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         struct sctp_initmsg initmsg;
3576 #ifdef INET
3577         struct sockaddr_in sin;
3578 #endif
3579 #ifdef INET6
3580         struct sockaddr_in6 sin6;
3581 #endif
3582         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3583
3584         tot_len = SCTP_BUF_LEN(control);
3585         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3586                 rem_len = tot_len - off;
3587                 if (rem_len < (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, off, 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 ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3599                         /* We don't have the complete CMSG. */
3600                         *error = EINVAL;
3601                         return (1);
3602                 }
3603                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3604                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3605                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3606                         switch (cmh.cmsg_type) {
3607                         case SCTP_INIT:
3608                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3609                                         *error = EINVAL;
3610                                         return (1);
3611                                 }
3612                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3613                                 if (initmsg.sinit_max_attempts)
3614                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3615                                 if (initmsg.sinit_num_ostreams)
3616                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3617                                 if (initmsg.sinit_max_instreams)
3618                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3619                                 if (initmsg.sinit_max_init_timeo)
3620                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3621                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3622                                         struct sctp_stream_out *tmp_str;
3623                                         unsigned int i;
3624 #if defined(SCTP_DETAILED_STR_STATS)
3625                                         int j;
3626 #endif
3627
3628                                         /* Default is NOT correct */
3629                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3630                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3631                                         SCTP_TCB_UNLOCK(stcb);
3632                                         SCTP_MALLOC(tmp_str,
3633                                             struct sctp_stream_out *,
3634                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3635                                             SCTP_M_STRMO);
3636                                         SCTP_TCB_LOCK(stcb);
3637                                         if (tmp_str != NULL) {
3638                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3639                                                 stcb->asoc.strmout = tmp_str;
3640                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3641                                         } else {
3642                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3643                                         }
3644                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3645                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3646                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3647                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3648                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3649 #if defined(SCTP_DETAILED_STR_STATS)
3650                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3651                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3652                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3653                                                 }
3654 #else
3655                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3656                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3657 #endif
3658                                                 stcb->asoc.strmout[i].sid = i;
3659                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3660                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3661                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3662                                         }
3663                                 }
3664                                 break;
3665 #ifdef INET
3666                         case SCTP_DSTADDRV4:
3667                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3668                                         *error = EINVAL;
3669                                         return (1);
3670                                 }
3671                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3672                                 sin.sin_family = AF_INET;
3673                                 sin.sin_len = sizeof(struct sockaddr_in);
3674                                 sin.sin_port = stcb->rport;
3675                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3676                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3677                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3678                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3683                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3684                                         *error = ENOBUFS;
3685                                         return (1);
3686                                 }
3687                                 break;
3688 #endif
3689 #ifdef INET6
3690                         case SCTP_DSTADDRV6:
3691                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3692                                         *error = EINVAL;
3693                                         return (1);
3694                                 }
3695                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3696                                 sin6.sin6_family = AF_INET6;
3697                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3698                                 sin6.sin6_port = stcb->rport;
3699                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3700                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3701                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3702                                         *error = EINVAL;
3703                                         return (1);
3704                                 }
3705 #ifdef INET
3706                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3707                                         in6_sin6_2_sin(&sin, &sin6);
3708                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3709                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3710                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3711                                                 *error = EINVAL;
3712                                                 return (1);
3713                                         }
3714                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3715                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3716                                                 *error = ENOBUFS;
3717                                                 return (1);
3718                                         }
3719                                 } else
3720 #endif
3721                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3722                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3723                                         *error = ENOBUFS;
3724                                         return (1);
3725                                 }
3726                                 break;
3727 #endif
3728                         default:
3729                                 break;
3730                         }
3731                 }
3732         }
3733         return (0);
3734 }
3735
3736 #if defined(INET) || defined(INET6)
3737 static struct sctp_tcb *
3738 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3739     uint16_t port,
3740     struct mbuf *control,
3741     struct sctp_nets **net_p,
3742     int *error)
3743 {
3744         struct cmsghdr cmh;
3745         struct sctp_tcb *stcb;
3746         struct sockaddr *addr;
3747 #ifdef INET
3748         struct sockaddr_in sin;
3749 #endif
3750 #ifdef INET6
3751         struct sockaddr_in6 sin6;
3752 #endif
3753         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3754
3755         tot_len = SCTP_BUF_LEN(control);
3756         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3757                 rem_len = tot_len - off;
3758                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3759                         /* There is not enough room for one more. */
3760                         *error = EINVAL;
3761                         return (NULL);
3762                 }
3763                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3764                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3765                         /* We dont't have a complete CMSG header. */
3766                         *error = EINVAL;
3767                         return (NULL);
3768                 }
3769                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3770                         /* We don't have the complete CMSG. */
3771                         *error = EINVAL;
3772                         return (NULL);
3773                 }
3774                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3775                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3776                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3777                         switch (cmh.cmsg_type) {
3778 #ifdef INET
3779                         case SCTP_DSTADDRV4:
3780                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3781                                         *error = EINVAL;
3782                                         return (NULL);
3783                                 }
3784                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3785                                 sin.sin_family = AF_INET;
3786                                 sin.sin_len = sizeof(struct sockaddr_in);
3787                                 sin.sin_port = port;
3788                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3789                                 addr = (struct sockaddr *)&sin;
3790                                 break;
3791 #endif
3792 #ifdef INET6
3793                         case SCTP_DSTADDRV6:
3794                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3795                                         *error = EINVAL;
3796                                         return (NULL);
3797                                 }
3798                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3799                                 sin6.sin6_family = AF_INET6;
3800                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3801                                 sin6.sin6_port = port;
3802                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3803 #ifdef INET
3804                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3805                                         in6_sin6_2_sin(&sin, &sin6);
3806                                         addr = (struct sockaddr *)&sin;
3807                                 } else
3808 #endif
3809                                         addr = (struct sockaddr *)&sin6;
3810                                 break;
3811 #endif
3812                         default:
3813                                 addr = NULL;
3814                                 break;
3815                         }
3816                         if (addr) {
3817                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3818                                 if (stcb != NULL) {
3819                                         return (stcb);
3820                                 }
3821                         }
3822                 }
3823         }
3824         return (NULL);
3825 }
3826 #endif
3827
3828 static struct mbuf *
3829 sctp_add_cookie(struct mbuf *init, int init_offset,
3830     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3831 {
3832         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3833         struct sctp_state_cookie *stc;
3834         struct sctp_paramhdr *ph;
3835         uint8_t *foo;
3836         int sig_offset;
3837         uint16_t cookie_sz;
3838
3839         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3840             sizeof(struct sctp_paramhdr)), 0,
3841             M_NOWAIT, 1, MT_DATA);
3842         if (mret == NULL) {
3843                 return (NULL);
3844         }
3845         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3846         if (copy_init == NULL) {
3847                 sctp_m_freem(mret);
3848                 return (NULL);
3849         }
3850 #ifdef SCTP_MBUF_LOGGING
3851         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3852                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3853         }
3854 #endif
3855         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3856             M_NOWAIT);
3857         if (copy_initack == NULL) {
3858                 sctp_m_freem(mret);
3859                 sctp_m_freem(copy_init);
3860                 return (NULL);
3861         }
3862 #ifdef SCTP_MBUF_LOGGING
3863         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3864                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3865         }
3866 #endif
3867         /* easy side we just drop it on the end */
3868         ph = mtod(mret, struct sctp_paramhdr *);
3869         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3870             sizeof(struct sctp_paramhdr);
3871         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3872             sizeof(struct sctp_paramhdr));
3873         ph->param_type = htons(SCTP_STATE_COOKIE);
3874         ph->param_length = 0;   /* fill in at the end */
3875         /* Fill in the stc cookie data */
3876         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3877
3878         /* tack the INIT and then the INIT-ACK onto the chain */
3879         cookie_sz = 0;
3880         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881                 cookie_sz += SCTP_BUF_LEN(m_at);
3882                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3883                         SCTP_BUF_NEXT(m_at) = copy_init;
3884                         break;
3885                 }
3886         }
3887         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888                 cookie_sz += SCTP_BUF_LEN(m_at);
3889                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3890                         SCTP_BUF_NEXT(m_at) = copy_initack;
3891                         break;
3892                 }
3893         }
3894         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3895                 cookie_sz += SCTP_BUF_LEN(m_at);
3896                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3897                         break;
3898                 }
3899         }
3900         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3901         if (sig == NULL) {
3902                 /* no space, so free the entire chain */
3903                 sctp_m_freem(mret);
3904                 return (NULL);
3905         }
3906         SCTP_BUF_LEN(sig) = 0;
3907         SCTP_BUF_NEXT(m_at) = sig;
3908         sig_offset = 0;
3909         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3910         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3911         *signature = foo;
3912         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3913         cookie_sz += SCTP_SIGNATURE_SIZE;
3914         ph->param_length = htons(cookie_sz);
3915         return (mret);
3916 }
3917
3918
3919 static uint8_t
3920 sctp_get_ect(struct sctp_tcb *stcb)
3921 {
3922         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3923                 return (SCTP_ECT0_BIT);
3924         } else {
3925                 return (0);
3926         }
3927 }
3928
3929 #if defined(INET) || defined(INET6)
3930 static void
3931 sctp_handle_no_route(struct sctp_tcb *stcb,
3932     struct sctp_nets *net,
3933     int so_locked)
3934 {
3935         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3936
3937         if (net) {
3938                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3939                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3940                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3941                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3942                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3943                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3944                                     stcb, 0,
3945                                     (void *)net,
3946                                     so_locked);
3947                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3948                                 net->dest_state &= ~SCTP_ADDR_PF;
3949                         }
3950                 }
3951                 if (stcb) {
3952                         if (net == stcb->asoc.primary_destination) {
3953                                 /* need a new primary */
3954                                 struct sctp_nets *alt;
3955
3956                                 alt = sctp_find_alternate_net(stcb, net, 0);
3957                                 if (alt != net) {
3958                                         if (stcb->asoc.alternate) {
3959                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3960                                         }
3961                                         stcb->asoc.alternate = alt;
3962                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3963                                         if (net->ro._s_addr) {
3964                                                 sctp_free_ifa(net->ro._s_addr);
3965                                                 net->ro._s_addr = NULL;
3966                                         }
3967                                         net->src_addr_selected = 0;
3968                                 }
3969                         }
3970                 }
3971         }
3972 }
3973 #endif
3974
3975 static int
3976 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3977     struct sctp_tcb *stcb,      /* may be NULL */
3978     struct sctp_nets *net,
3979     struct sockaddr *to,
3980     struct mbuf *m,
3981     uint32_t auth_offset,
3982     struct sctp_auth_chunk *auth,
3983     uint16_t auth_keyid,
3984     int nofragment_flag,
3985     int ecn_ok,
3986     int out_of_asoc_ok,
3987     uint16_t src_port,
3988     uint16_t dest_port,
3989     uint32_t v_tag,
3990     uint16_t port,
3991     union sctp_sockstore *over_addr,
3992     uint8_t mflowtype, uint32_t mflowid,
3993 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3994     int so_locked SCTP_UNUSED
3995 #else
3996     int so_locked
3997 #endif
3998 )
3999 {
4000 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4001         /**
4002          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4003          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4004          * - fill in the HMAC digest of any AUTH chunk in the packet.
4005          * - calculate and fill in the SCTP checksum.
4006          * - prepend an IP address header.
4007          * - if boundall use INADDR_ANY.
4008          * - if boundspecific do source address selection.
4009          * - set fragmentation option for ipV4.
4010          * - On return from IP output, check/adjust mtu size of output
4011          *   interface and smallest_mtu size as well.
4012          */
4013         /* Will need ifdefs around this */
4014         struct mbuf *newm;
4015         struct sctphdr *sctphdr;
4016         int packet_length;
4017         int ret;
4018 #if defined(INET) || defined(INET6)
4019         uint32_t vrf_id;
4020 #endif
4021 #if defined(INET) || defined(INET6)
4022         struct mbuf *o_pak;
4023         sctp_route_t *ro = NULL;
4024         struct udphdr *udp = NULL;
4025 #endif
4026         uint8_t tos_value;
4027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028         struct socket *so = NULL;
4029 #endif
4030
4031         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4032                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4033                 sctp_m_freem(m);
4034                 return (EFAULT);
4035         }
4036 #if defined(INET) || defined(INET6)
4037         if (stcb) {
4038                 vrf_id = stcb->asoc.vrf_id;
4039         } else {
4040                 vrf_id = inp->def_vrf_id;
4041         }
4042 #endif
4043         /* fill in the HMAC digest for any AUTH chunk in the packet */
4044         if ((auth != NULL) && (stcb != NULL)) {
4045                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4046         }
4047
4048         if (net) {
4049                 tos_value = net->dscp;
4050         } else if (stcb) {
4051                 tos_value = stcb->asoc.default_dscp;
4052         } else {
4053                 tos_value = inp->sctp_ep.default_dscp;
4054         }
4055
4056         switch (to->sa_family) {
4057 #ifdef INET
4058         case AF_INET:
4059                 {
4060                         struct ip *ip = NULL;
4061                         sctp_route_t iproute;
4062                         int len;
4063
4064                         len = SCTP_MIN_V4_OVERHEAD;
4065                         if (port) {
4066                                 len += sizeof(struct udphdr);
4067                         }
4068                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069                         if (newm == NULL) {
4070                                 sctp_m_freem(m);
4071                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072                                 return (ENOMEM);
4073                         }
4074                         SCTP_ALIGN_TO_END(newm, len);
4075                         SCTP_BUF_LEN(newm) = len;
4076                         SCTP_BUF_NEXT(newm) = m;
4077                         m = newm;
4078                         if (net != NULL) {
4079                                 m->m_pkthdr.flowid = net->flowid;
4080                                 M_HASHTYPE_SET(m, net->flowtype);
4081                         } else {
4082                                 m->m_pkthdr.flowid = mflowid;
4083                                 M_HASHTYPE_SET(m, mflowtype);
4084                         }
4085                         packet_length = sctp_calculate_len(m);
4086                         ip = mtod(m, struct ip *);
4087                         ip->ip_v = IPVERSION;
4088                         ip->ip_hl = (sizeof(struct ip) >> 2);
4089                         if (tos_value == 0) {
4090                                 /*
4091                                  * This means especially, that it is not set
4092                                  * at the SCTP layer. So use the value from
4093                                  * the IP layer.
4094                                  */
4095                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4096                         }
4097                         tos_value &= 0xfc;
4098                         if (ecn_ok) {
4099                                 tos_value |= sctp_get_ect(stcb);
4100                         }
4101                         if ((nofragment_flag) && (port == 0)) {
4102                                 ip->ip_off = htons(IP_DF);
4103                         } else {
4104                                 ip->ip_off = htons(0);
4105                         }
4106                         /* FreeBSD has a function for ip_id's */
4107                         ip_fillid(ip);
4108
4109                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4110                         ip->ip_len = htons(packet_length);
4111                         ip->ip_tos = tos_value;
4112                         if (port) {
4113                                 ip->ip_p = IPPROTO_UDP;
4114                         } else {
4115                                 ip->ip_p = IPPROTO_SCTP;
4116                         }
4117                         ip->ip_sum = 0;
4118                         if (net == NULL) {
4119                                 ro = &iproute;
4120                                 memset(&iproute, 0, sizeof(iproute));
4121                                 memcpy(&ro->ro_dst, to, to->sa_len);
4122                         } else {
4123                                 ro = (sctp_route_t *)&net->ro;
4124                         }
4125                         /* Now the address selection part */
4126                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4127
4128                         /* call the routine to select the src address */
4129                         if (net && out_of_asoc_ok == 0) {
4130                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4131                                         sctp_free_ifa(net->ro._s_addr);
4132                                         net->ro._s_addr = NULL;
4133                                         net->src_addr_selected = 0;
4134                                         if (ro->ro_rt) {
4135                                                 RTFREE(ro->ro_rt);
4136                                                 ro->ro_rt = NULL;
4137                                         }
4138                                 }
4139                                 if (net->src_addr_selected == 0) {
4140                                         /* Cache the source address */
4141                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4142                                             ro, net, 0,
4143                                             vrf_id);
4144                                         net->src_addr_selected = 1;
4145                                 }
4146                                 if (net->ro._s_addr == NULL) {
4147                                         /* No route to host */
4148                                         net->src_addr_selected = 0;
4149                                         sctp_handle_no_route(stcb, net, so_locked);
4150                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4151                                         sctp_m_freem(m);
4152                                         return (EHOSTUNREACH);
4153                                 }
4154                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4155                         } else {
4156                                 if (over_addr == NULL) {
4157                                         struct sctp_ifa *_lsrc;
4158
4159                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4160                                             net,
4161                                             out_of_asoc_ok,
4162                                             vrf_id);
4163                                         if (_lsrc == NULL) {
4164                                                 sctp_handle_no_route(stcb, net, so_locked);
4165                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4166                                                 sctp_m_freem(m);
4167                                                 return (EHOSTUNREACH);
4168                                         }
4169                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4170                                         sctp_free_ifa(_lsrc);
4171                                 } else {
4172                                         ip->ip_src = over_addr->sin.sin_addr;
4173                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4174                                 }
4175                         }
4176                         if (port) {
4177                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4178                                         sctp_handle_no_route(stcb, net, so_locked);
4179                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4180                                         sctp_m_freem(m);
4181                                         return (EHOSTUNREACH);
4182                                 }
4183                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4184                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4185                                 udp->uh_dport = port;
4186                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4187                                 if (V_udp_cksum) {
4188                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4189                                 } else {
4190                                         udp->uh_sum = 0;
4191                                 }
4192                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4193                         } else {
4194                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4195                         }
4196
4197                         sctphdr->src_port = src_port;
4198                         sctphdr->dest_port = dest_port;
4199                         sctphdr->v_tag = v_tag;
4200                         sctphdr->checksum = 0;
4201
4202                         /*
4203                          * If source address selection fails and we find no
4204                          * route then the ip_output should fail as well with
4205                          * a NO_ROUTE_TO_HOST type error. We probably should
4206                          * catch that somewhere and abort the association
4207                          * right away (assuming this is an INIT being sent).
4208                          */
4209                         if (ro->ro_rt == NULL) {
4210                                 /*
4211                                  * src addr selection failed to find a route
4212                                  * (or valid source addr), so we can't get
4213                                  * there from here (yet)!
4214                                  */
4215                                 sctp_handle_no_route(stcb, net, so_locked);
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4217                                 sctp_m_freem(m);
4218                                 return (EHOSTUNREACH);
4219                         }
4220                         if (ro != &iproute) {
4221                                 memcpy(&iproute, ro, sizeof(*ro));
4222                         }
4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4224                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4225                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4226                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4227                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4228                             (void *)ro->ro_rt);
4229
4230                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4231                                 /* failed to prepend data, give up */
4232                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4233                                 sctp_m_freem(m);
4234                                 return (ENOMEM);
4235                         }
4236                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4237                         if (port) {
4238                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4239                                 SCTP_STAT_INCR(sctps_sendswcrc);
4240                                 if (V_udp_cksum) {
4241                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4242                                 }
4243                         } else {
4244                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4245                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4246                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4247                         }
4248 #ifdef SCTP_PACKET_LOGGING
4249                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4250                                 sctp_packet_log(o_pak);
4251 #endif
4252                         /* send it out.  table id is taken from stcb */
4253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4254                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4255                                 so = SCTP_INP_SO(inp);
4256                                 SCTP_SOCKET_UNLOCK(so, 0);
4257                         }
4258 #endif
4259                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4260                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4262                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4263                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4264                                 SCTP_TCB_UNLOCK(stcb);
4265                                 SCTP_SOCKET_LOCK(so, 0);
4266                                 SCTP_TCB_LOCK(stcb);
4267                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4268                         }
4269 #endif
4270                         if (port) {
4271                                 UDPSTAT_INC(udps_opackets);
4272                         }
4273                         SCTP_STAT_INCR(sctps_sendpackets);
4274                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4275                         if (ret)
4276                                 SCTP_STAT_INCR(sctps_senderrors);
4277
4278                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4279                         if (net == NULL) {
4280                                 /* free tempy routes */
4281                                 RO_RTFREE(ro);
4282                         } else {
4283                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4284                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4285                                         uint32_t mtu;
4286
4287                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4288                                         if (mtu > 0) {
4289                                                 if (net->port) {
4290                                                         mtu -= sizeof(struct udphdr);
4291                                                 }
4292                                                 if (mtu < net->mtu) {
4293                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4294                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4295                                                         }
4296                                                         net->mtu = mtu;
4297                                                 }
4298                                         }
4299                                 } else if (ro->ro_rt == NULL) {
4300                                         /* route was freed */
4301                                         if (net->ro._s_addr &&
4302                                             net->src_addr_selected) {
4303                                                 sctp_free_ifa(net->ro._s_addr);
4304                                                 net->ro._s_addr = NULL;
4305                                         }
4306                                         net->src_addr_selected = 0;
4307                                 }
4308                         }
4309                         return (ret);
4310                 }
4311 #endif
4312 #ifdef INET6
4313         case AF_INET6:
4314                 {
4315                         uint32_t flowlabel, flowinfo;
4316                         struct ip6_hdr *ip6h;
4317                         struct route_in6 ip6route;
4318                         struct ifnet *ifp;
4319                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4320                         int prev_scope = 0;
4321                         struct sockaddr_in6 lsa6_storage;
4322                         int error;
4323                         u_short prev_port = 0;
4324                         int len;
4325
4326                         if (net) {
4327                                 flowlabel = net->flowlabel;
4328                         } else if (stcb) {
4329                                 flowlabel = stcb->asoc.default_flowlabel;
4330                         } else {
4331                                 flowlabel = inp->sctp_ep.default_flowlabel;
4332                         }
4333                         if (flowlabel == 0) {
4334                                 /*
4335                                  * This means especially, that it is not set
4336                                  * at the SCTP layer. So use the value from
4337                                  * the IP layer.
4338                                  */
4339                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4340                         }
4341                         flowlabel &= 0x000fffff;
4342                         len = SCTP_MIN_OVERHEAD;
4343                         if (port) {
4344                                 len += sizeof(struct udphdr);
4345                         }
4346                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4347                         if (newm == NULL) {
4348                                 sctp_m_freem(m);
4349                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4350                                 return (ENOMEM);
4351                         }
4352                         SCTP_ALIGN_TO_END(newm, len);
4353                         SCTP_BUF_LEN(newm) = len;
4354                         SCTP_BUF_NEXT(newm) = m;
4355                         m = newm;
4356                         if (net != NULL) {
4357                                 m->m_pkthdr.flowid = net->flowid;
4358                                 M_HASHTYPE_SET(m, net->flowtype);
4359                         } else {
4360                                 m->m_pkthdr.flowid = mflowid;
4361                                 M_HASHTYPE_SET(m, mflowtype);
4362                         }
4363                         packet_length = sctp_calculate_len(m);
4364
4365                         ip6h = mtod(m, struct ip6_hdr *);
4366                         /* protect *sin6 from overwrite */
4367                         sin6 = (struct sockaddr_in6 *)to;
4368                         tmp = *sin6;
4369                         sin6 = &tmp;
4370
4371                         /* KAME hack: embed scopeid */
4372                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4373                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4374                                 sctp_m_freem(m);
4375                                 return (EINVAL);
4376                         }
4377                         if (net == NULL) {
4378                                 memset(&ip6route, 0, sizeof(ip6route));
4379                                 ro = (sctp_route_t *)&ip6route;
4380                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4381                         } else {
4382                                 ro = (sctp_route_t *)&net->ro;
4383                         }
4384                         /*
4385                          * We assume here that inp_flow is in host byte
4386                          * order within the TCB!
4387                          */
4388                         if (tos_value == 0) {
4389                                 /*
4390                                  * This means especially, that it is not set
4391                                  * at the SCTP layer. So use the value from
4392                                  * the IP layer.
4393                                  */
4394                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4395                         }
4396                         tos_value &= 0xfc;
4397                         if (ecn_ok) {
4398                                 tos_value |= sctp_get_ect(stcb);
4399                         }
4400                         flowinfo = 0x06;
4401                         flowinfo <<= 8;
4402                         flowinfo |= tos_value;
4403                         flowinfo <<= 20;
4404                         flowinfo |= flowlabel;
4405                         ip6h->ip6_flow = htonl(flowinfo);
4406                         if (port) {
4407                                 ip6h->ip6_nxt = IPPROTO_UDP;
4408                         } else {
4409                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4410                         }
4411                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4412                         ip6h->ip6_dst = sin6->sin6_addr;
4413
4414                         /*
4415                          * Add SRC address selection here: we can only reuse
4416                          * to a limited degree the kame src-addr-sel, since
4417                          * we can try their selection but it may not be
4418                          * bound.
4419                          */
4420                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4421                         lsa6_tmp.sin6_family = AF_INET6;
4422                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4423                         lsa6 = &lsa6_tmp;
4424                         if (net && out_of_asoc_ok == 0) {
4425                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4426                                         sctp_free_ifa(net->ro._s_addr);
4427                                         net->ro._s_addr = NULL;
4428                                         net->src_addr_selected = 0;
4429                                         if (ro->ro_rt) {
4430                                                 RTFREE(ro->ro_rt);
4431                                                 ro->ro_rt = NULL;
4432                                         }
4433                                 }
4434                                 if (net->src_addr_selected == 0) {
4435                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4436                                         /* KAME hack: embed scopeid */
4437                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4438                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4439                                                 sctp_m_freem(m);
4440                                                 return (EINVAL);
4441                                         }
4442                                         /* Cache the source address */
4443                                         net->ro._s_addr = sctp_source_address_selection(inp,
4444                                             stcb,
4445                                             ro,
4446                                             net,
4447                                             0,
4448                                             vrf_id);
4449                                         (void)sa6_recoverscope(sin6);
4450                                         net->src_addr_selected = 1;
4451                                 }
4452                                 if (net->ro._s_addr == NULL) {
4453                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4454                                         net->src_addr_selected = 0;
4455                                         sctp_handle_no_route(stcb, net, so_locked);
4456                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4457                                         sctp_m_freem(m);
4458                                         return (EHOSTUNREACH);
4459                                 }
4460                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4461                         } else {
4462                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4463                                 /* KAME hack: embed scopeid */
4464                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4465                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4466                                         sctp_m_freem(m);
4467                                         return (EINVAL);
4468                                 }
4469                                 if (over_addr == NULL) {
4470                                         struct sctp_ifa *_lsrc;
4471
4472                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4473                                             net,
4474                                             out_of_asoc_ok,
4475                                             vrf_id);
4476                                         if (_lsrc == NULL) {
4477                                                 sctp_handle_no_route(stcb, net, so_locked);
4478                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4479                                                 sctp_m_freem(m);
4480                                                 return (EHOSTUNREACH);
4481                                         }
4482                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4483                                         sctp_free_ifa(_lsrc);
4484                                 } else {
4485                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4486                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4487                                 }
4488                                 (void)sa6_recoverscope(sin6);
4489                         }
4490                         lsa6->sin6_port = inp->sctp_lport;
4491
4492                         if (ro->ro_rt == NULL) {
4493                                 /*
4494                                  * src addr selection failed to find a route
4495                                  * (or valid source addr), so we can't get
4496                                  * there from here!
4497                                  */
4498                                 sctp_handle_no_route(stcb, net, so_locked);
4499                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4500                                 sctp_m_freem(m);
4501                                 return (EHOSTUNREACH);
4502                         }
4503                         /*
4504                          * XXX: sa6 may not have a valid sin6_scope_id in
4505                          * the non-SCOPEDROUTING case.
4506                          */
4507                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4508                         lsa6_storage.sin6_family = AF_INET6;
4509                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4510                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4511                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4512                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4513                                 sctp_m_freem(m);
4514                                 return (error);
4515                         }
4516                         /* XXX */
4517                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4518                         lsa6_storage.sin6_port = inp->sctp_lport;
4519                         lsa6 = &lsa6_storage;
4520                         ip6h->ip6_src = lsa6->sin6_addr;
4521
4522                         if (port) {
4523                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4524                                         sctp_handle_no_route(stcb, net, so_locked);
4525                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4526                                         sctp_m_freem(m);
4527                                         return (EHOSTUNREACH);
4528                                 }
4529                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4530                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4531                                 udp->uh_dport = port;
4532                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4533                                 udp->uh_sum = 0;
4534                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4535                         } else {
4536                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4537                         }
4538
4539                         sctphdr->src_port = src_port;
4540                         sctphdr->dest_port = dest_port;
4541                         sctphdr->v_tag = v_tag;
4542                         sctphdr->checksum = 0;
4543
4544                         /*
4545                          * We set the hop limit now since there is a good
4546                          * chance that our ro pointer is now filled
4547                          */
4548                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4549                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4550
4551 #ifdef SCTP_DEBUG
4552                         /* Copy to be sure something bad is not happening */
4553                         sin6->sin6_addr = ip6h->ip6_dst;
4554                         lsa6->sin6_addr = ip6h->ip6_src;
4555 #endif
4556
4557                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4558                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4559                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4560                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4561                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4562                         if (net) {
4563                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4564                                 /*
4565                                  * preserve the port and scope for link
4566                                  * local send
4567                                  */
4568                                 prev_scope = sin6->sin6_scope_id;
4569                                 prev_port = sin6->sin6_port;
4570                         }
4571
4572                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4573                                 /* failed to prepend data, give up */
4574                                 sctp_m_freem(m);
4575                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4576                                 return (ENOMEM);
4577                         }
4578                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4579                         if (port) {
4580                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4581                                 SCTP_STAT_INCR(sctps_sendswcrc);
4582                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4583                                         udp->uh_sum = 0xffff;
4584                                 }
4585                         } else {
4586                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4587                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4588                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4589                         }
4590                         /* send it out. table id is taken from stcb */
4591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4592                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4593                                 so = SCTP_INP_SO(inp);
4594                                 SCTP_SOCKET_UNLOCK(so, 0);
4595                         }
4596 #endif
4597 #ifdef SCTP_PACKET_LOGGING
4598                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4599                                 sctp_packet_log(o_pak);
4600 #endif
4601                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4602                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4604                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4605                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4606                                 SCTP_TCB_UNLOCK(stcb);
4607                                 SCTP_SOCKET_LOCK(so, 0);
4608                                 SCTP_TCB_LOCK(stcb);
4609                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4610                         }
4611 #endif
4612                         if (net) {
4613                                 /* for link local this must be done */
4614                                 sin6->sin6_scope_id = prev_scope;
4615                                 sin6->sin6_port = prev_port;
4616                         }
4617                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4618                         if (port) {
4619                                 UDPSTAT_INC(udps_opackets);
4620                         }
4621                         SCTP_STAT_INCR(sctps_sendpackets);
4622                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4623                         if (ret) {
4624                                 SCTP_STAT_INCR(sctps_senderrors);
4625                         }
4626                         if (net == NULL) {
4627                                 /* Now if we had a temp route free it */
4628                                 RO_RTFREE(ro);
4629                         } else {
4630                                 /*
4631                                  * PMTU check versus smallest asoc MTU goes
4632                                  * here
4633                                  */
4634                                 if (ro->ro_rt == NULL) {
4635                                         /* Route was freed */
4636                                         if (net->ro._s_addr &&
4637                                             net->src_addr_selected) {
4638                                                 sctp_free_ifa(net->ro._s_addr);
4639                                                 net->ro._s_addr = NULL;
4640                                         }
4641                                         net->src_addr_selected = 0;
4642                                 }
4643                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4644                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4645                                         uint32_t mtu;
4646
4647                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4648                                         if (mtu > 0) {
4649                                                 if (net->port) {
4650                                                         mtu -= sizeof(struct udphdr);
4651                                                 }
4652                                                 if (mtu < net->mtu) {
4653                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4654                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4655                                                         }
4656                                                         net->mtu = mtu;
4657                                                 }
4658                                         }
4659                                 } else if (ifp) {
4660                                         if (ND_IFINFO(ifp)->linkmtu &&
4661                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4662                                                 sctp_mtu_size_reset(inp,
4663                                                     &stcb->asoc,
4664                                                     ND_IFINFO(ifp)->linkmtu);
4665                                         }
4666                                 }
4667                         }
4668                         return (ret);
4669                 }
4670 #endif
4671         default:
4672                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4673                     ((struct sockaddr *)to)->sa_family);
4674                 sctp_m_freem(m);
4675                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4676                 return (EFAULT);
4677         }
4678 }
4679
4680
4681 void
4682 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4683 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4684     SCTP_UNUSED
4685 #endif
4686 )
4687 {
4688         struct mbuf *m, *m_last;
4689         struct sctp_nets *net;
4690         struct sctp_init_chunk *init;
4691         struct sctp_supported_addr_param *sup_addr;
4692         struct sctp_adaptation_layer_indication *ali;
4693         struct sctp_supported_chunk_types_param *pr_supported;
4694         struct sctp_paramhdr *ph;
4695         int cnt_inits_to = 0;
4696         int error;
4697         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4698
4699         /* INIT's always go to the primary (and usually ONLY address) */
4700         net = stcb->asoc.primary_destination;
4701         if (net == NULL) {
4702                 net = TAILQ_FIRST(&stcb->asoc.nets);
4703                 if (net == NULL) {
4704                         /* TSNH */
4705                         return;
4706                 }
4707                 /* we confirm any address we send an INIT to */
4708                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4709                 (void)sctp_set_primary_addr(stcb, NULL, net);
4710         } else {
4711                 /* we confirm any address we send an INIT to */
4712                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4713         }
4714         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4715 #ifdef INET6
4716         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4717                 /*
4718                  * special hook, if we are sending to link local it will not
4719                  * show up in our private address count.
4720                  */
4721                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4722                         cnt_inits_to = 1;
4723         }
4724 #endif
4725         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4726                 /* This case should not happen */
4727                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4728                 return;
4729         }
4730         /* start the INIT timer */
4731         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4732
4733         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4734         if (m == NULL) {
4735                 /* No memory, INIT timer will re-attempt. */
4736                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4737                 return;
4738         }
4739         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4740         padding_len = 0;
4741         /* Now lets put the chunk header in place */
4742         init = mtod(m, struct sctp_init_chunk *);
4743         /* now the chunk header */
4744         init->ch.chunk_type = SCTP_INITIATION;
4745         init->ch.chunk_flags = 0;
4746         /* fill in later from mbuf we build */
4747         init->ch.chunk_length = 0;
4748         /* place in my tag */
4749         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4750         /* set up some of the credits. */
4751         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4752             SCTP_MINIMAL_RWND));
4753         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4754         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4755         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4756
4757         /* Adaptation layer indication parameter */
4758         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4759                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4760                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4761                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4762                 ali->ph.param_length = htons(parameter_len);
4763                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4764                 chunk_len += parameter_len;
4765         }
4766
4767         /* ECN parameter */
4768         if (stcb->asoc.ecn_supported == 1) {
4769                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4772                 ph->param_length = htons(parameter_len);
4773                 chunk_len += parameter_len;
4774         }
4775
4776         /* PR-SCTP supported parameter */
4777         if (stcb->asoc.prsctp_supported == 1) {
4778                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4779                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4780                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4781                 ph->param_length = htons(parameter_len);
4782                 chunk_len += parameter_len;
4783         }
4784
4785         /* Add NAT friendly parameter. */
4786         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4787                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4788                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4789                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4790                 ph->param_length = htons(parameter_len);
4791                 chunk_len += parameter_len;
4792         }
4793
4794         /* And now tell the peer which extensions we support */
4795         num_ext = 0;
4796         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4797         if (stcb->asoc.prsctp_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4799                 if (stcb->asoc.idata_supported) {
4800                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4801                 }
4802         }
4803         if (stcb->asoc.auth_supported == 1) {
4804                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4805         }
4806         if (stcb->asoc.asconf_supported == 1) {
4807                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4808                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4809         }
4810         if (stcb->asoc.reconfig_supported == 1) {
4811                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4812         }
4813         if (stcb->asoc.idata_supported) {
4814                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4815         }
4816         if (stcb->asoc.nrsack_supported == 1) {
4817                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4818         }
4819         if (stcb->asoc.pktdrop_supported == 1) {
4820                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4821         }
4822         if (num_ext > 0) {
4823                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4824                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4825                 pr_supported->ph.param_length = htons(parameter_len);
4826                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4827                 chunk_len += parameter_len;
4828         }
4829         /* add authentication parameters */
4830         if (stcb->asoc.auth_supported) {
4831                 /* attach RANDOM parameter, if available */
4832                 if (stcb->asoc.authinfo.random != NULL) {
4833                         struct sctp_auth_random *randp;
4834
4835                         if (padding_len > 0) {
4836                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4837                                 chunk_len += padding_len;
4838                                 padding_len = 0;
4839                         }
4840                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4841                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4842                         /* random key already contains the header */
4843                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4844                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4845                         chunk_len += parameter_len;
4846                 }
4847                 /* add HMAC_ALGO parameter */
4848                 if (stcb->asoc.local_hmacs != NULL) {
4849                         struct sctp_auth_hmac_algo *hmacs;
4850
4851                         if (padding_len > 0) {
4852                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4853                                 chunk_len += padding_len;
4854                                 padding_len = 0;
4855                         }
4856                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4857                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4858                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4859                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4860                         hmacs->ph.param_length = htons(parameter_len);
4861                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4862                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4863                         chunk_len += parameter_len;
4864                 }
4865                 /* add CHUNKS parameter */
4866                 if (stcb->asoc.local_auth_chunks != NULL) {
4867                         struct sctp_auth_chunk_list *chunks;
4868
4869                         if (padding_len > 0) {
4870                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871                                 chunk_len += padding_len;
4872                                 padding_len = 0;
4873                         }
4874                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4875                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4876                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4877                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4878                         chunks->ph.param_length = htons(parameter_len);
4879                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4880                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4881                         chunk_len += parameter_len;
4882                 }
4883         }
4884
4885         /* now any cookie time extensions */
4886         if (stcb->asoc.cookie_preserve_req) {
4887                 struct sctp_cookie_perserve_param *cookie_preserve;
4888
4889                 if (padding_len > 0) {
4890                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4891                         chunk_len += padding_len;
4892                         padding_len = 0;
4893                 }
4894                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4895                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4896                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4897                 cookie_preserve->ph.param_length = htons(parameter_len);
4898                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4899                 stcb->asoc.cookie_preserve_req = 0;
4900                 chunk_len += parameter_len;
4901         }
4902
4903         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4904                 uint8_t i;
4905
4906                 if (padding_len > 0) {
4907                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4908                         chunk_len += padding_len;
4909                         padding_len = 0;
4910                 }
4911                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4912                 if (stcb->asoc.scope.ipv4_addr_legal) {
4913                         parameter_len += (uint16_t)sizeof(uint16_t);
4914                 }
4915                 if (stcb->asoc.scope.ipv6_addr_legal) {
4916                         parameter_len += (uint16_t)sizeof(uint16_t);
4917                 }
4918                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4919                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4920                 sup_addr->ph.param_length = htons(parameter_len);
4921                 i = 0;
4922                 if (stcb->asoc.scope.ipv4_addr_legal) {
4923                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4924                 }
4925                 if (stcb->asoc.scope.ipv6_addr_legal) {
4926                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4927                 }
4928                 padding_len = 4 - 2 * i;
4929                 chunk_len += parameter_len;
4930         }
4931
4932         SCTP_BUF_LEN(m) = chunk_len;
4933         /* now the addresses */
4934         /*
4935          * To optimize this we could put the scoping stuff into a structure
4936          * and remove the individual uint8's from the assoc structure. Then
4937          * we could just sifa in the address within the stcb. But for now
4938          * this is a quick hack to get the address stuff teased apart.
