbuf with
4229          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4230          * processing this chunk stop, and set *abort_processing to 1.
4231          *
4232          * By having param_offset be pre-set to where parameters begin it is
4233          * hoped that this routine may be reused in the future by new
4234          * features.
4235          */
4236         struct sctp_paramhdr *phdr, params;
4237
4238         struct mbuf *mat, *op_err;
4239         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4240         int at, limit, pad_needed;
4241         uint16_t ptype, plen, padded_size;
4242         int err_at;
4243
4244         *abort_processing = 0;
4245         mat = in_initpkt;
4246         err_at = 0;
4247         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4248         at = param_offset;
4249         op_err = NULL;
4250         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4251         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4252         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4253                 ptype = ntohs(phdr->param_type);
4254                 plen = ntohs(phdr->param_length);
4255                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4256                         /* wacked parameter */
4257                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4258                         goto invalid_size;
4259                 }
4260                 limit -= SCTP_SIZE32(plen);
4261                 /*-
4262                  * All parameters for all chunks that we know/understand are
4263                  * listed here. We process them other places and make
4264                  * appropriate stop actions per the upper bits. However this
4265                  * is the generic routine processor's can call to get back
4266                  * an operr.. to either incorporate (init-ack) or send.
4267                  */
4268                 padded_size = SCTP_SIZE32(plen);
4269                 switch (ptype) {
4270                         /* Param's with variable size */
4271                 case SCTP_HEARTBEAT_INFO:
4272                 case SCTP_STATE_COOKIE:
4273                 case SCTP_UNRECOG_PARAM:
4274                 case SCTP_ERROR_CAUSE_IND:
4275                         /* ok skip fwd */
4276                         at += padded_size;
4277                         break;
4278                         /* Param's with variable size within a range */
4279                 case SCTP_CHUNK_LIST:
4280                 case SCTP_SUPPORTED_CHUNK_EXT:
4281                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4282                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4283                                 goto invalid_size;
4284                         }
4285                         at += padded_size;
4286                         break;
4287                 case SCTP_SUPPORTED_ADDRTYPE:
4288                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4289                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4290                                 goto invalid_size;
4291                         }
4292                         at += padded_size;
4293                         break;
4294                 case SCTP_RANDOM:
4295                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4296                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4297                                 goto invalid_size;
4298                         }
4299                         at += padded_size;
4300                         break;
4301                 case SCTP_SET_PRIM_ADDR:
4302                 case SCTP_DEL_IP_ADDRESS:
4303                 case SCTP_ADD_IP_ADDRESS:
4304                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4305                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4306                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4307                                 goto invalid_size;
4308                         }
4309                         at += padded_size;
4310                         break;
4311                         /* Param's with a fixed size */
4312                 case SCTP_IPV4_ADDRESS:
4313                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4314                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4315                                 goto invalid_size;
4316                         }
4317                         at += padded_size;
4318                         break;
4319                 case SCTP_IPV6_ADDRESS:
4320                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4321                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4322                                 goto invalid_size;
4323                         }
4324                         at += padded_size;
4325                         break;
4326                 case SCTP_COOKIE_PRESERVE:
4327                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4328                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4329                                 goto invalid_size;
4330                         }
4331                         at += padded_size;
4332                         break;
4333                 case SCTP_ECN_NONCE_SUPPORTED:
4334                 case SCTP_PRSCTP_SUPPORTED:
4335                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4336                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp %d\n", plen);
4337                                 goto invalid_size;
4338                         }
4339                         at += padded_size;
4340                         break;
4341                 case SCTP_ECN_CAPABLE:
4342                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4343                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4344                                 goto invalid_size;
4345                         }
4346                         at += padded_size;
4347                         break;
4348                 case SCTP_ULP_ADAPTATION:
4349                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4350                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4351                                 goto invalid_size;
4352                         }
4353                         at += padded_size;
4354                         break;
4355                 case SCTP_SUCCESS_REPORT:
4356                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4357                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4358                                 goto invalid_size;
4359                         }
4360                         at += padded_size;
4361                         break;
4362                 case SCTP_HOSTNAME_ADDRESS:
4363                         {
4364                                 /* We can NOT handle HOST NAME addresses!! */
4365                                 int l_len;
4366
4367                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4368                                 *abort_processing = 1;
4369                                 if (op_err == NULL) {
4370                                         /* Ok need to try to get a mbuf */
4371 #ifdef INET6
4372                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4373 #else
4374                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4375 #endif
4376                                         l_len += plen;
4377                                         l_len += sizeof(struct sctp_paramhdr);
4378                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4379                                         if (op_err) {
4380                                                 SCTP_BUF_LEN(op_err) = 0;
4381                                                 /*
4382                                                  * pre-reserve space for ip
4383                                                  * and sctp header  and
4384                                                  * chunk hdr
4385                                                  */
4386 #ifdef INET6
4387                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4388 #else
4389                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4390 #endif
4391                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4392                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4393                                         }
4394                                 }
4395                                 if (op_err) {
4396                                         /* If we have space */
4397                                         struct sctp_paramhdr s;
4398
4399                                         if (err_at % 4) {
4400                                                 uint32_t cpthis = 0;
4401
4402                                                 pad_needed = 4 - (err_at % 4);
4403                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4404                                                 err_at += pad_needed;
4405                                         }
4406                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4407                                         s.param_length = htons(sizeof(s) + plen);
4408                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4409                                         err_at += sizeof(s);
4410                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4411                                         if (phdr == NULL) {
4412                                                 sctp_m_freem(op_err);
4413                                                 /*
4414                                                  * we are out of memory but
4415                                                  * we still need to have a
4416                                                  * look at what to do (the
4417                                                  * system is in trouble
4418                                                  * though).
4419                                                  */
4420                                                 return (NULL);
4421                                         }
4422                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4423                                         err_at += plen;
4424                                 }
4425                                 return (op_err);
4426                                 break;
4427                         }
4428                 default:
4429                         /*
4430                          * we do not recognize the parameter figure out what
4431                          * we do.
4432                          */
4433                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4434                         if ((ptype & 0x4000) == 0x4000) {
4435                                 /* Report bit is set?? */
4436                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4437                                 if (op_err == NULL) {
4438                                         int l_len;
4439
4440                                         /* Ok need to try to get an mbuf */
4441 #ifdef INET6
4442                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4443 #else
4444                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4445 #endif
4446                                         l_len += plen;
4447                                         l_len += sizeof(struct sctp_paramhdr);
4448                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4449                                         if (op_err) {
4450                                                 SCTP_BUF_LEN(op_err) = 0;
4451 #ifdef INET6
4452                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4453 #else
4454                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4455 #endif
4456                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4457                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4458                                         }
4459                                 }
4460                                 if (op_err) {
4461                                         /* If we have space */
4462                                         struct sctp_paramhdr s;
4463
4464                                         if (err_at % 4) {
4465                                                 uint32_t cpthis = 0;
4466
4467                                                 pad_needed = 4 - (err_at % 4);
4468                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4469                                                 err_at += pad_needed;
4470                                         }
4471                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4472                                         s.param_length = htons(sizeof(s) + plen);
4473                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4474                                         err_at += sizeof(s);
4475                                         if (plen > sizeof(tempbuf)) {
4476                                                 plen = sizeof(tempbuf);
4477                                         }
4478                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4479                                         if (phdr == NULL) {
4480                                                 sctp_m_freem(op_err);
4481                                                 /*
4482                                                  * we are out of memory but
4483                                                  * we still need to have a
4484                                                  * look at what to do (the
4485                                                  * system is in trouble
4486                                                  * though).
4487                                                  */
4488                                                 op_err = NULL;
4489                                                 goto more_processing;
4490                                         }
4491                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4492                                         err_at += plen;
4493                                 }
4494                         }
4495         more_processing:
4496                         if ((ptype & 0x8000) == 0x0000) {
4497                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4498                                 return (op_err);
4499                         } else {
4500                                 /* skip this chunk and continue processing */
4501                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4502                                 at += SCTP_SIZE32(plen);
4503                         }
4504                         break;
4505
4506                 }
4507                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4508         }
4509         return (op_err);
4510 invalid_size:
4511         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4512         *abort_processing = 1;
4513         if ((op_err == NULL) && phdr) {
4514                 int l_len;
4515
4516 #ifdef INET6
4517                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4518 #else
4519                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4520 #endif
4521                 l_len += (2 * sizeof(struct sctp_paramhdr));
4522                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4523                 if (op_err) {
4524                         SCTP_BUF_LEN(op_err) = 0;
4525 #ifdef INET6
4526                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4527 #else
4528                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4529 #endif
4530                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4531                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4532                 }
4533         }
4534         if ((op_err) && phdr) {
4535                 struct sctp_paramhdr s;
4536
4537                 if (err_at % 4) {
4538                         uint32_t cpthis = 0;
4539
4540                         pad_needed = 4 - (err_at % 4);
4541                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4542                         err_at += pad_needed;
4543                 }
4544                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4545                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4546                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4547                 err_at += sizeof(s);
4548                 /* Only copy back the p-hdr that caused the issue */
4549                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4550         }
4551         return (op_err);
4552 }
4553
4554 static int
4555 sctp_are_there_new_addresses(struct sctp_association *asoc,
4556     struct mbuf *in_initpkt, int iphlen, int offset)
4557 {
4558         /*
4559          * Given a INIT packet, look through the packet to verify that there
4560          * are NO new addresses. As we go through the parameters add reports
4561          * of any un-understood parameters that require an error.  Also we
4562          * must return (1) to drop the packet if we see a un-understood
4563          * parameter that tells us to drop the chunk.
4564          */
4565         struct sockaddr_in sin4, *sa4;
4566
4567 #ifdef INET6
4568         struct sockaddr_in6 sin6, *sa6;
4569
4570 #endif
4571         struct sockaddr *sa_touse;
4572         struct sockaddr *sa;
4573         struct sctp_paramhdr *phdr, params;
4574         struct ip *iph;
4575
4576 #ifdef INET6
4577         struct ip6_hdr *ip6h;
4578
4579 #endif
4580         struct mbuf *mat;
4581         uint16_t ptype, plen;
4582         int err_at;
4583         uint8_t fnd;
4584         struct sctp_nets *net;
4585
4586         memset(&sin4, 0, sizeof(sin4));
4587 #ifdef INET6
4588         memset(&sin6, 0, sizeof(sin6));
4589 #endif
4590         sin4.sin_family = AF_INET;
4591         sin4.sin_len = sizeof(sin4);
4592 #ifdef INET6
4593         sin6.sin6_family = AF_INET6;
4594         sin6.sin6_len = sizeof(sin6);
4595 #endif
4596         sa_touse = NULL;
4597         /* First what about the src address of the pkt ? */
4598         iph = mtod(in_initpkt, struct ip *);
4599         switch (iph->ip_v) {
4600         case IPVERSION:
4601                 /* source addr is IPv4 */
4602                 sin4.sin_addr = iph->ip_src;
4603                 sa_touse = (struct sockaddr *)&sin4;
4604                 break;
4605 #ifdef INET6
4606         case IPV6_VERSION >> 4:
4607                 /* source addr is IPv6 */
4608                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4609                 sin6.sin6_addr = ip6h->ip6_src;
4610                 sa_touse = (struct sockaddr *)&sin6;
4611                 break;
4612 #endif
4613         default:
4614                 return (1);
4615         }
4616
4617         fnd = 0;
4618         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4619                 sa = (struct sockaddr *)&net->ro._l_addr;
4620                 if (sa->sa_family == sa_touse->sa_family) {
4621                         if (sa->sa_family == AF_INET) {
4622                                 sa4 = (struct sockaddr_in *)sa;
4623                                 if (sa4->sin_addr.s_addr ==
4624                                     sin4.sin_addr.s_addr) {
4625                                         fnd = 1;
4626                                         break;
4627                                 }
4628                         }
4629 #ifdef INET6
4630                         if (sa->sa_family == AF_INET6) {
4631                                 sa6 = (struct sockaddr_in6 *)sa;
4632                                 if (SCTP6_ARE_ADDR_EQUAL(&sa6->sin6_addr,
4633                                     &sin6.sin6_addr)) {
4634                                         fnd = 1;
4635                                         break;
4636                                 }
4637                         }
4638 #endif
4639                 }
4640         }
4641         if (fnd == 0) {
4642                 /* New address added! no need to look futher. */
4643                 return (1);
4644         }
4645         /* Ok so far lets munge through the rest of the packet */
4646         mat = in_initpkt;
4647         err_at = 0;
4648         sa_touse = NULL;
4649         offset += sizeof(struct sctp_init_chunk);
4650         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4651         while (phdr) {
4652                 ptype = ntohs(phdr->param_type);
4653                 plen = ntohs(phdr->param_length);
4654                 if (ptype == SCTP_IPV4_ADDRESS) {
4655                         struct sctp_ipv4addr_param *p4, p4_buf;
4656
4657                         phdr = sctp_get_next_param(mat, offset,
4658                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4659                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4660                             phdr == NULL) {
4661                                 return (1);
4662                         }
4663                         p4 = (struct sctp_ipv4addr_param *)phdr;
4664                         sin4.sin_addr.s_addr = p4->addr;
4665                         sa_touse = (struct sockaddr *)&sin4;
4666                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4667                         struct sctp_ipv6addr_param *p6, p6_buf;
4668
4669                         phdr = sctp_get_next_param(mat, offset,
4670                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4671                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4672                             phdr == NULL) {
4673                                 return (1);
4674                         }
4675                         p6 = (struct sctp_ipv6addr_param *)phdr;
4676 #ifdef INET6
4677                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4678                             sizeof(p6->addr));
4679 #endif
4680                         sa_touse = (struct sockaddr *)&sin4;
4681                 }
4682                 if (sa_touse) {
4683                         /* ok, sa_touse points to one to check */
4684                         fnd = 0;
4685                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4686                                 sa = (struct sockaddr *)&net->ro._l_addr;
4687                                 if (sa->sa_family != sa_touse->sa_family) {
4688                                         continue;
4689                                 }
4690                                 if (sa->sa_family == AF_INET) {
4691                                         sa4 = (struct sockaddr_in *)sa;
4692                                         if (sa4->sin_addr.s_addr ==
4693                                             sin4.sin_addr.s_addr) {
4694                                                 fnd = 1;
4695                                                 break;
4696                                         }
4697                                 }
4698 #ifdef INET6
4699                                 if (sa->sa_family == AF_INET6) {
4700                                         sa6 = (struct sockaddr_in6 *)sa;
4701                                         if (SCTP6_ARE_ADDR_EQUAL(
4702                                             &sa6->sin6_addr, &sin6.sin6_addr)) {
4703                                                 fnd = 1;
4704                                                 break;
4705                                         }
4706                                 }
4707 #endif
4708                         }
4709                         if (!fnd) {
4710                                 /* New addr added! no need to look further */
4711                                 return (1);
4712                         }
4713                 }
4714                 offset += SCTP_SIZE32(plen);
4715                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4716         }
4717         return (0);
4718 }
4719
4720 /*
4721  * Given a MBUF chain that was sent into us containing an INIT. Build a
4722  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4723  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4724  * message (i.e. the struct sctp_init_msg).
4725  */
4726 void
4727 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4728     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4729     struct sctp_init_chunk *init_chk, uint32_t vrf_id, int hold_inp_lock)
4730 {
4731         struct sctp_association *asoc;
4732         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4733         struct sctp_init_msg *initackm_out;
4734         struct sctp_ecn_supported_param *ecn;
4735         struct sctp_prsctp_supported_param *prsctp;
4736         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4737         struct sctp_supported_chunk_types_param *pr_supported;
4738         struct sockaddr_storage store;
4739         struct sockaddr_in *sin;
4740
4741 #ifdef INET6
4742         struct sockaddr_in6 *sin6;
4743
4744 #endif
4745         sctp_route_t *ro;
4746         struct ip *iph;
4747
4748 #ifdef INET6
4749         struct ip6_hdr *ip6;
4750
4751 #endif
4752         struct sockaddr *to;
4753         struct sctp_state_cookie stc;
4754         struct sctp_nets *net = NULL;
4755         uint8_t *signature = NULL;
4756         int cnt_inits_to = 0;
4757         uint16_t his_limit, i_want;
4758         int abort_flag, padval;
4759         int num_ext;
4760         int p_len;
4761         struct socket *so;
4762
4763         if (stcb)
4764                 asoc = &stcb->asoc;
4765         else
4766                 asoc = NULL;
4767         mp_last = NULL;
4768         if ((asoc != NULL) &&
4769             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4770             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4771                 /* new addresses, out of here in non-cookie-wait states */
4772                 /*
4773                  * Send a ABORT, we don't add the new address error clause
4774                  * though we even set the T bit and copy in the 0 tag.. this
4775                  * looks no different than if no listener was present.
4776                  */
4777                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id);
4778                 return;
4779         }
4780         abort_flag = 0;
4781         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4782             (offset + sizeof(struct sctp_init_chunk)),
4783             &abort_flag, (struct sctp_chunkhdr *)init_chk);
4784         if (abort_flag) {
4785                 sctp_send_abort(init_pkt, iphlen, sh,
4786                     init_chk->init.initiate_tag, op_err, vrf_id);
4787                 return;
4788         }
4789         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4790         if (m == NULL) {
4791                 /* No memory, INIT timer will re-attempt. */
4792                 if (op_err)
4793                         sctp_m_freem(op_err);
4794                 return;
4795         }
4796         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
4797
4798         /* the time I built cookie */
4799         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
4800
4801         /* populate any tie tags */
4802         if (asoc != NULL) {
4803                 /* unlock before tag selections */
4804                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
4805                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
4806                 stc.cookie_life = asoc->cookie_life;
4807                 net = asoc->primary_destination;
4808         } else {
4809                 stc.tie_tag_my_vtag = 0;
4810                 stc.tie_tag_peer_vtag = 0;
4811                 /* life I will award this cookie */
4812                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
4813         }
4814
4815         /* copy in the ports for later check */
4816         stc.myport = sh->dest_port;
4817         stc.peerport = sh->src_port;
4818
4819         /*
4820          * If we wanted to honor cookie life extentions, we would add to
4821          * stc.cookie_life. For now we should NOT honor any extension
4822          */
4823         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
4824         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
4825                 struct inpcb *in_inp;
4826
4827                 /* Its a V6 socket */
4828                 in_inp = (struct inpcb *)inp;
4829                 stc.ipv6_addr_legal = 1;
4830                 /* Now look at the binding flag to see if V4 will be legal */
4831                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
4832                         stc.ipv4_addr_legal = 1;
4833                 } else {
4834                         /* V4 addresses are NOT legal on the association */
4835                         stc.ipv4_addr_legal = 0;
4836                 }
4837         } else {
4838                 /* Its a V4 socket, no - V6 */
4839                 stc.ipv4_addr_legal = 1;
4840                 stc.ipv6_addr_legal = 0;
4841         }
4842
4843 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
4844         stc.ipv4_scope = 1;
4845 #else
4846         stc.ipv4_scope = 0;
4847 #endif
4848         /* now for scope setup */
4849         memset((caddr_t)&store, 0, sizeof(store));
4850         sin = (struct sockaddr_in *)&store;
4851 #ifdef INET6
4852         sin6 = (struct sockaddr_in6 *)&store;
4853 #endif
4854         if (net == NULL) {
4855                 to = (struct sockaddr *)&store;
4856                 iph = mtod(init_pkt, struct ip *);
4857                 switch (iph->ip_v) {
4858                 case IPVERSION:
4859                         {
4860                                 struct sctp_ifa *addr;
4861                                 sctp_route_t iproute;
4862
4863                                 sin->sin_family = AF_INET;
4864                                 sin->sin_len = sizeof(struct sockaddr_in);
4865                                 sin->sin_port = sh->src_port;
4866                                 sin->sin_addr = iph->ip_src;
4867                                 /* lookup address */
4868                                 stc.address[0] = sin->sin_addr.s_addr;
4869                                 stc.address[1] = 0;
4870                                 stc.address[2] = 0;
4871                                 stc.address[3] = 0;
4872                                 stc.addr_type = SCTP_IPV4_ADDRESS;
4873                                 /* local from address */
4874                                 memset(&iproute, 0, sizeof(iproute));
4875                                 ro = &iproute;
4876                                 memcpy(&ro->ro_dst, sin, sizeof(*sin));
4877                                 addr = sctp_source_address_selection(inp, NULL,
4878                                     ro, NULL, 0,
4879                                     vrf_id);
4880                                 if (addr == NULL)
4881                                         return;
4882
4883                                 if (ro->ro_rt) {
4884                                         RTFREE(ro->ro_rt);
4885                                         ro->ro_rt = NULL;
4886                                 }
4887                                 stc.laddress[0] = addr->address.sin.sin_addr.s_addr;
4888                                 stc.laddress[1] = 0;
4889                                 stc.laddress[2] = 0;
4890                                 stc.laddress[3] = 0;
4891                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
4892                                 /* scope_id is only for v6 */
4893                                 stc.scope_id = 0;
4894 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
4895                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
4896                                         stc.ipv4_scope = 1;
4897                                 }
4898 #else
4899                                 stc.ipv4_scope = 1;
4900 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
4901                                 /* Must use the address in this case */
4902                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
4903                                         stc.loopback_scope = 1;
4904                                         stc.ipv4_scope = 1;
4905                                         stc.site_scope = 1;
4906                                         stc.local_scope = 0;
4907                                 }
4908                                 sctp_free_ifa(addr);
4909                                 break;
4910                         }
4911 #ifdef INET6
4912                 case IPV6_VERSION >> 4:
4913                         {
4914                                 struct sctp_ifa *addr;
4915                                 struct route_in6 iproute6;
4916
4917                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
4918                                 sin6->sin6_family = AF_INET6;
4919                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
4920                                 sin6->sin6_port = sh->src_port;
4921                                 sin6->sin6_addr = ip6->ip6_src;
4922                                 /* lookup address */
4923                                 memcpy(&stc.address, &sin6->sin6_addr,
4924                                     sizeof(struct in6_addr));
4925                                 sin6->sin6_scope_id = 0;
4926                                 stc.addr_type = SCTP_IPV6_ADDRESS;
4927                                 stc.scope_id = 0;
4928                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
4929                                         stc.loopback_scope = 1;
4930                                         stc.local_scope = 0;
4931                                         stc.site_scope = 1;
4932                                         stc.ipv4_scope = 1;
4933                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
4934                                         /*
4935                                          * If the new destination is a
4936                                          * LINK_LOCAL we must have common
4937                                          * both site and local scope. Don't
4938                                          * set local scope though since we
4939                                          * must depend on the source to be
4940                                          * added implicitly. We cannot
4941                                          * assure just because we share one
4942                                          * link that all links are common.
4943                                          */
4944                                         stc.local_scope = 0;
4945                                         stc.site_scope = 1;
4946                                         stc.ipv4_scope = 1;
4947                                         /*
4948                                          * we start counting for the private
4949                                          * address stuff at 1. since the
4950                                          * link local we source from won't
4951                                          * show up in our scoped count.
4952                                          */
4953                                         cnt_inits_to = 1;
4954                                         /*
4955                                          * pull out the scope_id from
4956                                          * incoming pkt
4957                                          */
4958                                         /*
4959                                          * FIX ME: does this have scope from
4960                                          * rcvif?
4961                                          */
4962                                         (void)sa6_recoverscope(sin6);
4963
4964                                         sa6_embedscope(sin6, ip6_use_defzone);
4965                                         stc.scope_id = sin6->sin6_scope_id;
4966                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
4967                                         /*
4968                                          * If the new destination is
4969                                          * SITE_LOCAL then we must have site
4970                                          * scope in common.
4971                                          */
4972                                         stc.site_scope = 1;
4973                                 }
4974                                 /* local from address */
4975                                 memset(&iproute6, 0, sizeof(iproute6));
4976                                 ro = (sctp_route_t *) & iproute6;
4977                                 memcpy(&ro->ro_dst, sin6, sizeof(*sin6));
4978                                 addr = sctp_source_address_selection(inp, NULL,
4979                                     ro, NULL, 0, vrf_id);
4980                                 if (addr == NULL)
4981                                         return;
4982
4983                                 if (ro->ro_rt) {
4984                                         RTFREE(ro->ro_rt);
4985                                         ro->ro_rt = NULL;
4986                                 }
4987                                 memcpy(&stc.laddress, &addr->address.sin6.sin6_addr, sizeof(struct in6_addr));
4988                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
4989                                 sctp_free_ifa(addr);
4990                                 break;
4991                         }
4992 #endif
4993                 default:
4994                         /* TSNH */
4995                         break;
4996                 }
4997         } else {
4998                 /* set the scope per the existing tcb */
4999
5000 #ifdef INET6
5001                 struct sctp_nets *lnet;
5002
5003 #endif
5004
5005                 stc.loopback_scope = asoc->loopback_scope;
5006                 stc.ipv4_scope = asoc->ipv4_local_scope;
5007                 stc.site_scope = asoc->site_scope;
5008                 stc.local_scope = asoc->local_scope;
5009 #ifdef INET6
5010                 /* Why do we not consider IPv4 LL addresses? */
5011                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5012                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5013                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5014                                         /*
5015                                          * if we have a LL address, start
5016                                          * counting at 1.
5017                                          */
5018                                         cnt_inits_to = 1;
5019                                 }
5020                         }
5021                 }
5022 #endif
5023                 /* use the net pointer */
5024                 to = (struct sockaddr *)&net->ro._l_addr;
5025                 switch (to->sa_family) {
5026                 case AF_INET:
5027                         sin = (struct sockaddr_in *)to;
5028                         stc.address[0] = sin->sin_addr.s_addr;
5029                         stc.address[1] = 0;
5030                         stc.address[2] = 0;
5031                         stc.address[3] = 0;
5032                         stc.addr_type = SCTP_IPV4_ADDRESS;
5033                         if (net->src_addr_selected == 0) {
5034                                 /*
5035                                  * strange case here, the INIT should have
5036                                  * did the selection.
5037                                  */
5038                                 net->ro._s_addr = sctp_source_address_selection(inp,
5039                                     stcb, (sctp_route_t *) & net->ro,
5040                                     net, 0, vrf_id);
5041                                 if (net->ro._s_addr == NULL)
5042                                         return;
5043
5044                                 net->src_addr_selected = 1;
5045
5046                         }
5047                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5048                         stc.laddress[1] = 0;
5049                         stc.laddress[2] = 0;
5050                         stc.laddress[3] = 0;
5051                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5052                         break;
5053 #ifdef INET6
5054                 case AF_INET6:
5055                         sin6 = (struct sockaddr_in6 *)to;
5056                         memcpy(&stc.address, &sin6->sin6_addr,
5057                             sizeof(struct in6_addr));
5058                         stc.addr_type = SCTP_IPV6_ADDRESS;
5059                         if (net->src_addr_selected == 0) {
5060                                 /*
5061                                  * strange case here, the INIT should have
5062                                  * did the selection.
5063                                  */
5064                                 net->ro._s_addr = sctp_source_address_selection(inp,
5065                                     stcb, (sctp_route_t *) & net->ro,
5066                                     net, 0, vrf_id);
5067                                 if (net->ro._s_addr == NULL)
5068                                         return;
5069
5070                                 net->src_addr_selected = 1;
5071                         }
5072                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5073                             sizeof(struct in6_addr));
5074                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5075                         break;
5076 #endif
5077                 }
5078         }
5079         /* Now lets put the SCTP header in place */
5080         initackm_out = mtod(m, struct sctp_init_msg *);
5081         initackm_out->sh.src_port = inp->sctp_lport;
5082         initackm_out->sh.dest_port = sh->src_port;
5083         initackm_out->sh.v_tag = init_chk->init.initiate_tag;
5084         /* Save it off for quick ref */
5085         stc.peers_vtag = init_chk->init.initiate_tag;
5086         initackm_out->sh.checksum = 0;  /* calculate later */
5087         /* who are we */
5088         memcpy(stc.identification, SCTP_VERSION_STRING,
5089             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5090         /* now the chunk header */
5091         initackm_out->msg.ch.chunk_type = SCTP_INITIATION_ACK;
5092         initackm_out->msg.ch.chunk_flags = 0;
5093         /* fill in later from mbuf we build */
5094         initackm_out->msg.ch.chunk_length = 0;
5095         /* place in my tag */
5096         if ((asoc != NULL) &&
5097             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5098             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5099             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5100                 /* re-use the v-tags and init-seq here */
5101                 initackm_out->msg.init.initiate_tag = htonl(asoc->my_vtag);
5102                 initackm_out->msg.init.initial_tsn = htonl(asoc->init_seq_number);
5103         } else {
5104                 uint32_t vtag, itsn;
5105
5106                 if (hold_inp_lock) {
5107                         SCTP_INP_INCR_REF(inp);
5108                         SCTP_INP_RUNLOCK(inp);
5109                 }
5110                 if (asoc) {
5111                         atomic_add_int(&asoc->refcnt, 1);
5112                         SCTP_TCB_UNLOCK(stcb);
5113                         vtag = sctp_select_a_tag(inp, 1);
5114                         initackm_out->msg.init.initiate_tag = htonl(vtag);
5115                         /* get a TSN to use too */
5116                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5117                         initackm_out->msg.init.initial_tsn = htonl(itsn);
5118                         SCTP_TCB_LOCK(stcb);
5119                         atomic_add_int(&asoc->refcnt, -1);
5120                 } else {
5121                         vtag = sctp_select_a_tag(inp, 1);
5122                         initackm_out->msg.init.initiate_tag = htonl(vtag);
5123                         /* get a TSN to use too */
5124                         initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5125                 }
5126                 if (hold_inp_lock) {
5127                         SCTP_INP_RLOCK(inp);
5128                         SCTP_INP_DECR_REF(inp);
5129                 }
5130         }
5131         /* save away my tag to */
5132         stc.my_vtag = initackm_out->msg.init.initiate_tag;
5133
5134         /* set up some of the credits. */
5135         so = inp->sctp_socket;
5136         if (so == NULL) {
5137                 /* memory problem */
5138                 sctp_m_freem(m);
5139                 return;
5140         } else {
5141                 initackm_out->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5142         }
5143         /* set what I want */
5144         his_limit = ntohs(init_chk->init.num_inbound_streams);
5145         /* choose what I want */
5146         if (asoc != NULL) {
5147                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5148                         i_want = asoc->streamoutcnt;
5149                 } else {
5150                         i_want = inp->sctp_ep.pre_open_stream_count;
5151                 }
5152         } else {
5153                 i_want = inp->sctp_ep.pre_open_stream_count;
5154         }
5155         if (his_limit < i_want) {
5156                 /* I Want more :< */
5157                 initackm_out->msg.init.num_outbound_streams = init_chk->init.num_inbound_streams;
5158         } else {
5159                 /* I can have what I want :> */
5160                 initackm_out->msg.init.num_outbound_streams = htons(i_want);
5161         }
5162         /* tell him his limt. */
5163         initackm_out->msg.init.num_inbound_streams =
5164             htons(inp->sctp_ep.max_open_streams_intome);
5165         /* setup the ECN pointer */
5166
5167         if (inp->sctp_ep.adaptation_layer_indicator) {
5168                 struct sctp_adaptation_layer_indication *ali;
5169
5170                 ali = (struct sctp_adaptation_layer_indication *)(
5171                     (caddr_t)initackm_out + sizeof(*initackm_out));
5172                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5173                 ali->ph.param_length = htons(sizeof(*ali));
5174                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5175                 SCTP_BUF_LEN(m) += sizeof(*ali);
5176                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
5177                     sizeof(*ali));
5178         } else {
5179                 ecn = (struct sctp_ecn_supported_param *)(
5180                     (caddr_t)initackm_out + sizeof(*initackm_out));
5181         }
5182
5183         /* ECN parameter */
5184         if (sctp_ecn_enable == 1) {
5185                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5186                 ecn->ph.param_length = htons(sizeof(*ecn));
5187                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5188
5189                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5190                     sizeof(*ecn));
5191         } else {
5192                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5193         }
5194         /* And now tell the peer we do  pr-sctp */
5195         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5196         prsctp->ph.param_length = htons(sizeof(*prsctp));
5197         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5198
5199         /* And now tell the peer we do all the extensions */
5200         pr_supported = (struct sctp_supported_chunk_types_param *)
5201             ((caddr_t)prsctp + sizeof(*prsctp));
5202
5203         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5204         num_ext = 0;
5205         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5206         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5207         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5208         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5209         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5210         if (!sctp_auth_disable)
5211                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5212         p_len = sizeof(*pr_supported) + num_ext;
5213         pr_supported->ph.param_length = htons(p_len);
5214         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5215         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5216
5217         /* ECN nonce: And now tell the peer we support ECN nonce */
5218         if (sctp_ecn_nonce) {
5219                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5220                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5221                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5222                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5223                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5224         }
5225         /* add authentication parameters */
5226         if (!sctp_auth_disable) {
5227                 struct sctp_auth_random *randp;
5228                 struct sctp_auth_hmac_algo *hmacs;
5229                 struct sctp_auth_chunk_list *chunks;
5230                 uint16_t random_len;
5231
5232                 /* generate and add RANDOM parameter */
5233                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5234                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5235                 randp->ph.param_type = htons(SCTP_RANDOM);
5236                 p_len = sizeof(*randp) + random_len;
5237                 randp->ph.param_length = htons(p_len);
5238                 SCTP_READ_RANDOM(randp->random_data, random_len);
5239                 /* zero out any padding required */
5240                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5241                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5242
5243                 /* add HMAC_ALGO parameter */
5244                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5245                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5246                     (uint8_t *) hmacs->hmac_ids);
5247                 if (p_len > 0) {
5248                         p_len += sizeof(*hmacs);
5249                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5250                         hmacs->ph.param_length = htons(p_len);
5251                         /* zero out any padding required */
5252                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5253                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5254                 }
5255                 /* add CHUNKS parameter */
5256                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5257                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5258                     chunks->chunk_types);
5259                 if (p_len > 0) {
5260                         p_len += sizeof(*chunks);
5261                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5262                         chunks->ph.param_length = htons(p_len);
5263                         /* zero out any padding required */
5264                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5265                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5266                 }
5267         }
5268         m_at = m;
5269         /* now the addresses */
5270         {
5271                 struct sctp_scoping scp;
5272
5273                 /*
5274                  * To optimize this we could put the scoping stuff into a
5275                  * structure and remove the individual uint8's from the stc
5276                  * structure. Then we could just sifa in the address within
5277                  * the stc.. but for now this is a quick hack to get the
5278                  * address stuff teased apart.
