sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #if defined(INET) || defined(INET6)
  56 #include <netinet/udp.h>
  57 #endif
  58 #include <netinet/udp_var.h>
  59 #include <machine/in_cksum.h>
  60 #include <netinet/in_kdtrace.h>
  61
  62
  63
  64 #define SCTP_MAX_GAPS_INARRAY 4
  65 struct sack_track {
  66         uint8_t right_edge;     /* mergable on the right edge */
  67         uint8_t left_edge;      /* mergable on the left edge */
  68         uint8_t num_entries;
  69         uint8_t spare;
  70         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  71 };
  72
  73 const struct sack_track sack_array[256] = {
  74         {0, 0, 0, 0,            /* 0x00 */
  75                 {{0, 0},
  76                 {0, 0},
  77                 {0, 0},
  78                 {0, 0}
  79                 }
  80         },
  81         {1, 0, 1, 0,            /* 0x01 */
  82                 {{0, 0},
  83                 {0, 0},
  84                 {0, 0},
  85                 {0, 0}
  86                 }
  87         },
  88         {0, 0, 1, 0,            /* 0x02 */
  89                 {{1, 1},
  90                 {0, 0},
  91                 {0, 0},
  92                 {0, 0}
  93                 }
  94         },
  95         {1, 0, 1, 0,            /* 0x03 */
  96                 {{0, 1},
  97                 {0, 0},
  98                 {0, 0},
  99                 {0, 0}
 100                 }
 101         },
 102         {0, 0, 1, 0,            /* 0x04 */
 103                 {{2, 2},
 104                 {0, 0},
 105                 {0, 0},
 106                 {0, 0}
 107                 }
 108         },
 109         {1, 0, 2, 0,            /* 0x05 */
 110                 {{0, 0},
 111                 {2, 2},
 112                 {0, 0},
 113                 {0, 0}
 114                 }
 115         },
 116         {0, 0, 1, 0,            /* 0x06 */
 117                 {{1, 2},
 118                 {0, 0},
 119                 {0, 0},
 120                 {0, 0}
 121                 }
 122         },
 123         {1, 0, 1, 0,            /* 0x07 */
 124                 {{0, 2},
 125                 {0, 0},
 126                 {0, 0},
 127                 {0, 0}
 128                 }
 129         },
 130         {0, 0, 1, 0,            /* 0x08 */
 131                 {{3, 3},
 132                 {0, 0},
 133                 {0, 0},
 134                 {0, 0}
 135                 }
 136         },
 137         {1, 0, 2, 0,            /* 0x09 */
 138                 {{0, 0},
 139                 {3, 3},
 140                 {0, 0},
 141                 {0, 0}
 142                 }
 143         },
 144         {0, 0, 2, 0,            /* 0x0a */
 145                 {{1, 1},
 146                 {3, 3},
 147                 {0, 0},
 148                 {0, 0}
 149                 }
 150         },
 151         {1, 0, 2, 0,            /* 0x0b */
 152                 {{0, 1},
 153                 {3, 3},
 154                 {0, 0},
 155                 {0, 0}
 156                 }
 157         },
 158         {0, 0, 1, 0,            /* 0x0c */
 159                 {{2, 3},
 160                 {0, 0},
 161                 {0, 0},
 162                 {0, 0}
 163                 }
 164         },
 165         {1, 0, 2, 0,            /* 0x0d */
 166                 {{0, 0},
 167                 {2, 3},
 168                 {0, 0},
 169                 {0, 0}
 170                 }
 171         },
 172         {0, 0, 1, 0,            /* 0x0e */
 173                 {{1, 3},
 174                 {0, 0},
 175                 {0, 0},
 176                 {0, 0}
 177                 }
 178         },
 179         {1, 0, 1, 0,            /* 0x0f */
 180                 {{0, 3},
 181                 {0, 0},
 182                 {0, 0},
 183                 {0, 0}
 184                 }
 185         },
 186         {0, 0, 1, 0,            /* 0x10 */
 187                 {{4, 4},
 188                 {0, 0},
 189                 {0, 0},
 190                 {0, 0}
 191                 }
 192         },
 193         {1, 0, 2, 0,            /* 0x11 */
 194                 {{0, 0},
 195                 {4, 4},
 196                 {0, 0},
 197                 {0, 0}
 198                 }
 199         },
 200         {0, 0, 2, 0,            /* 0x12 */
 201                 {{1, 1},
 202                 {4, 4},
 203                 {0, 0},
 204                 {0, 0}
 205                 }
 206         },
 207         {1, 0, 2, 0,            /* 0x13 */
 208                 {{0, 1},
 209                 {4, 4},
 210                 {0, 0},
 211                 {0, 0}
 212                 }
 213         },
 214         {0, 0, 2, 0,            /* 0x14 */
 215                 {{2, 2},
 216                 {4, 4},
 217                 {0, 0},
 218                 {0, 0}
 219                 }
 220         },
 221         {1, 0, 3, 0,            /* 0x15 */
 222                 {{0, 0},
 223                 {2, 2},
 224                 {4, 4},
 225                 {0, 0}
 226                 }
 227         },
 228         {0, 0, 2, 0,            /* 0x16 */
 229                 {{1, 2},
 230                 {4, 4},
 231                 {0, 0},
 232                 {0, 0}
 233                 }
 234         },
 235         {1, 0, 2, 0,            /* 0x17 */
 236                 {{0, 2},
 237                 {4, 4},
 238                 {0, 0},
 239                 {0, 0}
 240                 }
 241         },
 242         {0, 0, 1, 0,            /* 0x18 */
 243                 {{3, 4},
 244                 {0, 0},
 245                 {0, 0},
 246                 {0, 0}
 247                 }
 248         },
 249         {1, 0, 2, 0,            /* 0x19 */
 250                 {{0, 0},
 251                 {3, 4},
 252                 {0, 0},
 253                 {0, 0}
 254                 }
 255         },
 256         {0, 0, 2, 0,            /* 0x1a */
 257                 {{1, 1},
 258                 {3, 4},
 259                 {0, 0},
 260                 {0, 0}
 261                 }
 262         },
 263         {1, 0, 2, 0,            /* 0x1b */
 264                 {{0, 1},
 265                 {3, 4},
 266                 {0, 0},
 267                 {0, 0}
 268                 }
 269         },
 270         {0, 0, 1, 0,            /* 0x1c */
 271                 {{2, 4},
 272                 {0, 0},
 273                 {0, 0},
 274                 {0, 0}
 275                 }
 276         },
 277         {1, 0, 2, 0,            /* 0x1d */
 278                 {{0, 0},
 279                 {2, 4},
 280                 {0, 0},
 281                 {0, 0}
 282                 }
 283         },
 284         {0, 0, 1, 0,            /* 0x1e */
 285                 {{1, 4},
 286                 {0, 0},
 287                 {0, 0},
 288                 {0, 0}
 289                 }
 290         },
 291         {1, 0, 1, 0,            /* 0x1f */
 292                 {{0, 4},
 293                 {0, 0},
 294                 {0, 0},
 295                 {0, 0}
 296                 }
 297         },
 298         {0, 0, 1, 0,            /* 0x20 */
 299                 {{5, 5},
 300                 {0, 0},
 301                 {0, 0},
 302                 {0, 0}
 303                 }
 304         },
 305         {1, 0, 2, 0,            /* 0x21 */
 306                 {{0, 0},
 307                 {5, 5},
 308                 {0, 0},
 309                 {0, 0}
 310                 }
 311         },
 312         {0, 0, 2, 0,            /* 0x22 */
 313                 {{1, 1},
 314                 {5, 5},
 315                 {0, 0},
 316                 {0, 0}
 317                 }
 318         },
 319         {1, 0, 2, 0,            /* 0x23 */
 320                 {{0, 1},
 321                 {5, 5},
 322                 {0, 0},
 323                 {0, 0}
 324                 }
 325         },
 326         {0, 0, 2, 0,            /* 0x24 */
 327                 {{2, 2},
 328                 {5, 5},
 329                 {0, 0},
 330                 {0, 0}
 331                 }
 332         },
 333         {1, 0, 3, 0,            /* 0x25 */
 334                 {{0, 0},
 335                 {2, 2},
 336                 {5, 5},
 337                 {0, 0}
 338                 }
 339         },
 340         {0, 0, 2, 0,            /* 0x26 */
 341                 {{1, 2},
 342                 {5, 5},
 343                 {0, 0},
 344                 {0, 0}
 345                 }
 346         },
 347         {1, 0, 2, 0,            /* 0x27 */
 348                 {{0, 2},
 349                 {5, 5},
 350                 {0, 0},
 351                 {0, 0}
 352                 }
 353         },
 354         {0, 0, 2, 0,            /* 0x28 */
 355                 {{3, 3},
 356                 {5, 5},
 357                 {0, 0},
 358                 {0, 0}
 359                 }
 360         },
 361         {1, 0, 3, 0,            /* 0x29 */
 362                 {{0, 0},
 363                 {3, 3},
 364                 {5, 5},
 365                 {0, 0}
 366                 }
 367         },
 368         {0, 0, 3, 0,            /* 0x2a */
 369                 {{1, 1},
 370                 {3, 3},
 371                 {5, 5},
 372                 {0, 0}
 373                 }
 374         },
 375         {1, 0, 3, 0,            /* 0x2b */
 376                 {{0, 1},
 377                 {3, 3},
 378                 {5, 5},
 379                 {0, 0}
 380                 }
 381         },
 382         {0, 0, 2, 0,            /* 0x2c */
 383                 {{2, 3},
 384                 {5, 5},
 385                 {0, 0},
 386                 {0, 0}
 387                 }
 388         },
 389         {1, 0, 3, 0,            /* 0x2d */
 390                 {{0, 0},
 391                 {2, 3},
 392                 {5, 5},
 393                 {0, 0}
 394                 }
 395         },
 396         {0, 0, 2, 0,            /* 0x2e */
 397                 {{1, 3},
 398                 {5, 5},
 399                 {0, 0},
 400                 {0, 0}
 401                 }
 402         },
 403         {1, 0, 2, 0,            /* 0x2f */
 404                 {{0, 3},
 405                 {5, 5},
 406                 {0, 0},
 407                 {0, 0}
 408                 }
 409         },
 410         {0, 0, 1, 0,            /* 0x30 */
 411                 {{4, 5},
 412                 {0, 0},
 413                 {0, 0},
 414                 {0, 0}
 415                 }
 416         },
 417         {1, 0, 2, 0,            /* 0x31 */
 418                 {{0, 0},
 419                 {4, 5},
 420                 {0, 0},
 421                 {0, 0}
 422                 }
 423         },
 424         {0, 0, 2, 0,            /* 0x32 */
 425                 {{1, 1},
 426                 {4, 5},
 427                 {0, 0},
 428                 {0, 0}
 429                 }
 430         },
 431         {1, 0, 2, 0,            /* 0x33 */
 432                 {{0, 1},
 433                 {4, 5},
 434                 {0, 0},
 435                 {0, 0}
 436                 }
 437         },
 438         {0, 0, 2, 0,            /* 0x34 */
 439                 {{2, 2},
 440                 {4, 5},
 441                 {0, 0},
 442                 {0, 0}
 443                 }
 444         },
 445         {1, 0, 3, 0,            /* 0x35 */
 446                 {{0, 0},
 447                 {2, 2},
 448                 {4, 5},
 449                 {0, 0}
 450                 }
 451         },
 452         {0, 0, 2, 0,            /* 0x36 */
 453                 {{1, 2},
 454                 {4, 5},
 455                 {0, 0},
 456                 {0, 0}
 457                 }
 458         },
 459         {1, 0, 2, 0,            /* 0x37 */
 460                 {{0, 2},
 461                 {4, 5},
 462                 {0, 0},
 463                 {0, 0}
 464                 }
 465         },
 466         {0, 0, 1, 0,            /* 0x38 */
 467                 {{3, 5},
 468                 {0, 0},
 469                 {0, 0},
 470                 {0, 0}
 471                 }
 472         },
 473         {1, 0, 2, 0,            /* 0x39 */
 474                 {{0, 0},
 475                 {3, 5},
 476                 {0, 0},
 477                 {0, 0}
 478                 }
 479         },
 480         {0, 0, 2, 0,            /* 0x3a */
 481                 {{1, 1},
 482                 {3, 5},
 483                 {0, 0},
 484                 {0, 0}
 485                 }
 486         },
 487         {1, 0, 2, 0,            /* 0x3b */
 488                 {{0, 1},
 489                 {3, 5},
 490                 {0, 0},
 491                 {0, 0}
 492                 }
 493         },
 494         {0, 0, 1, 0,            /* 0x3c */
 495                 {{2, 5},
 496                 {0, 0},
 497                 {0, 0},
 498                 {0, 0}
 499                 }
 500         },
 501         {1, 0, 2, 0,            /* 0x3d */
 502                 {{0, 0},
 503                 {2, 5},
 504                 {0, 0},
 505                 {0, 0}
 506                 }
 507         },
 508         {0, 0, 1, 0,            /* 0x3e */
 509                 {{1, 5},
 510                 {0, 0},
 511                 {0, 0},
 512                 {0, 0}
 513                 }
 514         },
 515         {1, 0, 1, 0,            /* 0x3f */
 516                 {{0, 5},
 517                 {0, 0},
 518                 {0, 0},
 519                 {0, 0}
 520                 }
 521         },
 522         {0, 0, 1, 0,            /* 0x40 */
 523                 {{6, 6},
 524                 {0, 0},
 525                 {0, 0},
 526                 {0, 0}
 527                 }
 528         },
 529         {1, 0, 2, 0,            /* 0x41 */
 530                 {{0, 0},
 531                 {6, 6},
 532                 {0, 0},
 533                 {0, 0}
 534                 }
 535         },
 536         {0, 0, 2, 0,            /* 0x42 */
 537                 {{1, 1},
 538                 {6, 6},
 539                 {0, 0},
 540                 {0, 0}
 541                 }
 542         },
 543         {1, 0, 2, 0,            /* 0x43 */
 544                 {{0, 1},
 545                 {6, 6},
 546                 {0, 0},
 547                 {0, 0}
 548                 }
 549         },
 550         {0, 0, 2, 0,            /* 0x44 */
 551                 {{2, 2},
 552                 {6, 6},
 553                 {0, 0},
 554                 {0, 0}
 555                 }
 556         },
 557         {1, 0, 3, 0,            /* 0x45 */
 558                 {{0, 0},
 559                 {2, 2},
 560                 {6, 6},
 561                 {0, 0}
 562                 }
 563         },
 564         {0, 0, 2, 0,            /* 0x46 */
 565                 {{1, 2},
 566                 {6, 6},
 567                 {0, 0},
 568                 {0, 0}
 569                 }
 570         },
 571         {1, 0, 2, 0,            /* 0x47 */
 572                 {{0, 2},
 573                 {6, 6},
 574                 {0, 0},
 575                 {0, 0}
 576                 }
 577         },
 578         {0, 0, 2, 0,            /* 0x48 */
 579                 {{3, 3},
 580                 {6, 6},
 581                 {0, 0},
 582                 {0, 0}
 583                 }
 584         },
 585         {1, 0, 3, 0,            /* 0x49 */
 586                 {{0, 0},
 587                 {3, 3},
 588                 {6, 6},
 589                 {0, 0}
 590                 }
 591         },
 592         {0, 0, 3, 0,            /* 0x4a */
 593                 {{1, 1},
 594                 {3, 3},
 595                 {6, 6},
 596                 {0, 0}
 597                 }
 598         },
 599         {1, 0, 3, 0,            /* 0x4b */
 600                 {{0, 1},
 601                 {3, 3},
 602                 {6, 6},
 603                 {0, 0}
 604                 }
 605         },
 606         {0, 0, 2, 0,            /* 0x4c */
 607                 {{2, 3},
 608                 {6, 6},
 609                 {0, 0},
 610                 {0, 0}
 611                 }
 612         },
 613         {1, 0, 3, 0,            /* 0x4d */
 614                 {{0, 0},
 615                 {2, 3},
 616                 {6, 6},
 617                 {0, 0}
 618                 }
 619         },
 620         {0, 0, 2, 0,            /* 0x4e */
 621                 {{1, 3},
 622                 {6, 6},
 623                 {0, 0},
 624                 {0, 0}
 625                 }
 626         },
 627         {1, 0, 2, 0,            /* 0x4f */
 628                 {{0, 3},
 629                 {6, 6},
 630                 {0, 0},
 631                 {0, 0}
 632                 }
 633         },
 634         {0, 0, 2, 0,            /* 0x50 */
 635                 {{4, 4},
 636                 {6, 6},
 637                 {0, 0},
 638                 {0, 0}
 639                 }
 640         },
 641         {1, 0, 3, 0,            /* 0x51 */
 642                 {{0, 0},
 643                 {4, 4},
 644                 {6, 6},
 645                 {0, 0}
 646                 }
 647         },
 648         {0, 0, 3, 0,            /* 0x52 */
 649                 {{1, 1},
 650                 {4, 4},
 651                 {6, 6},
 652                 {0, 0}
 653                 }
 654         },
 655         {1, 0, 3, 0,            /* 0x53 */
 656                 {{0, 1},
 657                 {4, 4},
 658                 {6, 6},
 659                 {0, 0}
 660                 }
 661         },
 662         {0, 0, 3, 0,            /* 0x54 */
 663                 {{2, 2},
 664                 {4, 4},
 665                 {6, 6},
 666                 {0, 0}
 667                 }
 668         },
 669         {1, 0, 4, 0,            /* 0x55 */
 670                 {{0, 0},
 671                 {2, 2},
 672                 {4, 4},
 673                 {6, 6}
 674                 }
 675         },
 676         {0, 0, 3, 0,            /* 0x56 */
 677                 {{1, 2},
 678                 {4, 4},
 679                 {6, 6},
 680                 {0, 0}
 681                 }
 682         },
 683         {1, 0, 3, 0,            /* 0x57 */
 684                 {{0, 2},
 685                 {4, 4},
 686                 {6, 6},
 687                 {0, 0}
 688                 }
 689         },
 690         {0, 0, 2, 0,            /* 0x58 */
 691                 {{3, 4},
 692                 {6, 6},
 693                 {0, 0},
 694                 {0, 0}
 695                 }
 696         },
 697         {1, 0, 3, 0,            /* 0x59 */
 698                 {{0, 0},
 699                 {3, 4},
 700                 {6, 6},
 701                 {0, 0}
 702                 }
 703         },
 704         {0, 0, 3, 0,            /* 0x5a */
 705                 {{1, 1},
 706                 {3, 4},
 707                 {6, 6},
 708                 {0, 0}
 709                 }
 710         },
 711         {1, 0, 3, 0,            /* 0x5b */
 712                 {{0, 1},
 713                 {3, 4},
 714                 {6, 6},
 715                 {0, 0}
 716                 }
 717         },
 718         {0, 0, 2, 0,            /* 0x5c */
 719                 {{2, 4},
 720                 {6, 6},
 721                 {0, 0},
 722                 {0, 0}
 723                 }
 724         },
 725         {1, 0, 3, 0,            /* 0x5d */
 726                 {{0, 0},
 727                 {2, 4},
 728                 {6, 6},
 729                 {0, 0}
 730                 }
 731         },
 732         {0, 0, 2, 0,            /* 0x5e */
 733                 {{1, 4},
 734                 {6, 6},
 735                 {0, 0},
 736                 {0, 0}
 737                 }
 738         },
 739         {1, 0, 2, 0,            /* 0x5f */
 740                 {{0, 4},
 741                 {6, 6},
 742                 {0, 0},
 743                 {0, 0}
 744                 }
 745         },
 746         {0, 0, 1, 0,            /* 0x60 */
 747                 {{5, 6},
 748                 {0, 0},
 749                 {0, 0},
 750                 {0, 0}
 751                 }
 752         },
 753         {1, 0, 2, 0,            /* 0x61 */
 754                 {{0, 0},
 755                 {5, 6},
 756                 {0, 0},
 757                 {0, 0}
 758                 }
 759         },
 760         {0, 0, 2, 0,            /* 0x62 */
 761                 {{1, 1},
 762                 {5, 6},
 763                 {0, 0},
 764                 {0, 0}
 765                 }
 766         },
 767         {1, 0, 2, 0,            /* 0x63 */
 768                 {{0, 1},
 769                 {5, 6},
 770                 {0, 0},
 771                 {0, 0}
 772                 }
 773         },
 774         {0, 0, 2, 0,            /* 0x64 */
 775                 {{2, 2},
 776                 {5, 6},
 777                 {0, 0},
 778                 {0, 0}
 779                 }
 780         },
 781         {1, 0, 3, 0,            /* 0x65 */
 782                 {{0, 0},
 783                 {2, 2},
 784                 {5, 6},
 785                 {0, 0}
 786                 }
 787         },
 788         {0, 0, 2, 0,            /* 0x66 */
 789                 {{1, 2},
 790                 {5, 6},
 791                 {0, 0},
 792                 {0, 0}
 793                 }
 794         },
 795         {1, 0, 2, 0,            /* 0x67 */
 796                 {{0, 2},
 797                 {5, 6},
 798                 {0, 0},
 799                 {0, 0}
 800                 }
 801         },
 802         {0, 0, 2, 0,            /* 0x68 */
 803                 {{3, 3},
 804                 {5, 6},
 805                 {0, 0},
 806                 {0, 0}
 807                 }
 808         },
 809         {1, 0, 3, 0,            /* 0x69 */
 810                 {{0, 0},
 811                 {3, 3},
 812                 {5, 6},
 813                 {0, 0}
 814                 }
 815         },
 816         {0, 0, 3, 0,            /* 0x6a */
 817                 {{1, 1},
 818                 {3, 3},
 819                 {5, 6},
 820                 {0, 0}
 821                 }
 822         },
 823         {1, 0, 3, 0,            /* 0x6b */
 824                 {{0, 1},
 825                 {3, 3},
 826                 {5, 6},
 827                 {0, 0}
 828                 }
 829         },
 830         {0, 0, 2, 0,            /* 0x6c */
 831                 {{2, 3},
 832                 {5, 6},
 833                 {0, 0},
 834                 {0, 0}
 835                 }
 836         },
 837         {1, 0, 3, 0,            /* 0x6d */
 838                 {{0, 0},
 839                 {2, 3},
 840                 {5, 6},
 841                 {0, 0}
 842                 }
 843         },
 844         {0, 0, 2, 0,            /* 0x6e */
 845                 {{1, 3},
 846                 {5, 6},
 847                 {0, 0},
 848                 {0, 0}
 849                 }
 850         },
 851         {1, 0, 2, 0,            /* 0x6f */
 852                 {{0, 3},
 853                 {5, 6},
 854                 {0, 0},
 855                 {0, 0}
 856                 }
 857         },
 858         {0, 0, 1, 0,            /* 0x70 */
 859                 {{4, 6},
 860                 {0, 0},
 861                 {0, 0},
 862                 {0, 0}
 863                 }
 864         },
 865         {1, 0, 2, 0,            /* 0x71 */
 866                 {{0, 0},
 867                 {4, 6},
 868                 {0, 0},
 869                 {0, 0}
 870                 }
 871         },
 872         {0, 0, 2, 0,            /* 0x72 */
 873                 {{1, 1},
 874                 {4, 6},
 875                 {0, 0},
 876                 {0, 0}
 877                 }
 878         },
 879         {1, 0, 2, 0,            /* 0x73 */
 880                 {{0, 1},
 881                 {4, 6},
 882                 {0, 0},
 883                 {0, 0}
 884                 }
 885         },
 886         {0, 0, 2, 0,            /* 0x74 */
 887                 {{2, 2},
 888                 {4, 6},
 889                 {0, 0},
 890                 {0, 0}
 891                 }
 892         },
 893         {1, 0, 3, 0,            /* 0x75 */
 894                 {{0, 0},
 895                 {2, 2},
 896                 {4, 6},
 897                 {0, 0}
 898                 }
 899         },
 900         {0, 0, 2, 0,            /* 0x76 */
 901                 {{1, 2},
 902                 {4, 6},
 903                 {0, 0},
 904                 {0, 0}
 905                 }
 906         },
 907         {1, 0, 2, 0,            /* 0x77 */
 908                 {{0, 2},
 909                 {4, 6},
 910                 {0, 0},
 911                 {0, 0}
 912                 }
 913         },
 914         {0, 0, 1, 0,            /* 0x78 */
 915                 {{3, 6},
 916                 {0, 0},
 917                 {0, 0},
 918                 {0, 0}
 919                 }
 920         },
 921         {1, 0, 2, 0,            /* 0x79 */
 922                 {{0, 0},
 923                 {3, 6},
 924                 {0, 0},
 925                 {0, 0}
 926                 }
 927         },
 928         {0, 0, 2, 0,            /* 0x7a */
 929                 {{1, 1},
 930                 {3, 6},
 931                 {0, 0},
 932                 {0, 0}
 933                 }
 934         },
 935         {1, 0, 2, 0,            /* 0x7b */
 936                 {{0, 1},
 937                 {3, 6},
 938                 {0, 0},
 939                 {0, 0}
 940                 }
 941         },
 942         {0, 0, 1, 0,            /* 0x7c */
 943                 {{2, 6},
 944                 {0, 0},
 945                 {0, 0},
 946                 {0, 0}
 947                 }
 948         },
 949         {1, 0, 2, 0,            /* 0x7d */
 950                 {{0, 0},
 951                 {2, 6},
 952                 {0, 0},
 953                 {0, 0}
 954                 }
 955         },
 956         {0, 0, 1, 0,            /* 0x7e */
 957                 {{1, 6},
 958                 {0, 0},
 959                 {0, 0},
 960                 {0, 0}
 961                 }
 962         },
 963         {1, 0, 1, 0,            /* 0x7f */
 964                 {{0, 6},
 965                 {0, 0},
 966                 {0, 0},
 967                 {0, 0}
 968                 }
 969         },
 970         {0, 1, 1, 0,            /* 0x80 */
 971                 {{7, 7},
 972                 {0, 0},
 973                 {0, 0},
 974                 {0, 0}
 975                 }
 976         },
 977         {1, 1, 2, 0,            /* 0x81 */
 978                 {{0, 0},
 979                 {7, 7},
 980                 {0, 0},
 981                 {0, 0}
 982                 }
 983         },
 984         {0, 1, 2, 0,            /* 0x82 */
 985                 {{1, 1},
 986                 {7, 7},
 987                 {0, 0},
 988                 {0, 0}
 989                 }
 990         },
 991         {1, 1, 2, 0,            /* 0x83 */
 992                 {{0, 1},
 993                 {7, 7},
 994                 {0, 0},
 995                 {0, 0}
 996                 }
 997         },
 998         {0, 1, 2, 0,            /* 0x84 */
 999                 {{2, 2},
1000                 {7, 7},
1001                 {0, 0},
1002                 {0, 0}
1003                 }
1004         },
1005         {1, 1, 3, 0,            /* 0x85 */
1006                 {{0, 0},
1007                 {2, 2},
1008                 {7, 7},
1009                 {0, 0}
1010                 }
1011         },
1012         {0, 1, 2, 0,            /* 0x86 */
1013                 {{1, 2},
1014                 {7, 7},
1015                 {0, 0},
1016                 {0, 0}
1017                 }
1018         },
1019         {1, 1, 2, 0,            /* 0x87 */
1020                 {{0, 2},
1021                 {7, 7},
1022                 {0, 0},
1023                 {0, 0}
1024                 }
1025         },
1026         {0, 1, 2, 0,            /* 0x88 */
1027                 {{3, 3},
1028                 {7, 7},
1029                 {0, 0},
1030                 {0, 0}
1031                 }
1032         },
1033         {1, 1, 3, 0,            /* 0x89 */
1034                 {{0, 0},
1035                 {3, 3},
1036                 {7, 7},
1037                 {0, 0}
1038                 }
1039         },
1040         {0, 1, 3, 0,            /* 0x8a */
1041                 {{1, 1},
1042                 {3, 3},
1043                 {7, 7},
1044                 {0, 0}
1045                 }
1046         },
1047         {1, 1, 3, 0,            /* 0x8b */
1048                 {{0, 1},
1049                 {3, 3},
1050                 {7, 7},
1051                 {0, 0}
1052                 }
1053         },
1054         {0, 1, 2, 0,            /* 0x8c */
1055                 {{2, 3},
1056                 {7, 7},
1057                 {0, 0},
1058                 {0, 0}
1059                 }
1060         },
1061         {1, 1, 3, 0,            /* 0x8d */
1062                 {{0, 0},
1063                 {2, 3},
1064                 {7, 7},
1065                 {0, 0}
1066                 }
1067         },
1068         {0, 1, 2, 0,            /* 0x8e */
1069                 {{1, 3},
1070                 {7, 7},
1071                 {0, 0},
1072                 {0, 0}
1073                 }
1074         },
1075         {1, 1, 2, 0,            /* 0x8f */
1076                 {{0, 3},
1077                 {7, 7},
1078                 {0, 0},
1079                 {0, 0}
1080                 }
1081         },
1082         {0, 1, 2, 0,            /* 0x90 */
1083                 {{4, 4},
1084                 {7, 7},
1085                 {0, 0},
1086                 {0, 0}
1087                 }
1088         },
1089         {1, 1, 3, 0,            /* 0x91 */
1090                 {{0, 0},
1091                 {4, 4},
1092                 {7, 7},
1093                 {0, 0}
1094                 }
1095         },
1096         {0, 1, 3, 0,            /* 0x92 */
1097                 {{1, 1},
1098                 {4, 4},
1099                 {7, 7},
1100                 {0, 0}
1101                 }
1102         },
1103         {1, 1, 3, 0,            /* 0x93 */
1104                 {{0, 1},
1105                 {4, 4},
1106                 {7, 7},
1107                 {0, 0}
1108                 }
1109         },
1110         {0, 1, 3, 0,            /* 0x94 */
1111                 {{2, 2},
1112                 {4, 4},
1113                 {7, 7},
1114                 {0, 0}
1115                 }
1116         },
1117         {1, 1, 4, 0,            /* 0x95 */
1118                 {{0, 0},
1119                 {2, 2},
1120                 {4, 4},
1121                 {7, 7}
1122                 }
1123         },
1124         {0, 1, 3, 0,            /* 0x96 */
1125                 {{1, 2},
1126                 {4, 4},
1127                 {7, 7},
1128                 {0, 0}
1129                 }
1130         },
1131         {1, 1, 3, 0,            /* 0x97 */
1132                 {{0, 2},
1133                 {4, 4},
1134                 {7, 7},
1135                 {0, 0}
1136                 }
1137         },
1138         {0, 1, 2, 0,            /* 0x98 */
1139                 {{3, 4},
1140                 {7, 7},
1141                 {0, 0},
1142                 {0, 0}
1143                 }
1144         },
1145         {1, 1, 3, 0,            /* 0x99 */
1146                 {{0, 0},
1147                 {3, 4},
1148                 {7, 7},
1149                 {0, 0}
1150                 }
1151         },
1152         {0, 1, 3, 0,            /* 0x9a */
1153                 {{1, 1},
1154                 {3, 4},
1155                 {7, 7},
1156                 {0, 0}
1157                 }
1158         },
1159         {1, 1, 3, 0,            /* 0x9b */
1160                 {{0, 1},
1161                 {3, 4},
1162                 {7, 7},
1163                 {0, 0}
1164                 }
1165         },
1166         {0, 1, 2, 0,            /* 0x9c */
1167                 {{2, 4},
1168                 {7, 7},
1169                 {0, 0},
1170                 {0, 0}
1171                 }
1172         },
1173         {1, 1, 3, 0,            /* 0x9d */
1174                 {{0, 0},
1175                 {2, 4},
1176                 {7, 7},
1177                 {0, 0}
1178                 }
1179         },
1180         {0, 1, 2, 0,            /* 0x9e */
1181                 {{1, 4},
1182                 {7, 7},
1183                 {0, 0},
1184                 {0, 0}
1185                 }
1186         },
1187         {1, 1, 2, 0,            /* 0x9f */
1188                 {{0, 4},
1189                 {7, 7},
1190                 {0, 0},
1191                 {0, 0}
1192                 }
1193         },
1194         {0, 1, 2, 0,            /* 0xa0 */
1195                 {{5, 5},
1196                 {7, 7},
1197                 {0, 0},
1198                 {0, 0}
1199                 }
1200         },
1201         {1, 1, 3, 0,            /* 0xa1 */
1202                 {{0, 0},
1203                 {5, 5},
1204                 {7, 7},
1205                 {0, 0}
1206                 }
1207         },
1208         {0, 1, 3, 0,            /* 0xa2 */
1209                 {{1, 1},
1210                 {5, 5},
1211                 {7, 7},
1212                 {0, 0}
1213                 }
1214         },
1215         {1, 1, 3, 0,            /* 0xa3 */
1216                 {{0, 1},
1217                 {5, 5},
1218                 {7, 7},
1219                 {0, 0}
1220                 }
1221         },
1222         {0, 1, 3, 0,            /* 0xa4 */
1223                 {{2, 2},
1224                 {5, 5},
1225                 {7, 7},
1226                 {0, 0}
1227                 }
1228         },
1229         {1, 1, 4, 0,            /* 0xa5 */
1230                 {{0, 0},
1231                 {2, 2},
1232                 {5, 5},
1233                 {7, 7}
1234                 }
1235         },
1236         {0, 1, 3, 0,            /* 0xa6 */
1237                 {{1, 2},
1238                 {5, 5},
1239                 {7, 7},
1240                 {0, 0}
1241                 }
1242         },
1243         {1, 1, 3, 0,            /* 0xa7 */
1244                 {{0, 2},
1245                 {5, 5},
1246                 {7, 7},
1247                 {0, 0}
1248                 }
1249         },
1250         {0, 1, 3, 0,            /* 0xa8 */
1251                 {{3, 3},
1252                 {5, 5},
1253                 {7, 7},
1254                 {0, 0}
1255                 }
1256         },
1257         {1, 1, 4, 0,            /* 0xa9 */
1258                 {{0, 0},
1259                 {3, 3},
1260                 {5, 5},
1261                 {7, 7}
1262                 }
1263         },
1264         {0, 1, 4, 0,            /* 0xaa */
1265                 {{1, 1},
1266                 {3, 3},
1267                 {5, 5},
1268                 {7, 7}
1269                 }
1270         },
1271         {1, 1, 4, 0,            /* 0xab */
1272                 {{0, 1},
1273                 {3, 3},
1274                 {5, 5},
1275                 {7, 7}
1276                 }
1277         },
1278         {0, 1, 3, 0,            /* 0xac */
1279                 {{2, 3},
1280                 {5, 5},
1281                 {7, 7},
1282                 {0, 0}
1283                 }
1284         },
1285         {1, 1, 4, 0,            /* 0xad */
1286                 {{0, 0},
1287                 {2, 3},
1288                 {5, 5},
1289                 {7, 7}
1290                 }
1291         },
1292         {0, 1, 3, 0,            /* 0xae */
1293                 {{1, 3},
1294                 {5, 5},
1295                 {7, 7},
1296                 {0, 0}
1297                 }
1298         },
1299         {1, 1, 3, 0,            /* 0xaf */
1300                 {{0, 3},
1301                 {5, 5},
1302                 {7, 7},
1303                 {0, 0}
1304                 }
1305         },
1306         {0, 1, 2, 0,            /* 0xb0 */
1307                 {{4, 5},
1308                 {7, 7},
1309                 {0, 0},
1310                 {0, 0}
1311                 }
1312         },
1313         {1, 1, 3, 0,            /* 0xb1 */
1314                 {{0, 0},
1315                 {4, 5},
1316                 {7, 7},
1317                 {0, 0}
1318                 }
1319         },
1320         {0, 1, 3, 0,            /* 0xb2 */
1321                 {{1, 1},
1322                 {4, 5},
1323                 {7, 7},
1324                 {0, 0}
1325                 }
1326         },
1327         {1, 1, 3, 0,            /* 0xb3 */
1328                 {{0, 1},
1329                 {4, 5},
1330                 {7, 7},
1331                 {0, 0}
1332                 }
1333         },
1334         {0, 1, 3, 0,            /* 0xb4 */
1335                 {{2, 2},
1336                 {4, 5},
1337                 {7, 7},
1338                 {0, 0}
1339                 }
1340         },
1341         {1, 1, 4, 0,            /* 0xb5 */
1342                 {{0, 0},
1343                 {2, 2},
1344                 {4, 5},
1345                 {7, 7}
1346                 }
1347         },
1348         {0, 1, 3, 0,            /* 0xb6 */
1349                 {{1, 2},
1350                 {4, 5},
1351                 {7, 7},
1352                 {0, 0}
1353                 }
1354         },
1355         {1, 1, 3, 0,            /* 0xb7 */
1356                 {{0, 2},
1357                 {4, 5},
1358                 {7, 7},
1359                 {0, 0}
1360                 }
1361         },
1362         {0, 1, 2, 0,            /* 0xb8 */
1363                 {{3, 5},
1364                 {7, 7},
1365                 {0, 0},
1366                 {0, 0}
1367                 }
1368         },
1369         {1, 1, 3, 0,            /* 0xb9 */
1370                 {{0, 0},
1371                 {3, 5},
1372                 {7, 7},
1373                 {0, 0}
1374                 }
1375         },
1376         {0, 1, 3, 0,            /* 0xba */
1377                 {{1, 1},
1378                 {3, 5},
1379                 {7, 7},
1380                 {0, 0}
