sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #if defined(INET) || defined(INET6)
  56 #include <netinet/udp.h>
  57 #endif
  58 #include <netinet/udp_var.h>
  59 #include <machine/in_cksum.h>
  60 #include <netinet/in_kdtrace.h>
  61
  62
  63
  64 #define SCTP_MAX_GAPS_INARRAY 4
  65 struct sack_track {
  66         uint8_t right_edge;     /* mergable on the right edge */
  67         uint8_t left_edge;      /* mergable on the left edge */
  68         uint8_t num_entries;
  69         uint8_t spare;
  70         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  71 };
  72
  73 const struct sack_track sack_array[256] = {
  74         {0, 0, 0, 0,            /* 0x00 */
  75                 {{0, 0},
  76                 {0, 0},
  77                 {0, 0},
  78                 {0, 0}
  79                 }
  80         },
  81         {1, 0, 1, 0,            /* 0x01 */
  82                 {{0, 0},
  83                 {0, 0},
  84                 {0, 0},
  85                 {0, 0}
  86                 }
  87         },
  88         {0, 0, 1, 0,            /* 0x02 */
  89                 {{1, 1},
  90                 {0, 0},
  91                 {0, 0},
  92                 {0, 0}
  93                 }
  94         },
  95         {1, 0, 1, 0,            /* 0x03 */
  96                 {{0, 1},
  97                 {0, 0},
  98                 {0, 0},
  99                 {0, 0}
 100                 }
 101         },
 102         {0, 0, 1, 0,            /* 0x04 */
 103                 {{2, 2},
 104                 {0, 0},
 105                 {0, 0},
 106                 {0, 0}
 107                 }
 108         },
 109         {1, 0, 2, 0,            /* 0x05 */
 110                 {{0, 0},
 111                 {2, 2},
 112                 {0, 0},
 113                 {0, 0}
 114                 }
 115         },
 116         {0, 0, 1, 0,            /* 0x06 */
 117                 {{1, 2},
 118                 {0, 0},
 119                 {0, 0},
 120                 {0, 0}
 121                 }
 122         },
 123         {1, 0, 1, 0,            /* 0x07 */
 124                 {{0, 2},
 125                 {0, 0},
 126                 {0, 0},
 127                 {0, 0}
 128                 }
 129         },
 130         {0, 0, 1, 0,            /* 0x08 */
 131                 {{3, 3},
 132                 {0, 0},
 133                 {0, 0},
 134                 {0, 0}
 135                 }
 136         },
 137         {1, 0, 2, 0,            /* 0x09 */
 138                 {{0, 0},
 139                 {3, 3},
 140                 {0, 0},
 141                 {0, 0}
 142                 }
 143         },
 144         {0, 0, 2, 0,            /* 0x0a */
 145                 {{1, 1},
 146                 {3, 3},
 147                 {0, 0},
 148                 {0, 0}
 149                 }
 150         },
 151         {1, 0, 2, 0,            /* 0x0b */
 152                 {{0, 1},
 153                 {3, 3},
 154                 {0, 0},
 155                 {0, 0}
 156                 }
 157         },
 158         {0, 0, 1, 0,            /* 0x0c */
 159                 {{2, 3},
 160                 {0, 0},
 161                 {0, 0},
 162                 {0, 0}
 163                 }
 164         },
 165         {1, 0, 2, 0,            /* 0x0d */
 166                 {{0, 0},
 167                 {2, 3},
 168                 {0, 0},
 169                 {0, 0}
 170                 }
 171         },
 172         {0, 0, 1, 0,            /* 0x0e */
 173                 {{1, 3},
 174                 {0, 0},
 175                 {0, 0},
 176                 {0, 0}
 177                 }
 178         },
 179         {1, 0, 1, 0,            /* 0x0f */
 180                 {{0, 3},
 181                 {0, 0},
 182                 {0, 0},
 183                 {0, 0}
 184                 }
 185         },
 186         {0, 0, 1, 0,            /* 0x10 */
 187                 {{4, 4},
 188                 {0, 0},
 189                 {0, 0},
 190                 {0, 0}
 191                 }
 192         },
 193         {1, 0, 2, 0,            /* 0x11 */
 194                 {{0, 0},
 195                 {4, 4},
 196                 {0, 0},
 197                 {0, 0}
 198                 }
 199         },
 200         {0, 0, 2, 0,            /* 0x12 */
 201                 {{1, 1},
 202                 {4, 4},
 203                 {0, 0},
 204                 {0, 0}
 205                 }
 206         },
 207         {1, 0, 2, 0,            /* 0x13 */
 208                 {{0, 1},
 209                 {4, 4},
 210                 {0, 0},
 211                 {0, 0}
 212                 }
 213         },
 214         {0, 0, 2, 0,            /* 0x14 */
 215                 {{2, 2},
 216                 {4, 4},
 217                 {0, 0},
 218                 {0, 0}
 219                 }
 220         },
 221         {1, 0, 3, 0,            /* 0x15 */
 222                 {{0, 0},
 223                 {2, 2},
 224                 {4, 4},
 225                 {0, 0}
 226                 }
 227         },
 228         {0, 0, 2, 0,            /* 0x16 */
 229                 {{1, 2},
 230                 {4, 4},
 231                 {0, 0},
 232                 {0, 0}
 233                 }
 234         },
 235         {1, 0, 2, 0,            /* 0x17 */
 236                 {{0, 2},
 237                 {4, 4},
 238                 {0, 0},
 239                 {0, 0}
 240                 }
 241         },
 242         {0, 0, 1, 0,            /* 0x18 */
 243                 {{3, 4},
 244                 {0, 0},
 245                 {0, 0},
 246                 {0, 0}
 247                 }
 248         },
 249         {1, 0, 2, 0,            /* 0x19 */
 250                 {{0, 0},
 251                 {3, 4},
 252                 {0, 0},
 253                 {0, 0}
 254                 }
 255         },
 256         {0, 0, 2, 0,            /* 0x1a */
 257                 {{1, 1},
 258                 {3, 4},
 259                 {0, 0},
 260                 {0, 0}
 261                 }
 262         },
 263         {1, 0, 2, 0,            /* 0x1b */
 264                 {{0, 1},
 265                 {3, 4},
 266                 {0, 0},
 267                 {0, 0}
 268                 }
 269         },
 270         {0, 0, 1, 0,            /* 0x1c */
 271                 {{2, 4},
 272                 {0, 0},
 273                 {0, 0},
 274                 {0, 0}
 275                 }
 276         },
 277         {1, 0, 2, 0,            /* 0x1d */
 278                 {{0, 0},
 279                 {2, 4},
 280                 {0, 0},
 281                 {0, 0}
 282                 }
 283         },
 284         {0, 0, 1, 0,            /* 0x1e */
 285                 {{1, 4},
 286                 {0, 0},
 287                 {0, 0},
 288                 {0, 0}
 289                 }
 290         },
 291         {1, 0, 1, 0,            /* 0x1f */
 292                 {{0, 4},
 293                 {0, 0},
 294                 {0, 0},
 295                 {0, 0}
 296                 }
 297         },
 298         {0, 0, 1, 0,            /* 0x20 */
 299                 {{5, 5},
 300                 {0, 0},
 301                 {0, 0},
 302                 {0, 0}
 303                 }
 304         },
 305         {1, 0, 2, 0,            /* 0x21 */
 306                 {{0, 0},
 307                 {5, 5},
 308                 {0, 0},
 309                 {0, 0}
 310                 }
 311         },
 312         {0, 0, 2, 0,            /* 0x22 */
 313                 {{1, 1},
 314                 {5, 5},
 315                 {0, 0},
 316                 {0, 0}
 317                 }
 318         },
 319         {1, 0, 2, 0,            /* 0x23 */
 320                 {{0, 1},
 321                 {5, 5},
 322                 {0, 0},
 323                 {0, 0}
 324                 }
 325         },
 326         {0, 0, 2, 0,            /* 0x24 */
 327                 {{2, 2},
 328                 {5, 5},
 329                 {0, 0},
 330                 {0, 0}
 331                 }
 332         },
 333         {1, 0, 3, 0,            /* 0x25 */
 334                 {{0, 0},
 335                 {2, 2},
 336                 {5, 5},
 337                 {0, 0}
 338                 }
 339         },
 340         {0, 0, 2, 0,            /* 0x26 */
 341                 {{1, 2},
 342                 {5, 5},
 343                 {0, 0},
 344                 {0, 0}
 345                 }
 346         },
 347         {1, 0, 2, 0,            /* 0x27 */
 348                 {{0, 2},
 349                 {5, 5},
 350                 {0, 0},
 351                 {0, 0}
 352                 }
 353         },
 354         {0, 0, 2, 0,            /* 0x28 */
 355                 {{3, 3},
 356                 {5, 5},
 357                 {0, 0},
 358                 {0, 0}
 359                 }
 360         },
 361         {1, 0, 3, 0,            /* 0x29 */
 362                 {{0, 0},
 363                 {3, 3},
 364                 {5, 5},
 365                 {0, 0}
 366                 }
 367         },
 368         {0, 0, 3, 0,            /* 0x2a */
 369                 {{1, 1},
 370                 {3, 3},
 371                 {5, 5},
 372                 {0, 0}
 373                 }
 374         },
 375         {1, 0, 3, 0,            /* 0x2b */
 376                 {{0, 1},
 377                 {3, 3},
 378                 {5, 5},
 379                 {0, 0}
 380                 }
 381         },
 382         {0, 0, 2, 0,            /* 0x2c */
 383                 {{2, 3},
 384                 {5, 5},
 385                 {0, 0},
 386                 {0, 0}
 387                 }
 388         },
 389         {1, 0, 3, 0,            /* 0x2d */
 390                 {{0, 0},
 391                 {2, 3},
 392                 {5, 5},
 393                 {0, 0}
 394                 }
 395         },
 396         {0, 0, 2, 0,            /* 0x2e */
 397                 {{1, 3},
 398                 {5, 5},
 399                 {0, 0},
 400                 {0, 0}
 401                 }
 402         },
 403         {1, 0, 2, 0,            /* 0x2f */
 404                 {{0, 3},
 405                 {5, 5},
 406                 {0, 0},
 407                 {0, 0}
 408                 }
 409         },
 410         {0, 0, 1, 0,            /* 0x30 */
 411                 {{4, 5},
 412                 {0, 0},
 413                 {0, 0},
 414                 {0, 0}
 415                 }
 416         },
 417         {1, 0, 2, 0,            /* 0x31 */
 418                 {{0, 0},
 419                 {4, 5},
 420                 {0, 0},
 421                 {0, 0}
 422                 }
 423         },
 424         {0, 0, 2, 0,            /* 0x32 */
 425                 {{1, 1},
 426                 {4, 5},
 427                 {0, 0},
 428                 {0, 0}
 429                 }
 430         },
 431         {1, 0, 2, 0,            /* 0x33 */
 432                 {{0, 1},
 433                 {4, 5},
 434                 {0, 0},
 435                 {0, 0}
 436                 }
 437         },
 438         {0, 0, 2, 0,            /* 0x34 */
 439                 {{2, 2},
 440                 {4, 5},
 441                 {0, 0},
 442                 {0, 0}
 443                 }
 444         },
 445         {1, 0, 3, 0,            /* 0x35 */
 446                 {{0, 0},
 447                 {2, 2},
 448                 {4, 5},
 449                 {0, 0}
 450                 }
 451         },
 452         {0, 0, 2, 0,            /* 0x36 */
 453                 {{1, 2},
 454                 {4, 5},
 455                 {0, 0},
 456                 {0, 0}
 457                 }
 458         },
 459         {1, 0, 2, 0,            /* 0x37 */
 460                 {{0, 2},
 461                 {4, 5},
 462                 {0, 0},
 463                 {0, 0}
 464                 }
 465         },
 466         {0, 0, 1, 0,            /* 0x38 */
 467                 {{3, 5},
 468                 {0, 0},
 469                 {0, 0},
 470                 {0, 0}
 471                 }
 472         },
 473         {1, 0, 2, 0,            /* 0x39 */
 474                 {{0, 0},
 475                 {3, 5},
 476                 {0, 0},
 477                 {0, 0}
 478                 }
 479         },
 480         {0, 0, 2, 0,            /* 0x3a */
 481                 {{1, 1},
 482                 {3, 5},
 483                 {0, 0},
 484                 {0, 0}
 485                 }
 486         },
 487         {1, 0, 2, 0,            /* 0x3b */
 488                 {{0, 1},
 489                 {3, 5},
 490                 {0, 0},
 491                 {0, 0}
 492                 }
 493         },
 494         {0, 0, 1, 0,            /* 0x3c */
 495                 {{2, 5},
 496                 {0, 0},
 497                 {0, 0},
 498                 {0, 0}
 499                 }
 500         },
 501         {1, 0, 2, 0,            /* 0x3d */
 502                 {{0, 0},
 503                 {2, 5},
 504                 {0, 0},
 505                 {0, 0}
 506                 }
 507         },
 508         {0, 0, 1, 0,            /* 0x3e */
 509                 {{1, 5},
 510                 {0, 0},
 511                 {0, 0},
 512                 {0, 0}
 513                 }
 514         },
 515         {1, 0, 1, 0,            /* 0x3f */
 516                 {{0, 5},
 517                 {0, 0},
 518                 {0, 0},
 519                 {0, 0}
 520                 }
 521         },
 522         {0, 0, 1, 0,            /* 0x40 */
 523                 {{6, 6},
 524                 {0, 0},
 525                 {0, 0},
 526                 {0, 0}
 527                 }
 528         },
 529         {1, 0, 2, 0,            /* 0x41 */
 530                 {{0, 0},
 531                 {6, 6},
 532                 {0, 0},
 533                 {0, 0}
 534                 }
 535         },
 536         {0, 0, 2, 0,            /* 0x42 */
 537                 {{1, 1},
 538                 {6, 6},
 539                 {0, 0},
 540                 {0, 0}
 541                 }
 542         },
 543         {1, 0, 2, 0,            /* 0x43 */
 544                 {{0, 1},
 545                 {6, 6},
 546                 {0, 0},
 547                 {0, 0}
 548                 }
 549         },
 550         {0, 0, 2, 0,            /* 0x44 */
 551                 {{2, 2},
 552                 {6, 6},
 553                 {0, 0},
 554                 {0, 0}
 555                 }
 556         },
 557         {1, 0, 3, 0,            /* 0x45 */
 558                 {{0, 0},
 559                 {2, 2},
 560                 {6, 6},
 561                 {0, 0}
 562                 }
 563         },
 564         {0, 0, 2, 0,            /* 0x46 */
 565                 {{1, 2},
 566                 {6, 6},
 567                 {0, 0},
 568                 {0, 0}
 569                 }
 570         },
 571         {1, 0, 2, 0,            /* 0x47 */
 572                 {{0, 2},
 573                 {6, 6},
 574                 {0, 0},
 575                 {0, 0}
 576                 }
 577         },
 578         {0, 0, 2, 0,            /* 0x48 */
 579                 {{3, 3},
 580                 {6, 6},
 581                 {0, 0},
 582                 {0, 0}
 583                 }
 584         },
 585         {1, 0, 3, 0,            /* 0x49 */
 586                 {{0, 0},
 587                 {3, 3},
 588                 {6, 6},
 589                 {0, 0}
 590                 }
 591         },
 592         {0, 0, 3, 0,            /* 0x4a */
 593                 {{1, 1},
 594                 {3, 3},
 595                 {6, 6},
 596                 {0, 0}
 597                 }
 598         },
 599         {1, 0, 3, 0,            /* 0x4b */
 600                 {{0, 1},
 601                 {3, 3},
 602                 {6, 6},
 603                 {0, 0}
 604                 }
 605         },
 606         {0, 0, 2, 0,            /* 0x4c */
 607                 {{2, 3},
 608                 {6, 6},
 609                 {0, 0},
 610                 {0, 0}
 611                 }
 612         },
 613         {1, 0, 3, 0,            /* 0x4d */
 614                 {{0, 0},
 615                 {2, 3},
 616                 {6, 6},
 617                 {0, 0}
 618                 }
 619         },
 620         {0, 0, 2, 0,            /* 0x4e */
 621                 {{1, 3},
 622                 {6, 6},
 623                 {0, 0},
 624                 {0, 0}
 625                 }
 626         },
 627         {1, 0, 2, 0,            /* 0x4f */
 628                 {{0, 3},
 629                 {6, 6},
 630                 {0, 0},
 631                 {0, 0}
 632                 }
 633         },
 634         {0, 0, 2, 0,            /* 0x50 */
 635                 {{4, 4},
 636                 {6, 6},
 637                 {0, 0},
 638                 {0, 0}
 639                 }
 640         },
 641         {1, 0, 3, 0,            /* 0x51 */
 642                 {{0, 0},
 643                 {4, 4},
 644                 {6, 6},
 645                 {0, 0}
 646                 }
 647         },
 648         {0, 0, 3, 0,            /* 0x52 */
 649                 {{1, 1},
 650                 {4, 4},
 651                 {6, 6},
 652                 {0, 0}
 653                 }
 654         },
 655         {1, 0, 3, 0,            /* 0x53 */
 656                 {{0, 1},
 657                 {4, 4},
 658                 {6, 6},
 659                 {0, 0}
 660                 }
 661         },
 662         {0, 0, 3, 0,            /* 0x54 */
 663                 {{2, 2},
 664                 {4, 4},
 665                 {6, 6},
 666                 {0, 0}
 667                 }
 668         },
 669         {1, 0, 4, 0,            /* 0x55 */
 670                 {{0, 0},
 671                 {2, 2},
 672                 {4, 4},
 673                 {6, 6}
 674                 }
 675         },
 676         {0, 0, 3, 0,            /* 0x56 */
 677                 {{1, 2},
 678                 {4, 4},
 679                 {6, 6},
 680                 {0, 0}
 681                 }
 682         },
 683         {1, 0, 3, 0,            /* 0x57 */
 684                 {{0, 2},
 685                 {4, 4},
 686                 {6, 6},
 687                 {0, 0}
 688                 }
 689         },
 690         {0, 0, 2, 0,            /* 0x58 */
 691                 {{3, 4},
 692                 {6, 6},
 693                 {0, 0},
 694                 {0, 0}
 695                 }
 696         },
 697         {1, 0, 3, 0,            /* 0x59 */
 698                 {{0, 0},
 699                 {3, 4},
 700                 {6, 6},
 701                 {0, 0}
 702                 }
 703         },
 704         {0, 0, 3, 0,            /* 0x5a */
 705                 {{1, 1},
 706                 {3, 4},
 707                 {6, 6},
 708                 {0, 0}
 709                 }
 710         },
 711         {1, 0, 3, 0,            /* 0x5b */
 712                 {{0, 1},
 713                 {3, 4},
 714                 {6, 6},
 715                 {0, 0}
 716                 }
 717         },
 718         {0, 0, 2, 0,            /* 0x5c */
 719                 {{2, 4},
 720                 {6, 6},
 721                 {0, 0},
 722                 {0, 0}
 723                 }
 724         },
 725         {1, 0, 3, 0,            /* 0x5d */
 726                 {{0, 0},
 727                 {2, 4},
 728                 {6, 6},
 729                 {0, 0}
 730                 }
 731         },
 732         {0, 0, 2, 0,            /* 0x5e */
 733                 {{1, 4},
 734                 {6, 6},
 735                 {0, 0},
 736                 {0, 0}
 737                 }
 738         },
 739         {1, 0, 2, 0,            /* 0x5f */
 740                 {{0, 4},
 741                 {6, 6},
 742                 {0, 0},
 743                 {0, 0}
 744                 }
 745         },
 746         {0, 0, 1, 0,            /* 0x60 */
 747                 {{5, 6},
 748                 {0, 0},
 749                 {0, 0},
 750                 {0, 0}
 751                 }
 752         },
 753         {1, 0, 2, 0,            /* 0x61 */
 754                 {{0, 0},
 755                 {5, 6},
 756                 {0, 0},
 757                 {0, 0}
 758                 }
 759         },
 760         {0, 0, 2, 0,            /* 0x62 */
 761                 {{1, 1},
 762                 {5, 6},
 763                 {0, 0},
 764                 {0, 0}
 765                 }
 766         },
 767         {1, 0, 2, 0,            /* 0x63 */
 768                 {{0, 1},
 769                 {5, 6},
 770                 {0, 0},
 771                 {0, 0}
 772                 }
 773         },
 774         {0, 0, 2, 0,            /* 0x64 */
 775                 {{2, 2},
 776                 {5, 6},
 777                 {0, 0},
 778                 {0, 0}
 779                 }
 780         },
 781         {1, 0, 3, 0,            /* 0x65 */
 782                 {{0, 0},
 783                 {2, 2},
 784                 {5, 6},
 785                 {0, 0}
 786                 }
 787         },
 788         {0, 0, 2, 0,            /* 0x66 */
 789                 {{1, 2},
 790                 {5, 6},
 791                 {0, 0},
 792                 {0, 0}
 793                 }
 794         },
 795         {1, 0, 2, 0,            /* 0x67 */
 796                 {{0, 2},
 797                 {5, 6},
 798                 {0, 0},
 799                 {0, 0}
 800                 }
 801         },
 802         {0, 0, 2, 0,            /* 0x68 */
 803                 {{3, 3},
 804                 {5, 6},
 805                 {0, 0},
 806                 {0, 0}
 807                 }
 808         },
 809         {1, 0, 3, 0,            /* 0x69 */
 810                 {{0, 0},
 811                 {3, 3},
 812                 {5, 6},
 813                 {0, 0}
 814                 }
 815         },
 816         {0, 0, 3, 0,            /* 0x6a */
 817                 {{1, 1},
 818                 {3, 3},
 819                 {5, 6},
 820                 {0, 0}
 821                 }
 822         },
 823         {1, 0, 3, 0,            /* 0x6b */
 824                 {{0, 1},
 825                 {3, 3},
 826                 {5, 6},
 827                 {0, 0}
 828                 }
 829         },
 830         {0, 0, 2, 0,            /* 0x6c */
 831                 {{2, 3},
 832                 {5, 6},
 833                 {0, 0},
 834                 {0, 0}
 835                 }
 836         },
 837         {1, 0, 3, 0,            /* 0x6d */
 838                 {{0, 0},
 839                 {2, 3},
 840                 {5, 6},
 841                 {0, 0}
 842                 }
 843         },
 844         {0, 0, 2, 0,            /* 0x6e */
 845                 {{1, 3},
 846                 {5, 6},
 847                 {0, 0},
 848                 {0, 0}
 849                 }
 850         },
 851         {1, 0, 2, 0,            /* 0x6f */
 852                 {{0, 3},
 853                 {5, 6},
 854                 {0, 0},
 855                 {0, 0}
 856                 }
 857         },
 858         {0, 0, 1, 0,            /* 0x70 */
 859                 {{4, 6},
 860                 {0, 0},
 861                 {0, 0},
 862                 {0, 0}
 863                 }
 864         },
 865         {1, 0, 2, 0,            /* 0x71 */
 866                 {{0, 0},
 867                 {4, 6},
 868                 {0, 0},
 869                 {0, 0}
 870                 }
 871         },
 872         {0, 0, 2, 0,            /* 0x72 */
 873                 {{1, 1},
 874                 {4, 6},
 875                 {0, 0},
 876                 {0, 0}
 877                 }
 878         },
 879         {1, 0, 2, 0,            /* 0x73 */
 880                 {{0, 1},
 881                 {4, 6},
 882                 {0, 0},
 883                 {0, 0}
 884                 }
 885         },
 886         {0, 0, 2, 0,            /* 0x74 */
 887                 {{2, 2},
 888                 {4, 6},
 889                 {0, 0},
 890                 {0, 0}
 891                 }
 892         },
 893         {1, 0, 3, 0,            /* 0x75 */
 894                 {{0, 0},
 895                 {2, 2},
 896                 {4, 6},
 897                 {0, 0}
 898                 }
 899         },
 900         {0, 0, 2, 0,            /* 0x76 */
 901                 {{1, 2},
 902                 {4, 6},
 903                 {0, 0},
 904                 {0, 0}
 905                 }
 906         },
 907         {1, 0, 2, 0,            /* 0x77 */
 908                 {{0, 2},
 909                 {4, 6},
 910                 {0, 0},
 911                 {0, 0}
 912                 }
 913         },
 914         {0, 0, 1, 0,            /* 0x78 */
 915                 {{3, 6},
 916                 {0, 0},
 917                 {0, 0},
 918                 {0, 0}
 919                 }
 920         },
 921         {1, 0, 2, 0,            /* 0x79 */
 922                 {{0, 0},
 923                 {3, 6},
 924                 {0, 0},
 925                 {0, 0}
 926                 }
 927         },
 928         {0, 0, 2, 0,            /* 0x7a */
 929                 {{1, 1},
 930                 {3, 6},
 931                 {0, 0},
 932                 {0, 0}
 933                 }
 934         },
 935         {1, 0, 2, 0,            /* 0x7b */
 936                 {{0, 1},
 937                 {3, 6},
 938                 {0, 0},
 939                 {0, 0}
 940                 }
 941         },
 942         {0, 0, 1, 0,            /* 0x7c */
 943                 {{2, 6},
 944                 {0, 0},
 945                 {0, 0},
 946                 {0, 0}
 947                 }
 948         },
 949         {1, 0, 2, 0,            /* 0x7d */
 950                 {{0, 0},
 951                 {2, 6},
 952                 {0, 0},
 953                 {0, 0}
 954                 }
 955         },
 956         {0, 0, 1, 0,            /* 0x7e */
 957                 {{1, 6},
 958                 {0, 0},
 959                 {0, 0},
 960                 {0, 0}
 961                 }
 962         },
 963         {1, 0, 1, 0,            /* 0x7f */
 964                 {{0, 6},
 965                 {0, 0},
 966                 {0, 0},
 967                 {0, 0}
 968                 }
 969         },
 970         {0, 1, 1, 0,            /* 0x80 */
 971                 {{7, 7},
 972                 {0, 0},
 973                 {0, 0},
 974                 {0, 0}
 975                 }
 976         },
 977         {1, 1, 2, 0,            /* 0x81 */
 978                 {{0, 0},
 979                 {7, 7},
 980                 {0, 0},
 981                 {0, 0}
 982                 }
 983         },
 984         {0, 1, 2, 0,            /* 0x82 */
 985                 {{1, 1},
 986                 {7, 7},
 987                 {0, 0},
 988                 {0, 0}
 989                 }
 990         },
 991         {1, 1, 2, 0,            /* 0x83 */
 992                 {{0, 1},
 993                 {7, 7},
 994                 {0, 0},
 995                 {0, 0}
 996                 }
 997         },
 998         {0, 1, 2, 0,            /* 0x84 */
 999                 {{2, 2},
1000                 {7, 7},
1001                 {0, 0},
1002                 {0, 0}
1003                 }
1004         },
1005         {1, 1, 3, 0,            /* 0x85 */
1006                 {{0, 0},
1007                 {2, 2},
1008                 {7, 7},
1009                 {0, 0}
1010                 }
1011         },
1012         {0, 1, 2, 0,            /* 0x86 */
1013                 {{1, 2},
1014                 {7, 7},
1015                 {0, 0},
1016                 {0, 0}
1017                 }
1018         },
1019         {1, 1, 2, 0,            /* 0x87 */
1020                 {{0, 2},
1021                 {7, 7},
1022                 {0, 0},
1023                 {0, 0}
1024                 }
1025         },
1026         {0, 1, 2, 0,            /* 0x88 */
1027                 {{3, 3},
1028                 {7, 7},
1029                 {0, 0},
1030                 {0, 0}
1031                 }
1032         },
1033         {1, 1, 3, 0,            /* 0x89 */
1034                 {{0, 0},
1035                 {3, 3},
1036                 {7, 7},
1037                 {0, 0}
1038                 }
1039         },
1040         {0, 1, 3, 0,            /* 0x8a */
1041                 {{1, 1},
1042                 {3, 3},
1043                 {7, 7},
1044                 {0, 0}
1045                 }
1046         },
1047         {1, 1, 3, 0,            /* 0x8b */
1048                 {{0, 1},
1049                 {3, 3},
1050                 {7, 7},
1051                 {0, 0}
1052                 }
1053         },
1054         {0, 1, 2, 0,            /* 0x8c */
1055                 {{2, 3},
1056                 {7, 7},
1057                 {0, 0},
1058                 {0, 0}
1059                 }
1060         },
1061         {1, 1, 3, 0,            /* 0x8d */
1062                 {{0, 0},
1063                 {2, 3},
1064                 {7, 7},
1065                 {0, 0}
1066                 }
1067         },
1068         {0, 1, 2, 0,            /* 0x8e */
1069                 {{1, 3},
1070                 {7, 7},
1071                 {0, 0},
1072                 {0, 0}
1073                 }
1074         },
1075         {1, 1, 2, 0,            /* 0x8f */
1076                 {{0, 3},
1077                 {7, 7},
1078                 {0, 0},
1079                 {0, 0}
1080                 }
1081         },
1082         {0, 1, 2, 0,            /* 0x90 */
1083                 {{4, 4},
1084                 {7, 7},
1085                 {0, 0},
1086                 {0, 0}
1087                 }
1088         },
1089         {1, 1, 3, 0,            /* 0x91 */
1090                 {{0, 0},
1091                 {4, 4},
1092                 {7, 7},
1093                 {0, 0}
1094                 }
1095         },
1096         {0, 1, 3, 0,            /* 0x92 */
1097                 {{1, 1},
1098                 {4, 4},
1099                 {7, 7},
1100                 {0, 0}
1101                 }
1102         },
1103         {1, 1, 3, 0,            /* 0x93 */
1104                 {{0, 1},
1105                 {4, 4},
1106                 {7, 7},
1107                 {0, 0}
1108                 }
1109         },
1110         {0, 1, 3, 0,            /* 0x94 */
1111                 {{2, 2},
1112                 {4, 4},
1113                 {7, 7},
1114                 {0, 0}
1115                 }
1116         },
1117         {1, 1, 4, 0,            /* 0x95 */
1118                 {{0, 0},
1119                 {2, 2},
1120                 {4, 4},
1121                 {7, 7}
1122                 }
1123         },
1124         {0, 1, 3, 0,            /* 0x96 */
1125                 {{1, 2},
1126                 {4, 4},
1127                 {7, 7},
1128                 {0, 0}
1129                 }
1130         },
1131         {1, 1, 3, 0,            /* 0x97 */
1132                 {{0, 2},
1133                 {4, 4},
1134                 {7, 7},
1135                 {0, 0}
1136                 }
1137         },
1138         {0, 1, 2, 0,            /* 0x98 */
1139                 {{3, 4},
1140                 {7, 7},
1141                 {0, 0},
1142                 {0, 0}
1143                 }
1144         },
1145         {1, 1, 3, 0,            /* 0x99 */
1146                 {{0, 0},
1147                 {3, 4},
1148                 {7, 7},
1149                 {0, 0}
1150                 }
1151         },
1152         {0, 1, 3, 0,            /* 0x9a */
1153                 {{1, 1},
1154                 {3, 4},
1155                 {7, 7},
1156                 {0, 0}
1157                 }
1158         },
1159         {1, 1, 3, 0,            /* 0x9b */
1160                 {{0, 1},
1161                 {3, 4},
1162                 {7, 7},
1163                 {0, 0}
1164                 }
1165         },
1166         {0, 1, 2, 0,            /* 0x9c */
1167                 {{2, 4},
1168                 {7, 7},
1169                 {0, 0},
1170                 {0, 0}
1171                 }
1172         },
1173         {1, 1, 3, 0,            /* 0x9d */
1174                 {{0, 0},
1175                 {2, 4},
1176                 {7, 7},
1177                 {0, 0}
1178                 }
1179         },
1180         {0, 1, 2, 0,            /* 0x9e */
1181                 {{1, 4},
1182                 {7, 7},
1183                 {0, 0},
1184                 {0, 0}
1185                 }
1186         },
1187         {1, 1, 2, 0,            /* 0x9f */
1188                 {{0, 4},
1189                 {7, 7},
1190                 {0, 0},
1191                 {0, 0}
1192                 }
1193         },
1194         {0, 1, 2, 0,            /* 0xa0 */
1195                 {{5, 5},
1196                 {7, 7},
1197                 {0, 0},
1198                 {0, 0}
1199                 }
1200         },
1201         {1, 1, 3, 0,            /* 0xa1 */
1202                 {{0, 0},
1203                 {5, 5},
1204                 {7, 7},
1205                 {0, 0}
1206                 }
1207         },
1208         {0, 1, 3, 0,            /* 0xa2 */
1209                 {{1, 1},
1210                 {5, 5},
1211                 {7, 7},
1212                 {0, 0}
1213                 }
1214         },
1215         {1, 1, 3, 0,            /* 0xa3 */
1216                 {{0, 1},
1217                 {5, 5},
1218                 {7, 7},
1219                 {0, 0}
1220                 }
1221         },
1222         {0, 1, 3, 0,            /* 0xa4 */
1223                 {{2, 2},
1224                 {5, 5},
1225                 {7, 7},
1226                 {0, 0}
1227                 }
1228         },
1229         {1, 1, 4, 0,            /* 0xa5 */
1230                 {{0, 0},
1231                 {2, 2},
1232                 {5, 5},
1233                 {7, 7}
1234                 }
1235         },
1236         {0, 1, 3, 0,            /* 0xa6 */
1237                 {{1, 2},
1238                 {5, 5},
1239                 {7, 7},
1240                 {0, 0}
1241                 }
1242         },
1243         {1, 1, 3, 0,            /* 0xa7 */
1244                 {{0, 2},
1245                 {5, 5},
1246                 {7, 7},
1247                 {0, 0}
1248                 }
1249         },
1250         {0, 1, 3, 0,            /* 0xa8 */
1251                 {{3, 3},
1252                 {5, 5},
1253                 {7, 7},
1254                 {0, 0}
1255                 }
1256         },
1257         {1, 1, 4, 0,            /* 0xa9 */
1258                 {{0, 0},
1259                 {3, 3},
1260                 {5, 5},
1261                 {7, 7}
1262                 }
1263         },
1264         {0, 1, 4, 0,            /* 0xaa */
1265                 {{1, 1},
1266                 {3, 3},
1267                 {5, 5},
1268                 {7, 7}
1269                 }
1270         },
1271         {1, 1, 4, 0,            /* 0xab */
1272                 {{0, 1},
1273                 {3, 3},
1274                 {5, 5},
1275                 {7, 7}
1276                 }
1277         },
1278         {0, 1, 3, 0,            /* 0xac */
1279                 {{2, 3},
1280                 {5, 5},
1281                 {7, 7},
1282                 {0, 0}
1283                 }
1284         },
1285         {1, 1, 4, 0,            /* 0xad */
1286                 {{0, 0},
1287                 {2, 3},
1288                 {5, 5},
1289                 {7, 7}
1290                 }
1291         },
1292         {0, 1, 3, 0,            /* 0xae */
1293                 {{1, 3},
1294                 {5, 5},
1295                 {7, 7},
1296                 {0, 0}
1297                 }
1298         },
1299         {1, 1, 3, 0,            /* 0xaf */
1300                 {{0, 3},
1301                 {5, 5},
1302                 {7, 7},
1303                 {0, 0}
1304                 }
1305         },
1306         {0, 1, 2, 0,            /* 0xb0 */
1307                 {{4, 5},
1308                 {7, 7},
1309                 {0, 0},
1310                 {0, 0}
1311                 }
1312         },
1313         {1, 1, 3, 0,            /* 0xb1 */
1314                 {{0, 0},
1315                 {4, 5},
1316                 {7, 7},
1317                 {0, 0}
1318                 }
1319         },
1320         {0, 1, 3, 0,            /* 0xb2 */
1321                 {{1, 1},
1322                 {4, 5},
1323                 {7, 7},
1324                 {0, 0}
1325                 }
1326         },
1327         {1, 1, 3, 0,            /* 0xb3 */
1328                 {{0, 1},
1329                 {4, 5},
1330                 {7, 7},
1331                 {0, 0}
1332                 }
1333         },
1334         {0, 1, 3, 0,            /* 0xb4 */
1335                 {{2, 2},
1336                 {4, 5},
1337                 {7, 7},
1338                 {0, 0}
1339                 }
1340         },
1341         {1, 1, 4, 0,            /* 0xb5 */
1342                 {{0, 0},
1343                 {2, 2},
1344                 {4, 5},
1345                 {7, 7}
1346                 }
1347         },
1348         {0, 1, 3, 0,            /* 0xb6 */
1349                 {{1, 2},
1350                 {4, 5},
1351                 {7, 7},
1352                 {0, 0}
1353                 }
1354         },
1355         {1, 1, 3, 0,            /* 0xb7 */
1356                 {{0, 2},
1357                 {4, 5},
1358                 {7, 7},
1359                 {0, 0}
1360                 }
1361         },
1362         {0, 1, 2, 0,            /* 0xb8 */
1363                 {{3, 5},
1364                 {7, 7},
1365                 {0, 0},
1366                 {0, 0}
1367                 }
1368         },
1369         {1, 1, 3, 0,            /* 0xb9 */
1370                 {{0, 0},
1371                 {3, 5},
1372                 {7, 7},
1373                 {0, 0}
1374                 }
1375         },
1376         {0, 1, 3, 0,            /* 0xba */
1377                 {{1, 1},
1378                 {3, 5},
1379                 {7, 7},
1380                 {0, 0}
1381                 }
1382         },
1383         {1, 1, 3, 0,            /* 0xbb */
1384                 {{0, 1},
1385                 {3, 5},
1386                 {7, 7},
1387                 {0, 0}
1388                 }
1389         },
1390         {0, 1, 2, 0,            /* 0xbc */
1391                 {{2, 5},
1392                 {7, 7},
1393                 {0, 0},
1394                 {0, 0}
1395                 }
1396         },
1397         {1, 1, 3, 0,            /* 0xbd */
1398                 {{0, 0},
1399                 {2, 5},
1400                 {7, 7},
1401                 {0, 0}
1402                 }
1403         },
1404         {0, 1, 2, 0,            /* 0xbe */
1405                 {{1, 5},
1406                 {7, 7},
1407                 {0, 0},
1408                 {0, 0}
1409                 }
1410         },
1411         {1, 1, 2, 0,            /* 0xbf */
1412                 {{0, 5},
1413                 {7, 7},
1414                 {0, 0},
1415                 {0, 0}
1416                 }
1417         },
1418         {0, 1, 1, 0,            /* 0xc0 */
1419                 {{6, 7},
1420                 {0, 0},
1421                 {0, 0},
1422                 {0, 0}
1423                 }
1424         },
1425         {1, 1, 2, 0,            /* 0xc1 */
1426                 {{0, 0},
1427                 {6, 7},
1428                 {0, 0},
1429                 {0, 0}
1430                 }
1431         },
1432         {0, 1, 2, 0,            /* 0xc2 */
1433                 {{1, 1},
1434                 {6, 7},
1435                 {0, 0},
1436                 {0, 0}
1437                 }
1438         },
1439         {1, 1, 2, 0,            /* 0xc3 */
1440                 {{0, 1},
1441                 {6, 7},
1442                 {0, 0},
1443                 {0, 0}
1444                 }
1445         },
1446         {0, 1, 2, 0,            /* 0xc4 */
1447                 {{2, 2},
1448                 {6, 7},
1449                 {0, 0},
1450                 {0, 0}
1451                 }
1452         },
1453         {1, 1, 3, 0,            /* 0xc5 */
1454                 {{0, 0},
1455                 {2, 2},
1456                 {6, 7},
1457                 {0, 0}
1458                 }
1459         },
1460         {0, 1, 2, 0,            /* 0xc6 */
1461                 {{1, 2},
1462                 {6, 7},
1463                 {0, 0},
1464                 {0, 0}
1465                 }
1466         },
1467         {1, 1, 2, 0,            /* 0xc7 */
1468                 {{0, 2},
1469                 {6, 7},
1470                 {0, 0},
1471                 {0, 0}
1472                 }
1473         },
1474         {0, 1, 2, 0,            /* 0xc8 */
1475                 {{3, 3},
1476                 {6, 7},
1477                 {0, 0},
1478                 {0, 0}
1479                 }
1480         },
1481         {1, 1, 3, 0,            /* 0xc9 */
1482                 {{0, 0},
1483                 {3, 3},
1484                 {6, 7},
1485                 {0, 0}
1486                 }
1487         },
1488         {0, 1, 3, 0,            /* 0xca */
1489                 {{1, 1},
1490                 {3, 3},
1491                 {6, 7},
1492                 {0, 0}
1493                 }
1494         },
1495         {1, 1, 3, 0,            /* 0xcb */
1496                 {{0, 1},
1497                 {3, 3},
1498                 {6, 7},
1499                 {0, 0}
1500                 }
1501         },
1502         {0, 1, 2, 0,            /* 0xcc */
1503                 {{2, 3},
1504                 {6, 7},
1505                 {0, 0},
1506                 {0, 0}
1507                 }
1508         },
1509         {1, 1, 3, 0,            /* 0xcd */
1510                 {{0, 0},
1511                 {2, 3},
1512                 {6, 7},
1513                 {0, 0}
1514                 }
1515         },
1516         {0, 1, 2, 0,            /* 0xce */
1517                 {{1, 3},
1518                 {6, 7},
1519                 {0, 0},
1520                 {0, 0}
1521                 }
1522         },
1523         {1, 1, 2, 0,            /* 0xcf */
1524                 {{0, 3},
1525                 {6, 7},
1526                 {0, 0},
1527                 {0, 0}
1528                 }
1529         },
1530         {0, 1, 2, 0,            /* 0xd0 */
1531                 {{4, 4},
1532                 {6, 7},
1533                 {0, 0},
1534                 {0, 0}
1535                 }
1536         },
1537         {1, 1, 3, 0,            /* 0xd1 */
1538                 {{0, 0},
1539                 {4, 4},
1540                 {6, 7},
1541                 {0, 0}
1542                 }
1543         },
1544         {0, 1, 3, 0,            /* 0xd2 */
1545                 {{1, 1},
1546                 {4, 4},
1547                 {6, 7},
1548                 {0, 0}
1549                 }
1550         },
1551         {1, 1, 3, 0,            /* 0xd3 */
1552                 {{0, 1},
1553                 {4, 4},
1554                 {6, 7},
1555                 {0, 0}
1556                 }
1557         },
1558         {0, 1, 3, 0,            /* 0xd4 */
1559                 {{2, 2},
1560                 {4, 4},
1561                 {6, 7},
1562                 {0, 0}
1563                 }
1564         },
1565         {1, 1, 4, 0,            /* 0xd5 */
1566                 {{0, 0},
1567                 {2, 2},
1568                 {4, 4},
1569                 {6, 7}
1570                 }
1571         },
1572         {0, 1, 3, 0,            /* 0xd6 */
1573                 {{1, 2},
1574                 {4, 4},
1575                 {6, 7},
1576                 {0, 0}
1577                 }
1578         },
1579         {1, 1, 3, 0,            /* 0xd7 */
1580                 {{0, 2},
1581                 {4, 4},
1582                 {6, 7},
1583                 {0, 0}
1584                 }
1585         },
1586         {0, 1, 2, 0,            /* 0xd8 */
1587                 {{3, 4},
1588                 {6, 7},
1589                 {0, 0},
1590                 {0, 0}
1591                 }
1592         },
1593         {1, 1, 3, 0,            /* 0xd9 */
1594                 {{0, 0},
1595                 {3, 4},
1596                 {6, 7},
1597                 {0, 0}
1598                 }
1599         },
1600         {0, 1, 3, 0,            /* 0xda */
1601                 {{1, 1},
1602                 {3, 4},
1603                 {6, 7},
1604                 {0, 0}
1605                 }
1606         },
1607         {1, 1, 3, 0,            /* 0xdb */
1608                 {{0, 1},
1609                 {3, 4},
1610                 {6, 7},
1611                 {0, 0}
1612                 }
1613         },
1614         {0, 1, 2, 0,            /* 0xdc */
1615                 {{2, 4},
1616                 {6, 7},
1617                 {0, 0},
1618                 {0, 0}
1619                 }
1620         },
1621         {1, 1, 3, 0,            /* 0xdd */
1622                 {{0, 0},
1623                 {2, 4},
1624                 {6, 7},
1625                 {0, 0}
1626                 }
1627         },
1628         {0, 1, 2, 0,            /* 0xde */
1629                 {{1, 4},
1630                 {6, 7},
1631                 {0, 0},
1632                 {0, 0}
1633                 }
1634         },
1635         {1, 1, 2, 0,            /* 0xdf */
1636                 {{0, 4},
1637                 {6, 7},
1638                 {0, 0},
1639                 {0, 0}
1640                 }
1641         },
1642         {0, 1, 1, 0,            /* 0xe0 */
1643                 {{5, 7},
1644                 {0, 0},
1645                 {0, 0},
1646                 {0, 0}
1647                 }
1648         },
1649         {1, 1, 2, 0,            /* 0xe1 */
1650                 {{0, 0},
1651                 {5, 7},
1652                 {0, 0},
1653                 {0, 0}
1654                 }
1655         },
1656         {0, 1, 2, 0,            /* 0xe2 */
1657                 {{1, 1},
1658                 {5, 7},
1659                 {0, 0},
1660                 {0, 0}
1661                 }
1662         },
1663         {1, 1, 2, 0,            /* 0xe3 */
1664                 {{0, 1},
1665                 {5, 7},
1666                 {0, 0},
1667                 {0, 0}
1668                 }
1669         },
1670         {0, 1, 2, 0,            /* 0xe4 */
1671                 {{2, 2},
1672                 {5, 7},
1673                 {0, 0},
1674                 {0, 0}
1675                 }
1676         },
1677         {1, 1, 3, 0,            /* 0xe5 */
1678                 {{0, 0},
1679                 {2, 2},
1680                 {5, 7},
1681                 {0, 0}
1682                 }
1683         },
1684         {0, 1, 2, 0,            /* 0xe6 */
1685                 {{1, 2},
1686                 {5, 7},
1687                 {0, 0},
1688                 {0, 0}
1689                 }
1690         },
1691         {1, 1, 2, 0,            /* 0xe7 */
1692                 {{0, 2},
1693                 {5, 7},
1694                 {0, 0},
1695                 {0, 0}
1696                 }
1697         },
1698         {0, 1, 2, 0,            /* 0xe8 */
1699                 {{3, 3},
1700                 {5, 7},
1701                 {0, 0},
1702                 {0, 0}
1703                 }
1704         },
1705         {1, 1, 3, 0,            /* 0xe9 */
1706                 {{0, 0},
1707                 {3, 3},
1708                 {5, 7},
1709                 {0, 0}
1710                 }
1711         },
1712         {0, 1, 3, 0,            /* 0xea */
1713                 {{1, 1},
1714                 {3, 3},
1715                 {5, 7},
1716                 {0, 0}
1717                 }
1718         },
1719         {1, 1, 3, 0,            /* 0xeb */
1720                 {{0, 1},
1721                 {3, 3},
1722                 {5, 7},
1723                 {0, 0}
1724                 }
1725         },
1726         {0, 1, 2, 0,            /* 0xec */
1727                 {{2, 3},
1728                 {5, 7},
1729                 {0, 0},
1730                 {0, 0}
1731                 }
1732         },
1733         {1, 1, 3, 0,            /* 0xed */
1734                 {{0, 0},
1735                 {2, 3},
1736                 {5, 7},
1737                 {0, 0}
1738                 }
1739         },
1740         {0, 1, 2, 0,            /* 0xee */
1741                 {{1, 3},
1742                 {5, 7},
1743                 {0, 0},
1744                 {0, 0}
1745                 }
1746         },
1747         {1, 1, 2, 0,            /* 0xef */
1748                 {{0, 3},
1749                 {5, 7},
1750                 {0, 0},
1751                 {0, 0}
1752                 }
1753         },
1754         {0, 1, 1, 0,            /* 0xf0 */
1755                 {{4, 7},
1756                 {0, 0},
1757                 {0, 0},
1758                 {0, 0}
1759                 }
1760         },
1761         {1, 1, 2, 0,            /* 0xf1 */
1762                 {{0, 0},
1763                 {4, 7},
1764                 {0, 0},
1765                 {0, 0}
1766                 }
1767         },
1768         {0, 1, 2, 0,            /* 0xf2 */
1769                 {{1, 1},
1770                 {4, 7},
1771                 {0, 0},
1772                 {0, 0}
1773                 }
1774         },
1775         {1, 1, 2, 0,            /* 0xf3 */
1776                 {{0, 1},
1777                 {4, 7},
1778                 {0, 0},
1779                 {0, 0}
1780                 }
1781         },
1782         {0, 1, 2, 0,            /* 0xf4 */
1783                 {{2, 2},
1784                 {4, 7},
1785                 {0, 0},
1786                 {0, 0}
1787                 }
1788         },
1789         {1, 1, 3, 0,            /* 0xf5 */
1790                 {{0, 0},
1791                 {2, 2},
1792                 {4, 7},
1793                 {0, 0}
1794                 }
1795         },
1796         {0, 1, 2, 0,            /* 0xf6 */
1797                 {{1, 2},
1798                 {4, 7},
1799                 {0, 0},
1800                 {0, 0}
1801                 }
1802         },
1803         {1, 1, 2, 0,            /* 0xf7 */
1804                 {{0, 2},
1805                 {4, 7},
1806                 {0, 0},
1807                 {0, 0}
1808                 }
1809         },
1810         {0, 1, 1, 0,            /* 0xf8 */
1811                 {{3, 7},
1812                 {0, 0},
1813                 {0, 0},
1814                 {0, 0}
1815                 }
1816         },
1817         {1, 1, 2, 0,            /* 0xf9 */
1818                 {{0, 0},
1819                 {3, 7},
1820                 {0, 0},
1821                 {0, 0}
1822                 }
1823         },
1824         {0, 1, 2, 0,            /* 0xfa */
1825                 {{1, 1},
1826                 {3, 7},
1827                 {0, 0},
1828                 {0, 0}
1829                 }
1830         },
1831         {1, 1, 2, 0,            /* 0xfb */
1832                 {{0, 1},
1833                 {3, 7},
1834                 {0, 0},
1835                 {0, 0}
1836                 }
1837         },
1838         {0, 1, 1, 0,            /* 0xfc */
1839                 {{2, 7},
1840                 {0, 0},
1841                 {0, 0},
1842                 {0, 0}
1843                 }
1844         },
1845         {1, 1, 2, 0,            /* 0xfd */
1846                 {{0, 0},
1847                 {2, 7},
1848                 {0, 0},
1849                 {0, 0}
1850                 }
1851         },
1852         {0, 1, 1, 0,            /* 0xfe */
1853                 {{1, 7},
1854                 {0, 0},
1855                 {0, 0},
1856                 {0, 0}
1857                 }
1858         },
1859         {1, 1, 1, 0,            /* 0xff */
1860                 {{0, 7},
1861                 {0, 0},
1862                 {0, 0},
1863                 {0, 0}
1864                 }
1865         }
1866 };
1867
1868
1869 int
1870 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1871     struct sctp_scoping *scope,
1872     int do_update)
1873 {
1874         if ((scope->loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (scope->ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = &ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((scope->ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (scope->ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = &ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((scope->site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1944 {
1945 #if defined(INET) || defined(INET6)
1946         struct sctp_paramhdr *paramh;
1947         struct mbuf *mret;
1948         uint16_t plen;
1949 #endif
1950
1951         switch (ifa->address.sa.sa_family) {
1952 #ifdef INET
1953         case AF_INET:
1954                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1955                 break;
1956 #endif
1957 #ifdef INET6
1958         case AF_INET6:
1959                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1960                 break;
1961 #endif
1962         default:
1963                 return (m);
1964         }
1965 #if defined(INET) || defined(INET6)
1966         if (M_TRAILINGSPACE(m) >= plen) {
1967                 /* easy side we just drop it on the end */
1968                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1969                 mret = m;
1970         } else {
1971                 /* Need more space */
1972                 mret = m;
1973                 while (SCTP_BUF_NEXT(mret) != NULL) {
1974                         mret = SCTP_BUF_NEXT(mret);
1975                 }
1976                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1977                 if (SCTP_BUF_NEXT(mret) == NULL) {
1978                         /* We are hosed, can't add more addresses */
1979                         return (m);
1980                 }
1981                 mret = SCTP_BUF_NEXT(mret);
1982                 paramh = mtod(mret, struct sctp_paramhdr *);
1983         }
1984         /* now add the parameter */
1985         switch (ifa->address.sa.sa_family) {
1986 #ifdef INET
1987         case AF_INET:
1988                 {
1989                         struct sctp_ipv4addr_param *ipv4p;
1990                         struct sockaddr_in *sin;
1991
1992                         sin = &ifa->address.sin;
1993                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1994                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1995                         paramh->param_length = htons(plen);
1996                         ipv4p->addr = sin->sin_addr.s_addr;
1997                         SCTP_BUF_LEN(mret) += plen;
1998                         break;
1999                 }
2000 #endif
2001 #ifdef INET6
2002         case AF_INET6:
2003                 {
2004                         struct sctp_ipv6addr_param *ipv6p;
2005                         struct sockaddr_in6 *sin6;
2006
2007                         sin6 = &ifa->address.sin6;
2008                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2009                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2010                         paramh->param_length = htons(plen);
2011                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2012                             sizeof(ipv6p->addr));
2013                         /* clear embedded scope in the address */
2014                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2015                         SCTP_BUF_LEN(mret) += plen;
2016                         break;
2017                 }
2018 #endif
2019         default:
2020                 return (m);
2021         }
2022         if (len != NULL) {
2023                 *len += plen;
2024         }
2025         return (mret);
2026 #endif
2027 }
2028
2029
2030 struct mbuf *
2031 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2032     struct sctp_scoping *scope,
2033     struct mbuf *m_at, int cnt_inits_to,
2034     uint16_t *padding_len, uint16_t *chunk_len)
2035 {
2036         struct sctp_vrf *vrf = NULL;
2037         int cnt, limit_out = 0, total_count;
2038         uint32_t vrf_id;
2039
2040         vrf_id = inp->def_vrf_id;
2041         SCTP_IPI_ADDR_RLOCK();
2042         vrf = sctp_find_vrf(vrf_id);
2043         if (vrf == NULL) {
2044                 SCTP_IPI_ADDR_RUNLOCK();
2045                 return (m_at);
2046         }
2047         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2048                 struct sctp_ifa *sctp_ifap;
2049                 struct sctp_ifn *sctp_ifnp;
2050
2051                 cnt = cnt_inits_to;
2052                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2053                         limit_out = 1;
2054                         cnt = SCTP_ADDRESS_LIMIT;
2055                         goto skip_count;
2056                 }
2057                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2058                         if ((scope->loopback_scope == 0) &&
2059                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2060                                 /*
2061                                  * Skip loopback devices if loopback_scope
2062                                  * not set
2063                                  */
2064                                 continue;
2065                         }
2066                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2067 #ifdef INET
2068                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2069                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2070                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2071                                         continue;
2072                                 }
2073 #endif
2074 #ifdef INET6
2075                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2076                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2077                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2078                                         continue;
2079                                 }
2080 #endif
2081                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2082                                         continue;
2083                                 }
2084                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2085                                         continue;
2086                                 }
2087                                 cnt++;
2088                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2089                                         break;
2090                                 }
2091                         }
2092                         if (cnt > SCTP_ADDRESS_LIMIT) {
2093                                 break;
2094                         }
2095                 }
2096 skip_count:
2097                 if (cnt > 1) {
2098                         total_count = 0;
2099                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2100                                 cnt = 0;
2101                                 if ((scope->loopback_scope == 0) &&
2102                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2103                                         /*
2104                                          * Skip loopback devices if
2105                                          * loopback_scope not set
2106                                          */
2107                                         continue;
2108                                 }
2109                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2110 #ifdef INET
2111                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2112                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2113                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2114                                                 continue;
2115                                         }
2116 #endif
2117 #ifdef INET6
2118                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2119                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2120                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2121                                                 continue;
2122                                         }
2123 #endif
2124                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2125                                                 continue;
2126                                         }
2127                                         if (sctp_is_address_in_scope(sctp_ifap,
2128                                             scope, 0) == 0) {
2129                                                 continue;
2130                                         }
2131                                         if ((chunk_len != NULL) &&
2132                                             (padding_len != NULL) &&
2133                                             (*padding_len > 0)) {
2134                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2135                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2136                                                 *chunk_len += *padding_len;
2137                                                 *padding_len = 0;
2138                                         }
2139                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2140                                         if (limit_out) {
2141                                                 cnt++;
2142                                                 total_count++;
2143                                                 if (cnt >= 2) {
2144                                                         /*
2145                                                          * two from each
2146                                                          * address
2147                                                          */
2148                                                         break;
2149                                                 }
2150                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2151                                                         /* No more addresses */
2152                                                         break;
2153                                                 }
2154                                         }
2155                                 }
2156                         }
2157                 }
2158         } else {
2159                 struct sctp_laddr *laddr;
2160
2161                 cnt = cnt_inits_to;
2162                 /* First, how many ? */
2163                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2164                         if (laddr->ifa == NULL) {
2165                                 continue;
2166                         }
2167                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2168                                 /*
2169                                  * Address being deleted by the system, dont
2170                                  * list.