4939          */
4940         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4941             m, cnt_inits_to,
4942             &padding_len, &chunk_len);
4943
4944         init->ch.chunk_length = htons(chunk_len);
4945         if (padding_len > 0) {
4946                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4947                         sctp_m_freem(m);
4948                         return;
4949                 }
4950         }
4951         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4952         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4953             (struct sockaddr *)&net->ro._l_addr,
4954             m, 0, NULL, 0, 0, 0, 0,
4955             inp->sctp_lport, stcb->rport, htonl(0),
4956             net->port, NULL,
4957             0, 0,
4958             so_locked))) {
4959                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4960                 if (error == ENOBUFS) {
4961                         stcb->asoc.ifp_had_enobuf = 1;
4962                         SCTP_STAT_INCR(sctps_lowlevelerr);
4963                 }
4964         } else {
4965                 stcb->asoc.ifp_had_enobuf = 0;
4966         }
4967         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4968         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4969 }
4970
4971 struct mbuf *
4972 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4973     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4974 {
4975         /*
4976          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4977          * being equal to the beginning of the params i.e. (iphlen +
4978          * sizeof(struct sctp_init_msg) parse through the parameters to the
4979          * end of the mbuf verifying that all parameters are known.
4980          *
4981          * For unknown parameters build and return a mbuf with
4982          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4983          * processing this chunk stop, and set *abort_processing to 1.
4984          *
4985          * By having param_offset be pre-set to where parameters begin it is
4986          * hoped that this routine may be reused in the future by new
4987          * features.
4988          */
4989         struct sctp_paramhdr *phdr, params;
4990
4991         struct mbuf *mat, *op_err;
4992         int at, limit, pad_needed;
4993         uint16_t ptype, plen, padded_size;
4994         int err_at;
4995
4996         *abort_processing = 0;
4997         mat = in_initpkt;
4998         err_at = 0;
4999         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5000         at = param_offset;
5001         op_err = NULL;
5002         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5003         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5004         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5005                 ptype = ntohs(phdr->param_type);
5006                 plen = ntohs(phdr->param_length);
5007                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5008                         /* wacked parameter */
5009                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5010                         goto invalid_size;
5011                 }
5012                 limit -= SCTP_SIZE32(plen);
5013                 /*-
5014                  * All parameters for all chunks that we know/understand are
5015                  * listed here. We process them other places and make
5016                  * appropriate stop actions per the upper bits. However this
5017                  * is the generic routine processor's can call to get back
5018                  * an operr.. to either incorporate (init-ack) or send.
5019                  */
5020                 padded_size = SCTP_SIZE32(plen);
5021                 switch (ptype) {
5022                         /* Param's with variable size */
5023                 case SCTP_HEARTBEAT_INFO:
5024                 case SCTP_STATE_COOKIE:
5025                 case SCTP_UNRECOG_PARAM:
5026                 case SCTP_ERROR_CAUSE_IND:
5027                         /* ok skip fwd */
5028                         at += padded_size;
5029                         break;
5030                         /* Param's with variable size within a range */
5031                 case SCTP_CHUNK_LIST:
5032                 case SCTP_SUPPORTED_CHUNK_EXT:
5033                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5034                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5035                                 goto invalid_size;
5036                         }
5037                         at += padded_size;
5038                         break;
5039                 case SCTP_SUPPORTED_ADDRTYPE:
5040                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                 case SCTP_RANDOM:
5047                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5049                                 goto invalid_size;
5050                         }
5051                         at += padded_size;
5052                         break;
5053                 case SCTP_SET_PRIM_ADDR:
5054                 case SCTP_DEL_IP_ADDRESS:
5055                 case SCTP_ADD_IP_ADDRESS:
5056                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5057                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5059                                 goto invalid_size;
5060                         }
5061                         at += padded_size;
5062                         break;
5063                         /* Param's with a fixed size */
5064                 case SCTP_IPV4_ADDRESS:
5065                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5066                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5067                                 goto invalid_size;
5068                         }
5069                         at += padded_size;
5070                         break;
5071                 case SCTP_IPV6_ADDRESS:
5072                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_COOKIE_PRESERVE:
5079                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5081                                 goto invalid_size;
5082                         }
5083                         at += padded_size;
5084                         break;
5085                 case SCTP_HAS_NAT_SUPPORT:
5086                         *nat_friendly = 1;
5087                         /* fall through */
5088                 case SCTP_PRSCTP_SUPPORTED:
5089                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5091                                 goto invalid_size;
5092                         }
5093                         at += padded_size;
5094                         break;
5095                 case SCTP_ECN_CAPABLE:
5096                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5097                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5098                                 goto invalid_size;
5099                         }
5100                         at += padded_size;
5101                         break;
5102                 case SCTP_ULP_ADAPTATION:
5103                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5104                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5105                                 goto invalid_size;
5106                         }
5107                         at += padded_size;
5108                         break;
5109                 case SCTP_SUCCESS_REPORT:
5110                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5111                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5112                                 goto invalid_size;
5113                         }
5114                         at += padded_size;
5115                         break;
5116                 case SCTP_HOSTNAME_ADDRESS:
5117                         {
5118                                 /* Hostname parameters are deprecated. */
5119                                 struct sctp_gen_error_cause *cause;
5120                                 int l_len;
5121
5122                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5123                                 *abort_processing = 1;
5124                                 sctp_m_freem(op_err);
5125                                 op_err = NULL;
5126 #ifdef INET6
5127                                 l_len = SCTP_MIN_OVERHEAD;
5128 #else
5129                                 l_len = SCTP_MIN_V4_OVERHEAD;
5130 #endif
5131                                 l_len += sizeof(struct sctp_chunkhdr);
5132                                 l_len += sizeof(struct sctp_gen_error_cause);
5133                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5134                                 if (op_err) {
5135                                         /*
5136                                          * Pre-reserve space for IP, SCTP,
5137                                          * and chunk header.
5138                                          */
5139 #ifdef INET6
5140                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5141 #else
5142                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5143 #endif
5144                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5145                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5146                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5147                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5148                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5149                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5150                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5151                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5152                                                 sctp_m_freem(op_err);
5153                                                 op_err = NULL;
5154                                         }
5155                                 }
5156                                 return (op_err);
5157                                 break;
5158                         }
5159                 default:
5160                         /*
5161                          * we do not recognize the parameter figure out what
5162                          * we do.
5163                          */
5164                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5165                         if ((ptype & 0x4000) == 0x4000) {
5166                                 /* Report bit is set?? */
5167                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5168                                 if (op_err == NULL) {
5169                                         int l_len;
5170
5171                                         /* Ok need to try to get an mbuf */
5172 #ifdef INET6
5173                                         l_len = SCTP_MIN_OVERHEAD;
5174 #else
5175                                         l_len = SCTP_MIN_V4_OVERHEAD;
5176 #endif
5177                                         l_len += sizeof(struct sctp_chunkhdr);
5178                                         l_len += sizeof(struct sctp_paramhdr);
5179                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5180                                         if (op_err) {
5181                                                 SCTP_BUF_LEN(op_err) = 0;
5182 #ifdef INET6
5183                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5184 #else
5185                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5186 #endif
5187                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5188                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5189                                         }
5190                                 }
5191                                 if (op_err) {
5192                                         /* If we have space */
5193                                         struct sctp_paramhdr s;
5194
5195                                         if (err_at % 4) {
5196                                                 uint32_t cpthis = 0;
5197
5198                                                 pad_needed = 4 - (err_at % 4);
5199                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5200                                                 err_at += pad_needed;
5201                                         }
5202                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5203                                         s.param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5204                                         m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)&s);
5205                                         err_at += sizeof(struct sctp_paramhdr);
5206                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5207                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5208                                                 sctp_m_freem(op_err);
5209                                                 /*
5210                                                  * we are out of memory but
5211                                                  * we still need to have a
5212                                                  * look at what to do (the
5213                                                  * system is in trouble
5214                                                  * though).
5215                                                  */
5216                                                 op_err = NULL;
5217                                                 goto more_processing;
5218                                         }
5219                                         err_at += plen;
5220                                 }
5221                         }
5222         more_processing:
5223                         if ((ptype & 0x8000) == 0x0000) {
5224                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5225                                 return (op_err);
5226                         } else {
5227                                 /* skip this chunk and continue processing */
5228                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5229                                 at += SCTP_SIZE32(plen);
5230                         }
5231                         break;
5232
5233                 }
5234                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5235         }
5236         return (op_err);
5237 invalid_size:
5238         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5239         *abort_processing = 1;
5240         sctp_m_freem(op_err);
5241         op_err = NULL;
5242         if (phdr != NULL) {
5243                 struct sctp_paramhdr *param;
5244                 int l_len;
5245 #ifdef INET6
5246                 l_len = SCTP_MIN_OVERHEAD;
5247 #else
5248                 l_len = SCTP_MIN_V4_OVERHEAD;
5249 #endif
5250                 l_len += sizeof(struct sctp_chunkhdr);
5251                 l_len += (2 * sizeof(struct sctp_paramhdr));
5252                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5253                 if (op_err) {
5254                         SCTP_BUF_LEN(op_err) = 0;
5255 #ifdef INET6
5256                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5257 #else
5258                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5259 #endif
5260                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5261                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5262                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5263                         param = mtod(op_err, struct sctp_paramhdr *);
5264                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5265                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5266                         param++;
5267                         param->param_type = htons(ptype);
5268                         param->param_length = htons(plen);
5269                 }
5270         }
5271         return (op_err);
5272 }
5273
5274 static int
5275 sctp_are_there_new_addresses(struct sctp_association *asoc,
5276     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5277 {
5278         /*
5279          * Given a INIT packet, look through the packet to verify that there
5280          * are NO new addresses. As we go through the parameters add reports
5281          * of any un-understood parameters that require an error.  Also we
5282          * must return (1) to drop the packet if we see a un-understood
5283          * parameter that tells us to drop the chunk.
5284          */
5285         struct sockaddr *sa_touse;
5286         struct sockaddr *sa;
5287         struct sctp_paramhdr *phdr, params;
5288         uint16_t ptype, plen;
5289         uint8_t fnd;
5290         struct sctp_nets *net;
5291         int check_src;
5292 #ifdef INET
5293         struct sockaddr_in sin4, *sa4;
5294 #endif
5295 #ifdef INET6
5296         struct sockaddr_in6 sin6, *sa6;
5297 #endif
5298
5299 #ifdef INET
5300         memset(&sin4, 0, sizeof(sin4));
5301         sin4.sin_family = AF_INET;
5302         sin4.sin_len = sizeof(sin4);
5303 #endif
5304 #ifdef INET6
5305         memset(&sin6, 0, sizeof(sin6));
5306         sin6.sin6_family = AF_INET6;
5307         sin6.sin6_len = sizeof(sin6);
5308 #endif
5309         /* First what about the src address of the pkt ? */
5310         check_src = 0;
5311         switch (src->sa_family) {
5312 #ifdef INET
5313         case AF_INET:
5314                 if (asoc->scope.ipv4_addr_legal) {
5315                         check_src = 1;
5316                 }
5317                 break;
5318 #endif
5319 #ifdef INET6
5320         case AF_INET6:
5321                 if (asoc->scope.ipv6_addr_legal) {
5322                         check_src = 1;
5323                 }
5324                 break;
5325 #endif
5326         default:
5327                 /* TSNH */
5328                 break;
5329         }
5330         if (check_src) {
5331                 fnd = 0;
5332                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5333                         sa = (struct sockaddr *)&net->ro._l_addr;
5334                         if (sa->sa_family == src->sa_family) {
5335 #ifdef INET
5336                                 if (sa->sa_family == AF_INET) {
5337                                         struct sockaddr_in *src4;
5338
5339                                         sa4 = (struct sockaddr_in *)sa;
5340                                         src4 = (struct sockaddr_in *)src;
5341                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5342                                                 fnd = 1;
5343                                                 break;
5344                                         }
5345                                 }
5346 #endif
5347 #ifdef INET6
5348                                 if (sa->sa_family == AF_INET6) {
5349                                         struct sockaddr_in6 *src6;
5350
5351                                         sa6 = (struct sockaddr_in6 *)sa;
5352                                         src6 = (struct sockaddr_in6 *)src;
5353                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5354                                                 fnd = 1;
5355                                                 break;
5356                                         }
5357                                 }
5358 #endif
5359                         }
5360                 }
5361                 if (fnd == 0) {
5362                         /* New address added! no need to look further. */
5363                         return (1);
5364                 }
5365         }
5366         /* Ok so far lets munge through the rest of the packet */
5367         offset += sizeof(struct sctp_init_chunk);
5368         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5369         while (phdr) {
5370                 sa_touse = NULL;
5371                 ptype = ntohs(phdr->param_type);
5372                 plen = ntohs(phdr->param_length);
5373                 switch (ptype) {
5374 #ifdef INET
5375                 case SCTP_IPV4_ADDRESS:
5376                         {
5377                                 struct sctp_ipv4addr_param *p4, p4_buf;
5378
5379                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5380                                         return (1);
5381                                 }
5382                                 phdr = sctp_get_next_param(in_initpkt, offset,
5383                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5384                                 if (phdr == NULL) {
5385                                         return (1);
5386                                 }
5387                                 if (asoc->scope.ipv4_addr_legal) {
5388                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5389                                         sin4.sin_addr.s_addr = p4->addr;
5390                                         sa_touse = (struct sockaddr *)&sin4;
5391                                 }
5392                                 break;
5393                         }
5394 #endif
5395 #ifdef INET6
5396                 case SCTP_IPV6_ADDRESS:
5397                         {
5398                                 struct sctp_ipv6addr_param *p6, p6_buf;
5399
5400                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5401                                         return (1);
5402                                 }
5403                                 phdr = sctp_get_next_param(in_initpkt, offset,
5404                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5405                                 if (phdr == NULL) {
5406                                         return (1);
5407                                 }
5408                                 if (asoc->scope.ipv6_addr_legal) {
5409                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5410                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5411                                             sizeof(p6->addr));
5412                                         sa_touse = (struct sockaddr *)&sin6;
5413                                 }
5414                                 break;
5415                         }
5416 #endif
5417                 default:
5418                         sa_touse = NULL;
5419                         break;
5420                 }
5421                 if (sa_touse) {
5422                         /* ok, sa_touse points to one to check */
5423                         fnd = 0;
5424                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5425                                 sa = (struct sockaddr *)&net->ro._l_addr;
5426                                 if (sa->sa_family != sa_touse->sa_family) {
5427                                         continue;
5428                                 }
5429 #ifdef INET
5430                                 if (sa->sa_family == AF_INET) {
5431                                         sa4 = (struct sockaddr_in *)sa;
5432                                         if (sa4->sin_addr.s_addr ==
5433                                             sin4.sin_addr.s_addr) {
5434                                                 fnd = 1;
5435                                                 break;
5436                                         }
5437                                 }
5438 #endif
5439 #ifdef INET6
5440                                 if (sa->sa_family == AF_INET6) {
5441                                         sa6 = (struct sockaddr_in6 *)sa;
5442                                         if (SCTP6_ARE_ADDR_EQUAL(
5443                                             sa6, &sin6)) {
5444                                                 fnd = 1;
5445                                                 break;
5446                                         }
5447                                 }
5448 #endif
5449                         }
5450                         if (!fnd) {
5451                                 /* New addr added! no need to look further */
5452                                 return (1);
5453                         }
5454                 }
5455                 offset += SCTP_SIZE32(plen);
5456                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5457         }
5458         return (0);
5459 }
5460
5461 /*
5462  * Given a MBUF chain that was sent into us containing an INIT. Build a
5463  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5464  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5465  * message (i.e. the struct sctp_init_msg).
5466  */
5467 void
5468 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5469     struct sctp_nets *src_net, struct mbuf *init_pkt,
5470     int iphlen, int offset,
5471     struct sockaddr *src, struct sockaddr *dst,
5472     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5473     uint8_t mflowtype, uint32_t mflowid,
5474     uint32_t vrf_id, uint16_t port)
5475 {
5476         struct sctp_association *asoc;
5477         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5478         struct sctp_init_ack_chunk *initack;
5479         struct sctp_adaptation_layer_indication *ali;
5480         struct sctp_supported_chunk_types_param *pr_supported;
5481         struct sctp_paramhdr *ph;
5482         union sctp_sockstore *over_addr;
5483         struct sctp_scoping scp;
5484         struct timeval now;
5485 #ifdef INET
5486         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5487         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5488         struct sockaddr_in *sin;
5489 #endif
5490 #ifdef INET6
5491         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5492         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5493         struct sockaddr_in6 *sin6;
5494 #endif
5495         struct sockaddr *to;
5496         struct sctp_state_cookie stc;
5497         struct sctp_nets *net = NULL;
5498         uint8_t *signature = NULL;
5499         int cnt_inits_to = 0;
5500         uint16_t his_limit, i_want;
5501         int abort_flag;
5502         int nat_friendly = 0;
5503         int error;
5504         struct socket *so;
5505         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5506
5507         if (stcb) {
5508                 asoc = &stcb->asoc;
5509         } else {
5510                 asoc = NULL;
5511         }
5512         if ((asoc != NULL) &&
5513             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5514                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5515                         /*
5516                          * new addresses, out of here in non-cookie-wait
5517                          * states
5518                          *
5519                          * Send an ABORT, without the new address error
5520                          * cause. This looks no different than if no
5521                          * listener was present.
5522                          */
5523                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5524                             "Address added");
5525                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5526                             mflowtype, mflowid, inp->fibnum,
5527                             vrf_id, port);
5528                         return;
5529                 }
5530                 if (src_net != NULL && (src_net->port != port)) {
5531                         /*
5532                          * change of remote encapsulation port, out of here
5533                          * in non-cookie-wait states
5534                          *
5535                          * Send an ABORT, without an specific error cause.
5536                          * This looks no different than if no listener was
5537                          * present.
5538                          */
5539                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5540                             "Remote encapsulation port changed");
5541                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5542                             mflowtype, mflowid, inp->fibnum,
5543                             vrf_id, port);
5544                         return;
5545                 }
5546         }
5547         abort_flag = 0;
5548         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5549             (offset + sizeof(struct sctp_init_chunk)),
5550             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5551         if (abort_flag) {
5552 do_a_abort:
5553                 if (op_err == NULL) {
5554                         char msg[SCTP_DIAG_INFO_LEN];
5555
5556                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5557                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5558                             msg);
5559                 }
5560                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5561                     init_chk->init.initiate_tag, op_err,
5562                     mflowtype, mflowid, inp->fibnum,
5563                     vrf_id, port);
5564                 return;
5565         }
5566         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5567         if (m == NULL) {
5568                 /* No memory, INIT timer will re-attempt. */
5569                 sctp_m_freem(op_err);
5570                 return;
5571         }
5572         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5573         padding_len = 0;
5574
5575         /*
5576          * We might not overwrite the identification[] completely and on
5577          * some platforms time_entered will contain some padding. Therefore
5578          * zero out the cookie to avoid putting uninitialized memory on the
5579          * wire.
5580          */
5581         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5582
5583         /* the time I built cookie */
5584         (void)SCTP_GETTIME_TIMEVAL(&now);
5585         stc.time_entered.tv_sec = now.tv_sec;
5586         stc.time_entered.tv_usec = now.tv_usec;
5587
5588         /* populate any tie tags */
5589         if (asoc != NULL) {
5590                 /* unlock before tag selections */
5591                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5592                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5593                 stc.cookie_life = asoc->cookie_life;
5594                 net = asoc->primary_destination;
5595         } else {
5596                 stc.tie_tag_my_vtag = 0;
5597                 stc.tie_tag_peer_vtag = 0;
5598                 /* life I will award this cookie */
5599                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5600         }
5601
5602         /* copy in the ports for later check */
5603         stc.myport = sh->dest_port;
5604         stc.peerport = sh->src_port;
5605
5606         /*
5607          * If we wanted to honor cookie life extensions, we would add to
5608          * stc.cookie_life. For now we should NOT honor any extension
5609          */
5610         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5611         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5612                 stc.ipv6_addr_legal = 1;
5613                 if (SCTP_IPV6_V6ONLY(inp)) {
5614                         stc.ipv4_addr_legal = 0;
5615                 } else {
5616                         stc.ipv4_addr_legal = 1;
5617                 }
5618         } else {
5619                 stc.ipv6_addr_legal = 0;
5620                 stc.ipv4_addr_legal = 1;
5621         }
5622         stc.ipv4_scope = 0;
5623         if (net == NULL) {
5624                 to = src;
5625                 switch (dst->sa_family) {
5626 #ifdef INET
5627                 case AF_INET:
5628                         {
5629                                 /* lookup address */
5630                                 stc.address[0] = src4->sin_addr.s_addr;
5631                                 stc.address[1] = 0;
5632                                 stc.address[2] = 0;
5633                                 stc.address[3] = 0;
5634                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5635                                 /* local from address */
5636                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5637                                 stc.laddress[1] = 0;
5638                                 stc.laddress[2] = 0;
5639                                 stc.laddress[3] = 0;
5640                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5641                                 /* scope_id is only for v6 */
5642                                 stc.scope_id = 0;
5643                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5644                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5645                                         stc.ipv4_scope = 1;
5646                                 }
5647                                 /* Must use the address in this case */
5648                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5649                                         stc.loopback_scope = 1;
5650                                         stc.ipv4_scope = 1;
5651                                         stc.site_scope = 1;
5652                                         stc.local_scope = 0;
5653                                 }
5654                                 break;
5655                         }
5656 #endif
5657 #ifdef INET6
5658                 case AF_INET6:
5659                         {
5660                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5661                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5662                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5663                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5664                                         stc.loopback_scope = 1;
5665                                         stc.local_scope = 0;
5666                                         stc.site_scope = 1;
5667                                         stc.ipv4_scope = 1;
5668                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5669                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5670                                         /*
5671                                          * If the new destination or source
5672                                          * is a LINK_LOCAL we must have
5673                                          * common both site and local scope.
5674                                          * Don't set local scope though
5675                                          * since we must depend on the
5676                                          * source to be added implicitly. We
5677                                          * cannot assure just because we
5678                                          * share one link that all links are
5679                                          * common.
5680                                          */
5681                                         stc.local_scope = 0;
5682                                         stc.site_scope = 1;
5683                                         stc.ipv4_scope = 1;
5684                                         /*
5685                                          * we start counting for the private
5686                                          * address stuff at 1. since the
5687                                          * link local we source from won't
5688                                          * show up in our scoped count.
5689                                          */
5690                                         cnt_inits_to = 1;
5691                                         /*
5692                                          * pull out the scope_id from
5693                                          * incoming pkt
5694                                          */
5695                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5696                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5697                                         /*
5698                                          * If the new destination or source
5699                                          * is SITE_LOCAL then we must have
5700                                          * site scope in common.
5701                                          */
5702                                         stc.site_scope = 1;
5703                                 }
5704                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5705                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5706                                 break;
5707                         }
5708 #endif
5709                 default:
5710                         /* TSNH */
5711                         goto do_a_abort;
5712                         break;
5713                 }
5714         } else {
5715                 /* set the scope per the existing tcb */
5716
5717 #ifdef INET6
5718                 struct sctp_nets *lnet;
5719 #endif
5720
5721                 stc.loopback_scope = asoc->scope.loopback_scope;
5722                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5723                 stc.site_scope = asoc->scope.site_scope;
5724                 stc.local_scope = asoc->scope.local_scope;
5725 #ifdef INET6
5726                 /* Why do we not consider IPv4 LL addresses? */
5727                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5728                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5729                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5730                                         /*
5731                                          * if we have a LL address, start
5732                                          * counting at 1.
5733                                          */
5734                                         cnt_inits_to = 1;
5735                                 }
5736                         }
5737                 }
5738 #endif
5739                 /* use the net pointer */
5740                 to = (struct sockaddr *)&net->ro._l_addr;
5741                 switch (to->sa_family) {
5742 #ifdef INET
5743                 case AF_INET:
5744                         sin = (struct sockaddr_in *)to;
5745                         stc.address[0] = sin->sin_addr.s_addr;
5746                         stc.address[1] = 0;
5747                         stc.address[2] = 0;
5748                         stc.address[3] = 0;
5749                         stc.addr_type = SCTP_IPV4_ADDRESS;
5750                         if (net->src_addr_selected == 0) {
5751                                 /*
5752                                  * strange case here, the INIT should have
5753                                  * did the selection.
5754                                  */
5755                                 net->ro._s_addr = sctp_source_address_selection(inp,
5756                                     stcb, (sctp_route_t *)&net->ro,
5757                                     net, 0, vrf_id);
5758                                 if (net->ro._s_addr == NULL) {
5759                                         sctp_m_freem(op_err);
5760                                         sctp_m_freem(m);
5761                                         return;
5762                                 }
5763
5764                                 net->src_addr_selected = 1;
5765
5766                         }
5767                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5768                         stc.laddress[1] = 0;
5769                         stc.laddress[2] = 0;
5770                         stc.laddress[3] = 0;
5771                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5772                         /* scope_id is only for v6 */
5773                         stc.scope_id = 0;
5774                         break;
5775 #endif
5776 #ifdef INET6
5777                 case AF_INET6:
5778                         sin6 = (struct sockaddr_in6 *)to;
5779                         memcpy(&stc.address, &sin6->sin6_addr,
5780                             sizeof(struct in6_addr));
5781                         stc.addr_type = SCTP_IPV6_ADDRESS;
5782                         stc.scope_id = sin6->sin6_scope_id;
5783                         if (net->src_addr_selected == 0) {
5784                                 /*
5785                                  * strange case here, the INIT should have
5786                                  * done the selection.
5787                                  */
5788                                 net->ro._s_addr = sctp_source_address_selection(inp,
5789                                     stcb, (sctp_route_t *)&net->ro,
5790                                     net, 0, vrf_id);
5791                                 if (net->ro._s_addr == NULL) {
5792                                         sctp_m_freem(op_err);
5793                                         sctp_m_freem(m);
5794                                         return;
5795                                 }
5796
5797                                 net->src_addr_selected = 1;
5798                         }
5799                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5800                             sizeof(struct in6_addr));
5801                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5802                         break;
5803 #endif
5804                 }
5805         }
5806         /* Now lets put the SCTP header in place */
5807         initack = mtod(m, struct sctp_init_ack_chunk *);
5808         /* Save it off for quick ref */
5809         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5810         /* who are we */
5811         memcpy(stc.identification, SCTP_VERSION_STRING,
5812             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5813         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5814         /* now the chunk header */
5815         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5816         initack->ch.chunk_flags = 0;
5817         /* fill in later from mbuf we build */
5818         initack->ch.chunk_length = 0;
5819         /* place in my tag */
5820         if ((asoc != NULL) &&
5821             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5822             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5823             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5824                 /* re-use the v-tags and init-seq here */
5825                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5826                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5827         } else {
5828                 uint32_t vtag, itsn;
5829
5830                 if (asoc) {
5831                         atomic_add_int(&asoc->refcnt, 1);
5832                         SCTP_TCB_UNLOCK(stcb);
5833         new_tag:
5834                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5835                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5836                                 /*
5837                                  * Got a duplicate vtag on some guy behind a
5838                                  * nat make sure we don't use it.
5839                                  */
5840                                 goto new_tag;
5841                         }
5842                         initack->init.initiate_tag = htonl(vtag);
5843                         /* get a TSN to use too */
5844                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5845                         initack->init.initial_tsn = htonl(itsn);
5846                         SCTP_TCB_LOCK(stcb);
5847                         atomic_add_int(&asoc->refcnt, -1);
5848                 } else {
5849                         SCTP_INP_INCR_REF(inp);
5850                         SCTP_INP_RUNLOCK(inp);
5851                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5852                         initack->init.initiate_tag = htonl(vtag);
5853                         /* get a TSN to use too */
5854                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5855                         SCTP_INP_RLOCK(inp);
5856                         SCTP_INP_DECR_REF(inp);
5857                 }
5858         }
5859         /* save away my tag to */
5860         stc.my_vtag = initack->init.initiate_tag;
5861
5862         /* set up some of the credits. */
5863         so = inp->sctp_socket;
5864         if (so == NULL) {
5865                 /* memory problem */
5866                 sctp_m_freem(op_err);
5867                 sctp_m_freem(m);
5868                 return;
5869         } else {
5870                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5871         }
5872         /* set what I want */
5873         his_limit = ntohs(init_chk->init.num_inbound_streams);
5874         /* choose what I want */
5875         if (asoc != NULL) {
5876                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5877                         i_want = asoc->streamoutcnt;
5878                 } else {
5879                         i_want = asoc->pre_open_streams;
5880                 }
5881         } else {
5882                 i_want = inp->sctp_ep.pre_open_stream_count;
5883         }
5884         if (his_limit < i_want) {
5885                 /* I Want more :< */
5886                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5887         } else {
5888                 /* I can have what I want :> */
5889                 initack->init.num_outbound_streams = htons(i_want);
5890         }
5891         /* tell him his limit. */
5892         initack->init.num_inbound_streams =
5893             htons(inp->sctp_ep.max_open_streams_intome);
5894
5895         /* adaptation layer indication parameter */
5896         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5897                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5898                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5899                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5900                 ali->ph.param_length = htons(parameter_len);
5901                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5902                 chunk_len += parameter_len;
5903         }
5904
5905         /* ECN parameter */
5906         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5907             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5908                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5909                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5910                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5911                 ph->param_length = htons(parameter_len);
5912                 chunk_len += parameter_len;
5913         }
5914
5915         /* PR-SCTP supported parameter */
5916         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5917             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5918                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5919                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5920                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5921                 ph->param_length = htons(parameter_len);
5922                 chunk_len += parameter_len;
5923         }
5924
5925         /* Add NAT friendly parameter */
5926         if (nat_friendly) {
5927                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5928                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5929                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5930                 ph->param_length = htons(parameter_len);
5931                 chunk_len += parameter_len;
5932         }
5933
5934         /* And now tell the peer which extensions we support */
5935         num_ext = 0;
5936         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5937         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5938             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5939                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5940                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5941                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5942                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5943                 }
5944         }
5945         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5946             ((asoc == NULL) && (inp->auth_supported == 1))) {
5947                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5948         }
5949         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5950             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5951                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5952                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5953         }
5954         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5955             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5956                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5957         }
5958         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5959             ((asoc == NULL) && (inp->idata_supported == 1))) {
5960                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5961         }
5962         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5963             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5964                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5965         }
5966         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5967             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5969         }
5970         if (num_ext > 0) {
5971                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5972                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5973                 pr_supported->ph.param_length = htons(parameter_len);
5974                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5975                 chunk_len += parameter_len;
5976         }
5977
5978         /* add authentication parameters */
5979         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5980             ((asoc == NULL) && (inp->auth_supported == 1))) {
5981                 struct sctp_auth_random *randp;
5982                 struct sctp_auth_hmac_algo *hmacs;
5983                 struct sctp_auth_chunk_list *chunks;
5984
5985                 if (padding_len > 0) {
5986                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5987                         chunk_len += padding_len;
5988                         padding_len = 0;
5989                 }
5990                 /* generate and add RANDOM parameter */
5991                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5992                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5993                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5994                 randp->ph.param_type = htons(SCTP_RANDOM);
5995                 randp->ph.param_length = htons(parameter_len);
5996                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5997                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5998                 chunk_len += parameter_len;
5999
6000                 if (padding_len > 0) {
6001                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6002                         chunk_len += padding_len;
6003                         padding_len = 0;
6004                 }
6005                 /* add HMAC_ALGO parameter */
6006                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6007                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6008                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6009                     (uint8_t *)hmacs->hmac_ids);
6010                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6011                 hmacs->ph.param_length = htons(parameter_len);
6012                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6013                 chunk_len += parameter_len;
6014
6015                 if (padding_len > 0) {
6016                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6017                         chunk_len += padding_len;
6018                         padding_len = 0;
6019                 }
6020                 /* add CHUNKS parameter */
6021                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6022                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6023                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6024                     chunks->chunk_types);
6025                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6026                 chunks->ph.param_length = htons(parameter_len);
6027                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6028                 chunk_len += parameter_len;
6029         }
6030         SCTP_BUF_LEN(m) = chunk_len;
6031         m_last = m;
6032         /* now the addresses */
6033         /*
6034          * To optimize this we could put the scoping stuff into a structure
6035          * and remove the individual uint8's from the stc structure. Then we
6036          * could just sifa in the address within the stc.. but for now this
6037          * is a quick hack to get the address stuff teased apart.
6038          */
6039         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6040         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6041         scp.loopback_scope = stc.loopback_scope;
6042         scp.ipv4_local_scope = stc.ipv4_scope;
6043         scp.local_scope = stc.local_scope;
6044         scp.site_scope = stc.site_scope;
6045         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6046             cnt_inits_to,
6047             &padding_len, &chunk_len);
6048         /* padding_len can only be positive, if no addresses have been added */
6049         if (padding_len > 0) {
6050                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6051                 chunk_len += padding_len;
6052                 SCTP_BUF_LEN(m) += padding_len;
6053                 padding_len = 0;
6054         }
6055
6056         /* tack on the operational error if present */
6057         if (op_err) {
6058                 parameter_len = 0;
6059                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6060                         parameter_len += SCTP_BUF_LEN(m_tmp);
6061                 }
6062                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6063                 SCTP_BUF_NEXT(m_last) = op_err;
6064                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6065                         m_last = SCTP_BUF_NEXT(m_last);
6066                 }
6067                 chunk_len += parameter_len;
6068         }
6069         if (padding_len > 0) {
6070                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6071                 if (m_last == NULL) {
6072                         /* Houston we have a problem, no space */
6073                         sctp_m_freem(m);
6074                         return;
6075                 }
6076                 chunk_len += padding_len;
6077                 padding_len = 0;
6078         }
6079         /* Now we must build a cookie */
6080         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6081         if (m_cookie == NULL) {
6082                 /* memory problem */
6083                 sctp_m_freem(m);
6084                 return;
6085         }
6086         /* Now append the cookie to the end and update the space/size */
6087         SCTP_BUF_NEXT(m_last) = m_cookie;
6088         parameter_len = 0;
6089         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6090                 parameter_len += SCTP_BUF_LEN(m_tmp);
6091                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6092                         m_last = m_tmp;
6093                 }
6094         }
6095         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6096         chunk_len += parameter_len;
6097
6098         /*
6099          * Place in the size, but we don't include the last pad (if any) in
6100          * the INIT-ACK.
6101          */
6102         initack->ch.chunk_length = htons(chunk_len);
6103
6104         /*
6105          * Time to sign the cookie, we don't sign over the cookie signature
6106          * though thus we set trailer.
6107          */
6108         (void)sctp_hmac_m(SCTP_HMAC,
6109             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6110             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6111             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6112         /*
6113          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6114          * here since the timer will drive a retranmission.
6115          */
6116         if (padding_len > 0) {
6117                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6118                         sctp_m_freem(m);
6119                         return;
6120                 }
6121         }
6122         if (stc.loopback_scope) {
6123                 over_addr = (union sctp_sockstore *)dst;
6124         } else {
6125                 over_addr = NULL;
6126         }
6127
6128         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6129             0, 0,
6130             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6131             port, over_addr,
6132             mflowtype, mflowid,
6133             SCTP_SO_NOT_LOCKED))) {
6134                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6135                 if (error == ENOBUFS) {
6136                         if (asoc != NULL) {
6137                                 asoc->ifp_had_enobuf = 1;
6138                         }
6139                         SCTP_STAT_INCR(sctps_lowlevelerr);
6140                 }
6141         } else {
6142                 if (asoc != NULL) {
6143                         asoc->ifp_had_enobuf = 0;
6144                 }
6145         }
6146         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6147 }
6148
6149
6150 static void
6151 sctp_prune_prsctp(struct sctp_tcb *stcb,
6152     struct sctp_association *asoc,
6153     struct sctp_sndrcvinfo *srcv,
6154     int dataout)
6155 {
6156         int freed_spc = 0;
6157         struct sctp_tmit_chunk *chk, *nchk;
6158
6159         SCTP_TCB_LOCK_ASSERT(stcb);
6160         if ((asoc->prsctp_supported) &&
6161             (asoc->sent_queue_cnt_removeable > 0)) {
6162                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6163                         /*
6164                          * Look for chunks marked with the PR_SCTP flag AND
6165                          * the buffer space flag. If the one being sent is
6166                          * equal or greater priority then purge the old one
6167                          * and free some space.
6168                          */
6169                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6170                                 /*
6171                                  * This one is PR-SCTP AND buffer space
6172                                  * limited type
6173                                  */
6174                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6175                                         /*
6176                                          * Lower numbers equates to higher
6177                                          * priority so if the one we are
6178                                          * looking at has a larger or equal
6179                                          * priority we want to drop the data
6180                                          * and NOT retransmit it.