1381                 }
1382         },
1383         {1, 1, 3, 0,            /* 0xbb */
1384                 {{0, 1},
1385                 {3, 5},
1386                 {7, 7},
1387                 {0, 0}
1388                 }
1389         },
1390         {0, 1, 2, 0,            /* 0xbc */
1391                 {{2, 5},
1392                 {7, 7},
1393                 {0, 0},
1394                 {0, 0}
1395                 }
1396         },
1397         {1, 1, 3, 0,            /* 0xbd */
1398                 {{0, 0},
1399                 {2, 5},
1400                 {7, 7},
1401                 {0, 0}
1402                 }
1403         },
1404         {0, 1, 2, 0,            /* 0xbe */
1405                 {{1, 5},
1406                 {7, 7},
1407                 {0, 0},
1408                 {0, 0}
1409                 }
1410         },
1411         {1, 1, 2, 0,            /* 0xbf */
1412                 {{0, 5},
1413                 {7, 7},
1414                 {0, 0},
1415                 {0, 0}
1416                 }
1417         },
1418         {0, 1, 1, 0,            /* 0xc0 */
1419                 {{6, 7},
1420                 {0, 0},
1421                 {0, 0},
1422                 {0, 0}
1423                 }
1424         },
1425         {1, 1, 2, 0,            /* 0xc1 */
1426                 {{0, 0},
1427                 {6, 7},
1428                 {0, 0},
1429                 {0, 0}
1430                 }
1431         },
1432         {0, 1, 2, 0,            /* 0xc2 */
1433                 {{1, 1},
1434                 {6, 7},
1435                 {0, 0},
1436                 {0, 0}
1437                 }
1438         },
1439         {1, 1, 2, 0,            /* 0xc3 */
1440                 {{0, 1},
1441                 {6, 7},
1442                 {0, 0},
1443                 {0, 0}
1444                 }
1445         },
1446         {0, 1, 2, 0,            /* 0xc4 */
1447                 {{2, 2},
1448                 {6, 7},
1449                 {0, 0},
1450                 {0, 0}
1451                 }
1452         },
1453         {1, 1, 3, 0,            /* 0xc5 */
1454                 {{0, 0},
1455                 {2, 2},
1456                 {6, 7},
1457                 {0, 0}
1458                 }
1459         },
1460         {0, 1, 2, 0,            /* 0xc6 */
1461                 {{1, 2},
1462                 {6, 7},
1463                 {0, 0},
1464                 {0, 0}
1465                 }
1466         },
1467         {1, 1, 2, 0,            /* 0xc7 */
1468                 {{0, 2},
1469                 {6, 7},
1470                 {0, 0},
1471                 {0, 0}
1472                 }
1473         },
1474         {0, 1, 2, 0,            /* 0xc8 */
1475                 {{3, 3},
1476                 {6, 7},
1477                 {0, 0},
1478                 {0, 0}
1479                 }
1480         },
1481         {1, 1, 3, 0,            /* 0xc9 */
1482                 {{0, 0},
1483                 {3, 3},
1484                 {6, 7},
1485                 {0, 0}
1486                 }
1487         },
1488         {0, 1, 3, 0,            /* 0xca */
1489                 {{1, 1},
1490                 {3, 3},
1491                 {6, 7},
1492                 {0, 0}
1493                 }
1494         },
1495         {1, 1, 3, 0,            /* 0xcb */
1496                 {{0, 1},
1497                 {3, 3},
1498                 {6, 7},
1499                 {0, 0}
1500                 }
1501         },
1502         {0, 1, 2, 0,            /* 0xcc */
1503                 {{2, 3},
1504                 {6, 7},
1505                 {0, 0},
1506                 {0, 0}
1507                 }
1508         },
1509         {1, 1, 3, 0,            /* 0xcd */
1510                 {{0, 0},
1511                 {2, 3},
1512                 {6, 7},
1513                 {0, 0}
1514                 }
1515         },
1516         {0, 1, 2, 0,            /* 0xce */
1517                 {{1, 3},
1518                 {6, 7},
1519                 {0, 0},
1520                 {0, 0}
1521                 }
1522         },
1523         {1, 1, 2, 0,            /* 0xcf */
1524                 {{0, 3},
1525                 {6, 7},
1526                 {0, 0},
1527                 {0, 0}
1528                 }
1529         },
1530         {0, 1, 2, 0,            /* 0xd0 */
1531                 {{4, 4},
1532                 {6, 7},
1533                 {0, 0},
1534                 {0, 0}
1535                 }
1536         },
1537         {1, 1, 3, 0,            /* 0xd1 */
1538                 {{0, 0},
1539                 {4, 4},
1540                 {6, 7},
1541                 {0, 0}
1542                 }
1543         },
1544         {0, 1, 3, 0,            /* 0xd2 */
1545                 {{1, 1},
1546                 {4, 4},
1547                 {6, 7},
1548                 {0, 0}
1549                 }
1550         },
1551         {1, 1, 3, 0,            /* 0xd3 */
1552                 {{0, 1},
1553                 {4, 4},
1554                 {6, 7},
1555                 {0, 0}
1556                 }
1557         },
1558         {0, 1, 3, 0,            /* 0xd4 */
1559                 {{2, 2},
1560                 {4, 4},
1561                 {6, 7},
1562                 {0, 0}
1563                 }
1564         },
1565         {1, 1, 4, 0,            /* 0xd5 */
1566                 {{0, 0},
1567                 {2, 2},
1568                 {4, 4},
1569                 {6, 7}
1570                 }
1571         },
1572         {0, 1, 3, 0,            /* 0xd6 */
1573                 {{1, 2},
1574                 {4, 4},
1575                 {6, 7},
1576                 {0, 0}
1577                 }
1578         },
1579         {1, 1, 3, 0,            /* 0xd7 */
1580                 {{0, 2},
1581                 {4, 4},
1582                 {6, 7},
1583                 {0, 0}
1584                 }
1585         },
1586         {0, 1, 2, 0,            /* 0xd8 */
1587                 {{3, 4},
1588                 {6, 7},
1589                 {0, 0},
1590                 {0, 0}
1591                 }
1592         },
1593         {1, 1, 3, 0,            /* 0xd9 */
1594                 {{0, 0},
1595                 {3, 4},
1596                 {6, 7},
1597                 {0, 0}
1598                 }
1599         },
1600         {0, 1, 3, 0,            /* 0xda */
1601                 {{1, 1},
1602                 {3, 4},
1603                 {6, 7},
1604                 {0, 0}
1605                 }
1606         },
1607         {1, 1, 3, 0,            /* 0xdb */
1608                 {{0, 1},
1609                 {3, 4},
1610                 {6, 7},
1611                 {0, 0}
1612                 }
1613         },
1614         {0, 1, 2, 0,            /* 0xdc */
1615                 {{2, 4},
1616                 {6, 7},
1617                 {0, 0},
1618                 {0, 0}
1619                 }
1620         },
1621         {1, 1, 3, 0,            /* 0xdd */
1622                 {{0, 0},
1623                 {2, 4},
1624                 {6, 7},
1625                 {0, 0}
1626                 }
1627         },
1628         {0, 1, 2, 0,            /* 0xde */
1629                 {{1, 4},
1630                 {6, 7},
1631                 {0, 0},
1632                 {0, 0}
1633                 }
1634         },
1635         {1, 1, 2, 0,            /* 0xdf */
1636                 {{0, 4},
1637                 {6, 7},
1638                 {0, 0},
1639                 {0, 0}
1640                 }
1641         },
1642         {0, 1, 1, 0,            /* 0xe0 */
1643                 {{5, 7},
1644                 {0, 0},
1645                 {0, 0},
1646                 {0, 0}
1647                 }
1648         },
1649         {1, 1, 2, 0,            /* 0xe1 */
1650                 {{0, 0},
1651                 {5, 7},
1652                 {0, 0},
1653                 {0, 0}
1654                 }
1655         },
1656         {0, 1, 2, 0,            /* 0xe2 */
1657                 {{1, 1},
1658                 {5, 7},
1659                 {0, 0},
1660                 {0, 0}
1661                 }
1662         },
1663         {1, 1, 2, 0,            /* 0xe3 */
1664                 {{0, 1},
1665                 {5, 7},
1666                 {0, 0},
1667                 {0, 0}
1668                 }
1669         },
1670         {0, 1, 2, 0,            /* 0xe4 */
1671                 {{2, 2},
1672                 {5, 7},
1673                 {0, 0},
1674                 {0, 0}
1675                 }
1676         },
1677         {1, 1, 3, 0,            /* 0xe5 */
1678                 {{0, 0},
1679                 {2, 2},
1680                 {5, 7},
1681                 {0, 0}
1682                 }
1683         },
1684         {0, 1, 2, 0,            /* 0xe6 */
1685                 {{1, 2},
1686                 {5, 7},
1687                 {0, 0},
1688                 {0, 0}
1689                 }
1690         },
1691         {1, 1, 2, 0,            /* 0xe7 */
1692                 {{0, 2},
1693                 {5, 7},
1694                 {0, 0},
1695                 {0, 0}
1696                 }
1697         },
1698         {0, 1, 2, 0,            /* 0xe8 */
1699                 {{3, 3},
1700                 {5, 7},
1701                 {0, 0},
1702                 {0, 0}
1703                 }
1704         },
1705         {1, 1, 3, 0,            /* 0xe9 */
1706                 {{0, 0},
1707                 {3, 3},
1708                 {5, 7},
1709                 {0, 0}
1710                 }
1711         },
1712         {0, 1, 3, 0,            /* 0xea */
1713                 {{1, 1},
1714                 {3, 3},
1715                 {5, 7},
1716                 {0, 0}
1717                 }
1718         },
1719         {1, 1, 3, 0,            /* 0xeb */
1720                 {{0, 1},
1721                 {3, 3},
1722                 {5, 7},
1723                 {0, 0}
1724                 }
1725         },
1726         {0, 1, 2, 0,            /* 0xec */
1727                 {{2, 3},
1728                 {5, 7},
1729                 {0, 0},
1730                 {0, 0}
1731                 }
1732         },
1733         {1, 1, 3, 0,            /* 0xed */
1734                 {{0, 0},
1735                 {2, 3},
1736                 {5, 7},
1737                 {0, 0}
1738                 }
1739         },
1740         {0, 1, 2, 0,            /* 0xee */
1741                 {{1, 3},
1742                 {5, 7},
1743                 {0, 0},
1744                 {0, 0}
1745                 }
1746         },
1747         {1, 1, 2, 0,            /* 0xef */
1748                 {{0, 3},
1749                 {5, 7},
1750                 {0, 0},
1751                 {0, 0}
1752                 }
1753         },
1754         {0, 1, 1, 0,            /* 0xf0 */
1755                 {{4, 7},
1756                 {0, 0},
1757                 {0, 0},
1758                 {0, 0}
1759                 }
1760         },
1761         {1, 1, 2, 0,            /* 0xf1 */
1762                 {{0, 0},
1763                 {4, 7},
1764                 {0, 0},
1765                 {0, 0}
1766                 }
1767         },
1768         {0, 1, 2, 0,            /* 0xf2 */
1769                 {{1, 1},
1770                 {4, 7},
1771                 {0, 0},
1772                 {0, 0}
1773                 }
1774         },
1775         {1, 1, 2, 0,            /* 0xf3 */
1776                 {{0, 1},
1777                 {4, 7},
1778                 {0, 0},
1779                 {0, 0}
1780                 }
1781         },
1782         {0, 1, 2, 0,            /* 0xf4 */
1783                 {{2, 2},
1784                 {4, 7},
1785                 {0, 0},
1786                 {0, 0}
1787                 }
1788         },
1789         {1, 1, 3, 0,            /* 0xf5 */
1790                 {{0, 0},
1791                 {2, 2},
1792                 {4, 7},
1793                 {0, 0}
1794                 }
1795         },
1796         {0, 1, 2, 0,            /* 0xf6 */
1797                 {{1, 2},
1798                 {4, 7},
1799                 {0, 0},
1800                 {0, 0}
1801                 }
1802         },
1803         {1, 1, 2, 0,            /* 0xf7 */
1804                 {{0, 2},
1805                 {4, 7},
1806                 {0, 0},
1807                 {0, 0}
1808                 }
1809         },
1810         {0, 1, 1, 0,            /* 0xf8 */
1811                 {{3, 7},
1812                 {0, 0},
1813                 {0, 0},
1814                 {0, 0}
1815                 }
1816         },
1817         {1, 1, 2, 0,            /* 0xf9 */
1818                 {{0, 0},
1819                 {3, 7},
1820                 {0, 0},
1821                 {0, 0}
1822                 }
1823         },
1824         {0, 1, 2, 0,            /* 0xfa */
1825                 {{1, 1},
1826                 {3, 7},
1827                 {0, 0},
1828                 {0, 0}
1829                 }
1830         },
1831         {1, 1, 2, 0,            /* 0xfb */
1832                 {{0, 1},
1833                 {3, 7},
1834                 {0, 0},
1835                 {0, 0}
1836                 }
1837         },
1838         {0, 1, 1, 0,            /* 0xfc */
1839                 {{2, 7},
1840                 {0, 0},
1841                 {0, 0},
1842                 {0, 0}
1843                 }
1844         },
1845         {1, 1, 2, 0,            /* 0xfd */
1846                 {{0, 0},
1847                 {2, 7},
1848                 {0, 0},
1849                 {0, 0}
1850                 }
1851         },
1852         {0, 1, 1, 0,            /* 0xfe */
1853                 {{1, 7},
1854                 {0, 0},
1855                 {0, 0},
1856                 {0, 0}
1857                 }
1858         },
1859         {1, 1, 1, 0,            /* 0xff */
1860                 {{0, 7},
1861                 {0, 0},
1862                 {0, 0},
1863                 {0, 0}
1864                 }
1865         }
1866 };
1867
1868
1869 int
1870 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1871     struct sctp_scoping *scope,
1872     int do_update)
1873 {
1874         if ((scope->loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (scope->ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = &ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((scope->ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (scope->ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = &ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((scope->site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1944 {
1945 #if defined(INET) || defined(INET6)
1946         struct sctp_paramhdr *paramh;
1947         struct mbuf *mret;
1948         uint16_t plen;
1949 #endif
1950
1951         switch (ifa->address.sa.sa_family) {
1952 #ifdef INET
1953         case AF_INET:
1954                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1955                 break;
1956 #endif
1957 #ifdef INET6
1958         case AF_INET6:
1959                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1960                 break;
1961 #endif
1962         default:
1963                 return (m);
1964         }
1965 #if defined(INET) || defined(INET6)
1966         if (M_TRAILINGSPACE(m) >= plen) {
1967                 /* easy side we just drop it on the end */
1968                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1969                 mret = m;
1970         } else {
1971                 /* Need more space */
1972                 mret = m;
1973                 while (SCTP_BUF_NEXT(mret) != NULL) {
1974                         mret = SCTP_BUF_NEXT(mret);
1975                 }
1976                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1977                 if (SCTP_BUF_NEXT(mret) == NULL) {
1978                         /* We are hosed, can't add more addresses */
1979                         return (m);
1980                 }
1981                 mret = SCTP_BUF_NEXT(mret);
1982                 paramh = mtod(mret, struct sctp_paramhdr *);
1983         }
1984         /* now add the parameter */
1985         switch (ifa->address.sa.sa_family) {
1986 #ifdef INET
1987         case AF_INET:
1988                 {
1989                         struct sctp_ipv4addr_param *ipv4p;
1990                         struct sockaddr_in *sin;
1991
1992                         sin = &ifa->address.sin;
1993                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1994                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1995                         paramh->param_length = htons(plen);
1996                         ipv4p->addr = sin->sin_addr.s_addr;
1997                         SCTP_BUF_LEN(mret) += plen;
1998                         break;
1999                 }
2000 #endif
2001 #ifdef INET6
2002         case AF_INET6:
2003                 {
2004                         struct sctp_ipv6addr_param *ipv6p;
2005                         struct sockaddr_in6 *sin6;
2006
2007                         sin6 = &ifa->address.sin6;
2008                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2009                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2010                         paramh->param_length = htons(plen);
2011                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2012                             sizeof(ipv6p->addr));
2013                         /* clear embedded scope in the address */
2014                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2015                         SCTP_BUF_LEN(mret) += plen;
2016                         break;
2017                 }
2018 #endif
2019         default:
2020                 return (m);
2021         }
2022         if (len != NULL) {
2023                 *len += plen;
2024         }
2025         return (mret);
2026 #endif
2027 }
2028
2029
2030 struct mbuf *
2031 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2032     struct sctp_scoping *scope,
2033     struct mbuf *m_at, int cnt_inits_to,
2034     uint16_t *padding_len, uint16_t *chunk_len)
2035 {
2036         struct sctp_vrf *vrf = NULL;
2037         int cnt, limit_out = 0, total_count;
2038         uint32_t vrf_id;
2039
2040         vrf_id = inp->def_vrf_id;
2041         SCTP_IPI_ADDR_RLOCK();
2042         vrf = sctp_find_vrf(vrf_id);
2043         if (vrf == NULL) {
2044                 SCTP_IPI_ADDR_RUNLOCK();
2045                 return (m_at);
2046         }
2047         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2048                 struct sctp_ifa *sctp_ifap;
2049                 struct sctp_ifn *sctp_ifnp;
2050
2051                 cnt = cnt_inits_to;
2052                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2053                         limit_out = 1;
2054                         cnt = SCTP_ADDRESS_LIMIT;
2055                         goto skip_count;
2056                 }
2057                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2058                         if ((scope->loopback_scope == 0) &&
2059                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2060                                 /*
2061                                  * Skip loopback devices if loopback_scope
2062                                  * not set
2063                                  */
2064                                 continue;
2065                         }
2066                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2067 #ifdef INET
2068                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2069                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2070                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2071                                         continue;
2072                                 }
2073 #endif
2074 #ifdef INET6
2075                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2076                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2077                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2078                                         continue;
2079                                 }
2080 #endif
2081                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2082                                         continue;
2083                                 }
2084                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2085                                         continue;
2086                                 }
2087                                 cnt++;
2088                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2089                                         break;
2090                                 }
2091                         }
2092                         if (cnt > SCTP_ADDRESS_LIMIT) {
2093                                 break;
2094                         }
2095                 }
2096 skip_count:
2097                 if (cnt > 1) {
2098                         total_count = 0;
2099                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2100                                 cnt = 0;
2101                                 if ((scope->loopback_scope == 0) &&
2102                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2103                                         /*
2104                                          * Skip loopback devices if
2105                                          * loopback_scope not set
2106                                          */
2107                                         continue;
2108                                 }
2109                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2110 #ifdef INET
2111                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2112                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2113                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2114                                                 continue;
2115                                         }
2116 #endif
2117 #ifdef INET6
2118                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2119                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2120                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2121                                                 continue;
2122                                         }
2123 #endif
2124                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2125                                                 continue;
2126                                         }
2127                                         if (sctp_is_address_in_scope(sctp_ifap,
2128                                             scope, 0) == 0) {
2129                                                 continue;
2130                                         }
2131                                         if ((chunk_len != NULL) &&
2132                                             (padding_len != NULL) &&
2133                                             (*padding_len > 0)) {
2134                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2135                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2136                                                 *chunk_len += *padding_len;
2137                                                 *padding_len = 0;
2138                                         }
2139                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2140                                         if (limit_out) {
2141                                                 cnt++;
2142                                                 total_count++;
2143                                                 if (cnt >= 2) {
2144                                                         /*
2145                                                          * two from each
2146                                                          * address
2147                                                          */
2148                                                         break;
2149                                                 }
2150                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2151                                                         /* No more addresses */
2152                                                         break;
2153                                                 }
2154                                         }
2155                                 }
2156                         }
2157                 }
2158         } else {
2159                 struct sctp_laddr *laddr;
2160
2161                 cnt = cnt_inits_to;
2162                 /* First, how many ? */
2163                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2164                         if (laddr->ifa == NULL) {
2165                                 continue;
2166                         }
2167                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2168                                 /*
2169                                  * Address being deleted by the system, dont
2170                                  * list.
2171                                  */
2172                                 continue;
2173                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2174                                 /*
2175                                  * Address being deleted on this ep don't
2176                                  * list.
2177                                  */
2178                                 continue;
2179                         }
2180                         if (sctp_is_address_in_scope(laddr->ifa,
2181                             scope, 1) == 0) {
2182                                 continue;
2183                         }
2184                         cnt++;
2185                 }
2186                 /*
2187                  * To get through a NAT we only list addresses if we have
2188                  * more than one. That way if you just bind a single address
2189                  * we let the source of the init dictate our address.
2190                  */
2191                 if (cnt > 1) {
2192                         cnt = cnt_inits_to;
2193                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2194                                 if (laddr->ifa == NULL) {
2195                                         continue;
2196                                 }
2197                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2198                                         continue;
2199                                 }
2200                                 if (sctp_is_address_in_scope(laddr->ifa,
2201                                     scope, 0) == 0) {
2202                                         continue;
2203                                 }
2204                                 if ((chunk_len != NULL) &&
2205                                     (padding_len != NULL) &&
2206                                     (*padding_len > 0)) {
2207                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2208                                         SCTP_BUF_LEN(m_at) += *padding_len;
2209                                         *chunk_len += *padding_len;
2210                                         *padding_len = 0;
2211                                 }
2212                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2213                                 cnt++;
2214                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2215                                         break;
2216                                 }
2217                         }
2218                 }
2219         }
2220         SCTP_IPI_ADDR_RUNLOCK();
2221         return (m_at);
2222 }
2223
2224 static struct sctp_ifa *
2225 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2226     uint8_t dest_is_loop,
2227     uint8_t dest_is_priv,
2228     sa_family_t fam)
2229 {
2230         uint8_t dest_is_global = 0;
2231
2232         /* dest_is_priv is true if destination is a private address */
2233         /* dest_is_loop is true if destination is a loopback addresses */
2234
2235         /**
2236          * Here we determine if its a preferred address. A preferred address
2237          * means it is the same scope or higher scope then the destination.
2238          * L = loopback, P = private, G = global
2239          * -----------------------------------------
2240          *    src    |  dest | result
2241          *  ----------------------------------------
2242          *     L     |    L  |    yes
2243          *  -----------------------------------------
2244          *     P     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     G     |    L  |    yes-v4 no-v6
2247          *  -----------------------------------------
2248          *     L     |    P  |    no
2249          *  -----------------------------------------
2250          *     P     |    P  |    yes
2251          *  -----------------------------------------
2252          *     G     |    P  |    no
2253          *   -----------------------------------------
2254          *     L     |    G  |    no
2255          *   -----------------------------------------
2256          *     P     |    G  |    no
2257          *    -----------------------------------------
2258          *     G     |    G  |    yes
2259          *    -----------------------------------------
2260          */
2261
2262         if (ifa->address.sa.sa_family != fam) {
2263                 /* forget mis-matched family */
2264                 return (NULL);
2265         }
2266         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2267                 dest_is_global = 1;
2268         }
2269         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2270         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2271         /* Ok the address may be ok */
2272 #ifdef INET6
2273         if (fam == AF_INET6) {
2274                 /* ok to use deprecated addresses? no lets not! */
2275                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2276                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2277                         return (NULL);
2278                 }
2279                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2280                         if (dest_is_loop) {
2281                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2282                                 return (NULL);
2283                         }
2284                 }
2285                 if (ifa->src_is_glob) {
2286                         if (dest_is_loop) {
2287                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2288                                 return (NULL);
2289                         }
2290                 }
2291         }
2292 #endif
2293         /*
2294          * Now that we know what is what, implement or table this could in
2295          * theory be done slicker (it used to be), but this is
2296          * straightforward and easier to validate :-)
2297          */
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2299             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2300         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2301             dest_is_loop, dest_is_priv, dest_is_global);
2302
2303         if ((ifa->src_is_loop) && (dest_is_priv)) {
2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2305                 return (NULL);
2306         }
2307         if ((ifa->src_is_glob) && (dest_is_priv)) {
2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2309                 return (NULL);
2310         }
2311         if ((ifa->src_is_loop) && (dest_is_global)) {
2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2313                 return (NULL);
2314         }
2315         if ((ifa->src_is_priv) && (dest_is_global)) {
2316                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2317                 return (NULL);
2318         }
2319         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2320         /* its a preferred address */
2321         return (ifa);
2322 }
2323
2324 static struct sctp_ifa *
2325 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2326     uint8_t dest_is_loop,
2327     uint8_t dest_is_priv,
2328     sa_family_t fam)
2329 {
2330         uint8_t dest_is_global = 0;
2331
2332         /**
2333          * Here we determine if its a acceptable address. A acceptable
2334          * address means it is the same scope or higher scope but we can
2335          * allow for NAT which means its ok to have a global dest and a
2336          * private src.
2337          *
2338          * L = loopback, P = private, G = global
2339          * -----------------------------------------
2340          *  src    |  dest | result
2341          * -----------------------------------------
2342          *   L     |   L   |    yes
2343          *  -----------------------------------------
2344          *   P     |   L   |    yes-v4 no-v6
2345          *  -----------------------------------------
2346          *   G     |   L   |    yes
2347          * -----------------------------------------
2348          *   L     |   P   |    no
2349          * -----------------------------------------
2350          *   P     |   P   |    yes
2351          * -----------------------------------------
2352          *   G     |   P   |    yes - May not work
2353          * -----------------------------------------
2354          *   L     |   G   |    no
2355          * -----------------------------------------
2356          *   P     |   G   |    yes - May not work
2357          * -----------------------------------------
2358          *   G     |   G   |    yes
2359          * -----------------------------------------
2360          */
2361
2362         if (ifa->address.sa.sa_family != fam) {
2363                 /* forget non matching family */
2364                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2365                     ifa->address.sa.sa_family, fam);
2366                 return (NULL);
2367         }
2368         /* Ok the address may be ok */
2369         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2370         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2371             dest_is_loop, dest_is_priv);
2372         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2373                 dest_is_global = 1;
2374         }
2375 #ifdef INET6
2376         if (fam == AF_INET6) {
2377                 /* ok to use deprecated addresses? */
2378                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2379                         return (NULL);
2380                 }
2381                 if (ifa->src_is_priv) {
2382                         /* Special case, linklocal to loop */
2383                         if (dest_is_loop)
2384                                 return (NULL);
2385                 }
2386         }
2387 #endif
2388         /*
2389          * Now that we know what is what, implement our table. This could in
2390          * theory be done slicker (it used to be), but this is
2391          * straightforward and easier to validate :-)
2392          */
2393         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2394             ifa->src_is_loop,
2395             dest_is_priv);
2396         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2397                 return (NULL);
2398         }
2399         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2400             ifa->src_is_loop,
2401             dest_is_global);
2402         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2403                 return (NULL);
2404         }
2405         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2406         /* its an acceptable address */
2407         return (ifa);
2408 }
2409
2410 int
2411 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2412 {
2413         struct sctp_laddr *laddr;
2414
2415         if (stcb == NULL) {
2416                 /* There are no restrictions, no TCB :-) */
2417                 return (0);
2418         }
2419         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2420                 if (laddr->ifa == NULL) {
2421                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2422                             __func__);
2423                         continue;
2424                 }
2425                 if (laddr->ifa == ifa) {
2426                         /* Yes it is on the list */
2427                         return (1);
2428                 }
2429         }
2430         return (0);
2431 }
2432
2433
2434 int
2435 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2436 {
2437         struct sctp_laddr *laddr;
2438
2439         if (ifa == NULL)
2440                 return (0);
2441         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2442                 if (laddr->ifa == NULL) {
2443                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2444                             __func__);
2445                         continue;
2446                 }
2447                 if ((laddr->ifa == ifa) && laddr->action == 0)
2448                         /* same pointer */
2449                         return (1);
2450         }
2451         return (0);
2452 }
2453
2454
2455
2456 static struct sctp_ifa *
2457 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2458     sctp_route_t *ro,
2459     uint32_t vrf_id,
2460     int non_asoc_addr_ok,
2461     uint8_t dest_is_priv,
2462     uint8_t dest_is_loop,
2463     sa_family_t fam)
2464 {
2465         struct sctp_laddr *laddr, *starting_point;
2466         void *ifn;
2467         int resettotop = 0;
2468         struct sctp_ifn *sctp_ifn;
2469         struct sctp_ifa *sctp_ifa, *sifa;
2470         struct sctp_vrf *vrf;
2471         uint32_t ifn_index;
2472
2473         vrf = sctp_find_vrf(vrf_id);
2474         if (vrf == NULL)
2475                 return (NULL);
2476
2477         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2478         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2479         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2480         /*
2481          * first question, is the ifn we will emit on in our list, if so, we
2482          * want such an address. Note that we first looked for a preferred
2483          * address.