2171                                  */
2172                                 continue;
2173                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2174                                 /*
2175                                  * Address being deleted on this ep don't
2176                                  * list.
2177                                  */
2178                                 continue;
2179                         }
2180                         if (sctp_is_address_in_scope(laddr->ifa,
2181                             scope, 1) == 0) {
2182                                 continue;
2183                         }
2184                         cnt++;
2185                 }
2186                 /*
2187                  * To get through a NAT we only list addresses if we have
2188                  * more than one. That way if you just bind a single address
2189                  * we let the source of the init dictate our address.
2190                  */
2191                 if (cnt > 1) {
2192                         cnt = cnt_inits_to;
2193                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2194                                 if (laddr->ifa == NULL) {
2195                                         continue;
2196                                 }
2197                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2198                                         continue;
2199                                 }
2200                                 if (sctp_is_address_in_scope(laddr->ifa,
2201                                     scope, 0) == 0) {
2202                                         continue;
2203                                 }
2204                                 if ((chunk_len != NULL) &&
2205                                     (padding_len != NULL) &&
2206                                     (*padding_len > 0)) {
2207                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2208                                         SCTP_BUF_LEN(m_at) += *padding_len;
2209                                         *chunk_len += *padding_len;
2210                                         *padding_len = 0;
2211                                 }
2212                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2213                                 cnt++;
2214                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2215                                         break;
2216                                 }
2217                         }
2218                 }
2219         }
2220         SCTP_IPI_ADDR_RUNLOCK();
2221         return (m_at);
2222 }
2223
2224 static struct sctp_ifa *
2225 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2226     uint8_t dest_is_loop,
2227     uint8_t dest_is_priv,
2228     sa_family_t fam)
2229 {
2230         uint8_t dest_is_global = 0;
2231
2232         /* dest_is_priv is true if destination is a private address */
2233         /* dest_is_loop is true if destination is a loopback addresses */
2234
2235         /**
2236          * Here we determine if its a preferred address. A preferred address
2237          * means it is the same scope or higher scope then the destination.
2238          * L = loopback, P = private, G = global
2239          * -----------------------------------------
2240          *    src    |  dest | result
2241          *  ----------------------------------------
2242          *     L     |    L  |    yes
2243          *  -----------------------------------------
2244          *     P     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     G     |    L  |    yes-v4 no-v6
2247          *  -----------------------------------------
2248          *     L     |    P  |    no
2249          *  -----------------------------------------
2250          *     P     |    P  |    yes
2251          *  -----------------------------------------
2252          *     G     |    P  |    no
2253          *   -----------------------------------------
2254          *     L     |    G  |    no
2255          *   -----------------------------------------
2256          *     P     |    G  |    no
2257          *    -----------------------------------------
2258          *     G     |    G  |    yes
2259          *    -----------------------------------------
2260          */
2261
2262         if (ifa->address.sa.sa_family != fam) {
2263                 /* forget mis-matched family */
2264                 return (NULL);
2265         }
2266         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2267                 dest_is_global = 1;
2268         }
2269         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2270         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2271         /* Ok the address may be ok */
2272 #ifdef INET6
2273         if (fam == AF_INET6) {
2274                 /* ok to use deprecated addresses? no lets not! */
2275                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2276                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2277                         return (NULL);
2278                 }
2279                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2280                         if (dest_is_loop) {
2281                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2282                                 return (NULL);
2283                         }
2284                 }
2285                 if (ifa->src_is_glob) {
2286                         if (dest_is_loop) {
2287                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2288                                 return (NULL);
2289                         }
2290                 }
2291         }
2292 #endif
2293         /*
2294          * Now that we know what is what, implement or table this could in
2295          * theory be done slicker (it used to be), but this is
2296          * straightforward and easier to validate :-)
2297          */
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2299             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2300         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2301             dest_is_loop, dest_is_priv, dest_is_global);
2302
2303         if ((ifa->src_is_loop) && (dest_is_priv)) {
2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2305                 return (NULL);
2306         }
2307         if ((ifa->src_is_glob) && (dest_is_priv)) {
2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2309                 return (NULL);
2310         }
2311         if ((ifa->src_is_loop) && (dest_is_global)) {
2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2313                 return (NULL);
2314         }
2315         if ((ifa->src_is_priv) && (dest_is_global)) {
2316                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2317                 return (NULL);
2318         }
2319         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2320         /* its a preferred address */
2321         return (ifa);
2322 }
2323
2324 static struct sctp_ifa *
2325 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2326     uint8_t dest_is_loop,
2327     uint8_t dest_is_priv,
2328     sa_family_t fam)
2329 {
2330         uint8_t dest_is_global = 0;
2331
2332         /**
2333          * Here we determine if its a acceptable address. A acceptable
2334          * address means it is the same scope or higher scope but we can
2335          * allow for NAT which means its ok to have a global dest and a
2336          * private src.
2337          *
2338          * L = loopback, P = private, G = global
2339          * -----------------------------------------
2340          *  src    |  dest | result
2341          * -----------------------------------------
2342          *   L     |   L   |    yes
2343          *  -----------------------------------------
2344          *   P     |   L   |    yes-v4 no-v6
2345          *  -----------------------------------------
2346          *   G     |   L   |    yes
2347          * -----------------------------------------
2348          *   L     |   P   |    no
2349          * -----------------------------------------
2350          *   P     |   P   |    yes
2351          * -----------------------------------------
2352          *   G     |   P   |    yes - May not work
2353          * -----------------------------------------
2354          *   L     |   G   |    no
2355          * -----------------------------------------
2356          *   P     |   G   |    yes - May not work
2357          * -----------------------------------------
2358          *   G     |   G   |    yes
2359          * -----------------------------------------
2360          */
2361
2362         if (ifa->address.sa.sa_family != fam) {
2363                 /* forget non matching family */
2364                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2365                     ifa->address.sa.sa_family, fam);
2366                 return (NULL);
2367         }
2368         /* Ok the address may be ok */
2369         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2370         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2371             dest_is_loop, dest_is_priv);
2372         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2373                 dest_is_global = 1;
2374         }
2375 #ifdef INET6
2376         if (fam == AF_INET6) {
2377                 /* ok to use deprecated addresses? */
2378                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2379                         return (NULL);
2380                 }
2381                 if (ifa->src_is_priv) {
2382                         /* Special case, linklocal to loop */
2383                         if (dest_is_loop)
2384                                 return (NULL);
2385                 }
2386         }
2387 #endif
2388         /*
2389          * Now that we know what is what, implement our table. This could in
2390          * theory be done slicker (it used to be), but this is
2391          * straightforward and easier to validate :-)
2392          */
2393         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2394             ifa->src_is_loop,
2395             dest_is_priv);
2396         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2397                 return (NULL);
2398         }
2399         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2400             ifa->src_is_loop,
2401             dest_is_global);
2402         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2403                 return (NULL);
2404         }
2405         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2406         /* its an acceptable address */
2407         return (ifa);
2408 }
2409
2410 int
2411 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2412 {
2413         struct sctp_laddr *laddr;
2414
2415         if (stcb == NULL) {
2416                 /* There are no restrictions, no TCB :-) */
2417                 return (0);
2418         }
2419         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2420                 if (laddr->ifa == NULL) {
2421                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2422                             __func__);
2423                         continue;
2424                 }
2425                 if (laddr->ifa == ifa) {
2426                         /* Yes it is on the list */
2427                         return (1);
2428                 }
2429         }
2430         return (0);
2431 }
2432
2433
2434 int
2435 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2436 {
2437         struct sctp_laddr *laddr;
2438
2439         if (ifa == NULL)
2440                 return (0);
2441         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2442                 if (laddr->ifa == NULL) {
2443                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2444                             __func__);
2445                         continue;
2446                 }
2447                 if ((laddr->ifa == ifa) && laddr->action == 0)
2448                         /* same pointer */
2449                         return (1);
2450         }
2451         return (0);
2452 }
2453
2454
2455
2456 static struct sctp_ifa *
2457 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2458     sctp_route_t *ro,
2459     uint32_t vrf_id,
2460     int non_asoc_addr_ok,
2461     uint8_t dest_is_priv,
2462     uint8_t dest_is_loop,
2463     sa_family_t fam)
2464 {
2465         struct sctp_laddr *laddr, *starting_point;
2466         void *ifn;
2467         int resettotop = 0;
2468         struct sctp_ifn *sctp_ifn;
2469         struct sctp_ifa *sctp_ifa, *sifa;
2470         struct sctp_vrf *vrf;
2471         uint32_t ifn_index;
2472
2473         vrf = sctp_find_vrf(vrf_id);
2474         if (vrf == NULL)
2475                 return (NULL);
2476
2477         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2478         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2479         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2480         /*
2481          * first question, is the ifn we will emit on in our list, if so, we
2482          * want such an address. Note that we first looked for a preferred
2483          * address.
2484          */
2485         if (sctp_ifn) {
2486                 /* is a preferred one on the interface we route out? */
2487                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2488 #ifdef INET
2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2490                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2491                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2492                                 continue;
2493                         }
2494 #endif
2495 #ifdef INET6
2496                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2497                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2498                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2499                                 continue;
2500                         }
2501 #endif
2502                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2503                             (non_asoc_addr_ok == 0))
2504                                 continue;
2505                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2506                             dest_is_loop,
2507                             dest_is_priv, fam);
2508                         if (sifa == NULL)
2509                                 continue;
2510                         if (sctp_is_addr_in_ep(inp, sifa)) {
2511                                 atomic_add_int(&sifa->refcount, 1);
2512                                 return (sifa);
2513                         }
2514                 }
2515         }
2516         /*
2517          * ok, now we now need to find one on the list of the addresses. We
2518          * can't get one on the emitting interface so let's find first a
2519          * preferred one. If not that an acceptable one otherwise... we
2520          * return NULL.
2521          */
2522         starting_point = inp->next_addr_touse;
2523 once_again:
2524         if (inp->next_addr_touse == NULL) {
2525                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2526                 resettotop = 1;
2527         }
2528         for (laddr = inp->next_addr_touse; laddr;
2529             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2530                 if (laddr->ifa == NULL) {
2531                         /* address has been removed */
2532                         continue;
2533                 }
2534                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2535                         /* address is being deleted */
2536                         continue;
2537                 }
2538                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2539                     dest_is_priv, fam);
2540                 if (sifa == NULL)
2541                         continue;
2542                 atomic_add_int(&sifa->refcount, 1);
2543                 return (sifa);
2544         }
2545         if (resettotop == 0) {
2546                 inp->next_addr_touse = NULL;
2547                 goto once_again;
2548         }
2549
2550         inp->next_addr_touse = starting_point;
2551         resettotop = 0;
2552 once_again_too:
2553         if (inp->next_addr_touse == NULL) {
2554                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2555                 resettotop = 1;
2556         }
2557
2558         /* ok, what about an acceptable address in the inp */
2559         for (laddr = inp->next_addr_touse; laddr;
2560             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2561                 if (laddr->ifa == NULL) {
2562                         /* address has been removed */
2563                         continue;
2564                 }
2565                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2566                         /* address is being deleted */
2567                         continue;
2568                 }
2569                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2570                     dest_is_priv, fam);
2571                 if (sifa == NULL)
2572                         continue;
2573                 atomic_add_int(&sifa->refcount, 1);
2574                 return (sifa);
2575         }
2576         if (resettotop == 0) {
2577                 inp->next_addr_touse = NULL;
2578                 goto once_again_too;
2579         }
2580
2581         /*
2582          * no address bound can be a source for the destination we are in
2583          * trouble
2584          */
2585         return (NULL);
2586 }
2587
2588
2589
2590 static struct sctp_ifa *
2591 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2592     struct sctp_tcb *stcb,
2593     sctp_route_t *ro,
2594     uint32_t vrf_id,
2595     uint8_t dest_is_priv,
2596     uint8_t dest_is_loop,
2597     int non_asoc_addr_ok,
2598     sa_family_t fam)
2599 {
2600         struct sctp_laddr *laddr, *starting_point;
2601         void *ifn;
2602         struct sctp_ifn *sctp_ifn;
2603         struct sctp_ifa *sctp_ifa, *sifa;
2604         uint8_t start_at_beginning = 0;
2605         struct sctp_vrf *vrf;
2606         uint32_t ifn_index;
2607
2608         /*
2609          * first question, is the ifn we will emit on in our list, if so, we
2610          * want that one.
2611          */
2612         vrf = sctp_find_vrf(vrf_id);
2613         if (vrf == NULL)
2614                 return (NULL);
2615
2616         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2617         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2618         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2619
2620         /*
2621          * first question, is the ifn we will emit on in our list?  If so,
2622          * we want that one. First we look for a preferred. Second, we go
2623          * for an acceptable.
2624          */
2625         if (sctp_ifn) {
2626                 /* first try for a preferred address on the ep */
2627                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2628 #ifdef INET
2629                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2630                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2631                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2632                                 continue;
2633                         }
2634 #endif
2635 #ifdef INET6
2636                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2637                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2638                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2639                                 continue;
2640                         }
2641 #endif
2642                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2643                                 continue;
2644                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2645                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2646                                 if (sifa == NULL)
2647                                         continue;
2648                                 if (((non_asoc_addr_ok == 0) &&
2649                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2650                                     (non_asoc_addr_ok &&
2651                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2652                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2653                                         /* on the no-no list */
2654                                         continue;
2655                                 }
2656                                 atomic_add_int(&sifa->refcount, 1);
2657                                 return (sifa);
2658                         }
2659                 }
2660                 /* next try for an acceptable address on the ep */
2661                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2662 #ifdef INET
2663                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2664                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2665                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2666                                 continue;
2667                         }
2668 #endif
2669 #ifdef INET6
2670                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2671                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2672                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2673                                 continue;
2674                         }
2675 #endif
2676                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2677                                 continue;
2678                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2679                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2680                                 if (sifa == NULL)
2681                                         continue;
2682                                 if (((non_asoc_addr_ok == 0) &&
2683                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2684                                     (non_asoc_addr_ok &&
2685                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2686                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2687                                         /* on the no-no list */
2688                                         continue;
2689                                 }
2690                                 atomic_add_int(&sifa->refcount, 1);
2691                                 return (sifa);
2692                         }
2693                 }
2694
2695         }
2696         /*
2697          * if we can't find one like that then we must look at all addresses
2698          * bound to pick one at first preferable then secondly acceptable.
2699          */
2700         starting_point = stcb->asoc.last_used_address;
2701 sctp_from_the_top:
2702         if (stcb->asoc.last_used_address == NULL) {
2703                 start_at_beginning = 1;
2704                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2705         }
2706         /* search beginning with the last used address */
2707         for (laddr = stcb->asoc.last_used_address; laddr;
2708             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2709                 if (laddr->ifa == NULL) {
2710                         /* address has been removed */
2711                         continue;
2712                 }
2713                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2714                         /* address is being deleted */
2715                         continue;
2716                 }
2717                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2718                 if (sifa == NULL)
2719                         continue;
2720                 if (((non_asoc_addr_ok == 0) &&
2721                     (sctp_is_addr_restricted(stcb, sifa))) ||
2722                     (non_asoc_addr_ok &&
2723                     (sctp_is_addr_restricted(stcb, sifa)) &&
2724                     (!sctp_is_addr_pending(stcb, sifa)))) {
2725                         /* on the no-no list */
2726                         continue;
2727                 }
2728                 stcb->asoc.last_used_address = laddr;
2729                 atomic_add_int(&sifa->refcount, 1);
2730                 return (sifa);
2731         }
2732         if (start_at_beginning == 0) {
2733                 stcb->asoc.last_used_address = NULL;
2734                 goto sctp_from_the_top;
2735         }
2736         /* now try for any higher scope than the destination */
2737         stcb->asoc.last_used_address = starting_point;
2738         start_at_beginning = 0;
2739 sctp_from_the_top2:
2740         if (stcb->asoc.last_used_address == NULL) {
2741                 start_at_beginning = 1;
2742                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2743         }
2744         /* search beginning with the last used address */
2745         for (laddr = stcb->asoc.last_used_address; laddr;
2746             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2747                 if (laddr->ifa == NULL) {
2748                         /* address has been removed */
2749                         continue;
2750                 }
2751                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2752                         /* address is being deleted */
2753                         continue;
2754                 }
2755                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2756                     dest_is_priv, fam);
2757                 if (sifa == NULL)
2758                         continue;
2759                 if (((non_asoc_addr_ok == 0) &&
2760                     (sctp_is_addr_restricted(stcb, sifa))) ||
2761                     (non_asoc_addr_ok &&
2762                     (sctp_is_addr_restricted(stcb, sifa)) &&
2763                     (!sctp_is_addr_pending(stcb, sifa)))) {
2764                         /* on the no-no list */
2765                         continue;
2766                 }
2767                 stcb->asoc.last_used_address = laddr;
2768                 atomic_add_int(&sifa->refcount, 1);
2769                 return (sifa);
2770         }
2771         if (start_at_beginning == 0) {
2772                 stcb->asoc.last_used_address = NULL;
2773                 goto sctp_from_the_top2;
2774         }
2775         return (NULL);
2776 }
2777
2778 static struct sctp_ifa *
2779 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2780     struct sctp_inpcb *inp,
2781     struct sctp_tcb *stcb,
2782     int non_asoc_addr_ok,
2783     uint8_t dest_is_loop,
2784     uint8_t dest_is_priv,
2785     int addr_wanted,
2786     sa_family_t fam,
2787     sctp_route_t *ro
2788 )
2789 {
2790         struct sctp_ifa *ifa, *sifa;
2791         int num_eligible_addr = 0;
2792 #ifdef INET6
2793         struct sockaddr_in6 sin6, lsa6;
2794
2795         if (fam == AF_INET6) {
2796                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2797                 (void)sa6_recoverscope(&sin6);
2798         }
2799 #endif                          /* INET6 */
2800         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2801 #ifdef INET
2802                 if ((ifa->address.sa.sa_family == AF_INET) &&
2803                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2804                     &ifa->address.sin.sin_addr) != 0)) {
2805                         continue;
2806                 }
2807 #endif
2808 #ifdef INET6
2809                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2810                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2811                     &ifa->address.sin6.sin6_addr) != 0)) {
2812                         continue;
2813                 }
2814 #endif
2815                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2816                     (non_asoc_addr_ok == 0))
2817                         continue;
2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819                     dest_is_priv, fam);
2820                 if (sifa == NULL)
2821                         continue;
2822 #ifdef INET6
2823                 if (fam == AF_INET6 &&
2824                     dest_is_loop &&
2825                     sifa->src_is_loop && sifa->src_is_priv) {
2826                         /*
2827                          * don't allow fe80::1 to be a src on loop ::1, we
2828                          * don't list it to the peer so we will get an
2829                          * abort.
2830                          */
2831                         continue;
2832                 }
2833                 if (fam == AF_INET6 &&
2834                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2835                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2836                         /*
2837                          * link-local <-> link-local must belong to the same
2838                          * scope.
2839                          */
2840                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2841                         (void)sa6_recoverscope(&lsa6);
2842                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2843                                 continue;
2844                         }
2845                 }
2846 #endif                          /* INET6 */
2847
2848                 /*
2849                  * Check if the IPv6 address matches to next-hop. In the
2850                  * mobile case, old IPv6 address may be not deleted from the
2851                  * interface. Then, the interface has previous and new
2852                  * addresses.  We should use one corresponding to the
2853                  * next-hop.  (by micchie)
2854                  */
2855 #ifdef INET6
2856                 if (stcb && fam == AF_INET6 &&
2857                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2858                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2859                             == 0) {
2860                                 continue;
2861                         }
2862                 }
2863 #endif
2864 #ifdef INET
2865                 /* Avoid topologically incorrect IPv4 address */
2866                 if (stcb && fam == AF_INET &&
2867                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2868                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2869                                 continue;
2870                         }
2871                 }
2872 #endif
2873                 if (stcb) {
2874                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2875                                 continue;
2876                         }
2877                         if (((non_asoc_addr_ok == 0) &&
2878                             (sctp_is_addr_restricted(stcb, sifa))) ||
2879                             (non_asoc_addr_ok &&
2880                             (sctp_is_addr_restricted(stcb, sifa)) &&
2881                             (!sctp_is_addr_pending(stcb, sifa)))) {
2882                                 /*
2883                                  * It is restricted for some reason..
2884                                  * probably not yet added.
2885                                  */
2886                                 continue;
2887                         }
2888                 }
2889                 if (num_eligible_addr >= addr_wanted) {
2890                         return (sifa);
2891                 }
2892                 num_eligible_addr++;
2893         }
2894         return (NULL);
2895 }
2896
2897
2898 static int
2899 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2900     struct sctp_inpcb *inp,
2901     struct sctp_tcb *stcb,
2902     int non_asoc_addr_ok,
2903     uint8_t dest_is_loop,
2904     uint8_t dest_is_priv,
2905     sa_family_t fam)
2906 {
2907         struct sctp_ifa *ifa, *sifa;
2908         int num_eligible_addr = 0;
2909
2910         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2911 #ifdef INET
2912                 if ((ifa->address.sa.sa_family == AF_INET) &&
2913                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2914                     &ifa->address.sin.sin_addr) != 0)) {
2915                         continue;
2916                 }
2917 #endif
2918 #ifdef INET6
2919                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2920                     (stcb != NULL) &&
2921                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2922                     &ifa->address.sin6.sin6_addr) != 0)) {
2923                         continue;
2924                 }
2925 #endif
2926                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2927                     (non_asoc_addr_ok == 0)) {
2928                         continue;
2929                 }
2930                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2931                     dest_is_priv, fam);
2932                 if (sifa == NULL) {
2933                         continue;
2934                 }
2935                 if (stcb) {
2936                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2937                                 continue;
2938                         }
2939                         if (((non_asoc_addr_ok == 0) &&
2940                             (sctp_is_addr_restricted(stcb, sifa))) ||
2941                             (non_asoc_addr_ok &&
2942                             (sctp_is_addr_restricted(stcb, sifa)) &&
2943                             (!sctp_is_addr_pending(stcb, sifa)))) {
2944                                 /*
2945                                  * It is restricted for some reason..
2946                                  * probably not yet added.
2947                                  */
2948                                 continue;
2949                         }
2950                 }
2951                 num_eligible_addr++;
2952         }
2953         return (num_eligible_addr);
2954 }
2955
2956 static struct sctp_ifa *
2957 sctp_choose_boundall(struct sctp_inpcb *inp,
2958     struct sctp_tcb *stcb,
2959     struct sctp_nets *net,
2960     sctp_route_t *ro,
2961     uint32_t vrf_id,
2962     uint8_t dest_is_priv,
2963     uint8_t dest_is_loop,
2964     int non_asoc_addr_ok,
2965     sa_family_t fam)
2966 {
2967         int cur_addr_num = 0, num_preferred = 0;
2968         void *ifn;
2969         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2970         struct sctp_ifa *sctp_ifa, *sifa;
2971         uint32_t ifn_index;
2972         struct sctp_vrf *vrf;
2973 #ifdef INET
2974         int retried = 0;
2975 #endif
2976
2977         /*-
2978          * For boundall we can use any address in the association.
2979          * If non_asoc_addr_ok is set we can use any address (at least in
2980          * theory). So we look for preferred addresses first. If we find one,
2981          * we use it. Otherwise we next try to get an address on the
2982          * interface, which we should be able to do (unless non_asoc_addr_ok
2983          * is false and we are routed out that way). In these cases where we
2984          * can't use the address of the interface we go through all the
2985          * ifn's looking for an address we can use and fill that in. Punting
2986          * means we send back address 0, which will probably cause problems
2987          * actually since then IP will fill in the address of the route ifn,
2988          * which means we probably already rejected it.. i.e. here comes an
2989          * abort :-<.
2990          */
2991         vrf = sctp_find_vrf(vrf_id);
2992         if (vrf == NULL)
2993                 return (NULL);
2994
2995         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2996         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2997         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2998         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2999         if (sctp_ifn == NULL) {
3000                 /* ?? We don't have this guy ?? */
3001                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3002                 goto bound_all_plan_b;
3003         }
3004         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3005             ifn_index, sctp_ifn->ifn_name);
3006
3007         if (net) {
3008                 cur_addr_num = net->indx_of_eligible_next_to_use;
3009         }
3010         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3011             inp, stcb,
3012             non_asoc_addr_ok,
3013             dest_is_loop,
3014             dest_is_priv, fam);
3015         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3016             num_preferred, sctp_ifn->ifn_name);
3017         if (num_preferred == 0) {
3018                 /*
3019                  * no eligible addresses, we must use some other interface
3020                  * address if we can find one.
3021                  */
3022                 goto bound_all_plan_b;
3023         }
3024         /*
3025          * Ok we have num_eligible_addr set with how many we can use, this
3026          * may vary from call to call due to addresses being deprecated
3027          * etc..
3028          */
3029         if (cur_addr_num >= num_preferred) {
3030                 cur_addr_num = 0;
3031         }
3032         /*
3033          * select the nth address from the list (where cur_addr_num is the
3034          * nth) and 0 is the first one, 1 is the second one etc...
3035          */
3036         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3037
3038         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3039             dest_is_priv, cur_addr_num, fam, ro);
3040
3041         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3042         if (sctp_ifa) {
3043                 atomic_add_int(&sctp_ifa->refcount, 1);
3044                 if (net) {
3045                         /* save off where the next one we will want */
3046                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3047                 }
3048                 return (sctp_ifa);
3049         }
3050         /*
3051          * plan_b: Look at all interfaces and find a preferred address. If
3052          * no preferred fall through to plan_c.
3053          */
3054 bound_all_plan_b:
3055         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3056         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3057                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3058                     sctp_ifn->ifn_name);
3059                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3060                         /* wrong base scope */
3061                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3062                         continue;
3063                 }
3064                 if ((sctp_ifn == looked_at) && looked_at) {
3065                         /* already looked at this guy */
3066                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3067                         continue;
3068                 }
3069                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3070                     dest_is_loop, dest_is_priv, fam);
3071                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3072                     "Found ifn:%p %d preferred source addresses\n",
3073                     ifn, num_preferred);
3074                 if (num_preferred == 0) {
3075                         /* None on this interface. */
3076                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3077                         continue;
3078                 }
3079                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3080                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3081                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3082
3083                 /*
3084                  * Ok we have num_eligible_addr set with how many we can
3085                  * use, this may vary from call to call due to addresses
3086                  * being deprecated etc..
3087                  */
3088                 if (cur_addr_num >= num_preferred) {
3089                         cur_addr_num = 0;
3090                 }
3091                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3092                     dest_is_priv, cur_addr_num, fam, ro);
3093                 if (sifa == NULL)
3094                         continue;
3095                 if (net) {
3096                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3098                             cur_addr_num);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3101                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3102                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3103                 }
3104                 atomic_add_int(&sifa->refcount, 1);
3105                 return (sifa);
3106         }
3107 #ifdef INET
3108 again_with_private_addresses_allowed:
3109 #endif
3110         /* plan_c: do we have an acceptable address on the emit interface */
3111         sifa = NULL;
3112         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3113         if (emit_ifn == NULL) {
3114                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3115                 goto plan_d;
3116         }
3117         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3118                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3119 #ifdef INET
3120                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3121                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3122                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3123                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3124                         continue;
3125                 }
3126 #endif
3127 #ifdef INET6
3128                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3129                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3130                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3132                         continue;
3133                 }
3134 #endif
3135                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3136                     (non_asoc_addr_ok == 0)) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3138                         continue;
3139                 }
3140                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3141                     dest_is_priv, fam);
3142                 if (sifa == NULL) {
3143                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3144                         continue;
3145                 }
3146                 if (stcb) {
3147                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3148                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3149                                 sifa = NULL;
3150                                 continue;
3151                         }
3152                         if (((non_asoc_addr_ok == 0) &&
3153                             (sctp_is_addr_restricted(stcb, sifa))) ||
3154                             (non_asoc_addr_ok &&
3155                             (sctp_is_addr_restricted(stcb, sifa)) &&
3156                             (!sctp_is_addr_pending(stcb, sifa)))) {
3157                                 /*
3158                                  * It is restricted for some reason..
3159                                  * probably not yet added.
3160                                  */
3161                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3162                                 sifa = NULL;
3163                                 continue;
3164                         }
3165                 }
3166                 atomic_add_int(&sifa->refcount, 1);
3167                 goto out;
3168         }
3169 plan_d:
3170         /*
3171          * plan_d: We are in trouble. No preferred address on the emit
3172          * interface. And not even a preferred address on all interfaces. Go
3173          * out and see if we can find an acceptable address somewhere
3174          * amongst all interfaces.
3175          */
3176         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179                         /* wrong base scope */
3180                         continue;
3181                 }
3182                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183 #ifdef INET
3184                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3187                                 continue;
3188                         }
3189 #endif
3190 #ifdef INET6
3191                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194                                 continue;
3195                         }
3196 #endif
3197                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198                             (non_asoc_addr_ok == 0))
3199                                 continue;
3200                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201                             dest_is_loop,
3202                             dest_is_priv, fam);
3203                         if (sifa == NULL)
3204                                 continue;
3205                         if (stcb) {
3206                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207                                         sifa = NULL;
3208                                         continue;
3209                                 }
3210                                 if (((non_asoc_addr_ok == 0) &&
3211                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3212                                     (non_asoc_addr_ok &&
3213                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3214                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3215                                         /*
3216                                          * It is restricted for some
3217                                          * reason.. probably not yet added.
3218                                          */
3219                                         sifa = NULL;
3220                                         continue;
3221                                 }
3222                         }
3223                         goto out;
3224                 }
3225         }
3226 #ifdef INET
3227         if (stcb) {
3228                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3229                         stcb->asoc.scope.ipv4_local_scope = 1;
3230                         retried = 1;
3231                         goto again_with_private_addresses_allowed;
3232                 } else if (retried == 1) {
3233                         stcb->asoc.scope.ipv4_local_scope = 0;
3234                 }
3235         }
3236 #endif
3237 out:
3238 #ifdef INET
3239         if (sifa) {
3240                 if (retried == 1) {
3241                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3242                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3243                                         /* wrong base scope */
3244                                         continue;
3245                                 }
3246                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3247                                         struct sctp_ifa *tmp_sifa;
3248
3249 #ifdef INET
3250                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3251                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3252                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3253                                                 continue;
3254                                         }
3255 #endif
3256 #ifdef INET6
3257                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3258                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3259                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3260                                                 continue;
3261                                         }
3262 #endif
3263                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3264                                             (non_asoc_addr_ok == 0))
3265                                                 continue;
3266                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3267                                             dest_is_loop,
3268                                             dest_is_priv, fam);
3269                                         if (tmp_sifa == NULL) {
3270                                                 continue;
3271                                         }
3272                                         if (tmp_sifa == sifa) {
3273                                                 continue;
3274                                         }
3275                                         if (stcb) {
3276                                                 if (sctp_is_address_in_scope(tmp_sifa,
3277                                                     &stcb->asoc.scope, 0) == 0) {
3278                                                         continue;
3279                                                 }
3280                                                 if (((non_asoc_addr_ok == 0) &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3282                                                     (non_asoc_addr_ok &&
3283                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3284                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3285                                                         /*
3286                                                          * It is restricted
3287                                                          * for some reason..
3288                                                          * probably not yet
3289                                                          * added.
3290                                                          */
3291                                                         continue;
3292                                                 }
3293                                         }
3294                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3295                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3296                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3297                                         }
3298                                 }
3299                         }
3300                 }
3301                 atomic_add_int(&sifa->refcount, 1);
3302         }
3303 #endif
3304         return (sifa);
3305 }
3306
3307
3308
3309 /* tcb may be NULL */
3310 struct sctp_ifa *
3311 sctp_source_address_selection(struct sctp_inpcb *inp,
3312     struct sctp_tcb *stcb,
3313     sctp_route_t *ro,
3314     struct sctp_nets *net,
3315     int non_asoc_addr_ok, uint32_t vrf_id)
3316 {
3317         struct sctp_ifa *answer;
3318         uint8_t dest_is_priv, dest_is_loop;
3319         sa_family_t fam;
3320 #ifdef INET
3321         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325 #endif
3326
3327         /**
3328          * Rules:
3329          * - Find the route if needed, cache if I can.
3330          * - Look at interface address in route, Is it in the bound list. If so we
3331          *   have the best source.
3332          * - If not we must rotate amongst the addresses.
3333          *
3334          * Cavets and issues
3335          *
3336          * Do we need to pay attention to scope. We can have a private address
3337          * or a global address we are sourcing or sending to. So if we draw
3338          * it out
3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340          * For V4
3341          * ------------------------------------------
3342          *      source     *      dest  *  result
3343          * -----------------------------------------
3344          * <a>  Private    *    Global  *  NAT
3345          * -----------------------------------------
3346          * <b>  Private    *    Private *  No problem
3347          * -----------------------------------------
3348          * <c>  Global     *    Private *  Huh, How will this work?
3349          * -----------------------------------------
3350          * <d>  Global     *    Global  *  No Problem
3351          *------------------------------------------
3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353          * For V6
3354          *------------------------------------------
3355          *      source     *      dest  *  result
3356          * -----------------------------------------
3357          * <a>  Linklocal  *    Global  *
3358          * -----------------------------------------
3359          * <b>  Linklocal  * Linklocal  *  No problem
3360          * -----------------------------------------
3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
3362          * -----------------------------------------
3363          * <d>  Global     *    Global  *  No Problem
3364          *------------------------------------------
3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366          *
3367          * And then we add to that what happens if there are multiple addresses
3368          * assigned to an interface. Remember the ifa on a ifn is a linked
3369          * list of addresses. So one interface can have more than one IP
3370          * address. What happens if we have both a private and a global
3371          * address? Do we then use context of destination to sort out which
3372          * one is best? And what about NAT's sending P->G may get you a NAT
3373          * translation, or should you select the G thats on the interface in
3374          * preference.
3375          *
3376          * Decisions:
3377          *
3378          * - count the number of addresses on the interface.
3379          * - if it is one, no problem except case <c>.
3380          *   For <a> we will assume a NAT out there.
3381          * - if there are more than one, then we need to worry about scope P
3382          *   or G. We should prefer G -> G and P -> P if possible.
3383          *   Then as a secondary fall back to mixed types G->P being a last
3384          *   ditch one.
3385          * - The above all works for bound all, but bound specific we need to
3386          *   use the same concept but instead only consider the bound
3387          *   addresses. If the bound set is NOT assigned to the interface then
3388          *   we must use rotation amongst the bound addresses..
3389          */
3390         if (ro->ro_rt == NULL) {
3391                 /*
3392                  * Need a route to cache.
3393                  */
3394                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3395         }
3396         if (ro->ro_rt == NULL) {
3397                 return (NULL);
3398         }
3399         fam = ro->ro_dst.sa_family;
3400         dest_is_priv = dest_is_loop = 0;
3401         /* Setup our scopes for the destination */
3402         switch (fam) {
3403 #ifdef INET
3404         case AF_INET:
3405                 /* Scope based on outbound address */
3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407                         dest_is_loop = 1;
3408                         if (net != NULL) {
3409                                 /* mark it as local */
3410                                 net->addr_is_local = 1;
3411                         }
3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413                         dest_is_priv = 1;
3414                 }
3415                 break;
3416 #endif
3417 #ifdef INET6
3418         case AF_INET6:
3419                 /* Scope based on outbound address */
3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422                         /*
3423                          * If the address is a loopback address, which
3424                          * consists of "::1" OR "fe80::1%lo0", we are
3425                          * loopback scope. But we don't use dest_is_priv
3426                          * (link local addresses).
3427                          */
3428                         dest_is_loop = 1;
3429                         if (net != NULL) {
3430                                 /* mark it as local */
3431                                 net->addr_is_local = 1;
3432                         }
3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434                         dest_is_priv = 1;
3435                 }
3436                 break;
3437 #endif
3438         }
3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441         SCTP_IPI_ADDR_RLOCK();
3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443                 /*
3444                  * Bound all case
3445                  */
3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447                     dest_is_priv, dest_is_loop,
3448                     non_asoc_addr_ok, fam);
3449                 SCTP_IPI_ADDR_RUNLOCK();
3450                 return (answer);
3451         }
3452         /*
3453          * Subset bound case
3454          */
3455         if (stcb) {
3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457                     vrf_id, dest_is_priv,
3458                     dest_is_loop,
3459                     non_asoc_addr_ok, fam);
3460         } else {
3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462                     non_asoc_addr_ok,
3463                     dest_is_priv,
3464                     dest_is_loop, fam);
3465         }
3466         SCTP_IPI_ADDR_RUNLOCK();
3467         return (answer);
3468 }
3469
3470 static int
3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472 {
3473         struct cmsghdr cmh;
3474         struct sctp_sndinfo sndinfo;
3475         struct sctp_prinfo prinfo;
3476         struct sctp_authinfo authinfo;
3477         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3478         int found;
3479
3480         /*
3481          * Independent of how many mbufs, find the c_type inside the control
3482          * structure and copy out the data.
