sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #if defined(INET) || defined(INET6)
  56 #include <netinet/udp.h>
  57 #endif
  58 #include <netinet/udp_var.h>
  59 #include <machine/in_cksum.h>
  60 #include <netinet/in_kdtrace.h>
  61
  62
  63
  64 #define SCTP_MAX_GAPS_INARRAY 4
  65 struct sack_track {
  66         uint8_t right_edge;     /* mergable on the right edge */
  67         uint8_t left_edge;      /* mergable on the left edge */
  68         uint8_t num_entries;
  69         uint8_t spare;
  70         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  71 };
  72
  73 const struct sack_track sack_array[256] = {
  74         {0, 0, 0, 0,            /* 0x00 */
  75                 {{0, 0},
  76                 {0, 0},
  77                 {0, 0},
  78                 {0, 0}
  79                 }
  80         },
  81         {1, 0, 1, 0,            /* 0x01 */
  82                 {{0, 0},
  83                 {0, 0},
  84                 {0, 0},
  85                 {0, 0}
  86                 }
  87         },
  88         {0, 0, 1, 0,            /* 0x02 */
  89                 {{1, 1},
  90                 {0, 0},
  91                 {0, 0},
  92                 {0, 0}
  93                 }
  94         },
  95         {1, 0, 1, 0,            /* 0x03 */
  96                 {{0, 1},
  97                 {0, 0},
  98                 {0, 0},
  99                 {0, 0}
 100                 }
 101         },
 102         {0, 0, 1, 0,            /* 0x04 */
 103                 {{2, 2},
 104                 {0, 0},
 105                 {0, 0},
 106                 {0, 0}
 107                 }
 108         },
 109         {1, 0, 2, 0,            /* 0x05 */
 110                 {{0, 0},
 111                 {2, 2},
 112                 {0, 0},
 113                 {0, 0}
 114                 }
 115         },
 116         {0, 0, 1, 0,            /* 0x06 */
 117                 {{1, 2},
 118                 {0, 0},
 119                 {0, 0},
 120                 {0, 0}
 121                 }
 122         },
 123         {1, 0, 1, 0,            /* 0x07 */
 124                 {{0, 2},
 125                 {0, 0},
 126                 {0, 0},
 127                 {0, 0}
 128                 }
 129         },
 130         {0, 0, 1, 0,            /* 0x08 */
 131                 {{3, 3},
 132                 {0, 0},
 133                 {0, 0},
 134                 {0, 0}
 135                 }
 136         },
 137         {1, 0, 2, 0,            /* 0x09 */
 138                 {{0, 0},
 139                 {3, 3},
 140                 {0, 0},
 141                 {0, 0}
 142                 }
 143         },
 144         {0, 0, 2, 0,            /* 0x0a */
 145                 {{1, 1},
 146                 {3, 3},
 147                 {0, 0},
 148                 {0, 0}
 149                 }
 150         },
 151         {1, 0, 2, 0,            /* 0x0b */
 152                 {{0, 1},
 153                 {3, 3},
 154                 {0, 0},
 155                 {0, 0}
 156                 }
 157         },
 158         {0, 0, 1, 0,            /* 0x0c */
 159                 {{2, 3},
 160                 {0, 0},
 161                 {0, 0},
 162                 {0, 0}
 163                 }
 164         },
 165         {1, 0, 2, 0,            /* 0x0d */
 166                 {{0, 0},
 167                 {2, 3},
 168                 {0, 0},
 169                 {0, 0}
 170                 }
 171         },
 172         {0, 0, 1, 0,            /* 0x0e */
 173                 {{1, 3},
 174                 {0, 0},
 175                 {0, 0},
 176                 {0, 0}
 177                 }
 178         },
 179         {1, 0, 1, 0,            /* 0x0f */
 180                 {{0, 3},
 181                 {0, 0},
 182                 {0, 0},
 183                 {0, 0}
 184                 }
 185         },
 186         {0, 0, 1, 0,            /* 0x10 */
 187                 {{4, 4},
 188                 {0, 0},
 189                 {0, 0},
 190                 {0, 0}
 191                 }
 192         },
 193         {1, 0, 2, 0,            /* 0x11 */
 194                 {{0, 0},
 195                 {4, 4},
 196                 {0, 0},
 197                 {0, 0}
 198                 }
 199         },
 200         {0, 0, 2, 0,            /* 0x12 */
 201                 {{1, 1},
 202                 {4, 4},
 203                 {0, 0},
 204                 {0, 0}
 205                 }
 206         },
 207         {1, 0, 2, 0,            /* 0x13 */
 208                 {{0, 1},
 209                 {4, 4},
 210                 {0, 0},
 211                 {0, 0}
 212                 }
 213         },
 214         {0, 0, 2, 0,            /* 0x14 */
 215                 {{2, 2},
 216                 {4, 4},
 217                 {0, 0},
 218                 {0, 0}
 219                 }
 220         },
 221         {1, 0, 3, 0,            /* 0x15 */
 222                 {{0, 0},
 223                 {2, 2},
 224                 {4, 4},
 225                 {0, 0}
 226                 }
 227         },
 228         {0, 0, 2, 0,            /* 0x16 */
 229                 {{1, 2},
 230                 {4, 4},
 231                 {0, 0},
 232                 {0, 0}
 233                 }
 234         },
 235         {1, 0, 2, 0,            /* 0x17 */
 236                 {{0, 2},
 237                 {4, 4},
 238                 {0, 0},
 239                 {0, 0}
 240                 }
 241         },
 242         {0, 0, 1, 0,            /* 0x18 */
 243                 {{3, 4},
 244                 {0, 0},
 245                 {0, 0},
 246                 {0, 0}
 247                 }
 248         },
 249         {1, 0, 2, 0,            /* 0x19 */
 250                 {{0, 0},
 251                 {3, 4},
 252                 {0, 0},
 253                 {0, 0}
 254                 }
 255         },
 256         {0, 0, 2, 0,            /* 0x1a */
 257                 {{1, 1},
 258                 {3, 4},
 259                 {0, 0},
 260                 {0, 0}
 261                 }
 262         },
 263         {1, 0, 2, 0,            /* 0x1b */
 264                 {{0, 1},
 265                 {3, 4},
 266                 {0, 0},
 267                 {0, 0}
 268                 }
 269         },
 270         {0, 0, 1, 0,            /* 0x1c */
 271                 {{2, 4},
 272                 {0, 0},
 273                 {0, 0},
 274                 {0, 0}
 275                 }
 276         },
 277         {1, 0, 2, 0,            /* 0x1d */
 278                 {{0, 0},
 279                 {2, 4},
 280                 {0, 0},
 281                 {0, 0}
 282                 }
 283         },
 284         {0, 0, 1, 0,            /* 0x1e */
 285                 {{1, 4},
 286                 {0, 0},
 287                 {0, 0},
 288                 {0, 0}
 289                 }
 290         },
 291         {1, 0, 1, 0,            /* 0x1f */
 292                 {{0, 4},
 293                 {0, 0},
 294                 {0, 0},
 295                 {0, 0}
 296                 }
 297         },
 298         {0, 0, 1, 0,            /* 0x20 */
 299                 {{5, 5},
 300                 {0, 0},
 301                 {0, 0},
 302                 {0, 0}
 303                 }
 304         },
 305         {1, 0, 2, 0,            /* 0x21 */
 306                 {{0, 0},
 307                 {5, 5},
 308                 {0, 0},
 309                 {0, 0}
 310                 }
 311         },
 312         {0, 0, 2, 0,            /* 0x22 */
 313                 {{1, 1},
 314                 {5, 5},
 315                 {0, 0},
 316                 {0, 0}
 317                 }
 318         },
 319         {1, 0, 2, 0,            /* 0x23 */
 320                 {{0, 1},
 321                 {5, 5},
 322                 {0, 0},
 323                 {0, 0}
 324                 }
 325         },
 326         {0, 0, 2, 0,            /* 0x24 */
 327                 {{2, 2},
 328                 {5, 5},
 329                 {0, 0},
 330                 {0, 0}
 331                 }
 332         },
 333         {1, 0, 3, 0,            /* 0x25 */
 334                 {{0, 0},
 335                 {2, 2},
 336                 {5, 5},
 337                 {0, 0}
 338                 }
 339         },
 340         {0, 0, 2, 0,            /* 0x26 */
 341                 {{1, 2},
 342                 {5, 5},
 343                 {0, 0},
 344                 {0, 0}
 345                 }
 346         },
 347         {1, 0, 2, 0,            /* 0x27 */
 348                 {{0, 2},
 349                 {5, 5},
 350                 {0, 0},
 351                 {0, 0}
 352                 }
 353         },
 354         {0, 0, 2, 0,            /* 0x28 */
 355                 {{3, 3},
 356                 {5, 5},
 357                 {0, 0},
 358                 {0, 0}
 359                 }
 360         },
 361         {1, 0, 3, 0,            /* 0x29 */
 362                 {{0, 0},
 363                 {3, 3},
 364                 {5, 5},
 365                 {0, 0}
 366                 }
 367         },
 368         {0, 0, 3, 0,            /* 0x2a */
 369                 {{1, 1},
 370                 {3, 3},
 371                 {5, 5},
 372                 {0, 0}
 373                 }
 374         },
 375         {1, 0, 3, 0,            /* 0x2b */
 376                 {{0, 1},
 377                 {3, 3},
 378                 {5, 5},
 379                 {0, 0}
 380                 }
 381         },
 382         {0, 0, 2, 0,            /* 0x2c */
 383                 {{2, 3},
 384                 {5, 5},
 385                 {0, 0},
 386                 {0, 0}
 387                 }
 388         },
 389         {1, 0, 3, 0,            /* 0x2d */
 390                 {{0, 0},
 391                 {2, 3},
 392                 {5, 5},
 393                 {0, 0}
 394                 }
 395         },
 396         {0, 0, 2, 0,            /* 0x2e */
 397                 {{1, 3},
 398                 {5, 5},
 399                 {0, 0},
 400                 {0, 0}
 401                 }
 402         },
 403         {1, 0, 2, 0,            /* 0x2f */
 404                 {{0, 3},
 405                 {5, 5},
 406                 {0, 0},
 407                 {0, 0}
 408                 }
 409         },
 410         {0, 0, 1, 0,            /* 0x30 */
 411                 {{4, 5},
 412                 {0, 0},
 413                 {0, 0},
 414                 {0, 0}
 415                 }
 416         },
 417         {1, 0, 2, 0,            /* 0x31 */
 418                 {{0, 0},
 419                 {4, 5},
 420                 {0, 0},
 421                 {0, 0}
 422                 }
 423         },
 424         {0, 0, 2, 0,            /* 0x32 */
 425                 {{1, 1},
 426                 {4, 5},
 427                 {0, 0},
 428                 {0, 0}
 429                 }
 430         },
 431         {1, 0, 2, 0,            /* 0x33 */
 432                 {{0, 1},
 433                 {4, 5},
 434                 {0, 0},
 435                 {0, 0}
 436                 }
 437         },
 438         {0, 0, 2, 0,            /* 0x34 */
 439                 {{2, 2},
 440                 {4, 5},
 441                 {0, 0},
 442                 {0, 0}
 443                 }
 444         },
 445         {1, 0, 3, 0,            /* 0x35 */
 446                 {{0, 0},
 447                 {2, 2},
 448                 {4, 5},
 449                 {0, 0}
 450                 }
 451         },
 452         {0, 0, 2, 0,            /* 0x36 */
 453                 {{1, 2},
 454                 {4, 5},
 455                 {0, 0},
 456                 {0, 0}
 457                 }
 458         },
 459         {1, 0, 2, 0,            /* 0x37 */
 460                 {{0, 2},
 461                 {4, 5},
 462                 {0, 0},
 463                 {0, 0}
 464                 }
 465         },
 466         {0, 0, 1, 0,            /* 0x38 */
 467                 {{3, 5},
 468                 {0, 0},
 469                 {0, 0},
 470                 {0, 0}
 471                 }
 472         },
 473         {1, 0, 2, 0,            /* 0x39 */
 474                 {{0, 0},
 475                 {3, 5},
 476                 {0, 0},
 477                 {0, 0}
 478                 }
 479         },
 480         {0, 0, 2, 0,            /* 0x3a */
 481                 {{1, 1},
 482                 {3, 5},
 483                 {0, 0},
 484                 {0, 0}
 485                 }
 486         },
 487         {1, 0, 2, 0,            /* 0x3b */
 488                 {{0, 1},
 489                 {3, 5},
 490                 {0, 0},
 491                 {0, 0}
 492                 }
 493         },
 494         {0, 0, 1, 0,            /* 0x3c */
 495                 {{2, 5},
 496                 {0, 0},
 497                 {0, 0},
 498                 {0, 0}
 499                 }
 500         },
 501         {1, 0, 2, 0,            /* 0x3d */
 502                 {{0, 0},
 503                 {2, 5},
 504                 {0, 0},
 505                 {0, 0}
 506                 }
 507         },
 508         {0, 0, 1, 0,            /* 0x3e */
 509                 {{1, 5},
 510                 {0, 0},
 511                 {0, 0},
 512                 {0, 0}
 513                 }
 514         },
 515         {1, 0, 1, 0,            /* 0x3f */
 516                 {{0, 5},
 517                 {0, 0},
 518                 {0, 0},
 519                 {0, 0}
 520                 }
 521         },
 522         {0, 0, 1, 0,            /* 0x40 */
 523                 {{6, 6},
 524                 {0, 0},
 525                 {0, 0},
 526                 {0, 0}
 527                 }
 528         },
 529         {1, 0, 2, 0,            /* 0x41 */
 530                 {{0, 0},
 531                 {6, 6},
 532                 {0, 0},
 533                 {0, 0}
 534                 }
 535         },
 536         {0, 0, 2, 0,            /* 0x42 */
 537                 {{1, 1},
 538                 {6, 6},
 539                 {0, 0},
 540                 {0, 0}
 541                 }
 542         },
 543         {1, 0, 2, 0,            /* 0x43 */
 544                 {{0, 1},
 545                 {6, 6},
 546                 {0, 0},
 547                 {0, 0}
 548                 }
 549         },
 550         {0, 0, 2, 0,            /* 0x44 */
 551                 {{2, 2},
 552                 {6, 6},
 553                 {0, 0},
 554                 {0, 0}
 555                 }
 556         },
 557         {1, 0, 3, 0,            /* 0x45 */
 558                 {{0, 0},
 559                 {2, 2},
 560                 {6, 6},
 561                 {0, 0}
 562                 }
 563         },
 564         {0, 0, 2, 0,            /* 0x46 */
 565                 {{1, 2},
 566                 {6, 6},
 567                 {0, 0},
 568                 {0, 0}
 569                 }
 570         },
 571         {1, 0, 2, 0,            /* 0x47 */
 572                 {{0, 2},
 573                 {6, 6},
 574                 {0, 0},
 575                 {0, 0}
 576                 }
 577         },
 578         {0, 0, 2, 0,            /* 0x48 */
 579                 {{3, 3},
 580                 {6, 6},
 581                 {0, 0},
 582                 {0, 0}
 583                 }
 584         },
 585         {1, 0, 3, 0,            /* 0x49 */
 586                 {{0, 0},
 587                 {3, 3},
 588                 {6, 6},
 589                 {0, 0}
 590                 }
 591         },
 592         {0, 0, 3, 0,            /* 0x4a */
 593                 {{1, 1},
 594                 {3, 3},
 595                 {6, 6},
 596                 {0, 0}
 597                 }
 598         },
 599         {1, 0, 3, 0,            /* 0x4b */
 600                 {{0, 1},
 601                 {3, 3},
 602                 {6, 6},
 603                 {0, 0}
 604                 }
 605         },
 606         {0, 0, 2, 0,            /* 0x4c */
 607                 {{2, 3},
 608                 {6, 6},
 609                 {0, 0},
 610                 {0, 0}
 611                 }
 612         },
 613         {1, 0, 3, 0,            /* 0x4d */
 614                 {{0, 0},
 615                 {2, 3},
 616                 {6, 6},
 617                 {0, 0}
 618                 }
 619         },
 620         {0, 0, 2, 0,            /* 0x4e */
 621                 {{1, 3},
 622                 {6, 6},
 623                 {0, 0},
 624                 {0, 0}
 625                 }
 626         },
 627         {1, 0, 2, 0,            /* 0x4f */
 628                 {{0, 3},
 629                 {6, 6},
 630                 {0, 0},
 631                 {0, 0}
 632                 }
 633         },
 634         {0, 0, 2, 0,            /* 0x50 */
 635                 {{4, 4},
 636                 {6, 6},
 637                 {0, 0},
 638                 {0, 0}
 639                 }
 640         },
 641         {1, 0, 3, 0,            /* 0x51 */
 642                 {{0, 0},
 643                 {4, 4},
 644                 {6, 6},
 645                 {0, 0}
 646                 }
 647         },
 648         {0, 0, 3, 0,            /* 0x52 */
 649                 {{1, 1},
 650                 {4, 4},
 651                 {6, 6},
 652                 {0, 0}
 653                 }
 654         },
 655         {1, 0, 3, 0,            /* 0x53 */
 656                 {{0, 1},
 657                 {4, 4},
 658                 {6, 6},
 659                 {0, 0}
 660                 }
 661         },
 662         {0, 0, 3, 0,            /* 0x54 */
 663                 {{2, 2},
 664                 {4, 4},
 665                 {6, 6},
 666                 {0, 0}
 667                 }
 668         },
 669         {1, 0, 4, 0,            /* 0x55 */
 670                 {{0, 0},
 671                 {2, 2},
 672                 {4, 4},
 673                 {6, 6}
 674                 }
 675         },
 676         {0, 0, 3, 0,            /* 0x56 */
 677                 {{1, 2},
 678                 {4, 4},
 679                 {6, 6},
 680                 {0, 0}
 681                 }
 682         },
 683         {1, 0, 3, 0,            /* 0x57 */
 684                 {{0, 2},
 685                 {4, 4},
 686                 {6, 6},
 687                 {0, 0}
 688                 }
 689         },
 690         {0, 0, 2, 0,            /* 0x58 */
 691                 {{3, 4},
 692                 {6, 6},
 693                 {0, 0},
 694                 {0, 0}
 695                 }
 696         },
 697         {1, 0, 3, 0,            /* 0x59 */
 698                 {{0, 0},
 699                 {3, 4},
 700                 {6, 6},
 701                 {0, 0}
 702                 }
 703         },
 704         {0, 0, 3, 0,            /* 0x5a */
 705                 {{1, 1},
 706                 {3, 4},
 707                 {6, 6},
 708                 {0, 0}
 709                 }
 710         },
 711         {1, 0, 3, 0,            /* 0x5b */
 712                 {{0, 1},
 713                 {3, 4},
 714                 {6, 6},
 715                 {0, 0}
 716                 }
 717         },
 718         {0, 0, 2, 0,            /* 0x5c */
 719                 {{2, 4},
 720                 {6, 6},
 721                 {0, 0},
 722                 {0, 0}
 723                 }
 724         },
 725         {1, 0, 3, 0,            /* 0x5d */
 726                 {{0, 0},
 727                 {2, 4},
 728                 {6, 6},
 729                 {0, 0}
 730                 }
 731         },
 732         {0, 0, 2, 0,            /* 0x5e */
 733                 {{1, 4},
 734                 {6, 6},
 735                 {0, 0},
 736                 {0, 0}
 737                 }
 738         },
 739         {1, 0, 2, 0,            /* 0x5f */
 740                 {{0, 4},
 741                 {6, 6},
 742                 {0, 0},
 743                 {0, 0}
 744                 }
 745         },
 746         {0, 0, 1, 0,            /* 0x60 */
 747                 {{5, 6},
 748                 {0, 0},
 749                 {0, 0},
 750                 {0, 0}
 751                 }
 752         },
 753         {1, 0, 2, 0,            /* 0x61 */
 754                 {{0, 0},
 755                 {5, 6},
 756                 {0, 0},
 757                 {0, 0}
 758                 }
 759         },
 760         {0, 0, 2, 0,            /* 0x62 */
 761                 {{1, 1},
 762                 {5, 6},
 763                 {0, 0},
 764                 {0, 0}
 765                 }
 766         },
 767         {1, 0, 2, 0,            /* 0x63 */
 768                 {{0, 1},
 769                 {5, 6},
 770                 {0, 0},
 771                 {0, 0}
 772                 }
 773         },
 774         {0, 0, 2, 0,            /* 0x64 */
 775                 {{2, 2},
 776                 {5, 6},
 777                 {0, 0},
 778                 {0, 0}
 779                 }
 780         },
 781         {1, 0, 3, 0,            /* 0x65 */
 782                 {{0, 0},
 783                 {2, 2},
 784                 {5, 6},
 785                 {0, 0}
 786                 }
 787         },
 788         {0, 0, 2, 0,            /* 0x66 */
 789                 {{1, 2},
 790                 {5, 6},
 791                 {0, 0},
 792                 {0, 0}
 793                 }
 794         },
 795         {1, 0, 2, 0,            /* 0x67 */
 796                 {{0, 2},
 797                 {5, 6},
 798                 {0, 0},
 799                 {0, 0}
 800                 }
 801         },
 802         {0, 0, 2, 0,            /* 0x68 */
 803                 {{3, 3},
 804                 {5, 6},
 805                 {0, 0},
 806                 {0, 0}
 807                 }
 808         },
 809         {1, 0, 3, 0,            /* 0x69 */
 810                 {{0, 0},
 811                 {3, 3},
 812                 {5, 6},
 813                 {0, 0}
 814                 }
 815         },
 816         {0, 0, 3, 0,            /* 0x6a */
 817                 {{1, 1},
 818                 {3, 3},
 819                 {5, 6},
 820                 {0, 0}
 821                 }
 822         },
 823         {1, 0, 3, 0,            /* 0x6b */
 824                 {{0, 1},
 825                 {3, 3},
 826                 {5, 6},
 827                 {0, 0}
 828                 }
 829         },
 830         {0, 0, 2, 0,            /* 0x6c */
 831                 {{2, 3},
 832                 {5, 6},
 833                 {0, 0},
 834                 {0, 0}
 835                 }
 836         },
 837         {1, 0, 3, 0,            /* 0x6d */
 838                 {{0, 0},
 839                 {2, 3},
 840                 {5, 6},
 841                 {0, 0}
 842                 }
 843         },
 844         {0, 0, 2, 0,            /* 0x6e */
 845                 {{1, 3},
 846                 {5, 6},
 847                 {0, 0},
 848                 {0, 0}
 849                 }
 850         },
 851         {1, 0, 2, 0,            /* 0x6f */
 852                 {{0, 3},
 853                 {5, 6},
 854                 {0, 0},
 855                 {0, 0}
 856                 }
 857         },
 858         {0, 0, 1, 0,            /* 0x70 */
 859                 {{4, 6},
 860                 {0, 0},
 861                 {0, 0},
 862                 {0, 0}
 863                 }
 864         },
 865         {1, 0, 2, 0,            /* 0x71 */
 866                 {{0, 0},
 867                 {4, 6},
 868                 {0, 0},
 869                 {0, 0}
 870                 }
 871         },
 872         {0, 0, 2, 0,            /* 0x72 */
 873                 {{1, 1},
 874                 {4, 6},
 875                 {0, 0},
 876                 {0, 0}
 877                 }
 878         },
 879         {1, 0, 2, 0,            /* 0x73 */
 880                 {{0, 1},
 881                 {4, 6},
 882                 {0, 0},
 883                 {0, 0}
 884                 }
 885         },
 886         {0, 0, 2, 0,            /* 0x74 */
 887                 {{2, 2},
 888                 {4, 6},
 889                 {0, 0},
 890                 {0, 0}
 891                 }
 892         },
 893         {1, 0, 3, 0,            /* 0x75 */
 894                 {{0, 0},
 895                 {2, 2},
 896                 {4, 6},
 897                 {0, 0}
 898                 }
 899         },
 900         {0, 0, 2, 0,            /* 0x76 */
 901                 {{1, 2},
 902                 {4, 6},
 903                 {0, 0},
 904                 {0, 0}
 905                 }
 906         },
 907         {1, 0, 2, 0,            /* 0x77 */
 908                 {{0, 2},
 909                 {4, 6},
 910                 {0, 0},
 911                 {0, 0}
 912                 }
 913         },
 914         {0, 0, 1, 0,            /* 0x78 */
 915                 {{3, 6},
 916                 {0, 0},
 917                 {0, 0},
 918                 {0, 0}
 919                 }
 920         },
 921         {1, 0, 2, 0,            /* 0x79 */
 922                 {{0, 0},
 923                 {3, 6},
 924                 {0, 0},
 925                 {0, 0}
 926                 }
 927         },
 928         {0, 0, 2, 0,            /* 0x7a */
 929                 {{1, 1},
 930                 {3, 6},
 931                 {0, 0},
 932                 {0, 0}
 933                 }
 934         },
 935         {1, 0, 2, 0,            /* 0x7b */
 936                 {{0, 1},
 937                 {3, 6},
 938                 {0, 0},
 939                 {0, 0}
 940                 }
 941         },
 942         {0, 0, 1, 0,            /* 0x7c */
 943                 {{2, 6},
 944                 {0, 0},
 945                 {0, 0},
 946                 {0, 0}
 947                 }
 948         },
 949         {1, 0, 2, 0,            /* 0x7d */
 950                 {{0, 0},
 951                 {2, 6},
 952                 {0, 0},
 953                 {0, 0}
 954                 }
 955         },
 956         {0, 0, 1, 0,            /* 0x7e */
 957                 {{1, 6},
 958                 {0, 0},
 959                 {0, 0},
 960                 {0, 0}
 961                 }
 962         },
 963         {1, 0, 1, 0,            /* 0x7f */
 964                 {{0, 6},
 965                 {0, 0},
 966                 {0, 0},
 967                 {0, 0}
 968                 }
 969         },
 970         {0, 1, 1, 0,            /* 0x80 */
 971                 {{7, 7},
 972                 {0, 0},
 973                 {0, 0},
 974                 {0, 0}
 975                 }
 976         },
 977         {1, 1, 2, 0,            /* 0x81 */
 978                 {{0, 0},
 979                 {7, 7},
 980                 {0, 0},
 981                 {0, 0}
 982                 }
 983         },
 984         {0, 1, 2, 0,            /* 0x82 */
 985                 {{1, 1},
 986                 {7, 7},
 987                 {0, 0},
 988                 {0, 0}
 989                 }
 990         },
 991         {1, 1, 2, 0,            /* 0x83 */
 992                 {{0, 1},
 993                 {7, 7},
 994                 {0, 0},
 995                 {0, 0}
 996                 }
 997         },
 998         {0, 1, 2, 0,            /* 0x84 */
 999                 {{2, 2},
1000                 {7, 7},
1001                 {0, 0},
1002                 {0, 0}
1003                 }
1004         },
1005         {1, 1, 3, 0,            /* 0x85 */
1006                 {{0, 0},
1007                 {2, 2},
1008                 {7, 7},
1009                 {0, 0}
1010                 }
1011         },
1012         {0, 1, 2, 0,            /* 0x86 */
1013                 {{1, 2},
1014                 {7, 7},
1015                 {0, 0},
1016                 {0, 0}
1017                 }
1018         },
1019         {1, 1, 2, 0,            /* 0x87 */
1020                 {{0, 2},
1021                 {7, 7},
1022                 {0, 0},
1023                 {0, 0}
1024                 }
1025         },
1026         {0, 1, 2, 0,            /* 0x88 */
1027                 {{3, 3},
1028                 {7, 7},
1029                 {0, 0},
1030                 {0, 0}
1031                 }
1032         },
1033         {1, 1, 3, 0,            /* 0x89 */
1034                 {{0, 0},
1035                 {3, 3},
1036                 {7, 7},
1037                 {0, 0}
1038                 }
1039         },
1040         {0, 1, 3, 0,            /* 0x8a */
1041                 {{1, 1},
1042                 {3, 3},
1043                 {7, 7},
1044                 {0, 0}
1045                 }
1046         },
1047         {1, 1, 3, 0,            /* 0x8b */
1048                 {{0, 1},
1049                 {3, 3},
1050                 {7, 7},
1051                 {0, 0}
1052                 }
1053         },
1054         {0, 1, 2, 0,            /* 0x8c */
1055                 {{2, 3},
1056                 {7, 7},
1057                 {0, 0},
1058                 {0, 0}
1059                 }
1060         },
1061         {1, 1, 3, 0,            /* 0x8d */
1062                 {{0, 0},
1063                 {2, 3},
1064                 {7, 7},
1065                 {0, 0}
1066                 }
1067         },
1068         {0, 1, 2, 0,            /* 0x8e */
1069                 {{1, 3},
1070                 {7, 7},
1071                 {0, 0},
1072                 {0, 0}
1073                 }
1074         },
1075         {1, 1, 2, 0,            /* 0x8f */
1076                 {{0, 3},
1077                 {7, 7},
1078                 {0, 0},
1079                 {0, 0}
1080                 }
1081         },
1082         {0, 1, 2, 0,            /* 0x90 */
1083                 {{4, 4},
1084                 {7, 7},
1085                 {0, 0},
1086                 {0, 0}
1087                 }
1088         },
1089         {1, 1, 3, 0,            /* 0x91 */
1090                 {{0, 0},
1091                 {4, 4},
1092                 {7, 7},
1093                 {0, 0}
1094                 }
1095         },
1096         {0, 1, 3, 0,            /* 0x92 */
1097                 {{1, 1},
1098                 {4, 4},
1099                 {7, 7},
1100                 {0, 0}
1101                 }
1102         },
1103         {1, 1, 3, 0,            /* 0x93 */
1104                 {{0, 1},
1105                 {4, 4},
1106                 {7, 7},
1107                 {0, 0}
1108                 }
1109         },
1110         {0, 1, 3, 0,            /* 0x94 */
1111                 {{2, 2},
1112                 {4, 4},
1113                 {7, 7},
1114                 {0, 0}
1115                 }
1116         },
1117         {1, 1, 4, 0,            /* 0x95 */
1118                 {{0, 0},
1119                 {2, 2},
1120                 {4, 4},
1121                 {7, 7}
1122                 }
1123         },
1124         {0, 1, 3, 0,            /* 0x96 */
1125                 {{1, 2},
1126                 {4, 4},
1127                 {7, 7},
1128                 {0, 0}
1129                 }
1130         },
1131         {1, 1, 3, 0,            /* 0x97 */
1132                 {{0, 2},
1133                 {4, 4},
1134                 {7, 7},
1135                 {0, 0}
1136                 }
1137         },
1138         {0, 1, 2, 0,            /* 0x98 */
1139                 {{3, 4},
1140                 {7, 7},
1141                 {0, 0},
1142                 {0, 0}
1143                 }
1144         },
1145         {1, 1, 3, 0,            /* 0x99 */
1146                 {{0, 0},
1147                 {3, 4},
1148                 {7, 7},
1149                 {0, 0}
1150                 }
1151         },
1152         {0, 1, 3, 0,            /* 0x9a */
1153                 {{1, 1},
1154                 {3, 4},
1155                 {7, 7},
1156                 {0, 0}
1157                 }
1158         },
1159         {1, 1, 3, 0,            /* 0x9b */
1160                 {{0, 1},
1161                 {3, 4},
1162                 {7, 7},
1163                 {0, 0}
1164                 }
1165         },
1166         {0, 1, 2, 0,            /* 0x9c */
1167                 {{2, 4},
1168                 {7, 7},
1169                 {0, 0},
1170                 {0, 0}
1171                 }
1172         },
1173         {1, 1, 3, 0,            /* 0x9d */
1174                 {{0, 0},
1175                 {2, 4},
1176                 {7, 7},
1177                 {0, 0}
1178                 }
1179         },
1180         {0, 1, 2, 0,            /* 0x9e */
1181                 {{1, 4},
1182                 {7, 7},
1183                 {0, 0},
1184                 {0, 0}
1185                 }
1186         },
1187         {1, 1, 2, 0,            /* 0x9f */
1188                 {{0, 4},
1189                 {7, 7},
1190                 {0, 0},
1191                 {0, 0}
1192                 }
1193         },
1194         {0, 1, 2, 0,            /* 0xa0 */
1195                 {{5, 5},
1196                 {7, 7},
1197                 {0, 0},
1198                 {0, 0}
1199                 }
1200         },
1201         {1, 1, 3, 0,            /* 0xa1 */
1202                 {{0, 0},
1203                 {5, 5},
1204                 {7, 7},
1205                 {0, 0}
1206                 }
1207         },
1208         {0, 1, 3, 0,            /* 0xa2 */
1209                 {{1, 1},
1210                 {5, 5},
1211                 {7, 7},
1212                 {0, 0}
1213                 }
1214         },
1215         {1, 1, 3, 0,            /* 0xa3 */
1216                 {{0, 1},
1217                 {5, 5},
1218                 {7, 7},
1219                 {0, 0}
1220                 }
1221         },
1222         {0, 1, 3, 0,            /* 0xa4 */
1223                 {{2, 2},
1224                 {5, 5},
1225                 {7, 7},
1226                 {0, 0}
1227                 }
1228         },
1229         {1, 1, 4, 0,            /* 0xa5 */
1230                 {{0, 0},
1231                 {2, 2},
1232                 {5, 5},
1233                 {7, 7}
1234                 }
1235         },
1236         {0, 1, 3, 0,            /* 0xa6 */
1237                 {{1, 2},
1238                 {5, 5},
1239                 {7, 7},
1240                 {0, 0}
1241                 }
1242         },
1243         {1, 1, 3, 0,            /* 0xa7 */
1244                 {{0, 2},
1245                 {5, 5},
1246                 {7, 7},
1247                 {0, 0}
1248                 }
1249         },
1250         {0, 1, 3, 0,            /* 0xa8 */
1251                 {{3, 3},
1252                 {5, 5},
1253                 {7, 7},
1254                 {0, 0}
1255                 }
1256         },
1257         {1, 1, 4, 0,            /* 0xa9 */
1258                 {{0, 0},
1259                 {3, 3},
1260                 {5, 5},
1261                 {7, 7}
1262                 }
1263         },
1264         {0, 1, 4, 0,            /* 0xaa */
1265                 {{1, 1},
1266                 {3, 3},
1267                 {5, 5},
1268                 {7, 7}
1269                 }
1270         },
1271         {1, 1, 4, 0,            /* 0xab */
1272                 {{0, 1},
1273                 {3, 3},
1274                 {5, 5},
1275                 {7, 7}
1276                 }
1277         },
1278         {0, 1, 3, 0,            /* 0xac */
1279                 {{2, 3},
1280                 {5, 5},
1281                 {7, 7},
1282                 {0, 0}
1283                 }
1284         },
1285         {1, 1, 4, 0,            /* 0xad */
1286                 {{0, 0},
1287                 {2, 3},
1288                 {5, 5},
1289                 {7, 7}
1290                 }
1291         },
1292         {0, 1, 3, 0,            /* 0xae */
1293                 {{1, 3},
1294                 {5, 5},
1295                 {7, 7},
1296                 {0, 0}
1297                 }
1298         },
1299         {1, 1, 3, 0,            /* 0xaf */
1300                 {{0, 3},
1301                 {5, 5},
1302                 {7, 7},
1303                 {0, 0}
1304                 }
1305         },
1306         {0, 1, 2, 0,            /* 0xb0 */
1307                 {{4, 5},
1308                 {7, 7},
1309                 {0, 0},
1310                 {0, 0}
1311                 }
1312         },
1313         {1, 1, 3, 0,            /* 0xb1 */
1314                 {{0, 0},
1315                 {4, 5},
1316                 {7, 7},
1317                 {0, 0}
1318                 }
1319         },
1320         {0, 1, 3, 0,            /* 0xb2 */
1321                 {{1, 1},
1322                 {4, 5},
1323                 {7, 7},
1324                 {0, 0}
1325                 }
1326         },
1327         {1, 1, 3, 0,            /* 0xb3 */
1328                 {{0, 1},
1329                 {4, 5},
1330                 {7, 7},
1331                 {0, 0}
1332                 }
1333         },
1334         {0, 1, 3, 0,            /* 0xb4 */
1335                 {{2, 2},
1336                 {4, 5},
1337                 {7, 7},
1338                 {0, 0}
1339                 }
1340         },
1341         {1, 1, 4, 0,            /* 0xb5 */
1342                 {{0, 0},
1343                 {2, 2},
1344                 {4, 5},
1345                 {7, 7}
1346                 }
1347         },
1348         {0, 1, 3, 0,            /* 0xb6 */
1349                 {{1, 2},
1350                 {4, 5},
1351                 {7, 7},
1352                 {0, 0}
1353                 }
1354         },
1355         {1, 1, 3, 0,            /* 0xb7 */
1356                 {{0, 2},
1357                 {4, 5},
1358                 {7, 7},
1359                 {0, 0}
1360                 }
1361         },
1362         {0, 1, 2, 0,            /* 0xb8 */
1363                 {{3, 5},
1364                 {7, 7},
1365                 {0, 0},
1366                 {0, 0}
1367                 }
1368         },
1369         {1, 1, 3, 0,            /* 0xb9 */
1370                 {{0, 0},
1371                 {3, 5},
1372                 {7, 7},
1373                 {0, 0}
1374                 }
1375         },
1376         {0, 1, 3, 0,            /* 0xba */
1377                 {{1, 1},
1378                 {3, 5},
1379                 {7, 7},
1380                 {0, 0}
1381                 }
1382         },
1383         {1, 1, 3, 0,            /* 0xbb */
1384                 {{0, 1},
1385                 {3, 5},
1386                 {7, 7},
1387                 {0, 0}
1388                 }
1389         },
1390         {0, 1, 2, 0,            /* 0xbc */
1391                 {{2, 5},
1392                 {7, 7},
1393                 {0, 0},
1394                 {0, 0}
1395                 }
1396         },
1397         {1, 1, 3, 0,            /* 0xbd */
1398                 {{0, 0},
1399                 {2, 5},
1400                 {7, 7},
1401                 {0, 0}
1402                 }
1403         },
1404         {0, 1, 2, 0,            /* 0xbe */
1405                 {{1, 5},
1406                 {7, 7},
1407                 {0, 0},
1408                 {0, 0}
1409                 }
1410         },
1411         {1, 1, 2, 0,            /* 0xbf */
1412                 {{0, 5},
1413                 {7, 7},
1414                 {0, 0},
1415                 {0, 0}
1416                 }
1417         },
1418         {0, 1, 1, 0,            /* 0xc0 */
1419                 {{6, 7},
1420                 {0, 0},
1421                 {0, 0},
1422                 {0, 0}
1423                 }
1424         },
1425         {1, 1, 2, 0,            /* 0xc1 */
1426                 {{0, 0},
1427                 {6, 7},
1428                 {0, 0},
1429                 {0, 0}
1430                 }
1431         },
1432         {0, 1, 2, 0,            /* 0xc2 */
1433                 {{1, 1},
1434                 {6, 7},
1435                 {0, 0},
1436                 {0, 0}
1437                 }
1438         },
1439         {1, 1, 2, 0,            /* 0xc3 */
1440                 {{0, 1},
1441                 {6, 7},
1442                 {0, 0},
1443                 {0, 0}
1444                 }
1445         },
1446         {0, 1, 2, 0,            /* 0xc4 */
1447                 {{2, 2},
1448                 {6, 7},
1449                 {0, 0},
1450                 {0, 0}
1451                 }
1452         },
1453         {1, 1, 3, 0,            /* 0xc5 */
1454                 {{0, 0},
1455                 {2, 2},
1456                 {6, 7},
1457                 {0, 0}
1458                 }
1459         },
1460         {0, 1, 2, 0,            /* 0xc6 */
1461                 {{1, 2},
1462                 {6, 7},
1463                 {0, 0},
1464                 {0, 0}
1465                 }
1466         },
1467         {1, 1, 2, 0,            /* 0xc7 */
1468                 {{0, 2},
1469                 {6, 7},
1470                 {0, 0},
1471                 {0, 0}
1472                 }
1473         },
1474         {0, 1, 2, 0,            /* 0xc8 */
1475                 {{3, 3},
1476                 {6, 7},
1477                 {0, 0},
1478                 {0, 0}
1479                 }
1480         },
1481         {1, 1, 3, 0,            /* 0xc9 */
1482                 {{0, 0},
1483                 {3, 3},
1484                 {6, 7},
1485                 {0, 0}
1486                 }
1487         },
1488         {0, 1, 3, 0,            /* 0xca */
1489                 {{1, 1},
1490                 {3, 3},
1491                 {6, 7},
1492                 {0, 0}
1493                 }
1494         },
1495         {1, 1, 3, 0,            /* 0xcb */
1496                 {{0, 1},
1497                 {3, 3},
1498                 {6, 7},
1499                 {0, 0}
1500                 }
1501         },
1502         {0, 1, 2, 0,            /* 0xcc */
1503                 {{2, 3},
1504                 {6, 7},
1505                 {0, 0},
1506                 {0, 0}
1507                 }
1508         },
1509         {1, 1, 3, 0,            /* 0xcd */
1510                 {{0, 0},
1511                 {2, 3},
1512                 {6, 7},
1513                 {0, 0}
1514                 }
1515         },
1516         {0, 1, 2, 0,            /* 0xce */
1517                 {{1, 3},
1518                 {6, 7},
1519                 {0, 0},
1520                 {0, 0}
1521                 }
1522         },
1523         {1, 1, 2, 0,            /* 0xcf */
1524                 {{0, 3},
1525                 {6, 7},
1526                 {0, 0},
1527                 {0, 0}
1528                 }
1529         },
1530         {0, 1, 2, 0,            /* 0xd0 */
1531                 {{4, 4},
1532                 {6, 7},
1533                 {0, 0},
1534                 {0, 0}
1535                 }
1536         },
1537         {1, 1, 3, 0,            /* 0xd1 */
1538                 {{0, 0},
1539                 {4, 4},
1540                 {6, 7},
1541                 {0, 0}
1542                 }
1543         },
1544         {0, 1, 3, 0,            /* 0xd2 */
1545                 {{1, 1},
1546                 {4, 4},
1547                 {6, 7},
1548                 {0, 0}
1549                 }
1550         },
1551         {1, 1, 3, 0,            /* 0xd3 */
1552                 {{0, 1},
1553                 {4, 4},
1554                 {6, 7},
1555                 {0, 0}
1556                 }
1557         },
1558         {0, 1, 3, 0,            /* 0xd4 */
1559                 {{2, 2},
1560                 {4, 4},
1561                 {6, 7},
1562                 {0, 0}
1563                 }
1564         },
1565         {1, 1, 4, 0,            /* 0xd5 */
1566                 {{0, 0},
1567                 {2, 2},
1568                 {4, 4},
1569                 {6, 7}
1570                 }
1571         },
1572         {0, 1, 3, 0,            /* 0xd6 */
1573                 {{1, 2},
1574                 {4, 4},
1575                 {6, 7},
1576                 {0, 0}
1577                 }
1578         },
1579         {1, 1, 3, 0,            /* 0xd7 */
1580                 {{0, 2},
1581                 {4, 4},
1582                 {6, 7},
1583                 {0, 0}
1584                 }
1585         },
1586         {0, 1, 2, 0,            /* 0xd8 */
1587                 {{3, 4},
1588                 {6, 7},
1589                 {0, 0},
1590                 {0, 0}
1591                 }
1592         },
1593         {1, 1, 3, 0,            /* 0xd9 */
1594                 {{0, 0},
1595                 {3, 4},
1596                 {6, 7},
1597                 {0, 0}
1598                 }
1599         },
1600         {0, 1, 3, 0,            /* 0xda */
1601                 {{1, 1},
1602                 {3, 4},
1603                 {6, 7},
1604                 {0, 0}
1605                 }
1606         },
1607         {1, 1, 3, 0,            /* 0xdb */
1608                 {{0, 1},
1609                 {3, 4},
1610                 {6, 7},
1611                 {0, 0}
1612                 }
1613         },
1614         {0, 1, 2, 0,            /* 0xdc */
1615                 {{2, 4},
1616                 {6, 7},
1617                 {0, 0},
1618                 {0, 0}
1619                 }
1620         },
1621         {1, 1, 3, 0,            /* 0xdd */
1622                 {{0, 0},
1623                 {2, 4},
1624                 {6, 7},
1625                 {0, 0}
1626                 }
1627         },
1628         {0, 1, 2, 0,            /* 0xde */
1629                 {{1, 4},
1630                 {6, 7},
1631                 {0, 0},
1632                 {0, 0}
1633                 }
1634         },
1635         {1, 1, 2, 0,            /* 0xdf */
1636                 {{0, 4},
1637                 {6, 7},
1638                 {0, 0},
1639                 {0, 0}
1640                 }
1641         },
1642         {0, 1, 1, 0,            /* 0xe0 */
1643                 {{5, 7},
1644                 {0, 0},
1645                 {0, 0},
1646                 {0, 0}
1647                 }
1648         },
1649         {1, 1, 2, 0,            /* 0xe1 */
1650                 {{0, 0},
1651                 {5, 7},
1652                 {0, 0},
1653                 {0, 0}
1654                 }
1655         },
1656         {0, 1, 2, 0,            /* 0xe2 */
1657                 {{1, 1},
1658                 {5, 7},
1659                 {0, 0},
1660                 {0, 0}
1661                 }
1662         },
1663         {1, 1, 2, 0,            /* 0xe3 */
1664                 {{0, 1},
1665                 {5, 7},
1666                 {0, 0},
1667                 {0, 0}
1668                 }
1669         },
1670         {0, 1, 2, 0,            /* 0xe4 */
1671                 {{2, 2},
1672                 {5, 7},
1673                 {0, 0},
1674                 {0, 0}
1675                 }
1676         },
1677         {1, 1, 3, 0,            /* 0xe5 */
1678                 {{0, 0},
1679                 {2, 2},
1680                 {5, 7},
1681                 {0, 0}
1682                 }
1683         },
1684         {0, 1, 2, 0,            /* 0xe6 */
1685                 {{1, 2},
1686                 {5, 7},
1687                 {0, 0},
1688                 {0, 0}
1689                 }
1690         },
1691         {1, 1, 2, 0,            /* 0xe7 */
1692                 {{0, 2},
1693                 {5, 7},
1694                 {0, 0},
1695                 {0, 0}
1696                 }
1697         },
1698         {0, 1, 2, 0,            /* 0xe8 */
1699                 {{3, 3},
1700                 {5, 7},
1701                 {0, 0},
1702                 {0, 0}
1703                 }
1704         },
1705         {1, 1, 3, 0,            /* 0xe9 */
1706                 {{0, 0},
1707                 {3, 3},
1708                 {5, 7},
1709                 {0, 0}
1710                 }
1711         },
1712         {0, 1, 3, 0,            /* 0xea */
1713                 {{1, 1},
1714                 {3, 3},
1715                 {5, 7},
1716                 {0, 0}
1717                 }
1718         },
1719         {1, 1, 3, 0,            /* 0xeb */
1720                 {{0, 1},
1721                 {3, 3},
1722                 {5, 7},
1723                 {0, 0}
1724                 }
1725         },
1726         {0, 1, 2, 0,            /* 0xec */
1727                 {{2, 3},
1728                 {5, 7},
1729                 {0, 0},
1730                 {0, 0}
1731                 }
1732         },
1733         {1, 1, 3, 0,            /* 0xed */
1734                 {{0, 0},
1735                 {2, 3},
1736                 {5, 7},
1737                 {0, 0}
1738                 }
1739         },
1740         {0, 1, 2, 0,            /* 0xee */
1741                 {{1, 3},
1742                 {5, 7},
1743                 {0, 0},
1744                 {0, 0}
1745                 }
1746         },
1747         {1, 1, 2, 0,            /* 0xef */
1748                 {{0, 3},
1749                 {5, 7},
1750                 {0, 0},
1751                 {0, 0}
1752                 }
1753         },
1754         {0, 1, 1, 0,            /* 0xf0 */
1755                 {{4, 7},
1756                 {0, 0},
1757                 {0, 0},
1758                 {0, 0}
1759                 }
1760         },
1761         {1, 1, 2, 0,            /* 0xf1 */
1762                 {{0, 0},
1763                 {4, 7},
1764                 {0, 0},
1765                 {0, 0}
1766                 }
1767         },
1768         {0, 1, 2, 0,            /* 0xf2 */
1769                 {{1, 1},
1770                 {4, 7},
1771                 {0, 0},
1772                 {0, 0}
1773                 }
1774         },
1775         {1, 1, 2, 0,            /* 0xf3 */
1776                 {{0, 1},
1777                 {4, 7},
1778                 {0, 0},
1779                 {0, 0}
1780                 }
1781         },
1782         {0, 1, 2, 0,            /* 0xf4 */
1783                 {{2, 2},
1784                 {4, 7},
1785                 {0, 0},
1786                 {0, 0}
1787                 }
1788         },
1789         {1, 1, 3, 0,            /* 0xf5 */
1790                 {{0, 0},
1791                 {2, 2},
1792                 {4, 7},
1793                 {0, 0}
1794                 }
1795         },
1796         {0, 1, 2, 0,            /* 0xf6 */
1797                 {{1, 2},
1798                 {4, 7},
1799                 {0, 0},
1800                 {0, 0}
1801                 }
1802         },
1803         {1, 1, 2, 0,            /* 0xf7 */
1804                 {{0, 2},
1805                 {4, 7},
1806                 {0, 0},
1807                 {0, 0}
1808                 }
1809         },
1810         {0, 1, 1, 0,            /* 0xf8 */
1811                 {{3, 7},
1812                 {0, 0},
1813                 {0, 0},
1814                 {0, 0}
1815                 }
1816         },
1817         {1, 1, 2, 0,            /* 0xf9 */
1818                 {{0, 0},
1819                 {3, 7},
1820                 {0, 0},
1821                 {0, 0}
1822                 }
1823         },
1824         {0, 1, 2, 0,            /* 0xfa */
1825                 {{1, 1},
1826                 {3, 7},
1827                 {0, 0},
1828                 {0, 0}
1829                 }
1830         },
1831         {1, 1, 2, 0,            /* 0xfb */
1832                 {{0, 1},
1833                 {3, 7},
1834                 {0, 0},
1835                 {0, 0}
1836                 }
1837         },
1838         {0, 1, 1, 0,            /* 0xfc */
1839                 {{2, 7},
1840                 {0, 0},
1841                 {0, 0},
1842                 {0, 0}
1843                 }
1844         },
1845         {1, 1, 2, 0,            /* 0xfd */
1846                 {{0, 0},
1847                 {2, 7},
1848                 {0, 0},
1849                 {0, 0}
1850                 }
1851         },
1852         {0, 1, 1, 0,            /* 0xfe */
1853                 {{1, 7},
1854                 {0, 0},
1855                 {0, 0},
1856                 {0, 0}
1857                 }
1858         },
1859         {1, 1, 1, 0,            /* 0xff */
1860                 {{0, 7},
1861                 {0, 0},
1862                 {0, 0},
1863                 {0, 0}
1864                 }
1865         }
1866 };
1867
1868
1869 int
1870 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1871     struct sctp_scoping *scope,
1872     int do_update)
1873 {
1874         if ((scope->loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (scope->ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = &ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((scope->ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (scope->ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = &ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((scope->site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1944 {
1945 #if defined(INET) || defined(INET6)
1946         struct sctp_paramhdr *paramh;
1947         struct mbuf *mret;
1948         uint16_t plen;
1949 #endif
1950
1951         switch (ifa->address.sa.sa_family) {
1952 #ifdef INET
1953         case AF_INET:
1954                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1955                 break;
1956 #endif
1957 #ifdef INET6
1958         case AF_INET6:
1959                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1960                 break;
1961 #endif
1962         default:
1963                 return (m);
1964         }
1965 #if defined(INET) || defined(INET6)
1966         if (M_TRAILINGSPACE(m) >= plen) {
1967                 /* easy side we just drop it on the end */
1968                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1969                 mret = m;
1970         } else {
1971                 /* Need more space */
1972                 mret = m;
1973                 while (SCTP_BUF_NEXT(mret) != NULL) {
1974                         mret = SCTP_BUF_NEXT(mret);
1975                 }
1976                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1977                 if (SCTP_BUF_NEXT(mret) == NULL) {
1978                         /* We are hosed, can't add more addresses */
1979                         return (m);
1980                 }
1981                 mret = SCTP_BUF_NEXT(mret);
1982                 paramh = mtod(mret, struct sctp_paramhdr *);
1983         }
1984         /* now add the parameter */
1985         switch (ifa->address.sa.sa_family) {
1986 #ifdef INET
1987         case AF_INET:
1988                 {
1989                         struct sctp_ipv4addr_param *ipv4p;
1990                         struct sockaddr_in *sin;
1991
1992                         sin = &ifa->address.sin;
1993                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1994                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1995                         paramh->param_length = htons(plen);
1996                         ipv4p->addr = sin->sin_addr.s_addr;
1997                         SCTP_BUF_LEN(mret) += plen;
1998                         break;
1999                 }
2000 #endif
2001 #ifdef INET6
2002         case AF_INET6:
2003                 {
2004                         struct sctp_ipv6addr_param *ipv6p;
2005                         struct sockaddr_in6 *sin6;
2006
2007                         sin6 = &ifa->address.sin6;
2008                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2009                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2010                         paramh->param_length = htons(plen);
2011                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2012                             sizeof(ipv6p->addr));
2013                         /* clear embedded scope in the address */
2014                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2015                         SCTP_BUF_LEN(mret) += plen;
2016                         break;
2017                 }
2018 #endif
2019         default:
2020                 return (m);
2021         }
2022         if (len != NULL) {
2023                 *len += plen;
2024         }
2025         return (mret);
2026 #endif
2027 }
2028
2029
2030 struct mbuf *
2031 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2032     struct sctp_scoping *scope,
2033     struct mbuf *m_at, int cnt_inits_to,
2034     uint16_t *padding_len, uint16_t *chunk_len)
2035 {
2036         struct sctp_vrf *vrf = NULL;
2037         int cnt, limit_out = 0, total_count;
2038         uint32_t vrf_id;
2039
2040         vrf_id = inp->def_vrf_id;
2041         SCTP_IPI_ADDR_RLOCK();
2042         vrf = sctp_find_vrf(vrf_id);
2043         if (vrf == NULL) {
2044                 SCTP_IPI_ADDR_RUNLOCK();
2045                 return (m_at);
2046         }
2047         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2048                 struct sctp_ifa *sctp_ifap;
2049                 struct sctp_ifn *sctp_ifnp;
2050
2051                 cnt = cnt_inits_to;
2052                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2053                         limit_out = 1;
2054                         cnt = SCTP_ADDRESS_LIMIT;
2055                         goto skip_count;
2056                 }
2057                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2058                         if ((scope->loopback_scope == 0) &&
2059                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2060                                 /*
2061                                  * Skip loopback devices if loopback_scope
2062                                  * not set
2063                                  */
2064                                 continue;
2065                         }
2066                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2067 #ifdef INET
2068                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2069                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2070                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2071                                         continue;
2072                                 }
2073 #endif
2074 #ifdef INET6
2075                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2076                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2077                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2078                                         continue;
2079                                 }
2080 #endif
2081                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2082                                         continue;
2083                                 }
2084                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2085                                         continue;
2086                                 }
2087                                 cnt++;
2088                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2089                                         break;
2090                                 }
2091                         }
2092                         if (cnt > SCTP_ADDRESS_LIMIT) {
2093                                 break;
2094                         }
2095                 }
2096 skip_count:
2097                 if (cnt > 1) {
2098                         total_count = 0;
2099                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2100                                 cnt = 0;
2101                                 if ((scope->loopback_scope == 0) &&
2102                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2103                                         /*
2104                                          * Skip loopback devices if
2105                                          * loopback_scope not set
2106                                          */
2107                                         continue;
2108                                 }
2109                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2110 #ifdef INET
2111                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2112                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2113                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2114                                                 continue;
2115                                         }
2116 #endif
2117 #ifdef INET6
2118                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2119                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2120                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2121                                                 continue;
2122                                         }
2123 #endif
2124                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2125                                                 continue;
2126                                         }
2127                                         if (sctp_is_address_in_scope(sctp_ifap,
2128                                             scope, 0) == 0) {
2129                                                 continue;
2130                                         }
2131                                         if ((chunk_len != NULL) &&
2132                                             (padding_len != NULL) &&
2133                                             (*padding_len > 0)) {
2134                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2135                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2136                                                 *chunk_len += *padding_len;
2137                                                 *padding_len = 0;
2138                                         }
2139                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2140                                         if (limit_out) {
2141                                                 cnt++;
2142                                                 total_count++;
2143                                                 if (cnt >= 2) {
2144                                                         /*
2145                                                          * two from each
2146                                                          * address
2147                                                          */
2148                                                         break;
2149                                                 }
2150                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2151                                                         /* No more addresses */
2152                                                         break;
2153                                                 }
2154                                         }
2155                                 }
2156                         }
2157                 }
2158         } else {
2159                 struct sctp_laddr *laddr;
2160
2161                 cnt = cnt_inits_to;
2162                 /* First, how many ? */
2163                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2164                         if (laddr->ifa == NULL) {
2165                                 continue;
2166                         }
2167                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2168                                 /*
2169                                  * Address being deleted by the system, dont
2170                                  * list.