2484          */
2485         if (sctp_ifn) {
2486                 /* is a preferred one on the interface we route out? */
2487                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2488 #ifdef INET
2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2490                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2491                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2492                                 continue;
2493                         }
2494 #endif
2495 #ifdef INET6
2496                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2497                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2498                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2499                                 continue;
2500                         }
2501 #endif
2502                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2503                             (non_asoc_addr_ok == 0))
2504                                 continue;
2505                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2506                             dest_is_loop,
2507                             dest_is_priv, fam);
2508                         if (sifa == NULL)
2509                                 continue;
2510                         if (sctp_is_addr_in_ep(inp, sifa)) {
2511                                 atomic_add_int(&sifa->refcount, 1);
2512                                 return (sifa);
2513                         }
2514                 }
2515         }
2516         /*
2517          * ok, now we now need to find one on the list of the addresses. We
2518          * can't get one on the emitting interface so let's find first a
2519          * preferred one. If not that an acceptable one otherwise... we
2520          * return NULL.
2521          */
2522         starting_point = inp->next_addr_touse;
2523 once_again:
2524         if (inp->next_addr_touse == NULL) {
2525                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2526                 resettotop = 1;
2527         }
2528         for (laddr = inp->next_addr_touse; laddr;
2529             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2530                 if (laddr->ifa == NULL) {
2531                         /* address has been removed */
2532                         continue;
2533                 }
2534                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2535                         /* address is being deleted */
2536                         continue;
2537                 }
2538                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2539                     dest_is_priv, fam);
2540                 if (sifa == NULL)
2541                         continue;
2542                 atomic_add_int(&sifa->refcount, 1);
2543                 return (sifa);
2544         }
2545         if (resettotop == 0) {
2546                 inp->next_addr_touse = NULL;
2547                 goto once_again;
2548         }
2549
2550         inp->next_addr_touse = starting_point;
2551         resettotop = 0;
2552 once_again_too:
2553         if (inp->next_addr_touse == NULL) {
2554                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2555                 resettotop = 1;
2556         }
2557
2558         /* ok, what about an acceptable address in the inp */
2559         for (laddr = inp->next_addr_touse; laddr;
2560             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2561                 if (laddr->ifa == NULL) {
2562                         /* address has been removed */
2563                         continue;
2564                 }
2565                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2566                         /* address is being deleted */
2567                         continue;
2568                 }
2569                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2570                     dest_is_priv, fam);
2571                 if (sifa == NULL)
2572                         continue;
2573                 atomic_add_int(&sifa->refcount, 1);
2574                 return (sifa);
2575         }
2576         if (resettotop == 0) {
2577                 inp->next_addr_touse = NULL;
2578                 goto once_again_too;
2579         }
2580
2581         /*
2582          * no address bound can be a source for the destination we are in
2583          * trouble
2584          */
2585         return (NULL);
2586 }
2587
2588
2589
2590 static struct sctp_ifa *
2591 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2592     struct sctp_tcb *stcb,
2593     sctp_route_t *ro,
2594     uint32_t vrf_id,
2595     uint8_t dest_is_priv,
2596     uint8_t dest_is_loop,
2597     int non_asoc_addr_ok,
2598     sa_family_t fam)
2599 {
2600         struct sctp_laddr *laddr, *starting_point;
2601         void *ifn;
2602         struct sctp_ifn *sctp_ifn;
2603         struct sctp_ifa *sctp_ifa, *sifa;
2604         uint8_t start_at_beginning = 0;
2605         struct sctp_vrf *vrf;
2606         uint32_t ifn_index;
2607
2608         /*
2609          * first question, is the ifn we will emit on in our list, if so, we
2610          * want that one.
2611          */
2612         vrf = sctp_find_vrf(vrf_id);
2613         if (vrf == NULL)
2614                 return (NULL);
2615
2616         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2617         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2618         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2619
2620         /*
2621          * first question, is the ifn we will emit on in our list?  If so,
2622          * we want that one. First we look for a preferred. Second, we go
2623          * for an acceptable.
2624          */
2625         if (sctp_ifn) {
2626                 /* first try for a preferred address on the ep */
2627                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2628 #ifdef INET
2629                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2630                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2631                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2632                                 continue;
2633                         }
2634 #endif
2635 #ifdef INET6
2636                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2637                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2638                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2639                                 continue;
2640                         }
2641 #endif
2642                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2643                                 continue;
2644                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2645                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2646                                 if (sifa == NULL)
2647                                         continue;
2648                                 if (((non_asoc_addr_ok == 0) &&
2649                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2650                                     (non_asoc_addr_ok &&
2651                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2652                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2653                                         /* on the no-no list */
2654                                         continue;
2655                                 }
2656                                 atomic_add_int(&sifa->refcount, 1);
2657                                 return (sifa);
2658                         }
2659                 }
2660                 /* next try for an acceptable address on the ep */
2661                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2662 #ifdef INET
2663                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2664                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2665                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2666                                 continue;
2667                         }
2668 #endif
2669 #ifdef INET6
2670                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2671                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2672                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2673                                 continue;
2674                         }
2675 #endif
2676                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2677                                 continue;
2678                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2679                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2680                                 if (sifa == NULL)
2681                                         continue;
2682                                 if (((non_asoc_addr_ok == 0) &&
2683                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2684                                     (non_asoc_addr_ok &&
2685                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2686                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2687                                         /* on the no-no list */
2688                                         continue;
2689                                 }
2690                                 atomic_add_int(&sifa->refcount, 1);
2691                                 return (sifa);
2692                         }
2693                 }
2694
2695         }
2696         /*
2697          * if we can't find one like that then we must look at all addresses
2698          * bound to pick one at first preferable then secondly acceptable.
2699          */
2700         starting_point = stcb->asoc.last_used_address;
2701 sctp_from_the_top:
2702         if (stcb->asoc.last_used_address == NULL) {
2703                 start_at_beginning = 1;
2704                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2705         }
2706         /* search beginning with the last used address */
2707         for (laddr = stcb->asoc.last_used_address; laddr;
2708             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2709                 if (laddr->ifa == NULL) {
2710                         /* address has been removed */
2711                         continue;
2712                 }
2713                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2714                         /* address is being deleted */
2715                         continue;
2716                 }
2717                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2718                 if (sifa == NULL)
2719                         continue;
2720                 if (((non_asoc_addr_ok == 0) &&
2721                     (sctp_is_addr_restricted(stcb, sifa))) ||
2722                     (non_asoc_addr_ok &&
2723                     (sctp_is_addr_restricted(stcb, sifa)) &&
2724                     (!sctp_is_addr_pending(stcb, sifa)))) {
2725                         /* on the no-no list */
2726                         continue;
2727                 }
2728                 stcb->asoc.last_used_address = laddr;
2729                 atomic_add_int(&sifa->refcount, 1);
2730                 return (sifa);
2731         }
2732         if (start_at_beginning == 0) {
2733                 stcb->asoc.last_used_address = NULL;
2734                 goto sctp_from_the_top;
2735         }
2736         /* now try for any higher scope than the destination */
2737         stcb->asoc.last_used_address = starting_point;
2738         start_at_beginning = 0;
2739 sctp_from_the_top2:
2740         if (stcb->asoc.last_used_address == NULL) {
2741                 start_at_beginning = 1;
2742                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2743         }
2744         /* search beginning with the last used address */
2745         for (laddr = stcb->asoc.last_used_address; laddr;
2746             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2747                 if (laddr->ifa == NULL) {
2748                         /* address has been removed */
2749                         continue;
2750                 }
2751                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2752                         /* address is being deleted */
2753                         continue;
2754                 }
2755                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2756                     dest_is_priv, fam);
2757                 if (sifa == NULL)
2758                         continue;
2759                 if (((non_asoc_addr_ok == 0) &&
2760                     (sctp_is_addr_restricted(stcb, sifa))) ||
2761                     (non_asoc_addr_ok &&
2762                     (sctp_is_addr_restricted(stcb, sifa)) &&
2763                     (!sctp_is_addr_pending(stcb, sifa)))) {
2764                         /* on the no-no list */
2765                         continue;
2766                 }
2767                 stcb->asoc.last_used_address = laddr;
2768                 atomic_add_int(&sifa->refcount, 1);
2769                 return (sifa);
2770         }
2771         if (start_at_beginning == 0) {
2772                 stcb->asoc.last_used_address = NULL;
2773                 goto sctp_from_the_top2;
2774         }
2775         return (NULL);
2776 }
2777
2778 static struct sctp_ifa *
2779 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2780     struct sctp_inpcb *inp,
2781     struct sctp_tcb *stcb,
2782     int non_asoc_addr_ok,
2783     uint8_t dest_is_loop,
2784     uint8_t dest_is_priv,
2785     int addr_wanted,
2786     sa_family_t fam,
2787     sctp_route_t *ro
2788 )
2789 {
2790         struct sctp_ifa *ifa, *sifa;
2791         int num_eligible_addr = 0;
2792 #ifdef INET6
2793         struct sockaddr_in6 sin6, lsa6;
2794
2795         if (fam == AF_INET6) {
2796                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2797                 (void)sa6_recoverscope(&sin6);
2798         }
2799 #endif                          /* INET6 */
2800         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2801 #ifdef INET
2802                 if ((ifa->address.sa.sa_family == AF_INET) &&
2803                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2804                     &ifa->address.sin.sin_addr) != 0)) {
2805                         continue;
2806                 }
2807 #endif
2808 #ifdef INET6
2809                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2810                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2811                     &ifa->address.sin6.sin6_addr) != 0)) {
2812                         continue;
2813                 }
2814 #endif
2815                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2816                     (non_asoc_addr_ok == 0))
2817                         continue;
2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819                     dest_is_priv, fam);
2820                 if (sifa == NULL)
2821                         continue;
2822 #ifdef INET6
2823                 if (fam == AF_INET6 &&
2824                     dest_is_loop &&
2825                     sifa->src_is_loop && sifa->src_is_priv) {
2826                         /*
2827                          * don't allow fe80::1 to be a src on loop ::1, we
2828                          * don't list it to the peer so we will get an
2829                          * abort.
2830                          */
2831                         continue;
2832                 }
2833                 if (fam == AF_INET6 &&
2834                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2835                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2836                         /*
2837                          * link-local <-> link-local must belong to the same
2838                          * scope.
2839                          */
2840                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2841                         (void)sa6_recoverscope(&lsa6);
2842                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2843                                 continue;
2844                         }
2845                 }
2846 #endif                          /* INET6 */
2847
2848                 /*
2849                  * Check if the IPv6 address matches to next-hop. In the
2850                  * mobile case, old IPv6 address may be not deleted from the
2851                  * interface. Then, the interface has previous and new
2852                  * addresses.  We should use one corresponding to the
2853                  * next-hop.  (by micchie)
2854                  */
2855 #ifdef INET6
2856                 if (stcb && fam == AF_INET6 &&
2857                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2858                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2859                             == 0) {
2860                                 continue;
2861                         }
2862                 }
2863 #endif
2864 #ifdef INET
2865                 /* Avoid topologically incorrect IPv4 address */
2866                 if (stcb && fam == AF_INET &&
2867                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2868                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2869                                 continue;
2870                         }
2871                 }
2872 #endif
2873                 if (stcb) {
2874                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2875                                 continue;
2876                         }
2877                         if (((non_asoc_addr_ok == 0) &&
2878                             (sctp_is_addr_restricted(stcb, sifa))) ||
2879                             (non_asoc_addr_ok &&
2880                             (sctp_is_addr_restricted(stcb, sifa)) &&
2881                             (!sctp_is_addr_pending(stcb, sifa)))) {
2882                                 /*
2883                                  * It is restricted for some reason..
2884                                  * probably not yet added.
2885                                  */
2886                                 continue;
2887                         }
2888                 }
2889                 if (num_eligible_addr >= addr_wanted) {
2890                         return (sifa);
2891                 }
2892                 num_eligible_addr++;
2893         }
2894         return (NULL);
2895 }
2896
2897
2898 static int
2899 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2900     struct sctp_inpcb *inp,
2901     struct sctp_tcb *stcb,
2902     int non_asoc_addr_ok,
2903     uint8_t dest_is_loop,
2904     uint8_t dest_is_priv,
2905     sa_family_t fam)
2906 {
2907         struct sctp_ifa *ifa, *sifa;
2908         int num_eligible_addr = 0;
2909
2910         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2911 #ifdef INET
2912                 if ((ifa->address.sa.sa_family == AF_INET) &&
2913                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2914                     &ifa->address.sin.sin_addr) != 0)) {
2915                         continue;
2916                 }
2917 #endif
2918 #ifdef INET6
2919                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2920                     (stcb != NULL) &&
2921                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2922                     &ifa->address.sin6.sin6_addr) != 0)) {
2923                         continue;
2924                 }
2925 #endif
2926                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2927                     (non_asoc_addr_ok == 0)) {
2928                         continue;
2929                 }
2930                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2931                     dest_is_priv, fam);
2932                 if (sifa == NULL) {
2933                         continue;
2934                 }
2935                 if (stcb) {
2936                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2937                                 continue;
2938                         }
2939                         if (((non_asoc_addr_ok == 0) &&
2940                             (sctp_is_addr_restricted(stcb, sifa))) ||
2941                             (non_asoc_addr_ok &&
2942                             (sctp_is_addr_restricted(stcb, sifa)) &&
2943                             (!sctp_is_addr_pending(stcb, sifa)))) {
2944                                 /*
2945                                  * It is restricted for some reason..
2946                                  * probably not yet added.
2947                                  */
2948                                 continue;
2949                         }
2950                 }
2951                 num_eligible_addr++;
2952         }
2953         return (num_eligible_addr);
2954 }
2955
2956 static struct sctp_ifa *
2957 sctp_choose_boundall(struct sctp_inpcb *inp,
2958     struct sctp_tcb *stcb,
2959     struct sctp_nets *net,
2960     sctp_route_t *ro,
2961     uint32_t vrf_id,
2962     uint8_t dest_is_priv,
2963     uint8_t dest_is_loop,
2964     int non_asoc_addr_ok,
2965     sa_family_t fam)
2966 {
2967         int cur_addr_num = 0, num_preferred = 0;
2968         void *ifn;
2969         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2970         struct sctp_ifa *sctp_ifa, *sifa;
2971         uint32_t ifn_index;
2972         struct sctp_vrf *vrf;
2973 #ifdef INET
2974         int retried = 0;
2975 #endif
2976
2977         /*-
2978          * For boundall we can use any address in the association.
2979          * If non_asoc_addr_ok is set we can use any address (at least in
2980          * theory). So we look for preferred addresses first. If we find one,
2981          * we use it. Otherwise we next try to get an address on the
2982          * interface, which we should be able to do (unless non_asoc_addr_ok
2983          * is false and we are routed out that way). In these cases where we
2984          * can't use the address of the interface we go through all the
2985          * ifn's looking for an address we can use and fill that in. Punting
2986          * means we send back address 0, which will probably cause problems
2987          * actually since then IP will fill in the address of the route ifn,
2988          * which means we probably already rejected it.. i.e. here comes an
2989          * abort :-<.
2990          */
2991         vrf = sctp_find_vrf(vrf_id);
2992         if (vrf == NULL)
2993                 return (NULL);
2994
2995         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2996         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2997         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2998         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2999         if (sctp_ifn == NULL) {
3000                 /* ?? We don't have this guy ?? */
3001                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3002                 goto bound_all_plan_b;
3003         }
3004         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3005             ifn_index, sctp_ifn->ifn_name);
3006
3007         if (net) {
3008                 cur_addr_num = net->indx_of_eligible_next_to_use;
3009         }
3010         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3011             inp, stcb,
3012             non_asoc_addr_ok,
3013             dest_is_loop,
3014             dest_is_priv, fam);
3015         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3016             num_preferred, sctp_ifn->ifn_name);
3017         if (num_preferred == 0) {
3018                 /*
3019                  * no eligible addresses, we must use some other interface
3020                  * address if we can find one.
3021                  */
3022                 goto bound_all_plan_b;
3023         }
3024         /*
3025          * Ok we have num_eligible_addr set with how many we can use, this
3026          * may vary from call to call due to addresses being deprecated
3027          * etc..
3028          */
3029         if (cur_addr_num >= num_preferred) {
3030                 cur_addr_num = 0;
3031         }
3032         /*
3033          * select the nth address from the list (where cur_addr_num is the
3034          * nth) and 0 is the first one, 1 is the second one etc...
3035          */
3036         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3037
3038         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3039             dest_is_priv, cur_addr_num, fam, ro);
3040
3041         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3042         if (sctp_ifa) {
3043                 atomic_add_int(&sctp_ifa->refcount, 1);
3044                 if (net) {
3045                         /* save off where the next one we will want */
3046                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3047                 }
3048                 return (sctp_ifa);
3049         }
3050         /*
3051          * plan_b: Look at all interfaces and find a preferred address. If
3052          * no preferred fall through to plan_c.
3053          */
3054 bound_all_plan_b:
3055         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3056         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3057                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3058                     sctp_ifn->ifn_name);
3059                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3060                         /* wrong base scope */
3061                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3062                         continue;
3063                 }
3064                 if ((sctp_ifn == looked_at) && looked_at) {
3065                         /* already looked at this guy */
3066                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3067                         continue;
3068                 }
3069                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3070                     dest_is_loop, dest_is_priv, fam);
3071                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3072                     "Found ifn:%p %d preferred source addresses\n",
3073                     ifn, num_preferred);
3074                 if (num_preferred == 0) {
3075                         /* None on this interface. */
3076                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3077                         continue;
3078                 }
3079                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3080                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3081                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3082
3083                 /*
3084                  * Ok we have num_eligible_addr set with how many we can
3085                  * use, this may vary from call to call due to addresses
3086                  * being deprecated etc..
3087                  */
3088                 if (cur_addr_num >= num_preferred) {
3089                         cur_addr_num = 0;
3090                 }
3091                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3092                     dest_is_priv, cur_addr_num, fam, ro);
3093                 if (sifa == NULL)
3094                         continue;
3095                 if (net) {
3096                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3098                             cur_addr_num);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3101                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3102                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3103                 }
3104                 atomic_add_int(&sifa->refcount, 1);
3105                 return (sifa);
3106         }
3107 #ifdef INET
3108 again_with_private_addresses_allowed:
3109 #endif
3110         /* plan_c: do we have an acceptable address on the emit interface */
3111         sifa = NULL;
3112         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3113         if (emit_ifn == NULL) {
3114                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3115                 goto plan_d;
3116         }
3117         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3118                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3119 #ifdef INET
3120                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3121                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3122                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3123                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3124                         continue;
3125                 }
3126 #endif
3127 #ifdef INET6
3128                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3129                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3130                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3132                         continue;
3133                 }
3134 #endif
3135                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3136                     (non_asoc_addr_ok == 0)) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3138                         continue;
3139                 }
3140                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3141                     dest_is_priv, fam);
3142                 if (sifa == NULL) {
3143                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3144                         continue;
3145                 }
3146                 if (stcb) {
3147                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3148                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3149                                 sifa = NULL;
3150                                 continue;
3151                         }
3152                         if (((non_asoc_addr_ok == 0) &&
3153                             (sctp_is_addr_restricted(stcb, sifa))) ||
3154                             (non_asoc_addr_ok &&
3155                             (sctp_is_addr_restricted(stcb, sifa)) &&
3156                             (!sctp_is_addr_pending(stcb, sifa)))) {
3157                                 /*
3158                                  * It is restricted for some reason..
3159                                  * probably not yet added.
3160                                  */
3161                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3162                                 sifa = NULL;
3163                                 continue;
3164                         }
3165                 }
3166                 atomic_add_int(&sifa->refcount, 1);
3167                 goto out;
3168         }
3169 plan_d:
3170         /*
3171          * plan_d: We are in trouble. No preferred address on the emit
3172          * interface. And not even a preferred address on all interfaces. Go
3173          * out and see if we can find an acceptable address somewhere
3174          * amongst all interfaces.
3175          */
3176         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179                         /* wrong base scope */
3180                         continue;
3181                 }
3182                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183 #ifdef INET
3184                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3187                                 continue;
3188                         }
3189 #endif
3190 #ifdef INET6
3191                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194                                 continue;
3195                         }
3196 #endif
3197                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198                             (non_asoc_addr_ok == 0))
3199                                 continue;
3200                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201                             dest_is_loop,
3202                             dest_is_priv, fam);
3203                         if (sifa == NULL)
3204                                 continue;
3205                         if (stcb) {
3206                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207                                         sifa = NULL;
3208                                         continue;
3209                                 }
3210                                 if (((non_asoc_addr_ok == 0) &&
3211                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3212                                     (non_asoc_addr_ok &&
3213                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3214                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3215                                         /*
3216                                          * It is restricted for some
3217                                          * reason.. probably not yet added.
3218                                          */
3219                                         sifa = NULL;
3220                                         continue;
3221                                 }
3222                         }
3223                         goto out;
3224                 }
3225         }
3226 #ifdef INET
3227         if (stcb) {
3228                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3229                         stcb->asoc.scope.ipv4_local_scope = 1;
3230                         retried = 1;
3231                         goto again_with_private_addresses_allowed;
3232                 } else if (retried == 1) {
3233                         stcb->asoc.scope.ipv4_local_scope = 0;
3234                 }
3235         }
3236 #endif
3237 out:
3238 #ifdef INET
3239         if (sifa) {
3240                 if (retried == 1) {
3241                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3242                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3243                                         /* wrong base scope */
3244                                         continue;
3245                                 }
3246                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3247                                         struct sctp_ifa *tmp_sifa;
3248
3249 #ifdef INET
3250                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3251                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3252                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3253                                                 continue;
3254                                         }
3255 #endif
3256 #ifdef INET6
3257                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3258                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3259                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3260                                                 continue;
3261                                         }
3262 #endif
3263                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3264                                             (non_asoc_addr_ok == 0))
3265                                                 continue;
3266                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3267                                             dest_is_loop,
3268                                             dest_is_priv, fam);
3269                                         if (tmp_sifa == NULL) {
3270                                                 continue;
3271                                         }
3272                                         if (tmp_sifa == sifa) {
3273                                                 continue;
3274                                         }
3275                                         if (stcb) {
3276                                                 if (sctp_is_address_in_scope(tmp_sifa,
3277                                                     &stcb->asoc.scope, 0) == 0) {
3278                                                         continue;
3279                                                 }
3280                                                 if (((non_asoc_addr_ok == 0) &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3282                                                     (non_asoc_addr_ok &&
3283                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3284                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3285                                                         /*
3286                                                          * It is restricted
3287                                                          * for some reason..
3288                                                          * probably not yet
3289                                                          * added.
3290                                                          */
3291                                                         continue;
3292                                                 }
3293                                         }
3294                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3295                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3296                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3297                                         }
3298                                 }
3299                         }
3300                 }
3301                 atomic_add_int(&sifa->refcount, 1);
3302         }
3303 #endif
3304         return (sifa);
3305 }
3306
3307
3308
3309 /* tcb may be NULL */
3310 struct sctp_ifa *
3311 sctp_source_address_selection(struct sctp_inpcb *inp,
3312     struct sctp_tcb *stcb,
3313     sctp_route_t *ro,
3314     struct sctp_nets *net,
3315     int non_asoc_addr_ok, uint32_t vrf_id)
3316 {
3317         struct sctp_ifa *answer;
3318         uint8_t dest_is_priv, dest_is_loop;
3319         sa_family_t fam;
3320 #ifdef INET
3321         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325 #endif
3326
3327         /**
3328          * Rules:
3329          * - Find the route if needed, cache if I can.
3330          * - Look at interface address in route, Is it in the bound list. If so we
3331          *   have the best source.
3332          * - If not we must rotate amongst the addresses.
3333          *
3334          * Cavets and issues
3335          *
3336          * Do we need to pay attention to scope. We can have a private address
3337          * or a global address we are sourcing or sending to. So if we draw
3338          * it out
3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340          * For V4
3341          * ------------------------------------------
3342          *      source     *      dest  *  result
3343          * -----------------------------------------
3344          * <a>  Private    *    Global  *  NAT
3345          * -----------------------------------------
3346          * <b>  Private    *    Private *  No problem
3347          * -----------------------------------------
3348          * <c>  Global     *    Private *  Huh, How will this work?
3349          * -----------------------------------------
3350          * <d>  Global     *    Global  *  No Problem
3351          *------------------------------------------
3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353          * For V6
3354          *------------------------------------------
3355          *      source     *      dest  *  result
3356          * -----------------------------------------
3357          * <a>  Linklocal  *    Global  *
3358          * -----------------------------------------
3359          * <b>  Linklocal  * Linklocal  *  No problem
3360          * -----------------------------------------
3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
3362          * -----------------------------------------
3363          * <d>  Global     *    Global  *  No Problem
3364          *------------------------------------------
3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366          *
3367          * And then we add to that what happens if there are multiple addresses
3368          * assigned to an interface. Remember the ifa on a ifn is a linked
3369          * list of addresses. So one interface can have more than one IP
3370          * address. What happens if we have both a private and a global
3371          * address? Do we then use context of destination to sort out which
3372          * one is best? And what about NAT's sending P->G may get you a NAT
3373          * translation, or should you select the G thats on the interface in
3374          * preference.
3375          *
3376          * Decisions:
3377          *
3378          * - count the number of addresses on the interface.
3379          * - if it is one, no problem except case <c>.
3380          *   For <a> we will assume a NAT out there.
3381          * - if there are more than one, then we need to worry about scope P
3382          *   or G. We should prefer G -> G and P -> P if possible.
3383          *   Then as a secondary fall back to mixed types G->P being a last
3384          *   ditch one.
3385          * - The above all works for bound all, but bound specific we need to
3386          *   use the same concept but instead only consider the bound
3387          *   addresses. If the bound set is NOT assigned to the interface then
3388          *   we must use rotation amongst the bound addresses..
3389          */
3390         if (ro->ro_rt == NULL) {
3391                 /*
3392                  * Need a route to cache.
3393                  */
3394                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3395         }
3396         if (ro->ro_rt == NULL) {
3397                 return (NULL);
3398         }
3399         fam = ro->ro_dst.sa_family;
3400         dest_is_priv = dest_is_loop = 0;
3401         /* Setup our scopes for the destination */
3402         switch (fam) {
3403 #ifdef INET
3404         case AF_INET:
3405                 /* Scope based on outbound address */
3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407                         dest_is_loop = 1;
3408                         if (net != NULL) {
3409                                 /* mark it as local */
3410                                 net->addr_is_local = 1;
3411                         }
3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413                         dest_is_priv = 1;
3414                 }
3415                 break;
3416 #endif
3417 #ifdef INET6
3418         case AF_INET6:
3419                 /* Scope based on outbound address */
3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422                         /*
3423                          * If the address is a loopback address, which
3424                          * consists of "::1" OR "fe80::1%lo0", we are
3425                          * loopback scope. But we don't use dest_is_priv
3426                          * (link local addresses).
3427                          */
3428                         dest_is_loop = 1;
3429                         if (net != NULL) {
3430                                 /* mark it as local */
3431                                 net->addr_is_local = 1;
3432                         }
3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434                         dest_is_priv = 1;
3435                 }
3436                 break;
3437 #endif
3438         }
3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441         SCTP_IPI_ADDR_RLOCK();
3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443                 /*
3444                  * Bound all case
3445                  */
3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447                     dest_is_priv, dest_is_loop,
3448                     non_asoc_addr_ok, fam);
3449                 SCTP_IPI_ADDR_RUNLOCK();
3450                 return (answer);
3451         }
3452         /*
3453          * Subset bound case
3454          */
3455         if (stcb) {
3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457                     vrf_id, dest_is_priv,
3458                     dest_is_loop,
3459                     non_asoc_addr_ok, fam);
3460         } else {
3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462                     non_asoc_addr_ok,
3463                     dest_is_priv,
3464                     dest_is_loop, fam);
3465         }
3466         SCTP_IPI_ADDR_RUNLOCK();
3467         return (answer);
3468 }
3469
3470 static int
3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472 {
3473         struct cmsghdr cmh;
3474         struct sctp_sndinfo sndinfo;
3475         struct sctp_prinfo prinfo;
3476         struct sctp_authinfo authinfo;
3477         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3478         int found;
3479
3480         /*
3481          * Independent of how many mbufs, find the c_type inside the control
3482          * structure and copy out the data.