5279                  */
5280                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5281                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5282                 scp.loopback_scope = stc.loopback_scope;
5283                 scp.ipv4_local_scope = stc.ipv4_scope;
5284                 scp.local_scope = stc.local_scope;
5285                 scp.site_scope = stc.site_scope;
5286                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5287         }
5288
5289         /* tack on the operational error if present */
5290         if (op_err) {
5291                 struct mbuf *ol;
5292                 int llen;
5293
5294                 llen = 0;
5295                 ol = op_err;
5296                 while (ol) {
5297                         llen += SCTP_BUF_LEN(ol);
5298                         ol = SCTP_BUF_NEXT(ol);
5299                 }
5300                 if (llen % 4) {
5301                         /* must add a pad to the param */
5302                         uint32_t cpthis = 0;
5303                         int padlen;
5304
5305                         padlen = 4 - (llen % 4);
5306                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5307                 }
5308                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5309                         m_at = SCTP_BUF_NEXT(m_at);
5310                 }
5311                 SCTP_BUF_NEXT(m_at) = op_err;
5312                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5313                         m_at = SCTP_BUF_NEXT(m_at);
5314                 }
5315         }
5316         /* pre-calulate the size and update pkt header and chunk header */
5317         p_len = 0;
5318         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5319                 p_len += SCTP_BUF_LEN(m_tmp);
5320                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5321                         /* m_tmp should now point to last one */
5322                         break;
5323                 }
5324         }
5325
5326         /* Now we must build a cookie */
5327         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m,
5328             sizeof(struct sctphdr), &stc, &signature);
5329         if (m_cookie == NULL) {
5330                 /* memory problem */
5331                 sctp_m_freem(m);
5332                 return;
5333         }
5334         /* Now append the cookie to the end and update the space/size */
5335         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5336
5337         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5338                 p_len += SCTP_BUF_LEN(m_tmp);
5339                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5340                         /* m_tmp should now point to last one */
5341                         mp_last = m_tmp;
5342                         break;
5343                 }
5344         }
5345         /*
5346          * Place in the size, but we don't include the last pad (if any) in
5347          * the INIT-ACK.
5348          */
5349         initackm_out->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
5350
5351         /*
5352          * Time to sign the cookie, we don't sign over the cookie signature
5353          * though thus we set trailer.
5354          */
5355         (void)sctp_hmac_m(SCTP_HMAC,
5356             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5357             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5358             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5359         /*
5360          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5361          * here since the timer will drive a retranmission.
5362          */
5363         padval = p_len % 4;
5364         if ((padval) && (mp_last)) {
5365                 /* see my previous comments on mp_last */
5366                 int ret;
5367
5368                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5369                 if (ret) {
5370                         /* Houston we have a problem, no space */
5371                         sctp_m_freem(m);
5372                         return;
5373                 }
5374                 p_len += padval;
5375         }
5376         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5377             NULL, 0, SCTP_SO_NOT_LOCKED);
5378         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5379 }
5380
5381
5382 void
5383 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5384     struct sctp_association *asoc,
5385     struct sctp_stream_out *strq, int holds_lock)
5386 {
5387         struct sctp_stream_out *stre, *strn;
5388
5389         if (holds_lock == 0) {
5390                 SCTP_TCB_SEND_LOCK(stcb);
5391         }
5392         if ((strq->next_spoke.tqe_next) ||
5393             (strq->next_spoke.tqe_prev)) {
5394                 /* already on wheel */
5395                 goto outof_here;
5396         }
5397         stre = TAILQ_FIRST(&asoc->out_wheel);
5398         if (stre == NULL) {
5399                 /* only one on wheel */
5400                 TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
5401                 goto outof_here;
5402         }
5403         for (; stre; stre = strn) {
5404                 strn = TAILQ_NEXT(stre, next_spoke);
5405                 if (stre->stream_no > strq->stream_no) {
5406                         TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
5407                         goto outof_here;
5408                 } else if (stre->stream_no == strq->stream_no) {
5409                         /* huh, should not happen */
5410                         goto outof_here;
5411                 } else if (strn == NULL) {
5412                         /* next one is null */
5413                         TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
5414                             next_spoke);
5415                 }
5416         }
5417 outof_here:
5418         if (holds_lock == 0) {
5419                 SCTP_TCB_SEND_UNLOCK(stcb);
5420         }
5421 }
5422
5423 static void
5424 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5425     struct sctp_association *asoc,
5426     struct sctp_stream_out *strq)
5427 {
5428         /* take off and then setup so we know it is not on the wheel */
5429         SCTP_TCB_SEND_LOCK(stcb);
5430         if (TAILQ_FIRST(&strq->outqueue)) {
5431                 /* more was added */
5432                 SCTP_TCB_SEND_UNLOCK(stcb);
5433                 return;
5434         }
5435         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5436         strq->next_spoke.tqe_next = NULL;
5437         strq->next_spoke.tqe_prev = NULL;
5438         SCTP_TCB_SEND_UNLOCK(stcb);
5439 }
5440
5441 static void
5442 sctp_prune_prsctp(struct sctp_tcb *stcb,
5443     struct sctp_association *asoc,
5444     struct sctp_sndrcvinfo *srcv,
5445     int dataout)
5446 {
5447         int freed_spc = 0;
5448         struct sctp_tmit_chunk *chk, *nchk;
5449
5450         SCTP_TCB_LOCK_ASSERT(stcb);
5451         if ((asoc->peer_supports_prsctp) &&
5452             (asoc->sent_queue_cnt_removeable > 0)) {
5453                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5454                         /*
5455                          * Look for chunks marked with the PR_SCTP flag AND
5456                          * the buffer space flag. If the one being sent is
5457                          * equal or greater priority then purge the old one
5458                          * and free some space.
5459                          */
5460                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5461                                 /*
5462                                  * This one is PR-SCTP AND buffer space
5463                                  * limited type
5464                                  */
5465                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5466                                         /*
5467                                          * Lower numbers equates to higher
5468                                          * priority so if the one we are
5469                                          * looking at has a larger or equal
5470                                          * priority we want to drop the data
5471                                          * and NOT retransmit it.
5472                                          */
5473                                         if (chk->data) {
5474                                                 /*
5475                                                  * We release the book_size
5476                                                  * if the mbuf is here
5477                                                  */
5478                                                 int ret_spc;
5479                                                 int cause;
5480
5481                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5482                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5483                                                 else
5484                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5485                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5486                                                     cause,
5487                                                     &asoc->sent_queue, SCTP_SO_LOCKED);
5488                                                 freed_spc += ret_spc;
5489                                                 if (freed_spc >= dataout) {
5490                                                         return;
5491                                                 }
5492                                         }       /* if chunk was present */
5493                                 }       /* if of sufficent priority */
5494                         }       /* if chunk has enabled */
5495                 }               /* tailqforeach */
5496
5497                 chk = TAILQ_FIRST(&asoc->send_queue);
5498                 while (chk) {
5499                         nchk = TAILQ_NEXT(chk, sctp_next);
5500                         /* Here we must move to the sent queue and mark */
5501                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5502                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5503                                         if (chk->data) {
5504                                                 /*
5505                                                  * We release the book_size
5506                                                  * if the mbuf is here
5507                                                  */
5508                                                 int ret_spc;
5509
5510                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5511                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5512                                                     &asoc->send_queue, SCTP_SO_LOCKED);
5513
5514                                                 freed_spc += ret_spc;
5515                                                 if (freed_spc >= dataout) {
5516                                                         return;
5517                                                 }
5518                                         }       /* end if chk->data */
5519                                 }       /* end if right class */
5520                         }       /* end if chk pr-sctp */
5521                         chk = nchk;
5522                 }               /* end while (chk) */
5523         }                       /* if enabled in asoc */
5524 }
5525
5526 int
5527 sctp_get_frag_point(struct sctp_tcb *stcb,
5528     struct sctp_association *asoc)
5529 {
5530         int siz, ovh;
5531
5532         /*
5533          * For endpoints that have both v6 and v4 addresses we must reserve
5534          * room for the ipv6 header, for those that are only dealing with V4
5535          * we use a larger frag point.
5536          */
5537         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5538                 ovh = SCTP_MED_OVERHEAD;
5539         } else {
5540                 ovh = SCTP_MED_V4_OVERHEAD;
5541         }
5542
5543         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5544                 siz = asoc->smallest_mtu - ovh;
5545         else
5546                 siz = (stcb->asoc.sctp_frag_point - ovh);
5547         /*
5548          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5549          */
5550         /* A data chunk MUST fit in a cluster */
5551         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5552         /* } */
5553
5554         /* adjust for an AUTH chunk if DATA requires auth */
5555         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5556                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5557
5558         if (siz % 4) {
5559                 /* make it an even word boundary please */
5560                 siz -= (siz % 4);
5561         }
5562         return (siz);
5563 }
5564
5565 static void
5566 sctp_set_prsctp_policy(struct sctp_tcb *stcb,
5567     struct sctp_stream_queue_pending *sp)
5568 {
5569         sp->pr_sctp_on = 0;
5570         if (stcb->asoc.peer_supports_prsctp) {
5571                 /*
5572                  * We assume that the user wants PR_SCTP_TTL if the user
5573                  * provides a positive lifetime but does not specify any
5574                  * PR_SCTP policy. This is a BAD assumption and causes
5575                  * problems at least with the U-Vancovers MPI folks. I will
5576                  * change this to be no policy means NO PR-SCTP.
5577                  */
5578                 if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5579                         sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5580                         sp->pr_sctp_on = 1;
5581                 } else {
5582                         return;
5583                 }
5584                 switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5585                 case CHUNK_FLAGS_PR_SCTP_BUF:
5586                         /*
5587                          * Time to live is a priority stored in tv_sec when
5588                          * doing the buffer drop thing.
5589                          */
5590                         sp->ts.tv_sec = sp->timetolive;
5591                         sp->ts.tv_usec = 0;
5592                         break;
5593                 case CHUNK_FLAGS_PR_SCTP_TTL:
5594                         {
5595                                 struct timeval tv;
5596
5597                                 (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5598                                 tv.tv_sec = sp->timetolive / 1000;
5599                                 tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5600                                 timevaladd(&sp->ts, &tv);
5601                         }
5602                         break;
5603                 case CHUNK_FLAGS_PR_SCTP_RTX:
5604                         /*
5605                          * Time to live is a the number or retransmissions
5606                          * stored in tv_sec.
5607                          */
5608                         sp->ts.tv_sec = sp->timetolive;
5609                         sp->ts.tv_usec = 0;
5610                         break;
5611                 default:
5612                         SCTPDBG(SCTP_DEBUG_USRREQ1,
5613                             "Unknown PR_SCTP policy %u.\n",
5614                             PR_SCTP_POLICY(sp->sinfo_flags));
5615                         break;
5616                 }
5617         }
5618 }
5619
5620 static int
5621 sctp_msg_append(struct sctp_tcb *stcb,
5622     struct sctp_nets *net,
5623     struct mbuf *m,
5624     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5625 {
5626         int error = 0, holds_lock;
5627         struct mbuf *at;
5628         struct sctp_stream_queue_pending *sp = NULL;
5629         struct sctp_stream_out *strm;
5630
5631         /*
5632          * Given an mbuf chain, put it into the association send queue and
5633          * place it on the wheel
5634          */
5635         holds_lock = hold_stcb_lock;
5636         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5637                 /* Invalid stream number */
5638                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5639                 error = EINVAL;
5640                 goto out_now;
5641         }
5642         if ((stcb->asoc.stream_locked) &&
5643             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5644                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5645                 error = EINVAL;
5646                 goto out_now;
5647         }
5648         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5649         /* Now can we send this? */
5650         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5651             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5652             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5653             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5654                 /* got data while shutting down */
5655                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5656                 error = ECONNRESET;
5657                 goto out_now;
5658         }
5659         sctp_alloc_a_strmoq(stcb, sp);
5660         if (sp == NULL) {
5661                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5662                 error = ENOMEM;
5663                 goto out_now;
5664         }
5665         sp->sinfo_flags = srcv->sinfo_flags;
5666         sp->timetolive = srcv->sinfo_timetolive;
5667         sp->ppid = srcv->sinfo_ppid;
5668         sp->context = srcv->sinfo_context;
5669         sp->strseq = 0;
5670         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5671                 sp->net = net;
5672                 sp->addr_over = 1;
5673         } else {
5674                 sp->net = stcb->asoc.primary_destination;
5675                 sp->addr_over = 0;
5676         }
5677         atomic_add_int(&sp->net->ref_count, 1);
5678         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5679         sp->stream = srcv->sinfo_stream;
5680         sp->msg_is_complete = 1;
5681         sp->sender_all_done = 1;
5682         sp->some_taken = 0;
5683         sp->data = m;
5684         sp->tail_mbuf = NULL;
5685         sp->length = 0;
5686         at = m;
5687         sctp_set_prsctp_policy(stcb, sp);
5688         /*
5689          * We could in theory (for sendall) sifa the length in, but we would
5690          * still have to hunt through the chain since we need to setup the
5691          * tail_mbuf
5692          */
5693         while (at) {
5694                 if (SCTP_BUF_NEXT(at) == NULL)
5695                         sp->tail_mbuf = at;
5696                 sp->length += SCTP_BUF_LEN(at);
5697                 at = SCTP_BUF_NEXT(at);
5698         }
5699         SCTP_TCB_SEND_LOCK(stcb);
5700         sctp_snd_sb_alloc(stcb, sp->length);
5701         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5702         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5703         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5704                 sp->strseq = strm->next_sequence_sent;
5705                 strm->next_sequence_sent++;
5706         }
5707         if ((strm->next_spoke.tqe_next == NULL) &&
5708             (strm->next_spoke.tqe_prev == NULL)) {
5709                 /* Not on wheel, insert */
5710                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5711         }
5712         m = NULL;
5713         SCTP_TCB_SEND_UNLOCK(stcb);
5714 out_now:
5715         if (m) {
5716                 sctp_m_freem(m);
5717         }
5718         return (error);
5719 }
5720
5721
5722 static struct mbuf *
5723 sctp_copy_mbufchain(struct mbuf *clonechain,
5724     struct mbuf *outchain,
5725     struct mbuf **endofchain,
5726     int can_take_mbuf,
5727     int sizeofcpy,
5728     uint8_t copy_by_ref)
5729 {
5730         struct mbuf *m;
5731         struct mbuf *appendchain;
5732         caddr_t cp;
5733         int len;
5734
5735         if (endofchain == NULL) {
5736                 /* error */
5737 error_out:
5738                 if (outchain)
5739                         sctp_m_freem(outchain);
5740                 return (NULL);
5741         }
5742         if (can_take_mbuf) {
5743                 appendchain = clonechain;
5744         } else {
5745                 if (!copy_by_ref &&
5746                     (sizeofcpy <= (int)((((sctp_mbuf_threshold_count - 1) * MLEN) + MHLEN)))
5747                     ) {
5748                         /* Its not in a cluster */
5749                         if (*endofchain == NULL) {
5750                                 /* lets get a mbuf cluster */
5751                                 if (outchain == NULL) {
5752                                         /* This is the general case */
5753                         new_mbuf:
5754                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5755                                         if (outchain == NULL) {
5756                                                 goto error_out;
5757                                         }
5758                                         SCTP_BUF_LEN(outchain) = 0;
5759                                         *endofchain = outchain;
5760                                         /* get the prepend space */
5761                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5762                                 } else {
5763                                         /*
5764                                          * We really should not get a NULL
5765                                          * in endofchain
5766                                          */
5767                                         /* find end */
5768                                         m = outchain;
5769                                         while (m) {
5770                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5771                                                         *endofchain = m;
5772                                                         break;
5773                                                 }
5774                                                 m = SCTP_BUF_NEXT(m);
5775                                         }
5776                                         /* sanity */
5777                                         if (*endofchain == NULL) {
5778                                                 /*
5779                                                  * huh, TSNH XXX maybe we
5780                                                  * should panic
5781                                                  */
5782                                                 sctp_m_freem(outchain);
5783                                                 goto new_mbuf;
5784                                         }
5785                                 }
5786                                 /* get the new end of length */
5787                                 len = M_TRAILINGSPACE(*endofchain);
5788                         } else {
5789                                 /* how much is left at the end? */
5790                                 len = M_TRAILINGSPACE(*endofchain);
5791                         }
5792                         /* Find the end of the data, for appending */
5793                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5794
5795                         /* Now lets copy it out */
5796                         if (len >= sizeofcpy) {
5797                                 /* It all fits, copy it in */
5798                                 m_copydata(clonechain, 0, sizeofcpy, cp);
5799                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5800                         } else {
5801                                 /* fill up the end of the chain */
5802                                 if (len > 0) {
5803                                         m_copydata(clonechain, 0, len, cp);
5804                                         SCTP_BUF_LEN((*endofchain)) += len;
5805                                         /* now we need another one */
5806                                         sizeofcpy -= len;
5807                                 }
5808                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5809                                 if (m == NULL) {
5810                                         /* We failed */
5811                                         goto error_out;
5812                                 }
5813                                 SCTP_BUF_NEXT((*endofchain)) = m;
5814                                 *endofchain = m;
5815                                 cp = mtod((*endofchain), caddr_t);
5816                                 m_copydata(clonechain, len, sizeofcpy, cp);
5817                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5818                         }
5819                         return (outchain);
5820                 } else {
5821                         /* copy the old fashion way */
5822                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
5823 #ifdef SCTP_MBUF_LOGGING
5824                         if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
5825                                 struct mbuf *mat;
5826
5827                                 mat = appendchain;
5828                                 while (mat) {
5829                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5830                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5831                                         }
5832                                         mat = SCTP_BUF_NEXT(mat);
5833                                 }
5834                         }
5835 #endif
5836                 }
5837         }
5838         if (appendchain == NULL) {
5839                 /* error */
5840                 if (outchain)
5841                         sctp_m_freem(outchain);
5842                 return (NULL);
5843         }
5844         if (outchain) {
5845                 /* tack on to the end */
5846                 if (*endofchain != NULL) {
5847                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
5848                 } else {
5849                         m = outchain;
5850                         while (m) {
5851                                 if (SCTP_BUF_NEXT(m) == NULL) {
5852                                         SCTP_BUF_NEXT(m) = appendchain;
5853                                         break;
5854                                 }
5855                                 m = SCTP_BUF_NEXT(m);
5856                         }
5857                 }
5858                 /*
5859                  * save off the end and update the end-chain postion
5860                  */
5861                 m = appendchain;
5862                 while (m) {
5863                         if (SCTP_BUF_NEXT(m) == NULL) {
5864                                 *endofchain = m;
5865                                 break;
5866                         }
5867                         m = SCTP_BUF_NEXT(m);
5868                 }
5869                 return (outchain);
5870         } else {
5871                 /* save off the end and update the end-chain postion */
5872                 m = appendchain;
5873                 while (m) {
5874                         if (SCTP_BUF_NEXT(m) == NULL) {
5875                                 *endofchain = m;
5876                                 break;
5877                         }
5878                         m = SCTP_BUF_NEXT(m);
5879                 }
5880                 return (appendchain);
5881         }
5882 }
5883
5884 int
5885 sctp_med_chunk_output(struct sctp_inpcb *inp,
5886     struct sctp_tcb *stcb,
5887     struct sctp_association *asoc,
5888     int *num_out,
5889     int *reason_code,
5890     int control_only, int *cwnd_full, int from_where,
5891     struct timeval *now, int *now_filled, int frag_point, int so_locked
5892 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
5893     SCTP_UNUSED
5894 #endif
5895 );
5896
5897 static void
5898 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
5899     uint32_t val)
5900 {
5901         struct sctp_copy_all *ca;
5902         struct mbuf *m;
5903         int ret = 0;
5904         int added_control = 0;
5905         int un_sent, do_chunk_output = 1;
5906         struct sctp_association *asoc;
5907
5908         ca = (struct sctp_copy_all *)ptr;
5909         if (ca->m == NULL) {
5910                 return;
5911         }
5912         if (ca->inp != inp) {
5913                 /* TSNH */
5914                 return;
5915         }
5916         if ((ca->m) && ca->sndlen) {
5917                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
5918                 if (m == NULL) {
5919                         /* can't copy so we are done */
5920                         ca->cnt_failed++;
5921                         return;
5922                 }
5923 #ifdef SCTP_MBUF_LOGGING
5924                 if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
5925                         struct mbuf *mat;
5926
5927                         mat = m;
5928                         while (mat) {
5929                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
5930                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5931                                 }
5932                                 mat = SCTP_BUF_NEXT(mat);
5933                         }
5934                 }
5935 #endif
5936         } else {
5937                 m = NULL;
5938         }
5939         SCTP_TCB_LOCK_ASSERT(stcb);
5940         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
5941                 /* Abort this assoc with m as the user defined reason */
5942                 if (m) {
5943                         struct sctp_paramhdr *ph;
5944
5945                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
5946                         if (m) {
5947                                 ph = mtod(m, struct sctp_paramhdr *);
5948                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
5949                                 ph->param_length = htons(ca->sndlen);
5950                         }
5951                         /*
5952                          * We add one here to keep the assoc from
5953                          * dis-appearing on us.
5954                          */
5955                         atomic_add_int(&stcb->asoc.refcnt, 1);
5956                         sctp_abort_an_association(inp, stcb,
5957                             SCTP_RESPONSE_TO_USER_REQ,
5958                             m, SCTP_SO_NOT_LOCKED);
5959                         /*
5960                          * sctp_abort_an_association calls sctp_free_asoc()
5961                          * free association will NOT free it since we
5962                          * incremented the refcnt .. we do this to prevent
5963                          * it being freed and things getting tricky since we
5964                          * could end up (from free_asoc) calling inpcb_free
5965                          * which would get a recursive lock call to the
5966                          * iterator lock.. But as a consequence of that the
5967                          * stcb will return to us un-locked.. since
5968                          * free_asoc returns with either no TCB or the TCB
5969                          * unlocked, we must relock.. to unlock in the
5970                          * iterator timer :-0
5971                          */
5972                         SCTP_TCB_LOCK(stcb);
5973                         atomic_add_int(&stcb->asoc.refcnt, -1);
5974                         goto no_chunk_output;
5975                 }
5976         } else {
5977                 if (m) {
5978                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
5979                             &ca->sndrcv, 1);
5980                 }
5981                 asoc = &stcb->asoc;
5982                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
5983                         /* shutdown this assoc */
5984                         int cnt;
5985
5986                         cnt = sctp_is_there_unsent_data(stcb);
5987
5988                         if (TAILQ_EMPTY(&asoc->send_queue) &&
5989                             TAILQ_EMPTY(&asoc->sent_queue) &&
5990                             (cnt == 0)) {
5991                                 if (asoc->locked_on_sending) {
5992                                         goto abort_anyway;
5993                                 }
5994                                 /*
5995                                  * there is nothing queued to send, so I'm
5996                                  * done...
5997                                  */
5998                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
5999                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6000                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6001                                         /*
6002                                          * only send SHUTDOWN the first time
6003                                          * through
6004                                          */
6005                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6006                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6007                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6008                                         }
6009                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6010                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6011                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6012                                             asoc->primary_destination);
6013                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6014                                             asoc->primary_destination);
6015                                         added_control = 1;
6016                                         do_chunk_output = 0;
6017                                 }
6018                         } else {
6019                                 /*
6020                                  * we still got (or just got) data to send,
6021                                  * so set SHUTDOWN_PENDING
6022                                  */
6023                                 /*
6024                                  * XXX sockets draft says that SCTP_EOF
6025                                  * should be sent with no data.  currently,
6026                                  * we will allow user data to be sent first
6027                                  * and move to SHUTDOWN-PENDING
6028                                  */
6029                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6030                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6031                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6032                                         if (asoc->locked_on_sending) {
6033                                                 /*
6034                                                  * Locked to send out the
6035                                                  * data
6036                                                  */
6037                                                 struct sctp_stream_queue_pending *sp;
6038
6039                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6040                                                 if (sp) {
6041                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6042                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6043                                                 }
6044                                         }
6045                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6046                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6047                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6048                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6049                                 abort_anyway:
6050                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6051                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6052                                                     SCTP_RESPONSE_TO_USER_REQ,
6053                                                     NULL, SCTP_SO_NOT_LOCKED);
6054                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6055                                                 goto no_chunk_output;
6056                                         }
6057                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6058                                             asoc->primary_destination);
6059                                 }
6060                         }
6061
6062                 }
6063         }
6064         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6065             ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
6066
6067         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6068             (stcb->asoc.total_flight > 0) &&
6069             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6070             ) {
6071                 do_chunk_output = 0;
6072         }
6073         if (do_chunk_output)
6074                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6075         else if (added_control) {
6076                 int num_out = 0, reason = 0, cwnd_full = 0, now_filled = 0;
6077                 struct timeval now;
6078                 int frag_point;
6079
6080                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6081                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6082                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6083         }
6084 no_chunk_output:
6085         if (ret) {
6086                 ca->cnt_failed++;
6087         } else {
6088                 ca->cnt_sent++;
6089         }
6090 }
6091
6092 static void
6093 sctp_sendall_completes(void *ptr, uint32_t val)
6094 {
6095         struct sctp_copy_all *ca;
6096
6097         ca = (struct sctp_copy_all *)ptr;
6098         /*
6099          * Do a notify here? Kacheong suggests that the notify be done at
6100          * the send time.. so you would push up a notification if any send
6101          * failed. Don't know if this is feasable since the only failures we
6102          * have is "memory" related and if you cannot get an mbuf to send
6103          * the data you surely can't get an mbuf to send up to notify the
6104          * user you can't send the data :->
6105          */
6106
6107         /* now free everything */
6108         sctp_m_freem(ca->m);
6109         SCTP_FREE(ca, SCTP_M_COPYAL);
6110 }
6111
6112
6113 #define MC_ALIGN(m, len) do {                                           \
6114         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6115 } while (0)
6116
6117
6118
6119 static struct mbuf *
6120 sctp_copy_out_all(struct uio *uio, int len)
6121 {
6122         struct mbuf *ret, *at;
6123         int left, willcpy, cancpy, error;
6124
6125         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6126         if (ret == NULL) {
6127                 /* TSNH */
6128                 return (NULL);
6129         }
6130         left = len;
6131         SCTP_BUF_LEN(ret) = 0;
6132         /* save space for the data chunk header */
6133         cancpy = M_TRAILINGSPACE(ret);
6134         willcpy = min(cancpy, left);
6135         at = ret;
6136         while (left > 0) {
6137                 /* Align data to the end */
6138                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6139                 if (error) {
6140         err_out_now:
6141                         sctp_m_freem(at);
6142                         return (NULL);
6143                 }
6144                 SCTP_BUF_LEN(at) = willcpy;
6145                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6146                 left -= willcpy;
6147                 if (left > 0) {
6148                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6149                         if (SCTP_BUF_NEXT(at) == NULL) {
6150                                 goto err_out_now;
6151                         }
6152                         at = SCTP_BUF_NEXT(at);
6153                         SCTP_BUF_LEN(at) = 0;
6154                         cancpy = M_TRAILINGSPACE(at);
6155                         willcpy = min(cancpy, left);
6156                 }
6157         }
6158         return (ret);
6159 }
6160
6161 static int
6162 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6163     struct sctp_sndrcvinfo *srcv)
6164 {
6165         int ret;
6166         struct sctp_copy_all *ca;
6167
6168         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6169             SCTP_M_COPYAL);
6170         if (ca == NULL) {
6171                 sctp_m_freem(m);
6172                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6173                 return (ENOMEM);
6174         }
6175         memset(ca, 0, sizeof(struct sctp_copy_all));
6176
6177         ca->inp = inp;
6178         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6179         /*
6180          * take off the sendall flag, it would be bad if we failed to do
6181          * this :-0
6182          */
6183         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6184         /* get length and mbuf chain */
6185         if (uio) {
6186                 ca->sndlen = uio->uio_resid;
6187                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6188                 if (ca->m == NULL) {
6189                         SCTP_FREE(ca, SCTP_M_COPYAL);
6190                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6191                         return (ENOMEM);
6192                 }
6193         } else {
6194                 /* Gather the length of the send */
6195                 struct mbuf *mat;
6196
6197                 mat = m;
6198                 ca->sndlen = 0;
6199                 while (m) {
6200                         ca->sndlen += SCTP_BUF_LEN(m);
6201                         m = SCTP_BUF_NEXT(m);
6202                 }
6203                 ca->m = mat;
6204         }
6205         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6206             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6207             SCTP_ASOC_ANY_STATE,
6208             (void *)ca, 0,
6209             sctp_sendall_completes, inp, 1);
6210         if (ret) {
6211                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6212                 SCTP_FREE(ca, SCTP_M_COPYAL);
6213                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6214                 return (EFAULT);
6215         }
6216         return (0);
6217 }
6218
6219
6220 void
6221 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6222 {
6223         struct sctp_tmit_chunk *chk, *nchk;
6224
6225         chk = TAILQ_FIRST(&asoc->control_send_queue);
6226         while (chk) {
6227                 nchk = TAILQ_NEXT(chk, sctp_next);
6228                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6229                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6230                         if (chk->data) {
6231                                 sctp_m_freem(chk->data);
6232                                 chk->data = NULL;
6233                         }
6234                         asoc->ctrl_queue_cnt--;
6235                         sctp_free_a_chunk(stcb, chk);
6236                 }
6237                 chk = nchk;
6238         }
6239 }
6240
6241 void
6242 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6243 {
6244         struct sctp_association *asoc;
6245         struct sctp_tmit_chunk *chk, *chk_tmp;
6246
6247         asoc = &stcb->asoc;
6248         for (chk = TAILQ_FIRST(&asoc->control_send_queue); chk != NULL;
6249             chk = chk_tmp) {
6250                 /* get next chk */
6251                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6252                 /* find SCTP_ASCONF chunk in queue (only one ever in queue) */
6253                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6254                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6255                         if (chk->data) {
6256                                 sctp_m_freem(chk->data);
6257                                 chk->data = NULL;
6258                         }
6259                         asoc->ctrl_queue_cnt--;
6260                         sctp_free_a_chunk(stcb, chk);
6261                 }
6262         }
6263 }
6264
6265
6266 static void
6267 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6268
6269     struct sctp_association *asoc,
6270     struct sctp_tmit_chunk **data_list,
6271     int bundle_at,
6272     struct sctp_nets *net)
6273 {
6274         int i;
6275         struct sctp_tmit_chunk *tp1;
6276
6277         for (i = 0; i < bundle_at; i++) {
6278                 /* off of the send queue */
6279                 if (i) {
6280                         /*
6281                          * Any chunk NOT 0 you zap the time chunk 0 gets
6282                          * zapped or set based on if a RTO measurment is
6283                          * needed.
6284                          */
6285                         data_list[i]->do_rtt = 0;
6286                 }
6287                 /* record time */
6288                 data_list[i]->sent_rcv_time = net->last_sent_time;
6289                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6290                 TAILQ_REMOVE(&asoc->send_queue,
6291                     data_list[i],
6292                     sctp_next);
6293                 /* on to the sent queue */
6294                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6295                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6296                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6297                         struct sctp_tmit_chunk *tpp;
6298
6299                         /* need to move back */
6300         back_up_more:
6301                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6302                         if (tpp == NULL) {
6303                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6304                                 goto all_done;
6305                         }
6306                         tp1 = tpp;
6307                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6308                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6309                                 goto back_up_more;
6310                         }
6311                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6312                 } else {
6313                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6314                             data_list[i],
6315                             sctp_next);
6316                 }
6317 all_done:
6318                 /* This does not lower until the cum-ack passes it */
6319                 asoc->sent_queue_cnt++;
6320                 asoc->send_queue_cnt--;
6321                 if ((asoc->peers_rwnd <= 0) &&
6322                     (asoc->total_flight == 0) &&
6323                     (bundle_at == 1)) {
6324                         /* Mark the chunk as being a window probe */
6325                         SCTP_STAT_INCR(sctps_windowprobed);
6326                 }
6327 #ifdef SCTP_AUDITING_ENABLED
6328                 sctp_audit_log(0xC2, 3);
6329 #endif
6330                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6331                 data_list[i]->snd_count = 1;
6332                 data_list[i]->rec.data.chunk_was_revoked = 0;
6333                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
6334                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6335                             data_list[i]->whoTo->flight_size,
6336                             data_list[i]->book_size,
6337                             (uintptr_t) data_list[i]->whoTo,
6338                             data_list[i]->rec.data.TSN_seq);
6339                 }
6340                 sctp_flight_size_increase(data_list[i]);
6341                 sctp_total_flight_increase(stcb, data_list[i]);
6342                 if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
6343                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6344                             asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
6345                 }
6346                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6347                     (uint32_t) (data_list[i]->send_size + sctp_peer_chunk_oh));
6348                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6349                         /* SWS sender side engages */
6350                         asoc->peers_rwnd = 0;
6351                 }
6352         }
6353 }
6354
6355 static void
6356 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6357 {
6358         struct sctp_tmit_chunk *chk, *nchk;
6359
6360         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6361             chk; chk = nchk) {
6362                 nchk = TAILQ_NEXT(chk, sctp_next);
6363                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6364                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6365                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6366                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6367                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6368                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6369                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6370                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6371                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6372                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6373                         /* Stray chunks must be cleaned up */
6374         clean_up_anyway:
6375                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6376                         if (chk->data) {
6377                                 sctp_m_freem(chk->data);
6378                                 chk->data = NULL;
6379                         }
6380                         asoc->ctrl_queue_cnt--;
6381                         sctp_free_a_chunk(stcb, chk);
6382                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6383                         /* special handling, we must look into the param */
6384                         if (chk != asoc->str_reset) {
6385                                 goto clean_up_anyway;
6386                         }
6387                 }
6388         }
6389 }
6390
6391
6392 static int
6393 sctp_can_we_split_this(struct sctp_tcb *stcb,
6394     uint32_t length,
6395     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6396 {
6397         /*
6398          * Make a decision on if I should split a msg into multiple parts.