3483          */
3484         found = 0;
3485         tot_len = SCTP_BUF_LEN(control);
3486         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3487                 rem_len = tot_len - off;
3488                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3489                         /* There is not enough room for one more. */
3490                         return (found);
3491                 }
3492                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494                         /* We dont't have a complete CMSG header. */
3495                         return (found);
3496                 }
3497                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3498                         /* We don't have the complete CMSG. */
3499                         return (found);
3500                 }
3501                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3502                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3503                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3504                     ((c_type == cmh.cmsg_type) ||
3505                     ((c_type == SCTP_SNDRCV) &&
3506                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3507                     (cmh.cmsg_type == SCTP_PRINFO) ||
3508                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3509                         if (c_type == cmh.cmsg_type) {
3510                                 if (cpsize > INT_MAX) {
3511                                         return (found);
3512                                 }
3513                                 if (cmsg_data_len < (int)cpsize) {
3514                                         return (found);
3515                                 }
3516                                 /* It is exactly what we want. Copy it out. */
3517                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3518                                 return (1);
3519                         } else {
3520                                 struct sctp_sndrcvinfo *sndrcvinfo;
3521
3522                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3523                                 if (found == 0) {
3524                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3525                                                 return (found);
3526                                         }
3527                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3528                                 }
3529                                 switch (cmh.cmsg_type) {
3530                                 case SCTP_SNDINFO:
3531                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3532                                                 return (found);
3533                                         }
3534                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3535                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3536                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3537                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3538                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3539                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3540                                         break;
3541                                 case SCTP_PRINFO:
3542                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3546                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3547                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3548                                         } else {
3549                                                 sndrcvinfo->sinfo_timetolive = 0;
3550                                         }
3551                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3552                                         break;
3553                                 case SCTP_AUTHINFO:
3554                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3555                                                 return (found);
3556                                         }
3557                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3558                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3559                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3560                                         break;
3561                                 default:
3562                                         return (found);
3563                                 }
3564                                 found = 1;
3565                         }
3566                 }
3567         }
3568         return (found);
3569 }
3570
3571 static int
3572 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3573 {
3574         struct cmsghdr cmh;
3575         int tlen, at;
3576         struct sctp_initmsg initmsg;
3577 #ifdef INET
3578         struct sockaddr_in sin;
3579 #endif
3580 #ifdef INET6
3581         struct sockaddr_in6 sin6;
3582 #endif
3583
3584         tlen = SCTP_BUF_LEN(control);
3585         at = 0;
3586         while (at < tlen) {
3587                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3588                         /* There is not enough room for one more. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3593                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3594                         /* We dont't have a complete CMSG header. */
3595                         *error = EINVAL;
3596                         return (1);
3597                 }
3598                 if (((int)cmh.cmsg_len + at) > tlen) {
3599                         /* We don't have the complete CMSG. */
3600                         *error = EINVAL;
3601                         return (1);
3602                 }
3603                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3604                         switch (cmh.cmsg_type) {
3605                         case SCTP_INIT:
3606                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3607                                         *error = EINVAL;
3608                                         return (1);
3609                                 }
3610                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3611                                 if (initmsg.sinit_max_attempts)
3612                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3613                                 if (initmsg.sinit_num_ostreams)
3614                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3615                                 if (initmsg.sinit_max_instreams)
3616                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3617                                 if (initmsg.sinit_max_init_timeo)
3618                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3619                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3620                                         struct sctp_stream_out *tmp_str;
3621                                         unsigned int i;
3622 #if defined(SCTP_DETAILED_STR_STATS)
3623                                         int j;
3624 #endif
3625
3626                                         /* Default is NOT correct */
3627                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3628                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3629                                         SCTP_TCB_UNLOCK(stcb);
3630                                         SCTP_MALLOC(tmp_str,
3631                                             struct sctp_stream_out *,
3632                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3633                                             SCTP_M_STRMO);
3634                                         SCTP_TCB_LOCK(stcb);
3635                                         if (tmp_str != NULL) {
3636                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3637                                                 stcb->asoc.strmout = tmp_str;
3638                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3639                                         } else {
3640                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3641                                         }
3642                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3643                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3644                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3645                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3646                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3647 #if defined(SCTP_DETAILED_STR_STATS)
3648                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3649                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3650                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3651                                                 }
3652 #else
3653                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3654                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3655 #endif
3656                                                 stcb->asoc.strmout[i].sid = i;
3657                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3658                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3659                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3660                                         }
3661                                 }
3662                                 break;
3663 #ifdef INET
3664                         case SCTP_DSTADDRV4:
3665                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3670                                 sin.sin_family = AF_INET;
3671                                 sin.sin_len = sizeof(struct sockaddr_in);
3672                                 sin.sin_port = stcb->rport;
3673                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3674                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3675                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3676                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3677                                         *error = EINVAL;
3678                                         return (1);
3679                                 }
3680                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3681                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3682                                         *error = ENOBUFS;
3683                                         return (1);
3684                                 }
3685                                 break;
3686 #endif
3687 #ifdef INET6
3688                         case SCTP_DSTADDRV6:
3689                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3690                                         *error = EINVAL;
3691                                         return (1);
3692                                 }
3693                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3694                                 sin6.sin6_family = AF_INET6;
3695                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3696                                 sin6.sin6_port = stcb->rport;
3697                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3698                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3699                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3700                                         *error = EINVAL;
3701                                         return (1);
3702                                 }
3703 #ifdef INET
3704                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3705                                         in6_sin6_2_sin(&sin, &sin6);
3706                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3707                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3708                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3709                                                 *error = EINVAL;
3710                                                 return (1);
3711                                         }
3712                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3713                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3714                                                 *error = ENOBUFS;
3715                                                 return (1);
3716                                         }
3717                                 } else
3718 #endif
3719                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3720                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3721                                         *error = ENOBUFS;
3722                                         return (1);
3723                                 }
3724                                 break;
3725 #endif
3726                         default:
3727                                 break;
3728                         }
3729                 }
3730                 at += CMSG_ALIGN(cmh.cmsg_len);
3731         }
3732         return (0);
3733 }
3734
3735 static struct sctp_tcb *
3736 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3737     uint16_t port,
3738     struct mbuf *control,
3739     struct sctp_nets **net_p,
3740     int *error)
3741 {
3742         struct cmsghdr cmh;
3743         int tlen, at;
3744         struct sctp_tcb *stcb;
3745         struct sockaddr *addr;
3746 #ifdef INET
3747         struct sockaddr_in sin;
3748 #endif
3749 #ifdef INET6
3750         struct sockaddr_in6 sin6;
3751 #endif
3752
3753         tlen = SCTP_BUF_LEN(control);
3754         at = 0;
3755         while (at < tlen) {
3756                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3757                         /* There is not enough room for one more. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3762                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3763                         /* We dont't have a complete CMSG header. */
3764                         *error = EINVAL;
3765                         return (NULL);
3766                 }
3767                 if (((int)cmh.cmsg_len + at) > tlen) {
3768                         /* We don't have the complete CMSG. */
3769                         *error = EINVAL;
3770                         return (NULL);
3771                 }
3772                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3773                         switch (cmh.cmsg_type) {
3774 #ifdef INET
3775                         case SCTP_DSTADDRV4:
3776                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3777                                         *error = EINVAL;
3778                                         return (NULL);
3779                                 }
3780                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3781                                 sin.sin_family = AF_INET;
3782                                 sin.sin_len = sizeof(struct sockaddr_in);
3783                                 sin.sin_port = port;
3784                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3785                                 addr = (struct sockaddr *)&sin;
3786                                 break;
3787 #endif
3788 #ifdef INET6
3789                         case SCTP_DSTADDRV6:
3790                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3791                                         *error = EINVAL;
3792                                         return (NULL);
3793                                 }
3794                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3795                                 sin6.sin6_family = AF_INET6;
3796                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3797                                 sin6.sin6_port = port;
3798                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3799 #ifdef INET
3800                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3801                                         in6_sin6_2_sin(&sin, &sin6);
3802                                         addr = (struct sockaddr *)&sin;
3803                                 } else
3804 #endif
3805                                         addr = (struct sockaddr *)&sin6;
3806                                 break;
3807 #endif
3808                         default:
3809                                 addr = NULL;
3810                                 break;
3811                         }
3812                         if (addr) {
3813                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3814                                 if (stcb != NULL) {
3815                                         return (stcb);
3816                                 }
3817                         }
3818                 }
3819                 at += CMSG_ALIGN(cmh.cmsg_len);
3820         }
3821         return (NULL);
3822 }
3823
3824 static struct mbuf *
3825 sctp_add_cookie(struct mbuf *init, int init_offset,
3826     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3827 {
3828         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3829         struct sctp_state_cookie *stc;
3830         struct sctp_paramhdr *ph;
3831         uint8_t *foo;
3832         int sig_offset;
3833         uint16_t cookie_sz;
3834
3835         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3836             sizeof(struct sctp_paramhdr)), 0,
3837             M_NOWAIT, 1, MT_DATA);
3838         if (mret == NULL) {
3839                 return (NULL);
3840         }
3841         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3842         if (copy_init == NULL) {
3843                 sctp_m_freem(mret);
3844                 return (NULL);
3845         }
3846 #ifdef SCTP_MBUF_LOGGING
3847         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3848                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3849         }
3850 #endif
3851         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3852             M_NOWAIT);
3853         if (copy_initack == NULL) {
3854                 sctp_m_freem(mret);
3855                 sctp_m_freem(copy_init);
3856                 return (NULL);
3857         }
3858 #ifdef SCTP_MBUF_LOGGING
3859         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3860                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3861         }
3862 #endif
3863         /* easy side we just drop it on the end */
3864         ph = mtod(mret, struct sctp_paramhdr *);
3865         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3866             sizeof(struct sctp_paramhdr);
3867         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3868             sizeof(struct sctp_paramhdr));
3869         ph->param_type = htons(SCTP_STATE_COOKIE);
3870         ph->param_length = 0;   /* fill in at the end */
3871         /* Fill in the stc cookie data */
3872         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3873
3874         /* tack the INIT and then the INIT-ACK onto the chain */
3875         cookie_sz = 0;
3876         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3877                 cookie_sz += SCTP_BUF_LEN(m_at);
3878                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3879                         SCTP_BUF_NEXT(m_at) = copy_init;
3880                         break;
3881                 }
3882         }
3883         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3884                 cookie_sz += SCTP_BUF_LEN(m_at);
3885                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3886                         SCTP_BUF_NEXT(m_at) = copy_initack;
3887                         break;
3888                 }
3889         }
3890         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3891                 cookie_sz += SCTP_BUF_LEN(m_at);
3892                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3893                         break;
3894                 }
3895         }
3896         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3897         if (sig == NULL) {
3898                 /* no space, so free the entire chain */
3899                 sctp_m_freem(mret);
3900                 return (NULL);
3901         }
3902         SCTP_BUF_LEN(sig) = 0;
3903         SCTP_BUF_NEXT(m_at) = sig;
3904         sig_offset = 0;
3905         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3906         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3907         *signature = foo;
3908         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3909         cookie_sz += SCTP_SIGNATURE_SIZE;
3910         ph->param_length = htons(cookie_sz);
3911         return (mret);
3912 }
3913
3914
3915 static uint8_t
3916 sctp_get_ect(struct sctp_tcb *stcb)
3917 {
3918         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3919                 return (SCTP_ECT0_BIT);
3920         } else {
3921                 return (0);
3922         }
3923 }
3924
3925 #if defined(INET) || defined(INET6)
3926 static void
3927 sctp_handle_no_route(struct sctp_tcb *stcb,
3928     struct sctp_nets *net,
3929     int so_locked)
3930 {
3931         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3932
3933         if (net) {
3934                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3935                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3936                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3937                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3938                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3939                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3940                                     stcb, 0,
3941                                     (void *)net,
3942                                     so_locked);
3943                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3944                                 net->dest_state &= ~SCTP_ADDR_PF;
3945                         }
3946                 }
3947                 if (stcb) {
3948                         if (net == stcb->asoc.primary_destination) {
3949                                 /* need a new primary */
3950                                 struct sctp_nets *alt;
3951
3952                                 alt = sctp_find_alternate_net(stcb, net, 0);
3953                                 if (alt != net) {
3954                                         if (stcb->asoc.alternate) {
3955                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3956                                         }
3957                                         stcb->asoc.alternate = alt;
3958                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3959                                         if (net->ro._s_addr) {
3960                                                 sctp_free_ifa(net->ro._s_addr);
3961                                                 net->ro._s_addr = NULL;
3962                                         }
3963                                         net->src_addr_selected = 0;
3964                                 }
3965                         }
3966                 }
3967         }
3968 }
3969 #endif
3970
3971 static int
3972 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3973     struct sctp_tcb *stcb,      /* may be NULL */
3974     struct sctp_nets *net,
3975     struct sockaddr *to,
3976     struct mbuf *m,
3977     uint32_t auth_offset,
3978     struct sctp_auth_chunk *auth,
3979     uint16_t auth_keyid,
3980     int nofragment_flag,
3981     int ecn_ok,
3982     int out_of_asoc_ok,
3983     uint16_t src_port,
3984     uint16_t dest_port,
3985     uint32_t v_tag,
3986     uint16_t port,
3987     union sctp_sockstore *over_addr,
3988     uint8_t mflowtype, uint32_t mflowid,
3989 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3990     int so_locked SCTP_UNUSED
3991 #else
3992     int so_locked
3993 #endif
3994 )
3995 {
3996 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3997         /**
3998          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3999          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4000          * - fill in the HMAC digest of any AUTH chunk in the packet.
4001          * - calculate and fill in the SCTP checksum.
4002          * - prepend an IP address header.
4003          * - if boundall use INADDR_ANY.
4004          * - if boundspecific do source address selection.
4005          * - set fragmentation option for ipV4.
4006          * - On return from IP output, check/adjust mtu size of output
4007          *   interface and smallest_mtu size as well.
4008          */
4009         /* Will need ifdefs around this */
4010         struct mbuf *newm;
4011         struct sctphdr *sctphdr;
4012         int packet_length;
4013         int ret;
4014 #if defined(INET) || defined(INET6)
4015         uint32_t vrf_id;
4016 #endif
4017 #if defined(INET) || defined(INET6)
4018         struct mbuf *o_pak;
4019         sctp_route_t *ro = NULL;
4020         struct udphdr *udp = NULL;
4021 #endif
4022         uint8_t tos_value;
4023 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4024         struct socket *so = NULL;
4025 #endif
4026
4027         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4028                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4029                 sctp_m_freem(m);
4030                 return (EFAULT);
4031         }
4032 #if defined(INET) || defined(INET6)
4033         if (stcb) {
4034                 vrf_id = stcb->asoc.vrf_id;
4035         } else {
4036                 vrf_id = inp->def_vrf_id;
4037         }
4038 #endif
4039         /* fill in the HMAC digest for any AUTH chunk in the packet */
4040         if ((auth != NULL) && (stcb != NULL)) {
4041                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4042         }
4043
4044         if (net) {
4045                 tos_value = net->dscp;
4046         } else if (stcb) {
4047                 tos_value = stcb->asoc.default_dscp;
4048         } else {
4049                 tos_value = inp->sctp_ep.default_dscp;
4050         }
4051
4052         switch (to->sa_family) {
4053 #ifdef INET
4054         case AF_INET:
4055                 {
4056                         struct ip *ip = NULL;
4057                         sctp_route_t iproute;
4058                         int len;
4059
4060                         len = SCTP_MIN_V4_OVERHEAD;
4061                         if (port) {
4062                                 len += sizeof(struct udphdr);
4063                         }
4064                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4065                         if (newm == NULL) {
4066                                 sctp_m_freem(m);
4067                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4068                                 return (ENOMEM);
4069                         }
4070                         SCTP_ALIGN_TO_END(newm, len);
4071                         SCTP_BUF_LEN(newm) = len;
4072                         SCTP_BUF_NEXT(newm) = m;
4073                         m = newm;
4074                         if (net != NULL) {
4075                                 m->m_pkthdr.flowid = net->flowid;
4076                                 M_HASHTYPE_SET(m, net->flowtype);
4077                         } else {
4078                                 m->m_pkthdr.flowid = mflowid;
4079                                 M_HASHTYPE_SET(m, mflowtype);
4080                         }
4081                         packet_length = sctp_calculate_len(m);
4082                         ip = mtod(m, struct ip *);
4083                         ip->ip_v = IPVERSION;
4084                         ip->ip_hl = (sizeof(struct ip) >> 2);
4085                         if (tos_value == 0) {
4086                                 /*
4087                                  * This means especially, that it is not set
4088                                  * at the SCTP layer. So use the value from
4089                                  * the IP layer.
4090                                  */
4091                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4092                         }
4093                         tos_value &= 0xfc;
4094                         if (ecn_ok) {
4095                                 tos_value |= sctp_get_ect(stcb);
4096                         }
4097                         if ((nofragment_flag) && (port == 0)) {
4098                                 ip->ip_off = htons(IP_DF);
4099                         } else {
4100                                 ip->ip_off = htons(0);
4101                         }
4102                         /* FreeBSD has a function for ip_id's */
4103                         ip_fillid(ip);
4104
4105                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4106                         ip->ip_len = htons(packet_length);
4107                         ip->ip_tos = tos_value;
4108                         if (port) {
4109                                 ip->ip_p = IPPROTO_UDP;
4110                         } else {
4111                                 ip->ip_p = IPPROTO_SCTP;
4112                         }
4113                         ip->ip_sum = 0;
4114                         if (net == NULL) {
4115                                 ro = &iproute;
4116                                 memset(&iproute, 0, sizeof(iproute));
4117                                 memcpy(&ro->ro_dst, to, to->sa_len);
4118                         } else {
4119                                 ro = (sctp_route_t *)&net->ro;
4120                         }
4121                         /* Now the address selection part */
4122                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4123
4124                         /* call the routine to select the src address */
4125                         if (net && out_of_asoc_ok == 0) {
4126                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4127                                         sctp_free_ifa(net->ro._s_addr);
4128                                         net->ro._s_addr = NULL;
4129                                         net->src_addr_selected = 0;
4130                                         if (ro->ro_rt) {
4131                                                 RTFREE(ro->ro_rt);
4132                                                 ro->ro_rt = NULL;
4133                                         }
4134                                 }
4135                                 if (net->src_addr_selected == 0) {
4136                                         /* Cache the source address */
4137                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4138                                             ro, net, 0,
4139                                             vrf_id);
4140                                         net->src_addr_selected = 1;
4141                                 }
4142                                 if (net->ro._s_addr == NULL) {
4143                                         /* No route to host */
4144                                         net->src_addr_selected = 0;
4145                                         sctp_handle_no_route(stcb, net, so_locked);
4146                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4147                                         sctp_m_freem(m);
4148                                         return (EHOSTUNREACH);
4149                                 }
4150                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4151                         } else {
4152                                 if (over_addr == NULL) {
4153                                         struct sctp_ifa *_lsrc;
4154
4155                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4156                                             net,
4157                                             out_of_asoc_ok,
4158                                             vrf_id);
4159                                         if (_lsrc == NULL) {
4160                                                 sctp_handle_no_route(stcb, net, so_locked);
4161                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4162                                                 sctp_m_freem(m);
4163                                                 return (EHOSTUNREACH);
4164                                         }
4165                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4166                                         sctp_free_ifa(_lsrc);
4167                                 } else {
4168                                         ip->ip_src = over_addr->sin.sin_addr;
4169                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4170                                 }
4171                         }
4172                         if (port) {
4173                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4174                                         sctp_handle_no_route(stcb, net, so_locked);
4175                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4176                                         sctp_m_freem(m);
4177                                         return (EHOSTUNREACH);
4178                                 }
4179                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4180                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4181                                 udp->uh_dport = port;
4182                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4183                                 if (V_udp_cksum) {
4184                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4185                                 } else {
4186                                         udp->uh_sum = 0;
4187                                 }
4188                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4189                         } else {
4190                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4191                         }
4192
4193                         sctphdr->src_port = src_port;
4194                         sctphdr->dest_port = dest_port;
4195                         sctphdr->v_tag = v_tag;
4196                         sctphdr->checksum = 0;
4197
4198                         /*
4199                          * If source address selection fails and we find no
4200                          * route then the ip_output should fail as well with
4201                          * a NO_ROUTE_TO_HOST type error. We probably should
4202                          * catch that somewhere and abort the association
4203                          * right away (assuming this is an INIT being sent).
4204                          */
4205                         if (ro->ro_rt == NULL) {
4206                                 /*
4207                                  * src addr selection failed to find a route
4208                                  * (or valid source addr), so we can't get
4209                                  * there from here (yet)!
4210                                  */
4211                                 sctp_handle_no_route(stcb, net, so_locked);
4212                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4213                                 sctp_m_freem(m);
4214                                 return (EHOSTUNREACH);
4215                         }
4216                         if (ro != &iproute) {
4217                                 memcpy(&iproute, ro, sizeof(*ro));
4218                         }
4219                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4220                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4221                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4222                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4224                             (void *)ro->ro_rt);
4225
4226                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4227                                 /* failed to prepend data, give up */
4228                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4229                                 sctp_m_freem(m);
4230                                 return (ENOMEM);
4231                         }
4232                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4233                         if (port) {
4234                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4235                                 SCTP_STAT_INCR(sctps_sendswcrc);
4236                                 if (V_udp_cksum) {
4237                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4238                                 }
4239                         } else {
4240                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4241                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4242                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4243                         }
4244 #ifdef SCTP_PACKET_LOGGING
4245                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4246                                 sctp_packet_log(o_pak);
4247 #endif
4248                         /* send it out.  table id is taken from stcb */
4249 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4250                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4251                                 so = SCTP_INP_SO(inp);
4252                                 SCTP_SOCKET_UNLOCK(so, 0);
4253                         }
4254 #endif
4255                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4256                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4258                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4259                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4260                                 SCTP_TCB_UNLOCK(stcb);
4261                                 SCTP_SOCKET_LOCK(so, 0);
4262                                 SCTP_TCB_LOCK(stcb);
4263                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4264                         }
4265 #endif
4266                         if (port) {
4267                                 UDPSTAT_INC(udps_opackets);
4268                         }
4269                         SCTP_STAT_INCR(sctps_sendpackets);
4270                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4271                         if (ret)
4272                                 SCTP_STAT_INCR(sctps_senderrors);
4273
4274                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4275                         if (net == NULL) {
4276                                 /* free tempy routes */
4277                                 RO_RTFREE(ro);
4278                         } else {
4279                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4280                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4281                                         uint32_t mtu;
4282
4283                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4284                                         if (mtu > 0) {
4285                                                 if (net->port) {
4286                                                         mtu -= sizeof(struct udphdr);
4287                                                 }
4288                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4289                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4290                                                 }
4291                                                 net->mtu = mtu;
4292                                         }
4293                                 } else if (ro->ro_rt == NULL) {
4294                                         /* route was freed */
4295                                         if (net->ro._s_addr &&
4296                                             net->src_addr_selected) {
4297                                                 sctp_free_ifa(net->ro._s_addr);
4298                                                 net->ro._s_addr = NULL;
4299                                         }
4300                                         net->src_addr_selected = 0;
4301                                 }
4302                         }
4303                         return (ret);
4304                 }
4305 #endif
4306 #ifdef INET6
4307         case AF_INET6:
4308                 {
4309                         uint32_t flowlabel, flowinfo;
4310                         struct ip6_hdr *ip6h;
4311                         struct route_in6 ip6route;
4312                         struct ifnet *ifp;
4313                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4314                         int prev_scope = 0;
4315                         struct sockaddr_in6 lsa6_storage;
4316                         int error;
4317                         u_short prev_port = 0;
4318                         int len;
4319
4320                         if (net) {
4321                                 flowlabel = net->flowlabel;
4322                         } else if (stcb) {
4323                                 flowlabel = stcb->asoc.default_flowlabel;
4324                         } else {
4325                                 flowlabel = inp->sctp_ep.default_flowlabel;
4326                         }
4327                         if (flowlabel == 0) {
4328                                 /*
4329                                  * This means especially, that it is not set
4330                                  * at the SCTP layer. So use the value from
4331                                  * the IP layer.
4332                                  */
4333                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4334                         }
4335                         flowlabel &= 0x000fffff;
4336                         len = SCTP_MIN_OVERHEAD;
4337                         if (port) {
4338                                 len += sizeof(struct udphdr);
4339                         }
4340                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4341                         if (newm == NULL) {
4342                                 sctp_m_freem(m);
4343                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4344                                 return (ENOMEM);
4345                         }
4346                         SCTP_ALIGN_TO_END(newm, len);
4347                         SCTP_BUF_LEN(newm) = len;
4348                         SCTP_BUF_NEXT(newm) = m;
4349                         m = newm;
4350                         if (net != NULL) {
4351                                 m->m_pkthdr.flowid = net->flowid;
4352                                 M_HASHTYPE_SET(m, net->flowtype);
4353                         } else {
4354                                 m->m_pkthdr.flowid = mflowid;
4355                                 M_HASHTYPE_SET(m, mflowtype);
4356                         }
4357                         packet_length = sctp_calculate_len(m);
4358
4359                         ip6h = mtod(m, struct ip6_hdr *);
4360                         /* protect *sin6 from overwrite */
4361                         sin6 = (struct sockaddr_in6 *)to;
4362                         tmp = *sin6;
4363                         sin6 = &tmp;
4364
4365                         /* KAME hack: embed scopeid */
4366                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4367                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4368                                 return (EINVAL);
4369                         }
4370                         if (net == NULL) {
4371                                 memset(&ip6route, 0, sizeof(ip6route));
4372                                 ro = (sctp_route_t *)&ip6route;
4373                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4374                         } else {
4375                                 ro = (sctp_route_t *)&net->ro;
4376                         }
4377                         /*
4378                          * We assume here that inp_flow is in host byte
4379                          * order within the TCB!
4380                          */
4381                         if (tos_value == 0) {
4382                                 /*
4383                                  * This means especially, that it is not set
4384                                  * at the SCTP layer. So use the value from
4385                                  * the IP layer.
4386                                  */
4387                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4388                         }
4389                         tos_value &= 0xfc;
4390                         if (ecn_ok) {
4391                                 tos_value |= sctp_get_ect(stcb);
4392                         }
4393                         flowinfo = 0x06;
4394                         flowinfo <<= 8;
4395                         flowinfo |= tos_value;
4396                         flowinfo <<= 20;
4397                         flowinfo |= flowlabel;
4398                         ip6h->ip6_flow = htonl(flowinfo);
4399                         if (port) {
4400                                 ip6h->ip6_nxt = IPPROTO_UDP;
4401                         } else {
4402                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4403                         }
4404                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4405                         ip6h->ip6_dst = sin6->sin6_addr;
4406
4407                         /*
4408                          * Add SRC address selection here: we can only reuse
4409                          * to a limited degree the kame src-addr-sel, since
4410                          * we can try their selection but it may not be
4411                          * bound.
4412                          */
4413                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4414                         lsa6_tmp.sin6_family = AF_INET6;
4415                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4416                         lsa6 = &lsa6_tmp;
4417                         if (net && out_of_asoc_ok == 0) {
4418                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4419                                         sctp_free_ifa(net->ro._s_addr);
4420                                         net->ro._s_addr = NULL;
4421                                         net->src_addr_selected = 0;
4422                                         if (ro->ro_rt) {
4423                                                 RTFREE(ro->ro_rt);
4424                                                 ro->ro_rt = NULL;
4425                                         }
4426                                 }
4427                                 if (net->src_addr_selected == 0) {
4428                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4429                                         /* KAME hack: embed scopeid */
4430                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4431                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4432                                                 return (EINVAL);
4433                                         }
4434                                         /* Cache the source address */
4435                                         net->ro._s_addr = sctp_source_address_selection(inp,
4436                                             stcb,
4437                                             ro,
4438                                             net,
4439                                             0,
4440                                             vrf_id);
4441                                         (void)sa6_recoverscope(sin6);
4442                                         net->src_addr_selected = 1;
4443                                 }
4444                                 if (net->ro._s_addr == NULL) {
4445                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4446                                         net->src_addr_selected = 0;
4447                                         sctp_handle_no_route(stcb, net, so_locked);
4448                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4449                                         sctp_m_freem(m);
4450                                         return (EHOSTUNREACH);
4451                                 }
4452                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4453                         } else {
4454                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4455                                 /* KAME hack: embed scopeid */
4456                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4457                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4458                                         return (EINVAL);
4459                                 }
4460                                 if (over_addr == NULL) {
4461                                         struct sctp_ifa *_lsrc;
4462
4463                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4464                                             net,
4465                                             out_of_asoc_ok,
4466                                             vrf_id);
4467                                         if (_lsrc == NULL) {
4468                                                 sctp_handle_no_route(stcb, net, so_locked);
4469                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4470                                                 sctp_m_freem(m);
4471                                                 return (EHOSTUNREACH);
4472                                         }
4473                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4474                                         sctp_free_ifa(_lsrc);
4475                                 } else {
4476                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4477                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4478                                 }
4479                                 (void)sa6_recoverscope(sin6);
4480                         }
4481                         lsa6->sin6_port = inp->sctp_lport;
4482
4483                         if (ro->ro_rt == NULL) {
4484                                 /*
4485                                  * src addr selection failed to find a route
4486                                  * (or valid source addr), so we can't get
4487                                  * there from here!
4488                                  */
4489                                 sctp_handle_no_route(stcb, net, so_locked);
4490                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4491                                 sctp_m_freem(m);
4492                                 return (EHOSTUNREACH);
4493                         }
4494                         /*
4495                          * XXX: sa6 may not have a valid sin6_scope_id in
4496                          * the non-SCOPEDROUTING case.
4497                          */
4498                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4499                         lsa6_storage.sin6_family = AF_INET6;
4500                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4501                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4502                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4503                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4504                                 sctp_m_freem(m);
4505                                 return (error);
4506                         }
4507                         /* XXX */
4508                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4509                         lsa6_storage.sin6_port = inp->sctp_lport;
4510                         lsa6 = &lsa6_storage;
4511                         ip6h->ip6_src = lsa6->sin6_addr;
4512
4513                         if (port) {
4514                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4515                                         sctp_handle_no_route(stcb, net, so_locked);
4516                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4517                                         sctp_m_freem(m);
4518                                         return (EHOSTUNREACH);
4519                                 }
4520                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4521                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4522                                 udp->uh_dport = port;
4523                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4524                                 udp->uh_sum = 0;
4525                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4526                         } else {
4527                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4528                         }
4529
4530                         sctphdr->src_port = src_port;
4531                         sctphdr->dest_port = dest_port;
4532                         sctphdr->v_tag = v_tag;
4533                         sctphdr->checksum = 0;
4534
4535                         /*
4536                          * We set the hop limit now since there is a good
4537                          * chance that our ro pointer is now filled
4538                          */
4539                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4540                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4541
4542 #ifdef SCTP_DEBUG
4543                         /* Copy to be sure something bad is not happening */
4544                         sin6->sin6_addr = ip6h->ip6_dst;
4545                         lsa6->sin6_addr = ip6h->ip6_src;
4546 #endif
4547
4548                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4549                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4550                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4551                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4552                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4553                         if (net) {
4554                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4555                                 /*
4556                                  * preserve the port and scope for link
4557                                  * local send
4558                                  */
4559                                 prev_scope = sin6->sin6_scope_id;
4560                                 prev_port = sin6->sin6_port;
4561                         }
4562
4563                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4564                                 /* failed to prepend data, give up */
4565                                 sctp_m_freem(m);
4566                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4567                                 return (ENOMEM);
4568                         }
4569                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4570                         if (port) {
4571                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4572                                 SCTP_STAT_INCR(sctps_sendswcrc);
4573                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4574                                         udp->uh_sum = 0xffff;
4575                                 }
4576                         } else {
4577                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4578                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4579                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4580                         }
4581                         /* send it out. table id is taken from stcb */
4582 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4583                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4584                                 so = SCTP_INP_SO(inp);
4585                                 SCTP_SOCKET_UNLOCK(so, 0);
4586                         }
4587 #endif
4588 #ifdef SCTP_PACKET_LOGGING
4589                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4590                                 sctp_packet_log(o_pak);
4591 #endif
4592                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4593                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4595                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4596                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4597                                 SCTP_TCB_UNLOCK(stcb);
4598                                 SCTP_SOCKET_LOCK(so, 0);
4599                                 SCTP_TCB_LOCK(stcb);
4600                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4601                         }
4602 #endif
4603                         if (net) {
4604                                 /* for link local this must be done */
4605                                 sin6->sin6_scope_id = prev_scope;
4606                                 sin6->sin6_port = prev_port;
4607                         }
4608                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4609                         if (port) {
4610                                 UDPSTAT_INC(udps_opackets);
4611                         }
4612                         SCTP_STAT_INCR(sctps_sendpackets);
4613                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4614                         if (ret) {
4615                                 SCTP_STAT_INCR(sctps_senderrors);
4616                         }
4617                         if (net == NULL) {
4618                                 /* Now if we had a temp route free it */
4619                                 RO_RTFREE(ro);
4620                         } else {
4621                                 /*
4622                                  * PMTU check versus smallest asoc MTU goes
4623                                  * here
4624                                  */
4625                                 if (ro->ro_rt == NULL) {
4626                                         /* Route was freed */
4627                                         if (net->ro._s_addr &&
4628                                             net->src_addr_selected) {
4629                                                 sctp_free_ifa(net->ro._s_addr);
4630                                                 net->ro._s_addr = NULL;
4631                                         }
4632                                         net->src_addr_selected = 0;
4633                                 }
4634                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4635                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4636                                         uint32_t mtu;
4637
4638                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4639                                         if (mtu > 0) {
4640                                                 if (net->port) {
4641                                                         mtu -= sizeof(struct udphdr);
4642                                                 }
4643                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4644                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4645                                                 }
4646                                                 net->mtu = mtu;
4647                                         }
4648                                 } else if (ifp) {
4649                                         if (ND_IFINFO(ifp)->linkmtu &&
4650                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4651                                                 sctp_mtu_size_reset(inp,
4652                                                     &stcb->asoc,
4653                                                     ND_IFINFO(ifp)->linkmtu);
4654                                         }
4655                                 }
4656                         }
4657                         return (ret);
4658                 }
4659 #endif
4660         default:
4661                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4662                     ((struct sockaddr *)to)->sa_family);
4663                 sctp_m_freem(m);
4664                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4665                 return (EFAULT);
4666         }
4667 }
4668
4669
4670 void
4671 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4672 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4673     SCTP_UNUSED
4674 #endif
4675 )
4676 {
4677         struct mbuf *m, *m_last;
4678         struct sctp_nets *net;
4679         struct sctp_init_chunk *init;
4680         struct sctp_supported_addr_param *sup_addr;
4681         struct sctp_adaptation_layer_indication *ali;
4682         struct sctp_supported_chunk_types_param *pr_supported;
4683         struct sctp_paramhdr *ph;
4684         int cnt_inits_to = 0;
4685         int error;
4686         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4687
4688         /* INIT's always go to the primary (and usually ONLY address) */
4689         net = stcb->asoc.primary_destination;
4690         if (net == NULL) {
4691                 net = TAILQ_FIRST(&stcb->asoc.nets);
4692                 if (net == NULL) {
4693                         /* TSNH */
4694                         return;
4695                 }
4696                 /* we confirm any address we send an INIT to */
4697                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4698                 (void)sctp_set_primary_addr(stcb, NULL, net);
4699         } else {
4700                 /* we confirm any address we send an INIT to */
4701                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4702         }
4703         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4704 #ifdef INET6
4705         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4706                 /*
4707                  * special hook, if we are sending to link local it will not
4708                  * show up in our private address count.
4709                  */
4710                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4711                         cnt_inits_to = 1;
4712         }
4713 #endif
4714         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4715                 /* This case should not happen */
4716                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4717                 return;
4718         }
4719         /* start the INIT timer */
4720         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4721
4722         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4723         if (m == NULL) {
4724                 /* No memory, INIT timer will re-attempt. */
4725                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4726                 return;
4727         }
4728         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4729         padding_len = 0;
4730         /* Now lets put the chunk header in place */
4731         init = mtod(m, struct sctp_init_chunk *);
4732         /* now the chunk header */
4733         init->ch.chunk_type = SCTP_INITIATION;
4734         init->ch.chunk_flags = 0;
4735         /* fill in later from mbuf we build */
4736         init->ch.chunk_length = 0;
4737         /* place in my tag */
4738         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4739         /* set up some of the credits. */
4740         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4741             SCTP_MINIMAL_RWND));
4742         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4743         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4744         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4745
4746         /* Adaptation layer indication parameter */
4747         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4748                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4749                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4750                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4751                 ali->ph.param_length = htons(parameter_len);
4752                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4753                 chunk_len += parameter_len;
4754         }
4755
4756         /* ECN parameter */
4757         if (stcb->asoc.ecn_supported == 1) {
4758                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4759                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4760                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4761                 ph->param_length = htons(parameter_len);
4762                 chunk_len += parameter_len;
4763         }
4764
4765         /* PR-SCTP supported parameter */
4766         if (stcb->asoc.prsctp_supported == 1) {
4767                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4768                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4769                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4770                 ph->param_length = htons(parameter_len);
4771                 chunk_len += parameter_len;
4772         }
4773
4774         /* Add NAT friendly parameter. */
4775         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4776                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4777                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4778                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4779                 ph->param_length = htons(parameter_len);
4780                 chunk_len += parameter_len;
4781         }
4782
4783         /* And now tell the peer which extensions we support */
4784         num_ext = 0;
4785         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4786         if (stcb->asoc.prsctp_supported == 1) {
4787                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4788                 if (stcb->asoc.idata_supported) {
4789                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4790                 }
4791         }
4792         if (stcb->asoc.auth_supported == 1) {
4793                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4794         }
4795         if (stcb->asoc.asconf_supported == 1) {
4796                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4797                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4798         }
4799         if (stcb->asoc.reconfig_supported == 1) {
4800                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4801         }
4802         if (stcb->asoc.idata_supported) {
4803                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4804         }
4805         if (stcb->asoc.nrsack_supported == 1) {
4806                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4807         }
4808         if (stcb->asoc.pktdrop_supported == 1) {
4809                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4810         }
4811         if (num_ext > 0) {
4812                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4813                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4814                 pr_supported->ph.param_length = htons(parameter_len);
4815                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4816                 chunk_len += parameter_len;
4817         }
4818         /* add authentication parameters */
4819         if (stcb->asoc.auth_supported) {
4820                 /* attach RANDOM parameter, if available */
4821                 if (stcb->asoc.authinfo.random != NULL) {
4822                         struct sctp_auth_random *randp;
4823
4824                         if (padding_len > 0) {
4825                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4826                                 chunk_len += padding_len;
4827                                 padding_len = 0;
4828                         }
4829                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4830                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4831                         /* random key already contains the header */
4832                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4833                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4834                         chunk_len += parameter_len;
4835                 }
4836                 /* add HMAC_ALGO parameter */
4837                 if (stcb->asoc.local_hmacs != NULL) {
4838                         struct sctp_auth_hmac_algo *hmacs;
4839
4840                         if (padding_len > 0) {
4841                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4842                                 chunk_len += padding_len;
4843                                 padding_len = 0;
4844                         }
4845                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4846                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4847                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4848                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4849                         hmacs->ph.param_length = htons(parameter_len);
4850                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4851                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4852                         chunk_len += parameter_len;
4853                 }
4854                 /* add CHUNKS parameter */
4855                 if (stcb->asoc.local_auth_chunks != NULL) {
4856                         struct sctp_auth_chunk_list *chunks;
4857
4858                         if (padding_len > 0) {
4859                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4860                                 chunk_len += padding_len;
4861                                 padding_len = 0;
4862                         }
4863                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4864                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4865                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4866                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4867                         chunks->ph.param_length = htons(parameter_len);
4868                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4869                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4870                         chunk_len += parameter_len;
4871                 }
4872         }
4873
4874         /* now any cookie time extensions */
4875         if (stcb->asoc.cookie_preserve_req) {
4876                 struct sctp_cookie_perserve_param *cookie_preserve;
4877
4878                 if (padding_len > 0) {
4879                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4880                         chunk_len += padding_len;
4881                         padding_len = 0;
4882                 }
4883                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4884                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4885                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4886                 cookie_preserve->ph.param_length = htons(parameter_len);
4887                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4888                 stcb->asoc.cookie_preserve_req = 0;
4889                 chunk_len += parameter_len;
4890         }
4891
4892         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4893                 uint8_t i;
4894
4895                 if (padding_len > 0) {
4896                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4897                         chunk_len += padding_len;
4898                         padding_len = 0;
4899                 }
4900                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4901                 if (stcb->asoc.scope.ipv4_addr_legal) {
4902                         parameter_len += (uint16_t)sizeof(uint16_t);
4903                 }
4904                 if (stcb->asoc.scope.ipv6_addr_legal) {
4905                         parameter_len += (uint16_t)sizeof(uint16_t);
4906                 }
4907                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4908                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4909                 sup_addr->ph.param_length = htons(parameter_len);
4910                 i = 0;
4911                 if (stcb->asoc.scope.ipv4_addr_legal) {
4912                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4913                 }
4914                 if (stcb->asoc.scope.ipv6_addr_legal) {
4915                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4916                 }
4917                 padding_len = 4 - 2 * i;
4918                 chunk_len += parameter_len;
4919         }
4920
4921         SCTP_BUF_LEN(m) = chunk_len;
4922         /* now the addresses */
4923         /*
4924          * To optimize this we could put the scoping stuff into a structure
4925          * and remove the individual uint8's from the assoc structure. Then
4926          * we could just sifa in the address within the stcb. But for now
4927          * this is a quick hack to get the address stuff teased apart.
4928          */
4929         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4930             m, cnt_inits_to,
4931             &padding_len, &chunk_len);
4932
4933         init->ch.chunk_length = htons(chunk_len);
4934         if (padding_len > 0) {
4935                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4936                         sctp_m_freem(m);
4937                         return;
4938                 }
4939         }
4940         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4941         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4942             (struct sockaddr *)&net->ro._l_addr,
4943             m, 0, NULL, 0, 0, 0, 0,
4944             inp->sctp_lport, stcb->rport, htonl(0),
4945             net->port, NULL,
4946             0, 0,
4947             so_locked))) {
4948                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4949                 if (error == ENOBUFS) {
4950                         stcb->asoc.ifp_had_enobuf = 1;
4951                         SCTP_STAT_INCR(sctps_lowlevelerr);
4952                 }
4953         } else {
4954                 stcb->asoc.ifp_had_enobuf = 0;
4955         }
4956         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4957         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4958 }
4959
4960 struct mbuf *
4961 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4962     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4963 {
4964         /*
4965          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4966          * being equal to the beginning of the params i.e. (iphlen +
4967          * sizeof(struct sctp_init_msg) parse through the parameters to the
4968          * end of the mbuf verifying that all parameters are known.
4969          *
4970          * For unknown parameters build and return a mbuf with
4971          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4972          * processing this chunk stop, and set *abort_processing to 1.
4973          *
4974          * By having param_offset be pre-set to where parameters begin it is
4975          * hoped that this routine may be reused in the future by new
4976          * features.
4977          */
4978         struct sctp_paramhdr *phdr, params;
4979
4980         struct mbuf *mat, *op_err;
4981         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4982         int at, limit, pad_needed;
4983         uint16_t ptype, plen, padded_size;
4984         int err_at;
4985
4986         *abort_processing = 0;
4987         mat = in_initpkt;
4988         err_at = 0;
4989         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4990         at = param_offset;
4991         op_err = NULL;
4992         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4993         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4994         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4995                 ptype = ntohs(phdr->param_type);
4996                 plen = ntohs(phdr->param_length);
4997                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4998                         /* wacked parameter */
4999                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5000                         goto invalid_size;
5001                 }
5002                 limit -= SCTP_SIZE32(plen);
5003                 /*-
5004                  * All parameters for all chunks that we know/understand are
5005                  * listed here. We process them other places and make
5006                  * appropriate stop actions per the upper bits. However this
5007                  * is the generic routine processor's can call to get back
5008                  * an operr.. to either incorporate (init-ack) or send.
5009                  */
5010                 padded_size = SCTP_SIZE32(plen);
5011                 switch (ptype) {
5012                         /* Param's with variable size */
5013                 case SCTP_HEARTBEAT_INFO:
5014                 case SCTP_STATE_COOKIE:
5015                 case SCTP_UNRECOG_PARAM:
5016                 case SCTP_ERROR_CAUSE_IND:
5017                         /* ok skip fwd */
5018                         at += padded_size;
5019                         break;
5020                         /* Param's with variable size within a range */
5021                 case SCTP_CHUNK_LIST:
5022                 case SCTP_SUPPORTED_CHUNK_EXT:
5023                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5024                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5025                                 goto invalid_size;
5026                         }
5027                         at += padded_size;
5028                         break;
5029                 case SCTP_SUPPORTED_ADDRTYPE:
5030                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5031                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5032                                 goto invalid_size;
5033                         }
5034                         at += padded_size;
5035                         break;
5036                 case SCTP_RANDOM:
5037                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5038                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5039                                 goto invalid_size;
5040                         }
5041                         at += padded_size;
5042                         break;
5043                 case SCTP_SET_PRIM_ADDR:
5044                 case SCTP_DEL_IP_ADDRESS:
5045                 case SCTP_ADD_IP_ADDRESS:
5046                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5047                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5049                                 goto invalid_size;
5050                         }
5051                         at += padded_size;
5052                         break;
5053                         /* Param's with a fixed size */
5054                 case SCTP_IPV4_ADDRESS:
5055                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5056                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5057                                 goto invalid_size;
5058                         }
5059                         at += padded_size;
5060                         break;
5061                 case SCTP_IPV6_ADDRESS:
5062                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5063                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5064                                 goto invalid_size;
5065                         }
5066                         at += padded_size;
5067                         break;
5068                 case SCTP_COOKIE_PRESERVE:
5069                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5070                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5071                                 goto invalid_size;
5072                         }
5073                         at += padded_size;
5074                         break;
5075                 case SCTP_HAS_NAT_SUPPORT:
5076                         *nat_friendly = 1;
5077                         /* fall through */
5078                 case SCTP_PRSCTP_SUPPORTED:
5079                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5081                                 goto invalid_size;
5082                         }
5083                         at += padded_size;
5084                         break;
5085                 case SCTP_ECN_CAPABLE:
5086                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5087                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5088                                 goto invalid_size;
5089                         }
5090                         at += padded_size;
5091                         break;
5092                 case SCTP_ULP_ADAPTATION:
5093                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5094                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5095                                 goto invalid_size;
5096                         }
5097                         at += padded_size;
5098                         break;
5099                 case SCTP_SUCCESS_REPORT:
5100                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5101                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5102                                 goto invalid_size;
5103                         }
5104                         at += padded_size;
5105                         break;
5106                 case SCTP_HOSTNAME_ADDRESS:
5107                         {
5108                                 /* We can NOT handle HOST NAME addresses!! */
5109                                 int l_len;
5110
5111                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5112                                 *abort_processing = 1;
5113                                 if (op_err == NULL) {
5114                                         /* Ok need to try to get a mbuf */
5115 #ifdef INET6
5116                                         l_len = SCTP_MIN_OVERHEAD;
5117 #else
5118                                         l_len = SCTP_MIN_V4_OVERHEAD;
5119 #endif
5120                                         l_len += sizeof(struct sctp_chunkhdr);
5121                                         l_len += plen;
5122                                         l_len += sizeof(struct sctp_paramhdr);
5123                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5124                                         if (op_err) {
5125                                                 SCTP_BUF_LEN(op_err) = 0;
5126                                                 /*
5127                                                  * pre-reserve space for ip
5128                                                  * and sctp header  and
5129                                                  * chunk hdr
5130                                                  */
5131 #ifdef INET6
5132                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5133 #else
5134                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5135 #endif
5136                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5137                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5138                                         }
5139                                 }
5140                                 if (op_err) {
5141                                         /* If we have space */
5142                                         struct sctp_paramhdr s;
5143
5144                                         if (err_at % 4) {
5145                                                 uint32_t cpthis = 0;
5146
5147                                                 pad_needed = 4 - (err_at % 4);
5148                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5149                                                 err_at += pad_needed;
5150                                         }
5151                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5152                                         s.param_length = htons(sizeof(s) + plen);
5153                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5154                                         err_at += sizeof(s);
5155                                         if (plen > sizeof(tempbuf)) {
5156                                                 plen = sizeof(tempbuf);
5157                                         }
5158                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5159                                         if (phdr == NULL) {
5160                                                 sctp_m_freem(op_err);
5161                                                 /*
5162                                                  * we are out of memory but
5163                                                  * we still need to have a
5164                                                  * look at what to do (the
5165                                                  * system is in trouble
5166                                                  * though).
5167                                                  */
5168                                                 return (NULL);
5169                                         }
5170                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5171                                 }
5172                                 return (op_err);
5173                                 break;
5174                         }
5175                 default:
5176                         /*
5177                          * we do not recognize the parameter figure out what
5178                          * we do.
5179                          */
5180                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5181                         if ((ptype & 0x4000) == 0x4000) {
5182                                 /* Report bit is set?? */
5183                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5184                                 if (op_err == NULL) {
5185                                         int l_len;
5186
5187                                         /* Ok need to try to get an mbuf */
5188 #ifdef INET6
5189                                         l_len = SCTP_MIN_OVERHEAD;
5190 #else
5191                                         l_len = SCTP_MIN_V4_OVERHEAD;
5192 #endif
5193                                         l_len += sizeof(struct sctp_chunkhdr);
5194                                         l_len += plen;
5195                                         l_len += sizeof(struct sctp_paramhdr);
5196                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5197                                         if (op_err) {
5198                                                 SCTP_BUF_LEN(op_err) = 0;
5199 #ifdef INET6
5200                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5201 #else
5202                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5203 #endif
5204                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5205                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5206                                         }
5207                                 }
5208                                 if (op_err) {
5209                                         /* If we have space */
5210                                         struct sctp_paramhdr s;
5211
5212                                         if (err_at % 4) {
5213                                                 uint32_t cpthis = 0;
5214
5215                                                 pad_needed = 4 - (err_at % 4);
5216                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5217                                                 err_at += pad_needed;
5218                                         }
5219                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5220                                         s.param_length = htons(sizeof(s) + plen);
5221                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5222                                         err_at += sizeof(s);
5223                                         if (plen > sizeof(tempbuf)) {
5224                                                 plen = sizeof(tempbuf);
5225                                         }
5226                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5227                                         if (phdr == NULL) {
5228                                                 sctp_m_freem(op_err);
5229                                                 /*
5230                                                  * we are out of memory but
5231                                                  * we still need to have a
5232                                                  * look at what to do (the
5233                                                  * system is in trouble
5234                                                  * though).
5235                                                  */
5236                                                 op_err = NULL;
5237                                                 goto more_processing;
5238                                         }
5239                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5240                                         err_at += plen;
5241                                 }
5242                         }
5243         more_processing:
5244                         if ((ptype & 0x8000) == 0x0000) {
5245                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5246                                 return (op_err);
5247                         } else {
5248                                 /* skip this chunk and continue processing */
5249                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5250                                 at += SCTP_SIZE32(plen);
5251                         }
5252                         break;
5253
5254                 }
5255                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5256         }
5257         return (op_err);
5258 invalid_size:
5259         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5260         *abort_processing = 1;
5261         if ((op_err == NULL) && phdr) {
5262                 int l_len;
5263 #ifdef INET6
5264                 l_len = SCTP_MIN_OVERHEAD;
5265 #else
5266                 l_len = SCTP_MIN_V4_OVERHEAD;
5267 #endif
5268                 l_len += sizeof(struct sctp_chunkhdr);
5269                 l_len += (2 * sizeof(struct sctp_paramhdr));
5270                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5271                 if (op_err) {
5272                         SCTP_BUF_LEN(op_err) = 0;
5273 #ifdef INET6
5274                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5275 #else
5276                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5277 #endif
5278                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5279                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5280                 }
5281         }
5282         if ((op_err) && phdr) {
5283                 struct sctp_paramhdr s;
5284
5285                 if (err_at % 4) {
5286                         uint32_t cpthis = 0;
5287
5288                         pad_needed = 4 - (err_at % 4);
5289                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5290                         err_at += pad_needed;
5291                 }
5292                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5293                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5294                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5295                 err_at += sizeof(s);
5296                 /* Only copy back the p-hdr that caused the issue */
5297                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5298         }
5299         return (op_err);
5300 }
5301
5302 static int
5303 sctp_are_there_new_addresses(struct sctp_association *asoc,
5304     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5305 {
5306         /*
5307          * Given a INIT packet, look through the packet to verify that there
5308          * are NO new addresses. As we go through the parameters add reports
5309          * of any un-understood parameters that require an error.  Also we
5310          * must return (1) to drop the packet if we see a un-understood
5311          * parameter that tells us to drop the chunk.
5312          */
5313         struct sockaddr *sa_touse;
5314         struct sockaddr *sa;
5315         struct sctp_paramhdr *phdr, params;
5316         uint16_t ptype, plen;
5317         uint8_t fnd;
5318         struct sctp_nets *net;
5319         int check_src;
5320 #ifdef INET
5321         struct sockaddr_in sin4, *sa4;
5322 #endif
5323 #ifdef INET6
5324         struct sockaddr_in6 sin6, *sa6;
5325 #endif
5326
5327 #ifdef INET
5328         memset(&sin4, 0, sizeof(sin4));
5329         sin4.sin_family = AF_INET;
5330         sin4.sin_len = sizeof(sin4);
5331 #endif
5332 #ifdef INET6
5333         memset(&sin6, 0, sizeof(sin6));
5334         sin6.sin6_family = AF_INET6;
5335         sin6.sin6_len = sizeof(sin6);
5336 #endif
5337         /* First what about the src address of the pkt ? */
5338         check_src = 0;
5339         switch (src->sa_family) {
5340 #ifdef INET
5341         case AF_INET:
5342                 if (asoc->scope.ipv4_addr_legal) {
5343                         check_src = 1;
5344                 }
5345                 break;
5346 #endif
5347 #ifdef INET6
5348         case AF_INET6:
5349                 if (asoc->scope.ipv6_addr_legal) {
5350                         check_src = 1;
5351                 }
5352                 break;
5353 #endif
5354         default:
5355                 /* TSNH */
5356                 break;
5357         }
5358         if (check_src) {
5359                 fnd = 0;
5360                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5361                         sa = (struct sockaddr *)&net->ro._l_addr;
5362                         if (sa->sa_family == src->sa_family) {
5363 #ifdef INET
5364                                 if (sa->sa_family == AF_INET) {
5365                                         struct sockaddr_in *src4;
5366
5367                                         sa4 = (struct sockaddr_in *)sa;
5368                                         src4 = (struct sockaddr_in *)src;
5369                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5370                                                 fnd = 1;
5371                                                 break;
5372                                         }
5373                                 }
5374 #endif
5375 #ifdef INET6
5376                                 if (sa->sa_family == AF_INET6) {
5377                                         struct sockaddr_in6 *src6;
5378
5379                                         sa6 = (struct sockaddr_in6 *)sa;
5380                                         src6 = (struct sockaddr_in6 *)src;
5381                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5382                                                 fnd = 1;
5383                                                 break;
5384                                         }
5385                                 }
5386 #endif
5387                         }
5388                 }
5389                 if (fnd == 0) {
5390                         /* New address added! no need to look further. */
5391                         return (1);
5392                 }
5393         }
5394         /* Ok so far lets munge through the rest of the packet */
5395         offset += sizeof(struct sctp_init_chunk);
5396         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5397         while (phdr) {
5398                 sa_touse = NULL;
5399                 ptype = ntohs(phdr->param_type);
5400                 plen = ntohs(phdr->param_length);
5401                 switch (ptype) {
5402 #ifdef INET
5403                 case SCTP_IPV4_ADDRESS:
5404                         {
5405                                 struct sctp_ipv4addr_param *p4, p4_buf;
5406
5407                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5408                                         return (1);
5409                                 }
5410                                 phdr = sctp_get_next_param(in_initpkt, offset,
5411                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5412                                 if (phdr == NULL) {
5413                                         return (1);
5414                                 }
5415                                 if (asoc->scope.ipv4_addr_legal) {
5416                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5417                                         sin4.sin_addr.s_addr = p4->addr;
5418                                         sa_touse = (struct sockaddr *)&sin4;
5419                                 }
5420                                 break;
5421                         }
5422 #endif
5423 #ifdef INET6
5424                 case SCTP_IPV6_ADDRESS:
5425                         {
5426                                 struct sctp_ipv6addr_param *p6, p6_buf;
5427
5428                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5429                                         return (1);
5430                                 }
5431                                 phdr = sctp_get_next_param(in_initpkt, offset,
5432                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5433                                 if (phdr == NULL) {
5434                                         return (1);
5435                                 }
5436                                 if (asoc->scope.ipv6_addr_legal) {
5437                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5438                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5439                                             sizeof(p6->addr));
5440                                         sa_touse = (struct sockaddr *)&sin6;
5441                                 }
5442                                 break;
5443                         }
5444 #endif
5445                 default:
5446                         sa_touse = NULL;
5447                         break;
5448                 }
5449                 if (sa_touse) {
5450                         /* ok, sa_touse points to one to check */
5451                         fnd = 0;
5452                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5453                                 sa = (struct sockaddr *)&net->ro._l_addr;
5454                                 if (sa->sa_family != sa_touse->sa_family) {
5455                                         continue;
5456                                 }
5457 #ifdef INET
5458                                 if (sa->sa_family == AF_INET) {
5459                                         sa4 = (struct sockaddr_in *)sa;
5460                                         if (sa4->sin_addr.s_addr ==
5461                                             sin4.sin_addr.s_addr) {
5462                                                 fnd = 1;
5463                                                 break;
5464                                         }
5465                                 }
5466 #endif
5467 #ifdef INET6
5468                                 if (sa->sa_family == AF_INET6) {
5469                                         sa6 = (struct sockaddr_in6 *)sa;
5470                                         if (SCTP6_ARE_ADDR_EQUAL(
5471                                             sa6, &sin6)) {
5472                                                 fnd = 1;
5473                                                 break;
5474                                         }
5475                                 }
5476 #endif
5477                         }
5478                         if (!fnd) {
5479                                 /* New addr added! no need to look further */
5480                                 return (1);
5481                         }
5482                 }
5483                 offset += SCTP_SIZE32(plen);
5484                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5485         }
5486         return (0);
5487 }
5488
5489 /*
5490  * Given a MBUF chain that was sent into us containing an INIT. Build a
5491  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5492  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5493  * message (i.e. the struct sctp_init_msg).