2171                                  */
2172                                 continue;
2173                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2174                                 /*
2175                                  * Address being deleted on this ep don't
2176                                  * list.
2177                                  */
2178                                 continue;
2179                         }
2180                         if (sctp_is_address_in_scope(laddr->ifa,
2181                             scope, 1) == 0) {
2182                                 continue;
2183                         }
2184                         cnt++;
2185                 }
2186                 /*
2187                  * To get through a NAT we only list addresses if we have
2188                  * more than one. That way if you just bind a single address
2189                  * we let the source of the init dictate our address.
2190                  */
2191                 if (cnt > 1) {
2192                         cnt = cnt_inits_to;
2193                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2194                                 if (laddr->ifa == NULL) {
2195                                         continue;
2196                                 }
2197                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2198                                         continue;
2199                                 }
2200                                 if (sctp_is_address_in_scope(laddr->ifa,
2201                                     scope, 0) == 0) {
2202                                         continue;
2203                                 }
2204                                 if ((chunk_len != NULL) &&
2205                                     (padding_len != NULL) &&
2206                                     (*padding_len > 0)) {
2207                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2208                                         SCTP_BUF_LEN(m_at) += *padding_len;
2209                                         *chunk_len += *padding_len;
2210                                         *padding_len = 0;
2211                                 }
2212                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2213                                 cnt++;
2214                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2215                                         break;
2216                                 }
2217                         }
2218                 }
2219         }
2220         SCTP_IPI_ADDR_RUNLOCK();
2221         return (m_at);
2222 }
2223
2224 static struct sctp_ifa *
2225 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2226     uint8_t dest_is_loop,
2227     uint8_t dest_is_priv,
2228     sa_family_t fam)
2229 {
2230         uint8_t dest_is_global = 0;
2231
2232         /* dest_is_priv is true if destination is a private address */
2233         /* dest_is_loop is true if destination is a loopback addresses */
2234
2235         /**
2236          * Here we determine if its a preferred address. A preferred address
2237          * means it is the same scope or higher scope then the destination.
2238          * L = loopback, P = private, G = global
2239          * -----------------------------------------
2240          *    src    |  dest | result
2241          *  ----------------------------------------
2242          *     L     |    L  |    yes
2243          *  -----------------------------------------
2244          *     P     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     G     |    L  |    yes-v4 no-v6
2247          *  -----------------------------------------
2248          *     L     |    P  |    no
2249          *  -----------------------------------------
2250          *     P     |    P  |    yes
2251          *  -----------------------------------------
2252          *     G     |    P  |    no
2253          *   -----------------------------------------
2254          *     L     |    G  |    no
2255          *   -----------------------------------------
2256          *     P     |    G  |    no
2257          *    -----------------------------------------
2258          *     G     |    G  |    yes
2259          *    -----------------------------------------
2260          */
2261
2262         if (ifa->address.sa.sa_family != fam) {
2263                 /* forget mis-matched family */
2264                 return (NULL);
2265         }
2266         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2267                 dest_is_global = 1;
2268         }
2269         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2270         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2271         /* Ok the address may be ok */
2272 #ifdef INET6
2273         if (fam == AF_INET6) {
2274                 /* ok to use deprecated addresses? no lets not! */
2275                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2276                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2277                         return (NULL);
2278                 }
2279                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2280                         if (dest_is_loop) {
2281                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2282                                 return (NULL);
2283                         }
2284                 }
2285                 if (ifa->src_is_glob) {
2286                         if (dest_is_loop) {
2287                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2288                                 return (NULL);
2289                         }
2290                 }
2291         }
2292 #endif
2293         /*
2294          * Now that we know what is what, implement or table this could in
2295          * theory be done slicker (it used to be), but this is
2296          * straightforward and easier to validate :-)
2297          */
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2299             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2300         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2301             dest_is_loop, dest_is_priv, dest_is_global);
2302
2303         if ((ifa->src_is_loop) && (dest_is_priv)) {
2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2305                 return (NULL);
2306         }
2307         if ((ifa->src_is_glob) && (dest_is_priv)) {
2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2309                 return (NULL);
2310         }
2311         if ((ifa->src_is_loop) && (dest_is_global)) {
2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2313                 return (NULL);
2314         }
2315         if ((ifa->src_is_priv) && (dest_is_global)) {
2316                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2317                 return (NULL);
2318         }
2319         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2320         /* its a preferred address */
2321         return (ifa);
2322 }
2323
2324 static struct sctp_ifa *
2325 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2326     uint8_t dest_is_loop,
2327     uint8_t dest_is_priv,
2328     sa_family_t fam)
2329 {
2330         uint8_t dest_is_global = 0;
2331
2332         /**
2333          * Here we determine if its a acceptable address. A acceptable
2334          * address means it is the same scope or higher scope but we can
2335          * allow for NAT which means its ok to have a global dest and a
2336          * private src.
2337          *
2338          * L = loopback, P = private, G = global
2339          * -----------------------------------------
2340          *  src    |  dest | result
2341          * -----------------------------------------
2342          *   L     |   L   |    yes
2343          *  -----------------------------------------
2344          *   P     |   L   |    yes-v4 no-v6
2345          *  -----------------------------------------
2346          *   G     |   L   |    yes
2347          * -----------------------------------------
2348          *   L     |   P   |    no
2349          * -----------------------------------------
2350          *   P     |   P   |    yes
2351          * -----------------------------------------
2352          *   G     |   P   |    yes - May not work
2353          * -----------------------------------------
2354          *   L     |   G   |    no
2355          * -----------------------------------------
2356          *   P     |   G   |    yes - May not work
2357          * -----------------------------------------
2358          *   G     |   G   |    yes
2359          * -----------------------------------------
2360          */
2361
2362         if (ifa->address.sa.sa_family != fam) {
2363                 /* forget non matching family */
2364                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2365                     ifa->address.sa.sa_family, fam);
2366                 return (NULL);
2367         }
2368         /* Ok the address may be ok */
2369         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2370         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2371             dest_is_loop, dest_is_priv);
2372         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2373                 dest_is_global = 1;
2374         }
2375 #ifdef INET6
2376         if (fam == AF_INET6) {
2377                 /* ok to use deprecated addresses? */
2378                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2379                         return (NULL);
2380                 }
2381                 if (ifa->src_is_priv) {
2382                         /* Special case, linklocal to loop */
2383                         if (dest_is_loop)
2384                                 return (NULL);
2385                 }
2386         }
2387 #endif
2388         /*
2389          * Now that we know what is what, implement our table. This could in
2390          * theory be done slicker (it used to be), but this is
2391          * straightforward and easier to validate :-)
2392          */
2393         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2394             ifa->src_is_loop,
2395             dest_is_priv);
2396         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2397                 return (NULL);
2398         }
2399         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2400             ifa->src_is_loop,
2401             dest_is_global);
2402         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2403                 return (NULL);
2404         }
2405         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2406         /* its an acceptable address */
2407         return (ifa);
2408 }
2409
2410 int
2411 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2412 {
2413         struct sctp_laddr *laddr;
2414
2415         if (stcb == NULL) {
2416                 /* There are no restrictions, no TCB :-) */
2417                 return (0);
2418         }
2419         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2420                 if (laddr->ifa == NULL) {
2421                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2422                             __func__);
2423                         continue;
2424                 }
2425                 if (laddr->ifa == ifa) {
2426                         /* Yes it is on the list */
2427                         return (1);
2428                 }
2429         }
2430         return (0);
2431 }
2432
2433
2434 int
2435 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2436 {
2437         struct sctp_laddr *laddr;
2438
2439         if (ifa == NULL)
2440                 return (0);
2441         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2442                 if (laddr->ifa == NULL) {
2443                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2444                             __func__);
2445                         continue;
2446                 }
2447                 if ((laddr->ifa == ifa) && laddr->action == 0)
2448                         /* same pointer */
2449                         return (1);
2450         }
2451         return (0);
2452 }
2453
2454
2455
2456 static struct sctp_ifa *
2457 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2458     sctp_route_t *ro,
2459     uint32_t vrf_id,
2460     int non_asoc_addr_ok,
2461     uint8_t dest_is_priv,
2462     uint8_t dest_is_loop,
2463     sa_family_t fam)
2464 {
2465         struct sctp_laddr *laddr, *starting_point;
2466         void *ifn;
2467         int resettotop = 0;
2468         struct sctp_ifn *sctp_ifn;
2469         struct sctp_ifa *sctp_ifa, *sifa;
2470         struct sctp_vrf *vrf;
2471         uint32_t ifn_index;
2472
2473         vrf = sctp_find_vrf(vrf_id);
2474         if (vrf == NULL)
2475                 return (NULL);
2476
2477         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2478         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2479         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2480         /*
2481          * first question, is the ifn we will emit on in our list, if so, we
2482          * want such an address. Note that we first looked for a preferred
2483          * address.
2484          */
2485         if (sctp_ifn) {
2486                 /* is a preferred one on the interface we route out? */
2487                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2488 #ifdef INET
2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2490                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2491                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2492                                 continue;
2493                         }
2494 #endif
2495 #ifdef INET6
2496                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2497                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2498                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2499                                 continue;
2500                         }
2501 #endif
2502                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2503                             (non_asoc_addr_ok == 0))
2504                                 continue;
2505                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2506                             dest_is_loop,
2507                             dest_is_priv, fam);
2508                         if (sifa == NULL)
2509                                 continue;
2510                         if (sctp_is_addr_in_ep(inp, sifa)) {
2511                                 atomic_add_int(&sifa->refcount, 1);
2512                                 return (sifa);
2513                         }
2514                 }
2515         }
2516         /*
2517          * ok, now we now need to find one on the list of the addresses. We
2518          * can't get one on the emitting interface so let's find first a
2519          * preferred one. If not that an acceptable one otherwise... we
2520          * return NULL.
2521          */
2522         starting_point = inp->next_addr_touse;
2523 once_again:
2524         if (inp->next_addr_touse == NULL) {
2525                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2526                 resettotop = 1;
2527         }
2528         for (laddr = inp->next_addr_touse; laddr;
2529             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2530                 if (laddr->ifa == NULL) {
2531                         /* address has been removed */
2532                         continue;
2533                 }
2534                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2535                         /* address is being deleted */
2536                         continue;
2537                 }
2538                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2539                     dest_is_priv, fam);
2540                 if (sifa == NULL)
2541                         continue;
2542                 atomic_add_int(&sifa->refcount, 1);
2543                 return (sifa);
2544         }
2545         if (resettotop == 0) {
2546                 inp->next_addr_touse = NULL;
2547                 goto once_again;
2548         }
2549
2550         inp->next_addr_touse = starting_point;
2551         resettotop = 0;
2552 once_again_too:
2553         if (inp->next_addr_touse == NULL) {
2554                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2555                 resettotop = 1;
2556         }
2557
2558         /* ok, what about an acceptable address in the inp */
2559         for (laddr = inp->next_addr_touse; laddr;
2560             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2561                 if (laddr->ifa == NULL) {
2562                         /* address has been removed */
2563                         continue;
2564                 }
2565                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2566                         /* address is being deleted */
2567                         continue;
2568                 }
2569                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2570                     dest_is_priv, fam);
2571                 if (sifa == NULL)
2572                         continue;
2573                 atomic_add_int(&sifa->refcount, 1);
2574                 return (sifa);
2575         }
2576         if (resettotop == 0) {
2577                 inp->next_addr_touse = NULL;
2578                 goto once_again_too;
2579         }
2580
2581         /*
2582          * no address bound can be a source for the destination we are in
2583          * trouble
2584          */
2585         return (NULL);
2586 }
2587
2588
2589
2590 static struct sctp_ifa *
2591 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2592     struct sctp_tcb *stcb,
2593     sctp_route_t *ro,
2594     uint32_t vrf_id,
2595     uint8_t dest_is_priv,
2596     uint8_t dest_is_loop,
2597     int non_asoc_addr_ok,
2598     sa_family_t fam)
2599 {
2600         struct sctp_laddr *laddr, *starting_point;
2601         void *ifn;
2602         struct sctp_ifn *sctp_ifn;
2603         struct sctp_ifa *sctp_ifa, *sifa;
2604         uint8_t start_at_beginning = 0;
2605         struct sctp_vrf *vrf;
2606         uint32_t ifn_index;
2607
2608         /*
2609          * first question, is the ifn we will emit on in our list, if so, we
2610          * want that one.
2611          */
2612         vrf = sctp_find_vrf(vrf_id);
2613         if (vrf == NULL)
2614                 return (NULL);
2615
2616         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2617         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2618         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2619
2620         /*
2621          * first question, is the ifn we will emit on in our list?  If so,
2622          * we want that one. First we look for a preferred. Second, we go
2623          * for an acceptable.
2624          */
2625         if (sctp_ifn) {
2626                 /* first try for a preferred address on the ep */
2627                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2628 #ifdef INET
2629                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2630                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2631                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2632                                 continue;
2633                         }
2634 #endif
2635 #ifdef INET6
2636                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2637                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2638                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2639                                 continue;
2640                         }
2641 #endif
2642                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2643                                 continue;
2644                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2645                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2646                                 if (sifa == NULL)
2647                                         continue;
2648                                 if (((non_asoc_addr_ok == 0) &&
2649                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2650                                     (non_asoc_addr_ok &&
2651                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2652                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2653                                         /* on the no-no list */
2654                                         continue;
2655                                 }
2656                                 atomic_add_int(&sifa->refcount, 1);
2657                                 return (sifa);
2658                         }
2659                 }
2660                 /* next try for an acceptable address on the ep */
2661                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2662 #ifdef INET
2663                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2664                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2665                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2666                                 continue;
2667                         }
2668 #endif
2669 #ifdef INET6
2670                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2671                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2672                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2673                                 continue;
2674                         }
2675 #endif
2676                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2677                                 continue;
2678                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2679                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2680                                 if (sifa == NULL)
2681                                         continue;
2682                                 if (((non_asoc_addr_ok == 0) &&
2683                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2684                                     (non_asoc_addr_ok &&
2685                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2686                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2687                                         /* on the no-no list */
2688                                         continue;
2689                                 }
2690                                 atomic_add_int(&sifa->refcount, 1);
2691                                 return (sifa);
2692                         }
2693                 }
2694
2695         }
2696         /*
2697          * if we can't find one like that then we must look at all addresses
2698          * bound to pick one at first preferable then secondly acceptable.
2699          */
2700         starting_point = stcb->asoc.last_used_address;
2701 sctp_from_the_top:
2702         if (stcb->asoc.last_used_address == NULL) {
2703                 start_at_beginning = 1;
2704                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2705         }
2706         /* search beginning with the last used address */
2707         for (laddr = stcb->asoc.last_used_address; laddr;
2708             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2709                 if (laddr->ifa == NULL) {
2710                         /* address has been removed */
2711                         continue;
2712                 }
2713                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2714                         /* address is being deleted */
2715                         continue;
2716                 }
2717                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2718                 if (sifa == NULL)
2719                         continue;
2720                 if (((non_asoc_addr_ok == 0) &&
2721                     (sctp_is_addr_restricted(stcb, sifa))) ||
2722                     (non_asoc_addr_ok &&
2723                     (sctp_is_addr_restricted(stcb, sifa)) &&
2724                     (!sctp_is_addr_pending(stcb, sifa)))) {
2725                         /* on the no-no list */
2726                         continue;
2727                 }
2728                 stcb->asoc.last_used_address = laddr;
2729                 atomic_add_int(&sifa->refcount, 1);
2730                 return (sifa);
2731         }
2732         if (start_at_beginning == 0) {
2733                 stcb->asoc.last_used_address = NULL;
2734                 goto sctp_from_the_top;
2735         }
2736         /* now try for any higher scope than the destination */
2737         stcb->asoc.last_used_address = starting_point;
2738         start_at_beginning = 0;
2739 sctp_from_the_top2:
2740         if (stcb->asoc.last_used_address == NULL) {
2741                 start_at_beginning = 1;
2742                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2743         }
2744         /* search beginning with the last used address */
2745         for (laddr = stcb->asoc.last_used_address; laddr;
2746             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2747                 if (laddr->ifa == NULL) {
2748                         /* address has been removed */
2749                         continue;
2750                 }
2751                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2752                         /* address is being deleted */
2753                         continue;
2754                 }
2755                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2756                     dest_is_priv, fam);
2757                 if (sifa == NULL)
2758                         continue;
2759                 if (((non_asoc_addr_ok == 0) &&
2760                     (sctp_is_addr_restricted(stcb, sifa))) ||
2761                     (non_asoc_addr_ok &&
2762                     (sctp_is_addr_restricted(stcb, sifa)) &&
2763                     (!sctp_is_addr_pending(stcb, sifa)))) {
2764                         /* on the no-no list */
2765                         continue;
2766                 }
2767                 stcb->asoc.last_used_address = laddr;
2768                 atomic_add_int(&sifa->refcount, 1);
2769                 return (sifa);
2770         }
2771         if (start_at_beginning == 0) {
2772                 stcb->asoc.last_used_address = NULL;
2773                 goto sctp_from_the_top2;
2774         }
2775         return (NULL);
2776 }
2777
2778 static struct sctp_ifa *
2779 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2780     struct sctp_inpcb *inp,
2781     struct sctp_tcb *stcb,
2782     int non_asoc_addr_ok,
2783     uint8_t dest_is_loop,
2784     uint8_t dest_is_priv,
2785     int addr_wanted,
2786     sa_family_t fam,
2787     sctp_route_t *ro
2788 )
2789 {
2790         struct sctp_ifa *ifa, *sifa;
2791         int num_eligible_addr = 0;
2792 #ifdef INET6
2793         struct sockaddr_in6 sin6, lsa6;
2794
2795         if (fam == AF_INET6) {
2796                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2797                 (void)sa6_recoverscope(&sin6);
2798         }
2799 #endif                          /* INET6 */
2800         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2801 #ifdef INET
2802                 if ((ifa->address.sa.sa_family == AF_INET) &&
2803                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2804                     &ifa->address.sin.sin_addr) != 0)) {
2805                         continue;
2806                 }
2807 #endif
2808 #ifdef INET6
2809                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2810                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2811                     &ifa->address.sin6.sin6_addr) != 0)) {
2812                         continue;
2813                 }
2814 #endif
2815                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2816                     (non_asoc_addr_ok == 0))
2817                         continue;
2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819                     dest_is_priv, fam);
2820                 if (sifa == NULL)
2821                         continue;
2822 #ifdef INET6
2823                 if (fam == AF_INET6 &&
2824                     dest_is_loop &&
2825                     sifa->src_is_loop && sifa->src_is_priv) {
2826                         /*
2827                          * don't allow fe80::1 to be a src on loop ::1, we
2828                          * don't list it to the peer so we will get an
2829                          * abort.
2830                          */
2831                         continue;
2832                 }
2833                 if (fam == AF_INET6 &&
2834                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2835                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2836                         /*
2837                          * link-local <-> link-local must belong to the same
2838                          * scope.
2839                          */
2840                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2841                         (void)sa6_recoverscope(&lsa6);
2842                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2843                                 continue;
2844                         }
2845                 }
2846 #endif                          /* INET6 */
2847
2848                 /*
2849                  * Check if the IPv6 address matches to next-hop. In the
2850                  * mobile case, old IPv6 address may be not deleted from the
2851                  * interface. Then, the interface has previous and new
2852                  * addresses.  We should use one corresponding to the
2853                  * next-hop.  (by micchie)
2854                  */
2855 #ifdef INET6
2856                 if (stcb && fam == AF_INET6 &&
2857                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2858                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2859                             == 0) {
2860                                 continue;
2861                         }
2862                 }
2863 #endif
2864 #ifdef INET
2865                 /* Avoid topologically incorrect IPv4 address */
2866                 if (stcb && fam == AF_INET &&
2867                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2868                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2869                                 continue;
2870                         }
2871                 }
2872 #endif
2873                 if (stcb) {
2874                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2875                                 continue;
2876                         }
2877                         if (((non_asoc_addr_ok == 0) &&
2878                             (sctp_is_addr_restricted(stcb, sifa))) ||
2879                             (non_asoc_addr_ok &&
2880                             (sctp_is_addr_restricted(stcb, sifa)) &&
2881                             (!sctp_is_addr_pending(stcb, sifa)))) {
2882                                 /*
2883                                  * It is restricted for some reason..
2884                                  * probably not yet added.
2885                                  */
2886                                 continue;
2887                         }
2888                 }
2889                 if (num_eligible_addr >= addr_wanted) {
2890                         return (sifa);
2891                 }
2892                 num_eligible_addr++;
2893         }
2894         return (NULL);
2895 }
2896
2897
2898 static int
2899 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2900     struct sctp_inpcb *inp,
2901     struct sctp_tcb *stcb,
2902     int non_asoc_addr_ok,
2903     uint8_t dest_is_loop,
2904     uint8_t dest_is_priv,
2905     sa_family_t fam)
2906 {
2907         struct sctp_ifa *ifa, *sifa;
2908         int num_eligible_addr = 0;
2909
2910         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2911 #ifdef INET
2912                 if ((ifa->address.sa.sa_family == AF_INET) &&
2913                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2914                     &ifa->address.sin.sin_addr) != 0)) {
2915                         continue;
2916                 }
2917 #endif
2918 #ifdef INET6
2919                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2920                     (stcb != NULL) &&
2921                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2922                     &ifa->address.sin6.sin6_addr) != 0)) {
2923                         continue;
2924                 }
2925 #endif
2926                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2927                     (non_asoc_addr_ok == 0)) {
2928                         continue;
2929                 }
2930                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2931                     dest_is_priv, fam);
2932                 if (sifa == NULL) {
2933                         continue;
2934                 }
2935                 if (stcb) {
2936                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2937                                 continue;
2938                         }
2939                         if (((non_asoc_addr_ok == 0) &&
2940                             (sctp_is_addr_restricted(stcb, sifa))) ||
2941                             (non_asoc_addr_ok &&
2942                             (sctp_is_addr_restricted(stcb, sifa)) &&
2943                             (!sctp_is_addr_pending(stcb, sifa)))) {
2944                                 /*
2945                                  * It is restricted for some reason..
2946                                  * probably not yet added.
2947                                  */
2948                                 continue;
2949                         }
2950                 }
2951                 num_eligible_addr++;
2952         }
2953         return (num_eligible_addr);
2954 }
2955
2956 static struct sctp_ifa *
2957 sctp_choose_boundall(struct sctp_inpcb *inp,
2958     struct sctp_tcb *stcb,
2959     struct sctp_nets *net,
2960     sctp_route_t *ro,
2961     uint32_t vrf_id,
2962     uint8_t dest_is_priv,
2963     uint8_t dest_is_loop,
2964     int non_asoc_addr_ok,
2965     sa_family_t fam)
2966 {
2967         int cur_addr_num = 0, num_preferred = 0;
2968         void *ifn;
2969         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2970         struct sctp_ifa *sctp_ifa, *sifa;
2971         uint32_t ifn_index;
2972         struct sctp_vrf *vrf;
2973 #ifdef INET
2974         int retried = 0;
2975 #endif
2976
2977         /*-
2978          * For boundall we can use any address in the association.
2979          * If non_asoc_addr_ok is set we can use any address (at least in
2980          * theory). So we look for preferred addresses first. If we find one,
2981          * we use it. Otherwise we next try to get an address on the
2982          * interface, which we should be able to do (unless non_asoc_addr_ok
2983          * is false and we are routed out that way). In these cases where we
2984          * can't use the address of the interface we go through all the
2985          * ifn's looking for an address we can use and fill that in. Punting
2986          * means we send back address 0, which will probably cause problems
2987          * actually since then IP will fill in the address of the route ifn,
2988          * which means we probably already rejected it.. i.e. here comes an
2989          * abort :-<.
2990          */
2991         vrf = sctp_find_vrf(vrf_id);
2992         if (vrf == NULL)
2993                 return (NULL);
2994
2995         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2996         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2997         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2998         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2999         if (sctp_ifn == NULL) {
3000                 /* ?? We don't have this guy ?? */
3001                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3002                 goto bound_all_plan_b;
3003         }
3004         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3005             ifn_index, sctp_ifn->ifn_name);
3006
3007         if (net) {
3008                 cur_addr_num = net->indx_of_eligible_next_to_use;
3009         }
3010         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3011             inp, stcb,
3012             non_asoc_addr_ok,
3013             dest_is_loop,
3014             dest_is_priv, fam);
3015         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3016             num_preferred, sctp_ifn->ifn_name);
3017         if (num_preferred == 0) {
3018                 /*
3019                  * no eligible addresses, we must use some other interface
3020                  * address if we can find one.
3021                  */
3022                 goto bound_all_plan_b;
3023         }
3024         /*
3025          * Ok we have num_eligible_addr set with how many we can use, this
3026          * may vary from call to call due to addresses being deprecated
3027          * etc..
3028          */
3029         if (cur_addr_num >= num_preferred) {
3030                 cur_addr_num = 0;
3031         }
3032         /*
3033          * select the nth address from the list (where cur_addr_num is the
3034          * nth) and 0 is the first one, 1 is the second one etc...
3035          */
3036         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3037
3038         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3039             dest_is_priv, cur_addr_num, fam, ro);
3040
3041         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3042         if (sctp_ifa) {
3043                 atomic_add_int(&sctp_ifa->refcount, 1);
3044                 if (net) {
3045                         /* save off where the next one we will want */
3046                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3047                 }
3048                 return (sctp_ifa);
3049         }
3050         /*
3051          * plan_b: Look at all interfaces and find a preferred address. If
3052          * no preferred fall through to plan_c.
3053          */
3054 bound_all_plan_b:
3055         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3056         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3057                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3058                     sctp_ifn->ifn_name);
3059                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3060                         /* wrong base scope */
3061                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3062                         continue;
3063                 }
3064                 if ((sctp_ifn == looked_at) && looked_at) {
3065                         /* already looked at this guy */
3066                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3067                         continue;
3068                 }
3069                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3070                     dest_is_loop, dest_is_priv, fam);
3071                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3072                     "Found ifn:%p %d preferred source addresses\n",
3073                     ifn, num_preferred);
3074                 if (num_preferred == 0) {
3075                         /* None on this interface. */
3076                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3077                         continue;
3078                 }
3079                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3080                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3081                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3082
3083                 /*
3084                  * Ok we have num_eligible_addr set with how many we can
3085                  * use, this may vary from call to call due to addresses
3086                  * being deprecated etc..
3087                  */
3088                 if (cur_addr_num >= num_preferred) {
3089                         cur_addr_num = 0;
3090                 }
3091                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3092                     dest_is_priv, cur_addr_num, fam, ro);
3093                 if (sifa == NULL)
3094                         continue;
3095                 if (net) {
3096                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3098                             cur_addr_num);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3101                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3102                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3103                 }
3104                 atomic_add_int(&sifa->refcount, 1);
3105                 return (sifa);
3106         }
3107 #ifdef INET
3108 again_with_private_addresses_allowed:
3109 #endif
3110         /* plan_c: do we have an acceptable address on the emit interface */
3111         sifa = NULL;
3112         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3113         if (emit_ifn == NULL) {
3114                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3115                 goto plan_d;
3116         }
3117         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3118                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3119 #ifdef INET
3120                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3121                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3122                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3123                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3124                         continue;
3125                 }
3126 #endif
3127 #ifdef INET6
3128                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3129                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3130                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3132                         continue;
3133                 }
3134 #endif
3135                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3136                     (non_asoc_addr_ok == 0)) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3138                         continue;
3139                 }
3140                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3141                     dest_is_priv, fam);
3142                 if (sifa == NULL) {
3143                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3144                         continue;
3145                 }
3146                 if (stcb) {
3147                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3148                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3149                                 sifa = NULL;
3150                                 continue;
3151                         }
3152                         if (((non_asoc_addr_ok == 0) &&
3153                             (sctp_is_addr_restricted(stcb, sifa))) ||
3154                             (non_asoc_addr_ok &&
3155                             (sctp_is_addr_restricted(stcb, sifa)) &&
3156                             (!sctp_is_addr_pending(stcb, sifa)))) {
3157                                 /*
3158                                  * It is restricted for some reason..
3159                                  * probably not yet added.
3160                                  */
3161                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3162                                 sifa = NULL;
3163                                 continue;
3164                         }
3165                 }
3166                 atomic_add_int(&sifa->refcount, 1);
3167                 goto out;
3168         }
3169 plan_d:
3170         /*
3171          * plan_d: We are in trouble. No preferred address on the emit
3172          * interface. And not even a preferred address on all interfaces. Go
3173          * out and see if we can find an acceptable address somewhere
3174          * amongst all interfaces.
3175          */
3176         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179                         /* wrong base scope */
3180                         continue;
3181                 }
3182                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183 #ifdef INET
3184                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3187                                 continue;
3188                         }
3189 #endif
3190 #ifdef INET6
3191                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194                                 continue;
3195                         }
3196 #endif
3197                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198                             (non_asoc_addr_ok == 0))
3199                                 continue;
3200                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201                             dest_is_loop,
3202                             dest_is_priv, fam);
3203                         if (sifa == NULL)
3204                                 continue;
3205                         if (stcb) {
3206                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207                                         sifa = NULL;
3208                                         continue;
3209                                 }
3210                                 if (((non_asoc_addr_ok == 0) &&
3211                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3212                                     (non_asoc_addr_ok &&
3213                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3214                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3215                                         /*
3216                                          * It is restricted for some
3217                                          * reason.. probably not yet added.
3218                                          */
3219                                         sifa = NULL;
3220                                         continue;
3221                                 }
3222                         }
3223                         goto out;
3224                 }
3225         }
3226 #ifdef INET
3227         if (stcb) {
3228                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3229                         stcb->asoc.scope.ipv4_local_scope = 1;
3230                         retried = 1;
3231                         goto again_with_private_addresses_allowed;
3232                 } else if (retried == 1) {
3233                         stcb->asoc.scope.ipv4_local_scope = 0;
3234                 }
3235         }
3236 #endif
3237 out:
3238 #ifdef INET
3239         if (sifa) {
3240                 if (retried == 1) {
3241                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3242                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3243                                         /* wrong base scope */
3244                                         continue;
3245                                 }
3246                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3247                                         struct sctp_ifa *tmp_sifa;
3248
3249 #ifdef INET
3250                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3251                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3252                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3253                                                 continue;
3254                                         }
3255 #endif
3256 #ifdef INET6
3257                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3258                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3259                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3260                                                 continue;
3261                                         }
3262 #endif
3263                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3264                                             (non_asoc_addr_ok == 0))
3265                                                 continue;
3266                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3267                                             dest_is_loop,
3268                                             dest_is_priv, fam);
3269                                         if (tmp_sifa == NULL) {
3270                                                 continue;
3271                                         }
3272                                         if (tmp_sifa == sifa) {
3273                                                 continue;
3274                                         }
3275                                         if (stcb) {
3276                                                 if (sctp_is_address_in_scope(tmp_sifa,
3277                                                     &stcb->asoc.scope, 0) == 0) {
3278                                                         continue;
3279                                                 }
3280                                                 if (((non_asoc_addr_ok == 0) &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3282                                                     (non_asoc_addr_ok &&
3283                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3284                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3285                                                         /*
3286                                                          * It is restricted
3287                                                          * for some reason..
3288                                                          * probably not yet
3289                                                          * added.
3290                                                          */
3291                                                         continue;
3292                                                 }
3293                                         }
3294                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3295                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3296                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3297                                         }
3298                                 }
3299                         }
3300                 }
3301                 atomic_add_int(&sifa->refcount, 1);
3302         }
3303 #endif
3304         return (sifa);
3305 }
3306
3307
3308
3309 /* tcb may be NULL */
3310 struct sctp_ifa *
3311 sctp_source_address_selection(struct sctp_inpcb *inp,
3312     struct sctp_tcb *stcb,
3313     sctp_route_t *ro,
3314     struct sctp_nets *net,
3315     int non_asoc_addr_ok, uint32_t vrf_id)
3316 {
3317         struct sctp_ifa *answer;
3318         uint8_t dest_is_priv, dest_is_loop;
3319         sa_family_t fam;
3320 #ifdef INET
3321         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325 #endif
3326
3327         /**
3328          * Rules:
3329          * - Find the route if needed, cache if I can.
3330          * - Look at interface address in route, Is it in the bound list. If so we
3331          *   have the best source.
3332          * - If not we must rotate amongst the addresses.
3333          *
3334          * Cavets and issues
3335          *
3336          * Do we need to pay attention to scope. We can have a private address
3337          * or a global address we are sourcing or sending to. So if we draw
3338          * it out
3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340          * For V4
3341          * ------------------------------------------
3342          *      source     *      dest  *  result
3343          * -----------------------------------------
3344          * <a>  Private    *    Global  *  NAT
3345          * -----------------------------------------
3346          * <b>  Private    *    Private *  No problem
3347          * -----------------------------------------
3348          * <c>  Global     *    Private *  Huh, How will this work?
3349          * -----------------------------------------
3350          * <d>  Global     *    Global  *  No Problem
3351          *------------------------------------------
3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353          * For V6
3354          *------------------------------------------
3355          *      source     *      dest  *  result
3356          * -----------------------------------------
3357          * <a>  Linklocal  *    Global  *
3358          * -----------------------------------------
3359          * <b>  Linklocal  * Linklocal  *  No problem
3360          * -----------------------------------------
3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
3362          * -----------------------------------------
3363          * <d>  Global     *    Global  *  No Problem
3364          *------------------------------------------
3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366          *
3367          * And then we add to that what happens if there are multiple addresses
3368          * assigned to an interface. Remember the ifa on a ifn is a linked
3369          * list of addresses. So one interface can have more than one IP
3370          * address. What happens if we have both a private and a global
3371          * address? Do we then use context of destination to sort out which
3372          * one is best? And what about NAT's sending P->G may get you a NAT
3373          * translation, or should you select the G thats on the interface in
3374          * preference.
3375          *
3376          * Decisions:
3377          *
3378          * - count the number of addresses on the interface.
3379          * - if it is one, no problem except case <c>.
3380          *   For <a> we will assume a NAT out there.
3381          * - if there are more than one, then we need to worry about scope P
3382          *   or G. We should prefer G -> G and P -> P if possible.
3383          *   Then as a secondary fall back to mixed types G->P being a last
3384          *   ditch one.
3385          * - The above all works for bound all, but bound specific we need to
3386          *   use the same concept but instead only consider the bound
3387          *   addresses. If the bound set is NOT assigned to the interface then
3388          *   we must use rotation amongst the bound addresses..
3389          */
3390         if (ro->ro_rt == NULL) {
3391                 /*
3392                  * Need a route to cache.
3393                  */
3394                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3395         }
3396         if (ro->ro_rt == NULL) {
3397                 return (NULL);
3398         }
3399         fam = ro->ro_dst.sa_family;
3400         dest_is_priv = dest_is_loop = 0;
3401         /* Setup our scopes for the destination */
3402         switch (fam) {
3403 #ifdef INET
3404         case AF_INET:
3405                 /* Scope based on outbound address */
3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407                         dest_is_loop = 1;
3408                         if (net != NULL) {
3409                                 /* mark it as local */
3410                                 net->addr_is_local = 1;
3411                         }
3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413                         dest_is_priv = 1;
3414                 }
3415                 break;
3416 #endif
3417 #ifdef INET6
3418         case AF_INET6:
3419                 /* Scope based on outbound address */
3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422                         /*
3423                          * If the address is a loopback address, which
3424                          * consists of "::1" OR "fe80::1%lo0", we are
3425                          * loopback scope. But we don't use dest_is_priv
3426                          * (link local addresses).
3427                          */
3428                         dest_is_loop = 1;
3429                         if (net != NULL) {
3430                                 /* mark it as local */
3431                                 net->addr_is_local = 1;
3432                         }
3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434                         dest_is_priv = 1;
3435                 }
3436                 break;
3437 #endif
3438         }
3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441         SCTP_IPI_ADDR_RLOCK();
3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443                 /*
3444                  * Bound all case
3445                  */
3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447                     dest_is_priv, dest_is_loop,
3448                     non_asoc_addr_ok, fam);
3449                 SCTP_IPI_ADDR_RUNLOCK();
3450                 return (answer);
3451         }
3452         /*
3453          * Subset bound case
3454          */
3455         if (stcb) {
3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457                     vrf_id, dest_is_priv,
3458                     dest_is_loop,
3459                     non_asoc_addr_ok, fam);
3460         } else {
3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462                     non_asoc_addr_ok,
3463                     dest_is_priv,
3464                     dest_is_loop, fam);
3465         }
3466         SCTP_IPI_ADDR_RUNLOCK();
3467         return (answer);
3468 }
3469
3470 static int
3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472 {
3473         struct cmsghdr cmh;
3474         struct sctp_sndinfo sndinfo;
3475         struct sctp_prinfo prinfo;
3476         struct sctp_authinfo authinfo;
3477         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3478         int found;
3479
3480         /*
3481          * Independent of how many mbufs, find the c_type inside the control
3482          * structure and copy out the data.