6181                                          */
6182                                         if (chk->data) {
6183                                                 /*
6184                                                  * We release the book_size
6185                                                  * if the mbuf is here
6186                                                  */
6187                                                 int ret_spc;
6188                                                 uint8_t sent;
6189
6190                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6191                                                         sent = 1;
6192                                                 else
6193                                                         sent = 0;
6194                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6195                                                     sent,
6196                                                     SCTP_SO_LOCKED);
6197                                                 freed_spc += ret_spc;
6198                                                 if (freed_spc >= dataout) {
6199                                                         return;
6200                                                 }
6201                                         }       /* if chunk was present */
6202                                 }       /* if of sufficient priority */
6203                         }       /* if chunk has enabled */
6204                 }               /* tailqforeach */
6205
6206                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6207                         /* Here we must move to the sent queue and mark */
6208                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6209                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6210                                         if (chk->data) {
6211                                                 /*
6212                                                  * We release the book_size
6213                                                  * if the mbuf is here
6214                                                  */
6215                                                 int ret_spc;
6216
6217                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6218                                                     0, SCTP_SO_LOCKED);
6219
6220                                                 freed_spc += ret_spc;
6221                                                 if (freed_spc >= dataout) {
6222                                                         return;
6223                                                 }
6224                                         }       /* end if chk->data */
6225                                 }       /* end if right class */
6226                         }       /* end if chk pr-sctp */
6227                 }               /* tailqforeachsafe (chk) */
6228         }                       /* if enabled in asoc */
6229 }
6230
6231 int
6232 sctp_get_frag_point(struct sctp_tcb *stcb,
6233     struct sctp_association *asoc)
6234 {
6235         int siz, ovh;
6236
6237         /*
6238          * For endpoints that have both v6 and v4 addresses we must reserve
6239          * room for the ipv6 header, for those that are only dealing with V4
6240          * we use a larger frag point.
6241          */
6242         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6243                 ovh = SCTP_MIN_OVERHEAD;
6244         } else {
6245                 ovh = SCTP_MIN_V4_OVERHEAD;
6246         }
6247         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6248         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6249                 siz = asoc->smallest_mtu - ovh;
6250         else
6251                 siz = (stcb->asoc.sctp_frag_point - ovh);
6252         /*
6253          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6254          */
6255         /* A data chunk MUST fit in a cluster */
6256         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6257         /* } */
6258
6259         /* adjust for an AUTH chunk if DATA requires auth */
6260         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6261                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6262
6263         if (siz % 4) {
6264                 /* make it an even word boundary please */
6265                 siz -= (siz % 4);
6266         }
6267         return (siz);
6268 }
6269
6270 static void
6271 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6272 {
6273         /*
6274          * We assume that the user wants PR_SCTP_TTL if the user provides a
6275          * positive lifetime but does not specify any PR_SCTP policy.
6276          */
6277         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6278                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6279         } else if (sp->timetolive > 0) {
6280                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6281                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6282         } else {
6283                 return;
6284         }
6285         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6286         case CHUNK_FLAGS_PR_SCTP_BUF:
6287                 /*
6288                  * Time to live is a priority stored in tv_sec when doing
6289                  * the buffer drop thing.
6290                  */
6291                 sp->ts.tv_sec = sp->timetolive;
6292                 sp->ts.tv_usec = 0;
6293                 break;
6294         case CHUNK_FLAGS_PR_SCTP_TTL:
6295                 {
6296                         struct timeval tv;
6297
6298                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6299                         tv.tv_sec = sp->timetolive / 1000;
6300                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6301                         /*
6302                          * TODO sctp_constants.h needs alternative time
6303                          * macros when _KERNEL is undefined.
6304                          */
6305                         timevaladd(&sp->ts, &tv);
6306                 }
6307                 break;
6308         case CHUNK_FLAGS_PR_SCTP_RTX:
6309                 /*
6310                  * Time to live is a the number or retransmissions stored in
6311                  * tv_sec.
6312                  */
6313                 sp->ts.tv_sec = sp->timetolive;
6314                 sp->ts.tv_usec = 0;
6315                 break;
6316         default:
6317                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6318                     "Unknown PR_SCTP policy %u.\n",
6319                     PR_SCTP_POLICY(sp->sinfo_flags));
6320                 break;
6321         }
6322 }
6323
6324 static int
6325 sctp_msg_append(struct sctp_tcb *stcb,
6326     struct sctp_nets *net,
6327     struct mbuf *m,
6328     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6329 {
6330         int error = 0;
6331         struct mbuf *at;
6332         struct sctp_stream_queue_pending *sp = NULL;
6333         struct sctp_stream_out *strm;
6334
6335         /*
6336          * Given an mbuf chain, put it into the association send queue and
6337          * place it on the wheel
6338          */
6339         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6340                 /* Invalid stream number */
6341                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6342                 error = EINVAL;
6343                 goto out_now;
6344         }
6345         if ((stcb->asoc.stream_locked) &&
6346             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6347                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6348                 error = EINVAL;
6349                 goto out_now;
6350         }
6351         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6352         /* Now can we send this? */
6353         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6354             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6355             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6356             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6357                 /* got data while shutting down */
6358                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6359                 error = ECONNRESET;
6360                 goto out_now;
6361         }
6362         sctp_alloc_a_strmoq(stcb, sp);
6363         if (sp == NULL) {
6364                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6365                 error = ENOMEM;
6366                 goto out_now;
6367         }
6368         sp->sinfo_flags = srcv->sinfo_flags;
6369         sp->timetolive = srcv->sinfo_timetolive;
6370         sp->ppid = srcv->sinfo_ppid;
6371         sp->context = srcv->sinfo_context;
6372         sp->fsn = 0;
6373         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6374                 sp->net = net;
6375                 atomic_add_int(&sp->net->ref_count, 1);
6376         } else {
6377                 sp->net = NULL;
6378         }
6379         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6380         sp->sid = srcv->sinfo_stream;
6381         sp->msg_is_complete = 1;
6382         sp->sender_all_done = 1;
6383         sp->some_taken = 0;
6384         sp->data = m;
6385         sp->tail_mbuf = NULL;
6386         sctp_set_prsctp_policy(sp);
6387         /*
6388          * We could in theory (for sendall) sifa the length in, but we would
6389          * still have to hunt through the chain since we need to setup the
6390          * tail_mbuf
6391          */
6392         sp->length = 0;
6393         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6394                 if (SCTP_BUF_NEXT(at) == NULL)
6395                         sp->tail_mbuf = at;
6396                 sp->length += SCTP_BUF_LEN(at);
6397         }
6398         if (srcv->sinfo_keynumber_valid) {
6399                 sp->auth_keyid = srcv->sinfo_keynumber;
6400         } else {
6401                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6402         }
6403         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6404                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6405                 sp->holds_key_ref = 1;
6406         }
6407         if (hold_stcb_lock == 0) {
6408                 SCTP_TCB_SEND_LOCK(stcb);
6409         }
6410         sctp_snd_sb_alloc(stcb, sp->length);
6411         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6412         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6413         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6414         m = NULL;
6415         if (hold_stcb_lock == 0) {
6416                 SCTP_TCB_SEND_UNLOCK(stcb);
6417         }
6418 out_now:
6419         if (m) {
6420                 sctp_m_freem(m);
6421         }
6422         return (error);
6423 }
6424
6425
6426 static struct mbuf *
6427 sctp_copy_mbufchain(struct mbuf *clonechain,
6428     struct mbuf *outchain,
6429     struct mbuf **endofchain,
6430     int can_take_mbuf,
6431     int sizeofcpy,
6432     uint8_t copy_by_ref)
6433 {
6434         struct mbuf *m;
6435         struct mbuf *appendchain;
6436         caddr_t cp;
6437         int len;
6438
6439         if (endofchain == NULL) {
6440                 /* error */
6441 error_out:
6442                 if (outchain)
6443                         sctp_m_freem(outchain);
6444                 return (NULL);
6445         }
6446         if (can_take_mbuf) {
6447                 appendchain = clonechain;
6448         } else {
6449                 if (!copy_by_ref &&
6450                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6451                     ) {
6452                         /* Its not in a cluster */
6453                         if (*endofchain == NULL) {
6454                                 /* lets get a mbuf cluster */
6455                                 if (outchain == NULL) {
6456                                         /* This is the general case */
6457                         new_mbuf:
6458                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6459                                         if (outchain == NULL) {
6460                                                 goto error_out;
6461                                         }
6462                                         SCTP_BUF_LEN(outchain) = 0;
6463                                         *endofchain = outchain;
6464                                         /* get the prepend space */
6465                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6466                                 } else {
6467                                         /*
6468                                          * We really should not get a NULL
6469                                          * in endofchain
6470                                          */
6471                                         /* find end */
6472                                         m = outchain;
6473                                         while (m) {
6474                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6475                                                         *endofchain = m;
6476                                                         break;
6477                                                 }
6478                                                 m = SCTP_BUF_NEXT(m);
6479                                         }
6480                                         /* sanity */
6481                                         if (*endofchain == NULL) {
6482                                                 /*
6483                                                  * huh, TSNH XXX maybe we
6484                                                  * should panic
6485                                                  */
6486                                                 sctp_m_freem(outchain);
6487                                                 goto new_mbuf;
6488                                         }
6489                                 }
6490                                 /* get the new end of length */
6491                                 len = (int)M_TRAILINGSPACE(*endofchain);
6492                         } else {
6493                                 /* how much is left at the end? */
6494                                 len = (int)M_TRAILINGSPACE(*endofchain);
6495                         }
6496                         /* Find the end of the data, for appending */
6497                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6498
6499                         /* Now lets copy it out */
6500                         if (len >= sizeofcpy) {
6501                                 /* It all fits, copy it in */
6502                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6503                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6504                         } else {
6505                                 /* fill up the end of the chain */
6506                                 if (len > 0) {
6507                                         m_copydata(clonechain, 0, len, cp);
6508                                         SCTP_BUF_LEN((*endofchain)) += len;
6509                                         /* now we need another one */
6510                                         sizeofcpy -= len;
6511                                 }
6512                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6513                                 if (m == NULL) {
6514                                         /* We failed */
6515                                         goto error_out;
6516                                 }
6517                                 SCTP_BUF_NEXT((*endofchain)) = m;
6518                                 *endofchain = m;
6519                                 cp = mtod((*endofchain), caddr_t);
6520                                 m_copydata(clonechain, len, sizeofcpy, cp);
6521                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6522                         }
6523                         return (outchain);
6524                 } else {
6525                         /* copy the old fashion way */
6526                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6527 #ifdef SCTP_MBUF_LOGGING
6528                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6529                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6530                         }
6531 #endif
6532                 }
6533         }
6534         if (appendchain == NULL) {
6535                 /* error */
6536                 if (outchain)
6537                         sctp_m_freem(outchain);
6538                 return (NULL);
6539         }
6540         if (outchain) {
6541                 /* tack on to the end */
6542                 if (*endofchain != NULL) {
6543                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6544                 } else {
6545                         m = outchain;
6546                         while (m) {
6547                                 if (SCTP_BUF_NEXT(m) == NULL) {
6548                                         SCTP_BUF_NEXT(m) = appendchain;
6549                                         break;
6550                                 }
6551                                 m = SCTP_BUF_NEXT(m);
6552                         }
6553                 }
6554                 /*
6555                  * save off the end and update the end-chain position
6556                  */
6557                 m = appendchain;
6558                 while (m) {
6559                         if (SCTP_BUF_NEXT(m) == NULL) {
6560                                 *endofchain = m;
6561                                 break;
6562                         }
6563                         m = SCTP_BUF_NEXT(m);
6564                 }
6565                 return (outchain);
6566         } else {
6567                 /* save off the end and update the end-chain position */
6568                 m = appendchain;
6569                 while (m) {
6570                         if (SCTP_BUF_NEXT(m) == NULL) {
6571                                 *endofchain = m;
6572                                 break;
6573                         }
6574                         m = SCTP_BUF_NEXT(m);
6575                 }
6576                 return (appendchain);
6577         }
6578 }
6579
6580 static int
6581 sctp_med_chunk_output(struct sctp_inpcb *inp,
6582     struct sctp_tcb *stcb,
6583     struct sctp_association *asoc,
6584     int *num_out,
6585     int *reason_code,
6586     int control_only, int from_where,
6587     struct timeval *now, int *now_filled, int frag_point, int so_locked
6588 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6589     SCTP_UNUSED
6590 #endif
6591 );
6592
6593 static void
6594 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6595     uint32_t val SCTP_UNUSED)
6596 {
6597         struct sctp_copy_all *ca;
6598         struct mbuf *m;
6599         int ret = 0;
6600         int added_control = 0;
6601         int un_sent, do_chunk_output = 1;
6602         struct sctp_association *asoc;
6603         struct sctp_nets *net;
6604
6605         ca = (struct sctp_copy_all *)ptr;
6606         if (ca->m == NULL) {
6607                 return;
6608         }
6609         if (ca->inp != inp) {
6610                 /* TSNH */
6611                 return;
6612         }
6613         if (ca->sndlen > 0) {
6614                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6615                 if (m == NULL) {
6616                         /* can't copy so we are done */
6617                         ca->cnt_failed++;
6618                         return;
6619                 }
6620 #ifdef SCTP_MBUF_LOGGING
6621                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6622                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6623                 }
6624 #endif
6625         } else {
6626                 m = NULL;
6627         }
6628         SCTP_TCB_LOCK_ASSERT(stcb);
6629         if (stcb->asoc.alternate) {
6630                 net = stcb->asoc.alternate;
6631         } else {
6632                 net = stcb->asoc.primary_destination;
6633         }
6634         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6635                 /* Abort this assoc with m as the user defined reason */
6636                 if (m != NULL) {
6637                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6638                 } else {
6639                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6640                             0, M_NOWAIT, 1, MT_DATA);
6641                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6642                 }
6643                 if (m != NULL) {
6644                         struct sctp_paramhdr *ph;
6645
6646                         ph = mtod(m, struct sctp_paramhdr *);
6647                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6648                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6649                 }
6650                 /*
6651                  * We add one here to keep the assoc from dis-appearing on
6652                  * us.
6653                  */
6654                 atomic_add_int(&stcb->asoc.refcnt, 1);
6655                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6656                 /*
6657                  * sctp_abort_an_association calls sctp_free_asoc() free
6658                  * association will NOT free it since we incremented the
6659                  * refcnt .. we do this to prevent it being freed and things
6660                  * getting tricky since we could end up (from free_asoc)
6661                  * calling inpcb_free which would get a recursive lock call
6662                  * to the iterator lock.. But as a consequence of that the
6663                  * stcb will return to us un-locked.. since free_asoc
6664                  * returns with either no TCB or the TCB unlocked, we must
6665                  * relock.. to unlock in the iterator timer :-0
6666                  */
6667                 SCTP_TCB_LOCK(stcb);
6668                 atomic_add_int(&stcb->asoc.refcnt, -1);
6669                 goto no_chunk_output;
6670         } else {
6671                 if (m) {
6672                         ret = sctp_msg_append(stcb, net, m,
6673                             &ca->sndrcv, 1);
6674                 }
6675                 asoc = &stcb->asoc;
6676                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6677                         /* shutdown this assoc */
6678                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6679                             TAILQ_EMPTY(&asoc->sent_queue) &&
6680                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6681                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6682                                         goto abort_anyway;
6683                                 }
6684                                 /*
6685                                  * there is nothing queued to send, so I'm
6686                                  * done...
6687                                  */
6688                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6689                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6690                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6691                                         /*
6692                                          * only send SHUTDOWN the first time
6693                                          * through
6694                                          */
6695                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6696                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6697                                         }
6698                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6699                                         sctp_stop_timers_for_shutdown(stcb);
6700                                         sctp_send_shutdown(stcb, net);
6701                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6702                                             net);
6703                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6704                                             asoc->primary_destination);
6705                                         added_control = 1;
6706                                         do_chunk_output = 0;
6707                                 }
6708                         } else {
6709                                 /*
6710                                  * we still got (or just got) data to send,
6711                                  * so set SHUTDOWN_PENDING
6712                                  */
6713                                 /*
6714                                  * XXX sockets draft says that SCTP_EOF
6715                                  * should be sent with no data.  currently,
6716                                  * we will allow user data to be sent first
6717                                  * and move to SHUTDOWN-PENDING
6718                                  */
6719                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6720                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6721                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6722                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6723                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6724                                         }
6725                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6726                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6727                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6728                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6729                                                 struct mbuf *op_err;
6730                                                 char msg[SCTP_DIAG_INFO_LEN];
6731
6732                                 abort_anyway:
6733                                                 snprintf(msg, sizeof(msg),
6734                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6735                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6736                                                     msg);
6737                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6738                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6739                                                     op_err, SCTP_SO_NOT_LOCKED);
6740                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6741                                                 goto no_chunk_output;
6742                                         }
6743                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6744                                             asoc->primary_destination);
6745                                 }
6746                         }
6747
6748                 }
6749         }
6750         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6751             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6752
6753         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6754             (stcb->asoc.total_flight > 0) &&
6755             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6756                 do_chunk_output = 0;
6757         }
6758         if (do_chunk_output)
6759                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6760         else if (added_control) {
6761                 int num_out, reason, now_filled = 0;
6762                 struct timeval now;
6763                 int frag_point;
6764
6765                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6766                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6767                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6768         }
6769 no_chunk_output:
6770         if (ret) {
6771                 ca->cnt_failed++;
6772         } else {
6773                 ca->cnt_sent++;
6774         }
6775 }
6776
6777 static void
6778 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6779 {
6780         struct sctp_copy_all *ca;
6781
6782         ca = (struct sctp_copy_all *)ptr;
6783         /*
6784          * Do a notify here? Kacheong suggests that the notify be done at
6785          * the send time.. so you would push up a notification if any send
6786          * failed. Don't know if this is feasible since the only failures we
6787          * have is "memory" related and if you cannot get an mbuf to send
6788          * the data you surely can't get an mbuf to send up to notify the
6789          * user you can't send the data :->
6790          */
6791
6792         /* now free everything */
6793         if (ca->inp) {
6794                 /* Lets clear the flag to allow others to run. */
6795                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6796         }
6797         sctp_m_freem(ca->m);
6798         SCTP_FREE(ca, SCTP_M_COPYAL);
6799 }
6800
6801 static struct mbuf *
6802 sctp_copy_out_all(struct uio *uio, ssize_t len)
6803 {
6804         struct mbuf *ret, *at;
6805         ssize_t left, willcpy, cancpy, error;
6806
6807         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6808         if (ret == NULL) {
6809                 /* TSNH */
6810                 return (NULL);
6811         }
6812         left = len;
6813         SCTP_BUF_LEN(ret) = 0;
6814         /* save space for the data chunk header */
6815         cancpy = (int)M_TRAILINGSPACE(ret);
6816         willcpy = min(cancpy, left);
6817         at = ret;
6818         while (left > 0) {
6819                 /* Align data to the end */
6820                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6821                 if (error) {
6822         err_out_now:
6823                         sctp_m_freem(at);
6824                         return (NULL);
6825                 }
6826                 SCTP_BUF_LEN(at) = (int)willcpy;
6827                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6828                 left -= willcpy;
6829                 if (left > 0) {
6830                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6831                         if (SCTP_BUF_NEXT(at) == NULL) {
6832                                 goto err_out_now;
6833                         }
6834                         at = SCTP_BUF_NEXT(at);
6835                         SCTP_BUF_LEN(at) = 0;
6836                         cancpy = (int)M_TRAILINGSPACE(at);
6837                         willcpy = min(cancpy, left);
6838                 }
6839         }
6840         return (ret);
6841 }
6842
6843 static int
6844 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6845     struct sctp_sndrcvinfo *srcv)
6846 {
6847         int ret;
6848         struct sctp_copy_all *ca;
6849
6850         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6851                 /* There is another. */
6852                 return (EBUSY);
6853         }
6854         if (uio->uio_resid > SCTP_MAX_SENDALL_LIMIT) {
6855                 /* You must be less than the max! */
6856                 return (EMSGSIZE);
6857         }
6858         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6859             SCTP_M_COPYAL);
6860         if (ca == NULL) {
6861                 sctp_m_freem(m);
6862                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6863                 return (ENOMEM);
6864         }
6865         memset(ca, 0, sizeof(struct sctp_copy_all));
6866
6867         ca->inp = inp;
6868         if (srcv) {
6869                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6870         }
6871         /*
6872          * take off the sendall flag, it would be bad if we failed to do
6873          * this :-0
6874          */
6875         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6876         /* get length and mbuf chain */
6877         if (uio) {
6878                 ca->sndlen = uio->uio_resid;
6879                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6880                 if (ca->m == NULL) {
6881                         SCTP_FREE(ca, SCTP_M_COPYAL);
6882                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6883                         return (ENOMEM);
6884                 }
6885         } else {
6886                 /* Gather the length of the send */
6887                 struct mbuf *mat;
6888
6889                 ca->sndlen = 0;
6890                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6891                         ca->sndlen += SCTP_BUF_LEN(mat);
6892                 }
6893         }
6894         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6895         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6896             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6897             SCTP_ASOC_ANY_STATE,
6898             (void *)ca, 0,
6899             sctp_sendall_completes, inp, 1);
6900         if (ret) {
6901                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6902                 SCTP_FREE(ca, SCTP_M_COPYAL);
6903                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6904                 return (EFAULT);
6905         }
6906         return (0);
6907 }
6908
6909
6910 void
6911 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6912 {
6913         struct sctp_tmit_chunk *chk, *nchk;
6914
6915         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6916                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6917                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6918                         asoc->ctrl_queue_cnt--;
6919                         if (chk->data) {
6920                                 sctp_m_freem(chk->data);
6921                                 chk->data = NULL;
6922                         }
6923                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6924                 }
6925         }
6926 }
6927
6928 void
6929 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6930 {
6931         struct sctp_association *asoc;
6932         struct sctp_tmit_chunk *chk, *nchk;
6933         struct sctp_asconf_chunk *acp;
6934
6935         asoc = &stcb->asoc;
6936         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6937                 /* find SCTP_ASCONF chunk in queue */
6938                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6939                         if (chk->data) {
6940                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6941                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6942                                         /* Not Acked yet */
6943                                         break;
6944                                 }
6945                         }
6946                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6947                         asoc->ctrl_queue_cnt--;
6948                         if (chk->data) {
6949                                 sctp_m_freem(chk->data);
6950                                 chk->data = NULL;
6951                         }
6952                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6953                 }
6954         }
6955 }
6956
6957
6958 static void
6959 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6960     struct sctp_association *asoc,
6961     struct sctp_tmit_chunk **data_list,
6962     int bundle_at,
6963     struct sctp_nets *net)
6964 {
6965         int i;
6966         struct sctp_tmit_chunk *tp1;
6967
6968         for (i = 0; i < bundle_at; i++) {
6969                 /* off of the send queue */
6970                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6971                 asoc->send_queue_cnt--;
6972                 if (i > 0) {
6973                         /*
6974                          * Any chunk NOT 0 you zap the time chunk 0 gets
6975                          * zapped or set based on if a RTO measurment is
6976                          * needed.
6977                          */
6978                         data_list[i]->do_rtt = 0;
6979                 }
6980                 /* record time */
6981                 data_list[i]->sent_rcv_time = net->last_sent_time;
6982                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6983                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6984                 if (data_list[i]->whoTo == NULL) {
6985                         data_list[i]->whoTo = net;
6986                         atomic_add_int(&net->ref_count, 1);
6987                 }
6988                 /* on to the sent queue */
6989                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6990                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6991                         struct sctp_tmit_chunk *tpp;
6992
6993                         /* need to move back */
6994         back_up_more:
6995                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6996                         if (tpp == NULL) {
6997                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6998                                 goto all_done;
6999                         }
7000                         tp1 = tpp;
7001                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7002                                 goto back_up_more;
7003                         }
7004                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7005                 } else {
7006                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7007                             data_list[i],
7008                             sctp_next);
7009                 }
7010 all_done:
7011                 /* This does not lower until the cum-ack passes it */
7012                 asoc->sent_queue_cnt++;
7013                 if ((asoc->peers_rwnd <= 0) &&
7014                     (asoc->total_flight == 0) &&
7015                     (bundle_at == 1)) {
7016                         /* Mark the chunk as being a window probe */
7017                         SCTP_STAT_INCR(sctps_windowprobed);
7018                 }
7019 #ifdef SCTP_AUDITING_ENABLED
7020                 sctp_audit_log(0xC2, 3);
7021 #endif
7022                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7023                 data_list[i]->snd_count = 1;
7024                 data_list[i]->rec.data.chunk_was_revoked = 0;
7025                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7026                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7027                             data_list[i]->whoTo->flight_size,
7028                             data_list[i]->book_size,
7029                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7030                             data_list[i]->rec.data.tsn);
7031                 }
7032                 sctp_flight_size_increase(data_list[i]);
7033                 sctp_total_flight_increase(stcb, data_list[i]);
7034                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7035                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7036                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7037                 }
7038                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7039                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7040                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7041                         /* SWS sender side engages */
7042                         asoc->peers_rwnd = 0;
7043                 }
7044         }
7045         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7046                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7047         }
7048 }
7049
7050 static void
7051 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7052 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7053     SCTP_UNUSED
7054 #endif
7055 )
7056 {
7057         struct sctp_tmit_chunk *chk, *nchk;
7058
7059         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7060                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7062                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7063                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7064                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7065                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7066                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7067                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7068                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7069                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7070                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7071                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7072                         /* Stray chunks must be cleaned up */
7073         clean_up_anyway:
7074                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7075                         asoc->ctrl_queue_cnt--;
7076                         if (chk->data) {
7077                                 sctp_m_freem(chk->data);
7078                                 chk->data = NULL;
7079                         }
7080                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7081                                 asoc->fwd_tsn_cnt--;
7082                         }
7083                         sctp_free_a_chunk(stcb, chk, so_locked);
7084                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7085                         /* special handling, we must look into the param */
7086                         if (chk != asoc->str_reset) {
7087                                 goto clean_up_anyway;
7088                         }
7089                 }
7090         }
7091 }
7092
7093 static uint32_t
7094 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7095     uint32_t space_left, uint32_t frag_point, int eeor_on)
7096 {
7097         /*
7098          * Make a decision on if I should split a msg into multiple parts.
7099          * This is only asked of incomplete messages.
7100          */
7101         if (eeor_on) {
7102                 /*
7103                  * If we are doing EEOR we need to always send it if its the
7104                  * entire thing, since it might be all the guy is putting in
7105                  * the hopper.
7106                  */
7107                 if (space_left >= length) {
7108                         /*-
7109                          * If we have data outstanding,
7110                          * we get another chance when the sack
7111                          * arrives to transmit - wait for more data
7112                          */
7113                         if (stcb->asoc.total_flight == 0) {
7114                                 /*
7115                                  * If nothing is in flight, we zero the
7116                                  * packet counter.
7117                                  */
7118                                 return (length);
7119                         }
7120                         return (0);
7121
7122                 } else {
7123                         /* You can fill the rest */
7124                         return (space_left);
7125                 }
7126         }
7127         /*-
7128          * For those strange folk that make the send buffer
7129          * smaller than our fragmentation point, we can't
7130          * get a full msg in so we have to allow splitting.
7131          */
7132         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7133                 return (length);
7134         }
7135         if ((length <= space_left) ||
7136             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7137                 /* Sub-optimial residual don't split in non-eeor mode. */
7138                 return (0);
7139         }
7140         /*
7141          * If we reach here length is larger than the space_left. Do we wish
7142          * to split it for the sake of packet putting together?
7143          */
7144         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7145                 /* Its ok to split it */
7146                 return (min(space_left, frag_point));
7147         }
7148         /* Nope, can't split */
7149         return (0);
7150 }
7151
7152 static uint32_t
7153 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7154     struct sctp_stream_out *strq,
7155     uint32_t space_left,
7156     uint32_t frag_point,
7157     int *giveup,
7158     int eeor_mode,
7159     int *bail,
7160     int so_locked
7161 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7162     SCTP_UNUSED
7163 #endif
7164 )
7165 {
7166         /* Move from the stream to the send_queue keeping track of the total */
7167         struct sctp_association *asoc;
7168         struct sctp_stream_queue_pending *sp;
7169         struct sctp_tmit_chunk *chk;
7170         struct sctp_data_chunk *dchkh = NULL;
7171         struct sctp_idata_chunk *ndchkh = NULL;
7172         uint32_t to_move, length;
7173         int leading;
7174         uint8_t rcv_flags = 0;
7175         uint8_t some_taken;
7176         uint8_t send_lock_up = 0;
7177
7178         SCTP_TCB_LOCK_ASSERT(stcb);
7179         asoc = &stcb->asoc;
7180 one_more_time:
7181         /* sa_ignore FREED_MEMORY */
7182         sp = TAILQ_FIRST(&strq->outqueue);
7183         if (sp == NULL) {
7184                 if (send_lock_up == 0) {
7185                         SCTP_TCB_SEND_LOCK(stcb);
7186                         send_lock_up = 1;
7187                 }
7188                 sp = TAILQ_FIRST(&strq->outqueue);
7189                 if (sp) {
7190                         goto one_more_time;
7191                 }
7192                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7193                     (stcb->asoc.idata_supported == 0) &&
7194                     (strq->last_msg_incomplete)) {
7195                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7196                             strq->sid,
7197                             strq->last_msg_incomplete);
7198                         strq->last_msg_incomplete = 0;
7199                 }
7200                 to_move = 0;
7201                 if (send_lock_up) {
7202                         SCTP_TCB_SEND_UNLOCK(stcb);
7203                         send_lock_up = 0;
7204                 }
7205                 goto out_of;
7206         }
7207         if ((sp->msg_is_complete) && (sp->length == 0)) {
7208                 if (sp->sender_all_done) {
7209                         /*
7210                          * We are doing deferred cleanup. Last time through
7211                          * when we took all the data the sender_all_done was
7212                          * not set.
7213                          */
7214                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7215                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7216                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7217                                     sp->sender_all_done,
7218                                     sp->length,
7219                                     sp->msg_is_complete,
7220                                     sp->put_last_out,
7221                                     send_lock_up);
7222                         }
7223                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7224                                 SCTP_TCB_SEND_LOCK(stcb);
7225                                 send_lock_up = 1;
7226                         }
7227                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7228                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7229                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7230                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7231                             (strq->chunks_on_queues == 0) &&
7232                             TAILQ_EMPTY(&strq->outqueue)) {
7233                                 stcb->asoc.trigger_reset = 1;
7234                         }
7235                         if (sp->net) {
7236                                 sctp_free_remote_addr(sp->net);
7237                                 sp->net = NULL;
7238                         }
7239                         if (sp->data) {
7240                                 sctp_m_freem(sp->data);
7241                                 sp->data = NULL;
7242                         }
7243                         sctp_free_a_strmoq(stcb, sp, so_locked);
7244                         /* we can't be locked to it */
7245                         if (send_lock_up) {
7246                                 SCTP_TCB_SEND_UNLOCK(stcb);
7247                                 send_lock_up = 0;
7248                         }
7249                         /* back to get the next msg */
7250                         goto one_more_time;
7251                 } else {
7252                         /*
7253                          * sender just finished this but still holds a
7254                          * reference
7255                          */
7256                         *giveup = 1;
7257                         to_move = 0;
7258                         goto out_of;
7259                 }
7260         } else {
7261                 /* is there some to get */
7262                 if (sp->length == 0) {
7263                         /* no */
7264                         *giveup = 1;
7265                         to_move = 0;
7266                         goto out_of;
7267                 } else if (sp->discard_rest) {
7268                         if (send_lock_up == 0) {
7269                                 SCTP_TCB_SEND_LOCK(stcb);
7270                                 send_lock_up = 1;
7271                         }
7272                         /* Whack down the size */
7273                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7274                         if ((stcb->sctp_socket != NULL) &&
7275                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7276                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7277                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7278                         }
7279                         if (sp->data) {
7280                                 sctp_m_freem(sp->data);
7281                                 sp->data = NULL;
7282                                 sp->tail_mbuf = NULL;
7283                         }
7284                         sp->length = 0;
7285                         sp->some_taken = 1;
7286                         *giveup = 1;
7287                         to_move = 0;
7288                         goto out_of;
7289                 }
7290         }
7291         some_taken = sp->some_taken;
7292 re_look:
7293         length = sp->length;
7294         if (sp->msg_is_complete) {
7295                 /* The message is complete */
7296                 to_move = min(length, frag_point);
7297                 if (to_move == length) {
7298                         /* All of it fits in the MTU */
7299                         if (sp->some_taken) {
7300                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7301                         } else {
7302                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7303                         }
7304                         sp->put_last_out = 1;
7305                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7306                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7307                         }
7308                 } else {
7309                         /* Not all of it fits, we fragment */
7310                         if (sp->some_taken == 0) {
7311                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7312                         }
7313                         sp->some_taken = 1;
7314                 }
7315         } else {
7316                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7317                 if (to_move) {
7318                         /*-
7319                          * We use a snapshot of length in case it
7320                          * is expanding during the compare.
7321                          */
7322                         uint32_t llen;
7323
7324                         llen = length;
7325                         if (to_move >= llen) {
7326                                 to_move = llen;
7327                                 if (send_lock_up == 0) {
7328                                         /*-
7329                                          * We are taking all of an incomplete msg
7330                                          * thus we need a send lock.
7331                                          */
7332                                         SCTP_TCB_SEND_LOCK(stcb);
7333                                         send_lock_up = 1;
7334                                         if (sp->msg_is_complete) {
7335                                                 /*
7336                                                  * the sender finished the
7337                                                  * msg
7338                                                  */
7339                                                 goto re_look;
7340                                         }
7341                                 }
7342                         }
7343                         if (sp->some_taken == 0) {
7344                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7345                                 sp->some_taken = 1;
7346                         }
7347                 } else {
7348                         /* Nothing to take. */
7349                         *giveup = 1;
7350                         to_move = 0;
7351                         goto out_of;
7352                 }
7353         }
7354
7355         /* If we reach here, we can copy out a chunk */
7356         sctp_alloc_a_chunk(stcb, chk);
7357         if (chk == NULL) {
7358                 /* No chunk memory */
7359                 *giveup = 1;
7360                 to_move = 0;
7361                 goto out_of;
7362         }
7363         /*
7364          * Setup for unordered if needed by looking at the user sent info
7365          * flags.
7366          */
7367         if (sp->sinfo_flags & SCTP_UNORDERED) {
7368                 rcv_flags |= SCTP_DATA_UNORDERED;
7369         }
7370         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7371             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7372                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7373         }
7374         /* clear out the chunk before setting up */
7375         memset(chk, 0, sizeof(*chk));
7376         chk->rec.data.rcv_flags = rcv_flags;
7377
7378         if (to_move >= length) {
7379                 /* we think we can steal the whole thing */
7380                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7381                         SCTP_TCB_SEND_LOCK(stcb);
7382                         send_lock_up = 1;
7383                 }
7384                 if (to_move < sp->length) {
7385                         /* bail, it changed */
7386                         goto dont_do_it;
7387                 }
7388                 chk->data = sp->data;
7389                 chk->last_mbuf = sp->tail_mbuf;
7390                 /* register the stealing */
7391                 sp->data = sp->tail_mbuf = NULL;
7392         } else {
7393                 struct mbuf *m;
7394
7395 dont_do_it:
7396                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7397                 chk->last_mbuf = NULL;
7398                 if (chk->data == NULL) {
7399                         sp->some_taken = some_taken;
7400                         sctp_free_a_chunk(stcb, chk, so_locked);
7401                         *bail = 1;
7402                         to_move = 0;
7403                         goto out_of;
7404                 }
7405 #ifdef SCTP_MBUF_LOGGING
7406                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7407                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7408                 }
7409 #endif
7410                 /* Pull off the data */
7411                 m_adj(sp->data, to_move);
7412                 /* Now lets work our way down and compact it */
7413                 m = sp->data;
7414                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7415                         sp->data = SCTP_BUF_NEXT(m);
7416                         SCTP_BUF_NEXT(m) = NULL;
7417                         if (sp->tail_mbuf == m) {
7418                                 /*-
7419                                  * Freeing tail? TSNH since
7420                                  * we supposedly were taking less
7421                                  * than the sp->length.
7422                                  */
7423 #ifdef INVARIANTS
7424                                 panic("Huh, freing tail? - TSNH");
7425 #else
7426                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7427                                 sp->tail_mbuf = sp->data = NULL;
7428                                 sp->length = 0;
7429 #endif
7430
7431                         }
7432                         sctp_m_free(m);
7433                         m = sp->data;
7434                 }
7435         }
7436         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7437                 chk->copy_by_ref = 1;
7438         } else {
7439                 chk->copy_by_ref = 0;
7440         }
7441         /*
7442          * get last_mbuf and counts of mb usage This is ugly but hopefully
7443          * its only one mbuf.
7444          */
7445         if (chk->last_mbuf == NULL) {
7446                 chk->last_mbuf = chk->data;
7447                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7448                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7449                 }
7450         }
7451
7452         if (to_move > length) {
7453                 /*- This should not happen either
7454                  * since we always lower to_move to the size
7455                  * of sp->length if its larger.
7456                  */
7457 #ifdef INVARIANTS
7458                 panic("Huh, how can to_move be larger?");
7459 #else
7460                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7461                 sp->length = 0;
7462 #endif
7463         } else {
7464                 atomic_subtract_int(&sp->length, to_move);
7465         }
7466         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7467         if (M_LEADINGSPACE(chk->data) < leading) {
7468                 /* Not enough room for a chunk header, get some */
7469                 struct mbuf *m;
7470
7471                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7472                 if (m == NULL) {
7473                         /*
7474                          * we're in trouble here. _PREPEND below will free
7475                          * all the data if there is no leading space, so we
7476                          * must put the data back and restore.