6399          * This is only asked of incomplete messages.
6400          */
6401         if (eeor_on) {
6402                 /*
6403                  * If we are doing EEOR we need to always send it if its the
6404                  * entire thing, since it might be all the guy is putting in
6405                  * the hopper.
6406                  */
6407                 if (goal_mtu >= length) {
6408                         /*-
6409                          * If we have data outstanding,
6410                          * we get another chance when the sack
6411                          * arrives to transmit - wait for more data
6412                          */
6413                         if (stcb->asoc.total_flight == 0) {
6414                                 /*
6415                                  * If nothing is in flight, we zero the
6416                                  * packet counter.
6417                                  */
6418                                 return (length);
6419                         }
6420                         return (0);
6421
6422                 } else {
6423                         /* You can fill the rest */
6424                         return (goal_mtu);
6425                 }
6426         }
6427         /*-
6428          * For those strange folk that make the send buffer
6429          * smaller than our fragmentation point, we can't
6430          * get a full msg in so we have to allow splitting.
6431          */
6432         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6433                 return (length);
6434         }
6435         if ((length <= goal_mtu) ||
6436             ((length - goal_mtu) < sctp_min_residual)) {
6437                 /* Sub-optimial residual don't split in non-eeor mode. */
6438                 return (0);
6439         }
6440         /*
6441          * If we reach here length is larger than the goal_mtu. Do we wish
6442          * to split it for the sake of packet putting together?
6443          */
6444         if (goal_mtu >= min(sctp_min_split_point, frag_point)) {
6445                 /* Its ok to split it */
6446                 return (min(goal_mtu, frag_point));
6447         }
6448         /* Nope, can't split */
6449         return (0);
6450
6451 }
6452
6453 static uint32_t
6454 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6455     struct sctp_stream_out *strq,
6456     uint32_t goal_mtu,
6457     uint32_t frag_point,
6458     int *locked,
6459     int *giveup,
6460     int eeor_mode,
6461     int *bail)
6462 {
6463         /* Move from the stream to the send_queue keeping track of the total */
6464         struct sctp_association *asoc;
6465         struct sctp_stream_queue_pending *sp;
6466         struct sctp_tmit_chunk *chk;
6467         struct sctp_data_chunk *dchkh;
6468         uint32_t to_move, length;
6469         uint8_t rcv_flags = 0;
6470         uint8_t some_taken;
6471         uint8_t send_lock_up = 0;
6472
6473         SCTP_TCB_LOCK_ASSERT(stcb);
6474         asoc = &stcb->asoc;
6475 one_more_time:
6476         /* sa_ignore FREED_MEMORY */
6477         sp = TAILQ_FIRST(&strq->outqueue);
6478         if (sp == NULL) {
6479                 *locked = 0;
6480                 if (send_lock_up == 0) {
6481                         SCTP_TCB_SEND_LOCK(stcb);
6482                         send_lock_up = 1;
6483                 }
6484                 sp = TAILQ_FIRST(&strq->outqueue);
6485                 if (sp) {
6486                         goto one_more_time;
6487                 }
6488                 if (strq->last_msg_incomplete) {
6489                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6490                             strq->stream_no,
6491                             strq->last_msg_incomplete);
6492                         strq->last_msg_incomplete = 0;
6493                 }
6494                 to_move = 0;
6495                 if (send_lock_up) {
6496                         SCTP_TCB_SEND_UNLOCK(stcb);
6497                         send_lock_up = 0;
6498                 }
6499                 goto out_of;
6500         }
6501         if ((sp->msg_is_complete) && (sp->length == 0)) {
6502                 if (sp->sender_all_done) {
6503                         /*
6504                          * We are doing differed cleanup. Last time through
6505                          * when we took all the data the sender_all_done was
6506                          * not set.
6507                          */
6508                         if (sp->put_last_out == 0) {
6509                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6510                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6511                                     sp->sender_all_done,
6512                                     sp->length,
6513                                     sp->msg_is_complete,
6514                                     sp->put_last_out,
6515                                     send_lock_up);
6516                         }
6517                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6518                                 SCTP_TCB_SEND_LOCK(stcb);
6519                                 send_lock_up = 1;
6520                         }
6521                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6522                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6523                         sctp_free_remote_addr(sp->net);
6524                         if (sp->data) {
6525                                 sctp_m_freem(sp->data);
6526                                 sp->data = NULL;
6527                         }
6528                         sctp_free_a_strmoq(stcb, sp);
6529
6530                         /* we can't be locked to it */
6531                         *locked = 0;
6532                         stcb->asoc.locked_on_sending = NULL;
6533                         if (send_lock_up) {
6534                                 SCTP_TCB_SEND_UNLOCK(stcb);
6535                                 send_lock_up = 0;
6536                         }
6537                         /* back to get the next msg */
6538                         goto one_more_time;
6539                 } else {
6540                         /*
6541                          * sender just finished this but still holds a
6542                          * reference
6543                          */
6544                         *locked = 1;
6545                         *giveup = 1;
6546                         to_move = 0;
6547                         goto out_of;
6548                 }
6549         } else {
6550                 /* is there some to get */
6551                 if (sp->length == 0) {
6552                         /* no */
6553                         *locked = 1;
6554                         *giveup = 1;
6555                         to_move = 0;
6556                         goto out_of;
6557                 }
6558         }
6559         some_taken = sp->some_taken;
6560         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6561                 sp->msg_is_complete = 1;
6562         }
6563 re_look:
6564         length = sp->length;
6565         if (sp->msg_is_complete) {
6566                 /* The message is complete */
6567                 to_move = min(length, frag_point);
6568                 if (to_move == length) {
6569                         /* All of it fits in the MTU */
6570                         if (sp->some_taken) {
6571                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6572                                 sp->put_last_out = 1;
6573                         } else {
6574                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6575                                 sp->put_last_out = 1;
6576                         }
6577                 } else {
6578                         /* Not all of it fits, we fragment */
6579                         if (sp->some_taken == 0) {
6580                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6581                         }
6582                         sp->some_taken = 1;
6583                 }
6584         } else {
6585                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu,
6586                     frag_point, eeor_mode);
6587                 if (to_move) {
6588                         /*-
6589                          * We use a snapshot of length in case it
6590                          * is expanding during the compare.
6591                          */
6592                         uint32_t llen;
6593
6594                         llen = length;
6595                         if (to_move >= llen) {
6596                                 to_move = llen;
6597                                 if (send_lock_up == 0) {
6598                                         /*-
6599                                          * We are taking all of an incomplete msg
6600                                          * thus we need a send lock.
6601                                          */
6602                                         SCTP_TCB_SEND_LOCK(stcb);
6603                                         send_lock_up = 1;
6604                                         if (sp->msg_is_complete) {
6605                                                 /*
6606                                                  * the sender finished the
6607                                                  * msg
6608                                                  */
6609                                                 goto re_look;
6610                                         }
6611                                 }
6612                         }
6613                         if (sp->some_taken == 0) {
6614                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6615                                 sp->some_taken = 1;
6616                         }
6617                 } else {
6618                         /* Nothing to take. */
6619                         if (sp->some_taken) {
6620                                 *locked = 1;
6621                         }
6622                         *giveup = 1;
6623                         to_move = 0;
6624                         goto out_of;
6625                 }
6626         }
6627
6628         /* If we reach here, we can copy out a chunk */
6629         sctp_alloc_a_chunk(stcb, chk);
6630         if (chk == NULL) {
6631                 /* No chunk memory */
6632                 *giveup = 1;
6633                 to_move = 0;
6634                 goto out_of;
6635         }
6636         /*
6637          * Setup for unordered if needed by looking at the user sent info
6638          * flags.
6639          */
6640         if (sp->sinfo_flags & SCTP_UNORDERED) {
6641                 rcv_flags |= SCTP_DATA_UNORDERED;
6642         }
6643         /* clear out the chunk before setting up */
6644         memset(chk, 0, sizeof(*chk));
6645         chk->rec.data.rcv_flags = rcv_flags;
6646
6647         if (to_move >= length) {
6648                 /* we think we can steal the whole thing */
6649                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6650                         SCTP_TCB_SEND_LOCK(stcb);
6651                         send_lock_up = 1;
6652                 }
6653                 if (to_move < sp->length) {
6654                         /* bail, it changed */
6655                         goto dont_do_it;
6656                 }
6657                 chk->data = sp->data;
6658                 chk->last_mbuf = sp->tail_mbuf;
6659                 /* register the stealing */
6660                 sp->data = sp->tail_mbuf = NULL;
6661         } else {
6662                 struct mbuf *m;
6663
6664 dont_do_it:
6665                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6666                 chk->last_mbuf = NULL;
6667                 if (chk->data == NULL) {
6668                         sp->some_taken = some_taken;
6669                         sctp_free_a_chunk(stcb, chk);
6670                         *bail = 1;
6671                         to_move = 0;
6672                         goto out_of;
6673                 }
6674 #ifdef SCTP_MBUF_LOGGING
6675                 if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
6676                         struct mbuf *mat;
6677
6678                         mat = chk->data;
6679                         while (mat) {
6680                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6681                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6682                                 }
6683                                 mat = SCTP_BUF_NEXT(mat);
6684                         }
6685                 }
6686 #endif
6687                 /* Pull off the data */
6688                 m_adj(sp->data, to_move);
6689                 /* Now lets work our way down and compact it */
6690                 m = sp->data;
6691                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6692                         sp->data = SCTP_BUF_NEXT(m);
6693                         SCTP_BUF_NEXT(m) = NULL;
6694                         if (sp->tail_mbuf == m) {
6695                                 /*-
6696                                  * Freeing tail? TSNH since
6697                                  * we supposedly were taking less
6698                                  * than the sp->length.
6699                                  */
6700 #ifdef INVARIANTS
6701                                 panic("Huh, freing tail? - TSNH");
6702 #else
6703                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6704                                 sp->tail_mbuf = sp->data = NULL;
6705                                 sp->length = 0;
6706 #endif
6707
6708                         }
6709                         sctp_m_free(m);
6710                         m = sp->data;
6711                 }
6712         }
6713         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6714                 chk->copy_by_ref = 1;
6715         } else {
6716                 chk->copy_by_ref = 0;
6717         }
6718         /*
6719          * get last_mbuf and counts of mb useage This is ugly but hopefully
6720          * its only one mbuf.
6721          */
6722         if (chk->last_mbuf == NULL) {
6723                 chk->last_mbuf = chk->data;
6724                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6725                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6726                 }
6727         }
6728         if (to_move > length) {
6729                 /*- This should not happen either
6730                  * since we always lower to_move to the size
6731                  * of sp->length if its larger.
6732                  */
6733 #ifdef INVARIANTS
6734                 panic("Huh, how can to_move be larger?");
6735 #else
6736                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6737                 sp->length = 0;
6738 #endif
6739         } else {
6740                 atomic_subtract_int(&sp->length, to_move);
6741         }
6742         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6743                 /* Not enough room for a chunk header, get some */
6744                 struct mbuf *m;
6745
6746                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6747                 if (m == NULL) {
6748                         /*
6749                          * we're in trouble here. _PREPEND below will free
6750                          * all the data if there is no leading space, so we
6751                          * must put the data back and restore.
6752                          */
6753                         if (send_lock_up == 0) {
6754                                 SCTP_TCB_SEND_LOCK(stcb);
6755                                 send_lock_up = 1;
6756                         }
6757                         if (chk->data == NULL) {
6758                                 /* unsteal the data */
6759                                 sp->data = chk->data;
6760                                 sp->tail_mbuf = chk->last_mbuf;
6761                         } else {
6762                                 struct mbuf *m_tmp;
6763
6764                                 /* reassemble the data */
6765                                 m_tmp = sp->data;
6766                                 sp->data = chk->data;
6767                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
6768                         }
6769                         sp->some_taken = some_taken;
6770                         atomic_add_int(&sp->length, to_move);
6771                         chk->data = NULL;
6772                         *bail = 1;
6773                         sctp_free_a_chunk(stcb, chk);
6774                         to_move = 0;
6775                         goto out_of;
6776                 } else {
6777                         SCTP_BUF_LEN(m) = 0;
6778                         SCTP_BUF_NEXT(m) = chk->data;
6779                         chk->data = m;
6780                         M_ALIGN(chk->data, 4);
6781                 }
6782         }
6783         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
6784         if (chk->data == NULL) {
6785                 /* HELP, TSNH since we assured it would not above? */
6786 #ifdef INVARIANTS
6787                 panic("prepend failes HELP?");
6788 #else
6789                 SCTP_PRINTF("prepend fails HELP?\n");
6790                 sctp_free_a_chunk(stcb, chk);
6791 #endif
6792                 *bail = 1;
6793                 to_move = 0;
6794                 goto out_of;
6795         }
6796         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
6797         chk->book_size = chk->send_size = (to_move +
6798             sizeof(struct sctp_data_chunk));
6799         chk->book_size_scale = 0;
6800         chk->sent = SCTP_DATAGRAM_UNSENT;
6801
6802         chk->flags = 0;
6803         chk->asoc = &stcb->asoc;
6804         chk->pad_inplace = 0;
6805         chk->no_fr_allowed = 0;
6806         chk->rec.data.stream_seq = sp->strseq;
6807         chk->rec.data.stream_number = sp->stream;
6808         chk->rec.data.payloadtype = sp->ppid;
6809         chk->rec.data.context = sp->context;
6810         chk->rec.data.doing_fast_retransmit = 0;
6811         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
6812
6813         chk->rec.data.timetodrop = sp->ts;
6814         chk->flags = sp->act_flags;
6815         chk->addr_over = sp->addr_over;
6816
6817         chk->whoTo = net;
6818         atomic_add_int(&chk->whoTo->ref_count, 1);
6819
6820         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
6821         if (sctp_logging_level & SCTP_LOG_AT_SEND_2_OUTQ) {
6822                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
6823                     (uintptr_t) stcb, sp->length,
6824                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
6825                     chk->rec.data.TSN_seq);
6826         }
6827         dchkh = mtod(chk->data, struct sctp_data_chunk *);
6828         /*
6829          * Put the rest of the things in place now. Size was done earlier in
6830          * previous loop prior to padding.
6831          */
6832
6833 #ifdef SCTP_ASOCLOG_OF_TSNS
6834         SCTP_TCB_LOCK_ASSERT(stcb);
6835         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
6836                 asoc->tsn_out_at = 0;
6837                 asoc->tsn_out_wrapped = 1;
6838         }
6839         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
6840         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
6841         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
6842         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
6843         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
6844         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
6845         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
6846         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
6847         asoc->tsn_out_at++;
6848 #endif
6849
6850         dchkh->ch.chunk_type = SCTP_DATA;
6851         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
6852         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
6853         dchkh->dp.stream_id = htons(strq->stream_no);
6854         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
6855         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
6856         dchkh->ch.chunk_length = htons(chk->send_size);
6857         /* Now advance the chk->send_size by the actual pad needed. */
6858         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
6859                 /* need a pad */
6860                 struct mbuf *lm;
6861                 int pads;
6862
6863                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
6864                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
6865                         chk->pad_inplace = 1;
6866                 }
6867                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
6868                         /* pad added an mbuf */
6869                         chk->last_mbuf = lm;
6870                 }
6871                 chk->send_size += pads;
6872         }
6873         /* We only re-set the policy if it is on */
6874         if (sp->pr_sctp_on) {
6875                 sctp_set_prsctp_policy(stcb, sp);
6876                 asoc->pr_sctp_cnt++;
6877                 chk->pr_sctp_on = 1;
6878         } else {
6879                 chk->pr_sctp_on = 0;
6880         }
6881         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
6882                 /* All done pull and kill the message */
6883                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6884                 if (sp->put_last_out == 0) {
6885                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
6886                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6887                             sp->sender_all_done,
6888                             sp->length,
6889                             sp->msg_is_complete,
6890                             sp->put_last_out,
6891                             send_lock_up);
6892                 }
6893                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
6894                         SCTP_TCB_SEND_LOCK(stcb);
6895                         send_lock_up = 1;
6896                 }
6897                 TAILQ_REMOVE(&strq->outqueue, sp, next);
6898                 sctp_free_remote_addr(sp->net);
6899                 if (sp->data) {
6900                         sctp_m_freem(sp->data);
6901                         sp->data = NULL;
6902                 }
6903                 sctp_free_a_strmoq(stcb, sp);
6904
6905                 /* we can't be locked to it */
6906                 *locked = 0;
6907                 stcb->asoc.locked_on_sending = NULL;
6908         } else {
6909                 /* more to go, we are locked */
6910                 *locked = 1;
6911         }
6912         asoc->chunks_on_out_queue++;
6913         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
6914         asoc->send_queue_cnt++;
6915 out_of:
6916         if (send_lock_up) {
6917                 SCTP_TCB_SEND_UNLOCK(stcb);
6918                 send_lock_up = 0;
6919         }
6920         return (to_move);
6921 }
6922
6923
6924 static struct sctp_stream_out *
6925 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
6926 {
6927         struct sctp_stream_out *strq;
6928
6929         /* Find the next stream to use */
6930         if (asoc->last_out_stream == NULL) {
6931                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
6932                 if (asoc->last_out_stream == NULL) {
6933                         /* huh nothing on the wheel, TSNH */
6934                         return (NULL);
6935                 }
6936                 goto done_it;
6937         }
6938         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
6939 done_it:
6940         if (strq == NULL) {
6941                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
6942         }
6943         /* Save off the last stream */
6944         asoc->last_out_stream = strq;
6945         return (strq);
6946
6947 }
6948
6949
6950 static void
6951 sctp_fill_outqueue(struct sctp_tcb *stcb,
6952     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
6953 {
6954         struct sctp_association *asoc;
6955         struct sctp_stream_out *strq, *strqn, *strqt;
6956         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
6957         int locked, giveup;
6958         struct sctp_stream_queue_pending *sp;
6959
6960         SCTP_TCB_LOCK_ASSERT(stcb);
6961         asoc = &stcb->asoc;
6962 #ifdef INET6
6963         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
6964                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
6965         } else {
6966                 /* ?? not sure what else to do */
6967                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
6968         }
6969 #else
6970         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
6971 #endif
6972         /* Need an allowance for the data chunk header too */
6973         goal_mtu -= sizeof(struct sctp_data_chunk);
6974
6975         /* must make even word boundary */
6976         goal_mtu &= 0xfffffffc;
6977         if (asoc->locked_on_sending) {
6978                 /* We are stuck on one stream until the message completes. */
6979                 strqn = strq = asoc->locked_on_sending;
6980                 locked = 1;
6981         } else {
6982                 strqn = strq = sctp_select_a_stream(stcb, asoc);
6983                 locked = 0;
6984         }
6985
6986         while ((goal_mtu > 0) && strq) {
6987                 sp = TAILQ_FIRST(&strq->outqueue);
6988                 /*
6989                  * If CMT is off, we must validate that the stream in
6990                  * question has the first item pointed towards are network
6991                  * destionation requested by the caller. Note that if we
6992                  * turn out to be locked to a stream (assigning TSN's then
6993                  * we must stop, since we cannot look for another stream
6994                  * with data to send to that destination). In CMT's case, by
6995                  * skipping this check, we will send one data packet towards
6996                  * the requested net.
6997                  */
6998                 if (sp == NULL) {
6999                         break;
7000                 }
7001                 if ((sp->net != net) && (sctp_cmt_on_off == 0)) {
7002                         /* none for this network */
7003                         if (locked) {
7004                                 break;
7005                         } else {
7006                                 strq = sctp_select_a_stream(stcb, asoc);
7007                                 if (strq == NULL)
7008                                         /* none left */
7009                                         break;
7010                                 if (strqn == strq) {
7011                                         /* I have circled */
7012                                         break;
7013                                 }
7014                                 continue;
7015                         }
7016                 }
7017                 giveup = 0;
7018                 bail = 0;
7019                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7020                     &giveup, eeor_mode, &bail);
7021                 asoc->last_out_stream = strq;
7022                 if (locked) {
7023                         asoc->locked_on_sending = strq;
7024                         if ((moved_how_much == 0) || (giveup) || bail)
7025                                 /* no more to move for now */
7026                                 break;
7027                 } else {
7028                         asoc->locked_on_sending = NULL;
7029                         strqt = sctp_select_a_stream(stcb, asoc);
7030                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
7031                                 if (strq == strqn) {
7032                                         /* Must move start to next one */
7033                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7034                                         if (strqn == NULL) {
7035                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7036                                                 if (strqn == NULL) {
7037                                                         break;
7038                                                 }
7039                                         }
7040                                 }
7041                                 sctp_remove_from_wheel(stcb, asoc, strq);
7042                         }
7043                         if ((giveup) || bail) {
7044                                 break;
7045                         }
7046                         strq = strqt;
7047                         if (strq == NULL) {
7048                                 break;
7049                         }
7050                 }
7051                 total_moved += moved_how_much;
7052                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7053                 goal_mtu &= 0xfffffffc;
7054         }
7055         if (bail)
7056                 *quit_now = 1;
7057
7058         if (total_moved == 0) {
7059                 if ((sctp_cmt_on_off == 0) &&
7060                     (net == stcb->asoc.primary_destination)) {
7061                         /* ran dry for primary network net */
7062                         SCTP_STAT_INCR(sctps_primary_randry);
7063                 } else if (sctp_cmt_on_off) {
7064                         /* ran dry with CMT on */
7065                         SCTP_STAT_INCR(sctps_cmt_randry);
7066                 }
7067         }
7068 }
7069
7070 void
7071 sctp_fix_ecn_echo(struct sctp_association *asoc)
7072 {
7073         struct sctp_tmit_chunk *chk;
7074
7075         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7076                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7077                         chk->sent = SCTP_DATAGRAM_UNSENT;
7078                 }
7079         }
7080 }
7081
7082 static void
7083 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7084     struct sctp_association *asoc,
7085     struct sctp_nets *net)
7086 {
7087         struct sctp_tmit_chunk *chk;
7088         struct sctp_nets *a_net;
7089
7090         SCTP_TCB_LOCK_ASSERT(stcb);
7091         /*
7092          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7093          * destination using the PF algorithm for finding alternate
7094          * destinations.
7095          */
7096         if (sctp_cmt_on_off && sctp_cmt_pf) {
7097                 a_net = sctp_find_alternate_net(stcb, net, 2);
7098         } else {
7099                 a_net = sctp_find_alternate_net(stcb, net, 0);
7100         }
7101         if ((a_net != net) &&
7102             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7103                 /*
7104                  * We only proceed if a valid alternate is found that is not
7105                  * this one and is reachable. Here we must move all chunks
7106                  * queued in the send queue off of the destination address
7107                  * to our alternate.
7108                  */
7109                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7110                         if (chk->whoTo == net) {
7111                                 /* Move the chunk to our alternate */
7112                                 sctp_free_remote_addr(chk->whoTo);
7113                                 chk->whoTo = a_net;
7114                                 atomic_add_int(&a_net->ref_count, 1);
7115                         }
7116                 }
7117         }
7118 }
7119
7120 int
7121 sctp_med_chunk_output(struct sctp_inpcb *inp,
7122     struct sctp_tcb *stcb,
7123     struct sctp_association *asoc,
7124     int *num_out,
7125     int *reason_code,
7126     int control_only, int *cwnd_full, int from_where,
7127     struct timeval *now, int *now_filled, int frag_point, int so_locked
7128 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7129     SCTP_UNUSED
7130 #endif
7131 )
7132 {
7133         /*
7134          * Ok this is the generic chunk service queue. we must do the
7135          * following: - Service the stream queue that is next, moving any
7136          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7137          * LAST to the out queue in one pass) and assigning TSN's - Check to
7138          * see if the cwnd/rwnd allows any output, if so we go ahead and
7139          * fomulate and send the low level chunks. Making sure to combine
7140          * any control in the control chunk queue also.
7141          */
7142         struct sctp_nets *net;
7143         struct mbuf *outchain, *endoutchain;
7144         struct sctp_tmit_chunk *chk, *nchk;
7145         struct sctphdr *shdr;
7146
7147         /* temp arrays for unlinking */
7148         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7149         int no_fragmentflg, error;
7150         int one_chunk, hbflag, skip_data_for_this_net;
7151         int asconf, cookie, no_out_cnt;
7152         int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
7153         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7154         struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
7155         int tsns_sent = 0;
7156         uint32_t auth_offset = 0;
7157         struct sctp_auth_chunk *auth = NULL;
7158
7159         /*
7160          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7161          * destination.
7162          */
7163         int pf_hbflag = 0;
7164         int quit_now = 0;
7165
7166         *num_out = 0;
7167         cwnd_full_ind = 0;
7168
7169         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7170             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7171             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7172                 eeor_mode = 1;
7173         } else {
7174                 eeor_mode = 0;
7175         }
7176         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7177         /*
7178          * First lets prime the pump. For each destination, if there is room
7179          * in the flight size, attempt to pull an MTU's worth out of the
7180          * stream queues into the general send_queue
7181          */
7182 #ifdef SCTP_AUDITING_ENABLED
7183         sctp_audit_log(0xC2, 2);
7184 #endif
7185         SCTP_TCB_LOCK_ASSERT(stcb);
7186         hbflag = 0;
7187         if ((control_only) || (asoc->stream_reset_outstanding))
7188                 no_data_chunks = 1;
7189         else
7190                 no_data_chunks = 0;
7191
7192         /* Nothing to possible to send? */
7193         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7194             TAILQ_EMPTY(&asoc->send_queue) &&
7195             TAILQ_EMPTY(&asoc->out_wheel)) {
7196                 *reason_code = 9;
7197                 return (0);
7198         }
7199         if (asoc->peers_rwnd == 0) {
7200                 /* No room in peers rwnd */
7201                 *cwnd_full = 1;
7202                 *reason_code = 1;
7203                 if (asoc->total_flight > 0) {
7204                         /* we are allowed one chunk in flight */
7205                         no_data_chunks = 1;
7206                 }
7207         }
7208         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7209                 if (sctp_cmt_on_off) {
7210                         /*
7211                          * for CMT we start at the next one past the one we
7212                          * last added data to.
7213                          */
7214                         if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
7215                                 goto skip_the_fill_from_streams;
7216                         }
7217                         if (asoc->last_net_data_came_from) {
7218                                 net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
7219                                 if (net == NULL) {
7220                                         net = TAILQ_FIRST(&asoc->nets);
7221                                 }
7222                         } else {
7223                                 /* back to start */
7224                                 net = TAILQ_FIRST(&asoc->nets);
7225                         }
7226
7227                         /*
7228                          * JRI-TODO: CMT-MPI. Simply set the first
7229                          * destination (net) to be optimized for the next
7230                          * message to be pulled out of the outwheel. 1. peek
7231                          * at outwheel 2. If large message, set net =
7232                          * highest_cwnd 3. If small message, set net =
7233                          * lowest rtt
7234                          */
7235                 } else {
7236                         net = asoc->primary_destination;
7237                         if (net == NULL) {
7238                                 /* TSNH */
7239                                 net = TAILQ_FIRST(&asoc->nets);
7240                         }
7241                 }
7242                 start_at = net;
7243
7244 one_more_time:
7245                 for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7246                         net->window_probe = 0;
7247                         if (old_startat && (old_startat == net)) {
7248                                 break;
7249                         }
7250                         /*
7251                          * JRI: if dest is unreachable or unconfirmed, do
7252                          * not send data to it
7253                          */
7254                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7255                                 continue;
7256                         }
7257                         /*
7258                          * JRI: if dest is in PF state, do not send data to
7259                          * it
7260                          */
7261                         if (sctp_cmt_on_off && sctp_cmt_pf && (net->dest_state & SCTP_ADDR_PF)) {
7262                                 continue;
7263                         }
7264                         if ((sctp_cmt_on_off == 0) && (net->ref_count < 2)) {
7265                                 /* nothing can be in queue for this guy */
7266                                 continue;
7267                         }
7268                         if (net->flight_size >= net->cwnd) {
7269                                 /* skip this network, no room */
7270                                 cwnd_full_ind++;
7271                                 continue;
7272                         }
7273                         /*
7274                          * JRI : this for loop we are in takes in each net,
7275                          * if its's got space in cwnd and has data sent to
7276                          * it (when CMT is off) then it calls
7277                          * sctp_fill_outqueue for the net. This gets data on
7278                          * the send queue for that network.
7279                          *
7280                          * In sctp_fill_outqueue TSN's are assigned and data is
7281                          * copied out of the stream buffers. Note mostly
7282                          * copy by reference (we hope).
7283                          */
7284                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7285                                 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7286                         }
7287                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7288                         if (quit_now) {
7289                                 /* memory alloc failure */
7290                                 no_data_chunks = 1;
7291                                 goto skip_the_fill_from_streams;
7292                         }
7293                 }
7294                 if (start_at != TAILQ_FIRST(&asoc->nets)) {
7295                         /* got to pick up the beginning stuff. */
7296                         old_startat = start_at;
7297                         start_at = net = TAILQ_FIRST(&asoc->nets);
7298                         if (old_startat)
7299                                 goto one_more_time;
7300                 }
7301         }
7302 skip_the_fill_from_streams:
7303         *cwnd_full = cwnd_full_ind;
7304
7305         /* now service each destination and send out what we can for it */
7306         /* Nothing to send? */
7307         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7308             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7309                 *reason_code = 8;
7310                 return (0);
7311         }
7312         if (no_data_chunks) {
7313                 chk = TAILQ_FIRST(&asoc->control_send_queue);
7314         } else {
7315                 chk = TAILQ_FIRST(&asoc->send_queue);
7316         }
7317         if (chk) {
7318                 send_start_at = chk->whoTo;
7319         } else {
7320                 send_start_at = TAILQ_FIRST(&asoc->nets);
7321         }
7322         old_startat = NULL;
7323 again_one_more_time:
7324         for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7325                 /* how much can we send? */
7326                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7327                 if (old_startat && (old_startat == net)) {
7328                         /* through list ocmpletely. */
7329                         break;
7330                 }
7331                 tsns_sent = 0;
7332                 if (net->ref_count < 2) {
7333                         /*
7334                          * Ref-count of 1 so we cannot have data or control
7335                          * queued to this address. Skip it.
7336                          */
7337                         continue;
7338                 }
7339                 ctl_cnt = bundle_at = 0;
7340                 endoutchain = outchain = NULL;
7341                 no_fragmentflg = 1;
7342                 one_chunk = 0;
7343                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7344                         skip_data_for_this_net = 1;
7345                 } else {
7346                         skip_data_for_this_net = 0;
7347                 }
7348                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7349                         /*
7350                          * if we have a route and an ifp check to see if we
7351                          * have room to send to this guy
7352                          */
7353                         struct ifnet *ifp;
7354
7355                         ifp = net->ro.ro_rt->rt_ifp;
7356                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7357                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7358                                 if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
7359                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7360                                 }
7361                                 continue;
7362                         }
7363                 }
7364                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7365                 case AF_INET:
7366                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7367                         break;
7368 #ifdef INET6
7369                 case AF_INET6:
7370                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7371                         break;
7372 #endif
7373                 default:
7374                         /* TSNH */
7375                         mtu = net->mtu;
7376                         break;
7377                 }
7378                 mx_mtu = mtu;
7379                 to_out = 0;
7380                 if (mtu > asoc->peers_rwnd) {
7381                         if (asoc->total_flight > 0) {
7382                                 /* We have a packet in flight somewhere */
7383                                 r_mtu = asoc->peers_rwnd;
7384                         } else {
7385                                 /* We are always allowed to send one MTU out */
7386                                 one_chunk = 1;
7387                                 r_mtu = mtu;
7388                         }
7389                 } else {
7390                         r_mtu = mtu;
7391                 }
7392                 /************************/
7393                 /* Control transmission */
7394                 /************************/
7395                 /* Now first lets go through the control queue */
7396                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7397                     chk; chk = nchk) {
7398                         nchk = TAILQ_NEXT(chk, sctp_next);
7399                         if (chk->whoTo != net) {
7400                                 /*
7401                                  * No, not sent to the network we are
7402                                  * looking at
7403                                  */
7404                                 continue;
7405                         }
7406                         if (chk->data == NULL) {
7407                                 continue;
7408                         }
7409                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7410                                 /*
7411                                  * It must be unsent. Cookies and ASCONF's
7412                                  * hang around but there timers will force
7413                                  * when marked for resend.