3483          */
3484         found = 0;
3485         tot_len = SCTP_BUF_LEN(control);
3486         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3487                 rem_len = tot_len - off;
3488                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3489                         /* There is not enough room for one more. */
3490                         return (found);
3491                 }
3492                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494                         /* We dont't have a complete CMSG header. */
3495                         return (found);
3496                 }
3497                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3498                         /* We don't have the complete CMSG. */
3499                         return (found);
3500                 }
3501                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3502                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3503                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3504                     ((c_type == cmh.cmsg_type) ||
3505                     ((c_type == SCTP_SNDRCV) &&
3506                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3507                     (cmh.cmsg_type == SCTP_PRINFO) ||
3508                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3509                         if (c_type == cmh.cmsg_type) {
3510                                 if (cpsize > INT_MAX) {
3511                                         return (found);
3512                                 }
3513                                 if (cmsg_data_len < (int)cpsize) {
3514                                         return (found);
3515                                 }
3516                                 /* It is exactly what we want. Copy it out. */
3517                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3518                                 return (1);
3519                         } else {
3520                                 struct sctp_sndrcvinfo *sndrcvinfo;
3521
3522                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3523                                 if (found == 0) {
3524                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3525                                                 return (found);
3526                                         }
3527                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3528                                 }
3529                                 switch (cmh.cmsg_type) {
3530                                 case SCTP_SNDINFO:
3531                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3532                                                 return (found);
3533                                         }
3534                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3535                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3536                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3537                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3538                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3539                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3540                                         break;
3541                                 case SCTP_PRINFO:
3542                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3546                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3547                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3548                                         } else {
3549                                                 sndrcvinfo->sinfo_timetolive = 0;
3550                                         }
3551                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3552                                         break;
3553                                 case SCTP_AUTHINFO:
3554                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3555                                                 return (found);
3556                                         }
3557                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3558                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3559                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3560                                         break;
3561                                 default:
3562                                         return (found);
3563                                 }
3564                                 found = 1;
3565                         }
3566                 }
3567         }
3568         return (found);
3569 }
3570
3571 static int
3572 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3573 {
3574         struct cmsghdr cmh;
3575         struct sctp_initmsg initmsg;
3576 #ifdef INET
3577         struct sockaddr_in sin;
3578 #endif
3579 #ifdef INET6
3580         struct sockaddr_in6 sin6;
3581 #endif
3582         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3583
3584         tot_len = SCTP_BUF_LEN(control);
3585         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3586                 rem_len = tot_len - off;
3587                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3588                         /* There is not enough room for one more. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3593                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3594                         /* We dont't have a complete CMSG header. */
3595                         *error = EINVAL;
3596                         return (1);
3597                 }
3598                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3599                         /* We don't have the complete CMSG. */
3600                         *error = EINVAL;
3601                         return (1);
3602                 }
3603                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3604                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3605                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3606                         switch (cmh.cmsg_type) {
3607                         case SCTP_INIT:
3608                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3609                                         *error = EINVAL;
3610                                         return (1);
3611                                 }
3612                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3613                                 if (initmsg.sinit_max_attempts)
3614                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3615                                 if (initmsg.sinit_num_ostreams)
3616                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3617                                 if (initmsg.sinit_max_instreams)
3618                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3619                                 if (initmsg.sinit_max_init_timeo)
3620                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3621                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3622                                         struct sctp_stream_out *tmp_str;
3623                                         unsigned int i;
3624 #if defined(SCTP_DETAILED_STR_STATS)
3625                                         int j;
3626 #endif
3627
3628                                         /* Default is NOT correct */
3629                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3630                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3631                                         SCTP_TCB_UNLOCK(stcb);
3632                                         SCTP_MALLOC(tmp_str,
3633                                             struct sctp_stream_out *,
3634                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3635                                             SCTP_M_STRMO);
3636                                         SCTP_TCB_LOCK(stcb);
3637                                         if (tmp_str != NULL) {
3638                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3639                                                 stcb->asoc.strmout = tmp_str;
3640                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3641                                         } else {
3642                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3643                                         }
3644                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3645                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3646                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3647                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3648                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3649 #if defined(SCTP_DETAILED_STR_STATS)
3650                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3651                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3652                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3653                                                 }
3654 #else
3655                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3656                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3657 #endif
3658                                                 stcb->asoc.strmout[i].sid = i;
3659                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3660                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3661                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3662                                         }
3663                                 }
3664                                 break;
3665 #ifdef INET
3666                         case SCTP_DSTADDRV4:
3667                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3668                                         *error = EINVAL;
3669                                         return (1);
3670                                 }
3671                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3672                                 sin.sin_family = AF_INET;
3673                                 sin.sin_len = sizeof(struct sockaddr_in);
3674                                 sin.sin_port = stcb->rport;
3675                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3676                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3677                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3678                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3683                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3684                                         *error = ENOBUFS;
3685                                         return (1);
3686                                 }
3687                                 break;
3688 #endif
3689 #ifdef INET6
3690                         case SCTP_DSTADDRV6:
3691                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3692                                         *error = EINVAL;
3693                                         return (1);
3694                                 }
3695                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3696                                 sin6.sin6_family = AF_INET6;
3697                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3698                                 sin6.sin6_port = stcb->rport;
3699                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3700                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3701                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3702                                         *error = EINVAL;
3703                                         return (1);
3704                                 }
3705 #ifdef INET
3706                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3707                                         in6_sin6_2_sin(&sin, &sin6);
3708                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3709                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3710                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3711                                                 *error = EINVAL;
3712                                                 return (1);
3713                                         }
3714                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3715                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3716                                                 *error = ENOBUFS;
3717                                                 return (1);
3718                                         }
3719                                 } else
3720 #endif
3721                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3722                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3723                                         *error = ENOBUFS;
3724                                         return (1);
3725                                 }
3726                                 break;
3727 #endif
3728                         default:
3729                                 break;
3730                         }
3731                 }
3732         }
3733         return (0);
3734 }
3735
3736 #if defined(INET) || defined(INET6)
3737 static struct sctp_tcb *
3738 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3739     uint16_t port,
3740     struct mbuf *control,
3741     struct sctp_nets **net_p,
3742     int *error)
3743 {
3744         struct cmsghdr cmh;
3745         struct sctp_tcb *stcb;
3746         struct sockaddr *addr;
3747 #ifdef INET
3748         struct sockaddr_in sin;
3749 #endif
3750 #ifdef INET6
3751         struct sockaddr_in6 sin6;
3752 #endif
3753         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3754
3755         tot_len = SCTP_BUF_LEN(control);
3756         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3757                 rem_len = tot_len - off;
3758                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3759                         /* There is not enough room for one more. */
3760                         *error = EINVAL;
3761                         return (NULL);
3762                 }
3763                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3764                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3765                         /* We dont't have a complete CMSG header. */
3766                         *error = EINVAL;
3767                         return (NULL);
3768                 }
3769                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3770                         /* We don't have the complete CMSG. */
3771                         *error = EINVAL;
3772                         return (NULL);
3773                 }
3774                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3775                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3776                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3777                         switch (cmh.cmsg_type) {
3778 #ifdef INET
3779                         case SCTP_DSTADDRV4:
3780                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3781                                         *error = EINVAL;
3782                                         return (NULL);
3783                                 }
3784                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3785                                 sin.sin_family = AF_INET;
3786                                 sin.sin_len = sizeof(struct sockaddr_in);
3787                                 sin.sin_port = port;
3788                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3789                                 addr = (struct sockaddr *)&sin;
3790                                 break;
3791 #endif
3792 #ifdef INET6
3793                         case SCTP_DSTADDRV6:
3794                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3795                                         *error = EINVAL;
3796                                         return (NULL);
3797                                 }
3798                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3799                                 sin6.sin6_family = AF_INET6;
3800                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3801                                 sin6.sin6_port = port;
3802                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3803 #ifdef INET
3804                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3805                                         in6_sin6_2_sin(&sin, &sin6);
3806                                         addr = (struct sockaddr *)&sin;
3807                                 } else
3808 #endif
3809                                         addr = (struct sockaddr *)&sin6;
3810                                 break;
3811 #endif
3812                         default:
3813                                 addr = NULL;
3814                                 break;
3815                         }
3816                         if (addr) {
3817                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3818                                 if (stcb != NULL) {
3819                                         return (stcb);
3820                                 }
3821                         }
3822                 }
3823         }
3824         return (NULL);
3825 }
3826 #endif
3827
3828 static struct mbuf *
3829 sctp_add_cookie(struct mbuf *init, int init_offset,
3830     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3831 {
3832         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3833         struct sctp_state_cookie *stc;
3834         struct sctp_paramhdr *ph;
3835         uint8_t *foo;
3836         int sig_offset;
3837         uint16_t cookie_sz;
3838
3839         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3840             sizeof(struct sctp_paramhdr)), 0,
3841             M_NOWAIT, 1, MT_DATA);
3842         if (mret == NULL) {
3843                 return (NULL);
3844         }
3845         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3846         if (copy_init == NULL) {
3847                 sctp_m_freem(mret);
3848                 return (NULL);
3849         }
3850 #ifdef SCTP_MBUF_LOGGING
3851         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3852                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3853         }
3854 #endif
3855         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3856             M_NOWAIT);
3857         if (copy_initack == NULL) {
3858                 sctp_m_freem(mret);
3859                 sctp_m_freem(copy_init);
3860                 return (NULL);
3861         }
3862 #ifdef SCTP_MBUF_LOGGING
3863         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3864                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3865         }
3866 #endif
3867         /* easy side we just drop it on the end */
3868         ph = mtod(mret, struct sctp_paramhdr *);
3869         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3870             sizeof(struct sctp_paramhdr);
3871         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3872             sizeof(struct sctp_paramhdr));
3873         ph->param_type = htons(SCTP_STATE_COOKIE);
3874         ph->param_length = 0;   /* fill in at the end */
3875         /* Fill in the stc cookie data */
3876         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3877
3878         /* tack the INIT and then the INIT-ACK onto the chain */
3879         cookie_sz = 0;
3880         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881                 cookie_sz += SCTP_BUF_LEN(m_at);
3882                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3883                         SCTP_BUF_NEXT(m_at) = copy_init;
3884                         break;
3885                 }
3886         }
3887         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888                 cookie_sz += SCTP_BUF_LEN(m_at);
3889                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3890                         SCTP_BUF_NEXT(m_at) = copy_initack;
3891                         break;
3892                 }
3893         }
3894         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3895                 cookie_sz += SCTP_BUF_LEN(m_at);
3896                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3897                         break;
3898                 }
3899         }
3900         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3901         if (sig == NULL) {
3902                 /* no space, so free the entire chain */
3903                 sctp_m_freem(mret);
3904                 return (NULL);
3905         }
3906         SCTP_BUF_LEN(sig) = 0;
3907         SCTP_BUF_NEXT(m_at) = sig;
3908         sig_offset = 0;
3909         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3910         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3911         *signature = foo;
3912         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3913         cookie_sz += SCTP_SIGNATURE_SIZE;
3914         ph->param_length = htons(cookie_sz);
3915         return (mret);
3916 }
3917
3918
3919 static uint8_t
3920 sctp_get_ect(struct sctp_tcb *stcb)
3921 {
3922         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3923                 return (SCTP_ECT0_BIT);
3924         } else {
3925                 return (0);
3926         }
3927 }
3928
3929 #if defined(INET) || defined(INET6)
3930 static void
3931 sctp_handle_no_route(struct sctp_tcb *stcb,
3932     struct sctp_nets *net,
3933     int so_locked)
3934 {
3935         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3936
3937         if (net) {
3938                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3939                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3940                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3941                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3942                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3943                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3944                                     stcb, 0,
3945                                     (void *)net,
3946                                     so_locked);
3947                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3948                                 net->dest_state &= ~SCTP_ADDR_PF;
3949                         }
3950                 }
3951                 if (stcb) {
3952                         if (net == stcb->asoc.primary_destination) {
3953                                 /* need a new primary */
3954                                 struct sctp_nets *alt;
3955
3956                                 alt = sctp_find_alternate_net(stcb, net, 0);
3957                                 if (alt != net) {
3958                                         if (stcb->asoc.alternate) {
3959                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3960                                         }
3961                                         stcb->asoc.alternate = alt;
3962                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3963                                         if (net->ro._s_addr) {
3964                                                 sctp_free_ifa(net->ro._s_addr);
3965                                                 net->ro._s_addr = NULL;
3966                                         }
3967                                         net->src_addr_selected = 0;
3968                                 }
3969                         }
3970                 }
3971         }
3972 }
3973 #endif
3974
3975 static int
3976 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3977     struct sctp_tcb *stcb,      /* may be NULL */
3978     struct sctp_nets *net,
3979     struct sockaddr *to,
3980     struct mbuf *m,
3981     uint32_t auth_offset,
3982     struct sctp_auth_chunk *auth,
3983     uint16_t auth_keyid,
3984     int nofragment_flag,
3985     int ecn_ok,
3986     int out_of_asoc_ok,
3987     uint16_t src_port,
3988     uint16_t dest_port,
3989     uint32_t v_tag,
3990     uint16_t port,
3991     union sctp_sockstore *over_addr,
3992     uint8_t mflowtype, uint32_t mflowid,
3993 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3994     int so_locked SCTP_UNUSED
3995 #else
3996     int so_locked
3997 #endif
3998 )
3999 {
4000 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4001         /**
4002          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4003          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4004          * - fill in the HMAC digest of any AUTH chunk in the packet.
4005          * - calculate and fill in the SCTP checksum.
4006          * - prepend an IP address header.
4007          * - if boundall use INADDR_ANY.
4008          * - if boundspecific do source address selection.
4009          * - set fragmentation option for ipV4.
4010          * - On return from IP output, check/adjust mtu size of output
4011          *   interface and smallest_mtu size as well.
4012          */
4013         /* Will need ifdefs around this */
4014         struct mbuf *newm;
4015         struct sctphdr *sctphdr;
4016         int packet_length;
4017         int ret;
4018 #if defined(INET) || defined(INET6)
4019         uint32_t vrf_id;
4020 #endif
4021 #if defined(INET) || defined(INET6)
4022         struct mbuf *o_pak;
4023         sctp_route_t *ro = NULL;
4024         struct udphdr *udp = NULL;
4025 #endif
4026         uint8_t tos_value;
4027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028         struct socket *so = NULL;
4029 #endif
4030
4031         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4032                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4033                 sctp_m_freem(m);
4034                 return (EFAULT);
4035         }
4036 #if defined(INET) || defined(INET6)
4037         if (stcb) {
4038                 vrf_id = stcb->asoc.vrf_id;
4039         } else {
4040                 vrf_id = inp->def_vrf_id;
4041         }
4042 #endif
4043         /* fill in the HMAC digest for any AUTH chunk in the packet */
4044         if ((auth != NULL) && (stcb != NULL)) {
4045                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4046         }
4047
4048         if (net) {
4049                 tos_value = net->dscp;
4050         } else if (stcb) {
4051                 tos_value = stcb->asoc.default_dscp;
4052         } else {
4053                 tos_value = inp->sctp_ep.default_dscp;
4054         }
4055
4056         switch (to->sa_family) {
4057 #ifdef INET
4058         case AF_INET:
4059                 {
4060                         struct ip *ip = NULL;
4061                         sctp_route_t iproute;
4062                         int len;
4063
4064                         len = SCTP_MIN_V4_OVERHEAD;
4065                         if (port) {
4066                                 len += sizeof(struct udphdr);
4067                         }
4068                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069                         if (newm == NULL) {
4070                                 sctp_m_freem(m);
4071                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072                                 return (ENOMEM);
4073                         }
4074                         SCTP_ALIGN_TO_END(newm, len);
4075                         SCTP_BUF_LEN(newm) = len;
4076                         SCTP_BUF_NEXT(newm) = m;
4077                         m = newm;
4078                         if (net != NULL) {
4079                                 m->m_pkthdr.flowid = net->flowid;
4080                                 M_HASHTYPE_SET(m, net->flowtype);
4081                         } else {
4082                                 m->m_pkthdr.flowid = mflowid;
4083                                 M_HASHTYPE_SET(m, mflowtype);
4084                         }
4085                         packet_length = sctp_calculate_len(m);
4086                         ip = mtod(m, struct ip *);
4087                         ip->ip_v = IPVERSION;
4088                         ip->ip_hl = (sizeof(struct ip) >> 2);
4089                         if (tos_value == 0) {
4090                                 /*
4091                                  * This means especially, that it is not set
4092                                  * at the SCTP layer. So use the value from
4093                                  * the IP layer.
4094                                  */
4095                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4096                         }
4097                         tos_value &= 0xfc;
4098                         if (ecn_ok) {
4099                                 tos_value |= sctp_get_ect(stcb);
4100                         }
4101                         if ((nofragment_flag) && (port == 0)) {
4102                                 ip->ip_off = htons(IP_DF);
4103                         } else {
4104                                 ip->ip_off = htons(0);
4105                         }
4106                         /* FreeBSD has a function for ip_id's */
4107                         ip_fillid(ip);
4108
4109                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4110                         ip->ip_len = htons(packet_length);
4111                         ip->ip_tos = tos_value;
4112                         if (port) {
4113                                 ip->ip_p = IPPROTO_UDP;
4114                         } else {
4115                                 ip->ip_p = IPPROTO_SCTP;
4116                         }
4117                         ip->ip_sum = 0;
4118                         if (net == NULL) {
4119                                 ro = &iproute;
4120                                 memset(&iproute, 0, sizeof(iproute));
4121                                 memcpy(&ro->ro_dst, to, to->sa_len);
4122                         } else {
4123                                 ro = (sctp_route_t *)&net->ro;
4124                         }
4125                         /* Now the address selection part */
4126                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4127
4128                         /* call the routine to select the src address */
4129                         if (net && out_of_asoc_ok == 0) {
4130                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4131                                         sctp_free_ifa(net->ro._s_addr);
4132                                         net->ro._s_addr = NULL;
4133                                         net->src_addr_selected = 0;
4134                                         if (ro->ro_rt) {
4135                                                 RTFREE(ro->ro_rt);
4136                                                 ro->ro_rt = NULL;
4137                                         }
4138                                 }
4139                                 if (net->src_addr_selected == 0) {
4140                                         /* Cache the source address */
4141                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4142                                             ro, net, 0,
4143                                             vrf_id);
4144                                         net->src_addr_selected = 1;
4145                                 }
4146                                 if (net->ro._s_addr == NULL) {
4147                                         /* No route to host */
4148                                         net->src_addr_selected = 0;
4149                                         sctp_handle_no_route(stcb, net, so_locked);
4150                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4151                                         sctp_m_freem(m);
4152                                         return (EHOSTUNREACH);
4153                                 }
4154                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4155                         } else {
4156                                 if (over_addr == NULL) {
4157                                         struct sctp_ifa *_lsrc;
4158
4159                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4160                                             net,
4161                                             out_of_asoc_ok,
4162                                             vrf_id);
4163                                         if (_lsrc == NULL) {
4164                                                 sctp_handle_no_route(stcb, net, so_locked);
4165                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4166                                                 sctp_m_freem(m);
4167                                                 return (EHOSTUNREACH);
4168                                         }
4169                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4170                                         sctp_free_ifa(_lsrc);
4171                                 } else {
4172                                         ip->ip_src = over_addr->sin.sin_addr;
4173                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4174                                 }
4175                         }
4176                         if (port) {
4177                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4178                                         sctp_handle_no_route(stcb, net, so_locked);
4179                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4180                                         sctp_m_freem(m);
4181                                         return (EHOSTUNREACH);
4182                                 }
4183                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4184                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4185                                 udp->uh_dport = port;
4186                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4187                                 if (V_udp_cksum) {
4188                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4189                                 } else {
4190                                         udp->uh_sum = 0;
4191                                 }
4192                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4193                         } else {
4194                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4195                         }
4196
4197                         sctphdr->src_port = src_port;
4198                         sctphdr->dest_port = dest_port;
4199                         sctphdr->v_tag = v_tag;
4200                         sctphdr->checksum = 0;
4201
4202                         /*
4203                          * If source address selection fails and we find no
4204                          * route then the ip_output should fail as well with
4205                          * a NO_ROUTE_TO_HOST type error. We probably should
4206                          * catch that somewhere and abort the association
4207                          * right away (assuming this is an INIT being sent).
4208                          */
4209                         if (ro->ro_rt == NULL) {
4210                                 /*
4211                                  * src addr selection failed to find a route
4212                                  * (or valid source addr), so we can't get
4213                                  * there from here (yet)!
4214                                  */
4215                                 sctp_handle_no_route(stcb, net, so_locked);
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4217                                 sctp_m_freem(m);
4218                                 return (EHOSTUNREACH);
4219                         }
4220                         if (ro != &iproute) {
4221                                 memcpy(&iproute, ro, sizeof(*ro));
4222                         }
4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4224                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4225                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4226                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4227                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4228                             (void *)ro->ro_rt);
4229
4230                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4231                                 /* failed to prepend data, give up */
4232                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4233                                 sctp_m_freem(m);
4234                                 return (ENOMEM);
4235                         }
4236                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4237                         if (port) {
4238                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4239                                 SCTP_STAT_INCR(sctps_sendswcrc);
4240                                 if (V_udp_cksum) {
4241                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4242                                 }
4243                         } else {
4244                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4245                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4246                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4247                         }
4248 #ifdef SCTP_PACKET_LOGGING
4249                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4250                                 sctp_packet_log(o_pak);
4251 #endif
4252                         /* send it out.  table id is taken from stcb */
4253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4254                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4255                                 so = SCTP_INP_SO(inp);
4256                                 SCTP_SOCKET_UNLOCK(so, 0);
4257                         }
4258 #endif
4259                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4260                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4262                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4263                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4264                                 SCTP_TCB_UNLOCK(stcb);
4265                                 SCTP_SOCKET_LOCK(so, 0);
4266                                 SCTP_TCB_LOCK(stcb);
4267                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4268                         }
4269 #endif
4270                         if (port) {
4271                                 UDPSTAT_INC(udps_opackets);
4272                         }
4273                         SCTP_STAT_INCR(sctps_sendpackets);
4274                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4275                         if (ret)
4276                                 SCTP_STAT_INCR(sctps_senderrors);
4277
4278                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4279                         if (net == NULL) {
4280                                 /* free tempy routes */
4281                                 RO_RTFREE(ro);
4282                         } else {
4283                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4284                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4285                                         uint32_t mtu;
4286
4287                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4288                                         if (mtu > 0) {
4289                                                 if (net->port) {
4290                                                         mtu -= sizeof(struct udphdr);
4291                                                 }
4292                                                 if (mtu < net->mtu) {
4293                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4294                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4295                                                         }
4296                                                         net->mtu = mtu;
4297                                                 }
4298                                         }
4299                                 } else if (ro->ro_rt == NULL) {
4300                                         /* route was freed */
4301                                         if (net->ro._s_addr &&
4302                                             net->src_addr_selected) {
4303                                                 sctp_free_ifa(net->ro._s_addr);
4304                                                 net->ro._s_addr = NULL;
4305                                         }
4306                                         net->src_addr_selected = 0;
4307                                 }
4308                         }
4309                         return (ret);
4310                 }
4311 #endif
4312 #ifdef INET6
4313         case AF_INET6:
4314                 {
4315                         uint32_t flowlabel, flowinfo;
4316                         struct ip6_hdr *ip6h;
4317                         struct route_in6 ip6route;
4318                         struct ifnet *ifp;
4319                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4320                         int prev_scope = 0;
4321                         struct sockaddr_in6 lsa6_storage;
4322                         int error;
4323                         u_short prev_port = 0;
4324                         int len;
4325
4326                         if (net) {
4327                                 flowlabel = net->flowlabel;
4328                         } else if (stcb) {
4329                                 flowlabel = stcb->asoc.default_flowlabel;
4330                         } else {
4331                                 flowlabel = inp->sctp_ep.default_flowlabel;
4332                         }
4333                         if (flowlabel == 0) {
4334                                 /*
4335                                  * This means especially, that it is not set
4336                                  * at the SCTP layer. So use the value from
4337                                  * the IP layer.
4338                                  */
4339                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4340                         }
4341                         flowlabel &= 0x000fffff;
4342                         len = SCTP_MIN_OVERHEAD;
4343                         if (port) {
4344                                 len += sizeof(struct udphdr);
4345                         }
4346                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4347                         if (newm == NULL) {
4348                                 sctp_m_freem(m);
4349                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4350                                 return (ENOMEM);
4351                         }
4352                         SCTP_ALIGN_TO_END(newm, len);
4353                         SCTP_BUF_LEN(newm) = len;
4354                         SCTP_BUF_NEXT(newm) = m;
4355                         m = newm;
4356                         if (net != NULL) {
4357                                 m->m_pkthdr.flowid = net->flowid;
4358                                 M_HASHTYPE_SET(m, net->flowtype);
4359                         } else {
4360                                 m->m_pkthdr.flowid = mflowid;
4361                                 M_HASHTYPE_SET(m, mflowtype);
4362                         }
4363                         packet_length = sctp_calculate_len(m);
4364
4365                         ip6h = mtod(m, struct ip6_hdr *);
4366                         /* protect *sin6 from overwrite */
4367                         sin6 = (struct sockaddr_in6 *)to;
4368                         tmp = *sin6;
4369                         sin6 = &tmp;
4370
4371                         /* KAME hack: embed scopeid */
4372                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4373                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4374                                 sctp_m_freem(m);
4375                                 return (EINVAL);
4376                         }
4377                         if (net == NULL) {
4378                                 memset(&ip6route, 0, sizeof(ip6route));
4379                                 ro = (sctp_route_t *)&ip6route;
4380                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4381                         } else {
4382                                 ro = (sctp_route_t *)&net->ro;
4383                         }
4384                         /*
4385                          * We assume here that inp_flow is in host byte
4386                          * order within the TCB!
4387                          */
4388                         if (tos_value == 0) {
4389                                 /*
4390                                  * This means especially, that it is not set
4391                                  * at the SCTP layer. So use the value from
4392                                  * the IP layer.
4393                                  */
4394                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4395                         }
4396                         tos_value &= 0xfc;
4397                         if (ecn_ok) {
4398                                 tos_value |= sctp_get_ect(stcb);
4399                         }
4400                         flowinfo = 0x06;
4401                         flowinfo <<= 8;
4402                         flowinfo |= tos_value;
4403                         flowinfo <<= 20;
4404                         flowinfo |= flowlabel;
4405                         ip6h->ip6_flow = htonl(flowinfo);
4406                         if (port) {
4407                                 ip6h->ip6_nxt = IPPROTO_UDP;
4408                         } else {
4409                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4410                         }
4411                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4412                         ip6h->ip6_dst = sin6->sin6_addr;
4413
4414                         /*
4415                          * Add SRC address selection here: we can only reuse
4416                          * to a limited degree the kame src-addr-sel, since
4417                          * we can try their selection but it may not be
4418                          * bound.
4419                          */
4420                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4421                         lsa6_tmp.sin6_family = AF_INET6;
4422                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4423                         lsa6 = &lsa6_tmp;
4424                         if (net && out_of_asoc_ok == 0) {
4425                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4426                                         sctp_free_ifa(net->ro._s_addr);
4427                                         net->ro._s_addr = NULL;
4428                                         net->src_addr_selected = 0;
4429                                         if (ro->ro_rt) {
4430                                                 RTFREE(ro->ro_rt);
4431                                                 ro->ro_rt = NULL;
4432                                         }
4433                                 }
4434                                 if (net->src_addr_selected == 0) {
4435                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4436                                         /* KAME hack: embed scopeid */
4437                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4438                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4439                                                 sctp_m_freem(m);
4440                                                 return (EINVAL);
4441                                         }
4442                                         /* Cache the source address */
4443                                         net->ro._s_addr = sctp_source_address_selection(inp,
4444                                             stcb,
4445                                             ro,
4446                                             net,
4447                                             0,
4448                                             vrf_id);
4449                                         (void)sa6_recoverscope(sin6);
4450                                         net->src_addr_selected = 1;
4451                                 }
4452                                 if (net->ro._s_addr == NULL) {
4453                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4454                                         net->src_addr_selected = 0;
4455                                         sctp_handle_no_route(stcb, net, so_locked);
4456                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4457                                         sctp_m_freem(m);
4458                                         return (EHOSTUNREACH);
4459                                 }
4460                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4461                         } else {
4462                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4463                                 /* KAME hack: embed scopeid */
4464                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4465                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4466                                         sctp_m_freem(m);
4467                                         return (EINVAL);
4468                                 }
4469                                 if (over_addr == NULL) {
4470                                         struct sctp_ifa *_lsrc;
4471
4472                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4473                                             net,
4474                                             out_of_asoc_ok,
4475                                             vrf_id);
4476                                         if (_lsrc == NULL) {
4477                                                 sctp_handle_no_route(stcb, net, so_locked);
4478                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4479                                                 sctp_m_freem(m);
4480                                                 return (EHOSTUNREACH);
4481                                         }
4482                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4483                                         sctp_free_ifa(_lsrc);
4484                                 } else {
4485                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4486                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4487                                 }
4488                                 (void)sa6_recoverscope(sin6);
4489                         }
4490                         lsa6->sin6_port = inp->sctp_lport;
4491
4492                         if (ro->ro_rt == NULL) {
4493                                 /*
4494                                  * src addr selection failed to find a route
4495                                  * (or valid source addr), so we can't get
4496                                  * there from here!
4497                                  */
4498                                 sctp_handle_no_route(stcb, net, so_locked);
4499                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4500                                 sctp_m_freem(m);
4501                                 return (EHOSTUNREACH);
4502                         }
4503                         /*
4504                          * XXX: sa6 may not have a valid sin6_scope_id in
4505                          * the non-SCOPEDROUTING case.
4506                          */
4507                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4508                         lsa6_storage.sin6_family = AF_INET6;
4509                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4510                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4511                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4512                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4513                                 sctp_m_freem(m);
4514                                 return (error);
4515                         }
4516                         /* XXX */
4517                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4518                         lsa6_storage.sin6_port = inp->sctp_lport;
4519                         lsa6 = &lsa6_storage;
4520                         ip6h->ip6_src = lsa6->sin6_addr;
4521
4522                         if (port) {
4523                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4524                                         sctp_handle_no_route(stcb, net, so_locked);
4525                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4526                                         sctp_m_freem(m);
4527                                         return (EHOSTUNREACH);
4528                                 }
4529                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4530                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4531                                 udp->uh_dport = port;
4532                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4533                                 udp->uh_sum = 0;
4534                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4535                         } else {
4536                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4537                         }
4538
4539                         sctphdr->src_port = src_port;
4540                         sctphdr->dest_port = dest_port;
4541                         sctphdr->v_tag = v_tag;
4542                         sctphdr->checksum = 0;
4543
4544                         /*
4545                          * We set the hop limit now since there is a good
4546                          * chance that our ro pointer is now filled
4547                          */
4548                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4549                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4550
4551 #ifdef SCTP_DEBUG
4552                         /* Copy to be sure something bad is not happening */
4553                         sin6->sin6_addr = ip6h->ip6_dst;
4554                         lsa6->sin6_addr = ip6h->ip6_src;
4555 #endif
4556
4557                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4558                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4559                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4560                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4561                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4562                         if (net) {
4563                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4564                                 /*
4565                                  * preserve the port and scope for link
4566                                  * local send
4567                                  */
4568                                 prev_scope = sin6->sin6_scope_id;
4569                                 prev_port = sin6->sin6_port;
4570                         }
4571
4572                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4573                                 /* failed to prepend data, give up */
4574                                 sctp_m_freem(m);
4575                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4576                                 return (ENOMEM);
4577                         }
4578                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4579                         if (port) {
4580                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4581                                 SCTP_STAT_INCR(sctps_sendswcrc);
4582                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4583                                         udp->uh_sum = 0xffff;
4584                                 }
4585                         } else {
4586                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4587                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4588                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4589                         }
4590                         /* send it out. table id is taken from stcb */
4591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4592                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4593                                 so = SCTP_INP_SO(inp);
4594                                 SCTP_SOCKET_UNLOCK(so, 0);
4595                         }
4596 #endif
4597 #ifdef SCTP_PACKET_LOGGING
4598                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4599                                 sctp_packet_log(o_pak);
4600 #endif
4601                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4602                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4604                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4605                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4606                                 SCTP_TCB_UNLOCK(stcb);
4607                                 SCTP_SOCKET_LOCK(so, 0);
4608                                 SCTP_TCB_LOCK(stcb);
4609                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4610                         }
4611 #endif
4612                         if (net) {
4613                                 /* for link local this must be done */
4614                                 sin6->sin6_scope_id = prev_scope;
4615                                 sin6->sin6_port = prev_port;
4616                         }
4617                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4618                         if (port) {
4619                                 UDPSTAT_INC(udps_opackets);
4620                         }
4621                         SCTP_STAT_INCR(sctps_sendpackets);
4622                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4623                         if (ret) {
4624                                 SCTP_STAT_INCR(sctps_senderrors);
4625                         }
4626                         if (net == NULL) {
4627                                 /* Now if we had a temp route free it */
4628                                 RO_RTFREE(ro);
4629                         } else {
4630                                 /*
4631                                  * PMTU check versus smallest asoc MTU goes
4632                                  * here
4633                                  */
4634                                 if (ro->ro_rt == NULL) {
4635                                         /* Route was freed */
4636                                         if (net->ro._s_addr &&
4637                                             net->src_addr_selected) {
4638                                                 sctp_free_ifa(net->ro._s_addr);
4639                                                 net->ro._s_addr = NULL;
4640                                         }
4641                                         net->src_addr_selected = 0;
4642                                 }
4643                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4644                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4645                                         uint32_t mtu;
4646
4647                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4648                                         if (mtu > 0) {
4649                                                 if (net->port) {
4650                                                         mtu -= sizeof(struct udphdr);
4651                                                 }
4652                                                 if (mtu < net->mtu) {
4653                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4654                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4655                                                         }
4656                                                         net->mtu = mtu;
4657                                                 }
4658                                         }
4659                                 } else if (ifp) {
4660                                         if (ND_IFINFO(ifp)->linkmtu &&
4661                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4662                                                 sctp_mtu_size_reset(inp,
4663                                                     &stcb->asoc,
4664                                                     ND_IFINFO(ifp)->linkmtu);
4665                                         }
4666                                 }
4667                         }
4668                         return (ret);
4669                 }
4670 #endif
4671         default:
4672                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4673                     ((struct sockaddr *)to)->sa_family);
4674                 sctp_m_freem(m);
4675                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4676                 return (EFAULT);
4677         }
4678 }
4679
4680
4681 void
4682 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4683 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4684     SCTP_UNUSED
4685 #endif
4686 )
4687 {
4688         struct mbuf *m, *m_last;
4689         struct sctp_nets *net;
4690         struct sctp_init_chunk *init;
4691         struct sctp_supported_addr_param *sup_addr;
4692         struct sctp_adaptation_layer_indication *ali;
4693         struct sctp_supported_chunk_types_param *pr_supported;
4694         struct sctp_paramhdr *ph;
4695         int cnt_inits_to = 0;
4696         int error;
4697         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4698
4699         /* INIT's always go to the primary (and usually ONLY address) */
4700         net = stcb->asoc.primary_destination;
4701         if (net == NULL) {
4702                 net = TAILQ_FIRST(&stcb->asoc.nets);
4703                 if (net == NULL) {
4704                         /* TSNH */
4705                         return;
4706                 }
4707                 /* we confirm any address we send an INIT to */
4708                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4709                 (void)sctp_set_primary_addr(stcb, NULL, net);
4710         } else {
4711                 /* we confirm any address we send an INIT to */
4712                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4713         }
4714         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4715 #ifdef INET6
4716         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4717                 /*
4718                  * special hook, if we are sending to link local it will not
4719                  * show up in our private address count.