3483          */
3484         found = 0;
3485         tot_len = SCTP_BUF_LEN(control);
3486         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3487                 rem_len = tot_len - off;
3488                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3489                         /* There is not enough room for one more. */
3490                         return (found);
3491                 }
3492                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494                         /* We dont't have a complete CMSG header. */
3495                         return (found);
3496                 }
3497                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3498                         /* We don't have the complete CMSG. */
3499                         return (found);
3500                 }
3501                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3502                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3503                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3504                     ((c_type == cmh.cmsg_type) ||
3505                     ((c_type == SCTP_SNDRCV) &&
3506                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3507                     (cmh.cmsg_type == SCTP_PRINFO) ||
3508                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3509                         if (c_type == cmh.cmsg_type) {
3510                                 if (cpsize > INT_MAX) {
3511                                         return (found);
3512                                 }
3513                                 if (cmsg_data_len < (int)cpsize) {
3514                                         return (found);
3515                                 }
3516                                 /* It is exactly what we want. Copy it out. */
3517                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3518                                 return (1);
3519                         } else {
3520                                 struct sctp_sndrcvinfo *sndrcvinfo;
3521
3522                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3523                                 if (found == 0) {
3524                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3525                                                 return (found);
3526                                         }
3527                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3528                                 }
3529                                 switch (cmh.cmsg_type) {
3530                                 case SCTP_SNDINFO:
3531                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3532                                                 return (found);
3533                                         }
3534                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3535                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3536                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3537                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3538                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3539                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3540                                         break;
3541                                 case SCTP_PRINFO:
3542                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3546                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3547                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3548                                         } else {
3549                                                 sndrcvinfo->sinfo_timetolive = 0;
3550                                         }
3551                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3552                                         break;
3553                                 case SCTP_AUTHINFO:
3554                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3555                                                 return (found);
3556                                         }
3557                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3558                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3559                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3560                                         break;
3561                                 default:
3562                                         return (found);
3563                                 }
3564                                 found = 1;
3565                         }
3566                 }
3567         }
3568         return (found);
3569 }
3570
3571 static int
3572 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3573 {
3574         struct cmsghdr cmh;
3575         int tlen, at;
3576         struct sctp_initmsg initmsg;
3577 #ifdef INET
3578         struct sockaddr_in sin;
3579 #endif
3580 #ifdef INET6
3581         struct sockaddr_in6 sin6;
3582 #endif
3583
3584         tlen = SCTP_BUF_LEN(control);
3585         at = 0;
3586         while (at < tlen) {
3587                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3588                         /* There is not enough room for one more. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3593                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3594                         /* We dont't have a complete CMSG header. */
3595                         *error = EINVAL;
3596                         return (1);
3597                 }
3598                 if (((int)cmh.cmsg_len + at) > tlen) {
3599                         /* We don't have the complete CMSG. */
3600                         *error = EINVAL;
3601                         return (1);
3602                 }
3603                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3604                         switch (cmh.cmsg_type) {
3605                         case SCTP_INIT:
3606                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3607                                         *error = EINVAL;
3608                                         return (1);
3609                                 }
3610                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3611                                 if (initmsg.sinit_max_attempts)
3612                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3613                                 if (initmsg.sinit_num_ostreams)
3614                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3615                                 if (initmsg.sinit_max_instreams)
3616                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3617                                 if (initmsg.sinit_max_init_timeo)
3618                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3619                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3620                                         struct sctp_stream_out *tmp_str;
3621                                         unsigned int i;
3622 #if defined(SCTP_DETAILED_STR_STATS)
3623                                         int j;
3624 #endif
3625
3626                                         /* Default is NOT correct */
3627                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3628                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3629                                         SCTP_TCB_UNLOCK(stcb);
3630                                         SCTP_MALLOC(tmp_str,
3631                                             struct sctp_stream_out *,
3632                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3633                                             SCTP_M_STRMO);
3634                                         SCTP_TCB_LOCK(stcb);
3635                                         if (tmp_str != NULL) {
3636                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3637                                                 stcb->asoc.strmout = tmp_str;
3638                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3639                                         } else {
3640                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3641                                         }
3642                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3643                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3644                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3645                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3646                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3647 #if defined(SCTP_DETAILED_STR_STATS)
3648                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3649                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3650                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3651                                                 }
3652 #else
3653                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3654                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3655 #endif
3656                                                 stcb->asoc.strmout[i].sid = i;
3657                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3658                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3659                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3660                                         }
3661                                 }
3662                                 break;
3663 #ifdef INET
3664                         case SCTP_DSTADDRV4:
3665                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3670                                 sin.sin_family = AF_INET;
3671                                 sin.sin_len = sizeof(struct sockaddr_in);
3672                                 sin.sin_port = stcb->rport;
3673                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3674                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3675                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3676                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3677                                         *error = EINVAL;
3678                                         return (1);
3679                                 }
3680                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3681                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3682                                         *error = ENOBUFS;
3683                                         return (1);
3684                                 }
3685                                 break;
3686 #endif
3687 #ifdef INET6
3688                         case SCTP_DSTADDRV6:
3689                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3690                                         *error = EINVAL;
3691                                         return (1);
3692                                 }
3693                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3694                                 sin6.sin6_family = AF_INET6;
3695                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3696                                 sin6.sin6_port = stcb->rport;
3697                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3698                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3699                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3700                                         *error = EINVAL;
3701                                         return (1);
3702                                 }
3703 #ifdef INET
3704                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3705                                         in6_sin6_2_sin(&sin, &sin6);
3706                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3707                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3708                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3709                                                 *error = EINVAL;
3710                                                 return (1);
3711                                         }
3712                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3713                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3714                                                 *error = ENOBUFS;
3715                                                 return (1);
3716                                         }
3717                                 } else
3718 #endif
3719                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3720                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3721                                         *error = ENOBUFS;
3722                                         return (1);
3723                                 }
3724                                 break;
3725 #endif
3726                         default:
3727                                 break;
3728                         }
3729                 }
3730                 at += CMSG_ALIGN(cmh.cmsg_len);
3731         }
3732         return (0);
3733 }
3734
3735 static struct sctp_tcb *
3736 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3737     uint16_t port,
3738     struct mbuf *control,
3739     struct sctp_nets **net_p,
3740     int *error)
3741 {
3742         struct cmsghdr cmh;
3743         int tlen, at;
3744         struct sctp_tcb *stcb;
3745         struct sockaddr *addr;
3746 #ifdef INET
3747         struct sockaddr_in sin;
3748 #endif
3749 #ifdef INET6
3750         struct sockaddr_in6 sin6;
3751 #endif
3752
3753         tlen = SCTP_BUF_LEN(control);
3754         at = 0;
3755         while (at < tlen) {
3756                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3757                         /* There is not enough room for one more. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3762                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3763                         /* We dont't have a complete CMSG header. */
3764                         *error = EINVAL;
3765                         return (NULL);
3766                 }
3767                 if (((int)cmh.cmsg_len + at) > tlen) {
3768                         /* We don't have the complete CMSG. */
3769                         *error = EINVAL;
3770                         return (NULL);
3771                 }
3772                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3773                         switch (cmh.cmsg_type) {
3774 #ifdef INET
3775                         case SCTP_DSTADDRV4:
3776                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3777                                         *error = EINVAL;
3778                                         return (NULL);
3779                                 }
3780                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3781                                 sin.sin_family = AF_INET;
3782                                 sin.sin_len = sizeof(struct sockaddr_in);
3783                                 sin.sin_port = port;
3784                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3785                                 addr = (struct sockaddr *)&sin;
3786                                 break;
3787 #endif
3788 #ifdef INET6
3789                         case SCTP_DSTADDRV6:
3790                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3791                                         *error = EINVAL;
3792                                         return (NULL);
3793                                 }
3794                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3795                                 sin6.sin6_family = AF_INET6;
3796                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3797                                 sin6.sin6_port = port;
3798                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3799 #ifdef INET
3800                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3801                                         in6_sin6_2_sin(&sin, &sin6);
3802                                         addr = (struct sockaddr *)&sin;
3803                                 } else
3804 #endif
3805                                         addr = (struct sockaddr *)&sin6;
3806                                 break;
3807 #endif
3808                         default:
3809                                 addr = NULL;
3810                                 break;
3811                         }
3812                         if (addr) {
3813                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3814                                 if (stcb != NULL) {
3815                                         return (stcb);
3816                                 }
3817                         }
3818                 }
3819                 at += CMSG_ALIGN(cmh.cmsg_len);
3820         }
3821         return (NULL);
3822 }
3823
3824 static struct mbuf *
3825 sctp_add_cookie(struct mbuf *init, int init_offset,
3826     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3827 {
3828         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3829         struct sctp_state_cookie *stc;
3830         struct sctp_paramhdr *ph;
3831         uint8_t *foo;
3832         int sig_offset;
3833         uint16_t cookie_sz;
3834
3835         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3836             sizeof(struct sctp_paramhdr)), 0,
3837             M_NOWAIT, 1, MT_DATA);
3838         if (mret == NULL) {
3839                 return (NULL);
3840         }
3841         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3842         if (copy_init == NULL) {
3843                 sctp_m_freem(mret);
3844                 return (NULL);
3845         }
3846 #ifdef SCTP_MBUF_LOGGING
3847         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3848                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3849         }
3850 #endif
3851         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3852             M_NOWAIT);
3853         if (copy_initack == NULL) {
3854                 sctp_m_freem(mret);
3855                 sctp_m_freem(copy_init);
3856                 return (NULL);
3857         }
3858 #ifdef SCTP_MBUF_LOGGING
3859         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3860                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3861         }
3862 #endif
3863         /* easy side we just drop it on the end */
3864         ph = mtod(mret, struct sctp_paramhdr *);
3865         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3866             sizeof(struct sctp_paramhdr);
3867         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3868             sizeof(struct sctp_paramhdr));
3869         ph->param_type = htons(SCTP_STATE_COOKIE);
3870         ph->param_length = 0;   /* fill in at the end */
3871         /* Fill in the stc cookie data */
3872         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3873
3874         /* tack the INIT and then the INIT-ACK onto the chain */
3875         cookie_sz = 0;
3876         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3877                 cookie_sz += SCTP_BUF_LEN(m_at);
3878                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3879                         SCTP_BUF_NEXT(m_at) = copy_init;
3880                         break;
3881                 }
3882         }
3883         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3884                 cookie_sz += SCTP_BUF_LEN(m_at);
3885                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3886                         SCTP_BUF_NEXT(m_at) = copy_initack;
3887                         break;
3888                 }
3889         }
3890         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3891                 cookie_sz += SCTP_BUF_LEN(m_at);
3892                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3893                         break;
3894                 }
3895         }
3896         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3897         if (sig == NULL) {
3898                 /* no space, so free the entire chain */
3899                 sctp_m_freem(mret);
3900                 return (NULL);
3901         }
3902         SCTP_BUF_LEN(sig) = 0;
3903         SCTP_BUF_NEXT(m_at) = sig;
3904         sig_offset = 0;
3905         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3906         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3907         *signature = foo;
3908         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3909         cookie_sz += SCTP_SIGNATURE_SIZE;
3910         ph->param_length = htons(cookie_sz);
3911         return (mret);
3912 }
3913
3914
3915 static uint8_t
3916 sctp_get_ect(struct sctp_tcb *stcb)
3917 {
3918         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3919                 return (SCTP_ECT0_BIT);
3920         } else {
3921                 return (0);
3922         }
3923 }
3924
3925 #if defined(INET) || defined(INET6)
3926 static void
3927 sctp_handle_no_route(struct sctp_tcb *stcb,
3928     struct sctp_nets *net,
3929     int so_locked)
3930 {
3931         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3932
3933         if (net) {
3934                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3935                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3936                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3937                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3938                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3939                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3940                                     stcb, 0,
3941                                     (void *)net,
3942                                     so_locked);
3943                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3944                                 net->dest_state &= ~SCTP_ADDR_PF;
3945                         }
3946                 }
3947                 if (stcb) {
3948                         if (net == stcb->asoc.primary_destination) {
3949                                 /* need a new primary */
3950                                 struct sctp_nets *alt;
3951
3952                                 alt = sctp_find_alternate_net(stcb, net, 0);
3953                                 if (alt != net) {
3954                                         if (stcb->asoc.alternate) {
3955                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3956                                         }
3957                                         stcb->asoc.alternate = alt;
3958                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3959                                         if (net->ro._s_addr) {
3960                                                 sctp_free_ifa(net->ro._s_addr);
3961                                                 net->ro._s_addr = NULL;
3962                                         }
3963                                         net->src_addr_selected = 0;
3964                                 }
3965                         }
3966                 }
3967         }
3968 }
3969 #endif
3970
3971 static int
3972 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3973     struct sctp_tcb *stcb,      /* may be NULL */
3974     struct sctp_nets *net,
3975     struct sockaddr *to,
3976     struct mbuf *m,
3977     uint32_t auth_offset,
3978     struct sctp_auth_chunk *auth,
3979     uint16_t auth_keyid,
3980     int nofragment_flag,
3981     int ecn_ok,
3982     int out_of_asoc_ok,
3983     uint16_t src_port,
3984     uint16_t dest_port,
3985     uint32_t v_tag,
3986     uint16_t port,
3987     union sctp_sockstore *over_addr,
3988     uint8_t mflowtype, uint32_t mflowid,
3989 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3990     int so_locked SCTP_UNUSED
3991 #else
3992     int so_locked
3993 #endif
3994 )
3995 {
3996 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3997         /**
3998          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3999          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4000          * - fill in the HMAC digest of any AUTH chunk in the packet.
4001          * - calculate and fill in the SCTP checksum.
4002          * - prepend an IP address header.
4003          * - if boundall use INADDR_ANY.
4004          * - if boundspecific do source address selection.
4005          * - set fragmentation option for ipV4.
4006          * - On return from IP output, check/adjust mtu size of output
4007          *   interface and smallest_mtu size as well.
4008          */
4009         /* Will need ifdefs around this */
4010         struct mbuf *newm;
4011         struct sctphdr *sctphdr;
4012         int packet_length;
4013         int ret;
4014 #if defined(INET) || defined(INET6)
4015         uint32_t vrf_id;
4016 #endif
4017 #if defined(INET) || defined(INET6)
4018         struct mbuf *o_pak;
4019         sctp_route_t *ro = NULL;
4020         struct udphdr *udp = NULL;
4021 #endif
4022         uint8_t tos_value;
4023 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4024         struct socket *so = NULL;
4025 #endif
4026
4027         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4028                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4029                 sctp_m_freem(m);
4030                 return (EFAULT);
4031         }
4032 #if defined(INET) || defined(INET6)
4033         if (stcb) {
4034                 vrf_id = stcb->asoc.vrf_id;
4035         } else {
4036                 vrf_id = inp->def_vrf_id;
4037         }
4038 #endif
4039         /* fill in the HMAC digest for any AUTH chunk in the packet */
4040         if ((auth != NULL) && (stcb != NULL)) {
4041                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4042         }
4043
4044         if (net) {
4045                 tos_value = net->dscp;
4046         } else if (stcb) {
4047                 tos_value = stcb->asoc.default_dscp;
4048         } else {
4049                 tos_value = inp->sctp_ep.default_dscp;
4050         }
4051
4052         switch (to->sa_family) {
4053 #ifdef INET
4054         case AF_INET:
4055                 {
4056                         struct ip *ip = NULL;
4057                         sctp_route_t iproute;
4058                         int len;
4059
4060                         len = SCTP_MIN_V4_OVERHEAD;
4061                         if (port) {
4062                                 len += sizeof(struct udphdr);
4063                         }
4064                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4065                         if (newm == NULL) {
4066                                 sctp_m_freem(m);
4067                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4068                                 return (ENOMEM);
4069                         }
4070                         SCTP_ALIGN_TO_END(newm, len);
4071                         SCTP_BUF_LEN(newm) = len;
4072                         SCTP_BUF_NEXT(newm) = m;
4073                         m = newm;
4074                         if (net != NULL) {
4075                                 m->m_pkthdr.flowid = net->flowid;
4076                                 M_HASHTYPE_SET(m, net->flowtype);
4077                         } else {
4078                                 m->m_pkthdr.flowid = mflowid;
4079                                 M_HASHTYPE_SET(m, mflowtype);
4080                         }
4081                         packet_length = sctp_calculate_len(m);
4082                         ip = mtod(m, struct ip *);
4083                         ip->ip_v = IPVERSION;
4084                         ip->ip_hl = (sizeof(struct ip) >> 2);
4085                         if (tos_value == 0) {
4086                                 /*
4087                                  * This means especially, that it is not set
4088                                  * at the SCTP layer. So use the value from
4089                                  * the IP layer.
4090                                  */
4091                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4092                         }
4093                         tos_value &= 0xfc;
4094                         if (ecn_ok) {
4095                                 tos_value |= sctp_get_ect(stcb);
4096                         }
4097                         if ((nofragment_flag) && (port == 0)) {
4098                                 ip->ip_off = htons(IP_DF);
4099                         } else {
4100                                 ip->ip_off = htons(0);
4101                         }
4102                         /* FreeBSD has a function for ip_id's */
4103                         ip_fillid(ip);
4104
4105                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4106                         ip->ip_len = htons(packet_length);
4107                         ip->ip_tos = tos_value;
4108                         if (port) {
4109                                 ip->ip_p = IPPROTO_UDP;
4110                         } else {
4111                                 ip->ip_p = IPPROTO_SCTP;
4112                         }
4113                         ip->ip_sum = 0;
4114                         if (net == NULL) {
4115                                 ro = &iproute;
4116                                 memset(&iproute, 0, sizeof(iproute));
4117                                 memcpy(&ro->ro_dst, to, to->sa_len);
4118                         } else {
4119                                 ro = (sctp_route_t *)&net->ro;
4120                         }
4121                         /* Now the address selection part */
4122                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4123
4124                         /* call the routine to select the src address */
4125                         if (net && out_of_asoc_ok == 0) {
4126                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4127                                         sctp_free_ifa(net->ro._s_addr);
4128                                         net->ro._s_addr = NULL;
4129                                         net->src_addr_selected = 0;
4130                                         if (ro->ro_rt) {
4131                                                 RTFREE(ro->ro_rt);
4132                                                 ro->ro_rt = NULL;
4133                                         }
4134                                 }
4135                                 if (net->src_addr_selected == 0) {
4136                                         /* Cache the source address */
4137                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4138                                             ro, net, 0,
4139                                             vrf_id);
4140                                         net->src_addr_selected = 1;
4141                                 }
4142                                 if (net->ro._s_addr == NULL) {
4143                                         /* No route to host */
4144                                         net->src_addr_selected = 0;
4145                                         sctp_handle_no_route(stcb, net, so_locked);
4146                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4147                                         sctp_m_freem(m);
4148                                         return (EHOSTUNREACH);
4149                                 }
4150                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4151                         } else {
4152                                 if (over_addr == NULL) {
4153                                         struct sctp_ifa *_lsrc;
4154
4155                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4156                                             net,
4157                                             out_of_asoc_ok,
4158                                             vrf_id);
4159                                         if (_lsrc == NULL) {
4160                                                 sctp_handle_no_route(stcb, net, so_locked);
4161                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4162                                                 sctp_m_freem(m);
4163                                                 return (EHOSTUNREACH);
4164                                         }
4165                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4166                                         sctp_free_ifa(_lsrc);
4167                                 } else {
4168                                         ip->ip_src = over_addr->sin.sin_addr;
4169                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4170                                 }
4171                         }
4172                         if (port) {
4173                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4174                                         sctp_handle_no_route(stcb, net, so_locked);
4175                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4176                                         sctp_m_freem(m);
4177                                         return (EHOSTUNREACH);
4178                                 }
4179                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4180                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4181                                 udp->uh_dport = port;
4182                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4183                                 if (V_udp_cksum) {
4184                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4185                                 } else {
4186                                         udp->uh_sum = 0;
4187                                 }
4188                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4189                         } else {
4190                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4191                         }
4192
4193                         sctphdr->src_port = src_port;
4194                         sctphdr->dest_port = dest_port;
4195                         sctphdr->v_tag = v_tag;
4196                         sctphdr->checksum = 0;
4197
4198                         /*
4199                          * If source address selection fails and we find no
4200                          * route then the ip_output should fail as well with
4201                          * a NO_ROUTE_TO_HOST type error. We probably should
4202                          * catch that somewhere and abort the association
4203                          * right away (assuming this is an INIT being sent).
4204                          */
4205                         if (ro->ro_rt == NULL) {
4206                                 /*
4207                                  * src addr selection failed to find a route
4208                                  * (or valid source addr), so we can't get
4209                                  * there from here (yet)!
4210                                  */
4211                                 sctp_handle_no_route(stcb, net, so_locked);
4212                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4213                                 sctp_m_freem(m);
4214                                 return (EHOSTUNREACH);
4215                         }
4216                         if (ro != &iproute) {
4217                                 memcpy(&iproute, ro, sizeof(*ro));
4218                         }
4219                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4220                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4221                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4222                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4224                             (void *)ro->ro_rt);
4225
4226                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4227                                 /* failed to prepend data, give up */
4228                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4229                                 sctp_m_freem(m);
4230                                 return (ENOMEM);
4231                         }
4232                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4233                         if (port) {
4234                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4235                                 SCTP_STAT_INCR(sctps_sendswcrc);
4236                                 if (V_udp_cksum) {
4237                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4238                                 }
4239                         } else {
4240                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4241                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4242                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4243                         }
4244 #ifdef SCTP_PACKET_LOGGING
4245                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4246                                 sctp_packet_log(o_pak);
4247 #endif
4248                         /* send it out.  table id is taken from stcb */
4249 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4250                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4251                                 so = SCTP_INP_SO(inp);
4252                                 SCTP_SOCKET_UNLOCK(so, 0);
4253                         }
4254 #endif
4255                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4256                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4258                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4259                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4260                                 SCTP_TCB_UNLOCK(stcb);
4261                                 SCTP_SOCKET_LOCK(so, 0);
4262                                 SCTP_TCB_LOCK(stcb);
4263                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4264                         }
4265 #endif
4266                         SCTP_STAT_INCR(sctps_sendpackets);
4267                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4268                         if (ret)
4269                                 SCTP_STAT_INCR(sctps_senderrors);
4270
4271                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4272                         if (net == NULL) {
4273                                 /* free tempy routes */
4274                                 RO_RTFREE(ro);
4275                         } else {
4276                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4277                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4278                                         uint32_t mtu;
4279
4280                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4281                                         if (mtu > 0) {
4282                                                 if (net->port) {
4283                                                         mtu -= sizeof(struct udphdr);
4284                                                 }
4285                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4286                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4287                                                 }
4288                                                 net->mtu = mtu;
4289                                         }
4290                                 } else if (ro->ro_rt == NULL) {
4291                                         /* route was freed */
4292                                         if (net->ro._s_addr &&
4293                                             net->src_addr_selected) {
4294                                                 sctp_free_ifa(net->ro._s_addr);
4295                                                 net->ro._s_addr = NULL;
4296                                         }
4297                                         net->src_addr_selected = 0;
4298                                 }
4299                         }
4300                         return (ret);
4301                 }
4302 #endif
4303 #ifdef INET6
4304         case AF_INET6:
4305                 {
4306                         uint32_t flowlabel, flowinfo;
4307                         struct ip6_hdr *ip6h;
4308                         struct route_in6 ip6route;
4309                         struct ifnet *ifp;
4310                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4311                         int prev_scope = 0;
4312                         struct sockaddr_in6 lsa6_storage;
4313                         int error;
4314                         u_short prev_port = 0;
4315                         int len;
4316
4317                         if (net) {
4318                                 flowlabel = net->flowlabel;
4319                         } else if (stcb) {
4320                                 flowlabel = stcb->asoc.default_flowlabel;
4321                         } else {
4322                                 flowlabel = inp->sctp_ep.default_flowlabel;
4323                         }
4324                         if (flowlabel == 0) {
4325                                 /*
4326                                  * This means especially, that it is not set
4327                                  * at the SCTP layer. So use the value from
4328                                  * the IP layer.
4329                                  */
4330                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4331                         }
4332                         flowlabel &= 0x000fffff;
4333                         len = SCTP_MIN_OVERHEAD;
4334                         if (port) {
4335                                 len += sizeof(struct udphdr);
4336                         }
4337                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4338                         if (newm == NULL) {
4339                                 sctp_m_freem(m);
4340                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4341                                 return (ENOMEM);
4342                         }
4343                         SCTP_ALIGN_TO_END(newm, len);
4344                         SCTP_BUF_LEN(newm) = len;
4345                         SCTP_BUF_NEXT(newm) = m;
4346                         m = newm;
4347                         if (net != NULL) {
4348                                 m->m_pkthdr.flowid = net->flowid;
4349                                 M_HASHTYPE_SET(m, net->flowtype);
4350                         } else {
4351                                 m->m_pkthdr.flowid = mflowid;
4352                                 M_HASHTYPE_SET(m, mflowtype);
4353                         }
4354                         packet_length = sctp_calculate_len(m);
4355
4356                         ip6h = mtod(m, struct ip6_hdr *);
4357                         /* protect *sin6 from overwrite */
4358                         sin6 = (struct sockaddr_in6 *)to;
4359                         tmp = *sin6;
4360                         sin6 = &tmp;
4361
4362                         /* KAME hack: embed scopeid */
4363                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4364                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4365                                 return (EINVAL);
4366                         }
4367                         if (net == NULL) {
4368                                 memset(&ip6route, 0, sizeof(ip6route));
4369                                 ro = (sctp_route_t *)&ip6route;
4370                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4371                         } else {
4372                                 ro = (sctp_route_t *)&net->ro;
4373                         }
4374                         /*
4375                          * We assume here that inp_flow is in host byte
4376                          * order within the TCB!
4377                          */
4378                         if (tos_value == 0) {
4379                                 /*
4380                                  * This means especially, that it is not set
4381                                  * at the SCTP layer. So use the value from
4382                                  * the IP layer.
4383                                  */
4384                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4385                         }
4386                         tos_value &= 0xfc;
4387                         if (ecn_ok) {
4388                                 tos_value |= sctp_get_ect(stcb);
4389                         }
4390                         flowinfo = 0x06;
4391                         flowinfo <<= 8;
4392                         flowinfo |= tos_value;
4393                         flowinfo <<= 20;
4394                         flowinfo |= flowlabel;
4395                         ip6h->ip6_flow = htonl(flowinfo);
4396                         if (port) {
4397                                 ip6h->ip6_nxt = IPPROTO_UDP;
4398                         } else {
4399                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4400                         }
4401                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4402                         ip6h->ip6_dst = sin6->sin6_addr;
4403
4404                         /*
4405                          * Add SRC address selection here: we can only reuse
4406                          * to a limited degree the kame src-addr-sel, since
4407                          * we can try their selection but it may not be
4408                          * bound.
4409                          */
4410                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4411                         lsa6_tmp.sin6_family = AF_INET6;
4412                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4413                         lsa6 = &lsa6_tmp;
4414                         if (net && out_of_asoc_ok == 0) {
4415                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4416                                         sctp_free_ifa(net->ro._s_addr);
4417                                         net->ro._s_addr = NULL;
4418                                         net->src_addr_selected = 0;
4419                                         if (ro->ro_rt) {
4420                                                 RTFREE(ro->ro_rt);
4421                                                 ro->ro_rt = NULL;
4422                                         }
4423                                 }
4424                                 if (net->src_addr_selected == 0) {
4425                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4426                                         /* KAME hack: embed scopeid */
4427                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4428                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4429                                                 return (EINVAL);
4430                                         }
4431                                         /* Cache the source address */
4432                                         net->ro._s_addr = sctp_source_address_selection(inp,
4433                                             stcb,
4434                                             ro,
4435                                             net,
4436                                             0,
4437                                             vrf_id);
4438                                         (void)sa6_recoverscope(sin6);
4439                                         net->src_addr_selected = 1;
4440                                 }
4441                                 if (net->ro._s_addr == NULL) {
4442                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4443                                         net->src_addr_selected = 0;
4444                                         sctp_handle_no_route(stcb, net, so_locked);
4445                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4446                                         sctp_m_freem(m);
4447                                         return (EHOSTUNREACH);
4448                                 }
4449                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4450                         } else {
4451                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4452                                 /* KAME hack: embed scopeid */
4453                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4454                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4455                                         return (EINVAL);
4456                                 }
4457                                 if (over_addr == NULL) {
4458                                         struct sctp_ifa *_lsrc;
4459
4460                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4461                                             net,
4462                                             out_of_asoc_ok,
4463                                             vrf_id);
4464                                         if (_lsrc == NULL) {
4465                                                 sctp_handle_no_route(stcb, net, so_locked);
4466                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4467                                                 sctp_m_freem(m);
4468                                                 return (EHOSTUNREACH);
4469                                         }
4470                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4471                                         sctp_free_ifa(_lsrc);
4472                                 } else {
4473                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4474                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4475                                 }
4476                                 (void)sa6_recoverscope(sin6);
4477                         }
4478                         lsa6->sin6_port = inp->sctp_lport;
4479
4480                         if (ro->ro_rt == NULL) {
4481                                 /*
4482                                  * src addr selection failed to find a route
4483                                  * (or valid source addr), so we can't get
4484                                  * there from here!
4485                                  */
4486                                 sctp_handle_no_route(stcb, net, so_locked);
4487                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4488                                 sctp_m_freem(m);
4489                                 return (EHOSTUNREACH);
4490                         }
4491                         /*
4492                          * XXX: sa6 may not have a valid sin6_scope_id in
4493                          * the non-SCOPEDROUTING case.
4494                          */
4495                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4496                         lsa6_storage.sin6_family = AF_INET6;
4497                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4498                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4499                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4500                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4501                                 sctp_m_freem(m);
4502                                 return (error);
4503                         }
4504                         /* XXX */
4505                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4506                         lsa6_storage.sin6_port = inp->sctp_lport;
4507                         lsa6 = &lsa6_storage;
4508                         ip6h->ip6_src = lsa6->sin6_addr;
4509
4510                         if (port) {
4511                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4512                                         sctp_handle_no_route(stcb, net, so_locked);
4513                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4514                                         sctp_m_freem(m);
4515                                         return (EHOSTUNREACH);
4516                                 }
4517                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4518                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4519                                 udp->uh_dport = port;
4520                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4521                                 udp->uh_sum = 0;
4522                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4523                         } else {
4524                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4525                         }
4526
4527                         sctphdr->src_port = src_port;
4528                         sctphdr->dest_port = dest_port;
4529                         sctphdr->v_tag = v_tag;
4530                         sctphdr->checksum = 0;
4531
4532                         /*
4533                          * We set the hop limit now since there is a good
4534                          * chance that our ro pointer is now filled
4535                          */
4536                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4537                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4538
4539 #ifdef SCTP_DEBUG
4540                         /* Copy to be sure something bad is not happening */
4541                         sin6->sin6_addr = ip6h->ip6_dst;
4542                         lsa6->sin6_addr = ip6h->ip6_src;
4543 #endif
4544
4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4546                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4547                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4548                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4549                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4550                         if (net) {
4551                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4552                                 /*
4553                                  * preserve the port and scope for link
4554                                  * local send
4555                                  */
4556                                 prev_scope = sin6->sin6_scope_id;
4557                                 prev_port = sin6->sin6_port;
4558                         }
4559
4560                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4561                                 /* failed to prepend data, give up */
4562                                 sctp_m_freem(m);
4563                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4564                                 return (ENOMEM);
4565                         }
4566                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4567                         if (port) {
4568                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4569                                 SCTP_STAT_INCR(sctps_sendswcrc);
4570                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4571                                         udp->uh_sum = 0xffff;
4572                                 }
4573                         } else {
4574                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4575                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4576                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4577                         }
4578                         /* send it out. table id is taken from stcb */
4579 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4580                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4581                                 so = SCTP_INP_SO(inp);
4582                                 SCTP_SOCKET_UNLOCK(so, 0);
4583                         }
4584 #endif
4585 #ifdef SCTP_PACKET_LOGGING
4586                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4587                                 sctp_packet_log(o_pak);
4588 #endif
4589                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4590                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4592                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4593                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4594                                 SCTP_TCB_UNLOCK(stcb);
4595                                 SCTP_SOCKET_LOCK(so, 0);
4596                                 SCTP_TCB_LOCK(stcb);
4597                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4598                         }
4599 #endif
4600                         if (net) {
4601                                 /* for link local this must be done */
4602                                 sin6->sin6_scope_id = prev_scope;
4603                                 sin6->sin6_port = prev_port;
4604                         }
4605                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4606                         SCTP_STAT_INCR(sctps_sendpackets);
4607                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4608                         if (ret) {
4609                                 SCTP_STAT_INCR(sctps_senderrors);
4610                         }
4611                         if (net == NULL) {
4612                                 /* Now if we had a temp route free it */
4613                                 RO_RTFREE(ro);
4614                         } else {
4615                                 /*
4616                                  * PMTU check versus smallest asoc MTU goes
4617                                  * here
4618                                  */
4619                                 if (ro->ro_rt == NULL) {
4620                                         /* Route was freed */
4621                                         if (net->ro._s_addr &&
4622                                             net->src_addr_selected) {
4623                                                 sctp_free_ifa(net->ro._s_addr);
4624                                                 net->ro._s_addr = NULL;
4625                                         }
4626                                         net->src_addr_selected = 0;
4627                                 }
4628                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4629                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4630                                         uint32_t mtu;
4631
4632                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4633                                         if (mtu > 0) {
4634                                                 if (net->port) {
4635                                                         mtu -= sizeof(struct udphdr);
4636                                                 }
4637                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4638                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4639                                                 }
4640                                                 net->mtu = mtu;
4641                                         }
4642                                 } else if (ifp) {
4643                                         if (ND_IFINFO(ifp)->linkmtu &&
4644                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4645                                                 sctp_mtu_size_reset(inp,
4646                                                     &stcb->asoc,
4647                                                     ND_IFINFO(ifp)->linkmtu);
4648                                         }
4649                                 }
4650                         }
4651                         return (ret);
4652                 }
4653 #endif
4654         default:
4655                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4656                     ((struct sockaddr *)to)->sa_family);
4657                 sctp_m_freem(m);
4658                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4659                 return (EFAULT);
4660         }
4661 }
4662
4663
4664 void
4665 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4666 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4667     SCTP_UNUSED
4668 #endif
4669 )
4670 {
4671         struct mbuf *m, *m_last;
4672         struct sctp_nets *net;
4673         struct sctp_init_chunk *init;
4674         struct sctp_supported_addr_param *sup_addr;
4675         struct sctp_adaptation_layer_indication *ali;
4676         struct sctp_supported_chunk_types_param *pr_supported;
4677         struct sctp_paramhdr *ph;
4678         int cnt_inits_to = 0;
4679         int error;
4680         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4681
4682         /* INIT's always go to the primary (and usually ONLY address) */
4683         net = stcb->asoc.primary_destination;
4684         if (net == NULL) {
4685                 net = TAILQ_FIRST(&stcb->asoc.nets);
4686                 if (net == NULL) {
4687                         /* TSNH */
4688                         return;
4689                 }
4690                 /* we confirm any address we send an INIT to */
4691                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4692                 (void)sctp_set_primary_addr(stcb, NULL, net);
4693         } else {
4694                 /* we confirm any address we send an INIT to */
4695                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4696         }
4697         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4698 #ifdef INET6
4699         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4700                 /*
4701                  * special hook, if we are sending to link local it will not
4702                  * show up in our private address count.
4703                  */
4704                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4705                         cnt_inits_to = 1;
4706         }
4707 #endif
4708         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4709                 /* This case should not happen */
4710                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4711                 return;
4712         }
4713         /* start the INIT timer */
4714         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4715
4716         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4717         if (m == NULL) {
4718                 /* No memory, INIT timer will re-attempt. */
4719                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4720                 return;
4721         }
4722         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4723         padding_len = 0;
4724         /* Now lets put the chunk header in place */
4725         init = mtod(m, struct sctp_init_chunk *);
4726         /* now the chunk header */
4727         init->ch.chunk_type = SCTP_INITIATION;
4728         init->ch.chunk_flags = 0;
4729         /* fill in later from mbuf we build */
4730         init->ch.chunk_length = 0;
4731         /* place in my tag */
4732         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4733         /* set up some of the credits. */
4734         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4735             SCTP_MINIMAL_RWND));
4736         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4737         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4738         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4739
4740         /* Adaptation layer indication parameter */
4741         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4742                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4743                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4744                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4745                 ali->ph.param_length = htons(parameter_len);
4746                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4747                 chunk_len += parameter_len;
4748         }
4749
4750         /* ECN parameter */
4751         if (stcb->asoc.ecn_supported == 1) {
4752                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4753                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4754                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4755                 ph->param_length = htons(parameter_len);
4756                 chunk_len += parameter_len;
4757         }
4758
4759         /* PR-SCTP supported parameter */
4760         if (stcb->asoc.prsctp_supported == 1) {
4761                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4762                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4763                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4764                 ph->param_length = htons(parameter_len);
4765                 chunk_len += parameter_len;
4766         }
4767
4768         /* Add NAT friendly parameter. */
4769         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4770                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4771                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4772                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4773                 ph->param_length = htons(parameter_len);
4774                 chunk_len += parameter_len;
4775         }
4776
4777         /* And now tell the peer which extensions we support */
4778         num_ext = 0;
4779         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4780         if (stcb->asoc.prsctp_supported == 1) {
4781                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4782                 if (stcb->asoc.idata_supported) {
4783                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4784                 }
4785         }
4786         if (stcb->asoc.auth_supported == 1) {
4787                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4788         }
4789         if (stcb->asoc.asconf_supported == 1) {
4790                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4791                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4792         }
4793         if (stcb->asoc.reconfig_supported == 1) {
4794                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4795         }
4796         if (stcb->asoc.idata_supported) {
4797                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4798         }
4799         if (stcb->asoc.nrsack_supported == 1) {
4800                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4801         }
4802         if (stcb->asoc.pktdrop_supported == 1) {
4803                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4804         }
4805         if (num_ext > 0) {
4806                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4807                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4808                 pr_supported->ph.param_length = htons(parameter_len);
4809                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4810                 chunk_len += parameter_len;
4811         }
4812         /* add authentication parameters */
4813         if (stcb->asoc.auth_supported) {
4814                 /* attach RANDOM parameter, if available */
4815                 if (stcb->asoc.authinfo.random != NULL) {
4816                         struct sctp_auth_random *randp;
4817
4818                         if (padding_len > 0) {
4819                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4820                                 chunk_len += padding_len;
4821                                 padding_len = 0;
4822                         }
4823                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4824                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4825                         /* random key already contains the header */
4826                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4827                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4828                         chunk_len += parameter_len;
4829                 }
4830                 /* add HMAC_ALGO parameter */
4831                 if (stcb->asoc.local_hmacs != NULL) {
4832                         struct sctp_auth_hmac_algo *hmacs;
4833
4834                         if (padding_len > 0) {
4835                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4836                                 chunk_len += padding_len;
4837                                 padding_len = 0;
4838                         }
4839                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4840                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4841                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4842                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4843                         hmacs->ph.param_length = htons(parameter_len);
4844                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4845                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4846                         chunk_len += parameter_len;
4847                 }
4848                 /* add CHUNKS parameter */
4849                 if (stcb->asoc.local_auth_chunks != NULL) {
4850                         struct sctp_auth_chunk_list *chunks;
4851
4852                         if (padding_len > 0) {
4853                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4854                                 chunk_len += padding_len;
4855                                 padding_len = 0;
4856                         }
4857                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4858                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4859                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4860                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4861                         chunks->ph.param_length = htons(parameter_len);
4862                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4863                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4864                         chunk_len += parameter_len;
4865                 }
4866         }
4867
4868         /* now any cookie time extensions */
4869         if (stcb->asoc.cookie_preserve_req) {
4870                 struct sctp_cookie_perserve_param *cookie_preserve;
4871
4872                 if (padding_len > 0) {
4873                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4874                         chunk_len += padding_len;
4875                         padding_len = 0;
4876                 }
4877                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4878                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4879                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4880                 cookie_preserve->ph.param_length = htons(parameter_len);
4881                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4882                 stcb->asoc.cookie_preserve_req = 0;
4883                 chunk_len += parameter_len;
4884         }
4885
4886         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4887                 uint8_t i;
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_paramhdr);
4895                 if (stcb->asoc.scope.ipv4_addr_legal) {
4896                         parameter_len += (uint16_t)sizeof(uint16_t);
4897                 }
4898                 if (stcb->asoc.scope.ipv6_addr_legal) {
4899                         parameter_len += (uint16_t)sizeof(uint16_t);
4900                 }
4901                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4902                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4903                 sup_addr->ph.param_length = htons(parameter_len);
4904                 i = 0;
4905                 if (stcb->asoc.scope.ipv4_addr_legal) {
4906                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4907                 }
4908                 if (stcb->asoc.scope.ipv6_addr_legal) {
4909                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4910                 }
4911                 padding_len = 4 - 2 * i;
4912                 chunk_len += parameter_len;
4913         }
4914
4915         SCTP_BUF_LEN(m) = chunk_len;
4916         /* now the addresses */
4917         /*
4918          * To optimize this we could put the scoping stuff into a structure
4919          * and remove the individual uint8's from the assoc structure. Then
4920          * we could just sifa in the address within the stcb. But for now
4921          * this is a quick hack to get the address stuff teased apart.
4922          */
4923         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4924             m, cnt_inits_to,
4925             &padding_len, &chunk_len);
4926
4927         init->ch.chunk_length = htons(chunk_len);
4928         if (padding_len > 0) {
4929                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4930                         sctp_m_freem(m);
4931                         return;
4932                 }
4933         }
4934         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4935         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4936             (struct sockaddr *)&net->ro._l_addr,
4937             m, 0, NULL, 0, 0, 0, 0,
4938             inp->sctp_lport, stcb->rport, htonl(0),
4939             net->port, NULL,
4940             0, 0,
4941             so_locked))) {
4942                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4943                 if (error == ENOBUFS) {
4944                         stcb->asoc.ifp_had_enobuf = 1;
4945                         SCTP_STAT_INCR(sctps_lowlevelerr);
4946                 }
4947         } else {
4948                 stcb->asoc.ifp_had_enobuf = 0;
4949         }
4950         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4951         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4952 }
4953
4954 struct mbuf *
4955 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4956     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4957 {
4958         /*
4959          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4960          * being equal to the beginning of the params i.e. (iphlen +
4961          * sizeof(struct sctp_init_msg) parse through the parameters to the
4962          * end of the mbuf verifying that all parameters are known.
4963          *
4964          * For unknown parameters build and return a mbuf with
4965          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4966          * processing this chunk stop, and set *abort_processing to 1.
4967          *
4968          * By having param_offset be pre-set to where parameters begin it is
4969          * hoped that this routine may be reused in the future by new
4970          * features.
4971          */
4972         struct sctp_paramhdr *phdr, params;
4973
4974         struct mbuf *mat, *op_err;
4975         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4976         int at, limit, pad_needed;
4977         uint16_t ptype, plen, padded_size;
4978         int err_at;
4979
4980         *abort_processing = 0;
4981         mat = in_initpkt;
4982         err_at = 0;
4983         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4984         at = param_offset;
4985         op_err = NULL;
4986         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4987         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4988         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4989                 ptype = ntohs(phdr->param_type);
4990                 plen = ntohs(phdr->param_length);
4991                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4992                         /* wacked parameter */
4993                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4994                         goto invalid_size;
4995                 }
4996                 limit -= SCTP_SIZE32(plen);
4997                 /*-
4998                  * All parameters for all chunks that we know/understand are
4999                  * listed here. We process them other places and make
5000                  * appropriate stop actions per the upper bits. However this
5001                  * is the generic routine processor's can call to get back
5002                  * an operr.. to either incorporate (init-ack) or send.
5003                  */
5004                 padded_size = SCTP_SIZE32(plen);
5005                 switch (ptype) {
5006                         /* Param's with variable size */
5007                 case SCTP_HEARTBEAT_INFO:
5008                 case SCTP_STATE_COOKIE:
5009                 case SCTP_UNRECOG_PARAM:
5010                 case SCTP_ERROR_CAUSE_IND:
5011                         /* ok skip fwd */
5012                         at += padded_size;
5013                         break;
5014                         /* Param's with variable size within a range */
5015                 case SCTP_CHUNK_LIST:
5016                 case SCTP_SUPPORTED_CHUNK_EXT:
5017                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5018                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5019                                 goto invalid_size;
5020                         }
5021                         at += padded_size;
5022                         break;
5023                 case SCTP_SUPPORTED_ADDRTYPE:
5024                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5025                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5026                                 goto invalid_size;
5027                         }
5028                         at += padded_size;
5029                         break;
5030                 case SCTP_RANDOM:
5031                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5032                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5033                                 goto invalid_size;
5034                         }
5035                         at += padded_size;
5036                         break;
5037                 case SCTP_SET_PRIM_ADDR:
5038                 case SCTP_DEL_IP_ADDRESS:
5039                 case SCTP_ADD_IP_ADDRESS:
5040                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5041                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5042                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5043                                 goto invalid_size;
5044                         }
5045                         at += padded_size;
5046                         break;
5047                         /* Param's with a fixed size */
5048                 case SCTP_IPV4_ADDRESS:
5049                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5050                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5051                                 goto invalid_size;
5052                         }
5053                         at += padded_size;
5054                         break;
5055                 case SCTP_IPV6_ADDRESS:
5056                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5057                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5058                                 goto invalid_size;
5059                         }
5060                         at += padded_size;
5061                         break;
5062                 case SCTP_COOKIE_PRESERVE:
5063                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5064                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5065                                 goto invalid_size;
5066                         }
5067                         at += padded_size;
5068                         break;
5069                 case SCTP_HAS_NAT_SUPPORT:
5070                         *nat_friendly = 1;
5071                         /* fall through */
5072                 case SCTP_PRSCTP_SUPPORTED:
5073                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5074                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5075                                 goto invalid_size;
5076                         }
5077                         at += padded_size;
5078                         break;
5079                 case SCTP_ECN_CAPABLE:
5080                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5081                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5082                                 goto invalid_size;
5083                         }
5084                         at += padded_size;
5085                         break;
5086                 case SCTP_ULP_ADAPTATION:
5087                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5088                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5089                                 goto invalid_size;
5090                         }
5091                         at += padded_size;
5092                         break;
5093                 case SCTP_SUCCESS_REPORT:
5094                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5095                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5096                                 goto invalid_size;
5097                         }
5098                         at += padded_size;
5099                         break;
5100                 case SCTP_HOSTNAME_ADDRESS:
5101                         {
5102                                 /* We can NOT handle HOST NAME addresses!! */
5103                                 int l_len;
5104
5105                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5106                                 *abort_processing = 1;
5107                                 if (op_err == NULL) {
5108                                         /* Ok need to try to get a mbuf */
5109 #ifdef INET6
5110                                         l_len = SCTP_MIN_OVERHEAD;
5111 #else
5112                                         l_len = SCTP_MIN_V4_OVERHEAD;
5113 #endif
5114                                         l_len += sizeof(struct sctp_chunkhdr);
5115                                         l_len += plen;
5116                                         l_len += sizeof(struct sctp_paramhdr);
5117                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5118                                         if (op_err) {
5119                                                 SCTP_BUF_LEN(op_err) = 0;
5120                                                 /*
5121                                                  * pre-reserve space for ip
5122                                                  * and sctp header  and
5123                                                  * chunk hdr
5124                                                  */
5125 #ifdef INET6
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5127 #else
5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5129 #endif
5130                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5131                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5132                                         }
5133                                 }
5134                                 if (op_err) {
5135                                         /* If we have space */
5136                                         struct sctp_paramhdr s;
5137
5138                                         if (err_at % 4) {
5139                                                 uint32_t cpthis = 0;
5140
5141                                                 pad_needed = 4 - (err_at % 4);
5142                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5143                                                 err_at += pad_needed;
5144                                         }
5145                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5146                                         s.param_length = htons(sizeof(s) + plen);
5147                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5148                                         err_at += sizeof(s);
5149                                         if (plen > sizeof(tempbuf)) {
5150                                                 plen = sizeof(tempbuf);
5151                                         }
5152                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5153                                         if (phdr == NULL) {
5154                                                 sctp_m_freem(op_err);
5155                                                 /*
5156                                                  * we are out of memory but
5157                                                  * we still need to have a
5158                                                  * look at what to do (the
5159                                                  * system is in trouble
5160                                                  * though).