7477                          */
7478                         if (send_lock_up == 0) {
7479                                 SCTP_TCB_SEND_LOCK(stcb);
7480                                 send_lock_up = 1;
7481                         }
7482                         if (sp->data == NULL) {
7483                                 /* unsteal the data */
7484                                 sp->data = chk->data;
7485                                 sp->tail_mbuf = chk->last_mbuf;
7486                         } else {
7487                                 struct mbuf *m_tmp;
7488
7489                                 /* reassemble the data */
7490                                 m_tmp = sp->data;
7491                                 sp->data = chk->data;
7492                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7493                         }
7494                         sp->some_taken = some_taken;
7495                         atomic_add_int(&sp->length, to_move);
7496                         chk->data = NULL;
7497                         *bail = 1;
7498                         sctp_free_a_chunk(stcb, chk, so_locked);
7499                         to_move = 0;
7500                         goto out_of;
7501                 } else {
7502                         SCTP_BUF_LEN(m) = 0;
7503                         SCTP_BUF_NEXT(m) = chk->data;
7504                         chk->data = m;
7505                         M_ALIGN(chk->data, 4);
7506                 }
7507         }
7508         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7509         if (chk->data == NULL) {
7510                 /* HELP, TSNH since we assured it would not above? */
7511 #ifdef INVARIANTS
7512                 panic("prepend failes HELP?");
7513 #else
7514                 SCTP_PRINTF("prepend fails HELP?\n");
7515                 sctp_free_a_chunk(stcb, chk, so_locked);
7516 #endif
7517                 *bail = 1;
7518                 to_move = 0;
7519                 goto out_of;
7520         }
7521         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7522         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7523         chk->book_size_scale = 0;
7524         chk->sent = SCTP_DATAGRAM_UNSENT;
7525
7526         chk->flags = 0;
7527         chk->asoc = &stcb->asoc;
7528         chk->pad_inplace = 0;
7529         chk->no_fr_allowed = 0;
7530         if (stcb->asoc.idata_supported == 0) {
7531                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7532                         /* Just use 0. The receiver ignores the values. */
7533                         chk->rec.data.mid = 0;
7534                 } else {
7535                         chk->rec.data.mid = strq->next_mid_ordered;
7536                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7537                                 strq->next_mid_ordered++;
7538                         }
7539                 }
7540         } else {
7541                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7542                         chk->rec.data.mid = strq->next_mid_unordered;
7543                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7544                                 strq->next_mid_unordered++;
7545                         }
7546                 } else {
7547                         chk->rec.data.mid = strq->next_mid_ordered;
7548                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7549                                 strq->next_mid_ordered++;
7550                         }
7551                 }
7552         }
7553         chk->rec.data.sid = sp->sid;
7554         chk->rec.data.ppid = sp->ppid;
7555         chk->rec.data.context = sp->context;
7556         chk->rec.data.doing_fast_retransmit = 0;
7557
7558         chk->rec.data.timetodrop = sp->ts;
7559         chk->flags = sp->act_flags;
7560
7561         if (sp->net) {
7562                 chk->whoTo = sp->net;
7563                 atomic_add_int(&chk->whoTo->ref_count, 1);
7564         } else
7565                 chk->whoTo = NULL;
7566
7567         if (sp->holds_key_ref) {
7568                 chk->auth_keyid = sp->auth_keyid;
7569                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7570                 chk->holds_key_ref = 1;
7571         }
7572         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7573         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7574                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7575                     (uint32_t)(uintptr_t)stcb, sp->length,
7576                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7577                     chk->rec.data.tsn);
7578         }
7579         if (stcb->asoc.idata_supported == 0) {
7580                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7581         } else {
7582                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7583         }
7584         /*
7585          * Put the rest of the things in place now. Size was done earlier in
7586          * previous loop prior to padding.
7587          */
7588
7589 #ifdef SCTP_ASOCLOG_OF_TSNS
7590         SCTP_TCB_LOCK_ASSERT(stcb);
7591         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7592                 asoc->tsn_out_at = 0;
7593                 asoc->tsn_out_wrapped = 1;
7594         }
7595         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7596         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7597         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7598         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7599         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7600         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7601         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7602         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7603         asoc->tsn_out_at++;
7604 #endif
7605         if (stcb->asoc.idata_supported == 0) {
7606                 dchkh->ch.chunk_type = SCTP_DATA;
7607                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7608                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7609                 dchkh->dp.sid = htons(strq->sid);
7610                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7611                 dchkh->dp.ppid = chk->rec.data.ppid;
7612                 dchkh->ch.chunk_length = htons(chk->send_size);
7613         } else {
7614                 ndchkh->ch.chunk_type = SCTP_IDATA;
7615                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7616                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7617                 ndchkh->dp.sid = htons(strq->sid);
7618                 ndchkh->dp.reserved = htons(0);
7619                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7620                 if (sp->fsn == 0)
7621                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7622                 else
7623                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7624                 sp->fsn++;
7625                 ndchkh->ch.chunk_length = htons(chk->send_size);
7626         }
7627         /* Now advance the chk->send_size by the actual pad needed. */
7628         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7629                 /* need a pad */
7630                 struct mbuf *lm;
7631                 int pads;
7632
7633                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7634                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7635                 if (lm != NULL) {
7636                         chk->last_mbuf = lm;
7637                         chk->pad_inplace = 1;
7638                 }
7639                 chk->send_size += pads;
7640         }
7641         if (PR_SCTP_ENABLED(chk->flags)) {
7642                 asoc->pr_sctp_cnt++;
7643         }
7644         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7645                 /* All done pull and kill the message */
7646                 if (sp->put_last_out == 0) {
7647                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7648                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7649                             sp->sender_all_done,
7650                             sp->length,
7651                             sp->msg_is_complete,
7652                             sp->put_last_out,
7653                             send_lock_up);
7654                 }
7655                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7656                         SCTP_TCB_SEND_LOCK(stcb);
7657                         send_lock_up = 1;
7658                 }
7659                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7660                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7661                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7662                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7663                     (strq->chunks_on_queues == 0) &&
7664                     TAILQ_EMPTY(&strq->outqueue)) {
7665                         stcb->asoc.trigger_reset = 1;
7666                 }
7667                 if (sp->net) {
7668                         sctp_free_remote_addr(sp->net);
7669                         sp->net = NULL;
7670                 }
7671                 if (sp->data) {
7672                         sctp_m_freem(sp->data);
7673                         sp->data = NULL;
7674                 }
7675                 sctp_free_a_strmoq(stcb, sp, so_locked);
7676         }
7677         asoc->chunks_on_out_queue++;
7678         strq->chunks_on_queues++;
7679         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7680         asoc->send_queue_cnt++;
7681 out_of:
7682         if (send_lock_up) {
7683                 SCTP_TCB_SEND_UNLOCK(stcb);
7684         }
7685         return (to_move);
7686 }
7687
7688
7689 static void
7690 sctp_fill_outqueue(struct sctp_tcb *stcb,
7691     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7692 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7693     SCTP_UNUSED
7694 #endif
7695 )
7696 {
7697         struct sctp_association *asoc;
7698         struct sctp_stream_out *strq;
7699         uint32_t space_left, moved, total_moved;
7700         int bail, giveup;
7701
7702         SCTP_TCB_LOCK_ASSERT(stcb);
7703         asoc = &stcb->asoc;
7704         total_moved = 0;
7705         switch (net->ro._l_addr.sa.sa_family) {
7706 #ifdef INET
7707         case AF_INET:
7708                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7709                 break;
7710 #endif
7711 #ifdef INET6
7712         case AF_INET6:
7713                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7714                 break;
7715 #endif
7716         default:
7717                 /* TSNH */
7718                 space_left = net->mtu;
7719                 break;
7720         }
7721         /* Need an allowance for the data chunk header too */
7722         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7723
7724         /* must make even word boundary */
7725         space_left &= 0xfffffffc;
7726         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7727         giveup = 0;
7728         bail = 0;
7729         while ((space_left > 0) && (strq != NULL)) {
7730                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7731                     &giveup, eeor_mode, &bail, so_locked);
7732                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7733                 if ((giveup != 0) || (bail != 0)) {
7734                         break;
7735                 }
7736                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7737                 total_moved += moved;
7738                 space_left -= moved;
7739                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7740                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7741                 } else {
7742                         space_left = 0;
7743                 }
7744                 space_left &= 0xfffffffc;
7745         }
7746         if (bail != 0)
7747                 *quit_now = 1;
7748
7749         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7750
7751         if (total_moved == 0) {
7752                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7753                     (net == stcb->asoc.primary_destination)) {
7754                         /* ran dry for primary network net */
7755                         SCTP_STAT_INCR(sctps_primary_randry);
7756                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7757                         /* ran dry with CMT on */
7758                         SCTP_STAT_INCR(sctps_cmt_randry);
7759                 }
7760         }
7761 }
7762
7763 void
7764 sctp_fix_ecn_echo(struct sctp_association *asoc)
7765 {
7766         struct sctp_tmit_chunk *chk;
7767
7768         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7769                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7770                         chk->sent = SCTP_DATAGRAM_UNSENT;
7771                 }
7772         }
7773 }
7774
7775 void
7776 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7777 {
7778         struct sctp_association *asoc;
7779         struct sctp_tmit_chunk *chk;
7780         struct sctp_stream_queue_pending *sp;
7781         unsigned int i;
7782
7783         if (net == NULL) {
7784                 return;
7785         }
7786         asoc = &stcb->asoc;
7787         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7788                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7789                         if (sp->net == net) {
7790                                 sctp_free_remote_addr(sp->net);
7791                                 sp->net = NULL;
7792                         }
7793                 }
7794         }
7795         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7796                 if (chk->whoTo == net) {
7797                         sctp_free_remote_addr(chk->whoTo);
7798                         chk->whoTo = NULL;
7799                 }
7800         }
7801 }
7802
7803 int
7804 sctp_med_chunk_output(struct sctp_inpcb *inp,
7805     struct sctp_tcb *stcb,
7806     struct sctp_association *asoc,
7807     int *num_out,
7808     int *reason_code,
7809     int control_only, int from_where,
7810     struct timeval *now, int *now_filled, int frag_point, int so_locked
7811 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7812     SCTP_UNUSED
7813 #endif
7814 )
7815 {
7816         /**
7817          * Ok this is the generic chunk service queue. we must do the
7818          * following:
7819          * - Service the stream queue that is next, moving any
7820          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7821          *   LAST to the out queue in one pass) and assigning TSN's. This
7822          *   only applys though if the peer does not support NDATA. For NDATA
7823          *   chunks its ok to not send the entire message ;-)
7824          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7825          *   fomulate and send the low level chunks. Making sure to combine
7826          *   any control in the control chunk queue also.
7827          */
7828         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7829         struct mbuf *outchain, *endoutchain;
7830         struct sctp_tmit_chunk *chk, *nchk;
7831
7832         /* temp arrays for unlinking */
7833         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7834         int no_fragmentflg, error;
7835         unsigned int max_rwnd_per_dest, max_send_per_dest;
7836         int one_chunk, hbflag, skip_data_for_this_net;
7837         int asconf, cookie, no_out_cnt;
7838         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7839         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7840         int tsns_sent = 0;
7841         uint32_t auth_offset = 0;
7842         struct sctp_auth_chunk *auth = NULL;
7843         uint16_t auth_keyid;
7844         int override_ok = 1;
7845         int skip_fill_up = 0;
7846         int data_auth_reqd = 0;
7847
7848         /*
7849          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7850          * destination.
7851          */
7852         int quit_now = 0;
7853
7854         *num_out = 0;
7855         *reason_code = 0;
7856         auth_keyid = stcb->asoc.authinfo.active_keyid;
7857         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7858             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7859             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7860                 eeor_mode = 1;
7861         } else {
7862                 eeor_mode = 0;
7863         }
7864         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7865         /*
7866          * First lets prime the pump. For each destination, if there is room
7867          * in the flight size, attempt to pull an MTU's worth out of the
7868          * stream queues into the general send_queue
7869          */
7870 #ifdef SCTP_AUDITING_ENABLED
7871         sctp_audit_log(0xC2, 2);
7872 #endif
7873         SCTP_TCB_LOCK_ASSERT(stcb);
7874         hbflag = 0;
7875         if (control_only)
7876                 no_data_chunks = 1;
7877         else
7878                 no_data_chunks = 0;
7879
7880         /* Nothing to possible to send? */
7881         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7882             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7883             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7884             TAILQ_EMPTY(&asoc->send_queue) &&
7885             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7886 nothing_to_send:
7887                 *reason_code = 9;
7888                 return (0);
7889         }
7890         if (asoc->peers_rwnd == 0) {
7891                 /* No room in peers rwnd */
7892                 *reason_code = 1;
7893                 if (asoc->total_flight > 0) {
7894                         /* we are allowed one chunk in flight */
7895                         no_data_chunks = 1;
7896                 }
7897         }
7898         if (stcb->asoc.ecn_echo_cnt_onq) {
7899                 /* Record where a sack goes, if any */
7900                 if (no_data_chunks &&
7901                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7902                         /* Nothing but ECNe to send - we don't do that */
7903                         goto nothing_to_send;
7904                 }
7905                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7906                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7907                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7908                                 sack_goes_to = chk->whoTo;
7909                                 break;
7910                         }
7911                 }
7912         }
7913         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7914         if (stcb->sctp_socket)
7915                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7916         else
7917                 max_send_per_dest = 0;
7918         if (no_data_chunks == 0) {
7919                 /* How many non-directed chunks are there? */
7920                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7921                         if (chk->whoTo == NULL) {
7922                                 /*
7923                                  * We already have non-directed chunks on
7924                                  * the queue, no need to do a fill-up.
7925                                  */
7926                                 skip_fill_up = 1;
7927                                 break;
7928                         }
7929                 }
7930
7931         }
7932         if ((no_data_chunks == 0) &&
7933             (skip_fill_up == 0) &&
7934             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7935                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7936                         /*
7937                          * This for loop we are in takes in each net, if
7938                          * its's got space in cwnd and has data sent to it
7939                          * (when CMT is off) then it calls
7940                          * sctp_fill_outqueue for the net. This gets data on
7941                          * the send queue for that network.
7942                          *
7943                          * In sctp_fill_outqueue TSN's are assigned and data
7944                          * is copied out of the stream buffers. Note mostly
7945                          * copy by reference (we hope).
7946                          */
7947                         net->window_probe = 0;
7948                         if ((net != stcb->asoc.alternate) &&
7949                             ((net->dest_state & SCTP_ADDR_PF) ||
7950                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7951                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7952                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7953                                         sctp_log_cwnd(stcb, net, 1,
7954                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7955                                 }
7956                                 continue;
7957                         }
7958                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7959                             (net->flight_size == 0)) {
7960                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7961                         }
7962                         if (net->flight_size >= net->cwnd) {
7963                                 /* skip this network, no room - can't fill */
7964                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7965                                         sctp_log_cwnd(stcb, net, 3,
7966                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7967                                 }
7968                                 continue;
7969                         }
7970                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7971                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7972                         }
7973                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7974                         if (quit_now) {
7975                                 /* memory alloc failure */
7976                                 no_data_chunks = 1;
7977                                 break;
7978                         }
7979                 }
7980         }
7981         /* now service each destination and send out what we can for it */
7982         /* Nothing to send? */
7983         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7984             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7985             TAILQ_EMPTY(&asoc->send_queue)) {
7986                 *reason_code = 8;
7987                 return (0);
7988         }
7989
7990         if (asoc->sctp_cmt_on_off > 0) {
7991                 /* get the last start point */
7992                 start_at = asoc->last_net_cmt_send_started;
7993                 if (start_at == NULL) {
7994                         /* null so to beginning */
7995                         start_at = TAILQ_FIRST(&asoc->nets);
7996                 } else {
7997                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7998                         if (start_at == NULL) {
7999                                 start_at = TAILQ_FIRST(&asoc->nets);
8000                         }
8001                 }
8002                 asoc->last_net_cmt_send_started = start_at;
8003         } else {
8004                 start_at = TAILQ_FIRST(&asoc->nets);
8005         }
8006         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8007                 if (chk->whoTo == NULL) {
8008                         if (asoc->alternate) {
8009                                 chk->whoTo = asoc->alternate;
8010                         } else {
8011                                 chk->whoTo = asoc->primary_destination;
8012                         }
8013                         atomic_add_int(&chk->whoTo->ref_count, 1);
8014                 }
8015         }
8016         old_start_at = NULL;
8017 again_one_more_time:
8018         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8019                 /* how much can we send? */
8020                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8021                 if (old_start_at && (old_start_at == net)) {
8022                         /* through list ocmpletely. */
8023                         break;
8024                 }
8025                 tsns_sent = 0xa;
8026                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8027                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8028                     (net->flight_size >= net->cwnd)) {
8029                         /*
8030                          * Nothing on control or asconf and flight is full,
8031                          * we can skip even in the CMT case.
8032                          */
8033                         continue;
8034                 }
8035                 bundle_at = 0;
8036                 endoutchain = outchain = NULL;
8037                 no_fragmentflg = 1;
8038                 one_chunk = 0;
8039                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8040                         skip_data_for_this_net = 1;
8041                 } else {
8042                         skip_data_for_this_net = 0;
8043                 }
8044                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8045 #ifdef INET
8046                 case AF_INET:
8047                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8048                         break;
8049 #endif
8050 #ifdef INET6
8051                 case AF_INET6:
8052                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8053                         break;
8054 #endif
8055                 default:
8056                         /* TSNH */
8057                         mtu = net->mtu;
8058                         break;
8059                 }
8060                 mx_mtu = mtu;
8061                 to_out = 0;
8062                 if (mtu > asoc->peers_rwnd) {
8063                         if (asoc->total_flight > 0) {
8064                                 /* We have a packet in flight somewhere */
8065                                 r_mtu = asoc->peers_rwnd;
8066                         } else {
8067                                 /* We are always allowed to send one MTU out */
8068                                 one_chunk = 1;
8069                                 r_mtu = mtu;
8070                         }
8071                 } else {
8072                         r_mtu = mtu;
8073                 }
8074                 error = 0;
8075                 /************************/
8076                 /* ASCONF transmission */
8077                 /************************/
8078                 /* Now first lets go through the asconf queue */
8079                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8080                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8081                                 continue;
8082                         }
8083                         if (chk->whoTo == NULL) {
8084                                 if (asoc->alternate == NULL) {
8085                                         if (asoc->primary_destination != net) {
8086                                                 break;
8087                                         }
8088                                 } else {
8089                                         if (asoc->alternate != net) {
8090                                                 break;
8091                                         }
8092                                 }
8093                         } else {
8094                                 if (chk->whoTo != net) {
8095                                         break;
8096                                 }
8097                         }
8098                         if (chk->data == NULL) {
8099                                 break;
8100                         }
8101                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8102                             chk->sent != SCTP_DATAGRAM_RESEND) {
8103                                 break;
8104                         }
8105                         /*
8106                          * if no AUTH is yet included and this chunk
8107                          * requires it, make sure to account for it.  We
8108                          * don't apply the size until the AUTH chunk is
8109                          * actually added below in case there is no room for
8110                          * this chunk. NOTE: we overload the use of "omtu"
8111                          * here
8112                          */
8113                         if ((auth == NULL) &&
8114                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8115                             stcb->asoc.peer_auth_chunks)) {
8116                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8117                         } else
8118                                 omtu = 0;
8119                         /* Here we do NOT factor the r_mtu */
8120                         if ((chk->send_size < (int)(mtu - omtu)) ||
8121                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8122                                 /*
8123                                  * We probably should glom the mbuf chain
8124                                  * from the chk->data for control but the
8125                                  * problem is it becomes yet one more level
8126                                  * of tracking to do if for some reason
8127                                  * output fails. Then I have got to
8128                                  * reconstruct the merged control chain.. el
8129                                  * yucko.. for now we take the easy way and
8130                                  * do the copy
8131                                  */
8132                                 /*
8133                                  * Add an AUTH chunk, if chunk requires it
8134                                  * save the offset into the chain for AUTH
8135                                  */
8136                                 if ((auth == NULL) &&
8137                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8138                                     stcb->asoc.peer_auth_chunks))) {
8139                                         outchain = sctp_add_auth_chunk(outchain,
8140                                             &endoutchain,
8141                                             &auth,
8142                                             &auth_offset,
8143                                             stcb,
8144                                             chk->rec.chunk_id.id);
8145                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8146                                 }
8147                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8148                                     (int)chk->rec.chunk_id.can_take_data,
8149                                     chk->send_size, chk->copy_by_ref);
8150                                 if (outchain == NULL) {
8151                                         *reason_code = 8;
8152                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8153                                         return (ENOMEM);
8154                                 }
8155                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8156                                 /* update our MTU size */
8157                                 if (mtu > (chk->send_size + omtu))
8158                                         mtu -= (chk->send_size + omtu);
8159                                 else
8160                                         mtu = 0;
8161                                 to_out += (chk->send_size + omtu);
8162                                 /* Do clear IP_DF ? */
8163                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8164                                         no_fragmentflg = 0;
8165                                 }
8166                                 if (chk->rec.chunk_id.can_take_data)
8167                                         chk->data = NULL;
8168                                 /*
8169                                  * set hb flag since we can use these for
8170                                  * RTO
8171                                  */
8172                                 hbflag = 1;
8173                                 asconf = 1;
8174                                 /*
8175                                  * should sysctl this: don't bundle data
8176                                  * with ASCONF since it requires AUTH
8177                                  */
8178                                 no_data_chunks = 1;
8179                                 chk->sent = SCTP_DATAGRAM_SENT;
8180                                 if (chk->whoTo == NULL) {
8181                                         chk->whoTo = net;
8182                                         atomic_add_int(&net->ref_count, 1);
8183                                 }
8184                                 chk->snd_count++;
8185                                 if (mtu == 0) {
8186                                         /*
8187                                          * Ok we are out of room but we can
8188                                          * output without effecting the
8189                                          * flight size since this little guy
8190                                          * is a control only packet.
8191                                          */
8192                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8193                                         /*
8194                                          * do NOT clear the asconf flag as
8195                                          * it is used to do appropriate
8196                                          * source address selection.
8197                                          */
8198                                         if (*now_filled == 0) {
8199                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8200                                                 *now_filled = 1;
8201                                         }
8202                                         net->last_sent_time = *now;
8203                                         hbflag = 0;
8204                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8205                                             (struct sockaddr *)&net->ro._l_addr,
8206                                             outchain, auth_offset, auth,
8207                                             stcb->asoc.authinfo.active_keyid,
8208                                             no_fragmentflg, 0, asconf,
8209                                             inp->sctp_lport, stcb->rport,
8210                                             htonl(stcb->asoc.peer_vtag),
8211                                             net->port, NULL,
8212                                             0, 0,
8213                                             so_locked))) {
8214                                                 /*
8215                                                  * error, we could not
8216                                                  * output
8217                                                  */
8218                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8219                                                 if (from_where == 0) {
8220                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8221                                                 }
8222                                                 if (error == ENOBUFS) {
8223                                                         asoc->ifp_had_enobuf = 1;
8224                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8225                                                 }
8226                                                 /* error, could not output */
8227                                                 if (error == EHOSTUNREACH) {
8228                                                         /*
8229                                                          * Destination went
8230                                                          * unreachable
8231                                                          * during this send
8232                                                          */
8233                                                         sctp_move_chunks_from_net(stcb, net);
8234                                                 }
8235                                                 *reason_code = 7;
8236                                                 break;
8237                                         } else {
8238                                                 asoc->ifp_had_enobuf = 0;
8239                                         }
8240                                         /*
8241                                          * increase the number we sent, if a
8242                                          * cookie is sent we don't tell them
8243                                          * any was sent out.
8244                                          */
8245                                         outchain = endoutchain = NULL;
8246                                         auth = NULL;
8247                                         auth_offset = 0;
8248                                         if (!no_out_cnt)
8249                                                 *num_out += ctl_cnt;
8250                                         /* recalc a clean slate and setup */
8251                                         switch (net->ro._l_addr.sa.sa_family) {
8252 #ifdef INET
8253                                         case AF_INET:
8254                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8255                                                 break;
8256 #endif
8257 #ifdef INET6
8258                                         case AF_INET6:
8259                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8260                                                 break;
8261 #endif
8262                                         default:
8263                                                 /* TSNH */
8264                                                 mtu = net->mtu;
8265                                                 break;
8266                                         }
8267                                         to_out = 0;
8268                                         no_fragmentflg = 1;
8269                                 }
8270                         }
8271                 }
8272                 if (error != 0) {
8273                         /* try next net */
8274                         continue;
8275                 }
8276                 /************************/
8277                 /* Control transmission */
8278                 /************************/
8279                 /* Now first lets go through the control queue */
8280                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8281                         if ((sack_goes_to) &&
8282                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8283                             (chk->whoTo != sack_goes_to)) {
8284                                 /*
8285                                  * if we have a sack in queue, and we are
8286                                  * looking at an ecn echo that is NOT queued
8287                                  * to where the sack is going..
8288                                  */
8289                                 if (chk->whoTo == net) {
8290                                         /*
8291                                          * Don't transmit it to where its
8292                                          * going (current net)
8293                                          */
8294                                         continue;
8295                                 } else if (sack_goes_to == net) {
8296                                         /*
8297                                          * But do transmit it to this
8298                                          * address
8299                                          */
8300                                         goto skip_net_check;
8301                                 }
8302                         }
8303                         if (chk->whoTo == NULL) {
8304                                 if (asoc->alternate == NULL) {
8305                                         if (asoc->primary_destination != net) {
8306                                                 continue;
8307                                         }
8308                                 } else {
8309                                         if (asoc->alternate != net) {
8310                                                 continue;
8311                                         }
8312                                 }
8313                         } else {
8314                                 if (chk->whoTo != net) {
8315                                         continue;
8316                                 }
8317                         }
8318         skip_net_check:
8319                         if (chk->data == NULL) {
8320                                 continue;
8321                         }
8322                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8323                                 /*
8324                                  * It must be unsent. Cookies and ASCONF's
8325                                  * hang around but there timers will force
8326                                  * when marked for resend.
8327                                  */
8328                                 continue;
8329                         }
8330                         /*
8331                          * if no AUTH is yet included and this chunk
8332                          * requires it, make sure to account for it.  We
8333                          * don't apply the size until the AUTH chunk is
8334                          * actually added below in case there is no room for
8335                          * this chunk. NOTE: we overload the use of "omtu"
8336                          * here
8337                          */
8338                         if ((auth == NULL) &&
8339                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8340                             stcb->asoc.peer_auth_chunks)) {
8341                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8342                         } else
8343                                 omtu = 0;
8344                         /* Here we do NOT factor the r_mtu */
8345                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8346                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8347                                 /*
8348                                  * We probably should glom the mbuf chain
8349                                  * from the chk->data for control but the
8350                                  * problem is it becomes yet one more level
8351                                  * of tracking to do if for some reason
8352                                  * output fails. Then I have got to
8353                                  * reconstruct the merged control chain.. el
8354                                  * yucko.. for now we take the easy way and
8355                                  * do the copy
8356                                  */
8357                                 /*
8358                                  * Add an AUTH chunk, if chunk requires it
8359                                  * save the offset into the chain for AUTH
8360                                  */
8361                                 if ((auth == NULL) &&
8362                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8363                                     stcb->asoc.peer_auth_chunks))) {
8364                                         outchain = sctp_add_auth_chunk(outchain,
8365                                             &endoutchain,
8366                                             &auth,
8367                                             &auth_offset,
8368                                             stcb,
8369                                             chk->rec.chunk_id.id);
8370                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8371                                 }
8372                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8373                                     (int)chk->rec.chunk_id.can_take_data,
8374                                     chk->send_size, chk->copy_by_ref);
8375                                 if (outchain == NULL) {
8376                                         *reason_code = 8;
8377                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8378                                         return (ENOMEM);
8379                                 }
8380                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8381                                 /* update our MTU size */
8382                                 if (mtu > (chk->send_size + omtu))
8383                                         mtu -= (chk->send_size + omtu);
8384                                 else
8385                                         mtu = 0;
8386                                 to_out += (chk->send_size + omtu);
8387                                 /* Do clear IP_DF ? */
8388                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8389                                         no_fragmentflg = 0;
8390                                 }
8391                                 if (chk->rec.chunk_id.can_take_data)
8392                                         chk->data = NULL;
8393                                 /* Mark things to be removed, if needed */
8394                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8395                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8396                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8397                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8398                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8399                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8400                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8401                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8402                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8403                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8404                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8405                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8406                                                 hbflag = 1;
8407                                         }
8408                                         /* remove these chunks at the end */
8409                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8410                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8411                                                 /* turn off the timer */
8412                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8413                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8414                                                             inp, stcb, net,
8415                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8416                                                 }
8417                                         }
8418                                         ctl_cnt++;
8419                                 } else {
8420                                         /*
8421                                          * Other chunks, since they have
8422                                          * timers running (i.e. COOKIE) we
8423                                          * just "trust" that it gets sent or
8424                                          * retransmitted.
8425                                          */
8426                                         ctl_cnt++;
8427                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8428                                                 cookie = 1;
8429                                                 no_out_cnt = 1;
8430                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8431                                                 /*
8432                                                  * Increment ecne send count
8433                                                  * here this means we may be
8434                                                  * over-zealous in our
8435                                                  * counting if the send
8436                                                  * fails, but its the best
8437                                                  * place to do it (we used
8438                                                  * to do it in the queue of
8439                                                  * the chunk, but that did
8440                                                  * not tell how many times
8441                                                  * it was sent.
8442                                                  */
8443                                                 SCTP_STAT_INCR(sctps_sendecne);
8444                                         }
8445                                         chk->sent = SCTP_DATAGRAM_SENT;
8446                                         if (chk->whoTo == NULL) {
8447                                                 chk->whoTo = net;
8448                                                 atomic_add_int(&net->ref_count, 1);
8449                                         }
8450                                         chk->snd_count++;
8451                                 }
8452                                 if (mtu == 0) {
8453                                         /*
8454                                          * Ok we are out of room but we can
8455                                          * output without effecting the
8456                                          * flight size since this little guy
8457                                          * is a control only packet.
8458                                          */
8459                                         if (asconf) {
8460                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8461                                                 /*
8462                                                  * do NOT clear the asconf
8463                                                  * flag as it is used to do
8464                                                  * appropriate source
8465                                                  * address selection.
8466                                                  */
8467                                         }
8468                                         if (cookie) {
8469                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8470                                                 cookie = 0;
8471                                         }
8472                                         /* Only HB or ASCONF advances time */
8473                                         if (hbflag) {
8474                                                 if (*now_filled == 0) {
8475                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8476                                                         *now_filled = 1;
8477                                                 }
8478                                                 net->last_sent_time = *now;
8479                                                 hbflag = 0;
8480                                         }
8481                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8482                                             (struct sockaddr *)&net->ro._l_addr,
8483                                             outchain,
8484                                             auth_offset, auth,
8485                                             stcb->asoc.authinfo.active_keyid,
8486                                             no_fragmentflg, 0, asconf,
8487                                             inp->sctp_lport, stcb->rport,
8488                                             htonl(stcb->asoc.peer_vtag),
8489                                             net->port, NULL,
8490                                             0, 0,
8491                                             so_locked))) {
8492                                                 /*
8493                                                  * error, we could not
8494                                                  * output
8495                                                  */
8496                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8497                                                 if (from_where == 0) {
8498                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8499                                                 }
8500                                                 if (error == ENOBUFS) {
8501                                                         asoc->ifp_had_enobuf = 1;
8502                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8503                                                 }
8504                                                 if (error == EHOSTUNREACH) {
8505                                                         /*
8506                                                          * Destination went
8507                                                          * unreachable
8508                                                          * during this send
8509                                                          */
8510                                                         sctp_move_chunks_from_net(stcb, net);
8511                                                 }
8512                                                 *reason_code = 7;
8513                                                 break;
8514                                         } else {
8515                                                 asoc->ifp_had_enobuf = 0;
8516                                         }
8517                                         /*
8518                                          * increase the number we sent, if a
8519                                          * cookie is sent we don't tell them
8520                                          * any was sent out.
8521                                          */
8522                                         outchain = endoutchain = NULL;
8523                                         auth = NULL;
8524                                         auth_offset = 0;
8525                                         if (!no_out_cnt)
8526                                                 *num_out += ctl_cnt;
8527                                         /* recalc a clean slate and setup */
8528                                         switch (net->ro._l_addr.sa.sa_family) {
8529 #ifdef INET
8530                                         case AF_INET:
8531                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8532                                                 break;
8533 #endif
8534 #ifdef INET6
8535                                         case AF_INET6:
8536                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8537                                                 break;
8538 #endif
8539                                         default:
8540                                                 /* TSNH */
8541                                                 mtu = net->mtu;
8542                                                 break;
8543                                         }
8544                                         to_out = 0;
8545                                         no_fragmentflg = 1;
8546                                 }
8547                         }
8548                 }
8549                 if (error != 0) {
8550                         /* try next net */
8551                         continue;
8552                 }
8553                 /* JRI: if dest is in PF state, do not send data to it */
8554                 if ((asoc->sctp_cmt_on_off > 0) &&
8555                     (net != stcb->asoc.alternate) &&
8556                     (net->dest_state & SCTP_ADDR_PF)) {
8557                         goto no_data_fill;
8558                 }
8559                 if (net->flight_size >= net->cwnd) {
8560                         goto no_data_fill;
8561                 }
8562                 if ((asoc->sctp_cmt_on_off > 0) &&
8563                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8564                     (net->flight_size > max_rwnd_per_dest)) {
8565                         goto no_data_fill;
8566                 }
8567                 /*
8568                  * We need a specific accounting for the usage of the send
8569                  * buffer. We also need to check the number of messages per
8570                  * net. For now, this is better than nothing and it disabled
8571                  * by default...
8572                  */
8573                 if ((asoc->sctp_cmt_on_off > 0) &&
8574                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8575                     (max_send_per_dest > 0) &&
8576                     (net->flight_size > max_send_per_dest)) {
8577                         goto no_data_fill;
8578                 }
8579                 /*********************/
8580                 /* Data transmission */
8581                 /*********************/
8582                 /*
8583                  * if AUTH for DATA is required and no AUTH has been added
8584                  * yet, account for this in the mtu now... if no data can be
8585                  * bundled, this adjustment won't matter anyways since the
8586                  * packet will be going out...
8587                  */
8588                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8589                     stcb->asoc.peer_auth_chunks);
8590                 if (data_auth_reqd && (auth == NULL)) {
8591                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8592                 }
8593                 /* now lets add any data within the MTU constraints */
8594                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8595 #ifdef INET
8596                 case AF_INET:
8597                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8598                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8599                         else
8600                                 omtu = 0;
8601                         break;
8602 #endif
8603 #ifdef INET6
8604                 case AF_INET6:
8605                         if (net->mtu > SCTP_MIN_OVERHEAD)
8606                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8607                         else
8608                                 omtu = 0;
8609                         break;
8610 #endif
8611                 default:
8612                         /* TSNH */
8613                         omtu = 0;
8614                         break;
8615                 }
8616                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8617                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8618                     (skip_data_for_this_net == 0)) ||
8619                     (cookie)) {
8620                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8621                                 if (no_data_chunks) {
8622                                         /* let only control go out */
8623                                         *reason_code = 1;
8624                                         break;
8625                                 }
8626                                 if (net->flight_size >= net->cwnd) {
8627                                         /* skip this net, no room for data */
8628                                         *reason_code = 2;
8629                                         break;
8630                                 }
8631                                 if ((chk->whoTo != NULL) &&
8632                                     (chk->whoTo != net)) {
8633                                         /* Don't send the chunk on this net */
8634                                         continue;
8635                                 }
8636
8637                                 if (asoc->sctp_cmt_on_off == 0) {
8638                                         if ((asoc->alternate) &&
8639                                             (asoc->alternate != net) &&
8640                                             (chk->whoTo == NULL)) {
8641                                                 continue;
8642                                         } else if ((net != asoc->primary_destination) &&
8643                                                     (asoc->alternate == NULL) &&
8644                                             (chk->whoTo == NULL)) {
8645                                                 continue;
8646                                         }
8647                                 }
8648                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8649                                         /*-
8650                                          * strange, we have a chunk that is
8651                                          * to big for its destination and
8652                                          * yet no fragment ok flag.
8653                                          * Something went wrong when the
8654                                          * PMTU changed...we did not mark
8655                                          * this chunk for some reason?? I
8656                                          * will fix it here by letting IP
8657                                          * fragment it for now and printing
8658                                          * a warning. This really should not
8659                                          * happen ...
8660                                          */
8661                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8662                                             chk->send_size, mtu);
8663                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8664                                 }
8665                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8666                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8667                                         struct sctp_data_chunk *dchkh;
8668
8669                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8670                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8671                                 }
8672                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8673                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8674                                         /* ok we will add this one */
8675
8676                                         /*
8677                                          * Add an AUTH chunk, if chunk
8678                                          * requires it, save the offset into
8679                                          * the chain for AUTH
8680                                          */
8681                                         if (data_auth_reqd) {
8682                                                 if (auth == NULL) {
8683                                                         outchain = sctp_add_auth_chunk(outchain,
8684                                                             &endoutchain,
8685                                                             &auth,
8686                                                             &auth_offset,
8687                                                             stcb,
8688                                                             SCTP_DATA);
8689                                                         auth_keyid = chk->auth_keyid;
8690                                                         override_ok = 0;
8691                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8692                                                 } else if (override_ok) {
8693                                                         /*
8694                                                          * use this data's
8695                                                          * keyid
8696                                                          */
8697                                                         auth_keyid = chk->auth_keyid;
8698                                                         override_ok = 0;
8699                                                 } else if (auth_keyid != chk->auth_keyid) {
8700                                                         /*
8701                                                          * different keyid,
8702                                                          * so done bundling
8703                                                          */
8704                                                         break;
8705                                                 }
8706                                         }
8707                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8708                                             chk->send_size, chk->copy_by_ref);
8709                                         if (outchain == NULL) {
8710                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8711                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8712                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8713                                                 }
8714                                                 *reason_code = 3;
8715                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8716                                                 return (ENOMEM);
8717                                         }
8718                                         /* upate our MTU size */
8719                                         /* Do clear IP_DF ? */
8720                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8721                                                 no_fragmentflg = 0;
8722                                         }
8723                                         /* unsigned subtraction of mtu */
8724                                         if (mtu > chk->send_size)
8725                                                 mtu -= chk->send_size;
8726                                         else
8727                                                 mtu = 0;
8728                                         /* unsigned subtraction of r_mtu */
8729                                         if (r_mtu > chk->send_size)
8730                                                 r_mtu -= chk->send_size;
8731                                         else
8732                                                 r_mtu = 0;
8733
8734                                         to_out += chk->send_size;
8735                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8736 #ifdef INVARIANTS
8737                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8738 #else
8739                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8740                                                     mx_mtu, to_out);
8741 #endif
8742                                         }
8743                                         chk->window_probe = 0;
8744                                         data_list[bundle_at++] = chk;
8745                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8746                                                 break;
8747                                         }
8748                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8749                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8750                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8751                                                 } else {
8752                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8753                                                 }
8754                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8755                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8756                                                         /*
8757                                                          * Count number of
8758                                                          * user msg's that
8759                                                          * were fragmented
8760                                                          * we do this by
8761                                                          * counting when we
8762                                                          * see a LAST
8763                                                          * fragment only.