5494  */
5495 void
5496 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5497     struct sctp_nets *src_net, struct mbuf *init_pkt,
5498     int iphlen, int offset,
5499     struct sockaddr *src, struct sockaddr *dst,
5500     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5501     uint8_t mflowtype, uint32_t mflowid,
5502     uint32_t vrf_id, uint16_t port)
5503 {
5504         struct sctp_association *asoc;
5505         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5506         struct sctp_init_ack_chunk *initack;
5507         struct sctp_adaptation_layer_indication *ali;
5508         struct sctp_supported_chunk_types_param *pr_supported;
5509         struct sctp_paramhdr *ph;
5510         union sctp_sockstore *over_addr;
5511         struct sctp_scoping scp;
5512         struct timeval now;
5513 #ifdef INET
5514         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5515         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5516         struct sockaddr_in *sin;
5517 #endif
5518 #ifdef INET6
5519         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5520         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5521         struct sockaddr_in6 *sin6;
5522 #endif
5523         struct sockaddr *to;
5524         struct sctp_state_cookie stc;
5525         struct sctp_nets *net = NULL;
5526         uint8_t *signature = NULL;
5527         int cnt_inits_to = 0;
5528         uint16_t his_limit, i_want;
5529         int abort_flag;
5530         int nat_friendly = 0;
5531         int error;
5532         struct socket *so;
5533         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5534
5535         if (stcb) {
5536                 asoc = &stcb->asoc;
5537         } else {
5538                 asoc = NULL;
5539         }
5540         if ((asoc != NULL) &&
5541             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5542                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5543                         /*
5544                          * new addresses, out of here in non-cookie-wait
5545                          * states
5546                          *
5547                          * Send an ABORT, without the new address error
5548                          * cause. This looks no different than if no
5549                          * listener was present.
5550                          */
5551                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5552                             "Address added");
5553                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5554                             mflowtype, mflowid, inp->fibnum,
5555                             vrf_id, port);
5556                         return;
5557                 }
5558                 if (src_net != NULL && (src_net->port != port)) {
5559                         /*
5560                          * change of remote encapsulation port, out of here
5561                          * in non-cookie-wait states
5562                          *
5563                          * Send an ABORT, without an specific error cause.
5564                          * This looks no different than if no listener was
5565                          * present.
5566                          */
5567                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5568                             "Remote encapsulation port changed");
5569                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5570                             mflowtype, mflowid, inp->fibnum,
5571                             vrf_id, port);
5572                         return;
5573                 }
5574         }
5575         abort_flag = 0;
5576         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5577             (offset + sizeof(struct sctp_init_chunk)),
5578             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5579         if (abort_flag) {
5580 do_a_abort:
5581                 if (op_err == NULL) {
5582                         char msg[SCTP_DIAG_INFO_LEN];
5583
5584                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5585                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5586                             msg);
5587                 }
5588                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5589                     init_chk->init.initiate_tag, op_err,
5590                     mflowtype, mflowid, inp->fibnum,
5591                     vrf_id, port);
5592                 return;
5593         }
5594         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5595         if (m == NULL) {
5596                 /* No memory, INIT timer will re-attempt. */
5597                 if (op_err)
5598                         sctp_m_freem(op_err);
5599                 return;
5600         }
5601         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5602         padding_len = 0;
5603
5604         /*
5605          * We might not overwrite the identification[] completely and on
5606          * some platforms time_entered will contain some padding. Therefore
5607          * zero out the cookie to avoid putting uninitialized memory on the
5608          * wire.
5609          */
5610         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5611
5612         /* the time I built cookie */
5613         (void)SCTP_GETTIME_TIMEVAL(&now);
5614         stc.time_entered.tv_sec = now.tv_sec;
5615         stc.time_entered.tv_usec = now.tv_usec;
5616
5617         /* populate any tie tags */
5618         if (asoc != NULL) {
5619                 /* unlock before tag selections */
5620                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5621                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5622                 stc.cookie_life = asoc->cookie_life;
5623                 net = asoc->primary_destination;
5624         } else {
5625                 stc.tie_tag_my_vtag = 0;
5626                 stc.tie_tag_peer_vtag = 0;
5627                 /* life I will award this cookie */
5628                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5629         }
5630
5631         /* copy in the ports for later check */
5632         stc.myport = sh->dest_port;
5633         stc.peerport = sh->src_port;
5634
5635         /*
5636          * If we wanted to honor cookie life extensions, we would add to
5637          * stc.cookie_life. For now we should NOT honor any extension
5638          */
5639         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5640         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5641                 stc.ipv6_addr_legal = 1;
5642                 if (SCTP_IPV6_V6ONLY(inp)) {
5643                         stc.ipv4_addr_legal = 0;
5644                 } else {
5645                         stc.ipv4_addr_legal = 1;
5646                 }
5647         } else {
5648                 stc.ipv6_addr_legal = 0;
5649                 stc.ipv4_addr_legal = 1;
5650         }
5651         stc.ipv4_scope = 0;
5652         if (net == NULL) {
5653                 to = src;
5654                 switch (dst->sa_family) {
5655 #ifdef INET
5656                 case AF_INET:
5657                         {
5658                                 /* lookup address */
5659                                 stc.address[0] = src4->sin_addr.s_addr;
5660                                 stc.address[1] = 0;
5661                                 stc.address[2] = 0;
5662                                 stc.address[3] = 0;
5663                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5664                                 /* local from address */
5665                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5666                                 stc.laddress[1] = 0;
5667                                 stc.laddress[2] = 0;
5668                                 stc.laddress[3] = 0;
5669                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5670                                 /* scope_id is only for v6 */
5671                                 stc.scope_id = 0;
5672                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5673                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5674                                         stc.ipv4_scope = 1;
5675                                 }
5676                                 /* Must use the address in this case */
5677                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5678                                         stc.loopback_scope = 1;
5679                                         stc.ipv4_scope = 1;
5680                                         stc.site_scope = 1;
5681                                         stc.local_scope = 0;
5682                                 }
5683                                 break;
5684                         }
5685 #endif
5686 #ifdef INET6
5687                 case AF_INET6:
5688                         {
5689                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5690                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5691                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5692                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5693                                         stc.loopback_scope = 1;
5694                                         stc.local_scope = 0;
5695                                         stc.site_scope = 1;
5696                                         stc.ipv4_scope = 1;
5697                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5698                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5699                                         /*
5700                                          * If the new destination or source
5701                                          * is a LINK_LOCAL we must have
5702                                          * common both site and local scope.
5703                                          * Don't set local scope though
5704                                          * since we must depend on the
5705                                          * source to be added implicitly. We
5706                                          * cannot assure just because we
5707                                          * share one link that all links are
5708                                          * common.
5709                                          */
5710                                         stc.local_scope = 0;
5711                                         stc.site_scope = 1;
5712                                         stc.ipv4_scope = 1;
5713                                         /*
5714                                          * we start counting for the private
5715                                          * address stuff at 1. since the
5716                                          * link local we source from won't
5717                                          * show up in our scoped count.
5718                                          */
5719                                         cnt_inits_to = 1;
5720                                         /*
5721                                          * pull out the scope_id from
5722                                          * incoming pkt
5723                                          */
5724                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5725                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5726                                         /*
5727                                          * If the new destination or source
5728                                          * is SITE_LOCAL then we must have
5729                                          * site scope in common.
5730                                          */
5731                                         stc.site_scope = 1;
5732                                 }
5733                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5734                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5735                                 break;
5736                         }
5737 #endif
5738                 default:
5739                         /* TSNH */
5740                         goto do_a_abort;
5741                         break;
5742                 }
5743         } else {
5744                 /* set the scope per the existing tcb */
5745
5746 #ifdef INET6
5747                 struct sctp_nets *lnet;
5748 #endif
5749
5750                 stc.loopback_scope = asoc->scope.loopback_scope;
5751                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5752                 stc.site_scope = asoc->scope.site_scope;
5753                 stc.local_scope = asoc->scope.local_scope;
5754 #ifdef INET6
5755                 /* Why do we not consider IPv4 LL addresses? */
5756                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5757                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5758                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5759                                         /*
5760                                          * if we have a LL address, start
5761                                          * counting at 1.
5762                                          */
5763                                         cnt_inits_to = 1;
5764                                 }
5765                         }
5766                 }
5767 #endif
5768                 /* use the net pointer */
5769                 to = (struct sockaddr *)&net->ro._l_addr;
5770                 switch (to->sa_family) {
5771 #ifdef INET
5772                 case AF_INET:
5773                         sin = (struct sockaddr_in *)to;
5774                         stc.address[0] = sin->sin_addr.s_addr;
5775                         stc.address[1] = 0;
5776                         stc.address[2] = 0;
5777                         stc.address[3] = 0;
5778                         stc.addr_type = SCTP_IPV4_ADDRESS;
5779                         if (net->src_addr_selected == 0) {
5780                                 /*
5781                                  * strange case here, the INIT should have
5782                                  * did the selection.
5783                                  */
5784                                 net->ro._s_addr = sctp_source_address_selection(inp,
5785                                     stcb, (sctp_route_t *)&net->ro,
5786                                     net, 0, vrf_id);
5787                                 if (net->ro._s_addr == NULL)
5788                                         return;
5789
5790                                 net->src_addr_selected = 1;
5791
5792                         }
5793                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5794                         stc.laddress[1] = 0;
5795                         stc.laddress[2] = 0;
5796                         stc.laddress[3] = 0;
5797                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5798                         /* scope_id is only for v6 */
5799                         stc.scope_id = 0;
5800                         break;
5801 #endif
5802 #ifdef INET6
5803                 case AF_INET6:
5804                         sin6 = (struct sockaddr_in6 *)to;
5805                         memcpy(&stc.address, &sin6->sin6_addr,
5806                             sizeof(struct in6_addr));
5807                         stc.addr_type = SCTP_IPV6_ADDRESS;
5808                         stc.scope_id = sin6->sin6_scope_id;
5809                         if (net->src_addr_selected == 0) {
5810                                 /*
5811                                  * strange case here, the INIT should have
5812                                  * done the selection.
5813                                  */
5814                                 net->ro._s_addr = sctp_source_address_selection(inp,
5815                                     stcb, (sctp_route_t *)&net->ro,
5816                                     net, 0, vrf_id);
5817                                 if (net->ro._s_addr == NULL)
5818                                         return;
5819
5820                                 net->src_addr_selected = 1;
5821                         }
5822                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5823                             sizeof(struct in6_addr));
5824                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5825                         break;
5826 #endif
5827                 }
5828         }
5829         /* Now lets put the SCTP header in place */
5830         initack = mtod(m, struct sctp_init_ack_chunk *);
5831         /* Save it off for quick ref */
5832         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5833         /* who are we */
5834         memcpy(stc.identification, SCTP_VERSION_STRING,
5835             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5836         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5837         /* now the chunk header */
5838         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5839         initack->ch.chunk_flags = 0;
5840         /* fill in later from mbuf we build */
5841         initack->ch.chunk_length = 0;
5842         /* place in my tag */
5843         if ((asoc != NULL) &&
5844             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5845             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5846             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5847                 /* re-use the v-tags and init-seq here */
5848                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5849                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5850         } else {
5851                 uint32_t vtag, itsn;
5852
5853                 if (asoc) {
5854                         atomic_add_int(&asoc->refcnt, 1);
5855                         SCTP_TCB_UNLOCK(stcb);
5856         new_tag:
5857                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5858                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5859                                 /*
5860                                  * Got a duplicate vtag on some guy behind a
5861                                  * nat make sure we don't use it.
5862                                  */
5863                                 goto new_tag;
5864                         }
5865                         initack->init.initiate_tag = htonl(vtag);
5866                         /* get a TSN to use too */
5867                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5868                         initack->init.initial_tsn = htonl(itsn);
5869                         SCTP_TCB_LOCK(stcb);
5870                         atomic_add_int(&asoc->refcnt, -1);
5871                 } else {
5872                         SCTP_INP_INCR_REF(inp);
5873                         SCTP_INP_RUNLOCK(inp);
5874                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5875                         initack->init.initiate_tag = htonl(vtag);
5876                         /* get a TSN to use too */
5877                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5878                         SCTP_INP_RLOCK(inp);
5879                         SCTP_INP_DECR_REF(inp);
5880                 }
5881         }
5882         /* save away my tag to */
5883         stc.my_vtag = initack->init.initiate_tag;
5884
5885         /* set up some of the credits. */
5886         so = inp->sctp_socket;
5887         if (so == NULL) {
5888                 /* memory problem */
5889                 sctp_m_freem(m);
5890                 return;
5891         } else {
5892                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5893         }
5894         /* set what I want */
5895         his_limit = ntohs(init_chk->init.num_inbound_streams);
5896         /* choose what I want */
5897         if (asoc != NULL) {
5898                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5899                         i_want = asoc->streamoutcnt;
5900                 } else {
5901                         i_want = asoc->pre_open_streams;
5902                 }
5903         } else {
5904                 i_want = inp->sctp_ep.pre_open_stream_count;
5905         }
5906         if (his_limit < i_want) {
5907                 /* I Want more :< */
5908                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5909         } else {
5910                 /* I can have what I want :> */
5911                 initack->init.num_outbound_streams = htons(i_want);
5912         }
5913         /* tell him his limit. */
5914         initack->init.num_inbound_streams =
5915             htons(inp->sctp_ep.max_open_streams_intome);
5916
5917         /* adaptation layer indication parameter */
5918         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5919                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5920                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5921                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5922                 ali->ph.param_length = htons(parameter_len);
5923                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5924                 chunk_len += parameter_len;
5925         }
5926
5927         /* ECN parameter */
5928         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5929             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5930                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5931                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5932                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5933                 ph->param_length = htons(parameter_len);
5934                 chunk_len += parameter_len;
5935         }
5936
5937         /* PR-SCTP supported parameter */
5938         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5939             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5940                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5941                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5942                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5943                 ph->param_length = htons(parameter_len);
5944                 chunk_len += parameter_len;
5945         }
5946
5947         /* Add NAT friendly parameter */
5948         if (nat_friendly) {
5949                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5950                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5951                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5952                 ph->param_length = htons(parameter_len);
5953                 chunk_len += parameter_len;
5954         }
5955
5956         /* And now tell the peer which extensions we support */
5957         num_ext = 0;
5958         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5959         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5960             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5962                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5963                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5964                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5965                 }
5966         }
5967         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5968             ((asoc == NULL) && (inp->auth_supported == 1))) {
5969                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5970         }
5971         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5972             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5973                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5974                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5975         }
5976         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5977             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5978                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5979         }
5980         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5981             ((asoc == NULL) && (inp->idata_supported == 1))) {
5982                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5983         }
5984         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5985             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5986                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5987         }
5988         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5989             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5990                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5991         }
5992         if (num_ext > 0) {
5993                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5994                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5995                 pr_supported->ph.param_length = htons(parameter_len);
5996                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5997                 chunk_len += parameter_len;
5998         }
5999
6000         /* add authentication parameters */
6001         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6002             ((asoc == NULL) && (inp->auth_supported == 1))) {
6003                 struct sctp_auth_random *randp;
6004                 struct sctp_auth_hmac_algo *hmacs;
6005                 struct sctp_auth_chunk_list *chunks;
6006
6007                 if (padding_len > 0) {
6008                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6009                         chunk_len += padding_len;
6010                         padding_len = 0;
6011                 }
6012                 /* generate and add RANDOM parameter */
6013                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6014                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6015                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6016                 randp->ph.param_type = htons(SCTP_RANDOM);
6017                 randp->ph.param_length = htons(parameter_len);
6018                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6019                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6020                 chunk_len += parameter_len;
6021
6022                 if (padding_len > 0) {
6023                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6024                         chunk_len += padding_len;
6025                         padding_len = 0;
6026                 }
6027                 /* add HMAC_ALGO parameter */
6028                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6029                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6030                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6031                     (uint8_t *)hmacs->hmac_ids);
6032                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6033                 hmacs->ph.param_length = htons(parameter_len);
6034                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6035                 chunk_len += parameter_len;
6036
6037                 if (padding_len > 0) {
6038                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6039                         chunk_len += padding_len;
6040                         padding_len = 0;
6041                 }
6042                 /* add CHUNKS parameter */
6043                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6044                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6045                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6046                     chunks->chunk_types);
6047                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6048                 chunks->ph.param_length = htons(parameter_len);
6049                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6050                 chunk_len += parameter_len;
6051         }
6052         SCTP_BUF_LEN(m) = chunk_len;
6053         m_last = m;
6054         /* now the addresses */
6055         /*
6056          * To optimize this we could put the scoping stuff into a structure
6057          * and remove the individual uint8's from the stc structure. Then we
6058          * could just sifa in the address within the stc.. but for now this
6059          * is a quick hack to get the address stuff teased apart.
6060          */
6061         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6062         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6063         scp.loopback_scope = stc.loopback_scope;
6064         scp.ipv4_local_scope = stc.ipv4_scope;
6065         scp.local_scope = stc.local_scope;
6066         scp.site_scope = stc.site_scope;
6067         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6068             cnt_inits_to,
6069             &padding_len, &chunk_len);
6070         /* padding_len can only be positive, if no addresses have been added */
6071         if (padding_len > 0) {
6072                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6073                 chunk_len += padding_len;
6074                 SCTP_BUF_LEN(m) += padding_len;
6075                 padding_len = 0;
6076         }
6077
6078         /* tack on the operational error if present */
6079         if (op_err) {
6080                 parameter_len = 0;
6081                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6082                         parameter_len += SCTP_BUF_LEN(m_tmp);
6083                 }
6084                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6085                 SCTP_BUF_NEXT(m_last) = op_err;
6086                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6087                         m_last = SCTP_BUF_NEXT(m_last);
6088                 }
6089                 chunk_len += parameter_len;
6090         }
6091         if (padding_len > 0) {
6092                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6093                 if (m_last == NULL) {
6094                         /* Houston we have a problem, no space */
6095                         sctp_m_freem(m);
6096                         return;
6097                 }
6098                 chunk_len += padding_len;
6099                 padding_len = 0;
6100         }
6101         /* Now we must build a cookie */
6102         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6103         if (m_cookie == NULL) {
6104                 /* memory problem */
6105                 sctp_m_freem(m);
6106                 return;
6107         }
6108         /* Now append the cookie to the end and update the space/size */
6109         SCTP_BUF_NEXT(m_last) = m_cookie;
6110         parameter_len = 0;
6111         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6112                 parameter_len += SCTP_BUF_LEN(m_tmp);
6113                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6114                         m_last = m_tmp;
6115                 }
6116         }
6117         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6118         chunk_len += parameter_len;
6119
6120         /*
6121          * Place in the size, but we don't include the last pad (if any) in
6122          * the INIT-ACK.
6123          */
6124         initack->ch.chunk_length = htons(chunk_len);
6125
6126         /*
6127          * Time to sign the cookie, we don't sign over the cookie signature
6128          * though thus we set trailer.
6129          */
6130         (void)sctp_hmac_m(SCTP_HMAC,
6131             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6132             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6133             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6134         /*
6135          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6136          * here since the timer will drive a retranmission.
6137          */
6138         if (padding_len > 0) {
6139                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6140                         sctp_m_freem(m);
6141                         return;
6142                 }
6143         }
6144         if (stc.loopback_scope) {
6145                 over_addr = (union sctp_sockstore *)dst;
6146         } else {
6147                 over_addr = NULL;
6148         }
6149
6150         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6151             0, 0,
6152             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6153             port, over_addr,
6154             mflowtype, mflowid,
6155             SCTP_SO_NOT_LOCKED))) {
6156                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6157                 if (error == ENOBUFS) {
6158                         if (asoc != NULL) {
6159                                 asoc->ifp_had_enobuf = 1;
6160                         }
6161                         SCTP_STAT_INCR(sctps_lowlevelerr);
6162                 }
6163         } else {
6164                 if (asoc != NULL) {
6165                         asoc->ifp_had_enobuf = 0;
6166                 }
6167         }
6168         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6169 }
6170
6171
6172 static void
6173 sctp_prune_prsctp(struct sctp_tcb *stcb,
6174     struct sctp_association *asoc,
6175     struct sctp_sndrcvinfo *srcv,
6176     int dataout)
6177 {
6178         int freed_spc = 0;
6179         struct sctp_tmit_chunk *chk, *nchk;
6180
6181         SCTP_TCB_LOCK_ASSERT(stcb);
6182         if ((asoc->prsctp_supported) &&
6183             (asoc->sent_queue_cnt_removeable > 0)) {
6184                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6185                         /*
6186                          * Look for chunks marked with the PR_SCTP flag AND
6187                          * the buffer space flag. If the one being sent is
6188                          * equal or greater priority then purge the old one
6189                          * and free some space.
6190                          */
6191                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6192                                 /*
6193                                  * This one is PR-SCTP AND buffer space
6194                                  * limited type
6195                                  */
6196                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6197                                         /*
6198                                          * Lower numbers equates to higher
6199                                          * priority so if the one we are
6200                                          * looking at has a larger or equal
6201                                          * priority we want to drop the data
6202                                          * and NOT retransmit it.
6203                                          */
6204                                         if (chk->data) {
6205                                                 /*
6206                                                  * We release the book_size
6207                                                  * if the mbuf is here
6208                                                  */
6209                                                 int ret_spc;
6210                                                 uint8_t sent;
6211
6212                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6213                                                         sent = 1;
6214                                                 else
6215                                                         sent = 0;
6216                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6217                                                     sent,
6218                                                     SCTP_SO_LOCKED);
6219                                                 freed_spc += ret_spc;
6220                                                 if (freed_spc >= dataout) {
6221                                                         return;
6222                                                 }
6223                                         }       /* if chunk was present */
6224                                 }       /* if of sufficient priority */
6225                         }       /* if chunk has enabled */
6226                 }               /* tailqforeach */
6227
6228                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6229                         /* Here we must move to the sent queue and mark */
6230                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6231                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6232                                         if (chk->data) {
6233                                                 /*
6234                                                  * We release the book_size
6235                                                  * if the mbuf is here
6236                                                  */
6237                                                 int ret_spc;
6238
6239                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6240                                                     0, SCTP_SO_LOCKED);
6241
6242                                                 freed_spc += ret_spc;
6243                                                 if (freed_spc >= dataout) {
6244                                                         return;
6245                                                 }
6246                                         }       /* end if chk->data */
6247                                 }       /* end if right class */
6248                         }       /* end if chk pr-sctp */
6249                 }               /* tailqforeachsafe (chk) */
6250         }                       /* if enabled in asoc */
6251 }
6252
6253 int
6254 sctp_get_frag_point(struct sctp_tcb *stcb,
6255     struct sctp_association *asoc)
6256 {
6257         int siz, ovh;
6258
6259         /*
6260          * For endpoints that have both v6 and v4 addresses we must reserve
6261          * room for the ipv6 header, for those that are only dealing with V4
6262          * we use a larger frag point.
6263          */
6264         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6265                 ovh = SCTP_MIN_OVERHEAD;
6266         } else {
6267                 ovh = SCTP_MIN_V4_OVERHEAD;
6268         }
6269         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6270         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6271                 siz = asoc->smallest_mtu - ovh;
6272         else
6273                 siz = (stcb->asoc.sctp_frag_point - ovh);
6274         /*
6275          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6276          */
6277         /* A data chunk MUST fit in a cluster */
6278         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6279         /* } */
6280
6281         /* adjust for an AUTH chunk if DATA requires auth */
6282         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6283                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6284
6285         if (siz % 4) {
6286                 /* make it an even word boundary please */
6287                 siz -= (siz % 4);
6288         }
6289         return (siz);
6290 }
6291
6292 static void
6293 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6294 {
6295         /*
6296          * We assume that the user wants PR_SCTP_TTL if the user provides a
6297          * positive lifetime but does not specify any PR_SCTP policy.
6298          */
6299         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6300                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6301         } else if (sp->timetolive > 0) {
6302                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6303                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6304         } else {
6305                 return;
6306         }
6307         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6308         case CHUNK_FLAGS_PR_SCTP_BUF:
6309                 /*
6310                  * Time to live is a priority stored in tv_sec when doing
6311                  * the buffer drop thing.
6312                  */
6313                 sp->ts.tv_sec = sp->timetolive;
6314                 sp->ts.tv_usec = 0;
6315                 break;
6316         case CHUNK_FLAGS_PR_SCTP_TTL:
6317                 {
6318                         struct timeval tv;
6319
6320                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6321                         tv.tv_sec = sp->timetolive / 1000;
6322                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6323                         /*
6324                          * TODO sctp_constants.h needs alternative time
6325                          * macros when _KERNEL is undefined.
6326                          */
6327                         timevaladd(&sp->ts, &tv);
6328                 }
6329                 break;
6330         case CHUNK_FLAGS_PR_SCTP_RTX:
6331                 /*
6332                  * Time to live is a the number or retransmissions stored in
6333                  * tv_sec.
6334                  */
6335                 sp->ts.tv_sec = sp->timetolive;
6336                 sp->ts.tv_usec = 0;
6337                 break;
6338         default:
6339                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6340                     "Unknown PR_SCTP policy %u.\n",
6341                     PR_SCTP_POLICY(sp->sinfo_flags));
6342                 break;
6343         }
6344 }
6345
6346 static int
6347 sctp_msg_append(struct sctp_tcb *stcb,
6348     struct sctp_nets *net,
6349     struct mbuf *m,
6350     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6351 {
6352         int error = 0;
6353         struct mbuf *at;
6354         struct sctp_stream_queue_pending *sp = NULL;
6355         struct sctp_stream_out *strm;
6356
6357         /*
6358          * Given an mbuf chain, put it into the association send queue and
6359          * place it on the wheel
6360          */
6361         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6362                 /* Invalid stream number */
6363                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6364                 error = EINVAL;
6365                 goto out_now;
6366         }
6367         if ((stcb->asoc.stream_locked) &&
6368             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6369                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6370                 error = EINVAL;
6371                 goto out_now;
6372         }
6373         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6374         /* Now can we send this? */
6375         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6376             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6377             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6378             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6379                 /* got data while shutting down */
6380                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6381                 error = ECONNRESET;
6382                 goto out_now;
6383         }
6384         sctp_alloc_a_strmoq(stcb, sp);
6385         if (sp == NULL) {
6386                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6387                 error = ENOMEM;
6388                 goto out_now;
6389         }
6390         sp->sinfo_flags = srcv->sinfo_flags;
6391         sp->timetolive = srcv->sinfo_timetolive;
6392         sp->ppid = srcv->sinfo_ppid;
6393         sp->context = srcv->sinfo_context;
6394         sp->fsn = 0;
6395         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6396                 sp->net = net;
6397                 atomic_add_int(&sp->net->ref_count, 1);
6398         } else {
6399                 sp->net = NULL;
6400         }
6401         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6402         sp->sid = srcv->sinfo_stream;
6403         sp->msg_is_complete = 1;
6404         sp->sender_all_done = 1;
6405         sp->some_taken = 0;
6406         sp->data = m;
6407         sp->tail_mbuf = NULL;
6408         sctp_set_prsctp_policy(sp);
6409         /*
6410          * We could in theory (for sendall) sifa the length in, but we would
6411          * still have to hunt through the chain since we need to setup the
6412          * tail_mbuf
6413          */
6414         sp->length = 0;
6415         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6416                 if (SCTP_BUF_NEXT(at) == NULL)
6417                         sp->tail_mbuf = at;
6418                 sp->length += SCTP_BUF_LEN(at);
6419         }
6420         if (srcv->sinfo_keynumber_valid) {
6421                 sp->auth_keyid = srcv->sinfo_keynumber;
6422         } else {
6423                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6424         }
6425         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6426                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6427                 sp->holds_key_ref = 1;
6428         }
6429         if (hold_stcb_lock == 0) {
6430                 SCTP_TCB_SEND_LOCK(stcb);
6431         }
6432         sctp_snd_sb_alloc(stcb, sp->length);
6433         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6434         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6435         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6436         m = NULL;
6437         if (hold_stcb_lock == 0) {
6438                 SCTP_TCB_SEND_UNLOCK(stcb);
6439         }
6440 out_now:
6441         if (m) {
6442                 sctp_m_freem(m);
6443         }
6444         return (error);
6445 }
6446
6447
6448 static struct mbuf *
6449 sctp_copy_mbufchain(struct mbuf *clonechain,
6450     struct mbuf *outchain,
6451     struct mbuf **endofchain,
6452     int can_take_mbuf,
6453     int sizeofcpy,
6454     uint8_t copy_by_ref)
6455 {
6456         struct mbuf *m;
6457         struct mbuf *appendchain;
6458         caddr_t cp;
6459         int len;
6460
6461         if (endofchain == NULL) {
6462                 /* error */
6463 error_out:
6464                 if (outchain)
6465                         sctp_m_freem(outchain);
6466                 return (NULL);
6467         }
6468         if (can_take_mbuf) {
6469                 appendchain = clonechain;
6470         } else {
6471                 if (!copy_by_ref &&
6472                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6473                     ) {
6474                         /* Its not in a cluster */
6475                         if (*endofchain == NULL) {
6476                                 /* lets get a mbuf cluster */
6477                                 if (outchain == NULL) {
6478                                         /* This is the general case */
6479                         new_mbuf:
6480                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6481                                         if (outchain == NULL) {
6482                                                 goto error_out;
6483                                         }
6484                                         SCTP_BUF_LEN(outchain) = 0;
6485                                         *endofchain = outchain;
6486                                         /* get the prepend space */
6487                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6488                                 } else {
6489                                         /*
6490                                          * We really should not get a NULL
6491                                          * in endofchain
6492                                          */
6493                                         /* find end */
6494                                         m = outchain;
6495                                         while (m) {
6496                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6497                                                         *endofchain = m;
6498                                                         break;
6499                                                 }
6500                                                 m = SCTP_BUF_NEXT(m);
6501                                         }
6502                                         /* sanity */
6503                                         if (*endofchain == NULL) {
6504                                                 /*
6505                                                  * huh, TSNH XXX maybe we
6506                                                  * should panic
6507                                                  */
6508                                                 sctp_m_freem(outchain);
6509                                                 goto new_mbuf;
6510                                         }
6511                                 }
6512                                 /* get the new end of length */
6513                                 len = (int)M_TRAILINGSPACE(*endofchain);
6514                         } else {
6515                                 /* how much is left at the end? */
6516                                 len = (int)M_TRAILINGSPACE(*endofchain);
6517                         }
6518                         /* Find the end of the data, for appending */
6519                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6520
6521                         /* Now lets copy it out */
6522                         if (len >= sizeofcpy) {
6523                                 /* It all fits, copy it in */
6524                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6525                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6526                         } else {
6527                                 /* fill up the end of the chain */
6528                                 if (len > 0) {
6529                                         m_copydata(clonechain, 0, len, cp);
6530                                         SCTP_BUF_LEN((*endofchain)) += len;
6531                                         /* now we need another one */
6532                                         sizeofcpy -= len;
6533                                 }
6534                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6535                                 if (m == NULL) {
6536                                         /* We failed */
6537                                         goto error_out;
6538                                 }
6539                                 SCTP_BUF_NEXT((*endofchain)) = m;
6540                                 *endofchain = m;
6541                                 cp = mtod((*endofchain), caddr_t);
6542                                 m_copydata(clonechain, len, sizeofcpy, cp);
6543                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6544                         }
6545                         return (outchain);
6546                 } else {
6547                         /* copy the old fashion way */
6548                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6549 #ifdef SCTP_MBUF_LOGGING
6550                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6551                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6552                         }
6553 #endif
6554                 }
6555         }
6556         if (appendchain == NULL) {
6557                 /* error */
6558                 if (outchain)
6559                         sctp_m_freem(outchain);
6560                 return (NULL);
6561         }
6562         if (outchain) {
6563                 /* tack on to the end */
6564                 if (*endofchain != NULL) {
6565                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6566                 } else {
6567                         m = outchain;
6568                         while (m) {
6569                                 if (SCTP_BUF_NEXT(m) == NULL) {
6570                                         SCTP_BUF_NEXT(m) = appendchain;
6571                                         break;
6572                                 }
6573                                 m = SCTP_BUF_NEXT(m);
6574                         }
6575                 }
6576                 /*
6577                  * save off the end and update the end-chain position
6578                  */
6579                 m = appendchain;
6580                 while (m) {
6581                         if (SCTP_BUF_NEXT(m) == NULL) {
6582                                 *endofchain = m;
6583                                 break;
6584                         }
6585                         m = SCTP_BUF_NEXT(m);
6586                 }
6587                 return (outchain);
6588         } else {
6589                 /* save off the end and update the end-chain position */
6590                 m = appendchain;
6591                 while (m) {
6592                         if (SCTP_BUF_NEXT(m) == NULL) {
6593                                 *endofchain = m;
6594                                 break;
6595                         }
6596                         m = SCTP_BUF_NEXT(m);
6597                 }
6598                 return (appendchain);
6599         }
6600 }
6601
6602 static int
6603 sctp_med_chunk_output(struct sctp_inpcb *inp,
6604     struct sctp_tcb *stcb,
6605     struct sctp_association *asoc,
6606     int *num_out,
6607     int *reason_code,
6608     int control_only, int from_where,
6609     struct timeval *now, int *now_filled, int frag_point, int so_locked
6610 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6611     SCTP_UNUSED
6612 #endif
6613 );
6614
6615 static void
6616 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6617     uint32_t val SCTP_UNUSED)
6618 {
6619         struct sctp_copy_all *ca;
6620         struct mbuf *m;
6621         int ret = 0;
6622         int added_control = 0;
6623         int un_sent, do_chunk_output = 1;
6624         struct sctp_association *asoc;
6625         struct sctp_nets *net;
6626
6627         ca = (struct sctp_copy_all *)ptr;
6628         if (ca->m == NULL) {
6629                 return;
6630         }
6631         if (ca->inp != inp) {
6632                 /* TSNH */
6633                 return;
6634         }
6635         if (ca->sndlen > 0) {
6636                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6637                 if (m == NULL) {
6638                         /* can't copy so we are done */
6639                         ca->cnt_failed++;
6640                         return;
6641                 }
6642 #ifdef SCTP_MBUF_LOGGING
6643                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6644                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6645                 }
6646 #endif
6647         } else {
6648                 m = NULL;
6649         }
6650         SCTP_TCB_LOCK_ASSERT(stcb);
6651         if (stcb->asoc.alternate) {
6652                 net = stcb->asoc.alternate;
6653         } else {
6654                 net = stcb->asoc.primary_destination;
6655         }
6656         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6657                 /* Abort this assoc with m as the user defined reason */
6658                 if (m != NULL) {
6659                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6660                 } else {
6661                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6662                             0, M_NOWAIT, 1, MT_DATA);
6663                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6664                 }
6665                 if (m != NULL) {
6666                         struct sctp_paramhdr *ph;
6667
6668                         ph = mtod(m, struct sctp_paramhdr *);
6669                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6670                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6671                 }
6672                 /*
6673                  * We add one here to keep the assoc from dis-appearing on
6674                  * us.
6675                  */
6676                 atomic_add_int(&stcb->asoc.refcnt, 1);
6677                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6678                 /*
6679                  * sctp_abort_an_association calls sctp_free_asoc() free
6680                  * association will NOT free it since we incremented the
6681                  * refcnt .. we do this to prevent it being freed and things
6682                  * getting tricky since we could end up (from free_asoc)
6683                  * calling inpcb_free which would get a recursive lock call
6684                  * to the iterator lock.. But as a consequence of that the
6685                  * stcb will return to us un-locked.. since free_asoc
6686                  * returns with either no TCB or the TCB unlocked, we must
6687                  * relock.. to unlock in the iterator timer :-0
6688                  */
6689                 SCTP_TCB_LOCK(stcb);
6690                 atomic_add_int(&stcb->asoc.refcnt, -1);
6691                 goto no_chunk_output;
6692         } else {
6693                 if (m) {
6694                         ret = sctp_msg_append(stcb, net, m,
6695                             &ca->sndrcv, 1);
6696                 }
6697                 asoc = &stcb->asoc;
6698                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6699                         /* shutdown this assoc */
6700                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6701                             TAILQ_EMPTY(&asoc->sent_queue) &&
6702                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6703                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6704                                         goto abort_anyway;
6705                                 }
6706                                 /*
6707                                  * there is nothing queued to send, so I'm
6708                                  * done...
6709                                  */
6710                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6711                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6712                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6713                                         /*
6714                                          * only send SHUTDOWN the first time
6715                                          * through
6716                                          */
6717                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6718                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6719                                         }
6720                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6721                                         sctp_stop_timers_for_shutdown(stcb);
6722                                         sctp_send_shutdown(stcb, net);
6723                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6724                                             net);
6725                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6726                                             asoc->primary_destination);
6727                                         added_control = 1;
6728                                         do_chunk_output = 0;
6729                                 }
6730                         } else {
6731                                 /*
6732                                  * we still got (or just got) data to send,
6733                                  * so set SHUTDOWN_PENDING
6734                                  */
6735                                 /*
6736                                  * XXX sockets draft says that SCTP_EOF
6737                                  * should be sent with no data.  currently,
6738                                  * we will allow user data to be sent first
6739                                  * and move to SHUTDOWN-PENDING
6740                                  */
6741                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6742                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6743                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6744                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6745                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6746                                         }
6747                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6748                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6749                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6750                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6751                                                 struct mbuf *op_err;
6752                                                 char msg[SCTP_DIAG_INFO_LEN];
6753
6754                                 abort_anyway:
6755                                                 snprintf(msg, sizeof(msg),
6756                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6757                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6758                                                     msg);
6759                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6760                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6761                                                     op_err, SCTP_SO_NOT_LOCKED);
6762                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6763                                                 goto no_chunk_output;
6764                                         }
6765                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6766                                             asoc->primary_destination);
6767                                 }
6768                         }
6769
6770                 }
6771         }
6772         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6773             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6774
6775         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6776             (stcb->asoc.total_flight > 0) &&
6777             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6778                 do_chunk_output = 0;
6779         }
6780         if (do_chunk_output)
6781                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6782         else if (added_control) {
6783                 int num_out, reason, now_filled = 0;
6784                 struct timeval now;
6785                 int frag_point;
6786
6787                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6788                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6789                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6790         }
6791 no_chunk_output:
6792         if (ret) {
6793                 ca->cnt_failed++;
6794         } else {
6795                 ca->cnt_sent++;
6796         }
6797 }
6798
6799 static void
6800 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6801 {
6802         struct sctp_copy_all *ca;
6803
6804         ca = (struct sctp_copy_all *)ptr;
6805         /*
6806          * Do a notify here? Kacheong suggests that the notify be done at
6807          * the send time.. so you would push up a notification if any send
6808          * failed. Don't know if this is feasible since the only failures we
6809          * have is "memory" related and if you cannot get an mbuf to send
6810          * the data you surely can't get an mbuf to send up to notify the
6811          * user you can't send the data :->
6812          */
6813
6814         /* now free everything */
6815         sctp_m_freem(ca->m);
6816         SCTP_FREE(ca, SCTP_M_COPYAL);
6817 }
6818
6819 static struct mbuf *
6820 sctp_copy_out_all(struct uio *uio, int len)
6821 {
6822         struct mbuf *ret, *at;
6823         int left, willcpy, cancpy, error;
6824
6825         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6826         if (ret == NULL) {
6827                 /* TSNH */
6828                 return (NULL);
6829         }
6830         left = len;
6831         SCTP_BUF_LEN(ret) = 0;
6832         /* save space for the data chunk header */
6833         cancpy = (int)M_TRAILINGSPACE(ret);
6834         willcpy = min(cancpy, left);
6835         at = ret;
6836         while (left > 0) {
6837                 /* Align data to the end */
6838                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6839                 if (error) {
6840         err_out_now:
6841                         sctp_m_freem(at);
6842                         return (NULL);
6843                 }
6844                 SCTP_BUF_LEN(at) = willcpy;
6845                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6846                 left -= willcpy;
6847                 if (left > 0) {
6848                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6849                         if (SCTP_BUF_NEXT(at) == NULL) {
6850                                 goto err_out_now;
6851                         }
6852                         at = SCTP_BUF_NEXT(at);
6853                         SCTP_BUF_LEN(at) = 0;
6854                         cancpy = (int)M_TRAILINGSPACE(at);
6855                         willcpy = min(cancpy, left);
6856                 }
6857         }
6858         return (ret);
6859 }
6860
6861 static int
6862 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6863     struct sctp_sndrcvinfo *srcv)
6864 {
6865         int ret;
6866         struct sctp_copy_all *ca;
6867
6868         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6869             SCTP_M_COPYAL);
6870         if (ca == NULL) {
6871                 sctp_m_freem(m);
6872                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6873                 return (ENOMEM);
6874         }
6875         memset(ca, 0, sizeof(struct sctp_copy_all));
6876
6877         ca->inp = inp;
6878         if (srcv) {
6879                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6880         }
6881         /*
6882          * take off the sendall flag, it would be bad if we failed to do
6883          * this :-0
6884          */
6885         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6886         /* get length and mbuf chain */
6887         if (uio) {
6888                 ca->sndlen = (int)uio->uio_resid;
6889                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6890                 if (ca->m == NULL) {
6891                         SCTP_FREE(ca, SCTP_M_COPYAL);
6892                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6893                         return (ENOMEM);
6894                 }
6895         } else {
6896                 /* Gather the length of the send */
6897                 struct mbuf *mat;
6898
6899                 ca->sndlen = 0;
6900                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6901                         ca->sndlen += SCTP_BUF_LEN(mat);
6902                 }
6903         }
6904         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6905             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6906             SCTP_ASOC_ANY_STATE,
6907             (void *)ca, 0,
6908             sctp_sendall_completes, inp, 1);
6909         if (ret) {
6910                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6911                 SCTP_FREE(ca, SCTP_M_COPYAL);
6912                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6913                 return (EFAULT);
6914         }
6915         return (0);
6916 }
6917
6918
6919 void
6920 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6921 {
6922         struct sctp_tmit_chunk *chk, *nchk;
6923
6924         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6925                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6926                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6927                         asoc->ctrl_queue_cnt--;
6928                         if (chk->data) {
6929                                 sctp_m_freem(chk->data);
6930                                 chk->data = NULL;
6931                         }
6932                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6933                 }
6934         }
6935 }
6936
6937 void
6938 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6939 {
6940         struct sctp_association *asoc;
6941         struct sctp_tmit_chunk *chk, *nchk;
6942         struct sctp_asconf_chunk *acp;
6943
6944         asoc = &stcb->asoc;
6945         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6946                 /* find SCTP_ASCONF chunk in queue */
6947                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6948                         if (chk->data) {
6949                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6950                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6951                                         /* Not Acked yet */
6952                                         break;
6953                                 }
6954                         }
6955                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6956                         asoc->ctrl_queue_cnt--;
6957                         if (chk->data) {
6958                                 sctp_m_freem(chk->data);
6959                                 chk->data = NULL;
6960                         }
6961                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6962                 }
6963         }
6964 }
6965
6966
6967 static void
6968 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6969     struct sctp_association *asoc,
6970     struct sctp_tmit_chunk **data_list,
6971     int bundle_at,
6972     struct sctp_nets *net)
6973 {
6974         int i;
6975         struct sctp_tmit_chunk *tp1;
6976
6977         for (i = 0; i < bundle_at; i++) {
6978                 /* off of the send queue */
6979                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6980                 asoc->send_queue_cnt--;
6981                 if (i > 0) {
6982                         /*
6983                          * Any chunk NOT 0 you zap the time chunk 0 gets
6984                          * zapped or set based on if a RTO measurment is
6985                          * needed.
6986                          */
6987                         data_list[i]->do_rtt = 0;
6988                 }
6989                 /* record time */
6990                 data_list[i]->sent_rcv_time = net->last_sent_time;
6991                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6992                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6993                 if (data_list[i]->whoTo == NULL) {
6994                         data_list[i]->whoTo = net;
6995                         atomic_add_int(&net->ref_count, 1);
6996                 }
6997                 /* on to the sent queue */
6998                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6999                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7000                         struct sctp_tmit_chunk *tpp;
7001
7002                         /* need to move back */
7003         back_up_more:
7004                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7005                         if (tpp == NULL) {
7006                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7007                                 goto all_done;
7008                         }
7009                         tp1 = tpp;
7010                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7011                                 goto back_up_more;
7012                         }
7013                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7014                 } else {
7015                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7016                             data_list[i],
7017                             sctp_next);
7018                 }
7019 all_done:
7020                 /* This does not lower until the cum-ack passes it */
7021                 asoc->sent_queue_cnt++;
7022                 if ((asoc->peers_rwnd <= 0) &&
7023                     (asoc->total_flight == 0) &&
7024                     (bundle_at == 1)) {
7025                         /* Mark the chunk as being a window probe */
7026                         SCTP_STAT_INCR(sctps_windowprobed);
7027                 }
7028 #ifdef SCTP_AUDITING_ENABLED
7029                 sctp_audit_log(0xC2, 3);
7030 #endif
7031                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7032                 data_list[i]->snd_count = 1;
7033                 data_list[i]->rec.data.chunk_was_revoked = 0;
7034                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7035                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7036                             data_list[i]->whoTo->flight_size,
7037                             data_list[i]->book_size,
7038                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7039                             data_list[i]->rec.data.tsn);
7040                 }
7041                 sctp_flight_size_increase(data_list[i]);
7042                 sctp_total_flight_increase(stcb, data_list[i]);
7043                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7044                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7045                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7046                 }
7047                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7048                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7049                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7050                         /* SWS sender side engages */
7051                         asoc->peers_rwnd = 0;
7052                 }
7053         }
7054         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7055                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7056         }
7057 }
7058
7059 static void
7060 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7061 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7062     SCTP_UNUSED
7063 #endif
7064 )
7065 {
7066         struct sctp_tmit_chunk *chk, *nchk;
7067
7068         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7069                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7070                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7071                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7072                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7073                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7074                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7075                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7076                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7077                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7078                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7079                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7080                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7081                         /* Stray chunks must be cleaned up */
7082         clean_up_anyway:
7083                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7084                         asoc->ctrl_queue_cnt--;
7085                         if (chk->data) {
7086                                 sctp_m_freem(chk->data);
7087                                 chk->data = NULL;
7088                         }
7089                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7090                                 asoc->fwd_tsn_cnt--;
7091                         }
7092                         sctp_free_a_chunk(stcb, chk, so_locked);
7093                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7094                         /* special handling, we must look into the param */
7095                         if (chk != asoc->str_reset) {
7096                                 goto clean_up_anyway;
7097                         }
7098                 }
7099         }
7100 }
7101
7102 static uint32_t
7103 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7104     uint32_t space_left, uint32_t frag_point, int eeor_on)
7105 {
7106         /*
7107          * Make a decision on if I should split a msg into multiple parts.
7108          * This is only asked of incomplete messages.
7109          */
7110         if (eeor_on) {
7111                 /*
7112                  * If we are doing EEOR we need to always send it if its the
7113                  * entire thing, since it might be all the guy is putting in
7114                  * the hopper.
7115                  */
7116                 if (space_left >= length) {
7117                         /*-
7118                          * If we have data outstanding,
7119                          * we get another chance when the sack
7120                          * arrives to transmit - wait for more data
7121                          */
7122                         if (stcb->asoc.total_flight == 0) {
7123                                 /*
7124                                  * If nothing is in flight, we zero the
7125                                  * packet counter.
7126                                  */
7127                                 return (length);
7128                         }
7129                         return (0);
7130
7131                 } else {
7132                         /* You can fill the rest */
7133                         return (space_left);
7134                 }
7135         }
7136         /*-
7137          * For those strange folk that make the send buffer
7138          * smaller than our fragmentation point, we can't
7139          * get a full msg in so we have to allow splitting.
7140          */
7141         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7142                 return (length);
7143         }
7144         if ((length <= space_left) ||
7145             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7146                 /* Sub-optimial residual don't split in non-eeor mode. */
7147                 return (0);
7148         }
7149         /*
7150          * If we reach here length is larger than the space_left. Do we wish
7151          * to split it for the sake of packet putting together?