5161                                                  */
5162                                                 return (NULL);
5163                                         }
5164                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5165                                 }
5166                                 return (op_err);
5167                                 break;
5168                         }
5169                 default:
5170                         /*
5171                          * we do not recognize the parameter figure out what
5172                          * we do.
5173                          */
5174                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5175                         if ((ptype & 0x4000) == 0x4000) {
5176                                 /* Report bit is set?? */
5177                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5178                                 if (op_err == NULL) {
5179                                         int l_len;
5180
5181                                         /* Ok need to try to get an mbuf */
5182 #ifdef INET6
5183                                         l_len = SCTP_MIN_OVERHEAD;
5184 #else
5185                                         l_len = SCTP_MIN_V4_OVERHEAD;
5186 #endif
5187                                         l_len += sizeof(struct sctp_chunkhdr);
5188                                         l_len += plen;
5189                                         l_len += sizeof(struct sctp_paramhdr);
5190                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5191                                         if (op_err) {
5192                                                 SCTP_BUF_LEN(op_err) = 0;
5193 #ifdef INET6
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5195 #else
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5197 #endif
5198                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5199                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5200                                         }
5201                                 }
5202                                 if (op_err) {
5203                                         /* If we have space */
5204                                         struct sctp_paramhdr s;
5205
5206                                         if (err_at % 4) {
5207                                                 uint32_t cpthis = 0;
5208
5209                                                 pad_needed = 4 - (err_at % 4);
5210                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5211                                                 err_at += pad_needed;
5212                                         }
5213                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5214                                         s.param_length = htons(sizeof(s) + plen);
5215                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5216                                         err_at += sizeof(s);
5217                                         if (plen > sizeof(tempbuf)) {
5218                                                 plen = sizeof(tempbuf);
5219                                         }
5220                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5221                                         if (phdr == NULL) {
5222                                                 sctp_m_freem(op_err);
5223                                                 /*
5224                                                  * we are out of memory but
5225                                                  * we still need to have a
5226                                                  * look at what to do (the
5227                                                  * system is in trouble
5228                                                  * though).
5229                                                  */
5230                                                 op_err = NULL;
5231                                                 goto more_processing;
5232                                         }
5233                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5234                                         err_at += plen;
5235                                 }
5236                         }
5237         more_processing:
5238                         if ((ptype & 0x8000) == 0x0000) {
5239                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5240                                 return (op_err);
5241                         } else {
5242                                 /* skip this chunk and continue processing */
5243                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5244                                 at += SCTP_SIZE32(plen);
5245                         }
5246                         break;
5247
5248                 }
5249                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5250         }
5251         return (op_err);
5252 invalid_size:
5253         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5254         *abort_processing = 1;
5255         if ((op_err == NULL) && phdr) {
5256                 int l_len;
5257 #ifdef INET6
5258                 l_len = SCTP_MIN_OVERHEAD;
5259 #else
5260                 l_len = SCTP_MIN_V4_OVERHEAD;
5261 #endif
5262                 l_len += sizeof(struct sctp_chunkhdr);
5263                 l_len += (2 * sizeof(struct sctp_paramhdr));
5264                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5265                 if (op_err) {
5266                         SCTP_BUF_LEN(op_err) = 0;
5267 #ifdef INET6
5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5269 #else
5270                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5271 #endif
5272                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5273                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5274                 }
5275         }
5276         if ((op_err) && phdr) {
5277                 struct sctp_paramhdr s;
5278
5279                 if (err_at % 4) {
5280                         uint32_t cpthis = 0;
5281
5282                         pad_needed = 4 - (err_at % 4);
5283                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5284                         err_at += pad_needed;
5285                 }
5286                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5287                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5288                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5289                 err_at += sizeof(s);
5290                 /* Only copy back the p-hdr that caused the issue */
5291                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5292         }
5293         return (op_err);
5294 }
5295
5296 static int
5297 sctp_are_there_new_addresses(struct sctp_association *asoc,
5298     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5299 {
5300         /*
5301          * Given a INIT packet, look through the packet to verify that there
5302          * are NO new addresses. As we go through the parameters add reports
5303          * of any un-understood parameters that require an error.  Also we
5304          * must return (1) to drop the packet if we see a un-understood
5305          * parameter that tells us to drop the chunk.
5306          */
5307         struct sockaddr *sa_touse;
5308         struct sockaddr *sa;
5309         struct sctp_paramhdr *phdr, params;
5310         uint16_t ptype, plen;
5311         uint8_t fnd;
5312         struct sctp_nets *net;
5313         int check_src;
5314 #ifdef INET
5315         struct sockaddr_in sin4, *sa4;
5316 #endif
5317 #ifdef INET6
5318         struct sockaddr_in6 sin6, *sa6;
5319 #endif
5320
5321 #ifdef INET
5322         memset(&sin4, 0, sizeof(sin4));
5323         sin4.sin_family = AF_INET;
5324         sin4.sin_len = sizeof(sin4);
5325 #endif
5326 #ifdef INET6
5327         memset(&sin6, 0, sizeof(sin6));
5328         sin6.sin6_family = AF_INET6;
5329         sin6.sin6_len = sizeof(sin6);
5330 #endif
5331         /* First what about the src address of the pkt ? */
5332         check_src = 0;
5333         switch (src->sa_family) {
5334 #ifdef INET
5335         case AF_INET:
5336                 if (asoc->scope.ipv4_addr_legal) {
5337                         check_src = 1;
5338                 }
5339                 break;
5340 #endif
5341 #ifdef INET6
5342         case AF_INET6:
5343                 if (asoc->scope.ipv6_addr_legal) {
5344                         check_src = 1;
5345                 }
5346                 break;
5347 #endif
5348         default:
5349                 /* TSNH */
5350                 break;
5351         }
5352         if (check_src) {
5353                 fnd = 0;
5354                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5355                         sa = (struct sockaddr *)&net->ro._l_addr;
5356                         if (sa->sa_family == src->sa_family) {
5357 #ifdef INET
5358                                 if (sa->sa_family == AF_INET) {
5359                                         struct sockaddr_in *src4;
5360
5361                                         sa4 = (struct sockaddr_in *)sa;
5362                                         src4 = (struct sockaddr_in *)src;
5363                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5364                                                 fnd = 1;
5365                                                 break;
5366                                         }
5367                                 }
5368 #endif
5369 #ifdef INET6
5370                                 if (sa->sa_family == AF_INET6) {
5371                                         struct sockaddr_in6 *src6;
5372
5373                                         sa6 = (struct sockaddr_in6 *)sa;
5374                                         src6 = (struct sockaddr_in6 *)src;
5375                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5376                                                 fnd = 1;
5377                                                 break;
5378                                         }
5379                                 }
5380 #endif
5381                         }
5382                 }
5383                 if (fnd == 0) {
5384                         /* New address added! no need to look further. */
5385                         return (1);
5386                 }
5387         }
5388         /* Ok so far lets munge through the rest of the packet */
5389         offset += sizeof(struct sctp_init_chunk);
5390         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5391         while (phdr) {
5392                 sa_touse = NULL;
5393                 ptype = ntohs(phdr->param_type);
5394                 plen = ntohs(phdr->param_length);
5395                 switch (ptype) {
5396 #ifdef INET
5397                 case SCTP_IPV4_ADDRESS:
5398                         {
5399                                 struct sctp_ipv4addr_param *p4, p4_buf;
5400
5401                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5402                                         return (1);
5403                                 }
5404                                 phdr = sctp_get_next_param(in_initpkt, offset,
5405                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5406                                 if (phdr == NULL) {
5407                                         return (1);
5408                                 }
5409                                 if (asoc->scope.ipv4_addr_legal) {
5410                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5411                                         sin4.sin_addr.s_addr = p4->addr;
5412                                         sa_touse = (struct sockaddr *)&sin4;
5413                                 }
5414                                 break;
5415                         }
5416 #endif
5417 #ifdef INET6
5418                 case SCTP_IPV6_ADDRESS:
5419                         {
5420                                 struct sctp_ipv6addr_param *p6, p6_buf;
5421
5422                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5423                                         return (1);
5424                                 }
5425                                 phdr = sctp_get_next_param(in_initpkt, offset,
5426                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5427                                 if (phdr == NULL) {
5428                                         return (1);
5429                                 }
5430                                 if (asoc->scope.ipv6_addr_legal) {
5431                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5432                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5433                                             sizeof(p6->addr));
5434                                         sa_touse = (struct sockaddr *)&sin6;
5435                                 }
5436                                 break;
5437                         }
5438 #endif
5439                 default:
5440                         sa_touse = NULL;
5441                         break;
5442                 }
5443                 if (sa_touse) {
5444                         /* ok, sa_touse points to one to check */
5445                         fnd = 0;
5446                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5447                                 sa = (struct sockaddr *)&net->ro._l_addr;
5448                                 if (sa->sa_family != sa_touse->sa_family) {
5449                                         continue;
5450                                 }
5451 #ifdef INET
5452                                 if (sa->sa_family == AF_INET) {
5453                                         sa4 = (struct sockaddr_in *)sa;
5454                                         if (sa4->sin_addr.s_addr ==
5455                                             sin4.sin_addr.s_addr) {
5456                                                 fnd = 1;
5457                                                 break;
5458                                         }
5459                                 }
5460 #endif
5461 #ifdef INET6
5462                                 if (sa->sa_family == AF_INET6) {
5463                                         sa6 = (struct sockaddr_in6 *)sa;
5464                                         if (SCTP6_ARE_ADDR_EQUAL(
5465                                             sa6, &sin6)) {
5466                                                 fnd = 1;
5467                                                 break;
5468                                         }
5469                                 }
5470 #endif
5471                         }
5472                         if (!fnd) {
5473                                 /* New addr added! no need to look further */
5474                                 return (1);
5475                         }
5476                 }
5477                 offset += SCTP_SIZE32(plen);
5478                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5479         }
5480         return (0);
5481 }
5482
5483 /*
5484  * Given a MBUF chain that was sent into us containing an INIT. Build a
5485  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5486  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5487  * message (i.e. the struct sctp_init_msg).
5488  */
5489 void
5490 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5491     struct sctp_nets *src_net, struct mbuf *init_pkt,
5492     int iphlen, int offset,
5493     struct sockaddr *src, struct sockaddr *dst,
5494     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5495     uint8_t mflowtype, uint32_t mflowid,
5496     uint32_t vrf_id, uint16_t port)
5497 {
5498         struct sctp_association *asoc;
5499         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5500         struct sctp_init_ack_chunk *initack;
5501         struct sctp_adaptation_layer_indication *ali;
5502         struct sctp_supported_chunk_types_param *pr_supported;
5503         struct sctp_paramhdr *ph;
5504         union sctp_sockstore *over_addr;
5505         struct sctp_scoping scp;
5506         struct timeval now;
5507 #ifdef INET
5508         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5509         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5510         struct sockaddr_in *sin;
5511 #endif
5512 #ifdef INET6
5513         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5514         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5515         struct sockaddr_in6 *sin6;
5516 #endif
5517         struct sockaddr *to;
5518         struct sctp_state_cookie stc;
5519         struct sctp_nets *net = NULL;
5520         uint8_t *signature = NULL;
5521         int cnt_inits_to = 0;
5522         uint16_t his_limit, i_want;
5523         int abort_flag;
5524         int nat_friendly = 0;
5525         int error;
5526         struct socket *so;
5527         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5528
5529         if (stcb) {
5530                 asoc = &stcb->asoc;
5531         } else {
5532                 asoc = NULL;
5533         }
5534         if ((asoc != NULL) &&
5535             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5536                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5537                         /*
5538                          * new addresses, out of here in non-cookie-wait
5539                          * states
5540                          *
5541                          * Send an ABORT, without the new address error
5542                          * cause. This looks no different than if no
5543                          * listener was present.
5544                          */
5545                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5546                             "Address added");
5547                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5548                             mflowtype, mflowid, inp->fibnum,
5549                             vrf_id, port);
5550                         return;
5551                 }
5552                 if (src_net != NULL && (src_net->port != port)) {
5553                         /*
5554                          * change of remote encapsulation port, out of here
5555                          * in non-cookie-wait states
5556                          *
5557                          * Send an ABORT, without an specific error cause.
5558                          * This looks no different than if no listener was
5559                          * present.
5560                          */
5561                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5562                             "Remote encapsulation port changed");
5563                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5564                             mflowtype, mflowid, inp->fibnum,
5565                             vrf_id, port);
5566                         return;
5567                 }
5568         }
5569         abort_flag = 0;
5570         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5571             (offset + sizeof(struct sctp_init_chunk)),
5572             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5573         if (abort_flag) {
5574 do_a_abort:
5575                 if (op_err == NULL) {
5576                         char msg[SCTP_DIAG_INFO_LEN];
5577
5578                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5579                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5580                             msg);
5581                 }
5582                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5583                     init_chk->init.initiate_tag, op_err,
5584                     mflowtype, mflowid, inp->fibnum,
5585                     vrf_id, port);
5586                 return;
5587         }
5588         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5589         if (m == NULL) {
5590                 /* No memory, INIT timer will re-attempt. */
5591                 if (op_err)
5592                         sctp_m_freem(op_err);
5593                 return;
5594         }
5595         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5596         padding_len = 0;
5597
5598         /*
5599          * We might not overwrite the identification[] completely and on
5600          * some platforms time_entered will contain some padding. Therefore
5601          * zero out the cookie to avoid putting uninitialized memory on the
5602          * wire.
5603          */
5604         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5605
5606         /* the time I built cookie */
5607         (void)SCTP_GETTIME_TIMEVAL(&now);
5608         stc.time_entered.tv_sec = now.tv_sec;
5609         stc.time_entered.tv_usec = now.tv_usec;
5610
5611         /* populate any tie tags */
5612         if (asoc != NULL) {
5613                 /* unlock before tag selections */
5614                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5615                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5616                 stc.cookie_life = asoc->cookie_life;
5617                 net = asoc->primary_destination;
5618         } else {
5619                 stc.tie_tag_my_vtag = 0;
5620                 stc.tie_tag_peer_vtag = 0;
5621                 /* life I will award this cookie */
5622                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5623         }
5624
5625         /* copy in the ports for later check */
5626         stc.myport = sh->dest_port;
5627         stc.peerport = sh->src_port;
5628
5629         /*
5630          * If we wanted to honor cookie life extensions, we would add to
5631          * stc.cookie_life. For now we should NOT honor any extension
5632          */
5633         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5634         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5635                 stc.ipv6_addr_legal = 1;
5636                 if (SCTP_IPV6_V6ONLY(inp)) {
5637                         stc.ipv4_addr_legal = 0;
5638                 } else {
5639                         stc.ipv4_addr_legal = 1;
5640                 }
5641         } else {
5642                 stc.ipv6_addr_legal = 0;
5643                 stc.ipv4_addr_legal = 1;
5644         }
5645         stc.ipv4_scope = 0;
5646         if (net == NULL) {
5647                 to = src;
5648                 switch (dst->sa_family) {
5649 #ifdef INET
5650                 case AF_INET:
5651                         {
5652                                 /* lookup address */
5653                                 stc.address[0] = src4->sin_addr.s_addr;
5654                                 stc.address[1] = 0;
5655                                 stc.address[2] = 0;
5656                                 stc.address[3] = 0;
5657                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5658                                 /* local from address */
5659                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5660                                 stc.laddress[1] = 0;
5661                                 stc.laddress[2] = 0;
5662                                 stc.laddress[3] = 0;
5663                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5664                                 /* scope_id is only for v6 */
5665                                 stc.scope_id = 0;
5666                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5667                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5668                                         stc.ipv4_scope = 1;
5669                                 }
5670                                 /* Must use the address in this case */
5671                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5672                                         stc.loopback_scope = 1;
5673                                         stc.ipv4_scope = 1;
5674                                         stc.site_scope = 1;
5675                                         stc.local_scope = 0;
5676                                 }
5677                                 break;
5678                         }
5679 #endif
5680 #ifdef INET6
5681                 case AF_INET6:
5682                         {
5683                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5684                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5685                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5686                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5687                                         stc.loopback_scope = 1;
5688                                         stc.local_scope = 0;
5689                                         stc.site_scope = 1;
5690                                         stc.ipv4_scope = 1;
5691                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5692                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5693                                         /*
5694                                          * If the new destination or source
5695                                          * is a LINK_LOCAL we must have
5696                                          * common both site and local scope.
5697                                          * Don't set local scope though
5698                                          * since we must depend on the
5699                                          * source to be added implicitly. We
5700                                          * cannot assure just because we
5701                                          * share one link that all links are
5702                                          * common.
5703                                          */
5704                                         stc.local_scope = 0;
5705                                         stc.site_scope = 1;
5706                                         stc.ipv4_scope = 1;
5707                                         /*
5708                                          * we start counting for the private
5709                                          * address stuff at 1. since the
5710                                          * link local we source from won't
5711                                          * show up in our scoped count.
5712                                          */
5713                                         cnt_inits_to = 1;
5714                                         /*
5715                                          * pull out the scope_id from
5716                                          * incoming pkt
5717                                          */
5718                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5719                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5720                                         /*
5721                                          * If the new destination or source
5722                                          * is SITE_LOCAL then we must have
5723                                          * site scope in common.
5724                                          */
5725                                         stc.site_scope = 1;
5726                                 }
5727                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5728                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5729                                 break;
5730                         }
5731 #endif
5732                 default:
5733                         /* TSNH */
5734                         goto do_a_abort;
5735                         break;
5736                 }
5737         } else {
5738                 /* set the scope per the existing tcb */
5739
5740 #ifdef INET6
5741                 struct sctp_nets *lnet;
5742 #endif
5743
5744                 stc.loopback_scope = asoc->scope.loopback_scope;
5745                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5746                 stc.site_scope = asoc->scope.site_scope;
5747                 stc.local_scope = asoc->scope.local_scope;
5748 #ifdef INET6
5749                 /* Why do we not consider IPv4 LL addresses? */
5750                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5751                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5752                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5753                                         /*
5754                                          * if we have a LL address, start
5755                                          * counting at 1.
5756                                          */
5757                                         cnt_inits_to = 1;
5758                                 }
5759                         }
5760                 }
5761 #endif
5762                 /* use the net pointer */
5763                 to = (struct sockaddr *)&net->ro._l_addr;
5764                 switch (to->sa_family) {
5765 #ifdef INET
5766                 case AF_INET:
5767                         sin = (struct sockaddr_in *)to;
5768                         stc.address[0] = sin->sin_addr.s_addr;
5769                         stc.address[1] = 0;
5770                         stc.address[2] = 0;
5771                         stc.address[3] = 0;
5772                         stc.addr_type = SCTP_IPV4_ADDRESS;
5773                         if (net->src_addr_selected == 0) {
5774                                 /*
5775                                  * strange case here, the INIT should have
5776                                  * did the selection.
5777                                  */
5778                                 net->ro._s_addr = sctp_source_address_selection(inp,
5779                                     stcb, (sctp_route_t *)&net->ro,
5780                                     net, 0, vrf_id);
5781                                 if (net->ro._s_addr == NULL)
5782                                         return;
5783
5784                                 net->src_addr_selected = 1;
5785
5786                         }
5787                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5788                         stc.laddress[1] = 0;
5789                         stc.laddress[2] = 0;
5790                         stc.laddress[3] = 0;
5791                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5792                         /* scope_id is only for v6 */
5793                         stc.scope_id = 0;
5794                         break;
5795 #endif
5796 #ifdef INET6
5797                 case AF_INET6:
5798                         sin6 = (struct sockaddr_in6 *)to;
5799                         memcpy(&stc.address, &sin6->sin6_addr,
5800                             sizeof(struct in6_addr));
5801                         stc.addr_type = SCTP_IPV6_ADDRESS;
5802                         stc.scope_id = sin6->sin6_scope_id;
5803                         if (net->src_addr_selected == 0) {
5804                                 /*
5805                                  * strange case here, the INIT should have
5806                                  * done the selection.
5807                                  */
5808                                 net->ro._s_addr = sctp_source_address_selection(inp,
5809                                     stcb, (sctp_route_t *)&net->ro,
5810                                     net, 0, vrf_id);
5811                                 if (net->ro._s_addr == NULL)
5812                                         return;
5813
5814                                 net->src_addr_selected = 1;
5815                         }
5816                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5817                             sizeof(struct in6_addr));
5818                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5819                         break;
5820 #endif
5821                 }
5822         }
5823         /* Now lets put the SCTP header in place */
5824         initack = mtod(m, struct sctp_init_ack_chunk *);
5825         /* Save it off for quick ref */
5826         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5827         /* who are we */
5828         memcpy(stc.identification, SCTP_VERSION_STRING,
5829             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5830         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5831         /* now the chunk header */
5832         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5833         initack->ch.chunk_flags = 0;
5834         /* fill in later from mbuf we build */
5835         initack->ch.chunk_length = 0;
5836         /* place in my tag */
5837         if ((asoc != NULL) &&
5838             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5839             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5840             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5841                 /* re-use the v-tags and init-seq here */
5842                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5843                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5844         } else {
5845                 uint32_t vtag, itsn;
5846
5847                 if (asoc) {
5848                         atomic_add_int(&asoc->refcnt, 1);
5849                         SCTP_TCB_UNLOCK(stcb);
5850         new_tag:
5851                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5852                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5853                                 /*
5854                                  * Got a duplicate vtag on some guy behind a
5855                                  * nat make sure we don't use it.
5856                                  */
5857                                 goto new_tag;
5858                         }
5859                         initack->init.initiate_tag = htonl(vtag);
5860                         /* get a TSN to use too */
5861                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5862                         initack->init.initial_tsn = htonl(itsn);
5863                         SCTP_TCB_LOCK(stcb);
5864                         atomic_add_int(&asoc->refcnt, -1);
5865                 } else {
5866                         SCTP_INP_INCR_REF(inp);
5867                         SCTP_INP_RUNLOCK(inp);
5868                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5869                         initack->init.initiate_tag = htonl(vtag);
5870                         /* get a TSN to use too */
5871                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5872                         SCTP_INP_RLOCK(inp);
5873                         SCTP_INP_DECR_REF(inp);
5874                 }
5875         }
5876         /* save away my tag to */
5877         stc.my_vtag = initack->init.initiate_tag;
5878
5879         /* set up some of the credits. */
5880         so = inp->sctp_socket;
5881         if (so == NULL) {
5882                 /* memory problem */
5883                 sctp_m_freem(m);
5884                 return;
5885         } else {
5886                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5887         }
5888         /* set what I want */
5889         his_limit = ntohs(init_chk->init.num_inbound_streams);
5890         /* choose what I want */
5891         if (asoc != NULL) {
5892                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5893                         i_want = asoc->streamoutcnt;
5894                 } else {
5895                         i_want = asoc->pre_open_streams;
5896                 }
5897         } else {
5898                 i_want = inp->sctp_ep.pre_open_stream_count;
5899         }
5900         if (his_limit < i_want) {
5901                 /* I Want more :< */
5902                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5903         } else {
5904                 /* I can have what I want :> */
5905                 initack->init.num_outbound_streams = htons(i_want);
5906         }
5907         /* tell him his limit. */
5908         initack->init.num_inbound_streams =
5909             htons(inp->sctp_ep.max_open_streams_intome);
5910
5911         /* adaptation layer indication parameter */
5912         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5913                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5914                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5915                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5916                 ali->ph.param_length = htons(parameter_len);
5917                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5918                 chunk_len += parameter_len;
5919         }
5920
5921         /* ECN parameter */
5922         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5923             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5924                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5925                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5926                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5927                 ph->param_length = htons(parameter_len);
5928                 chunk_len += parameter_len;
5929         }
5930
5931         /* PR-SCTP supported parameter */
5932         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5933             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5934                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5935                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5936                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5937                 ph->param_length = htons(parameter_len);
5938                 chunk_len += parameter_len;
5939         }
5940
5941         /* Add NAT friendly parameter */
5942         if (nat_friendly) {
5943                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5944                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5945                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5946                 ph->param_length = htons(parameter_len);
5947                 chunk_len += parameter_len;
5948         }
5949
5950         /* And now tell the peer which extensions we support */
5951         num_ext = 0;
5952         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5953         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5954             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5955                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5956                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5957                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5958                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5959                 }
5960         }
5961         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5962             ((asoc == NULL) && (inp->auth_supported == 1))) {
5963                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5964         }
5965         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5966             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5967                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5968                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5969         }
5970         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5971             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5973         }
5974         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5975             ((asoc == NULL) && (inp->idata_supported == 1))) {
5976                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5977         }
5978         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5979             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5980                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5981         }
5982         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5983             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5984                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5985         }
5986         if (num_ext > 0) {
5987                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5988                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5989                 pr_supported->ph.param_length = htons(parameter_len);
5990                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5991                 chunk_len += parameter_len;
5992         }
5993
5994         /* add authentication parameters */
5995         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5996             ((asoc == NULL) && (inp->auth_supported == 1))) {
5997                 struct sctp_auth_random *randp;
5998                 struct sctp_auth_hmac_algo *hmacs;
5999                 struct sctp_auth_chunk_list *chunks;
6000
6001                 if (padding_len > 0) {
6002                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6003                         chunk_len += padding_len;
6004                         padding_len = 0;
6005                 }
6006                 /* generate and add RANDOM parameter */
6007                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6008                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6009                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6010                 randp->ph.param_type = htons(SCTP_RANDOM);
6011                 randp->ph.param_length = htons(parameter_len);
6012                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6013                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6014                 chunk_len += parameter_len;
6015
6016                 if (padding_len > 0) {
6017                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6018                         chunk_len += padding_len;
6019                         padding_len = 0;
6020                 }
6021                 /* add HMAC_ALGO parameter */
6022                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6023                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6024                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6025                     (uint8_t *)hmacs->hmac_ids);
6026                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6027                 hmacs->ph.param_length = htons(parameter_len);
6028                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6029                 chunk_len += parameter_len;
6030
6031                 if (padding_len > 0) {
6032                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6033                         chunk_len += padding_len;
6034                         padding_len = 0;
6035                 }
6036                 /* add CHUNKS parameter */
6037                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6038                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6039                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6040                     chunks->chunk_types);
6041                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6042                 chunks->ph.param_length = htons(parameter_len);
6043                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6044                 chunk_len += parameter_len;
6045         }
6046         SCTP_BUF_LEN(m) = chunk_len;
6047         m_last = m;
6048         /* now the addresses */
6049         /*
6050          * To optimize this we could put the scoping stuff into a structure
6051          * and remove the individual uint8's from the stc structure. Then we
6052          * could just sifa in the address within the stc.. but for now this
6053          * is a quick hack to get the address stuff teased apart.
6054          */
6055         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6056         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6057         scp.loopback_scope = stc.loopback_scope;
6058         scp.ipv4_local_scope = stc.ipv4_scope;
6059         scp.local_scope = stc.local_scope;
6060         scp.site_scope = stc.site_scope;
6061         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6062             cnt_inits_to,
6063             &padding_len, &chunk_len);
6064         /* padding_len can only be positive, if no addresses have been added */
6065         if (padding_len > 0) {
6066                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6067                 chunk_len += padding_len;
6068                 SCTP_BUF_LEN(m) += padding_len;
6069                 padding_len = 0;
6070         }
6071
6072         /* tack on the operational error if present */
6073         if (op_err) {
6074                 parameter_len = 0;
6075                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6076                         parameter_len += SCTP_BUF_LEN(m_tmp);
6077                 }
6078                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6079                 SCTP_BUF_NEXT(m_last) = op_err;
6080                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6081                         m_last = SCTP_BUF_NEXT(m_last);
6082                 }
6083                 chunk_len += parameter_len;
6084         }
6085         if (padding_len > 0) {
6086                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6087                 if (m_last == NULL) {
6088                         /* Houston we have a problem, no space */
6089                         sctp_m_freem(m);
6090                         return;
6091                 }
6092                 chunk_len += padding_len;
6093                 padding_len = 0;
6094         }
6095         /* Now we must build a cookie */
6096         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6097         if (m_cookie == NULL) {
6098                 /* memory problem */
6099                 sctp_m_freem(m);
6100                 return;
6101         }
6102         /* Now append the cookie to the end and update the space/size */
6103         SCTP_BUF_NEXT(m_last) = m_cookie;
6104         parameter_len = 0;
6105         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6106                 parameter_len += SCTP_BUF_LEN(m_tmp);
6107                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6108                         m_last = m_tmp;
6109                 }
6110         }
6111         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6112         chunk_len += parameter_len;
6113
6114         /*
6115          * Place in the size, but we don't include the last pad (if any) in
6116          * the INIT-ACK.
6117          */
6118         initack->ch.chunk_length = htons(chunk_len);
6119
6120         /*
6121          * Time to sign the cookie, we don't sign over the cookie signature
6122          * though thus we set trailer.
6123          */
6124         (void)sctp_hmac_m(SCTP_HMAC,
6125             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6126             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6127             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6128         /*
6129          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6130          * here since the timer will drive a retranmission.
6131          */
6132         if (padding_len > 0) {
6133                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6134                         sctp_m_freem(m);
6135                         return;
6136                 }
6137         }
6138         if (stc.loopback_scope) {
6139                 over_addr = (union sctp_sockstore *)dst;
6140         } else {
6141                 over_addr = NULL;
6142         }
6143
6144         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6145             0, 0,
6146             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6147             port, over_addr,
6148             mflowtype, mflowid,
6149             SCTP_SO_NOT_LOCKED))) {
6150                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6151                 if (error == ENOBUFS) {
6152                         if (asoc != NULL) {
6153                                 asoc->ifp_had_enobuf = 1;
6154                         }
6155                         SCTP_STAT_INCR(sctps_lowlevelerr);
6156                 }
6157         } else {
6158                 if (asoc != NULL) {
6159                         asoc->ifp_had_enobuf = 0;
6160                 }
6161         }
6162         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6163 }
6164
6165
6166 static void
6167 sctp_prune_prsctp(struct sctp_tcb *stcb,
6168     struct sctp_association *asoc,
6169     struct sctp_sndrcvinfo *srcv,
6170     int dataout)
6171 {
6172         int freed_spc = 0;
6173         struct sctp_tmit_chunk *chk, *nchk;
6174
6175         SCTP_TCB_LOCK_ASSERT(stcb);
6176         if ((asoc->prsctp_supported) &&
6177             (asoc->sent_queue_cnt_removeable > 0)) {
6178                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6179                         /*
6180                          * Look for chunks marked with the PR_SCTP flag AND
6181                          * the buffer space flag. If the one being sent is
6182                          * equal or greater priority then purge the old one
6183                          * and free some space.
6184                          */
6185                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6186                                 /*
6187                                  * This one is PR-SCTP AND buffer space
6188                                  * limited type
6189                                  */
6190                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6191                                         /*
6192                                          * Lower numbers equates to higher
6193                                          * priority so if the one we are
6194                                          * looking at has a larger or equal
6195                                          * priority we want to drop the data
6196                                          * and NOT retransmit it.
6197                                          */
6198                                         if (chk->data) {
6199                                                 /*
6200                                                  * We release the book_size
6201                                                  * if the mbuf is here
6202                                                  */
6203                                                 int ret_spc;
6204                                                 uint8_t sent;
6205
6206                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6207                                                         sent = 1;
6208                                                 else
6209                                                         sent = 0;
6210                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6211                                                     sent,
6212                                                     SCTP_SO_LOCKED);
6213                                                 freed_spc += ret_spc;
6214                                                 if (freed_spc >= dataout) {
6215                                                         return;
6216                                                 }
6217                                         }       /* if chunk was present */
6218                                 }       /* if of sufficient priority */
6219                         }       /* if chunk has enabled */
6220                 }               /* tailqforeach */
6221
6222                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6223                         /* Here we must move to the sent queue and mark */
6224                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6225                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6226                                         if (chk->data) {
6227                                                 /*
6228                                                  * We release the book_size
6229                                                  * if the mbuf is here
6230                                                  */
6231                                                 int ret_spc;
6232
6233                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6234                                                     0, SCTP_SO_LOCKED);
6235
6236                                                 freed_spc += ret_spc;
6237                                                 if (freed_spc >= dataout) {
6238                                                         return;
6239                                                 }
6240                                         }       /* end if chk->data */
6241                                 }       /* end if right class */
6242                         }       /* end if chk pr-sctp */
6243                 }               /* tailqforeachsafe (chk) */
6244         }                       /* if enabled in asoc */
6245 }
6246
6247 int
6248 sctp_get_frag_point(struct sctp_tcb *stcb,
6249     struct sctp_association *asoc)
6250 {
6251         int siz, ovh;
6252
6253         /*
6254          * For endpoints that have both v6 and v4 addresses we must reserve
6255          * room for the ipv6 header, for those that are only dealing with V4
6256          * we use a larger frag point.
6257          */
6258         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6259                 ovh = SCTP_MIN_OVERHEAD;
6260         } else {
6261                 ovh = SCTP_MIN_V4_OVERHEAD;
6262         }
6263         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6264         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6265                 siz = asoc->smallest_mtu - ovh;
6266         else
6267                 siz = (stcb->asoc.sctp_frag_point - ovh);
6268         /*
6269          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6270          */
6271         /* A data chunk MUST fit in a cluster */
6272         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6273         /* } */
6274
6275         /* adjust for an AUTH chunk if DATA requires auth */
6276         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6277                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6278
6279         if (siz % 4) {
6280                 /* make it an even word boundary please */
6281                 siz -= (siz % 4);
6282         }
6283         return (siz);
6284 }
6285
6286 static void
6287 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6288 {
6289         /*
6290          * We assume that the user wants PR_SCTP_TTL if the user provides a
6291          * positive lifetime but does not specify any PR_SCTP policy.
6292          */
6293         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6294                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6295         } else if (sp->timetolive > 0) {
6296                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6297                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6298         } else {
6299                 return;
6300         }
6301         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6302         case CHUNK_FLAGS_PR_SCTP_BUF:
6303                 /*
6304                  * Time to live is a priority stored in tv_sec when doing
6305                  * the buffer drop thing.
6306                  */
6307                 sp->ts.tv_sec = sp->timetolive;
6308                 sp->ts.tv_usec = 0;
6309                 break;
6310         case CHUNK_FLAGS_PR_SCTP_TTL:
6311                 {
6312                         struct timeval tv;
6313
6314                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6315                         tv.tv_sec = sp->timetolive / 1000;
6316                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6317                         /*
6318                          * TODO sctp_constants.h needs alternative time
6319                          * macros when _KERNEL is undefined.
6320                          */
6321                         timevaladd(&sp->ts, &tv);
6322                 }
6323                 break;
6324         case CHUNK_FLAGS_PR_SCTP_RTX:
6325                 /*
6326                  * Time to live is a the number or retransmissions stored in
6327                  * tv_sec.
6328                  */
6329                 sp->ts.tv_sec = sp->timetolive;
6330                 sp->ts.tv_usec = 0;
6331                 break;
6332         default:
6333                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6334                     "Unknown PR_SCTP policy %u.\n",
6335                     PR_SCTP_POLICY(sp->sinfo_flags));
6336                 break;
6337         }
6338 }
6339
6340 static int
6341 sctp_msg_append(struct sctp_tcb *stcb,
6342     struct sctp_nets *net,
6343     struct mbuf *m,
6344     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6345 {
6346         int error = 0;
6347         struct mbuf *at;
6348         struct sctp_stream_queue_pending *sp = NULL;
6349         struct sctp_stream_out *strm;
6350
6351         /*
6352          * Given an mbuf chain, put it into the association send queue and
6353          * place it on the wheel
6354          */
6355         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6356                 /* Invalid stream number */
6357                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6358                 error = EINVAL;
6359                 goto out_now;
6360         }
6361         if ((stcb->asoc.stream_locked) &&
6362             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6363                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6364                 error = EINVAL;
6365                 goto out_now;
6366         }
6367         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6368         /* Now can we send this? */
6369         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6370             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6371             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6372             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6373                 /* got data while shutting down */
6374                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6375                 error = ECONNRESET;
6376                 goto out_now;
6377         }
6378         sctp_alloc_a_strmoq(stcb, sp);
6379         if (sp == NULL) {
6380                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6381                 error = ENOMEM;
6382                 goto out_now;
6383         }
6384         sp->sinfo_flags = srcv->sinfo_flags;
6385         sp->timetolive = srcv->sinfo_timetolive;
6386         sp->ppid = srcv->sinfo_ppid;
6387         sp->context = srcv->sinfo_context;
6388         sp->fsn = 0;
6389         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6390                 sp->net = net;
6391                 atomic_add_int(&sp->net->ref_count, 1);
6392         } else {
6393                 sp->net = NULL;
6394         }
6395         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6396         sp->sid = srcv->sinfo_stream;
6397         sp->msg_is_complete = 1;
6398         sp->sender_all_done = 1;
6399         sp->some_taken = 0;
6400         sp->data = m;
6401         sp->tail_mbuf = NULL;
6402         sctp_set_prsctp_policy(sp);
6403         /*
6404          * We could in theory (for sendall) sifa the length in, but we would
6405          * still have to hunt through the chain since we need to setup the
6406          * tail_mbuf
6407          */
6408         sp->length = 0;
6409         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6410                 if (SCTP_BUF_NEXT(at) == NULL)
6411                         sp->tail_mbuf = at;
6412                 sp->length += SCTP_BUF_LEN(at);
6413         }
6414         if (srcv->sinfo_keynumber_valid) {
6415                 sp->auth_keyid = srcv->sinfo_keynumber;
6416         } else {
6417                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6418         }
6419         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6420                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6421                 sp->holds_key_ref = 1;
6422         }
6423         if (hold_stcb_lock == 0) {
6424                 SCTP_TCB_SEND_LOCK(stcb);
6425         }
6426         sctp_snd_sb_alloc(stcb, sp->length);
6427         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6428         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6429         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6430         m = NULL;
6431         if (hold_stcb_lock == 0) {
6432                 SCTP_TCB_SEND_UNLOCK(stcb);
6433         }
6434 out_now:
6435         if (m) {
6436                 sctp_m_freem(m);
6437         }
6438         return (error);
6439 }
6440
6441
6442 static struct mbuf *
6443 sctp_copy_mbufchain(struct mbuf *clonechain,
6444     struct mbuf *outchain,
6445     struct mbuf **endofchain,
6446     int can_take_mbuf,
6447     int sizeofcpy,
6448     uint8_t copy_by_ref)
6449 {
6450         struct mbuf *m;
6451         struct mbuf *appendchain;
6452         caddr_t cp;
6453         int len;
6454
6455         if (endofchain == NULL) {
6456                 /* error */
6457 error_out:
6458                 if (outchain)
6459                         sctp_m_freem(outchain);
6460                 return (NULL);
6461         }
6462         if (can_take_mbuf) {
6463                 appendchain = clonechain;
6464         } else {
6465                 if (!copy_by_ref &&
6466                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6467                     ) {
6468                         /* Its not in a cluster */
6469                         if (*endofchain == NULL) {
6470                                 /* lets get a mbuf cluster */
6471                                 if (outchain == NULL) {
6472                                         /* This is the general case */
6473                         new_mbuf:
6474                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6475                                         if (outchain == NULL) {
6476                                                 goto error_out;
6477                                         }
6478                                         SCTP_BUF_LEN(outchain) = 0;
6479                                         *endofchain = outchain;
6480                                         /* get the prepend space */
6481                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6482                                 } else {
6483                                         /*
6484                                          * We really should not get a NULL
6485                                          * in endofchain
6486                                          */
6487                                         /* find end */
6488                                         m = outchain;
6489                                         while (m) {
6490                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6491                                                         *endofchain = m;
6492                                                         break;
6493                                                 }
6494                                                 m = SCTP_BUF_NEXT(m);
6495                                         }
6496                                         /* sanity */
6497                                         if (*endofchain == NULL) {
6498                                                 /*
6499                                                  * huh, TSNH XXX maybe we
6500                                                  * should panic
6501                                                  */
6502                                                 sctp_m_freem(outchain);
6503                                                 goto new_mbuf;
6504                                         }
6505                                 }
6506                                 /* get the new end of length */
6507                                 len = (int)M_TRAILINGSPACE(*endofchain);
6508                         } else {
6509                                 /* how much is left at the end? */
6510                                 len = (int)M_TRAILINGSPACE(*endofchain);
6511                         }
6512                         /* Find the end of the data, for appending */
6513                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6514
6515                         /* Now lets copy it out */
6516                         if (len >= sizeofcpy) {
6517                                 /* It all fits, copy it in */
6518                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6519                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6520                         } else {
6521                                 /* fill up the end of the chain */
6522                                 if (len > 0) {
6523                                         m_copydata(clonechain, 0, len, cp);
6524                                         SCTP_BUF_LEN((*endofchain)) += len;
6525                                         /* now we need another one */
6526                                         sizeofcpy -= len;
6527                                 }
6528                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6529                                 if (m == NULL) {
6530                                         /* We failed */
6531                                         goto error_out;
6532                                 }
6533                                 SCTP_BUF_NEXT((*endofchain)) = m;
6534                                 *endofchain = m;
6535                                 cp = mtod((*endofchain), caddr_t);
6536                                 m_copydata(clonechain, len, sizeofcpy, cp);
6537                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6538                         }
6539                         return (outchain);
6540                 } else {
6541                         /* copy the old fashion way */
6542                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6543 #ifdef SCTP_MBUF_LOGGING
6544                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6545                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6546                         }
6547 #endif
6548                 }
6549         }
6550         if (appendchain == NULL) {
6551                 /* error */
6552                 if (outchain)
6553                         sctp_m_freem(outchain);
6554                 return (NULL);
6555         }
6556         if (outchain) {
6557                 /* tack on to the end */
6558                 if (*endofchain != NULL) {
6559                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6560                 } else {
6561                         m = outchain;
6562                         while (m) {
6563                                 if (SCTP_BUF_NEXT(m) == NULL) {
6564                                         SCTP_BUF_NEXT(m) = appendchain;
6565                                         break;
6566                                 }
6567                                 m = SCTP_BUF_NEXT(m);
6568                         }
6569                 }
6570                 /*
6571                  * save off the end and update the end-chain position
6572                  */
6573                 m = appendchain;
6574                 while (m) {
6575                         if (SCTP_BUF_NEXT(m) == NULL) {
6576                                 *endofchain = m;
6577                                 break;
6578                         }
6579                         m = SCTP_BUF_NEXT(m);
6580                 }
6581                 return (outchain);
6582         } else {
6583                 /* save off the end and update the end-chain position */
6584                 m = appendchain;
6585                 while (m) {
6586                         if (SCTP_BUF_NEXT(m) == NULL) {
6587                                 *endofchain = m;
6588                                 break;
6589                         }
6590                         m = SCTP_BUF_NEXT(m);
6591                 }
6592                 return (appendchain);
6593         }
6594 }
6595
6596 static int
6597 sctp_med_chunk_output(struct sctp_inpcb *inp,
6598     struct sctp_tcb *stcb,
6599     struct sctp_association *asoc,
6600     int *num_out,
6601     int *reason_code,
6602     int control_only, int from_where,
6603     struct timeval *now, int *now_filled, int frag_point, int so_locked
6604 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6605     SCTP_UNUSED
6606 #endif
6607 );
6608
6609 static void
6610 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6611     uint32_t val SCTP_UNUSED)
6612 {
6613         struct sctp_copy_all *ca;
6614         struct mbuf *m;
6615         int ret = 0;
6616         int added_control = 0;
6617         int un_sent, do_chunk_output = 1;
6618         struct sctp_association *asoc;
6619         struct sctp_nets *net;
6620
6621         ca = (struct sctp_copy_all *)ptr;
6622         if (ca->m == NULL) {
6623                 return;
6624         }
6625         if (ca->inp != inp) {
6626                 /* TSNH */
6627                 return;
6628         }
6629         if (ca->sndlen > 0) {
6630                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6631                 if (m == NULL) {
6632                         /* can't copy so we are done */
6633                         ca->cnt_failed++;
6634                         return;
6635                 }
6636 #ifdef SCTP_MBUF_LOGGING
6637                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6638                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6639                 }
6640 #endif
6641         } else {
6642                 m = NULL;
6643         }
6644         SCTP_TCB_LOCK_ASSERT(stcb);
6645         if (stcb->asoc.alternate) {
6646                 net = stcb->asoc.alternate;
6647         } else {
6648                 net = stcb->asoc.primary_destination;
6649         }
6650         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6651                 /* Abort this assoc with m as the user defined reason */
6652                 if (m != NULL) {
6653                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6654                 } else {
6655                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6656                             0, M_NOWAIT, 1, MT_DATA);
6657                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6658                 }
6659                 if (m != NULL) {
6660                         struct sctp_paramhdr *ph;
6661
6662                         ph = mtod(m, struct sctp_paramhdr *);
6663                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6664                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6665                 }
6666                 /*
6667                  * We add one here to keep the assoc from dis-appearing on
6668                  * us.