8764                                                          */
8765                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8766                                         }
8767                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8768                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8769                                                         data_list[0]->window_probe = 1;
8770                                                         net->window_probe = 1;
8771                                                 }
8772                                                 break;
8773                                         }
8774                                 } else {
8775                                         /*
8776                                          * Must be sent in order of the
8777                                          * TSN's (on a network)
8778                                          */
8779                                         break;
8780                                 }
8781                         }       /* for (chunk gather loop for this net) */
8782                 }               /* if asoc.state OPEN */
8783 no_data_fill:
8784                 /* Is there something to send for this destination? */
8785                 if (outchain) {
8786                         /* We may need to start a control timer or two */
8787                         if (asconf) {
8788                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8789                                     stcb, net);
8790                                 /*
8791                                  * do NOT clear the asconf flag as it is
8792                                  * used to do appropriate source address
8793                                  * selection.
8794                                  */
8795                         }
8796                         if (cookie) {
8797                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8798                                 cookie = 0;
8799                         }
8800                         /* must start a send timer if data is being sent */
8801                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8802                                 /*
8803                                  * no timer running on this destination
8804                                  * restart it.
8805                                  */
8806                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8807                         }
8808                         if (bundle_at || hbflag) {
8809                                 /* For data/asconf and hb set time */
8810                                 if (*now_filled == 0) {
8811                                         (void)SCTP_GETTIME_TIMEVAL(now);
8812                                         *now_filled = 1;
8813                                 }
8814                                 net->last_sent_time = *now;
8815                         }
8816                         /* Now send it, if there is anything to send :> */
8817                         if ((error = sctp_lowlevel_chunk_output(inp,
8818                             stcb,
8819                             net,
8820                             (struct sockaddr *)&net->ro._l_addr,
8821                             outchain,
8822                             auth_offset,
8823                             auth,
8824                             auth_keyid,
8825                             no_fragmentflg,
8826                             bundle_at,
8827                             asconf,
8828                             inp->sctp_lport, stcb->rport,
8829                             htonl(stcb->asoc.peer_vtag),
8830                             net->port, NULL,
8831                             0, 0,
8832                             so_locked))) {
8833                                 /* error, we could not output */
8834                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8835                                 if (from_where == 0) {
8836                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8837                                 }
8838                                 if (error == ENOBUFS) {
8839                                         asoc->ifp_had_enobuf = 1;
8840                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8841                                 }
8842                                 if (error == EHOSTUNREACH) {
8843                                         /*
8844                                          * Destination went unreachable
8845                                          * during this send
8846                                          */
8847                                         sctp_move_chunks_from_net(stcb, net);
8848                                 }
8849                                 *reason_code = 6;
8850                                 /*-
8851                                  * I add this line to be paranoid. As far as
8852                                  * I can tell the continue, takes us back to
8853                                  * the top of the for, but just to make sure
8854                                  * I will reset these again here.
8855                                  */
8856                                 ctl_cnt = bundle_at = 0;
8857                                 continue;       /* This takes us back to the
8858                                                  * for() for the nets. */
8859                         } else {
8860                                 asoc->ifp_had_enobuf = 0;
8861                         }
8862                         endoutchain = NULL;
8863                         auth = NULL;
8864                         auth_offset = 0;
8865                         if (!no_out_cnt) {
8866                                 *num_out += (ctl_cnt + bundle_at);
8867                         }
8868                         if (bundle_at) {
8869                                 /* setup for a RTO measurement */
8870                                 tsns_sent = data_list[0]->rec.data.tsn;
8871                                 /* fill time if not already filled */
8872                                 if (*now_filled == 0) {
8873                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8874                                         *now_filled = 1;
8875                                         *now = asoc->time_last_sent;
8876                                 } else {
8877                                         asoc->time_last_sent = *now;
8878                                 }
8879                                 if (net->rto_needed) {
8880                                         data_list[0]->do_rtt = 1;
8881                                         net->rto_needed = 0;
8882                                 }
8883                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8884                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8885                         }
8886                         if (one_chunk) {
8887                                 break;
8888                         }
8889                 }
8890                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8891                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8892                 }
8893         }
8894         if (old_start_at == NULL) {
8895                 old_start_at = start_at;
8896                 start_at = TAILQ_FIRST(&asoc->nets);
8897                 if (old_start_at)
8898                         goto again_one_more_time;
8899         }
8900
8901         /*
8902          * At the end there should be no NON timed chunks hanging on this
8903          * queue.
8904          */
8905         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8906                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8907         }
8908         if ((*num_out == 0) && (*reason_code == 0)) {
8909                 *reason_code = 4;
8910         } else {
8911                 *reason_code = 5;
8912         }
8913         sctp_clean_up_ctl(stcb, asoc, so_locked);
8914         return (0);
8915 }
8916
8917 void
8918 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8919 {
8920         /*-
8921          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8922          * the control chunk queue.
8923          */
8924         struct sctp_chunkhdr *hdr;
8925         struct sctp_tmit_chunk *chk;
8926         struct mbuf *mat, *last_mbuf;
8927         uint32_t chunk_length;
8928         uint16_t padding_length;
8929
8930         SCTP_TCB_LOCK_ASSERT(stcb);
8931         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8932         if (op_err == NULL) {
8933                 return;
8934         }
8935         last_mbuf = NULL;
8936         chunk_length = 0;
8937         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8938                 chunk_length += SCTP_BUF_LEN(mat);
8939                 if (SCTP_BUF_NEXT(mat) == NULL) {
8940                         last_mbuf = mat;
8941                 }
8942         }
8943         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8944                 sctp_m_freem(op_err);
8945                 return;
8946         }
8947         padding_length = chunk_length % 4;
8948         if (padding_length != 0) {
8949                 padding_length = 4 - padding_length;
8950         }
8951         if (padding_length != 0) {
8952                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8953                         sctp_m_freem(op_err);
8954                         return;
8955                 }
8956         }
8957         sctp_alloc_a_chunk(stcb, chk);
8958         if (chk == NULL) {
8959                 /* no memory */
8960                 sctp_m_freem(op_err);
8961                 return;
8962         }
8963         chk->copy_by_ref = 0;
8964         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8965         chk->rec.chunk_id.can_take_data = 0;
8966         chk->flags = 0;
8967         chk->send_size = (uint16_t)chunk_length;
8968         chk->sent = SCTP_DATAGRAM_UNSENT;
8969         chk->snd_count = 0;
8970         chk->asoc = &stcb->asoc;
8971         chk->data = op_err;
8972         chk->whoTo = NULL;
8973         hdr = mtod(op_err, struct sctp_chunkhdr *);
8974         hdr->chunk_type = SCTP_OPERATION_ERROR;
8975         hdr->chunk_flags = 0;
8976         hdr->chunk_length = htons(chk->send_size);
8977         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8978         chk->asoc->ctrl_queue_cnt++;
8979 }
8980
8981 int
8982 sctp_send_cookie_echo(struct mbuf *m,
8983     int offset,
8984     struct sctp_tcb *stcb,
8985     struct sctp_nets *net)
8986 {
8987         /*-
8988          * pull out the cookie and put it at the front of the control chunk
8989          * queue.
8990          */
8991         int at;
8992         struct mbuf *cookie;
8993         struct sctp_paramhdr param, *phdr;
8994         struct sctp_chunkhdr *hdr;
8995         struct sctp_tmit_chunk *chk;
8996         uint16_t ptype, plen;
8997
8998         SCTP_TCB_LOCK_ASSERT(stcb);
8999         /* First find the cookie in the param area */
9000         cookie = NULL;
9001         at = offset + sizeof(struct sctp_init_chunk);
9002         for (;;) {
9003                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9004                 if (phdr == NULL) {
9005                         return (-3);
9006                 }
9007                 ptype = ntohs(phdr->param_type);
9008                 plen = ntohs(phdr->param_length);
9009                 if (ptype == SCTP_STATE_COOKIE) {
9010                         int pad;
9011
9012                         /* found the cookie */
9013                         if ((pad = (plen % 4))) {
9014                                 plen += 4 - pad;
9015                         }
9016                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9017                         if (cookie == NULL) {
9018                                 /* No memory */
9019                                 return (-2);
9020                         }
9021 #ifdef SCTP_MBUF_LOGGING
9022                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9023                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9024                         }
9025 #endif
9026                         break;
9027                 }
9028                 at += SCTP_SIZE32(plen);
9029         }
9030         /* ok, we got the cookie lets change it into a cookie echo chunk */
9031         /* first the change from param to cookie */
9032         hdr = mtod(cookie, struct sctp_chunkhdr *);
9033         hdr->chunk_type = SCTP_COOKIE_ECHO;
9034         hdr->chunk_flags = 0;
9035         /* get the chunk stuff now and place it in the FRONT of the queue */
9036         sctp_alloc_a_chunk(stcb, chk);
9037         if (chk == NULL) {
9038                 /* no memory */
9039                 sctp_m_freem(cookie);
9040                 return (-5);
9041         }
9042         chk->copy_by_ref = 0;
9043         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9044         chk->rec.chunk_id.can_take_data = 0;
9045         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9046         chk->send_size = plen;
9047         chk->sent = SCTP_DATAGRAM_UNSENT;
9048         chk->snd_count = 0;
9049         chk->asoc = &stcb->asoc;
9050         chk->data = cookie;
9051         chk->whoTo = net;
9052         atomic_add_int(&chk->whoTo->ref_count, 1);
9053         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9054         chk->asoc->ctrl_queue_cnt++;
9055         return (0);
9056 }
9057
9058 void
9059 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9060     struct mbuf *m,
9061     int offset,
9062     int chk_length,
9063     struct sctp_nets *net)
9064 {
9065         /*
9066          * take a HB request and make it into a HB ack and send it.
9067          */
9068         struct mbuf *outchain;
9069         struct sctp_chunkhdr *chdr;
9070         struct sctp_tmit_chunk *chk;
9071
9072         if (net == NULL)
9073                 /* must have a net pointer */
9074                 return;
9075
9076         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9077         if (outchain == NULL) {
9078                 /* gak out of memory */
9079                 return;
9080         }
9081 #ifdef SCTP_MBUF_LOGGING
9082         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9083                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9084         }
9085 #endif
9086         chdr = mtod(outchain, struct sctp_chunkhdr *);
9087         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9088         chdr->chunk_flags = 0;
9089         if (chk_length % 4 != 0) {
9090                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9091         }
9092         sctp_alloc_a_chunk(stcb, chk);
9093         if (chk == NULL) {
9094                 /* no memory */
9095                 sctp_m_freem(outchain);
9096                 return;
9097         }
9098         chk->copy_by_ref = 0;
9099         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9100         chk->rec.chunk_id.can_take_data = 1;
9101         chk->flags = 0;
9102         chk->send_size = chk_length;
9103         chk->sent = SCTP_DATAGRAM_UNSENT;
9104         chk->snd_count = 0;
9105         chk->asoc = &stcb->asoc;
9106         chk->data = outchain;
9107         chk->whoTo = net;
9108         atomic_add_int(&chk->whoTo->ref_count, 1);
9109         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9110         chk->asoc->ctrl_queue_cnt++;
9111 }
9112
9113 void
9114 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9115 {
9116         /* formulate and queue a cookie-ack back to sender */
9117         struct mbuf *cookie_ack;
9118         struct sctp_chunkhdr *hdr;
9119         struct sctp_tmit_chunk *chk;
9120
9121         SCTP_TCB_LOCK_ASSERT(stcb);
9122
9123         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9124         if (cookie_ack == NULL) {
9125                 /* no mbuf's */
9126                 return;
9127         }
9128         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9129         sctp_alloc_a_chunk(stcb, chk);
9130         if (chk == NULL) {
9131                 /* no memory */
9132                 sctp_m_freem(cookie_ack);
9133                 return;
9134         }
9135         chk->copy_by_ref = 0;
9136         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9137         chk->rec.chunk_id.can_take_data = 1;
9138         chk->flags = 0;
9139         chk->send_size = sizeof(struct sctp_chunkhdr);
9140         chk->sent = SCTP_DATAGRAM_UNSENT;
9141         chk->snd_count = 0;
9142         chk->asoc = &stcb->asoc;
9143         chk->data = cookie_ack;
9144         if (chk->asoc->last_control_chunk_from != NULL) {
9145                 chk->whoTo = chk->asoc->last_control_chunk_from;
9146                 atomic_add_int(&chk->whoTo->ref_count, 1);
9147         } else {
9148                 chk->whoTo = NULL;
9149         }
9150         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9151         hdr->chunk_type = SCTP_COOKIE_ACK;
9152         hdr->chunk_flags = 0;
9153         hdr->chunk_length = htons(chk->send_size);
9154         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9155         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9156         chk->asoc->ctrl_queue_cnt++;
9157         return;
9158 }
9159
9160
9161 void
9162 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9163 {
9164         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9165         struct mbuf *m_shutdown_ack;
9166         struct sctp_shutdown_ack_chunk *ack_cp;
9167         struct sctp_tmit_chunk *chk;
9168
9169         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9170         if (m_shutdown_ack == NULL) {
9171                 /* no mbuf's */
9172                 return;
9173         }
9174         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9175         sctp_alloc_a_chunk(stcb, chk);
9176         if (chk == NULL) {
9177                 /* no memory */
9178                 sctp_m_freem(m_shutdown_ack);
9179                 return;
9180         }
9181         chk->copy_by_ref = 0;
9182         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9183         chk->rec.chunk_id.can_take_data = 1;
9184         chk->flags = 0;
9185         chk->send_size = sizeof(struct sctp_chunkhdr);
9186         chk->sent = SCTP_DATAGRAM_UNSENT;
9187         chk->snd_count = 0;
9188         chk->asoc = &stcb->asoc;
9189         chk->data = m_shutdown_ack;
9190         chk->whoTo = net;
9191         if (chk->whoTo) {
9192                 atomic_add_int(&chk->whoTo->ref_count, 1);
9193         }
9194         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9195         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9196         ack_cp->ch.chunk_flags = 0;
9197         ack_cp->ch.chunk_length = htons(chk->send_size);
9198         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9199         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9200         chk->asoc->ctrl_queue_cnt++;
9201         return;
9202 }
9203
9204 void
9205 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9206 {
9207         /* formulate and queue a SHUTDOWN to the sender */
9208         struct mbuf *m_shutdown;
9209         struct sctp_shutdown_chunk *shutdown_cp;
9210         struct sctp_tmit_chunk *chk;
9211
9212         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9213                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9214                         /* We already have a SHUTDOWN queued. Reuse it. */
9215                         if (chk->whoTo) {
9216                                 sctp_free_remote_addr(chk->whoTo);
9217                                 chk->whoTo = NULL;
9218                         }
9219                         break;
9220                 }
9221         }
9222         if (chk == NULL) {
9223                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9224                 if (m_shutdown == NULL) {
9225                         /* no mbuf's */
9226                         return;
9227                 }
9228                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9229                 sctp_alloc_a_chunk(stcb, chk);
9230                 if (chk == NULL) {
9231                         /* no memory */
9232                         sctp_m_freem(m_shutdown);
9233                         return;
9234                 }
9235                 chk->copy_by_ref = 0;
9236                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9237                 chk->rec.chunk_id.can_take_data = 1;
9238                 chk->flags = 0;
9239                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9240                 chk->sent = SCTP_DATAGRAM_UNSENT;
9241                 chk->snd_count = 0;
9242                 chk->asoc = &stcb->asoc;
9243                 chk->data = m_shutdown;
9244                 chk->whoTo = net;
9245                 if (chk->whoTo) {
9246                         atomic_add_int(&chk->whoTo->ref_count, 1);
9247                 }
9248                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9249                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9250                 shutdown_cp->ch.chunk_flags = 0;
9251                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9252                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9253                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9254                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9255                 chk->asoc->ctrl_queue_cnt++;
9256         } else {
9257                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9258                 chk->whoTo = net;
9259                 if (chk->whoTo) {
9260                         atomic_add_int(&chk->whoTo->ref_count, 1);
9261                 }
9262                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9263                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9264                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9265         }
9266         return;
9267 }
9268
9269 void
9270 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9271 {
9272         /*
9273          * formulate and queue an ASCONF to the peer. ASCONF parameters
9274          * should be queued on the assoc queue.
9275          */
9276         struct sctp_tmit_chunk *chk;
9277         struct mbuf *m_asconf;
9278         int len;
9279
9280         SCTP_TCB_LOCK_ASSERT(stcb);
9281
9282         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9283             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9284                 /* can't send a new one if there is one in flight already */
9285                 return;
9286         }
9287
9288         /* compose an ASCONF chunk, maximum length is PMTU */
9289         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9290         if (m_asconf == NULL) {
9291                 return;
9292         }
9293
9294         sctp_alloc_a_chunk(stcb, chk);
9295         if (chk == NULL) {
9296                 /* no memory */
9297                 sctp_m_freem(m_asconf);
9298                 return;
9299         }
9300
9301         chk->copy_by_ref = 0;
9302         chk->rec.chunk_id.id = SCTP_ASCONF;
9303         chk->rec.chunk_id.can_take_data = 0;
9304         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9305         chk->data = m_asconf;
9306         chk->send_size = len;
9307         chk->sent = SCTP_DATAGRAM_UNSENT;
9308         chk->snd_count = 0;
9309         chk->asoc = &stcb->asoc;
9310         chk->whoTo = net;
9311         if (chk->whoTo) {
9312                 atomic_add_int(&chk->whoTo->ref_count, 1);
9313         }
9314         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9315         chk->asoc->ctrl_queue_cnt++;
9316         return;
9317 }
9318
9319 void
9320 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9321 {
9322         /*
9323          * formulate and queue a asconf-ack back to sender. the asconf-ack
9324          * must be stored in the tcb.
9325          */
9326         struct sctp_tmit_chunk *chk;
9327         struct sctp_asconf_ack *ack, *latest_ack;
9328         struct mbuf *m_ack;
9329         struct sctp_nets *net = NULL;
9330
9331         SCTP_TCB_LOCK_ASSERT(stcb);
9332         /* Get the latest ASCONF-ACK */
9333         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9334         if (latest_ack == NULL) {
9335                 return;
9336         }
9337         if (latest_ack->last_sent_to != NULL &&
9338             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9339                 /* we're doing a retransmission */
9340                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9341                 if (net == NULL) {
9342                         /* no alternate */
9343                         if (stcb->asoc.last_control_chunk_from == NULL) {
9344                                 if (stcb->asoc.alternate) {
9345                                         net = stcb->asoc.alternate;
9346                                 } else {
9347                                         net = stcb->asoc.primary_destination;
9348                                 }
9349                         } else {
9350                                 net = stcb->asoc.last_control_chunk_from;
9351                         }
9352                 }
9353         } else {
9354                 /* normal case */
9355                 if (stcb->asoc.last_control_chunk_from == NULL) {
9356                         if (stcb->asoc.alternate) {
9357                                 net = stcb->asoc.alternate;
9358                         } else {
9359                                 net = stcb->asoc.primary_destination;
9360                         }
9361                 } else {
9362                         net = stcb->asoc.last_control_chunk_from;
9363                 }
9364         }
9365         latest_ack->last_sent_to = net;
9366
9367         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9368                 if (ack->data == NULL) {
9369                         continue;
9370                 }
9371
9372                 /* copy the asconf_ack */
9373                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9374                 if (m_ack == NULL) {
9375                         /* couldn't copy it */
9376                         return;
9377                 }
9378 #ifdef SCTP_MBUF_LOGGING
9379                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9380                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9381                 }
9382 #endif
9383
9384                 sctp_alloc_a_chunk(stcb, chk);
9385                 if (chk == NULL) {
9386                         /* no memory */
9387                         if (m_ack)
9388                                 sctp_m_freem(m_ack);
9389                         return;
9390                 }
9391                 chk->copy_by_ref = 0;
9392                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9393                 chk->rec.chunk_id.can_take_data = 1;
9394                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9395                 chk->whoTo = net;
9396                 if (chk->whoTo) {
9397                         atomic_add_int(&chk->whoTo->ref_count, 1);
9398                 }
9399                 chk->data = m_ack;
9400                 chk->send_size = ack->len;
9401                 chk->sent = SCTP_DATAGRAM_UNSENT;
9402                 chk->snd_count = 0;
9403                 chk->asoc = &stcb->asoc;
9404
9405                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9406                 chk->asoc->ctrl_queue_cnt++;
9407         }
9408         return;
9409 }
9410
9411
9412 static int
9413 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9414     struct sctp_tcb *stcb,
9415     struct sctp_association *asoc,
9416     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9417 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9418     SCTP_UNUSED
9419 #endif
9420 )
9421 {
9422         /*-
9423          * send out one MTU of retransmission. If fast_retransmit is
9424          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9425          * rwnd. For a Cookie or Asconf in the control chunk queue we
9426          * retransmit them by themselves.
9427          *
9428          * For data chunks we will pick out the lowest TSN's in the sent_queue
9429          * marked for resend and bundle them all together (up to a MTU of
9430          * destination). The address to send to should have been
9431          * selected/changed where the retransmission was marked (i.e. in FR
9432          * or t3-timeout routines).
9433          */
9434         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9435         struct sctp_tmit_chunk *chk, *fwd;
9436         struct mbuf *m, *endofchain;
9437         struct sctp_nets *net = NULL;
9438         uint32_t tsns_sent = 0;
9439         int no_fragmentflg, bundle_at, cnt_thru;
9440         unsigned int mtu;
9441         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9442         struct sctp_auth_chunk *auth = NULL;
9443         uint32_t auth_offset = 0;
9444         uint16_t auth_keyid;
9445         int override_ok = 1;
9446         int data_auth_reqd = 0;
9447         uint32_t dmtu = 0;
9448
9449         SCTP_TCB_LOCK_ASSERT(stcb);
9450         tmr_started = ctl_cnt = bundle_at = error = 0;
9451         no_fragmentflg = 1;
9452         fwd_tsn = 0;
9453         *cnt_out = 0;
9454         fwd = NULL;
9455         endofchain = m = NULL;
9456         auth_keyid = stcb->asoc.authinfo.active_keyid;
9457 #ifdef SCTP_AUDITING_ENABLED
9458         sctp_audit_log(0xC3, 1);
9459 #endif
9460         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9461             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9462                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9463                     asoc->sent_queue_retran_cnt);
9464                 asoc->sent_queue_cnt = 0;
9465                 asoc->sent_queue_cnt_removeable = 0;
9466                 /* send back 0/0 so we enter normal transmission */
9467                 *cnt_out = 0;
9468                 return (0);
9469         }
9470         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9471                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9472                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9473                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9474                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9475                                 continue;
9476                         }
9477                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9478                                 if (chk != asoc->str_reset) {
9479                                         /*
9480                                          * not eligible for retran if its
9481                                          * not ours
9482                                          */
9483                                         continue;
9484                                 }
9485                         }
9486                         ctl_cnt++;
9487                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9488                                 fwd_tsn = 1;
9489                         }
9490                         /*
9491                          * Add an AUTH chunk, if chunk requires it save the
9492                          * offset into the chain for AUTH
9493                          */
9494                         if ((auth == NULL) &&
9495                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9496                             stcb->asoc.peer_auth_chunks))) {
9497                                 m = sctp_add_auth_chunk(m, &endofchain,
9498                                     &auth, &auth_offset,
9499                                     stcb,
9500                                     chk->rec.chunk_id.id);
9501                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9502                         }
9503                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9504                         break;
9505                 }
9506         }
9507         one_chunk = 0;
9508         cnt_thru = 0;
9509         /* do we have control chunks to retransmit? */
9510         if (m != NULL) {
9511                 /* Start a timer no matter if we succeed or fail */
9512                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9513                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9514                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9515                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9516                 chk->snd_count++;       /* update our count */
9517                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9518                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9519                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9520                     no_fragmentflg, 0, 0,
9521                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9522                     chk->whoTo->port, NULL,
9523                     0, 0,
9524                     so_locked))) {
9525                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9526                         if (error == ENOBUFS) {
9527                                 asoc->ifp_had_enobuf = 1;
9528                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9529                         }
9530                         return (error);
9531                 } else {
9532                         asoc->ifp_had_enobuf = 0;
9533                 }
9534                 endofchain = NULL;
9535                 auth = NULL;
9536                 auth_offset = 0;
9537                 /*
9538                  * We don't want to mark the net->sent time here since this
9539                  * we use this for HB and retrans cannot measure RTT
9540                  */
9541                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9542                 *cnt_out += 1;
9543                 chk->sent = SCTP_DATAGRAM_SENT;
9544                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9545                 if (fwd_tsn == 0) {
9546                         return (0);
9547                 } else {
9548                         /* Clean up the fwd-tsn list */
9549                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9550                         return (0);
9551                 }
9552         }
9553         /*
9554          * Ok, it is just data retransmission we need to do or that and a
9555          * fwd-tsn with it all.
9556          */
9557         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9558                 return (SCTP_RETRAN_DONE);
9559         }
9560         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9561             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9562                 /* not yet open, resend the cookie and that is it */
9563                 return (1);
9564         }
9565 #ifdef SCTP_AUDITING_ENABLED
9566         sctp_auditing(20, inp, stcb, NULL);
9567 #endif
9568         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9569         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9570                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9571                         /* No, not sent to this net or not ready for rtx */
9572                         continue;
9573                 }
9574                 if (chk->data == NULL) {
9575                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9576                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9577                         continue;
9578                 }
9579                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9580                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9581                         struct mbuf *op_err;
9582                         char msg[SCTP_DIAG_INFO_LEN];
9583
9584                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9585                             chk->rec.data.tsn, chk->snd_count);
9586                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9587                             msg);
9588                         atomic_add_int(&stcb->asoc.refcnt, 1);
9589                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9590                             so_locked);
9591                         SCTP_TCB_LOCK(stcb);
9592                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9593                         return (SCTP_RETRAN_EXIT);
9594                 }
9595                 /* pick up the net */
9596                 net = chk->whoTo;
9597                 switch (net->ro._l_addr.sa.sa_family) {
9598 #ifdef INET
9599                 case AF_INET:
9600                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9601                         break;
9602 #endif
9603 #ifdef INET6
9604                 case AF_INET6:
9605                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9606                         break;
9607 #endif
9608                 default:
9609                         /* TSNH */
9610                         mtu = net->mtu;
9611                         break;
9612                 }
9613
9614                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9615                         /* No room in peers rwnd */
9616                         uint32_t tsn;
9617
9618                         tsn = asoc->last_acked_seq + 1;
9619                         if (tsn == chk->rec.data.tsn) {
9620                                 /*
9621                                  * we make a special exception for this
9622                                  * case. The peer has no rwnd but is missing
9623                                  * the lowest chunk.. which is probably what
9624                                  * is holding up the rwnd.
9625                                  */
9626                                 goto one_chunk_around;
9627                         }
9628                         return (1);
9629                 }
9630 one_chunk_around:
9631                 if (asoc->peers_rwnd < mtu) {
9632                         one_chunk = 1;
9633                         if ((asoc->peers_rwnd == 0) &&
9634                             (asoc->total_flight == 0)) {
9635                                 chk->window_probe = 1;
9636                                 chk->whoTo->window_probe = 1;
9637                         }
9638                 }
9639 #ifdef SCTP_AUDITING_ENABLED
9640                 sctp_audit_log(0xC3, 2);
9641 #endif
9642                 bundle_at = 0;
9643                 m = NULL;
9644                 net->fast_retran_ip = 0;
9645                 if (chk->rec.data.doing_fast_retransmit == 0) {
9646                         /*
9647                          * if no FR in progress skip destination that have
9648                          * flight_size > cwnd.
9649                          */
9650                         if (net->flight_size >= net->cwnd) {
9651                                 continue;
9652                         }
9653                 } else {
9654                         /*
9655                          * Mark the destination net to have FR recovery
9656                          * limits put on it.
9657                          */
9658                         *fr_done = 1;
9659                         net->fast_retran_ip = 1;
9660                 }
9661
9662                 /*
9663                  * if no AUTH is yet included and this chunk requires it,
9664                  * make sure to account for it.  We don't apply the size
9665                  * until the AUTH chunk is actually added below in case
9666                  * there is no room for this chunk.
9667                  */
9668                 if (data_auth_reqd && (auth == NULL)) {
9669                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9670                 } else
9671                         dmtu = 0;
9672
9673                 if ((chk->send_size <= (mtu - dmtu)) ||
9674                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9675                         /* ok we will add this one */
9676                         if (data_auth_reqd) {
9677                                 if (auth == NULL) {
9678                                         m = sctp_add_auth_chunk(m,
9679                                             &endofchain,
9680                                             &auth,
9681                                             &auth_offset,
9682                                             stcb,
9683                                             SCTP_DATA);
9684                                         auth_keyid = chk->auth_keyid;
9685                                         override_ok = 0;
9686                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9687                                 } else if (override_ok) {
9688                                         auth_keyid = chk->auth_keyid;
9689                                         override_ok = 0;
9690                                 } else if (chk->auth_keyid != auth_keyid) {
9691                                         /* different keyid, so done bundling */
9692                                         break;
9693                                 }
9694                         }
9695                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9696                         if (m == NULL) {
9697                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9698                                 return (ENOMEM);
9699                         }
9700                         /* Do clear IP_DF ? */
9701                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9702                                 no_fragmentflg = 0;
9703                         }
9704                         /* upate our MTU size */
9705                         if (mtu > (chk->send_size + dmtu))
9706                                 mtu -= (chk->send_size + dmtu);
9707                         else
9708                                 mtu = 0;
9709                         data_list[bundle_at++] = chk;
9710                         if (one_chunk && (asoc->total_flight <= 0)) {
9711                                 SCTP_STAT_INCR(sctps_windowprobed);
9712                         }
9713                 }
9714                 if (one_chunk == 0) {
9715                         /*
9716                          * now are there anymore forward from chk to pick
9717                          * up?
9718                          */
9719                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9720                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9721                                         /* Nope, not for retran */
9722                                         continue;
9723                                 }
9724                                 if (fwd->whoTo != net) {
9725                                         /* Nope, not the net in question */
9726                                         continue;
9727                                 }
9728                                 if (data_auth_reqd && (auth == NULL)) {
9729                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9730                                 } else
9731                                         dmtu = 0;
9732                                 if (fwd->send_size <= (mtu - dmtu)) {
9733                                         if (data_auth_reqd) {
9734                                                 if (auth == NULL) {
9735                                                         m = sctp_add_auth_chunk(m,
9736                                                             &endofchain,
9737                                                             &auth,
9738                                                             &auth_offset,
9739                                                             stcb,
9740                                                             SCTP_DATA);
9741                                                         auth_keyid = fwd->auth_keyid;
9742                                                         override_ok = 0;
9743                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9744                                                 } else if (override_ok) {
9745                                                         auth_keyid = fwd->auth_keyid;
9746                                                         override_ok = 0;
9747                                                 } else if (fwd->auth_keyid != auth_keyid) {
9748                                                         /*
9749                                                          * different keyid,
9750                                                          * so done bundling
9751                                                          */
9752                                                         break;
9753                                                 }
9754                                         }
9755                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9756                                         if (m == NULL) {
9757                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9758                                                 return (ENOMEM);
9759                                         }
9760                                         /* Do clear IP_DF ? */
9761                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9762                                                 no_fragmentflg = 0;
9763                                         }
9764                                         /* upate our MTU size */
9765                                         if (mtu > (fwd->send_size + dmtu))
9766                                                 mtu -= (fwd->send_size + dmtu);
9767                                         else
9768                                                 mtu = 0;
9769                                         data_list[bundle_at++] = fwd;
9770                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9771                                                 break;
9772                                         }
9773                                 } else {
9774                                         /* can't fit so we are done */
9775                                         break;
9776                                 }
9777                         }
9778                 }
9779                 /* Is there something to send for this destination? */
9780                 if (m) {
9781                         /*
9782                          * No matter if we fail/or succeed we should start a
9783                          * timer. A failure is like a lost IP packet :-)
9784                          */
9785                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9786                                 /*
9787                                  * no timer running on this destination
9788                                  * restart it.
9789                                  */
9790                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9791                                 tmr_started = 1;
9792                         }
9793                         /* Now lets send it, if there is anything to send :> */
9794                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9795                             (struct sockaddr *)&net->ro._l_addr, m,
9796                             auth_offset, auth, auth_keyid,
9797                             no_fragmentflg, 0, 0,
9798                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9799                             net->port, NULL,
9800                             0, 0,
9801                             so_locked))) {
9802                                 /* error, we could not output */
9803                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9804                                 if (error == ENOBUFS) {
9805                                         asoc->ifp_had_enobuf = 1;
9806                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9807                                 }
9808                                 return (error);
9809                         } else {
9810                                 asoc->ifp_had_enobuf = 0;
9811                         }
9812                         endofchain = NULL;
9813                         auth = NULL;
9814                         auth_offset = 0;
9815                         /* For HB's */
9816                         /*
9817                          * We don't want to mark the net->sent time here
9818                          * since this we use this for HB and retrans cannot
9819                          * measure RTT
9820                          */
9821                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9822
9823                         /* For auto-close */
9824                         cnt_thru++;
9825                         if (*now_filled == 0) {
9826                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9827                                 *now = asoc->time_last_sent;
9828                                 *now_filled = 1;
9829                         } else {
9830                                 asoc->time_last_sent = *now;
9831                         }
9832                         *cnt_out += bundle_at;
9833 #ifdef SCTP_AUDITING_ENABLED
9834                         sctp_audit_log(0xC4, bundle_at);
9835 #endif
9836                         if (bundle_at) {
9837                                 tsns_sent = data_list[0]->rec.data.tsn;
9838                         }
9839                         for (i = 0; i < bundle_at; i++) {
9840                                 SCTP_STAT_INCR(sctps_sendretransdata);
9841                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9842                                 /*
9843                                  * When we have a revoked data, and we
9844                                  * retransmit it, then we clear the revoked
9845                                  * flag since this flag dictates if we
9846                                  * subtracted from the fs
9847                                  */
9848                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9849                                         /* Deflate the cwnd */
9850                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9851                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9852                                 }
9853                                 data_list[i]->snd_count++;
9854                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9855                                 /* record the time */
9856                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9857                                 if (data_list[i]->book_size_scale) {
9858                                         /*
9859                                          * need to double the book size on
9860                                          * this one
9861                                          */
9862                                         data_list[i]->book_size_scale = 0;
9863                                         /*
9864                                          * Since we double the booksize, we
9865                                          * must also double the output queue
9866                                          * size, since this get shrunk when
9867                                          * we free by this amount.
9868                                          */
9869                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9870                                         data_list[i]->book_size *= 2;
9871
9872
9873                                 } else {
9874                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9875                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9876                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9877                                         }
9878                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9879                                             (uint32_t)(data_list[i]->send_size +
9880                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9881                                 }
9882                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9883                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9884                                             data_list[i]->whoTo->flight_size,
9885                                             data_list[i]->book_size,
9886                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9887                                             data_list[i]->rec.data.tsn);
9888                                 }
9889                                 sctp_flight_size_increase(data_list[i]);
9890                                 sctp_total_flight_increase(stcb, data_list[i]);
9891                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9892                                         /* SWS sender side engages */
9893                                         asoc->peers_rwnd = 0;
9894                                 }
9895                                 if ((i == 0) &&
9896                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9897                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9898                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9899                                             (tmr_started == 0)) {
9900                                                 /*-
9901                                                  * ok we just fast-retrans'd
9902                                                  * the lowest TSN, i.e the
9903                                                  * first on the list. In
9904                                                  * this case we want to give
9905                                                  * some more time to get a
9906                                                  * SACK back without a
9907                                                  * t3-expiring.
9908                                                  */
9909                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9910                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9911                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9912                                         }
9913                                 }
9914                         }
9915                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9916                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9917                         }
9918 #ifdef SCTP_AUDITING_ENABLED
9919                         sctp_auditing(21, inp, stcb, NULL);
9920 #endif
9921                 } else {
9922                         /* None will fit */
9923                         return (1);
9924                 }
9925                 if (asoc->sent_queue_retran_cnt <= 0) {
9926                         /* all done we have no more to retran */
9927                         asoc->sent_queue_retran_cnt = 0;
9928                         break;
9929                 }
9930                 if (one_chunk) {
9931                         /* No more room in rwnd */
9932                         return (1);
9933                 }
9934                 /* stop the for loop here. we sent out a packet */
9935                 break;
9936         }
9937         return (0);
9938 }
9939
9940 static void
9941 sctp_timer_validation(struct sctp_inpcb *inp,
9942     struct sctp_tcb *stcb,
9943     struct sctp_association *asoc)
9944 {
9945         struct sctp_nets *net;
9946
9947         /* Validate that a timer is running somewhere */
9948         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9949                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9950                         /* Here is a timer */
9951                         return;
9952                 }
9953         }
9954         SCTP_TCB_LOCK_ASSERT(stcb);
9955         /* Gak, we did not have a timer somewhere */
9956         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9957         if (asoc->alternate) {
9958                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9959         } else {
9960                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9961         }
9962         return;
9963 }
9964
9965 void
9966 sctp_chunk_output(struct sctp_inpcb *inp,
9967     struct sctp_tcb *stcb,
9968     int from_where,
9969     int so_locked
9970 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9971     SCTP_UNUSED
9972 #endif
9973 )
9974 {
9975         /*-
9976          * Ok this is the generic chunk service queue. we must do the
9977          * following:
9978          * - See if there are retransmits pending, if so we must
9979          *   do these first.
9980          * - Service the stream queue that is next, moving any
9981          *   message (note I must get a complete message i.e.
9982          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9983          *   TSN's
9984          * - Check to see if the cwnd/rwnd allows any output, if so we
9985          *   go ahead and fomulate and send the low level chunks. Making sure
9986          *   to combine any control in the control chunk queue also.