4720                  */
4721                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4722                         cnt_inits_to = 1;
4723         }
4724 #endif
4725         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4726                 /* This case should not happen */
4727                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4728                 return;
4729         }
4730         /* start the INIT timer */
4731         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4732
4733         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4734         if (m == NULL) {
4735                 /* No memory, INIT timer will re-attempt. */
4736                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4737                 return;
4738         }
4739         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4740         padding_len = 0;
4741         /* Now lets put the chunk header in place */
4742         init = mtod(m, struct sctp_init_chunk *);
4743         /* now the chunk header */
4744         init->ch.chunk_type = SCTP_INITIATION;
4745         init->ch.chunk_flags = 0;
4746         /* fill in later from mbuf we build */
4747         init->ch.chunk_length = 0;
4748         /* place in my tag */
4749         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4750         /* set up some of the credits. */
4751         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4752             SCTP_MINIMAL_RWND));
4753         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4754         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4755         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4756
4757         /* Adaptation layer indication parameter */
4758         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4759                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4760                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4761                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4762                 ali->ph.param_length = htons(parameter_len);
4763                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4764                 chunk_len += parameter_len;
4765         }
4766
4767         /* ECN parameter */
4768         if (stcb->asoc.ecn_supported == 1) {
4769                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4772                 ph->param_length = htons(parameter_len);
4773                 chunk_len += parameter_len;
4774         }
4775
4776         /* PR-SCTP supported parameter */
4777         if (stcb->asoc.prsctp_supported == 1) {
4778                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4779                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4780                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4781                 ph->param_length = htons(parameter_len);
4782                 chunk_len += parameter_len;
4783         }
4784
4785         /* Add NAT friendly parameter. */
4786         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4787                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4788                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4789                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4790                 ph->param_length = htons(parameter_len);
4791                 chunk_len += parameter_len;
4792         }
4793
4794         /* And now tell the peer which extensions we support */
4795         num_ext = 0;
4796         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4797         if (stcb->asoc.prsctp_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4799                 if (stcb->asoc.idata_supported) {
4800                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4801                 }
4802         }
4803         if (stcb->asoc.auth_supported == 1) {
4804                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4805         }
4806         if (stcb->asoc.asconf_supported == 1) {
4807                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4808                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4809         }
4810         if (stcb->asoc.reconfig_supported == 1) {
4811                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4812         }
4813         if (stcb->asoc.idata_supported) {
4814                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4815         }
4816         if (stcb->asoc.nrsack_supported == 1) {
4817                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4818         }
4819         if (stcb->asoc.pktdrop_supported == 1) {
4820                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4821         }
4822         if (num_ext > 0) {
4823                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4824                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4825                 pr_supported->ph.param_length = htons(parameter_len);
4826                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4827                 chunk_len += parameter_len;
4828         }
4829         /* add authentication parameters */
4830         if (stcb->asoc.auth_supported) {
4831                 /* attach RANDOM parameter, if available */
4832                 if (stcb->asoc.authinfo.random != NULL) {
4833                         struct sctp_auth_random *randp;
4834
4835                         if (padding_len > 0) {
4836                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4837                                 chunk_len += padding_len;
4838                                 padding_len = 0;
4839                         }
4840                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4841                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4842                         /* random key already contains the header */
4843                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4844                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4845                         chunk_len += parameter_len;
4846                 }
4847                 /* add HMAC_ALGO parameter */
4848                 if (stcb->asoc.local_hmacs != NULL) {
4849                         struct sctp_auth_hmac_algo *hmacs;
4850
4851                         if (padding_len > 0) {
4852                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4853                                 chunk_len += padding_len;
4854                                 padding_len = 0;
4855                         }
4856                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4857                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4858                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4859                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4860                         hmacs->ph.param_length = htons(parameter_len);
4861                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4862                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4863                         chunk_len += parameter_len;
4864                 }
4865                 /* add CHUNKS parameter */
4866                 if (stcb->asoc.local_auth_chunks != NULL) {
4867                         struct sctp_auth_chunk_list *chunks;
4868
4869                         if (padding_len > 0) {
4870                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871                                 chunk_len += padding_len;
4872                                 padding_len = 0;
4873                         }
4874                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4875                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4876                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4877                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4878                         chunks->ph.param_length = htons(parameter_len);
4879                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4880                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4881                         chunk_len += parameter_len;
4882                 }
4883         }
4884
4885         /* now any cookie time extensions */
4886         if (stcb->asoc.cookie_preserve_req) {
4887                 struct sctp_cookie_perserve_param *cookie_preserve;
4888
4889                 if (padding_len > 0) {
4890                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4891                         chunk_len += padding_len;
4892                         padding_len = 0;
4893                 }
4894                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4895                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4896                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4897                 cookie_preserve->ph.param_length = htons(parameter_len);
4898                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4899                 stcb->asoc.cookie_preserve_req = 0;
4900                 chunk_len += parameter_len;
4901         }
4902
4903         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4904                 uint8_t i;
4905
4906                 if (padding_len > 0) {
4907                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4908                         chunk_len += padding_len;
4909                         padding_len = 0;
4910                 }
4911                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4912                 if (stcb->asoc.scope.ipv4_addr_legal) {
4913                         parameter_len += (uint16_t)sizeof(uint16_t);
4914                 }
4915                 if (stcb->asoc.scope.ipv6_addr_legal) {
4916                         parameter_len += (uint16_t)sizeof(uint16_t);
4917                 }
4918                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4919                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4920                 sup_addr->ph.param_length = htons(parameter_len);
4921                 i = 0;
4922                 if (stcb->asoc.scope.ipv4_addr_legal) {
4923                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4924                 }
4925                 if (stcb->asoc.scope.ipv6_addr_legal) {
4926                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4927                 }
4928                 padding_len = 4 - 2 * i;
4929                 chunk_len += parameter_len;
4930         }
4931
4932         SCTP_BUF_LEN(m) = chunk_len;
4933         /* now the addresses */
4934         /*
4935          * To optimize this we could put the scoping stuff into a structure
4936          * and remove the individual uint8's from the assoc structure. Then
4937          * we could just sifa in the address within the stcb. But for now
4938          * this is a quick hack to get the address stuff teased apart.
4939          */
4940         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4941             m, cnt_inits_to,
4942             &padding_len, &chunk_len);
4943
4944         init->ch.chunk_length = htons(chunk_len);
4945         if (padding_len > 0) {
4946                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4947                         sctp_m_freem(m);
4948                         return;
4949                 }
4950         }
4951         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4952         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4953             (struct sockaddr *)&net->ro._l_addr,
4954             m, 0, NULL, 0, 0, 0, 0,
4955             inp->sctp_lport, stcb->rport, htonl(0),
4956             net->port, NULL,
4957             0, 0,
4958             so_locked))) {
4959                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4960                 if (error == ENOBUFS) {
4961                         stcb->asoc.ifp_had_enobuf = 1;
4962                         SCTP_STAT_INCR(sctps_lowlevelerr);
4963                 }
4964         } else {
4965                 stcb->asoc.ifp_had_enobuf = 0;
4966         }
4967         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4968         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4969 }
4970
4971 struct mbuf *
4972 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4973     int param_offset, int *abort_processing,
4974     struct sctp_chunkhdr *cp,
4975     int *nat_friendly,
4976     int *cookie_found)
4977 {
4978         /*
4979          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4980          * being equal to the beginning of the params i.e. (iphlen +
4981          * sizeof(struct sctp_init_msg) parse through the parameters to the
4982          * end of the mbuf verifying that all parameters are known.
4983          *
4984          * For unknown parameters build and return a mbuf with
4985          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4986          * processing this chunk stop, and set *abort_processing to 1.
4987          *
4988          * By having param_offset be pre-set to where parameters begin it is
4989          * hoped that this routine may be reused in the future by new
4990          * features.
4991          */
4992         struct sctp_paramhdr *phdr, params;
4993
4994         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4995         int at, limit, pad_needed;
4996         uint16_t ptype, plen, padded_size;
4997
4998         *abort_processing = 0;
4999         if (cookie_found != NULL) {
5000                 *cookie_found = 0;
5001         }
5002         mat = in_initpkt;
5003         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5004         at = param_offset;
5005         op_err = NULL;
5006         op_err_last = NULL;
5007         pad_needed = 0;
5008         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5009         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5010         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5011                 ptype = ntohs(phdr->param_type);
5012                 plen = ntohs(phdr->param_length);
5013                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5014                         /* wacked parameter */
5015                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5016                         goto invalid_size;
5017                 }
5018                 limit -= SCTP_SIZE32(plen);
5019                 /*-
5020                  * All parameters for all chunks that we know/understand are
5021                  * listed here. We process them other places and make
5022                  * appropriate stop actions per the upper bits. However this
5023                  * is the generic routine processor's can call to get back
5024                  * an operr.. to either incorporate (init-ack) or send.
5025                  */
5026                 padded_size = SCTP_SIZE32(plen);
5027                 switch (ptype) {
5028                         /* Param's with variable size */
5029                 case SCTP_HEARTBEAT_INFO:
5030                 case SCTP_UNRECOG_PARAM:
5031                 case SCTP_ERROR_CAUSE_IND:
5032                         /* ok skip fwd */
5033                         at += padded_size;
5034                         break;
5035                 case SCTP_STATE_COOKIE:
5036                         if (cookie_found != NULL) {
5037                                 *cookie_found = 1;
5038                         }
5039                         at += padded_size;
5040                         break;
5041                         /* Param's with variable size within a range */
5042                 case SCTP_CHUNK_LIST:
5043                 case SCTP_SUPPORTED_CHUNK_EXT:
5044                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5045                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5046                                 goto invalid_size;
5047                         }
5048                         at += padded_size;
5049                         break;
5050                 case SCTP_SUPPORTED_ADDRTYPE:
5051                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5053                                 goto invalid_size;
5054                         }
5055                         at += padded_size;
5056                         break;
5057                 case SCTP_RANDOM:
5058                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5060                                 goto invalid_size;
5061                         }
5062                         at += padded_size;
5063                         break;
5064                 case SCTP_SET_PRIM_ADDR:
5065                 case SCTP_DEL_IP_ADDRESS:
5066                 case SCTP_ADD_IP_ADDRESS:
5067                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5068                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5069                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5070                                 goto invalid_size;
5071                         }
5072                         at += padded_size;
5073                         break;
5074                         /* Param's with a fixed size */
5075                 case SCTP_IPV4_ADDRESS:
5076                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5077                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5078                                 goto invalid_size;
5079                         }
5080                         at += padded_size;
5081                         break;
5082                 case SCTP_IPV6_ADDRESS:
5083                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5084                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5085                                 goto invalid_size;
5086                         }
5087                         at += padded_size;
5088                         break;
5089                 case SCTP_COOKIE_PRESERVE:
5090                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5091                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5092                                 goto invalid_size;
5093                         }
5094                         at += padded_size;
5095                         break;
5096                 case SCTP_HAS_NAT_SUPPORT:
5097                         *nat_friendly = 1;
5098                         /* fall through */
5099                 case SCTP_PRSCTP_SUPPORTED:
5100                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5101                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5102                                 goto invalid_size;
5103                         }
5104                         at += padded_size;
5105                         break;
5106                 case SCTP_ECN_CAPABLE:
5107                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5108                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5109                                 goto invalid_size;
5110                         }
5111                         at += padded_size;
5112                         break;
5113                 case SCTP_ULP_ADAPTATION:
5114                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5115                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5116                                 goto invalid_size;
5117                         }
5118                         at += padded_size;
5119                         break;
5120                 case SCTP_SUCCESS_REPORT:
5121                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5122                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5123                                 goto invalid_size;
5124                         }
5125                         at += padded_size;
5126                         break;
5127                 case SCTP_HOSTNAME_ADDRESS:
5128                         {
5129                                 /* Hostname parameters are deprecated. */
5130                                 struct sctp_gen_error_cause *cause;
5131                                 int l_len;
5132
5133                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5134                                 *abort_processing = 1;
5135                                 sctp_m_freem(op_err);
5136                                 op_err = NULL;
5137                                 op_err_last = NULL;
5138 #ifdef INET6
5139                                 l_len = SCTP_MIN_OVERHEAD;
5140 #else
5141                                 l_len = SCTP_MIN_V4_OVERHEAD;
5142 #endif
5143                                 l_len += sizeof(struct sctp_chunkhdr);
5144                                 l_len += sizeof(struct sctp_gen_error_cause);
5145                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5146                                 if (op_err != NULL) {
5147                                         /*
5148                                          * Pre-reserve space for IP, SCTP,
5149                                          * and chunk header.
5150                                          */
5151 #ifdef INET6
5152                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5153 #else
5154                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5155 #endif
5156                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5157                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5158                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5159                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5160                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5161                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5162                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5163                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5164                                                 sctp_m_freem(op_err);
5165                                                 op_err = NULL;
5166                                                 op_err_last = NULL;
5167                                         }
5168                                 }
5169                                 return (op_err);
5170                                 break;
5171                         }
5172                 default:
5173                         /*
5174                          * we do not recognize the parameter figure out what
5175                          * we do.
5176                          */
5177                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5178                         if ((ptype & 0x4000) == 0x4000) {
5179                                 /* Report bit is set?? */
5180                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5181                                 if (op_err == NULL) {
5182                                         int l_len;
5183
5184                                         /* Ok need to try to get an mbuf */
5185 #ifdef INET6
5186                                         l_len = SCTP_MIN_OVERHEAD;
5187 #else
5188                                         l_len = SCTP_MIN_V4_OVERHEAD;
5189 #endif
5190                                         l_len += sizeof(struct sctp_chunkhdr);
5191                                         l_len += sizeof(struct sctp_paramhdr);
5192                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5193                                         if (op_err) {
5194                                                 SCTP_BUF_LEN(op_err) = 0;
5195 #ifdef INET6
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5197 #else
5198                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5199 #endif
5200                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5201                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5202                                                 op_err_last = op_err;
5203                                         }
5204                                 }
5205                                 if (op_err != NULL) {
5206                                         /* If we have space */
5207                                         struct sctp_paramhdr *param;
5208
5209                                         if (pad_needed > 0) {
5210                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5211                                         }
5212                                         if (op_err_last == NULL) {
5213                                                 sctp_m_freem(op_err);
5214                                                 op_err = NULL;
5215                                                 op_err_last = NULL;
5216                                                 goto more_processing;
5217                                         }
5218                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5219                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5220                                                 if (m_tmp == NULL) {
5221                                                         sctp_m_freem(op_err);
5222                                                         op_err = NULL;
5223                                                         op_err_last = NULL;
5224                                                         goto more_processing;
5225                                                 }
5226                                                 SCTP_BUF_LEN(m_tmp) = 0;
5227                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5228                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5229                                                 op_err_last = m_tmp;
5230                                         }
5231                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5232                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5233                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5234                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5235                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5236                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5237                                                 sctp_m_freem(op_err);
5238                                                 op_err = NULL;
5239                                                 op_err_last = NULL;
5240                                                 goto more_processing;
5241                                         } else {
5242                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5243                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5244                                                 }
5245                                         }
5246                                         if (plen % 4 != 0) {
5247                                                 pad_needed = 4 - (plen % 4);
5248                                         } else {
5249                                                 pad_needed = 0;
5250                                         }
5251                                 }
5252                         }
5253         more_processing:
5254                         if ((ptype & 0x8000) == 0x0000) {
5255                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5256                                 return (op_err);
5257                         } else {
5258                                 /* skip this chunk and continue processing */
5259                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5260                                 at += SCTP_SIZE32(plen);
5261                         }
5262                         break;
5263
5264                 }
5265                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5266         }
5267         return (op_err);
5268 invalid_size:
5269         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5270         *abort_processing = 1;
5271         sctp_m_freem(op_err);
5272         op_err = NULL;
5273         op_err_last = NULL;
5274         if (phdr != NULL) {
5275                 struct sctp_paramhdr *param;
5276                 int l_len;
5277 #ifdef INET6
5278                 l_len = SCTP_MIN_OVERHEAD;
5279 #else
5280                 l_len = SCTP_MIN_V4_OVERHEAD;
5281 #endif
5282                 l_len += sizeof(struct sctp_chunkhdr);
5283                 l_len += (2 * sizeof(struct sctp_paramhdr));
5284                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5285                 if (op_err) {
5286                         SCTP_BUF_LEN(op_err) = 0;
5287 #ifdef INET6
5288                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5289 #else
5290                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5291 #endif
5292                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5293                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5294                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5295                         param = mtod(op_err, struct sctp_paramhdr *);
5296                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5297                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5298                         param++;
5299                         param->param_type = htons(ptype);
5300                         param->param_length = htons(plen);
5301                 }
5302         }
5303         return (op_err);
5304 }
5305
5306 static int
5307 sctp_are_there_new_addresses(struct sctp_association *asoc,
5308     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5309 {
5310         /*
5311          * Given a INIT packet, look through the packet to verify that there
5312          * are NO new addresses. As we go through the parameters add reports
5313          * of any un-understood parameters that require an error.  Also we
5314          * must return (1) to drop the packet if we see a un-understood
5315          * parameter that tells us to drop the chunk.
5316          */
5317         struct sockaddr *sa_touse;
5318         struct sockaddr *sa;
5319         struct sctp_paramhdr *phdr, params;
5320         uint16_t ptype, plen;
5321         uint8_t fnd;
5322         struct sctp_nets *net;
5323         int check_src;
5324 #ifdef INET
5325         struct sockaddr_in sin4, *sa4;
5326 #endif
5327 #ifdef INET6
5328         struct sockaddr_in6 sin6, *sa6;
5329 #endif
5330
5331 #ifdef INET
5332         memset(&sin4, 0, sizeof(sin4));
5333         sin4.sin_family = AF_INET;
5334         sin4.sin_len = sizeof(sin4);
5335 #endif
5336 #ifdef INET6
5337         memset(&sin6, 0, sizeof(sin6));
5338         sin6.sin6_family = AF_INET6;
5339         sin6.sin6_len = sizeof(sin6);
5340 #endif
5341         /* First what about the src address of the pkt ? */
5342         check_src = 0;
5343         switch (src->sa_family) {
5344 #ifdef INET
5345         case AF_INET:
5346                 if (asoc->scope.ipv4_addr_legal) {
5347                         check_src = 1;
5348                 }
5349                 break;
5350 #endif
5351 #ifdef INET6
5352         case AF_INET6:
5353                 if (asoc->scope.ipv6_addr_legal) {
5354                         check_src = 1;
5355                 }
5356                 break;
5357 #endif
5358         default:
5359                 /* TSNH */
5360                 break;
5361         }
5362         if (check_src) {
5363                 fnd = 0;
5364                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5365                         sa = (struct sockaddr *)&net->ro._l_addr;
5366                         if (sa->sa_family == src->sa_family) {
5367 #ifdef INET
5368                                 if (sa->sa_family == AF_INET) {
5369                                         struct sockaddr_in *src4;
5370
5371                                         sa4 = (struct sockaddr_in *)sa;
5372                                         src4 = (struct sockaddr_in *)src;
5373                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5374                                                 fnd = 1;
5375                                                 break;
5376                                         }
5377                                 }
5378 #endif
5379 #ifdef INET6
5380                                 if (sa->sa_family == AF_INET6) {
5381                                         struct sockaddr_in6 *src6;
5382
5383                                         sa6 = (struct sockaddr_in6 *)sa;
5384                                         src6 = (struct sockaddr_in6 *)src;
5385                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5386                                                 fnd = 1;
5387                                                 break;
5388                                         }
5389                                 }
5390 #endif
5391                         }
5392                 }
5393                 if (fnd == 0) {
5394                         /* New address added! no need to look further. */
5395                         return (1);
5396                 }
5397         }
5398         /* Ok so far lets munge through the rest of the packet */
5399         offset += sizeof(struct sctp_init_chunk);
5400         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5401         while (phdr) {
5402                 sa_touse = NULL;
5403                 ptype = ntohs(phdr->param_type);
5404                 plen = ntohs(phdr->param_length);
5405                 switch (ptype) {
5406 #ifdef INET
5407                 case SCTP_IPV4_ADDRESS:
5408                         {
5409                                 struct sctp_ipv4addr_param *p4, p4_buf;
5410
5411                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5412                                         return (1);
5413                                 }
5414                                 phdr = sctp_get_next_param(in_initpkt, offset,
5415                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5416                                 if (phdr == NULL) {
5417                                         return (1);
5418                                 }
5419                                 if (asoc->scope.ipv4_addr_legal) {
5420                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5421                                         sin4.sin_addr.s_addr = p4->addr;
5422                                         sa_touse = (struct sockaddr *)&sin4;
5423                                 }
5424                                 break;
5425                         }
5426 #endif
5427 #ifdef INET6
5428                 case SCTP_IPV6_ADDRESS:
5429                         {
5430                                 struct sctp_ipv6addr_param *p6, p6_buf;
5431
5432                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5433                                         return (1);
5434                                 }
5435                                 phdr = sctp_get_next_param(in_initpkt, offset,
5436                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5437                                 if (phdr == NULL) {
5438                                         return (1);
5439                                 }
5440                                 if (asoc->scope.ipv6_addr_legal) {
5441                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5442                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5443                                             sizeof(p6->addr));
5444                                         sa_touse = (struct sockaddr *)&sin6;
5445                                 }
5446                                 break;
5447                         }
5448 #endif
5449                 default:
5450                         sa_touse = NULL;
5451                         break;
5452                 }
5453                 if (sa_touse) {
5454                         /* ok, sa_touse points to one to check */
5455                         fnd = 0;
5456                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5457                                 sa = (struct sockaddr *)&net->ro._l_addr;
5458                                 if (sa->sa_family != sa_touse->sa_family) {
5459                                         continue;
5460                                 }
5461 #ifdef INET
5462                                 if (sa->sa_family == AF_INET) {
5463                                         sa4 = (struct sockaddr_in *)sa;
5464                                         if (sa4->sin_addr.s_addr ==
5465                                             sin4.sin_addr.s_addr) {
5466                                                 fnd = 1;
5467                                                 break;
5468                                         }
5469                                 }
5470 #endif
5471 #ifdef INET6
5472                                 if (sa->sa_family == AF_INET6) {
5473                                         sa6 = (struct sockaddr_in6 *)sa;
5474                                         if (SCTP6_ARE_ADDR_EQUAL(
5475                                             sa6, &sin6)) {
5476                                                 fnd = 1;
5477                                                 break;
5478                                         }
5479                                 }
5480 #endif
5481                         }
5482                         if (!fnd) {
5483                                 /* New addr added! no need to look further */
5484                                 return (1);
5485                         }
5486                 }
5487                 offset += SCTP_SIZE32(plen);
5488                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5489         }
5490         return (0);
5491 }
5492
5493 /*
5494  * Given a MBUF chain that was sent into us containing an INIT. Build a
5495  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5496  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5497  * message (i.e. the struct sctp_init_msg).
5498  */
5499 void
5500 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5501     struct sctp_nets *src_net, struct mbuf *init_pkt,
5502     int iphlen, int offset,
5503     struct sockaddr *src, struct sockaddr *dst,
5504     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5505     uint8_t mflowtype, uint32_t mflowid,
5506     uint32_t vrf_id, uint16_t port)
5507 {
5508         struct sctp_association *asoc;
5509         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5510         struct sctp_init_ack_chunk *initack;
5511         struct sctp_adaptation_layer_indication *ali;
5512         struct sctp_supported_chunk_types_param *pr_supported;
5513         struct sctp_paramhdr *ph;
5514         union sctp_sockstore *over_addr;
5515         struct sctp_scoping scp;
5516         struct timeval now;
5517 #ifdef INET
5518         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5519         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5520         struct sockaddr_in *sin;
5521 #endif
5522 #ifdef INET6
5523         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5524         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5525         struct sockaddr_in6 *sin6;
5526 #endif
5527         struct sockaddr *to;
5528         struct sctp_state_cookie stc;
5529         struct sctp_nets *net = NULL;
5530         uint8_t *signature = NULL;
5531         int cnt_inits_to = 0;
5532         uint16_t his_limit, i_want;
5533         int abort_flag;
5534         int nat_friendly = 0;
5535         int error;
5536         struct socket *so;
5537         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5538
5539         if (stcb) {
5540                 asoc = &stcb->asoc;
5541         } else {
5542                 asoc = NULL;
5543         }
5544         if ((asoc != NULL) &&
5545             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5546                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5547                         /*
5548                          * new addresses, out of here in non-cookie-wait
5549                          * states
5550                          *
5551                          * Send an ABORT, without the new address error
5552                          * cause. This looks no different than if no
5553                          * listener was present.
5554                          */
5555                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556                             "Address added");
5557                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5558                             mflowtype, mflowid, inp->fibnum,
5559                             vrf_id, port);
5560                         return;
5561                 }
5562                 if (src_net != NULL && (src_net->port != port)) {
5563                         /*
5564                          * change of remote encapsulation port, out of here
5565                          * in non-cookie-wait states
5566                          *
5567                          * Send an ABORT, without an specific error cause.
5568                          * This looks no different than if no listener was
5569                          * present.
5570                          */
5571                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5572                             "Remote encapsulation port changed");
5573                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5574                             mflowtype, mflowid, inp->fibnum,
5575                             vrf_id, port);
5576                         return;
5577                 }
5578         }
5579         abort_flag = 0;
5580         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5581             (offset + sizeof(struct sctp_init_chunk)),
5582             &abort_flag,
5583             (struct sctp_chunkhdr *)init_chk,
5584             &nat_friendly, NULL);
5585         if (abort_flag) {
5586 do_a_abort:
5587                 if (op_err == NULL) {
5588                         char msg[SCTP_DIAG_INFO_LEN];
5589
5590                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5591                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5592                             msg);
5593                 }
5594                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5595                     init_chk->init.initiate_tag, op_err,
5596                     mflowtype, mflowid, inp->fibnum,
5597                     vrf_id, port);
5598                 return;
5599         }
5600         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5601         if (m == NULL) {
5602                 /* No memory, INIT timer will re-attempt. */
5603                 sctp_m_freem(op_err);
5604                 return;
5605         }
5606         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5607         padding_len = 0;
5608
5609         /*
5610          * We might not overwrite the identification[] completely and on
5611          * some platforms time_entered will contain some padding. Therefore
5612          * zero out the cookie to avoid putting uninitialized memory on the
5613          * wire.
5614          */
5615         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5616
5617         /* the time I built cookie */
5618         (void)SCTP_GETTIME_TIMEVAL(&now);
5619         stc.time_entered.tv_sec = now.tv_sec;
5620         stc.time_entered.tv_usec = now.tv_usec;
5621
5622         /* populate any tie tags */
5623         if (asoc != NULL) {
5624                 /* unlock before tag selections */
5625                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5626                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5627                 stc.cookie_life = asoc->cookie_life;
5628                 net = asoc->primary_destination;
5629         } else {
5630                 stc.tie_tag_my_vtag = 0;
5631                 stc.tie_tag_peer_vtag = 0;
5632                 /* life I will award this cookie */
5633                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5634         }
5635
5636         /* copy in the ports for later check */
5637         stc.myport = sh->dest_port;
5638         stc.peerport = sh->src_port;
5639
5640         /*
5641          * If we wanted to honor cookie life extensions, we would add to
5642          * stc.cookie_life. For now we should NOT honor any extension
5643          */
5644         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5645         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5646                 stc.ipv6_addr_legal = 1;
5647                 if (SCTP_IPV6_V6ONLY(inp)) {
5648                         stc.ipv4_addr_legal = 0;
5649                 } else {
5650                         stc.ipv4_addr_legal = 1;
5651                 }
5652         } else {
5653                 stc.ipv6_addr_legal = 0;
5654                 stc.ipv4_addr_legal = 1;
5655         }
5656         stc.ipv4_scope = 0;
5657         if (net == NULL) {
5658                 to = src;
5659                 switch (dst->sa_family) {
5660 #ifdef INET
5661                 case AF_INET:
5662                         {
5663                                 /* lookup address */
5664                                 stc.address[0] = src4->sin_addr.s_addr;
5665                                 stc.address[1] = 0;
5666                                 stc.address[2] = 0;
5667                                 stc.address[3] = 0;
5668                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5669                                 /* local from address */
5670                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5671                                 stc.laddress[1] = 0;
5672                                 stc.laddress[2] = 0;
5673                                 stc.laddress[3] = 0;
5674                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5675                                 /* scope_id is only for v6 */
5676                                 stc.scope_id = 0;
5677                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5678                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5679                                         stc.ipv4_scope = 1;
5680                                 }
5681                                 /* Must use the address in this case */
5682                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5683                                         stc.loopback_scope = 1;
5684                                         stc.ipv4_scope = 1;
5685                                         stc.site_scope = 1;
5686                                         stc.local_scope = 0;
5687                                 }
5688                                 break;
5689                         }
5690 #endif
5691 #ifdef INET6
5692                 case AF_INET6:
5693                         {
5694                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5695                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5696                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5697                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5698                                         stc.loopback_scope = 1;
5699                                         stc.local_scope = 0;
5700                                         stc.site_scope = 1;
5701                                         stc.ipv4_scope = 1;
5702                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5703                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5704                                         /*
5705                                          * If the new destination or source
5706                                          * is a LINK_LOCAL we must have
5707                                          * common both site and local scope.
5708                                          * Don't set local scope though
5709                                          * since we must depend on the
5710                                          * source to be added implicitly. We
5711                                          * cannot assure just because we
5712                                          * share one link that all links are
5713                                          * common.
5714                                          */
5715                                         stc.local_scope = 0;
5716                                         stc.site_scope = 1;
5717                                         stc.ipv4_scope = 1;
5718                                         /*
5719                                          * we start counting for the private
5720                                          * address stuff at 1. since the
5721                                          * link local we source from won't
5722                                          * show up in our scoped count.
5723                                          */
5724                                         cnt_inits_to = 1;
5725                                         /*
5726                                          * pull out the scope_id from
5727                                          * incoming pkt
5728                                          */
5729                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5730                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5731                                         /*
5732                                          * If the new destination or source
5733                                          * is SITE_LOCAL then we must have
5734                                          * site scope in common.
5735                                          */
5736                                         stc.site_scope = 1;
5737                                 }
5738                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5739                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5740                                 break;
5741                         }
5742 #endif
5743                 default:
5744                         /* TSNH */
5745                         goto do_a_abort;
5746                         break;
5747                 }
5748         } else {
5749                 /* set the scope per the existing tcb */
5750
5751 #ifdef INET6
5752                 struct sctp_nets *lnet;
5753 #endif
5754
5755                 stc.loopback_scope = asoc->scope.loopback_scope;
5756                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5757                 stc.site_scope = asoc->scope.site_scope;
5758                 stc.local_scope = asoc->scope.local_scope;
5759 #ifdef INET6
5760                 /* Why do we not consider IPv4 LL addresses? */
5761                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5762                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5763                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5764                                         /*
5765                                          * if we have a LL address, start
5766                                          * counting at 1.
5767                                          */
5768                                         cnt_inits_to = 1;
5769                                 }
5770                         }
5771                 }
5772 #endif
5773                 /* use the net pointer */
5774                 to = (struct sockaddr *)&net->ro._l_addr;
5775                 switch (to->sa_family) {
5776 #ifdef INET
5777                 case AF_INET:
5778                         sin = (struct sockaddr_in *)to;
5779                         stc.address[0] = sin->sin_addr.s_addr;
5780                         stc.address[1] = 0;
5781                         stc.address[2] = 0;
5782                         stc.address[3] = 0;
5783                         stc.addr_type = SCTP_IPV4_ADDRESS;
5784                         if (net->src_addr_selected == 0) {
5785                                 /*
5786                                  * strange case here, the INIT should have
5787                                  * did the selection.
5788                                  */
5789                                 net->ro._s_addr = sctp_source_address_selection(inp,
5790                                     stcb, (sctp_route_t *)&net->ro,
5791                                     net, 0, vrf_id);
5792                                 if (net->ro._s_addr == NULL) {
5793                                         sctp_m_freem(op_err);
5794                                         sctp_m_freem(m);
5795                                         return;
5796                                 }
5797
5798                                 net->src_addr_selected = 1;
5799
5800                         }
5801                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5802                         stc.laddress[1] = 0;
5803                         stc.laddress[2] = 0;
5804                         stc.laddress[3] = 0;
5805                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5806                         /* scope_id is only for v6 */
5807                         stc.scope_id = 0;
5808                         break;
5809 #endif
5810 #ifdef INET6
5811                 case AF_INET6:
5812                         sin6 = (struct sockaddr_in6 *)to;
5813                         memcpy(&stc.address, &sin6->sin6_addr,
5814                             sizeof(struct in6_addr));
5815                         stc.addr_type = SCTP_IPV6_ADDRESS;
5816                         stc.scope_id = sin6->sin6_scope_id;
5817                         if (net->src_addr_selected == 0) {
5818                                 /*
5819                                  * strange case here, the INIT should have
5820                                  * done the selection.
5821                                  */
5822                                 net->ro._s_addr = sctp_source_address_selection(inp,
5823                                     stcb, (sctp_route_t *)&net->ro,
5824                                     net, 0, vrf_id);
5825                                 if (net->ro._s_addr == NULL) {
5826                                         sctp_m_freem(op_err);
5827                                         sctp_m_freem(m);
5828                                         return;
5829                                 }
5830
5831                                 net->src_addr_selected = 1;
5832                         }
5833                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5834                             sizeof(struct in6_addr));
5835                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5836                         break;
5837 #endif
5838                 }
5839         }
5840         /* Now lets put the SCTP header in place */
5841         initack = mtod(m, struct sctp_init_ack_chunk *);
5842         /* Save it off for quick ref */
5843         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5844         /* who are we */
5845         memcpy(stc.identification, SCTP_VERSION_STRING,
5846             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5847         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5848         /* now the chunk header */
5849         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5850         initack->ch.chunk_flags = 0;
5851         /* fill in later from mbuf we build */
5852         initack->ch.chunk_length = 0;
5853         /* place in my tag */
5854         if ((asoc != NULL) &&
5855             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5856             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5857             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5858                 /* re-use the v-tags and init-seq here */
5859                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5860                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5861         } else {
5862                 uint32_t vtag, itsn;
5863
5864                 if (asoc) {
5865                         atomic_add_int(&asoc->refcnt, 1);
5866                         SCTP_TCB_UNLOCK(stcb);
5867         new_tag:
5868                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5869                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5870                                 /*
5871                                  * Got a duplicate vtag on some guy behind a
5872                                  * nat make sure we don't use it.