6669                  */
6670                 atomic_add_int(&stcb->asoc.refcnt, 1);
6671                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6672                 /*
6673                  * sctp_abort_an_association calls sctp_free_asoc() free
6674                  * association will NOT free it since we incremented the
6675                  * refcnt .. we do this to prevent it being freed and things
6676                  * getting tricky since we could end up (from free_asoc)
6677                  * calling inpcb_free which would get a recursive lock call
6678                  * to the iterator lock.. But as a consequence of that the
6679                  * stcb will return to us un-locked.. since free_asoc
6680                  * returns with either no TCB or the TCB unlocked, we must
6681                  * relock.. to unlock in the iterator timer :-0
6682                  */
6683                 SCTP_TCB_LOCK(stcb);
6684                 atomic_add_int(&stcb->asoc.refcnt, -1);
6685                 goto no_chunk_output;
6686         } else {
6687                 if (m) {
6688                         ret = sctp_msg_append(stcb, net, m,
6689                             &ca->sndrcv, 1);
6690                 }
6691                 asoc = &stcb->asoc;
6692                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6693                         /* shutdown this assoc */
6694                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6695                             TAILQ_EMPTY(&asoc->sent_queue) &&
6696                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6697                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6698                                         goto abort_anyway;
6699                                 }
6700                                 /*
6701                                  * there is nothing queued to send, so I'm
6702                                  * done...
6703                                  */
6704                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6705                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6706                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6707                                         /*
6708                                          * only send SHUTDOWN the first time
6709                                          * through
6710                                          */
6711                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6712                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6713                                         }
6714                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6715                                         sctp_stop_timers_for_shutdown(stcb);
6716                                         sctp_send_shutdown(stcb, net);
6717                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6718                                             net);
6719                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6720                                             asoc->primary_destination);
6721                                         added_control = 1;
6722                                         do_chunk_output = 0;
6723                                 }
6724                         } else {
6725                                 /*
6726                                  * we still got (or just got) data to send,
6727                                  * so set SHUTDOWN_PENDING
6728                                  */
6729                                 /*
6730                                  * XXX sockets draft says that SCTP_EOF
6731                                  * should be sent with no data.  currently,
6732                                  * we will allow user data to be sent first
6733                                  * and move to SHUTDOWN-PENDING
6734                                  */
6735                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6736                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6737                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6738                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6739                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6740                                         }
6741                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6742                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6743                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6744                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6745                                                 struct mbuf *op_err;
6746                                                 char msg[SCTP_DIAG_INFO_LEN];
6747
6748                                 abort_anyway:
6749                                                 snprintf(msg, sizeof(msg),
6750                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6751                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6752                                                     msg);
6753                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6754                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6755                                                     op_err, SCTP_SO_NOT_LOCKED);
6756                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6757                                                 goto no_chunk_output;
6758                                         }
6759                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6760                                             asoc->primary_destination);
6761                                 }
6762                         }
6763
6764                 }
6765         }
6766         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6767             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6768
6769         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6770             (stcb->asoc.total_flight > 0) &&
6771             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6772                 do_chunk_output = 0;
6773         }
6774         if (do_chunk_output)
6775                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6776         else if (added_control) {
6777                 int num_out, reason, now_filled = 0;
6778                 struct timeval now;
6779                 int frag_point;
6780
6781                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6782                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6783                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6784         }
6785 no_chunk_output:
6786         if (ret) {
6787                 ca->cnt_failed++;
6788         } else {
6789                 ca->cnt_sent++;
6790         }
6791 }
6792
6793 static void
6794 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6795 {
6796         struct sctp_copy_all *ca;
6797
6798         ca = (struct sctp_copy_all *)ptr;
6799         /*
6800          * Do a notify here? Kacheong suggests that the notify be done at
6801          * the send time.. so you would push up a notification if any send
6802          * failed. Don't know if this is feasible since the only failures we
6803          * have is "memory" related and if you cannot get an mbuf to send
6804          * the data you surely can't get an mbuf to send up to notify the
6805          * user you can't send the data :->
6806          */
6807
6808         /* now free everything */
6809         sctp_m_freem(ca->m);
6810         SCTP_FREE(ca, SCTP_M_COPYAL);
6811 }
6812
6813 static struct mbuf *
6814 sctp_copy_out_all(struct uio *uio, int len)
6815 {
6816         struct mbuf *ret, *at;
6817         int left, willcpy, cancpy, error;
6818
6819         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6820         if (ret == NULL) {
6821                 /* TSNH */
6822                 return (NULL);
6823         }
6824         left = len;
6825         SCTP_BUF_LEN(ret) = 0;
6826         /* save space for the data chunk header */
6827         cancpy = (int)M_TRAILINGSPACE(ret);
6828         willcpy = min(cancpy, left);
6829         at = ret;
6830         while (left > 0) {
6831                 /* Align data to the end */
6832                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6833                 if (error) {
6834         err_out_now:
6835                         sctp_m_freem(at);
6836                         return (NULL);
6837                 }
6838                 SCTP_BUF_LEN(at) = willcpy;
6839                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6840                 left -= willcpy;
6841                 if (left > 0) {
6842                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6843                         if (SCTP_BUF_NEXT(at) == NULL) {
6844                                 goto err_out_now;
6845                         }
6846                         at = SCTP_BUF_NEXT(at);
6847                         SCTP_BUF_LEN(at) = 0;
6848                         cancpy = (int)M_TRAILINGSPACE(at);
6849                         willcpy = min(cancpy, left);
6850                 }
6851         }
6852         return (ret);
6853 }
6854
6855 static int
6856 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6857     struct sctp_sndrcvinfo *srcv)
6858 {
6859         int ret;
6860         struct sctp_copy_all *ca;
6861
6862         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6863             SCTP_M_COPYAL);
6864         if (ca == NULL) {
6865                 sctp_m_freem(m);
6866                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6867                 return (ENOMEM);
6868         }
6869         memset(ca, 0, sizeof(struct sctp_copy_all));
6870
6871         ca->inp = inp;
6872         if (srcv) {
6873                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6874         }
6875         /*
6876          * take off the sendall flag, it would be bad if we failed to do
6877          * this :-0
6878          */
6879         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6880         /* get length and mbuf chain */
6881         if (uio) {
6882                 ca->sndlen = (int)uio->uio_resid;
6883                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6884                 if (ca->m == NULL) {
6885                         SCTP_FREE(ca, SCTP_M_COPYAL);
6886                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6887                         return (ENOMEM);
6888                 }
6889         } else {
6890                 /* Gather the length of the send */
6891                 struct mbuf *mat;
6892
6893                 ca->sndlen = 0;
6894                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6895                         ca->sndlen += SCTP_BUF_LEN(mat);
6896                 }
6897         }
6898         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6899             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6900             SCTP_ASOC_ANY_STATE,
6901             (void *)ca, 0,
6902             sctp_sendall_completes, inp, 1);
6903         if (ret) {
6904                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6905                 SCTP_FREE(ca, SCTP_M_COPYAL);
6906                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6907                 return (EFAULT);
6908         }
6909         return (0);
6910 }
6911
6912
6913 void
6914 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6915 {
6916         struct sctp_tmit_chunk *chk, *nchk;
6917
6918         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6919                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6920                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6921                         asoc->ctrl_queue_cnt--;
6922                         if (chk->data) {
6923                                 sctp_m_freem(chk->data);
6924                                 chk->data = NULL;
6925                         }
6926                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6927                 }
6928         }
6929 }
6930
6931 void
6932 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6933 {
6934         struct sctp_association *asoc;
6935         struct sctp_tmit_chunk *chk, *nchk;
6936         struct sctp_asconf_chunk *acp;
6937
6938         asoc = &stcb->asoc;
6939         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6940                 /* find SCTP_ASCONF chunk in queue */
6941                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6942                         if (chk->data) {
6943                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6944                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6945                                         /* Not Acked yet */
6946                                         break;
6947                                 }
6948                         }
6949                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6950                         asoc->ctrl_queue_cnt--;
6951                         if (chk->data) {
6952                                 sctp_m_freem(chk->data);
6953                                 chk->data = NULL;
6954                         }
6955                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6956                 }
6957         }
6958 }
6959
6960
6961 static void
6962 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6963     struct sctp_association *asoc,
6964     struct sctp_tmit_chunk **data_list,
6965     int bundle_at,
6966     struct sctp_nets *net)
6967 {
6968         int i;
6969         struct sctp_tmit_chunk *tp1;
6970
6971         for (i = 0; i < bundle_at; i++) {
6972                 /* off of the send queue */
6973                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6974                 asoc->send_queue_cnt--;
6975                 if (i > 0) {
6976                         /*
6977                          * Any chunk NOT 0 you zap the time chunk 0 gets
6978                          * zapped or set based on if a RTO measurment is
6979                          * needed.
6980                          */
6981                         data_list[i]->do_rtt = 0;
6982                 }
6983                 /* record time */
6984                 data_list[i]->sent_rcv_time = net->last_sent_time;
6985                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6986                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6987                 if (data_list[i]->whoTo == NULL) {
6988                         data_list[i]->whoTo = net;
6989                         atomic_add_int(&net->ref_count, 1);
6990                 }
6991                 /* on to the sent queue */
6992                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6993                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6994                         struct sctp_tmit_chunk *tpp;
6995
6996                         /* need to move back */
6997         back_up_more:
6998                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6999                         if (tpp == NULL) {
7000                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7001                                 goto all_done;
7002                         }
7003                         tp1 = tpp;
7004                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7005                                 goto back_up_more;
7006                         }
7007                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7008                 } else {
7009                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7010                             data_list[i],
7011                             sctp_next);
7012                 }
7013 all_done:
7014                 /* This does not lower until the cum-ack passes it */
7015                 asoc->sent_queue_cnt++;
7016                 if ((asoc->peers_rwnd <= 0) &&
7017                     (asoc->total_flight == 0) &&
7018                     (bundle_at == 1)) {
7019                         /* Mark the chunk as being a window probe */
7020                         SCTP_STAT_INCR(sctps_windowprobed);
7021                 }
7022 #ifdef SCTP_AUDITING_ENABLED
7023                 sctp_audit_log(0xC2, 3);
7024 #endif
7025                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7026                 data_list[i]->snd_count = 1;
7027                 data_list[i]->rec.data.chunk_was_revoked = 0;
7028                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7029                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7030                             data_list[i]->whoTo->flight_size,
7031                             data_list[i]->book_size,
7032                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7033                             data_list[i]->rec.data.tsn);
7034                 }
7035                 sctp_flight_size_increase(data_list[i]);
7036                 sctp_total_flight_increase(stcb, data_list[i]);
7037                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7038                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7039                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7040                 }
7041                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7042                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7043                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7044                         /* SWS sender side engages */
7045                         asoc->peers_rwnd = 0;
7046                 }
7047         }
7048         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7049                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7050         }
7051 }
7052
7053 static void
7054 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7055 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7056     SCTP_UNUSED
7057 #endif
7058 )
7059 {
7060         struct sctp_tmit_chunk *chk, *nchk;
7061
7062         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7063                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7064                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7065                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7066                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7067                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7068                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7069                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7070                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7071                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7072                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7073                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7074                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7075                         /* Stray chunks must be cleaned up */
7076         clean_up_anyway:
7077                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7078                         asoc->ctrl_queue_cnt--;
7079                         if (chk->data) {
7080                                 sctp_m_freem(chk->data);
7081                                 chk->data = NULL;
7082                         }
7083                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7084                                 asoc->fwd_tsn_cnt--;
7085                         }
7086                         sctp_free_a_chunk(stcb, chk, so_locked);
7087                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7088                         /* special handling, we must look into the param */
7089                         if (chk != asoc->str_reset) {
7090                                 goto clean_up_anyway;
7091                         }
7092                 }
7093         }
7094 }
7095
7096 static uint32_t
7097 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7098     uint32_t space_left, uint32_t frag_point, int eeor_on)
7099 {
7100         /*
7101          * Make a decision on if I should split a msg into multiple parts.
7102          * This is only asked of incomplete messages.
7103          */
7104         if (eeor_on) {
7105                 /*
7106                  * If we are doing EEOR we need to always send it if its the
7107                  * entire thing, since it might be all the guy is putting in
7108                  * the hopper.
7109                  */
7110                 if (space_left >= length) {
7111                         /*-
7112                          * If we have data outstanding,
7113                          * we get another chance when the sack
7114                          * arrives to transmit - wait for more data
7115                          */
7116                         if (stcb->asoc.total_flight == 0) {
7117                                 /*
7118                                  * If nothing is in flight, we zero the
7119                                  * packet counter.
7120                                  */
7121                                 return (length);
7122                         }
7123                         return (0);
7124
7125                 } else {
7126                         /* You can fill the rest */
7127                         return (space_left);
7128                 }
7129         }
7130         /*-
7131          * For those strange folk that make the send buffer
7132          * smaller than our fragmentation point, we can't
7133          * get a full msg in so we have to allow splitting.
7134          */
7135         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7136                 return (length);
7137         }
7138         if ((length <= space_left) ||
7139             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7140                 /* Sub-optimial residual don't split in non-eeor mode. */
7141                 return (0);
7142         }
7143         /*
7144          * If we reach here length is larger than the space_left. Do we wish
7145          * to split it for the sake of packet putting together?
7146          */
7147         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7148                 /* Its ok to split it */
7149                 return (min(space_left, frag_point));
7150         }
7151         /* Nope, can't split */
7152         return (0);
7153 }
7154
7155 static uint32_t
7156 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7157     struct sctp_stream_out *strq,
7158     uint32_t space_left,
7159     uint32_t frag_point,
7160     int *giveup,
7161     int eeor_mode,
7162     int *bail,
7163     int so_locked
7164 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7165     SCTP_UNUSED
7166 #endif
7167 )
7168 {
7169         /* Move from the stream to the send_queue keeping track of the total */
7170         struct sctp_association *asoc;
7171         struct sctp_stream_queue_pending *sp;
7172         struct sctp_tmit_chunk *chk;
7173         struct sctp_data_chunk *dchkh = NULL;
7174         struct sctp_idata_chunk *ndchkh = NULL;
7175         uint32_t to_move, length;
7176         int leading;
7177         uint8_t rcv_flags = 0;
7178         uint8_t some_taken;
7179         uint8_t send_lock_up = 0;
7180
7181         SCTP_TCB_LOCK_ASSERT(stcb);
7182         asoc = &stcb->asoc;
7183 one_more_time:
7184         /* sa_ignore FREED_MEMORY */
7185         sp = TAILQ_FIRST(&strq->outqueue);
7186         if (sp == NULL) {
7187                 if (send_lock_up == 0) {
7188                         SCTP_TCB_SEND_LOCK(stcb);
7189                         send_lock_up = 1;
7190                 }
7191                 sp = TAILQ_FIRST(&strq->outqueue);
7192                 if (sp) {
7193                         goto one_more_time;
7194                 }
7195                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7196                     (stcb->asoc.idata_supported == 0) &&
7197                     (strq->last_msg_incomplete)) {
7198                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7199                             strq->sid,
7200                             strq->last_msg_incomplete);
7201                         strq->last_msg_incomplete = 0;
7202                 }
7203                 to_move = 0;
7204                 if (send_lock_up) {
7205                         SCTP_TCB_SEND_UNLOCK(stcb);
7206                         send_lock_up = 0;
7207                 }
7208                 goto out_of;
7209         }
7210         if ((sp->msg_is_complete) && (sp->length == 0)) {
7211                 if (sp->sender_all_done) {
7212                         /*
7213                          * We are doing differed cleanup. Last time through
7214                          * when we took all the data the sender_all_done was
7215                          * not set.
7216                          */
7217                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7218                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7219                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7220                                     sp->sender_all_done,
7221                                     sp->length,
7222                                     sp->msg_is_complete,
7223                                     sp->put_last_out,
7224                                     send_lock_up);
7225                         }
7226                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7227                                 SCTP_TCB_SEND_LOCK(stcb);
7228                                 send_lock_up = 1;
7229                         }
7230                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7231                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7232                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7233                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7234                             (strq->chunks_on_queues == 0) &&
7235                             TAILQ_EMPTY(&strq->outqueue)) {
7236                                 stcb->asoc.trigger_reset = 1;
7237                         }
7238                         if (sp->net) {
7239                                 sctp_free_remote_addr(sp->net);
7240                                 sp->net = NULL;
7241                         }
7242                         if (sp->data) {
7243                                 sctp_m_freem(sp->data);
7244                                 sp->data = NULL;
7245                         }
7246                         sctp_free_a_strmoq(stcb, sp, so_locked);
7247                         /* we can't be locked to it */
7248                         if (send_lock_up) {
7249                                 SCTP_TCB_SEND_UNLOCK(stcb);
7250                                 send_lock_up = 0;
7251                         }
7252                         /* back to get the next msg */
7253                         goto one_more_time;
7254                 } else {
7255                         /*
7256                          * sender just finished this but still holds a
7257                          * reference
7258                          */
7259                         *giveup = 1;
7260                         to_move = 0;
7261                         goto out_of;
7262                 }
7263         } else {
7264                 /* is there some to get */
7265                 if (sp->length == 0) {
7266                         /* no */
7267                         *giveup = 1;
7268                         to_move = 0;
7269                         goto out_of;
7270                 } else if (sp->discard_rest) {
7271                         if (send_lock_up == 0) {
7272                                 SCTP_TCB_SEND_LOCK(stcb);
7273                                 send_lock_up = 1;
7274                         }
7275                         /* Whack down the size */
7276                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7277                         if ((stcb->sctp_socket != NULL) &&
7278                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7279                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7280                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7281                         }
7282                         if (sp->data) {
7283                                 sctp_m_freem(sp->data);
7284                                 sp->data = NULL;
7285                                 sp->tail_mbuf = NULL;
7286                         }
7287                         sp->length = 0;
7288                         sp->some_taken = 1;
7289                         *giveup = 1;
7290                         to_move = 0;
7291                         goto out_of;
7292                 }
7293         }
7294         some_taken = sp->some_taken;
7295 re_look:
7296         length = sp->length;
7297         if (sp->msg_is_complete) {
7298                 /* The message is complete */
7299                 to_move = min(length, frag_point);
7300                 if (to_move == length) {
7301                         /* All of it fits in the MTU */
7302                         if (sp->some_taken) {
7303                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7304                         } else {
7305                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7306                         }
7307                         sp->put_last_out = 1;
7308                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7309                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7310                         }
7311                 } else {
7312                         /* Not all of it fits, we fragment */
7313                         if (sp->some_taken == 0) {
7314                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7315                         }
7316                         sp->some_taken = 1;
7317                 }
7318         } else {
7319                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7320                 if (to_move) {
7321                         /*-
7322                          * We use a snapshot of length in case it
7323                          * is expanding during the compare.
7324                          */
7325                         uint32_t llen;
7326
7327                         llen = length;
7328                         if (to_move >= llen) {
7329                                 to_move = llen;
7330                                 if (send_lock_up == 0) {
7331                                         /*-
7332                                          * We are taking all of an incomplete msg
7333                                          * thus we need a send lock.
7334                                          */
7335                                         SCTP_TCB_SEND_LOCK(stcb);
7336                                         send_lock_up = 1;
7337                                         if (sp->msg_is_complete) {
7338                                                 /*
7339                                                  * the sender finished the
7340                                                  * msg
7341                                                  */
7342                                                 goto re_look;
7343                                         }
7344                                 }
7345                         }
7346                         if (sp->some_taken == 0) {
7347                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7348                                 sp->some_taken = 1;
7349                         }
7350                 } else {
7351                         /* Nothing to take. */
7352                         *giveup = 1;
7353                         to_move = 0;
7354                         goto out_of;
7355                 }
7356         }
7357
7358         /* If we reach here, we can copy out a chunk */
7359         sctp_alloc_a_chunk(stcb, chk);
7360         if (chk == NULL) {
7361                 /* No chunk memory */
7362                 *giveup = 1;
7363                 to_move = 0;
7364                 goto out_of;
7365         }
7366         /*
7367          * Setup for unordered if needed by looking at the user sent info
7368          * flags.
7369          */
7370         if (sp->sinfo_flags & SCTP_UNORDERED) {
7371                 rcv_flags |= SCTP_DATA_UNORDERED;
7372         }
7373         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7374             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7375                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7376         }
7377         /* clear out the chunk before setting up */
7378         memset(chk, 0, sizeof(*chk));
7379         chk->rec.data.rcv_flags = rcv_flags;
7380
7381         if (to_move >= length) {
7382                 /* we think we can steal the whole thing */
7383                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7384                         SCTP_TCB_SEND_LOCK(stcb);
7385                         send_lock_up = 1;
7386                 }
7387                 if (to_move < sp->length) {
7388                         /* bail, it changed */
7389                         goto dont_do_it;
7390                 }
7391                 chk->data = sp->data;
7392                 chk->last_mbuf = sp->tail_mbuf;
7393                 /* register the stealing */
7394                 sp->data = sp->tail_mbuf = NULL;
7395         } else {
7396                 struct mbuf *m;
7397
7398 dont_do_it:
7399                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7400                 chk->last_mbuf = NULL;
7401                 if (chk->data == NULL) {
7402                         sp->some_taken = some_taken;
7403                         sctp_free_a_chunk(stcb, chk, so_locked);
7404                         *bail = 1;
7405                         to_move = 0;
7406                         goto out_of;
7407                 }
7408 #ifdef SCTP_MBUF_LOGGING
7409                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7410                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7411                 }
7412 #endif
7413                 /* Pull off the data */
7414                 m_adj(sp->data, to_move);
7415                 /* Now lets work our way down and compact it */
7416                 m = sp->data;
7417                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7418                         sp->data = SCTP_BUF_NEXT(m);
7419                         SCTP_BUF_NEXT(m) = NULL;
7420                         if (sp->tail_mbuf == m) {
7421                                 /*-
7422                                  * Freeing tail? TSNH since
7423                                  * we supposedly were taking less
7424                                  * than the sp->length.
7425                                  */
7426 #ifdef INVARIANTS
7427                                 panic("Huh, freing tail? - TSNH");
7428 #else
7429                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7430                                 sp->tail_mbuf = sp->data = NULL;
7431                                 sp->length = 0;
7432 #endif
7433
7434                         }
7435                         sctp_m_free(m);
7436                         m = sp->data;
7437                 }
7438         }
7439         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7440                 chk->copy_by_ref = 1;
7441         } else {
7442                 chk->copy_by_ref = 0;
7443         }
7444         /*
7445          * get last_mbuf and counts of mb usage This is ugly but hopefully
7446          * its only one mbuf.
7447          */
7448         if (chk->last_mbuf == NULL) {
7449                 chk->last_mbuf = chk->data;
7450                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7451                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7452                 }
7453         }
7454
7455         if (to_move > length) {
7456                 /*- This should not happen either
7457                  * since we always lower to_move to the size
7458                  * of sp->length if its larger.
7459                  */
7460 #ifdef INVARIANTS
7461                 panic("Huh, how can to_move be larger?");
7462 #else
7463                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7464                 sp->length = 0;
7465 #endif
7466         } else {
7467                 atomic_subtract_int(&sp->length, to_move);
7468         }
7469         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7470         if (M_LEADINGSPACE(chk->data) < leading) {
7471                 /* Not enough room for a chunk header, get some */
7472                 struct mbuf *m;
7473
7474                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7475                 if (m == NULL) {
7476                         /*
7477                          * we're in trouble here. _PREPEND below will free
7478                          * all the data if there is no leading space, so we
7479                          * must put the data back and restore.
7480                          */
7481                         if (send_lock_up == 0) {
7482                                 SCTP_TCB_SEND_LOCK(stcb);
7483                                 send_lock_up = 1;
7484                         }
7485                         if (sp->data == NULL) {
7486                                 /* unsteal the data */
7487                                 sp->data = chk->data;
7488                                 sp->tail_mbuf = chk->last_mbuf;
7489                         } else {
7490                                 struct mbuf *m_tmp;
7491
7492                                 /* reassemble the data */
7493                                 m_tmp = sp->data;
7494                                 sp->data = chk->data;
7495                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7496                         }
7497                         sp->some_taken = some_taken;
7498                         atomic_add_int(&sp->length, to_move);
7499                         chk->data = NULL;
7500                         *bail = 1;
7501                         sctp_free_a_chunk(stcb, chk, so_locked);
7502                         to_move = 0;
7503                         goto out_of;
7504                 } else {
7505                         SCTP_BUF_LEN(m) = 0;
7506                         SCTP_BUF_NEXT(m) = chk->data;
7507                         chk->data = m;
7508                         M_ALIGN(chk->data, 4);
7509                 }
7510         }
7511         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7512         if (chk->data == NULL) {
7513                 /* HELP, TSNH since we assured it would not above? */
7514 #ifdef INVARIANTS
7515                 panic("prepend failes HELP?");
7516 #else
7517                 SCTP_PRINTF("prepend fails HELP?\n");
7518                 sctp_free_a_chunk(stcb, chk, so_locked);
7519 #endif
7520                 *bail = 1;
7521                 to_move = 0;
7522                 goto out_of;
7523         }
7524         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7525         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7526         chk->book_size_scale = 0;
7527         chk->sent = SCTP_DATAGRAM_UNSENT;
7528
7529         chk->flags = 0;
7530         chk->asoc = &stcb->asoc;
7531         chk->pad_inplace = 0;
7532         chk->no_fr_allowed = 0;
7533         if (stcb->asoc.idata_supported == 0) {
7534                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7535                         /* Just use 0. The receiver ignores the values. */
7536                         chk->rec.data.mid = 0;
7537                 } else {
7538                         chk->rec.data.mid = strq->next_mid_ordered;
7539                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7540                                 strq->next_mid_ordered++;
7541                         }
7542                 }
7543         } else {
7544                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7545                         chk->rec.data.mid = strq->next_mid_unordered;
7546                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7547                                 strq->next_mid_unordered++;
7548                         }
7549                 } else {
7550                         chk->rec.data.mid = strq->next_mid_ordered;
7551                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7552                                 strq->next_mid_ordered++;
7553                         }
7554                 }
7555         }
7556         chk->rec.data.sid = sp->sid;
7557         chk->rec.data.ppid = sp->ppid;
7558         chk->rec.data.context = sp->context;
7559         chk->rec.data.doing_fast_retransmit = 0;
7560
7561         chk->rec.data.timetodrop = sp->ts;
7562         chk->flags = sp->act_flags;
7563
7564         if (sp->net) {
7565                 chk->whoTo = sp->net;
7566                 atomic_add_int(&chk->whoTo->ref_count, 1);
7567         } else
7568                 chk->whoTo = NULL;
7569
7570         if (sp->holds_key_ref) {
7571                 chk->auth_keyid = sp->auth_keyid;
7572                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7573                 chk->holds_key_ref = 1;
7574         }
7575         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7576         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7577                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7578                     (uint32_t)(uintptr_t)stcb, sp->length,
7579                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7580                     chk->rec.data.tsn);
7581         }
7582         if (stcb->asoc.idata_supported == 0) {
7583                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7584         } else {
7585                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7586         }
7587         /*
7588          * Put the rest of the things in place now. Size was done earlier in
7589          * previous loop prior to padding.
7590          */
7591
7592 #ifdef SCTP_ASOCLOG_OF_TSNS
7593         SCTP_TCB_LOCK_ASSERT(stcb);
7594         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7595                 asoc->tsn_out_at = 0;
7596                 asoc->tsn_out_wrapped = 1;
7597         }
7598         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7599         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7600         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7601         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7602         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7603         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7604         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7605         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7606         asoc->tsn_out_at++;
7607 #endif
7608         if (stcb->asoc.idata_supported == 0) {
7609                 dchkh->ch.chunk_type = SCTP_DATA;
7610                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7611                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7612                 dchkh->dp.sid = htons(strq->sid);
7613                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7614                 dchkh->dp.ppid = chk->rec.data.ppid;
7615                 dchkh->ch.chunk_length = htons(chk->send_size);
7616         } else {
7617                 ndchkh->ch.chunk_type = SCTP_IDATA;
7618                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7619                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7620                 ndchkh->dp.sid = htons(strq->sid);
7621                 ndchkh->dp.reserved = htons(0);
7622                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7623                 if (sp->fsn == 0)
7624                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7625                 else
7626                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7627                 sp->fsn++;
7628                 ndchkh->ch.chunk_length = htons(chk->send_size);
7629         }
7630         /* Now advance the chk->send_size by the actual pad needed. */
7631         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7632                 /* need a pad */
7633                 struct mbuf *lm;
7634                 int pads;
7635
7636                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7637                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7638                 if (lm != NULL) {
7639                         chk->last_mbuf = lm;
7640                         chk->pad_inplace = 1;
7641                 }
7642                 chk->send_size += pads;
7643         }
7644         if (PR_SCTP_ENABLED(chk->flags)) {
7645                 asoc->pr_sctp_cnt++;
7646         }
7647         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7648                 /* All done pull and kill the message */
7649                 if (sp->put_last_out == 0) {
7650                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7651                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7652                             sp->sender_all_done,
7653                             sp->length,
7654                             sp->msg_is_complete,
7655                             sp->put_last_out,
7656                             send_lock_up);
7657                 }
7658                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7659                         SCTP_TCB_SEND_LOCK(stcb);
7660                         send_lock_up = 1;
7661                 }
7662                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7663                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7664                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7665                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7666                     (strq->chunks_on_queues == 0) &&
7667                     TAILQ_EMPTY(&strq->outqueue)) {
7668                         stcb->asoc.trigger_reset = 1;
7669                 }
7670                 if (sp->net) {
7671                         sctp_free_remote_addr(sp->net);
7672                         sp->net = NULL;
7673                 }
7674                 if (sp->data) {
7675                         sctp_m_freem(sp->data);
7676                         sp->data = NULL;
7677                 }
7678                 sctp_free_a_strmoq(stcb, sp, so_locked);
7679         }
7680         asoc->chunks_on_out_queue++;
7681         strq->chunks_on_queues++;
7682         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7683         asoc->send_queue_cnt++;
7684 out_of:
7685         if (send_lock_up) {
7686                 SCTP_TCB_SEND_UNLOCK(stcb);
7687         }
7688         return (to_move);
7689 }
7690
7691
7692 static void
7693 sctp_fill_outqueue(struct sctp_tcb *stcb,
7694     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7695 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7696     SCTP_UNUSED
7697 #endif
7698 )
7699 {
7700         struct sctp_association *asoc;
7701         struct sctp_stream_out *strq;
7702         uint32_t space_left, moved, total_moved;
7703         int bail, giveup;
7704
7705         SCTP_TCB_LOCK_ASSERT(stcb);
7706         asoc = &stcb->asoc;
7707         total_moved = 0;
7708         switch (net->ro._l_addr.sa.sa_family) {
7709 #ifdef INET
7710         case AF_INET:
7711                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7712                 break;
7713 #endif
7714 #ifdef INET6
7715         case AF_INET6:
7716                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7717                 break;
7718 #endif
7719         default:
7720                 /* TSNH */
7721                 space_left = net->mtu;
7722                 break;
7723         }
7724         /* Need an allowance for the data chunk header too */
7725         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7726
7727         /* must make even word boundary */
7728         space_left &= 0xfffffffc;
7729         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7730         giveup = 0;
7731         bail = 0;
7732         while ((space_left > 0) && (strq != NULL)) {
7733                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7734                     &giveup, eeor_mode, &bail, so_locked);
7735                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7736                 if ((giveup != 0) || (bail != 0)) {
7737                         break;
7738                 }
7739                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7740                 total_moved += moved;
7741                 space_left -= moved;
7742                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7743                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7744                 } else {
7745                         space_left = 0;
7746                 }
7747                 space_left &= 0xfffffffc;
7748         }
7749         if (bail != 0)
7750                 *quit_now = 1;
7751
7752         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7753
7754         if (total_moved == 0) {
7755                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7756                     (net == stcb->asoc.primary_destination)) {
7757                         /* ran dry for primary network net */
7758                         SCTP_STAT_INCR(sctps_primary_randry);
7759                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7760                         /* ran dry with CMT on */
7761                         SCTP_STAT_INCR(sctps_cmt_randry);
7762                 }
7763         }
7764 }
7765
7766 void
7767 sctp_fix_ecn_echo(struct sctp_association *asoc)
7768 {
7769         struct sctp_tmit_chunk *chk;
7770
7771         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7772                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7773                         chk->sent = SCTP_DATAGRAM_UNSENT;
7774                 }
7775         }
7776 }
7777
7778 void
7779 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7780 {
7781         struct sctp_association *asoc;
7782         struct sctp_tmit_chunk *chk;
7783         struct sctp_stream_queue_pending *sp;
7784         unsigned int i;
7785
7786         if (net == NULL) {
7787                 return;
7788         }
7789         asoc = &stcb->asoc;
7790         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7791                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7792                         if (sp->net == net) {
7793                                 sctp_free_remote_addr(sp->net);
7794                                 sp->net = NULL;
7795                         }
7796                 }
7797         }
7798         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7799                 if (chk->whoTo == net) {
7800                         sctp_free_remote_addr(chk->whoTo);
7801                         chk->whoTo = NULL;
7802                 }
7803         }
7804 }
7805
7806 int
7807 sctp_med_chunk_output(struct sctp_inpcb *inp,
7808     struct sctp_tcb *stcb,
7809     struct sctp_association *asoc,
7810     int *num_out,
7811     int *reason_code,
7812     int control_only, int from_where,
7813     struct timeval *now, int *now_filled, int frag_point, int so_locked
7814 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7815     SCTP_UNUSED
7816 #endif
7817 )
7818 {
7819         /**
7820          * Ok this is the generic chunk service queue. we must do the
7821          * following:
7822          * - Service the stream queue that is next, moving any
7823          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7824          *   LAST to the out queue in one pass) and assigning TSN's. This
7825          *   only applys though if the peer does not support NDATA. For NDATA
7826          *   chunks its ok to not send the entire message ;-)
7827          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7828          *   fomulate and send the low level chunks. Making sure to combine
7829          *   any control in the control chunk queue also.
7830          */
7831         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7832         struct mbuf *outchain, *endoutchain;
7833         struct sctp_tmit_chunk *chk, *nchk;
7834
7835         /* temp arrays for unlinking */
7836         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7837         int no_fragmentflg, error;
7838         unsigned int max_rwnd_per_dest, max_send_per_dest;
7839         int one_chunk, hbflag, skip_data_for_this_net;
7840         int asconf, cookie, no_out_cnt;
7841         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7842         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7843         int tsns_sent = 0;
7844         uint32_t auth_offset = 0;
7845         struct sctp_auth_chunk *auth = NULL;
7846         uint16_t auth_keyid;
7847         int override_ok = 1;
7848         int skip_fill_up = 0;
7849         int data_auth_reqd = 0;
7850
7851         /*
7852          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7853          * destination.
7854          */
7855         int quit_now = 0;
7856
7857         *num_out = 0;
7858         *reason_code = 0;
7859         auth_keyid = stcb->asoc.authinfo.active_keyid;
7860         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7861             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7862             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7863                 eeor_mode = 1;
7864         } else {
7865                 eeor_mode = 0;
7866         }
7867         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7868         /*
7869          * First lets prime the pump. For each destination, if there is room
7870          * in the flight size, attempt to pull an MTU's worth out of the
7871          * stream queues into the general send_queue
7872          */
7873 #ifdef SCTP_AUDITING_ENABLED
7874         sctp_audit_log(0xC2, 2);
7875 #endif
7876         SCTP_TCB_LOCK_ASSERT(stcb);
7877         hbflag = 0;
7878         if (control_only)
7879                 no_data_chunks = 1;
7880         else
7881                 no_data_chunks = 0;
7882
7883         /* Nothing to possible to send? */
7884         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7885             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7886             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7887             TAILQ_EMPTY(&asoc->send_queue) &&
7888             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7889 nothing_to_send:
7890                 *reason_code = 9;
7891                 return (0);
7892         }
7893         if (asoc->peers_rwnd == 0) {
7894                 /* No room in peers rwnd */
7895                 *reason_code = 1;
7896                 if (asoc->total_flight > 0) {
7897                         /* we are allowed one chunk in flight */
7898                         no_data_chunks = 1;
7899                 }
7900         }
7901         if (stcb->asoc.ecn_echo_cnt_onq) {
7902                 /* Record where a sack goes, if any */
7903                 if (no_data_chunks &&
7904                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7905                         /* Nothing but ECNe to send - we don't do that */
7906                         goto nothing_to_send;
7907                 }
7908                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7909                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7910                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7911                                 sack_goes_to = chk->whoTo;
7912                                 break;
7913                         }
7914                 }
7915         }
7916         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7917         if (stcb->sctp_socket)
7918                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7919         else
7920                 max_send_per_dest = 0;
7921         if (no_data_chunks == 0) {
7922                 /* How many non-directed chunks are there? */
7923                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7924                         if (chk->whoTo == NULL) {
7925                                 /*
7926                                  * We already have non-directed chunks on
7927                                  * the queue, no need to do a fill-up.
7928                                  */
7929                                 skip_fill_up = 1;
7930                                 break;
7931                         }
7932                 }
7933
7934         }
7935         if ((no_data_chunks == 0) &&
7936             (skip_fill_up == 0) &&
7937             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7938                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7939                         /*
7940                          * This for loop we are in takes in each net, if
7941                          * its's got space in cwnd and has data sent to it
7942                          * (when CMT is off) then it calls
7943                          * sctp_fill_outqueue for the net. This gets data on
7944                          * the send queue for that network.
7945                          *
7946                          * In sctp_fill_outqueue TSN's are assigned and data
7947                          * is copied out of the stream buffers. Note mostly
7948                          * copy by reference (we hope).
7949                          */
7950                         net->window_probe = 0;
7951                         if ((net != stcb->asoc.alternate) &&
7952                             ((net->dest_state & SCTP_ADDR_PF) ||
7953                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7954                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7955                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7956                                         sctp_log_cwnd(stcb, net, 1,
7957                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7958                                 }
7959                                 continue;
7960                         }
7961                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7962                             (net->flight_size == 0)) {
7963                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7964                         }
7965                         if (net->flight_size >= net->cwnd) {
7966                                 /* skip this network, no room - can't fill */
7967                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7968                                         sctp_log_cwnd(stcb, net, 3,
7969                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7970                                 }
7971                                 continue;
7972                         }
7973                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7974                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7975                         }
7976                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7977                         if (quit_now) {
7978                                 /* memory alloc failure */
7979                                 no_data_chunks = 1;
7980                                 break;
7981                         }
7982                 }
7983         }
7984         /* now service each destination and send out what we can for it */
7985         /* Nothing to send? */
7986         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7987             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7988             TAILQ_EMPTY(&asoc->send_queue)) {
7989                 *reason_code = 8;
7990                 return (0);
7991         }
7992
7993         if (asoc->sctp_cmt_on_off > 0) {
7994                 /* get the last start point */
7995                 start_at = asoc->last_net_cmt_send_started;
7996                 if (start_at == NULL) {
7997                         /* null so to beginning */
7998                         start_at = TAILQ_FIRST(&asoc->nets);
7999                 } else {
8000                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8001                         if (start_at == NULL) {
8002                                 start_at = TAILQ_FIRST(&asoc->nets);
8003                         }
8004                 }
8005                 asoc->last_net_cmt_send_started = start_at;
8006         } else {
8007                 start_at = TAILQ_FIRST(&asoc->nets);
8008         }
8009         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8010                 if (chk->whoTo == NULL) {
8011                         if (asoc->alternate) {
8012                                 chk->whoTo = asoc->alternate;
8013                         } else {
8014                                 chk->whoTo = asoc->primary_destination;
8015                         }
8016                         atomic_add_int(&chk->whoTo->ref_count, 1);
8017                 }
8018         }
8019         old_start_at = NULL;
8020 again_one_more_time:
8021         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8022                 /* how much can we send? */
8023                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8024                 if (old_start_at && (old_start_at == net)) {
8025                         /* through list ocmpletely. */
8026                         break;
8027                 }
8028                 tsns_sent = 0xa;
8029                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8030                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8031                     (net->flight_size >= net->cwnd)) {
8032                         /*
8033                          * Nothing on control or asconf and flight is full,
8034                          * we can skip even in the CMT case.
8035                          */
8036                         continue;
8037                 }
8038                 bundle_at = 0;
8039                 endoutchain = outchain = NULL;
8040                 no_fragmentflg = 1;
8041                 one_chunk = 0;
8042                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8043                         skip_data_for_this_net = 1;
8044                 } else {
8045                         skip_data_for_this_net = 0;
8046                 }
8047                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8048 #ifdef INET
8049                 case AF_INET:
8050                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8051                         break;
8052 #endif
8053 #ifdef INET6
8054                 case AF_INET6:
8055                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8056                         break;
8057 #endif
8058                 default:
8059                         /* TSNH */
8060                         mtu = net->mtu;
8061                         break;
8062                 }
8063                 mx_mtu = mtu;
8064                 to_out = 0;
8065                 if (mtu > asoc->peers_rwnd) {
8066                         if (asoc->total_flight > 0) {
8067                                 /* We have a packet in flight somewhere */
8068                                 r_mtu = asoc->peers_rwnd;
8069                         } else {
8070                                 /* We are always allowed to send one MTU out */
8071                                 one_chunk = 1;
8072                                 r_mtu = mtu;
8073                         }
8074                 } else {
8075                         r_mtu = mtu;
8076                 }
8077                 error = 0;
8078                 /************************/
8079                 /* ASCONF transmission */
8080                 /************************/
8081                 /* Now first lets go through the asconf queue */
8082                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8083                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8084                                 continue;
8085                         }
8086                         if (chk->whoTo == NULL) {
8087                                 if (asoc->alternate == NULL) {
8088                                         if (asoc->primary_destination != net) {
8089                                                 break;
8090                                         }
8091                                 } else {
8092                                         if (asoc->alternate != net) {
8093                                                 break;
8094                                         }
8095                                 }
8096                         } else {
8097                                 if (chk->whoTo != net) {
8098                                         break;
8099                                 }
8100                         }
8101                         if (chk->data == NULL) {
8102                                 break;
8103                         }
8104                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8105                             chk->sent != SCTP_DATAGRAM_RESEND) {
8106                                 break;
8107                         }
8108                         /*
8109                          * if no AUTH is yet included and this chunk
8110                          * requires it, make sure to account for it.  We
8111                          * don't apply the size until the AUTH chunk is
8112                          * actually added below in case there is no room for
8113                          * this chunk. NOTE: we overload the use of "omtu"
8114                          * here
8115                          */
8116                         if ((auth == NULL) &&
8117                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8118                             stcb->asoc.peer_auth_chunks)) {
8119                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8120                         } else
8121                                 omtu = 0;
8122                         /* Here we do NOT factor the r_mtu */
8123                         if ((chk->send_size < (int)(mtu - omtu)) ||
8124                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8125                                 /*
8126                                  * We probably should glom the mbuf chain
8127                                  * from the chk->data for control but the
8128                                  * problem is it becomes yet one more level
8129                                  * of tracking to do if for some reason
8130                                  * output fails. Then I have got to
8131                                  * reconstruct the merged control chain.. el
8132                                  * yucko.. for now we take the easy way and
8133                                  * do the copy
8134                                  */
8135                                 /*
8136                                  * Add an AUTH chunk, if chunk requires it
8137                                  * save the offset into the chain for AUTH
8138                                  */
8139                                 if ((auth == NULL) &&
8140                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8141                                     stcb->asoc.peer_auth_chunks))) {
8142                                         outchain = sctp_add_auth_chunk(outchain,
8143                                             &endoutchain,
8144                                             &auth,
8145                                             &auth_offset,
8146                                             stcb,
8147                                             chk->rec.chunk_id.id);
8148                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8149                                 }
8150                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8151                                     (int)chk->rec.chunk_id.can_take_data,
8152                                     chk->send_size, chk->copy_by_ref);
8153                                 if (outchain == NULL) {
8154                                         *reason_code = 8;
8155                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8156                                         return (ENOMEM);
8157                                 }
8158                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8159                                 /* update our MTU size */
8160                                 if (mtu > (chk->send_size + omtu))
8161                                         mtu -= (chk->send_size + omtu);
8162                                 else
8163                                         mtu = 0;
8164                                 to_out += (chk->send_size + omtu);
8165                                 /* Do clear IP_DF ? */
8166                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8167                                         no_fragmentflg = 0;
8168                                 }
8169                                 if (chk->rec.chunk_id.can_take_data)
8170                                         chk->data = NULL;
8171                                 /*
8172                                  * set hb flag since we can use these for
8173                                  * RTO
8174                                  */
8175                                 hbflag = 1;
8176                                 asconf = 1;
8177                                 /*
8178                                  * should sysctl this: don't bundle data
8179                                  * with ASCONF since it requires AUTH
8180                                  */
8181                                 no_data_chunks = 1;
8182                                 chk->sent = SCTP_DATAGRAM_SENT;
8183                                 if (chk->whoTo == NULL) {
8184                                         chk->whoTo = net;
8185                                         atomic_add_int(&net->ref_count, 1);
8186                                 }
8187                                 chk->snd_count++;
8188                                 if (mtu == 0) {
8189                                         /*
8190                                          * Ok we are out of room but we can
8191                                          * output without effecting the
8192                                          * flight size since this little guy
8193                                          * is a control only packet.
8194                                          */
8195                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8196                                         /*
8197                                          * do NOT clear the asconf flag as
8198                                          * it is used to do appropriate
8199                                          * source address selection.
8200                                          */
8201                                         if (*now_filled == 0) {
8202                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8203                                                 *now_filled = 1;
8204                                         }
8205                                         net->last_sent_time = *now;
8206                                         hbflag = 0;
8207                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8208                                             (struct sockaddr *)&net->ro._l_addr,
8209                                             outchain, auth_offset, auth,
8210                                             stcb->asoc.authinfo.active_keyid,
8211                                             no_fragmentflg, 0, asconf,
8212                                             inp->sctp_lport, stcb->rport,
8213                                             htonl(stcb->asoc.peer_vtag),
8214                                             net->port, NULL,
8215                                             0, 0,
8216                                             so_locked))) {
8217                                                 /*
8218                                                  * error, we could not
8219                                                  * output
8220                                                  */
8221                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8222                                                 if (from_where == 0) {
8223                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8224                                                 }
8225                                                 if (error == ENOBUFS) {
8226                                                         asoc->ifp_had_enobuf = 1;
8227                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8228                                                 }
8229                                                 /* error, could not output */
8230                                                 if (error == EHOSTUNREACH) {
8231                                                         /*
8232                                                          * Destination went
8233                                                          * unreachable
8234                                                          * during this send
8235                                                          */
8236                                                         sctp_move_chunks_from_net(stcb, net);
8237                                                 }
8238                                                 *reason_code = 7;
8239                                                 break;
8240                                         } else {
8241                                                 asoc->ifp_had_enobuf = 0;
8242                                         }
8243                                         /*
8244                                          * increase the number we sent, if a
8245                                          * cookie is sent we don't tell them
8246                                          * any was sent out.