7152          */
7153         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7154                 /* Its ok to split it */
7155                 return (min(space_left, frag_point));
7156         }
7157         /* Nope, can't split */
7158         return (0);
7159 }
7160
7161 static uint32_t
7162 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7163     struct sctp_stream_out *strq,
7164     uint32_t space_left,
7165     uint32_t frag_point,
7166     int *giveup,
7167     int eeor_mode,
7168     int *bail,
7169     int so_locked
7170 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7171     SCTP_UNUSED
7172 #endif
7173 )
7174 {
7175         /* Move from the stream to the send_queue keeping track of the total */
7176         struct sctp_association *asoc;
7177         struct sctp_stream_queue_pending *sp;
7178         struct sctp_tmit_chunk *chk;
7179         struct sctp_data_chunk *dchkh = NULL;
7180         struct sctp_idata_chunk *ndchkh = NULL;
7181         uint32_t to_move, length;
7182         int leading;
7183         uint8_t rcv_flags = 0;
7184         uint8_t some_taken;
7185         uint8_t send_lock_up = 0;
7186
7187         SCTP_TCB_LOCK_ASSERT(stcb);
7188         asoc = &stcb->asoc;
7189 one_more_time:
7190         /* sa_ignore FREED_MEMORY */
7191         sp = TAILQ_FIRST(&strq->outqueue);
7192         if (sp == NULL) {
7193                 if (send_lock_up == 0) {
7194                         SCTP_TCB_SEND_LOCK(stcb);
7195                         send_lock_up = 1;
7196                 }
7197                 sp = TAILQ_FIRST(&strq->outqueue);
7198                 if (sp) {
7199                         goto one_more_time;
7200                 }
7201                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7202                     (stcb->asoc.idata_supported == 0) &&
7203                     (strq->last_msg_incomplete)) {
7204                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7205                             strq->sid,
7206                             strq->last_msg_incomplete);
7207                         strq->last_msg_incomplete = 0;
7208                 }
7209                 to_move = 0;
7210                 if (send_lock_up) {
7211                         SCTP_TCB_SEND_UNLOCK(stcb);
7212                         send_lock_up = 0;
7213                 }
7214                 goto out_of;
7215         }
7216         if ((sp->msg_is_complete) && (sp->length == 0)) {
7217                 if (sp->sender_all_done) {
7218                         /*
7219                          * We are doing deferred cleanup. Last time through
7220                          * when we took all the data the sender_all_done was
7221                          * not set.
7222                          */
7223                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7224                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7225                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7226                                     sp->sender_all_done,
7227                                     sp->length,
7228                                     sp->msg_is_complete,
7229                                     sp->put_last_out,
7230                                     send_lock_up);
7231                         }
7232                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7233                                 SCTP_TCB_SEND_LOCK(stcb);
7234                                 send_lock_up = 1;
7235                         }
7236                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7237                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7238                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7239                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7240                             (strq->chunks_on_queues == 0) &&
7241                             TAILQ_EMPTY(&strq->outqueue)) {
7242                                 stcb->asoc.trigger_reset = 1;
7243                         }
7244                         if (sp->net) {
7245                                 sctp_free_remote_addr(sp->net);
7246                                 sp->net = NULL;
7247                         }
7248                         if (sp->data) {
7249                                 sctp_m_freem(sp->data);
7250                                 sp->data = NULL;
7251                         }
7252                         sctp_free_a_strmoq(stcb, sp, so_locked);
7253                         /* we can't be locked to it */
7254                         if (send_lock_up) {
7255                                 SCTP_TCB_SEND_UNLOCK(stcb);
7256                                 send_lock_up = 0;
7257                         }
7258                         /* back to get the next msg */
7259                         goto one_more_time;
7260                 } else {
7261                         /*
7262                          * sender just finished this but still holds a
7263                          * reference
7264                          */
7265                         *giveup = 1;
7266                         to_move = 0;
7267                         goto out_of;
7268                 }
7269         } else {
7270                 /* is there some to get */
7271                 if (sp->length == 0) {
7272                         /* no */
7273                         *giveup = 1;
7274                         to_move = 0;
7275                         goto out_of;
7276                 } else if (sp->discard_rest) {
7277                         if (send_lock_up == 0) {
7278                                 SCTP_TCB_SEND_LOCK(stcb);
7279                                 send_lock_up = 1;
7280                         }
7281                         /* Whack down the size */
7282                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7283                         if ((stcb->sctp_socket != NULL) &&
7284                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7285                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7286                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7287                         }
7288                         if (sp->data) {
7289                                 sctp_m_freem(sp->data);
7290                                 sp->data = NULL;
7291                                 sp->tail_mbuf = NULL;
7292                         }
7293                         sp->length = 0;
7294                         sp->some_taken = 1;
7295                         *giveup = 1;
7296                         to_move = 0;
7297                         goto out_of;
7298                 }
7299         }
7300         some_taken = sp->some_taken;
7301 re_look:
7302         length = sp->length;
7303         if (sp->msg_is_complete) {
7304                 /* The message is complete */
7305                 to_move = min(length, frag_point);
7306                 if (to_move == length) {
7307                         /* All of it fits in the MTU */
7308                         if (sp->some_taken) {
7309                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7310                         } else {
7311                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7312                         }
7313                         sp->put_last_out = 1;
7314                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7315                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7316                         }
7317                 } else {
7318                         /* Not all of it fits, we fragment */
7319                         if (sp->some_taken == 0) {
7320                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7321                         }
7322                         sp->some_taken = 1;
7323                 }
7324         } else {
7325                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7326                 if (to_move) {
7327                         /*-
7328                          * We use a snapshot of length in case it
7329                          * is expanding during the compare.
7330                          */
7331                         uint32_t llen;
7332
7333                         llen = length;
7334                         if (to_move >= llen) {
7335                                 to_move = llen;
7336                                 if (send_lock_up == 0) {
7337                                         /*-
7338                                          * We are taking all of an incomplete msg
7339                                          * thus we need a send lock.
7340                                          */
7341                                         SCTP_TCB_SEND_LOCK(stcb);
7342                                         send_lock_up = 1;
7343                                         if (sp->msg_is_complete) {
7344                                                 /*
7345                                                  * the sender finished the
7346                                                  * msg
7347                                                  */
7348                                                 goto re_look;
7349                                         }
7350                                 }
7351                         }
7352                         if (sp->some_taken == 0) {
7353                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7354                                 sp->some_taken = 1;
7355                         }
7356                 } else {
7357                         /* Nothing to take. */
7358                         *giveup = 1;
7359                         to_move = 0;
7360                         goto out_of;
7361                 }
7362         }
7363
7364         /* If we reach here, we can copy out a chunk */
7365         sctp_alloc_a_chunk(stcb, chk);
7366         if (chk == NULL) {
7367                 /* No chunk memory */
7368                 *giveup = 1;
7369                 to_move = 0;
7370                 goto out_of;
7371         }
7372         /*
7373          * Setup for unordered if needed by looking at the user sent info
7374          * flags.
7375          */
7376         if (sp->sinfo_flags & SCTP_UNORDERED) {
7377                 rcv_flags |= SCTP_DATA_UNORDERED;
7378         }
7379         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7380             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7381                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7382         }
7383         /* clear out the chunk before setting up */
7384         memset(chk, 0, sizeof(*chk));
7385         chk->rec.data.rcv_flags = rcv_flags;
7386
7387         if (to_move >= length) {
7388                 /* we think we can steal the whole thing */
7389                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7390                         SCTP_TCB_SEND_LOCK(stcb);
7391                         send_lock_up = 1;
7392                 }
7393                 if (to_move < sp->length) {
7394                         /* bail, it changed */
7395                         goto dont_do_it;
7396                 }
7397                 chk->data = sp->data;
7398                 chk->last_mbuf = sp->tail_mbuf;
7399                 /* register the stealing */
7400                 sp->data = sp->tail_mbuf = NULL;
7401         } else {
7402                 struct mbuf *m;
7403
7404 dont_do_it:
7405                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7406                 chk->last_mbuf = NULL;
7407                 if (chk->data == NULL) {
7408                         sp->some_taken = some_taken;
7409                         sctp_free_a_chunk(stcb, chk, so_locked);
7410                         *bail = 1;
7411                         to_move = 0;
7412                         goto out_of;
7413                 }
7414 #ifdef SCTP_MBUF_LOGGING
7415                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7416                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7417                 }
7418 #endif
7419                 /* Pull off the data */
7420                 m_adj(sp->data, to_move);
7421                 /* Now lets work our way down and compact it */
7422                 m = sp->data;
7423                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7424                         sp->data = SCTP_BUF_NEXT(m);
7425                         SCTP_BUF_NEXT(m) = NULL;
7426                         if (sp->tail_mbuf == m) {
7427                                 /*-
7428                                  * Freeing tail? TSNH since
7429                                  * we supposedly were taking less
7430                                  * than the sp->length.
7431                                  */
7432 #ifdef INVARIANTS
7433                                 panic("Huh, freing tail? - TSNH");
7434 #else
7435                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7436                                 sp->tail_mbuf = sp->data = NULL;
7437                                 sp->length = 0;
7438 #endif
7439
7440                         }
7441                         sctp_m_free(m);
7442                         m = sp->data;
7443                 }
7444         }
7445         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7446                 chk->copy_by_ref = 1;
7447         } else {
7448                 chk->copy_by_ref = 0;
7449         }
7450         /*
7451          * get last_mbuf and counts of mb usage This is ugly but hopefully
7452          * its only one mbuf.
7453          */
7454         if (chk->last_mbuf == NULL) {
7455                 chk->last_mbuf = chk->data;
7456                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7457                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7458                 }
7459         }
7460
7461         if (to_move > length) {
7462                 /*- This should not happen either
7463                  * since we always lower to_move to the size
7464                  * of sp->length if its larger.
7465                  */
7466 #ifdef INVARIANTS
7467                 panic("Huh, how can to_move be larger?");
7468 #else
7469                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7470                 sp->length = 0;
7471 #endif
7472         } else {
7473                 atomic_subtract_int(&sp->length, to_move);
7474         }
7475         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7476         if (M_LEADINGSPACE(chk->data) < leading) {
7477                 /* Not enough room for a chunk header, get some */
7478                 struct mbuf *m;
7479
7480                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7481                 if (m == NULL) {
7482                         /*
7483                          * we're in trouble here. _PREPEND below will free
7484                          * all the data if there is no leading space, so we
7485                          * must put the data back and restore.
7486                          */
7487                         if (send_lock_up == 0) {
7488                                 SCTP_TCB_SEND_LOCK(stcb);
7489                                 send_lock_up = 1;
7490                         }
7491                         if (sp->data == NULL) {
7492                                 /* unsteal the data */
7493                                 sp->data = chk->data;
7494                                 sp->tail_mbuf = chk->last_mbuf;
7495                         } else {
7496                                 struct mbuf *m_tmp;
7497
7498                                 /* reassemble the data */
7499                                 m_tmp = sp->data;
7500                                 sp->data = chk->data;
7501                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7502                         }
7503                         sp->some_taken = some_taken;
7504                         atomic_add_int(&sp->length, to_move);
7505                         chk->data = NULL;
7506                         *bail = 1;
7507                         sctp_free_a_chunk(stcb, chk, so_locked);
7508                         to_move = 0;
7509                         goto out_of;
7510                 } else {
7511                         SCTP_BUF_LEN(m) = 0;
7512                         SCTP_BUF_NEXT(m) = chk->data;
7513                         chk->data = m;
7514                         M_ALIGN(chk->data, 4);
7515                 }
7516         }
7517         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7518         if (chk->data == NULL) {
7519                 /* HELP, TSNH since we assured it would not above? */
7520 #ifdef INVARIANTS
7521                 panic("prepend failes HELP?");
7522 #else
7523                 SCTP_PRINTF("prepend fails HELP?\n");
7524                 sctp_free_a_chunk(stcb, chk, so_locked);
7525 #endif
7526                 *bail = 1;
7527                 to_move = 0;
7528                 goto out_of;
7529         }
7530         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7531         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7532         chk->book_size_scale = 0;
7533         chk->sent = SCTP_DATAGRAM_UNSENT;
7534
7535         chk->flags = 0;
7536         chk->asoc = &stcb->asoc;
7537         chk->pad_inplace = 0;
7538         chk->no_fr_allowed = 0;
7539         if (stcb->asoc.idata_supported == 0) {
7540                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7541                         /* Just use 0. The receiver ignores the values. */
7542                         chk->rec.data.mid = 0;
7543                 } else {
7544                         chk->rec.data.mid = strq->next_mid_ordered;
7545                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7546                                 strq->next_mid_ordered++;
7547                         }
7548                 }
7549         } else {
7550                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7551                         chk->rec.data.mid = strq->next_mid_unordered;
7552                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7553                                 strq->next_mid_unordered++;
7554                         }
7555                 } else {
7556                         chk->rec.data.mid = strq->next_mid_ordered;
7557                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7558                                 strq->next_mid_ordered++;
7559                         }
7560                 }
7561         }
7562         chk->rec.data.sid = sp->sid;
7563         chk->rec.data.ppid = sp->ppid;
7564         chk->rec.data.context = sp->context;
7565         chk->rec.data.doing_fast_retransmit = 0;
7566
7567         chk->rec.data.timetodrop = sp->ts;
7568         chk->flags = sp->act_flags;
7569
7570         if (sp->net) {
7571                 chk->whoTo = sp->net;
7572                 atomic_add_int(&chk->whoTo->ref_count, 1);
7573         } else
7574                 chk->whoTo = NULL;
7575
7576         if (sp->holds_key_ref) {
7577                 chk->auth_keyid = sp->auth_keyid;
7578                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7579                 chk->holds_key_ref = 1;
7580         }
7581         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7582         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7583                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7584                     (uint32_t)(uintptr_t)stcb, sp->length,
7585                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7586                     chk->rec.data.tsn);
7587         }
7588         if (stcb->asoc.idata_supported == 0) {
7589                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7590         } else {
7591                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7592         }
7593         /*
7594          * Put the rest of the things in place now. Size was done earlier in
7595          * previous loop prior to padding.
7596          */
7597
7598 #ifdef SCTP_ASOCLOG_OF_TSNS
7599         SCTP_TCB_LOCK_ASSERT(stcb);
7600         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7601                 asoc->tsn_out_at = 0;
7602                 asoc->tsn_out_wrapped = 1;
7603         }
7604         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7605         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7606         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7607         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7608         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7609         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7610         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7611         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7612         asoc->tsn_out_at++;
7613 #endif
7614         if (stcb->asoc.idata_supported == 0) {
7615                 dchkh->ch.chunk_type = SCTP_DATA;
7616                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7617                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7618                 dchkh->dp.sid = htons(strq->sid);
7619                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7620                 dchkh->dp.ppid = chk->rec.data.ppid;
7621                 dchkh->ch.chunk_length = htons(chk->send_size);
7622         } else {
7623                 ndchkh->ch.chunk_type = SCTP_IDATA;
7624                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7625                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7626                 ndchkh->dp.sid = htons(strq->sid);
7627                 ndchkh->dp.reserved = htons(0);
7628                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7629                 if (sp->fsn == 0)
7630                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7631                 else
7632                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7633                 sp->fsn++;
7634                 ndchkh->ch.chunk_length = htons(chk->send_size);
7635         }
7636         /* Now advance the chk->send_size by the actual pad needed. */
7637         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7638                 /* need a pad */
7639                 struct mbuf *lm;
7640                 int pads;
7641
7642                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7643                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7644                 if (lm != NULL) {
7645                         chk->last_mbuf = lm;
7646                         chk->pad_inplace = 1;
7647                 }
7648                 chk->send_size += pads;
7649         }
7650         if (PR_SCTP_ENABLED(chk->flags)) {
7651                 asoc->pr_sctp_cnt++;
7652         }
7653         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7654                 /* All done pull and kill the message */
7655                 if (sp->put_last_out == 0) {
7656                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7657                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7658                             sp->sender_all_done,
7659                             sp->length,
7660                             sp->msg_is_complete,
7661                             sp->put_last_out,
7662                             send_lock_up);
7663                 }
7664                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7665                         SCTP_TCB_SEND_LOCK(stcb);
7666                         send_lock_up = 1;
7667                 }
7668                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7669                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7670                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7671                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7672                     (strq->chunks_on_queues == 0) &&
7673                     TAILQ_EMPTY(&strq->outqueue)) {
7674                         stcb->asoc.trigger_reset = 1;
7675                 }
7676                 if (sp->net) {
7677                         sctp_free_remote_addr(sp->net);
7678                         sp->net = NULL;
7679                 }
7680                 if (sp->data) {
7681                         sctp_m_freem(sp->data);
7682                         sp->data = NULL;
7683                 }
7684                 sctp_free_a_strmoq(stcb, sp, so_locked);
7685         }
7686         asoc->chunks_on_out_queue++;
7687         strq->chunks_on_queues++;
7688         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7689         asoc->send_queue_cnt++;
7690 out_of:
7691         if (send_lock_up) {
7692                 SCTP_TCB_SEND_UNLOCK(stcb);
7693         }
7694         return (to_move);
7695 }
7696
7697
7698 static void
7699 sctp_fill_outqueue(struct sctp_tcb *stcb,
7700     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7701 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7702     SCTP_UNUSED
7703 #endif
7704 )
7705 {
7706         struct sctp_association *asoc;
7707         struct sctp_stream_out *strq;
7708         uint32_t space_left, moved, total_moved;
7709         int bail, giveup;
7710
7711         SCTP_TCB_LOCK_ASSERT(stcb);
7712         asoc = &stcb->asoc;
7713         total_moved = 0;
7714         switch (net->ro._l_addr.sa.sa_family) {
7715 #ifdef INET
7716         case AF_INET:
7717                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7718                 break;
7719 #endif
7720 #ifdef INET6
7721         case AF_INET6:
7722                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7723                 break;
7724 #endif
7725         default:
7726                 /* TSNH */
7727                 space_left = net->mtu;
7728                 break;
7729         }
7730         /* Need an allowance for the data chunk header too */
7731         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7732
7733         /* must make even word boundary */
7734         space_left &= 0xfffffffc;
7735         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7736         giveup = 0;
7737         bail = 0;
7738         while ((space_left > 0) && (strq != NULL)) {
7739                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7740                     &giveup, eeor_mode, &bail, so_locked);
7741                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7742                 if ((giveup != 0) || (bail != 0)) {
7743                         break;
7744                 }
7745                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7746                 total_moved += moved;
7747                 space_left -= moved;
7748                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7749                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7750                 } else {
7751                         space_left = 0;
7752                 }
7753                 space_left &= 0xfffffffc;
7754         }
7755         if (bail != 0)
7756                 *quit_now = 1;
7757
7758         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7759
7760         if (total_moved == 0) {
7761                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7762                     (net == stcb->asoc.primary_destination)) {
7763                         /* ran dry for primary network net */
7764                         SCTP_STAT_INCR(sctps_primary_randry);
7765                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7766                         /* ran dry with CMT on */
7767                         SCTP_STAT_INCR(sctps_cmt_randry);
7768                 }
7769         }
7770 }
7771
7772 void
7773 sctp_fix_ecn_echo(struct sctp_association *asoc)
7774 {
7775         struct sctp_tmit_chunk *chk;
7776
7777         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7778                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7779                         chk->sent = SCTP_DATAGRAM_UNSENT;
7780                 }
7781         }
7782 }
7783
7784 void
7785 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7786 {
7787         struct sctp_association *asoc;
7788         struct sctp_tmit_chunk *chk;
7789         struct sctp_stream_queue_pending *sp;
7790         unsigned int i;
7791
7792         if (net == NULL) {
7793                 return;
7794         }
7795         asoc = &stcb->asoc;
7796         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7797                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7798                         if (sp->net == net) {
7799                                 sctp_free_remote_addr(sp->net);
7800                                 sp->net = NULL;
7801                         }
7802                 }
7803         }
7804         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7805                 if (chk->whoTo == net) {
7806                         sctp_free_remote_addr(chk->whoTo);
7807                         chk->whoTo = NULL;
7808                 }
7809         }
7810 }
7811
7812 int
7813 sctp_med_chunk_output(struct sctp_inpcb *inp,
7814     struct sctp_tcb *stcb,
7815     struct sctp_association *asoc,
7816     int *num_out,
7817     int *reason_code,
7818     int control_only, int from_where,
7819     struct timeval *now, int *now_filled, int frag_point, int so_locked
7820 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7821     SCTP_UNUSED
7822 #endif
7823 )
7824 {
7825         /**
7826          * Ok this is the generic chunk service queue. we must do the
7827          * following:
7828          * - Service the stream queue that is next, moving any
7829          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7830          *   LAST to the out queue in one pass) and assigning TSN's. This
7831          *   only applys though if the peer does not support NDATA. For NDATA
7832          *   chunks its ok to not send the entire message ;-)
7833          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7834          *   fomulate and send the low level chunks. Making sure to combine
7835          *   any control in the control chunk queue also.
7836          */
7837         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7838         struct mbuf *outchain, *endoutchain;
7839         struct sctp_tmit_chunk *chk, *nchk;
7840
7841         /* temp arrays for unlinking */
7842         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7843         int no_fragmentflg, error;
7844         unsigned int max_rwnd_per_dest, max_send_per_dest;
7845         int one_chunk, hbflag, skip_data_for_this_net;
7846         int asconf, cookie, no_out_cnt;
7847         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7848         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7849         int tsns_sent = 0;
7850         uint32_t auth_offset = 0;
7851         struct sctp_auth_chunk *auth = NULL;
7852         uint16_t auth_keyid;
7853         int override_ok = 1;
7854         int skip_fill_up = 0;
7855         int data_auth_reqd = 0;
7856
7857         /*
7858          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7859          * destination.
7860          */
7861         int quit_now = 0;
7862
7863         *num_out = 0;
7864         *reason_code = 0;
7865         auth_keyid = stcb->asoc.authinfo.active_keyid;
7866         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7867             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7868             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7869                 eeor_mode = 1;
7870         } else {
7871                 eeor_mode = 0;
7872         }
7873         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7874         /*
7875          * First lets prime the pump. For each destination, if there is room
7876          * in the flight size, attempt to pull an MTU's worth out of the
7877          * stream queues into the general send_queue
7878          */
7879 #ifdef SCTP_AUDITING_ENABLED
7880         sctp_audit_log(0xC2, 2);
7881 #endif
7882         SCTP_TCB_LOCK_ASSERT(stcb);
7883         hbflag = 0;
7884         if (control_only)
7885                 no_data_chunks = 1;
7886         else
7887                 no_data_chunks = 0;
7888
7889         /* Nothing to possible to send? */
7890         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7891             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7892             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7893             TAILQ_EMPTY(&asoc->send_queue) &&
7894             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7895 nothing_to_send:
7896                 *reason_code = 9;
7897                 return (0);
7898         }
7899         if (asoc->peers_rwnd == 0) {
7900                 /* No room in peers rwnd */
7901                 *reason_code = 1;
7902                 if (asoc->total_flight > 0) {
7903                         /* we are allowed one chunk in flight */
7904                         no_data_chunks = 1;
7905                 }
7906         }
7907         if (stcb->asoc.ecn_echo_cnt_onq) {
7908                 /* Record where a sack goes, if any */
7909                 if (no_data_chunks &&
7910                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7911                         /* Nothing but ECNe to send - we don't do that */
7912                         goto nothing_to_send;
7913                 }
7914                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7915                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7916                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7917                                 sack_goes_to = chk->whoTo;
7918                                 break;
7919                         }
7920                 }
7921         }
7922         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7923         if (stcb->sctp_socket)
7924                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7925         else
7926                 max_send_per_dest = 0;
7927         if (no_data_chunks == 0) {
7928                 /* How many non-directed chunks are there? */
7929                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7930                         if (chk->whoTo == NULL) {
7931                                 /*
7932                                  * We already have non-directed chunks on
7933                                  * the queue, no need to do a fill-up.
7934                                  */
7935                                 skip_fill_up = 1;
7936                                 break;
7937                         }
7938                 }
7939
7940         }
7941         if ((no_data_chunks == 0) &&
7942             (skip_fill_up == 0) &&
7943             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7944                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7945                         /*
7946                          * This for loop we are in takes in each net, if
7947                          * its's got space in cwnd and has data sent to it
7948                          * (when CMT is off) then it calls
7949                          * sctp_fill_outqueue for the net. This gets data on
7950                          * the send queue for that network.
7951                          *
7952                          * In sctp_fill_outqueue TSN's are assigned and data
7953                          * is copied out of the stream buffers. Note mostly
7954                          * copy by reference (we hope).
7955                          */
7956                         net->window_probe = 0;
7957                         if ((net != stcb->asoc.alternate) &&
7958                             ((net->dest_state & SCTP_ADDR_PF) ||
7959                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7960                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7961                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7962                                         sctp_log_cwnd(stcb, net, 1,
7963                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7964                                 }
7965                                 continue;
7966                         }
7967                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7968                             (net->flight_size == 0)) {
7969                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7970                         }
7971                         if (net->flight_size >= net->cwnd) {
7972                                 /* skip this network, no room - can't fill */
7973                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7974                                         sctp_log_cwnd(stcb, net, 3,
7975                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7976                                 }
7977                                 continue;
7978                         }
7979                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7980                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7981                         }
7982                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7983                         if (quit_now) {
7984                                 /* memory alloc failure */
7985                                 no_data_chunks = 1;
7986                                 break;
7987                         }
7988                 }
7989         }
7990         /* now service each destination and send out what we can for it */
7991         /* Nothing to send? */
7992         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7993             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7994             TAILQ_EMPTY(&asoc->send_queue)) {
7995                 *reason_code = 8;
7996                 return (0);
7997         }
7998
7999         if (asoc->sctp_cmt_on_off > 0) {
8000                 /* get the last start point */
8001                 start_at = asoc->last_net_cmt_send_started;
8002                 if (start_at == NULL) {
8003                         /* null so to beginning */
8004                         start_at = TAILQ_FIRST(&asoc->nets);
8005                 } else {
8006                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8007                         if (start_at == NULL) {
8008                                 start_at = TAILQ_FIRST(&asoc->nets);
8009                         }
8010                 }
8011                 asoc->last_net_cmt_send_started = start_at;
8012         } else {
8013                 start_at = TAILQ_FIRST(&asoc->nets);
8014         }
8015         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8016                 if (chk->whoTo == NULL) {
8017                         if (asoc->alternate) {
8018                                 chk->whoTo = asoc->alternate;
8019                         } else {
8020                                 chk->whoTo = asoc->primary_destination;
8021                         }
8022                         atomic_add_int(&chk->whoTo->ref_count, 1);
8023                 }
8024         }
8025         old_start_at = NULL;
8026 again_one_more_time:
8027         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8028                 /* how much can we send? */
8029                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8030                 if (old_start_at && (old_start_at == net)) {
8031                         /* through list ocmpletely. */
8032                         break;
8033                 }
8034                 tsns_sent = 0xa;
8035                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8036                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8037                     (net->flight_size >= net->cwnd)) {
8038                         /*
8039                          * Nothing on control or asconf and flight is full,
8040                          * we can skip even in the CMT case.
8041                          */
8042                         continue;
8043                 }
8044                 bundle_at = 0;
8045                 endoutchain = outchain = NULL;
8046                 no_fragmentflg = 1;
8047                 one_chunk = 0;
8048                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8049                         skip_data_for_this_net = 1;
8050                 } else {
8051                         skip_data_for_this_net = 0;
8052                 }
8053                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8054 #ifdef INET
8055                 case AF_INET:
8056                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8057                         break;
8058 #endif
8059 #ifdef INET6
8060                 case AF_INET6:
8061                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8062                         break;
8063 #endif
8064                 default:
8065                         /* TSNH */
8066                         mtu = net->mtu;
8067                         break;
8068                 }
8069                 mx_mtu = mtu;
8070                 to_out = 0;
8071                 if (mtu > asoc->peers_rwnd) {
8072                         if (asoc->total_flight > 0) {
8073                                 /* We have a packet in flight somewhere */
8074                                 r_mtu = asoc->peers_rwnd;
8075                         } else {
8076                                 /* We are always allowed to send one MTU out */
8077                                 one_chunk = 1;
8078                                 r_mtu = mtu;
8079                         }
8080                 } else {
8081                         r_mtu = mtu;
8082                 }
8083                 error = 0;
8084                 /************************/
8085                 /* ASCONF transmission */
8086                 /************************/
8087                 /* Now first lets go through the asconf queue */
8088                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8089                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8090                                 continue;
8091                         }
8092                         if (chk->whoTo == NULL) {
8093                                 if (asoc->alternate == NULL) {
8094                                         if (asoc->primary_destination != net) {
8095                                                 break;
8096                                         }
8097                                 } else {
8098                                         if (asoc->alternate != net) {
8099                                                 break;
8100                                         }
8101                                 }
8102                         } else {
8103                                 if (chk->whoTo != net) {
8104                                         break;
8105                                 }
8106                         }
8107                         if (chk->data == NULL) {
8108                                 break;
8109                         }
8110                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8111                             chk->sent != SCTP_DATAGRAM_RESEND) {
8112                                 break;
8113                         }
8114                         /*
8115                          * if no AUTH is yet included and this chunk
8116                          * requires it, make sure to account for it.  We
8117                          * don't apply the size until the AUTH chunk is
8118                          * actually added below in case there is no room for
8119                          * this chunk. NOTE: we overload the use of "omtu"
8120                          * here
8121                          */
8122                         if ((auth == NULL) &&
8123                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8124                             stcb->asoc.peer_auth_chunks)) {
8125                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8126                         } else
8127                                 omtu = 0;
8128                         /* Here we do NOT factor the r_mtu */
8129                         if ((chk->send_size < (int)(mtu - omtu)) ||
8130                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8131                                 /*
8132                                  * We probably should glom the mbuf chain
8133                                  * from the chk->data for control but the
8134                                  * problem is it becomes yet one more level
8135                                  * of tracking to do if for some reason
8136                                  * output fails. Then I have got to
8137                                  * reconstruct the merged control chain.. el
8138                                  * yucko.. for now we take the easy way and
8139                                  * do the copy
8140                                  */
8141                                 /*
8142                                  * Add an AUTH chunk, if chunk requires it
8143                                  * save the offset into the chain for AUTH
8144                                  */
8145                                 if ((auth == NULL) &&
8146                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8147                                     stcb->asoc.peer_auth_chunks))) {
8148                                         outchain = sctp_add_auth_chunk(outchain,
8149                                             &endoutchain,
8150                                             &auth,
8151                                             &auth_offset,
8152                                             stcb,
8153                                             chk->rec.chunk_id.id);
8154                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8155                                 }
8156                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8157                                     (int)chk->rec.chunk_id.can_take_data,
8158                                     chk->send_size, chk->copy_by_ref);
8159                                 if (outchain == NULL) {
8160                                         *reason_code = 8;
8161                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8162                                         return (ENOMEM);
8163                                 }
8164                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8165                                 /* update our MTU size */
8166                                 if (mtu > (chk->send_size + omtu))
8167                                         mtu -= (chk->send_size + omtu);
8168                                 else
8169                                         mtu = 0;
8170                                 to_out += (chk->send_size + omtu);
8171                                 /* Do clear IP_DF ? */
8172                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8173                                         no_fragmentflg = 0;
8174                                 }
8175                                 if (chk->rec.chunk_id.can_take_data)
8176                                         chk->data = NULL;
8177                                 /*
8178                                  * set hb flag since we can use these for
8179                                  * RTO
8180                                  */
8181                                 hbflag = 1;
8182                                 asconf = 1;
8183                                 /*
8184                                  * should sysctl this: don't bundle data
8185                                  * with ASCONF since it requires AUTH
8186                                  */
8187                                 no_data_chunks = 1;
8188                                 chk->sent = SCTP_DATAGRAM_SENT;
8189                                 if (chk->whoTo == NULL) {
8190                                         chk->whoTo = net;
8191                                         atomic_add_int(&net->ref_count, 1);
8192                                 }
8193                                 chk->snd_count++;
8194                                 if (mtu == 0) {
8195                                         /*
8196                                          * Ok we are out of room but we can
8197                                          * output without effecting the
8198                                          * flight size since this little guy
8199                                          * is a control only packet.
8200                                          */
8201                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8202                                         /*
8203                                          * do NOT clear the asconf flag as
8204                                          * it is used to do appropriate
8205                                          * source address selection.
8206                                          */
8207                                         if (*now_filled == 0) {
8208                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8209                                                 *now_filled = 1;
8210                                         }
8211                                         net->last_sent_time = *now;
8212                                         hbflag = 0;
8213                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8214                                             (struct sockaddr *)&net->ro._l_addr,
8215                                             outchain, auth_offset, auth,
8216                                             stcb->asoc.authinfo.active_keyid,
8217                                             no_fragmentflg, 0, asconf,
8218                                             inp->sctp_lport, stcb->rport,
8219                                             htonl(stcb->asoc.peer_vtag),
8220                                             net->port, NULL,
8221                                             0, 0,
8222                                             so_locked))) {
8223                                                 /*
8224                                                  * error, we could not
8225                                                  * output
8226                                                  */
8227                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8228                                                 if (from_where == 0) {
8229                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8230                                                 }
8231                                                 if (error == ENOBUFS) {
8232                                                         asoc->ifp_had_enobuf = 1;
8233                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8234                                                 }
8235                                                 /* error, could not output */
8236                                                 if (error == EHOSTUNREACH) {
8237                                                         /*
8238                                                          * Destination went
8239                                                          * unreachable
8240                                                          * during this send
8241                                                          */
8242                                                         sctp_move_chunks_from_net(stcb, net);
8243                                                 }
8244                                                 *reason_code = 7;
8245                                                 break;
8246                                         } else {
8247                                                 asoc->ifp_had_enobuf = 0;
8248                                         }
8249                                         /*
8250                                          * increase the number we sent, if a
8251                                          * cookie is sent we don't tell them
8252                                          * any was sent out.
8253                                          */
8254                                         outchain = endoutchain = NULL;
8255                                         auth = NULL;
8256                                         auth_offset = 0;
8257                                         if (!no_out_cnt)
8258                                                 *num_out += ctl_cnt;
8259                                         /* recalc a clean slate and setup */
8260                                         switch (net->ro._l_addr.sa.sa_family) {
8261 #ifdef INET
8262                                         case AF_INET:
8263                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8264                                                 break;
8265 #endif
8266 #ifdef INET6
8267                                         case AF_INET6:
8268                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8269                                                 break;
8270 #endif
8271                                         default:
8272                                                 /* TSNH */
8273                                                 mtu = net->mtu;
8274                                                 break;
8275                                         }
8276                                         to_out = 0;
8277                                         no_fragmentflg = 1;
8278                                 }
8279                         }
8280                 }
8281                 if (error != 0) {
8282                         /* try next net */
8283                         continue;
8284                 }
8285                 /************************/
8286                 /* Control transmission */
8287                 /************************/
8288                 /* Now first lets go through the control queue */
8289                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8290                         if ((sack_goes_to) &&
8291                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8292                             (chk->whoTo != sack_goes_to)) {
8293                                 /*
8294                                  * if we have a sack in queue, and we are
8295                                  * looking at an ecn echo that is NOT queued
8296                                  * to where the sack is going..
8297                                  */
8298                                 if (chk->whoTo == net) {
8299                                         /*
8300                                          * Don't transmit it to where its
8301                                          * going (current net)
8302                                          */
8303                                         continue;
8304                                 } else if (sack_goes_to == net) {
8305                                         /*
8306                                          * But do transmit it to this
8307                                          * address
8308                                          */
8309                                         goto skip_net_check;
8310                                 }
8311                         }
8312                         if (chk->whoTo == NULL) {
8313                                 if (asoc->alternate == NULL) {
8314                                         if (asoc->primary_destination != net) {
8315                                                 continue;
8316                                         }
8317                                 } else {
8318                                         if (asoc->alternate != net) {
8319                                                 continue;
8320                                         }
8321                                 }
8322                         } else {
8323                                 if (chk->whoTo != net) {
8324                                         continue;
8325                                 }
8326                         }
8327         skip_net_check:
8328                         if (chk->data == NULL) {
8329                                 continue;
8330                         }
8331                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8332                                 /*
8333                                  * It must be unsent. Cookies and ASCONF's
8334                                  * hang around but there timers will force
8335                                  * when marked for resend.
8336                                  */
8337                                 continue;
8338                         }
8339                         /*
8340                          * if no AUTH is yet included and this chunk
8341                          * requires it, make sure to account for it.  We
8342                          * don't apply the size until the AUTH chunk is
8343                          * actually added below in case there is no room for
8344                          * this chunk. NOTE: we overload the use of "omtu"
8345                          * here
8346                          */
8347                         if ((auth == NULL) &&
8348                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8349                             stcb->asoc.peer_auth_chunks)) {
8350                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8351                         } else
8352                                 omtu = 0;
8353                         /* Here we do NOT factor the r_mtu */
8354                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8355                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8356                                 /*
8357                                  * We probably should glom the mbuf chain
8358                                  * from the chk->data for control but the
8359                                  * problem is it becomes yet one more level
8360                                  * of tracking to do if for some reason
8361                                  * output fails. Then I have got to
8362                                  * reconstruct the merged control chain.. el
8363                                  * yucko.. for now we take the easy way and
8364                                  * do the copy
8365                                  */
8366                                 /*
8367                                  * Add an AUTH chunk, if chunk requires it
8368                                  * save the offset into the chain for AUTH
8369                                  */
8370                                 if ((auth == NULL) &&
8371                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8372                                     stcb->asoc.peer_auth_chunks))) {
8373                                         outchain = sctp_add_auth_chunk(outchain,
8374                                             &endoutchain,
8375                                             &auth,
8376                                             &auth_offset,
8377                                             stcb,
8378                                             chk->rec.chunk_id.id);
8379                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8380                                 }
8381                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8382                                     (int)chk->rec.chunk_id.can_take_data,
8383                                     chk->send_size, chk->copy_by_ref);
8384                                 if (outchain == NULL) {
8385                                         *reason_code = 8;
8386                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8387                                         return (ENOMEM);
8388                                 }
8389                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8390                                 /* update our MTU size */
8391                                 if (mtu > (chk->send_size + omtu))
8392                                         mtu -= (chk->send_size + omtu);
8393                                 else
8394                                         mtu = 0;
8395                                 to_out += (chk->send_size + omtu);
8396                                 /* Do clear IP_DF ? */
8397                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8398                                         no_fragmentflg = 0;
8399                                 }
8400                                 if (chk->rec.chunk_id.can_take_data)
8401                                         chk->data = NULL;
8402                                 /* Mark things to be removed, if needed */
8403                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8404                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8405                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8406                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8407                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8408                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8409                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8410                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8411                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8412                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8413                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8414                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8415                                                 hbflag = 1;
8416                                         }
8417                                         /* remove these chunks at the end */
8418                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8419                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8420                                                 /* turn off the timer */
8421                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8422                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8423                                                             inp, stcb, net,
8424                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8425                                                 }
8426                                         }
8427                                         ctl_cnt++;
8428                                 } else {
8429                                         /*
8430                                          * Other chunks, since they have
8431                                          * timers running (i.e. COOKIE) we
8432                                          * just "trust" that it gets sent or
8433                                          * retransmitted.
8434                                          */
8435                                         ctl_cnt++;
8436                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8437                                                 cookie = 1;
8438                                                 no_out_cnt = 1;
8439                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8440                                                 /*
8441                                                  * Increment ecne send count
8442                                                  * here this means we may be
8443                                                  * over-zealous in our
8444                                                  * counting if the send
8445                                                  * fails, but its the best
8446                                                  * place to do it (we used
8447                                                  * to do it in the queue of
8448                                                  * the chunk, but that did
8449                                                  * not tell how many times
8450                                                  * it was sent.
8451                                                  */
8452                                                 SCTP_STAT_INCR(sctps_sendecne);
8453                                         }
8454                                         chk->sent = SCTP_DATAGRAM_SENT;
8455                                         if (chk->whoTo == NULL) {
8456                                                 chk->whoTo = net;
8457                                                 atomic_add_int(&net->ref_count, 1);
8458                                         }
8459                                         chk->snd_count++;
8460                                 }
8461                                 if (mtu == 0) {
8462                                         /*
8463                                          * Ok we are out of room but we can
8464                                          * output without effecting the
8465                                          * flight size since this little guy
8466                                          * is a control only packet.
8467                                          */
8468                                         if (asconf) {
8469                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8470                                                 /*
8471                                                  * do NOT clear the asconf
8472                                                  * flag as it is used to do
8473                                                  * appropriate source
8474                                                  * address selection.
8475                                                  */
8476                                         }
8477                                         if (cookie) {
8478                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8479                                                 cookie = 0;
8480                                         }
8481                                         /* Only HB or ASCONF advances time */
8482                                         if (hbflag) {
8483                                                 if (*now_filled == 0) {
8484                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8485                                                         *now_filled = 1;
8486                                                 }
8487                                                 net->last_sent_time = *now;
8488                                                 hbflag = 0;
8489                                         }
8490                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8491                                             (struct sockaddr *)&net->ro._l_addr,
8492                                             outchain,
8493                                             auth_offset, auth,
8494                                             stcb->asoc.authinfo.active_keyid,
8495                                             no_fragmentflg, 0, asconf,
8496                                             inp->sctp_lport, stcb->rport,
8497                                             htonl(stcb->asoc.peer_vtag),
8498                                             net->port, NULL,
8499                                             0, 0,
8500                                             so_locked))) {
8501                                                 /*
8502                                                  * error, we could not
8503                                                  * output
8504                                                  */
8505                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8506                                                 if (from_where == 0) {
8507                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8508                                                 }
8509                                                 if (error == ENOBUFS) {
8510                                                         asoc->ifp_had_enobuf = 1;
8511                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8512                                                 }
8513                                                 if (error == EHOSTUNREACH) {
8514                                                         /*
8515                                                          * Destination went
8516                                                          * unreachable
8517                                                          * during this send
8518                                                          */
8519                                                         sctp_move_chunks_from_net(stcb, net);
8520                                                 }
8521                                                 *reason_code = 7;
8522                                                 break;
8523                                         } else {
8524                                                 asoc->ifp_had_enobuf = 0;
8525                                         }
8526                                         /*
8527                                          * increase the number we sent, if a
8528                                          * cookie is sent we don't tell them
8529                                          * any was sent out.
8530                                          */
8531                                         outchain = endoutchain = NULL;
8532                                         auth = NULL;
8533                                         auth_offset = 0;
8534                                         if (!no_out_cnt)
8535                                                 *num_out += ctl_cnt;
8536                                         /* recalc a clean slate and setup */
8537                                         switch (net->ro._l_addr.sa.sa_family) {
8538 #ifdef INET
8539                                         case AF_INET:
8540                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8541                                                 break;
8542 #endif
8543 #ifdef INET6
8544                                         case AF_INET6:
8545                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8546                                                 break;
8547 #endif
8548                                         default:
8549                                                 /* TSNH */
8550                                                 mtu = net->mtu;
8551                                                 break;
8552                                         }
8553                                         to_out = 0;
8554                                         no_fragmentflg = 1;
8555                                 }
8556                         }
8557                 }
8558                 if (error != 0) {
8559                         /* try next net */
8560                         continue;
8561                 }
8562                 /* JRI: if dest is in PF state, do not send data to it */
8563                 if ((asoc->sctp_cmt_on_off > 0) &&
8564                     (net != stcb->asoc.alternate) &&
8565                     (net->dest_state & SCTP_ADDR_PF)) {
8566                         goto no_data_fill;
8567                 }
8568                 if (net->flight_size >= net->cwnd) {
8569                         goto no_data_fill;
8570                 }
8571                 if ((asoc->sctp_cmt_on_off > 0) &&
8572                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8573                     (net->flight_size > max_rwnd_per_dest)) {
8574                         goto no_data_fill;
8575                 }
8576                 /*
8577                  * We need a specific accounting for the usage of the send
8578                  * buffer. We also need to check the number of messages per
8579                  * net. For now, this is better than nothing and it disabled
8580                  * by default...
8581                  */
8582                 if ((asoc->sctp_cmt_on_off > 0) &&
8583                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8584                     (max_send_per_dest > 0) &&
8585                     (net->flight_size > max_send_per_dest)) {
8586                         goto no_data_fill;
8587                 }
8588                 /*********************/
8589                 /* Data transmission */
8590                 /*********************/
8591                 /*
8592                  * if AUTH for DATA is required and no AUTH has been added
8593                  * yet, account for this in the mtu now... if no data can be
8594                  * bundled, this adjustment won't matter anyways since the
8595                  * packet will be going out...
8596                  */
8597                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8598                     stcb->asoc.peer_auth_chunks);
8599                 if (data_auth_reqd && (auth == NULL)) {
8600                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8601                 }
8602                 /* now lets add any data within the MTU constraints */
8603                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8604 #ifdef INET
8605                 case AF_INET:
8606                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8607                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8608                         else
8609                                 omtu = 0;
8610                         break;
8611 #endif
8612 #ifdef INET6
8613                 case AF_INET6:
8614                         if (net->mtu > SCTP_MIN_OVERHEAD)
8615                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8616                         else
8617                                 omtu = 0;
8618                         break;
8619 #endif
8620                 default:
8621                         /* TSNH */
8622                         omtu = 0;
8623                         break;
8624                 }
8625                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8626                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8627                     (skip_data_for_this_net == 0)) ||
8628                     (cookie)) {
8629                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8630                                 if (no_data_chunks) {
8631                                         /* let only control go out */
8632                                         *reason_code = 1;
8633                                         break;
8634                                 }
8635                                 if (net->flight_size >= net->cwnd) {
8636                                         /* skip this net, no room for data */
8637                                         *reason_code = 2;
8638                                         break;
8639                                 }
8640                                 if ((chk->whoTo != NULL) &&
8641                                     (chk->whoTo != net)) {
8642                                         /* Don't send the chunk on this net */
8643                                         continue;
8644                                 }
8645
8646                                 if (asoc->sctp_cmt_on_off == 0) {
8647                                         if ((asoc->alternate) &&
8648                                             (asoc->alternate != net) &&
8649                                             (chk->whoTo == NULL)) {
8650                                                 continue;
8651                                         } else if ((net != asoc->primary_destination) &&
8652                                                     (asoc->alternate == NULL) &&
8653                                             (chk->whoTo == NULL)) {
8654                                                 continue;
8655                                         }
8656                                 }
8657                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8658                                         /*-
8659                                          * strange, we have a chunk that is
8660                                          * to big for its destination and
8661                                          * yet no fragment ok flag.
8662                                          * Something went wrong when the
8663                                          * PMTU changed...we did not mark
8664                                          * this chunk for some reason?? I
8665                                          * will fix it here by letting IP
8666                                          * fragment it for now and printing
8667                                          * a warning. This really should not
8668                                          * happen ...
8669                                          */
8670                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8671                                             chk->send_size, mtu);
8672                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8673                                 }
8674                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8675                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8676                                         struct sctp_data_chunk *dchkh;
8677
8678                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8679                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8680                                 }
8681                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8682                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8683                                         /* ok we will add this one */
8684
8685                                         /*
8686                                          * Add an AUTH chunk, if chunk
8687                                          * requires it, save the offset into
8688                                          * the chain for AUTH
8689                                          */
8690                                         if (data_auth_reqd) {
8691                                                 if (auth == NULL) {
8692                                                         outchain = sctp_add_auth_chunk(outchain,
8693                                                             &endoutchain,
8694                                                             &auth,
8695                                                             &auth_offset,
8696                                                             stcb,
8697                                                             SCTP_DATA);
8698                                                         auth_keyid = chk->auth_keyid;
8699                                                         override_ok = 0;
8700                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8701                                                 } else if (override_ok) {
8702                                                         /*
8703                                                          * use this data's
8704                                                          * keyid
8705                                                          */
8706                                                         auth_keyid = chk->auth_keyid;
8707                                                         override_ok = 0;
8708                                                 } else if (auth_keyid != chk->auth_keyid) {
8709                                                         /*
8710                                                          * different keyid,
8711                                                          * so done bundling
8712                                                          */
8713                                                         break;
8714                                                 }
8715                                         }
8716                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8717                                             chk->send_size, chk->copy_by_ref);
8718                                         if (outchain == NULL) {
8719                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8720                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8721                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8722                                                 }
8723                                                 *reason_code = 3;
8724                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8725                                                 return (ENOMEM);
8726                                         }
8727                                         /* upate our MTU size */
8728                                         /* Do clear IP_DF ? */
8729                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8730                                                 no_fragmentflg = 0;
8731                                         }
8732                                         /* unsigned subtraction of mtu */
8733                                         if (mtu > chk->send_size)
8734                                                 mtu -= chk->send_size;
8735                                         else
8736                                                 mtu = 0;
8737                                         /* unsigned subtraction of r_mtu */
8738                                         if (r_mtu > chk->send_size)
8739                                                 r_mtu -= chk->send_size;
8740                                         else
8741                                                 r_mtu = 0;
8742
8743                                         to_out += chk->send_size;
8744                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8745 #ifdef INVARIANTS
8746                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8747 #else
8748                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8749                                                     mx_mtu, to_out);
8750 #endif
8751                                         }
8752                                         chk->window_probe = 0;
8753                                         data_list[bundle_at++] = chk;
8754                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8755                                                 break;
8756                                         }
8757                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8758                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8759                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8760                                                 } else {
8761                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8762                                                 }
8763                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8764                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8765                                                         /*
8766                                                          * Count number of
8767                                                          * user msg's that
8768                                                          * were fragmented
8769                                                          * we do this by
8770                                                          * counting when we
8771                                                          * see a LAST
8772                                                          * fragment only.
8773                                                          */
8774                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8775                                         }
8776                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8777                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8778                                                         data_list[0]->window_probe = 1;
8779                                                         net->window_probe = 1;
8780                                                 }
8781                                                 break;
8782                                         }
8783                                 } else {
8784                                         /*
8785                                          * Must be sent in order of the
8786                                          * TSN's (on a network)
8787                                          */
8788                                         break;
8789                                 }
8790                         }       /* for (chunk gather loop for this net) */
8791                 }               /* if asoc.state OPEN */
8792 no_data_fill:
8793                 /* Is there something to send for this destination? */
8794                 if (outchain) {
8795                         /* We may need to start a control timer or two */
8796                         if (asconf) {
8797                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8798                                     stcb, net);
8799                                 /*
8800                                  * do NOT clear the asconf flag as it is
8801                                  * used to do appropriate source address
8802                                  * selection.
8803                                  */
8804                         }
8805                         if (cookie) {
8806                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8807                                 cookie = 0;
8808                         }
8809                         /* must start a send timer if data is being sent */
8810                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8811                                 /*
8812                                  * no timer running on this destination
8813                                  * restart it.