5873                                  */
5874                                 goto new_tag;
5875                         }
5876                         initack->init.initiate_tag = htonl(vtag);
5877                         /* get a TSN to use too */
5878                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5879                         initack->init.initial_tsn = htonl(itsn);
5880                         SCTP_TCB_LOCK(stcb);
5881                         atomic_add_int(&asoc->refcnt, -1);
5882                 } else {
5883                         SCTP_INP_INCR_REF(inp);
5884                         SCTP_INP_RUNLOCK(inp);
5885                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5886                         initack->init.initiate_tag = htonl(vtag);
5887                         /* get a TSN to use too */
5888                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5889                         SCTP_INP_RLOCK(inp);
5890                         SCTP_INP_DECR_REF(inp);
5891                 }
5892         }
5893         /* save away my tag to */
5894         stc.my_vtag = initack->init.initiate_tag;
5895
5896         /* set up some of the credits. */
5897         so = inp->sctp_socket;
5898         if (so == NULL) {
5899                 /* memory problem */
5900                 sctp_m_freem(op_err);
5901                 sctp_m_freem(m);
5902                 return;
5903         } else {
5904                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5905         }
5906         /* set what I want */
5907         his_limit = ntohs(init_chk->init.num_inbound_streams);
5908         /* choose what I want */
5909         if (asoc != NULL) {
5910                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5911                         i_want = asoc->streamoutcnt;
5912                 } else {
5913                         i_want = asoc->pre_open_streams;
5914                 }
5915         } else {
5916                 i_want = inp->sctp_ep.pre_open_stream_count;
5917         }
5918         if (his_limit < i_want) {
5919                 /* I Want more :< */
5920                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5921         } else {
5922                 /* I can have what I want :> */
5923                 initack->init.num_outbound_streams = htons(i_want);
5924         }
5925         /* tell him his limit. */
5926         initack->init.num_inbound_streams =
5927             htons(inp->sctp_ep.max_open_streams_intome);
5928
5929         /* adaptation layer indication parameter */
5930         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5931                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5932                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5933                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5934                 ali->ph.param_length = htons(parameter_len);
5935                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5936                 chunk_len += parameter_len;
5937         }
5938
5939         /* ECN parameter */
5940         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5941             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5942                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5943                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5944                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5945                 ph->param_length = htons(parameter_len);
5946                 chunk_len += parameter_len;
5947         }
5948
5949         /* PR-SCTP supported parameter */
5950         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5951             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5952                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5953                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5954                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5955                 ph->param_length = htons(parameter_len);
5956                 chunk_len += parameter_len;
5957         }
5958
5959         /* Add NAT friendly parameter */
5960         if (nat_friendly) {
5961                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5962                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5963                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5964                 ph->param_length = htons(parameter_len);
5965                 chunk_len += parameter_len;
5966         }
5967
5968         /* And now tell the peer which extensions we support */
5969         num_ext = 0;
5970         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5971         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5972             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5973                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5974                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5975                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5976                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5977                 }
5978         }
5979         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5980             ((asoc == NULL) && (inp->auth_supported == 1))) {
5981                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5982         }
5983         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5984             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5985                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5986                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5987         }
5988         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5989             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5990                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5991         }
5992         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5993             ((asoc == NULL) && (inp->idata_supported == 1))) {
5994                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5995         }
5996         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5997             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5998                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5999         }
6000         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
6001             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
6002                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
6003         }
6004         if (num_ext > 0) {
6005                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
6006                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
6007                 pr_supported->ph.param_length = htons(parameter_len);
6008                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6009                 chunk_len += parameter_len;
6010         }
6011
6012         /* add authentication parameters */
6013         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6014             ((asoc == NULL) && (inp->auth_supported == 1))) {
6015                 struct sctp_auth_random *randp;
6016                 struct sctp_auth_hmac_algo *hmacs;
6017                 struct sctp_auth_chunk_list *chunks;
6018
6019                 if (padding_len > 0) {
6020                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6021                         chunk_len += padding_len;
6022                         padding_len = 0;
6023                 }
6024                 /* generate and add RANDOM parameter */
6025                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6026                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6027                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6028                 randp->ph.param_type = htons(SCTP_RANDOM);
6029                 randp->ph.param_length = htons(parameter_len);
6030                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6031                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6032                 chunk_len += parameter_len;
6033
6034                 if (padding_len > 0) {
6035                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6036                         chunk_len += padding_len;
6037                         padding_len = 0;
6038                 }
6039                 /* add HMAC_ALGO parameter */
6040                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6041                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6042                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6043                     (uint8_t *)hmacs->hmac_ids);
6044                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6045                 hmacs->ph.param_length = htons(parameter_len);
6046                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6047                 chunk_len += parameter_len;
6048
6049                 if (padding_len > 0) {
6050                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6051                         chunk_len += padding_len;
6052                         padding_len = 0;
6053                 }
6054                 /* add CHUNKS parameter */
6055                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6056                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6057                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6058                     chunks->chunk_types);
6059                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6060                 chunks->ph.param_length = htons(parameter_len);
6061                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6062                 chunk_len += parameter_len;
6063         }
6064         SCTP_BUF_LEN(m) = chunk_len;
6065         m_last = m;
6066         /* now the addresses */
6067         /*
6068          * To optimize this we could put the scoping stuff into a structure
6069          * and remove the individual uint8's from the stc structure. Then we
6070          * could just sifa in the address within the stc.. but for now this
6071          * is a quick hack to get the address stuff teased apart.
6072          */
6073         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6074         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6075         scp.loopback_scope = stc.loopback_scope;
6076         scp.ipv4_local_scope = stc.ipv4_scope;
6077         scp.local_scope = stc.local_scope;
6078         scp.site_scope = stc.site_scope;
6079         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6080             cnt_inits_to,
6081             &padding_len, &chunk_len);
6082         /* padding_len can only be positive, if no addresses have been added */
6083         if (padding_len > 0) {
6084                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6085                 chunk_len += padding_len;
6086                 SCTP_BUF_LEN(m) += padding_len;
6087                 padding_len = 0;
6088         }
6089
6090         /* tack on the operational error if present */
6091         if (op_err) {
6092                 parameter_len = 0;
6093                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6094                         parameter_len += SCTP_BUF_LEN(m_tmp);
6095                 }
6096                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6097                 SCTP_BUF_NEXT(m_last) = op_err;
6098                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6099                         m_last = SCTP_BUF_NEXT(m_last);
6100                 }
6101                 chunk_len += parameter_len;
6102         }
6103         if (padding_len > 0) {
6104                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6105                 if (m_last == NULL) {
6106                         /* Houston we have a problem, no space */
6107                         sctp_m_freem(m);
6108                         return;
6109                 }
6110                 chunk_len += padding_len;
6111                 padding_len = 0;
6112         }
6113         /* Now we must build a cookie */
6114         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6115         if (m_cookie == NULL) {
6116                 /* memory problem */
6117                 sctp_m_freem(m);
6118                 return;
6119         }
6120         /* Now append the cookie to the end and update the space/size */
6121         SCTP_BUF_NEXT(m_last) = m_cookie;
6122         parameter_len = 0;
6123         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6124                 parameter_len += SCTP_BUF_LEN(m_tmp);
6125                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6126                         m_last = m_tmp;
6127                 }
6128         }
6129         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6130         chunk_len += parameter_len;
6131
6132         /*
6133          * Place in the size, but we don't include the last pad (if any) in
6134          * the INIT-ACK.
6135          */
6136         initack->ch.chunk_length = htons(chunk_len);
6137
6138         /*
6139          * Time to sign the cookie, we don't sign over the cookie signature
6140          * though thus we set trailer.
6141          */
6142         (void)sctp_hmac_m(SCTP_HMAC,
6143             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6144             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6145             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6146         /*
6147          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6148          * here since the timer will drive a retranmission.
6149          */
6150         if (padding_len > 0) {
6151                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6152                         sctp_m_freem(m);
6153                         return;
6154                 }
6155         }
6156         if (stc.loopback_scope) {
6157                 over_addr = (union sctp_sockstore *)dst;
6158         } else {
6159                 over_addr = NULL;
6160         }
6161
6162         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6163             0, 0,
6164             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6165             port, over_addr,
6166             mflowtype, mflowid,
6167             SCTP_SO_NOT_LOCKED))) {
6168                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6169                 if (error == ENOBUFS) {
6170                         if (asoc != NULL) {
6171                                 asoc->ifp_had_enobuf = 1;
6172                         }
6173                         SCTP_STAT_INCR(sctps_lowlevelerr);
6174                 }
6175         } else {
6176                 if (asoc != NULL) {
6177                         asoc->ifp_had_enobuf = 0;
6178                 }
6179         }
6180         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6181 }
6182
6183
6184 static void
6185 sctp_prune_prsctp(struct sctp_tcb *stcb,
6186     struct sctp_association *asoc,
6187     struct sctp_sndrcvinfo *srcv,
6188     int dataout)
6189 {
6190         int freed_spc = 0;
6191         struct sctp_tmit_chunk *chk, *nchk;
6192
6193         SCTP_TCB_LOCK_ASSERT(stcb);
6194         if ((asoc->prsctp_supported) &&
6195             (asoc->sent_queue_cnt_removeable > 0)) {
6196                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6197                         /*
6198                          * Look for chunks marked with the PR_SCTP flag AND
6199                          * the buffer space flag. If the one being sent is
6200                          * equal or greater priority then purge the old one
6201                          * and free some space.
6202                          */
6203                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6204                                 /*
6205                                  * This one is PR-SCTP AND buffer space
6206                                  * limited type
6207                                  */
6208                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6209                                         /*
6210                                          * Lower numbers equates to higher
6211                                          * priority so if the one we are
6212                                          * looking at has a larger or equal
6213                                          * priority we want to drop the data
6214                                          * and NOT retransmit it.
6215                                          */
6216                                         if (chk->data) {
6217                                                 /*
6218                                                  * We release the book_size
6219                                                  * if the mbuf is here
6220                                                  */
6221                                                 int ret_spc;
6222                                                 uint8_t sent;
6223
6224                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6225                                                         sent = 1;
6226                                                 else
6227                                                         sent = 0;
6228                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6229                                                     sent,
6230                                                     SCTP_SO_LOCKED);
6231                                                 freed_spc += ret_spc;
6232                                                 if (freed_spc >= dataout) {
6233                                                         return;
6234                                                 }
6235                                         }       /* if chunk was present */
6236                                 }       /* if of sufficient priority */
6237                         }       /* if chunk has enabled */
6238                 }               /* tailqforeach */
6239
6240                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6241                         /* Here we must move to the sent queue and mark */
6242                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6243                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6244                                         if (chk->data) {
6245                                                 /*
6246                                                  * We release the book_size
6247                                                  * if the mbuf is here
6248                                                  */
6249                                                 int ret_spc;
6250
6251                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6252                                                     0, SCTP_SO_LOCKED);
6253
6254                                                 freed_spc += ret_spc;
6255                                                 if (freed_spc >= dataout) {
6256                                                         return;
6257                                                 }
6258                                         }       /* end if chk->data */
6259                                 }       /* end if right class */
6260                         }       /* end if chk pr-sctp */
6261                 }               /* tailqforeachsafe (chk) */
6262         }                       /* if enabled in asoc */
6263 }
6264
6265 int
6266 sctp_get_frag_point(struct sctp_tcb *stcb,
6267     struct sctp_association *asoc)
6268 {
6269         int siz, ovh;
6270
6271         /*
6272          * For endpoints that have both v6 and v4 addresses we must reserve
6273          * room for the ipv6 header, for those that are only dealing with V4
6274          * we use a larger frag point.
6275          */
6276         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6277                 ovh = SCTP_MIN_OVERHEAD;
6278         } else {
6279                 ovh = SCTP_MIN_V4_OVERHEAD;
6280         }
6281         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6282         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6283                 siz = asoc->smallest_mtu - ovh;
6284         else
6285                 siz = (stcb->asoc.sctp_frag_point - ovh);
6286         /*
6287          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6288          */
6289         /* A data chunk MUST fit in a cluster */
6290         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6291         /* } */
6292
6293         /* adjust for an AUTH chunk if DATA requires auth */
6294         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6295                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6296
6297         if (siz % 4) {
6298                 /* make it an even word boundary please */
6299                 siz -= (siz % 4);
6300         }
6301         return (siz);
6302 }
6303
6304 static void
6305 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6306 {
6307         /*
6308          * We assume that the user wants PR_SCTP_TTL if the user provides a
6309          * positive lifetime but does not specify any PR_SCTP policy.
6310          */
6311         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6312                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6313         } else if (sp->timetolive > 0) {
6314                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6315                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6316         } else {
6317                 return;
6318         }
6319         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6320         case CHUNK_FLAGS_PR_SCTP_BUF:
6321                 /*
6322                  * Time to live is a priority stored in tv_sec when doing
6323                  * the buffer drop thing.
6324                  */
6325                 sp->ts.tv_sec = sp->timetolive;
6326                 sp->ts.tv_usec = 0;
6327                 break;
6328         case CHUNK_FLAGS_PR_SCTP_TTL:
6329                 {
6330                         struct timeval tv;
6331
6332                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6333                         tv.tv_sec = sp->timetolive / 1000;
6334                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6335                         /*
6336                          * TODO sctp_constants.h needs alternative time
6337                          * macros when _KERNEL is undefined.
6338                          */
6339                         timevaladd(&sp->ts, &tv);
6340                 }
6341                 break;
6342         case CHUNK_FLAGS_PR_SCTP_RTX:
6343                 /*
6344                  * Time to live is a the number or retransmissions stored in
6345                  * tv_sec.
6346                  */
6347                 sp->ts.tv_sec = sp->timetolive;
6348                 sp->ts.tv_usec = 0;
6349                 break;
6350         default:
6351                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6352                     "Unknown PR_SCTP policy %u.\n",
6353                     PR_SCTP_POLICY(sp->sinfo_flags));
6354                 break;
6355         }
6356 }
6357
6358 static int
6359 sctp_msg_append(struct sctp_tcb *stcb,
6360     struct sctp_nets *net,
6361     struct mbuf *m,
6362     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6363 {
6364         int error = 0;
6365         struct mbuf *at;
6366         struct sctp_stream_queue_pending *sp = NULL;
6367         struct sctp_stream_out *strm;
6368
6369         /*
6370          * Given an mbuf chain, put it into the association send queue and
6371          * place it on the wheel
6372          */
6373         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6374                 /* Invalid stream number */
6375                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6376                 error = EINVAL;
6377                 goto out_now;
6378         }
6379         if ((stcb->asoc.stream_locked) &&
6380             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6381                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6382                 error = EINVAL;
6383                 goto out_now;
6384         }
6385         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6386         /* Now can we send this? */
6387         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6388             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6389             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6390             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6391                 /* got data while shutting down */
6392                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6393                 error = ECONNRESET;
6394                 goto out_now;
6395         }
6396         sctp_alloc_a_strmoq(stcb, sp);
6397         if (sp == NULL) {
6398                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6399                 error = ENOMEM;
6400                 goto out_now;
6401         }
6402         sp->sinfo_flags = srcv->sinfo_flags;
6403         sp->timetolive = srcv->sinfo_timetolive;
6404         sp->ppid = srcv->sinfo_ppid;
6405         sp->context = srcv->sinfo_context;
6406         sp->fsn = 0;
6407         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6408                 sp->net = net;
6409                 atomic_add_int(&sp->net->ref_count, 1);
6410         } else {
6411                 sp->net = NULL;
6412         }
6413         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6414         sp->sid = srcv->sinfo_stream;
6415         sp->msg_is_complete = 1;
6416         sp->sender_all_done = 1;
6417         sp->some_taken = 0;
6418         sp->data = m;
6419         sp->tail_mbuf = NULL;
6420         sctp_set_prsctp_policy(sp);
6421         /*
6422          * We could in theory (for sendall) sifa the length in, but we would
6423          * still have to hunt through the chain since we need to setup the
6424          * tail_mbuf
6425          */
6426         sp->length = 0;
6427         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6428                 if (SCTP_BUF_NEXT(at) == NULL)
6429                         sp->tail_mbuf = at;
6430                 sp->length += SCTP_BUF_LEN(at);
6431         }
6432         if (srcv->sinfo_keynumber_valid) {
6433                 sp->auth_keyid = srcv->sinfo_keynumber;
6434         } else {
6435                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6436         }
6437         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6438                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6439                 sp->holds_key_ref = 1;
6440         }
6441         if (hold_stcb_lock == 0) {
6442                 SCTP_TCB_SEND_LOCK(stcb);
6443         }
6444         sctp_snd_sb_alloc(stcb, sp->length);
6445         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6446         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6447         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6448         m = NULL;
6449         if (hold_stcb_lock == 0) {
6450                 SCTP_TCB_SEND_UNLOCK(stcb);
6451         }
6452 out_now:
6453         if (m) {
6454                 sctp_m_freem(m);
6455         }
6456         return (error);
6457 }
6458
6459
6460 static struct mbuf *
6461 sctp_copy_mbufchain(struct mbuf *clonechain,
6462     struct mbuf *outchain,
6463     struct mbuf **endofchain,
6464     int can_take_mbuf,
6465     int sizeofcpy,
6466     uint8_t copy_by_ref)
6467 {
6468         struct mbuf *m;
6469         struct mbuf *appendchain;
6470         caddr_t cp;
6471         int len;
6472
6473         if (endofchain == NULL) {
6474                 /* error */
6475 error_out:
6476                 if (outchain)
6477                         sctp_m_freem(outchain);
6478                 return (NULL);
6479         }
6480         if (can_take_mbuf) {
6481                 appendchain = clonechain;
6482         } else {
6483                 if (!copy_by_ref &&
6484                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6485                     ) {
6486                         /* Its not in a cluster */
6487                         if (*endofchain == NULL) {
6488                                 /* lets get a mbuf cluster */
6489                                 if (outchain == NULL) {
6490                                         /* This is the general case */
6491                         new_mbuf:
6492                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6493                                         if (outchain == NULL) {
6494                                                 goto error_out;
6495                                         }
6496                                         SCTP_BUF_LEN(outchain) = 0;
6497                                         *endofchain = outchain;
6498                                         /* get the prepend space */
6499                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6500                                 } else {
6501                                         /*
6502                                          * We really should not get a NULL
6503                                          * in endofchain
6504                                          */
6505                                         /* find end */
6506                                         m = outchain;
6507                                         while (m) {
6508                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6509                                                         *endofchain = m;
6510                                                         break;
6511                                                 }
6512                                                 m = SCTP_BUF_NEXT(m);
6513                                         }
6514                                         /* sanity */
6515                                         if (*endofchain == NULL) {
6516                                                 /*
6517                                                  * huh, TSNH XXX maybe we
6518                                                  * should panic
6519                                                  */
6520                                                 sctp_m_freem(outchain);
6521                                                 goto new_mbuf;
6522                                         }
6523                                 }
6524                                 /* get the new end of length */
6525                                 len = (int)M_TRAILINGSPACE(*endofchain);
6526                         } else {
6527                                 /* how much is left at the end? */
6528                                 len = (int)M_TRAILINGSPACE(*endofchain);
6529                         }
6530                         /* Find the end of the data, for appending */
6531                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6532
6533                         /* Now lets copy it out */
6534                         if (len >= sizeofcpy) {
6535                                 /* It all fits, copy it in */
6536                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6537                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6538                         } else {
6539                                 /* fill up the end of the chain */
6540                                 if (len > 0) {
6541                                         m_copydata(clonechain, 0, len, cp);
6542                                         SCTP_BUF_LEN((*endofchain)) += len;
6543                                         /* now we need another one */
6544                                         sizeofcpy -= len;
6545                                 }
6546                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6547                                 if (m == NULL) {
6548                                         /* We failed */
6549                                         goto error_out;
6550                                 }
6551                                 SCTP_BUF_NEXT((*endofchain)) = m;
6552                                 *endofchain = m;
6553                                 cp = mtod((*endofchain), caddr_t);
6554                                 m_copydata(clonechain, len, sizeofcpy, cp);
6555                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6556                         }
6557                         return (outchain);
6558                 } else {
6559                         /* copy the old fashion way */
6560                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6561 #ifdef SCTP_MBUF_LOGGING
6562                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6563                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6564                         }
6565 #endif
6566                 }
6567         }
6568         if (appendchain == NULL) {
6569                 /* error */
6570                 if (outchain)
6571                         sctp_m_freem(outchain);
6572                 return (NULL);
6573         }
6574         if (outchain) {
6575                 /* tack on to the end */
6576                 if (*endofchain != NULL) {
6577                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6578                 } else {
6579                         m = outchain;
6580                         while (m) {
6581                                 if (SCTP_BUF_NEXT(m) == NULL) {
6582                                         SCTP_BUF_NEXT(m) = appendchain;
6583                                         break;
6584                                 }
6585                                 m = SCTP_BUF_NEXT(m);
6586                         }
6587                 }
6588                 /*
6589                  * save off the end and update the end-chain position
6590                  */
6591                 m = appendchain;
6592                 while (m) {
6593                         if (SCTP_BUF_NEXT(m) == NULL) {
6594                                 *endofchain = m;
6595                                 break;
6596                         }
6597                         m = SCTP_BUF_NEXT(m);
6598                 }
6599                 return (outchain);
6600         } else {
6601                 /* save off the end and update the end-chain position */
6602                 m = appendchain;
6603                 while (m) {
6604                         if (SCTP_BUF_NEXT(m) == NULL) {
6605                                 *endofchain = m;
6606                                 break;
6607                         }
6608                         m = SCTP_BUF_NEXT(m);
6609                 }
6610                 return (appendchain);
6611         }
6612 }
6613
6614 static int
6615 sctp_med_chunk_output(struct sctp_inpcb *inp,
6616     struct sctp_tcb *stcb,
6617     struct sctp_association *asoc,
6618     int *num_out,
6619     int *reason_code,
6620     int control_only, int from_where,
6621     struct timeval *now, int *now_filled, int frag_point, int so_locked
6622 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6623     SCTP_UNUSED
6624 #endif
6625 );
6626
6627 static void
6628 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6629     uint32_t val SCTP_UNUSED)
6630 {
6631         struct sctp_copy_all *ca;
6632         struct mbuf *m;
6633         int ret = 0;
6634         int added_control = 0;
6635         int un_sent, do_chunk_output = 1;
6636         struct sctp_association *asoc;
6637         struct sctp_nets *net;
6638
6639         ca = (struct sctp_copy_all *)ptr;
6640         if (ca->m == NULL) {
6641                 return;
6642         }
6643         if (ca->inp != inp) {
6644                 /* TSNH */
6645                 return;
6646         }
6647         if (ca->sndlen > 0) {
6648                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6649                 if (m == NULL) {
6650                         /* can't copy so we are done */
6651                         ca->cnt_failed++;
6652                         return;
6653                 }
6654 #ifdef SCTP_MBUF_LOGGING
6655                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6656                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6657                 }
6658 #endif
6659         } else {
6660                 m = NULL;
6661         }
6662         SCTP_TCB_LOCK_ASSERT(stcb);
6663         if (stcb->asoc.alternate) {
6664                 net = stcb->asoc.alternate;
6665         } else {
6666                 net = stcb->asoc.primary_destination;
6667         }
6668         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6669                 /* Abort this assoc with m as the user defined reason */
6670                 if (m != NULL) {
6671                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6672                 } else {
6673                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6674                             0, M_NOWAIT, 1, MT_DATA);
6675                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6676                 }
6677                 if (m != NULL) {
6678                         struct sctp_paramhdr *ph;
6679
6680                         ph = mtod(m, struct sctp_paramhdr *);
6681                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6682                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6683                 }
6684                 /*
6685                  * We add one here to keep the assoc from dis-appearing on
6686                  * us.
6687                  */
6688                 atomic_add_int(&stcb->asoc.refcnt, 1);
6689                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6690                 /*
6691                  * sctp_abort_an_association calls sctp_free_asoc() free
6692                  * association will NOT free it since we incremented the
6693                  * refcnt .. we do this to prevent it being freed and things
6694                  * getting tricky since we could end up (from free_asoc)
6695                  * calling inpcb_free which would get a recursive lock call
6696                  * to the iterator lock.. But as a consequence of that the
6697                  * stcb will return to us un-locked.. since free_asoc
6698                  * returns with either no TCB or the TCB unlocked, we must
6699                  * relock.. to unlock in the iterator timer :-0
6700                  */
6701                 SCTP_TCB_LOCK(stcb);
6702                 atomic_add_int(&stcb->asoc.refcnt, -1);
6703                 goto no_chunk_output;
6704         } else {
6705                 if (m) {
6706                         ret = sctp_msg_append(stcb, net, m,
6707                             &ca->sndrcv, 1);
6708                 }
6709                 asoc = &stcb->asoc;
6710                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6711                         /* shutdown this assoc */
6712                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6713                             TAILQ_EMPTY(&asoc->sent_queue) &&
6714                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6715                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6716                                         goto abort_anyway;
6717                                 }
6718                                 /*
6719                                  * there is nothing queued to send, so I'm
6720                                  * done...
6721                                  */
6722                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6723                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6724                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6725                                         /*
6726                                          * only send SHUTDOWN the first time
6727                                          * through
6728                                          */
6729                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6730                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6731                                         }
6732                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6733                                         sctp_stop_timers_for_shutdown(stcb);
6734                                         sctp_send_shutdown(stcb, net);
6735                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6736                                             net);
6737                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6738                                             asoc->primary_destination);
6739                                         added_control = 1;
6740                                         do_chunk_output = 0;
6741                                 }
6742                         } else {
6743                                 /*
6744                                  * we still got (or just got) data to send,
6745                                  * so set SHUTDOWN_PENDING
6746                                  */
6747                                 /*
6748                                  * XXX sockets draft says that SCTP_EOF
6749                                  * should be sent with no data.  currently,
6750                                  * we will allow user data to be sent first
6751                                  * and move to SHUTDOWN-PENDING
6752                                  */
6753                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6754                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6755                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6756                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6757                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6758                                         }
6759                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6760                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6761                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6762                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6763                                                 struct mbuf *op_err;
6764                                                 char msg[SCTP_DIAG_INFO_LEN];
6765
6766                                 abort_anyway:
6767                                                 snprintf(msg, sizeof(msg),
6768                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6769                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6770                                                     msg);
6771                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6772                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6773                                                     op_err, SCTP_SO_NOT_LOCKED);
6774                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6775                                                 goto no_chunk_output;
6776                                         }
6777                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6778                                             asoc->primary_destination);
6779                                 }
6780                         }
6781
6782                 }
6783         }
6784         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6785             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6786
6787         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6788             (stcb->asoc.total_flight > 0) &&
6789             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6790                 do_chunk_output = 0;
6791         }
6792         if (do_chunk_output)
6793                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6794         else if (added_control) {
6795                 int num_out, reason, now_filled = 0;
6796                 struct timeval now;
6797                 int frag_point;
6798
6799                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6800                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6801                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6802         }
6803 no_chunk_output:
6804         if (ret) {
6805                 ca->cnt_failed++;
6806         } else {
6807                 ca->cnt_sent++;
6808         }
6809 }
6810
6811 static void
6812 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6813 {
6814         struct sctp_copy_all *ca;
6815
6816         ca = (struct sctp_copy_all *)ptr;
6817         /*
6818          * Do a notify here? Kacheong suggests that the notify be done at
6819          * the send time.. so you would push up a notification if any send
6820          * failed. Don't know if this is feasible since the only failures we
6821          * have is "memory" related and if you cannot get an mbuf to send
6822          * the data you surely can't get an mbuf to send up to notify the
6823          * user you can't send the data :->
6824          */
6825
6826         /* now free everything */
6827         if (ca->inp) {
6828                 /* Lets clear the flag to allow others to run. */
6829                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6830         }
6831         sctp_m_freem(ca->m);
6832         SCTP_FREE(ca, SCTP_M_COPYAL);
6833 }
6834
6835 static struct mbuf *
6836 sctp_copy_out_all(struct uio *uio, ssize_t len)
6837 {
6838         struct mbuf *ret, *at;
6839         ssize_t left, willcpy, cancpy, error;
6840
6841         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6842         if (ret == NULL) {
6843                 /* TSNH */
6844                 return (NULL);
6845         }
6846         left = len;
6847         SCTP_BUF_LEN(ret) = 0;
6848         /* save space for the data chunk header */
6849         cancpy = (int)M_TRAILINGSPACE(ret);
6850         willcpy = min(cancpy, left);
6851         at = ret;
6852         while (left > 0) {
6853                 /* Align data to the end */
6854                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6855                 if (error) {
6856         err_out_now:
6857                         sctp_m_freem(at);
6858                         return (NULL);
6859                 }
6860                 SCTP_BUF_LEN(at) = (int)willcpy;
6861                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6862                 left -= willcpy;
6863                 if (left > 0) {
6864                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6865                         if (SCTP_BUF_NEXT(at) == NULL) {
6866                                 goto err_out_now;
6867                         }
6868                         at = SCTP_BUF_NEXT(at);
6869                         SCTP_BUF_LEN(at) = 0;
6870                         cancpy = (int)M_TRAILINGSPACE(at);
6871                         willcpy = min(cancpy, left);
6872                 }
6873         }
6874         return (ret);
6875 }
6876
6877 static int
6878 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6879     struct sctp_sndrcvinfo *srcv)
6880 {
6881         int ret;
6882         struct sctp_copy_all *ca;
6883
6884         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6885                 /* There is another. */
6886                 return (EBUSY);
6887         }
6888         if (uio->uio_resid > SCTP_MAX_SENDALL_LIMIT) {
6889                 /* You must be less than the max! */
6890                 return (EMSGSIZE);
6891         }
6892         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6893             SCTP_M_COPYAL);
6894         if (ca == NULL) {
6895                 sctp_m_freem(m);
6896                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6897                 return (ENOMEM);
6898         }
6899         memset(ca, 0, sizeof(struct sctp_copy_all));
6900
6901         ca->inp = inp;
6902         if (srcv) {
6903                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6904         }
6905         /*
6906          * take off the sendall flag, it would be bad if we failed to do
6907          * this :-0
6908          */
6909         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6910         /* get length and mbuf chain */
6911         if (uio) {
6912                 ca->sndlen = uio->uio_resid;
6913                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6914                 if (ca->m == NULL) {
6915                         SCTP_FREE(ca, SCTP_M_COPYAL);
6916                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6917                         return (ENOMEM);
6918                 }
6919         } else {
6920                 /* Gather the length of the send */
6921                 struct mbuf *mat;
6922
6923                 ca->sndlen = 0;
6924                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6925                         ca->sndlen += SCTP_BUF_LEN(mat);
6926                 }
6927         }
6928         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6929         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6930             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6931             SCTP_ASOC_ANY_STATE,
6932             (void *)ca, 0,
6933             sctp_sendall_completes, inp, 1);
6934         if (ret) {
6935                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6936                 SCTP_FREE(ca, SCTP_M_COPYAL);
6937                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6938                 return (EFAULT);
6939         }
6940         return (0);
6941 }
6942
6943
6944 void
6945 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6946 {
6947         struct sctp_tmit_chunk *chk, *nchk;
6948
6949         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6950                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6951                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6952                         asoc->ctrl_queue_cnt--;
6953                         if (chk->data) {
6954                                 sctp_m_freem(chk->data);
6955                                 chk->data = NULL;
6956                         }
6957                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6958                 }
6959         }
6960 }
6961
6962 void
6963 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6964 {
6965         struct sctp_association *asoc;
6966         struct sctp_tmit_chunk *chk, *nchk;
6967         struct sctp_asconf_chunk *acp;
6968
6969         asoc = &stcb->asoc;
6970         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6971                 /* find SCTP_ASCONF chunk in queue */
6972                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6973                         if (chk->data) {
6974                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6975                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6976                                         /* Not Acked yet */
6977                                         break;
6978                                 }
6979                         }
6980                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6981                         asoc->ctrl_queue_cnt--;
6982                         if (chk->data) {
6983                                 sctp_m_freem(chk->data);
6984                                 chk->data = NULL;
6985                         }
6986                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6987                 }
6988         }
6989 }
6990
6991
6992 static void
6993 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6994     struct sctp_association *asoc,
6995     struct sctp_tmit_chunk **data_list,
6996     int bundle_at,
6997     struct sctp_nets *net)
6998 {
6999         int i;
7000         struct sctp_tmit_chunk *tp1;
7001
7002         for (i = 0; i < bundle_at; i++) {
7003                 /* off of the send queue */
7004                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
7005                 asoc->send_queue_cnt--;
7006                 if (i > 0) {
7007                         /*
7008                          * Any chunk NOT 0 you zap the time chunk 0 gets
7009                          * zapped or set based on if a RTO measurment is
7010                          * needed.