8247                                          */
8248                                         outchain = endoutchain = NULL;
8249                                         auth = NULL;
8250                                         auth_offset = 0;
8251                                         if (!no_out_cnt)
8252                                                 *num_out += ctl_cnt;
8253                                         /* recalc a clean slate and setup */
8254                                         switch (net->ro._l_addr.sa.sa_family) {
8255 #ifdef INET
8256                                         case AF_INET:
8257                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8258                                                 break;
8259 #endif
8260 #ifdef INET6
8261                                         case AF_INET6:
8262                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8263                                                 break;
8264 #endif
8265                                         default:
8266                                                 /* TSNH */
8267                                                 mtu = net->mtu;
8268                                                 break;
8269                                         }
8270                                         to_out = 0;
8271                                         no_fragmentflg = 1;
8272                                 }
8273                         }
8274                 }
8275                 if (error != 0) {
8276                         /* try next net */
8277                         continue;
8278                 }
8279                 /************************/
8280                 /* Control transmission */
8281                 /************************/
8282                 /* Now first lets go through the control queue */
8283                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8284                         if ((sack_goes_to) &&
8285                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8286                             (chk->whoTo != sack_goes_to)) {
8287                                 /*
8288                                  * if we have a sack in queue, and we are
8289                                  * looking at an ecn echo that is NOT queued
8290                                  * to where the sack is going..
8291                                  */
8292                                 if (chk->whoTo == net) {
8293                                         /*
8294                                          * Don't transmit it to where its
8295                                          * going (current net)
8296                                          */
8297                                         continue;
8298                                 } else if (sack_goes_to == net) {
8299                                         /*
8300                                          * But do transmit it to this
8301                                          * address
8302                                          */
8303                                         goto skip_net_check;
8304                                 }
8305                         }
8306                         if (chk->whoTo == NULL) {
8307                                 if (asoc->alternate == NULL) {
8308                                         if (asoc->primary_destination != net) {
8309                                                 continue;
8310                                         }
8311                                 } else {
8312                                         if (asoc->alternate != net) {
8313                                                 continue;
8314                                         }
8315                                 }
8316                         } else {
8317                                 if (chk->whoTo != net) {
8318                                         continue;
8319                                 }
8320                         }
8321         skip_net_check:
8322                         if (chk->data == NULL) {
8323                                 continue;
8324                         }
8325                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8326                                 /*
8327                                  * It must be unsent. Cookies and ASCONF's
8328                                  * hang around but there timers will force
8329                                  * when marked for resend.
8330                                  */
8331                                 continue;
8332                         }
8333                         /*
8334                          * if no AUTH is yet included and this chunk
8335                          * requires it, make sure to account for it.  We
8336                          * don't apply the size until the AUTH chunk is
8337                          * actually added below in case there is no room for
8338                          * this chunk. NOTE: we overload the use of "omtu"
8339                          * here
8340                          */
8341                         if ((auth == NULL) &&
8342                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8343                             stcb->asoc.peer_auth_chunks)) {
8344                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8345                         } else
8346                                 omtu = 0;
8347                         /* Here we do NOT factor the r_mtu */
8348                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8349                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8350                                 /*
8351                                  * We probably should glom the mbuf chain
8352                                  * from the chk->data for control but the
8353                                  * problem is it becomes yet one more level
8354                                  * of tracking to do if for some reason
8355                                  * output fails. Then I have got to
8356                                  * reconstruct the merged control chain.. el
8357                                  * yucko.. for now we take the easy way and
8358                                  * do the copy
8359                                  */
8360                                 /*
8361                                  * Add an AUTH chunk, if chunk requires it
8362                                  * save the offset into the chain for AUTH
8363                                  */
8364                                 if ((auth == NULL) &&
8365                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8366                                     stcb->asoc.peer_auth_chunks))) {
8367                                         outchain = sctp_add_auth_chunk(outchain,
8368                                             &endoutchain,
8369                                             &auth,
8370                                             &auth_offset,
8371                                             stcb,
8372                                             chk->rec.chunk_id.id);
8373                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8374                                 }
8375                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8376                                     (int)chk->rec.chunk_id.can_take_data,
8377                                     chk->send_size, chk->copy_by_ref);
8378                                 if (outchain == NULL) {
8379                                         *reason_code = 8;
8380                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8381                                         return (ENOMEM);
8382                                 }
8383                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8384                                 /* update our MTU size */
8385                                 if (mtu > (chk->send_size + omtu))
8386                                         mtu -= (chk->send_size + omtu);
8387                                 else
8388                                         mtu = 0;
8389                                 to_out += (chk->send_size + omtu);
8390                                 /* Do clear IP_DF ? */
8391                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8392                                         no_fragmentflg = 0;
8393                                 }
8394                                 if (chk->rec.chunk_id.can_take_data)
8395                                         chk->data = NULL;
8396                                 /* Mark things to be removed, if needed */
8397                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8398                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8399                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8400                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8401                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8402                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8403                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8404                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8405                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8406                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8407                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8408                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8409                                                 hbflag = 1;
8410                                         }
8411                                         /* remove these chunks at the end */
8412                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8413                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8414                                                 /* turn off the timer */
8415                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8416                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8417                                                             inp, stcb, net,
8418                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8419                                                 }
8420                                         }
8421                                         ctl_cnt++;
8422                                 } else {
8423                                         /*
8424                                          * Other chunks, since they have
8425                                          * timers running (i.e. COOKIE) we
8426                                          * just "trust" that it gets sent or
8427                                          * retransmitted.
8428                                          */
8429                                         ctl_cnt++;
8430                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8431                                                 cookie = 1;
8432                                                 no_out_cnt = 1;
8433                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8434                                                 /*
8435                                                  * Increment ecne send count
8436                                                  * here this means we may be
8437                                                  * over-zealous in our
8438                                                  * counting if the send
8439                                                  * fails, but its the best
8440                                                  * place to do it (we used
8441                                                  * to do it in the queue of
8442                                                  * the chunk, but that did
8443                                                  * not tell how many times
8444                                                  * it was sent.
8445                                                  */
8446                                                 SCTP_STAT_INCR(sctps_sendecne);
8447                                         }
8448                                         chk->sent = SCTP_DATAGRAM_SENT;
8449                                         if (chk->whoTo == NULL) {
8450                                                 chk->whoTo = net;
8451                                                 atomic_add_int(&net->ref_count, 1);
8452                                         }
8453                                         chk->snd_count++;
8454                                 }
8455                                 if (mtu == 0) {
8456                                         /*
8457                                          * Ok we are out of room but we can
8458                                          * output without effecting the
8459                                          * flight size since this little guy
8460                                          * is a control only packet.
8461                                          */
8462                                         if (asconf) {
8463                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8464                                                 /*
8465                                                  * do NOT clear the asconf
8466                                                  * flag as it is used to do
8467                                                  * appropriate source
8468                                                  * address selection.
8469                                                  */
8470                                         }
8471                                         if (cookie) {
8472                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8473                                                 cookie = 0;
8474                                         }
8475                                         /* Only HB or ASCONF advances time */
8476                                         if (hbflag) {
8477                                                 if (*now_filled == 0) {
8478                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8479                                                         *now_filled = 1;
8480                                                 }
8481                                                 net->last_sent_time = *now;
8482                                                 hbflag = 0;
8483                                         }
8484                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8485                                             (struct sockaddr *)&net->ro._l_addr,
8486                                             outchain,
8487                                             auth_offset, auth,
8488                                             stcb->asoc.authinfo.active_keyid,
8489                                             no_fragmentflg, 0, asconf,
8490                                             inp->sctp_lport, stcb->rport,
8491                                             htonl(stcb->asoc.peer_vtag),
8492                                             net->port, NULL,
8493                                             0, 0,
8494                                             so_locked))) {
8495                                                 /*
8496                                                  * error, we could not
8497                                                  * output
8498                                                  */
8499                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8500                                                 if (from_where == 0) {
8501                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8502                                                 }
8503                                                 if (error == ENOBUFS) {
8504                                                         asoc->ifp_had_enobuf = 1;
8505                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8506                                                 }
8507                                                 if (error == EHOSTUNREACH) {
8508                                                         /*
8509                                                          * Destination went
8510                                                          * unreachable
8511                                                          * during this send
8512                                                          */
8513                                                         sctp_move_chunks_from_net(stcb, net);
8514                                                 }
8515                                                 *reason_code = 7;
8516                                                 break;
8517                                         } else {
8518                                                 asoc->ifp_had_enobuf = 0;
8519                                         }
8520                                         /*
8521                                          * increase the number we sent, if a
8522                                          * cookie is sent we don't tell them
8523                                          * any was sent out.
8524                                          */
8525                                         outchain = endoutchain = NULL;
8526                                         auth = NULL;
8527                                         auth_offset = 0;
8528                                         if (!no_out_cnt)
8529                                                 *num_out += ctl_cnt;
8530                                         /* recalc a clean slate and setup */
8531                                         switch (net->ro._l_addr.sa.sa_family) {
8532 #ifdef INET
8533                                         case AF_INET:
8534                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8535                                                 break;
8536 #endif
8537 #ifdef INET6
8538                                         case AF_INET6:
8539                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8540                                                 break;
8541 #endif
8542                                         default:
8543                                                 /* TSNH */
8544                                                 mtu = net->mtu;
8545                                                 break;
8546                                         }
8547                                         to_out = 0;
8548                                         no_fragmentflg = 1;
8549                                 }
8550                         }
8551                 }
8552                 if (error != 0) {
8553                         /* try next net */
8554                         continue;
8555                 }
8556                 /* JRI: if dest is in PF state, do not send data to it */
8557                 if ((asoc->sctp_cmt_on_off > 0) &&
8558                     (net != stcb->asoc.alternate) &&
8559                     (net->dest_state & SCTP_ADDR_PF)) {
8560                         goto no_data_fill;
8561                 }
8562                 if (net->flight_size >= net->cwnd) {
8563                         goto no_data_fill;
8564                 }
8565                 if ((asoc->sctp_cmt_on_off > 0) &&
8566                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8567                     (net->flight_size > max_rwnd_per_dest)) {
8568                         goto no_data_fill;
8569                 }
8570                 /*
8571                  * We need a specific accounting for the usage of the send
8572                  * buffer. We also need to check the number of messages per
8573                  * net. For now, this is better than nothing and it disabled
8574                  * by default...
8575                  */
8576                 if ((asoc->sctp_cmt_on_off > 0) &&
8577                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8578                     (max_send_per_dest > 0) &&
8579                     (net->flight_size > max_send_per_dest)) {
8580                         goto no_data_fill;
8581                 }
8582                 /*********************/
8583                 /* Data transmission */
8584                 /*********************/
8585                 /*
8586                  * if AUTH for DATA is required and no AUTH has been added
8587                  * yet, account for this in the mtu now... if no data can be
8588                  * bundled, this adjustment won't matter anyways since the
8589                  * packet will be going out...
8590                  */
8591                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8592                     stcb->asoc.peer_auth_chunks);
8593                 if (data_auth_reqd && (auth == NULL)) {
8594                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8595                 }
8596                 /* now lets add any data within the MTU constraints */
8597                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8598 #ifdef INET
8599                 case AF_INET:
8600                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8601                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8602                         else
8603                                 omtu = 0;
8604                         break;
8605 #endif
8606 #ifdef INET6
8607                 case AF_INET6:
8608                         if (net->mtu > SCTP_MIN_OVERHEAD)
8609                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8610                         else
8611                                 omtu = 0;
8612                         break;
8613 #endif
8614                 default:
8615                         /* TSNH */
8616                         omtu = 0;
8617                         break;
8618                 }
8619                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8620                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8621                     (skip_data_for_this_net == 0)) ||
8622                     (cookie)) {
8623                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8624                                 if (no_data_chunks) {
8625                                         /* let only control go out */
8626                                         *reason_code = 1;
8627                                         break;
8628                                 }
8629                                 if (net->flight_size >= net->cwnd) {
8630                                         /* skip this net, no room for data */
8631                                         *reason_code = 2;
8632                                         break;
8633                                 }
8634                                 if ((chk->whoTo != NULL) &&
8635                                     (chk->whoTo != net)) {
8636                                         /* Don't send the chunk on this net */
8637                                         continue;
8638                                 }
8639
8640                                 if (asoc->sctp_cmt_on_off == 0) {
8641                                         if ((asoc->alternate) &&
8642                                             (asoc->alternate != net) &&
8643                                             (chk->whoTo == NULL)) {
8644                                                 continue;
8645                                         } else if ((net != asoc->primary_destination) &&
8646                                                     (asoc->alternate == NULL) &&
8647                                             (chk->whoTo == NULL)) {
8648                                                 continue;
8649                                         }
8650                                 }
8651                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8652                                         /*-
8653                                          * strange, we have a chunk that is
8654                                          * to big for its destination and
8655                                          * yet no fragment ok flag.
8656                                          * Something went wrong when the
8657                                          * PMTU changed...we did not mark
8658                                          * this chunk for some reason?? I
8659                                          * will fix it here by letting IP
8660                                          * fragment it for now and printing
8661                                          * a warning. This really should not
8662                                          * happen ...
8663                                          */
8664                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8665                                             chk->send_size, mtu);
8666                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8667                                 }
8668                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8669                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8670                                         struct sctp_data_chunk *dchkh;
8671
8672                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8673                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8674                                 }
8675                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8676                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8677                                         /* ok we will add this one */
8678
8679                                         /*
8680                                          * Add an AUTH chunk, if chunk
8681                                          * requires it, save the offset into
8682                                          * the chain for AUTH
8683                                          */
8684                                         if (data_auth_reqd) {
8685                                                 if (auth == NULL) {
8686                                                         outchain = sctp_add_auth_chunk(outchain,
8687                                                             &endoutchain,
8688                                                             &auth,
8689                                                             &auth_offset,
8690                                                             stcb,
8691                                                             SCTP_DATA);
8692                                                         auth_keyid = chk->auth_keyid;
8693                                                         override_ok = 0;
8694                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8695                                                 } else if (override_ok) {
8696                                                         /*
8697                                                          * use this data's
8698                                                          * keyid
8699                                                          */
8700                                                         auth_keyid = chk->auth_keyid;
8701                                                         override_ok = 0;
8702                                                 } else if (auth_keyid != chk->auth_keyid) {
8703                                                         /*
8704                                                          * different keyid,
8705                                                          * so done bundling
8706                                                          */
8707                                                         break;
8708                                                 }
8709                                         }
8710                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8711                                             chk->send_size, chk->copy_by_ref);
8712                                         if (outchain == NULL) {
8713                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8714                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8715                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8716                                                 }
8717                                                 *reason_code = 3;
8718                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8719                                                 return (ENOMEM);
8720                                         }
8721                                         /* upate our MTU size */
8722                                         /* Do clear IP_DF ? */
8723                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8724                                                 no_fragmentflg = 0;
8725                                         }
8726                                         /* unsigned subtraction of mtu */
8727                                         if (mtu > chk->send_size)
8728                                                 mtu -= chk->send_size;
8729                                         else
8730                                                 mtu = 0;
8731                                         /* unsigned subtraction of r_mtu */
8732                                         if (r_mtu > chk->send_size)
8733                                                 r_mtu -= chk->send_size;
8734                                         else
8735                                                 r_mtu = 0;
8736
8737                                         to_out += chk->send_size;
8738                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8739 #ifdef INVARIANTS
8740                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8741 #else
8742                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8743                                                     mx_mtu, to_out);
8744 #endif
8745                                         }
8746                                         chk->window_probe = 0;
8747                                         data_list[bundle_at++] = chk;
8748                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8749                                                 break;
8750                                         }
8751                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8752                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8753                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8754                                                 } else {
8755                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8756                                                 }
8757                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8758                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8759                                                         /*
8760                                                          * Count number of
8761                                                          * user msg's that
8762                                                          * were fragmented
8763                                                          * we do this by
8764                                                          * counting when we
8765                                                          * see a LAST
8766                                                          * fragment only.
8767                                                          */
8768                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8769                                         }
8770                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8771                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8772                                                         data_list[0]->window_probe = 1;
8773                                                         net->window_probe = 1;
8774                                                 }
8775                                                 break;
8776                                         }
8777                                 } else {
8778                                         /*
8779                                          * Must be sent in order of the
8780                                          * TSN's (on a network)
8781                                          */
8782                                         break;
8783                                 }
8784                         }       /* for (chunk gather loop for this net) */
8785                 }               /* if asoc.state OPEN */
8786 no_data_fill:
8787                 /* Is there something to send for this destination? */
8788                 if (outchain) {
8789                         /* We may need to start a control timer or two */
8790                         if (asconf) {
8791                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8792                                     stcb, net);
8793                                 /*
8794                                  * do NOT clear the asconf flag as it is
8795                                  * used to do appropriate source address
8796                                  * selection.
8797                                  */
8798                         }
8799                         if (cookie) {
8800                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8801                                 cookie = 0;
8802                         }
8803                         /* must start a send timer if data is being sent */
8804                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8805                                 /*
8806                                  * no timer running on this destination
8807                                  * restart it.
8808                                  */
8809                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8810                         }
8811                         if (bundle_at || hbflag) {
8812                                 /* For data/asconf and hb set time */
8813                                 if (*now_filled == 0) {
8814                                         (void)SCTP_GETTIME_TIMEVAL(now);
8815                                         *now_filled = 1;
8816                                 }
8817                                 net->last_sent_time = *now;
8818                         }
8819                         /* Now send it, if there is anything to send :> */
8820                         if ((error = sctp_lowlevel_chunk_output(inp,
8821                             stcb,
8822                             net,
8823                             (struct sockaddr *)&net->ro._l_addr,
8824                             outchain,
8825                             auth_offset,
8826                             auth,
8827                             auth_keyid,
8828                             no_fragmentflg,
8829                             bundle_at,
8830                             asconf,
8831                             inp->sctp_lport, stcb->rport,
8832                             htonl(stcb->asoc.peer_vtag),
8833                             net->port, NULL,
8834                             0, 0,
8835                             so_locked))) {
8836                                 /* error, we could not output */
8837                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8838                                 if (from_where == 0) {
8839                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8840                                 }
8841                                 if (error == ENOBUFS) {
8842                                         asoc->ifp_had_enobuf = 1;
8843                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8844                                 }
8845                                 if (error == EHOSTUNREACH) {
8846                                         /*
8847                                          * Destination went unreachable
8848                                          * during this send
8849                                          */
8850                                         sctp_move_chunks_from_net(stcb, net);
8851                                 }
8852                                 *reason_code = 6;
8853                                 /*-
8854                                  * I add this line to be paranoid. As far as
8855                                  * I can tell the continue, takes us back to
8856                                  * the top of the for, but just to make sure
8857                                  * I will reset these again here.
8858                                  */
8859                                 ctl_cnt = bundle_at = 0;
8860                                 continue;       /* This takes us back to the
8861                                                  * for() for the nets. */
8862                         } else {
8863                                 asoc->ifp_had_enobuf = 0;
8864                         }
8865                         endoutchain = NULL;
8866                         auth = NULL;
8867                         auth_offset = 0;
8868                         if (!no_out_cnt) {
8869                                 *num_out += (ctl_cnt + bundle_at);
8870                         }
8871                         if (bundle_at) {
8872                                 /* setup for a RTO measurement */
8873                                 tsns_sent = data_list[0]->rec.data.tsn;
8874                                 /* fill time if not already filled */
8875                                 if (*now_filled == 0) {
8876                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8877                                         *now_filled = 1;
8878                                         *now = asoc->time_last_sent;
8879                                 } else {
8880                                         asoc->time_last_sent = *now;
8881                                 }
8882                                 if (net->rto_needed) {
8883                                         data_list[0]->do_rtt = 1;
8884                                         net->rto_needed = 0;
8885                                 }
8886                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8887                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8888                         }
8889                         if (one_chunk) {
8890                                 break;
8891                         }
8892                 }
8893                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8894                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8895                 }
8896         }
8897         if (old_start_at == NULL) {
8898                 old_start_at = start_at;
8899                 start_at = TAILQ_FIRST(&asoc->nets);
8900                 if (old_start_at)
8901                         goto again_one_more_time;
8902         }
8903
8904         /*
8905          * At the end there should be no NON timed chunks hanging on this
8906          * queue.
8907          */
8908         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8909                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8910         }
8911         if ((*num_out == 0) && (*reason_code == 0)) {
8912                 *reason_code = 4;
8913         } else {
8914                 *reason_code = 5;
8915         }
8916         sctp_clean_up_ctl(stcb, asoc, so_locked);
8917         return (0);
8918 }
8919
8920 void
8921 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8922 {
8923         /*-
8924          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8925          * the control chunk queue.
8926          */
8927         struct sctp_chunkhdr *hdr;
8928         struct sctp_tmit_chunk *chk;
8929         struct mbuf *mat, *last_mbuf;
8930         uint32_t chunk_length;
8931         uint16_t padding_length;
8932
8933         SCTP_TCB_LOCK_ASSERT(stcb);
8934         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8935         if (op_err == NULL) {
8936                 return;
8937         }
8938         last_mbuf = NULL;
8939         chunk_length = 0;
8940         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8941                 chunk_length += SCTP_BUF_LEN(mat);
8942                 if (SCTP_BUF_NEXT(mat) == NULL) {
8943                         last_mbuf = mat;
8944                 }
8945         }
8946         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8947                 sctp_m_freem(op_err);
8948                 return;
8949         }
8950         padding_length = chunk_length % 4;
8951         if (padding_length != 0) {
8952                 padding_length = 4 - padding_length;
8953         }
8954         if (padding_length != 0) {
8955                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8956                         sctp_m_freem(op_err);
8957                         return;
8958                 }
8959         }
8960         sctp_alloc_a_chunk(stcb, chk);
8961         if (chk == NULL) {
8962                 /* no memory */
8963                 sctp_m_freem(op_err);
8964                 return;
8965         }
8966         chk->copy_by_ref = 0;
8967         chk->send_size = (uint16_t)chunk_length;
8968         chk->sent = SCTP_DATAGRAM_UNSENT;
8969         chk->snd_count = 0;
8970         chk->asoc = &stcb->asoc;
8971         chk->data = op_err;
8972         chk->whoTo = NULL;
8973         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8974         chk->rec.chunk_id.can_take_data = 0;
8975         hdr = mtod(op_err, struct sctp_chunkhdr *);
8976         hdr->chunk_type = SCTP_OPERATION_ERROR;
8977         hdr->chunk_flags = 0;
8978         hdr->chunk_length = htons(chk->send_size);
8979         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8980         chk->asoc->ctrl_queue_cnt++;
8981 }
8982
8983 int
8984 sctp_send_cookie_echo(struct mbuf *m,
8985     int offset,
8986     struct sctp_tcb *stcb,
8987     struct sctp_nets *net)
8988 {
8989         /*-
8990          * pull out the cookie and put it at the front of the control chunk
8991          * queue.
8992          */
8993         int at;
8994         struct mbuf *cookie;
8995         struct sctp_paramhdr param, *phdr;
8996         struct sctp_chunkhdr *hdr;
8997         struct sctp_tmit_chunk *chk;
8998         uint16_t ptype, plen;
8999
9000         SCTP_TCB_LOCK_ASSERT(stcb);
9001         /* First find the cookie in the param area */
9002         cookie = NULL;
9003         at = offset + sizeof(struct sctp_init_chunk);
9004         for (;;) {
9005                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9006                 if (phdr == NULL) {
9007                         return (-3);
9008                 }
9009                 ptype = ntohs(phdr->param_type);
9010                 plen = ntohs(phdr->param_length);
9011                 if (ptype == SCTP_STATE_COOKIE) {
9012                         int pad;
9013
9014                         /* found the cookie */
9015                         if ((pad = (plen % 4))) {
9016                                 plen += 4 - pad;
9017                         }
9018                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9019                         if (cookie == NULL) {
9020                                 /* No memory */
9021                                 return (-2);
9022                         }
9023 #ifdef SCTP_MBUF_LOGGING
9024                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9025                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9026                         }
9027 #endif
9028                         break;
9029                 }
9030                 at += SCTP_SIZE32(plen);
9031         }
9032         /* ok, we got the cookie lets change it into a cookie echo chunk */
9033         /* first the change from param to cookie */
9034         hdr = mtod(cookie, struct sctp_chunkhdr *);
9035         hdr->chunk_type = SCTP_COOKIE_ECHO;
9036         hdr->chunk_flags = 0;
9037         /* get the chunk stuff now and place it in the FRONT of the queue */
9038         sctp_alloc_a_chunk(stcb, chk);
9039         if (chk == NULL) {
9040                 /* no memory */
9041                 sctp_m_freem(cookie);
9042                 return (-5);
9043         }
9044         chk->copy_by_ref = 0;
9045         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9046         chk->rec.chunk_id.can_take_data = 0;
9047         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9048         chk->send_size = plen;
9049         chk->sent = SCTP_DATAGRAM_UNSENT;
9050         chk->snd_count = 0;
9051         chk->asoc = &stcb->asoc;
9052         chk->data = cookie;
9053         chk->whoTo = net;
9054         atomic_add_int(&chk->whoTo->ref_count, 1);
9055         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9056         chk->asoc->ctrl_queue_cnt++;
9057         return (0);
9058 }
9059
9060 void
9061 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9062     struct mbuf *m,
9063     int offset,
9064     int chk_length,
9065     struct sctp_nets *net)
9066 {
9067         /*
9068          * take a HB request and make it into a HB ack and send it.
9069          */
9070         struct mbuf *outchain;
9071         struct sctp_chunkhdr *chdr;
9072         struct sctp_tmit_chunk *chk;
9073
9074
9075         if (net == NULL)
9076                 /* must have a net pointer */
9077                 return;
9078
9079         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9080         if (outchain == NULL) {
9081                 /* gak out of memory */
9082                 return;
9083         }
9084 #ifdef SCTP_MBUF_LOGGING
9085         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9086                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9087         }
9088 #endif
9089         chdr = mtod(outchain, struct sctp_chunkhdr *);
9090         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9091         chdr->chunk_flags = 0;
9092         if (chk_length % 4) {
9093                 /* need pad */
9094                 uint32_t cpthis = 0;
9095                 int padlen;
9096
9097                 padlen = 4 - (chk_length % 4);
9098                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9099         }
9100         sctp_alloc_a_chunk(stcb, chk);
9101         if (chk == NULL) {
9102                 /* no memory */
9103                 sctp_m_freem(outchain);
9104                 return;
9105         }
9106         chk->copy_by_ref = 0;
9107         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9108         chk->rec.chunk_id.can_take_data = 1;
9109         chk->flags = 0;
9110         chk->send_size = chk_length;
9111         chk->sent = SCTP_DATAGRAM_UNSENT;
9112         chk->snd_count = 0;
9113         chk->asoc = &stcb->asoc;
9114         chk->data = outchain;
9115         chk->whoTo = net;
9116         atomic_add_int(&chk->whoTo->ref_count, 1);
9117         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9118         chk->asoc->ctrl_queue_cnt++;
9119 }
9120
9121 void
9122 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9123 {
9124         /* formulate and queue a cookie-ack back to sender */
9125         struct mbuf *cookie_ack;
9126         struct sctp_chunkhdr *hdr;
9127         struct sctp_tmit_chunk *chk;
9128
9129         SCTP_TCB_LOCK_ASSERT(stcb);
9130
9131         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9132         if (cookie_ack == NULL) {
9133                 /* no mbuf's */
9134                 return;
9135         }
9136         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9137         sctp_alloc_a_chunk(stcb, chk);
9138         if (chk == NULL) {
9139                 /* no memory */
9140                 sctp_m_freem(cookie_ack);
9141                 return;
9142         }
9143         chk->copy_by_ref = 0;
9144         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9145         chk->rec.chunk_id.can_take_data = 1;
9146         chk->flags = 0;
9147         chk->send_size = sizeof(struct sctp_chunkhdr);
9148         chk->sent = SCTP_DATAGRAM_UNSENT;
9149         chk->snd_count = 0;
9150         chk->asoc = &stcb->asoc;
9151         chk->data = cookie_ack;
9152         if (chk->asoc->last_control_chunk_from != NULL) {
9153                 chk->whoTo = chk->asoc->last_control_chunk_from;
9154                 atomic_add_int(&chk->whoTo->ref_count, 1);
9155         } else {
9156                 chk->whoTo = NULL;
9157         }
9158         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9159         hdr->chunk_type = SCTP_COOKIE_ACK;
9160         hdr->chunk_flags = 0;
9161         hdr->chunk_length = htons(chk->send_size);
9162         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9163         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9164         chk->asoc->ctrl_queue_cnt++;
9165         return;
9166 }
9167
9168
9169 void
9170 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9171 {
9172         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9173         struct mbuf *m_shutdown_ack;
9174         struct sctp_shutdown_ack_chunk *ack_cp;
9175         struct sctp_tmit_chunk *chk;
9176
9177         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9178         if (m_shutdown_ack == NULL) {
9179                 /* no mbuf's */
9180                 return;
9181         }
9182         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9183         sctp_alloc_a_chunk(stcb, chk);
9184         if (chk == NULL) {
9185                 /* no memory */
9186                 sctp_m_freem(m_shutdown_ack);
9187                 return;
9188         }
9189         chk->copy_by_ref = 0;
9190         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9191         chk->rec.chunk_id.can_take_data = 1;
9192         chk->flags = 0;
9193         chk->send_size = sizeof(struct sctp_chunkhdr);
9194         chk->sent = SCTP_DATAGRAM_UNSENT;
9195         chk->snd_count = 0;
9196         chk->flags = 0;
9197         chk->asoc = &stcb->asoc;
9198         chk->data = m_shutdown_ack;
9199         chk->whoTo = net;
9200         if (chk->whoTo) {
9201                 atomic_add_int(&chk->whoTo->ref_count, 1);
9202         }
9203         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9204         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9205         ack_cp->ch.chunk_flags = 0;
9206         ack_cp->ch.chunk_length = htons(chk->send_size);
9207         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9208         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9209         chk->asoc->ctrl_queue_cnt++;
9210         return;
9211 }
9212
9213 void
9214 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9215 {
9216         /* formulate and queue a SHUTDOWN to the sender */
9217         struct mbuf *m_shutdown;
9218         struct sctp_shutdown_chunk *shutdown_cp;
9219         struct sctp_tmit_chunk *chk;
9220
9221         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9222                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9223                         /* We already have a SHUTDOWN queued. Reuse it. */
9224                         if (chk->whoTo) {
9225                                 sctp_free_remote_addr(chk->whoTo);
9226                                 chk->whoTo = NULL;
9227                         }
9228                         break;
9229                 }
9230         }
9231         if (chk == NULL) {
9232                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9233                 if (m_shutdown == NULL) {
9234                         /* no mbuf's */
9235                         return;
9236                 }
9237                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9238                 sctp_alloc_a_chunk(stcb, chk);
9239                 if (chk == NULL) {
9240                         /* no memory */
9241                         sctp_m_freem(m_shutdown);
9242                         return;
9243                 }
9244                 chk->copy_by_ref = 0;
9245                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9246                 chk->rec.chunk_id.can_take_data = 1;
9247                 chk->flags = 0;
9248                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9249                 chk->sent = SCTP_DATAGRAM_UNSENT;
9250                 chk->snd_count = 0;
9251                 chk->flags = 0;
9252                 chk->asoc = &stcb->asoc;
9253                 chk->data = m_shutdown;
9254                 chk->whoTo = net;
9255                 if (chk->whoTo) {
9256                         atomic_add_int(&chk->whoTo->ref_count, 1);
9257                 }
9258                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9259                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9260                 shutdown_cp->ch.chunk_flags = 0;
9261                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9262                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9263                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9264                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9265                 chk->asoc->ctrl_queue_cnt++;
9266         } else {
9267                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9268                 chk->whoTo = net;
9269                 if (chk->whoTo) {
9270                         atomic_add_int(&chk->whoTo->ref_count, 1);
9271                 }
9272                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9273                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9274                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9275         }
9276         return;
9277 }
9278
9279 void
9280 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9281 {
9282         /*
9283          * formulate and queue an ASCONF to the peer. ASCONF parameters
9284          * should be queued on the assoc queue.
9285          */
9286         struct sctp_tmit_chunk *chk;
9287         struct mbuf *m_asconf;
9288         int len;
9289
9290         SCTP_TCB_LOCK_ASSERT(stcb);
9291
9292         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9293             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9294                 /* can't send a new one if there is one in flight already */
9295                 return;
9296         }
9297
9298         /* compose an ASCONF chunk, maximum length is PMTU */
9299         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9300         if (m_asconf == NULL) {
9301                 return;
9302         }
9303
9304         sctp_alloc_a_chunk(stcb, chk);
9305         if (chk == NULL) {
9306                 /* no memory */
9307                 sctp_m_freem(m_asconf);
9308                 return;
9309         }
9310
9311         chk->copy_by_ref = 0;
9312         chk->rec.chunk_id.id = SCTP_ASCONF;
9313         chk->rec.chunk_id.can_take_data = 0;
9314         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9315         chk->data = m_asconf;
9316         chk->send_size = len;
9317         chk->sent = SCTP_DATAGRAM_UNSENT;
9318         chk->snd_count = 0;
9319         chk->asoc = &stcb->asoc;
9320         chk->whoTo = net;
9321         if (chk->whoTo) {
9322                 atomic_add_int(&chk->whoTo->ref_count, 1);
9323         }
9324         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9325         chk->asoc->ctrl_queue_cnt++;
9326         return;
9327 }
9328
9329 void
9330 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9331 {
9332         /*
9333          * formulate and queue a asconf-ack back to sender. the asconf-ack
9334          * must be stored in the tcb.
9335          */
9336         struct sctp_tmit_chunk *chk;
9337         struct sctp_asconf_ack *ack, *latest_ack;
9338         struct mbuf *m_ack;
9339         struct sctp_nets *net = NULL;
9340
9341         SCTP_TCB_LOCK_ASSERT(stcb);
9342         /* Get the latest ASCONF-ACK */
9343         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9344         if (latest_ack == NULL) {
9345                 return;
9346         }
9347         if (latest_ack->last_sent_to != NULL &&
9348             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9349                 /* we're doing a retransmission */
9350                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9351                 if (net == NULL) {
9352                         /* no alternate */
9353                         if (stcb->asoc.last_control_chunk_from == NULL) {
9354                                 if (stcb->asoc.alternate) {
9355                                         net = stcb->asoc.alternate;
9356                                 } else {
9357                                         net = stcb->asoc.primary_destination;
9358                                 }
9359                         } else {
9360                                 net = stcb->asoc.last_control_chunk_from;
9361                         }
9362                 }
9363         } else {
9364                 /* normal case */
9365                 if (stcb->asoc.last_control_chunk_from == NULL) {
9366                         if (stcb->asoc.alternate) {
9367                                 net = stcb->asoc.alternate;
9368                         } else {
9369                                 net = stcb->asoc.primary_destination;
9370                         }
9371                 } else {
9372                         net = stcb->asoc.last_control_chunk_from;
9373                 }
9374         }
9375         latest_ack->last_sent_to = net;
9376
9377         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9378                 if (ack->data == NULL) {
9379                         continue;
9380                 }
9381
9382                 /* copy the asconf_ack */
9383                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9384                 if (m_ack == NULL) {
9385                         /* couldn't copy it */
9386                         return;
9387                 }
9388 #ifdef SCTP_MBUF_LOGGING
9389                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9390                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9391                 }
9392 #endif
9393
9394                 sctp_alloc_a_chunk(stcb, chk);
9395                 if (chk == NULL) {
9396                         /* no memory */
9397                         if (m_ack)
9398                                 sctp_m_freem(m_ack);
9399                         return;
9400                 }
9401                 chk->copy_by_ref = 0;
9402                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9403                 chk->rec.chunk_id.can_take_data = 1;
9404                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9405                 chk->whoTo = net;
9406                 if (chk->whoTo) {
9407                         atomic_add_int(&chk->whoTo->ref_count, 1);
9408                 }
9409                 chk->data = m_ack;
9410                 chk->send_size = ack->len;
9411                 chk->sent = SCTP_DATAGRAM_UNSENT;
9412                 chk->snd_count = 0;
9413                 chk->asoc = &stcb->asoc;
9414
9415                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9416                 chk->asoc->ctrl_queue_cnt++;
9417         }
9418         return;
9419 }
9420
9421
9422 static int
9423 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9424     struct sctp_tcb *stcb,
9425     struct sctp_association *asoc,
9426     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9427 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9428     SCTP_UNUSED
9429 #endif
9430 )
9431 {
9432         /*-
9433          * send out one MTU of retransmission. If fast_retransmit is
9434          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9435          * rwnd. For a Cookie or Asconf in the control chunk queue we
9436          * retransmit them by themselves.
9437          *
9438          * For data chunks we will pick out the lowest TSN's in the sent_queue
9439          * marked for resend and bundle them all together (up to a MTU of
9440          * destination). The address to send to should have been
9441          * selected/changed where the retransmission was marked (i.e. in FR
9442          * or t3-timeout routines).
9443          */
9444         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9445         struct sctp_tmit_chunk *chk, *fwd;
9446         struct mbuf *m, *endofchain;
9447         struct sctp_nets *net = NULL;
9448         uint32_t tsns_sent = 0;
9449         int no_fragmentflg, bundle_at, cnt_thru;
9450         unsigned int mtu;
9451         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9452         struct sctp_auth_chunk *auth = NULL;
9453         uint32_t auth_offset = 0;
9454         uint16_t auth_keyid;
9455         int override_ok = 1;
9456         int data_auth_reqd = 0;
9457         uint32_t dmtu = 0;
9458
9459         SCTP_TCB_LOCK_ASSERT(stcb);
9460         tmr_started = ctl_cnt = bundle_at = error = 0;
9461         no_fragmentflg = 1;
9462         fwd_tsn = 0;
9463         *cnt_out = 0;
9464         fwd = NULL;
9465         endofchain = m = NULL;
9466         auth_keyid = stcb->asoc.authinfo.active_keyid;
9467 #ifdef SCTP_AUDITING_ENABLED
9468         sctp_audit_log(0xC3, 1);
9469 #endif
9470         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9471             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9472                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9473                     asoc->sent_queue_retran_cnt);
9474                 asoc->sent_queue_cnt = 0;
9475                 asoc->sent_queue_cnt_removeable = 0;
9476                 /* send back 0/0 so we enter normal transmission */
9477                 *cnt_out = 0;
9478                 return (0);
9479         }
9480         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9481                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9482                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9483                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9484                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9485                                 continue;
9486                         }
9487                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9488                                 if (chk != asoc->str_reset) {
9489                                         /*
9490                                          * not eligible for retran if its
9491                                          * not ours
9492                                          */
9493                                         continue;
9494                                 }
9495                         }
9496                         ctl_cnt++;
9497                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9498                                 fwd_tsn = 1;
9499                         }
9500                         /*
9501                          * Add an AUTH chunk, if chunk requires it save the
9502                          * offset into the chain for AUTH
9503                          */
9504                         if ((auth == NULL) &&
9505                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9506                             stcb->asoc.peer_auth_chunks))) {
9507                                 m = sctp_add_auth_chunk(m, &endofchain,
9508                                     &auth, &auth_offset,
9509                                     stcb,
9510                                     chk->rec.chunk_id.id);
9511                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9512                         }
9513                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9514                         break;
9515                 }
9516         }
9517         one_chunk = 0;
9518         cnt_thru = 0;
9519         /* do we have control chunks to retransmit? */
9520         if (m != NULL) {
9521                 /* Start a timer no matter if we succeed or fail */
9522                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9523                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9524                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9525                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9526                 chk->snd_count++;       /* update our count */
9527                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9528                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9529                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9530                     no_fragmentflg, 0, 0,
9531                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9532                     chk->whoTo->port, NULL,
9533                     0, 0,
9534                     so_locked))) {
9535                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9536                         if (error == ENOBUFS) {
9537                                 asoc->ifp_had_enobuf = 1;
9538                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9539                         }
9540                         return (error);
9541                 } else {
9542                         asoc->ifp_had_enobuf = 0;
9543                 }
9544                 endofchain = NULL;
9545                 auth = NULL;
9546                 auth_offset = 0;
9547                 /*
9548                  * We don't want to mark the net->sent time here since this
9549                  * we use this for HB and retrans cannot measure RTT
9550                  */
9551                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9552                 *cnt_out += 1;
9553                 chk->sent = SCTP_DATAGRAM_SENT;
9554                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9555                 if (fwd_tsn == 0) {
9556                         return (0);
9557                 } else {
9558                         /* Clean up the fwd-tsn list */
9559                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9560                         return (0);
9561                 }
9562         }
9563         /*
9564          * Ok, it is just data retransmission we need to do or that and a
9565          * fwd-tsn with it all.
9566          */
9567         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9568                 return (SCTP_RETRAN_DONE);
9569         }
9570         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9571             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9572                 /* not yet open, resend the cookie and that is it */
9573                 return (1);
9574         }
9575 #ifdef SCTP_AUDITING_ENABLED
9576         sctp_auditing(20, inp, stcb, NULL);
9577 #endif
9578         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9579         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9580                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9581                         /* No, not sent to this net or not ready for rtx */
9582                         continue;
9583                 }
9584                 if (chk->data == NULL) {
9585                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9586                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9587                         continue;
9588                 }
9589                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9590                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9591                         struct mbuf *op_err;
9592                         char msg[SCTP_DIAG_INFO_LEN];
9593
9594                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9595                             chk->rec.data.tsn, chk->snd_count);
9596                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9597                             msg);
9598                         atomic_add_int(&stcb->asoc.refcnt, 1);
9599                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9600                             so_locked);
9601                         SCTP_TCB_LOCK(stcb);
9602                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9603                         return (SCTP_RETRAN_EXIT);
9604                 }
9605                 /* pick up the net */
9606                 net = chk->whoTo;
9607                 switch (net->ro._l_addr.sa.sa_family) {
9608 #ifdef INET
9609                 case AF_INET:
9610                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9611                         break;
9612 #endif
9613 #ifdef INET6
9614                 case AF_INET6:
9615                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9616                         break;
9617 #endif
9618                 default:
9619                         /* TSNH */
9620                         mtu = net->mtu;
9621                         break;
9622                 }
9623
9624                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9625                         /* No room in peers rwnd */
9626                         uint32_t tsn;
9627
9628                         tsn = asoc->last_acked_seq + 1;
9629                         if (tsn == chk->rec.data.tsn) {
9630                                 /*
9631                                  * we make a special exception for this
9632                                  * case. The peer has no rwnd but is missing
9633                                  * the lowest chunk.. which is probably what
9634                                  * is holding up the rwnd.
9635                                  */
9636                                 goto one_chunk_around;
9637                         }
9638                         return (1);
9639                 }
9640 one_chunk_around:
9641                 if (asoc->peers_rwnd < mtu) {
9642                         one_chunk = 1;
9643                         if ((asoc->peers_rwnd == 0) &&
9644                             (asoc->total_flight == 0)) {
9645                                 chk->window_probe = 1;
9646                                 chk->whoTo->window_probe = 1;
9647                         }
9648                 }
9649 #ifdef SCTP_AUDITING_ENABLED
9650                 sctp_audit_log(0xC3, 2);
9651 #endif
9652                 bundle_at = 0;
9653                 m = NULL;
9654                 net->fast_retran_ip = 0;
9655                 if (chk->rec.data.doing_fast_retransmit == 0) {
9656                         /*
9657                          * if no FR in progress skip destination that have
9658                          * flight_size > cwnd.
9659                          */
9660                         if (net->flight_size >= net->cwnd) {
9661                                 continue;
9662                         }
9663                 } else {
9664                         /*
9665                          * Mark the destination net to have FR recovery
9666                          * limits put on it.
9667                          */
9668                         *fr_done = 1;
9669                         net->fast_retran_ip = 1;
9670                 }
9671
9672                 /*
9673                  * if no AUTH is yet included and this chunk requires it,
9674                  * make sure to account for it.  We don't apply the size
9675                  * until the AUTH chunk is actually added below in case
9676                  * there is no room for this chunk.
9677                  */
9678                 if (data_auth_reqd && (auth == NULL)) {
9679                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9680                 } else
9681                         dmtu = 0;
9682
9683                 if ((chk->send_size <= (mtu - dmtu)) ||
9684                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9685                         /* ok we will add this one */
9686                         if (data_auth_reqd) {
9687                                 if (auth == NULL) {
9688                                         m = sctp_add_auth_chunk(m,
9689                                             &endofchain,
9690                                             &auth,
9691                                             &auth_offset,
9692                                             stcb,
9693                                             SCTP_DATA);
9694                                         auth_keyid = chk->auth_keyid;
9695                                         override_ok = 0;
9696                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9697                                 } else if (override_ok) {
9698                                         auth_keyid = chk->auth_keyid;
9699                                         override_ok = 0;
9700                                 } else if (chk->auth_keyid != auth_keyid) {
9701                                         /* different keyid, so done bundling */
9702                                         break;
9703                                 }
9704                         }
9705                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9706                         if (m == NULL) {
9707                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9708                                 return (ENOMEM);
9709                         }
9710                         /* Do clear IP_DF ? */
9711                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9712                                 no_fragmentflg = 0;
9713                         }
9714                         /* upate our MTU size */
9715                         if (mtu > (chk->send_size + dmtu))
9716                                 mtu -= (chk->send_size + dmtu);
9717                         else
9718                                 mtu = 0;
9719                         data_list[bundle_at++] = chk;
9720                         if (one_chunk && (asoc->total_flight <= 0)) {
9721                                 SCTP_STAT_INCR(sctps_windowprobed);
9722                         }
9723                 }
9724                 if (one_chunk == 0) {
9725                         /*
9726                          * now are there anymore forward from chk to pick
9727                          * up?
9728                          */
9729                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9730                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9731                                         /* Nope, not for retran */
9732                                         continue;
9733                                 }
9734                                 if (fwd->whoTo != net) {
9735                                         /* Nope, not the net in question */
9736                                         continue;
9737                                 }
9738                                 if (data_auth_reqd && (auth == NULL)) {
9739                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9740                                 } else
9741                                         dmtu = 0;
9742                                 if (fwd->send_size <= (mtu - dmtu)) {
9743                                         if (data_auth_reqd) {
9744                                                 if (auth == NULL) {
9745                                                         m = sctp_add_auth_chunk(m,
9746                                                             &endofchain,
9747                                                             &auth,
9748                                                             &auth_offset,
9749                                                             stcb,
9750                                                             SCTP_DATA);
9751                                                         auth_keyid = fwd->auth_keyid;
9752                                                         override_ok = 0;
9753                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9754                                                 } else if (override_ok) {
9755                                                         auth_keyid = fwd->auth_keyid;
9756                                                         override_ok = 0;
9757                                                 } else if (fwd->auth_keyid != auth_keyid) {
9758                                                         /*
9759                                                          * different keyid,
9760                                                          * so done bundling
9761                                                          */
9762                                                         break;
9763                                                 }
9764                                         }
9765                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9766                                         if (m == NULL) {
9767                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9768                                                 return (ENOMEM);
9769                                         }
9770                                         /* Do clear IP_DF ? */
9771                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9772                                                 no_fragmentflg = 0;
9773                                         }
9774                                         /* upate our MTU size */
9775                                         if (mtu > (fwd->send_size + dmtu))
9776                                                 mtu -= (fwd->send_size + dmtu);
9777                                         else
9778                                                 mtu = 0;
9779                                         data_list[bundle_at++] = fwd;
9780                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9781                                                 break;
9782                                         }
9783                                 } else {
9784                                         /* can't fit so we are done */
9785                                         break;
9786                                 }
9787                         }
9788                 }
9789                 /* Is there something to send for this destination? */
9790                 if (m) {
9791                         /*
9792                          * No matter if we fail/or succeed we should start a
9793                          * timer. A failure is like a lost IP packet :-)
9794                          */
9795                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9796                                 /*
9797                                  * no timer running on this destination
9798                                  * restart it.
