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