8814                                  */
8815                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8816                         }
8817                         if (bundle_at || hbflag) {
8818                                 /* For data/asconf and hb set time */
8819                                 if (*now_filled == 0) {
8820                                         (void)SCTP_GETTIME_TIMEVAL(now);
8821                                         *now_filled = 1;
8822                                 }
8823                                 net->last_sent_time = *now;
8824                         }
8825                         /* Now send it, if there is anything to send :> */
8826                         if ((error = sctp_lowlevel_chunk_output(inp,
8827                             stcb,
8828                             net,
8829                             (struct sockaddr *)&net->ro._l_addr,
8830                             outchain,
8831                             auth_offset,
8832                             auth,
8833                             auth_keyid,
8834                             no_fragmentflg,
8835                             bundle_at,
8836                             asconf,
8837                             inp->sctp_lport, stcb->rport,
8838                             htonl(stcb->asoc.peer_vtag),
8839                             net->port, NULL,
8840                             0, 0,
8841                             so_locked))) {
8842                                 /* error, we could not output */
8843                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8844                                 if (from_where == 0) {
8845                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8846                                 }
8847                                 if (error == ENOBUFS) {
8848                                         asoc->ifp_had_enobuf = 1;
8849                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8850                                 }
8851                                 if (error == EHOSTUNREACH) {
8852                                         /*
8853                                          * Destination went unreachable
8854                                          * during this send
8855                                          */
8856                                         sctp_move_chunks_from_net(stcb, net);
8857                                 }
8858                                 *reason_code = 6;
8859                                 /*-
8860                                  * I add this line to be paranoid. As far as
8861                                  * I can tell the continue, takes us back to
8862                                  * the top of the for, but just to make sure
8863                                  * I will reset these again here.
8864                                  */
8865                                 ctl_cnt = bundle_at = 0;
8866                                 continue;       /* This takes us back to the
8867                                                  * for() for the nets. */
8868                         } else {
8869                                 asoc->ifp_had_enobuf = 0;
8870                         }
8871                         endoutchain = NULL;
8872                         auth = NULL;
8873                         auth_offset = 0;
8874                         if (!no_out_cnt) {
8875                                 *num_out += (ctl_cnt + bundle_at);
8876                         }
8877                         if (bundle_at) {
8878                                 /* setup for a RTO measurement */
8879                                 tsns_sent = data_list[0]->rec.data.tsn;
8880                                 /* fill time if not already filled */
8881                                 if (*now_filled == 0) {
8882                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8883                                         *now_filled = 1;
8884                                         *now = asoc->time_last_sent;
8885                                 } else {
8886                                         asoc->time_last_sent = *now;
8887                                 }
8888                                 if (net->rto_needed) {
8889                                         data_list[0]->do_rtt = 1;
8890                                         net->rto_needed = 0;
8891                                 }
8892                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8893                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8894                         }
8895                         if (one_chunk) {
8896                                 break;
8897                         }
8898                 }
8899                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8900                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8901                 }
8902         }
8903         if (old_start_at == NULL) {
8904                 old_start_at = start_at;
8905                 start_at = TAILQ_FIRST(&asoc->nets);
8906                 if (old_start_at)
8907                         goto again_one_more_time;
8908         }
8909
8910         /*
8911          * At the end there should be no NON timed chunks hanging on this
8912          * queue.
8913          */
8914         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8915                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8916         }
8917         if ((*num_out == 0) && (*reason_code == 0)) {
8918                 *reason_code = 4;
8919         } else {
8920                 *reason_code = 5;
8921         }
8922         sctp_clean_up_ctl(stcb, asoc, so_locked);
8923         return (0);
8924 }
8925
8926 void
8927 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8928 {
8929         /*-
8930          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8931          * the control chunk queue.
8932          */
8933         struct sctp_chunkhdr *hdr;
8934         struct sctp_tmit_chunk *chk;
8935         struct mbuf *mat, *last_mbuf;
8936         uint32_t chunk_length;
8937         uint16_t padding_length;
8938
8939         SCTP_TCB_LOCK_ASSERT(stcb);
8940         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8941         if (op_err == NULL) {
8942                 return;
8943         }
8944         last_mbuf = NULL;
8945         chunk_length = 0;
8946         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8947                 chunk_length += SCTP_BUF_LEN(mat);
8948                 if (SCTP_BUF_NEXT(mat) == NULL) {
8949                         last_mbuf = mat;
8950                 }
8951         }
8952         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8953                 sctp_m_freem(op_err);
8954                 return;
8955         }
8956         padding_length = chunk_length % 4;
8957         if (padding_length != 0) {
8958                 padding_length = 4 - padding_length;
8959         }
8960         if (padding_length != 0) {
8961                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8962                         sctp_m_freem(op_err);
8963                         return;
8964                 }
8965         }
8966         sctp_alloc_a_chunk(stcb, chk);
8967         if (chk == NULL) {
8968                 /* no memory */
8969                 sctp_m_freem(op_err);
8970                 return;
8971         }
8972         chk->copy_by_ref = 0;
8973         chk->send_size = (uint16_t)chunk_length;
8974         chk->sent = SCTP_DATAGRAM_UNSENT;
8975         chk->snd_count = 0;
8976         chk->asoc = &stcb->asoc;
8977         chk->data = op_err;
8978         chk->whoTo = NULL;
8979         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8980         chk->rec.chunk_id.can_take_data = 0;
8981         hdr = mtod(op_err, struct sctp_chunkhdr *);
8982         hdr->chunk_type = SCTP_OPERATION_ERROR;
8983         hdr->chunk_flags = 0;
8984         hdr->chunk_length = htons(chk->send_size);
8985         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8986         chk->asoc->ctrl_queue_cnt++;
8987 }
8988
8989 int
8990 sctp_send_cookie_echo(struct mbuf *m,
8991     int offset,
8992     struct sctp_tcb *stcb,
8993     struct sctp_nets *net)
8994 {
8995         /*-
8996          * pull out the cookie and put it at the front of the control chunk
8997          * queue.
8998          */
8999         int at;
9000         struct mbuf *cookie;
9001         struct sctp_paramhdr param, *phdr;
9002         struct sctp_chunkhdr *hdr;
9003         struct sctp_tmit_chunk *chk;
9004         uint16_t ptype, plen;
9005
9006         SCTP_TCB_LOCK_ASSERT(stcb);
9007         /* First find the cookie in the param area */
9008         cookie = NULL;
9009         at = offset + sizeof(struct sctp_init_chunk);
9010         for (;;) {
9011                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9012                 if (phdr == NULL) {
9013                         return (-3);
9014                 }
9015                 ptype = ntohs(phdr->param_type);
9016                 plen = ntohs(phdr->param_length);
9017                 if (ptype == SCTP_STATE_COOKIE) {
9018                         int pad;
9019
9020                         /* found the cookie */
9021                         if ((pad = (plen % 4))) {
9022                                 plen += 4 - pad;
9023                         }
9024                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9025                         if (cookie == NULL) {
9026                                 /* No memory */
9027                                 return (-2);
9028                         }
9029 #ifdef SCTP_MBUF_LOGGING
9030                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9031                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9032                         }
9033 #endif
9034                         break;
9035                 }
9036                 at += SCTP_SIZE32(plen);
9037         }
9038         /* ok, we got the cookie lets change it into a cookie echo chunk */
9039         /* first the change from param to cookie */
9040         hdr = mtod(cookie, struct sctp_chunkhdr *);
9041         hdr->chunk_type = SCTP_COOKIE_ECHO;
9042         hdr->chunk_flags = 0;
9043         /* get the chunk stuff now and place it in the FRONT of the queue */
9044         sctp_alloc_a_chunk(stcb, chk);
9045         if (chk == NULL) {
9046                 /* no memory */
9047                 sctp_m_freem(cookie);
9048                 return (-5);
9049         }
9050         chk->copy_by_ref = 0;
9051         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9052         chk->rec.chunk_id.can_take_data = 0;
9053         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9054         chk->send_size = plen;
9055         chk->sent = SCTP_DATAGRAM_UNSENT;
9056         chk->snd_count = 0;
9057         chk->asoc = &stcb->asoc;
9058         chk->data = cookie;
9059         chk->whoTo = net;
9060         atomic_add_int(&chk->whoTo->ref_count, 1);
9061         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9062         chk->asoc->ctrl_queue_cnt++;
9063         return (0);
9064 }
9065
9066 void
9067 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9068     struct mbuf *m,
9069     int offset,
9070     int chk_length,
9071     struct sctp_nets *net)
9072 {
9073         /*
9074          * take a HB request and make it into a HB ack and send it.
9075          */
9076         struct mbuf *outchain;
9077         struct sctp_chunkhdr *chdr;
9078         struct sctp_tmit_chunk *chk;
9079
9080
9081         if (net == NULL)
9082                 /* must have a net pointer */
9083                 return;
9084
9085         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9086         if (outchain == NULL) {
9087                 /* gak out of memory */
9088                 return;
9089         }
9090 #ifdef SCTP_MBUF_LOGGING
9091         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9092                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9093         }
9094 #endif
9095         chdr = mtod(outchain, struct sctp_chunkhdr *);
9096         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9097         chdr->chunk_flags = 0;
9098         if (chk_length % 4) {
9099                 /* need pad */
9100                 uint32_t cpthis = 0;
9101                 int padlen;
9102
9103                 padlen = 4 - (chk_length % 4);
9104                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9105         }
9106         sctp_alloc_a_chunk(stcb, chk);
9107         if (chk == NULL) {
9108                 /* no memory */
9109                 sctp_m_freem(outchain);
9110                 return;
9111         }
9112         chk->copy_by_ref = 0;
9113         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9114         chk->rec.chunk_id.can_take_data = 1;
9115         chk->flags = 0;
9116         chk->send_size = chk_length;
9117         chk->sent = SCTP_DATAGRAM_UNSENT;
9118         chk->snd_count = 0;
9119         chk->asoc = &stcb->asoc;
9120         chk->data = outchain;
9121         chk->whoTo = net;
9122         atomic_add_int(&chk->whoTo->ref_count, 1);
9123         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9124         chk->asoc->ctrl_queue_cnt++;
9125 }
9126
9127 void
9128 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9129 {
9130         /* formulate and queue a cookie-ack back to sender */
9131         struct mbuf *cookie_ack;
9132         struct sctp_chunkhdr *hdr;
9133         struct sctp_tmit_chunk *chk;
9134
9135         SCTP_TCB_LOCK_ASSERT(stcb);
9136
9137         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9138         if (cookie_ack == NULL) {
9139                 /* no mbuf's */
9140                 return;
9141         }
9142         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9143         sctp_alloc_a_chunk(stcb, chk);
9144         if (chk == NULL) {
9145                 /* no memory */
9146                 sctp_m_freem(cookie_ack);
9147                 return;
9148         }
9149         chk->copy_by_ref = 0;
9150         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9151         chk->rec.chunk_id.can_take_data = 1;
9152         chk->flags = 0;
9153         chk->send_size = sizeof(struct sctp_chunkhdr);
9154         chk->sent = SCTP_DATAGRAM_UNSENT;
9155         chk->snd_count = 0;
9156         chk->asoc = &stcb->asoc;
9157         chk->data = cookie_ack;
9158         if (chk->asoc->last_control_chunk_from != NULL) {
9159                 chk->whoTo = chk->asoc->last_control_chunk_from;
9160                 atomic_add_int(&chk->whoTo->ref_count, 1);
9161         } else {
9162                 chk->whoTo = NULL;
9163         }
9164         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9165         hdr->chunk_type = SCTP_COOKIE_ACK;
9166         hdr->chunk_flags = 0;
9167         hdr->chunk_length = htons(chk->send_size);
9168         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9169         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9170         chk->asoc->ctrl_queue_cnt++;
9171         return;
9172 }
9173
9174
9175 void
9176 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9177 {
9178         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9179         struct mbuf *m_shutdown_ack;
9180         struct sctp_shutdown_ack_chunk *ack_cp;
9181         struct sctp_tmit_chunk *chk;
9182
9183         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9184         if (m_shutdown_ack == NULL) {
9185                 /* no mbuf's */
9186                 return;
9187         }
9188         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9189         sctp_alloc_a_chunk(stcb, chk);
9190         if (chk == NULL) {
9191                 /* no memory */
9192                 sctp_m_freem(m_shutdown_ack);
9193                 return;
9194         }
9195         chk->copy_by_ref = 0;
9196         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9197         chk->rec.chunk_id.can_take_data = 1;
9198         chk->flags = 0;
9199         chk->send_size = sizeof(struct sctp_chunkhdr);
9200         chk->sent = SCTP_DATAGRAM_UNSENT;
9201         chk->snd_count = 0;
9202         chk->flags = 0;
9203         chk->asoc = &stcb->asoc;
9204         chk->data = m_shutdown_ack;
9205         chk->whoTo = net;
9206         if (chk->whoTo) {
9207                 atomic_add_int(&chk->whoTo->ref_count, 1);
9208         }
9209         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9210         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9211         ack_cp->ch.chunk_flags = 0;
9212         ack_cp->ch.chunk_length = htons(chk->send_size);
9213         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9214         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9215         chk->asoc->ctrl_queue_cnt++;
9216         return;
9217 }
9218
9219 void
9220 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9221 {
9222         /* formulate and queue a SHUTDOWN to the sender */
9223         struct mbuf *m_shutdown;
9224         struct sctp_shutdown_chunk *shutdown_cp;
9225         struct sctp_tmit_chunk *chk;
9226
9227         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9228                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9229                         /* We already have a SHUTDOWN queued. Reuse it. */
9230                         if (chk->whoTo) {
9231                                 sctp_free_remote_addr(chk->whoTo);
9232                                 chk->whoTo = NULL;
9233                         }
9234                         break;
9235                 }
9236         }
9237         if (chk == NULL) {
9238                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9239                 if (m_shutdown == NULL) {
9240                         /* no mbuf's */
9241                         return;
9242                 }
9243                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9244                 sctp_alloc_a_chunk(stcb, chk);
9245                 if (chk == NULL) {
9246                         /* no memory */
9247                         sctp_m_freem(m_shutdown);
9248                         return;
9249                 }
9250                 chk->copy_by_ref = 0;
9251                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9252                 chk->rec.chunk_id.can_take_data = 1;
9253                 chk->flags = 0;
9254                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9255                 chk->sent = SCTP_DATAGRAM_UNSENT;
9256                 chk->snd_count = 0;
9257                 chk->flags = 0;
9258                 chk->asoc = &stcb->asoc;
9259                 chk->data = m_shutdown;
9260                 chk->whoTo = net;
9261                 if (chk->whoTo) {
9262                         atomic_add_int(&chk->whoTo->ref_count, 1);
9263                 }
9264                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9265                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9266                 shutdown_cp->ch.chunk_flags = 0;
9267                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9268                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9269                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9270                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9271                 chk->asoc->ctrl_queue_cnt++;
9272         } else {
9273                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9274                 chk->whoTo = net;
9275                 if (chk->whoTo) {
9276                         atomic_add_int(&chk->whoTo->ref_count, 1);
9277                 }
9278                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9279                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9280                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9281         }
9282         return;
9283 }
9284
9285 void
9286 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9287 {
9288         /*
9289          * formulate and queue an ASCONF to the peer. ASCONF parameters
9290          * should be queued on the assoc queue.
9291          */
9292         struct sctp_tmit_chunk *chk;
9293         struct mbuf *m_asconf;
9294         int len;
9295
9296         SCTP_TCB_LOCK_ASSERT(stcb);
9297
9298         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9299             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9300                 /* can't send a new one if there is one in flight already */
9301                 return;
9302         }
9303
9304         /* compose an ASCONF chunk, maximum length is PMTU */
9305         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9306         if (m_asconf == NULL) {
9307                 return;
9308         }
9309
9310         sctp_alloc_a_chunk(stcb, chk);
9311         if (chk == NULL) {
9312                 /* no memory */
9313                 sctp_m_freem(m_asconf);
9314                 return;
9315         }
9316
9317         chk->copy_by_ref = 0;
9318         chk->rec.chunk_id.id = SCTP_ASCONF;
9319         chk->rec.chunk_id.can_take_data = 0;
9320         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9321         chk->data = m_asconf;
9322         chk->send_size = len;
9323         chk->sent = SCTP_DATAGRAM_UNSENT;
9324         chk->snd_count = 0;
9325         chk->asoc = &stcb->asoc;
9326         chk->whoTo = net;
9327         if (chk->whoTo) {
9328                 atomic_add_int(&chk->whoTo->ref_count, 1);
9329         }
9330         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9331         chk->asoc->ctrl_queue_cnt++;
9332         return;
9333 }
9334
9335 void
9336 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9337 {
9338         /*
9339          * formulate and queue a asconf-ack back to sender. the asconf-ack
9340          * must be stored in the tcb.
9341          */
9342         struct sctp_tmit_chunk *chk;
9343         struct sctp_asconf_ack *ack, *latest_ack;
9344         struct mbuf *m_ack;
9345         struct sctp_nets *net = NULL;
9346
9347         SCTP_TCB_LOCK_ASSERT(stcb);
9348         /* Get the latest ASCONF-ACK */
9349         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9350         if (latest_ack == NULL) {
9351                 return;
9352         }
9353         if (latest_ack->last_sent_to != NULL &&
9354             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9355                 /* we're doing a retransmission */
9356                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9357                 if (net == NULL) {
9358                         /* no alternate */
9359                         if (stcb->asoc.last_control_chunk_from == NULL) {
9360                                 if (stcb->asoc.alternate) {
9361                                         net = stcb->asoc.alternate;
9362                                 } else {
9363                                         net = stcb->asoc.primary_destination;
9364                                 }
9365                         } else {
9366                                 net = stcb->asoc.last_control_chunk_from;
9367                         }
9368                 }
9369         } else {
9370                 /* normal case */
9371                 if (stcb->asoc.last_control_chunk_from == NULL) {
9372                         if (stcb->asoc.alternate) {
9373                                 net = stcb->asoc.alternate;
9374                         } else {
9375                                 net = stcb->asoc.primary_destination;
9376                         }
9377                 } else {
9378                         net = stcb->asoc.last_control_chunk_from;
9379                 }
9380         }
9381         latest_ack->last_sent_to = net;
9382
9383         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9384                 if (ack->data == NULL) {
9385                         continue;
9386                 }
9387
9388                 /* copy the asconf_ack */
9389                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9390                 if (m_ack == NULL) {
9391                         /* couldn't copy it */
9392                         return;
9393                 }
9394 #ifdef SCTP_MBUF_LOGGING
9395                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9396                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9397                 }
9398 #endif
9399
9400                 sctp_alloc_a_chunk(stcb, chk);
9401                 if (chk == NULL) {
9402                         /* no memory */
9403                         if (m_ack)
9404                                 sctp_m_freem(m_ack);
9405                         return;
9406                 }
9407                 chk->copy_by_ref = 0;
9408                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9409                 chk->rec.chunk_id.can_take_data = 1;
9410                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9411                 chk->whoTo = net;
9412                 if (chk->whoTo) {
9413                         atomic_add_int(&chk->whoTo->ref_count, 1);
9414                 }
9415                 chk->data = m_ack;
9416                 chk->send_size = ack->len;
9417                 chk->sent = SCTP_DATAGRAM_UNSENT;
9418                 chk->snd_count = 0;
9419                 chk->asoc = &stcb->asoc;
9420
9421                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9422                 chk->asoc->ctrl_queue_cnt++;
9423         }
9424         return;
9425 }
9426
9427
9428 static int
9429 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9430     struct sctp_tcb *stcb,
9431     struct sctp_association *asoc,
9432     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9433 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9434     SCTP_UNUSED
9435 #endif
9436 )
9437 {
9438         /*-
9439          * send out one MTU of retransmission. If fast_retransmit is
9440          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9441          * rwnd. For a Cookie or Asconf in the control chunk queue we
9442          * retransmit them by themselves.
9443          *
9444          * For data chunks we will pick out the lowest TSN's in the sent_queue
9445          * marked for resend and bundle them all together (up to a MTU of
9446          * destination). The address to send to should have been
9447          * selected/changed where the retransmission was marked (i.e. in FR
9448          * or t3-timeout routines).
9449          */
9450         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9451         struct sctp_tmit_chunk *chk, *fwd;
9452         struct mbuf *m, *endofchain;
9453         struct sctp_nets *net = NULL;
9454         uint32_t tsns_sent = 0;
9455         int no_fragmentflg, bundle_at, cnt_thru;
9456         unsigned int mtu;
9457         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9458         struct sctp_auth_chunk *auth = NULL;
9459         uint32_t auth_offset = 0;
9460         uint16_t auth_keyid;
9461         int override_ok = 1;
9462         int data_auth_reqd = 0;
9463         uint32_t dmtu = 0;
9464
9465         SCTP_TCB_LOCK_ASSERT(stcb);
9466         tmr_started = ctl_cnt = bundle_at = error = 0;
9467         no_fragmentflg = 1;
9468         fwd_tsn = 0;
9469         *cnt_out = 0;
9470         fwd = NULL;
9471         endofchain = m = NULL;
9472         auth_keyid = stcb->asoc.authinfo.active_keyid;
9473 #ifdef SCTP_AUDITING_ENABLED
9474         sctp_audit_log(0xC3, 1);
9475 #endif
9476         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9477             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9478                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9479                     asoc->sent_queue_retran_cnt);
9480                 asoc->sent_queue_cnt = 0;
9481                 asoc->sent_queue_cnt_removeable = 0;
9482                 /* send back 0/0 so we enter normal transmission */
9483                 *cnt_out = 0;
9484                 return (0);
9485         }
9486         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9487                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9488                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9489                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9490                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9491                                 continue;
9492                         }
9493                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9494                                 if (chk != asoc->str_reset) {
9495                                         /*
9496                                          * not eligible for retran if its
9497                                          * not ours
9498                                          */
9499                                         continue;
9500                                 }
9501                         }
9502                         ctl_cnt++;
9503                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9504                                 fwd_tsn = 1;
9505                         }
9506                         /*
9507                          * Add an AUTH chunk, if chunk requires it save the
9508                          * offset into the chain for AUTH
9509                          */
9510                         if ((auth == NULL) &&
9511                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9512                             stcb->asoc.peer_auth_chunks))) {
9513                                 m = sctp_add_auth_chunk(m, &endofchain,
9514                                     &auth, &auth_offset,
9515                                     stcb,
9516                                     chk->rec.chunk_id.id);
9517                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9518                         }
9519                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9520                         break;
9521                 }
9522         }
9523         one_chunk = 0;
9524         cnt_thru = 0;
9525         /* do we have control chunks to retransmit? */
9526         if (m != NULL) {
9527                 /* Start a timer no matter if we succeed or fail */
9528                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9529                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9530                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9531                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9532                 chk->snd_count++;       /* update our count */
9533                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9534                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9535                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9536                     no_fragmentflg, 0, 0,
9537                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9538                     chk->whoTo->port, NULL,
9539                     0, 0,
9540                     so_locked))) {
9541                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9542                         if (error == ENOBUFS) {
9543                                 asoc->ifp_had_enobuf = 1;
9544                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9545                         }
9546                         return (error);
9547                 } else {
9548                         asoc->ifp_had_enobuf = 0;
9549                 }
9550                 endofchain = NULL;
9551                 auth = NULL;
9552                 auth_offset = 0;
9553                 /*
9554                  * We don't want to mark the net->sent time here since this
9555                  * we use this for HB and retrans cannot measure RTT
9556                  */
9557                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9558                 *cnt_out += 1;
9559                 chk->sent = SCTP_DATAGRAM_SENT;
9560                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9561                 if (fwd_tsn == 0) {
9562                         return (0);
9563                 } else {
9564                         /* Clean up the fwd-tsn list */
9565                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9566                         return (0);
9567                 }
9568         }
9569         /*
9570          * Ok, it is just data retransmission we need to do or that and a
9571          * fwd-tsn with it all.
9572          */
9573         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9574                 return (SCTP_RETRAN_DONE);
9575         }
9576         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9577             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9578                 /* not yet open, resend the cookie and that is it */
9579                 return (1);
9580         }
9581 #ifdef SCTP_AUDITING_ENABLED
9582         sctp_auditing(20, inp, stcb, NULL);
9583 #endif
9584         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9585         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9586                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9587                         /* No, not sent to this net or not ready for rtx */
9588                         continue;
9589                 }
9590                 if (chk->data == NULL) {
9591                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9592                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9593                         continue;
9594                 }
9595                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9596                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9597                         struct mbuf *op_err;
9598                         char msg[SCTP_DIAG_INFO_LEN];
9599
9600                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9601                             chk->rec.data.tsn, chk->snd_count);
9602                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9603                             msg);
9604                         atomic_add_int(&stcb->asoc.refcnt, 1);
9605                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9606                             so_locked);
9607                         SCTP_TCB_LOCK(stcb);
9608                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9609                         return (SCTP_RETRAN_EXIT);
9610                 }
9611                 /* pick up the net */
9612                 net = chk->whoTo;
9613                 switch (net->ro._l_addr.sa.sa_family) {
9614 #ifdef INET
9615                 case AF_INET:
9616                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9617                         break;
9618 #endif
9619 #ifdef INET6
9620                 case AF_INET6:
9621                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9622                         break;
9623 #endif
9624                 default:
9625                         /* TSNH */
9626                         mtu = net->mtu;
9627                         break;
9628                 }
9629
9630                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9631                         /* No room in peers rwnd */
9632                         uint32_t tsn;
9633
9634                         tsn = asoc->last_acked_seq + 1;
9635                         if (tsn == chk->rec.data.tsn) {
9636                                 /*
9637                                  * we make a special exception for this
9638                                  * case. The peer has no rwnd but is missing
9639                                  * the lowest chunk.. which is probably what
9640                                  * is holding up the rwnd.
9641                                  */
9642                                 goto one_chunk_around;
9643                         }
9644                         return (1);
9645                 }
9646 one_chunk_around:
9647                 if (asoc->peers_rwnd < mtu) {
9648                         one_chunk = 1;
9649                         if ((asoc->peers_rwnd == 0) &&
9650                             (asoc->total_flight == 0)) {
9651                                 chk->window_probe = 1;
9652                                 chk->whoTo->window_probe = 1;
9653                         }
9654                 }
9655 #ifdef SCTP_AUDITING_ENABLED
9656                 sctp_audit_log(0xC3, 2);
9657 #endif
9658                 bundle_at = 0;
9659                 m = NULL;
9660                 net->fast_retran_ip = 0;
9661                 if (chk->rec.data.doing_fast_retransmit == 0) {
9662                         /*
9663                          * if no FR in progress skip destination that have
9664                          * flight_size > cwnd.
9665                          */
9666                         if (net->flight_size >= net->cwnd) {
9667                                 continue;
9668                         }
9669                 } else {
9670                         /*
9671                          * Mark the destination net to have FR recovery
9672                          * limits put on it.
9673                          */
9674                         *fr_done = 1;
9675                         net->fast_retran_ip = 1;
9676                 }
9677
9678                 /*
9679                  * if no AUTH is yet included and this chunk requires it,
9680                  * make sure to account for it.  We don't apply the size
9681                  * until the AUTH chunk is actually added below in case
9682                  * there is no room for this chunk.
9683                  */
9684                 if (data_auth_reqd && (auth == NULL)) {
9685                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9686                 } else
9687                         dmtu = 0;
9688
9689                 if ((chk->send_size <= (mtu - dmtu)) ||
9690                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9691                         /* ok we will add this one */
9692                         if (data_auth_reqd) {
9693                                 if (auth == NULL) {
9694                                         m = sctp_add_auth_chunk(m,
9695                                             &endofchain,
9696                                             &auth,
9697                                             &auth_offset,
9698                                             stcb,
9699                                             SCTP_DATA);
9700                                         auth_keyid = chk->auth_keyid;
9701                                         override_ok = 0;
9702                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9703                                 } else if (override_ok) {
9704                                         auth_keyid = chk->auth_keyid;
9705                                         override_ok = 0;
9706                                 } else if (chk->auth_keyid != auth_keyid) {
9707                                         /* different keyid, so done bundling */
9708                                         break;
9709                                 }
9710                         }
9711                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9712                         if (m == NULL) {
9713                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9714                                 return (ENOMEM);
9715                         }
9716                         /* Do clear IP_DF ? */
9717                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9718                                 no_fragmentflg = 0;
9719                         }
9720                         /* upate our MTU size */
9721                         if (mtu > (chk->send_size + dmtu))
9722                                 mtu -= (chk->send_size + dmtu);
9723                         else
9724                                 mtu = 0;
9725                         data_list[bundle_at++] = chk;
9726                         if (one_chunk && (asoc->total_flight <= 0)) {
9727                                 SCTP_STAT_INCR(sctps_windowprobed);
9728                         }
9729                 }
9730                 if (one_chunk == 0) {
9731                         /*
9732                          * now are there anymore forward from chk to pick
9733                          * up?
9734                          */
9735                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9736                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9737                                         /* Nope, not for retran */
9738                                         continue;
9739                                 }
9740                                 if (fwd->whoTo != net) {
9741                                         /* Nope, not the net in question */
9742                                         continue;
9743                                 }
9744                                 if (data_auth_reqd && (auth == NULL)) {
9745                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9746                                 } else
9747                                         dmtu = 0;
9748                                 if (fwd->send_size <= (mtu - dmtu)) {
9749                                         if (data_auth_reqd) {
9750                                                 if (auth == NULL) {
9751                                                         m = sctp_add_auth_chunk(m,
9752                                                             &endofchain,
9753                                                             &auth,
9754                                                             &auth_offset,
9755                                                             stcb,
9756                                                             SCTP_DATA);
9757                                                         auth_keyid = fwd->auth_keyid;
9758                                                         override_ok = 0;
9759                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9760                                                 } else if (override_ok) {
9761                                                         auth_keyid = fwd->auth_keyid;
9762                                                         override_ok = 0;
9763                                                 } else if (fwd->auth_keyid != auth_keyid) {
9764                                                         /*
9765                                                          * different keyid,
9766                                                          * so done bundling
9767                                                          */
9768                                                         break;
9769                                                 }
9770                                         }
9771                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9772                                         if (m == NULL) {
9773                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9774                                                 return (ENOMEM);
9775                                         }
9776                                         /* Do clear IP_DF ? */
9777                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9778                                                 no_fragmentflg = 0;
9779                                         }
9780                                         /* upate our MTU size */
9781                                         if (mtu > (fwd->send_size + dmtu))
9782                                                 mtu -= (fwd->send_size + dmtu);
9783                                         else
9784                                                 mtu = 0;
9785                                         data_list[bundle_at++] = fwd;
9786                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9787                                                 break;
9788                                         }
9789                                 } else {
9790                                         /* can't fit so we are done */
9791                                         break;
9792                                 }
9793                         }
9794                 }
9795                 /* Is there something to send for this destination? */
9796                 if (m) {
9797                         /*
9798                          * No matter if we fail/or succeed we should start a
9799                          * timer. A failure is like a lost IP packet :-)
9800                          */
9801                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9802                                 /*
9803                                  * no timer running on this destination
9804                                  * restart it.
9805                                  */
9806                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9807                                 tmr_started = 1;
9808                         }
9809                         /* Now lets send it, if there is anything to send :> */
9810                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9811                             (struct sockaddr *)&net->ro._l_addr, m,
9812                             auth_offset, auth, auth_keyid,
9813                             no_fragmentflg, 0, 0,
9814                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9815                             net->port, NULL,
9816                             0, 0,
9817                             so_locked))) {
9818                                 /* error, we could not output */
9819                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9820                                 if (error == ENOBUFS) {
9821                                         asoc->ifp_had_enobuf = 1;
9822                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9823                                 }
9824                                 return (error);
9825                         } else {
9826                                 asoc->ifp_had_enobuf = 0;
9827                         }
9828                         endofchain = NULL;
9829                         auth = NULL;
9830                         auth_offset = 0;
9831                         /* For HB's */
9832                         /*
9833                          * We don't want to mark the net->sent time here
9834                          * since this we use this for HB and retrans cannot
9835                          * measure RTT
9836                          */
9837                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9838
9839                         /* For auto-close */
9840                         cnt_thru++;
9841                         if (*now_filled == 0) {
9842                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9843                                 *now = asoc->time_last_sent;
9844                                 *now_filled = 1;
9845                         } else {
9846                                 asoc->time_last_sent = *now;
9847                         }
9848                         *cnt_out += bundle_at;
9849 #ifdef SCTP_AUDITING_ENABLED
9850                         sctp_audit_log(0xC4, bundle_at);
9851 #endif
9852                         if (bundle_at) {
9853                                 tsns_sent = data_list[0]->rec.data.tsn;
9854                         }
9855                         for (i = 0; i < bundle_at; i++) {
9856                                 SCTP_STAT_INCR(sctps_sendretransdata);
9857                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9858                                 /*
9859                                  * When we have a revoked data, and we
9860                                  * retransmit it, then we clear the revoked
9861                                  * flag since this flag dictates if we
9862                                  * subtracted from the fs
9863                                  */
9864                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9865                                         /* Deflate the cwnd */
9866                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9867                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9868                                 }
9869                                 data_list[i]->snd_count++;
9870                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9871                                 /* record the time */
9872                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9873                                 if (data_list[i]->book_size_scale) {
9874                                         /*
9875                                          * need to double the book size on
9876                                          * this one
9877                                          */
9878                                         data_list[i]->book_size_scale = 0;
9879                                         /*
9880                                          * Since we double the booksize, we
9881                                          * must also double the output queue
9882                                          * size, since this get shrunk when
9883                                          * we free by this amount.
9884                                          */
9885                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9886                                         data_list[i]->book_size *= 2;
9887
9888
9889                                 } else {
9890                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9891                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9892                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9893                                         }
9894                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9895                                             (uint32_t)(data_list[i]->send_size +
9896                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9897                                 }
9898                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9899                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9900                                             data_list[i]->whoTo->flight_size,
9901                                             data_list[i]->book_size,
9902                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9903                                             data_list[i]->rec.data.tsn);
9904                                 }
9905                                 sctp_flight_size_increase(data_list[i]);
9906                                 sctp_total_flight_increase(stcb, data_list[i]);
9907                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9908                                         /* SWS sender side engages */
9909                                         asoc->peers_rwnd = 0;
9910                                 }
9911                                 if ((i == 0) &&
9912                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9913                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9914                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9915                                             (tmr_started == 0)) {
9916                                                 /*-
9917                                                  * ok we just fast-retrans'd
9918                                                  * the lowest TSN, i.e the
9919                                                  * first on the list. In
9920                                                  * this case we want to give
9921                                                  * some more time to get a
9922                                                  * SACK back without a
9923                                                  * t3-expiring.
9924                                                  */
9925                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9926                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9927                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9928                                         }
9929                                 }
9930                         }
9931                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9932                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9933                         }
9934 #ifdef SCTP_AUDITING_ENABLED
9935                         sctp_auditing(21, inp, stcb, NULL);
9936 #endif
9937                 } else {
9938                         /* None will fit */
9939                         return (1);
9940                 }
9941                 if (asoc->sent_queue_retran_cnt <= 0) {
9942                         /* all done we have no more to retran */
9943                         asoc->sent_queue_retran_cnt = 0;
9944                         break;
9945                 }
9946                 if (one_chunk) {
9947                         /* No more room in rwnd */
9948                         return (1);
9949                 }
9950                 /* stop the for loop here. we sent out a packet */
9951                 break;
9952         }
9953         return (0);
9954 }
9955
9956 static void
9957 sctp_timer_validation(struct sctp_inpcb *inp,
9958     struct sctp_tcb *stcb,
9959     struct sctp_association *asoc)
9960 {
9961         struct sctp_nets *net;
9962
9963         /* Validate that a timer is running somewhere */
9964         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9965                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9966                         /* Here is a timer */
9967                         return;
9968                 }
9969         }
9970         SCTP_TCB_LOCK_ASSERT(stcb);
9971         /* Gak, we did not have a timer somewhere */
9972         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9973         if (asoc->alternate) {
9974                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9975         } else {
9976                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9977         }
9978         return;
9979 }
9980
9981 void
9982 sctp_chunk_output(struct sctp_inpcb *inp,
9983     struct sctp_tcb *stcb,
9984     int from_where,
9985     int so_locked
9986 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9987     SCTP_UNUSED
9988 #endif
9989 )
9990 {
9991         /*-
9992          * Ok this is the generic chunk service queue. we must do the
9993          * following:
9994          * - See if there are retransmits pending, if so we must
9995          *   do these first.
9996          * - Service the stream queue that is next, moving any
9997          *   message (note I must get a complete message i.e.
9998          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9999          *   TSN's
10000          * - Check to see if the cwnd/rwnd allows any output, if so we
10001          *   go ahead and fomulate and send the low level chunks. Making sure
10002          *   to combine any control in the control chunk queue also.
10003          */
10004         struct sctp_association *asoc;
10005         struct sctp_nets *net;
10006         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10007         unsigned int burst_cnt = 0;
10008         struct timeval now;
10009         int now_filled = 0;
10010         int nagle_on;
10011         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10012         int un_sent = 0;
10013         int fr_done;
10014         unsigned int tot_frs = 0;
10015
10016         asoc = &stcb->asoc;
10017 do_it_again:
10018         /* The Nagle algorithm is only applied when handling a send call. */
10019         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10020                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10021                         nagle_on = 0;
10022                 } else {
10023                         nagle_on = 1;
10024                 }
10025         } else {
10026                 nagle_on = 0;
10027         }
10028         SCTP_TCB_LOCK_ASSERT(stcb);
10029
10030         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10031
10032         if ((un_sent <= 0) &&
10033             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10034             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10035             (asoc->sent_queue_retran_cnt == 0) &&
10036             (asoc->trigger_reset == 0)) {
10037                 /* Nothing to do unless there is something to be sent left */
10038                 return;
10039         }
10040         /*
10041          * Do we have something to send, data or control AND a sack timer
10042          * running, if so piggy-back the sack.
10043          */
10044         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10045                 sctp_send_sack(stcb, so_locked);
10046                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10047         }
10048         while (asoc->sent_queue_retran_cnt) {
10049                 /*-
10050                  * Ok, it is retransmission time only, we send out only ONE
10051                  * packet with a single call off to the retran code.
10052                  */
10053                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10054                         /*-
10055                          * Special hook for handling cookiess discarded
10056                          * by peer that carried data. Send cookie-ack only
10057                          * and then the next call with get the retran's.
10058                          */
10059                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10060                             from_where,
10061                             &now, &now_filled, frag_point, so_locked);
10062                         return;
10063                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10064                         /* if its not from a HB then do it */
10065                         fr_done = 0;
10066                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10067                         if (fr_done) {
10068                                 tot_frs++;
10069                         }
10070                 } else {
10071                         /*
10072                          * its from any other place, we don't allow retran
10073                          * output (only control)
10074                          */
10075                         ret = 1;
10076                 }
10077                 if (ret > 0) {
10078                         /* Can't send anymore */
10079                         /*-
10080                          * now lets push out control by calling med-level
10081                          * output once. this assures that we WILL send HB's
10082                          * if queued too.
10083                          */
10084                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10085                             from_where,
10086                             &now, &now_filled, frag_point, so_locked);
10087 #ifdef SCTP_AUDITING_ENABLED
10088                         sctp_auditing(8, inp, stcb, NULL);
10089 #endif
10090                         sctp_timer_validation(inp, stcb, asoc);
10091                         return;
10092                 }
10093                 if (ret < 0) {
10094                         /*-
10095                          * The count was off.. retran is not happening so do
10096                          * the normal retransmission.
10097                          */
10098 #ifdef SCTP_AUDITING_ENABLED
10099                         sctp_auditing(9, inp, stcb, NULL);
10100 #endif
10101                         if (ret == SCTP_RETRAN_EXIT) {
10102                                 return;
10103                         }
10104                         break;
10105                 }
10106                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10107                         /* Only one transmission allowed out of a timeout */
10108 #ifdef SCTP_AUDITING_ENABLED
10109                         sctp_auditing(10, inp, stcb, NULL);
10110 #endif
10111                         /* Push out any control */
10112                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10113                             &now, &now_filled, frag_point, so_locked);
10114                         return;
10115                 }
10116                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10117                         /* Hit FR burst limit */
10118                         return;
10119                 }
10120                 if ((num_out == 0) && (ret == 0)) {
10121                         /* No more retrans to send */
10122                         break;
10123                 }
10124         }
10125 #ifdef SCTP_AUDITING_ENABLED
10126         sctp_auditing(12, inp, stcb, NULL);
10127 #endif
10128         /* Check for bad destinations, if they exist move chunks around. */
10129         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10130                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10131                         /*-
10132                          * if possible move things off of this address we
10133                          * still may send below due to the dormant state but
10134                          * we try to find an alternate address to send to
10135                          * and if we have one we move all queued data on the
10136                          * out wheel to this alternate address.
10137                          */
10138                         if (net->ref_count > 1)
10139                                 sctp_move_chunks_from_net(stcb, net);
10140                 } else {
10141                         /*-
10142                          * if ((asoc->sat_network) || (net->addr_is_local))
10143                          * { burst_limit = asoc->max_burst *
10144                          * SCTP_SAT_NETWORK_BURST_INCR; }
10145                          */
10146                         if (asoc->max_burst > 0) {
10147                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10148                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10149                                                 /*
10150                                                  * JRS - Use the congestion
10151                                                  * control given in the
10152                                                  * congestion control module
10153                                                  */
10154                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10155                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10156                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10157                                                 }
10158                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10159                                         }
10160                                         net->fast_retran_ip = 0;
10161                                 } else {
10162                                         if (net->flight_size == 0) {
10163                                                 /*
10164                                                  * Should be decaying the
10165                                                  * cwnd here
10166                                                  */
10167                                                 ;
10168                                         }
10169                                 }
10170                         }
10171                 }
10172
10173         }
10174         burst_cnt = 0;
10175         do {
10176                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10177                     &reason_code, 0, from_where,
10178                     &now, &now_filled, frag_point, so_locked);
10179                 if (error) {
10180                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10181                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10182                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10183                         }
10184                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10185                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10186                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10187                         }
10188                         break;
10189                 }
10190                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10191
10192                 tot_out += num_out;
10193                 burst_cnt++;
10194                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10195                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10196                         if (num_out == 0) {
10197                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10198                         }
10199                 }
10200                 if (nagle_on) {
10201                         /*
10202                          * When the Nagle algorithm is used, look at how
10203                          * much is unsent, then if its smaller than an MTU
10204                          * and we have data in flight we stop, except if we
10205                          * are handling a fragmented user message.
10206                          */
10207                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10208                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10209                             (stcb->asoc.total_flight > 0)) {
10210 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10211                                 break;
10212                         }
10213                 }
10214                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10215                     TAILQ_EMPTY(&asoc->send_queue) &&
10216                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10217                         /* Nothing left to send */
10218                         break;
10219                 }
10220                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10221                         /* Nothing left to send */
10222                         break;
10223                 }
10224         } while (num_out &&
10225             ((asoc->max_burst == 0) ||
10226             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10227             (burst_cnt < asoc->max_burst)));
10228
10229         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10230                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10231                         SCTP_STAT_INCR(sctps_maxburstqueued);
10232                         asoc->burst_limit_applied = 1;
10233                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10234                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10235                         }
10236                 } else {
10237                         asoc->burst_limit_applied = 0;
10238                 }
10239         }
10240         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10241                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10242         }
10243         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10244             tot_out);
10245
10246         /*-
10247          * Now we need to clean up the control chunk chain if a ECNE is on
10248          * it. It must be marked as UNSENT again so next call will continue
10249          * to send it until such time that we get a CWR, to remove it.
10250          */
10251         if (stcb->asoc.ecn_echo_cnt_onq)
10252                 sctp_fix_ecn_echo(asoc);
10253
10254         if (stcb->asoc.trigger_reset) {
10255                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10256                         goto do_it_again;
10257                 }
10258         }
10259         return;
10260 }
10261
10262
10263 int
10264 sctp_output(
10265     struct sctp_inpcb *inp,
10266     struct mbuf *m,
10267     struct sockaddr *addr,
10268     struct mbuf *control,
10269     struct thread *p,
10270     int flags)
10271 {
10272         if (inp == NULL) {
10273                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10274                 return (EINVAL);
10275         }
10276
10277         if (inp->sctp_socket == NULL) {
10278                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10279                 return (EINVAL);
10280         }
10281         return (sctp_sosend(inp->sctp_socket,
10282             addr,
10283             (struct uio *)NULL,
10284             m,
10285             control,
10286             flags, p
10287             ));
10288 }
10289
10290 void
10291 send_forward_tsn(struct sctp_tcb *stcb,
10292     struct sctp_association *asoc)
10293 {
10294         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10295         struct sctp_forward_tsn_chunk *fwdtsn;
10296         struct sctp_strseq *strseq;
10297         struct sctp_strseq_mid *strseq_m;
10298         uint32_t advance_peer_ack_point;
10299         unsigned int cnt_of_space, i, ovh;
10300         unsigned int space_needed;
10301         unsigned int cnt_of_skipped = 0;
10302
10303         SCTP_TCB_LOCK_ASSERT(stcb);
10304         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10305                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10306                         /* mark it to unsent */
10307                         chk->sent = SCTP_DATAGRAM_UNSENT;
10308                         chk->snd_count = 0;
10309                         /* Do we correct its output location? */
10310                         if (chk->whoTo) {
10311                                 sctp_free_remote_addr(chk->whoTo);
10312                                 chk->whoTo = NULL;
10313                         }
10314                         goto sctp_fill_in_rest;
10315                 }
10316         }
10317         /* Ok if we reach here we must build one */
10318         sctp_alloc_a_chunk(stcb, chk);
10319         if (chk == NULL) {
10320                 return;
10321         }
10322         asoc->fwd_tsn_cnt++;
10323         chk->copy_by_ref = 0;
10324         /*
10325          * We don't do the old thing here since this is used not for on-wire
10326          * but to tell if we are sending a fwd-tsn by the stack during
10327          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10328          */
10329         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10330         chk->rec.chunk_id.can_take_data = 0;
10331         chk->flags = 0;
10332         chk->asoc = asoc;
10333         chk->whoTo = NULL;
10334         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10335         if (chk->data == NULL) {
10336                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10337                 return;
10338         }
10339         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10340         chk->sent = SCTP_DATAGRAM_UNSENT;
10341         chk->snd_count = 0;
10342         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10343         asoc->ctrl_queue_cnt++;
10344 sctp_fill_in_rest:
10345         /*-
10346          * Here we go through and fill out the part that deals with
10347          * stream/seq of the ones we skip.
10348          */
10349         SCTP_BUF_LEN(chk->data) = 0;
10350         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10351                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10352                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10353                         /* no more to look at */
10354                         break;
10355                 }
10356                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10357                         /* We don't report these */
10358                         continue;
10359                 }
10360                 cnt_of_skipped++;
10361         }
10362         if (asoc->idata_supported) {
10363                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10364                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10365         } else {
10366                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10367                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10368         }
10369         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10370
10371         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10372                 ovh = SCTP_MIN_OVERHEAD;
10373         } else {
10374                 ovh = SCTP_MIN_V4_OVERHEAD;
10375         }
10376         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10377                 /* trim to a mtu size */
10378                 cnt_of_space = asoc->smallest_mtu - ovh;
10379         }
10380         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10381                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10382                     0xff, 0, cnt_of_skipped,
10383                     asoc->advanced_peer_ack_point);
10384         }
10385         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10386         if (cnt_of_space < space_needed) {
10387                 /*-
10388                  * ok we must trim down the chunk by lowering the
10389                  * advance peer ack point.
10390                  */
10391                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10392                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10393                             0xff, 0xff, cnt_of_space,
10394                             space_needed);
10395                 }
10396                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10397                 if (asoc->idata_supported) {
10398                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10399                 } else {
10400                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10401                 }
10402                 /*-
10403                  * Go through and find the TSN that will be the one
10404                  * we report.
10405                  */
10406                 at = TAILQ_FIRST(&asoc->sent_queue);
10407                 if (at != NULL) {
10408                         for (i = 0; i < cnt_of_skipped; i++) {
10409                                 tp1 = TAILQ_NEXT(at, sctp_next);
10410                                 if (tp1 == NULL) {
10411                                         break;
10412                                 }
10413                                 at = tp1;
10414                         }
10415                 }
10416                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10417                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10418                             0xff, cnt_of_skipped, at->rec.data.tsn,
10419                             asoc->advanced_peer_ack_point);
10420                 }
10421                 last = at;
10422                 /*-
10423                  * last now points to last one I can report, update
10424                  * peer ack point
10425                  */
10426                 if (last) {
10427                         advance_peer_ack_point = last->rec.data.tsn;
10428                 }
10429                 if (asoc->idata_supported) {
10430                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10431                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10432                 } else {
10433                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10434                             cnt_of_skipped * sizeof(struct sctp_strseq);
10435                 }
10436         }
10437         chk->send_size = space_needed;
10438         /* Setup the chunk */
10439         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10440         fwdtsn->ch.chunk_length = htons(chk->send_size);
10441         fwdtsn->ch.chunk_flags = 0;
10442         if (asoc->idata_supported) {
10443                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10444         } else {
10445                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10446         }
10447         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10448         SCTP_BUF_LEN(chk->data) = chk->send_size;
10449         fwdtsn++;
10450         /*-
10451          * Move pointer to after the fwdtsn and transfer to the
10452          * strseq pointer.
10453          */
10454         if (asoc->idata_supported) {
10455                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10456                 strseq = NULL;
10457         } else {
10458                 strseq = (struct sctp_strseq *)fwdtsn;
10459                 strseq_m = NULL;
10460         }
10461         /*-
10462          * Now populate the strseq list. This is done blindly
10463          * without pulling out duplicate stream info. This is
10464          * inefficent but won't harm the process since the peer will
10465          * look at these in sequence and will thus release anything.
10466          * It could mean we exceed the PMTU and chop off some that
10467          * we could have included.. but this is unlikely (aka 1432/4
10468          * would mean 300+ stream seq's would have to be reported in
10469          * one FWD-TSN. With a bit of work we can later FIX this to
10470          * optimize and pull out duplicates.. but it does add more
10471          * overhead. So for now... not!
10472          */
10473         i = 0;
10474         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10475                 if (i >= cnt_of_skipped) {
10476                         break;
10477                 }
10478                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10479                         /* We don't report these */
10480                         continue;
10481                 }
10482                 if (at->rec.data.tsn == advance_peer_ack_point) {
10483                         at->rec.data.fwd_tsn_cnt = 0;
10484                 }
10485                 if (asoc->idata_supported) {
10486                         strseq_m->sid = htons(at->rec.data.sid);
10487                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10488                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10489                         } else {
10490                                 strseq_m->flags = 0;
10491                         }
10492                         strseq_m->mid = htonl(at->rec.data.mid);
10493                         strseq_m++;
10494                 } else {
10495                         strseq->sid = htons(at->rec.data.sid);
10496                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10497                         strseq++;
10498                 }
10499                 i++;
10500         }
10501         return;
10502 }
10503
10504 void
10505 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10506 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10507     SCTP_UNUSED
10508 #endif
10509 )
10510 {
10511         /*-
10512          * Queue up a SACK or NR-SACK in the control queue.