9799                                  */
9800                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9801                                 tmr_started = 1;
9802                         }
9803                         /* Now lets send it, if there is anything to send :> */
9804                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9805                             (struct sockaddr *)&net->ro._l_addr, m,
9806                             auth_offset, auth, auth_keyid,
9807                             no_fragmentflg, 0, 0,
9808                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9809                             net->port, NULL,
9810                             0, 0,
9811                             so_locked))) {
9812                                 /* error, we could not output */
9813                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9814                                 if (error == ENOBUFS) {
9815                                         asoc->ifp_had_enobuf = 1;
9816                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9817                                 }
9818                                 return (error);
9819                         } else {
9820                                 asoc->ifp_had_enobuf = 0;
9821                         }
9822                         endofchain = NULL;
9823                         auth = NULL;
9824                         auth_offset = 0;
9825                         /* For HB's */
9826                         /*
9827                          * We don't want to mark the net->sent time here
9828                          * since this we use this for HB and retrans cannot
9829                          * measure RTT
9830                          */
9831                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9832
9833                         /* For auto-close */
9834                         cnt_thru++;
9835                         if (*now_filled == 0) {
9836                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9837                                 *now = asoc->time_last_sent;
9838                                 *now_filled = 1;
9839                         } else {
9840                                 asoc->time_last_sent = *now;
9841                         }
9842                         *cnt_out += bundle_at;
9843 #ifdef SCTP_AUDITING_ENABLED
9844                         sctp_audit_log(0xC4, bundle_at);
9845 #endif
9846                         if (bundle_at) {
9847                                 tsns_sent = data_list[0]->rec.data.tsn;
9848                         }
9849                         for (i = 0; i < bundle_at; i++) {
9850                                 SCTP_STAT_INCR(sctps_sendretransdata);
9851                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9852                                 /*
9853                                  * When we have a revoked data, and we
9854                                  * retransmit it, then we clear the revoked
9855                                  * flag since this flag dictates if we
9856                                  * subtracted from the fs
9857                                  */
9858                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9859                                         /* Deflate the cwnd */
9860                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9861                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9862                                 }
9863                                 data_list[i]->snd_count++;
9864                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9865                                 /* record the time */
9866                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9867                                 if (data_list[i]->book_size_scale) {
9868                                         /*
9869                                          * need to double the book size on
9870                                          * this one
9871                                          */
9872                                         data_list[i]->book_size_scale = 0;
9873                                         /*
9874                                          * Since we double the booksize, we
9875                                          * must also double the output queue
9876                                          * size, since this get shrunk when
9877                                          * we free by this amount.
9878                                          */
9879                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9880                                         data_list[i]->book_size *= 2;
9881
9882
9883                                 } else {
9884                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9885                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9886                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9887                                         }
9888                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9889                                             (uint32_t)(data_list[i]->send_size +
9890                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9891                                 }
9892                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9893                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9894                                             data_list[i]->whoTo->flight_size,
9895                                             data_list[i]->book_size,
9896                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9897                                             data_list[i]->rec.data.tsn);
9898                                 }
9899                                 sctp_flight_size_increase(data_list[i]);
9900                                 sctp_total_flight_increase(stcb, data_list[i]);
9901                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9902                                         /* SWS sender side engages */
9903                                         asoc->peers_rwnd = 0;
9904                                 }
9905                                 if ((i == 0) &&
9906                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9907                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9908                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9909                                             (tmr_started == 0)) {
9910                                                 /*-
9911                                                  * ok we just fast-retrans'd
9912                                                  * the lowest TSN, i.e the
9913                                                  * first on the list. In
9914                                                  * this case we want to give
9915                                                  * some more time to get a
9916                                                  * SACK back without a
9917                                                  * t3-expiring.
9918                                                  */
9919                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9920                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9921                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9922                                         }
9923                                 }
9924                         }
9925                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9926                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9927                         }
9928 #ifdef SCTP_AUDITING_ENABLED
9929                         sctp_auditing(21, inp, stcb, NULL);
9930 #endif
9931                 } else {
9932                         /* None will fit */
9933                         return (1);
9934                 }
9935                 if (asoc->sent_queue_retran_cnt <= 0) {
9936                         /* all done we have no more to retran */
9937                         asoc->sent_queue_retran_cnt = 0;
9938                         break;
9939                 }
9940                 if (one_chunk) {
9941                         /* No more room in rwnd */
9942                         return (1);
9943                 }
9944                 /* stop the for loop here. we sent out a packet */
9945                 break;
9946         }
9947         return (0);
9948 }
9949
9950 static void
9951 sctp_timer_validation(struct sctp_inpcb *inp,
9952     struct sctp_tcb *stcb,
9953     struct sctp_association *asoc)
9954 {
9955         struct sctp_nets *net;
9956
9957         /* Validate that a timer is running somewhere */
9958         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9959                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9960                         /* Here is a timer */
9961                         return;
9962                 }
9963         }
9964         SCTP_TCB_LOCK_ASSERT(stcb);
9965         /* Gak, we did not have a timer somewhere */
9966         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9967         if (asoc->alternate) {
9968                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9969         } else {
9970                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9971         }
9972         return;
9973 }
9974
9975 void
9976 sctp_chunk_output(struct sctp_inpcb *inp,
9977     struct sctp_tcb *stcb,
9978     int from_where,
9979     int so_locked
9980 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9981     SCTP_UNUSED
9982 #endif
9983 )
9984 {
9985         /*-
9986          * Ok this is the generic chunk service queue. we must do the
9987          * following:
9988          * - See if there are retransmits pending, if so we must
9989          *   do these first.
9990          * - Service the stream queue that is next, moving any
9991          *   message (note I must get a complete message i.e.
9992          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9993          *   TSN's
9994          * - Check to see if the cwnd/rwnd allows any output, if so we
9995          *   go ahead and fomulate and send the low level chunks. Making sure
9996          *   to combine any control in the control chunk queue also.
9997          */
9998         struct sctp_association *asoc;
9999         struct sctp_nets *net;
10000         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10001         unsigned int burst_cnt = 0;
10002         struct timeval now;
10003         int now_filled = 0;
10004         int nagle_on;
10005         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10006         int un_sent = 0;
10007         int fr_done;
10008         unsigned int tot_frs = 0;
10009
10010         asoc = &stcb->asoc;
10011 do_it_again:
10012         /* The Nagle algorithm is only applied when handling a send call. */
10013         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10014                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10015                         nagle_on = 0;
10016                 } else {
10017                         nagle_on = 1;
10018                 }
10019         } else {
10020                 nagle_on = 0;
10021         }
10022         SCTP_TCB_LOCK_ASSERT(stcb);
10023
10024         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10025
10026         if ((un_sent <= 0) &&
10027             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10028             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10029             (asoc->sent_queue_retran_cnt == 0) &&
10030             (asoc->trigger_reset == 0)) {
10031                 /* Nothing to do unless there is something to be sent left */
10032                 return;
10033         }
10034         /*
10035          * Do we have something to send, data or control AND a sack timer
10036          * running, if so piggy-back the sack.
10037          */
10038         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10039                 sctp_send_sack(stcb, so_locked);
10040                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10041         }
10042         while (asoc->sent_queue_retran_cnt) {
10043                 /*-
10044                  * Ok, it is retransmission time only, we send out only ONE
10045                  * packet with a single call off to the retran code.
10046                  */
10047                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10048                         /*-
10049                          * Special hook for handling cookiess discarded
10050                          * by peer that carried data. Send cookie-ack only
10051                          * and then the next call with get the retran's.
10052                          */
10053                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10054                             from_where,
10055                             &now, &now_filled, frag_point, so_locked);
10056                         return;
10057                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10058                         /* if its not from a HB then do it */
10059                         fr_done = 0;
10060                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10061                         if (fr_done) {
10062                                 tot_frs++;
10063                         }
10064                 } else {
10065                         /*
10066                          * its from any other place, we don't allow retran
10067                          * output (only control)
10068                          */
10069                         ret = 1;
10070                 }
10071                 if (ret > 0) {
10072                         /* Can't send anymore */
10073                         /*-
10074                          * now lets push out control by calling med-level
10075                          * output once. this assures that we WILL send HB's
10076                          * if queued too.
10077                          */
10078                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10079                             from_where,
10080                             &now, &now_filled, frag_point, so_locked);
10081 #ifdef SCTP_AUDITING_ENABLED
10082                         sctp_auditing(8, inp, stcb, NULL);
10083 #endif
10084                         sctp_timer_validation(inp, stcb, asoc);
10085                         return;
10086                 }
10087                 if (ret < 0) {
10088                         /*-
10089                          * The count was off.. retran is not happening so do
10090                          * the normal retransmission.
10091                          */
10092 #ifdef SCTP_AUDITING_ENABLED
10093                         sctp_auditing(9, inp, stcb, NULL);
10094 #endif
10095                         if (ret == SCTP_RETRAN_EXIT) {
10096                                 return;
10097                         }
10098                         break;
10099                 }
10100                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10101                         /* Only one transmission allowed out of a timeout */
10102 #ifdef SCTP_AUDITING_ENABLED
10103                         sctp_auditing(10, inp, stcb, NULL);
10104 #endif
10105                         /* Push out any control */
10106                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10107                             &now, &now_filled, frag_point, so_locked);
10108                         return;
10109                 }
10110                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10111                         /* Hit FR burst limit */
10112                         return;
10113                 }
10114                 if ((num_out == 0) && (ret == 0)) {
10115                         /* No more retrans to send */
10116                         break;
10117                 }
10118         }
10119 #ifdef SCTP_AUDITING_ENABLED
10120         sctp_auditing(12, inp, stcb, NULL);
10121 #endif
10122         /* Check for bad destinations, if they exist move chunks around. */
10123         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10124                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10125                         /*-
10126                          * if possible move things off of this address we
10127                          * still may send below due to the dormant state but
10128                          * we try to find an alternate address to send to
10129                          * and if we have one we move all queued data on the
10130                          * out wheel to this alternate address.
10131                          */
10132                         if (net->ref_count > 1)
10133                                 sctp_move_chunks_from_net(stcb, net);
10134                 } else {
10135                         /*-
10136                          * if ((asoc->sat_network) || (net->addr_is_local))
10137                          * { burst_limit = asoc->max_burst *
10138                          * SCTP_SAT_NETWORK_BURST_INCR; }
10139                          */
10140                         if (asoc->max_burst > 0) {
10141                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10142                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10143                                                 /*
10144                                                  * JRS - Use the congestion
10145                                                  * control given in the
10146                                                  * congestion control module
10147                                                  */
10148                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10149                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10150                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10151                                                 }
10152                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10153                                         }
10154                                         net->fast_retran_ip = 0;
10155                                 } else {
10156                                         if (net->flight_size == 0) {
10157                                                 /*
10158                                                  * Should be decaying the
10159                                                  * cwnd here
10160                                                  */
10161                                                 ;
10162                                         }
10163                                 }
10164                         }
10165                 }
10166
10167         }
10168         burst_cnt = 0;
10169         do {
10170                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10171                     &reason_code, 0, from_where,
10172                     &now, &now_filled, frag_point, so_locked);
10173                 if (error) {
10174                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10175                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10176                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10177                         }
10178                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10179                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10180                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10181                         }
10182                         break;
10183                 }
10184                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10185
10186                 tot_out += num_out;
10187                 burst_cnt++;
10188                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10189                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10190                         if (num_out == 0) {
10191                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10192                         }
10193                 }
10194                 if (nagle_on) {
10195                         /*
10196                          * When the Nagle algorithm is used, look at how
10197                          * much is unsent, then if its smaller than an MTU
10198                          * and we have data in flight we stop, except if we
10199                          * are handling a fragmented user message.
10200                          */
10201                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10202                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10203                             (stcb->asoc.total_flight > 0)) {
10204 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10205                                 break;
10206                         }
10207                 }
10208                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10209                     TAILQ_EMPTY(&asoc->send_queue) &&
10210                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10211                         /* Nothing left to send */
10212                         break;
10213                 }
10214                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10215                         /* Nothing left to send */
10216                         break;
10217                 }
10218         } while (num_out &&
10219             ((asoc->max_burst == 0) ||
10220             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10221             (burst_cnt < asoc->max_burst)));
10222
10223         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10224                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10225                         SCTP_STAT_INCR(sctps_maxburstqueued);
10226                         asoc->burst_limit_applied = 1;
10227                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10228                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10229                         }
10230                 } else {
10231                         asoc->burst_limit_applied = 0;
10232                 }
10233         }
10234         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10235                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10236         }
10237         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10238             tot_out);
10239
10240         /*-
10241          * Now we need to clean up the control chunk chain if a ECNE is on
10242          * it. It must be marked as UNSENT again so next call will continue
10243          * to send it until such time that we get a CWR, to remove it.
10244          */
10245         if (stcb->asoc.ecn_echo_cnt_onq)
10246                 sctp_fix_ecn_echo(asoc);
10247
10248         if (stcb->asoc.trigger_reset) {
10249                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10250                         goto do_it_again;
10251                 }
10252         }
10253         return;
10254 }
10255
10256
10257 int
10258 sctp_output(
10259     struct sctp_inpcb *inp,
10260     struct mbuf *m,
10261     struct sockaddr *addr,
10262     struct mbuf *control,
10263     struct thread *p,
10264     int flags)
10265 {
10266         if (inp == NULL) {
10267                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10268                 return (EINVAL);
10269         }
10270
10271         if (inp->sctp_socket == NULL) {
10272                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10273                 return (EINVAL);
10274         }
10275         return (sctp_sosend(inp->sctp_socket,
10276             addr,
10277             (struct uio *)NULL,
10278             m,
10279             control,
10280             flags, p
10281             ));
10282 }
10283
10284 void
10285 send_forward_tsn(struct sctp_tcb *stcb,
10286     struct sctp_association *asoc)
10287 {
10288         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10289         struct sctp_forward_tsn_chunk *fwdtsn;
10290         struct sctp_strseq *strseq;
10291         struct sctp_strseq_mid *strseq_m;
10292         uint32_t advance_peer_ack_point;
10293         unsigned int cnt_of_space, i, ovh;
10294         unsigned int space_needed;
10295         unsigned int cnt_of_skipped = 0;
10296
10297         SCTP_TCB_LOCK_ASSERT(stcb);
10298         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10299                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10300                         /* mark it to unsent */
10301                         chk->sent = SCTP_DATAGRAM_UNSENT;
10302                         chk->snd_count = 0;
10303                         /* Do we correct its output location? */
10304                         if (chk->whoTo) {
10305                                 sctp_free_remote_addr(chk->whoTo);
10306                                 chk->whoTo = NULL;
10307                         }
10308                         goto sctp_fill_in_rest;
10309                 }
10310         }
10311         /* Ok if we reach here we must build one */
10312         sctp_alloc_a_chunk(stcb, chk);
10313         if (chk == NULL) {
10314                 return;
10315         }
10316         asoc->fwd_tsn_cnt++;
10317         chk->copy_by_ref = 0;
10318         /*
10319          * We don't do the old thing here since this is used not for on-wire
10320          * but to tell if we are sending a fwd-tsn by the stack during
10321          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10322          */
10323         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10324         chk->rec.chunk_id.can_take_data = 0;
10325         chk->flags = 0;
10326         chk->asoc = asoc;
10327         chk->whoTo = NULL;
10328         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10329         if (chk->data == NULL) {
10330                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10331                 return;
10332         }
10333         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10334         chk->sent = SCTP_DATAGRAM_UNSENT;
10335         chk->snd_count = 0;
10336         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10337         asoc->ctrl_queue_cnt++;
10338 sctp_fill_in_rest:
10339         /*-
10340          * Here we go through and fill out the part that deals with
10341          * stream/seq of the ones we skip.
10342          */
10343         SCTP_BUF_LEN(chk->data) = 0;
10344         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10345                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10346                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10347                         /* no more to look at */
10348                         break;
10349                 }
10350                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10351                         /* We don't report these */
10352                         continue;
10353                 }
10354                 cnt_of_skipped++;
10355         }
10356         if (asoc->idata_supported) {
10357                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10358                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10359         } else {
10360                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10361                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10362         }
10363         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10364
10365         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10366                 ovh = SCTP_MIN_OVERHEAD;
10367         } else {
10368                 ovh = SCTP_MIN_V4_OVERHEAD;
10369         }
10370         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10371                 /* trim to a mtu size */
10372                 cnt_of_space = asoc->smallest_mtu - ovh;
10373         }
10374         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10375                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10376                     0xff, 0, cnt_of_skipped,
10377                     asoc->advanced_peer_ack_point);
10378         }
10379         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10380         if (cnt_of_space < space_needed) {
10381                 /*-
10382                  * ok we must trim down the chunk by lowering the
10383                  * advance peer ack point.
10384                  */
10385                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10386                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10387                             0xff, 0xff, cnt_of_space,
10388                             space_needed);
10389                 }
10390                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10391                 if (asoc->idata_supported) {
10392                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10393                 } else {
10394                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10395                 }
10396                 /*-
10397                  * Go through and find the TSN that will be the one
10398                  * we report.
10399                  */
10400                 at = TAILQ_FIRST(&asoc->sent_queue);
10401                 if (at != NULL) {
10402                         for (i = 0; i < cnt_of_skipped; i++) {
10403                                 tp1 = TAILQ_NEXT(at, sctp_next);
10404                                 if (tp1 == NULL) {
10405                                         break;
10406                                 }
10407                                 at = tp1;
10408                         }
10409                 }
10410                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10411                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10412                             0xff, cnt_of_skipped, at->rec.data.tsn,
10413                             asoc->advanced_peer_ack_point);
10414                 }
10415                 last = at;
10416                 /*-
10417                  * last now points to last one I can report, update
10418                  * peer ack point
10419                  */
10420                 if (last) {
10421                         advance_peer_ack_point = last->rec.data.tsn;
10422                 }
10423                 if (asoc->idata_supported) {
10424                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10425                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10426                 } else {
10427                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10428                             cnt_of_skipped * sizeof(struct sctp_strseq);
10429                 }
10430         }
10431         chk->send_size = space_needed;
10432         /* Setup the chunk */
10433         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10434         fwdtsn->ch.chunk_length = htons(chk->send_size);
10435         fwdtsn->ch.chunk_flags = 0;
10436         if (asoc->idata_supported) {
10437                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10438         } else {
10439                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10440         }
10441         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10442         SCTP_BUF_LEN(chk->data) = chk->send_size;
10443         fwdtsn++;
10444         /*-
10445          * Move pointer to after the fwdtsn and transfer to the
10446          * strseq pointer.
10447          */
10448         if (asoc->idata_supported) {
10449                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10450                 strseq = NULL;
10451         } else {
10452                 strseq = (struct sctp_strseq *)fwdtsn;
10453                 strseq_m = NULL;
10454         }
10455         /*-
10456          * Now populate the strseq list. This is done blindly
10457          * without pulling out duplicate stream info. This is
10458          * inefficent but won't harm the process since the peer will
10459          * look at these in sequence and will thus release anything.
10460          * It could mean we exceed the PMTU and chop off some that
10461          * we could have included.. but this is unlikely (aka 1432/4
10462          * would mean 300+ stream seq's would have to be reported in
10463          * one FWD-TSN. With a bit of work we can later FIX this to
10464          * optimize and pull out duplicates.. but it does add more
10465          * overhead. So for now... not!
10466          */
10467         i = 0;
10468         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10469                 if (i >= cnt_of_skipped) {
10470                         break;
10471                 }
10472                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10473                         /* We don't report these */
10474                         continue;
10475                 }
10476                 if (at->rec.data.tsn == advance_peer_ack_point) {
10477                         at->rec.data.fwd_tsn_cnt = 0;
10478                 }
10479                 if (asoc->idata_supported) {
10480                         strseq_m->sid = htons(at->rec.data.sid);
10481                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10482                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10483                         } else {
10484                                 strseq_m->flags = 0;
10485                         }
10486                         strseq_m->mid = htonl(at->rec.data.mid);
10487                         strseq_m++;
10488                 } else {
10489                         strseq->sid = htons(at->rec.data.sid);
10490                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10491                         strseq++;
10492                 }
10493                 i++;
10494         }
10495         return;
10496 }
10497
10498 void
10499 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10500 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10501     SCTP_UNUSED
10502 #endif
10503 )
10504 {
10505         /*-
10506          * Queue up a SACK or NR-SACK in the control queue.
10507          * We must first check to see if a SACK or NR-SACK is
10508          * somehow on the control queue.
10509          * If so, we will take and and remove the old one.
10510          */
10511         struct sctp_association *asoc;
10512         struct sctp_tmit_chunk *chk, *a_chk;
10513         struct sctp_sack_chunk *sack;
10514         struct sctp_nr_sack_chunk *nr_sack;
10515         struct sctp_gap_ack_block *gap_descriptor;
10516         const struct sack_track *selector;
10517         int mergeable = 0;
10518         int offset;
10519         caddr_t limit;
10520         uint32_t *dup;
10521         int limit_reached = 0;
10522         unsigned int i, siz, j;
10523         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10524         int num_dups = 0;
10525         int space_req;
10526         uint32_t highest_tsn;
10527         uint8_t flags;
10528         uint8_t type;
10529         uint8_t tsn_map;
10530
10531         if (stcb->asoc.nrsack_supported == 1) {
10532                 type = SCTP_NR_SELECTIVE_ACK;
10533         } else {
10534                 type = SCTP_SELECTIVE_ACK;
10535         }
10536         a_chk = NULL;
10537         asoc = &stcb->asoc;
10538         SCTP_TCB_LOCK_ASSERT(stcb);
10539         if (asoc->last_data_chunk_from == NULL) {
10540                 /* Hmm we never received anything */
10541                 return;
10542         }
10543         sctp_slide_mapping_arrays(stcb);
10544         sctp_set_rwnd(stcb, asoc);
10545         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10546                 if (chk->rec.chunk_id.id == type) {
10547                         /* Hmm, found a sack already on queue, remove it */
10548                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10549                         asoc->ctrl_queue_cnt--;
10550                         a_chk = chk;
10551                         if (a_chk->data) {
10552                                 sctp_m_freem(a_chk->data);
10553                                 a_chk->data = NULL;
10554                         }
10555                         if (a_chk->whoTo) {
10556                                 sctp_free_remote_addr(a_chk->whoTo);
10557                                 a_chk->whoTo = NULL;
10558                         }
10559                         break;
10560                 }
10561         }
10562         if (a_chk == NULL) {
10563                 sctp_alloc_a_chunk(stcb, a_chk);
10564                 if (a_chk == NULL) {
10565                         /* No memory so we drop the idea, and set a timer */
10566                         if (stcb->asoc.delayed_ack) {
10567                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10568                                     stcb->sctp_ep, stcb, NULL,
10569                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10570                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10571                                     stcb->sctp_ep, stcb, NULL);
10572                         } else {
10573                                 stcb->asoc.send_sack = 1;
10574                         }
10575                         return;
10576                 }
10577                 a_chk->copy_by_ref = 0;
10578                 a_chk->rec.chunk_id.id = type;
10579                 a_chk->rec.chunk_id.can_take_data = 1;
10580         }
10581         /* Clear our pkt counts */
10582         asoc->data_pkts_seen = 0;
10583
10584         a_chk->flags = 0;
10585         a_chk->asoc = asoc;
10586         a_chk->snd_count = 0;
10587         a_chk->send_size = 0;   /* fill in later */
10588         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10589         a_chk->whoTo = NULL;
10590
10591         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10592                 /*-
10593                  * Ok, the destination for the SACK is unreachable, lets see if
10594                  * we can select an alternate to asoc->last_data_chunk_from
10595                  */
10596                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10597                 if (a_chk->whoTo == NULL) {
10598                         /* Nope, no alternate */
10599                         a_chk->whoTo = asoc->last_data_chunk_from;
10600                 }
10601         } else {
10602                 a_chk->whoTo = asoc->last_data_chunk_from;
10603         }
10604         if (a_chk->whoTo) {
10605                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10606         }
10607         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10608                 highest_tsn = asoc->highest_tsn_inside_map;
10609         } else {
10610                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10611         }
10612         if (highest_tsn == asoc->cumulative_tsn) {
10613                 /* no gaps */
10614                 if (type == SCTP_SELECTIVE_ACK) {
10615                         space_req = sizeof(struct sctp_sack_chunk);
10616                 } else {
10617                         space_req = sizeof(struct sctp_nr_sack_chunk);
10618                 }
10619         } else {
10620                 /* gaps get a cluster */
10621                 space_req = MCLBYTES;
10622         }
10623         /* Ok now lets formulate a MBUF with our sack */
10624         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10625         if ((a_chk->data == NULL) ||
10626             (a_chk->whoTo == NULL)) {
10627                 /* rats, no mbuf memory */
10628                 if (a_chk->data) {
10629                         /* was a problem with the destination */
10630                         sctp_m_freem(a_chk->data);
10631                         a_chk->data = NULL;
10632                 }
10633                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10634                 /* sa_ignore NO_NULL_CHK */
10635                 if (stcb->asoc.delayed_ack) {
10636                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10637                             stcb->sctp_ep, stcb, NULL,
10638                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10639                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10640                             stcb->sctp_ep, stcb, NULL);
10641                 } else {
10642                         stcb->asoc.send_sack = 1;
10643                 }
10644                 return;
10645         }
10646         /* ok, lets go through and fill it in */
10647         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10648         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10649         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10650                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10651         }
10652         limit = mtod(a_chk->data, caddr_t);
10653         limit += space;
10654
10655         flags = 0;
10656
10657         if ((asoc->sctp_cmt_on_off > 0) &&
10658             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10659                 /*-
10660                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10661                  * received, then set high bit to 1, else 0. Reset
10662                  * pkts_rcvd.
10663                  */
10664                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10665                 asoc->cmt_dac_pkts_rcvd = 0;
10666         }
10667 #ifdef SCTP_ASOCLOG_OF_TSNS
10668         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10669         stcb->asoc.cumack_log_atsnt++;
10670         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10671                 stcb->asoc.cumack_log_atsnt = 0;
10672         }
10673 #endif
10674         /* reset the readers interpretation */
10675         stcb->freed_by_sorcv_sincelast = 0;
10676
10677         if (type == SCTP_SELECTIVE_ACK) {
10678                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10679                 nr_sack = NULL;
10680                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10681                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10682                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10683                 } else {
10684                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10685                 }
10686         } else {
10687                 sack = NULL;
10688                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10689                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10690                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10691                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10692                 } else {
10693                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10694                 }
10695         }
10696
10697         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10698                 offset = 1;
10699         } else {
10700                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10701         }
10702         if (((type == SCTP_SELECTIVE_ACK) &&
10703             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10704             ((type == SCTP_NR_SELECTIVE_ACK) &&
10705             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10706                 /* we have a gap .. maybe */
10707                 for (i = 0; i < siz; i++) {
10708                         tsn_map = asoc->mapping_array[i];
10709                         if (type == SCTP_SELECTIVE_ACK) {
10710                                 tsn_map |= asoc->nr_mapping_array[i];
10711                         }
10712                         if (i == 0) {
10713                                 /*
10714                                  * Clear all bits corresponding to TSNs
10715                                  * smaller or equal to the cumulative TSN.
10716                                  */
10717                                 tsn_map &= (~0U << (1 - offset));
10718                         }
10719                         selector = &sack_array[tsn_map];
10720                         if (mergeable && selector->right_edge) {
10721                                 /*
10722                                  * Backup, left and right edges were ok to
10723                                  * merge.
10724                                  */
10725                                 num_gap_blocks--;
10726                                 gap_descriptor--;
10727                         }
10728                         if (selector->num_entries == 0)
10729                                 mergeable = 0;
10730                         else {
10731                                 for (j = 0; j < selector->num_entries; j++) {
10732                                         if (mergeable && selector->right_edge) {
10733                                                 /*
10734                                                  * do a merge by NOT setting
10735                                                  * the left side
10736                                                  */
10737                                                 mergeable = 0;
10738                                         } else {
10739                                                 /*
10740                                                  * no merge, set the left
10741                                                  * side
10742                                                  */
10743                                                 mergeable = 0;
10744                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10745                                         }
10746                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10747                                         num_gap_blocks++;
10748                                         gap_descriptor++;
10749                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10750                                                 /* no more room */
10751                                                 limit_reached = 1;
10752                                                 break;
10753                                         }
10754                                 }
10755                                 if (selector->left_edge) {
10756                                         mergeable = 1;
10757                                 }
10758                         }
10759                         if (limit_reached) {
10760                                 /* Reached the limit stop */
10761                                 break;
10762                         }
10763                         offset += 8;
10764                 }
10765         }
10766         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10767             (limit_reached == 0)) {
10768
10769                 mergeable = 0;
10770
10771                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10772                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10773                 } else {
10774                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10775                 }
10776
10777                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10778                         offset = 1;
10779                 } else {
10780                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10781                 }
10782                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10783                         /* we have a gap .. maybe */
10784                         for (i = 0; i < siz; i++) {
10785                                 tsn_map = asoc->nr_mapping_array[i];
10786                                 if (i == 0) {
10787                                         /*
10788                                          * Clear all bits corresponding to
10789                                          * TSNs smaller or equal to the
10790                                          * cumulative TSN.
10791                                          */
10792                                         tsn_map &= (~0U << (1 - offset));
10793                                 }
10794                                 selector = &sack_array[tsn_map];
10795                                 if (mergeable && selector->right_edge) {
10796                                         /*
10797                                          * Backup, left and right edges were
10798                                          * ok to merge.
10799                                          */
10800                                         num_nr_gap_blocks--;
10801                                         gap_descriptor--;
10802                                 }
10803                                 if (selector->num_entries == 0)
10804                                         mergeable = 0;
10805                                 else {
10806                                         for (j = 0; j < selector->num_entries; j++) {
10807                                                 if (mergeable && selector->right_edge) {
10808                                                         /*
10809                                                          * do a merge by NOT
10810                                                          * setting the left
10811                                                          * side
10812                                                          */
10813                                                         mergeable = 0;
10814                                                 } else {
10815                                                         /*
10816                                                          * no merge, set the
10817                                                          * left side
10818                                                          */
10819                                                         mergeable = 0;
10820                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10821                                                 }
10822                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10823                                                 num_nr_gap_blocks++;
10824                                                 gap_descriptor++;
10825                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10826                                                         /* no more room */
10827                                                         limit_reached = 1;
10828                                                         break;
10829                                                 }
10830                                         }
10831                                         if (selector->left_edge) {
10832                                                 mergeable = 1;
10833                                         }
10834                                 }
10835                                 if (limit_reached) {
10836                                         /* Reached the limit stop */
10837                                         break;
10838                                 }
10839                                 offset += 8;
10840                         }
10841                 }
10842         }
10843         /* now we must add any dups we are going to report. */
10844         if ((limit_reached == 0) && (asoc->numduptsns)) {
10845                 dup = (uint32_t *)gap_descriptor;
10846                 for (i = 0; i < asoc->numduptsns; i++) {
10847                         *dup = htonl(asoc->dup_tsns[i]);
10848                         dup++;
10849                         num_dups++;
10850                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10851                                 /* no more room */
10852                                 break;
10853                         }
10854                 }
10855                 asoc->numduptsns = 0;
10856         }
10857         /*
10858          * now that the chunk is prepared queue it to the control chunk
10859          * queue.
10860          */
10861         if (type == SCTP_SELECTIVE_ACK) {
10862                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10863                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10864                     num_dups * sizeof(int32_t));
10865                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10866                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10867                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10868                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10869                 sack->sack.num_dup_tsns = htons(num_dups);
10870                 sack->ch.chunk_type = type;
10871                 sack->ch.chunk_flags = flags;
10872                 sack->ch.chunk_length = htons(a_chk->send_size);
10873         } else {
10874                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10875                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10876                     num_dups * sizeof(int32_t));
10877                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10878                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10879                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10880                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10881                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10882                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10883                 nr_sack->nr_sack.reserved = 0;
10884                 nr_sack->ch.chunk_type = type;
10885                 nr_sack->ch.chunk_flags = flags;
10886                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10887         }
10888         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10889         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10890         asoc->ctrl_queue_cnt++;
10891         asoc->send_sack = 0;
10892         SCTP_STAT_INCR(sctps_sendsacks);
10893         return;
10894 }
10895
10896 void
10897 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10898 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10899     SCTP_UNUSED
10900 #endif
10901 )
10902 {
10903         struct mbuf *m_abort, *m, *m_last;
10904         struct mbuf *m_out, *m_end = NULL;
10905         struct sctp_abort_chunk *abort;
10906         struct sctp_auth_chunk *auth = NULL;
10907         struct sctp_nets *net;
10908         uint32_t vtag;
10909         uint32_t auth_offset = 0;
10910         int error;
10911         uint16_t cause_len, chunk_len, padding_len;
10912
10913         SCTP_TCB_LOCK_ASSERT(stcb);
10914         /*-
10915          * Add an AUTH chunk, if chunk requires it and save the offset into
10916          * the chain for AUTH
10917          */
10918         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10919             stcb->asoc.peer_auth_chunks)) {
10920                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10921                     stcb, SCTP_ABORT_ASSOCIATION);
10922                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10923         } else {
10924                 m_out = NULL;
10925         }
10926         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10927         if (m_abort == NULL) {
10928                 if (m_out) {
10929                         sctp_m_freem(m_out);
10930                 }
10931                 if (operr) {
10932                         sctp_m_freem(operr);
10933                 }
10934                 return;
10935         }
10936         /* link in any error */
10937         SCTP_BUF_NEXT(m_abort) = operr;
10938         cause_len = 0;
10939         m_last = NULL;
10940         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10941                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10942                 if (SCTP_BUF_NEXT(m) == NULL) {
10943                         m_last = m;
10944                 }
10945         }
10946         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10947         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10948         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10949         if (m_out == NULL) {
10950                 /* NO Auth chunk prepended, so reserve space in front */
10951                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10952                 m_out = m_abort;
10953         } else {
10954                 /* Put AUTH chunk at the front of the chain */
10955                 SCTP_BUF_NEXT(m_end) = m_abort;
10956         }
10957         if (stcb->asoc.alternate) {
10958                 net = stcb->asoc.alternate;
10959         } else {
10960                 net = stcb->asoc.primary_destination;
10961         }
10962         /* Fill in the ABORT chunk header. */
10963         abort = mtod(m_abort, struct sctp_abort_chunk *);
10964         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10965         if (stcb->asoc.peer_vtag == 0) {
10966                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10967                 vtag = stcb->asoc.my_vtag;
10968                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10969         } else {
10970                 vtag = stcb->asoc.peer_vtag;
10971                 abort->ch.chunk_flags = 0;
10972         }
10973         abort->ch.chunk_length = htons(chunk_len);
10974         /* Add padding, if necessary. */
10975         if (padding_len > 0) {
10976                 if ((m_last == NULL) ||
10977                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10978                         sctp_m_freem(m_out);
10979                         return;
10980                 }
10981         }
10982         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10983             (struct sockaddr *)&net->ro._l_addr,
10984             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10985             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10986             stcb->asoc.primary_destination->port, NULL,
10987             0, 0,
10988             so_locked))) {
10989                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10990                 if (error == ENOBUFS) {
10991                         stcb->asoc.ifp_had_enobuf = 1;
10992                         SCTP_STAT_INCR(sctps_lowlevelerr);
10993                 }
10994         } else {
10995                 stcb->asoc.ifp_had_enobuf = 0;
10996         }
10997         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10998 }
10999
11000 void
11001 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11002     struct sctp_nets *net,
11003     int reflect_vtag)
11004 {
11005         /* formulate and SEND a SHUTDOWN-COMPLETE */
11006         struct mbuf *m_shutdown_comp;
11007         struct sctp_shutdown_complete_chunk *shutdown_complete;
11008         uint32_t vtag;
11009         int error;
11010         uint8_t flags;
11011
11012         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11013         if (m_shutdown_comp == NULL) {
11014                 /* no mbuf's */
11015                 return;
11016         }
11017         if (reflect_vtag) {
11018                 flags = SCTP_HAD_NO_TCB;
11019                 vtag = stcb->asoc.my_vtag;
11020         } else {
11021                 flags = 0;
11022                 vtag = stcb->asoc.peer_vtag;
11023         }
11024         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11025         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11026         shutdown_complete->ch.chunk_flags = flags;
11027         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11028         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11029         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11030             (struct sockaddr *)&net->ro._l_addr,
11031             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11032             stcb->sctp_ep->sctp_lport, stcb->rport,
11033             htonl(vtag),
11034             net->port, NULL,
11035             0, 0,
11036             SCTP_SO_NOT_LOCKED))) {
11037                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11038                 if (error == ENOBUFS) {
11039                         stcb->asoc.ifp_had_enobuf = 1;
11040                         SCTP_STAT_INCR(sctps_lowlevelerr);
11041                 }
11042         } else {
11043                 stcb->asoc.ifp_had_enobuf = 0;
11044         }
11045         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11046         return;
11047 }
11048
11049 static void
11050 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11051     struct sctphdr *sh, uint32_t vtag,
11052     uint8_t type, struct mbuf *cause,
11053     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11054     uint32_t vrf_id, uint16_t port)
11055 {
11056         struct mbuf *o_pak;
11057         struct mbuf *mout;
11058         struct sctphdr *shout;
11059         struct sctp_chunkhdr *ch;
11060 #if defined(INET) || defined(INET6)
11061         struct udphdr *udp;
11062 #endif
11063         int ret, len, cause_len, padding_len;
11064 #ifdef INET
11065         struct sockaddr_in *src_sin, *dst_sin;
11066         struct ip *ip;
11067 #endif
11068 #ifdef INET6
11069         struct sockaddr_in6 *src_sin6, *dst_sin6;
11070         struct ip6_hdr *ip6;
11071 #endif
11072
11073         /* Compute the length of the cause and add final padding. */
11074         cause_len = 0;
11075         if (cause != NULL) {
11076                 struct mbuf *m_at, *m_last = NULL;
11077
11078                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11079                         if (SCTP_BUF_NEXT(m_at) == NULL)
11080                                 m_last = m_at;
11081                         cause_len += SCTP_BUF_LEN(m_at);
11082                 }
11083                 padding_len = cause_len % 4;
11084                 if (padding_len != 0) {
11085                         padding_len = 4 - padding_len;
11086                 }
11087                 if (padding_len != 0) {
11088                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11089                                 sctp_m_freem(cause);
11090                                 return;
11091                         }
11092                 }
11093         } else {
11094                 padding_len = 0;
11095         }
11096         /* Get an mbuf for the header. */
11097         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11098         switch (dst->sa_family) {
11099 #ifdef INET
11100         case AF_INET:
11101                 len += sizeof(struct ip);
11102                 break;
11103 #endif
11104 #ifdef INET6
11105         case AF_INET6:
11106                 len += sizeof(struct ip6_hdr);
11107                 break;
11108 #endif
11109         default:
11110                 break;
11111         }
11112 #if defined(INET) || defined(INET6)
11113         if (port) {
11114                 len += sizeof(struct udphdr);
11115         }
11116 #endif
11117         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11118         if (mout == NULL) {
11119                 if (cause) {
11120                         sctp_m_freem(cause);
11121                 }
11122                 return;
11123         }
11124         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11125         SCTP_BUF_LEN(mout) = len;
11126         SCTP_BUF_NEXT(mout) = cause;
11127         M_SETFIB(mout, fibnum);
11128         mout->m_pkthdr.flowid = mflowid;
11129         M_HASHTYPE_SET(mout, mflowtype);
11130 #ifdef INET
11131         ip = NULL;
11132 #endif
11133 #ifdef INET6
11134         ip6 = NULL;
11135 #endif
11136         switch (dst->sa_family) {
11137 #ifdef INET
11138         case AF_INET:
11139                 src_sin = (struct sockaddr_in *)src;
11140                 dst_sin = (struct sockaddr_in *)dst;
11141                 ip = mtod(mout, struct ip *);
11142                 ip->ip_v = IPVERSION;
11143                 ip->ip_hl = (sizeof(struct ip) >> 2);
11144                 ip->ip_tos = 0;
11145                 ip->ip_off = htons(IP_DF);
11146                 ip_fillid(ip);
11147                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11148                 if (port) {
11149                         ip->ip_p = IPPROTO_UDP;
11150                 } else {
11151                         ip->ip_p = IPPROTO_SCTP;
11152                 }
11153                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11154                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11155                 ip->ip_sum = 0;
11156                 len = sizeof(struct ip);
11157                 shout = (struct sctphdr *)((caddr_t)ip + len);
11158                 break;
11159 #endif
11160 #ifdef INET6
11161         case AF_INET6:
11162                 src_sin6 = (struct sockaddr_in6 *)src;
11163                 dst_sin6 = (struct sockaddr_in6 *)dst;
11164                 ip6 = mtod(mout, struct ip6_hdr *);
11165                 ip6->ip6_flow = htonl(0x60000000);
11166                 if (V_ip6_auto_flowlabel) {
11167                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11168                 }
11169                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11170                 if (port) {
11171                         ip6->ip6_nxt = IPPROTO_UDP;
11172                 } else {
11173                         ip6->ip6_nxt = IPPROTO_SCTP;
11174                 }
11175                 ip6->ip6_src = dst_sin6->sin6_addr;
11176                 ip6->ip6_dst = src_sin6->sin6_addr;
11177                 len = sizeof(struct ip6_hdr);
11178                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11179                 break;
11180 #endif
11181         default:
11182                 len = 0;
11183                 shout = mtod(mout, struct sctphdr *);
11184                 break;
11185         }
11186 #if defined(INET) || defined(INET6)
11187         if (port) {
11188                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11189                         sctp_m_freem(mout);
11190                         return;
11191                 }
11192                 udp = (struct udphdr *)shout;
11193                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11194                 udp->uh_dport = port;
11195                 udp->uh_sum = 0;
11196                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11197                     sizeof(struct sctphdr) +
11198                     sizeof(struct sctp_chunkhdr) +
11199                     cause_len + padding_len));
11200                 len += sizeof(struct udphdr);
11201                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11202         } else {
11203                 udp = NULL;
11204         }
11205 #endif
11206         shout->src_port = sh->dest_port;
11207         shout->dest_port = sh->src_port;
11208         shout->checksum = 0;
11209         if (vtag) {
11210                 shout->v_tag = htonl(vtag);
11211         } else {
11212                 shout->v_tag = sh->v_tag;
11213         }
11214         len += sizeof(struct sctphdr);
11215         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11216         ch->chunk_type = type;
11217         if (vtag) {
11218                 ch->chunk_flags = 0;
11219         } else {
11220                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11221         }
11222         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11223         len += sizeof(struct sctp_chunkhdr);
11224         len += cause_len + padding_len;
11225
11226         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11227                 sctp_m_freem(mout);
11228                 return;
11229         }
11230         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11231         switch (dst->sa_family) {
11232 #ifdef INET
11233         case AF_INET:
11234                 if (port) {
11235                         if (V_udp_cksum) {
11236                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11237                         } else {
11238                                 udp->uh_sum = 0;
11239                         }
11240                 }
11241                 ip->ip_len = htons(len);
11242                 if (port) {
11243                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11244                         SCTP_STAT_INCR(sctps_sendswcrc);
11245                         if (V_udp_cksum) {
11246                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11247                         }
11248                 } else {
11249                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11250                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11251                         SCTP_STAT_INCR(sctps_sendhwcrc);
11252                 }
11253 #ifdef SCTP_PACKET_LOGGING
11254                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11255                         sctp_packet_log(o_pak);
11256                 }
11257 #endif
11258                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11259                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11260                 break;
11261 #endif
11262 #ifdef INET6
11263         case AF_INET6:
11264                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11265                 if (port) {
11266                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11267                         SCTP_STAT_INCR(sctps_sendswcrc);
11268                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11269                                 udp->uh_sum = 0xffff;
11270                         }
11271                 } else {
11272                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11273                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11274                         SCTP_STAT_INCR(sctps_sendhwcrc);
11275                 }
11276 #ifdef SCTP_PACKET_LOGGING
11277                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11278                         sctp_packet_log(o_pak);
11279                 }
11280 #endif
11281                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11282                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11283                 break;
11284 #endif
11285         default:
11286                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11287                     dst->sa_family);
11288                 sctp_m_freem(mout);
11289                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11290                 return;
11291         }
11292         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
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
12158         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12159         if (chk->data == NULL) {
12160                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12161                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12162                 return (ENOMEM);
12163         }
12164         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12165
12166         /* setup chunk parameters */
12167         chk->sent = SCTP_DATAGRAM_UNSENT;
12168         chk->snd_count = 0;
12169         if (stcb->asoc.alternate) {
12170                 chk->whoTo = stcb->asoc.alternate;
12171         } else {
12172                 chk->whoTo = stcb->asoc.primary_destination;
12173         }
12174         atomic_add_int(&chk->whoTo->ref_count, 1);
12175         ch = mtod(chk->data, struct sctp_chunkhdr *);
12176         ch->chunk_type = SCTP_STREAM_RESET;
12177         ch->chunk_flags = 0;
12178         ch->chunk_length = htons(chk->book_size);
12179         SCTP_BUF_LEN(chk->data) = chk->send_size;
12180
12181         seq = stcb->asoc.str_reset_seq_out;
12182         if (can_send_out_req) {
12183                 int ret;
12184
12185                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12186                 if (ret) {
12187                         seq++;
12188                         asoc->stream_reset_outstanding++;
12189                 }
12190         }
12191         if ((add_stream & 1) &&
12192             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12193                 /* Need to allocate more */
12194                 struct sctp_stream_out *oldstream;
12195                 struct sctp_stream_queue_pending *sp, *nsp;
12196                 int i;
12197 #if defined(SCTP_DETAILED_STR_STATS)
12198                 int j;
12199 #endif
12200
12201                 oldstream = stcb->asoc.strmout;
12202                 /* get some more */
12203                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12204                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12205                     SCTP_M_STRMO);
12206                 if (stcb->asoc.strmout == NULL) {
12207                         uint8_t x;
12208
12209                         stcb->asoc.strmout = oldstream;
12210                         /* Turn off the bit */
12211                         x = add_stream & 0xfe;
12212                         add_stream = x;
12213                         goto skip_stuff;
12214                 }
12215                 /*
12216                  * Ok now we proceed with copying the old out stuff and
12217                  * initializing the new stuff.