7414                                  */
7415                                 continue;
7416                         }
7417                         /*
7418                          * if no AUTH is yet included and this chunk
7419                          * requires it, make sure to account for it.  We
7420                          * don't apply the size until the AUTH chunk is
7421                          * actually added below in case there is no room for
7422                          * this chunk. NOTE: we overload the use of "omtu"
7423                          * here
7424                          */
7425                         if ((auth == NULL) &&
7426                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7427                             stcb->asoc.peer_auth_chunks)) {
7428                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7429                         } else
7430                                 omtu = 0;
7431                         /* Here we do NOT factor the r_mtu */
7432                         if ((chk->send_size < (int)(mtu - omtu)) ||
7433                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7434                                 /*
7435                                  * We probably should glom the mbuf chain
7436                                  * from the chk->data for control but the
7437                                  * problem is it becomes yet one more level
7438                                  * of tracking to do if for some reason
7439                                  * output fails. Then I have got to
7440                                  * reconstruct the merged control chain.. el
7441                                  * yucko.. for now we take the easy way and
7442                                  * do the copy
7443                                  */
7444                                 /*
7445                                  * Add an AUTH chunk, if chunk requires it
7446                                  * save the offset into the chain for AUTH
7447                                  */
7448                                 if ((auth == NULL) &&
7449                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7450                                     stcb->asoc.peer_auth_chunks))) {
7451                                         outchain = sctp_add_auth_chunk(outchain,
7452                                             &endoutchain,
7453                                             &auth,
7454                                             &auth_offset,
7455                                             stcb,
7456                                             chk->rec.chunk_id.id);
7457                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7458                                 }
7459                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7460                                     (int)chk->rec.chunk_id.can_take_data,
7461                                     chk->send_size, chk->copy_by_ref);
7462                                 if (outchain == NULL) {
7463                                         *reason_code = 8;
7464                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7465                                         return (ENOMEM);
7466                                 }
7467                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7468                                 /* update our MTU size */
7469                                 if (mtu > (chk->send_size + omtu))
7470                                         mtu -= (chk->send_size + omtu);
7471                                 else
7472                                         mtu = 0;
7473                                 to_out += (chk->send_size + omtu);
7474                                 /* Do clear IP_DF ? */
7475                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7476                                         no_fragmentflg = 0;
7477                                 }
7478                                 if (chk->rec.chunk_id.can_take_data)
7479                                         chk->data = NULL;
7480                                 /* Mark things to be removed, if needed */
7481                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7482                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7483                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7484                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7485                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7486                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7487                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7488                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7489                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7490                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7491
7492                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7493                                                 hbflag = 1;
7494                                                 /*
7495                                                  * JRS 5/14/07 - Set the
7496                                                  * flag to say a heartbeat
7497                                                  * is being sent.
7498                                                  */
7499                                                 pf_hbflag = 1;
7500                                         }
7501                                         /* remove these chunks at the end */
7502                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7503                                                 /* turn off the timer */
7504                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7505                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7506                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7507                                                 }
7508                                         }
7509                                         ctl_cnt++;
7510                                 } else {
7511                                         /*
7512                                          * Other chunks, since they have
7513                                          * timers running (i.e. COOKIE or
7514                                          * ASCONF) we just "trust" that it
7515                                          * gets sent or retransmitted.
7516                                          */
7517                                         ctl_cnt++;
7518                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7519                                                 cookie = 1;
7520                                                 no_out_cnt = 1;
7521                                         } else if (chk->rec.chunk_id.id == SCTP_ASCONF) {
7522                                                 /*
7523                                                  * set hb flag since we can
7524                                                  * use these for RTO
7525                                                  */
7526                                                 hbflag = 1;
7527                                                 asconf = 1;
7528                                                 /*
7529                                                  * should sysctl this: don't
7530                                                  * bundle data with ASCONF
7531                                                  * since it requires AUTH
7532                                                  */
7533                                                 no_data_chunks = 1;
7534                                         }
7535                                         chk->sent = SCTP_DATAGRAM_SENT;
7536                                         chk->snd_count++;
7537                                 }
7538                                 if (mtu == 0) {
7539                                         /*
7540                                          * Ok we are out of room but we can
7541                                          * output without effecting the
7542                                          * flight size since this little guy
7543                                          * is a control only packet.
7544                                          */
7545                                         if (asconf) {
7546                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7547                                                 /*
7548                                                  * do NOT clear the asconf
7549                                                  * flag as it is used to do
7550                                                  * appropriate source
7551                                                  * address selection.
7552                                                  */
7553                                         }
7554                                         if (cookie) {
7555                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7556                                                 cookie = 0;
7557                                         }
7558                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7559                                         if (outchain == NULL) {
7560                                                 /* no memory */
7561                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7562                                                 error = ENOBUFS;
7563                                                 goto error_out_again;
7564                                         }
7565                                         shdr = mtod(outchain, struct sctphdr *);
7566                                         shdr->src_port = inp->sctp_lport;
7567                                         shdr->dest_port = stcb->rport;
7568                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7569                                         shdr->checksum = 0;
7570                                         auth_offset += sizeof(struct sctphdr);
7571                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7572                                             (struct sockaddr *)&net->ro._l_addr,
7573                                             outchain, auth_offset, auth,
7574                                             no_fragmentflg, 0, NULL, asconf, so_locked))) {
7575                                                 if (error == ENOBUFS) {
7576                                                         asoc->ifp_had_enobuf = 1;
7577                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7578                                                 }
7579                                                 if (from_where == 0) {
7580                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7581                                                 }
7582                                 error_out_again:
7583                                                 /* error, could not output */
7584                                                 if (hbflag) {
7585                                                         if (*now_filled == 0) {
7586                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7587                                                                 *now_filled = 1;
7588                                                                 *now = net->last_sent_time;
7589                                                         } else {
7590                                                                 net->last_sent_time = *now;
7591                                                         }
7592                                                         hbflag = 0;
7593                                                 }
7594                                                 if (error == EHOSTUNREACH) {
7595                                                         /*
7596                                                          * Destination went
7597                                                          * unreachable
7598                                                          * during this send
7599                                                          */
7600                                                         sctp_move_to_an_alt(stcb, asoc, net);
7601                                                 }
7602                                                 *reason_code = 7;
7603                                                 continue;
7604                                         } else
7605                                                 asoc->ifp_had_enobuf = 0;
7606                                         /* Only HB or ASCONF advances time */
7607                                         if (hbflag) {
7608                                                 if (*now_filled == 0) {
7609                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7610                                                         *now_filled = 1;
7611                                                         *now = net->last_sent_time;
7612                                                 } else {
7613                                                         net->last_sent_time = *now;
7614                                                 }
7615                                                 hbflag = 0;
7616                                         }
7617                                         /*
7618                                          * increase the number we sent, if a
7619                                          * cookie is sent we don't tell them
7620                                          * any was sent out.
7621                                          */
7622                                         outchain = endoutchain = NULL;
7623                                         auth = NULL;
7624                                         auth_offset = 0;
7625                                         if (!no_out_cnt)
7626                                                 *num_out += ctl_cnt;
7627                                         /* recalc a clean slate and setup */
7628                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7629                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7630                                         } else {
7631                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7632                                         }
7633                                         to_out = 0;
7634                                         no_fragmentflg = 1;
7635                                 }
7636                         }
7637                 }
7638                 /*********************/
7639                 /* Data transmission */
7640                 /*********************/
7641                 /*
7642                  * if AUTH for DATA is required and no AUTH has been added
7643                  * yet, account for this in the mtu now... if no data can be
7644                  * bundled, this adjustment won't matter anyways since the
7645                  * packet will be going out...
7646                  */
7647                 if ((auth == NULL) &&
7648                     sctp_auth_is_required_chunk(SCTP_DATA,
7649                     stcb->asoc.peer_auth_chunks)) {
7650                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7651                 }
7652                 /* now lets add any data within the MTU constraints */
7653                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7654                 case AF_INET:
7655                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
7656                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7657                         else
7658                                 omtu = 0;
7659                         break;
7660 #ifdef INET6
7661                 case AF_INET6:
7662                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
7663                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7664                         else
7665                                 omtu = 0;
7666                         break;
7667 #endif
7668                 default:
7669                         /* TSNH */
7670                         omtu = 0;
7671                         break;
7672                 }
7673                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) && (skip_data_for_this_net == 0)) ||
7674                     (cookie)) {
7675                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
7676                                 if (no_data_chunks) {
7677                                         /* let only control go out */
7678                                         *reason_code = 1;
7679                                         break;
7680                                 }
7681                                 if (net->flight_size >= net->cwnd) {
7682                                         /* skip this net, no room for data */
7683                                         *reason_code = 2;
7684                                         break;
7685                                 }
7686                                 nchk = TAILQ_NEXT(chk, sctp_next);
7687                                 if (chk->whoTo != net) {
7688                                         /* No, not sent to this net */
7689                                         continue;
7690                                 }
7691                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
7692                                         /*-
7693                                          * strange, we have a chunk that is
7694                                          * to big for its destination and
7695                                          * yet no fragment ok flag.
7696                                          * Something went wrong when the
7697                                          * PMTU changed...we did not mark
7698                                          * this chunk for some reason?? I
7699                                          * will fix it here by letting IP
7700                                          * fragment it for now and printing
7701                                          * a warning. This really should not
7702                                          * happen ...
7703                                          */
7704                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
7705                                             chk->send_size, mtu);
7706                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
7707                                 }
7708                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
7709                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
7710                                         /* ok we will add this one */
7711
7712                                         /*
7713                                          * Add an AUTH chunk, if chunk
7714                                          * requires it, save the offset into
7715                                          * the chain for AUTH
7716                                          */
7717                                         if ((auth == NULL) &&
7718                                             (sctp_auth_is_required_chunk(SCTP_DATA,
7719                                             stcb->asoc.peer_auth_chunks))) {
7720
7721                                                 outchain = sctp_add_auth_chunk(outchain,
7722                                                     &endoutchain,
7723                                                     &auth,
7724                                                     &auth_offset,
7725                                                     stcb,
7726                                                     SCTP_DATA);
7727                                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7728                                         }
7729                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
7730                                             chk->send_size, chk->copy_by_ref);
7731                                         if (outchain == NULL) {
7732                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
7733                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
7734                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7735                                                 }
7736                                                 *reason_code = 3;
7737                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7738                                                 return (ENOMEM);
7739                                         }
7740                                         /* upate our MTU size */
7741                                         /* Do clear IP_DF ? */
7742                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7743                                                 no_fragmentflg = 0;
7744                                         }
7745                                         /* unsigned subtraction of mtu */
7746                                         if (mtu > chk->send_size)
7747                                                 mtu -= chk->send_size;
7748                                         else
7749                                                 mtu = 0;
7750                                         /* unsigned subtraction of r_mtu */
7751                                         if (r_mtu > chk->send_size)
7752                                                 r_mtu -= chk->send_size;
7753                                         else
7754                                                 r_mtu = 0;
7755
7756                                         to_out += chk->send_size;
7757                                         if ((to_out > mx_mtu) && no_fragmentflg) {
7758 #ifdef INVARIANTS
7759                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
7760 #else
7761                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
7762                                                     mx_mtu, to_out);
7763 #endif
7764                                         }
7765                                         chk->window_probe = 0;
7766                                         data_list[bundle_at++] = chk;
7767                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
7768                                                 mtu = 0;
7769                                                 break;
7770                                         }
7771                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
7772                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
7773                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
7774                                                 } else {
7775                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
7776                                                 }
7777                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
7778                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
7779                                                         /*
7780                                                          * Count number of
7781                                                          * user msg's that
7782                                                          * were fragmented
7783                                                          * we do this by
7784                                                          * counting when we
7785                                                          * see a LAST
7786                                                          * fragment only.
7787                                                          */
7788                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
7789                                         }
7790                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
7791                                                 if (one_chunk) {
7792                                                         data_list[0]->window_probe = 1;
7793                                                         net->window_probe = 1;
7794                                                 }
7795                                                 break;
7796                                         }
7797                                 } else {
7798                                         /*
7799                                          * Must be sent in order of the
7800                                          * TSN's (on a network)
7801                                          */
7802                                         break;
7803                                 }
7804                         }       /* for (chunk gather loop for this net) */
7805                 }               /* if asoc.state OPEN */
7806                 /* Is there something to send for this destination? */
7807                 if (outchain) {
7808                         /* We may need to start a control timer or two */
7809                         if (asconf) {
7810                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
7811                                     stcb, net);
7812                                 /*
7813                                  * do NOT clear the asconf flag as it is
7814                                  * used to do appropriate source address
7815                                  * selection.
7816                                  */
7817                         }
7818                         if (cookie) {
7819                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7820                                 cookie = 0;
7821                         }
7822                         /* must start a send timer if data is being sent */
7823                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
7824                                 /*
7825                                  * no timer running on this destination
7826                                  * restart it.
7827                                  */
7828                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7829                         } else if (sctp_cmt_on_off && sctp_cmt_pf && pf_hbflag && ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)
7830                             && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
7831                                 /*
7832                                  * JRS 5/14/07 - If a HB has been sent to a
7833                                  * PF destination and no T3 timer is
7834                                  * currently running, start the T3 timer to
7835                                  * track the HBs that were sent.
7836                                  */
7837                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
7838                         }
7839                         /* Now send it, if there is anything to send :> */
7840                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7841                         if (outchain == NULL) {
7842                                 /* out of mbufs */
7843                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7844                                 error = ENOBUFS;
7845                                 goto errored_send;
7846                         }
7847                         shdr = mtod(outchain, struct sctphdr *);
7848                         shdr->src_port = inp->sctp_lport;
7849                         shdr->dest_port = stcb->rport;
7850                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7851                         shdr->checksum = 0;
7852                         auth_offset += sizeof(struct sctphdr);
7853                         if ((error = sctp_lowlevel_chunk_output(inp,
7854                             stcb,
7855                             net,
7856                             (struct sockaddr *)&net->ro._l_addr,
7857                             outchain,
7858                             auth_offset,
7859                             auth,
7860                             no_fragmentflg,
7861                             bundle_at,
7862                             data_list[0],
7863                             asconf, so_locked))) {
7864                                 /* error, we could not output */
7865                                 if (error == ENOBUFS) {
7866                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7867                                         asoc->ifp_had_enobuf = 1;
7868                                 }
7869                                 if (from_where == 0) {
7870                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7871                                 }
7872                 errored_send:
7873                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
7874                                 if (hbflag) {
7875                                         if (*now_filled == 0) {
7876                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7877                                                 *now_filled = 1;
7878                                                 *now = net->last_sent_time;
7879                                         } else {
7880                                                 net->last_sent_time = *now;
7881                                         }
7882                                         hbflag = 0;
7883                                 }
7884                                 if (error == EHOSTUNREACH) {
7885                                         /*
7886                                          * Destination went unreachable
7887                                          * during this send
7888                                          */
7889                                         sctp_move_to_an_alt(stcb, asoc, net);
7890                                 }
7891                                 *reason_code = 6;
7892                                 /*-
7893                                  * I add this line to be paranoid. As far as
7894                                  * I can tell the continue, takes us back to
7895                                  * the top of the for, but just to make sure
7896                                  * I will reset these again here.
7897                                  */
7898                                 ctl_cnt = bundle_at = 0;
7899                                 continue;       /* This takes us back to the
7900                                                  * for() for the nets. */
7901                         } else {
7902                                 asoc->ifp_had_enobuf = 0;
7903                         }
7904                         outchain = endoutchain = NULL;
7905                         auth = NULL;
7906                         auth_offset = 0;
7907                         if (bundle_at || hbflag) {
7908                                 /* For data/asconf and hb set time */
7909                                 if (*now_filled == 0) {
7910                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7911                                         *now_filled = 1;
7912                                         *now = net->last_sent_time;
7913                                 } else {
7914                                         net->last_sent_time = *now;
7915                                 }
7916                         }
7917                         if (!no_out_cnt) {
7918                                 *num_out += (ctl_cnt + bundle_at);
7919                         }
7920                         if (bundle_at) {
7921                                 /* setup for a RTO measurement */
7922                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
7923                                 /* fill time if not already filled */
7924                                 if (*now_filled == 0) {
7925                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
7926                                         *now_filled = 1;
7927                                         *now = asoc->time_last_sent;
7928                                 } else {
7929                                         asoc->time_last_sent = *now;
7930                                 }
7931                                 data_list[0]->do_rtt = 1;
7932                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
7933                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
7934                                 if (sctp_early_fr) {
7935                                         if (net->flight_size < net->cwnd) {
7936                                                 /* start or restart it */
7937                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
7938                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
7939                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
7940                                                 }
7941                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
7942                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
7943                                         } else {
7944                                                 /* stop it if its running */
7945                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
7946                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
7947                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
7948                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
7949                                                 }
7950                                         }
7951                                 }
7952                         }
7953                         if (one_chunk) {
7954                                 break;
7955                         }
7956                 }
7957                 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7958                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
7959                 }
7960         }
7961         if (old_startat == NULL) {
7962                 old_startat = send_start_at;
7963                 send_start_at = TAILQ_FIRST(&asoc->nets);
7964                 if (old_startat)
7965                         goto again_one_more_time;
7966         }
7967         /*
7968          * At the end there should be no NON timed chunks hanging on this
7969          * queue.
7970          */
7971         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
7972                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
7973         }
7974         if ((*num_out == 0) && (*reason_code == 0)) {
7975                 *reason_code = 4;
7976         } else {
7977                 *reason_code = 5;
7978         }
7979         sctp_clean_up_ctl(stcb, asoc);
7980         return (0);
7981 }
7982
7983 void
7984 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
7985 {
7986         /*-
7987          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
7988          * the control chunk queue.
7989          */
7990         struct sctp_chunkhdr *hdr;
7991         struct sctp_tmit_chunk *chk;
7992         struct mbuf *mat;
7993
7994         SCTP_TCB_LOCK_ASSERT(stcb);
7995         sctp_alloc_a_chunk(stcb, chk);
7996         if (chk == NULL) {
7997                 /* no memory */
7998                 sctp_m_freem(op_err);
7999                 return;
8000         }
8001         chk->copy_by_ref = 0;
8002         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8003         if (op_err == NULL) {
8004                 sctp_free_a_chunk(stcb, chk);
8005                 return;
8006         }
8007         chk->send_size = 0;
8008         mat = op_err;
8009         while (mat != NULL) {
8010                 chk->send_size += SCTP_BUF_LEN(mat);
8011                 mat = SCTP_BUF_NEXT(mat);
8012         }
8013         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8014         chk->rec.chunk_id.can_take_data = 1;
8015         chk->sent = SCTP_DATAGRAM_UNSENT;
8016         chk->snd_count = 0;
8017         chk->flags = 0;
8018         chk->asoc = &stcb->asoc;
8019         chk->data = op_err;
8020         chk->whoTo = chk->asoc->primary_destination;
8021         atomic_add_int(&chk->whoTo->ref_count, 1);
8022         hdr = mtod(op_err, struct sctp_chunkhdr *);
8023         hdr->chunk_type = SCTP_OPERATION_ERROR;
8024         hdr->chunk_flags = 0;
8025         hdr->chunk_length = htons(chk->send_size);
8026         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8027             chk,
8028             sctp_next);
8029         chk->asoc->ctrl_queue_cnt++;
8030 }
8031
8032 int
8033 sctp_send_cookie_echo(struct mbuf *m,
8034     int offset,
8035     struct sctp_tcb *stcb,
8036     struct sctp_nets *net)
8037 {
8038         /*-
8039          * pull out the cookie and put it at the front of the control chunk
8040          * queue.
8041          */
8042         int at;
8043         struct mbuf *cookie;
8044         struct sctp_paramhdr parm, *phdr;
8045         struct sctp_chunkhdr *hdr;
8046         struct sctp_tmit_chunk *chk;
8047         uint16_t ptype, plen;
8048
8049         /* First find the cookie in the param area */
8050         cookie = NULL;
8051         at = offset + sizeof(struct sctp_init_chunk);
8052
8053         SCTP_TCB_LOCK_ASSERT(stcb);
8054         do {
8055                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8056                 if (phdr == NULL) {
8057                         return (-3);
8058                 }
8059                 ptype = ntohs(phdr->param_type);
8060                 plen = ntohs(phdr->param_length);
8061                 if (ptype == SCTP_STATE_COOKIE) {
8062                         int pad;
8063
8064                         /* found the cookie */
8065                         if ((pad = (plen % 4))) {
8066                                 plen += 4 - pad;
8067                         }
8068                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8069                         if (cookie == NULL) {
8070                                 /* No memory */
8071                                 return (-2);
8072                         }
8073 #ifdef SCTP_MBUF_LOGGING
8074                         if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
8075                                 struct mbuf *mat;
8076
8077                                 mat = cookie;
8078                                 while (mat) {
8079                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8080                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8081                                         }
8082                                         mat = SCTP_BUF_NEXT(mat);
8083                                 }
8084                         }
8085 #endif
8086                         break;
8087                 }
8088                 at += SCTP_SIZE32(plen);
8089         } while (phdr);
8090         if (cookie == NULL) {
8091                 /* Did not find the cookie */
8092                 return (-3);
8093         }
8094         /* ok, we got the cookie lets change it into a cookie echo chunk */
8095
8096         /* first the change from param to cookie */
8097         hdr = mtod(cookie, struct sctp_chunkhdr *);
8098         hdr->chunk_type = SCTP_COOKIE_ECHO;
8099         hdr->chunk_flags = 0;
8100         /* get the chunk stuff now and place it in the FRONT of the queue */
8101         sctp_alloc_a_chunk(stcb, chk);
8102         if (chk == NULL) {
8103                 /* no memory */
8104                 sctp_m_freem(cookie);
8105                 return (-5);
8106         }
8107         chk->copy_by_ref = 0;
8108         chk->send_size = plen;
8109         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8110         chk->rec.chunk_id.can_take_data = 0;
8111         chk->sent = SCTP_DATAGRAM_UNSENT;
8112         chk->snd_count = 0;
8113         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8114         chk->asoc = &stcb->asoc;
8115         chk->data = cookie;
8116         chk->whoTo = chk->asoc->primary_destination;
8117         atomic_add_int(&chk->whoTo->ref_count, 1);
8118         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8119         chk->asoc->ctrl_queue_cnt++;
8120         return (0);
8121 }
8122
8123 void
8124 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8125     struct mbuf *m,
8126     int offset,
8127     int chk_length,
8128     struct sctp_nets *net)
8129 {
8130         /*
8131          * take a HB request and make it into a HB ack and send it.
8132          */
8133         struct mbuf *outchain;
8134         struct sctp_chunkhdr *chdr;
8135         struct sctp_tmit_chunk *chk;
8136
8137
8138         if (net == NULL)
8139                 /* must have a net pointer */
8140                 return;
8141
8142         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8143         if (outchain == NULL) {
8144                 /* gak out of memory */
8145                 return;
8146         }
8147 #ifdef SCTP_MBUF_LOGGING
8148         if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
8149                 struct mbuf *mat;
8150
8151                 mat = outchain;
8152                 while (mat) {
8153                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8154                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8155                         }
8156                         mat = SCTP_BUF_NEXT(mat);
8157                 }
8158         }
8159 #endif
8160         chdr = mtod(outchain, struct sctp_chunkhdr *);
8161         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8162         chdr->chunk_flags = 0;
8163         if (chk_length % 4) {
8164                 /* need pad */
8165                 uint32_t cpthis = 0;
8166                 int padlen;
8167
8168                 padlen = 4 - (chk_length % 4);
8169                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8170         }
8171         sctp_alloc_a_chunk(stcb, chk);
8172         if (chk == NULL) {
8173                 /* no memory */
8174                 sctp_m_freem(outchain);
8175                 return;
8176         }
8177         chk->copy_by_ref = 0;
8178         chk->send_size = chk_length;
8179         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8180         chk->rec.chunk_id.can_take_data = 1;
8181         chk->sent = SCTP_DATAGRAM_UNSENT;
8182         chk->snd_count = 0;
8183         chk->flags = 0;
8184         chk->asoc = &stcb->asoc;
8185         chk->data = outchain;
8186         chk->whoTo = net;
8187         atomic_add_int(&chk->whoTo->ref_count, 1);
8188         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8189         chk->asoc->ctrl_queue_cnt++;
8190 }
8191
8192 void
8193 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8194 {
8195         /* formulate and queue a cookie-ack back to sender */
8196         struct mbuf *cookie_ack;
8197         struct sctp_chunkhdr *hdr;
8198         struct sctp_tmit_chunk *chk;
8199
8200         cookie_ack = NULL;
8201         SCTP_TCB_LOCK_ASSERT(stcb);
8202
8203         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8204         if (cookie_ack == NULL) {
8205                 /* no mbuf's */
8206                 return;
8207         }
8208         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8209         sctp_alloc_a_chunk(stcb, chk);
8210         if (chk == NULL) {
8211                 /* no memory */
8212                 sctp_m_freem(cookie_ack);
8213                 return;
8214         }
8215         chk->copy_by_ref = 0;
8216         chk->send_size = sizeof(struct sctp_chunkhdr);
8217         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8218         chk->rec.chunk_id.can_take_data = 1;
8219         chk->sent = SCTP_DATAGRAM_UNSENT;
8220         chk->snd_count = 0;
8221         chk->flags = 0;
8222         chk->asoc = &stcb->asoc;
8223         chk->data = cookie_ack;
8224         if (chk->asoc->last_control_chunk_from != NULL) {
8225                 chk->whoTo = chk->asoc->last_control_chunk_from;
8226         } else {
8227                 chk->whoTo = chk->asoc->primary_destination;
8228         }
8229         atomic_add_int(&chk->whoTo->ref_count, 1);
8230         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8231         hdr->chunk_type = SCTP_COOKIE_ACK;
8232         hdr->chunk_flags = 0;
8233         hdr->chunk_length = htons(chk->send_size);
8234         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8235         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8236         chk->asoc->ctrl_queue_cnt++;
8237         return;
8238 }
8239
8240
8241 void
8242 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8243 {
8244         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8245         struct mbuf *m_shutdown_ack;
8246         struct sctp_shutdown_ack_chunk *ack_cp;
8247         struct sctp_tmit_chunk *chk;
8248
8249         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8250         if (m_shutdown_ack == NULL) {
8251                 /* no mbuf's */
8252                 return;
8253         }
8254         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8255         sctp_alloc_a_chunk(stcb, chk);
8256         if (chk == NULL) {
8257                 /* no memory */
8258                 sctp_m_freem(m_shutdown_ack);
8259                 return;
8260         }
8261         chk->copy_by_ref = 0;
8262         chk->send_size = sizeof(struct sctp_chunkhdr);
8263         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8264         chk->rec.chunk_id.can_take_data = 1;
8265         chk->sent = SCTP_DATAGRAM_UNSENT;
8266         chk->snd_count = 0;
8267         chk->flags = 0;
8268         chk->asoc = &stcb->asoc;
8269         chk->data = m_shutdown_ack;
8270         chk->whoTo = net;
8271         atomic_add_int(&net->ref_count, 1);
8272
8273         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8274         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8275         ack_cp->ch.chunk_flags = 0;
8276         ack_cp->ch.chunk_length = htons(chk->send_size);
8277         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8278         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8279         chk->asoc->ctrl_queue_cnt++;
8280         return;
8281 }
8282
8283 void
8284 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8285 {
8286         /* formulate and queue a SHUTDOWN to the sender */
8287         struct mbuf *m_shutdown;
8288         struct sctp_shutdown_chunk *shutdown_cp;
8289         struct sctp_tmit_chunk *chk;
8290
8291         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8292         if (m_shutdown == NULL) {
8293                 /* no mbuf's */
8294                 return;
8295         }
8296         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8297         sctp_alloc_a_chunk(stcb, chk);
8298         if (chk == NULL) {
8299                 /* no memory */
8300                 sctp_m_freem(m_shutdown);
8301                 return;
8302         }
8303         chk->copy_by_ref = 0;
8304         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8305         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8306         chk->rec.chunk_id.can_take_data = 1;
8307         chk->sent = SCTP_DATAGRAM_UNSENT;
8308         chk->snd_count = 0;
8309         chk->flags = 0;
8310         chk->asoc = &stcb->asoc;
8311         chk->data = m_shutdown;
8312         chk->whoTo = net;
8313         atomic_add_int(&net->ref_count, 1);
8314
8315         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8316         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8317         shutdown_cp->ch.chunk_flags = 0;
8318         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8319         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8320         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8321         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8322         chk->asoc->ctrl_queue_cnt++;
8323         return;
8324 }
8325
8326 void
8327 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8328 {
8329         /*
8330          * formulate and queue an ASCONF to the peer. ASCONF parameters
8331          * should be queued on the assoc queue.
8332          */
8333         struct sctp_tmit_chunk *chk;
8334         struct mbuf *m_asconf;
8335         struct sctp_asconf_chunk *acp;
8336         int len;
8337
8338         SCTP_TCB_LOCK_ASSERT(stcb);
8339         /* compose an ASCONF chunk, maximum length is PMTU */
8340         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8341         if (m_asconf == NULL) {
8342                 return;
8343         }
8344         acp = mtod(m_asconf, struct sctp_asconf_chunk *);
8345         sctp_alloc_a_chunk(stcb, chk);
8346         if (chk == NULL) {
8347                 /* no memory */
8348                 sctp_m_freem(m_asconf);
8349                 return;
8350         }
8351         chk->copy_by_ref = 0;
8352         chk->data = m_asconf;
8353         chk->send_size = len;
8354         chk->rec.chunk_id.id = SCTP_ASCONF;
8355         chk->rec.chunk_id.can_take_data = 0;
8356         chk->sent = SCTP_DATAGRAM_UNSENT;
8357         chk->snd_count = 0;
8358         chk->flags = 0;
8359         chk->asoc = &stcb->asoc;
8360         chk->whoTo = chk->asoc->primary_destination;
8361         atomic_add_int(&chk->whoTo->ref_count, 1);
8362         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8363         chk->asoc->ctrl_queue_cnt++;
8364         return;
8365 }
8366
8367 void
8368 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8369 {
8370         /*
8371          * formulate and queue a asconf-ack back to sender. the asconf-ack
8372          * must be stored in the tcb.
8373          */
8374         struct sctp_tmit_chunk *chk;
8375         struct sctp_asconf_ack *ack, *latest_ack;
8376         struct mbuf *m_ack, *m;
8377         struct sctp_nets *net = NULL;
8378
8379         SCTP_TCB_LOCK_ASSERT(stcb);
8380         /* Get the latest ASCONF-ACK */
8381         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8382         if (latest_ack == NULL) {
8383                 return;
8384         }
8385         if (latest_ack->last_sent_to != NULL &&
8386             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8387                 /* we're doing a retransmission */
8388                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8389                 if (net == NULL) {
8390                         /* no alternate */
8391                         if (stcb->asoc.last_control_chunk_from == NULL)
8392                                 net = stcb->asoc.primary_destination;
8393                         else
8394                                 net = stcb->asoc.last_control_chunk_from;
8395                 }
8396         } else {
8397                 /* normal case */
8398                 if (stcb->asoc.last_control_chunk_from == NULL)
8399                         net = stcb->asoc.primary_destination;
8400                 else
8401                         net = stcb->asoc.last_control_chunk_from;
8402         }
8403         latest_ack->last_sent_to = net;
8404
8405         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8406                 if (ack->data == NULL) {
8407                         continue;
8408                 }
8409                 /* copy the asconf_ack */
8410                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8411                 if (m_ack == NULL) {
8412                         /* couldn't copy it */
8413                         return;
8414                 }
8415 #ifdef SCTP_MBUF_LOGGING
8416                 if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
8417                         struct mbuf *mat;
8418
8419                         mat = m_ack;
8420                         while (mat) {
8421                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8422                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8423                                 }
8424                                 mat = SCTP_BUF_NEXT(mat);
8425                         }
8426                 }
8427 #endif
8428
8429                 sctp_alloc_a_chunk(stcb, chk);
8430                 if (chk == NULL) {
8431                         /* no memory */
8432                         if (m_ack)
8433                                 sctp_m_freem(m_ack);
8434                         return;
8435                 }
8436                 chk->copy_by_ref = 0;
8437
8438                 chk->whoTo = net;
8439                 chk->data = m_ack;
8440                 chk->send_size = 0;
8441                 /* Get size */
8442                 m = m_ack;
8443                 chk->send_size = ack->len;
8444                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8445                 chk->rec.chunk_id.can_take_data = 1;
8446                 chk->sent = SCTP_DATAGRAM_UNSENT;
8447                 chk->snd_count = 0;
8448                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8449                 chk->asoc = &stcb->asoc;
8450                 atomic_add_int(&chk->whoTo->ref_count, 1);
8451
8452                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8453                 chk->asoc->ctrl_queue_cnt++;
8454         }
8455         return;
8456 }
8457
8458
8459 static int
8460 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8461     struct sctp_tcb *stcb,
8462     struct sctp_association *asoc,
8463     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8464 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8465     SCTP_UNUSED
8466 #endif
8467 )
8468 {
8469         /*-
8470          * send out one MTU of retransmission. If fast_retransmit is
8471          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8472          * rwnd. For a Cookie or Asconf in the control chunk queue we
8473          * retransmit them by themselves.
8474          *
8475          * For data chunks we will pick out the lowest TSN's in the sent_queue
8476          * marked for resend and bundle them all together (up to a MTU of
8477          * destination). The address to send to should have been
8478          * selected/changed where the retransmission was marked (i.e. in FR
8479          * or t3-timeout routines).