9987          */
9988         struct sctp_association *asoc;
9989         struct sctp_nets *net;
9990         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9991         unsigned int burst_cnt = 0;
9992         struct timeval now;
9993         int now_filled = 0;
9994         int nagle_on;
9995         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9996         int un_sent = 0;
9997         int fr_done;
9998         unsigned int tot_frs = 0;
9999
10000         asoc = &stcb->asoc;
10001 do_it_again:
10002         /* The Nagle algorithm is only applied when handling a send call. */
10003         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10004                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10005                         nagle_on = 0;
10006                 } else {
10007                         nagle_on = 1;
10008                 }
10009         } else {
10010                 nagle_on = 0;
10011         }
10012         SCTP_TCB_LOCK_ASSERT(stcb);
10013
10014         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10015
10016         if ((un_sent <= 0) &&
10017             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10018             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10019             (asoc->sent_queue_retran_cnt == 0) &&
10020             (asoc->trigger_reset == 0)) {
10021                 /* Nothing to do unless there is something to be sent left */
10022                 return;
10023         }
10024         /*
10025          * Do we have something to send, data or control AND a sack timer
10026          * running, if so piggy-back the sack.
10027          */
10028         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10029                 sctp_send_sack(stcb, so_locked);
10030                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10031         }
10032         while (asoc->sent_queue_retran_cnt) {
10033                 /*-
10034                  * Ok, it is retransmission time only, we send out only ONE
10035                  * packet with a single call off to the retran code.
10036                  */
10037                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10038                         /*-
10039                          * Special hook for handling cookiess discarded
10040                          * by peer that carried data. Send cookie-ack only
10041                          * and then the next call with get the retran's.
10042                          */
10043                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10044                             from_where,
10045                             &now, &now_filled, frag_point, so_locked);
10046                         return;
10047                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10048                         /* if its not from a HB then do it */
10049                         fr_done = 0;
10050                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10051                         if (fr_done) {
10052                                 tot_frs++;
10053                         }
10054                 } else {
10055                         /*
10056                          * its from any other place, we don't allow retran
10057                          * output (only control)
10058                          */
10059                         ret = 1;
10060                 }
10061                 if (ret > 0) {
10062                         /* Can't send anymore */
10063                         /*-
10064                          * now lets push out control by calling med-level
10065                          * output once. this assures that we WILL send HB's
10066                          * if queued too.
10067                          */
10068                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10069                             from_where,
10070                             &now, &now_filled, frag_point, so_locked);
10071 #ifdef SCTP_AUDITING_ENABLED
10072                         sctp_auditing(8, inp, stcb, NULL);
10073 #endif
10074                         sctp_timer_validation(inp, stcb, asoc);
10075                         return;
10076                 }
10077                 if (ret < 0) {
10078                         /*-
10079                          * The count was off.. retran is not happening so do
10080                          * the normal retransmission.
10081                          */
10082 #ifdef SCTP_AUDITING_ENABLED
10083                         sctp_auditing(9, inp, stcb, NULL);
10084 #endif
10085                         if (ret == SCTP_RETRAN_EXIT) {
10086                                 return;
10087                         }
10088                         break;
10089                 }
10090                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10091                         /* Only one transmission allowed out of a timeout */
10092 #ifdef SCTP_AUDITING_ENABLED
10093                         sctp_auditing(10, inp, stcb, NULL);
10094 #endif
10095                         /* Push out any control */
10096                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10097                             &now, &now_filled, frag_point, so_locked);
10098                         return;
10099                 }
10100                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10101                         /* Hit FR burst limit */
10102                         return;
10103                 }
10104                 if ((num_out == 0) && (ret == 0)) {
10105                         /* No more retrans to send */
10106                         break;
10107                 }
10108         }
10109 #ifdef SCTP_AUDITING_ENABLED
10110         sctp_auditing(12, inp, stcb, NULL);
10111 #endif
10112         /* Check for bad destinations, if they exist move chunks around. */
10113         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10114                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10115                         /*-
10116                          * if possible move things off of this address we
10117                          * still may send below due to the dormant state but
10118                          * we try to find an alternate address to send to
10119                          * and if we have one we move all queued data on the
10120                          * out wheel to this alternate address.
10121                          */
10122                         if (net->ref_count > 1)
10123                                 sctp_move_chunks_from_net(stcb, net);
10124                 } else {
10125                         /*-
10126                          * if ((asoc->sat_network) || (net->addr_is_local))
10127                          * { burst_limit = asoc->max_burst *
10128                          * SCTP_SAT_NETWORK_BURST_INCR; }
10129                          */
10130                         if (asoc->max_burst > 0) {
10131                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10132                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10133                                                 /*
10134                                                  * JRS - Use the congestion
10135                                                  * control given in the
10136                                                  * congestion control module
10137                                                  */
10138                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10139                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10140                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10141                                                 }
10142                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10143                                         }
10144                                         net->fast_retran_ip = 0;
10145                                 } else {
10146                                         if (net->flight_size == 0) {
10147                                                 /*
10148                                                  * Should be decaying the
10149                                                  * cwnd here
10150                                                  */
10151                                                 ;
10152                                         }
10153                                 }
10154                         }
10155                 }
10156
10157         }
10158         burst_cnt = 0;
10159         do {
10160                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10161                     &reason_code, 0, from_where,
10162                     &now, &now_filled, frag_point, so_locked);
10163                 if (error) {
10164                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10165                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10166                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10167                         }
10168                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10169                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10170                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10171                         }
10172                         break;
10173                 }
10174                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10175
10176                 tot_out += num_out;
10177                 burst_cnt++;
10178                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10179                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10180                         if (num_out == 0) {
10181                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10182                         }
10183                 }
10184                 if (nagle_on) {
10185                         /*
10186                          * When the Nagle algorithm is used, look at how
10187                          * much is unsent, then if its smaller than an MTU
10188                          * and we have data in flight we stop, except if we
10189                          * are handling a fragmented user message.
10190                          */
10191                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10192                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10193                             (stcb->asoc.total_flight > 0)) {
10194 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10195                                 break;
10196                         }
10197                 }
10198                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10199                     TAILQ_EMPTY(&asoc->send_queue) &&
10200                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10201                         /* Nothing left to send */
10202                         break;
10203                 }
10204                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10205                         /* Nothing left to send */
10206                         break;
10207                 }
10208         } while (num_out &&
10209             ((asoc->max_burst == 0) ||
10210             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10211             (burst_cnt < asoc->max_burst)));
10212
10213         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10214                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10215                         SCTP_STAT_INCR(sctps_maxburstqueued);
10216                         asoc->burst_limit_applied = 1;
10217                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10218                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10219                         }
10220                 } else {
10221                         asoc->burst_limit_applied = 0;
10222                 }
10223         }
10224         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10225                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10226         }
10227         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10228             tot_out);
10229
10230         /*-
10231          * Now we need to clean up the control chunk chain if a ECNE is on
10232          * it. It must be marked as UNSENT again so next call will continue
10233          * to send it until such time that we get a CWR, to remove it.
10234          */
10235         if (stcb->asoc.ecn_echo_cnt_onq)
10236                 sctp_fix_ecn_echo(asoc);
10237
10238         if (stcb->asoc.trigger_reset) {
10239                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10240                         goto do_it_again;
10241                 }
10242         }
10243         return;
10244 }
10245
10246
10247 int
10248 sctp_output(
10249     struct sctp_inpcb *inp,
10250     struct mbuf *m,
10251     struct sockaddr *addr,
10252     struct mbuf *control,
10253     struct thread *p,
10254     int flags)
10255 {
10256         if (inp == NULL) {
10257                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10258                 return (EINVAL);
10259         }
10260
10261         if (inp->sctp_socket == NULL) {
10262                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10263                 return (EINVAL);
10264         }
10265         return (sctp_sosend(inp->sctp_socket,
10266             addr,
10267             (struct uio *)NULL,
10268             m,
10269             control,
10270             flags, p
10271             ));
10272 }
10273
10274 void
10275 send_forward_tsn(struct sctp_tcb *stcb,
10276     struct sctp_association *asoc)
10277 {
10278         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10279         struct sctp_forward_tsn_chunk *fwdtsn;
10280         struct sctp_strseq *strseq;
10281         struct sctp_strseq_mid *strseq_m;
10282         uint32_t advance_peer_ack_point;
10283         unsigned int cnt_of_space, i, ovh;
10284         unsigned int space_needed;
10285         unsigned int cnt_of_skipped = 0;
10286
10287         SCTP_TCB_LOCK_ASSERT(stcb);
10288         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10289                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10290                         /* mark it to unsent */
10291                         chk->sent = SCTP_DATAGRAM_UNSENT;
10292                         chk->snd_count = 0;
10293                         /* Do we correct its output location? */
10294                         if (chk->whoTo) {
10295                                 sctp_free_remote_addr(chk->whoTo);
10296                                 chk->whoTo = NULL;
10297                         }
10298                         goto sctp_fill_in_rest;
10299                 }
10300         }
10301         /* Ok if we reach here we must build one */
10302         sctp_alloc_a_chunk(stcb, chk);
10303         if (chk == NULL) {
10304                 return;
10305         }
10306         asoc->fwd_tsn_cnt++;
10307         chk->copy_by_ref = 0;
10308         /*
10309          * We don't do the old thing here since this is used not for on-wire
10310          * but to tell if we are sending a fwd-tsn by the stack during
10311          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10312          */
10313         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10314         chk->rec.chunk_id.can_take_data = 0;
10315         chk->flags = 0;
10316         chk->asoc = asoc;
10317         chk->whoTo = NULL;
10318         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10319         if (chk->data == NULL) {
10320                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10321                 return;
10322         }
10323         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10324         chk->sent = SCTP_DATAGRAM_UNSENT;
10325         chk->snd_count = 0;
10326         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10327         asoc->ctrl_queue_cnt++;
10328 sctp_fill_in_rest:
10329         /*-
10330          * Here we go through and fill out the part that deals with
10331          * stream/seq of the ones we skip.
10332          */
10333         SCTP_BUF_LEN(chk->data) = 0;
10334         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10335                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10336                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10337                         /* no more to look at */
10338                         break;
10339                 }
10340                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10341                         /* We don't report these */
10342                         continue;
10343                 }
10344                 cnt_of_skipped++;
10345         }
10346         if (asoc->idata_supported) {
10347                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10348                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10349         } else {
10350                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10351                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10352         }
10353         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10354
10355         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10356                 ovh = SCTP_MIN_OVERHEAD;
10357         } else {
10358                 ovh = SCTP_MIN_V4_OVERHEAD;
10359         }
10360         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10361                 /* trim to a mtu size */
10362                 cnt_of_space = asoc->smallest_mtu - ovh;
10363         }
10364         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10365                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10366                     0xff, 0, cnt_of_skipped,
10367                     asoc->advanced_peer_ack_point);
10368         }
10369         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10370         if (cnt_of_space < space_needed) {
10371                 /*-
10372                  * ok we must trim down the chunk by lowering the
10373                  * advance peer ack point.
10374                  */
10375                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10376                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10377                             0xff, 0xff, cnt_of_space,
10378                             space_needed);
10379                 }
10380                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10381                 if (asoc->idata_supported) {
10382                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10383                 } else {
10384                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10385                 }
10386                 /*-
10387                  * Go through and find the TSN that will be the one
10388                  * we report.
10389                  */
10390                 at = TAILQ_FIRST(&asoc->sent_queue);
10391                 if (at != NULL) {
10392                         for (i = 0; i < cnt_of_skipped; i++) {
10393                                 tp1 = TAILQ_NEXT(at, sctp_next);
10394                                 if (tp1 == NULL) {
10395                                         break;
10396                                 }
10397                                 at = tp1;
10398                         }
10399                 }
10400                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10401                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10402                             0xff, cnt_of_skipped, at->rec.data.tsn,
10403                             asoc->advanced_peer_ack_point);
10404                 }
10405                 last = at;
10406                 /*-
10407                  * last now points to last one I can report, update
10408                  * peer ack point
10409                  */
10410                 if (last) {
10411                         advance_peer_ack_point = last->rec.data.tsn;
10412                 }
10413                 if (asoc->idata_supported) {
10414                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10415                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10416                 } else {
10417                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10418                             cnt_of_skipped * sizeof(struct sctp_strseq);
10419                 }
10420         }
10421         chk->send_size = space_needed;
10422         /* Setup the chunk */
10423         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10424         fwdtsn->ch.chunk_length = htons(chk->send_size);
10425         fwdtsn->ch.chunk_flags = 0;
10426         if (asoc->idata_supported) {
10427                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10428         } else {
10429                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10430         }
10431         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10432         SCTP_BUF_LEN(chk->data) = chk->send_size;
10433         fwdtsn++;
10434         /*-
10435          * Move pointer to after the fwdtsn and transfer to the
10436          * strseq pointer.
10437          */
10438         if (asoc->idata_supported) {
10439                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10440                 strseq = NULL;
10441         } else {
10442                 strseq = (struct sctp_strseq *)fwdtsn;
10443                 strseq_m = NULL;
10444         }
10445         /*-
10446          * Now populate the strseq list. This is done blindly
10447          * without pulling out duplicate stream info. This is
10448          * inefficent but won't harm the process since the peer will
10449          * look at these in sequence and will thus release anything.
10450          * It could mean we exceed the PMTU and chop off some that
10451          * we could have included.. but this is unlikely (aka 1432/4
10452          * would mean 300+ stream seq's would have to be reported in
10453          * one FWD-TSN. With a bit of work we can later FIX this to
10454          * optimize and pull out duplicates.. but it does add more
10455          * overhead. So for now... not!
10456          */
10457         i = 0;
10458         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10459                 if (i >= cnt_of_skipped) {
10460                         break;
10461                 }
10462                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10463                         /* We don't report these */
10464                         continue;
10465                 }
10466                 if (at->rec.data.tsn == advance_peer_ack_point) {
10467                         at->rec.data.fwd_tsn_cnt = 0;
10468                 }
10469                 if (asoc->idata_supported) {
10470                         strseq_m->sid = htons(at->rec.data.sid);
10471                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10472                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10473                         } else {
10474                                 strseq_m->flags = 0;
10475                         }
10476                         strseq_m->mid = htonl(at->rec.data.mid);
10477                         strseq_m++;
10478                 } else {
10479                         strseq->sid = htons(at->rec.data.sid);
10480                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10481                         strseq++;
10482                 }
10483                 i++;
10484         }
10485         return;
10486 }
10487
10488 void
10489 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10490 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10491     SCTP_UNUSED
10492 #endif
10493 )
10494 {
10495         /*-
10496          * Queue up a SACK or NR-SACK in the control queue.
10497          * We must first check to see if a SACK or NR-SACK is
10498          * somehow on the control queue.
10499          * If so, we will take and and remove the old one.
10500          */
10501         struct sctp_association *asoc;
10502         struct sctp_tmit_chunk *chk, *a_chk;
10503         struct sctp_sack_chunk *sack;
10504         struct sctp_nr_sack_chunk *nr_sack;
10505         struct sctp_gap_ack_block *gap_descriptor;
10506         const struct sack_track *selector;
10507         int mergeable = 0;
10508         int offset;
10509         caddr_t limit;
10510         uint32_t *dup;
10511         int limit_reached = 0;
10512         unsigned int i, siz, j;
10513         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10514         int num_dups = 0;
10515         int space_req;
10516         uint32_t highest_tsn;
10517         uint8_t flags;
10518         uint8_t type;
10519         uint8_t tsn_map;
10520
10521         if (stcb->asoc.nrsack_supported == 1) {
10522                 type = SCTP_NR_SELECTIVE_ACK;
10523         } else {
10524                 type = SCTP_SELECTIVE_ACK;
10525         }
10526         a_chk = NULL;
10527         asoc = &stcb->asoc;
10528         SCTP_TCB_LOCK_ASSERT(stcb);
10529         if (asoc->last_data_chunk_from == NULL) {
10530                 /* Hmm we never received anything */
10531                 return;
10532         }
10533         sctp_slide_mapping_arrays(stcb);
10534         sctp_set_rwnd(stcb, asoc);
10535         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10536                 if (chk->rec.chunk_id.id == type) {
10537                         /* Hmm, found a sack already on queue, remove it */
10538                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10539                         asoc->ctrl_queue_cnt--;
10540                         a_chk = chk;
10541                         if (a_chk->data) {
10542                                 sctp_m_freem(a_chk->data);
10543                                 a_chk->data = NULL;
10544                         }
10545                         if (a_chk->whoTo) {
10546                                 sctp_free_remote_addr(a_chk->whoTo);
10547                                 a_chk->whoTo = NULL;
10548                         }
10549                         break;
10550                 }
10551         }
10552         if (a_chk == NULL) {
10553                 sctp_alloc_a_chunk(stcb, a_chk);
10554                 if (a_chk == NULL) {
10555                         /* No memory so we drop the idea, and set a timer */
10556                         if (stcb->asoc.delayed_ack) {
10557                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10558                                     stcb->sctp_ep, stcb, NULL,
10559                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10560                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10561                                     stcb->sctp_ep, stcb, NULL);
10562                         } else {
10563                                 stcb->asoc.send_sack = 1;
10564                         }
10565                         return;
10566                 }
10567                 a_chk->copy_by_ref = 0;
10568                 a_chk->rec.chunk_id.id = type;
10569                 a_chk->rec.chunk_id.can_take_data = 1;
10570         }
10571         /* Clear our pkt counts */
10572         asoc->data_pkts_seen = 0;
10573
10574         a_chk->flags = 0;
10575         a_chk->asoc = asoc;
10576         a_chk->snd_count = 0;
10577         a_chk->send_size = 0;   /* fill in later */
10578         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10579         a_chk->whoTo = NULL;
10580
10581         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10582                 /*-
10583                  * Ok, the destination for the SACK is unreachable, lets see if
10584                  * we can select an alternate to asoc->last_data_chunk_from
10585                  */
10586                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10587                 if (a_chk->whoTo == NULL) {
10588                         /* Nope, no alternate */
10589                         a_chk->whoTo = asoc->last_data_chunk_from;
10590                 }
10591         } else {
10592                 a_chk->whoTo = asoc->last_data_chunk_from;
10593         }
10594         if (a_chk->whoTo) {
10595                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10596         }
10597         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10598                 highest_tsn = asoc->highest_tsn_inside_map;
10599         } else {
10600                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10601         }
10602         if (highest_tsn == asoc->cumulative_tsn) {
10603                 /* no gaps */
10604                 if (type == SCTP_SELECTIVE_ACK) {
10605                         space_req = sizeof(struct sctp_sack_chunk);
10606                 } else {
10607                         space_req = sizeof(struct sctp_nr_sack_chunk);
10608                 }
10609         } else {
10610                 /* gaps get a cluster */
10611                 space_req = MCLBYTES;
10612         }
10613         /* Ok now lets formulate a MBUF with our sack */
10614         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10615         if ((a_chk->data == NULL) ||
10616             (a_chk->whoTo == NULL)) {
10617                 /* rats, no mbuf memory */
10618                 if (a_chk->data) {
10619                         /* was a problem with the destination */
10620                         sctp_m_freem(a_chk->data);
10621                         a_chk->data = NULL;
10622                 }
10623                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10624                 /* sa_ignore NO_NULL_CHK */
10625                 if (stcb->asoc.delayed_ack) {
10626                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10627                             stcb->sctp_ep, stcb, NULL,
10628                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10629                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10630                             stcb->sctp_ep, stcb, NULL);
10631                 } else {
10632                         stcb->asoc.send_sack = 1;
10633                 }
10634                 return;
10635         }
10636         /* ok, lets go through and fill it in */
10637         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10638         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10639         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10640                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10641         }
10642         limit = mtod(a_chk->data, caddr_t);
10643         limit += space;
10644
10645         flags = 0;
10646
10647         if ((asoc->sctp_cmt_on_off > 0) &&
10648             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10649                 /*-
10650                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10651                  * received, then set high bit to 1, else 0. Reset
10652                  * pkts_rcvd.
10653                  */
10654                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10655                 asoc->cmt_dac_pkts_rcvd = 0;
10656         }
10657 #ifdef SCTP_ASOCLOG_OF_TSNS
10658         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10659         stcb->asoc.cumack_log_atsnt++;
10660         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10661                 stcb->asoc.cumack_log_atsnt = 0;
10662         }
10663 #endif
10664         /* reset the readers interpretation */
10665         stcb->freed_by_sorcv_sincelast = 0;
10666
10667         if (type == SCTP_SELECTIVE_ACK) {
10668                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10669                 nr_sack = NULL;
10670                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10671                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10672                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10673                 } else {
10674                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10675                 }
10676         } else {
10677                 sack = NULL;
10678                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10679                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10680                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10681                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10682                 } else {
10683                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10684                 }
10685         }
10686
10687         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10688                 offset = 1;
10689         } else {
10690                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10691         }
10692         if (((type == SCTP_SELECTIVE_ACK) &&
10693             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10694             ((type == SCTP_NR_SELECTIVE_ACK) &&
10695             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10696                 /* we have a gap .. maybe */
10697                 for (i = 0; i < siz; i++) {
10698                         tsn_map = asoc->mapping_array[i];
10699                         if (type == SCTP_SELECTIVE_ACK) {
10700                                 tsn_map |= asoc->nr_mapping_array[i];
10701                         }
10702                         if (i == 0) {
10703                                 /*
10704                                  * Clear all bits corresponding to TSNs
10705                                  * smaller or equal to the cumulative TSN.
10706                                  */
10707                                 tsn_map &= (~0U << (1 - offset));
10708                         }
10709                         selector = &sack_array[tsn_map];
10710                         if (mergeable && selector->right_edge) {
10711                                 /*
10712                                  * Backup, left and right edges were ok to
10713                                  * merge.
10714                                  */
10715                                 num_gap_blocks--;
10716                                 gap_descriptor--;
10717                         }
10718                         if (selector->num_entries == 0)
10719                                 mergeable = 0;
10720                         else {
10721                                 for (j = 0; j < selector->num_entries; j++) {
10722                                         if (mergeable && selector->right_edge) {
10723                                                 /*
10724                                                  * do a merge by NOT setting
10725                                                  * the left side
10726                                                  */
10727                                                 mergeable = 0;
10728                                         } else {
10729                                                 /*
10730                                                  * no merge, set the left
10731                                                  * side
10732                                                  */
10733                                                 mergeable = 0;
10734                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10735                                         }
10736                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10737                                         num_gap_blocks++;
10738                                         gap_descriptor++;
10739                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10740                                                 /* no more room */
10741                                                 limit_reached = 1;
10742                                                 break;
10743                                         }
10744                                 }
10745                                 if (selector->left_edge) {
10746                                         mergeable = 1;
10747                                 }
10748                         }
10749                         if (limit_reached) {
10750                                 /* Reached the limit stop */
10751                                 break;
10752                         }
10753                         offset += 8;
10754                 }
10755         }
10756         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10757             (limit_reached == 0)) {
10758
10759                 mergeable = 0;
10760
10761                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10762                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10763                 } else {
10764                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10765                 }
10766
10767                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10768                         offset = 1;
10769                 } else {
10770                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10771                 }
10772                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10773                         /* we have a gap .. maybe */
10774                         for (i = 0; i < siz; i++) {
10775                                 tsn_map = asoc->nr_mapping_array[i];
10776                                 if (i == 0) {
10777                                         /*
10778                                          * Clear all bits corresponding to
10779                                          * TSNs smaller or equal to the
10780                                          * cumulative TSN.
10781                                          */
10782                                         tsn_map &= (~0U << (1 - offset));
10783                                 }
10784                                 selector = &sack_array[tsn_map];
10785                                 if (mergeable && selector->right_edge) {
10786                                         /*
10787                                          * Backup, left and right edges were
10788                                          * ok to merge.
10789                                          */
10790                                         num_nr_gap_blocks--;
10791                                         gap_descriptor--;
10792                                 }
10793                                 if (selector->num_entries == 0)
10794                                         mergeable = 0;
10795                                 else {
10796                                         for (j = 0; j < selector->num_entries; j++) {
10797                                                 if (mergeable && selector->right_edge) {
10798                                                         /*
10799                                                          * do a merge by NOT
10800                                                          * setting the left
10801                                                          * side
10802                                                          */
10803                                                         mergeable = 0;
10804                                                 } else {
10805                                                         /*
10806                                                          * no merge, set the
10807                                                          * left side
10808                                                          */
10809                                                         mergeable = 0;
10810                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10811                                                 }
10812                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10813                                                 num_nr_gap_blocks++;
10814                                                 gap_descriptor++;
10815                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10816                                                         /* no more room */
10817                                                         limit_reached = 1;
10818                                                         break;
10819                                                 }
10820                                         }
10821                                         if (selector->left_edge) {
10822                                                 mergeable = 1;
10823                                         }
10824                                 }
10825                                 if (limit_reached) {
10826                                         /* Reached the limit stop */
10827                                         break;
10828                                 }
10829                                 offset += 8;
10830                         }
10831                 }
10832         }
10833         /* now we must add any dups we are going to report. */
10834         if ((limit_reached == 0) && (asoc->numduptsns)) {
10835                 dup = (uint32_t *)gap_descriptor;
10836                 for (i = 0; i < asoc->numduptsns; i++) {
10837                         *dup = htonl(asoc->dup_tsns[i]);
10838                         dup++;
10839                         num_dups++;
10840                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10841                                 /* no more room */
10842                                 break;
10843                         }
10844                 }
10845                 asoc->numduptsns = 0;
10846         }
10847         /*
10848          * now that the chunk is prepared queue it to the control chunk
10849          * queue.
10850          */
10851         if (type == SCTP_SELECTIVE_ACK) {
10852                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10853                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10854                     num_dups * sizeof(int32_t));
10855                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10856                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10857                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10858                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10859                 sack->sack.num_dup_tsns = htons(num_dups);
10860                 sack->ch.chunk_type = type;
10861                 sack->ch.chunk_flags = flags;
10862                 sack->ch.chunk_length = htons(a_chk->send_size);
10863         } else {
10864                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10865                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10866                     num_dups * sizeof(int32_t));
10867                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10868                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10869                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10870                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10871                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10872                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10873                 nr_sack->nr_sack.reserved = 0;
10874                 nr_sack->ch.chunk_type = type;
10875                 nr_sack->ch.chunk_flags = flags;
10876                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10877         }
10878         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10879         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10880         asoc->ctrl_queue_cnt++;
10881         asoc->send_sack = 0;
10882         SCTP_STAT_INCR(sctps_sendsacks);
10883         return;
10884 }
10885
10886 void
10887 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10888 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10889     SCTP_UNUSED
10890 #endif
10891 )
10892 {
10893         struct mbuf *m_abort, *m, *m_last;
10894         struct mbuf *m_out, *m_end = NULL;
10895         struct sctp_abort_chunk *abort;
10896         struct sctp_auth_chunk *auth = NULL;
10897         struct sctp_nets *net;
10898         uint32_t vtag;
10899         uint32_t auth_offset = 0;
10900         int error;
10901         uint16_t cause_len, chunk_len, padding_len;
10902
10903         SCTP_TCB_LOCK_ASSERT(stcb);
10904         /*-
10905          * Add an AUTH chunk, if chunk requires it and save the offset into
10906          * the chain for AUTH
10907          */
10908         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10909             stcb->asoc.peer_auth_chunks)) {
10910                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10911                     stcb, SCTP_ABORT_ASSOCIATION);
10912                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10913         } else {
10914                 m_out = NULL;
10915         }
10916         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10917         if (m_abort == NULL) {
10918                 if (m_out) {
10919                         sctp_m_freem(m_out);
10920                 }
10921                 if (operr) {
10922                         sctp_m_freem(operr);
10923                 }
10924                 return;
10925         }
10926         /* link in any error */
10927         SCTP_BUF_NEXT(m_abort) = operr;
10928         cause_len = 0;
10929         m_last = NULL;
10930         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10931                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10932                 if (SCTP_BUF_NEXT(m) == NULL) {
10933                         m_last = m;
10934                 }
10935         }
10936         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10937         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10938         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10939         if (m_out == NULL) {
10940                 /* NO Auth chunk prepended, so reserve space in front */
10941                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10942                 m_out = m_abort;
10943         } else {
10944                 /* Put AUTH chunk at the front of the chain */
10945                 SCTP_BUF_NEXT(m_end) = m_abort;
10946         }
10947         if (stcb->asoc.alternate) {
10948                 net = stcb->asoc.alternate;
10949         } else {
10950                 net = stcb->asoc.primary_destination;
10951         }
10952         /* Fill in the ABORT chunk header. */
10953         abort = mtod(m_abort, struct sctp_abort_chunk *);
10954         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10955         if (stcb->asoc.peer_vtag == 0) {
10956                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10957                 vtag = stcb->asoc.my_vtag;
10958                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10959         } else {
10960                 vtag = stcb->asoc.peer_vtag;
10961                 abort->ch.chunk_flags = 0;
10962         }
10963         abort->ch.chunk_length = htons(chunk_len);
10964         /* Add padding, if necessary. */
10965         if (padding_len > 0) {
10966                 if ((m_last == NULL) ||
10967                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10968                         sctp_m_freem(m_out);
10969                         return;
10970                 }
10971         }
10972         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10973             (struct sockaddr *)&net->ro._l_addr,
10974             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10975             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10976             stcb->asoc.primary_destination->port, NULL,
10977             0, 0,
10978             so_locked))) {
10979                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10980                 if (error == ENOBUFS) {
10981                         stcb->asoc.ifp_had_enobuf = 1;
10982                         SCTP_STAT_INCR(sctps_lowlevelerr);
10983                 }
10984         } else {
10985                 stcb->asoc.ifp_had_enobuf = 0;
10986         }
10987         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10988 }
10989
10990 void
10991 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10992     struct sctp_nets *net,
10993     int reflect_vtag)
10994 {
10995         /* formulate and SEND a SHUTDOWN-COMPLETE */
10996         struct mbuf *m_shutdown_comp;
10997         struct sctp_shutdown_complete_chunk *shutdown_complete;
10998         uint32_t vtag;
10999         int error;
11000         uint8_t flags;
11001
11002         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11003         if (m_shutdown_comp == NULL) {
11004                 /* no mbuf's */
11005                 return;
11006         }
11007         if (reflect_vtag) {
11008                 flags = SCTP_HAD_NO_TCB;
11009                 vtag = stcb->asoc.my_vtag;
11010         } else {
11011                 flags = 0;
11012                 vtag = stcb->asoc.peer_vtag;
11013         }
11014         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11015         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11016         shutdown_complete->ch.chunk_flags = flags;
11017         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11018         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11019         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11020             (struct sockaddr *)&net->ro._l_addr,
11021             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11022             stcb->sctp_ep->sctp_lport, stcb->rport,
11023             htonl(vtag),
11024             net->port, NULL,
11025             0, 0,
11026             SCTP_SO_NOT_LOCKED))) {
11027                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11028                 if (error == ENOBUFS) {
11029                         stcb->asoc.ifp_had_enobuf = 1;
11030                         SCTP_STAT_INCR(sctps_lowlevelerr);
11031                 }
11032         } else {
11033                 stcb->asoc.ifp_had_enobuf = 0;
11034         }
11035         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11036         return;
11037 }
11038
11039 static void
11040 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11041     struct sctphdr *sh, uint32_t vtag,
11042     uint8_t type, struct mbuf *cause,
11043     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11044     uint32_t vrf_id, uint16_t port)
11045 {
11046         struct mbuf *o_pak;
11047         struct mbuf *mout;
11048         struct sctphdr *shout;
11049         struct sctp_chunkhdr *ch;
11050 #if defined(INET) || defined(INET6)
11051         struct udphdr *udp;
11052 #endif
11053         int ret, len, cause_len, padding_len;
11054 #ifdef INET
11055         struct sockaddr_in *src_sin, *dst_sin;
11056         struct ip *ip;
11057 #endif
11058 #ifdef INET6
11059         struct sockaddr_in6 *src_sin6, *dst_sin6;
11060         struct ip6_hdr *ip6;
11061 #endif
11062
11063         /* Compute the length of the cause and add final padding. */
11064         cause_len = 0;
11065         if (cause != NULL) {
11066                 struct mbuf *m_at, *m_last = NULL;
11067
11068                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11069                         if (SCTP_BUF_NEXT(m_at) == NULL)
11070                                 m_last = m_at;
11071                         cause_len += SCTP_BUF_LEN(m_at);
11072                 }
11073                 padding_len = cause_len % 4;
11074                 if (padding_len != 0) {
11075                         padding_len = 4 - padding_len;
11076                 }
11077                 if (padding_len != 0) {
11078                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11079                                 sctp_m_freem(cause);
11080                                 return;
11081                         }
11082                 }
11083         } else {
11084                 padding_len = 0;
11085         }
11086         /* Get an mbuf for the header. */
11087         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11088         switch (dst->sa_family) {
11089 #ifdef INET
11090         case AF_INET:
11091                 len += sizeof(struct ip);
11092                 break;
11093 #endif
11094 #ifdef INET6
11095         case AF_INET6:
11096                 len += sizeof(struct ip6_hdr);
11097                 break;
11098 #endif
11099         default:
11100                 break;
11101         }
11102 #if defined(INET) || defined(INET6)
11103         if (port) {
11104                 len += sizeof(struct udphdr);
11105         }
11106 #endif
11107         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11108         if (mout == NULL) {
11109                 if (cause) {
11110                         sctp_m_freem(cause);
11111                 }
11112                 return;
11113         }
11114         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11115         SCTP_BUF_LEN(mout) = len;
11116         SCTP_BUF_NEXT(mout) = cause;
11117         M_SETFIB(mout, fibnum);
11118         mout->m_pkthdr.flowid = mflowid;
11119         M_HASHTYPE_SET(mout, mflowtype);
11120 #ifdef INET
11121         ip = NULL;
11122 #endif
11123 #ifdef INET6
11124         ip6 = NULL;
11125 #endif
11126         switch (dst->sa_family) {
11127 #ifdef INET
11128         case AF_INET:
11129                 src_sin = (struct sockaddr_in *)src;
11130                 dst_sin = (struct sockaddr_in *)dst;
11131                 ip = mtod(mout, struct ip *);
11132                 ip->ip_v = IPVERSION;
11133                 ip->ip_hl = (sizeof(struct ip) >> 2);
11134                 ip->ip_tos = 0;
11135                 ip->ip_off = htons(IP_DF);
11136                 ip_fillid(ip);
11137                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11138                 if (port) {
11139                         ip->ip_p = IPPROTO_UDP;
11140                 } else {
11141                         ip->ip_p = IPPROTO_SCTP;
11142                 }
11143                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11144                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11145                 ip->ip_sum = 0;
11146                 len = sizeof(struct ip);
11147                 shout = (struct sctphdr *)((caddr_t)ip + len);
11148                 break;
11149 #endif
11150 #ifdef INET6
11151         case AF_INET6:
11152                 src_sin6 = (struct sockaddr_in6 *)src;
11153                 dst_sin6 = (struct sockaddr_in6 *)dst;
11154                 ip6 = mtod(mout, struct ip6_hdr *);
11155                 ip6->ip6_flow = htonl(0x60000000);
11156                 if (V_ip6_auto_flowlabel) {
11157                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11158                 }
11159                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11160                 if (port) {
11161                         ip6->ip6_nxt = IPPROTO_UDP;
11162                 } else {
11163                         ip6->ip6_nxt = IPPROTO_SCTP;
11164                 }
11165                 ip6->ip6_src = dst_sin6->sin6_addr;
11166                 ip6->ip6_dst = src_sin6->sin6_addr;
11167                 len = sizeof(struct ip6_hdr);
11168                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11169                 break;
11170 #endif
11171         default:
11172                 len = 0;
11173                 shout = mtod(mout, struct sctphdr *);
11174                 break;
11175         }
11176 #if defined(INET) || defined(INET6)
11177         if (port) {
11178                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11179                         sctp_m_freem(mout);
11180                         return;
11181                 }
11182                 udp = (struct udphdr *)shout;
11183                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11184                 udp->uh_dport = port;
11185                 udp->uh_sum = 0;
11186                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11187                     sizeof(struct sctphdr) +
11188                     sizeof(struct sctp_chunkhdr) +
11189                     cause_len + padding_len));
11190                 len += sizeof(struct udphdr);
11191                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11192         } else {
11193                 udp = NULL;
11194         }
11195 #endif
11196         shout->src_port = sh->dest_port;
11197         shout->dest_port = sh->src_port;
11198         shout->checksum = 0;
11199         if (vtag) {
11200                 shout->v_tag = htonl(vtag);
11201         } else {
11202                 shout->v_tag = sh->v_tag;
11203         }
11204         len += sizeof(struct sctphdr);
11205         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11206         ch->chunk_type = type;
11207         if (vtag) {
11208                 ch->chunk_flags = 0;
11209         } else {
11210                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11211         }
11212         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11213         len += sizeof(struct sctp_chunkhdr);
11214         len += cause_len + padding_len;
11215
11216         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11217                 sctp_m_freem(mout);
11218                 return;
11219         }
11220         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11221         switch (dst->sa_family) {
11222 #ifdef INET
11223         case AF_INET:
11224                 if (port) {
11225                         if (V_udp_cksum) {
11226                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11227                         } else {
11228                                 udp->uh_sum = 0;
11229                         }
11230                 }
11231                 ip->ip_len = htons(len);
11232                 if (port) {
11233                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11234                         SCTP_STAT_INCR(sctps_sendswcrc);
11235                         if (V_udp_cksum) {
11236                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11237                         }
11238                 } else {
11239                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11240                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11241                         SCTP_STAT_INCR(sctps_sendhwcrc);
11242                 }
11243 #ifdef SCTP_PACKET_LOGGING
11244                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11245                         sctp_packet_log(o_pak);
11246                 }
11247 #endif
11248                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11249                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11250                 break;
11251 #endif
11252 #ifdef INET6
11253         case AF_INET6:
11254                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11255                 if (port) {
11256                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11257                         SCTP_STAT_INCR(sctps_sendswcrc);
11258                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11259                                 udp->uh_sum = 0xffff;
11260                         }
11261                 } else {
11262                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11263                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11264                         SCTP_STAT_INCR(sctps_sendhwcrc);
11265                 }
11266 #ifdef SCTP_PACKET_LOGGING
11267                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11268                         sctp_packet_log(o_pak);
11269                 }
11270 #endif
11271                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11272                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11273                 break;
11274 #endif
11275         default:
11276                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11277                     dst->sa_family);
11278                 sctp_m_freem(mout);
11279                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11280                 return;
11281         }
11282         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11283         if (port) {
11284                 UDPSTAT_INC(udps_opackets);
11285         }
11286         SCTP_STAT_INCR(sctps_sendpackets);
11287         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11288         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11289         if (ret) {
11290                 SCTP_STAT_INCR(sctps_senderrors);
11291         }
11292         return;
11293 }
11294
11295 void
11296 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11297     struct sctphdr *sh,
11298     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11299     uint32_t vrf_id, uint16_t port)
11300 {
11301         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11302             mflowtype, mflowid, fibnum,
11303             vrf_id, port);
11304 }
11305
11306 void
11307 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11308 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11309     SCTP_UNUSED
11310 #endif
11311 )
11312 {
11313         struct sctp_tmit_chunk *chk;
11314         struct sctp_heartbeat_chunk *hb;
11315         struct timeval now;
11316
11317         SCTP_TCB_LOCK_ASSERT(stcb);
11318         if (net == NULL) {
11319                 return;
11320         }
11321         (void)SCTP_GETTIME_TIMEVAL(&now);
11322         switch (net->ro._l_addr.sa.sa_family) {
11323 #ifdef INET
11324         case AF_INET:
11325                 break;
11326 #endif
11327 #ifdef INET6
11328         case AF_INET6:
11329                 break;
11330 #endif
11331         default:
11332                 return;
11333         }
11334         sctp_alloc_a_chunk(stcb, chk);
11335         if (chk == NULL) {
11336                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11337                 return;
11338         }
11339
11340         chk->copy_by_ref = 0;
11341         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11342         chk->rec.chunk_id.can_take_data = 1;
11343         chk->flags = 0;
11344         chk->asoc = &stcb->asoc;
11345         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11346
11347         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11348         if (chk->data == NULL) {
11349                 sctp_free_a_chunk(stcb, chk, so_locked);
11350                 return;
11351         }
11352         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11353         SCTP_BUF_LEN(chk->data) = chk->send_size;
11354         chk->sent = SCTP_DATAGRAM_UNSENT;
11355         chk->snd_count = 0;
11356         chk->whoTo = net;
11357         atomic_add_int(&chk->whoTo->ref_count, 1);
11358         /* Now we have a mbuf that we can fill in with the details */
11359         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11360         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11361         /* fill out chunk header */
11362         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11363         hb->ch.chunk_flags = 0;
11364         hb->ch.chunk_length = htons(chk->send_size);
11365         /* Fill out hb parameter */
11366         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11367         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11368         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11369         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11370         /* Did our user request this one, put it in */
11371         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11372         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11373         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11374                 /*
11375                  * we only take from the entropy pool if the address is not
11376                  * confirmed.