12218                  */
12219                 SCTP_TCB_SEND_LOCK(stcb);
12220                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12221                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12222                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12223                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12224                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12225                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12226                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12227                         stcb->asoc.strmout[i].sid = i;
12228                         stcb->asoc.strmout[i].state = oldstream[i].state;
12229                         /* FIX ME FIX ME */
12230                         /*
12231                          * This should be a SS_COPY operation FIX ME STREAM
12232                          * SCHEDULER EXPERT
12233                          */
12234                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12235                         /* now anything on those queues? */
12236                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12237                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12238                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12239                         }
12240
12241                 }
12242                 /* now the new streams */
12243                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12244                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12245                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12246                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12247 #if defined(SCTP_DETAILED_STR_STATS)
12248                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12249                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12250                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12251                         }
12252 #else
12253                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12254                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12255 #endif
12256                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12257                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12258                         stcb->asoc.strmout[i].sid = i;
12259                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12260                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12261                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12262                 }
12263                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12264                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12265                 SCTP_TCB_SEND_UNLOCK(stcb);
12266         }
12267 skip_stuff:
12268         if ((add_stream & 1) && (adding_o > 0)) {
12269                 asoc->strm_pending_add_size = adding_o;
12270                 asoc->peer_req_out = peer_asked;
12271                 sctp_add_an_out_stream(chk, seq, adding_o);
12272                 seq++;
12273                 asoc->stream_reset_outstanding++;
12274         }
12275         if ((add_stream & 2) && (adding_i > 0)) {
12276                 sctp_add_an_in_stream(chk, seq, adding_i);
12277                 seq++;
12278                 asoc->stream_reset_outstanding++;
12279         }
12280         if (send_in_req) {
12281                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12282                 seq++;
12283                 asoc->stream_reset_outstanding++;
12284         }
12285         if (send_tsn_req) {
12286                 sctp_add_stream_reset_tsn(chk, seq);
12287                 asoc->stream_reset_outstanding++;
12288         }
12289         asoc->str_reset = chk;
12290         /* insert the chunk for sending */
12291         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12292             chk,
12293             sctp_next);
12294         asoc->ctrl_queue_cnt++;
12295         if (stcb->asoc.send_sack) {
12296                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12297         }
12298         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12299         return (0);
12300 }
12301
12302 void
12303 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12304     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12305     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12306     uint32_t vrf_id, uint16_t port)
12307 {
12308         /* Don't respond to an ABORT with an ABORT. */
12309         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12310                 if (cause)
12311                         sctp_m_freem(cause);
12312                 return;
12313         }
12314         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12315             mflowtype, mflowid, fibnum,
12316             vrf_id, port);
12317         return;
12318 }
12319
12320 void
12321 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12322     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12323     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12324     uint32_t vrf_id, uint16_t port)
12325 {
12326         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12327             mflowtype, mflowid, fibnum,
12328             vrf_id, port);
12329         return;
12330 }
12331
12332 static struct mbuf *
12333 sctp_copy_resume(struct uio *uio,
12334     int max_send_len,
12335     int user_marks_eor,
12336     int *error,
12337     uint32_t *sndout,
12338     struct mbuf **new_tail)
12339 {
12340         struct mbuf *m;
12341
12342         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12343             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12344         if (m == NULL) {
12345                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12346                 *error = ENOBUFS;
12347         } else {
12348                 *sndout = m_length(m, NULL);
12349                 *new_tail = m_last(m);
12350         }
12351         return (m);
12352 }
12353
12354 static int
12355 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12356     struct uio *uio,
12357     int resv_upfront)
12358 {
12359         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12360             resv_upfront, 0);
12361         if (sp->data == NULL) {
12362                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12363                 return (ENOBUFS);
12364         }
12365
12366         sp->tail_mbuf = m_last(sp->data);
12367         return (0);
12368 }
12369
12370
12371
12372 static struct sctp_stream_queue_pending *
12373 sctp_copy_it_in(struct sctp_tcb *stcb,
12374     struct sctp_association *asoc,
12375     struct sctp_sndrcvinfo *srcv,
12376     struct uio *uio,
12377     struct sctp_nets *net,
12378     int max_send_len,
12379     int user_marks_eor,
12380     int *error)
12381 {
12382
12383         /*-
12384          * This routine must be very careful in its work. Protocol
12385          * processing is up and running so care must be taken to spl...()
12386          * when you need to do something that may effect the stcb/asoc. The
12387          * sb is locked however. When data is copied the protocol processing
12388          * should be enabled since this is a slower operation...
12389          */
12390         struct sctp_stream_queue_pending *sp = NULL;
12391         int resv_in_first;
12392
12393         *error = 0;
12394         /* Now can we send this? */
12395         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12396             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12397             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12398             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12399                 /* got data while shutting down */
12400                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12401                 *error = ECONNRESET;
12402                 goto out_now;
12403         }
12404         sctp_alloc_a_strmoq(stcb, sp);
12405         if (sp == NULL) {
12406                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12407                 *error = ENOMEM;
12408                 goto out_now;
12409         }
12410         sp->act_flags = 0;
12411         sp->sender_all_done = 0;
12412         sp->sinfo_flags = srcv->sinfo_flags;
12413         sp->timetolive = srcv->sinfo_timetolive;
12414         sp->ppid = srcv->sinfo_ppid;
12415         sp->context = srcv->sinfo_context;
12416         sp->fsn = 0;
12417         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12418
12419         sp->sid = srcv->sinfo_stream;
12420         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12421         if ((sp->length == (uint32_t)uio->uio_resid) &&
12422             ((user_marks_eor == 0) ||
12423             (srcv->sinfo_flags & SCTP_EOF) ||
12424             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12425                 sp->msg_is_complete = 1;
12426         } else {
12427                 sp->msg_is_complete = 0;
12428         }
12429         sp->sender_all_done = 0;
12430         sp->some_taken = 0;
12431         sp->put_last_out = 0;
12432         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12433         sp->data = sp->tail_mbuf = NULL;
12434         if (sp->length == 0) {
12435                 goto skip_copy;
12436         }
12437         if (srcv->sinfo_keynumber_valid) {
12438                 sp->auth_keyid = srcv->sinfo_keynumber;
12439         } else {
12440                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12441         }
12442         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12443                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12444                 sp->holds_key_ref = 1;
12445         }
12446         *error = sctp_copy_one(sp, uio, resv_in_first);
12447 skip_copy:
12448         if (*error) {
12449                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12450                 sp = NULL;
12451         } else {
12452                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12453                         sp->net = net;
12454                         atomic_add_int(&sp->net->ref_count, 1);
12455                 } else {
12456                         sp->net = NULL;
12457                 }
12458                 sctp_set_prsctp_policy(sp);
12459         }
12460 out_now:
12461         return (sp);
12462 }
12463
12464
12465 int
12466 sctp_sosend(struct socket *so,
12467     struct sockaddr *addr,
12468     struct uio *uio,
12469     struct mbuf *top,
12470     struct mbuf *control,
12471     int flags,
12472     struct thread *p
12473 )
12474 {
12475         int error, use_sndinfo = 0;
12476         struct sctp_sndrcvinfo sndrcvninfo;
12477         struct sockaddr *addr_to_use;
12478 #if defined(INET) && defined(INET6)
12479         struct sockaddr_in sin;
12480 #endif
12481
12482         if (control) {
12483                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12484                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12485                     sizeof(sndrcvninfo))) {
12486                         /* got one */
12487                         use_sndinfo = 1;
12488                 }
12489         }
12490         addr_to_use = addr;
12491 #if defined(INET) && defined(INET6)
12492         if ((addr) && (addr->sa_family == AF_INET6)) {
12493                 struct sockaddr_in6 *sin6;
12494
12495                 sin6 = (struct sockaddr_in6 *)addr;
12496                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12497                         in6_sin6_2_sin(&sin, sin6);
12498                         addr_to_use = (struct sockaddr *)&sin;
12499                 }
12500         }
12501 #endif
12502         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12503             control,
12504             flags,
12505             use_sndinfo ? &sndrcvninfo : NULL
12506             ,p
12507             );
12508         return (error);
12509 }
12510
12511
12512 int
12513 sctp_lower_sosend(struct socket *so,
12514     struct sockaddr *addr,
12515     struct uio *uio,
12516     struct mbuf *i_pak,
12517     struct mbuf *control,
12518     int flags,
12519     struct sctp_sndrcvinfo *srcv
12520     ,
12521     struct thread *p
12522 )
12523 {
12524         unsigned int sndlen = 0, max_len;
12525         int error, len;
12526         struct mbuf *top = NULL;
12527         int queue_only = 0, queue_only_for_init = 0;
12528         int free_cnt_applied = 0;
12529         int un_sent;
12530         int now_filled = 0;
12531         unsigned int inqueue_bytes = 0;
12532         struct sctp_block_entry be;
12533         struct sctp_inpcb *inp;
12534         struct sctp_tcb *stcb = NULL;
12535         struct timeval now;
12536         struct sctp_nets *net;
12537         struct sctp_association *asoc;
12538         struct sctp_inpcb *t_inp;
12539         int user_marks_eor;
12540         int create_lock_applied = 0;
12541         int nagle_applies = 0;
12542         int some_on_control = 0;
12543         int got_all_of_the_send = 0;
12544         int hold_tcblock = 0;
12545         int non_blocking = 0;
12546         uint32_t local_add_more, local_soresv = 0;
12547         uint16_t port;
12548         uint16_t sinfo_flags;
12549         sctp_assoc_t sinfo_assoc_id;
12550
12551         error = 0;
12552         net = NULL;
12553         stcb = NULL;
12554         asoc = NULL;
12555
12556         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12557         if (inp == NULL) {
12558                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12559                 error = EINVAL;
12560                 if (i_pak) {
12561                         SCTP_RELEASE_PKT(i_pak);
12562                 }
12563                 return (error);
12564         }
12565         if ((uio == NULL) && (i_pak == NULL)) {
12566                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12567                 return (EINVAL);
12568         }
12569         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12570         atomic_add_int(&inp->total_sends, 1);
12571         if (uio) {
12572                 if (uio->uio_resid < 0) {
12573                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12574                         return (EINVAL);
12575                 }
12576                 sndlen = (unsigned int)uio->uio_resid;
12577         } else {
12578                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12579                 sndlen = SCTP_HEADER_LEN(i_pak);
12580         }
12581         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12582             (void *)addr,
12583             sndlen);
12584         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12585             SCTP_IS_LISTENING(inp)) {
12586                 /* The listener can NOT send */
12587                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12588                 error = ENOTCONN;
12589                 goto out_unlocked;
12590         }
12591         /**
12592          * Pre-screen address, if one is given the sin-len
12593          * must be set correctly!
12594          */
12595         if (addr) {
12596                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12597
12598                 switch (raddr->sa.sa_family) {
12599 #ifdef INET
12600                 case AF_INET:
12601                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12602                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12603                                 error = EINVAL;
12604                                 goto out_unlocked;
12605                         }
12606                         port = raddr->sin.sin_port;
12607                         break;
12608 #endif
12609 #ifdef INET6
12610                 case AF_INET6:
12611                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12612                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12613                                 error = EINVAL;
12614                                 goto out_unlocked;
12615                         }
12616                         port = raddr->sin6.sin6_port;
12617                         break;
12618 #endif
12619                 default:
12620                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12621                         error = EAFNOSUPPORT;
12622                         goto out_unlocked;
12623                 }
12624         } else
12625                 port = 0;
12626
12627         if (srcv) {
12628                 sinfo_flags = srcv->sinfo_flags;
12629                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12630                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12631                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12632                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12633                         error = EINVAL;
12634                         goto out_unlocked;
12635                 }
12636                 if (srcv->sinfo_flags)
12637                         SCTP_STAT_INCR(sctps_sends_with_flags);
12638         } else {
12639                 sinfo_flags = inp->def_send.sinfo_flags;
12640                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12641         }
12642         if (sinfo_flags & SCTP_SENDALL) {
12643                 /* its a sendall */
12644                 error = sctp_sendall(inp, uio, top, srcv);
12645                 top = NULL;
12646                 goto out_unlocked;
12647         }
12648         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12649                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12650                 error = EINVAL;
12651                 goto out_unlocked;
12652         }
12653         /* now we must find the assoc */
12654         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12655             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12656                 SCTP_INP_RLOCK(inp);
12657                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12658                 if (stcb) {
12659                         SCTP_TCB_LOCK(stcb);
12660                         hold_tcblock = 1;
12661                 }
12662                 SCTP_INP_RUNLOCK(inp);
12663         } else if (sinfo_assoc_id) {
12664                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12665                 if (stcb != NULL) {
12666                         hold_tcblock = 1;
12667                 }
12668         } else if (addr) {
12669                 /*-
12670                  * Since we did not use findep we must
12671                  * increment it, and if we don't find a tcb
12672                  * decrement it.
12673                  */
12674                 SCTP_INP_WLOCK(inp);
12675                 SCTP_INP_INCR_REF(inp);
12676                 SCTP_INP_WUNLOCK(inp);
12677                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12678                 if (stcb == NULL) {
12679                         SCTP_INP_WLOCK(inp);
12680                         SCTP_INP_DECR_REF(inp);
12681                         SCTP_INP_WUNLOCK(inp);
12682                 } else {
12683                         hold_tcblock = 1;
12684                 }
12685         }
12686         if ((stcb == NULL) && (addr)) {
12687                 /* Possible implicit send? */
12688                 SCTP_ASOC_CREATE_LOCK(inp);
12689                 create_lock_applied = 1;
12690                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12691                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12692                         /* Should I really unlock ? */
12693                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12694                         error = EINVAL;
12695                         goto out_unlocked;
12696
12697                 }
12698                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12699                     (addr->sa_family == AF_INET6)) {
12700                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12701                         error = EINVAL;
12702                         goto out_unlocked;
12703                 }
12704                 SCTP_INP_WLOCK(inp);
12705                 SCTP_INP_INCR_REF(inp);
12706                 SCTP_INP_WUNLOCK(inp);
12707                 /* With the lock applied look again */
12708                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12709                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12710                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12711                 }
12712                 if (stcb == NULL) {
12713                         SCTP_INP_WLOCK(inp);
12714                         SCTP_INP_DECR_REF(inp);
12715                         SCTP_INP_WUNLOCK(inp);
12716                 } else {
12717                         hold_tcblock = 1;
12718                 }
12719                 if (error) {
12720                         goto out_unlocked;
12721                 }
12722                 if (t_inp != inp) {
12723                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12724                         error = ENOTCONN;
12725                         goto out_unlocked;
12726                 }
12727         }
12728         if (stcb == NULL) {
12729                 if (addr == NULL) {
12730                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12731                         error = ENOENT;
12732                         goto out_unlocked;
12733                 } else {
12734                         /* We must go ahead and start the INIT process */
12735                         uint32_t vrf_id;
12736
12737                         if ((sinfo_flags & SCTP_ABORT) ||
12738                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12739                                 /*-
12740                                  * User asks to abort a non-existant assoc,
12741                                  * or EOF a non-existant assoc with no data
12742                                  */
12743                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12744                                 error = ENOENT;
12745                                 goto out_unlocked;
12746                         }
12747                         /* get an asoc/stcb struct */
12748                         vrf_id = inp->def_vrf_id;
12749 #ifdef INVARIANTS
12750                         if (create_lock_applied == 0) {
12751                                 panic("Error, should hold create lock and I don't?");
12752                         }
12753 #endif
12754                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12755                             inp->sctp_ep.pre_open_stream_count,
12756                             inp->sctp_ep.port,
12757                             p);
12758                         if (stcb == NULL) {
12759                                 /* Error is setup for us in the call */
12760                                 goto out_unlocked;
12761                         }
12762                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12763                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12764                                 /*
12765                                  * Set the connected flag so we can queue
12766                                  * data
12767                                  */
12768                                 soisconnecting(so);
12769                         }
12770                         hold_tcblock = 1;
12771                         if (create_lock_applied) {
12772                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12773                                 create_lock_applied = 0;
12774                         } else {
12775                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12776                         }
12777                         /*
12778                          * Turn on queue only flag to prevent data from
12779                          * being sent
12780                          */
12781                         queue_only = 1;
12782                         asoc = &stcb->asoc;
12783                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12784                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12785
12786                         /* initialize authentication params for the assoc */
12787                         sctp_initialize_auth_params(inp, stcb);
12788
12789                         if (control) {
12790                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12791                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12792                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12793                                         hold_tcblock = 0;
12794                                         stcb = NULL;
12795                                         goto out_unlocked;
12796                                 }
12797                         }
12798                         /* out with the INIT */
12799                         queue_only_for_init = 1;
12800                         /*-
12801                          * we may want to dig in after this call and adjust the MTU
12802                          * value. It defaulted to 1500 (constant) but the ro
12803                          * structure may now have an update and thus we may need to
12804                          * change it BEFORE we append the message.
12805                          */
12806                 }
12807         } else
12808                 asoc = &stcb->asoc;
12809         if (srcv == NULL)
12810                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12811         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12812                 if (addr)
12813                         net = sctp_findnet(stcb, addr);
12814                 else
12815                         net = NULL;
12816                 if ((net == NULL) ||
12817                     ((port != 0) && (port != stcb->rport))) {
12818                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12819                         error = EINVAL;
12820                         goto out_unlocked;
12821                 }
12822         } else {
12823                 if (stcb->asoc.alternate) {
12824                         net = stcb->asoc.alternate;
12825                 } else {
12826                         net = stcb->asoc.primary_destination;
12827                 }
12828         }
12829         atomic_add_int(&stcb->total_sends, 1);
12830         /* Keep the stcb from being freed under our feet */
12831         atomic_add_int(&asoc->refcnt, 1);
12832         free_cnt_applied = 1;
12833
12834         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12835                 if (sndlen > asoc->smallest_mtu) {
12836                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12837                         error = EMSGSIZE;
12838                         goto out_unlocked;
12839                 }
12840         }
12841         if (SCTP_SO_IS_NBIO(so)
12842             || (flags & MSG_NBIO)
12843             ) {
12844                 non_blocking = 1;
12845         }
12846         /* would we block? */
12847         if (non_blocking) {
12848                 uint32_t amount;
12849
12850                 if (hold_tcblock == 0) {
12851                         SCTP_TCB_LOCK(stcb);
12852                         hold_tcblock = 1;
12853                 }
12854                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12855                 if (user_marks_eor == 0) {
12856                         amount = sndlen;
12857                 } else {
12858                         amount = 1;
12859                 }
12860                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12861                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12862                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12863                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12864                                 error = EMSGSIZE;
12865                         else
12866                                 error = EWOULDBLOCK;
12867                         goto out_unlocked;
12868                 }
12869                 stcb->asoc.sb_send_resv += sndlen;
12870                 SCTP_TCB_UNLOCK(stcb);
12871                 hold_tcblock = 0;
12872         } else {
12873                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12874         }
12875         local_soresv = sndlen;
12876         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12877                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12878                 error = ECONNRESET;
12879                 goto out_unlocked;
12880         }
12881         if (create_lock_applied) {
12882                 SCTP_ASOC_CREATE_UNLOCK(inp);
12883                 create_lock_applied = 0;
12884         }
12885         /* Is the stream no. valid? */
12886         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12887                 /* Invalid stream number */
12888                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12889                 error = EINVAL;
12890                 goto out_unlocked;
12891         }
12892         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12893             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12894                 /*
12895                  * Can't queue any data while stream reset is underway.
12896                  */
12897                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12898                         error = EAGAIN;
12899                 } else {
12900                         error = EINVAL;
12901                 }
12902                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12903                 goto out_unlocked;
12904         }
12905         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12906             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12907                 queue_only = 1;
12908         }
12909         /* we are now done with all control */
12910         if (control) {
12911                 sctp_m_freem(control);
12912                 control = NULL;
12913         }
12914         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12915             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12916             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12917             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12918                 if (srcv->sinfo_flags & SCTP_ABORT) {
12919                         ;
12920                 } else {
12921                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12922                         error = ECONNRESET;
12923                         goto out_unlocked;
12924                 }
12925         }
12926         /* Ok, we will attempt a msgsnd :> */
12927         if (p) {
12928                 p->td_ru.ru_msgsnd++;
12929         }
12930         /* Are we aborting? */
12931         if (srcv->sinfo_flags & SCTP_ABORT) {
12932                 struct mbuf *mm;
12933                 int tot_demand, tot_out = 0, max_out;
12934
12935                 SCTP_STAT_INCR(sctps_sends_with_abort);
12936                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12937                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12938                         /* It has to be up before we abort */
12939                         /* how big is the user initiated abort? */
12940                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12941                         error = EINVAL;
12942                         goto out;
12943                 }
12944                 if (hold_tcblock) {
12945                         SCTP_TCB_UNLOCK(stcb);
12946                         hold_tcblock = 0;
12947                 }
12948                 if (top) {
12949                         struct mbuf *cntm = NULL;
12950
12951                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12952                         if (sndlen != 0) {
12953                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12954                                         tot_out += SCTP_BUF_LEN(cntm);
12955                                 }
12956                         }
12957                 } else {
12958                         /* Must fit in a MTU */
12959                         tot_out = sndlen;
12960                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12961                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12962                                 /* To big */
12963                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12964                                 error = EMSGSIZE;
12965                                 goto out;
12966                         }
12967                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12968                 }
12969                 if (mm == NULL) {
12970                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12971                         error = ENOMEM;
12972                         goto out;
12973                 }
12974                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12975                 max_out -= sizeof(struct sctp_abort_msg);
12976                 if (tot_out > max_out) {
12977                         tot_out = max_out;
12978                 }
12979                 if (mm) {
12980                         struct sctp_paramhdr *ph;
12981
12982                         /* now move forward the data pointer */
12983                         ph = mtod(mm, struct sctp_paramhdr *);
12984                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12985                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12986                         ph++;
12987                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12988                         if (top == NULL) {
12989                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12990                                 if (error) {
12991                                         /*-
12992                                          * Here if we can't get his data we
12993                                          * still abort we just don't get to
12994                                          * send the users note :-0
12995                                          */
12996                                         sctp_m_freem(mm);
12997                                         mm = NULL;
12998                                 }
12999                         } else {
13000                                 if (sndlen != 0) {
13001                                         SCTP_BUF_NEXT(mm) = top;
13002                                 }
13003                         }
13004                 }
13005                 if (hold_tcblock == 0) {
13006                         SCTP_TCB_LOCK(stcb);
13007                 }
13008                 atomic_add_int(&stcb->asoc.refcnt, -1);
13009                 free_cnt_applied = 0;
13010                 /* release this lock, otherwise we hang on ourselves */
13011                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13012                 /* now relock the stcb so everything is sane */
13013                 hold_tcblock = 0;
13014                 stcb = NULL;
13015                 /*
13016                  * In this case top is already chained to mm avoid double
13017                  * free, since we free it below if top != NULL and driver
13018                  * would free it after sending the packet out
13019                  */
13020                 if (sndlen != 0) {
13021                         top = NULL;
13022                 }
13023                 goto out_unlocked;
13024         }
13025         /* Calculate the maximum we can send */
13026         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13027         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13028                 if (non_blocking) {
13029                         /* we already checked for non-blocking above. */
13030                         max_len = sndlen;
13031                 } else {
13032                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13033                 }
13034         } else {
13035                 max_len = 0;
13036         }
13037         if (hold_tcblock) {
13038                 SCTP_TCB_UNLOCK(stcb);
13039                 hold_tcblock = 0;
13040         }
13041         if (asoc->strmout == NULL) {
13042                 /* huh? software error */
13043                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13044                 error = EFAULT;
13045                 goto out_unlocked;
13046         }
13047
13048         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13049         if ((user_marks_eor == 0) &&
13050             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13051                 /* It will NEVER fit */
13052                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13053                 error = EMSGSIZE;
13054                 goto out_unlocked;
13055         }
13056         if ((uio == NULL) && user_marks_eor) {
13057                 /*-
13058                  * We do not support eeor mode for
13059                  * sending with mbuf chains (like sendfile).
13060                  */
13061                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13062                 error = EINVAL;
13063                 goto out_unlocked;
13064         }
13065
13066         if (user_marks_eor) {
13067                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13068         } else {
13069                 /*-
13070                  * For non-eeor the whole message must fit in
13071                  * the socket send buffer.
13072                  */
13073                 local_add_more = sndlen;
13074         }
13075         len = 0;
13076         if (non_blocking) {
13077                 goto skip_preblock;
13078         }
13079         if (((max_len <= local_add_more) &&
13080             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13081             (max_len == 0) ||
13082             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13083                 /* No room right now ! */
13084                 SOCKBUF_LOCK(&so->so_snd);
13085                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13086                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13087                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13088                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13089                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13090                             inqueue_bytes,
13091                             local_add_more,
13092                             stcb->asoc.stream_queue_cnt,
13093                             stcb->asoc.chunks_on_out_queue,
13094                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13095                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13096                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13097                         }
13098                         be.error = 0;
13099                         stcb->block_entry = &be;
13100                         error = sbwait(&so->so_snd);
13101                         stcb->block_entry = NULL;
13102                         if (error || so->so_error || be.error) {
13103                                 if (error == 0) {
13104                                         if (so->so_error)
13105                                                 error = so->so_error;
13106                                         if (be.error) {
13107                                                 error = be.error;
13108                                         }
13109                                 }
13110                                 SOCKBUF_UNLOCK(&so->so_snd);
13111                                 goto out_unlocked;
13112                         }
13113                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13114                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13115                                     asoc, stcb->asoc.total_output_queue_size);
13116                         }
13117                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13118                                 SOCKBUF_UNLOCK(&so->so_snd);
13119                                 goto out_unlocked;
13120                         }
13121                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13122                 }
13123                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13124                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13125                 } else {
13126                         max_len = 0;
13127                 }
13128                 SOCKBUF_UNLOCK(&so->so_snd);
13129         }
13130
13131 skip_preblock:
13132         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13133                 goto out_unlocked;
13134         }
13135         /*
13136          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13137          * case NOTE: uio will be null when top/mbuf is passed
13138          */
13139         if (sndlen == 0) {
13140                 if (srcv->sinfo_flags & SCTP_EOF) {
13141                         got_all_of_the_send = 1;
13142                         goto dataless_eof;
13143                 } else {
13144                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13145                         error = EINVAL;
13146                         goto out;
13147                 }
13148         }
13149         if (top == NULL) {
13150                 struct sctp_stream_queue_pending *sp;
13151                 struct sctp_stream_out *strm;
13152                 uint32_t sndout;
13153
13154                 SCTP_TCB_SEND_LOCK(stcb);
13155                 if ((asoc->stream_locked) &&
13156                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13157                         SCTP_TCB_SEND_UNLOCK(stcb);
13158                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13159                         error = EINVAL;
13160                         goto out;
13161                 }
13162                 SCTP_TCB_SEND_UNLOCK(stcb);
13163
13164                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13165                 if (strm->last_msg_incomplete == 0) {
13166         do_a_copy_in:
13167                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13168                         if (error) {
13169                                 goto out;
13170                         }
13171                         SCTP_TCB_SEND_LOCK(stcb);
13172                         if (sp->msg_is_complete) {
13173                                 strm->last_msg_incomplete = 0;
13174                                 asoc->stream_locked = 0;
13175                         } else {
13176                                 /*
13177                                  * Just got locked to this guy in case of an
13178                                  * interrupt.
13179                                  */
13180                                 strm->last_msg_incomplete = 1;
13181                                 if (stcb->asoc.idata_supported == 0) {
13182                                         asoc->stream_locked = 1;
13183                                         asoc->stream_locked_on = srcv->sinfo_stream;
13184                                 }
13185                                 sp->sender_all_done = 0;
13186                         }
13187                         sctp_snd_sb_alloc(stcb, sp->length);
13188                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13189                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13190                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13191                         }
13192                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13193                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13194                         SCTP_TCB_SEND_UNLOCK(stcb);
13195                 } else {
13196                         SCTP_TCB_SEND_LOCK(stcb);
13197                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13198                         SCTP_TCB_SEND_UNLOCK(stcb);
13199                         if (sp == NULL) {
13200                                 /* ???? Huh ??? last msg is gone */
13201 #ifdef INVARIANTS
13202                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13203 #else
13204                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13205                                 strm->last_msg_incomplete = 0;
13206 #endif
13207                                 goto do_a_copy_in;
13208
13209                         }
13210                 }
13211                 while (uio->uio_resid > 0) {
13212                         /* How much room do we have? */
13213                         struct mbuf *new_tail, *mm;
13214
13215                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13216                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13217                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13218                         else
13219                                 max_len = 0;
13220
13221                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13222                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13223                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13224                                 sndout = 0;
13225                                 new_tail = NULL;
13226                                 if (hold_tcblock) {
13227                                         SCTP_TCB_UNLOCK(stcb);
13228                                         hold_tcblock = 0;
13229                                 }
13230                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13231                                 if ((mm == NULL) || error) {
13232                                         if (mm) {
13233                                                 sctp_m_freem(mm);
13234                                         }
13235                                         goto out;
13236                                 }
13237                                 /* Update the mbuf and count */
13238                                 SCTP_TCB_SEND_LOCK(stcb);
13239                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13240                                         /*
13241                                          * we need to get out. Peer probably
13242                                          * aborted.
13243                                          */
13244                                         sctp_m_freem(mm);
13245                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13246                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13247                                                 error = ECONNRESET;
13248                                         }
13249                                         SCTP_TCB_SEND_UNLOCK(stcb);
13250                                         goto out;
13251                                 }
13252                                 if (sp->tail_mbuf) {
13253                                         /* tack it to the end */
13254                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13255                                         sp->tail_mbuf = new_tail;
13256                                 } else {
13257                                         /* A stolen mbuf */
13258                                         sp->data = mm;
13259                                         sp->tail_mbuf = new_tail;
13260                                 }
13261                                 sctp_snd_sb_alloc(stcb, sndout);
13262                                 atomic_add_int(&sp->length, sndout);
13263                                 len += sndout;
13264                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13265                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13266                                 }
13267
13268                                 /* Did we reach EOR? */
13269                                 if ((uio->uio_resid == 0) &&
13270                                     ((user_marks_eor == 0) ||
13271                                     (srcv->sinfo_flags & SCTP_EOF) ||
13272                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13273                                         sp->msg_is_complete = 1;
13274                                 } else {
13275                                         sp->msg_is_complete = 0;
13276                                 }
13277                                 SCTP_TCB_SEND_UNLOCK(stcb);
13278                         }
13279                         if (uio->uio_resid == 0) {
13280                                 /* got it all? */
13281                                 continue;
13282                         }
13283                         /* PR-SCTP? */
13284                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13285                                 /*
13286                                  * This is ugly but we must assure locking
13287                                  * order
13288                                  */
13289                                 if (hold_tcblock == 0) {
13290                                         SCTP_TCB_LOCK(stcb);
13291                                         hold_tcblock = 1;
13292                                 }
13293                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13294                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13295                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13296                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13297                                 else
13298                                         max_len = 0;
13299                                 if (max_len > 0) {
13300                                         continue;
13301                                 }
13302                                 SCTP_TCB_UNLOCK(stcb);
13303                                 hold_tcblock = 0;
13304                         }
13305                         /* wait for space now */
13306                         if (non_blocking) {
13307                                 /* Non-blocking io in place out */
13308                                 goto skip_out_eof;
13309                         }
13310                         /* What about the INIT, send it maybe */
13311                         if (queue_only_for_init) {
13312                                 if (hold_tcblock == 0) {
13313                                         SCTP_TCB_LOCK(stcb);
13314                                         hold_tcblock = 1;
13315                                 }
13316                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13317                                         /* a collision took us forward? */
13318                                         queue_only = 0;
13319                                 } else {
13320                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13321                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13322                                         queue_only = 1;
13323                                 }
13324                         }
13325                         if ((net->flight_size > net->cwnd) &&
13326                             (asoc->sctp_cmt_on_off == 0)) {
13327                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13328                                 queue_only = 1;
13329                         } else if (asoc->ifp_had_enobuf) {
13330                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13331                                 if (net->flight_size > (2 * net->mtu)) {
13332                                         queue_only = 1;
13333                                 }
13334                                 asoc->ifp_had_enobuf = 0;
13335                         }
13336                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13337                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13338                             (stcb->asoc.total_flight > 0) &&
13339                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13340                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13341
13342                                 /*-
13343                                  * Ok, Nagle is set on and we have data outstanding.
13344                                  * Don't send anything and let SACKs drive out the
13345                                  * data unless we have a "full" segment to send.
13346                                  */
13347                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13348                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13349                                 }
13350                                 SCTP_STAT_INCR(sctps_naglequeued);
13351                                 nagle_applies = 1;
13352                         } else {
13353                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13354                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13355                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13356                                 }
13357                                 SCTP_STAT_INCR(sctps_naglesent);
13358                                 nagle_applies = 0;
13359                         }
13360                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13361
13362                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13363                                     nagle_applies, un_sent);
13364                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13365                                     stcb->asoc.total_flight,
13366                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13367                         }
13368                         if (queue_only_for_init)
13369                                 queue_only_for_init = 0;
13370                         if ((queue_only == 0) && (nagle_applies == 0)) {
13371                                 /*-
13372                                  * need to start chunk output
13373                                  * before blocking.. note that if
13374                                  * a lock is already applied, then
13375                                  * the input via the net is happening
13376                                  * and I don't need to start output :-D
13377                                  */
13378                                 if (hold_tcblock == 0) {
13379                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13380                                                 hold_tcblock = 1;
13381                                                 sctp_chunk_output(inp,
13382                                                     stcb,
13383                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13384                                         }
13385                                 } else {
13386                                         sctp_chunk_output(inp,
13387                                             stcb,
13388                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13389                                 }
13390                                 if (hold_tcblock == 1) {
13391                                         SCTP_TCB_UNLOCK(stcb);
13392                                         hold_tcblock = 0;
13393                                 }
13394                         }
13395                         SOCKBUF_LOCK(&so->so_snd);
13396                         /*-
13397                          * This is a bit strange, but I think it will
13398                          * work. The total_output_queue_size is locked and
13399                          * protected by the TCB_LOCK, which we just released.
13400                          * There is a race that can occur between releasing it
13401                          * above, and me getting the socket lock, where sacks
13402                          * come in but we have not put the SB_WAIT on the
13403                          * so_snd buffer to get the wakeup. After the LOCK
13404                          * is applied the sack_processing will also need to
13405                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13406                          * once we have the socket buffer lock if we recheck the
13407                          * size we KNOW we will get to sleep safely with the
13408                          * wakeup flag in place.
13409                          */
13410                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13411                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13412                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13413                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13414                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13415                                             asoc, (size_t)uio->uio_resid);
13416                                 }
13417                                 be.error = 0;
13418                                 stcb->block_entry = &be;
13419                                 error = sbwait(&so->so_snd);
13420                                 stcb->block_entry = NULL;
13421
13422                                 if (error || so->so_error || be.error) {
13423                                         if (error == 0) {
13424                                                 if (so->so_error)
13425                                                         error = so->so_error;
13426                                                 if (be.error) {
13427                                                         error = be.error;
13428                                                 }
13429                                         }
13430                                         SOCKBUF_UNLOCK(&so->so_snd);
13431                                         goto out_unlocked;
13432                                 }
13433
13434                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13435                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13436                                             asoc, stcb->asoc.total_output_queue_size);
13437                                 }
13438                         }
13439                         SOCKBUF_UNLOCK(&so->so_snd);
13440                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13441                                 goto out_unlocked;
13442                         }
13443                 }
13444                 SCTP_TCB_SEND_LOCK(stcb);
13445                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13446                         SCTP_TCB_SEND_UNLOCK(stcb);
13447                         goto out_unlocked;
13448                 }
13449                 if (sp) {
13450                         if (sp->msg_is_complete == 0) {
13451                                 strm->last_msg_incomplete = 1;
13452                                 if (stcb->asoc.idata_supported == 0) {
13453                                         asoc->stream_locked = 1;
13454                                         asoc->stream_locked_on = srcv->sinfo_stream;
13455                                 }
13456                         } else {
13457                                 sp->sender_all_done = 1;
13458                                 strm->last_msg_incomplete = 0;
13459                                 asoc->stream_locked = 0;
13460                         }
13461                 } else {
13462                         SCTP_PRINTF("Huh no sp TSNH?\n");
13463                         strm->last_msg_incomplete = 0;
13464                         asoc->stream_locked = 0;
13465                 }
13466                 SCTP_TCB_SEND_UNLOCK(stcb);
13467                 if (uio->uio_resid == 0) {
13468                         got_all_of_the_send = 1;
13469                 }
13470         } else {
13471                 /* We send in a 0, since we do NOT have any locks */
13472                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13473                 top = NULL;
13474                 if (srcv->sinfo_flags & SCTP_EOF) {
13475                         /*
13476                          * This should only happen for Panda for the mbuf
13477                          * send case, which does NOT yet support EEOR mode.
13478                          * Thus, we can just set this flag to do the proper
13479                          * EOF handling.
13480                          */
13481                         got_all_of_the_send = 1;
13482                 }
13483         }
13484         if (error) {
13485                 goto out;
13486         }
13487 dataless_eof:
13488         /* EOF thing ? */
13489         if ((srcv->sinfo_flags & SCTP_EOF) &&
13490             (got_all_of_the_send == 1)) {
13491                 SCTP_STAT_INCR(sctps_sends_with_eof);
13492                 error = 0;
13493                 if (hold_tcblock == 0) {
13494                         SCTP_TCB_LOCK(stcb);
13495                         hold_tcblock = 1;
13496                 }
13497                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13498                     TAILQ_EMPTY(&asoc->sent_queue) &&
13499                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13500                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13501                                 goto abort_anyway;
13502                         }
13503                         /* there is nothing queued to send, so I'm done... */
13504                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13505                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13506                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13507                                 struct sctp_nets *netp;
13508
13509                                 /* only send SHUTDOWN the first time through */
13510                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13511                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13512                                 }
13513                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13514                                 sctp_stop_timers_for_shutdown(stcb);
13515                                 if (stcb->asoc.alternate) {
13516                                         netp = stcb->asoc.alternate;
13517                                 } else {
13518                                         netp = stcb->asoc.primary_destination;
13519                                 }
13520                                 sctp_send_shutdown(stcb, netp);
13521                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13522                                     netp);
13523                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13524                                     asoc->primary_destination);
13525                         }
13526                 } else {
13527                         /*-
13528                          * we still got (or just got) data to send, so set
13529                          * SHUTDOWN_PENDING
13530                          */
13531                         /*-
13532                          * XXX sockets draft says that SCTP_EOF should be
13533                          * sent with no data.  currently, we will allow user
13534                          * data to be sent first and move to
13535                          * SHUTDOWN-PENDING
13536                          */
13537                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13538                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13539                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13540                                 if (hold_tcblock == 0) {
13541                                         SCTP_TCB_LOCK(stcb);
13542                                         hold_tcblock = 1;
13543                                 }
13544                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13545                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13546                                 }
13547                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13548                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13549                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13550                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13551                                         struct mbuf *op_err;
13552                                         char msg[SCTP_DIAG_INFO_LEN];
13553
13554                         abort_anyway:
13555                                         if (free_cnt_applied) {
13556                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13557                                                 free_cnt_applied = 0;
13558                                         }
13559                                         snprintf(msg, sizeof(msg),
13560                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13561                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13562                                             msg);
13563                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13564                                             op_err, SCTP_SO_LOCKED);
13565                                         /*
13566                                          * now relock the stcb so everything
13567                                          * is sane
13568                                          */
13569                                         hold_tcblock = 0;
13570                                         stcb = NULL;
13571                                         goto out;
13572                                 }
13573                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13574                                     asoc->primary_destination);
13575                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13576                         }
13577                 }
13578         }
13579 skip_out_eof:
13580         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13581                 some_on_control = 1;
13582         }
13583         if (queue_only_for_init) {
13584                 if (hold_tcblock == 0) {
13585                         SCTP_TCB_LOCK(stcb);
13586                         hold_tcblock = 1;
13587                 }
13588                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13589                         /* a collision took us forward? */
13590                         queue_only = 0;
13591                 } else {
13592                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13593                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13594                         queue_only = 1;
13595                 }
13596         }
13597         if ((net->flight_size > net->cwnd) &&
13598             (stcb->asoc.sctp_cmt_on_off == 0)) {
13599                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13600                 queue_only = 1;
13601         } else if (asoc->ifp_had_enobuf) {
13602                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13603                 if (net->flight_size > (2 * net->mtu)) {
13604                         queue_only = 1;
13605                 }
13606                 asoc->ifp_had_enobuf = 0;
13607         }
13608         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13609         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13610             (stcb->asoc.total_flight > 0) &&
13611             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13612             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13613                 /*-
13614                  * Ok, Nagle is set on and we have data outstanding.
13615                  * Don't send anything and let SACKs drive out the
13616                  * data unless wen have a "full" segment to send.
13617                  */
13618                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13619                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13620                 }
13621                 SCTP_STAT_INCR(sctps_naglequeued);
13622                 nagle_applies = 1;
13623         } else {
13624                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13625                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13626                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13627                 }
13628                 SCTP_STAT_INCR(sctps_naglesent);
13629                 nagle_applies = 0;
13630         }
13631         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13632                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13633                     nagle_applies, un_sent);
13634                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13635                     stcb->asoc.total_flight,
13636                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13637         }
13638         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13639                 /* we can attempt to send too. */
13640                 if (hold_tcblock == 0) {
13641                         /*
13642                          * If there is activity recv'ing sacks no need to
13643                          * send
13644                          */
13645                         if (SCTP_TCB_TRYLOCK(stcb)) {
13646                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13647                                 hold_tcblock = 1;
13648                         }
13649                 } else {
13650                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13651                 }
13652         } else if ((queue_only == 0) &&
13653                     (stcb->asoc.peers_rwnd == 0) &&
13654             (stcb->asoc.total_flight == 0)) {
13655                 /* We get to have a probe outstanding */
13656                 if (hold_tcblock == 0) {
13657                         hold_tcblock = 1;
13658                         SCTP_TCB_LOCK(stcb);
13659                 }
13660                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13661         } else if (some_on_control) {
13662                 int num_out, reason, frag_point;
13663
13664                 /* Here we do control only */
13665                 if (hold_tcblock == 0) {
13666                         hold_tcblock = 1;
13667                         SCTP_TCB_LOCK(stcb);
13668                 }
13669                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13670                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13671                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13672         }
13673         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13674             queue_only, stcb->asoc.peers_rwnd, un_sent,
13675             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13676             stcb->asoc.total_output_queue_size, error);
13677
13678 out:
13679 out_unlocked:
13680
13681         if (local_soresv && stcb) {
13682                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13683         }
13684         if (create_lock_applied) {
13685                 SCTP_ASOC_CREATE_UNLOCK(inp);
13686         }
13687         if ((stcb) && hold_tcblock) {
13688                 SCTP_TCB_UNLOCK(stcb);
13689         }
13690         if (stcb && free_cnt_applied) {
13691                 atomic_add_int(&stcb->asoc.refcnt, -1);
13692         }
13693 #ifdef INVARIANTS
13694         if (stcb) {
13695                 if (mtx_owned(&stcb->tcb_mtx)) {
13696                         panic("Leaving with tcb mtx owned?");
13697                 }
13698                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13699                         panic("Leaving with tcb send mtx owned?");
13700                 }
13701         }
13702 #endif
13703         if (top) {
13704                 sctp_m_freem(top);
13705         }
13706         if (control) {
13707                 sctp_m_freem(control);
13708         }
13709         return (error);
13710 }
13711
13712
13713 /*
13714  * generate an AUTHentication chunk, if required
13715  */
13716 struct mbuf *
13717 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13718     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13719     struct sctp_tcb *stcb, uint8_t chunk)
13720 {
13721         struct mbuf *m_auth;
13722         struct sctp_auth_chunk *auth;
13723         int chunk_len;
13724         struct mbuf *cn;
13725
13726         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13727             (stcb == NULL))
13728                 return (m);
13729
13730         if (stcb->asoc.auth_supported == 0) {
13731                 return (m);
13732         }
13733         /* does the requested chunk require auth? */
13734         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13735                 return (m);
13736         }
13737         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13738         if (m_auth == NULL) {
13739                 /* no mbuf's */
13740                 return (m);
13741         }
13742         /* reserve some space if this will be the first mbuf */
13743         if (m == NULL)
13744                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13745         /* fill in the AUTH chunk details */
13746         auth = mtod(m_auth, struct sctp_auth_chunk *);
13747         memset(auth, 0, sizeof(*auth));
13748         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13749         auth->ch.chunk_flags = 0;
13750         chunk_len = sizeof(*auth) +
13751             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13752         auth->ch.chunk_length = htons(chunk_len);
13753         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13754         /* key id and hmac digest will be computed and filled in upon send */
13755
13756         /* save the offset where the auth was inserted into the chain */
13757         *offset = 0;
13758         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13759                 *offset += SCTP_BUF_LEN(cn);
13760         }
13761
13762         /* update length and return pointer to the auth chunk */
13763         SCTP_BUF_LEN(m_auth) = chunk_len;
13764         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13765         if (auth_ret != NULL)
13766                 *auth_ret = auth;
13767
13768         return (m);
13769 }
13770
13771 #ifdef INET6
13772 int
13773 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13774 {
13775         struct nd_prefix *pfx = NULL;
13776         struct nd_pfxrouter *pfxrtr = NULL;
13777         struct sockaddr_in6 gw6;
13778
13779         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13780                 return (0);
13781
13782         /* get prefix entry of address */
13783         ND6_RLOCK();
13784         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13785                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13786                         continue;
13787                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13788                     &src6->sin6_addr, &pfx->ndpr_mask))
13789                         break;
13790         }
13791         /* no prefix entry in the prefix list */
13792         if (pfx == NULL) {
13793                 ND6_RUNLOCK();
13794                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13795                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13796                 return (0);
13797         }
13798
13799         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13800         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13801
13802         /* search installed gateway from prefix entry */
13803         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13804                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13805                 gw6.sin6_family = AF_INET6;
13806                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13807                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13808                     sizeof(struct in6_addr));
13809                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13810                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13811                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13812                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13813                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13814                         ND6_RUNLOCK();
13815                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13816                         return (1);
13817                 }
13818         }
13819         ND6_RUNLOCK();
13820         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13821         return (0);
13822 }
13823 #endif
13824
13825 int
13826 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13827 {
13828 #ifdef INET
13829         struct sockaddr_in *sin, *mask;
13830         struct ifaddr *ifa;
13831         struct in_addr srcnetaddr, gwnetaddr;
13832
13833         if (ro == NULL || ro->ro_rt == NULL ||
13834             sifa->address.sa.sa_family != AF_INET) {
13835                 return (0);
13836         }
13837         ifa = (struct ifaddr *)sifa->ifa;
13838         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13839         sin = &sifa->address.sin;
13840         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13841         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13842         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13843         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13844
13845         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13846         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13847         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13848         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13849         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13850         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13851                 return (1);
13852         }
13853 #endif
13854         return (0);
13855 }