8480          */
8481         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8482         struct sctp_tmit_chunk *chk, *fwd;
8483         struct mbuf *m, *endofchain;
8484         struct sctphdr *shdr;
8485         int asconf;
8486         struct sctp_nets *net = NULL;
8487         uint32_t tsns_sent = 0;
8488         int no_fragmentflg, bundle_at, cnt_thru;
8489         unsigned int mtu;
8490         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8491         struct sctp_auth_chunk *auth = NULL;
8492         uint32_t auth_offset = 0;
8493         uint32_t dmtu = 0;
8494
8495         SCTP_TCB_LOCK_ASSERT(stcb);
8496         tmr_started = ctl_cnt = bundle_at = error = 0;
8497         no_fragmentflg = 1;
8498         asconf = 0;
8499         fwd_tsn = 0;
8500         *cnt_out = 0;
8501         fwd = NULL;
8502         endofchain = m = NULL;
8503 #ifdef SCTP_AUDITING_ENABLED
8504         sctp_audit_log(0xC3, 1);
8505 #endif
8506         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8507             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8508                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8509                     asoc->sent_queue_retran_cnt);
8510                 asoc->sent_queue_cnt = 0;
8511                 asoc->sent_queue_cnt_removeable = 0;
8512                 /* send back 0/0 so we enter normal transmission */
8513                 *cnt_out = 0;
8514                 return (0);
8515         }
8516         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8517                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8518                     (chk->rec.chunk_id.id == SCTP_ASCONF) ||
8519                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8520                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8521                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8522                                 if (chk != asoc->str_reset) {
8523                                         /*
8524                                          * not eligible for retran if its
8525                                          * not ours
8526                                          */
8527                                         continue;
8528                                 }
8529                         }
8530                         ctl_cnt++;
8531                         if (chk->rec.chunk_id.id == SCTP_ASCONF) {
8532                                 no_fragmentflg = 1;
8533                                 asconf = 1;
8534                         }
8535                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8536                                 fwd_tsn = 1;
8537                                 fwd = chk;
8538                         }
8539                         /*
8540                          * Add an AUTH chunk, if chunk requires it save the
8541                          * offset into the chain for AUTH
8542                          */
8543                         if ((auth == NULL) &&
8544                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8545                             stcb->asoc.peer_auth_chunks))) {
8546                                 m = sctp_add_auth_chunk(m, &endofchain,
8547                                     &auth, &auth_offset,
8548                                     stcb,
8549                                     chk->rec.chunk_id.id);
8550                         }
8551                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8552                         break;
8553                 }
8554         }
8555         one_chunk = 0;
8556         cnt_thru = 0;
8557         /* do we have control chunks to retransmit? */
8558         if (m != NULL) {
8559                 /* Start a timer no matter if we suceed or fail */
8560                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8561                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8562                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8563                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8564
8565                 SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
8566                 if (m == NULL) {
8567                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8568                         return (ENOBUFS);
8569                 }
8570                 shdr = mtod(m, struct sctphdr *);
8571                 shdr->src_port = inp->sctp_lport;
8572                 shdr->dest_port = stcb->rport;
8573                 shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8574                 shdr->checksum = 0;
8575                 auth_offset += sizeof(struct sctphdr);
8576                 chk->snd_count++;       /* update our count */
8577
8578                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8579                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m, auth_offset,
8580                     auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
8581                         SCTP_STAT_INCR(sctps_lowlevelerr);
8582                         return (error);
8583                 }
8584                 m = endofchain = NULL;
8585                 auth = NULL;
8586                 auth_offset = 0;
8587                 /*
8588                  * We don't want to mark the net->sent time here since this
8589                  * we use this for HB and retrans cannot measure RTT
8590                  */
8591                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8592                 *cnt_out += 1;
8593                 chk->sent = SCTP_DATAGRAM_SENT;
8594                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8595                 if (fwd_tsn == 0) {
8596                         return (0);
8597                 } else {
8598                         /* Clean up the fwd-tsn list */
8599                         sctp_clean_up_ctl(stcb, asoc);
8600                         return (0);
8601                 }
8602         }
8603         /*
8604          * Ok, it is just data retransmission we need to do or that and a
8605          * fwd-tsn with it all.
8606          */
8607         if (TAILQ_EMPTY(&asoc->sent_queue)) {
8608                 return (SCTP_RETRAN_DONE);
8609         }
8610         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
8611             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
8612                 /* not yet open, resend the cookie and that is it */
8613                 return (1);
8614         }
8615 #ifdef SCTP_AUDITING_ENABLED
8616         sctp_auditing(20, inp, stcb, NULL);
8617 #endif
8618         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
8619                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
8620                         /* No, not sent to this net or not ready for rtx */
8621                         continue;
8622                 }
8623                 if ((sctp_max_retran_chunk) && (chk->snd_count >= sctp_max_retran_chunk)) {
8624                         /* Gak, we have exceeded max unlucky retran, abort! */
8625                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
8626                             chk->snd_count,
8627                             sctp_max_retran_chunk);
8628                         atomic_add_int(&stcb->asoc.refcnt, 1);
8629                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
8630                         SCTP_TCB_LOCK(stcb);
8631                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
8632                         return (SCTP_RETRAN_EXIT);
8633                 }
8634                 /* pick up the net */
8635                 net = chk->whoTo;
8636                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8637                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8638                 } else {
8639                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8640                 }
8641
8642                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
8643                         /* No room in peers rwnd */
8644                         uint32_t tsn;
8645
8646                         tsn = asoc->last_acked_seq + 1;
8647                         if (tsn == chk->rec.data.TSN_seq) {
8648                                 /*
8649                                  * we make a special exception for this
8650                                  * case. The peer has no rwnd but is missing
8651                                  * the lowest chunk.. which is probably what
8652                                  * is holding up the rwnd.
8653                                  */
8654                                 goto one_chunk_around;
8655                         }
8656                         return (1);
8657                 }
8658 one_chunk_around:
8659                 if (asoc->peers_rwnd < mtu) {
8660                         one_chunk = 1;
8661                         if ((asoc->peers_rwnd == 0) &&
8662                             (asoc->total_flight == 0)) {
8663                                 chk->window_probe = 1;
8664                                 chk->whoTo->window_probe = 1;
8665                         }
8666                 }
8667 #ifdef SCTP_AUDITING_ENABLED
8668                 sctp_audit_log(0xC3, 2);
8669 #endif
8670                 bundle_at = 0;
8671                 m = NULL;
8672                 net->fast_retran_ip = 0;
8673                 if (chk->rec.data.doing_fast_retransmit == 0) {
8674                         /*
8675                          * if no FR in progress skip destination that have
8676                          * flight_size > cwnd.
8677                          */
8678                         if (net->flight_size >= net->cwnd) {
8679                                 continue;
8680                         }
8681                 } else {
8682                         /*
8683                          * Mark the destination net to have FR recovery
8684                          * limits put on it.
8685                          */
8686                         *fr_done = 1;
8687                         net->fast_retran_ip = 1;
8688                 }
8689
8690                 /*
8691                  * if no AUTH is yet included and this chunk requires it,
8692                  * make sure to account for it.  We don't apply the size
8693                  * until the AUTH chunk is actually added below in case
8694                  * there is no room for this chunk.
8695                  */
8696                 if ((auth == NULL) &&
8697                     sctp_auth_is_required_chunk(SCTP_DATA,
8698                     stcb->asoc.peer_auth_chunks)) {
8699                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8700                 } else
8701                         dmtu = 0;
8702
8703                 if ((chk->send_size <= (mtu - dmtu)) ||
8704                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8705                         /* ok we will add this one */
8706                         if ((auth == NULL) &&
8707                             (sctp_auth_is_required_chunk(SCTP_DATA,
8708                             stcb->asoc.peer_auth_chunks))) {
8709                                 m = sctp_add_auth_chunk(m, &endofchain,
8710                                     &auth, &auth_offset,
8711                                     stcb, SCTP_DATA);
8712                         }
8713                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8714                         if (m == NULL) {
8715                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8716                                 return (ENOMEM);
8717                         }
8718                         /* Do clear IP_DF ? */
8719                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8720                                 no_fragmentflg = 0;
8721                         }
8722                         /* upate our MTU size */
8723                         if (mtu > (chk->send_size + dmtu))
8724                                 mtu -= (chk->send_size + dmtu);
8725                         else
8726                                 mtu = 0;
8727                         data_list[bundle_at++] = chk;
8728                         if (one_chunk && (asoc->total_flight <= 0)) {
8729                                 SCTP_STAT_INCR(sctps_windowprobed);
8730                         }
8731                 }
8732                 if (one_chunk == 0) {
8733                         /*
8734                          * now are there anymore forward from chk to pick
8735                          * up?
8736                          */
8737                         fwd = TAILQ_NEXT(chk, sctp_next);
8738                         while (fwd) {
8739                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
8740                                         /* Nope, not for retran */
8741                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8742                                         continue;
8743                                 }
8744                                 if (fwd->whoTo != net) {
8745                                         /* Nope, not the net in question */
8746                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8747                                         continue;
8748                                 }
8749                                 if ((auth == NULL) &&
8750                                     sctp_auth_is_required_chunk(SCTP_DATA,
8751                                     stcb->asoc.peer_auth_chunks)) {
8752                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8753                                 } else
8754                                         dmtu = 0;
8755                                 if (fwd->send_size <= (mtu - dmtu)) {
8756                                         if ((auth == NULL) &&
8757                                             (sctp_auth_is_required_chunk(SCTP_DATA,
8758                                             stcb->asoc.peer_auth_chunks))) {
8759                                                 m = sctp_add_auth_chunk(m,
8760                                                     &endofchain,
8761                                                     &auth, &auth_offset,
8762                                                     stcb,
8763                                                     SCTP_DATA);
8764                                         }
8765                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
8766                                         if (m == NULL) {
8767                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8768                                                 return (ENOMEM);
8769                                         }
8770                                         /* Do clear IP_DF ? */
8771                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8772                                                 no_fragmentflg = 0;
8773                                         }
8774                                         /* upate our MTU size */
8775                                         if (mtu > (fwd->send_size + dmtu))
8776                                                 mtu -= (fwd->send_size + dmtu);
8777                                         else
8778                                                 mtu = 0;
8779                                         data_list[bundle_at++] = fwd;
8780                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8781                                                 break;
8782                                         }
8783                                         fwd = TAILQ_NEXT(fwd, sctp_next);
8784                                 } else {
8785                                         /* can't fit so we are done */
8786                                         break;
8787                                 }
8788                         }
8789                 }
8790                 /* Is there something to send for this destination? */
8791                 if (m) {
8792                         /*
8793                          * No matter if we fail/or suceed we should start a
8794                          * timer. A failure is like a lost IP packet :-)
8795                          */
8796                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8797                                 /*
8798                                  * no timer running on this destination
8799                                  * restart it.
8800                                  */
8801                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8802                                 tmr_started = 1;
8803                         }
8804                         SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
8805                         if (m == NULL) {
8806                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8807                                 return (ENOBUFS);
8808                         }
8809                         shdr = mtod(m, struct sctphdr *);
8810                         shdr->src_port = inp->sctp_lport;
8811                         shdr->dest_port = stcb->rport;
8812                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8813                         shdr->checksum = 0;
8814                         auth_offset += sizeof(struct sctphdr);
8815                         /* Now lets send it, if there is anything to send :> */
8816                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8817                             (struct sockaddr *)&net->ro._l_addr, m, auth_offset,
8818                             auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
8819                                 /* error, we could not output */
8820                                 SCTP_STAT_INCR(sctps_lowlevelerr);
8821                                 return (error);
8822                         }
8823                         m = endofchain = NULL;
8824                         auth = NULL;
8825                         auth_offset = 0;
8826                         /* For HB's */
8827                         /*
8828                          * We don't want to mark the net->sent time here
8829                          * since this we use this for HB and retrans cannot
8830                          * measure RTT
8831                          */
8832                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
8833
8834                         /* For auto-close */
8835                         cnt_thru++;
8836                         if (*now_filled == 0) {
8837                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8838                                 *now = asoc->time_last_sent;
8839                                 *now_filled = 1;
8840                         } else {
8841                                 asoc->time_last_sent = *now;
8842                         }
8843                         *cnt_out += bundle_at;
8844 #ifdef SCTP_AUDITING_ENABLED
8845                         sctp_audit_log(0xC4, bundle_at);
8846 #endif
8847                         if (bundle_at) {
8848                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8849                         }
8850                         for (i = 0; i < bundle_at; i++) {
8851                                 SCTP_STAT_INCR(sctps_sendretransdata);
8852                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
8853                                 /*
8854                                  * When we have a revoked data, and we
8855                                  * retransmit it, then we clear the revoked
8856                                  * flag since this flag dictates if we
8857                                  * subtracted from the fs
8858                                  */
8859                                 if (data_list[i]->rec.data.chunk_was_revoked) {
8860                                         /* Deflate the cwnd */
8861                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
8862                                         data_list[i]->rec.data.chunk_was_revoked = 0;
8863                                 }
8864                                 data_list[i]->snd_count++;
8865                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8866                                 /* record the time */
8867                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
8868                                 if (data_list[i]->book_size_scale) {
8869                                         /*
8870                                          * need to double the book size on
8871                                          * this one
8872                                          */
8873                                         data_list[i]->book_size_scale = 0;
8874                                         /*
8875                                          * Since we double the booksize, we
8876                                          * must also double the output queue
8877                                          * size, since this get shrunk when
8878                                          * we free by this amount.
8879                                          */
8880                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
8881                                         data_list[i]->book_size *= 2;
8882
8883
8884                                 } else {
8885                                         if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
8886                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
8887                                                     asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
8888                                         }
8889                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
8890                                             (uint32_t) (data_list[i]->send_size +
8891                                             sctp_peer_chunk_oh));
8892                                 }
8893                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
8894                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
8895                                             data_list[i]->whoTo->flight_size,
8896                                             data_list[i]->book_size,
8897                                             (uintptr_t) data_list[i]->whoTo,
8898                                             data_list[i]->rec.data.TSN_seq);
8899                                 }
8900                                 sctp_flight_size_increase(data_list[i]);
8901                                 sctp_total_flight_increase(stcb, data_list[i]);
8902                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
8903                                         /* SWS sender side engages */
8904                                         asoc->peers_rwnd = 0;
8905                                 }
8906                                 if ((i == 0) &&
8907                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
8908                                         SCTP_STAT_INCR(sctps_sendfastretrans);
8909                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
8910                                             (tmr_started == 0)) {
8911                                                 /*-
8912                                                  * ok we just fast-retrans'd
8913                                                  * the lowest TSN, i.e the
8914                                                  * first on the list. In
8915                                                  * this case we want to give
8916                                                  * some more time to get a
8917                                                  * SACK back without a
8918                                                  * t3-expiring.
8919                                                  */
8920                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
8921                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
8922                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8923                                         }
8924                                 }
8925                         }
8926                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
8927                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
8928                         }
8929 #ifdef SCTP_AUDITING_ENABLED
8930                         sctp_auditing(21, inp, stcb, NULL);
8931 #endif
8932                 } else {
8933                         /* None will fit */
8934                         return (1);
8935                 }
8936                 if (asoc->sent_queue_retran_cnt <= 0) {
8937                         /* all done we have no more to retran */
8938                         asoc->sent_queue_retran_cnt = 0;
8939                         break;
8940                 }
8941                 if (one_chunk) {
8942                         /* No more room in rwnd */
8943                         return (1);
8944                 }
8945                 /* stop the for loop here. we sent out a packet */
8946                 break;
8947         }
8948         return (0);
8949 }
8950
8951
8952 static int
8953 sctp_timer_validation(struct sctp_inpcb *inp,
8954     struct sctp_tcb *stcb,
8955     struct sctp_association *asoc,
8956     int ret)
8957 {
8958         struct sctp_nets *net;
8959
8960         /* Validate that a timer is running somewhere */
8961         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
8962                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8963                         /* Here is a timer */
8964                         return (ret);
8965                 }
8966         }
8967         SCTP_TCB_LOCK_ASSERT(stcb);
8968         /* Gak, we did not have a timer somewhere */
8969         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
8970         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
8971         return (ret);
8972 }
8973
8974 void
8975 sctp_chunk_output(struct sctp_inpcb *inp,
8976     struct sctp_tcb *stcb,
8977     int from_where,
8978     int so_locked
8979 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8980     SCTP_UNUSED
8981 #endif
8982 )
8983 {
8984         /*-
8985          * Ok this is the generic chunk service queue. we must do the
8986          * following:
8987          * - See if there are retransmits pending, if so we must
8988          *   do these first.
8989          * - Service the stream queue that is next, moving any
8990          *   message (note I must get a complete message i.e.
8991          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
8992          *   TSN's
8993          * - Check to see if the cwnd/rwnd allows any output, if so we
8994          *   go ahead and fomulate and send the low level chunks. Making sure
8995          *   to combine any control in the control chunk queue also.
8996          */
8997         struct sctp_association *asoc;
8998         struct sctp_nets *net;
8999         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9000             burst_cnt = 0, burst_limit = 0;
9001         struct timeval now;
9002         int now_filled = 0;
9003         int cwnd_full = 0;
9004         int nagle_on = 0;
9005         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9006         int un_sent = 0;
9007         int fr_done, tot_frs = 0;
9008
9009         asoc = &stcb->asoc;
9010         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9011                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9012                         nagle_on = 0;
9013                 } else {
9014                         nagle_on = 1;
9015                 }
9016         }
9017         SCTP_TCB_LOCK_ASSERT(stcb);
9018
9019         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9020
9021         if ((un_sent <= 0) &&
9022             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9023             (asoc->sent_queue_retran_cnt == 0)) {
9024                 /* Nothing to do unless there is something to be sent left */
9025                 return;
9026         }
9027         /*
9028          * Do we have something to send, data or control AND a sack timer
9029          * running, if so piggy-back the sack.
9030          */
9031         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9032                 sctp_send_sack(stcb);
9033                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9034         }
9035         while (asoc->sent_queue_retran_cnt) {
9036                 /*-
9037                  * Ok, it is retransmission time only, we send out only ONE
9038                  * packet with a single call off to the retran code.
9039                  */
9040                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9041                         /*-
9042                          * Special hook for handling cookiess discarded
9043                          * by peer that carried data. Send cookie-ack only
9044                          * and then the next call with get the retran's.
9045                          */
9046                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9047                             &cwnd_full, from_where,
9048                             &now, &now_filled, frag_point, so_locked);
9049                         return;
9050                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9051                         /* if its not from a HB then do it */
9052                         fr_done = 0;
9053                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9054                         if (fr_done) {
9055                                 tot_frs++;
9056                         }
9057                 } else {
9058                         /*
9059                          * its from any other place, we don't allow retran
9060                          * output (only control)
9061                          */
9062                         ret = 1;
9063                 }
9064                 if (ret > 0) {
9065                         /* Can't send anymore */
9066                         /*-
9067                          * now lets push out control by calling med-level
9068                          * output once. this assures that we WILL send HB's
9069                          * if queued too.
9070                          */
9071                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9072                             &cwnd_full, from_where,
9073                             &now, &now_filled, frag_point, so_locked);
9074 #ifdef SCTP_AUDITING_ENABLED
9075                         sctp_auditing(8, inp, stcb, NULL);
9076 #endif
9077                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9078                         return;
9079                 }
9080                 if (ret < 0) {
9081                         /*-
9082                          * The count was off.. retran is not happening so do
9083                          * the normal retransmission.
9084                          */
9085 #ifdef SCTP_AUDITING_ENABLED
9086                         sctp_auditing(9, inp, stcb, NULL);
9087 #endif
9088                         if (ret == SCTP_RETRAN_EXIT) {
9089                                 return;
9090                         }
9091                         break;
9092                 }
9093                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9094                         /* Only one transmission allowed out of a timeout */
9095 #ifdef SCTP_AUDITING_ENABLED
9096                         sctp_auditing(10, inp, stcb, NULL);
9097 #endif
9098                         /* Push out any control */
9099                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
9100                             &now, &now_filled, frag_point, so_locked);
9101                         return;
9102                 }
9103                 if (tot_frs > asoc->max_burst) {
9104                         /* Hit FR burst limit */
9105                         return;
9106                 }
9107                 if ((num_out == 0) && (ret == 0)) {
9108
9109                         /* No more retrans to send */
9110                         break;
9111                 }
9112         }
9113 #ifdef SCTP_AUDITING_ENABLED
9114         sctp_auditing(12, inp, stcb, NULL);
9115 #endif
9116         /* Check for bad destinations, if they exist move chunks around. */
9117         burst_limit = asoc->max_burst;
9118         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9119                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9120                     SCTP_ADDR_NOT_REACHABLE) {
9121                         /*-
9122                          * if possible move things off of this address we
9123                          * still may send below due to the dormant state but
9124                          * we try to find an alternate address to send to
9125                          * and if we have one we move all queued data on the
9126                          * out wheel to this alternate address.
9127                          */
9128                         if (net->ref_count > 1)
9129                                 sctp_move_to_an_alt(stcb, asoc, net);
9130                 } else if (sctp_cmt_on_off && sctp_cmt_pf && ((net->dest_state & SCTP_ADDR_PF) ==
9131                     SCTP_ADDR_PF)) {
9132                         /*
9133                          * JRS 5/14/07 - If CMT PF is on and the current
9134                          * destination is in PF state, move all queued data
9135                          * to an alternate desination.
9136                          */
9137                         if (net->ref_count > 1)
9138                                 sctp_move_to_an_alt(stcb, asoc, net);
9139                 } else {
9140                         /*-
9141                          * if ((asoc->sat_network) || (net->addr_is_local))
9142                          * { burst_limit = asoc->max_burst *
9143                          * SCTP_SAT_NETWORK_BURST_INCR; }
9144                          */
9145                         if (sctp_use_cwnd_based_maxburst) {
9146                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9147                                         /*
9148                                          * JRS - Use the congestion control
9149                                          * given in the congestion control
9150                                          * module
9151                                          */
9152                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9153                                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
9154                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9155                                         }
9156                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9157                                 }
9158                                 net->fast_retran_ip = 0;
9159                         } else {
9160                                 if (net->flight_size == 0) {
9161                                         /* Should be decaying the cwnd here */
9162                                         ;
9163                                 }
9164                         }
9165                 }
9166
9167         }
9168         burst_cnt = 0;
9169         cwnd_full = 0;
9170         do {
9171                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9172                     &reason_code, 0, &cwnd_full, from_where,
9173                     &now, &now_filled, frag_point, so_locked);
9174                 if (error) {
9175                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9176                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
9177                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9178                         }
9179                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
9180                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9181                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9182                         }
9183                         break;
9184                 }
9185                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9186
9187                 tot_out += num_out;
9188                 burst_cnt++;
9189                 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
9190                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9191                         if (num_out == 0) {
9192                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9193                         }
9194                 }
9195                 if (nagle_on) {
9196                         /*-
9197                          * When nagle is on, we look at how much is un_sent, then
9198                          * if its smaller than an MTU and we have data in
9199                          * flight we stop.
9200                          */
9201                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9202                             ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count)
9203                             * sizeof(struct sctp_data_chunk)));
9204                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9205                             (stcb->asoc.total_flight > 0)) {
9206                                 break;
9207                         }
9208                 }
9209                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9210                     TAILQ_EMPTY(&asoc->send_queue) &&
9211                     TAILQ_EMPTY(&asoc->out_wheel)) {
9212                         /* Nothing left to send */
9213                         break;
9214                 }
9215                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9216                         /* Nothing left to send */
9217                         break;
9218                 }
9219         } while (num_out && (sctp_use_cwnd_based_maxburst ||
9220             (burst_cnt < burst_limit)));
9221
9222         if (sctp_use_cwnd_based_maxburst == 0) {
9223                 if (burst_cnt >= burst_limit) {
9224                         SCTP_STAT_INCR(sctps_maxburstqueued);
9225                         asoc->burst_limit_applied = 1;
9226                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
9227                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9228                         }
9229                 } else {
9230                         asoc->burst_limit_applied = 0;
9231                 }
9232         }
9233         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
9234                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9235         }
9236         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9237             tot_out);
9238
9239         /*-
9240          * Now we need to clean up the control chunk chain if a ECNE is on
9241          * it. It must be marked as UNSENT again so next call will continue
9242          * to send it until such time that we get a CWR, to remove it.
9243          */
9244         if (stcb->asoc.ecn_echo_cnt_onq)
9245                 sctp_fix_ecn_echo(asoc);
9246         return;
9247 }
9248
9249
9250 int
9251 sctp_output(inp, m, addr, control, p, flags)
9252         struct sctp_inpcb *inp;
9253         struct mbuf *m;
9254         struct sockaddr *addr;
9255         struct mbuf *control;
9256         struct thread *p;
9257         int flags;
9258 {
9259         if (inp == NULL) {
9260                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9261                 return (EINVAL);
9262         }
9263         if (inp->sctp_socket == NULL) {
9264                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9265                 return (EINVAL);
9266         }
9267         return (sctp_sosend(inp->sctp_socket,
9268             addr,
9269             (struct uio *)NULL,
9270             m,
9271             control,
9272             flags, p
9273             ));
9274 }
9275
9276 void
9277 send_forward_tsn(struct sctp_tcb *stcb,
9278     struct sctp_association *asoc)
9279 {
9280         struct sctp_tmit_chunk *chk;
9281         struct sctp_forward_tsn_chunk *fwdtsn;
9282
9283         SCTP_TCB_LOCK_ASSERT(stcb);
9284         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9285                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9286                         /* mark it to unsent */
9287                         chk->sent = SCTP_DATAGRAM_UNSENT;
9288                         chk->snd_count = 0;
9289                         /* Do we correct its output location? */
9290                         if (chk->whoTo != asoc->primary_destination) {
9291                                 sctp_free_remote_addr(chk->whoTo);
9292                                 chk->whoTo = asoc->primary_destination;
9293                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9294                         }
9295                         goto sctp_fill_in_rest;
9296                 }
9297         }
9298         /* Ok if we reach here we must build one */
9299         sctp_alloc_a_chunk(stcb, chk);
9300         if (chk == NULL) {
9301                 return;
9302         }
9303         chk->copy_by_ref = 0;
9304         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9305         chk->rec.chunk_id.can_take_data = 0;
9306         chk->asoc = asoc;
9307         chk->whoTo = NULL;
9308
9309         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9310         if (chk->data == NULL) {
9311                 sctp_free_a_chunk(stcb, chk);
9312                 return;
9313         }
9314         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9315         chk->sent = SCTP_DATAGRAM_UNSENT;
9316         chk->snd_count = 0;
9317         chk->whoTo = asoc->primary_destination;
9318         atomic_add_int(&chk->whoTo->ref_count, 1);
9319         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9320         asoc->ctrl_queue_cnt++;
9321 sctp_fill_in_rest:
9322         /*-
9323          * Here we go through and fill out the part that deals with
9324          * stream/seq of the ones we skip.
9325          */
9326         SCTP_BUF_LEN(chk->data) = 0;
9327         {
9328                 struct sctp_tmit_chunk *at, *tp1, *last;
9329                 struct sctp_strseq *strseq;
9330                 unsigned int cnt_of_space, i, ovh;
9331                 unsigned int space_needed;
9332                 unsigned int cnt_of_skipped = 0;
9333
9334                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9335                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9336                                 /* no more to look at */
9337                                 break;
9338                         }
9339                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9340                                 /* We don't report these */
9341                                 continue;
9342                         }
9343                         cnt_of_skipped++;
9344                 }
9345                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9346                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9347
9348                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9349
9350                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9351                         ovh = SCTP_MIN_OVERHEAD;
9352                 } else {
9353                         ovh = SCTP_MIN_V4_OVERHEAD;
9354                 }
9355                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9356                         /* trim to a mtu size */
9357                         cnt_of_space = asoc->smallest_mtu - ovh;
9358                 }
9359                 if (cnt_of_space < space_needed) {
9360                         /*-
9361                          * ok we must trim down the chunk by lowering the
9362                          * advance peer ack point.
9363                          */
9364                         cnt_of_skipped = (cnt_of_space -
9365                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9366                             sizeof(struct sctp_strseq)));
9367                         /*-
9368                          * Go through and find the TSN that will be the one
9369                          * we report.
9370                          */
9371                         at = TAILQ_FIRST(&asoc->sent_queue);
9372                         for (i = 0; i < cnt_of_skipped; i++) {
9373                                 tp1 = TAILQ_NEXT(at, sctp_next);
9374                                 at = tp1;
9375                         }
9376                         last = at;
9377                         /*-
9378                          * last now points to last one I can report, update
9379                          * peer ack point
9380                          */
9381                         asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
9382                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9383                 }
9384                 chk->send_size = space_needed;
9385                 /* Setup the chunk */
9386                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9387                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9388                 fwdtsn->ch.chunk_flags = 0;
9389                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9390                 fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
9391                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9392                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9393                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9394                 fwdtsn++;
9395                 /*-
9396                  * Move pointer to after the fwdtsn and transfer to the
9397                  * strseq pointer.
9398                  */
9399                 strseq = (struct sctp_strseq *)fwdtsn;
9400                 /*-
9401                  * Now populate the strseq list. This is done blindly
9402                  * without pulling out duplicate stream info. This is
9403                  * inefficent but won't harm the process since the peer will
9404                  * look at these in sequence and will thus release anything.
9405                  * It could mean we exceed the PMTU and chop off some that
9406                  * we could have included.. but this is unlikely (aka 1432/4
9407                  * would mean 300+ stream seq's would have to be reported in
9408                  * one FWD-TSN. With a bit of work we can later FIX this to
9409                  * optimize and pull out duplcates.. but it does add more
9410                  * overhead. So for now... not!
9411                  */
9412                 at = TAILQ_FIRST(&asoc->sent_queue);
9413                 for (i = 0; i < cnt_of_skipped; i++) {
9414                         tp1 = TAILQ_NEXT(at, sctp_next);
9415                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9416                                 /* We don't report these */
9417                                 i--;
9418                                 at = tp1;
9419                                 continue;
9420                         }
9421                         strseq->stream = ntohs(at->rec.data.stream_number);
9422                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9423                         strseq++;
9424                         at = tp1;
9425                 }
9426         }
9427         return;
9428
9429 }
9430
9431 void
9432 sctp_send_sack(struct sctp_tcb *stcb)
9433 {
9434         /*-
9435          * Queue up a SACK in the control queue. We must first check to see
9436          * if a SACK is somehow on the control queue. If so, we will take
9437          * and and remove the old one.
9438          */
9439         struct sctp_association *asoc;
9440         struct sctp_tmit_chunk *chk, *a_chk;
9441         struct sctp_sack_chunk *sack;
9442         struct sctp_gap_ack_block *gap_descriptor;
9443         struct sack_track *selector;
9444         int mergeable = 0;
9445         int offset;
9446         caddr_t limit;
9447         uint32_t *dup;
9448         int limit_reached = 0;
9449         unsigned int i, jstart, siz, j;
9450         unsigned int num_gap_blocks = 0, space;
9451         int num_dups = 0;
9452         int space_req;
9453
9454         a_chk = NULL;
9455         asoc = &stcb->asoc;
9456         SCTP_TCB_LOCK_ASSERT(stcb);
9457         if (asoc->last_data_chunk_from == NULL) {
9458                 /* Hmm we never received anything */
9459                 return;
9460         }
9461         sctp_set_rwnd(stcb, asoc);
9462         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9463                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9464                         /* Hmm, found a sack already on queue, remove it */
9465                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9466                         asoc->ctrl_queue_cnt++;
9467                         a_chk = chk;
9468                         if (a_chk->data) {
9469                                 sctp_m_freem(a_chk->data);
9470                                 a_chk->data = NULL;
9471                         }
9472                         sctp_free_remote_addr(a_chk->whoTo);
9473                         a_chk->whoTo = NULL;
9474                         break;
9475                 }
9476         }
9477         if (a_chk == NULL) {
9478                 sctp_alloc_a_chunk(stcb, a_chk);
9479                 if (a_chk == NULL) {
9480                         /* No memory so we drop the idea, and set a timer */
9481                         if (stcb->asoc.delayed_ack) {
9482                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9483                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9484                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9485                                     stcb->sctp_ep, stcb, NULL);
9486                         } else {
9487                                 stcb->asoc.send_sack = 1;
9488                         }
9489                         return;
9490                 }
9491                 a_chk->copy_by_ref = 0;
9492                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9493                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9494                 a_chk->rec.chunk_id.can_take_data = 1;
9495         }
9496         /* Clear our pkt counts */
9497         asoc->data_pkts_seen = 0;
9498
9499         a_chk->asoc = asoc;
9500         a_chk->snd_count = 0;
9501         a_chk->send_size = 0;   /* fill in later */
9502         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9503         a_chk->whoTo = NULL;
9504
9505         if ((asoc->numduptsns) ||
9506             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9507             ) {
9508                 /*-
9509                  * Ok, we have some duplicates or the destination for the
9510                  * sack is unreachable, lets see if we can select an
9511                  * alternate than asoc->last_data_chunk_from
9512                  */
9513                 if ((!(asoc->last_data_chunk_from->dest_state &
9514                     SCTP_ADDR_NOT_REACHABLE)) &&
9515                     (asoc->used_alt_onsack > asoc->numnets)) {
9516                         /* We used an alt last time, don't this time */
9517                         a_chk->whoTo = NULL;
9518                 } else {
9519                         asoc->used_alt_onsack++;
9520                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9521                 }
9522                 if (a_chk->whoTo == NULL) {
9523                         /* Nope, no alternate */
9524                         a_chk->whoTo = asoc->last_data_chunk_from;
9525                         asoc->used_alt_onsack = 0;
9526                 }
9527         } else {
9528                 /*
9529                  * No duplicates so we use the last place we received data
9530                  * from.
9531                  */
9532                 asoc->used_alt_onsack = 0;
9533                 a_chk->whoTo = asoc->last_data_chunk_from;
9534         }
9535         if (a_chk->whoTo) {
9536                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9537         }
9538         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
9539                 /* no gaps */
9540                 space_req = sizeof(struct sctp_sack_chunk);
9541         } else {
9542                 /* gaps get a cluster */
9543                 space_req = MCLBYTES;
9544         }
9545         /* Ok now lets formulate a MBUF with our sack */
9546         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9547         if ((a_chk->data == NULL) ||
9548             (a_chk->whoTo == NULL)) {
9549                 /* rats, no mbuf memory */
9550                 if (a_chk->data) {
9551                         /* was a problem with the destination */
9552                         sctp_m_freem(a_chk->data);
9553                         a_chk->data = NULL;
9554                 }
9555                 sctp_free_a_chunk(stcb, a_chk);
9556                 /* sa_ignore NO_NULL_CHK */
9557                 if (stcb->asoc.delayed_ack) {
9558                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9559                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
9560                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9561                             stcb->sctp_ep, stcb, NULL);
9562                 } else {
9563                         stcb->asoc.send_sack = 1;
9564                 }
9565                 return;
9566         }
9567         /* ok, lets go through and fill it in */
9568         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
9569         space = M_TRAILINGSPACE(a_chk->data);
9570         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
9571                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
9572         }
9573         limit = mtod(a_chk->data, caddr_t);
9574         limit += space;
9575
9576         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
9577         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
9578         /* 0x01 is used by nonce for ecn */
9579         if ((sctp_ecn_enable) &&
9580             (sctp_ecn_nonce) &&
9581             (asoc->peer_supports_ecn_nonce))
9582                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
9583         else
9584                 sack->ch.chunk_flags = 0;
9585
9586         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
9587                 /*-
9588                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
9589                  * received, then set high bit to 1, else 0. Reset
9590                  * pkts_rcvd.