7011                          */
7012                         data_list[i]->do_rtt = 0;
7013                 }
7014                 /* record time */
7015                 data_list[i]->sent_rcv_time = net->last_sent_time;
7016                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
7017                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
7018                 if (data_list[i]->whoTo == NULL) {
7019                         data_list[i]->whoTo = net;
7020                         atomic_add_int(&net->ref_count, 1);
7021                 }
7022                 /* on to the sent queue */
7023                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7024                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7025                         struct sctp_tmit_chunk *tpp;
7026
7027                         /* need to move back */
7028         back_up_more:
7029                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7030                         if (tpp == NULL) {
7031                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7032                                 goto all_done;
7033                         }
7034                         tp1 = tpp;
7035                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7036                                 goto back_up_more;
7037                         }
7038                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7039                 } else {
7040                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7041                             data_list[i],
7042                             sctp_next);
7043                 }
7044 all_done:
7045                 /* This does not lower until the cum-ack passes it */
7046                 asoc->sent_queue_cnt++;
7047                 if ((asoc->peers_rwnd <= 0) &&
7048                     (asoc->total_flight == 0) &&
7049                     (bundle_at == 1)) {
7050                         /* Mark the chunk as being a window probe */
7051                         SCTP_STAT_INCR(sctps_windowprobed);
7052                 }
7053 #ifdef SCTP_AUDITING_ENABLED
7054                 sctp_audit_log(0xC2, 3);
7055 #endif
7056                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7057                 data_list[i]->snd_count = 1;
7058                 data_list[i]->rec.data.chunk_was_revoked = 0;
7059                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7060                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7061                             data_list[i]->whoTo->flight_size,
7062                             data_list[i]->book_size,
7063                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7064                             data_list[i]->rec.data.tsn);
7065                 }
7066                 sctp_flight_size_increase(data_list[i]);
7067                 sctp_total_flight_increase(stcb, data_list[i]);
7068                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7069                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7070                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7071                 }
7072                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7073                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7074                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7075                         /* SWS sender side engages */
7076                         asoc->peers_rwnd = 0;
7077                 }
7078         }
7079         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7080                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7081         }
7082 }
7083
7084 static void
7085 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7086 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7087     SCTP_UNUSED
7088 #endif
7089 )
7090 {
7091         struct sctp_tmit_chunk *chk, *nchk;
7092
7093         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7094                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7095                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7096                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7097                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7098                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7099                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7100                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7101                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7102                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7103                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7104                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7105                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7106                         /* Stray chunks must be cleaned up */
7107         clean_up_anyway:
7108                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7109                         asoc->ctrl_queue_cnt--;
7110                         if (chk->data) {
7111                                 sctp_m_freem(chk->data);
7112                                 chk->data = NULL;
7113                         }
7114                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7115                                 asoc->fwd_tsn_cnt--;
7116                         }
7117                         sctp_free_a_chunk(stcb, chk, so_locked);
7118                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7119                         /* special handling, we must look into the param */
7120                         if (chk != asoc->str_reset) {
7121                                 goto clean_up_anyway;
7122                         }
7123                 }
7124         }
7125 }
7126
7127 static uint32_t
7128 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7129     uint32_t space_left, uint32_t frag_point, int eeor_on)
7130 {
7131         /*
7132          * Make a decision on if I should split a msg into multiple parts.
7133          * This is only asked of incomplete messages.
7134          */
7135         if (eeor_on) {
7136                 /*
7137                  * If we are doing EEOR we need to always send it if its the
7138                  * entire thing, since it might be all the guy is putting in
7139                  * the hopper.
7140                  */
7141                 if (space_left >= length) {
7142                         /*-
7143                          * If we have data outstanding,
7144                          * we get another chance when the sack
7145                          * arrives to transmit - wait for more data
7146                          */
7147                         if (stcb->asoc.total_flight == 0) {
7148                                 /*
7149                                  * If nothing is in flight, we zero the
7150                                  * packet counter.
7151                                  */
7152                                 return (length);
7153                         }
7154                         return (0);
7155
7156                 } else {
7157                         /* You can fill the rest */
7158                         return (space_left);
7159                 }
7160         }
7161         /*-
7162          * For those strange folk that make the send buffer
7163          * smaller than our fragmentation point, we can't
7164          * get a full msg in so we have to allow splitting.
7165          */
7166         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7167                 return (length);
7168         }
7169         if ((length <= space_left) ||
7170             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7171                 /* Sub-optimial residual don't split in non-eeor mode. */
7172                 return (0);
7173         }
7174         /*
7175          * If we reach here length is larger than the space_left. Do we wish
7176          * to split it for the sake of packet putting together?
7177          */
7178         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7179                 /* Its ok to split it */
7180                 return (min(space_left, frag_point));
7181         }
7182         /* Nope, can't split */
7183         return (0);
7184 }
7185
7186 static uint32_t
7187 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7188     struct sctp_stream_out *strq,
7189     uint32_t space_left,
7190     uint32_t frag_point,
7191     int *giveup,
7192     int eeor_mode,
7193     int *bail,
7194     int so_locked
7195 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7196     SCTP_UNUSED
7197 #endif
7198 )
7199 {
7200         /* Move from the stream to the send_queue keeping track of the total */
7201         struct sctp_association *asoc;
7202         struct sctp_stream_queue_pending *sp;
7203         struct sctp_tmit_chunk *chk;
7204         struct sctp_data_chunk *dchkh = NULL;
7205         struct sctp_idata_chunk *ndchkh = NULL;
7206         uint32_t to_move, length;
7207         int leading;
7208         uint8_t rcv_flags = 0;
7209         uint8_t some_taken;
7210         uint8_t send_lock_up = 0;
7211
7212         SCTP_TCB_LOCK_ASSERT(stcb);
7213         asoc = &stcb->asoc;
7214 one_more_time:
7215         /* sa_ignore FREED_MEMORY */
7216         sp = TAILQ_FIRST(&strq->outqueue);
7217         if (sp == NULL) {
7218                 if (send_lock_up == 0) {
7219                         SCTP_TCB_SEND_LOCK(stcb);
7220                         send_lock_up = 1;
7221                 }
7222                 sp = TAILQ_FIRST(&strq->outqueue);
7223                 if (sp) {
7224                         goto one_more_time;
7225                 }
7226                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7227                     (stcb->asoc.idata_supported == 0) &&
7228                     (strq->last_msg_incomplete)) {
7229                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7230                             strq->sid,
7231                             strq->last_msg_incomplete);
7232                         strq->last_msg_incomplete = 0;
7233                 }
7234                 to_move = 0;
7235                 if (send_lock_up) {
7236                         SCTP_TCB_SEND_UNLOCK(stcb);
7237                         send_lock_up = 0;
7238                 }
7239                 goto out_of;
7240         }
7241         if ((sp->msg_is_complete) && (sp->length == 0)) {
7242                 if (sp->sender_all_done) {
7243                         /*
7244                          * We are doing deferred cleanup. Last time through
7245                          * when we took all the data the sender_all_done was
7246                          * not set.
7247                          */
7248                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7249                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7250                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7251                                     sp->sender_all_done,
7252                                     sp->length,
7253                                     sp->msg_is_complete,
7254                                     sp->put_last_out,
7255                                     send_lock_up);
7256                         }
7257                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7258                                 SCTP_TCB_SEND_LOCK(stcb);
7259                                 send_lock_up = 1;
7260                         }
7261                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7262                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7263                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7264                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7265                             (strq->chunks_on_queues == 0) &&
7266                             TAILQ_EMPTY(&strq->outqueue)) {
7267                                 stcb->asoc.trigger_reset = 1;
7268                         }
7269                         if (sp->net) {
7270                                 sctp_free_remote_addr(sp->net);
7271                                 sp->net = NULL;
7272                         }
7273                         if (sp->data) {
7274                                 sctp_m_freem(sp->data);
7275                                 sp->data = NULL;
7276                         }
7277                         sctp_free_a_strmoq(stcb, sp, so_locked);
7278                         /* we can't be locked to it */
7279                         if (send_lock_up) {
7280                                 SCTP_TCB_SEND_UNLOCK(stcb);
7281                                 send_lock_up = 0;
7282                         }
7283                         /* back to get the next msg */
7284                         goto one_more_time;
7285                 } else {
7286                         /*
7287                          * sender just finished this but still holds a
7288                          * reference
7289                          */
7290                         *giveup = 1;
7291                         to_move = 0;
7292                         goto out_of;
7293                 }
7294         } else {
7295                 /* is there some to get */
7296                 if (sp->length == 0) {
7297                         /* no */
7298                         *giveup = 1;
7299                         to_move = 0;
7300                         goto out_of;
7301                 } else if (sp->discard_rest) {
7302                         if (send_lock_up == 0) {
7303                                 SCTP_TCB_SEND_LOCK(stcb);
7304                                 send_lock_up = 1;
7305                         }
7306                         /* Whack down the size */
7307                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7308                         if ((stcb->sctp_socket != NULL) &&
7309                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7310                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7311                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7312                         }
7313                         if (sp->data) {
7314                                 sctp_m_freem(sp->data);
7315                                 sp->data = NULL;
7316                                 sp->tail_mbuf = NULL;
7317                         }
7318                         sp->length = 0;
7319                         sp->some_taken = 1;
7320                         *giveup = 1;
7321                         to_move = 0;
7322                         goto out_of;
7323                 }
7324         }
7325         some_taken = sp->some_taken;
7326 re_look:
7327         length = sp->length;
7328         if (sp->msg_is_complete) {
7329                 /* The message is complete */
7330                 to_move = min(length, frag_point);
7331                 if (to_move == length) {
7332                         /* All of it fits in the MTU */
7333                         if (sp->some_taken) {
7334                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7335                         } else {
7336                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7337                         }
7338                         sp->put_last_out = 1;
7339                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7340                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7341                         }
7342                 } else {
7343                         /* Not all of it fits, we fragment */
7344                         if (sp->some_taken == 0) {
7345                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7346                         }
7347                         sp->some_taken = 1;
7348                 }
7349         } else {
7350                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7351                 if (to_move) {
7352                         /*-
7353                          * We use a snapshot of length in case it
7354                          * is expanding during the compare.
7355                          */
7356                         uint32_t llen;
7357
7358                         llen = length;
7359                         if (to_move >= llen) {
7360                                 to_move = llen;
7361                                 if (send_lock_up == 0) {
7362                                         /*-
7363                                          * We are taking all of an incomplete msg
7364                                          * thus we need a send lock.
7365                                          */
7366                                         SCTP_TCB_SEND_LOCK(stcb);
7367                                         send_lock_up = 1;
7368                                         if (sp->msg_is_complete) {
7369                                                 /*
7370                                                  * the sender finished the
7371                                                  * msg
7372                                                  */
7373                                                 goto re_look;
7374                                         }
7375                                 }
7376                         }
7377                         if (sp->some_taken == 0) {
7378                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7379                                 sp->some_taken = 1;
7380                         }
7381                 } else {
7382                         /* Nothing to take. */
7383                         *giveup = 1;
7384                         to_move = 0;
7385                         goto out_of;
7386                 }
7387         }
7388
7389         /* If we reach here, we can copy out a chunk */
7390         sctp_alloc_a_chunk(stcb, chk);
7391         if (chk == NULL) {
7392                 /* No chunk memory */
7393                 *giveup = 1;
7394                 to_move = 0;
7395                 goto out_of;
7396         }
7397         /*
7398          * Setup for unordered if needed by looking at the user sent info
7399          * flags.
7400          */
7401         if (sp->sinfo_flags & SCTP_UNORDERED) {
7402                 rcv_flags |= SCTP_DATA_UNORDERED;
7403         }
7404         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7405             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7406                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7407         }
7408         /* clear out the chunk before setting up */
7409         memset(chk, 0, sizeof(*chk));
7410         chk->rec.data.rcv_flags = rcv_flags;
7411
7412         if (to_move >= length) {
7413                 /* we think we can steal the whole thing */
7414                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7415                         SCTP_TCB_SEND_LOCK(stcb);
7416                         send_lock_up = 1;
7417                 }
7418                 if (to_move < sp->length) {
7419                         /* bail, it changed */
7420                         goto dont_do_it;
7421                 }
7422                 chk->data = sp->data;
7423                 chk->last_mbuf = sp->tail_mbuf;
7424                 /* register the stealing */
7425                 sp->data = sp->tail_mbuf = NULL;
7426         } else {
7427                 struct mbuf *m;
7428
7429 dont_do_it:
7430                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7431                 chk->last_mbuf = NULL;
7432                 if (chk->data == NULL) {
7433                         sp->some_taken = some_taken;
7434                         sctp_free_a_chunk(stcb, chk, so_locked);
7435                         *bail = 1;
7436                         to_move = 0;
7437                         goto out_of;
7438                 }
7439 #ifdef SCTP_MBUF_LOGGING
7440                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7441                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7442                 }
7443 #endif
7444                 /* Pull off the data */
7445                 m_adj(sp->data, to_move);
7446                 /* Now lets work our way down and compact it */
7447                 m = sp->data;
7448                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7449                         sp->data = SCTP_BUF_NEXT(m);
7450                         SCTP_BUF_NEXT(m) = NULL;
7451                         if (sp->tail_mbuf == m) {
7452                                 /*-
7453                                  * Freeing tail? TSNH since
7454                                  * we supposedly were taking less
7455                                  * than the sp->length.
7456                                  */
7457 #ifdef INVARIANTS
7458                                 panic("Huh, freing tail? - TSNH");
7459 #else
7460                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7461                                 sp->tail_mbuf = sp->data = NULL;
7462                                 sp->length = 0;
7463 #endif
7464
7465                         }
7466                         sctp_m_free(m);
7467                         m = sp->data;
7468                 }
7469         }
7470         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7471                 chk->copy_by_ref = 1;
7472         } else {
7473                 chk->copy_by_ref = 0;
7474         }
7475         /*
7476          * get last_mbuf and counts of mb usage This is ugly but hopefully
7477          * its only one mbuf.
7478          */
7479         if (chk->last_mbuf == NULL) {
7480                 chk->last_mbuf = chk->data;
7481                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7482                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7483                 }
7484         }
7485
7486         if (to_move > length) {
7487                 /*- This should not happen either
7488                  * since we always lower to_move to the size
7489                  * of sp->length if its larger.
7490                  */
7491 #ifdef INVARIANTS
7492                 panic("Huh, how can to_move be larger?");
7493 #else
7494                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7495                 sp->length = 0;
7496 #endif
7497         } else {
7498                 atomic_subtract_int(&sp->length, to_move);
7499         }
7500         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7501         if (M_LEADINGSPACE(chk->data) < leading) {
7502                 /* Not enough room for a chunk header, get some */
7503                 struct mbuf *m;
7504
7505                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7506                 if (m == NULL) {
7507                         /*
7508                          * we're in trouble here. _PREPEND below will free
7509                          * all the data if there is no leading space, so we
7510                          * must put the data back and restore.
7511                          */
7512                         if (send_lock_up == 0) {
7513                                 SCTP_TCB_SEND_LOCK(stcb);
7514                                 send_lock_up = 1;
7515                         }
7516                         if (sp->data == NULL) {
7517                                 /* unsteal the data */
7518                                 sp->data = chk->data;
7519                                 sp->tail_mbuf = chk->last_mbuf;
7520                         } else {
7521                                 struct mbuf *m_tmp;
7522
7523                                 /* reassemble the data */
7524                                 m_tmp = sp->data;
7525                                 sp->data = chk->data;
7526                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7527                         }
7528                         sp->some_taken = some_taken;
7529                         atomic_add_int(&sp->length, to_move);
7530                         chk->data = NULL;
7531                         *bail = 1;
7532                         sctp_free_a_chunk(stcb, chk, so_locked);
7533                         to_move = 0;
7534                         goto out_of;
7535                 } else {
7536                         SCTP_BUF_LEN(m) = 0;
7537                         SCTP_BUF_NEXT(m) = chk->data;
7538                         chk->data = m;
7539                         M_ALIGN(chk->data, 4);
7540                 }
7541         }
7542         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7543         if (chk->data == NULL) {
7544                 /* HELP, TSNH since we assured it would not above? */
7545 #ifdef INVARIANTS
7546                 panic("prepend failes HELP?");
7547 #else
7548                 SCTP_PRINTF("prepend fails HELP?\n");
7549                 sctp_free_a_chunk(stcb, chk, so_locked);
7550 #endif
7551                 *bail = 1;
7552                 to_move = 0;
7553                 goto out_of;
7554         }
7555         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7556         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7557         chk->book_size_scale = 0;
7558         chk->sent = SCTP_DATAGRAM_UNSENT;
7559
7560         chk->flags = 0;
7561         chk->asoc = &stcb->asoc;
7562         chk->pad_inplace = 0;
7563         chk->no_fr_allowed = 0;
7564         if (stcb->asoc.idata_supported == 0) {
7565                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7566                         /* Just use 0. The receiver ignores the values. */
7567                         chk->rec.data.mid = 0;
7568                 } else {
7569                         chk->rec.data.mid = strq->next_mid_ordered;
7570                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7571                                 strq->next_mid_ordered++;
7572                         }
7573                 }
7574         } else {
7575                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7576                         chk->rec.data.mid = strq->next_mid_unordered;
7577                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7578                                 strq->next_mid_unordered++;
7579                         }
7580                 } else {
7581                         chk->rec.data.mid = strq->next_mid_ordered;
7582                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7583                                 strq->next_mid_ordered++;
7584                         }
7585                 }
7586         }
7587         chk->rec.data.sid = sp->sid;
7588         chk->rec.data.ppid = sp->ppid;
7589         chk->rec.data.context = sp->context;
7590         chk->rec.data.doing_fast_retransmit = 0;
7591
7592         chk->rec.data.timetodrop = sp->ts;
7593         chk->flags = sp->act_flags;
7594
7595         if (sp->net) {
7596                 chk->whoTo = sp->net;
7597                 atomic_add_int(&chk->whoTo->ref_count, 1);
7598         } else
7599                 chk->whoTo = NULL;
7600
7601         if (sp->holds_key_ref) {
7602                 chk->auth_keyid = sp->auth_keyid;
7603                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7604                 chk->holds_key_ref = 1;
7605         }
7606         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7607         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7608                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7609                     (uint32_t)(uintptr_t)stcb, sp->length,
7610                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7611                     chk->rec.data.tsn);
7612         }
7613         if (stcb->asoc.idata_supported == 0) {
7614                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7615         } else {
7616                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7617         }
7618         /*
7619          * Put the rest of the things in place now. Size was done earlier in
7620          * previous loop prior to padding.
7621          */
7622
7623 #ifdef SCTP_ASOCLOG_OF_TSNS
7624         SCTP_TCB_LOCK_ASSERT(stcb);
7625         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7626                 asoc->tsn_out_at = 0;
7627                 asoc->tsn_out_wrapped = 1;
7628         }
7629         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7630         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7631         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7632         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7633         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7634         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7635         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7636         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7637         asoc->tsn_out_at++;
7638 #endif
7639         if (stcb->asoc.idata_supported == 0) {
7640                 dchkh->ch.chunk_type = SCTP_DATA;
7641                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7642                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7643                 dchkh->dp.sid = htons(strq->sid);
7644                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7645                 dchkh->dp.ppid = chk->rec.data.ppid;
7646                 dchkh->ch.chunk_length = htons(chk->send_size);
7647         } else {
7648                 ndchkh->ch.chunk_type = SCTP_IDATA;
7649                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7650                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7651                 ndchkh->dp.sid = htons(strq->sid);
7652                 ndchkh->dp.reserved = htons(0);
7653                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7654                 if (sp->fsn == 0)
7655                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7656                 else
7657                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7658                 sp->fsn++;
7659                 ndchkh->ch.chunk_length = htons(chk->send_size);
7660         }
7661         /* Now advance the chk->send_size by the actual pad needed. */
7662         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7663                 /* need a pad */
7664                 struct mbuf *lm;
7665                 int pads;
7666
7667                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7668                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7669                 if (lm != NULL) {
7670                         chk->last_mbuf = lm;
7671                         chk->pad_inplace = 1;
7672                 }
7673                 chk->send_size += pads;
7674         }
7675         if (PR_SCTP_ENABLED(chk->flags)) {
7676                 asoc->pr_sctp_cnt++;
7677         }
7678         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7679                 /* All done pull and kill the message */
7680                 if (sp->put_last_out == 0) {
7681                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7682                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7683                             sp->sender_all_done,
7684                             sp->length,
7685                             sp->msg_is_complete,
7686                             sp->put_last_out,
7687                             send_lock_up);
7688                 }
7689                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7690                         SCTP_TCB_SEND_LOCK(stcb);
7691                         send_lock_up = 1;
7692                 }
7693                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7694                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7695                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7696                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7697                     (strq->chunks_on_queues == 0) &&
7698                     TAILQ_EMPTY(&strq->outqueue)) {
7699                         stcb->asoc.trigger_reset = 1;
7700                 }
7701                 if (sp->net) {
7702                         sctp_free_remote_addr(sp->net);
7703                         sp->net = NULL;
7704                 }
7705                 if (sp->data) {
7706                         sctp_m_freem(sp->data);
7707                         sp->data = NULL;
7708                 }
7709                 sctp_free_a_strmoq(stcb, sp, so_locked);
7710         }
7711         asoc->chunks_on_out_queue++;
7712         strq->chunks_on_queues++;
7713         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7714         asoc->send_queue_cnt++;
7715 out_of:
7716         if (send_lock_up) {
7717                 SCTP_TCB_SEND_UNLOCK(stcb);
7718         }
7719         return (to_move);
7720 }
7721
7722
7723 static void
7724 sctp_fill_outqueue(struct sctp_tcb *stcb,
7725     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7726 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7727     SCTP_UNUSED
7728 #endif
7729 )
7730 {
7731         struct sctp_association *asoc;
7732         struct sctp_stream_out *strq;
7733         uint32_t space_left, moved, total_moved;
7734         int bail, giveup;
7735
7736         SCTP_TCB_LOCK_ASSERT(stcb);
7737         asoc = &stcb->asoc;
7738         total_moved = 0;
7739         switch (net->ro._l_addr.sa.sa_family) {
7740 #ifdef INET
7741         case AF_INET:
7742                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7743                 break;
7744 #endif
7745 #ifdef INET6
7746         case AF_INET6:
7747                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7748                 break;
7749 #endif
7750         default:
7751                 /* TSNH */
7752                 space_left = net->mtu;
7753                 break;
7754         }
7755         /* Need an allowance for the data chunk header too */
7756         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7757
7758         /* must make even word boundary */
7759         space_left &= 0xfffffffc;
7760         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7761         giveup = 0;
7762         bail = 0;
7763         while ((space_left > 0) && (strq != NULL)) {
7764                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7765                     &giveup, eeor_mode, &bail, so_locked);
7766                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7767                 if ((giveup != 0) || (bail != 0)) {
7768                         break;
7769                 }
7770                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7771                 total_moved += moved;
7772                 space_left -= moved;
7773                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7774                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7775                 } else {
7776                         space_left = 0;
7777                 }
7778                 space_left &= 0xfffffffc;
7779         }
7780         if (bail != 0)
7781                 *quit_now = 1;
7782
7783         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7784
7785         if (total_moved == 0) {
7786                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7787                     (net == stcb->asoc.primary_destination)) {
7788                         /* ran dry for primary network net */
7789                         SCTP_STAT_INCR(sctps_primary_randry);
7790                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7791                         /* ran dry with CMT on */
7792                         SCTP_STAT_INCR(sctps_cmt_randry);
7793                 }
7794         }
7795 }
7796
7797 void
7798 sctp_fix_ecn_echo(struct sctp_association *asoc)
7799 {
7800         struct sctp_tmit_chunk *chk;
7801
7802         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7803                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7804                         chk->sent = SCTP_DATAGRAM_UNSENT;
7805                 }
7806         }
7807 }
7808
7809 void
7810 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7811 {
7812         struct sctp_association *asoc;
7813         struct sctp_tmit_chunk *chk;
7814         struct sctp_stream_queue_pending *sp;
7815         unsigned int i;
7816
7817         if (net == NULL) {
7818                 return;
7819         }
7820         asoc = &stcb->asoc;
7821         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7822                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7823                         if (sp->net == net) {
7824                                 sctp_free_remote_addr(sp->net);
7825                                 sp->net = NULL;
7826                         }
7827                 }
7828         }
7829         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7830                 if (chk->whoTo == net) {
7831                         sctp_free_remote_addr(chk->whoTo);
7832                         chk->whoTo = NULL;
7833                 }
7834         }
7835 }
7836
7837 int
7838 sctp_med_chunk_output(struct sctp_inpcb *inp,
7839     struct sctp_tcb *stcb,
7840     struct sctp_association *asoc,
7841     int *num_out,
7842     int *reason_code,
7843     int control_only, int from_where,
7844     struct timeval *now, int *now_filled, int frag_point, int so_locked
7845 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7846     SCTP_UNUSED
7847 #endif
7848 )
7849 {
7850         /**
7851          * Ok this is the generic chunk service queue. we must do the
7852          * following:
7853          * - Service the stream queue that is next, moving any
7854          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7855          *   LAST to the out queue in one pass) and assigning TSN's. This
7856          *   only applys though if the peer does not support NDATA. For NDATA
7857          *   chunks its ok to not send the entire message ;-)
7858          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7859          *   fomulate and send the low level chunks. Making sure to combine
7860          *   any control in the control chunk queue also.
7861          */
7862         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7863         struct mbuf *outchain, *endoutchain;
7864         struct sctp_tmit_chunk *chk, *nchk;
7865
7866         /* temp arrays for unlinking */
7867         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7868         int no_fragmentflg, error;
7869         unsigned int max_rwnd_per_dest, max_send_per_dest;
7870         int one_chunk, hbflag, skip_data_for_this_net;
7871         int asconf, cookie, no_out_cnt;
7872         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7873         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7874         int tsns_sent = 0;
7875         uint32_t auth_offset;
7876         struct sctp_auth_chunk *auth;
7877         uint16_t auth_keyid;
7878         int override_ok = 1;
7879         int skip_fill_up = 0;
7880         int data_auth_reqd = 0;
7881
7882         /*
7883          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7884          * destination.
7885          */
7886         int quit_now = 0;
7887
7888         *num_out = 0;
7889         *reason_code = 0;
7890         auth_keyid = stcb->asoc.authinfo.active_keyid;
7891         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7892             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7893             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7894                 eeor_mode = 1;
7895         } else {
7896                 eeor_mode = 0;
7897         }
7898         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7899         /*
7900          * First lets prime the pump. For each destination, if there is room
7901          * in the flight size, attempt to pull an MTU's worth out of the
7902          * stream queues into the general send_queue
7903          */
7904 #ifdef SCTP_AUDITING_ENABLED
7905         sctp_audit_log(0xC2, 2);
7906 #endif
7907         SCTP_TCB_LOCK_ASSERT(stcb);
7908         hbflag = 0;
7909         if (control_only)
7910                 no_data_chunks = 1;
7911         else
7912                 no_data_chunks = 0;
7913
7914         /* Nothing to possible to send? */
7915         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7916             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7917             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7918             TAILQ_EMPTY(&asoc->send_queue) &&
7919             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7920 nothing_to_send:
7921                 *reason_code = 9;
7922                 return (0);
7923         }
7924         if (asoc->peers_rwnd == 0) {
7925                 /* No room in peers rwnd */
7926                 *reason_code = 1;
7927                 if (asoc->total_flight > 0) {
7928                         /* we are allowed one chunk in flight */
7929                         no_data_chunks = 1;
7930                 }
7931         }
7932         if (stcb->asoc.ecn_echo_cnt_onq) {
7933                 /* Record where a sack goes, if any */
7934                 if (no_data_chunks &&
7935                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7936                         /* Nothing but ECNe to send - we don't do that */
7937                         goto nothing_to_send;
7938                 }
7939                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7940                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7941                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7942                                 sack_goes_to = chk->whoTo;
7943                                 break;
7944                         }
7945                 }
7946         }
7947         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7948         if (stcb->sctp_socket)
7949                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7950         else
7951                 max_send_per_dest = 0;
7952         if (no_data_chunks == 0) {
7953                 /* How many non-directed chunks are there? */
7954                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7955                         if (chk->whoTo == NULL) {
7956                                 /*
7957                                  * We already have non-directed chunks on
7958                                  * the queue, no need to do a fill-up.
7959                                  */
7960                                 skip_fill_up = 1;
7961                                 break;
7962                         }
7963                 }
7964
7965         }
7966         if ((no_data_chunks == 0) &&
7967             (skip_fill_up == 0) &&
7968             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7969                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7970                         /*
7971                          * This for loop we are in takes in each net, if
7972                          * its's got space in cwnd and has data sent to it
7973                          * (when CMT is off) then it calls
7974                          * sctp_fill_outqueue for the net. This gets data on
7975                          * the send queue for that network.
7976                          *
7977                          * In sctp_fill_outqueue TSN's are assigned and data
7978                          * is copied out of the stream buffers. Note mostly
7979                          * copy by reference (we hope).
7980                          */
7981                         net->window_probe = 0;
7982                         if ((net != stcb->asoc.alternate) &&
7983                             ((net->dest_state & SCTP_ADDR_PF) ||
7984                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7985                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7986                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7987                                         sctp_log_cwnd(stcb, net, 1,
7988                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7989                                 }
7990                                 continue;
7991                         }
7992                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7993                             (net->flight_size == 0)) {
7994                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7995                         }
7996                         if (net->flight_size >= net->cwnd) {
7997                                 /* skip this network, no room - can't fill */
7998                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7999                                         sctp_log_cwnd(stcb, net, 3,
8000                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8001                                 }
8002                                 continue;
8003                         }
8004                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8005                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8006                         }
8007                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
8008                         if (quit_now) {
8009                                 /* memory alloc failure */
8010                                 no_data_chunks = 1;
8011                                 break;
8012                         }
8013                 }
8014         }
8015         /* now service each destination and send out what we can for it */
8016         /* Nothing to send? */
8017         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8018             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8019             TAILQ_EMPTY(&asoc->send_queue)) {
8020                 *reason_code = 8;
8021                 return (0);
8022         }
8023
8024         if (asoc->sctp_cmt_on_off > 0) {
8025                 /* get the last start point */
8026                 start_at = asoc->last_net_cmt_send_started;
8027                 if (start_at == NULL) {
8028                         /* null so to beginning */
8029                         start_at = TAILQ_FIRST(&asoc->nets);
8030                 } else {
8031                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8032                         if (start_at == NULL) {
8033                                 start_at = TAILQ_FIRST(&asoc->nets);
8034                         }
8035                 }
8036                 asoc->last_net_cmt_send_started = start_at;
8037         } else {
8038                 start_at = TAILQ_FIRST(&asoc->nets);
8039         }
8040         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8041                 if (chk->whoTo == NULL) {
8042                         if (asoc->alternate) {
8043                                 chk->whoTo = asoc->alternate;
8044                         } else {
8045                                 chk->whoTo = asoc->primary_destination;
8046                         }
8047                         atomic_add_int(&chk->whoTo->ref_count, 1);
8048                 }
8049         }
8050         old_start_at = NULL;
8051 again_one_more_time:
8052         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8053                 /* how much can we send? */
8054                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8055                 if (old_start_at && (old_start_at == net)) {
8056                         /* through list ocmpletely. */
8057                         break;
8058                 }
8059                 tsns_sent = 0xa;
8060                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8061                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8062                     (net->flight_size >= net->cwnd)) {
8063                         /*
8064                          * Nothing on control or asconf and flight is full,
8065                          * we can skip even in the CMT case.