11377                  */
11378                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11379                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11380         } else {
11381                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11382                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11383         }
11384         switch (net->ro._l_addr.sa.sa_family) {
11385 #ifdef INET
11386         case AF_INET:
11387                 memcpy(hb->heartbeat.hb_info.address,
11388                     &net->ro._l_addr.sin.sin_addr,
11389                     sizeof(net->ro._l_addr.sin.sin_addr));
11390                 break;
11391 #endif
11392 #ifdef INET6
11393         case AF_INET6:
11394                 memcpy(hb->heartbeat.hb_info.address,
11395                     &net->ro._l_addr.sin6.sin6_addr,
11396                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11397                 break;
11398 #endif
11399         default:
11400                 if (chk->data) {
11401                         sctp_m_freem(chk->data);
11402                         chk->data = NULL;
11403                 }
11404                 sctp_free_a_chunk(stcb, chk, so_locked);
11405                 return;
11406                 break;
11407         }
11408         net->hb_responded = 0;
11409         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11410         stcb->asoc.ctrl_queue_cnt++;
11411         SCTP_STAT_INCR(sctps_sendheartbeat);
11412         return;
11413 }
11414
11415 void
11416 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11417     uint32_t high_tsn)
11418 {
11419         struct sctp_association *asoc;
11420         struct sctp_ecne_chunk *ecne;
11421         struct sctp_tmit_chunk *chk;
11422
11423         if (net == NULL) {
11424                 return;
11425         }
11426         asoc = &stcb->asoc;
11427         SCTP_TCB_LOCK_ASSERT(stcb);
11428         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11429                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11430                         /* found a previous ECN_ECHO update it if needed */
11431                         uint32_t cnt, ctsn;
11432
11433                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11434                         ctsn = ntohl(ecne->tsn);
11435                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11436                                 ecne->tsn = htonl(high_tsn);
11437                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11438                         }
11439                         cnt = ntohl(ecne->num_pkts_since_cwr);
11440                         cnt++;
11441                         ecne->num_pkts_since_cwr = htonl(cnt);
11442                         return;
11443                 }
11444         }
11445         /* nope could not find one to update so we must build one */
11446         sctp_alloc_a_chunk(stcb, chk);
11447         if (chk == NULL) {
11448                 return;
11449         }
11450         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11451         chk->copy_by_ref = 0;
11452         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11453         chk->rec.chunk_id.can_take_data = 0;
11454         chk->flags = 0;
11455         chk->asoc = &stcb->asoc;
11456         chk->send_size = sizeof(struct sctp_ecne_chunk);
11457         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11458         if (chk->data == NULL) {
11459                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11460                 return;
11461         }
11462         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11463         SCTP_BUF_LEN(chk->data) = chk->send_size;
11464         chk->sent = SCTP_DATAGRAM_UNSENT;
11465         chk->snd_count = 0;
11466         chk->whoTo = net;
11467         atomic_add_int(&chk->whoTo->ref_count, 1);
11468
11469         stcb->asoc.ecn_echo_cnt_onq++;
11470         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11471         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11472         ecne->ch.chunk_flags = 0;
11473         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11474         ecne->tsn = htonl(high_tsn);
11475         ecne->num_pkts_since_cwr = htonl(1);
11476         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11477         asoc->ctrl_queue_cnt++;
11478 }
11479
11480 void
11481 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11482     struct mbuf *m, int len, int iphlen, int bad_crc)
11483 {
11484         struct sctp_association *asoc;
11485         struct sctp_pktdrop_chunk *drp;
11486         struct sctp_tmit_chunk *chk;
11487         uint8_t *datap;
11488         int was_trunc = 0;
11489         int fullsz = 0;
11490         long spc;
11491         int offset;
11492         struct sctp_chunkhdr *ch, chunk_buf;
11493         unsigned int chk_length;
11494
11495         if (!stcb) {
11496                 return;
11497         }
11498         asoc = &stcb->asoc;
11499         SCTP_TCB_LOCK_ASSERT(stcb);
11500         if (asoc->pktdrop_supported == 0) {
11501                 /*-
11502                  * peer must declare support before I send one.
11503                  */
11504                 return;
11505         }
11506         if (stcb->sctp_socket == NULL) {
11507                 return;
11508         }
11509         sctp_alloc_a_chunk(stcb, chk);
11510         if (chk == NULL) {
11511                 return;
11512         }
11513         chk->copy_by_ref = 0;
11514         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11515         chk->rec.chunk_id.can_take_data = 1;
11516         chk->flags = 0;
11517         len -= iphlen;
11518         chk->send_size = len;
11519         /* Validate that we do not have an ABORT in here. */
11520         offset = iphlen + sizeof(struct sctphdr);
11521         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11522             sizeof(*ch), (uint8_t *)&chunk_buf);
11523         while (ch != NULL) {
11524                 chk_length = ntohs(ch->chunk_length);
11525                 if (chk_length < sizeof(*ch)) {
11526                         /* break to abort land */
11527                         break;
11528                 }
11529                 switch (ch->chunk_type) {
11530                 case SCTP_PACKET_DROPPED:
11531                 case SCTP_ABORT_ASSOCIATION:
11532                 case SCTP_INITIATION_ACK:
11533                         /**
11534                          * We don't respond with an PKT-DROP to an ABORT
11535                          * or PKT-DROP. We also do not respond to an
11536                          * INIT-ACK, because we can't know if the initiation
11537                          * tag is correct or not.
11538                          */
11539                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11540                         return;
11541                 default:
11542                         break;
11543                 }
11544                 offset += SCTP_SIZE32(chk_length);
11545                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11546                     sizeof(*ch), (uint8_t *)&chunk_buf);
11547         }
11548
11549         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11550             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11551                 /*
11552                  * only send 1 mtu worth, trim off the excess on the end.
11553                  */
11554                 fullsz = len;
11555                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11556                 was_trunc = 1;
11557         }
11558         chk->asoc = &stcb->asoc;
11559         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11560         if (chk->data == NULL) {
11561 jump_out:
11562                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11563                 return;
11564         }
11565         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11566         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11567         if (drp == NULL) {
11568                 sctp_m_freem(chk->data);
11569                 chk->data = NULL;
11570                 goto jump_out;
11571         }
11572         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11573             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11574         chk->book_size_scale = 0;
11575         if (was_trunc) {
11576                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11577                 drp->trunc_len = htons(fullsz);
11578                 /*
11579                  * Len is already adjusted to size minus overhead above take
11580                  * out the pkt_drop chunk itself from it.
11581                  */
11582                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11583                 len = chk->send_size;
11584         } else {
11585                 /* no truncation needed */
11586                 drp->ch.chunk_flags = 0;
11587                 drp->trunc_len = htons(0);
11588         }
11589         if (bad_crc) {
11590                 drp->ch.chunk_flags |= SCTP_BADCRC;
11591         }
11592         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11593         SCTP_BUF_LEN(chk->data) = chk->send_size;
11594         chk->sent = SCTP_DATAGRAM_UNSENT;
11595         chk->snd_count = 0;
11596         if (net) {
11597                 /* we should hit here */
11598                 chk->whoTo = net;
11599                 atomic_add_int(&chk->whoTo->ref_count, 1);
11600         } else {
11601                 chk->whoTo = NULL;
11602         }
11603         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11604         drp->ch.chunk_length = htons(chk->send_size);
11605         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11606         if (spc < 0) {
11607                 spc = 0;
11608         }
11609         drp->bottle_bw = htonl(spc);
11610         if (asoc->my_rwnd) {
11611                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11612                     asoc->size_on_all_streams +
11613                     asoc->my_rwnd_control_len +
11614                     stcb->sctp_socket->so_rcv.sb_cc);
11615         } else {
11616                 /*-
11617                  * If my rwnd is 0, possibly from mbuf depletion as well as
11618                  * space used, tell the peer there is NO space aka onq == bw
11619                  */
11620                 drp->current_onq = htonl(spc);
11621         }
11622         drp->reserved = 0;
11623         datap = drp->data;
11624         m_copydata(m, iphlen, len, (caddr_t)datap);
11625         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11626         asoc->ctrl_queue_cnt++;
11627 }
11628
11629 void
11630 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11631 {
11632         struct sctp_association *asoc;
11633         struct sctp_cwr_chunk *cwr;
11634         struct sctp_tmit_chunk *chk;
11635
11636         SCTP_TCB_LOCK_ASSERT(stcb);
11637         if (net == NULL) {
11638                 return;
11639         }
11640         asoc = &stcb->asoc;
11641         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11642                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11643                         /*
11644                          * found a previous CWR queued to same destination
11645                          * update it if needed
11646                          */
11647                         uint32_t ctsn;
11648
11649                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11650                         ctsn = ntohl(cwr->tsn);
11651                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11652                                 cwr->tsn = htonl(high_tsn);
11653                         }
11654                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11655                                 /* Make sure override is carried */
11656                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11657                         }
11658                         return;
11659                 }
11660         }
11661         sctp_alloc_a_chunk(stcb, chk);
11662         if (chk == NULL) {
11663                 return;
11664         }
11665         chk->copy_by_ref = 0;
11666         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11667         chk->rec.chunk_id.can_take_data = 1;
11668         chk->flags = 0;
11669         chk->asoc = &stcb->asoc;
11670         chk->send_size = sizeof(struct sctp_cwr_chunk);
11671         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11672         if (chk->data == NULL) {
11673                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11674                 return;
11675         }
11676         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11677         SCTP_BUF_LEN(chk->data) = chk->send_size;
11678         chk->sent = SCTP_DATAGRAM_UNSENT;
11679         chk->snd_count = 0;
11680         chk->whoTo = net;
11681         atomic_add_int(&chk->whoTo->ref_count, 1);
11682         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11683         cwr->ch.chunk_type = SCTP_ECN_CWR;
11684         cwr->ch.chunk_flags = override;
11685         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11686         cwr->tsn = htonl(high_tsn);
11687         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11688         asoc->ctrl_queue_cnt++;
11689 }
11690
11691 static int
11692 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11693     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11694 {
11695         uint16_t len, old_len, i;
11696         struct sctp_stream_reset_out_request *req_out;
11697         struct sctp_chunkhdr *ch;
11698         int at;
11699         int number_entries = 0;
11700
11701         ch = mtod(chk->data, struct sctp_chunkhdr *);
11702         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11703         /* get to new offset for the param. */
11704         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11705         /* now how long will this param be? */
11706         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11707                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11708                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11709                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11710                         number_entries++;
11711                 }
11712         }
11713         if (number_entries == 0) {
11714                 return (0);
11715         }
11716         if (number_entries == stcb->asoc.streamoutcnt) {
11717                 number_entries = 0;
11718         }
11719         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11720                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11721         }
11722         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11723         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11724         req_out->ph.param_length = htons(len);
11725         req_out->request_seq = htonl(seq);
11726         req_out->response_seq = htonl(resp_seq);
11727         req_out->send_reset_at_tsn = htonl(last_sent);
11728         at = 0;
11729         if (number_entries) {
11730                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11731                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11732                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11733                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11734                                 req_out->list_of_streams[at] = htons(i);
11735                                 at++;
11736                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11737                                 if (at >= number_entries) {
11738                                         break;
11739                                 }
11740                         }
11741                 }
11742         } else {
11743                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11744                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11745                 }
11746         }
11747         if (SCTP_SIZE32(len) > len) {
11748                 /*-
11749                  * Need to worry about the pad we may end up adding to the
11750                  * end. This is easy since the struct is either aligned to 4
11751                  * bytes or 2 bytes off.
11752                  */
11753                 req_out->list_of_streams[number_entries] = 0;
11754         }
11755         /* now fix the chunk length */
11756         ch->chunk_length = htons(len + old_len);
11757         chk->book_size = len + old_len;
11758         chk->book_size_scale = 0;
11759         chk->send_size = SCTP_SIZE32(chk->book_size);
11760         SCTP_BUF_LEN(chk->data) = chk->send_size;
11761         return (1);
11762 }
11763
11764 static void
11765 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11766     int number_entries, uint16_t *list,
11767     uint32_t seq)
11768 {
11769         uint16_t len, old_len, i;
11770         struct sctp_stream_reset_in_request *req_in;
11771         struct sctp_chunkhdr *ch;
11772
11773         ch = mtod(chk->data, struct sctp_chunkhdr *);
11774         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11775
11776         /* get to new offset for the param. */
11777         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11778         /* now how long will this param be? */
11779         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11780         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11781         req_in->ph.param_length = htons(len);
11782         req_in->request_seq = htonl(seq);
11783         if (number_entries) {
11784                 for (i = 0; i < number_entries; i++) {
11785                         req_in->list_of_streams[i] = htons(list[i]);
11786                 }
11787         }
11788         if (SCTP_SIZE32(len) > len) {
11789                 /*-
11790                  * Need to worry about the pad we may end up adding to the
11791                  * end. This is easy since the struct is either aligned to 4
11792                  * bytes or 2 bytes off.
11793                  */
11794                 req_in->list_of_streams[number_entries] = 0;
11795         }
11796         /* now fix the chunk length */
11797         ch->chunk_length = htons(len + old_len);
11798         chk->book_size = len + old_len;
11799         chk->book_size_scale = 0;
11800         chk->send_size = SCTP_SIZE32(chk->book_size);
11801         SCTP_BUF_LEN(chk->data) = chk->send_size;
11802         return;
11803 }
11804
11805 static void
11806 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11807     uint32_t seq)
11808 {
11809         uint16_t len, old_len;
11810         struct sctp_stream_reset_tsn_request *req_tsn;
11811         struct sctp_chunkhdr *ch;
11812
11813         ch = mtod(chk->data, struct sctp_chunkhdr *);
11814         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11815
11816         /* get to new offset for the param. */
11817         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11818         /* now how long will this param be? */
11819         len = sizeof(struct sctp_stream_reset_tsn_request);
11820         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11821         req_tsn->ph.param_length = htons(len);
11822         req_tsn->request_seq = htonl(seq);
11823
11824         /* now fix the chunk length */
11825         ch->chunk_length = htons(len + old_len);
11826         chk->send_size = len + old_len;
11827         chk->book_size = SCTP_SIZE32(chk->send_size);
11828         chk->book_size_scale = 0;
11829         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11830         return;
11831 }
11832
11833 void
11834 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11835     uint32_t resp_seq, uint32_t result)
11836 {
11837         uint16_t len, old_len;
11838         struct sctp_stream_reset_response *resp;
11839         struct sctp_chunkhdr *ch;
11840
11841         ch = mtod(chk->data, struct sctp_chunkhdr *);
11842         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11843
11844         /* get to new offset for the param. */
11845         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11846         /* now how long will this param be? */
11847         len = sizeof(struct sctp_stream_reset_response);
11848         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11849         resp->ph.param_length = htons(len);
11850         resp->response_seq = htonl(resp_seq);
11851         resp->result = ntohl(result);
11852
11853         /* now fix the chunk length */
11854         ch->chunk_length = htons(len + old_len);
11855         chk->book_size = len + old_len;
11856         chk->book_size_scale = 0;
11857         chk->send_size = SCTP_SIZE32(chk->book_size);
11858         SCTP_BUF_LEN(chk->data) = chk->send_size;
11859         return;
11860 }
11861
11862 void
11863 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11864     struct sctp_stream_reset_list *ent,
11865     int response)
11866 {
11867         struct sctp_association *asoc;
11868         struct sctp_tmit_chunk *chk;
11869         struct sctp_chunkhdr *ch;
11870
11871         asoc = &stcb->asoc;
11872
11873         /*
11874          * Reset our last reset action to the new one IP -> response
11875          * (PERFORMED probably). This assures that if we fail to send, a
11876          * retran from the peer will get the new response.
11877          */
11878         asoc->last_reset_action[0] = response;
11879         if (asoc->stream_reset_outstanding) {
11880                 return;
11881         }
11882         sctp_alloc_a_chunk(stcb, chk);
11883         if (chk == NULL) {
11884                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11885                 return;
11886         }
11887         chk->copy_by_ref = 0;
11888         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11889         chk->rec.chunk_id.can_take_data = 0;
11890         chk->flags = 0;
11891         chk->asoc = &stcb->asoc;
11892         chk->book_size = sizeof(struct sctp_chunkhdr);
11893         chk->send_size = SCTP_SIZE32(chk->book_size);
11894         chk->book_size_scale = 0;
11895         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11896         if (chk->data == NULL) {
11897                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11898                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11899                 return;
11900         }
11901         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11902         /* setup chunk parameters */
11903         chk->sent = SCTP_DATAGRAM_UNSENT;
11904         chk->snd_count = 0;
11905         if (stcb->asoc.alternate) {
11906                 chk->whoTo = stcb->asoc.alternate;
11907         } else {
11908                 chk->whoTo = stcb->asoc.primary_destination;
11909         }
11910         ch = mtod(chk->data, struct sctp_chunkhdr *);
11911         ch->chunk_type = SCTP_STREAM_RESET;
11912         ch->chunk_flags = 0;
11913         ch->chunk_length = htons(chk->book_size);
11914         atomic_add_int(&chk->whoTo->ref_count, 1);
11915         SCTP_BUF_LEN(chk->data) = chk->send_size;
11916         sctp_add_stream_reset_result(chk, ent->seq, response);
11917         /* insert the chunk for sending */
11918         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11919             chk,
11920             sctp_next);
11921         asoc->ctrl_queue_cnt++;
11922 }
11923
11924 void
11925 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11926     uint32_t resp_seq, uint32_t result,
11927     uint32_t send_una, uint32_t recv_next)
11928 {
11929         uint16_t len, old_len;
11930         struct sctp_stream_reset_response_tsn *resp;
11931         struct sctp_chunkhdr *ch;
11932
11933         ch = mtod(chk->data, struct sctp_chunkhdr *);
11934         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11935
11936         /* get to new offset for the param. */
11937         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11938         /* now how long will this param be? */
11939         len = sizeof(struct sctp_stream_reset_response_tsn);
11940         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11941         resp->ph.param_length = htons(len);
11942         resp->response_seq = htonl(resp_seq);
11943         resp->result = htonl(result);
11944         resp->senders_next_tsn = htonl(send_una);
11945         resp->receivers_next_tsn = htonl(recv_next);
11946
11947         /* now fix the chunk length */
11948         ch->chunk_length = htons(len + old_len);
11949         chk->book_size = len + old_len;
11950         chk->send_size = SCTP_SIZE32(chk->book_size);
11951         chk->book_size_scale = 0;
11952         SCTP_BUF_LEN(chk->data) = chk->send_size;
11953         return;
11954 }
11955
11956 static void
11957 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11958     uint32_t seq,
11959     uint16_t adding)
11960 {
11961         uint16_t len, old_len;
11962         struct sctp_chunkhdr *ch;
11963         struct sctp_stream_reset_add_strm *addstr;
11964
11965         ch = mtod(chk->data, struct sctp_chunkhdr *);
11966         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11967
11968         /* get to new offset for the param. */
11969         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11970         /* now how long will this param be? */
11971         len = sizeof(struct sctp_stream_reset_add_strm);
11972
11973         /* Fill it out. */
11974         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11975         addstr->ph.param_length = htons(len);
11976         addstr->request_seq = htonl(seq);
11977         addstr->number_of_streams = htons(adding);
11978         addstr->reserved = 0;
11979
11980         /* now fix the chunk length */
11981         ch->chunk_length = htons(len + old_len);
11982         chk->send_size = len + old_len;
11983         chk->book_size = SCTP_SIZE32(chk->send_size);
11984         chk->book_size_scale = 0;
11985         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11986         return;
11987 }
11988
11989 static void
11990 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11991     uint32_t seq,
11992     uint16_t adding)
11993 {
11994         uint16_t len, old_len;
11995         struct sctp_chunkhdr *ch;
11996         struct sctp_stream_reset_add_strm *addstr;
11997
11998         ch = mtod(chk->data, struct sctp_chunkhdr *);
11999         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12000
12001         /* get to new offset for the param. */
12002         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12003         /* now how long will this param be? */
12004         len = sizeof(struct sctp_stream_reset_add_strm);
12005         /* Fill it out. */
12006         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12007         addstr->ph.param_length = htons(len);
12008         addstr->request_seq = htonl(seq);
12009         addstr->number_of_streams = htons(adding);
12010         addstr->reserved = 0;
12011
12012         /* now fix the chunk length */
12013         ch->chunk_length = htons(len + old_len);
12014         chk->send_size = len + old_len;
12015         chk->book_size = SCTP_SIZE32(chk->send_size);
12016         chk->book_size_scale = 0;
12017         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12018         return;
12019 }
12020
12021 int
12022 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12023 {
12024         struct sctp_association *asoc;
12025         struct sctp_tmit_chunk *chk;
12026         struct sctp_chunkhdr *ch;
12027         uint32_t seq;
12028
12029         asoc = &stcb->asoc;
12030         asoc->trigger_reset = 0;
12031         if (asoc->stream_reset_outstanding) {
12032                 return (EALREADY);
12033         }
12034         sctp_alloc_a_chunk(stcb, chk);
12035         if (chk == NULL) {
12036                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12037                 return (ENOMEM);
12038         }
12039         chk->copy_by_ref = 0;
12040         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12041         chk->rec.chunk_id.can_take_data = 0;
12042         chk->flags = 0;
12043         chk->asoc = &stcb->asoc;
12044         chk->book_size = sizeof(struct sctp_chunkhdr);
12045         chk->send_size = SCTP_SIZE32(chk->book_size);
12046         chk->book_size_scale = 0;
12047         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12048         if (chk->data == NULL) {
12049                 sctp_free_a_chunk(stcb, chk, so_locked);
12050                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12051                 return (ENOMEM);
12052         }
12053         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12054
12055         /* setup chunk parameters */
12056         chk->sent = SCTP_DATAGRAM_UNSENT;
12057         chk->snd_count = 0;
12058         if (stcb->asoc.alternate) {
12059                 chk->whoTo = stcb->asoc.alternate;
12060         } else {
12061                 chk->whoTo = stcb->asoc.primary_destination;
12062         }
12063         ch = mtod(chk->data, struct sctp_chunkhdr *);
12064         ch->chunk_type = SCTP_STREAM_RESET;
12065         ch->chunk_flags = 0;
12066         ch->chunk_length = htons(chk->book_size);
12067         atomic_add_int(&chk->whoTo->ref_count, 1);
12068         SCTP_BUF_LEN(chk->data) = chk->send_size;
12069         seq = stcb->asoc.str_reset_seq_out;
12070         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12071                 seq++;
12072                 asoc->stream_reset_outstanding++;
12073         } else {
12074                 m_freem(chk->data);
12075                 chk->data = NULL;
12076                 sctp_free_a_chunk(stcb, chk, so_locked);
12077                 return (ENOENT);
12078         }
12079         asoc->str_reset = chk;
12080         /* insert the chunk for sending */
12081         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12082             chk,
12083             sctp_next);
12084         asoc->ctrl_queue_cnt++;
12085
12086         if (stcb->asoc.send_sack) {
12087                 sctp_send_sack(stcb, so_locked);
12088         }
12089         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12090         return (0);
12091 }
12092
12093 int
12094 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12095     uint16_t number_entries, uint16_t *list,
12096     uint8_t send_in_req,
12097     uint8_t send_tsn_req,
12098     uint8_t add_stream,
12099     uint16_t adding_o,
12100     uint16_t adding_i, uint8_t peer_asked)
12101 {
12102         struct sctp_association *asoc;
12103         struct sctp_tmit_chunk *chk;
12104         struct sctp_chunkhdr *ch;
12105         int can_send_out_req = 0;
12106         uint32_t seq;
12107
12108         asoc = &stcb->asoc;
12109         if (asoc->stream_reset_outstanding) {
12110                 /*-
12111                  * Already one pending, must get ACK back to clear the flag.
12112                  */
12113                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12114                 return (EBUSY);
12115         }
12116         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12117             (add_stream == 0)) {
12118                 /* nothing to do */
12119                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12120                 return (EINVAL);
12121         }
12122         if (send_tsn_req && send_in_req) {
12123                 /* error, can't do that */
12124                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12125                 return (EINVAL);
12126         } else if (send_in_req) {
12127                 can_send_out_req = 1;
12128         }
12129         if (number_entries > (MCLBYTES -
12130             SCTP_MIN_OVERHEAD -
12131             sizeof(struct sctp_chunkhdr) -
12132             sizeof(struct sctp_stream_reset_out_request)) /
12133             sizeof(uint16_t)) {
12134                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12135                 return (ENOMEM);
12136         }
12137         sctp_alloc_a_chunk(stcb, chk);
12138         if (chk == NULL) {
12139                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12140                 return (ENOMEM);
12141         }
12142         chk->copy_by_ref = 0;
12143         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12144         chk->rec.chunk_id.can_take_data = 0;
12145         chk->flags = 0;
12146         chk->asoc = &stcb->asoc;
12147         chk->book_size = sizeof(struct sctp_chunkhdr);
12148         chk->send_size = SCTP_SIZE32(chk->book_size);
12149         chk->book_size_scale = 0;
12150         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12151         if (chk->data == NULL) {
12152                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12153                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12154                 return (ENOMEM);
12155         }
12156         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12157
12158         /* setup chunk parameters */
12159         chk->sent = SCTP_DATAGRAM_UNSENT;
12160         chk->snd_count = 0;
12161         if (stcb->asoc.alternate) {
12162                 chk->whoTo = stcb->asoc.alternate;
12163         } else {
12164                 chk->whoTo = stcb->asoc.primary_destination;
12165         }
12166         atomic_add_int(&chk->whoTo->ref_count, 1);
12167         ch = mtod(chk->data, struct sctp_chunkhdr *);
12168         ch->chunk_type = SCTP_STREAM_RESET;
12169         ch->chunk_flags = 0;
12170         ch->chunk_length = htons(chk->book_size);
12171         SCTP_BUF_LEN(chk->data) = chk->send_size;
12172
12173         seq = stcb->asoc.str_reset_seq_out;
12174         if (can_send_out_req) {
12175                 int ret;
12176
12177                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12178                 if (ret) {
12179                         seq++;
12180                         asoc->stream_reset_outstanding++;
12181                 }
12182         }
12183         if ((add_stream & 1) &&
12184             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12185                 /* Need to allocate more */
12186                 struct sctp_stream_out *oldstream;
12187                 struct sctp_stream_queue_pending *sp, *nsp;
12188                 int i;
12189 #if defined(SCTP_DETAILED_STR_STATS)
12190                 int j;
12191 #endif
12192
12193                 oldstream = stcb->asoc.strmout;
12194                 /* get some more */
12195                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12196                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12197                     SCTP_M_STRMO);
12198                 if (stcb->asoc.strmout == NULL) {
12199                         uint8_t x;
12200
12201                         stcb->asoc.strmout = oldstream;
12202                         /* Turn off the bit */
12203                         x = add_stream & 0xfe;
12204                         add_stream = x;
12205                         goto skip_stuff;
12206                 }
12207                 /*
12208                  * Ok now we proceed with copying the old out stuff and
12209                  * initializing the new stuff.
12210                  */
12211                 SCTP_TCB_SEND_LOCK(stcb);
12212                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12213                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12214                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12215                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12216                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12217                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12218                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12219                         stcb->asoc.strmout[i].sid = i;
12220                         stcb->asoc.strmout[i].state = oldstream[i].state;
12221                         /* FIX ME FIX ME */
12222                         /*
12223                          * This should be a SS_COPY operation FIX ME STREAM
12224                          * SCHEDULER EXPERT
12225                          */
12226                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12227                         /* now anything on those queues? */
12228                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12229                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12230                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12231                         }
12232
12233                 }
12234                 /* now the new streams */
12235                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12236                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12237                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12238                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12239 #if defined(SCTP_DETAILED_STR_STATS)
12240                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12241                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12242                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12243                         }
12244 #else
12245                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12246                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12247 #endif
12248                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12249                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12250                         stcb->asoc.strmout[i].sid = i;
12251                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12252                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12253                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12254                 }
12255                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12256                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12257                 SCTP_TCB_SEND_UNLOCK(stcb);
12258         }
12259 skip_stuff:
12260         if ((add_stream & 1) && (adding_o > 0)) {
12261                 asoc->strm_pending_add_size = adding_o;
12262                 asoc->peer_req_out = peer_asked;
12263                 sctp_add_an_out_stream(chk, seq, adding_o);
12264                 seq++;
12265                 asoc->stream_reset_outstanding++;
12266         }
12267         if ((add_stream & 2) && (adding_i > 0)) {
12268                 sctp_add_an_in_stream(chk, seq, adding_i);
12269                 seq++;
12270                 asoc->stream_reset_outstanding++;
12271         }
12272         if (send_in_req) {
12273                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12274                 seq++;
12275                 asoc->stream_reset_outstanding++;
12276         }
12277         if (send_tsn_req) {
12278                 sctp_add_stream_reset_tsn(chk, seq);
12279                 asoc->stream_reset_outstanding++;
12280         }
12281         asoc->str_reset = chk;
12282         /* insert the chunk for sending */
12283         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12284             chk,
12285             sctp_next);
12286         asoc->ctrl_queue_cnt++;
12287         if (stcb->asoc.send_sack) {
12288                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12289         }
12290         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12291         return (0);
12292 }
12293
12294 void
12295 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12296     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12297     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12298     uint32_t vrf_id, uint16_t port)
12299 {
12300         /* Don't respond to an ABORT with an ABORT. */
12301         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12302                 if (cause)
12303                         sctp_m_freem(cause);
12304                 return;
12305         }
12306         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12307             mflowtype, mflowid, fibnum,
12308             vrf_id, port);
12309         return;
12310 }
12311
12312 void
12313 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12314     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12315     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12316     uint32_t vrf_id, uint16_t port)
12317 {
12318         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12319             mflowtype, mflowid, fibnum,
12320             vrf_id, port);
12321         return;
12322 }
12323
12324 static struct mbuf *
12325 sctp_copy_resume(struct uio *uio,
12326     int max_send_len,
12327     int user_marks_eor,
12328     int *error,
12329     uint32_t *sndout,
12330     struct mbuf **new_tail)
12331 {
12332         struct mbuf *m;
12333
12334         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12335             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12336         if (m == NULL) {
12337                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12338                 *error = ENOBUFS;
12339         } else {
12340                 *sndout = m_length(m, NULL);
12341                 *new_tail = m_last(m);
12342         }
12343         return (m);
12344 }
12345
12346 static int
12347 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12348     struct uio *uio,
12349     int resv_upfront)
12350 {
12351         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12352             resv_upfront, 0);
12353         if (sp->data == NULL) {
12354                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12355                 return (ENOBUFS);
12356         }
12357
12358         sp->tail_mbuf = m_last(sp->data);
12359         return (0);
12360 }
12361
12362
12363
12364 static struct sctp_stream_queue_pending *
12365 sctp_copy_it_in(struct sctp_tcb *stcb,
12366     struct sctp_association *asoc,
12367     struct sctp_sndrcvinfo *srcv,
12368     struct uio *uio,
12369     struct sctp_nets *net,
12370     ssize_t max_send_len,
12371     int user_marks_eor,
12372     int *error)
12373 {
12374
12375         /*-
12376          * This routine must be very careful in its work. Protocol
12377          * processing is up and running so care must be taken to spl...()
12378          * when you need to do something that may effect the stcb/asoc. The
12379          * sb is locked however. When data is copied the protocol processing
12380          * should be enabled since this is a slower operation...
12381          */
12382         struct sctp_stream_queue_pending *sp = NULL;
12383         int resv_in_first;
12384
12385         *error = 0;
12386         /* Now can we send this? */
12387         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12388             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12389             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12390             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12391                 /* got data while shutting down */
12392                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12393                 *error = ECONNRESET;
12394                 goto out_now;
12395         }
12396         sctp_alloc_a_strmoq(stcb, sp);
12397         if (sp == NULL) {
12398                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12399                 *error = ENOMEM;
12400                 goto out_now;
12401         }
12402         sp->act_flags = 0;
12403         sp->sender_all_done = 0;
12404         sp->sinfo_flags = srcv->sinfo_flags;
12405         sp->timetolive = srcv->sinfo_timetolive;
12406         sp->ppid = srcv->sinfo_ppid;
12407         sp->context = srcv->sinfo_context;
12408         sp->fsn = 0;
12409         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12410
12411         sp->sid = srcv->sinfo_stream;
12412         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12413         if ((sp->length == (uint32_t)uio->uio_resid) &&
12414             ((user_marks_eor == 0) ||
12415             (srcv->sinfo_flags & SCTP_EOF) ||
12416             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12417                 sp->msg_is_complete = 1;
12418         } else {
12419                 sp->msg_is_complete = 0;
12420         }
12421         sp->sender_all_done = 0;
12422         sp->some_taken = 0;
12423         sp->put_last_out = 0;
12424         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12425         sp->data = sp->tail_mbuf = NULL;
12426         if (sp->length == 0) {
12427                 goto skip_copy;
12428         }
12429         if (srcv->sinfo_keynumber_valid) {
12430                 sp->auth_keyid = srcv->sinfo_keynumber;
12431         } else {
12432                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12433         }
12434         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12435                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12436                 sp->holds_key_ref = 1;
12437         }
12438         *error = sctp_copy_one(sp, uio, resv_in_first);
12439 skip_copy:
12440         if (*error) {
12441                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12442                 sp = NULL;
12443         } else {
12444                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12445                         sp->net = net;
12446                         atomic_add_int(&sp->net->ref_count, 1);
12447                 } else {
12448                         sp->net = NULL;
12449                 }
12450                 sctp_set_prsctp_policy(sp);
12451         }
12452 out_now:
12453         return (sp);
12454 }
12455
12456
12457 int
12458 sctp_sosend(struct socket *so,
12459     struct sockaddr *addr,
12460     struct uio *uio,
12461     struct mbuf *top,
12462     struct mbuf *control,
12463     int flags,
12464     struct thread *p
12465 )
12466 {
12467         int error, use_sndinfo = 0;
12468         struct sctp_sndrcvinfo sndrcvninfo;
12469         struct sockaddr *addr_to_use;
12470 #if defined(INET) && defined(INET6)
12471         struct sockaddr_in sin;
12472 #endif
12473
12474         if (control) {
12475                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12476                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12477                     sizeof(sndrcvninfo))) {
12478                         /* got one */
12479                         use_sndinfo = 1;
12480                 }
12481         }
12482         addr_to_use = addr;
12483 #if defined(INET) && defined(INET6)
12484         if ((addr) && (addr->sa_family == AF_INET6)) {
12485                 struct sockaddr_in6 *sin6;
12486
12487                 sin6 = (struct sockaddr_in6 *)addr;
12488                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12489                         in6_sin6_2_sin(&sin, sin6);
12490                         addr_to_use = (struct sockaddr *)&sin;
12491                 }
12492         }
12493 #endif
12494         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12495             control,
12496             flags,
12497             use_sndinfo ? &sndrcvninfo : NULL
12498             ,p
12499             );
12500         return (error);
12501 }
12502
12503
12504 int
12505 sctp_lower_sosend(struct socket *so,
12506     struct sockaddr *addr,
12507     struct uio *uio,
12508     struct mbuf *i_pak,
12509     struct mbuf *control,
12510     int flags,
12511     struct sctp_sndrcvinfo *srcv
12512     ,
12513     struct thread *p
12514 )
12515 {
12516         ssize_t sndlen = 0, max_len;
12517         int error, len;
12518         struct mbuf *top = NULL;
12519         int queue_only = 0, queue_only_for_init = 0;
12520         int free_cnt_applied = 0;
12521         int un_sent;
12522         int now_filled = 0;
12523         unsigned int inqueue_bytes = 0;
12524         struct sctp_block_entry be;
12525         struct sctp_inpcb *inp;
12526         struct sctp_tcb *stcb = NULL;
12527         struct timeval now;
12528         struct sctp_nets *net;
12529         struct sctp_association *asoc;
12530         struct sctp_inpcb *t_inp;
12531         int user_marks_eor;
12532         int create_lock_applied = 0;
12533         int nagle_applies = 0;
12534         int some_on_control = 0;
12535         int got_all_of_the_send = 0;
12536         int hold_tcblock = 0;
12537         int non_blocking = 0;
12538         uint32_t local_add_more;
12539         ssize_t local_soresv = 0;
12540         uint16_t port;
12541         uint16_t sinfo_flags;
12542         sctp_assoc_t sinfo_assoc_id;
12543
12544         error = 0;
12545         net = NULL;
12546         stcb = NULL;
12547         asoc = NULL;
12548
12549         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12550         if (inp == NULL) {
12551                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12552                 error = EINVAL;
12553                 if (i_pak) {
12554                         SCTP_RELEASE_PKT(i_pak);
12555                 }
12556                 return (error);
12557         }
12558         if ((uio == NULL) && (i_pak == NULL)) {
12559                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12560                 return (EINVAL);
12561         }
12562         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12563         atomic_add_int(&inp->total_sends, 1);
12564         if (uio) {
12565                 if (uio->uio_resid < 0) {
12566                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12567                         return (EINVAL);
12568                 }
12569                 sndlen = uio->uio_resid;
12570         } else {
12571                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12572                 sndlen = SCTP_HEADER_LEN(i_pak);
12573         }
12574         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zu\n",
12575             (void *)addr,
12576             sndlen);
12577         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12578             SCTP_IS_LISTENING(inp)) {
12579                 /* The listener can NOT send */
12580                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12581                 error = ENOTCONN;
12582                 goto out_unlocked;
12583         }
12584         /**
12585          * Pre-screen address, if one is given the sin-len
12586          * must be set correctly!