9591                  */
9592                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
9593                 asoc->cmt_dac_pkts_rcvd = 0;
9594         }
9595 #ifdef SCTP_ASOCLOG_OF_TSNS
9596         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
9597         stcb->asoc.cumack_log_atsnt++;
9598         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
9599                 stcb->asoc.cumack_log_atsnt = 0;
9600         }
9601 #endif
9602         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
9603         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
9604         asoc->my_last_reported_rwnd = asoc->my_rwnd;
9605
9606         /* reset the readers interpretation */
9607         stcb->freed_by_sorcv_sincelast = 0;
9608
9609         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
9610
9611         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
9612         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
9613                 offset = 1;
9614                 /*-
9615                  * cum-ack behind the mapping array, so we start and use all
9616                  * entries.
9617                  */
9618                 jstart = 0;
9619         } else {
9620                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
9621                 /*-
9622                  * we skip the first one when the cum-ack is at or above the
9623                  * mapping array base. Note this only works if
9624                  */
9625                 jstart = 1;
9626         }
9627         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
9628                 /* we have a gap .. maybe */
9629                 for (i = 0; i < siz; i++) {
9630                         selector = &sack_array[asoc->mapping_array[i]];
9631                         if (mergeable && selector->right_edge) {
9632                                 /*
9633                                  * Backup, left and right edges were ok to
9634                                  * merge.
9635                                  */
9636                                 num_gap_blocks--;
9637                                 gap_descriptor--;
9638                         }
9639                         if (selector->num_entries == 0)
9640                                 mergeable = 0;
9641                         else {
9642                                 for (j = jstart; j < selector->num_entries; j++) {
9643                                         if (mergeable && selector->right_edge) {
9644                                                 /*
9645                                                  * do a merge by NOT setting
9646                                                  * the left side
9647                                                  */
9648                                                 mergeable = 0;
9649                                         } else {
9650                                                 /*
9651                                                  * no merge, set the left
9652                                                  * side
9653                                                  */
9654                                                 mergeable = 0;
9655                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
9656                                         }
9657                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
9658                                         num_gap_blocks++;
9659                                         gap_descriptor++;
9660                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
9661                                                 /* no more room */
9662                                                 limit_reached = 1;
9663                                                 break;
9664                                         }
9665                                 }
9666                                 if (selector->left_edge) {
9667                                         mergeable = 1;
9668                                 }
9669                         }
9670                         if (limit_reached) {
9671                                 /* Reached the limit stop */
9672                                 break;
9673                         }
9674                         jstart = 0;
9675                         offset += 8;
9676                 }
9677                 if (num_gap_blocks == 0) {
9678                         /*
9679                          * slide not yet happened, and somehow we got called
9680                          * to send a sack. Cumack needs to move up.
9681                          */
9682                         int abort_flag = 0;
9683
9684                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
9685                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
9686                         sctp_sack_check(stcb, 0, 0, &abort_flag);
9687                 }
9688         }
9689         /* now we must add any dups we are going to report. */
9690         if ((limit_reached == 0) && (asoc->numduptsns)) {
9691                 dup = (uint32_t *) gap_descriptor;
9692                 for (i = 0; i < asoc->numduptsns; i++) {
9693                         *dup = htonl(asoc->dup_tsns[i]);
9694                         dup++;
9695                         num_dups++;
9696                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
9697                                 /* no more room */
9698                                 break;
9699                         }
9700                 }
9701                 asoc->numduptsns = 0;
9702         }
9703         /*
9704          * now that the chunk is prepared queue it to the control chunk
9705          * queue.
9706          */
9707         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
9708             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
9709             (num_dups * sizeof(int32_t)));
9710         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
9711         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
9712         sack->sack.num_dup_tsns = htons(num_dups);
9713         sack->ch.chunk_length = htons(a_chk->send_size);
9714         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
9715         asoc->ctrl_queue_cnt++;
9716         asoc->send_sack = 0;
9717         SCTP_STAT_INCR(sctps_sendsacks);
9718         return;
9719 }
9720
9721
9722 void
9723 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
9724 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9725     SCTP_UNUSED
9726 #endif
9727 )
9728 {
9729         struct mbuf *m_abort;
9730         struct mbuf *m_out = NULL, *m_end = NULL;
9731         struct sctp_abort_chunk *abort = NULL;
9732         int sz;
9733         uint32_t auth_offset = 0;
9734         struct sctp_auth_chunk *auth = NULL;
9735         struct sctphdr *shdr;
9736
9737         /*-
9738          * Add an AUTH chunk, if chunk requires it and save the offset into
9739          * the chain for AUTH
9740          */
9741         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
9742             stcb->asoc.peer_auth_chunks)) {
9743                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
9744                     stcb, SCTP_ABORT_ASSOCIATION);
9745         }
9746         SCTP_TCB_LOCK_ASSERT(stcb);
9747         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9748         if (m_abort == NULL) {
9749                 /* no mbuf's */
9750                 if (m_out)
9751                         sctp_m_freem(m_out);
9752                 return;
9753         }
9754         /* link in any error */
9755         SCTP_BUF_NEXT(m_abort) = operr;
9756         sz = 0;
9757         if (operr) {
9758                 struct mbuf *n;
9759
9760                 n = operr;
9761                 while (n) {
9762                         sz += SCTP_BUF_LEN(n);
9763                         n = SCTP_BUF_NEXT(n);
9764                 }
9765         }
9766         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
9767         if (m_out == NULL) {
9768                 /* NO Auth chunk prepended, so reserve space in front */
9769                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
9770                 m_out = m_abort;
9771         } else {
9772                 /* Put AUTH chunk at the front of the chain */
9773                 SCTP_BUF_NEXT(m_end) = m_abort;
9774         }
9775
9776         /* fill in the ABORT chunk */
9777         abort = mtod(m_abort, struct sctp_abort_chunk *);
9778         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
9779         abort->ch.chunk_flags = 0;
9780         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
9781
9782         /* prepend and fill in the SCTP header */
9783         SCTP_BUF_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
9784         if (m_out == NULL) {
9785                 /* TSNH: no memory */
9786                 return;
9787         }
9788         shdr = mtod(m_out, struct sctphdr *);
9789         shdr->src_port = stcb->sctp_ep->sctp_lport;
9790         shdr->dest_port = stcb->rport;
9791         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
9792         shdr->checksum = 0;
9793         auth_offset += sizeof(struct sctphdr);
9794
9795         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
9796             stcb->asoc.primary_destination,
9797             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
9798             m_out, auth_offset, auth, 1, 0, NULL, 0, so_locked);
9799         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9800 }
9801
9802 void
9803 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
9804     struct sctp_nets *net)
9805 {
9806         /* formulate and SEND a SHUTDOWN-COMPLETE */
9807         struct mbuf *m_shutdown_comp;
9808         struct sctp_shutdown_complete_msg *comp_cp;
9809
9810         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 0, M_DONTWAIT, 1, MT_HEADER);
9811         if (m_shutdown_comp == NULL) {
9812                 /* no mbuf's */
9813                 return;
9814         }
9815         comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
9816         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
9817         comp_cp->shut_cmp.ch.chunk_flags = 0;
9818         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
9819         comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
9820         comp_cp->sh.dest_port = stcb->rport;
9821         comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
9822         comp_cp->sh.checksum = 0;
9823
9824         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
9825         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
9826             (struct sockaddr *)&net->ro._l_addr,
9827             m_shutdown_comp, 0, NULL, 1, 0, NULL, 0, SCTP_SO_NOT_LOCKED);
9828         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9829         return;
9830 }
9831
9832 void
9833 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
9834     uint32_t vrf_id)
9835 {
9836         /* formulate and SEND a SHUTDOWN-COMPLETE */
9837         struct mbuf *o_pak;
9838         struct mbuf *mout;
9839         struct ip *iph, *iph_out;
9840
9841 #ifdef INET6
9842         struct ip6_hdr *ip6, *ip6_out;
9843
9844 #endif
9845         int offset_out, len, mlen;
9846         struct sctp_shutdown_complete_msg *comp_cp;
9847
9848         /* Get room for the largest message */
9849 #ifdef INET6
9850         len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
9851 #else
9852         len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
9853 #endif
9854         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
9855         if (mout == NULL) {
9856                 return;
9857         }
9858         SCTP_BUF_LEN(mout) = len;
9859         iph = mtod(m, struct ip *);
9860         iph_out = NULL;
9861 #ifdef INET6
9862         ip6_out = NULL;
9863 #endif
9864         offset_out = 0;
9865         switch (iph->ip_v) {
9866         case IPVERSION:
9867                 SCTP_BUF_LEN(mout) = sizeof(struct ip) +
9868                     sizeof(struct sctp_shutdown_complete_msg);
9869                 SCTP_BUF_NEXT(mout) = NULL;
9870                 iph_out = mtod(mout, struct ip *);
9871
9872                 /* Fill in the IP header for the ABORT */
9873                 iph_out->ip_v = IPVERSION;
9874                 iph_out->ip_hl = (sizeof(struct ip) / 4);
9875                 iph_out->ip_tos = (u_char)0;
9876                 iph_out->ip_id = 0;
9877                 iph_out->ip_off = 0;
9878                 iph_out->ip_ttl = MAXTTL;
9879                 iph_out->ip_p = IPPROTO_SCTP;
9880                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
9881                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
9882
9883                 /* let IP layer calculate this */
9884                 iph_out->ip_sum = 0;
9885                 offset_out += sizeof(*iph_out);
9886                 comp_cp = (struct sctp_shutdown_complete_msg *)(
9887                     (caddr_t)iph_out + offset_out);
9888                 break;
9889 #ifdef INET6
9890         case IPV6_VERSION >> 4:
9891                 ip6 = (struct ip6_hdr *)iph;
9892                 SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr) +
9893                     sizeof(struct sctp_shutdown_complete_msg);
9894                 SCTP_BUF_NEXT(mout) = NULL;
9895                 ip6_out = mtod(mout, struct ip6_hdr *);
9896
9897                 /* Fill in the IPv6 header for the ABORT */
9898                 ip6_out->ip6_flow = ip6->ip6_flow;
9899                 ip6_out->ip6_hlim = ip6_defhlim;
9900                 ip6_out->ip6_nxt = IPPROTO_SCTP;
9901                 ip6_out->ip6_src = ip6->ip6_dst;
9902                 ip6_out->ip6_dst = ip6->ip6_src;
9903                 /*
9904                  * ?? The old code had both the iph len + payload, I think
9905                  * this is wrong and would never have worked
9906                  */
9907                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
9908                 offset_out += sizeof(*ip6_out);
9909                 comp_cp = (struct sctp_shutdown_complete_msg *)(
9910                     (caddr_t)ip6_out + offset_out);
9911                 break;
9912 #endif
9913         default:
9914                 /* Currently not supported. */
9915                 return;
9916         }
9917         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
9918                 /* no mbuf's */
9919                 sctp_m_freem(mout);
9920                 return;
9921         }
9922         /* Now copy in and fill in the ABORT tags etc. */
9923         comp_cp->sh.src_port = sh->dest_port;
9924         comp_cp->sh.dest_port = sh->src_port;
9925         comp_cp->sh.checksum = 0;
9926         comp_cp->sh.v_tag = sh->v_tag;
9927         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
9928         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
9929         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
9930
9931         /* add checksum */
9932         comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
9933         if (iph_out != NULL) {
9934                 sctp_route_t ro;
9935                 int ret;
9936                 struct sctp_tcb *stcb = NULL;
9937
9938                 mlen = SCTP_BUF_LEN(mout);
9939                 bzero(&ro, sizeof ro);
9940                 /* set IPv4 length */
9941                 iph_out->ip_len = mlen;
9942 #ifdef  SCTP_PACKET_LOGGING
9943                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
9944                         sctp_packet_log(mout, mlen);
9945 #endif
9946                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
9947
9948                 /* out it goes */
9949                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
9950
9951                 /* Free the route if we got one back */
9952                 if (ro.ro_rt)
9953                         RTFREE(ro.ro_rt);
9954         }
9955 #ifdef INET6
9956         if (ip6_out != NULL) {
9957                 struct route_in6 ro;
9958                 int ret;
9959                 struct sctp_tcb *stcb = NULL;
9960                 struct ifnet *ifp = NULL;
9961
9962                 bzero(&ro, sizeof(ro));
9963                 mlen = SCTP_BUF_LEN(mout);
9964 #ifdef  SCTP_PACKET_LOGGING
9965                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
9966                         sctp_packet_log(mout, mlen);
9967 #endif
9968                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
9969                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
9970
9971                 /* Free the route if we got one back */
9972                 if (ro.ro_rt)
9973                         RTFREE(ro.ro_rt);
9974         }
9975 #endif
9976         SCTP_STAT_INCR(sctps_sendpackets);
9977         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
9978         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9979         return;
9980
9981 }
9982
9983 static struct sctp_nets *
9984 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
9985 {
9986         struct sctp_nets *net, *hnet;
9987         int ms_goneby, highest_ms, state_overide = 0;
9988
9989         (void)SCTP_GETTIME_TIMEVAL(now);
9990         highest_ms = 0;
9991         hnet = NULL;
9992         SCTP_TCB_LOCK_ASSERT(stcb);
9993         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
9994                 if (
9995                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
9996                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
9997                     ) {
9998                         /*
9999                          * Skip this guy from consideration if HB is off AND
10000                          * its confirmed
10001                          */
10002                         continue;
10003                 }
10004                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10005                         /* skip this dest net from consideration */
10006                         continue;
10007                 }
10008                 if (net->last_sent_time.tv_sec) {
10009                         /* Sent to so we subtract */
10010                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10011                 } else
10012                         /* Never been sent to */
10013                         ms_goneby = 0x7fffffff;
10014                 /*-
10015                  * When the address state is unconfirmed but still
10016                  * considered reachable, we HB at a higher rate. Once it
10017                  * goes confirmed OR reaches the "unreachable" state, thenw
10018                  * we cut it back to HB at a more normal pace.
10019                  */
10020                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10021                         state_overide = 1;
10022                 } else {
10023                         state_overide = 0;
10024                 }
10025
10026                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10027                     (ms_goneby > highest_ms)) {
10028                         highest_ms = ms_goneby;
10029                         hnet = net;
10030                 }
10031         }
10032         if (hnet &&
10033             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10034                 state_overide = 1;
10035         } else {
10036                 state_overide = 0;
10037         }
10038
10039         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10040                 /*-
10041                  * Found the one with longest delay bounds OR it is
10042                  * unconfirmed and still not marked unreachable.
10043                  */
10044                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10045 #ifdef SCTP_DEBUG
10046                 if (hnet) {
10047                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10048                             (struct sockaddr *)&hnet->ro._l_addr);
10049                 } else {
10050                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10051                 }
10052 #endif
10053                 /* update the timer now */
10054                 hnet->last_sent_time = *now;
10055                 return (hnet);
10056         }
10057         /* Nothing to HB */
10058         return (NULL);
10059 }
10060
10061 int
10062 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10063 {
10064         struct sctp_tmit_chunk *chk;
10065         struct sctp_nets *net;
10066         struct sctp_heartbeat_chunk *hb;
10067         struct timeval now;
10068         struct sockaddr_in *sin;
10069         struct sockaddr_in6 *sin6;
10070
10071         SCTP_TCB_LOCK_ASSERT(stcb);
10072         if (user_req == 0) {
10073                 net = sctp_select_hb_destination(stcb, &now);
10074                 if (net == NULL) {
10075                         /*-
10076                          * All our busy none to send to, just start the
10077                          * timer again.
10078                          */
10079                         if (stcb->asoc.state == 0) {
10080                                 return (0);
10081                         }
10082                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10083                             stcb->sctp_ep,
10084                             stcb,
10085                             net);
10086                         return (0);
10087                 }
10088         } else {
10089                 net = u_net;
10090                 if (net == NULL) {
10091                         return (0);
10092                 }
10093                 (void)SCTP_GETTIME_TIMEVAL(&now);
10094         }
10095         sin = (struct sockaddr_in *)&net->ro._l_addr;
10096         if (sin->sin_family != AF_INET) {
10097                 if (sin->sin_family != AF_INET6) {
10098                         /* huh */
10099                         return (0);
10100                 }
10101         }
10102         sctp_alloc_a_chunk(stcb, chk);
10103         if (chk == NULL) {
10104                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10105                 return (0);
10106         }
10107         chk->copy_by_ref = 0;
10108         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10109         chk->rec.chunk_id.can_take_data = 1;
10110         chk->asoc = &stcb->asoc;
10111         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10112
10113         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10114         if (chk->data == NULL) {
10115                 sctp_free_a_chunk(stcb, chk);
10116                 return (0);
10117         }
10118         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10119         SCTP_BUF_LEN(chk->data) = chk->send_size;
10120         chk->sent = SCTP_DATAGRAM_UNSENT;
10121         chk->snd_count = 0;
10122         chk->whoTo = net;
10123         atomic_add_int(&chk->whoTo->ref_count, 1);
10124         /* Now we have a mbuf that we can fill in with the details */
10125         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10126         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10127         /* fill out chunk header */
10128         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10129         hb->ch.chunk_flags = 0;
10130         hb->ch.chunk_length = htons(chk->send_size);
10131         /* Fill out hb parameter */
10132         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10133         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10134         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10135         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10136         /* Did our user request this one, put it in */
10137         hb->heartbeat.hb_info.user_req = user_req;
10138         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10139         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10140         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10141                 /*
10142                  * we only take from the entropy pool if the address is not
10143                  * confirmed.
10144                  */
10145                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10146                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10147         } else {
10148                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10149                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10150         }
10151         if (sin->sin_family == AF_INET) {
10152                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10153         } else if (sin->sin_family == AF_INET6) {
10154                 /* We leave the scope the way it is in our lookup table. */
10155                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10156                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10157         } else {
10158                 /* huh compiler bug */
10159                 return (0);
10160         }
10161
10162         /*
10163          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10164          * PF-heartbeats.  Because of this, threshold management is done by
10165          * the t3 timer handler, and does not need to be done upon the send
10166          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10167          * heartbeat is being sent is in PF state, do NOT do threshold
10168          * management.
10169          */
10170         if ((sctp_cmt_pf == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10171                 /* ok we have a destination that needs a beat */
10172                 /* lets do the theshold management Qiaobing style */
10173                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10174                     stcb->asoc.max_send_times)) {
10175                         /*-
10176                          * we have lost the association, in a way this is
10177                          * quite bad since we really are one less time since
10178                          * we really did not send yet. This is the down side
10179                          * to the Q's style as defined in the RFC and not my
10180                          * alternate style defined in the RFC.
10181                          */
10182                         if (chk->data != NULL) {
10183                                 sctp_m_freem(chk->data);
10184                                 chk->data = NULL;
10185                         }
10186                         /*
10187                          * Here we do NOT use the macro since the
10188                          * association is now gone.
10189                          */
10190                         if (chk->whoTo) {
10191                                 sctp_free_remote_addr(chk->whoTo);
10192                                 chk->whoTo = NULL;
10193                         }
10194                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10195                         return (-1);
10196                 }
10197         }
10198         net->hb_responded = 0;
10199         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10200         stcb->asoc.ctrl_queue_cnt++;
10201         SCTP_STAT_INCR(sctps_sendheartbeat);
10202         /*-
10203          * Call directly med level routine to put out the chunk. It will
10204          * always tumble out control chunks aka HB but it may even tumble
10205          * out data too.
10206          */
10207         return (1);
10208 }
10209
10210 void
10211 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10212     uint32_t high_tsn)
10213 {
10214         struct sctp_association *asoc;
10215         struct sctp_ecne_chunk *ecne;
10216         struct sctp_tmit_chunk *chk;
10217
10218         asoc = &stcb->asoc;
10219         SCTP_TCB_LOCK_ASSERT(stcb);
10220         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10221                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
10222                         /* found a previous ECN_ECHO update it if needed */
10223                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10224                         ecne->tsn = htonl(high_tsn);
10225                         return;
10226                 }
10227         }
10228         /* nope could not find one to update so we must build one */
10229         sctp_alloc_a_chunk(stcb, chk);
10230         if (chk == NULL) {
10231                 return;
10232         }
10233         chk->copy_by_ref = 0;
10234         SCTP_STAT_INCR(sctps_sendecne);
10235         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10236         chk->rec.chunk_id.can_take_data = 0;
10237         chk->asoc = &stcb->asoc;
10238         chk->send_size = sizeof(struct sctp_ecne_chunk);
10239         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10240         if (chk->data == NULL) {
10241                 sctp_free_a_chunk(stcb, chk);
10242                 return;
10243         }
10244         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10245         SCTP_BUF_LEN(chk->data) = chk->send_size;
10246         chk->sent = SCTP_DATAGRAM_UNSENT;
10247         chk->snd_count = 0;
10248         chk->whoTo = net;
10249         atomic_add_int(&chk->whoTo->ref_count, 1);
10250         stcb->asoc.ecn_echo_cnt_onq++;
10251         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10252         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10253         ecne->ch.chunk_flags = 0;
10254         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10255         ecne->tsn = htonl(high_tsn);
10256         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10257         asoc->ctrl_queue_cnt++;
10258 }
10259
10260 void
10261 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10262     struct mbuf *m, int iphlen, int bad_crc)
10263 {
10264         struct sctp_association *asoc;
10265         struct sctp_pktdrop_chunk *drp;
10266         struct sctp_tmit_chunk *chk;
10267         uint8_t *datap;
10268         int len;
10269         int was_trunc = 0;
10270         struct ip *iph;
10271
10272 #ifdef INET6
10273         struct ip6_hdr *ip6h;
10274
10275 #endif
10276         int fullsz = 0, extra = 0;
10277         long spc;
10278         int offset;
10279         struct sctp_chunkhdr *ch, chunk_buf;
10280         unsigned int chk_length;
10281
10282         if (!stcb) {
10283                 return;
10284         }
10285         asoc = &stcb->asoc;
10286         SCTP_TCB_LOCK_ASSERT(stcb);
10287         if (asoc->peer_supports_pktdrop == 0) {
10288                 /*-
10289                  * peer must declare support before I send one.
10290                  */
10291                 return;
10292         }
10293         if (stcb->sctp_socket == NULL) {
10294                 return;
10295         }
10296         sctp_alloc_a_chunk(stcb, chk);
10297         if (chk == NULL) {
10298                 return;
10299         }
10300         chk->copy_by_ref = 0;
10301         iph = mtod(m, struct ip *);
10302         if (iph == NULL) {
10303                 sctp_free_a_chunk(stcb, chk);
10304                 return;
10305         }
10306         switch (iph->ip_v) {
10307         case IPVERSION:
10308                 /* IPv4 */
10309                 len = chk->send_size = iph->ip_len;
10310                 break;
10311 #ifdef INET6
10312         case IPV6_VERSION >> 4:
10313                 /* IPv6 */
10314                 ip6h = mtod(m, struct ip6_hdr *);
10315                 len = chk->send_size = htons(ip6h->ip6_plen);
10316                 break;
10317 #endif
10318         default:
10319                 return;
10320         }
10321         /* Validate that we do not have an ABORT in here. */
10322         offset = iphlen + sizeof(struct sctphdr);
10323         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10324             sizeof(*ch), (uint8_t *) & chunk_buf);
10325         while (ch != NULL) {
10326                 chk_length = ntohs(ch->chunk_length);
10327                 if (chk_length < sizeof(*ch)) {
10328                         /* break to abort land */
10329                         break;
10330                 }
10331                 switch (ch->chunk_type) {
10332                 case SCTP_PACKET_DROPPED:
10333                 case SCTP_ABORT_ASSOCIATION:
10334                         /*-
10335                          * we don't respond with an PKT-DROP to an ABORT
10336                          * or PKT-DROP
10337                          */
10338                         sctp_free_a_chunk(stcb, chk);
10339                         return;
10340                 default:
10341                         break;
10342                 }
10343                 offset += SCTP_SIZE32(chk_length);
10344                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10345                     sizeof(*ch), (uint8_t *) & chunk_buf);
10346         }
10347
10348         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10349             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10350                 /*
10351                  * only send 1 mtu worth, trim off the excess on the end.
10352                  */
10353                 fullsz = len - extra;
10354                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10355                 was_trunc = 1;
10356         }
10357         chk->asoc = &stcb->asoc;
10358         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10359         if (chk->data == NULL) {
10360 jump_out:
10361                 sctp_free_a_chunk(stcb, chk);
10362                 return;
10363         }
10364         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10365         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10366         if (drp == NULL) {
10367                 sctp_m_freem(chk->data);
10368                 chk->data = NULL;
10369                 goto jump_out;
10370         }
10371         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10372             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10373         chk->book_size_scale = 0;
10374         if (was_trunc) {
10375                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
10376                 drp->trunc_len = htons(fullsz);
10377                 /*
10378                  * Len is already adjusted to size minus overhead above take
10379                  * out the pkt_drop chunk itself from it.
10380                  */
10381                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
10382                 len = chk->send_size;
10383         } else {
10384                 /* no truncation needed */
10385                 drp->ch.chunk_flags = 0;
10386                 drp->trunc_len = htons(0);
10387         }
10388         if (bad_crc) {
10389                 drp->ch.chunk_flags |= SCTP_BADCRC;
10390         }
10391         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
10392         SCTP_BUF_LEN(chk->data) = chk->send_size;
10393         chk->sent = SCTP_DATAGRAM_UNSENT;
10394         chk->snd_count = 0;
10395         if (net) {
10396                 /* we should hit here */
10397                 chk->whoTo = net;
10398         } else {
10399                 chk->whoTo = asoc->primary_destination;
10400         }
10401         atomic_add_int(&chk->whoTo->ref_count, 1);
10402         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
10403         chk->rec.chunk_id.can_take_data = 1;
10404         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
10405         drp->ch.chunk_length = htons(chk->send_size);
10406         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
10407         if (spc < 0) {
10408                 spc = 0;
10409         }
10410         drp->bottle_bw = htonl(spc);
10411         if (asoc->my_rwnd) {
10412                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
10413                     asoc->size_on_all_streams +
10414                     asoc->my_rwnd_control_len +
10415                     stcb->sctp_socket->so_rcv.sb_cc);
10416         } else {
10417                 /*-
10418                  * If my rwnd is 0, possibly from mbuf depletion as well as
10419                  * space used, tell the peer there is NO space aka onq == bw
10420                  */
10421                 drp->current_onq = htonl(spc);
10422         }
10423         drp->reserved = 0;
10424         datap = drp->data;
10425         m_copydata(m, iphlen, len, (caddr_t)datap);
10426         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10427         asoc->ctrl_queue_cnt++;
10428 }
10429
10430 void
10431 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
10432 {
10433         struct sctp_association *asoc;
10434         struct sctp_cwr_chunk *cwr;
10435         struct sctp_tmit_chunk *chk;
10436
10437         asoc = &stcb->asoc;
10438         SCTP_TCB_LOCK_ASSERT(stcb);
10439         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10440                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
10441                         /* found a previous ECN_CWR update it if needed */
10442                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10443                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
10444                             MAX_TSN)) {
10445                                 cwr->tsn = htonl(high_tsn);
10446                         }
10447                         return;
10448                 }
10449         }
10450         /* nope could not find one to update so we must build one */
10451         sctp_alloc_a_chunk(stcb, chk);
10452         if (chk == NULL) {
10453                 return;
10454         }
10455         chk->copy_by_ref = 0;
10456         chk->rec.chunk_id.id = SCTP_ECN_CWR;
10457         chk->rec.chunk_id.can_take_data = 1;
10458         chk->asoc = &stcb->asoc;
10459         chk->send_size = sizeof(struct sctp_cwr_chunk);
10460         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10461         if (chk->data == NULL) {
10462                 sctp_free_a_chunk(stcb, chk);
10463                 return;
10464         }
10465         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10466         SCTP_BUF_LEN(chk->data) = chk->send_size;
10467         chk->sent = SCTP_DATAGRAM_UNSENT;
10468         chk->snd_count = 0;
10469         chk->whoTo = net;
10470         atomic_add_int(&chk->whoTo->ref_count, 1);
10471         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10472         cwr->ch.chunk_type = SCTP_ECN_CWR;
10473         cwr->ch.chunk_flags = 0;
10474         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
10475         cwr->tsn = htonl(high_tsn);
10476         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10477         asoc->ctrl_queue_cnt++;
10478 }
10479
10480 void
10481 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
10482     int number_entries, uint16_t * list,
10483     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
10484 {
10485         int len, old_len, i;
10486         struct sctp_stream_reset_out_request *req_out;
10487         struct sctp_chunkhdr *ch;
10488
10489         ch = mtod(chk->data, struct sctp_chunkhdr *);
10490
10491
10492         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10493
10494         /* get to new offset for the param. */
10495         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
10496         /* now how long will this param be? */
10497         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
10498         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
10499         req_out->ph.param_length = htons(len);
10500         req_out->request_seq = htonl(seq);
10501         req_out->response_seq = htonl(resp_seq);
10502         req_out->send_reset_at_tsn = htonl(last_sent);
10503         if (number_entries) {
10504                 for (i = 0; i < number_entries; i++) {
10505                         req_out->list_of_streams[i] = htons(list[i]);
10506                 }
10507         }
10508         if (SCTP_SIZE32(len) > len) {
10509                 /*-
10510                  * Need to worry about the pad we may end up adding to the
10511                  * end. This is easy since the struct is either aligned to 4
10512                  * bytes or 2 bytes off.
10513                  */
10514                 req_out->list_of_streams[number_entries] = 0;
10515         }
10516         /* now fix the chunk length */
10517         ch->chunk_length = htons(len + old_len);
10518         chk->book_size = len + old_len;
10519         chk->book_size_scale = 0;
10520         chk->send_size = SCTP_SIZE32(chk->book_size);
10521         SCTP_BUF_LEN(chk->data) = chk->send_size;
10522         return;
10523 }
10524
10525
10526 void
10527 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
10528     int number_entries, uint16_t * list,
10529     uint32_t seq)
10530 {
10531         int len, old_len, i;
10532         struct sctp_stream_reset_in_request *req_in;
10533         struct sctp_chunkhdr *ch;
10534
10535         ch = mtod(chk->data, struct sctp_chunkhdr *);
10536
10537
10538         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10539
10540         /* get to new offset for the param. */
10541         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
10542         /* now how long will this param be? */
10543         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
10544         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
10545         req_in->ph.param_length = htons(len);
10546         req_in->request_seq = htonl(seq);
10547         if (number_entries) {
10548                 for (i = 0; i < number_entries; i++) {
10549                         req_in->list_of_streams[i] = htons(list[i]);
10550                 }
10551         }
10552         if (SCTP_SIZE32(len) > len) {
10553                 /*-
10554                  * Need to worry about the pad we may end up adding to the
10555                  * end. This is easy since the struct is either aligned to 4
10556                  * bytes or 2 bytes off.
10557                  */
10558                 req_in->list_of_streams[number_entries] = 0;
10559         }
10560         /* now fix the chunk length */
10561         ch->chunk_length = htons(len + old_len);
10562         chk->book_size = len + old_len;
10563         chk->book_size_scale = 0;
10564         chk->send_size = SCTP_SIZE32(chk->book_size);
10565         SCTP_BUF_LEN(chk->data) = chk->send_size;
10566         return;
10567 }
10568
10569
10570 void
10571 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
10572     uint32_t seq)
10573 {
10574         int len, old_len;
10575         struct sctp_stream_reset_tsn_request *req_tsn;
10576         struct sctp_chunkhdr *ch;
10577
10578         ch = mtod(chk->data, struct sctp_chunkhdr *);
10579
10580
10581         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10582
10583         /* get to new offset for the param. */
10584         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
10585         /* now how long will this param be? */
10586         len = sizeof(struct sctp_stream_reset_tsn_request);
10587         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
10588         req_tsn->ph.param_length = htons(len);
10589         req_tsn->request_seq = htonl(seq);
10590
10591         /* now fix the chunk length */
10592         ch->chunk_length = htons(len + old_len);
10593         chk->send_size = len + old_len;
10594         chk->book_size = SCTP_SIZE32(chk->send_size);
10595         chk->book_size_scale = 0;
10596         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
10597         return;
10598 }
10599
10600 void
10601 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
10602     uint32_t resp_seq, uint32_t result)
10603 {
10604         int len, old_len;
10605         struct sctp_stream_reset_response *resp;
10606         struct sctp_chunkhdr *ch;
10607
10608         ch = mtod(chk->data, struct sctp_chunkhdr *);
10609
10610
10611         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10612
10613         /* get to new offset for the param. */
10614         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
10615         /* now how long will this param be? */
10616         len = sizeof(struct sctp_stream_reset_response);
10617         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
10618         resp->ph.param_length = htons(len);
10619         resp->response_seq = htonl(resp_seq);
10620         resp->result = ntohl(result);
10621
10622         /* now fix the chunk length */
10623         ch->chunk_length = htons(len + old_len);
10624         chk->book_size = len + old_len;
10625         chk->book_size_scale = 0;
10626         chk->send_size = SCTP_SIZE32(chk->book_size);
10627         SCTP_BUF_LEN(chk->data) = chk->send_size;
10628         return;
10629
10630 }
10631
10632
10633 void
10634 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
10635     uint32_t resp_seq, uint32_t result,
10636     uint32_t send_una, uint32_t recv_next)
10637 {
10638         int len, old_len;
10639         struct sctp_stream_reset_response_tsn *resp;
10640         struct sctp_chunkhdr *ch;
10641
10642         ch = mtod(chk->data, struct sctp_chunkhdr *);
10643
10644
10645         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10646
10647         /* get to new offset for the param. */
10648         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
10649         /* now how long will this param be? */
10650         len = sizeof(struct sctp_stream_reset_response_tsn);
10651         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
10652         resp->ph.param_length = htons(len);
10653         resp->response_seq = htonl(resp_seq);
10654         resp->result = htonl(result);
10655         resp->senders_next_tsn = htonl(send_una);
10656         resp->receivers_next_tsn = htonl(recv_next);
10657
10658         /* now fix the chunk length */
10659         ch->chunk_length = htons(len + old_len);
10660         chk->book_size = len + old_len;
10661         chk->send_size = SCTP_SIZE32(chk->book_size);
10662         chk->book_size_scale = 0;
10663         SCTP_BUF_LEN(chk->data) = chk->send_size;
10664         return;
10665 }
10666
10667
10668 int
10669 sctp_send_str_reset_req(struct sctp_tcb *stcb,
10670     int number_entries, uint16_t * list,
10671     uint8_t send_out_req, uint32_t resp_seq,
10672     uint8_t send_in_req,
10673     uint8_t send_tsn_req)
10674 {
10675
10676         struct sctp_association *asoc;
10677         struct sctp_tmit_chunk *chk;
10678         struct sctp_chunkhdr *ch;
10679         uint32_t seq;
10680
10681         asoc = &stcb->asoc;
10682         if (asoc->stream_reset_outstanding) {
10683                 /*-
10684                  * Already one pending, must get ACK back to clear the flag.