10513          * We must first check to see if a SACK or NR-SACK is
10514          * somehow on the control queue.
10515          * If so, we will take and and remove the old one.
10516          */
10517         struct sctp_association *asoc;
10518         struct sctp_tmit_chunk *chk, *a_chk;
10519         struct sctp_sack_chunk *sack;
10520         struct sctp_nr_sack_chunk *nr_sack;
10521         struct sctp_gap_ack_block *gap_descriptor;
10522         const struct sack_track *selector;
10523         int mergeable = 0;
10524         int offset;
10525         caddr_t limit;
10526         uint32_t *dup;
10527         int limit_reached = 0;
10528         unsigned int i, siz, j;
10529         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10530         int num_dups = 0;
10531         int space_req;
10532         uint32_t highest_tsn;
10533         uint8_t flags;
10534         uint8_t type;
10535         uint8_t tsn_map;
10536
10537         if (stcb->asoc.nrsack_supported == 1) {
10538                 type = SCTP_NR_SELECTIVE_ACK;
10539         } else {
10540                 type = SCTP_SELECTIVE_ACK;
10541         }
10542         a_chk = NULL;
10543         asoc = &stcb->asoc;
10544         SCTP_TCB_LOCK_ASSERT(stcb);
10545         if (asoc->last_data_chunk_from == NULL) {
10546                 /* Hmm we never received anything */
10547                 return;
10548         }
10549         sctp_slide_mapping_arrays(stcb);
10550         sctp_set_rwnd(stcb, asoc);
10551         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10552                 if (chk->rec.chunk_id.id == type) {
10553                         /* Hmm, found a sack already on queue, remove it */
10554                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10555                         asoc->ctrl_queue_cnt--;
10556                         a_chk = chk;
10557                         if (a_chk->data) {
10558                                 sctp_m_freem(a_chk->data);
10559                                 a_chk->data = NULL;
10560                         }
10561                         if (a_chk->whoTo) {
10562                                 sctp_free_remote_addr(a_chk->whoTo);
10563                                 a_chk->whoTo = NULL;
10564                         }
10565                         break;
10566                 }
10567         }
10568         if (a_chk == NULL) {
10569                 sctp_alloc_a_chunk(stcb, a_chk);
10570                 if (a_chk == NULL) {
10571                         /* No memory so we drop the idea, and set a timer */
10572                         if (stcb->asoc.delayed_ack) {
10573                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10574                                     stcb->sctp_ep, stcb, NULL,
10575                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10576                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10577                                     stcb->sctp_ep, stcb, NULL);
10578                         } else {
10579                                 stcb->asoc.send_sack = 1;
10580                         }
10581                         return;
10582                 }
10583                 a_chk->copy_by_ref = 0;
10584                 a_chk->rec.chunk_id.id = type;
10585                 a_chk->rec.chunk_id.can_take_data = 1;
10586         }
10587         /* Clear our pkt counts */
10588         asoc->data_pkts_seen = 0;
10589
10590         a_chk->flags = 0;
10591         a_chk->asoc = asoc;
10592         a_chk->snd_count = 0;
10593         a_chk->send_size = 0;   /* fill in later */
10594         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10595         a_chk->whoTo = NULL;
10596
10597         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10598                 /*-
10599                  * Ok, the destination for the SACK is unreachable, lets see if
10600                  * we can select an alternate to asoc->last_data_chunk_from
10601                  */
10602                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10603                 if (a_chk->whoTo == NULL) {
10604                         /* Nope, no alternate */
10605                         a_chk->whoTo = asoc->last_data_chunk_from;
10606                 }
10607         } else {
10608                 a_chk->whoTo = asoc->last_data_chunk_from;
10609         }
10610         if (a_chk->whoTo) {
10611                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10612         }
10613         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10614                 highest_tsn = asoc->highest_tsn_inside_map;
10615         } else {
10616                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10617         }
10618         if (highest_tsn == asoc->cumulative_tsn) {
10619                 /* no gaps */
10620                 if (type == SCTP_SELECTIVE_ACK) {
10621                         space_req = sizeof(struct sctp_sack_chunk);
10622                 } else {
10623                         space_req = sizeof(struct sctp_nr_sack_chunk);
10624                 }
10625         } else {
10626                 /* gaps get a cluster */
10627                 space_req = MCLBYTES;
10628         }
10629         /* Ok now lets formulate a MBUF with our sack */
10630         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10631         if ((a_chk->data == NULL) ||
10632             (a_chk->whoTo == NULL)) {
10633                 /* rats, no mbuf memory */
10634                 if (a_chk->data) {
10635                         /* was a problem with the destination */
10636                         sctp_m_freem(a_chk->data);
10637                         a_chk->data = NULL;
10638                 }
10639                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10640                 /* sa_ignore NO_NULL_CHK */
10641                 if (stcb->asoc.delayed_ack) {
10642                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10643                             stcb->sctp_ep, stcb, NULL,
10644                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10645                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10646                             stcb->sctp_ep, stcb, NULL);
10647                 } else {
10648                         stcb->asoc.send_sack = 1;
10649                 }
10650                 return;
10651         }
10652         /* ok, lets go through and fill it in */
10653         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10654         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10655         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10656                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10657         }
10658         limit = mtod(a_chk->data, caddr_t);
10659         limit += space;
10660
10661         flags = 0;
10662
10663         if ((asoc->sctp_cmt_on_off > 0) &&
10664             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10665                 /*-
10666                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10667                  * received, then set high bit to 1, else 0. Reset
10668                  * pkts_rcvd.
10669                  */
10670                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10671                 asoc->cmt_dac_pkts_rcvd = 0;
10672         }
10673 #ifdef SCTP_ASOCLOG_OF_TSNS
10674         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10675         stcb->asoc.cumack_log_atsnt++;
10676         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10677                 stcb->asoc.cumack_log_atsnt = 0;
10678         }
10679 #endif
10680         /* reset the readers interpretation */
10681         stcb->freed_by_sorcv_sincelast = 0;
10682
10683         if (type == SCTP_SELECTIVE_ACK) {
10684                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10685                 nr_sack = NULL;
10686                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10687                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10688                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10689                 } else {
10690                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10691                 }
10692         } else {
10693                 sack = NULL;
10694                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10695                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10696                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10697                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10698                 } else {
10699                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10700                 }
10701         }
10702
10703         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10704                 offset = 1;
10705         } else {
10706                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10707         }
10708         if (((type == SCTP_SELECTIVE_ACK) &&
10709             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10710             ((type == SCTP_NR_SELECTIVE_ACK) &&
10711             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10712                 /* we have a gap .. maybe */
10713                 for (i = 0; i < siz; i++) {
10714                         tsn_map = asoc->mapping_array[i];
10715                         if (type == SCTP_SELECTIVE_ACK) {
10716                                 tsn_map |= asoc->nr_mapping_array[i];
10717                         }
10718                         if (i == 0) {
10719                                 /*
10720                                  * Clear all bits corresponding to TSNs
10721                                  * smaller or equal to the cumulative TSN.
10722                                  */
10723                                 tsn_map &= (~0U << (1 - offset));
10724                         }
10725                         selector = &sack_array[tsn_map];
10726                         if (mergeable && selector->right_edge) {
10727                                 /*
10728                                  * Backup, left and right edges were ok to
10729                                  * merge.
10730                                  */
10731                                 num_gap_blocks--;
10732                                 gap_descriptor--;
10733                         }
10734                         if (selector->num_entries == 0)
10735                                 mergeable = 0;
10736                         else {
10737                                 for (j = 0; j < selector->num_entries; j++) {
10738                                         if (mergeable && selector->right_edge) {
10739                                                 /*
10740                                                  * do a merge by NOT setting
10741                                                  * the left side
10742                                                  */
10743                                                 mergeable = 0;
10744                                         } else {
10745                                                 /*
10746                                                  * no merge, set the left
10747                                                  * side
10748                                                  */
10749                                                 mergeable = 0;
10750                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10751                                         }
10752                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10753                                         num_gap_blocks++;
10754                                         gap_descriptor++;
10755                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10756                                                 /* no more room */
10757                                                 limit_reached = 1;
10758                                                 break;
10759                                         }
10760                                 }
10761                                 if (selector->left_edge) {
10762                                         mergeable = 1;
10763                                 }
10764                         }
10765                         if (limit_reached) {
10766                                 /* Reached the limit stop */
10767                                 break;
10768                         }
10769                         offset += 8;
10770                 }
10771         }
10772         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10773             (limit_reached == 0)) {
10774
10775                 mergeable = 0;
10776
10777                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10778                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10779                 } else {
10780                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10781                 }
10782
10783                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10784                         offset = 1;
10785                 } else {
10786                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10787                 }
10788                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10789                         /* we have a gap .. maybe */
10790                         for (i = 0; i < siz; i++) {
10791                                 tsn_map = asoc->nr_mapping_array[i];
10792                                 if (i == 0) {
10793                                         /*
10794                                          * Clear all bits corresponding to
10795                                          * TSNs smaller or equal to the
10796                                          * cumulative TSN.
10797                                          */
10798                                         tsn_map &= (~0U << (1 - offset));
10799                                 }
10800                                 selector = &sack_array[tsn_map];
10801                                 if (mergeable && selector->right_edge) {
10802                                         /*
10803                                          * Backup, left and right edges were
10804                                          * ok to merge.
10805                                          */
10806                                         num_nr_gap_blocks--;
10807                                         gap_descriptor--;
10808                                 }
10809                                 if (selector->num_entries == 0)
10810                                         mergeable = 0;
10811                                 else {
10812                                         for (j = 0; j < selector->num_entries; j++) {
10813                                                 if (mergeable && selector->right_edge) {
10814                                                         /*
10815                                                          * do a merge by NOT
10816                                                          * setting the left
10817                                                          * side
10818                                                          */
10819                                                         mergeable = 0;
10820                                                 } else {
10821                                                         /*
10822                                                          * no merge, set the
10823                                                          * left side
10824                                                          */
10825                                                         mergeable = 0;
10826                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10827                                                 }
10828                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10829                                                 num_nr_gap_blocks++;
10830                                                 gap_descriptor++;
10831                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10832                                                         /* no more room */
10833                                                         limit_reached = 1;
10834                                                         break;
10835                                                 }
10836                                         }
10837                                         if (selector->left_edge) {
10838                                                 mergeable = 1;
10839                                         }
10840                                 }
10841                                 if (limit_reached) {
10842                                         /* Reached the limit stop */
10843                                         break;
10844                                 }
10845                                 offset += 8;
10846                         }
10847                 }
10848         }
10849         /* now we must add any dups we are going to report. */
10850         if ((limit_reached == 0) && (asoc->numduptsns)) {
10851                 dup = (uint32_t *)gap_descriptor;
10852                 for (i = 0; i < asoc->numduptsns; i++) {
10853                         *dup = htonl(asoc->dup_tsns[i]);
10854                         dup++;
10855                         num_dups++;
10856                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10857                                 /* no more room */
10858                                 break;
10859                         }
10860                 }
10861                 asoc->numduptsns = 0;
10862         }
10863         /*
10864          * now that the chunk is prepared queue it to the control chunk
10865          * queue.
10866          */
10867         if (type == SCTP_SELECTIVE_ACK) {
10868                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10869                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10870                     num_dups * sizeof(int32_t));
10871                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10872                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10873                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10874                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10875                 sack->sack.num_dup_tsns = htons(num_dups);
10876                 sack->ch.chunk_type = type;
10877                 sack->ch.chunk_flags = flags;
10878                 sack->ch.chunk_length = htons(a_chk->send_size);
10879         } else {
10880                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10881                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10882                     num_dups * sizeof(int32_t));
10883                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10884                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10885                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10886                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10887                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10888                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10889                 nr_sack->nr_sack.reserved = 0;
10890                 nr_sack->ch.chunk_type = type;
10891                 nr_sack->ch.chunk_flags = flags;
10892                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10893         }
10894         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10895         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10896         asoc->ctrl_queue_cnt++;
10897         asoc->send_sack = 0;
10898         SCTP_STAT_INCR(sctps_sendsacks);
10899         return;
10900 }
10901
10902 void
10903 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10904 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10905     SCTP_UNUSED
10906 #endif
10907 )
10908 {
10909         struct mbuf *m_abort, *m, *m_last;
10910         struct mbuf *m_out, *m_end = NULL;
10911         struct sctp_abort_chunk *abort;
10912         struct sctp_auth_chunk *auth = NULL;
10913         struct sctp_nets *net;
10914         uint32_t vtag;
10915         uint32_t auth_offset = 0;
10916         int error;
10917         uint16_t cause_len, chunk_len, padding_len;
10918
10919         SCTP_TCB_LOCK_ASSERT(stcb);
10920         /*-
10921          * Add an AUTH chunk, if chunk requires it and save the offset into
10922          * the chain for AUTH
10923          */
10924         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10925             stcb->asoc.peer_auth_chunks)) {
10926                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10927                     stcb, SCTP_ABORT_ASSOCIATION);
10928                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10929         } else {
10930                 m_out = NULL;
10931         }
10932         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10933         if (m_abort == NULL) {
10934                 if (m_out) {
10935                         sctp_m_freem(m_out);
10936                 }
10937                 if (operr) {
10938                         sctp_m_freem(operr);
10939                 }
10940                 return;
10941         }
10942         /* link in any error */
10943         SCTP_BUF_NEXT(m_abort) = operr;
10944         cause_len = 0;
10945         m_last = NULL;
10946         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10947                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10948                 if (SCTP_BUF_NEXT(m) == NULL) {
10949                         m_last = m;
10950                 }
10951         }
10952         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10953         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10954         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10955         if (m_out == NULL) {
10956                 /* NO Auth chunk prepended, so reserve space in front */
10957                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10958                 m_out = m_abort;
10959         } else {
10960                 /* Put AUTH chunk at the front of the chain */
10961                 SCTP_BUF_NEXT(m_end) = m_abort;
10962         }
10963         if (stcb->asoc.alternate) {
10964                 net = stcb->asoc.alternate;
10965         } else {
10966                 net = stcb->asoc.primary_destination;
10967         }
10968         /* Fill in the ABORT chunk header. */
10969         abort = mtod(m_abort, struct sctp_abort_chunk *);
10970         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10971         if (stcb->asoc.peer_vtag == 0) {
10972                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10973                 vtag = stcb->asoc.my_vtag;
10974                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10975         } else {
10976                 vtag = stcb->asoc.peer_vtag;
10977                 abort->ch.chunk_flags = 0;
10978         }
10979         abort->ch.chunk_length = htons(chunk_len);
10980         /* Add padding, if necessary. */
10981         if (padding_len > 0) {
10982                 if ((m_last == NULL) ||
10983                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10984                         sctp_m_freem(m_out);
10985                         return;
10986                 }
10987         }
10988         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10989             (struct sockaddr *)&net->ro._l_addr,
10990             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10991             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10992             stcb->asoc.primary_destination->port, NULL,
10993             0, 0,
10994             so_locked))) {
10995                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10996                 if (error == ENOBUFS) {
10997                         stcb->asoc.ifp_had_enobuf = 1;
10998                         SCTP_STAT_INCR(sctps_lowlevelerr);
10999                 }
11000         } else {
11001                 stcb->asoc.ifp_had_enobuf = 0;
11002         }
11003         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11004 }
11005
11006 void
11007 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11008     struct sctp_nets *net,
11009     int reflect_vtag)
11010 {
11011         /* formulate and SEND a SHUTDOWN-COMPLETE */
11012         struct mbuf *m_shutdown_comp;
11013         struct sctp_shutdown_complete_chunk *shutdown_complete;
11014         uint32_t vtag;
11015         int error;
11016         uint8_t flags;
11017
11018         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11019         if (m_shutdown_comp == NULL) {
11020                 /* no mbuf's */
11021                 return;
11022         }
11023         if (reflect_vtag) {
11024                 flags = SCTP_HAD_NO_TCB;
11025                 vtag = stcb->asoc.my_vtag;
11026         } else {
11027                 flags = 0;
11028                 vtag = stcb->asoc.peer_vtag;
11029         }
11030         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11031         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11032         shutdown_complete->ch.chunk_flags = flags;
11033         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11034         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11035         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11036             (struct sockaddr *)&net->ro._l_addr,
11037             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11038             stcb->sctp_ep->sctp_lport, stcb->rport,
11039             htonl(vtag),
11040             net->port, NULL,
11041             0, 0,
11042             SCTP_SO_NOT_LOCKED))) {
11043                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11044                 if (error == ENOBUFS) {
11045                         stcb->asoc.ifp_had_enobuf = 1;
11046                         SCTP_STAT_INCR(sctps_lowlevelerr);
11047                 }
11048         } else {
11049                 stcb->asoc.ifp_had_enobuf = 0;
11050         }
11051         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11052         return;
11053 }
11054
11055 static void
11056 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11057     struct sctphdr *sh, uint32_t vtag,
11058     uint8_t type, struct mbuf *cause,
11059     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11060     uint32_t vrf_id, uint16_t port)
11061 {
11062         struct mbuf *o_pak;
11063         struct mbuf *mout;
11064         struct sctphdr *shout;
11065         struct sctp_chunkhdr *ch;
11066 #if defined(INET) || defined(INET6)
11067         struct udphdr *udp;
11068 #endif
11069         int ret, len, cause_len, padding_len;
11070 #ifdef INET
11071         struct sockaddr_in *src_sin, *dst_sin;
11072         struct ip *ip;
11073 #endif
11074 #ifdef INET6
11075         struct sockaddr_in6 *src_sin6, *dst_sin6;
11076         struct ip6_hdr *ip6;
11077 #endif
11078
11079         /* Compute the length of the cause and add final padding. */
11080         cause_len = 0;
11081         if (cause != NULL) {
11082                 struct mbuf *m_at, *m_last = NULL;
11083
11084                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11085                         if (SCTP_BUF_NEXT(m_at) == NULL)
11086                                 m_last = m_at;
11087                         cause_len += SCTP_BUF_LEN(m_at);
11088                 }
11089                 padding_len = cause_len % 4;
11090                 if (padding_len != 0) {
11091                         padding_len = 4 - padding_len;
11092                 }
11093                 if (padding_len != 0) {
11094                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11095                                 sctp_m_freem(cause);
11096                                 return;
11097                         }
11098                 }
11099         } else {
11100                 padding_len = 0;
11101         }
11102         /* Get an mbuf for the header. */
11103         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11104         switch (dst->sa_family) {
11105 #ifdef INET
11106         case AF_INET:
11107                 len += sizeof(struct ip);
11108                 break;
11109 #endif
11110 #ifdef INET6
11111         case AF_INET6:
11112                 len += sizeof(struct ip6_hdr);
11113                 break;
11114 #endif
11115         default:
11116                 break;
11117         }
11118 #if defined(INET) || defined(INET6)
11119         if (port) {
11120                 len += sizeof(struct udphdr);
11121         }
11122 #endif
11123         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11124         if (mout == NULL) {
11125                 if (cause) {
11126                         sctp_m_freem(cause);
11127                 }
11128                 return;
11129         }
11130         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11131         SCTP_BUF_LEN(mout) = len;
11132         SCTP_BUF_NEXT(mout) = cause;
11133         M_SETFIB(mout, fibnum);
11134         mout->m_pkthdr.flowid = mflowid;
11135         M_HASHTYPE_SET(mout, mflowtype);
11136 #ifdef INET
11137         ip = NULL;
11138 #endif
11139 #ifdef INET6
11140         ip6 = NULL;
11141 #endif
11142         switch (dst->sa_family) {
11143 #ifdef INET
11144         case AF_INET:
11145                 src_sin = (struct sockaddr_in *)src;
11146                 dst_sin = (struct sockaddr_in *)dst;
11147                 ip = mtod(mout, struct ip *);
11148                 ip->ip_v = IPVERSION;
11149                 ip->ip_hl = (sizeof(struct ip) >> 2);
11150                 ip->ip_tos = 0;
11151                 ip->ip_off = htons(IP_DF);
11152                 ip_fillid(ip);
11153                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11154                 if (port) {
11155                         ip->ip_p = IPPROTO_UDP;
11156                 } else {
11157                         ip->ip_p = IPPROTO_SCTP;
11158                 }
11159                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11160                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11161                 ip->ip_sum = 0;
11162                 len = sizeof(struct ip);
11163                 shout = (struct sctphdr *)((caddr_t)ip + len);
11164                 break;
11165 #endif
11166 #ifdef INET6
11167         case AF_INET6:
11168                 src_sin6 = (struct sockaddr_in6 *)src;
11169                 dst_sin6 = (struct sockaddr_in6 *)dst;
11170                 ip6 = mtod(mout, struct ip6_hdr *);
11171                 ip6->ip6_flow = htonl(0x60000000);
11172                 if (V_ip6_auto_flowlabel) {
11173                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11174                 }
11175                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11176                 if (port) {
11177                         ip6->ip6_nxt = IPPROTO_UDP;
11178                 } else {
11179                         ip6->ip6_nxt = IPPROTO_SCTP;
11180                 }
11181                 ip6->ip6_src = dst_sin6->sin6_addr;
11182                 ip6->ip6_dst = src_sin6->sin6_addr;
11183                 len = sizeof(struct ip6_hdr);
11184                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11185                 break;
11186 #endif
11187         default:
11188                 len = 0;
11189                 shout = mtod(mout, struct sctphdr *);
11190                 break;
11191         }
11192 #if defined(INET) || defined(INET6)
11193         if (port) {
11194                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11195                         sctp_m_freem(mout);
11196                         return;
11197                 }
11198                 udp = (struct udphdr *)shout;
11199                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11200                 udp->uh_dport = port;
11201                 udp->uh_sum = 0;
11202                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11203                     sizeof(struct sctphdr) +
11204                     sizeof(struct sctp_chunkhdr) +
11205                     cause_len + padding_len));
11206                 len += sizeof(struct udphdr);
11207                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11208         } else {
11209                 udp = NULL;
11210         }
11211 #endif
11212         shout->src_port = sh->dest_port;
11213         shout->dest_port = sh->src_port;
11214         shout->checksum = 0;
11215         if (vtag) {
11216                 shout->v_tag = htonl(vtag);
11217         } else {
11218                 shout->v_tag = sh->v_tag;
11219         }
11220         len += sizeof(struct sctphdr);
11221         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11222         ch->chunk_type = type;
11223         if (vtag) {
11224                 ch->chunk_flags = 0;
11225         } else {
11226                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11227         }
11228         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11229         len += sizeof(struct sctp_chunkhdr);
11230         len += cause_len + padding_len;
11231
11232         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11233                 sctp_m_freem(mout);
11234                 return;
11235         }
11236         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11237         switch (dst->sa_family) {
11238 #ifdef INET
11239         case AF_INET:
11240                 if (port) {
11241                         if (V_udp_cksum) {
11242                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11243                         } else {
11244                                 udp->uh_sum = 0;
11245                         }
11246                 }
11247                 ip->ip_len = htons(len);
11248                 if (port) {
11249                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11250                         SCTP_STAT_INCR(sctps_sendswcrc);
11251                         if (V_udp_cksum) {
11252                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11253                         }
11254                 } else {
11255                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11256                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11257                         SCTP_STAT_INCR(sctps_sendhwcrc);
11258                 }
11259 #ifdef SCTP_PACKET_LOGGING
11260                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11261                         sctp_packet_log(o_pak);
11262                 }
11263 #endif
11264                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11265                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11266                 break;
11267 #endif
11268 #ifdef INET6
11269         case AF_INET6:
11270                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11271                 if (port) {
11272                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11273                         SCTP_STAT_INCR(sctps_sendswcrc);
11274                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11275                                 udp->uh_sum = 0xffff;
11276                         }
11277                 } else {
11278                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11279                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11280                         SCTP_STAT_INCR(sctps_sendhwcrc);
11281                 }
11282 #ifdef SCTP_PACKET_LOGGING
11283                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11284                         sctp_packet_log(o_pak);
11285                 }
11286 #endif
11287                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11288                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11289                 break;
11290 #endif
11291         default:
11292                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11293                     dst->sa_family);
11294                 sctp_m_freem(mout);
11295                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11296                 return;
11297         }
11298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11299         if (port) {
11300                 UDPSTAT_INC(udps_opackets);
11301         }
11302         SCTP_STAT_INCR(sctps_sendpackets);
11303         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11304         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11305         if (ret) {
11306                 SCTP_STAT_INCR(sctps_senderrors);
11307         }
11308         return;
11309 }
11310
11311 void
11312 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11313     struct sctphdr *sh,
11314     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11315     uint32_t vrf_id, uint16_t port)
11316 {
11317         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11318             mflowtype, mflowid, fibnum,
11319             vrf_id, port);
11320 }
11321
11322 void
11323 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11324 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11325     SCTP_UNUSED
11326 #endif
11327 )
11328 {
11329         struct sctp_tmit_chunk *chk;
11330         struct sctp_heartbeat_chunk *hb;
11331         struct timeval now;
11332
11333         SCTP_TCB_LOCK_ASSERT(stcb);
11334         if (net == NULL) {
11335                 return;
11336         }
11337         (void)SCTP_GETTIME_TIMEVAL(&now);
11338         switch (net->ro._l_addr.sa.sa_family) {
11339 #ifdef INET
11340         case AF_INET:
11341                 break;
11342 #endif
11343 #ifdef INET6
11344         case AF_INET6:
11345                 break;
11346 #endif
11347         default:
11348                 return;
11349         }
11350         sctp_alloc_a_chunk(stcb, chk);
11351         if (chk == NULL) {
11352                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11353                 return;
11354         }
11355
11356         chk->copy_by_ref = 0;
11357         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11358         chk->rec.chunk_id.can_take_data = 1;
11359         chk->flags = 0;
11360         chk->asoc = &stcb->asoc;
11361         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11362
11363         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11364         if (chk->data == NULL) {
11365                 sctp_free_a_chunk(stcb, chk, so_locked);
11366                 return;
11367         }
11368         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11369         SCTP_BUF_LEN(chk->data) = chk->send_size;
11370         chk->sent = SCTP_DATAGRAM_UNSENT;
11371         chk->snd_count = 0;
11372         chk->whoTo = net;
11373         atomic_add_int(&chk->whoTo->ref_count, 1);
11374         /* Now we have a mbuf that we can fill in with the details */
11375         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11376         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11377         /* fill out chunk header */
11378         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11379         hb->ch.chunk_flags = 0;
11380         hb->ch.chunk_length = htons(chk->send_size);
11381         /* Fill out hb parameter */
11382         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11383         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11384         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11385         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11386         /* Did our user request this one, put it in */
11387         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11388         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11389         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11390                 /*
11391                  * we only take from the entropy pool if the address is not
11392                  * confirmed.
11393                  */
11394                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11395                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11396         } else {
11397                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11398                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11399         }
11400         switch (net->ro._l_addr.sa.sa_family) {
11401 #ifdef INET
11402         case AF_INET:
11403                 memcpy(hb->heartbeat.hb_info.address,
11404                     &net->ro._l_addr.sin.sin_addr,
11405                     sizeof(net->ro._l_addr.sin.sin_addr));
11406                 break;
11407 #endif
11408 #ifdef INET6
11409         case AF_INET6:
11410                 memcpy(hb->heartbeat.hb_info.address,
11411                     &net->ro._l_addr.sin6.sin6_addr,
11412                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11413                 break;
11414 #endif
11415         default:
11416                 if (chk->data) {
11417                         sctp_m_freem(chk->data);
11418                         chk->data = NULL;
11419                 }
11420                 sctp_free_a_chunk(stcb, chk, so_locked);
11421                 return;
11422                 break;
11423         }
11424         net->hb_responded = 0;
11425         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11426         stcb->asoc.ctrl_queue_cnt++;
11427         SCTP_STAT_INCR(sctps_sendheartbeat);
11428         return;
11429 }
11430
11431 void
11432 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11433     uint32_t high_tsn)
11434 {
11435         struct sctp_association *asoc;
11436         struct sctp_ecne_chunk *ecne;
11437         struct sctp_tmit_chunk *chk;
11438
11439         if (net == NULL) {
11440                 return;
11441         }
11442         asoc = &stcb->asoc;
11443         SCTP_TCB_LOCK_ASSERT(stcb);
11444         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11445                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11446                         /* found a previous ECN_ECHO update it if needed */
11447                         uint32_t cnt, ctsn;
11448
11449                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11450                         ctsn = ntohl(ecne->tsn);
11451                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11452                                 ecne->tsn = htonl(high_tsn);
11453                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11454                         }
11455                         cnt = ntohl(ecne->num_pkts_since_cwr);
11456                         cnt++;
11457                         ecne->num_pkts_since_cwr = htonl(cnt);
11458                         return;
11459                 }
11460         }
11461         /* nope could not find one to update so we must build one */
11462         sctp_alloc_a_chunk(stcb, chk);
11463         if (chk == NULL) {
11464                 return;
11465         }
11466         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11467         chk->copy_by_ref = 0;
11468         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11469         chk->rec.chunk_id.can_take_data = 0;
11470         chk->flags = 0;
11471         chk->asoc = &stcb->asoc;
11472         chk->send_size = sizeof(struct sctp_ecne_chunk);
11473         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11474         if (chk->data == NULL) {
11475                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11476                 return;
11477         }
11478         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11479         SCTP_BUF_LEN(chk->data) = chk->send_size;
11480         chk->sent = SCTP_DATAGRAM_UNSENT;
11481         chk->snd_count = 0;
11482         chk->whoTo = net;
11483         atomic_add_int(&chk->whoTo->ref_count, 1);
11484
11485         stcb->asoc.ecn_echo_cnt_onq++;
11486         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11487         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11488         ecne->ch.chunk_flags = 0;
11489         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11490         ecne->tsn = htonl(high_tsn);
11491         ecne->num_pkts_since_cwr = htonl(1);
11492         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11493         asoc->ctrl_queue_cnt++;
11494 }
11495
11496 void
11497 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11498     struct mbuf *m, int len, int iphlen, int bad_crc)
11499 {
11500         struct sctp_association *asoc;
11501         struct sctp_pktdrop_chunk *drp;
11502         struct sctp_tmit_chunk *chk;
11503         uint8_t *datap;
11504         int was_trunc = 0;
11505         int fullsz = 0;
11506         long spc;
11507         int offset;
11508         struct sctp_chunkhdr *ch, chunk_buf;
11509         unsigned int chk_length;
11510
11511         if (!stcb) {
11512                 return;
11513         }
11514         asoc = &stcb->asoc;
11515         SCTP_TCB_LOCK_ASSERT(stcb);
11516         if (asoc->pktdrop_supported == 0) {
11517                 /*-
11518                  * peer must declare support before I send one.
11519                  */
11520                 return;
11521         }
11522         if (stcb->sctp_socket == NULL) {
11523                 return;
11524         }
11525         sctp_alloc_a_chunk(stcb, chk);
11526         if (chk == NULL) {
11527                 return;
11528         }
11529         chk->copy_by_ref = 0;
11530         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11531         chk->rec.chunk_id.can_take_data = 1;
11532         chk->flags = 0;
11533         len -= iphlen;
11534         chk->send_size = len;
11535         /* Validate that we do not have an ABORT in here. */
11536         offset = iphlen + sizeof(struct sctphdr);
11537         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11538             sizeof(*ch), (uint8_t *)&chunk_buf);
11539         while (ch != NULL) {
11540                 chk_length = ntohs(ch->chunk_length);
11541                 if (chk_length < sizeof(*ch)) {
11542                         /* break to abort land */
11543                         break;
11544                 }
11545                 switch (ch->chunk_type) {
11546                 case SCTP_PACKET_DROPPED:
11547                 case SCTP_ABORT_ASSOCIATION:
11548                 case SCTP_INITIATION_ACK:
11549                         /**
11550                          * We don't respond with an PKT-DROP to an ABORT
11551                          * or PKT-DROP. We also do not respond to an
11552                          * INIT-ACK, because we can't know if the initiation
11553                          * tag is correct or not.
11554                          */
11555                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11556                         return;
11557                 default:
11558                         break;
11559                 }
11560                 offset += SCTP_SIZE32(chk_length);
11561                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11562                     sizeof(*ch), (uint8_t *)&chunk_buf);
11563         }
11564
11565         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11566             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11567                 /*
11568                  * only send 1 mtu worth, trim off the excess on the end.
11569                  */
11570                 fullsz = len;
11571                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11572                 was_trunc = 1;
11573         }
11574         chk->asoc = &stcb->asoc;
11575         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11576         if (chk->data == NULL) {
11577 jump_out:
11578                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11579                 return;
11580         }
11581         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11582         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11583         if (drp == NULL) {
11584                 sctp_m_freem(chk->data);
11585                 chk->data = NULL;
11586                 goto jump_out;
11587         }
11588         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11589             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11590         chk->book_size_scale = 0;
11591         if (was_trunc) {
11592                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11593                 drp->trunc_len = htons(fullsz);
11594                 /*
11595                  * Len is already adjusted to size minus overhead above take
11596                  * out the pkt_drop chunk itself from it.
11597                  */
11598                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11599                 len = chk->send_size;
11600         } else {
11601                 /* no truncation needed */
11602                 drp->ch.chunk_flags = 0;
11603                 drp->trunc_len = htons(0);
11604         }
11605         if (bad_crc) {
11606                 drp->ch.chunk_flags |= SCTP_BADCRC;
11607         }
11608         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11609         SCTP_BUF_LEN(chk->data) = chk->send_size;
11610         chk->sent = SCTP_DATAGRAM_UNSENT;
11611         chk->snd_count = 0;
11612         if (net) {
11613                 /* we should hit here */
11614                 chk->whoTo = net;
11615                 atomic_add_int(&chk->whoTo->ref_count, 1);
11616         } else {
11617                 chk->whoTo = NULL;
11618         }
11619         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11620         drp->ch.chunk_length = htons(chk->send_size);
11621         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11622         if (spc < 0) {
11623                 spc = 0;
11624         }
11625         drp->bottle_bw = htonl(spc);
11626         if (asoc->my_rwnd) {
11627                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11628                     asoc->size_on_all_streams +
11629                     asoc->my_rwnd_control_len +
11630                     stcb->sctp_socket->so_rcv.sb_cc);
11631         } else {
11632                 /*-
11633                  * If my rwnd is 0, possibly from mbuf depletion as well as
11634                  * space used, tell the peer there is NO space aka onq == bw
11635                  */
11636                 drp->current_onq = htonl(spc);
11637         }
11638         drp->reserved = 0;
11639         datap = drp->data;
11640         m_copydata(m, iphlen, len, (caddr_t)datap);
11641         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11642         asoc->ctrl_queue_cnt++;
11643 }
11644
11645 void
11646 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11647 {
11648         struct sctp_association *asoc;
11649         struct sctp_cwr_chunk *cwr;
11650         struct sctp_tmit_chunk *chk;
11651
11652         SCTP_TCB_LOCK_ASSERT(stcb);
11653         if (net == NULL) {
11654                 return;
11655         }
11656         asoc = &stcb->asoc;
11657         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11658                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11659                         /*
11660                          * found a previous CWR queued to same destination
11661                          * update it if needed
11662                          */
11663                         uint32_t ctsn;
11664
11665                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11666                         ctsn = ntohl(cwr->tsn);
11667                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11668                                 cwr->tsn = htonl(high_tsn);
11669                         }
11670                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11671                                 /* Make sure override is carried */
11672                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11673                         }
11674                         return;
11675                 }
11676         }
11677         sctp_alloc_a_chunk(stcb, chk);
11678         if (chk == NULL) {
11679                 return;
11680         }
11681         chk->copy_by_ref = 0;
11682         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11683         chk->rec.chunk_id.can_take_data = 1;
11684         chk->flags = 0;
11685         chk->asoc = &stcb->asoc;
11686         chk->send_size = sizeof(struct sctp_cwr_chunk);
11687         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11688         if (chk->data == NULL) {
11689                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11690                 return;
11691         }
11692         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11693         SCTP_BUF_LEN(chk->data) = chk->send_size;
11694         chk->sent = SCTP_DATAGRAM_UNSENT;
11695         chk->snd_count = 0;
11696         chk->whoTo = net;
11697         atomic_add_int(&chk->whoTo->ref_count, 1);
11698         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11699         cwr->ch.chunk_type = SCTP_ECN_CWR;
11700         cwr->ch.chunk_flags = override;
11701         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11702         cwr->tsn = htonl(high_tsn);
11703         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11704         asoc->ctrl_queue_cnt++;
11705 }
11706
11707 static int
11708 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11709     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11710 {
11711         uint16_t len, old_len, i;
11712         struct sctp_stream_reset_out_request *req_out;
11713         struct sctp_chunkhdr *ch;
11714         int at;
11715         int number_entries = 0;
11716
11717         ch = mtod(chk->data, struct sctp_chunkhdr *);
11718         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11719         /* get to new offset for the param. */
11720         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11721         /* now how long will this param be? */
11722         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11723                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11724                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11725                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11726                         number_entries++;
11727                 }
11728         }
11729         if (number_entries == 0) {
11730                 return (0);
11731         }
11732         if (number_entries == stcb->asoc.streamoutcnt) {
11733                 number_entries = 0;
11734         }
11735         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11736                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11737         }
11738         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11739         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11740         req_out->ph.param_length = htons(len);
11741         req_out->request_seq = htonl(seq);
11742         req_out->response_seq = htonl(resp_seq);
11743         req_out->send_reset_at_tsn = htonl(last_sent);
11744         at = 0;
11745         if (number_entries) {
11746                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11747                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11748                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11749                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11750                                 req_out->list_of_streams[at] = htons(i);
11751                                 at++;
11752                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11753                                 if (at >= number_entries) {
11754                                         break;
11755                                 }
11756                         }
11757                 }
11758         } else {
11759                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11760                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11761                 }
11762         }
11763         if (SCTP_SIZE32(len) > len) {
11764                 /*-
11765                  * Need to worry about the pad we may end up adding to the
11766                  * end. This is easy since the struct is either aligned to 4
11767                  * bytes or 2 bytes off.
11768                  */
11769                 req_out->list_of_streams[number_entries] = 0;
11770         }
11771         /* now fix the chunk length */
11772         ch->chunk_length = htons(len + old_len);
11773         chk->book_size = len + old_len;
11774         chk->book_size_scale = 0;
11775         chk->send_size = SCTP_SIZE32(chk->book_size);
11776         SCTP_BUF_LEN(chk->data) = chk->send_size;
11777         return (1);
11778 }
11779
11780 static void
11781 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11782     int number_entries, uint16_t *list,
11783     uint32_t seq)
11784 {
11785         uint16_t len, old_len, i;
11786         struct sctp_stream_reset_in_request *req_in;
11787         struct sctp_chunkhdr *ch;
11788
11789         ch = mtod(chk->data, struct sctp_chunkhdr *);
11790         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11791
11792         /* get to new offset for the param. */
11793         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11794         /* now how long will this param be? */
11795         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11796         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11797         req_in->ph.param_length = htons(len);
11798         req_in->request_seq = htonl(seq);
11799         if (number_entries) {
11800                 for (i = 0; i < number_entries; i++) {
11801                         req_in->list_of_streams[i] = htons(list[i]);
11802                 }
11803         }
11804         if (SCTP_SIZE32(len) > len) {
11805                 /*-
11806                  * Need to worry about the pad we may end up adding to the
11807                  * end. This is easy since the struct is either aligned to 4
11808                  * bytes or 2 bytes off.
11809                  */
11810                 req_in->list_of_streams[number_entries] = 0;
11811         }
11812         /* now fix the chunk length */
11813         ch->chunk_length = htons(len + old_len);
11814         chk->book_size = len + old_len;
11815         chk->book_size_scale = 0;
11816         chk->send_size = SCTP_SIZE32(chk->book_size);
11817         SCTP_BUF_LEN(chk->data) = chk->send_size;
11818         return;
11819 }
11820
11821 static void
11822 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11823     uint32_t seq)
11824 {
11825         uint16_t len, old_len;
11826         struct sctp_stream_reset_tsn_request *req_tsn;
11827         struct sctp_chunkhdr *ch;
11828
11829         ch = mtod(chk->data, struct sctp_chunkhdr *);
11830         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11831
11832         /* get to new offset for the param. */
11833         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11834         /* now how long will this param be? */
11835         len = sizeof(struct sctp_stream_reset_tsn_request);
11836         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11837         req_tsn->ph.param_length = htons(len);
11838         req_tsn->request_seq = htonl(seq);
11839
11840         /* now fix the chunk length */
11841         ch->chunk_length = htons(len + old_len);
11842         chk->send_size = len + old_len;
11843         chk->book_size = SCTP_SIZE32(chk->send_size);
11844         chk->book_size_scale = 0;
11845         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11846         return;
11847 }
11848
11849 void
11850 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11851     uint32_t resp_seq, uint32_t result)
11852 {
11853         uint16_t len, old_len;
11854         struct sctp_stream_reset_response *resp;
11855         struct sctp_chunkhdr *ch;
11856
11857         ch = mtod(chk->data, struct sctp_chunkhdr *);
11858         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11859
11860         /* get to new offset for the param. */
11861         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11862         /* now how long will this param be? */
11863         len = sizeof(struct sctp_stream_reset_response);
11864         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11865         resp->ph.param_length = htons(len);
11866         resp->response_seq = htonl(resp_seq);
11867         resp->result = ntohl(result);
11868
11869         /* now fix the chunk length */
11870         ch->chunk_length = htons(len + old_len);
11871         chk->book_size = len + old_len;
11872         chk->book_size_scale = 0;
11873         chk->send_size = SCTP_SIZE32(chk->book_size);
11874         SCTP_BUF_LEN(chk->data) = chk->send_size;
11875         return;
11876 }
11877
11878 void
11879 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11880     struct sctp_stream_reset_list *ent,
11881     int response)
11882 {
11883         struct sctp_association *asoc;
11884         struct sctp_tmit_chunk *chk;
11885         struct sctp_chunkhdr *ch;
11886
11887         asoc = &stcb->asoc;
11888
11889         /*
11890          * Reset our last reset action to the new one IP -> response
11891          * (PERFORMED probably). This assures that if we fail to send, a
11892          * retran from the peer will get the new response.
11893          */
11894         asoc->last_reset_action[0] = response;
11895         if (asoc->stream_reset_outstanding) {
11896                 return;
11897         }
11898         sctp_alloc_a_chunk(stcb, chk);
11899         if (chk == NULL) {
11900                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11901                 return;
11902         }
11903         chk->copy_by_ref = 0;
11904         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11905         chk->rec.chunk_id.can_take_data = 0;
11906         chk->flags = 0;
11907         chk->asoc = &stcb->asoc;
11908         chk->book_size = sizeof(struct sctp_chunkhdr);
11909         chk->send_size = SCTP_SIZE32(chk->book_size);
11910         chk->book_size_scale = 0;
11911         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11912         if (chk->data == NULL) {
11913                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11914                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11915                 return;
11916         }
11917         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11918         /* setup chunk parameters */
11919         chk->sent = SCTP_DATAGRAM_UNSENT;
11920         chk->snd_count = 0;
11921         if (stcb->asoc.alternate) {
11922                 chk->whoTo = stcb->asoc.alternate;
11923         } else {
11924                 chk->whoTo = stcb->asoc.primary_destination;
11925         }
11926         ch = mtod(chk->data, struct sctp_chunkhdr *);
11927         ch->chunk_type = SCTP_STREAM_RESET;
11928         ch->chunk_flags = 0;
11929         ch->chunk_length = htons(chk->book_size);
11930         atomic_add_int(&chk->whoTo->ref_count, 1);
11931         SCTP_BUF_LEN(chk->data) = chk->send_size;
11932         sctp_add_stream_reset_result(chk, ent->seq, response);
11933         /* insert the chunk for sending */
11934         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11935             chk,
11936             sctp_next);
11937         asoc->ctrl_queue_cnt++;
11938 }
11939
11940 void
11941 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11942     uint32_t resp_seq, uint32_t result,
11943     uint32_t send_una, uint32_t recv_next)
11944 {
11945         uint16_t len, old_len;
11946         struct sctp_stream_reset_response_tsn *resp;
11947         struct sctp_chunkhdr *ch;
11948
11949         ch = mtod(chk->data, struct sctp_chunkhdr *);
11950         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11951
11952         /* get to new offset for the param. */
11953         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11954         /* now how long will this param be? */
11955         len = sizeof(struct sctp_stream_reset_response_tsn);
11956         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11957         resp->ph.param_length = htons(len);
11958         resp->response_seq = htonl(resp_seq);
11959         resp->result = htonl(result);
11960         resp->senders_next_tsn = htonl(send_una);
11961         resp->receivers_next_tsn = htonl(recv_next);
11962
11963         /* now fix the chunk length */
11964         ch->chunk_length = htons(len + old_len);
11965         chk->book_size = len + old_len;
11966         chk->send_size = SCTP_SIZE32(chk->book_size);
11967         chk->book_size_scale = 0;
11968         SCTP_BUF_LEN(chk->data) = chk->send_size;
11969         return;
11970 }
11971
11972 static void
11973 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11974     uint32_t seq,
11975     uint16_t adding)
11976 {
11977         uint16_t len, old_len;
11978         struct sctp_chunkhdr *ch;
11979         struct sctp_stream_reset_add_strm *addstr;
11980
11981         ch = mtod(chk->data, struct sctp_chunkhdr *);
11982         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11983
11984         /* get to new offset for the param. */
11985         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11986         /* now how long will this param be? */
11987         len = sizeof(struct sctp_stream_reset_add_strm);
11988
11989         /* Fill it out. */
11990         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11991         addstr->ph.param_length = htons(len);
11992         addstr->request_seq = htonl(seq);
11993         addstr->number_of_streams = htons(adding);
11994         addstr->reserved = 0;
11995
11996         /* now fix the chunk length */
11997         ch->chunk_length = htons(len + old_len);
11998         chk->send_size = len + old_len;
11999         chk->book_size = SCTP_SIZE32(chk->send_size);
12000         chk->book_size_scale = 0;
12001         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12002         return;
12003 }
12004
12005 static void
12006 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12007     uint32_t seq,
12008     uint16_t adding)
12009 {
12010         uint16_t len, old_len;
12011         struct sctp_chunkhdr *ch;
12012         struct sctp_stream_reset_add_strm *addstr;
12013
12014         ch = mtod(chk->data, struct sctp_chunkhdr *);
12015         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12016
12017         /* get to new offset for the param. */
12018         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12019         /* now how long will this param be? */
12020         len = sizeof(struct sctp_stream_reset_add_strm);
12021         /* Fill it out. */
12022         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12023         addstr->ph.param_length = htons(len);
12024         addstr->request_seq = htonl(seq);
12025         addstr->number_of_streams = htons(adding);
12026         addstr->reserved = 0;
12027
12028         /* now fix the chunk length */
12029         ch->chunk_length = htons(len + old_len);
12030         chk->send_size = len + old_len;
12031         chk->book_size = SCTP_SIZE32(chk->send_size);
12032         chk->book_size_scale = 0;
12033         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12034         return;
12035 }
12036
12037 int
12038 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12039 {
12040         struct sctp_association *asoc;
12041         struct sctp_tmit_chunk *chk;
12042         struct sctp_chunkhdr *ch;
12043         uint32_t seq;
12044
12045         asoc = &stcb->asoc;
12046         asoc->trigger_reset = 0;
12047         if (asoc->stream_reset_outstanding) {
12048                 return (EALREADY);
12049         }
12050         sctp_alloc_a_chunk(stcb, chk);
12051         if (chk == NULL) {
12052                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12053                 return (ENOMEM);
12054         }
12055         chk->copy_by_ref = 0;
12056         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12057         chk->rec.chunk_id.can_take_data = 0;
12058         chk->flags = 0;
12059         chk->asoc = &stcb->asoc;
12060         chk->book_size = sizeof(struct sctp_chunkhdr);
12061         chk->send_size = SCTP_SIZE32(chk->book_size);
12062         chk->book_size_scale = 0;
12063         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12064         if (chk->data == NULL) {
12065                 sctp_free_a_chunk(stcb, chk, so_locked);
12066                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12067                 return (ENOMEM);
12068         }
12069         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12070
12071         /* setup chunk parameters */
12072         chk->sent = SCTP_DATAGRAM_UNSENT;
12073         chk->snd_count = 0;
12074         if (stcb->asoc.alternate) {
12075                 chk->whoTo = stcb->asoc.alternate;
12076         } else {
12077                 chk->whoTo = stcb->asoc.primary_destination;
12078         }
12079         ch = mtod(chk->data, struct sctp_chunkhdr *);
12080         ch->chunk_type = SCTP_STREAM_RESET;
12081         ch->chunk_flags = 0;
12082         ch->chunk_length = htons(chk->book_size);
12083         atomic_add_int(&chk->whoTo->ref_count, 1);
12084         SCTP_BUF_LEN(chk->data) = chk->send_size;
12085         seq = stcb->asoc.str_reset_seq_out;
12086         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12087                 seq++;
12088                 asoc->stream_reset_outstanding++;
12089         } else {
12090                 m_freem(chk->data);
12091                 chk->data = NULL;
12092                 sctp_free_a_chunk(stcb, chk, so_locked);
12093                 return (ENOENT);
12094         }
12095         asoc->str_reset = chk;
12096         /* insert the chunk for sending */
12097         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12098             chk,
12099             sctp_next);
12100         asoc->ctrl_queue_cnt++;
12101
12102         if (stcb->asoc.send_sack) {
12103                 sctp_send_sack(stcb, so_locked);
12104         }
12105         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12106         return (0);
12107 }
12108
12109 int
12110 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12111     uint16_t number_entries, uint16_t *list,
12112     uint8_t send_in_req,
12113     uint8_t send_tsn_req,
12114     uint8_t add_stream,
12115     uint16_t adding_o,
12116     uint16_t adding_i, uint8_t peer_asked)
12117 {
12118         struct sctp_association *asoc;
12119         struct sctp_tmit_chunk *chk;
12120         struct sctp_chunkhdr *ch;
12121         int can_send_out_req = 0;
12122         uint32_t seq;
12123
12124         asoc = &stcb->asoc;
12125         if (asoc->stream_reset_outstanding) {
12126                 /*-
12127                  * Already one pending, must get ACK back to clear the flag.