12587          */
12588         if (addr) {
12589                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12590
12591                 switch (raddr->sa.sa_family) {
12592 #ifdef INET
12593                 case AF_INET:
12594                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12595                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                                 error = EINVAL;
12597                                 goto out_unlocked;
12598                         }
12599                         port = raddr->sin.sin_port;
12600                         break;
12601 #endif
12602 #ifdef INET6
12603                 case AF_INET6:
12604                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12605                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                                 error = EINVAL;
12607                                 goto out_unlocked;
12608                         }
12609                         port = raddr->sin6.sin6_port;
12610                         break;
12611 #endif
12612                 default:
12613                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12614                         error = EAFNOSUPPORT;
12615                         goto out_unlocked;
12616                 }
12617         } else
12618                 port = 0;
12619
12620         if (srcv) {
12621                 sinfo_flags = srcv->sinfo_flags;
12622                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12623                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12624                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12625                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12626                         error = EINVAL;
12627                         goto out_unlocked;
12628                 }
12629                 if (srcv->sinfo_flags)
12630                         SCTP_STAT_INCR(sctps_sends_with_flags);
12631         } else {
12632                 sinfo_flags = inp->def_send.sinfo_flags;
12633                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12634         }
12635         if (flags & MSG_EOR) {
12636                 sinfo_flags |= SCTP_EOR;
12637         }
12638         if (flags & MSG_EOF) {
12639                 sinfo_flags |= SCTP_EOF;
12640         }
12641         if (sinfo_flags & SCTP_SENDALL) {
12642                 /* its a sendall */
12643                 error = sctp_sendall(inp, uio, top, srcv);
12644                 top = NULL;
12645                 goto out_unlocked;
12646         }
12647         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12648                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12649                 error = EINVAL;
12650                 goto out_unlocked;
12651         }
12652         /* now we must find the assoc */
12653         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12654             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12655                 SCTP_INP_RLOCK(inp);
12656                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12657                 if (stcb) {
12658                         SCTP_TCB_LOCK(stcb);
12659                         hold_tcblock = 1;
12660                 }
12661                 SCTP_INP_RUNLOCK(inp);
12662         } else if (sinfo_assoc_id) {
12663                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12664                 if (stcb != NULL) {
12665                         hold_tcblock = 1;
12666                 }
12667         } else if (addr) {
12668                 /*-
12669                  * Since we did not use findep we must
12670                  * increment it, and if we don't find a tcb
12671                  * decrement it.
12672                  */
12673                 SCTP_INP_WLOCK(inp);
12674                 SCTP_INP_INCR_REF(inp);
12675                 SCTP_INP_WUNLOCK(inp);
12676                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12677                 if (stcb == NULL) {
12678                         SCTP_INP_WLOCK(inp);
12679                         SCTP_INP_DECR_REF(inp);
12680                         SCTP_INP_WUNLOCK(inp);
12681                 } else {
12682                         hold_tcblock = 1;
12683                 }
12684         }
12685         if ((stcb == NULL) && (addr)) {
12686                 /* Possible implicit send? */
12687                 SCTP_ASOC_CREATE_LOCK(inp);
12688                 create_lock_applied = 1;
12689                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12690                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12691                         /* Should I really unlock ? */
12692                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12693                         error = EINVAL;
12694                         goto out_unlocked;
12695
12696                 }
12697                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12698                     (addr->sa_family == AF_INET6)) {
12699                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12700                         error = EINVAL;
12701                         goto out_unlocked;
12702                 }
12703                 SCTP_INP_WLOCK(inp);
12704                 SCTP_INP_INCR_REF(inp);
12705                 SCTP_INP_WUNLOCK(inp);
12706                 /* With the lock applied look again */
12707                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12708 #if defined(INET) || defined(INET6)
12709                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12710                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12711                 }
12712 #endif
12713                 if (stcb == NULL) {
12714                         SCTP_INP_WLOCK(inp);
12715                         SCTP_INP_DECR_REF(inp);
12716                         SCTP_INP_WUNLOCK(inp);
12717                 } else {
12718                         hold_tcblock = 1;
12719                 }
12720                 if (error) {
12721                         goto out_unlocked;
12722                 }
12723                 if (t_inp != inp) {
12724                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12725                         error = ENOTCONN;
12726                         goto out_unlocked;
12727                 }
12728         }
12729         if (stcb == NULL) {
12730                 if (addr == NULL) {
12731                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12732                         error = ENOENT;
12733                         goto out_unlocked;
12734                 } else {
12735                         /* We must go ahead and start the INIT process */
12736                         uint32_t vrf_id;
12737
12738                         if ((sinfo_flags & SCTP_ABORT) ||
12739                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12740                                 /*-
12741                                  * User asks to abort a non-existant assoc,
12742                                  * or EOF a non-existant assoc with no data
12743                                  */
12744                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12745                                 error = ENOENT;
12746                                 goto out_unlocked;
12747                         }
12748                         /* get an asoc/stcb struct */
12749                         vrf_id = inp->def_vrf_id;
12750 #ifdef INVARIANTS
12751                         if (create_lock_applied == 0) {
12752                                 panic("Error, should hold create lock and I don't?");
12753                         }
12754 #endif
12755                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12756                             inp->sctp_ep.pre_open_stream_count,
12757                             inp->sctp_ep.port,
12758                             p,
12759                             SCTP_INITIALIZE_AUTH_PARAMS);
12760                         if (stcb == NULL) {
12761                                 /* Error is setup for us in the call */
12762                                 goto out_unlocked;
12763                         }
12764                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12765                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12766                                 /*
12767                                  * Set the connected flag so we can queue
12768                                  * data
12769                                  */
12770                                 soisconnecting(so);
12771                         }
12772                         hold_tcblock = 1;
12773                         if (create_lock_applied) {
12774                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12775                                 create_lock_applied = 0;
12776                         } else {
12777                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12778                         }
12779                         /*
12780                          * Turn on queue only flag to prevent data from
12781                          * being sent
12782                          */
12783                         queue_only = 1;
12784                         asoc = &stcb->asoc;
12785                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12786                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12787
12788                         if (control) {
12789                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12790                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12791                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12792                                         hold_tcblock = 0;
12793                                         stcb = NULL;
12794                                         goto out_unlocked;
12795                                 }
12796                         }
12797                         /* out with the INIT */
12798                         queue_only_for_init = 1;
12799                         /*-
12800                          * we may want to dig in after this call and adjust the MTU
12801                          * value. It defaulted to 1500 (constant) but the ro
12802                          * structure may now have an update and thus we may need to
12803                          * change it BEFORE we append the message.
12804                          */
12805                 }
12806         } else
12807                 asoc = &stcb->asoc;
12808         if (srcv == NULL) {
12809                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12810                 sinfo_flags = srcv->sinfo_flags;
12811                 if (flags & MSG_EOR) {
12812                         sinfo_flags |= SCTP_EOR;
12813                 }
12814                 if (flags & MSG_EOF) {
12815                         sinfo_flags |= SCTP_EOF;
12816                 }
12817         }
12818         if (sinfo_flags & SCTP_ADDR_OVER) {
12819                 if (addr)
12820                         net = sctp_findnet(stcb, addr);
12821                 else
12822                         net = NULL;
12823                 if ((net == NULL) ||
12824                     ((port != 0) && (port != stcb->rport))) {
12825                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12826                         error = EINVAL;
12827                         goto out_unlocked;
12828                 }
12829         } else {
12830                 if (stcb->asoc.alternate) {
12831                         net = stcb->asoc.alternate;
12832                 } else {
12833                         net = stcb->asoc.primary_destination;
12834                 }
12835         }
12836         atomic_add_int(&stcb->total_sends, 1);
12837         /* Keep the stcb from being freed under our feet */
12838         atomic_add_int(&asoc->refcnt, 1);
12839         free_cnt_applied = 1;
12840
12841         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12842                 if (sndlen > asoc->smallest_mtu) {
12843                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12844                         error = EMSGSIZE;
12845                         goto out_unlocked;
12846                 }
12847         }
12848         if (SCTP_SO_IS_NBIO(so)
12849             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12850             ) {
12851                 non_blocking = 1;
12852         }
12853         /* would we block? */
12854         if (non_blocking) {
12855                 ssize_t amount;
12856
12857                 if (hold_tcblock == 0) {
12858                         SCTP_TCB_LOCK(stcb);
12859                         hold_tcblock = 1;
12860                 }
12861                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12862                 if (user_marks_eor == 0) {
12863                         amount = sndlen;
12864                 } else {
12865                         amount = 1;
12866                 }
12867                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12868                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12869                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12870                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12871                                 error = EMSGSIZE;
12872                         else
12873                                 error = EWOULDBLOCK;
12874                         goto out_unlocked;
12875                 }
12876                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12877                 SCTP_TCB_UNLOCK(stcb);
12878                 hold_tcblock = 0;
12879         } else {
12880                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12881         }
12882         local_soresv = sndlen;
12883         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12884                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12885                 error = ECONNRESET;
12886                 goto out_unlocked;
12887         }
12888         if (create_lock_applied) {
12889                 SCTP_ASOC_CREATE_UNLOCK(inp);
12890                 create_lock_applied = 0;
12891         }
12892         /* Is the stream no. valid? */
12893         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12894                 /* Invalid stream number */
12895                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12896                 error = EINVAL;
12897                 goto out_unlocked;
12898         }
12899         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12900             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12901                 /*
12902                  * Can't queue any data while stream reset is underway.
12903                  */
12904                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12905                         error = EAGAIN;
12906                 } else {
12907                         error = EINVAL;
12908                 }
12909                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12910                 goto out_unlocked;
12911         }
12912         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12913             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12914                 queue_only = 1;
12915         }
12916         /* we are now done with all control */
12917         if (control) {
12918                 sctp_m_freem(control);
12919                 control = NULL;
12920         }
12921         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12922             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12923             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12924             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12925                 if (sinfo_flags & SCTP_ABORT) {
12926                         ;
12927                 } else {
12928                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12929                         error = ECONNRESET;
12930                         goto out_unlocked;
12931                 }
12932         }
12933         /* Ok, we will attempt a msgsnd :> */
12934         if (p) {
12935                 p->td_ru.ru_msgsnd++;
12936         }
12937         /* Are we aborting? */
12938         if (sinfo_flags & SCTP_ABORT) {
12939                 struct mbuf *mm;
12940                 ssize_t tot_demand, tot_out = 0, max_out;
12941
12942                 SCTP_STAT_INCR(sctps_sends_with_abort);
12943                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12944                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12945                         /* It has to be up before we abort */
12946                         /* how big is the user initiated abort? */
12947                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12948                         error = EINVAL;
12949                         goto out;
12950                 }
12951                 if (hold_tcblock) {
12952                         SCTP_TCB_UNLOCK(stcb);
12953                         hold_tcblock = 0;
12954                 }
12955                 if (top) {
12956                         struct mbuf *cntm = NULL;
12957
12958                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12959                         if (sndlen != 0) {
12960                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12961                                         tot_out += SCTP_BUF_LEN(cntm);
12962                                 }
12963                         }
12964                 } else {
12965                         /* Must fit in a MTU */
12966                         tot_out = sndlen;
12967                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12968                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12969                                 /* To big */
12970                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12971                                 error = EMSGSIZE;
12972                                 goto out;
12973                         }
12974                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12975                 }
12976                 if (mm == NULL) {
12977                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12978                         error = ENOMEM;
12979                         goto out;
12980                 }
12981                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12982                 max_out -= sizeof(struct sctp_abort_msg);
12983                 if (tot_out > max_out) {
12984                         tot_out = max_out;
12985                 }
12986                 if (mm) {
12987                         struct sctp_paramhdr *ph;
12988
12989                         /* now move forward the data pointer */
12990                         ph = mtod(mm, struct sctp_paramhdr *);
12991                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12992                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12993                         ph++;
12994                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12995                         if (top == NULL) {
12996                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12997                                 if (error) {
12998                                         /*-
12999                                          * Here if we can't get his data we
13000                                          * still abort we just don't get to
13001                                          * send the users note :-0
13002                                          */
13003                                         sctp_m_freem(mm);
13004                                         mm = NULL;
13005                                 }
13006                         } else {
13007                                 if (sndlen != 0) {
13008                                         SCTP_BUF_NEXT(mm) = top;
13009                                 }
13010                         }
13011                 }
13012                 if (hold_tcblock == 0) {
13013                         SCTP_TCB_LOCK(stcb);
13014                 }
13015                 atomic_add_int(&stcb->asoc.refcnt, -1);
13016                 free_cnt_applied = 0;
13017                 /* release this lock, otherwise we hang on ourselves */
13018                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13019                 /* now relock the stcb so everything is sane */
13020                 hold_tcblock = 0;
13021                 stcb = NULL;
13022                 /*
13023                  * In this case top is already chained to mm avoid double
13024                  * free, since we free it below if top != NULL and driver
13025                  * would free it after sending the packet out
13026                  */
13027                 if (sndlen != 0) {
13028                         top = NULL;
13029                 }
13030                 goto out_unlocked;
13031         }
13032         /* Calculate the maximum we can send */
13033         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13034         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13035                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13036         } else {
13037                 max_len = 0;
13038         }
13039         if (hold_tcblock) {
13040                 SCTP_TCB_UNLOCK(stcb);
13041                 hold_tcblock = 0;
13042         }
13043         if (asoc->strmout == NULL) {
13044                 /* huh? software error */
13045                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13046                 error = EFAULT;
13047                 goto out_unlocked;
13048         }
13049
13050         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13051         if ((user_marks_eor == 0) &&
13052             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13053                 /* It will NEVER fit */
13054                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13055                 error = EMSGSIZE;
13056                 goto out_unlocked;
13057         }
13058         if ((uio == NULL) && user_marks_eor) {
13059                 /*-
13060                  * We do not support eeor mode for
13061                  * sending with mbuf chains (like sendfile).
13062                  */
13063                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13064                 error = EINVAL;
13065                 goto out_unlocked;
13066         }
13067
13068         if (user_marks_eor) {
13069                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13070         } else {
13071                 /*-
13072                  * For non-eeor the whole message must fit in
13073                  * the socket send buffer.
13074                  */
13075                 local_add_more = (uint32_t)sndlen;
13076         }
13077         len = 0;
13078         if (non_blocking) {
13079                 goto skip_preblock;
13080         }
13081         if (((max_len <= local_add_more) &&
13082             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13083             (max_len == 0) ||
13084             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13085                 /* No room right now ! */
13086                 SOCKBUF_LOCK(&so->so_snd);
13087                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13088                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13089                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13090                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13091                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13092                             inqueue_bytes,
13093                             local_add_more,
13094                             stcb->asoc.stream_queue_cnt,
13095                             stcb->asoc.chunks_on_out_queue,
13096                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13097                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13098                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13099                         }
13100                         be.error = 0;
13101                         stcb->block_entry = &be;
13102                         error = sbwait(&so->so_snd);
13103                         stcb->block_entry = NULL;
13104                         if (error || so->so_error || be.error) {
13105                                 if (error == 0) {
13106                                         if (so->so_error)
13107                                                 error = so->so_error;
13108                                         if (be.error) {
13109                                                 error = be.error;
13110                                         }
13111                                 }
13112                                 SOCKBUF_UNLOCK(&so->so_snd);
13113                                 goto out_unlocked;
13114                         }
13115                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13116                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13117                                     asoc, stcb->asoc.total_output_queue_size);
13118                         }
13119                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13120                                 SOCKBUF_UNLOCK(&so->so_snd);
13121                                 goto out_unlocked;
13122                         }
13123                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13124                 }
13125                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13126                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13127                 } else {
13128                         max_len = 0;
13129                 }
13130                 SOCKBUF_UNLOCK(&so->so_snd);
13131         }
13132
13133 skip_preblock:
13134         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13135                 goto out_unlocked;
13136         }
13137         /*
13138          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13139          * case NOTE: uio will be null when top/mbuf is passed
13140          */
13141         if (sndlen == 0) {
13142                 if (sinfo_flags & SCTP_EOF) {
13143                         got_all_of_the_send = 1;
13144                         goto dataless_eof;
13145                 } else {
13146                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13147                         error = EINVAL;
13148                         goto out;
13149                 }
13150         }
13151         if (top == NULL) {
13152                 struct sctp_stream_queue_pending *sp;
13153                 struct sctp_stream_out *strm;
13154                 uint32_t sndout;
13155
13156                 SCTP_TCB_SEND_LOCK(stcb);
13157                 if ((asoc->stream_locked) &&
13158                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13159                         SCTP_TCB_SEND_UNLOCK(stcb);
13160                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13161                         error = EINVAL;
13162                         goto out;
13163                 }
13164                 SCTP_TCB_SEND_UNLOCK(stcb);
13165
13166                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13167                 if (strm->last_msg_incomplete == 0) {
13168         do_a_copy_in:
13169                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13170                         if (error) {
13171                                 goto out;
13172                         }
13173                         SCTP_TCB_SEND_LOCK(stcb);
13174                         if (sp->msg_is_complete) {
13175                                 strm->last_msg_incomplete = 0;
13176                                 asoc->stream_locked = 0;
13177                         } else {
13178                                 /*
13179                                  * Just got locked to this guy in case of an
13180                                  * interrupt.
13181                                  */
13182                                 strm->last_msg_incomplete = 1;
13183                                 if (stcb->asoc.idata_supported == 0) {
13184                                         asoc->stream_locked = 1;
13185                                         asoc->stream_locked_on = srcv->sinfo_stream;
13186                                 }
13187                                 sp->sender_all_done = 0;
13188                         }
13189                         sctp_snd_sb_alloc(stcb, sp->length);
13190                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13191                         if (sinfo_flags & SCTP_UNORDERED) {
13192                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13193                         }
13194                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13195                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13196                         SCTP_TCB_SEND_UNLOCK(stcb);
13197                 } else {
13198                         SCTP_TCB_SEND_LOCK(stcb);
13199                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13200                         SCTP_TCB_SEND_UNLOCK(stcb);
13201                         if (sp == NULL) {
13202                                 /* ???? Huh ??? last msg is gone */
13203 #ifdef INVARIANTS
13204                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13205 #else
13206                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13207                                 strm->last_msg_incomplete = 0;
13208 #endif
13209                                 goto do_a_copy_in;
13210
13211                         }
13212                 }
13213                 while (uio->uio_resid > 0) {
13214                         /* How much room do we have? */
13215                         struct mbuf *new_tail, *mm;
13216
13217                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13218                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13219                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13220                         else
13221                                 max_len = 0;
13222
13223                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13224                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13225                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13226                                 sndout = 0;
13227                                 new_tail = NULL;
13228                                 if (hold_tcblock) {
13229                                         SCTP_TCB_UNLOCK(stcb);
13230                                         hold_tcblock = 0;
13231                                 }
13232                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13233                                 if ((mm == NULL) || error) {
13234                                         if (mm) {
13235                                                 sctp_m_freem(mm);
13236                                         }
13237                                         goto out;
13238                                 }
13239                                 /* Update the mbuf and count */
13240                                 SCTP_TCB_SEND_LOCK(stcb);
13241                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13242                                         /*
13243                                          * we need to get out. Peer probably
13244                                          * aborted.
13245                                          */
13246                                         sctp_m_freem(mm);
13247                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13248                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13249                                                 error = ECONNRESET;
13250                                         }
13251                                         SCTP_TCB_SEND_UNLOCK(stcb);
13252                                         goto out;
13253                                 }
13254                                 if (sp->tail_mbuf) {
13255                                         /* tack it to the end */
13256                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13257                                         sp->tail_mbuf = new_tail;
13258                                 } else {
13259                                         /* A stolen mbuf */
13260                                         sp->data = mm;
13261                                         sp->tail_mbuf = new_tail;
13262                                 }
13263                                 sctp_snd_sb_alloc(stcb, sndout);
13264                                 atomic_add_int(&sp->length, sndout);
13265                                 len += sndout;
13266                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13267                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13268                                 }
13269
13270                                 /* Did we reach EOR? */
13271                                 if ((uio->uio_resid == 0) &&
13272                                     ((user_marks_eor == 0) ||
13273                                     (sinfo_flags & SCTP_EOF) ||
13274                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13275                                         sp->msg_is_complete = 1;
13276                                 } else {
13277                                         sp->msg_is_complete = 0;
13278                                 }
13279                                 SCTP_TCB_SEND_UNLOCK(stcb);
13280                         }
13281                         if (uio->uio_resid == 0) {
13282                                 /* got it all? */
13283                                 continue;
13284                         }
13285                         /* PR-SCTP? */
13286                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13287                                 /*
13288                                  * This is ugly but we must assure locking
13289                                  * order
13290                                  */
13291                                 if (hold_tcblock == 0) {
13292                                         SCTP_TCB_LOCK(stcb);
13293                                         hold_tcblock = 1;
13294                                 }
13295                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13296                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13297                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13298                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13299                                 else
13300                                         max_len = 0;
13301                                 if (max_len > 0) {
13302                                         continue;
13303                                 }
13304                                 SCTP_TCB_UNLOCK(stcb);
13305                                 hold_tcblock = 0;
13306                         }
13307                         /* wait for space now */
13308                         if (non_blocking) {
13309                                 /* Non-blocking io in place out */
13310                                 goto skip_out_eof;
13311                         }
13312                         /* What about the INIT, send it maybe */
13313                         if (queue_only_for_init) {
13314                                 if (hold_tcblock == 0) {
13315                                         SCTP_TCB_LOCK(stcb);
13316                                         hold_tcblock = 1;
13317                                 }
13318                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13319                                         /* a collision took us forward? */
13320                                         queue_only = 0;
13321                                 } else {
13322                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13323                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13324                                         queue_only = 1;
13325                                 }
13326                         }
13327                         if ((net->flight_size > net->cwnd) &&
13328                             (asoc->sctp_cmt_on_off == 0)) {
13329                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13330                                 queue_only = 1;
13331                         } else if (asoc->ifp_had_enobuf) {
13332                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13333                                 if (net->flight_size > (2 * net->mtu)) {
13334                                         queue_only = 1;
13335                                 }
13336                                 asoc->ifp_had_enobuf = 0;
13337                         }
13338                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13339                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13340                             (stcb->asoc.total_flight > 0) &&
13341                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13342                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13343
13344                                 /*-
13345                                  * Ok, Nagle is set on and we have data outstanding.
13346                                  * Don't send anything and let SACKs drive out the
13347                                  * data unless we have a "full" segment to send.
13348                                  */
13349                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13350                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13351                                 }
13352                                 SCTP_STAT_INCR(sctps_naglequeued);
13353                                 nagle_applies = 1;
13354                         } else {
13355                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13356                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13357                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13358                                 }
13359                                 SCTP_STAT_INCR(sctps_naglesent);
13360                                 nagle_applies = 0;
13361                         }
13362                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13363
13364                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13365                                     nagle_applies, un_sent);
13366                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13367                                     stcb->asoc.total_flight,
13368                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13369                         }
13370                         if (queue_only_for_init)
13371                                 queue_only_for_init = 0;
13372                         if ((queue_only == 0) && (nagle_applies == 0)) {
13373                                 /*-
13374                                  * need to start chunk output
13375                                  * before blocking.. note that if
13376                                  * a lock is already applied, then
13377                                  * the input via the net is happening
13378                                  * and I don't need to start output :-D
13379                                  */
13380                                 if (hold_tcblock == 0) {
13381                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13382                                                 hold_tcblock = 1;
13383                                                 sctp_chunk_output(inp,
13384                                                     stcb,
13385                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13386                                         }
13387                                 } else {
13388                                         sctp_chunk_output(inp,
13389                                             stcb,
13390                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13391                                 }
13392                         }
13393                         if (hold_tcblock == 1) {
13394                                 SCTP_TCB_UNLOCK(stcb);
13395                                 hold_tcblock = 0;
13396                         }
13397                         SOCKBUF_LOCK(&so->so_snd);
13398                         /*-
13399                          * This is a bit strange, but I think it will
13400                          * work. The total_output_queue_size is locked and
13401                          * protected by the TCB_LOCK, which we just released.
13402                          * There is a race that can occur between releasing it
13403                          * above, and me getting the socket lock, where sacks
13404                          * come in but we have not put the SB_WAIT on the
13405                          * so_snd buffer to get the wakeup. After the LOCK
13406                          * is applied the sack_processing will also need to
13407                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13408                          * once we have the socket buffer lock if we recheck the
13409                          * size we KNOW we will get to sleep safely with the
13410                          * wakeup flag in place.
13411                          */
13412                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13413                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13414                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13415                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13416                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13417                                             asoc, uio->uio_resid);
13418                                 }
13419                                 be.error = 0;
13420                                 stcb->block_entry = &be;
13421                                 error = sbwait(&so->so_snd);
13422                                 stcb->block_entry = NULL;
13423
13424                                 if (error || so->so_error || be.error) {
13425                                         if (error == 0) {
13426                                                 if (so->so_error)
13427                                                         error = so->so_error;
13428                                                 if (be.error) {
13429                                                         error = be.error;
13430                                                 }
13431                                         }
13432                                         SOCKBUF_UNLOCK(&so->so_snd);
13433                                         goto out_unlocked;
13434                                 }
13435
13436                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13437                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13438                                             asoc, stcb->asoc.total_output_queue_size);
13439                                 }
13440                         }
13441                         SOCKBUF_UNLOCK(&so->so_snd);
13442                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13443                                 goto out_unlocked;
13444                         }
13445                 }
13446                 SCTP_TCB_SEND_LOCK(stcb);
13447                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13448                         SCTP_TCB_SEND_UNLOCK(stcb);
13449                         goto out_unlocked;
13450                 }
13451                 if (sp) {
13452                         if (sp->msg_is_complete == 0) {
13453                                 strm->last_msg_incomplete = 1;
13454                                 if (stcb->asoc.idata_supported == 0) {
13455                                         asoc->stream_locked = 1;
13456                                         asoc->stream_locked_on = srcv->sinfo_stream;
13457                                 }
13458                         } else {
13459                                 sp->sender_all_done = 1;
13460                                 strm->last_msg_incomplete = 0;
13461                                 asoc->stream_locked = 0;
13462                         }
13463                 } else {
13464                         SCTP_PRINTF("Huh no sp TSNH?\n");
13465                         strm->last_msg_incomplete = 0;
13466                         asoc->stream_locked = 0;
13467                 }
13468                 SCTP_TCB_SEND_UNLOCK(stcb);
13469                 if (uio->uio_resid == 0) {
13470                         got_all_of_the_send = 1;
13471                 }
13472         } else {
13473                 /* We send in a 0, since we do NOT have any locks */
13474                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13475                 top = NULL;
13476                 if (sinfo_flags & SCTP_EOF) {
13477                         /*
13478                          * This should only happen for Panda for the mbuf
13479                          * send case, which does NOT yet support EEOR mode.
13480                          * Thus, we can just set this flag to do the proper
13481                          * EOF handling.
13482                          */
13483                         got_all_of_the_send = 1;
13484                 }
13485         }
13486         if (error) {
13487                 goto out;
13488         }
13489 dataless_eof:
13490         /* EOF thing ? */
13491         if ((sinfo_flags & SCTP_EOF) &&
13492             (got_all_of_the_send == 1)) {
13493                 SCTP_STAT_INCR(sctps_sends_with_eof);
13494                 error = 0;
13495                 if (hold_tcblock == 0) {
13496                         SCTP_TCB_LOCK(stcb);
13497                         hold_tcblock = 1;
13498                 }
13499                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13500                     TAILQ_EMPTY(&asoc->sent_queue) &&
13501                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13502                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13503                                 goto abort_anyway;
13504                         }
13505                         /* there is nothing queued to send, so I'm done... */
13506                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13507                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13508                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13509                                 struct sctp_nets *netp;
13510
13511                                 /* only send SHUTDOWN the first time through */
13512                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13513                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13514                                 }
13515                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13516                                 sctp_stop_timers_for_shutdown(stcb);
13517                                 if (stcb->asoc.alternate) {
13518                                         netp = stcb->asoc.alternate;
13519                                 } else {
13520                                         netp = stcb->asoc.primary_destination;
13521                                 }
13522                                 sctp_send_shutdown(stcb, netp);
13523                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13524                                     netp);
13525                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13526                                     asoc->primary_destination);
13527                         }
13528                 } else {
13529                         /*-
13530                          * we still got (or just got) data to send, so set
13531                          * SHUTDOWN_PENDING
13532                          */
13533                         /*-
13534                          * XXX sockets draft says that SCTP_EOF should be
13535                          * sent with no data.  currently, we will allow user
13536                          * data to be sent first and move to
13537                          * SHUTDOWN-PENDING
13538                          */
13539                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13540                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13541                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13542                                 if (hold_tcblock == 0) {
13543                                         SCTP_TCB_LOCK(stcb);
13544                                         hold_tcblock = 1;
13545                                 }
13546                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13547                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13548                                 }
13549                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13550                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13551                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13552                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13553                                         struct mbuf *op_err;
13554                                         char msg[SCTP_DIAG_INFO_LEN];
13555
13556                         abort_anyway:
13557                                         if (free_cnt_applied) {
13558                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13559                                                 free_cnt_applied = 0;
13560                                         }
13561                                         snprintf(msg, sizeof(msg),
13562                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13563                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13564                                             msg);
13565                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13566                                             op_err, SCTP_SO_LOCKED);
13567                                         /*
13568                                          * now relock the stcb so everything
13569                                          * is sane
13570                                          */
13571                                         hold_tcblock = 0;
13572                                         stcb = NULL;
13573                                         goto out;
13574                                 }
13575                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13576                                     asoc->primary_destination);
13577                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13578                         }
13579                 }
13580         }
13581 skip_out_eof:
13582         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13583                 some_on_control = 1;
13584         }
13585         if (queue_only_for_init) {
13586                 if (hold_tcblock == 0) {
13587                         SCTP_TCB_LOCK(stcb);
13588                         hold_tcblock = 1;
13589                 }
13590                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13591                         /* a collision took us forward? */
13592                         queue_only = 0;
13593                 } else {
13594                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13595                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13596                         queue_only = 1;
13597                 }
13598         }
13599         if ((net->flight_size > net->cwnd) &&
13600             (stcb->asoc.sctp_cmt_on_off == 0)) {
13601                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13602                 queue_only = 1;
13603         } else if (asoc->ifp_had_enobuf) {
13604                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13605                 if (net->flight_size > (2 * net->mtu)) {
13606                         queue_only = 1;
13607                 }
13608                 asoc->ifp_had_enobuf = 0;
13609         }
13610         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13611         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13612             (stcb->asoc.total_flight > 0) &&
13613             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13614             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13615                 /*-
13616                  * Ok, Nagle is set on and we have data outstanding.
13617                  * Don't send anything and let SACKs drive out the
13618                  * data unless wen have a "full" segment to send.
13619                  */
13620                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13621                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13622                 }
13623                 SCTP_STAT_INCR(sctps_naglequeued);
13624                 nagle_applies = 1;
13625         } else {
13626                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13627                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13628                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13629                 }
13630                 SCTP_STAT_INCR(sctps_naglesent);
13631                 nagle_applies = 0;
13632         }
13633         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13634                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13635                     nagle_applies, un_sent);
13636                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13637                     stcb->asoc.total_flight,
13638                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13639         }
13640         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13641                 /* we can attempt to send too. */
13642                 if (hold_tcblock == 0) {
13643                         /*
13644                          * If there is activity recv'ing sacks no need to
13645                          * send
13646                          */
13647                         if (SCTP_TCB_TRYLOCK(stcb)) {
13648                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13649                                 hold_tcblock = 1;
13650                         }
13651                 } else {
13652                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13653                 }
13654         } else if ((queue_only == 0) &&
13655                     (stcb->asoc.peers_rwnd == 0) &&
13656             (stcb->asoc.total_flight == 0)) {
13657                 /* We get to have a probe outstanding */
13658                 if (hold_tcblock == 0) {
13659                         hold_tcblock = 1;
13660                         SCTP_TCB_LOCK(stcb);
13661                 }
13662                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13663         } else if (some_on_control) {
13664                 int num_out, reason, frag_point;
13665
13666                 /* Here we do control only */
13667                 if (hold_tcblock == 0) {
13668                         hold_tcblock = 1;
13669                         SCTP_TCB_LOCK(stcb);
13670                 }
13671                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13672                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13673                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13674         }
13675         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13676             queue_only, stcb->asoc.peers_rwnd, un_sent,
13677             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13678             stcb->asoc.total_output_queue_size, error);
13679
13680 out:
13681 out_unlocked:
13682
13683         if (local_soresv && stcb) {
13684                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13685         }
13686         if (create_lock_applied) {
13687                 SCTP_ASOC_CREATE_UNLOCK(inp);
13688         }
13689         if ((stcb) && hold_tcblock) {
13690                 SCTP_TCB_UNLOCK(stcb);
13691         }
13692         if (stcb && free_cnt_applied) {
13693                 atomic_add_int(&stcb->asoc.refcnt, -1);
13694         }
13695 #ifdef INVARIANTS
13696         if (stcb) {
13697                 if (mtx_owned(&stcb->tcb_mtx)) {
13698                         panic("Leaving with tcb mtx owned?");
13699                 }
13700                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13701                         panic("Leaving with tcb send mtx owned?");
13702                 }
13703         }
13704 #endif
13705         if (top) {
13706                 sctp_m_freem(top);
13707         }
13708         if (control) {
13709                 sctp_m_freem(control);
13710         }
13711         return (error);
13712 }
13713
13714
13715 /*
13716  * generate an AUTHentication chunk, if required
13717  */
13718 struct mbuf *
13719 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13720     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13721     struct sctp_tcb *stcb, uint8_t chunk)
13722 {
13723         struct mbuf *m_auth;
13724         struct sctp_auth_chunk *auth;
13725         int chunk_len;
13726         struct mbuf *cn;
13727
13728         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13729             (stcb == NULL))
13730                 return (m);
13731
13732         if (stcb->asoc.auth_supported == 0) {
13733                 return (m);
13734         }
13735         /* does the requested chunk require auth? */
13736         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13737                 return (m);
13738         }
13739         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13740         if (m_auth == NULL) {
13741                 /* no mbuf's */
13742                 return (m);
13743         }
13744         /* reserve some space if this will be the first mbuf */
13745         if (m == NULL)
13746                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13747         /* fill in the AUTH chunk details */
13748         auth = mtod(m_auth, struct sctp_auth_chunk *);
13749         memset(auth, 0, sizeof(*auth));
13750         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13751         auth->ch.chunk_flags = 0;
13752         chunk_len = sizeof(*auth) +
13753             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13754         auth->ch.chunk_length = htons(chunk_len);
13755         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13756         /* key id and hmac digest will be computed and filled in upon send */
13757
13758         /* save the offset where the auth was inserted into the chain */
13759         *offset = 0;
13760         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13761                 *offset += SCTP_BUF_LEN(cn);
13762         }
13763
13764         /* update length and return pointer to the auth chunk */
13765         SCTP_BUF_LEN(m_auth) = chunk_len;
13766         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13767         if (auth_ret != NULL)
13768                 *auth_ret = auth;
13769
13770         return (m);
13771 }
13772
13773 #ifdef INET6
13774 int
13775 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13776 {
13777         struct nd_prefix *pfx = NULL;
13778         struct nd_pfxrouter *pfxrtr = NULL;
13779         struct sockaddr_in6 gw6;
13780
13781         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13782                 return (0);
13783
13784         /* get prefix entry of address */
13785         ND6_RLOCK();
13786         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13787                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13788                         continue;
13789                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13790                     &src6->sin6_addr, &pfx->ndpr_mask))
13791                         break;
13792         }
13793         /* no prefix entry in the prefix list */
13794         if (pfx == NULL) {
13795                 ND6_RUNLOCK();
13796                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13797                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13798                 return (0);
13799         }
13800
13801         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13802         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13803
13804         /* search installed gateway from prefix entry */
13805         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13806                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13807                 gw6.sin6_family = AF_INET6;
13808                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13809                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13810                     sizeof(struct in6_addr));
13811                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13812                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13813                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13814                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13815                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13816                         ND6_RUNLOCK();
13817                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13818                         return (1);
13819                 }
13820         }
13821         ND6_RUNLOCK();
13822         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13823         return (0);
13824 }
13825 #endif
13826
13827 int
13828 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13829 {
13830 #ifdef INET
13831         struct sockaddr_in *sin, *mask;
13832         struct ifaddr *ifa;
13833         struct in_addr srcnetaddr, gwnetaddr;
13834
13835         if (ro == NULL || ro->ro_rt == NULL ||
13836             sifa->address.sa.sa_family != AF_INET) {
13837                 return (0);
13838         }
13839         ifa = (struct ifaddr *)sifa->ifa;
13840         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13841         sin = &sifa->address.sin;
13842         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13843         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13844         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13845         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13846
13847         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13848         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13849         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13850         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13851         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13852         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13853                 return (1);
13854         }
13855 #endif
13856         return (0);
13857 }