10685                  */
10686                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
10687                 return (EBUSY);
10688         }
10689         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
10690                 /* nothing to do */
10691                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10692                 return (EINVAL);
10693         }
10694         if (send_tsn_req && (send_out_req || send_in_req)) {
10695                 /* error, can't do that */
10696                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10697                 return (EINVAL);
10698         }
10699         sctp_alloc_a_chunk(stcb, chk);
10700         if (chk == NULL) {
10701                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10702                 return (ENOMEM);
10703         }
10704         chk->copy_by_ref = 0;
10705         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
10706         chk->rec.chunk_id.can_take_data = 0;
10707         chk->asoc = &stcb->asoc;
10708         chk->book_size = sizeof(struct sctp_chunkhdr);
10709         chk->send_size = SCTP_SIZE32(chk->book_size);
10710         chk->book_size_scale = 0;
10711
10712         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10713         if (chk->data == NULL) {
10714                 sctp_free_a_chunk(stcb, chk);
10715                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10716                 return (ENOMEM);
10717         }
10718         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10719
10720         /* setup chunk parameters */
10721         chk->sent = SCTP_DATAGRAM_UNSENT;
10722         chk->snd_count = 0;
10723         chk->whoTo = asoc->primary_destination;
10724         atomic_add_int(&chk->whoTo->ref_count, 1);
10725
10726         ch = mtod(chk->data, struct sctp_chunkhdr *);
10727         ch->chunk_type = SCTP_STREAM_RESET;
10728         ch->chunk_flags = 0;
10729         ch->chunk_length = htons(chk->book_size);
10730         SCTP_BUF_LEN(chk->data) = chk->send_size;
10731
10732         seq = stcb->asoc.str_reset_seq_out;
10733         if (send_out_req) {
10734                 sctp_add_stream_reset_out(chk, number_entries, list,
10735                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
10736                 asoc->stream_reset_out_is_outstanding = 1;
10737                 seq++;
10738                 asoc->stream_reset_outstanding++;
10739         }
10740         if (send_in_req) {
10741                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
10742                 asoc->stream_reset_outstanding++;
10743         }
10744         if (send_tsn_req) {
10745                 sctp_add_stream_reset_tsn(chk, seq);
10746                 asoc->stream_reset_outstanding++;
10747         }
10748         asoc->str_reset = chk;
10749
10750         /* insert the chunk for sending */
10751         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
10752             chk,
10753             sctp_next);
10754         asoc->ctrl_queue_cnt++;
10755         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
10756         return (0);
10757 }
10758
10759 void
10760 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
10761     struct mbuf *err_cause, uint32_t vrf_id)
10762 {
10763         /*-
10764          * Formulate the abort message, and send it back down.
10765          */
10766         struct mbuf *o_pak;
10767         struct mbuf *mout;
10768         struct sctp_abort_msg *abm;
10769         struct ip *iph, *iph_out;
10770
10771 #ifdef INET6
10772         struct ip6_hdr *ip6, *ip6_out;
10773
10774 #endif
10775         int iphlen_out, len;
10776
10777         /* don't respond to ABORT with ABORT */
10778         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
10779                 if (err_cause)
10780                         sctp_m_freem(err_cause);
10781                 return;
10782         }
10783 #ifdef INET6
10784         len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
10785 #else
10786         len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
10787 #endif
10788         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
10789         if (mout == NULL) {
10790                 if (err_cause)
10791                         sctp_m_freem(err_cause);
10792                 return;
10793         }
10794         iph = mtod(m, struct ip *);
10795         iph_out = NULL;
10796 #ifdef INET6
10797         ip6_out = NULL;
10798 #endif
10799         switch (iph->ip_v) {
10800         case IPVERSION:
10801                 iph_out = mtod(mout, struct ip *);
10802                 SCTP_BUF_LEN(mout) = sizeof(*iph_out) + sizeof(*abm);
10803                 SCTP_BUF_NEXT(mout) = err_cause;
10804
10805                 /* Fill in the IP header for the ABORT */
10806                 iph_out->ip_v = IPVERSION;
10807                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10808                 iph_out->ip_tos = (u_char)0;
10809                 iph_out->ip_id = 0;
10810                 iph_out->ip_off = 0;
10811                 iph_out->ip_ttl = MAXTTL;
10812                 iph_out->ip_p = IPPROTO_SCTP;
10813                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10814                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10815                 /* let IP layer calculate this */
10816                 iph_out->ip_sum = 0;
10817
10818                 iphlen_out = sizeof(*iph_out);
10819                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
10820                 break;
10821 #ifdef INET6
10822         case IPV6_VERSION >> 4:
10823                 ip6 = (struct ip6_hdr *)iph;
10824                 ip6_out = mtod(mout, struct ip6_hdr *);
10825                 SCTP_BUF_LEN(mout) = sizeof(*ip6_out) + sizeof(*abm);
10826                 SCTP_BUF_NEXT(mout) = err_cause;
10827
10828                 /* Fill in the IP6 header for the ABORT */
10829                 ip6_out->ip6_flow = ip6->ip6_flow;
10830                 ip6_out->ip6_hlim = ip6_defhlim;
10831                 ip6_out->ip6_nxt = IPPROTO_SCTP;
10832                 ip6_out->ip6_src = ip6->ip6_dst;
10833                 ip6_out->ip6_dst = ip6->ip6_src;
10834
10835                 iphlen_out = sizeof(*ip6_out);
10836                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
10837                 break;
10838 #endif
10839         default:
10840                 /* Currently not supported */
10841                 if (err_cause)
10842                         sctp_m_freem(err_cause);
10843                 sctp_m_freem(mout);
10844                 return;
10845         }
10846
10847         abm->sh.src_port = sh->dest_port;
10848         abm->sh.dest_port = sh->src_port;
10849         abm->sh.checksum = 0;
10850         if (vtag == 0) {
10851                 abm->sh.v_tag = sh->v_tag;
10852                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
10853         } else {
10854                 abm->sh.v_tag = htonl(vtag);
10855                 abm->msg.ch.chunk_flags = 0;
10856         }
10857         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10858
10859         if (err_cause) {
10860                 struct mbuf *m_tmp = err_cause;
10861                 int err_len = 0;
10862
10863                 /* get length of the err_cause chain */
10864                 while (m_tmp != NULL) {
10865                         err_len += SCTP_BUF_LEN(m_tmp);
10866                         m_tmp = SCTP_BUF_NEXT(m_tmp);
10867                 }
10868                 len = SCTP_BUF_LEN(mout) + err_len;
10869                 if (err_len % 4) {
10870                         /* need pad at end of chunk */
10871                         uint32_t cpthis = 0;
10872                         int padlen;
10873
10874                         padlen = 4 - (len % 4);
10875                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
10876                         len += padlen;
10877                 }
10878                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
10879         } else {
10880                 len = SCTP_BUF_LEN(mout);
10881                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
10882         }
10883
10884         /* add checksum */
10885         abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
10886         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10887                 /* no mbuf's */
10888                 sctp_m_freem(mout);
10889                 return;
10890         }
10891         if (iph_out != NULL) {
10892                 sctp_route_t ro;
10893                 struct sctp_tcb *stcb = NULL;
10894                 int ret;
10895
10896                 /* zap the stack pointer to the route */
10897                 bzero(&ro, sizeof ro);
10898                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
10899                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
10900                 /* set IPv4 length */
10901                 iph_out->ip_len = len;
10902                 /* out it goes */
10903 #ifdef  SCTP_PACKET_LOGGING
10904                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10905                         sctp_packet_log(mout, len);
10906 #endif
10907                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10908                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10909
10910                 /* Free the route if we got one back */
10911                 if (ro.ro_rt)
10912                         RTFREE(ro.ro_rt);
10913         }
10914 #ifdef INET6
10915         if (ip6_out != NULL) {
10916                 struct route_in6 ro;
10917                 int ret;
10918                 struct sctp_tcb *stcb = NULL;
10919                 struct ifnet *ifp = NULL;
10920
10921                 /* zap the stack pointer to the route */
10922                 bzero(&ro, sizeof(ro));
10923                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
10924                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
10925                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
10926 #ifdef  SCTP_PACKET_LOGGING
10927                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10928                         sctp_packet_log(mout, len);
10929 #endif
10930                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10931                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10932
10933                 /* Free the route if we got one back */
10934                 if (ro.ro_rt)
10935                         RTFREE(ro.ro_rt);
10936         }
10937 #endif
10938         SCTP_STAT_INCR(sctps_sendpackets);
10939         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10940 }
10941
10942 void
10943 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
10944     uint32_t vrf_id)
10945 {
10946         struct mbuf *o_pak;
10947         struct sctphdr *ihdr;
10948         int retcode;
10949         struct sctphdr *ohdr;
10950         struct sctp_chunkhdr *ophdr;
10951         struct ip *iph;
10952         struct mbuf *mout;
10953
10954 #ifdef SCTP_DEBUG
10955         struct sockaddr_in6 lsa6, fsa6;
10956
10957 #endif
10958         uint32_t val;
10959         struct mbuf *at;
10960         int len;
10961
10962         iph = mtod(m, struct ip *);
10963         ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
10964
10965         SCTP_BUF_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
10966         if (scm == NULL) {
10967                 /* can't send because we can't add a mbuf */
10968                 return;
10969         }
10970         ohdr = mtod(scm, struct sctphdr *);
10971         ohdr->src_port = ihdr->dest_port;
10972         ohdr->dest_port = ihdr->src_port;
10973         ohdr->v_tag = vtag;
10974         ohdr->checksum = 0;
10975         ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
10976         ophdr->chunk_type = SCTP_OPERATION_ERROR;
10977         ophdr->chunk_flags = 0;
10978         len = 0;
10979         at = scm;
10980         while (at) {
10981                 len += SCTP_BUF_LEN(at);
10982                 at = SCTP_BUF_NEXT(at);
10983         }
10984         ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
10985         if (len % 4) {
10986                 /* need padding */
10987                 uint32_t cpthis = 0;
10988                 int padlen;
10989
10990                 padlen = 4 - (len % 4);
10991                 m_copyback(scm, len, padlen, (caddr_t)&cpthis);
10992                 len += padlen;
10993         }
10994         val = sctp_calculate_sum(scm, NULL, 0);
10995 #ifdef INET6
10996         mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
10997 #else
10998         mout = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
10999 #endif
11000         if (mout == NULL) {
11001                 sctp_m_freem(scm);
11002                 return;
11003         }
11004         SCTP_BUF_NEXT(mout) = scm;
11005         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11006                 sctp_m_freem(mout);
11007                 return;
11008         }
11009         ohdr->checksum = val;
11010         switch (iph->ip_v) {
11011         case IPVERSION:
11012                 {
11013                         /* V4 */
11014                         struct ip *out;
11015                         sctp_route_t ro;
11016                         struct sctp_tcb *stcb = NULL;
11017
11018                         SCTP_BUF_LEN(mout) = sizeof(struct ip);
11019                         len += sizeof(struct ip);
11020
11021                         bzero(&ro, sizeof ro);
11022                         out = mtod(mout, struct ip *);
11023                         out->ip_v = iph->ip_v;
11024                         out->ip_hl = (sizeof(struct ip) / 4);
11025                         out->ip_tos = iph->ip_tos;
11026                         out->ip_id = iph->ip_id;
11027                         out->ip_off = 0;
11028                         out->ip_ttl = MAXTTL;
11029                         out->ip_p = IPPROTO_SCTP;
11030                         out->ip_sum = 0;
11031                         out->ip_src = iph->ip_dst;
11032                         out->ip_dst = iph->ip_src;
11033                         out->ip_len = len;
11034 #ifdef  SCTP_PACKET_LOGGING
11035                         if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
11036                                 sctp_packet_log(mout, len);
11037 #endif
11038                         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11039
11040                         SCTP_IP_OUTPUT(retcode, o_pak, &ro, stcb, vrf_id);
11041
11042                         SCTP_STAT_INCR(sctps_sendpackets);
11043                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11044                         /* Free the route if we got one back */
11045                         if (ro.ro_rt)
11046                                 RTFREE(ro.ro_rt);
11047                         break;
11048                 }
11049 #ifdef INET6
11050         case IPV6_VERSION >> 4:
11051                 {
11052                         /* V6 */
11053                         struct route_in6 ro;
11054                         int ret;
11055                         struct sctp_tcb *stcb = NULL;
11056                         struct ifnet *ifp = NULL;
11057                         struct ip6_hdr *out6, *in6;
11058
11059                         SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr);
11060                         len += sizeof(struct ip6_hdr);
11061                         bzero(&ro, sizeof ro);
11062                         in6 = mtod(m, struct ip6_hdr *);
11063                         out6 = mtod(mout, struct ip6_hdr *);
11064                         out6->ip6_flow = in6->ip6_flow;
11065                         out6->ip6_hlim = ip6_defhlim;
11066                         out6->ip6_nxt = IPPROTO_SCTP;
11067                         out6->ip6_src = in6->ip6_dst;
11068                         out6->ip6_dst = in6->ip6_src;
11069                         out6->ip6_plen = len - sizeof(struct ip6_hdr);
11070
11071 #ifdef SCTP_DEBUG
11072                         bzero(&lsa6, sizeof(lsa6));
11073                         lsa6.sin6_len = sizeof(lsa6);
11074                         lsa6.sin6_family = AF_INET6;
11075                         lsa6.sin6_addr = out6->ip6_src;
11076                         bzero(&fsa6, sizeof(fsa6));
11077                         fsa6.sin6_len = sizeof(fsa6);
11078                         fsa6.sin6_family = AF_INET6;
11079                         fsa6.sin6_addr = out6->ip6_dst;
11080 #endif
11081                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_operr_to calling ipv6 output:\n");
11082                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "src: ");
11083                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&lsa6);
11084                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "dst ");
11085                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&fsa6);
11086
11087 #ifdef  SCTP_PACKET_LOGGING
11088                         if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
11089                                 sctp_packet_log(mout, len);
11090 #endif
11091                         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11092                         SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11093
11094                         SCTP_STAT_INCR(sctps_sendpackets);
11095                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11096                         /* Free the route if we got one back */
11097                         if (ro.ro_rt)
11098                                 RTFREE(ro.ro_rt);
11099                         break;
11100                 }
11101 #endif
11102         default:
11103                 /* TSNH */
11104                 break;
11105         }
11106 }
11107
11108 static struct mbuf *
11109 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11110     struct uio *uio,
11111     struct sctp_sndrcvinfo *srcv,
11112     int max_send_len,
11113     int user_marks_eor,
11114     int *error,
11115     uint32_t * sndout,
11116     struct mbuf **new_tail)
11117 {
11118         struct mbuf *m;
11119
11120         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11121             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11122         if (m == NULL) {
11123                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11124                 *error = ENOMEM;
11125         } else {
11126                 *sndout = m_length(m, NULL);
11127                 *new_tail = m_last(m);
11128         }
11129         return (m);
11130 }
11131
11132 static int
11133 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11134     struct uio *uio,
11135     int resv_upfront)
11136 {
11137         int left;
11138
11139         left = sp->length;
11140         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11141             resv_upfront, 0);
11142         if (sp->data == NULL) {
11143                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11144                 return (ENOMEM);
11145         }
11146         sp->tail_mbuf = m_last(sp->data);
11147         return (0);
11148 }
11149
11150
11151
11152 static struct sctp_stream_queue_pending *
11153 sctp_copy_it_in(struct sctp_tcb *stcb,
11154     struct sctp_association *asoc,
11155     struct sctp_sndrcvinfo *srcv,
11156     struct uio *uio,
11157     struct sctp_nets *net,
11158     int max_send_len,
11159     int user_marks_eor,
11160     int *error,
11161     int non_blocking)
11162 {
11163         /*-
11164          * This routine must be very careful in its work. Protocol
11165          * processing is up and running so care must be taken to spl...()
11166          * when you need to do something that may effect the stcb/asoc. The
11167          * sb is locked however. When data is copied the protocol processing
11168          * should be enabled since this is a slower operation...
11169          */
11170         struct sctp_stream_queue_pending *sp = NULL;
11171         int resv_in_first;
11172
11173         *error = 0;
11174         /* Now can we send this? */
11175         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11176             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11177             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11178             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11179                 /* got data while shutting down */
11180                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11181                 *error = ECONNRESET;
11182                 goto out_now;
11183         }
11184         sctp_alloc_a_strmoq(stcb, sp);
11185         if (sp == NULL) {
11186                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11187                 *error = ENOMEM;
11188                 goto out_now;
11189         }
11190         sp->act_flags = 0;
11191         sp->sender_all_done = 0;
11192         sp->sinfo_flags = srcv->sinfo_flags;
11193         sp->timetolive = srcv->sinfo_timetolive;
11194         sp->ppid = srcv->sinfo_ppid;
11195         sp->context = srcv->sinfo_context;
11196         sp->strseq = 0;
11197         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11198
11199         sp->stream = srcv->sinfo_stream;
11200         sp->length = min(uio->uio_resid, max_send_len);
11201         if ((sp->length == (uint32_t) uio->uio_resid) &&
11202             ((user_marks_eor == 0) ||
11203             (srcv->sinfo_flags & SCTP_EOF) ||
11204             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11205                 sp->msg_is_complete = 1;
11206         } else {
11207                 sp->msg_is_complete = 0;
11208         }
11209         sp->sender_all_done = 0;
11210         sp->some_taken = 0;
11211         sp->put_last_out = 0;
11212         resv_in_first = sizeof(struct sctp_data_chunk);
11213         sp->data = sp->tail_mbuf = NULL;
11214         *error = sctp_copy_one(sp, uio, resv_in_first);
11215         if (*error) {
11216                 sctp_free_a_strmoq(stcb, sp);
11217                 sp = NULL;
11218         } else {
11219                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
11220                         sp->net = net;
11221                         sp->addr_over = 1;
11222                 } else {
11223                         sp->net = asoc->primary_destination;
11224                         sp->addr_over = 0;
11225                 }
11226                 atomic_add_int(&sp->net->ref_count, 1);
11227                 sctp_set_prsctp_policy(stcb, sp);
11228         }
11229 out_now:
11230         return (sp);
11231 }
11232
11233
11234 int
11235 sctp_sosend(struct socket *so,
11236     struct sockaddr *addr,
11237     struct uio *uio,
11238     struct mbuf *top,
11239     struct mbuf *control,
11240     int flags,
11241     struct thread *p
11242 )
11243 {
11244         struct sctp_inpcb *inp;
11245         int error, use_rcvinfo = 0;
11246         struct sctp_sndrcvinfo srcv;
11247
11248         inp = (struct sctp_inpcb *)so->so_pcb;
11249         if (control) {
11250                 /* process cmsg snd/rcv info (maybe a assoc-id) */
11251                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
11252                     sizeof(srcv))) {
11253                         /* got one */
11254                         use_rcvinfo = 1;
11255                 }
11256         }
11257         error = sctp_lower_sosend(so, addr, uio, top,
11258             control,
11259             flags,
11260             use_rcvinfo, &srcv
11261             ,p
11262             );
11263         return (error);
11264 }
11265
11266
11267 int
11268 sctp_lower_sosend(struct socket *so,
11269     struct sockaddr *addr,
11270     struct uio *uio,
11271     struct mbuf *i_pak,
11272     struct mbuf *control,
11273     int flags,
11274     int use_rcvinfo,
11275     struct sctp_sndrcvinfo *srcv
11276     ,
11277     struct thread *p
11278 )
11279 {
11280         unsigned int sndlen = 0, max_len;
11281         int error, len;
11282         struct mbuf *top = NULL;
11283         int queue_only = 0, queue_only_for_init = 0;
11284         int free_cnt_applied = 0;
11285         int un_sent = 0;
11286         int now_filled = 0;
11287         unsigned int inqueue_bytes = 0;
11288         struct sctp_block_entry be;
11289         struct sctp_inpcb *inp;
11290         struct sctp_tcb *stcb = NULL;
11291         struct timeval now;
11292         struct sctp_nets *net;
11293         struct sctp_association *asoc;
11294         struct sctp_inpcb *t_inp;
11295         int user_marks_eor;
11296         int create_lock_applied = 0;
11297         int nagle_applies = 0;
11298         int some_on_control = 0;
11299         int got_all_of_the_send = 0;
11300         int hold_tcblock = 0;
11301         int non_blocking = 0;
11302         int temp_flags = 0;
11303         uint32_t local_add_more, local_soresv = 0;
11304
11305         error = 0;
11306         net = NULL;
11307         stcb = NULL;
11308         asoc = NULL;
11309
11310         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
11311         if (inp == NULL) {
11312                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11313                 error = EFAULT;
11314                 if (i_pak) {
11315                         SCTP_RELEASE_PKT(i_pak);
11316                 }
11317                 return (error);
11318         }
11319         if ((uio == NULL) && (i_pak == NULL)) {
11320                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11321                 return (EINVAL);
11322         }
11323         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
11324         atomic_add_int(&inp->total_sends, 1);
11325         if (uio) {
11326                 if (uio->uio_resid < 0) {
11327                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11328                         return (EINVAL);
11329                 }
11330                 sndlen = uio->uio_resid;
11331         } else {
11332                 top = SCTP_HEADER_TO_CHAIN(i_pak);
11333                 sndlen = SCTP_HEADER_LEN(i_pak);
11334         }
11335         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
11336             addr,
11337             sndlen);
11338         /*-
11339          * Pre-screen address, if one is given the sin-len
11340          * must be set correctly!
11341          */
11342         if (addr) {
11343                 if ((addr->sa_family == AF_INET) &&
11344                     (addr->sa_len != sizeof(struct sockaddr_in))) {
11345                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11346                         error = EINVAL;
11347                         goto out_unlocked;
11348                 } else if ((addr->sa_family == AF_INET6) &&
11349                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
11350                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11351                         error = EINVAL;
11352                         goto out_unlocked;
11353                 }
11354         }
11355         hold_tcblock = 0;
11356
11357         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
11358             (inp->sctp_socket->so_qlimit)) {
11359                 /* The listener can NOT send */
11360                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11361                 error = EFAULT;
11362                 goto out_unlocked;
11363         }
11364         if ((use_rcvinfo) && srcv) {
11365                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
11366                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
11367                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11368                         error = EINVAL;
11369                         goto out_unlocked;
11370                 }
11371                 if (srcv->sinfo_flags)
11372                         SCTP_STAT_INCR(sctps_sends_with_flags);
11373
11374                 if (srcv->sinfo_flags & SCTP_SENDALL) {
11375                         /* its a sendall */
11376                         error = sctp_sendall(inp, uio, top, srcv);
11377                         top = NULL;
11378                         goto out_unlocked;
11379                 }
11380         }
11381         /* now we must find the assoc */
11382         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
11383             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
11384                 SCTP_INP_RLOCK(inp);
11385                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
11386                 if (stcb == NULL) {
11387                         SCTP_INP_RUNLOCK(inp);
11388                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11389                         error = ENOTCONN;
11390                         goto out_unlocked;
11391                 }
11392                 hold_tcblock = 0;
11393                 SCTP_INP_RUNLOCK(inp);
11394                 if (addr) {
11395                         /* Must locate the net structure if addr given */
11396                         net = sctp_findnet(stcb, addr);
11397                         if (net) {
11398                                 /* validate port was 0 or correct */
11399                                 struct sockaddr_in *sin;
11400
11401                                 sin = (struct sockaddr_in *)addr;
11402                                 if ((sin->sin_port != 0) &&
11403                                     (sin->sin_port != stcb->rport)) {
11404                                         net = NULL;
11405                                 }
11406                         }
11407                         temp_flags |= SCTP_ADDR_OVER;
11408                 } else
11409                         net = stcb->asoc.primary_destination;
11410                 if (addr && (net == NULL)) {
11411                         /* Could not find address, was it legal */
11412                         if (addr->sa_family == AF_INET) {
11413                                 struct sockaddr_in *sin;
11414
11415                                 sin = (struct sockaddr_in *)addr;
11416                                 if (sin->sin_addr.s_addr == 0) {
11417                                         if ((sin->sin_port == 0) ||
11418                                             (sin->sin_port == stcb->rport)) {
11419                                                 net = stcb->asoc.primary_destination;
11420                                         }
11421                                 }
11422                         } else {
11423                                 struct sockaddr_in6 *sin6;
11424
11425                                 sin6 = (struct sockaddr_in6 *)addr;
11426                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
11427                                         if ((sin6->sin6_port == 0) ||
11428                                             (sin6->sin6_port == stcb->rport)) {
11429                                                 net = stcb->asoc.primary_destination;
11430                                         }
11431                                 }
11432                         }
11433                 }
11434                 if (net == NULL) {
11435                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11436                         error = EINVAL;
11437                         goto out_unlocked;
11438                 }
11439         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
11440                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
11441                 if (stcb) {
11442                         if (addr)
11443                                 /*
11444                                  * Must locate the net structure if addr
11445                                  * given
11446                                  */
11447                                 net = sctp_findnet(stcb, addr);
11448                         else
11449                                 net = stcb->asoc.primary_destination;
11450                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
11451                             ((net == NULL) || (addr == NULL))) {
11452                                 struct sockaddr_in *sin;
11453
11454                                 if (addr == NULL) {
11455                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11456                                         error = EINVAL;
11457                                         goto out_unlocked;
11458                                 }
11459                                 sin = (struct sockaddr_in *)addr;
11460                                 /* Validate port is 0 or correct */
11461                                 if ((sin->sin_port != 0) &&
11462                                     (sin->sin_port != stcb->rport)) {
11463                                         net = NULL;
11464                                 }
11465                         }
11466                 }
11467                 hold_tcblock = 0;
11468         } else if (addr) {
11469                 /*-
11470                  * Since we did not use findep we must
11471                  * increment it, and if we don't find a tcb
11472                  * decrement it.
11473                  */
11474                 SCTP_INP_WLOCK(inp);
11475                 SCTP_INP_INCR_REF(inp);
11476                 SCTP_INP_WUNLOCK(inp);
11477                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11478                 if (stcb == NULL) {
11479                         SCTP_INP_WLOCK(inp);
11480                         SCTP_INP_DECR_REF(inp);
11481                         SCTP_INP_WUNLOCK(inp);
11482                 } else {
11483                         hold_tcblock = 1;
11484                 }
11485         }
11486         if ((stcb == NULL) && (addr)) {
11487                 /* Possible implicit send? */
11488                 SCTP_ASOC_CREATE_LOCK(inp);
11489                 create_lock_applied = 1;
11490                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
11491                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
11492                         /* Should I really unlock ? */
11493                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11494                         error = EFAULT;
11495                         goto out_unlocked;
11496
11497                 }
11498                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
11499                     (addr->sa_family == AF_INET6)) {
11500                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11501                         error = EINVAL;
11502                         goto out_unlocked;
11503                 }
11504                 SCTP_INP_WLOCK(inp);
11505                 SCTP_INP_INCR_REF(inp);
11506                 SCTP_INP_WUNLOCK(inp);
11507                 /* With the lock applied look again */
11508                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11509                 if (stcb == NULL) {
11510                         SCTP_INP_WLOCK(inp);
11511                         SCTP_INP_DECR_REF(inp);
11512                         SCTP_INP_WUNLOCK(inp);
11513                 } else {
11514                         hold_tcblock = 1;
11515                 }
11516                 if (t_inp != inp) {
11517                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11518                         error = ENOTCONN;
11519                         goto out_unlocked;
11520                 }
11521         }
11522         if (stcb == NULL) {
11523                 if (addr == NULL) {
11524                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
11525                         error = ENOENT;
11526                         goto out_unlocked;
11527                 } else {
11528                         /*
11529                          * UDP style, we must go ahead and start the INIT
11530                          * process
11531                          */
11532                         uint32_t vrf_id;
11533
11534                         if ((use_rcvinfo) && (srcv) &&
11535                             ((srcv->sinfo_flags & SCTP_ABORT) ||
11536                             ((srcv->sinfo_flags & SCTP_EOF) &&
11537                             (sndlen == 0)))) {
11538                                 /*-
11539                                  * User asks to abort a non-existant assoc,
11540                                  * or EOF a non-existant assoc with no data
11541                                  */
11542                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
11543                                 error = ENOENT;
11544                                 goto out_unlocked;
11545                         }
11546                         /* get an asoc/stcb struct */
11547                         vrf_id = inp->def_vrf_id;
11548 #ifdef INVARIANTS
11549                         if (create_lock_applied == 0) {
11550                                 panic("Error, should hold create lock and I don't?");
11551                         }
11552 #endif
11553                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
11554                             p
11555                             );
11556                         if (stcb == NULL) {
11557                                 /* Error is setup for us in the call */
11558                                 goto out_unlocked;
11559                         }
11560                         if (create_lock_applied) {
11561                                 SCTP_ASOC_CREATE_UNLOCK(inp);
11562                                 create_lock_applied = 0;
11563                         } else {
11564                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
11565                         }
11566                         /*
11567                          * Turn on queue only flag to prevent data from
11568                          * being sent
11569                          */
11570                         queue_only = 1;
11571                         asoc = &stcb->asoc;
11572                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
11573                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
11574
11575                         /* initialize authentication params for the assoc */
11576                         sctp_initialize_auth_params(inp, stcb);
11577
11578                         if (control) {
11579                                 /*
11580                                  * see if a init structure exists in cmsg
11581                                  * headers
11582                                  */
11583                                 struct sctp_initmsg initm;
11584                                 int i;
11585
11586                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
11587                                     sizeof(initm))) {
11588                                         /*
11589                                          * we have an INIT override of the
11590                                          * default
11591                                          */
11592                                         if (initm.sinit_max_attempts)
11593                                                 asoc->max_init_times = initm.sinit_max_attempts;
11594                                         if (initm.sinit_num_ostreams)
11595                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
11596                                         if (initm.sinit_max_instreams)
11597                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
11598                                         if (initm.sinit_max_init_timeo)
11599                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
11600                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
11601                                                 /* Default is NOT correct */
11602                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
11603                                                     asoc->streamoutcnt, asoc->pre_open_streams);
11604                                                 /*
11605                                                  * What happens if this
11606                                                  * fails? we panic ...
11607                                                  */
11608                                                 {
11609                                                         struct sctp_stream_out *tmp_str;
11610                                                         int had_lock = 0;
11611
11612                                                         if (hold_tcblock) {
11613                                                                 had_lock = 1;
11614                                                                 SCTP_TCB_UNLOCK(stcb);
11615                                                         }
11616                                                         SCTP_MALLOC(tmp_str,
11617                                                             struct sctp_stream_out *,
11618                                                             (asoc->pre_open_streams *
11619                                                             sizeof(struct sctp_stream_out)),
11620                                                             SCTP_M_STRMO);
11621                                                         if (had_lock) {
11622                                                                 SCTP_TCB_LOCK(stcb);
11623                                                         }
11624                                                         if (tmp_str != NULL) {
11625                                                                 SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
11626                                                                 asoc->strmout = tmp_str;
11627                                                                 asoc->streamoutcnt = asoc->pre_open_streams;
11628                                                         } else {
11629                                                                 asoc->pre_open_streams = asoc->streamoutcnt;
11630                                                         }
11631                                                 }
11632                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
11633                                                         /*-
11634                                                          * inbound side must be set
11635                                                          * to 0xffff, also NOTE when
11636                                                          * we get the INIT-ACK back
11637                                                          * (for INIT sender) we MUST
11638                                                          * reduce the count
11639                                                          * (streamoutcnt) but first
11640                                                          * check if we sent to any
11641                                                          * of the upper streams that
11642                                                          * were dropped (if some
11643                                                          * were). Those that were
11644                                                          * dropped must be notified
11645                                                          * to the upper layer as
11646                                                          * failed to send.
11647                                                          */
11648                                                         asoc->strmout[i].next_sequence_sent = 0x0;
11649                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
11650                                                         asoc->strmout[i].stream_no = i;
11651                                                         asoc->strmout[i].last_msg_incomplete = 0;
11652                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
11653                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
11654                                                 }
11655                                         }
11656                                 }
11657                         }
11658                         hold_tcblock = 1;
11659                         /* out with the INIT */
11660                         queue_only_for_init = 1;
11661                         /*-
11662                          * we may want to dig in after this call and adjust the MTU
11663                          * value. It defaulted to 1500 (constant) but the ro
11664                          * structure may now have an update and thus we may need to
11665                          * change it BEFORE we append the message.