12128                  */
12129                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12130                 return (EBUSY);
12131         }
12132         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12133             (add_stream == 0)) {
12134                 /* nothing to do */
12135                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12136                 return (EINVAL);
12137         }
12138         if (send_tsn_req && send_in_req) {
12139                 /* error, can't do that */
12140                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12141                 return (EINVAL);
12142         } else if (send_in_req) {
12143                 can_send_out_req = 1;
12144         }
12145         if (number_entries > (MCLBYTES -
12146             SCTP_MIN_OVERHEAD -
12147             sizeof(struct sctp_chunkhdr) -
12148             sizeof(struct sctp_stream_reset_out_request)) /
12149             sizeof(uint16_t)) {
12150                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12151                 return (ENOMEM);
12152         }
12153         sctp_alloc_a_chunk(stcb, chk);
12154         if (chk == NULL) {
12155                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12156                 return (ENOMEM);
12157         }
12158         chk->copy_by_ref = 0;
12159         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12160         chk->rec.chunk_id.can_take_data = 0;
12161         chk->flags = 0;
12162         chk->asoc = &stcb->asoc;
12163         chk->book_size = sizeof(struct sctp_chunkhdr);
12164         chk->send_size = SCTP_SIZE32(chk->book_size);
12165         chk->book_size_scale = 0;
12166
12167         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12168         if (chk->data == NULL) {
12169                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12170                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12171                 return (ENOMEM);
12172         }
12173         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12174
12175         /* setup chunk parameters */
12176         chk->sent = SCTP_DATAGRAM_UNSENT;
12177         chk->snd_count = 0;
12178         if (stcb->asoc.alternate) {
12179                 chk->whoTo = stcb->asoc.alternate;
12180         } else {
12181                 chk->whoTo = stcb->asoc.primary_destination;
12182         }
12183         atomic_add_int(&chk->whoTo->ref_count, 1);
12184         ch = mtod(chk->data, struct sctp_chunkhdr *);
12185         ch->chunk_type = SCTP_STREAM_RESET;
12186         ch->chunk_flags = 0;
12187         ch->chunk_length = htons(chk->book_size);
12188         SCTP_BUF_LEN(chk->data) = chk->send_size;
12189
12190         seq = stcb->asoc.str_reset_seq_out;
12191         if (can_send_out_req) {
12192                 int ret;
12193
12194                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12195                 if (ret) {
12196                         seq++;
12197                         asoc->stream_reset_outstanding++;
12198                 }
12199         }
12200         if ((add_stream & 1) &&
12201             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12202                 /* Need to allocate more */
12203                 struct sctp_stream_out *oldstream;
12204                 struct sctp_stream_queue_pending *sp, *nsp;
12205                 int i;
12206 #if defined(SCTP_DETAILED_STR_STATS)
12207                 int j;
12208 #endif
12209
12210                 oldstream = stcb->asoc.strmout;
12211                 /* get some more */
12212                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12213                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12214                     SCTP_M_STRMO);
12215                 if (stcb->asoc.strmout == NULL) {
12216                         uint8_t x;
12217
12218                         stcb->asoc.strmout = oldstream;
12219                         /* Turn off the bit */
12220                         x = add_stream & 0xfe;
12221                         add_stream = x;
12222                         goto skip_stuff;
12223                 }
12224                 /*
12225                  * Ok now we proceed with copying the old out stuff and
12226                  * initializing the new stuff.
12227                  */
12228                 SCTP_TCB_SEND_LOCK(stcb);
12229                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12230                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12231                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12232                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12233                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12234                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12235                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12236                         stcb->asoc.strmout[i].sid = i;
12237                         stcb->asoc.strmout[i].state = oldstream[i].state;
12238                         /* FIX ME FIX ME */
12239                         /*
12240                          * This should be a SS_COPY operation FIX ME STREAM
12241                          * SCHEDULER EXPERT
12242                          */
12243                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12244                         /* now anything on those queues? */
12245                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12246                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12247                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12248                         }
12249
12250                 }
12251                 /* now the new streams */
12252                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12253                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12254                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12255                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12256 #if defined(SCTP_DETAILED_STR_STATS)
12257                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12258                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12259                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12260                         }
12261 #else
12262                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12263                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12264 #endif
12265                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12266                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12267                         stcb->asoc.strmout[i].sid = i;
12268                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12269                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12270                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12271                 }
12272                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12273                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12274                 SCTP_TCB_SEND_UNLOCK(stcb);
12275         }
12276 skip_stuff:
12277         if ((add_stream & 1) && (adding_o > 0)) {
12278                 asoc->strm_pending_add_size = adding_o;
12279                 asoc->peer_req_out = peer_asked;
12280                 sctp_add_an_out_stream(chk, seq, adding_o);
12281                 seq++;
12282                 asoc->stream_reset_outstanding++;
12283         }
12284         if ((add_stream & 2) && (adding_i > 0)) {
12285                 sctp_add_an_in_stream(chk, seq, adding_i);
12286                 seq++;
12287                 asoc->stream_reset_outstanding++;
12288         }
12289         if (send_in_req) {
12290                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12291                 seq++;
12292                 asoc->stream_reset_outstanding++;
12293         }
12294         if (send_tsn_req) {
12295                 sctp_add_stream_reset_tsn(chk, seq);
12296                 asoc->stream_reset_outstanding++;
12297         }
12298         asoc->str_reset = chk;
12299         /* insert the chunk for sending */
12300         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12301             chk,
12302             sctp_next);
12303         asoc->ctrl_queue_cnt++;
12304         if (stcb->asoc.send_sack) {
12305                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12306         }
12307         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12308         return (0);
12309 }
12310
12311 void
12312 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12313     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12314     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12315     uint32_t vrf_id, uint16_t port)
12316 {
12317         /* Don't respond to an ABORT with an ABORT. */
12318         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12319                 if (cause)
12320                         sctp_m_freem(cause);
12321                 return;
12322         }
12323         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12324             mflowtype, mflowid, fibnum,
12325             vrf_id, port);
12326         return;
12327 }
12328
12329 void
12330 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12331     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12332     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12333     uint32_t vrf_id, uint16_t port)
12334 {
12335         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12336             mflowtype, mflowid, fibnum,
12337             vrf_id, port);
12338         return;
12339 }
12340
12341 static struct mbuf *
12342 sctp_copy_resume(struct uio *uio,
12343     int max_send_len,
12344     int user_marks_eor,
12345     int *error,
12346     uint32_t *sndout,
12347     struct mbuf **new_tail)
12348 {
12349         struct mbuf *m;
12350
12351         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12352             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12353         if (m == NULL) {
12354                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12355                 *error = ENOBUFS;
12356         } else {
12357                 *sndout = m_length(m, NULL);
12358                 *new_tail = m_last(m);
12359         }
12360         return (m);
12361 }
12362
12363 static int
12364 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12365     struct uio *uio,
12366     int resv_upfront)
12367 {
12368         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12369             resv_upfront, 0);
12370         if (sp->data == NULL) {
12371                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12372                 return (ENOBUFS);
12373         }
12374
12375         sp->tail_mbuf = m_last(sp->data);
12376         return (0);
12377 }
12378
12379
12380
12381 static struct sctp_stream_queue_pending *
12382 sctp_copy_it_in(struct sctp_tcb *stcb,
12383     struct sctp_association *asoc,
12384     struct sctp_sndrcvinfo *srcv,
12385     struct uio *uio,
12386     struct sctp_nets *net,
12387     int max_send_len,
12388     int user_marks_eor,
12389     int *error)
12390 {
12391
12392         /*-
12393          * This routine must be very careful in its work. Protocol
12394          * processing is up and running so care must be taken to spl...()
12395          * when you need to do something that may effect the stcb/asoc. The
12396          * sb is locked however. When data is copied the protocol processing
12397          * should be enabled since this is a slower operation...
12398          */
12399         struct sctp_stream_queue_pending *sp = NULL;
12400         int resv_in_first;
12401
12402         *error = 0;
12403         /* Now can we send this? */
12404         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12405             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12406             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12407             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12408                 /* got data while shutting down */
12409                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12410                 *error = ECONNRESET;
12411                 goto out_now;
12412         }
12413         sctp_alloc_a_strmoq(stcb, sp);
12414         if (sp == NULL) {
12415                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12416                 *error = ENOMEM;
12417                 goto out_now;
12418         }
12419         sp->act_flags = 0;
12420         sp->sender_all_done = 0;
12421         sp->sinfo_flags = srcv->sinfo_flags;
12422         sp->timetolive = srcv->sinfo_timetolive;
12423         sp->ppid = srcv->sinfo_ppid;
12424         sp->context = srcv->sinfo_context;
12425         sp->fsn = 0;
12426         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12427
12428         sp->sid = srcv->sinfo_stream;
12429         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12430         if ((sp->length == (uint32_t)uio->uio_resid) &&
12431             ((user_marks_eor == 0) ||
12432             (srcv->sinfo_flags & SCTP_EOF) ||
12433             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12434                 sp->msg_is_complete = 1;
12435         } else {
12436                 sp->msg_is_complete = 0;
12437         }
12438         sp->sender_all_done = 0;
12439         sp->some_taken = 0;
12440         sp->put_last_out = 0;
12441         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12442         sp->data = sp->tail_mbuf = NULL;
12443         if (sp->length == 0) {
12444                 goto skip_copy;
12445         }
12446         if (srcv->sinfo_keynumber_valid) {
12447                 sp->auth_keyid = srcv->sinfo_keynumber;
12448         } else {
12449                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12450         }
12451         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12452                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12453                 sp->holds_key_ref = 1;
12454         }
12455         *error = sctp_copy_one(sp, uio, resv_in_first);
12456 skip_copy:
12457         if (*error) {
12458                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12459                 sp = NULL;
12460         } else {
12461                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12462                         sp->net = net;
12463                         atomic_add_int(&sp->net->ref_count, 1);
12464                 } else {
12465                         sp->net = NULL;
12466                 }
12467                 sctp_set_prsctp_policy(sp);
12468         }
12469 out_now:
12470         return (sp);
12471 }
12472
12473
12474 int
12475 sctp_sosend(struct socket *so,
12476     struct sockaddr *addr,
12477     struct uio *uio,
12478     struct mbuf *top,
12479     struct mbuf *control,
12480     int flags,
12481     struct thread *p
12482 )
12483 {
12484         int error, use_sndinfo = 0;
12485         struct sctp_sndrcvinfo sndrcvninfo;
12486         struct sockaddr *addr_to_use;
12487 #if defined(INET) && defined(INET6)
12488         struct sockaddr_in sin;
12489 #endif
12490
12491         if (control) {
12492                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12493                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12494                     sizeof(sndrcvninfo))) {
12495                         /* got one */
12496                         use_sndinfo = 1;
12497                 }
12498         }
12499         addr_to_use = addr;
12500 #if defined(INET) && defined(INET6)
12501         if ((addr) && (addr->sa_family == AF_INET6)) {
12502                 struct sockaddr_in6 *sin6;
12503
12504                 sin6 = (struct sockaddr_in6 *)addr;
12505                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12506                         in6_sin6_2_sin(&sin, sin6);
12507                         addr_to_use = (struct sockaddr *)&sin;
12508                 }
12509         }
12510 #endif
12511         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12512             control,
12513             flags,
12514             use_sndinfo ? &sndrcvninfo : NULL
12515             ,p
12516             );
12517         return (error);
12518 }
12519
12520
12521 int
12522 sctp_lower_sosend(struct socket *so,
12523     struct sockaddr *addr,
12524     struct uio *uio,
12525     struct mbuf *i_pak,
12526     struct mbuf *control,
12527     int flags,
12528     struct sctp_sndrcvinfo *srcv
12529     ,
12530     struct thread *p
12531 )
12532 {
12533         unsigned int sndlen = 0, max_len;
12534         int error, len;
12535         struct mbuf *top = NULL;
12536         int queue_only = 0, queue_only_for_init = 0;
12537         int free_cnt_applied = 0;
12538         int un_sent;
12539         int now_filled = 0;
12540         unsigned int inqueue_bytes = 0;
12541         struct sctp_block_entry be;
12542         struct sctp_inpcb *inp;
12543         struct sctp_tcb *stcb = NULL;
12544         struct timeval now;
12545         struct sctp_nets *net;
12546         struct sctp_association *asoc;
12547         struct sctp_inpcb *t_inp;
12548         int user_marks_eor;
12549         int create_lock_applied = 0;
12550         int nagle_applies = 0;
12551         int some_on_control = 0;
12552         int got_all_of_the_send = 0;
12553         int hold_tcblock = 0;
12554         int non_blocking = 0;
12555         uint32_t local_add_more, local_soresv = 0;
12556         uint16_t port;
12557         uint16_t sinfo_flags;
12558         sctp_assoc_t sinfo_assoc_id;
12559
12560         error = 0;
12561         net = NULL;
12562         stcb = NULL;
12563         asoc = NULL;
12564
12565         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12566         if (inp == NULL) {
12567                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12568                 error = EINVAL;
12569                 if (i_pak) {
12570                         SCTP_RELEASE_PKT(i_pak);
12571                 }
12572                 return (error);
12573         }
12574         if ((uio == NULL) && (i_pak == NULL)) {
12575                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12576                 return (EINVAL);
12577         }
12578         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12579         atomic_add_int(&inp->total_sends, 1);
12580         if (uio) {
12581                 if (uio->uio_resid < 0) {
12582                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12583                         return (EINVAL);
12584                 }
12585                 sndlen = (unsigned int)uio->uio_resid;
12586         } else {
12587                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12588                 sndlen = SCTP_HEADER_LEN(i_pak);
12589         }
12590         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12591             (void *)addr,
12592             sndlen);
12593         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12594             SCTP_IS_LISTENING(inp)) {
12595                 /* The listener can NOT send */
12596                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12597                 error = ENOTCONN;
12598                 goto out_unlocked;
12599         }
12600         /**
12601          * Pre-screen address, if one is given the sin-len
12602          * must be set correctly!
12603          */
12604         if (addr) {
12605                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12606
12607                 switch (raddr->sa.sa_family) {
12608 #ifdef INET
12609                 case AF_INET:
12610                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12611                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12612                                 error = EINVAL;
12613                                 goto out_unlocked;
12614                         }
12615                         port = raddr->sin.sin_port;
12616                         break;
12617 #endif
12618 #ifdef INET6
12619                 case AF_INET6:
12620                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12621                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12622                                 error = EINVAL;
12623                                 goto out_unlocked;
12624                         }
12625                         port = raddr->sin6.sin6_port;
12626                         break;
12627 #endif
12628                 default:
12629                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12630                         error = EAFNOSUPPORT;
12631                         goto out_unlocked;
12632                 }
12633         } else
12634                 port = 0;
12635
12636         if (srcv) {
12637                 sinfo_flags = srcv->sinfo_flags;
12638                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12639                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12640                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12641                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12642                         error = EINVAL;
12643                         goto out_unlocked;
12644                 }
12645                 if (srcv->sinfo_flags)
12646                         SCTP_STAT_INCR(sctps_sends_with_flags);
12647         } else {
12648                 sinfo_flags = inp->def_send.sinfo_flags;
12649                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12650         }
12651         if (sinfo_flags & SCTP_SENDALL) {
12652                 /* its a sendall */
12653                 error = sctp_sendall(inp, uio, top, srcv);
12654                 top = NULL;
12655                 goto out_unlocked;
12656         }
12657         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12658                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12659                 error = EINVAL;
12660                 goto out_unlocked;
12661         }
12662         /* now we must find the assoc */
12663         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12664             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12665                 SCTP_INP_RLOCK(inp);
12666                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12667                 if (stcb) {
12668                         SCTP_TCB_LOCK(stcb);
12669                         hold_tcblock = 1;
12670                 }
12671                 SCTP_INP_RUNLOCK(inp);
12672         } else if (sinfo_assoc_id) {
12673                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12674                 if (stcb != NULL) {
12675                         hold_tcblock = 1;
12676                 }
12677         } else if (addr) {
12678                 /*-
12679                  * Since we did not use findep we must
12680                  * increment it, and if we don't find a tcb
12681                  * decrement it.
12682                  */
12683                 SCTP_INP_WLOCK(inp);
12684                 SCTP_INP_INCR_REF(inp);
12685                 SCTP_INP_WUNLOCK(inp);
12686                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12687                 if (stcb == NULL) {
12688                         SCTP_INP_WLOCK(inp);
12689                         SCTP_INP_DECR_REF(inp);
12690                         SCTP_INP_WUNLOCK(inp);
12691                 } else {
12692                         hold_tcblock = 1;
12693                 }
12694         }
12695         if ((stcb == NULL) && (addr)) {
12696                 /* Possible implicit send? */
12697                 SCTP_ASOC_CREATE_LOCK(inp);
12698                 create_lock_applied = 1;
12699                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12700                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12701                         /* Should I really unlock ? */
12702                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12703                         error = EINVAL;
12704                         goto out_unlocked;
12705
12706                 }
12707                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12708                     (addr->sa_family == AF_INET6)) {
12709                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12710                         error = EINVAL;
12711                         goto out_unlocked;
12712                 }
12713                 SCTP_INP_WLOCK(inp);
12714                 SCTP_INP_INCR_REF(inp);
12715                 SCTP_INP_WUNLOCK(inp);
12716                 /* With the lock applied look again */
12717                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12718                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12719                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12720                 }
12721                 if (stcb == NULL) {
12722                         SCTP_INP_WLOCK(inp);
12723                         SCTP_INP_DECR_REF(inp);
12724                         SCTP_INP_WUNLOCK(inp);
12725                 } else {
12726                         hold_tcblock = 1;
12727                 }
12728                 if (error) {
12729                         goto out_unlocked;
12730                 }
12731                 if (t_inp != inp) {
12732                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12733                         error = ENOTCONN;
12734                         goto out_unlocked;
12735                 }
12736         }
12737         if (stcb == NULL) {
12738                 if (addr == NULL) {
12739                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12740                         error = ENOENT;
12741                         goto out_unlocked;
12742                 } else {
12743                         /* We must go ahead and start the INIT process */
12744                         uint32_t vrf_id;
12745
12746                         if ((sinfo_flags & SCTP_ABORT) ||
12747                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12748                                 /*-
12749                                  * User asks to abort a non-existant assoc,
12750                                  * or EOF a non-existant assoc with no data
12751                                  */
12752                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12753                                 error = ENOENT;
12754                                 goto out_unlocked;
12755                         }
12756                         /* get an asoc/stcb struct */
12757                         vrf_id = inp->def_vrf_id;
12758 #ifdef INVARIANTS
12759                         if (create_lock_applied == 0) {
12760                                 panic("Error, should hold create lock and I don't?");
12761                         }
12762 #endif
12763                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12764                             inp->sctp_ep.pre_open_stream_count,
12765                             inp->sctp_ep.port,
12766                             p);
12767                         if (stcb == NULL) {
12768                                 /* Error is setup for us in the call */
12769                                 goto out_unlocked;
12770                         }
12771                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12772                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12773                                 /*
12774                                  * Set the connected flag so we can queue
12775                                  * data
12776                                  */
12777                                 soisconnecting(so);
12778                         }
12779                         hold_tcblock = 1;
12780                         if (create_lock_applied) {
12781                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12782                                 create_lock_applied = 0;
12783                         } else {
12784                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12785                         }
12786                         /*
12787                          * Turn on queue only flag to prevent data from
12788                          * being sent
12789                          */
12790                         queue_only = 1;
12791                         asoc = &stcb->asoc;
12792                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12793                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12794
12795                         /* initialize authentication params for the assoc */
12796                         sctp_initialize_auth_params(inp, stcb);
12797
12798                         if (control) {
12799                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12800                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12801                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12802                                         hold_tcblock = 0;
12803                                         stcb = NULL;
12804                                         goto out_unlocked;
12805                                 }
12806                         }
12807                         /* out with the INIT */
12808                         queue_only_for_init = 1;
12809                         /*-
12810                          * we may want to dig in after this call and adjust the MTU
12811                          * value. It defaulted to 1500 (constant) but the ro
12812                          * structure may now have an update and thus we may need to
12813                          * change it BEFORE we append the message.
12814                          */
12815                 }
12816         } else
12817                 asoc = &stcb->asoc;
12818         if (srcv == NULL)
12819                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12820         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12821                 if (addr)
12822                         net = sctp_findnet(stcb, addr);
12823                 else
12824                         net = NULL;
12825                 if ((net == NULL) ||
12826                     ((port != 0) && (port != stcb->rport))) {
12827                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12828                         error = EINVAL;
12829                         goto out_unlocked;
12830                 }
12831         } else {
12832                 if (stcb->asoc.alternate) {
12833                         net = stcb->asoc.alternate;
12834                 } else {
12835                         net = stcb->asoc.primary_destination;
12836                 }
12837         }
12838         atomic_add_int(&stcb->total_sends, 1);
12839         /* Keep the stcb from being freed under our feet */
12840         atomic_add_int(&asoc->refcnt, 1);
12841         free_cnt_applied = 1;
12842
12843         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12844                 if (sndlen > asoc->smallest_mtu) {
12845                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12846                         error = EMSGSIZE;
12847                         goto out_unlocked;
12848                 }
12849         }
12850         if (SCTP_SO_IS_NBIO(so)
12851             || (flags & MSG_NBIO)
12852             ) {
12853                 non_blocking = 1;
12854         }
12855         /* would we block? */
12856         if (non_blocking) {
12857                 uint32_t amount;
12858
12859                 if (hold_tcblock == 0) {
12860                         SCTP_TCB_LOCK(stcb);
12861                         hold_tcblock = 1;
12862                 }
12863                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12864                 if (user_marks_eor == 0) {
12865                         amount = sndlen;
12866                 } else {
12867                         amount = 1;
12868                 }
12869                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12870                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12871                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12872                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12873                                 error = EMSGSIZE;
12874                         else
12875                                 error = EWOULDBLOCK;
12876                         goto out_unlocked;
12877                 }
12878                 stcb->asoc.sb_send_resv += sndlen;
12879                 SCTP_TCB_UNLOCK(stcb);
12880                 hold_tcblock = 0;
12881         } else {
12882                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12883         }
12884         local_soresv = sndlen;
12885         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12886                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12887                 error = ECONNRESET;
12888                 goto out_unlocked;
12889         }
12890         if (create_lock_applied) {
12891                 SCTP_ASOC_CREATE_UNLOCK(inp);
12892                 create_lock_applied = 0;
12893         }
12894         /* Is the stream no. valid? */
12895         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12896                 /* Invalid stream number */
12897                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12898                 error = EINVAL;
12899                 goto out_unlocked;
12900         }
12901         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12902             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12903                 /*
12904                  * Can't queue any data while stream reset is underway.
12905                  */
12906                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12907                         error = EAGAIN;
12908                 } else {
12909                         error = EINVAL;
12910                 }
12911                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12912                 goto out_unlocked;
12913         }
12914         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12915             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12916                 queue_only = 1;
12917         }
12918         /* we are now done with all control */
12919         if (control) {
12920                 sctp_m_freem(control);
12921                 control = NULL;
12922         }
12923         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12924             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12925             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12926             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12927                 if (srcv->sinfo_flags & SCTP_ABORT) {
12928                         ;
12929                 } else {
12930                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12931                         error = ECONNRESET;
12932                         goto out_unlocked;
12933                 }
12934         }
12935         /* Ok, we will attempt a msgsnd :> */
12936         if (p) {
12937                 p->td_ru.ru_msgsnd++;
12938         }
12939         /* Are we aborting? */
12940         if (srcv->sinfo_flags & SCTP_ABORT) {
12941                 struct mbuf *mm;
12942                 int tot_demand, tot_out = 0, max_out;
12943
12944                 SCTP_STAT_INCR(sctps_sends_with_abort);
12945                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12946                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12947                         /* It has to be up before we abort */
12948                         /* how big is the user initiated abort? */
12949                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12950                         error = EINVAL;
12951                         goto out;
12952                 }
12953                 if (hold_tcblock) {
12954                         SCTP_TCB_UNLOCK(stcb);
12955                         hold_tcblock = 0;
12956                 }
12957                 if (top) {
12958                         struct mbuf *cntm = NULL;
12959
12960                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12961                         if (sndlen != 0) {
12962                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12963                                         tot_out += SCTP_BUF_LEN(cntm);
12964                                 }
12965                         }
12966                 } else {
12967                         /* Must fit in a MTU */
12968                         tot_out = sndlen;
12969                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12970                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12971                                 /* To big */
12972                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12973                                 error = EMSGSIZE;
12974                                 goto out;
12975                         }
12976                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12977                 }
12978                 if (mm == NULL) {
12979                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12980                         error = ENOMEM;
12981                         goto out;
12982                 }
12983                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12984                 max_out -= sizeof(struct sctp_abort_msg);
12985                 if (tot_out > max_out) {
12986                         tot_out = max_out;
12987                 }
12988                 if (mm) {
12989                         struct sctp_paramhdr *ph;
12990
12991                         /* now move forward the data pointer */
12992                         ph = mtod(mm, struct sctp_paramhdr *);
12993                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12994                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12995                         ph++;
12996                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12997                         if (top == NULL) {
12998                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12999                                 if (error) {
13000                                         /*-
13001                                          * Here if we can't get his data we
13002                                          * still abort we just don't get to
13003                                          * send the users note :-0
13004                                          */
13005                                         sctp_m_freem(mm);
13006                                         mm = NULL;
13007                                 }
13008                         } else {
13009                                 if (sndlen != 0) {
13010                                         SCTP_BUF_NEXT(mm) = top;
13011                                 }
13012                         }
13013                 }
13014                 if (hold_tcblock == 0) {
13015                         SCTP_TCB_LOCK(stcb);
13016                 }
13017                 atomic_add_int(&stcb->asoc.refcnt, -1);
13018                 free_cnt_applied = 0;
13019                 /* release this lock, otherwise we hang on ourselves */
13020                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13021                 /* now relock the stcb so everything is sane */
13022                 hold_tcblock = 0;
13023                 stcb = NULL;
13024                 /*
13025                  * In this case top is already chained to mm avoid double
13026                  * free, since we free it below if top != NULL and driver
13027                  * would free it after sending the packet out
13028                  */
13029                 if (sndlen != 0) {
13030                         top = NULL;
13031                 }
13032                 goto out_unlocked;
13033         }
13034         /* Calculate the maximum we can send */
13035         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13036         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13037                 if (non_blocking) {
13038                         /* we already checked for non-blocking above. */
13039                         max_len = sndlen;
13040                 } else {
13041                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13042                 }
13043         } else {
13044                 max_len = 0;
13045         }
13046         if (hold_tcblock) {
13047                 SCTP_TCB_UNLOCK(stcb);
13048                 hold_tcblock = 0;
13049         }
13050         if (asoc->strmout == NULL) {
13051                 /* huh? software error */
13052                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13053                 error = EFAULT;
13054                 goto out_unlocked;
13055         }
13056
13057         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13058         if ((user_marks_eor == 0) &&
13059             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13060                 /* It will NEVER fit */
13061                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13062                 error = EMSGSIZE;
13063                 goto out_unlocked;
13064         }
13065         if ((uio == NULL) && user_marks_eor) {
13066                 /*-
13067                  * We do not support eeor mode for
13068                  * sending with mbuf chains (like sendfile).
13069                  */
13070                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13071                 error = EINVAL;
13072                 goto out_unlocked;
13073         }
13074
13075         if (user_marks_eor) {
13076                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13077         } else {
13078                 /*-
13079                  * For non-eeor the whole message must fit in
13080                  * the socket send buffer.
13081                  */
13082                 local_add_more = sndlen;
13083         }
13084         len = 0;
13085         if (non_blocking) {
13086                 goto skip_preblock;
13087         }
13088         if (((max_len <= local_add_more) &&
13089             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13090             (max_len == 0) ||
13091             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13092                 /* No room right now ! */
13093                 SOCKBUF_LOCK(&so->so_snd);
13094                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13095                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13096                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13097                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13098                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13099                             inqueue_bytes,
13100                             local_add_more,
13101                             stcb->asoc.stream_queue_cnt,
13102                             stcb->asoc.chunks_on_out_queue,
13103                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13104                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13105                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13106                         }
13107                         be.error = 0;
13108                         stcb->block_entry = &be;
13109                         error = sbwait(&so->so_snd);
13110                         stcb->block_entry = NULL;
13111                         if (error || so->so_error || be.error) {
13112                                 if (error == 0) {
13113                                         if (so->so_error)
13114                                                 error = so->so_error;
13115                                         if (be.error) {
13116                                                 error = be.error;
13117                                         }
13118                                 }
13119                                 SOCKBUF_UNLOCK(&so->so_snd);
13120                                 goto out_unlocked;
13121                         }
13122                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13123                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13124                                     asoc, stcb->asoc.total_output_queue_size);
13125                         }
13126                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13127                                 SOCKBUF_UNLOCK(&so->so_snd);
13128                                 goto out_unlocked;
13129                         }
13130                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13131                 }
13132                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13133                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13134                 } else {
13135                         max_len = 0;
13136                 }
13137                 SOCKBUF_UNLOCK(&so->so_snd);
13138         }
13139
13140 skip_preblock:
13141         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13142                 goto out_unlocked;
13143         }
13144         /*
13145          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13146          * case NOTE: uio will be null when top/mbuf is passed
13147          */
13148         if (sndlen == 0) {
13149                 if (srcv->sinfo_flags & SCTP_EOF) {
13150                         got_all_of_the_send = 1;
13151                         goto dataless_eof;
13152                 } else {
13153                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13154                         error = EINVAL;
13155                         goto out;
13156                 }
13157         }
13158         if (top == NULL) {
13159                 struct sctp_stream_queue_pending *sp;
13160                 struct sctp_stream_out *strm;
13161                 uint32_t sndout;
13162
13163                 SCTP_TCB_SEND_LOCK(stcb);
13164                 if ((asoc->stream_locked) &&
13165                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13166                         SCTP_TCB_SEND_UNLOCK(stcb);
13167                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13168                         error = EINVAL;
13169                         goto out;
13170                 }
13171                 SCTP_TCB_SEND_UNLOCK(stcb);
13172
13173                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13174                 if (strm->last_msg_incomplete == 0) {
13175         do_a_copy_in:
13176                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13177                         if (error) {
13178                                 goto out;
13179                         }
13180                         SCTP_TCB_SEND_LOCK(stcb);
13181                         if (sp->msg_is_complete) {
13182                                 strm->last_msg_incomplete = 0;
13183                                 asoc->stream_locked = 0;
13184                         } else {
13185                                 /*
13186                                  * Just got locked to this guy in case of an
13187                                  * interrupt.
13188                                  */
13189                                 strm->last_msg_incomplete = 1;
13190                                 if (stcb->asoc.idata_supported == 0) {
13191                                         asoc->stream_locked = 1;
13192                                         asoc->stream_locked_on = srcv->sinfo_stream;
13193                                 }
13194                                 sp->sender_all_done = 0;
13195                         }
13196                         sctp_snd_sb_alloc(stcb, sp->length);
13197                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13198                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13199                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13200                         }
13201                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13202                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13203                         SCTP_TCB_SEND_UNLOCK(stcb);
13204                 } else {
13205                         SCTP_TCB_SEND_LOCK(stcb);
13206                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13207                         SCTP_TCB_SEND_UNLOCK(stcb);
13208                         if (sp == NULL) {
13209                                 /* ???? Huh ??? last msg is gone */
13210 #ifdef INVARIANTS
13211                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13212 #else
13213                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13214                                 strm->last_msg_incomplete = 0;
13215 #endif
13216                                 goto do_a_copy_in;
13217
13218                         }
13219                 }
13220                 while (uio->uio_resid > 0) {
13221                         /* How much room do we have? */
13222                         struct mbuf *new_tail, *mm;
13223
13224                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13225                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13226                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13227                         else
13228                                 max_len = 0;
13229
13230                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13231                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13232                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13233                                 sndout = 0;
13234                                 new_tail = NULL;
13235                                 if (hold_tcblock) {
13236                                         SCTP_TCB_UNLOCK(stcb);
13237                                         hold_tcblock = 0;
13238                                 }
13239                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13240                                 if ((mm == NULL) || error) {
13241                                         if (mm) {
13242                                                 sctp_m_freem(mm);
13243                                         }
13244                                         goto out;
13245                                 }
13246                                 /* Update the mbuf and count */
13247                                 SCTP_TCB_SEND_LOCK(stcb);
13248                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13249                                         /*
13250                                          * we need to get out. Peer probably
13251                                          * aborted.
13252                                          */
13253                                         sctp_m_freem(mm);
13254                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13255                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13256                                                 error = ECONNRESET;
13257                                         }
13258                                         SCTP_TCB_SEND_UNLOCK(stcb);
13259                                         goto out;
13260                                 }
13261                                 if (sp->tail_mbuf) {
13262                                         /* tack it to the end */
13263                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13264                                         sp->tail_mbuf = new_tail;
13265                                 } else {
13266                                         /* A stolen mbuf */
13267                                         sp->data = mm;
13268                                         sp->tail_mbuf = new_tail;
13269                                 }
13270                                 sctp_snd_sb_alloc(stcb, sndout);
13271                                 atomic_add_int(&sp->length, sndout);
13272                                 len += sndout;
13273                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13274                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13275                                 }
13276
13277                                 /* Did we reach EOR? */
13278                                 if ((uio->uio_resid == 0) &&
13279                                     ((user_marks_eor == 0) ||
13280                                     (srcv->sinfo_flags & SCTP_EOF) ||
13281                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13282                                         sp->msg_is_complete = 1;
13283                                 } else {
13284                                         sp->msg_is_complete = 0;
13285                                 }
13286                                 SCTP_TCB_SEND_UNLOCK(stcb);
13287                         }
13288                         if (uio->uio_resid == 0) {
13289                                 /* got it all? */
13290                                 continue;
13291                         }
13292                         /* PR-SCTP? */
13293                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13294                                 /*
13295                                  * This is ugly but we must assure locking
13296                                  * order
13297                                  */
13298                                 if (hold_tcblock == 0) {
13299                                         SCTP_TCB_LOCK(stcb);
13300                                         hold_tcblock = 1;
13301                                 }
13302                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13303                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13304                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13305                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13306                                 else
13307                                         max_len = 0;
13308                                 if (max_len > 0) {
13309                                         continue;
13310                                 }
13311                                 SCTP_TCB_UNLOCK(stcb);
13312                                 hold_tcblock = 0;
13313                         }
13314                         /* wait for space now */
13315                         if (non_blocking) {
13316                                 /* Non-blocking io in place out */
13317                                 goto skip_out_eof;
13318                         }
13319                         /* What about the INIT, send it maybe */
13320                         if (queue_only_for_init) {
13321                                 if (hold_tcblock == 0) {
13322                                         SCTP_TCB_LOCK(stcb);
13323                                         hold_tcblock = 1;
13324                                 }
13325                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13326                                         /* a collision took us forward? */
13327                                         queue_only = 0;
13328                                 } else {
13329                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13330                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13331                                         queue_only = 1;
13332                                 }
13333                         }
13334                         if ((net->flight_size > net->cwnd) &&
13335                             (asoc->sctp_cmt_on_off == 0)) {
13336                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13337                                 queue_only = 1;
13338                         } else if (asoc->ifp_had_enobuf) {
13339                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13340                                 if (net->flight_size > (2 * net->mtu)) {
13341                                         queue_only = 1;
13342                                 }
13343                                 asoc->ifp_had_enobuf = 0;
13344                         }
13345                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13346                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13347                             (stcb->asoc.total_flight > 0) &&
13348                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13349                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13350
13351                                 /*-
13352                                  * Ok, Nagle is set on and we have data outstanding.
13353                                  * Don't send anything and let SACKs drive out the
13354                                  * data unless we have a "full" segment to send.
13355                                  */
13356                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13357                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13358                                 }
13359                                 SCTP_STAT_INCR(sctps_naglequeued);
13360                                 nagle_applies = 1;
13361                         } else {
13362                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13363                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13364                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13365                                 }
13366                                 SCTP_STAT_INCR(sctps_naglesent);
13367                                 nagle_applies = 0;
13368                         }
13369                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13370
13371                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13372                                     nagle_applies, un_sent);
13373                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13374                                     stcb->asoc.total_flight,
13375                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13376                         }
13377                         if (queue_only_for_init)
13378                                 queue_only_for_init = 0;
13379                         if ((queue_only == 0) && (nagle_applies == 0)) {
13380                                 /*-
13381                                  * need to start chunk output
13382                                  * before blocking.. note that if
13383                                  * a lock is already applied, then
13384                                  * the input via the net is happening
13385                                  * and I don't need to start output :-D
13386                                  */
13387                                 if (hold_tcblock == 0) {
13388                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13389                                                 hold_tcblock = 1;
13390                                                 sctp_chunk_output(inp,
13391                                                     stcb,
13392                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13393                                         }
13394                                 } else {
13395                                         sctp_chunk_output(inp,
13396                                             stcb,
13397                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13398                                 }
13399                                 if (hold_tcblock == 1) {
13400                                         SCTP_TCB_UNLOCK(stcb);
13401                                         hold_tcblock = 0;
13402                                 }
13403                         }
13404                         SOCKBUF_LOCK(&so->so_snd);
13405                         /*-
13406                          * This is a bit strange, but I think it will
13407                          * work. The total_output_queue_size is locked and
13408                          * protected by the TCB_LOCK, which we just released.
13409                          * There is a race that can occur between releasing it
13410                          * above, and me getting the socket lock, where sacks
13411                          * come in but we have not put the SB_WAIT on the
13412                          * so_snd buffer to get the wakeup. After the LOCK
13413                          * is applied the sack_processing will also need to
13414                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13415                          * once we have the socket buffer lock if we recheck the
13416                          * size we KNOW we will get to sleep safely with the
13417                          * wakeup flag in place.
13418                          */
13419                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13420                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13421                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13422                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13423                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13424                                             asoc, (size_t)uio->uio_resid);
13425                                 }
13426                                 be.error = 0;
13427                                 stcb->block_entry = &be;
13428                                 error = sbwait(&so->so_snd);
13429                                 stcb->block_entry = NULL;
13430
13431                                 if (error || so->so_error || be.error) {
13432                                         if (error == 0) {
13433                                                 if (so->so_error)
13434                                                         error = so->so_error;
13435                                                 if (be.error) {
13436                                                         error = be.error;
13437                                                 }
13438                                         }
13439                                         SOCKBUF_UNLOCK(&so->so_snd);
13440                                         goto out_unlocked;
13441                                 }
13442
13443                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13444                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13445                                             asoc, stcb->asoc.total_output_queue_size);
13446                                 }
13447                         }
13448                         SOCKBUF_UNLOCK(&so->so_snd);
13449                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13450                                 goto out_unlocked;
13451                         }
13452                 }
13453                 SCTP_TCB_SEND_LOCK(stcb);
13454                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13455                         SCTP_TCB_SEND_UNLOCK(stcb);
13456                         goto out_unlocked;
13457                 }
13458                 if (sp) {
13459                         if (sp->msg_is_complete == 0) {
13460                                 strm->last_msg_incomplete = 1;
13461                                 if (stcb->asoc.idata_supported == 0) {
13462                                         asoc->stream_locked = 1;
13463                                         asoc->stream_locked_on = srcv->sinfo_stream;
13464                                 }
13465                         } else {
13466                                 sp->sender_all_done = 1;
13467                                 strm->last_msg_incomplete = 0;
13468                                 asoc->stream_locked = 0;
13469                         }
13470                 } else {
13471                         SCTP_PRINTF("Huh no sp TSNH?\n");
13472                         strm->last_msg_incomplete = 0;
13473                         asoc->stream_locked = 0;
13474                 }
13475                 SCTP_TCB_SEND_UNLOCK(stcb);
13476                 if (uio->uio_resid == 0) {
13477                         got_all_of_the_send = 1;
13478                 }
13479         } else {
13480                 /* We send in a 0, since we do NOT have any locks */
13481                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13482                 top = NULL;
13483                 if (srcv->sinfo_flags & SCTP_EOF) {
13484                         /*
13485                          * This should only happen for Panda for the mbuf
13486                          * send case, which does NOT yet support EEOR mode.
13487                          * Thus, we can just set this flag to do the proper
13488                          * EOF handling.
13489                          */
13490                         got_all_of_the_send = 1;
13491                 }
13492         }
13493         if (error) {
13494                 goto out;
13495         }
13496 dataless_eof:
13497         /* EOF thing ? */
13498         if ((srcv->sinfo_flags & SCTP_EOF) &&
13499             (got_all_of_the_send == 1)) {
13500                 SCTP_STAT_INCR(sctps_sends_with_eof);
13501                 error = 0;
13502                 if (hold_tcblock == 0) {
13503                         SCTP_TCB_LOCK(stcb);
13504                         hold_tcblock = 1;
13505                 }
13506                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13507                     TAILQ_EMPTY(&asoc->sent_queue) &&
13508                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13509                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13510                                 goto abort_anyway;
13511                         }
13512                         /* there is nothing queued to send, so I'm done... */
13513                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13514                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13515                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13516                                 struct sctp_nets *netp;
13517
13518                                 /* only send SHUTDOWN the first time through */
13519                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13520                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13521                                 }
13522                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13523                                 sctp_stop_timers_for_shutdown(stcb);
13524                                 if (stcb->asoc.alternate) {
13525                                         netp = stcb->asoc.alternate;
13526                                 } else {
13527                                         netp = stcb->asoc.primary_destination;
13528                                 }
13529                                 sctp_send_shutdown(stcb, netp);
13530                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13531                                     netp);
13532                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13533                                     asoc->primary_destination);
13534                         }
13535                 } else {
13536                         /*-
13537                          * we still got (or just got) data to send, so set
13538                          * SHUTDOWN_PENDING
13539                          */
13540                         /*-
13541                          * XXX sockets draft says that SCTP_EOF should be
13542                          * sent with no data.  currently, we will allow user
13543                          * data to be sent first and move to
13544                          * SHUTDOWN-PENDING
13545                          */
13546                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13547                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13548                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13549                                 if (hold_tcblock == 0) {
13550                                         SCTP_TCB_LOCK(stcb);
13551                                         hold_tcblock = 1;
13552                                 }
13553                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13554                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13555                                 }
13556                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13557                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13558                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13559                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13560                                         struct mbuf *op_err;
13561                                         char msg[SCTP_DIAG_INFO_LEN];
13562
13563                         abort_anyway:
13564                                         if (free_cnt_applied) {
13565                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13566                                                 free_cnt_applied = 0;
13567                                         }
13568                                         snprintf(msg, sizeof(msg),
13569                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13570                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13571                                             msg);
13572                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13573                                             op_err, SCTP_SO_LOCKED);
13574                                         /*
13575                                          * now relock the stcb so everything
13576                                          * is sane
13577                                          */
13578                                         hold_tcblock = 0;
13579                                         stcb = NULL;
13580                                         goto out;
13581                                 }
13582                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13583                                     asoc->primary_destination);
13584                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13585                         }
13586                 }
13587         }
13588 skip_out_eof:
13589         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13590                 some_on_control = 1;
13591         }
13592         if (queue_only_for_init) {
13593                 if (hold_tcblock == 0) {
13594                         SCTP_TCB_LOCK(stcb);
13595                         hold_tcblock = 1;
13596                 }
13597                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13598                         /* a collision took us forward? */
13599                         queue_only = 0;
13600                 } else {
13601                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13602                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13603                         queue_only = 1;
13604                 }
13605         }
13606         if ((net->flight_size > net->cwnd) &&
13607             (stcb->asoc.sctp_cmt_on_off == 0)) {
13608                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13609                 queue_only = 1;
13610         } else if (asoc->ifp_had_enobuf) {
13611                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13612                 if (net->flight_size > (2 * net->mtu)) {
13613                         queue_only = 1;
13614                 }
13615                 asoc->ifp_had_enobuf = 0;
13616         }
13617         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13618         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13619             (stcb->asoc.total_flight > 0) &&
13620             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13621             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13622                 /*-
13623                  * Ok, Nagle is set on and we have data outstanding.
13624                  * Don't send anything and let SACKs drive out the
13625                  * data unless wen have a "full" segment to send.
13626                  */
13627                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13628                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13629                 }
13630                 SCTP_STAT_INCR(sctps_naglequeued);
13631                 nagle_applies = 1;
13632         } else {
13633                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13634                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13635                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13636                 }
13637                 SCTP_STAT_INCR(sctps_naglesent);
13638                 nagle_applies = 0;
13639         }
13640         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13641                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13642                     nagle_applies, un_sent);
13643                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13644                     stcb->asoc.total_flight,
13645                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13646         }
13647         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13648                 /* we can attempt to send too. */
13649                 if (hold_tcblock == 0) {
13650                         /*
13651                          * If there is activity recv'ing sacks no need to
13652                          * send
13653                          */
13654                         if (SCTP_TCB_TRYLOCK(stcb)) {
13655                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13656                                 hold_tcblock = 1;
13657                         }
13658                 } else {
13659                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13660                 }
13661         } else if ((queue_only == 0) &&
13662                     (stcb->asoc.peers_rwnd == 0) &&
13663             (stcb->asoc.total_flight == 0)) {
13664                 /* We get to have a probe outstanding */
13665                 if (hold_tcblock == 0) {
13666                         hold_tcblock = 1;
13667                         SCTP_TCB_LOCK(stcb);
13668                 }
13669                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13670         } else if (some_on_control) {
13671                 int num_out, reason, frag_point;
13672
13673                 /* Here we do control only */
13674                 if (hold_tcblock == 0) {
13675                         hold_tcblock = 1;
13676                         SCTP_TCB_LOCK(stcb);
13677                 }
13678                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13679                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13680                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13681         }
13682         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13683             queue_only, stcb->asoc.peers_rwnd, un_sent,
13684             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13685             stcb->asoc.total_output_queue_size, error);
13686
13687 out:
13688 out_unlocked:
13689
13690         if (local_soresv && stcb) {
13691                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13692         }
13693         if (create_lock_applied) {
13694                 SCTP_ASOC_CREATE_UNLOCK(inp);
13695         }
13696         if ((stcb) && hold_tcblock) {
13697                 SCTP_TCB_UNLOCK(stcb);
13698         }
13699         if (stcb && free_cnt_applied) {
13700                 atomic_add_int(&stcb->asoc.refcnt, -1);
13701         }
13702 #ifdef INVARIANTS
13703         if (stcb) {
13704                 if (mtx_owned(&stcb->tcb_mtx)) {
13705                         panic("Leaving with tcb mtx owned?");
13706                 }
13707                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13708                         panic("Leaving with tcb send mtx owned?");
13709                 }
13710         }
13711 #endif
13712         if (top) {
13713                 sctp_m_freem(top);
13714         }
13715         if (control) {
13716                 sctp_m_freem(control);
13717         }
13718         return (error);
13719 }
13720
13721
13722 /*
13723  * generate an AUTHentication chunk, if required
13724  */
13725 struct mbuf *
13726 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13727     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13728     struct sctp_tcb *stcb, uint8_t chunk)
13729 {
13730         struct mbuf *m_auth;
13731         struct sctp_auth_chunk *auth;
13732         int chunk_len;
13733         struct mbuf *cn;
13734
13735         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13736             (stcb == NULL))
13737                 return (m);
13738
13739         if (stcb->asoc.auth_supported == 0) {
13740                 return (m);
13741         }
13742         /* does the requested chunk require auth? */
13743         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13744                 return (m);
13745         }
13746         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13747         if (m_auth == NULL) {
13748                 /* no mbuf's */
13749                 return (m);
13750         }
13751         /* reserve some space if this will be the first mbuf */
13752         if (m == NULL)
13753                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13754         /* fill in the AUTH chunk details */
13755         auth = mtod(m_auth, struct sctp_auth_chunk *);
13756         memset(auth, 0, sizeof(*auth));
13757         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13758         auth->ch.chunk_flags = 0;
13759         chunk_len = sizeof(*auth) +
13760             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13761         auth->ch.chunk_length = htons(chunk_len);
13762         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13763         /* key id and hmac digest will be computed and filled in upon send */
13764
13765         /* save the offset where the auth was inserted into the chain */
13766         *offset = 0;
13767         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13768                 *offset += SCTP_BUF_LEN(cn);
13769         }
13770
13771         /* update length and return pointer to the auth chunk */
13772         SCTP_BUF_LEN(m_auth) = chunk_len;
13773         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13774         if (auth_ret != NULL)
13775                 *auth_ret = auth;
13776
13777         return (m);
13778 }
13779
13780 #ifdef INET6
13781 int
13782 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13783 {
13784         struct nd_prefix *pfx = NULL;
13785         struct nd_pfxrouter *pfxrtr = NULL;
13786         struct sockaddr_in6 gw6;
13787
13788         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13789                 return (0);
13790
13791         /* get prefix entry of address */
13792         ND6_RLOCK();
13793         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13794                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13795                         continue;
13796                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13797                     &src6->sin6_addr, &pfx->ndpr_mask))
13798                         break;
13799         }
13800         /* no prefix entry in the prefix list */
13801         if (pfx == NULL) {
13802                 ND6_RUNLOCK();
13803                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13804                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13805                 return (0);
13806         }
13807
13808         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13809         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13810
13811         /* search installed gateway from prefix entry */
13812         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13813                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13814                 gw6.sin6_family = AF_INET6;
13815                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13816                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13817                     sizeof(struct in6_addr));
13818                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13819                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13820                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13821                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13822                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13823                         ND6_RUNLOCK();
13824                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13825                         return (1);
13826                 }
13827         }
13828         ND6_RUNLOCK();
13829         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13830         return (0);
13831 }
13832 #endif
13833
13834 int
13835 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13836 {
13837 #ifdef INET
13838         struct sockaddr_in *sin, *mask;
13839         struct ifaddr *ifa;
13840         struct in_addr srcnetaddr, gwnetaddr;
13841
13842         if (ro == NULL || ro->ro_rt == NULL ||
13843             sifa->address.sa.sa_family != AF_INET) {
13844                 return (0);
13845         }
13846         ifa = (struct ifaddr *)sifa->ifa;
13847         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13848         sin = &sifa->address.sin;
13849         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13850         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13851         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13852         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13853
13854         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13855         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13856         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13857         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13858         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13859         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13860                 return (1);
13861         }
13862 #endif
13863         return (0);
13864 }