11666                          */
11667                         net = stcb->asoc.primary_destination;
11668                         asoc = &stcb->asoc;
11669                 }
11670         }
11671         if ((SCTP_SO_IS_NBIO(so)
11672             || (flags & MSG_NBIO)
11673             )) {
11674                 non_blocking = 1;
11675         }
11676         asoc = &stcb->asoc;
11677
11678         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
11679                 if (sndlen > asoc->smallest_mtu) {
11680                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11681                         error = EMSGSIZE;
11682                         goto out_unlocked;
11683                 }
11684         }
11685         /* would we block? */
11686         if (non_blocking) {
11687                 if (hold_tcblock == 0) {
11688                         SCTP_TCB_LOCK(stcb);
11689                         hold_tcblock = 1;
11690                 }
11691                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11692                 if ((SCTP_SB_LIMIT_SND(so) <
11693                     (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
11694                     (stcb->asoc.chunks_on_out_queue >
11695                     sctp_max_chunks_on_queue)) {
11696                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
11697                         if (sndlen > SCTP_SB_LIMIT_SND(so))
11698                                 error = EMSGSIZE;
11699                         else
11700                                 error = EWOULDBLOCK;
11701                         goto out_unlocked;
11702                 }
11703                 stcb->asoc.sb_send_resv += sndlen;
11704                 SCTP_TCB_UNLOCK(stcb);
11705                 hold_tcblock = 0;
11706         } else {
11707                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
11708         }
11709         local_soresv = sndlen;
11710         /* Keep the stcb from being freed under our feet */
11711         if (free_cnt_applied) {
11712 #ifdef INVARIANTS
11713                 panic("refcnt already incremented");
11714 #else
11715                 printf("refcnt:1 already incremented?\n");
11716 #endif
11717         } else {
11718                 atomic_add_int(&stcb->asoc.refcnt, 1);
11719                 free_cnt_applied = 1;
11720         }
11721         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11722                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11723                 error = ECONNRESET;
11724                 goto out_unlocked;
11725         }
11726         if (create_lock_applied) {
11727                 SCTP_ASOC_CREATE_UNLOCK(inp);
11728                 create_lock_applied = 0;
11729         }
11730         if (asoc->stream_reset_outstanding) {
11731                 /*
11732                  * Can't queue any data while stream reset is underway.
11733                  */
11734                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
11735                 error = EAGAIN;
11736                 goto out_unlocked;
11737         }
11738         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
11739             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
11740                 queue_only = 1;
11741         }
11742         if ((use_rcvinfo == 0) || (srcv == NULL)) {
11743                 /* Grab the default stuff from the asoc */
11744                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
11745         }
11746         /* we are now done with all control */
11747         if (control) {
11748                 sctp_m_freem(control);
11749                 control = NULL;
11750         }
11751         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11752             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11753             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11754             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11755                 if ((use_rcvinfo) &&
11756                     (srcv->sinfo_flags & SCTP_ABORT)) {
11757                         ;
11758                 } else {
11759                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11760                         error = ECONNRESET;
11761                         goto out_unlocked;
11762                 }
11763         }
11764         /* Ok, we will attempt a msgsnd :> */
11765         if (p) {
11766                 p->td_ru.ru_msgsnd++;
11767         }
11768         if (stcb) {
11769                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
11770                         net = stcb->asoc.primary_destination;
11771                 }
11772         }
11773         if (net == NULL) {
11774                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11775                 error = EINVAL;
11776                 goto out_unlocked;
11777         }
11778         if ((net->flight_size > net->cwnd) && (sctp_cmt_on_off == 0)) {
11779                 /*-
11780                  * CMT: Added check for CMT above. net above is the primary
11781                  * dest. If CMT is ON, sender should always attempt to send
11782                  * with the output routine sctp_fill_outqueue() that loops
11783                  * through all destination addresses. Therefore, if CMT is
11784                  * ON, queue_only is NOT set to 1 here, so that
11785                  * sctp_chunk_output() can be called below.
11786                  */
11787                 queue_only = 1;
11788
11789         } else if (asoc->ifp_had_enobuf) {
11790                 SCTP_STAT_INCR(sctps_ifnomemqueued);
11791                 if (net->flight_size > (net->mtu * 2))
11792                         queue_only = 1;
11793                 asoc->ifp_had_enobuf = 0;
11794         } else {
11795                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11796                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
11797         }
11798         /* Are we aborting? */
11799         if (srcv->sinfo_flags & SCTP_ABORT) {
11800                 struct mbuf *mm;
11801                 int tot_demand, tot_out = 0, max_out;
11802
11803                 SCTP_STAT_INCR(sctps_sends_with_abort);
11804                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
11805                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
11806                         /* It has to be up before we abort */
11807                         /* how big is the user initiated abort? */
11808                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11809                         error = EINVAL;
11810                         goto out;
11811                 }
11812                 if (hold_tcblock) {
11813                         SCTP_TCB_UNLOCK(stcb);
11814                         hold_tcblock = 0;
11815                 }
11816                 if (top) {
11817                         struct mbuf *cntm = NULL;
11818
11819                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
11820                         if (sndlen != 0) {
11821                                 cntm = top;
11822                                 while (cntm) {
11823                                         tot_out += SCTP_BUF_LEN(cntm);
11824                                         cntm = SCTP_BUF_NEXT(cntm);
11825                                 }
11826                         }
11827                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
11828                 } else {
11829                         /* Must fit in a MTU */
11830                         tot_out = sndlen;
11831                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
11832                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
11833                                 /* To big */
11834                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11835                                 error = EMSGSIZE;
11836                                 goto out;
11837                         }
11838                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
11839                 }
11840                 if (mm == NULL) {
11841                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11842                         error = ENOMEM;
11843                         goto out;
11844                 }
11845                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
11846                 max_out -= sizeof(struct sctp_abort_msg);
11847                 if (tot_out > max_out) {
11848                         tot_out = max_out;
11849                 }
11850                 if (mm) {
11851                         struct sctp_paramhdr *ph;
11852
11853                         /* now move forward the data pointer */
11854                         ph = mtod(mm, struct sctp_paramhdr *);
11855                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
11856                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
11857                         ph++;
11858                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
11859                         if (top == NULL) {
11860                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
11861                                 if (error) {
11862                                         /*-
11863                                          * Here if we can't get his data we
11864                                          * still abort we just don't get to
11865                                          * send the users note :-0
11866                                          */
11867                                         sctp_m_freem(mm);
11868                                         mm = NULL;
11869                                 }
11870                         } else {
11871                                 if (sndlen != 0) {
11872                                         SCTP_BUF_NEXT(mm) = top;
11873                                 }
11874                         }
11875                 }
11876                 if (hold_tcblock == 0) {
11877                         SCTP_TCB_LOCK(stcb);
11878                         hold_tcblock = 1;
11879                 }
11880                 atomic_add_int(&stcb->asoc.refcnt, -1);
11881                 free_cnt_applied = 0;
11882                 /* release this lock, otherwise we hang on ourselves */
11883                 sctp_abort_an_association(stcb->sctp_ep, stcb,
11884                     SCTP_RESPONSE_TO_USER_REQ,
11885                     mm, SCTP_SO_LOCKED);
11886                 /* now relock the stcb so everything is sane */
11887                 hold_tcblock = 0;
11888                 stcb = NULL;
11889                 /*
11890                  * In this case top is already chained to mm avoid double
11891                  * free, since we free it below if top != NULL and driver
11892                  * would free it after sending the packet out
11893                  */
11894                 if (sndlen != 0) {
11895                         top = NULL;
11896                 }
11897                 goto out_unlocked;
11898         }
11899         /* Calculate the maximum we can send */
11900         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11901         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
11902                 if (non_blocking) {
11903                         /* we already checked for non-blocking above. */
11904                         max_len = sndlen;
11905                 } else {
11906                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
11907                 }
11908         } else {
11909                 max_len = 0;
11910         }
11911         if (hold_tcblock) {
11912                 SCTP_TCB_UNLOCK(stcb);
11913                 hold_tcblock = 0;
11914         }
11915         /* Is the stream no. valid? */
11916         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
11917                 /* Invalid stream number */
11918                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11919                 error = EINVAL;
11920                 goto out_unlocked;
11921         }
11922         if (asoc->strmout == NULL) {
11923                 /* huh? software error */
11924                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11925                 error = EFAULT;
11926                 goto out_unlocked;
11927         }
11928         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
11929         if ((user_marks_eor == 0) &&
11930             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
11931                 /* It will NEVER fit */
11932                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11933                 error = EMSGSIZE;
11934                 goto out_unlocked;
11935         }
11936         if ((uio == NULL) && user_marks_eor) {
11937                 /*-
11938                  * We do not support eeor mode for
11939                  * sending with mbuf chains (like sendfile).
11940                  */
11941                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11942                 error = EINVAL;
11943                 goto out_unlocked;
11944         }
11945         if (user_marks_eor) {
11946                 local_add_more = sctp_add_more_threshold;
11947         } else {
11948                 /*-
11949                  * For non-eeor the whole message must fit in
11950                  * the socket send buffer.
11951                  */
11952                 local_add_more = sndlen;
11953         }
11954         len = 0;
11955         if (non_blocking) {
11956                 goto skip_preblock;
11957         }
11958         if (((max_len <= local_add_more) &&
11959             (SCTP_SB_LIMIT_SND(so) > local_add_more)) ||
11960             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) > sctp_max_chunks_on_queue)) {      /* if */
11961                 /* No room right no ! */
11962                 SOCKBUF_LOCK(&so->so_snd);
11963                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11964                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + sctp_add_more_threshold)) ||
11965                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) > sctp_max_chunks_on_queue /* while */ )) {
11966
11967                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11968                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA,
11969                                     so, asoc, sndlen);
11970                         }
11971                         be.error = 0;
11972                         stcb->block_entry = &be;
11973                         error = sbwait(&so->so_snd);
11974                         stcb->block_entry = NULL;
11975                         if (error || so->so_error || be.error) {
11976                                 if (error == 0) {
11977                                         if (so->so_error)
11978                                                 error = so->so_error;
11979                                         if (be.error) {
11980                                                 error = be.error;
11981                                         }
11982                                 }
11983                                 SOCKBUF_UNLOCK(&so->so_snd);
11984                                 goto out_unlocked;
11985                         }
11986                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11987                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
11988                                     so, asoc, stcb->asoc.total_output_queue_size);
11989                         }
11990                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11991                                 goto out_unlocked;
11992                         }
11993                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11994                 }
11995                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11996                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
11997                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
11998                 } else {
11999                         max_len = 0;
12000                 }
12001                 SOCKBUF_UNLOCK(&so->so_snd);
12002         }
12003 skip_preblock:
12004         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12005                 goto out_unlocked;
12006         }
12007         atomic_add_int(&stcb->total_sends, 1);
12008         /*
12009          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12010          * case NOTE: uio will be null when top/mbuf is passed
12011          */
12012         if (sndlen == 0) {
12013                 if (srcv->sinfo_flags & SCTP_EOF) {
12014                         got_all_of_the_send = 1;
12015                         goto dataless_eof;
12016                 } else {
12017                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12018                         error = EINVAL;
12019                         goto out;
12020                 }
12021         }
12022         if (top == NULL) {
12023                 struct sctp_stream_queue_pending *sp;
12024                 struct sctp_stream_out *strm;
12025                 uint32_t sndout, initial_out;
12026
12027                 initial_out = uio->uio_resid;
12028
12029                 SCTP_TCB_SEND_LOCK(stcb);
12030                 if ((asoc->stream_locked) &&
12031                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12032                         SCTP_TCB_SEND_UNLOCK(stcb);
12033                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12034                         error = EINVAL;
12035                         goto out;
12036                 }
12037                 SCTP_TCB_SEND_UNLOCK(stcb);
12038
12039                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12040                 if (strm->last_msg_incomplete == 0) {
12041         do_a_copy_in:
12042                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12043                         if ((sp == NULL) || (error)) {
12044                                 goto out;
12045                         }
12046                         SCTP_TCB_SEND_LOCK(stcb);
12047                         if (sp->msg_is_complete) {
12048                                 strm->last_msg_incomplete = 0;
12049                                 asoc->stream_locked = 0;
12050                         } else {
12051                                 /*
12052                                  * Just got locked to this guy in case of an
12053                                  * interrupt.
12054                                  */
12055                                 strm->last_msg_incomplete = 1;
12056                                 asoc->stream_locked = 1;
12057                                 asoc->stream_locked_on = srcv->sinfo_stream;
12058                                 sp->sender_all_done = 0;
12059                         }
12060                         sctp_snd_sb_alloc(stcb, sp->length);
12061                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12062                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12063                                 sp->strseq = strm->next_sequence_sent;
12064                                 if (sctp_logging_level & SCTP_LOG_AT_SEND_2_SCTP) {
12065                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12066                                             (uintptr_t) stcb, sp->length,
12067                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12068                                 }
12069                                 strm->next_sequence_sent++;
12070                         } else {
12071                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12072                         }
12073                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12074                         if ((strm->next_spoke.tqe_next == NULL) &&
12075                             (strm->next_spoke.tqe_prev == NULL)) {
12076                                 /* Not on wheel, insert */
12077                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
12078                         }
12079                         SCTP_TCB_SEND_UNLOCK(stcb);
12080                 } else {
12081                         SCTP_TCB_SEND_LOCK(stcb);
12082                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12083                         SCTP_TCB_SEND_UNLOCK(stcb);
12084                         if (sp == NULL) {
12085                                 /* ???? Huh ??? last msg is gone */
12086 #ifdef INVARIANTS
12087                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12088 #else
12089                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12090                                 strm->last_msg_incomplete = 0;
12091 #endif
12092                                 goto do_a_copy_in;
12093
12094                         }
12095                 }
12096                 while (uio->uio_resid > 0) {
12097                         /* How much room do we have? */
12098                         struct mbuf *new_tail, *mm;
12099
12100                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12101                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12102                         else
12103                                 max_len = 0;
12104
12105                         if ((max_len > sctp_add_more_threshold) ||
12106                             (max_len && (SCTP_SB_LIMIT_SND(so) < sctp_add_more_threshold)) ||
12107                             (uio->uio_resid &&
12108                             (uio->uio_resid <= (int)max_len))) {
12109                                 sndout = 0;
12110                                 new_tail = NULL;
12111                                 if (hold_tcblock) {
12112                                         SCTP_TCB_UNLOCK(stcb);
12113                                         hold_tcblock = 0;
12114                                 }
12115                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12116                                 if ((mm == NULL) || error) {
12117                                         if (mm) {
12118                                                 sctp_m_freem(mm);
12119                                         }
12120                                         goto out;
12121                                 }
12122                                 /* Update the mbuf and count */
12123                                 SCTP_TCB_SEND_LOCK(stcb);
12124                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12125                                         /*
12126                                          * we need to get out. Peer probably
12127                                          * aborted.
12128                                          */
12129                                         sctp_m_freem(mm);
12130                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12131                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12132                                                 error = ECONNRESET;
12133                                         }
12134                                         SCTP_TCB_SEND_UNLOCK(stcb);
12135                                         goto out;
12136                                 }
12137                                 if (sp->tail_mbuf) {
12138                                         /* tack it to the end */
12139                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12140                                         sp->tail_mbuf = new_tail;
12141                                 } else {
12142                                         /* A stolen mbuf */
12143                                         sp->data = mm;
12144                                         sp->tail_mbuf = new_tail;
12145                                 }
12146                                 sctp_snd_sb_alloc(stcb, sndout);
12147                                 atomic_add_int(&sp->length, sndout);
12148                                 len += sndout;
12149
12150                                 /* Did we reach EOR? */
12151                                 if ((uio->uio_resid == 0) &&
12152                                     ((user_marks_eor == 0) ||
12153                                     (srcv->sinfo_flags & SCTP_EOF) ||
12154                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
12155                                     ) {
12156                                         sp->msg_is_complete = 1;
12157                                 } else {
12158                                         sp->msg_is_complete = 0;
12159                                 }
12160                                 SCTP_TCB_SEND_UNLOCK(stcb);
12161                         }
12162                         if (uio->uio_resid == 0) {
12163                                 /* got it all? */
12164                                 continue;
12165                         }
12166                         /* PR-SCTP? */
12167                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12168                                 /*
12169                                  * This is ugly but we must assure locking
12170                                  * order
12171                                  */
12172                                 if (hold_tcblock == 0) {
12173                                         SCTP_TCB_LOCK(stcb);
12174                                         hold_tcblock = 1;
12175                                 }
12176                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12177                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12178                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12179                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12180                                 else
12181                                         max_len = 0;
12182                                 if (max_len > 0) {
12183                                         continue;
12184                                 }
12185                                 SCTP_TCB_UNLOCK(stcb);
12186                                 hold_tcblock = 0;
12187                         }
12188                         /* wait for space now */
12189                         if (non_blocking) {
12190                                 /* Non-blocking io in place out */
12191                                 goto skip_out_eof;
12192                         }
12193                         if ((net->flight_size > net->cwnd) &&
12194                             (sctp_cmt_on_off == 0)) {
12195                                 queue_only = 1;
12196                         } else if (asoc->ifp_had_enobuf) {
12197                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12198                                 if (net->flight_size > (net->mtu * 2)) {
12199                                         queue_only = 1;
12200                                 } else {
12201                                         queue_only = 0;
12202                                 }
12203                                 asoc->ifp_had_enobuf = 0;
12204                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12205                                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12206                                     sizeof(struct sctp_data_chunk)));
12207                         } else {
12208                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12209                                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12210                                     sizeof(struct sctp_data_chunk)));
12211                                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12212                                         queue_only = 1;
12213                                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12214                                 } else if (net->flight_size > net->cwnd) {
12215                                         queue_only = 1;
12216                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12217                                 } else {
12218                                         queue_only = 0;
12219                                 }
12220                         }
12221                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12222                             (stcb->asoc.total_flight > 0) &&
12223                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12224                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12225                             ) {
12226
12227                                 /*-
12228                                  * Ok, Nagle is set on and we have data outstanding.
12229                                  * Don't send anything and let SACKs drive out the
12230                                  * data unless wen have a "full" segment to send.
12231                                  */
12232                                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12233                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12234                                 }
12235                                 SCTP_STAT_INCR(sctps_naglequeued);
12236                                 nagle_applies = 1;
12237                         } else {
12238                                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12239                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12240                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12241                                 }
12242                                 SCTP_STAT_INCR(sctps_naglesent);
12243                                 nagle_applies = 0;
12244                         }
12245                         /* What about the INIT, send it maybe */
12246                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
12247
12248                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12249                                     nagle_applies, un_sent);
12250                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12251                                     stcb->asoc.total_flight,
12252                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12253                         }
12254                         if (queue_only_for_init) {
12255                                 if (hold_tcblock == 0) {
12256                                         SCTP_TCB_LOCK(stcb);
12257                                         hold_tcblock = 1;
12258                                 }
12259                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12260                                         /* a collision took us forward? */
12261                                         queue_only_for_init = 0;
12262                                         queue_only = 0;
12263                                 } else {
12264                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12265                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12266                                         queue_only_for_init = 0;
12267                                         queue_only = 1;
12268                                 }
12269                         }
12270                         if ((queue_only == 0) && (nagle_applies == 0)
12271                             ) {
12272                                 /*-
12273                                  * need to start chunk output
12274                                  * before blocking.. note that if
12275                                  * a lock is already applied, then
12276                                  * the input via the net is happening
12277                                  * and I don't need to start output :-D
12278                                  */
12279                                 if (hold_tcblock == 0) {
12280                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12281                                                 hold_tcblock = 1;
12282                                                 sctp_chunk_output(inp,
12283                                                     stcb,
12284                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12285                                         }
12286                                 } else {
12287                                         sctp_chunk_output(inp,
12288                                             stcb,
12289                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12290                                 }
12291                                 if (hold_tcblock == 1) {
12292                                         SCTP_TCB_UNLOCK(stcb);
12293                                         hold_tcblock = 0;
12294                                 }
12295                         }
12296                         SOCKBUF_LOCK(&so->so_snd);
12297                         /*-
12298                          * This is a bit strange, but I think it will
12299                          * work. The total_output_queue_size is locked and
12300                          * protected by the TCB_LOCK, which we just released.
12301                          * There is a race that can occur between releasing it
12302                          * above, and me getting the socket lock, where sacks
12303                          * come in but we have not put the SB_WAIT on the
12304                          * so_snd buffer to get the wakeup. After the LOCK
12305                          * is applied the sack_processing will also need to
12306                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12307                          * once we have the socket buffer lock if we recheck the
12308                          * size we KNOW we will get to sleep safely with the
12309                          * wakeup flag in place.
12310                          */
12311                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12312                             min(sctp_add_more_threshold, SCTP_SB_LIMIT_SND(so)))
12313                             ) {
12314                                 if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
12315                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12316                                             so, asoc, uio->uio_resid);
12317                                 }
12318                                 be.error = 0;
12319                                 stcb->block_entry = &be;
12320                                 error = sbwait(&so->so_snd);
12321                                 stcb->block_entry = NULL;
12322
12323                                 if (error || so->so_error || be.error) {
12324                                         if (error == 0) {
12325                                                 if (so->so_error)
12326                                                         error = so->so_error;
12327                                                 if (be.error) {
12328                                                         error = be.error;
12329                                                 }
12330                                         }
12331                                         SOCKBUF_UNLOCK(&so->so_snd);
12332                                         goto out_unlocked;
12333                                 }
12334                                 if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
12335                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12336                                             so, asoc, stcb->asoc.total_output_queue_size);
12337                                 }
12338                         }
12339                         SOCKBUF_UNLOCK(&so->so_snd);
12340                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12341                                 goto out_unlocked;
12342                         }
12343                 }
12344                 SCTP_TCB_SEND_LOCK(stcb);
12345                 if (sp) {
12346                         if (sp->msg_is_complete == 0) {
12347                                 strm->last_msg_incomplete = 1;
12348                                 asoc->stream_locked = 1;
12349                                 asoc->stream_locked_on = srcv->sinfo_stream;
12350                         } else {
12351                                 sp->sender_all_done = 1;
12352                                 strm->last_msg_incomplete = 0;
12353                                 asoc->stream_locked = 0;
12354                         }
12355                 } else {
12356                         SCTP_PRINTF("Huh no sp TSNH?\n");
12357                         strm->last_msg_incomplete = 0;
12358                         asoc->stream_locked = 0;
12359                 }
12360                 SCTP_TCB_SEND_UNLOCK(stcb);
12361                 if (uio->uio_resid == 0) {
12362                         got_all_of_the_send = 1;
12363                 }
12364         } else if (top) {
12365                 /* We send in a 0, since we do NOT have any locks */
12366                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12367                 top = NULL;
12368                 if (srcv->sinfo_flags & SCTP_EOF) {
12369                         /*
12370                          * This should only happen for Panda for the mbuf
12371                          * send case, which does NOT yet support EEOR mode.
12372                          * Thus, we can just set this flag to do the proper
12373                          * EOF handling.
12374                          */
12375                         got_all_of_the_send = 1;
12376                 }
12377         }
12378         if (error) {
12379                 goto out;
12380         }
12381 dataless_eof:
12382         /* EOF thing ? */
12383         if ((srcv->sinfo_flags & SCTP_EOF) &&
12384             (got_all_of_the_send == 1) &&
12385             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)
12386             ) {
12387                 int cnt;
12388
12389                 SCTP_STAT_INCR(sctps_sends_with_eof);
12390                 error = 0;
12391                 if (hold_tcblock == 0) {
12392                         SCTP_TCB_LOCK(stcb);
12393                         hold_tcblock = 1;
12394                 }
12395                 cnt = sctp_is_there_unsent_data(stcb);
12396                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12397                     TAILQ_EMPTY(&asoc->sent_queue) &&
12398                     (cnt == 0)) {
12399                         if (asoc->locked_on_sending) {
12400                                 goto abort_anyway;
12401                         }
12402                         /* there is nothing queued to send, so I'm done... */
12403                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12404                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12405                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12406                                 /* only send SHUTDOWN the first time through */
12407                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
12408                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
12409                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
12410                                 }
12411                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
12412                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
12413                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
12414                                     asoc->primary_destination);
12415                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12416                                     asoc->primary_destination);
12417                         }
12418                 } else {
12419                         /*-
12420                          * we still got (or just got) data to send, so set
12421                          * SHUTDOWN_PENDING
12422                          */
12423                         /*-
12424                          * XXX sockets draft says that SCTP_EOF should be
12425                          * sent with no data.  currently, we will allow user
12426                          * data to be sent first and move to
12427                          * SHUTDOWN-PENDING
12428                          */
12429                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12430                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12431                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12432                                 if (hold_tcblock == 0) {
12433                                         SCTP_TCB_LOCK(stcb);
12434                                         hold_tcblock = 1;
12435                                 }
12436                                 if (asoc->locked_on_sending) {
12437                                         /* Locked to send out the data */
12438                                         struct sctp_stream_queue_pending *sp;
12439
12440                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
12441                                         if (sp) {
12442                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
12443                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
12444                                         }
12445                                 }
12446                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
12447                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12448                                     TAILQ_EMPTY(&asoc->sent_queue) &&
12449                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
12450                         abort_anyway:
12451                                         if (free_cnt_applied) {
12452                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
12453                                                 free_cnt_applied = 0;
12454                                         }
12455                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
12456                                             SCTP_RESPONSE_TO_USER_REQ,
12457                                             NULL, SCTP_SO_LOCKED);
12458                                         /*
12459                                          * now relock the stcb so everything
12460                                          * is sane
12461                                          */
12462                                         hold_tcblock = 0;
12463                                         stcb = NULL;
12464                                         goto out;
12465                                 }
12466                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12467                                     asoc->primary_destination);
12468                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
12469                         }
12470                 }
12471         }
12472 skip_out_eof:
12473         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
12474                 some_on_control = 1;
12475         }
12476         if ((net->flight_size > net->cwnd) &&
12477             (sctp_cmt_on_off == 0)) {
12478                 queue_only = 1;
12479         } else if (asoc->ifp_had_enobuf) {
12480                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12481                 if (net->flight_size > (net->mtu * 2)) {
12482                         queue_only = 1;
12483                 } else {
12484                         queue_only = 0;
12485                 }
12486                 asoc->ifp_had_enobuf = 0;
12487                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12488                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12489                     sizeof(struct sctp_data_chunk)));
12490         } else {
12491                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12492                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12493                     sizeof(struct sctp_data_chunk)));
12494                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12495                         queue_only = 1;
12496                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12497                 } else if (net->flight_size > net->cwnd) {
12498                         queue_only = 1;
12499                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12500                 } else {
12501                         queue_only = 0;
12502                 }
12503         }
12504         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12505             (stcb->asoc.total_flight > 0) &&
12506             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12507             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12508             ) {
12509                 /*-
12510                  * Ok, Nagle is set on and we have data outstanding.
12511                  * Don't send anything and let SACKs drive out the
12512                  * data unless wen have a "full" segment to send.
12513                  */
12514                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12515                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12516                 }
12517                 SCTP_STAT_INCR(sctps_naglequeued);
12518                 nagle_applies = 1;
12519         } else {
12520                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12521                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12522                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12523                 }
12524                 SCTP_STAT_INCR(sctps_naglesent);
12525                 nagle_applies = 0;
12526         }
12527         if (queue_only_for_init) {
12528                 if (hold_tcblock == 0) {
12529                         SCTP_TCB_LOCK(stcb);
12530                         hold_tcblock = 1;
12531                 }
12532                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12533                         /* a collision took us forward? */
12534                         queue_only_for_init = 0;
12535                         queue_only = 0;
12536                 } else {
12537                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12538                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
12539                         queue_only_for_init = 0;
12540                         queue_only = 1;
12541                 }
12542         }
12543         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
12544                 /* we can attempt to send too. */
12545                 if (hold_tcblock == 0) {
12546                         /*
12547                          * If there is activity recv'ing sacks no need to
12548                          * send
12549                          */
12550                         if (SCTP_TCB_TRYLOCK(stcb)) {
12551                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12552                                 hold_tcblock = 1;
12553                         }
12554                 } else {
12555                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12556                 }
12557         } else if ((queue_only == 0) &&
12558                     (stcb->asoc.peers_rwnd == 0) &&
12559             (stcb->asoc.total_flight == 0)) {
12560                 /* We get to have a probe outstanding */
12561                 if (hold_tcblock == 0) {
12562                         hold_tcblock = 1;
12563                         SCTP_TCB_LOCK(stcb);
12564                 }
12565                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12566         } else if (some_on_control) {
12567                 int num_out, reason, cwnd_full, frag_point;
12568
12569                 /* Here we do control only */
12570                 if (hold_tcblock == 0) {
12571                         hold_tcblock = 1;
12572                         SCTP_TCB_LOCK(stcb);
12573                 }
12574                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
12575                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
12576                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
12577         }
12578         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d",
12579             queue_only, stcb->asoc.peers_rwnd, un_sent,
12580             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
12581             stcb->asoc.total_output_queue_size, error);
12582
12583 out:
12584 out_unlocked:
12585
12586         if (local_soresv && stcb) {
12587                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
12588                 local_soresv = 0;
12589         }
12590         if (create_lock_applied) {
12591                 SCTP_ASOC_CREATE_UNLOCK(inp);
12592                 create_lock_applied = 0;
12593         }
12594         if ((stcb) && hold_tcblock) {
12595                 SCTP_TCB_UNLOCK(stcb);
12596         }
12597         if (stcb && free_cnt_applied) {
12598                 atomic_add_int(&stcb->asoc.refcnt, -1);
12599         }
12600 #ifdef INVARIANTS
12601         if (stcb) {
12602                 if (mtx_owned(&stcb->tcb_mtx)) {
12603                         panic("Leaving with tcb mtx owned?");
12604                 }
12605                 if (mtx_owned(&stcb->tcb_send_mtx)) {
12606                         panic("Leaving with tcb send mtx owned?");
12607                 }
12608         }
12609 #endif
12610         if (top) {
12611                 sctp_m_freem(top);
12612         }
12613         if (control) {
12614                 sctp_m_freem(control);
12615         }
12616         return (error);
12617 }
12618
12619
12620 /*
12621  * generate an AUTHentication chunk, if required
12622  */
12623 struct mbuf *
12624 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
12625     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
12626     struct sctp_tcb *stcb, uint8_t chunk)
12627 {
12628         struct mbuf *m_auth;
12629         struct sctp_auth_chunk *auth;
12630         int chunk_len;
12631
12632         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
12633             (stcb == NULL))
12634                 return (m);
12635
12636         /* sysctl disabled auth? */
12637         if (sctp_auth_disable)
12638                 return (m);
12639
12640         /* peer doesn't do auth... */
12641         if (!stcb->asoc.peer_supports_auth) {
12642                 return (m);
12643         }
12644         /* does the requested chunk require auth? */
12645         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
12646                 return (m);
12647         }
12648         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
12649         if (m_auth == NULL) {
12650                 /* no mbuf's */
12651                 return (m);
12652         }
12653         /* reserve some space if this will be the first mbuf */
12654         if (m == NULL)
12655                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
12656         /* fill in the AUTH chunk details */
12657         auth = mtod(m_auth, struct sctp_auth_chunk *);
12658         bzero(auth, sizeof(*auth));
12659         auth->ch.chunk_type = SCTP_AUTHENTICATION;
12660         auth->ch.chunk_flags = 0;
12661         chunk_len = sizeof(*auth) +
12662             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
12663         auth->ch.chunk_length = htons(chunk_len);
12664         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
12665         /* key id and hmac digest will be computed and filled in upon send */
12666
12667         /* save the offset where the auth was inserted into the chain */
12668         if (m != NULL) {
12669                 struct mbuf *cn;
12670
12671                 *offset = 0;
12672                 cn = m;
12673                 while (cn) {
12674                         *offset += SCTP_BUF_LEN(cn);
12675                         cn = SCTP_BUF_NEXT(cn);
12676                 }
12677         } else
12678                 *offset = 0;
12679
12680         /* update length and return pointer to the auth chunk */
12681         SCTP_BUF_LEN(m_auth) = chunk_len;
12682         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
12683         if (auth_ret != NULL)
12684                 *auth_ret = auth;
12685
12686         return (m);
12687 }
12688
12689 #ifdef INET6
12690 int
12691 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
12692 {
12693         struct nd_prefix *pfx = NULL;
12694         struct nd_pfxrouter *pfxrtr = NULL;
12695         struct sockaddr_in6 gw6;
12696
12697         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
12698                 return (0);
12699
12700         /* get prefix entry of address */
12701         LIST_FOREACH(pfx, &nd_prefix, ndpr_entry) {
12702                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
12703                         continue;
12704                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
12705                     &src6->sin6_addr, &pfx->ndpr_mask))
12706                         break;
12707         }
12708         /* no prefix entry in the prefix list */
12709         if (pfx == NULL) {
12710                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
12711                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
12712                 return (0);
12713         }
12714         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
12715         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
12716
12717         /* search installed gateway from prefix entry */
12718         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
12719             pfxrtr->pfr_next) {
12720                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
12721                 gw6.sin6_family = AF_INET6;
12722                 gw6.sin6_len = sizeof(struct sockaddr_in6);
12723                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
12724                     sizeof(struct in6_addr));
12725                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
12726                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
12727                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
12728                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
12729                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
12730                     ro->ro_rt->rt_gateway)) {
12731                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
12732                         return (1);
12733                 }
12734         }
12735         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
12736         return (0);
12737 }
12738
12739 #endif
12740
12741 int
12742 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
12743 {
12744         struct sockaddr_in *sin, *mask;
12745         struct ifaddr *ifa;
12746         struct in_addr srcnetaddr, gwnetaddr;
12747
12748         if (ro == NULL || ro->ro_rt == NULL ||
12749             sifa->address.sa.sa_family != AF_INET) {
12750                 return (0);
12751         }
12752         ifa = (struct ifaddr *)sifa->ifa;
12753         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
12754         sin = (struct sockaddr_in *)&sifa->address.sin;
12755         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
12756         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
12757         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
12758         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
12759
12760         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
12761         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
12762         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
12763         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
12764         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
12765         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
12766                 return (1);
12767         }
12768         return (0);
12769 }