8066                          */
8067                         continue;
8068                 }
8069                 bundle_at = 0;
8070                 endoutchain = outchain = NULL;
8071                 auth = NULL;
8072                 auth_offset = 0;
8073                 no_fragmentflg = 1;
8074                 one_chunk = 0;
8075                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8076                         skip_data_for_this_net = 1;
8077                 } else {
8078                         skip_data_for_this_net = 0;
8079                 }
8080                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8081 #ifdef INET
8082                 case AF_INET:
8083                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8084                         break;
8085 #endif
8086 #ifdef INET6
8087                 case AF_INET6:
8088                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8089                         break;
8090 #endif
8091                 default:
8092                         /* TSNH */
8093                         mtu = net->mtu;
8094                         break;
8095                 }
8096                 mx_mtu = mtu;
8097                 to_out = 0;
8098                 if (mtu > asoc->peers_rwnd) {
8099                         if (asoc->total_flight > 0) {
8100                                 /* We have a packet in flight somewhere */
8101                                 r_mtu = asoc->peers_rwnd;
8102                         } else {
8103                                 /* We are always allowed to send one MTU out */
8104                                 one_chunk = 1;
8105                                 r_mtu = mtu;
8106                         }
8107                 } else {
8108                         r_mtu = mtu;
8109                 }
8110                 error = 0;
8111                 /************************/
8112                 /* ASCONF transmission */
8113                 /************************/
8114                 /* Now first lets go through the asconf queue */
8115                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8116                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8117                                 continue;
8118                         }
8119                         if (chk->whoTo == NULL) {
8120                                 if (asoc->alternate == NULL) {
8121                                         if (asoc->primary_destination != net) {
8122                                                 break;
8123                                         }
8124                                 } else {
8125                                         if (asoc->alternate != net) {
8126                                                 break;
8127                                         }
8128                                 }
8129                         } else {
8130                                 if (chk->whoTo != net) {
8131                                         break;
8132                                 }
8133                         }
8134                         if (chk->data == NULL) {
8135                                 break;
8136                         }
8137                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8138                             chk->sent != SCTP_DATAGRAM_RESEND) {
8139                                 break;
8140                         }
8141                         /*
8142                          * if no AUTH is yet included and this chunk
8143                          * requires it, make sure to account for it.  We
8144                          * don't apply the size until the AUTH chunk is
8145                          * actually added below in case there is no room for
8146                          * this chunk. NOTE: we overload the use of "omtu"
8147                          * here
8148                          */
8149                         if ((auth == NULL) &&
8150                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8151                             stcb->asoc.peer_auth_chunks)) {
8152                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8153                         } else
8154                                 omtu = 0;
8155                         /* Here we do NOT factor the r_mtu */
8156                         if ((chk->send_size < (int)(mtu - omtu)) ||
8157                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8158                                 /*
8159                                  * We probably should glom the mbuf chain
8160                                  * from the chk->data for control but the
8161                                  * problem is it becomes yet one more level
8162                                  * of tracking to do if for some reason
8163                                  * output fails. Then I have got to
8164                                  * reconstruct the merged control chain.. el
8165                                  * yucko.. for now we take the easy way and
8166                                  * do the copy
8167                                  */
8168                                 /*
8169                                  * Add an AUTH chunk, if chunk requires it
8170                                  * save the offset into the chain for AUTH
8171                                  */
8172                                 if ((auth == NULL) &&
8173                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8174                                     stcb->asoc.peer_auth_chunks))) {
8175                                         outchain = sctp_add_auth_chunk(outchain,
8176                                             &endoutchain,
8177                                             &auth,
8178                                             &auth_offset,
8179                                             stcb,
8180                                             chk->rec.chunk_id.id);
8181                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8182                                 }
8183                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8184                                     (int)chk->rec.chunk_id.can_take_data,
8185                                     chk->send_size, chk->copy_by_ref);
8186                                 if (outchain == NULL) {
8187                                         *reason_code = 8;
8188                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8189                                         return (ENOMEM);
8190                                 }
8191                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8192                                 /* update our MTU size */
8193                                 if (mtu > (chk->send_size + omtu))
8194                                         mtu -= (chk->send_size + omtu);
8195                                 else
8196                                         mtu = 0;
8197                                 to_out += (chk->send_size + omtu);
8198                                 /* Do clear IP_DF ? */
8199                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8200                                         no_fragmentflg = 0;
8201                                 }
8202                                 if (chk->rec.chunk_id.can_take_data)
8203                                         chk->data = NULL;
8204                                 /*
8205                                  * set hb flag since we can use these for
8206                                  * RTO
8207                                  */
8208                                 hbflag = 1;
8209                                 asconf = 1;
8210                                 /*
8211                                  * should sysctl this: don't bundle data
8212                                  * with ASCONF since it requires AUTH
8213                                  */
8214                                 no_data_chunks = 1;
8215                                 chk->sent = SCTP_DATAGRAM_SENT;
8216                                 if (chk->whoTo == NULL) {
8217                                         chk->whoTo = net;
8218                                         atomic_add_int(&net->ref_count, 1);
8219                                 }
8220                                 chk->snd_count++;
8221                                 if (mtu == 0) {
8222                                         /*
8223                                          * Ok we are out of room but we can
8224                                          * output without effecting the
8225                                          * flight size since this little guy
8226                                          * is a control only packet.
8227                                          */
8228                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8229                                         /*
8230                                          * do NOT clear the asconf flag as
8231                                          * it is used to do appropriate
8232                                          * source address selection.
8233                                          */
8234                                         if (*now_filled == 0) {
8235                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8236                                                 *now_filled = 1;
8237                                         }
8238                                         net->last_sent_time = *now;
8239                                         hbflag = 0;
8240                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8241                                             (struct sockaddr *)&net->ro._l_addr,
8242                                             outchain, auth_offset, auth,
8243                                             stcb->asoc.authinfo.active_keyid,
8244                                             no_fragmentflg, 0, asconf,
8245                                             inp->sctp_lport, stcb->rport,
8246                                             htonl(stcb->asoc.peer_vtag),
8247                                             net->port, NULL,
8248                                             0, 0,
8249                                             so_locked))) {
8250                                                 /*
8251                                                  * error, we could not
8252                                                  * output
8253                                                  */
8254                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8255                                                 if (from_where == 0) {
8256                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8257                                                 }
8258                                                 if (error == ENOBUFS) {
8259                                                         asoc->ifp_had_enobuf = 1;
8260                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8261                                                 }
8262                                                 /* error, could not output */
8263                                                 if (error == EHOSTUNREACH) {
8264                                                         /*
8265                                                          * Destination went
8266                                                          * unreachable
8267                                                          * during this send
8268                                                          */
8269                                                         sctp_move_chunks_from_net(stcb, net);
8270                                                 }
8271                                                 *reason_code = 7;
8272                                                 break;
8273                                         } else {
8274                                                 asoc->ifp_had_enobuf = 0;
8275                                         }
8276                                         /*
8277                                          * increase the number we sent, if a
8278                                          * cookie is sent we don't tell them
8279                                          * any was sent out.
8280                                          */
8281                                         outchain = endoutchain = NULL;
8282                                         auth = NULL;
8283                                         auth_offset = 0;
8284                                         if (!no_out_cnt)
8285                                                 *num_out += ctl_cnt;
8286                                         /* recalc a clean slate and setup */
8287                                         switch (net->ro._l_addr.sa.sa_family) {
8288 #ifdef INET
8289                                         case AF_INET:
8290                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8291                                                 break;
8292 #endif
8293 #ifdef INET6
8294                                         case AF_INET6:
8295                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8296                                                 break;
8297 #endif
8298                                         default:
8299                                                 /* TSNH */
8300                                                 mtu = net->mtu;
8301                                                 break;
8302                                         }
8303                                         to_out = 0;
8304                                         no_fragmentflg = 1;
8305                                 }
8306                         }
8307                 }
8308                 if (error != 0) {
8309                         /* try next net */
8310                         continue;
8311                 }
8312                 /************************/
8313                 /* Control transmission */
8314                 /************************/
8315                 /* Now first lets go through the control queue */
8316                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8317                         if ((sack_goes_to) &&
8318                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8319                             (chk->whoTo != sack_goes_to)) {
8320                                 /*
8321                                  * if we have a sack in queue, and we are
8322                                  * looking at an ecn echo that is NOT queued
8323                                  * to where the sack is going..
8324                                  */
8325                                 if (chk->whoTo == net) {
8326                                         /*
8327                                          * Don't transmit it to where its
8328                                          * going (current net)
8329                                          */
8330                                         continue;
8331                                 } else if (sack_goes_to == net) {
8332                                         /*
8333                                          * But do transmit it to this
8334                                          * address
8335                                          */
8336                                         goto skip_net_check;
8337                                 }
8338                         }
8339                         if (chk->whoTo == NULL) {
8340                                 if (asoc->alternate == NULL) {
8341                                         if (asoc->primary_destination != net) {
8342                                                 continue;
8343                                         }
8344                                 } else {
8345                                         if (asoc->alternate != net) {
8346                                                 continue;
8347                                         }
8348                                 }
8349                         } else {
8350                                 if (chk->whoTo != net) {
8351                                         continue;
8352                                 }
8353                         }
8354         skip_net_check:
8355                         if (chk->data == NULL) {
8356                                 continue;
8357                         }
8358                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8359                                 /*
8360                                  * It must be unsent. Cookies and ASCONF's
8361                                  * hang around but there timers will force
8362                                  * when marked for resend.
8363                                  */
8364                                 continue;
8365                         }
8366                         /*
8367                          * if no AUTH is yet included and this chunk
8368                          * requires it, make sure to account for it.  We
8369                          * don't apply the size until the AUTH chunk is
8370                          * actually added below in case there is no room for
8371                          * this chunk. NOTE: we overload the use of "omtu"
8372                          * here
8373                          */
8374                         if ((auth == NULL) &&
8375                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8376                             stcb->asoc.peer_auth_chunks)) {
8377                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8378                         } else
8379                                 omtu = 0;
8380                         /* Here we do NOT factor the r_mtu */
8381                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8382                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8383                                 /*
8384                                  * We probably should glom the mbuf chain
8385                                  * from the chk->data for control but the
8386                                  * problem is it becomes yet one more level
8387                                  * of tracking to do if for some reason
8388                                  * output fails. Then I have got to
8389                                  * reconstruct the merged control chain.. el
8390                                  * yucko.. for now we take the easy way and
8391                                  * do the copy
8392                                  */
8393                                 /*
8394                                  * Add an AUTH chunk, if chunk requires it
8395                                  * save the offset into the chain for AUTH
8396                                  */
8397                                 if ((auth == NULL) &&
8398                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8399                                     stcb->asoc.peer_auth_chunks))) {
8400                                         outchain = sctp_add_auth_chunk(outchain,
8401                                             &endoutchain,
8402                                             &auth,
8403                                             &auth_offset,
8404                                             stcb,
8405                                             chk->rec.chunk_id.id);
8406                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8407                                 }
8408                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8409                                     (int)chk->rec.chunk_id.can_take_data,
8410                                     chk->send_size, chk->copy_by_ref);
8411                                 if (outchain == NULL) {
8412                                         *reason_code = 8;
8413                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8414                                         return (ENOMEM);
8415                                 }
8416                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8417                                 /* update our MTU size */
8418                                 if (mtu > (chk->send_size + omtu))
8419                                         mtu -= (chk->send_size + omtu);
8420                                 else
8421                                         mtu = 0;
8422                                 to_out += (chk->send_size + omtu);
8423                                 /* Do clear IP_DF ? */
8424                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8425                                         no_fragmentflg = 0;
8426                                 }
8427                                 if (chk->rec.chunk_id.can_take_data)
8428                                         chk->data = NULL;
8429                                 /* Mark things to be removed, if needed */
8430                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8431                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8432                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8433                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8434                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8435                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8436                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8437                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8438                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8439                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8440                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8441                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8442                                                 hbflag = 1;
8443                                         }
8444                                         /* remove these chunks at the end */
8445                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8446                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8447                                                 /* turn off the timer */
8448                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8449                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8450                                                             inp, stcb, net,
8451                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8452                                                 }
8453                                         }
8454                                         ctl_cnt++;
8455                                 } else {
8456                                         /*
8457                                          * Other chunks, since they have
8458                                          * timers running (i.e. COOKIE) we
8459                                          * just "trust" that it gets sent or
8460                                          * retransmitted.
8461                                          */
8462                                         ctl_cnt++;
8463                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8464                                                 cookie = 1;
8465                                                 no_out_cnt = 1;
8466                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8467                                                 /*
8468                                                  * Increment ecne send count
8469                                                  * here this means we may be
8470                                                  * over-zealous in our
8471                                                  * counting if the send
8472                                                  * fails, but its the best
8473                                                  * place to do it (we used
8474                                                  * to do it in the queue of
8475                                                  * the chunk, but that did
8476                                                  * not tell how many times
8477                                                  * it was sent.
8478                                                  */
8479                                                 SCTP_STAT_INCR(sctps_sendecne);
8480                                         }
8481                                         chk->sent = SCTP_DATAGRAM_SENT;
8482                                         if (chk->whoTo == NULL) {
8483                                                 chk->whoTo = net;
8484                                                 atomic_add_int(&net->ref_count, 1);
8485                                         }
8486                                         chk->snd_count++;
8487                                 }
8488                                 if (mtu == 0) {
8489                                         /*
8490                                          * Ok we are out of room but we can
8491                                          * output without effecting the
8492                                          * flight size since this little guy
8493                                          * is a control only packet.
8494                                          */
8495                                         if (asconf) {
8496                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8497                                                 /*
8498                                                  * do NOT clear the asconf
8499                                                  * flag as it is used to do
8500                                                  * appropriate source
8501                                                  * address selection.
8502                                                  */
8503                                         }
8504                                         if (cookie) {
8505                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8506                                                 cookie = 0;
8507                                         }
8508                                         /* Only HB or ASCONF advances time */
8509                                         if (hbflag) {
8510                                                 if (*now_filled == 0) {
8511                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8512                                                         *now_filled = 1;
8513                                                 }
8514                                                 net->last_sent_time = *now;
8515                                                 hbflag = 0;
8516                                         }
8517                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8518                                             (struct sockaddr *)&net->ro._l_addr,
8519                                             outchain,
8520                                             auth_offset, auth,
8521                                             stcb->asoc.authinfo.active_keyid,
8522                                             no_fragmentflg, 0, asconf,
8523                                             inp->sctp_lport, stcb->rport,
8524                                             htonl(stcb->asoc.peer_vtag),
8525                                             net->port, NULL,
8526                                             0, 0,
8527                                             so_locked))) {
8528                                                 /*
8529                                                  * error, we could not
8530                                                  * output
8531                                                  */
8532                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8533                                                 if (from_where == 0) {
8534                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8535                                                 }
8536                                                 if (error == ENOBUFS) {
8537                                                         asoc->ifp_had_enobuf = 1;
8538                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8539                                                 }
8540                                                 if (error == EHOSTUNREACH) {
8541                                                         /*
8542                                                          * Destination went
8543                                                          * unreachable
8544                                                          * during this send
8545                                                          */
8546                                                         sctp_move_chunks_from_net(stcb, net);
8547                                                 }
8548                                                 *reason_code = 7;
8549                                                 break;
8550                                         } else {
8551                                                 asoc->ifp_had_enobuf = 0;
8552                                         }
8553                                         /*
8554                                          * increase the number we sent, if a
8555                                          * cookie is sent we don't tell them
8556                                          * any was sent out.
8557                                          */
8558                                         outchain = endoutchain = NULL;
8559                                         auth = NULL;
8560                                         auth_offset = 0;
8561                                         if (!no_out_cnt)
8562                                                 *num_out += ctl_cnt;
8563                                         /* recalc a clean slate and setup */
8564                                         switch (net->ro._l_addr.sa.sa_family) {
8565 #ifdef INET
8566                                         case AF_INET:
8567                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8568                                                 break;
8569 #endif
8570 #ifdef INET6
8571                                         case AF_INET6:
8572                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8573                                                 break;
8574 #endif
8575                                         default:
8576                                                 /* TSNH */
8577                                                 mtu = net->mtu;
8578                                                 break;
8579                                         }
8580                                         to_out = 0;
8581                                         no_fragmentflg = 1;
8582                                 }
8583                         }
8584                 }
8585                 if (error != 0) {
8586                         /* try next net */
8587                         continue;
8588                 }
8589                 /* JRI: if dest is in PF state, do not send data to it */
8590                 if ((asoc->sctp_cmt_on_off > 0) &&
8591                     (net != stcb->asoc.alternate) &&
8592                     (net->dest_state & SCTP_ADDR_PF)) {
8593                         goto no_data_fill;
8594                 }
8595                 if (net->flight_size >= net->cwnd) {
8596                         goto no_data_fill;
8597                 }
8598                 if ((asoc->sctp_cmt_on_off > 0) &&
8599                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8600                     (net->flight_size > max_rwnd_per_dest)) {
8601                         goto no_data_fill;
8602                 }
8603                 /*
8604                  * We need a specific accounting for the usage of the send
8605                  * buffer. We also need to check the number of messages per
8606                  * net. For now, this is better than nothing and it disabled
8607                  * by default...
8608                  */
8609                 if ((asoc->sctp_cmt_on_off > 0) &&
8610                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8611                     (max_send_per_dest > 0) &&
8612                     (net->flight_size > max_send_per_dest)) {
8613                         goto no_data_fill;
8614                 }
8615                 /*********************/
8616                 /* Data transmission */
8617                 /*********************/
8618                 /*
8619                  * if AUTH for DATA is required and no AUTH has been added
8620                  * yet, account for this in the mtu now... if no data can be
8621                  * bundled, this adjustment won't matter anyways since the
8622                  * packet will be going out...
8623                  */
8624                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8625                     stcb->asoc.peer_auth_chunks);
8626                 if (data_auth_reqd && (auth == NULL)) {
8627                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8628                 }
8629                 /* now lets add any data within the MTU constraints */
8630                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8631 #ifdef INET
8632                 case AF_INET:
8633                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8634                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8635                         else
8636                                 omtu = 0;
8637                         break;
8638 #endif
8639 #ifdef INET6
8640                 case AF_INET6:
8641                         if (net->mtu > SCTP_MIN_OVERHEAD)
8642                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8643                         else
8644                                 omtu = 0;
8645                         break;
8646 #endif
8647                 default:
8648                         /* TSNH */
8649                         omtu = 0;
8650                         break;
8651                 }
8652                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8653                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8654                     (skip_data_for_this_net == 0)) ||
8655                     (cookie)) {
8656                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8657                                 if (no_data_chunks) {
8658                                         /* let only control go out */
8659                                         *reason_code = 1;
8660                                         break;
8661                                 }
8662                                 if (net->flight_size >= net->cwnd) {
8663                                         /* skip this net, no room for data */
8664                                         *reason_code = 2;
8665                                         break;
8666                                 }
8667                                 if ((chk->whoTo != NULL) &&
8668                                     (chk->whoTo != net)) {
8669                                         /* Don't send the chunk on this net */
8670                                         continue;
8671                                 }
8672
8673                                 if (asoc->sctp_cmt_on_off == 0) {
8674                                         if ((asoc->alternate) &&
8675                                             (asoc->alternate != net) &&
8676                                             (chk->whoTo == NULL)) {
8677                                                 continue;
8678                                         } else if ((net != asoc->primary_destination) &&
8679                                                     (asoc->alternate == NULL) &&
8680                                             (chk->whoTo == NULL)) {
8681                                                 continue;
8682                                         }
8683                                 }
8684                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8685                                         /*-
8686                                          * strange, we have a chunk that is
8687                                          * to big for its destination and
8688                                          * yet no fragment ok flag.
8689                                          * Something went wrong when the
8690                                          * PMTU changed...we did not mark
8691                                          * this chunk for some reason?? I
8692                                          * will fix it here by letting IP
8693                                          * fragment it for now and printing
8694                                          * a warning. This really should not
8695                                          * happen ...
8696                                          */
8697                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8698                                             chk->send_size, mtu);
8699                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8700                                 }
8701                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8702                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8703                                         struct sctp_data_chunk *dchkh;
8704
8705                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8706                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8707                                 }
8708                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8709                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8710                                         /* ok we will add this one */
8711
8712                                         /*
8713                                          * Add an AUTH chunk, if chunk
8714                                          * requires it, save the offset into
8715                                          * the chain for AUTH
8716                                          */
8717                                         if (data_auth_reqd) {
8718                                                 if (auth == NULL) {
8719                                                         outchain = sctp_add_auth_chunk(outchain,
8720                                                             &endoutchain,
8721                                                             &auth,
8722                                                             &auth_offset,
8723                                                             stcb,
8724                                                             SCTP_DATA);
8725                                                         auth_keyid = chk->auth_keyid;
8726                                                         override_ok = 0;
8727                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8728                                                 } else if (override_ok) {
8729                                                         /*
8730                                                          * use this data's
8731                                                          * keyid
8732                                                          */
8733                                                         auth_keyid = chk->auth_keyid;
8734                                                         override_ok = 0;
8735                                                 } else if (auth_keyid != chk->auth_keyid) {
8736                                                         /*
8737                                                          * different keyid,
8738                                                          * so done bundling
8739                                                          */
8740                                                         break;
8741                                                 }
8742                                         }
8743                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8744                                             chk->send_size, chk->copy_by_ref);
8745                                         if (outchain == NULL) {
8746                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8747                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8748                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8749                                                 }
8750                                                 *reason_code = 3;
8751                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8752                                                 return (ENOMEM);
8753                                         }
8754                                         /* upate our MTU size */
8755                                         /* Do clear IP_DF ? */
8756                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8757                                                 no_fragmentflg = 0;
8758                                         }
8759                                         /* unsigned subtraction of mtu */
8760                                         if (mtu > chk->send_size)
8761                                                 mtu -= chk->send_size;
8762                                         else
8763                                                 mtu = 0;
8764                                         /* unsigned subtraction of r_mtu */
8765                                         if (r_mtu > chk->send_size)
8766                                                 r_mtu -= chk->send_size;
8767                                         else
8768                                                 r_mtu = 0;
8769
8770                                         to_out += chk->send_size;
8771                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8772 #ifdef INVARIANTS
8773                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8774 #else
8775                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8776                                                     mx_mtu, to_out);
8777 #endif
8778                                         }
8779                                         chk->window_probe = 0;
8780                                         data_list[bundle_at++] = chk;
8781                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8782                                                 break;
8783                                         }
8784                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8785                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8786                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8787                                                 } else {
8788                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8789                                                 }
8790                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8791                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8792                                                         /*
8793                                                          * Count number of
8794                                                          * user msg's that
8795                                                          * were fragmented
8796                                                          * we do this by
8797                                                          * counting when we
8798                                                          * see a LAST
8799                                                          * fragment only.
8800                                                          */
8801                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8802                                         }
8803                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8804                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8805                                                         data_list[0]->window_probe = 1;
8806                                                         net->window_probe = 1;
8807                                                 }
8808                                                 break;
8809                                         }
8810                                 } else {
8811                                         /*
8812                                          * Must be sent in order of the
8813                                          * TSN's (on a network)
8814                                          */
8815                                         break;
8816                                 }
8817                         }       /* for (chunk gather loop for this net) */
8818                 }               /* if asoc.state OPEN */
8819 no_data_fill:
8820                 /* Is there something to send for this destination? */
8821                 if (outchain) {
8822                         /* We may need to start a control timer or two */
8823                         if (asconf) {
8824                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8825                                     stcb, net);
8826                                 /*
8827                                  * do NOT clear the asconf flag as it is
8828                                  * used to do appropriate source address
8829                                  * selection.
8830                                  */
8831                         }
8832                         if (cookie) {
8833                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8834                                 cookie = 0;
8835                         }
8836                         /* must start a send timer if data is being sent */
8837                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8838                                 /*
8839                                  * no timer running on this destination
8840                                  * restart it.
8841                                  */
8842                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8843                         }
8844                         if (bundle_at || hbflag) {
8845                                 /* For data/asconf and hb set time */
8846                                 if (*now_filled == 0) {
8847                                         (void)SCTP_GETTIME_TIMEVAL(now);
8848                                         *now_filled = 1;
8849                                 }
8850                                 net->last_sent_time = *now;
8851                         }
8852                         /* Now send it, if there is anything to send :> */
8853                         if ((error = sctp_lowlevel_chunk_output(inp,
8854                             stcb,
8855                             net,
8856                             (struct sockaddr *)&net->ro._l_addr,
8857                             outchain,
8858                             auth_offset,
8859                             auth,
8860                             auth_keyid,
8861                             no_fragmentflg,
8862                             bundle_at,
8863                             asconf,
8864                             inp->sctp_lport, stcb->rport,
8865                             htonl(stcb->asoc.peer_vtag),
8866                             net->port, NULL,
8867                             0, 0,
8868                             so_locked))) {
8869                                 /* error, we could not output */
8870                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8871                                 if (from_where == 0) {
8872                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8873                                 }
8874                                 if (error == ENOBUFS) {
8875                                         asoc->ifp_had_enobuf = 1;
8876                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8877                                 }
8878                                 if (error == EHOSTUNREACH) {
8879                                         /*
8880                                          * Destination went unreachable
8881                                          * during this send
8882                                          */
8883                                         sctp_move_chunks_from_net(stcb, net);
8884                                 }
8885                                 *reason_code = 6;
8886                                 /*-
8887                                  * I add this line to be paranoid. As far as
8888                                  * I can tell the continue, takes us back to
8889                                  * the top of the for, but just to make sure
8890                                  * I will reset these again here.
8891                                  */
8892                                 ctl_cnt = bundle_at = 0;
8893                                 continue;       /* This takes us back to the
8894                                                  * for() for the nets. */
8895                         } else {
8896                                 asoc->ifp_had_enobuf = 0;
8897                         }
8898                         endoutchain = NULL;
8899                         auth = NULL;
8900                         auth_offset = 0;
8901                         if (!no_out_cnt) {
8902                                 *num_out += (ctl_cnt + bundle_at);
8903                         }
8904                         if (bundle_at) {
8905                                 /* setup for a RTO measurement */
8906                                 tsns_sent = data_list[0]->rec.data.tsn;
8907                                 /* fill time if not already filled */
8908                                 if (*now_filled == 0) {
8909                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8910                                         *now_filled = 1;
8911                                         *now = asoc->time_last_sent;
8912                                 } else {
8913                                         asoc->time_last_sent = *now;
8914                                 }
8915                                 if (net->rto_needed) {
8916                                         data_list[0]->do_rtt = 1;
8917                                         net->rto_needed = 0;
8918                                 }
8919                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8920                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8921                         }
8922                         if (one_chunk) {
8923                                 break;
8924                         }
8925                 }
8926                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8927                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8928                 }
8929         }
8930         if (old_start_at == NULL) {
8931                 old_start_at = start_at;
8932                 start_at = TAILQ_FIRST(&asoc->nets);
8933                 if (old_start_at)
8934                         goto again_one_more_time;
8935         }
8936
8937         /*
8938          * At the end there should be no NON timed chunks hanging on this
8939          * queue.
8940          */
8941         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8942                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8943         }
8944         if ((*num_out == 0) && (*reason_code == 0)) {
8945                 *reason_code = 4;
8946         } else {
8947                 *reason_code = 5;
8948         }
8949         sctp_clean_up_ctl(stcb, asoc, so_locked);
8950         return (0);
8951 }
8952
8953 void
8954 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8955 {
8956         /*-
8957          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8958          * the control chunk queue.
8959          */
8960         struct sctp_chunkhdr *hdr;
8961         struct sctp_tmit_chunk *chk;
8962         struct mbuf *mat, *last_mbuf;
8963         uint32_t chunk_length;
8964         uint16_t padding_length;
8965
8966         SCTP_TCB_LOCK_ASSERT(stcb);
8967         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8968         if (op_err == NULL) {
8969                 return;
8970         }
8971         last_mbuf = NULL;
8972         chunk_length = 0;
8973         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8974                 chunk_length += SCTP_BUF_LEN(mat);
8975                 if (SCTP_BUF_NEXT(mat) == NULL) {
8976                         last_mbuf = mat;
8977                 }
8978         }
8979         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8980                 sctp_m_freem(op_err);
8981                 return;
8982         }
8983         padding_length = chunk_length % 4;
8984         if (padding_length != 0) {
8985                 padding_length = 4 - padding_length;
8986         }
8987         if (padding_length != 0) {
8988                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8989                         sctp_m_freem(op_err);
8990                         return;
8991                 }
8992         }
8993         sctp_alloc_a_chunk(stcb, chk);
8994         if (chk == NULL) {
8995                 /* no memory */
8996                 sctp_m_freem(op_err);
8997                 return;
8998         }
8999         chk->copy_by_ref = 0;
9000         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
9001         chk->rec.chunk_id.can_take_data = 0;
9002         chk->flags = 0;
9003         chk->send_size = (uint16_t)chunk_length;
9004         chk->sent = SCTP_DATAGRAM_UNSENT;
9005         chk->snd_count = 0;
9006         chk->asoc = &stcb->asoc;
9007         chk->data = op_err;
9008         chk->whoTo = NULL;
9009         hdr = mtod(op_err, struct sctp_chunkhdr *);
9010         hdr->chunk_type = SCTP_OPERATION_ERROR;
9011         hdr->chunk_flags = 0;
9012         hdr->chunk_length = htons(chk->send_size);
9013         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9014         chk->asoc->ctrl_queue_cnt++;
9015 }
9016
9017 int
9018 sctp_send_cookie_echo(struct mbuf *m,
9019     int offset, int limit,
9020     struct sctp_tcb *stcb,
9021     struct sctp_nets *net)
9022 {
9023         /*-
9024          * pull out the cookie and put it at the front of the control chunk
9025          * queue.
9026          */
9027         int at;
9028         struct mbuf *cookie;
9029         struct sctp_paramhdr param, *phdr;
9030         struct sctp_chunkhdr *hdr;
9031         struct sctp_tmit_chunk *chk;
9032         uint16_t ptype, plen;
9033
9034         SCTP_TCB_LOCK_ASSERT(stcb);
9035         /* First find the cookie in the param area */
9036         cookie = NULL;
9037         at = offset + sizeof(struct sctp_init_chunk);
9038         for (;;) {
9039                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9040                 if (phdr == NULL) {
9041                         return (-3);
9042                 }
9043                 ptype = ntohs(phdr->param_type);
9044                 plen = ntohs(phdr->param_length);
9045                 if (plen < sizeof(struct sctp_paramhdr)) {
9046                         return (-6);
9047                 }
9048                 if (ptype == SCTP_STATE_COOKIE) {
9049                         int pad;
9050
9051                         /* found the cookie */
9052                         if (at + plen > limit) {
9053                                 return (-7);
9054                         }
9055                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9056                         if (cookie == NULL) {
9057                                 /* No memory */
9058                                 return (-2);
9059                         }
9060                         if ((pad = (plen % 4)) > 0) {
9061                                 pad = 4 - pad;
9062                         }
9063                         if (pad > 0) {
9064                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
9065                                         return (-8);
9066                                 }
9067                         }
9068 #ifdef SCTP_MBUF_LOGGING
9069                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9070                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9071                         }
9072 #endif
9073                         break;
9074                 }
9075                 at += SCTP_SIZE32(plen);
9076         }
9077         /* ok, we got the cookie lets change it into a cookie echo chunk */
9078         /* first the change from param to cookie */
9079         hdr = mtod(cookie, struct sctp_chunkhdr *);
9080         hdr->chunk_type = SCTP_COOKIE_ECHO;
9081         hdr->chunk_flags = 0;
9082         /* get the chunk stuff now and place it in the FRONT of the queue */
9083         sctp_alloc_a_chunk(stcb, chk);
9084         if (chk == NULL) {
9085                 /* no memory */
9086                 sctp_m_freem(cookie);
9087                 return (-5);
9088         }
9089         chk->copy_by_ref = 0;
9090         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9091         chk->rec.chunk_id.can_take_data = 0;
9092         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9093         chk->send_size = SCTP_SIZE32(plen);
9094         chk->sent = SCTP_DATAGRAM_UNSENT;
9095         chk->snd_count = 0;
9096         chk->asoc = &stcb->asoc;
9097         chk->data = cookie;
9098         chk->whoTo = net;
9099         atomic_add_int(&chk->whoTo->ref_count, 1);
9100         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9101         chk->asoc->ctrl_queue_cnt++;
9102         return (0);
9103 }
9104
9105 void
9106 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9107     struct mbuf *m,
9108     int offset,
9109     int chk_length,
9110     struct sctp_nets *net)
9111 {
9112         /*
9113          * take a HB request and make it into a HB ack and send it.
9114          */
9115         struct mbuf *outchain;
9116         struct sctp_chunkhdr *chdr;
9117         struct sctp_tmit_chunk *chk;
9118
9119         if (net == NULL)
9120                 /* must have a net pointer */
9121                 return;
9122
9123         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9124         if (outchain == NULL) {
9125                 /* gak out of memory */
9126                 return;
9127         }
9128 #ifdef SCTP_MBUF_LOGGING
9129         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9130                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9131         }
9132 #endif
9133         chdr = mtod(outchain, struct sctp_chunkhdr *);
9134         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9135         chdr->chunk_flags = 0;
9136         if (chk_length % 4 != 0) {
9137                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9138         }
9139         sctp_alloc_a_chunk(stcb, chk);
9140         if (chk == NULL) {
9141                 /* no memory */
9142                 sctp_m_freem(outchain);
9143                 return;
9144         }
9145         chk->copy_by_ref = 0;
9146         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9147         chk->rec.chunk_id.can_take_data = 1;
9148         chk->flags = 0;
9149         chk->send_size = chk_length;
9150         chk->sent = SCTP_DATAGRAM_UNSENT;
9151         chk->snd_count = 0;
9152         chk->asoc = &stcb->asoc;
9153         chk->data = outchain;
9154         chk->whoTo = net;
9155         atomic_add_int(&chk->whoTo->ref_count, 1);
9156         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9157         chk->asoc->ctrl_queue_cnt++;
9158 }
9159
9160 void
9161 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9162 {
9163         /* formulate and queue a cookie-ack back to sender */
9164         struct mbuf *cookie_ack;
9165         struct sctp_chunkhdr *hdr;
9166         struct sctp_tmit_chunk *chk;
9167
9168         SCTP_TCB_LOCK_ASSERT(stcb);
9169
9170         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9171         if (cookie_ack == NULL) {
9172                 /* no mbuf's */
9173                 return;
9174         }
9175         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9176         sctp_alloc_a_chunk(stcb, chk);
9177         if (chk == NULL) {
9178                 /* no memory */
9179                 sctp_m_freem(cookie_ack);
9180                 return;
9181         }
9182         chk->copy_by_ref = 0;
9183         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9184         chk->rec.chunk_id.can_take_data = 1;
9185         chk->flags = 0;
9186         chk->send_size = sizeof(struct sctp_chunkhdr);
9187         chk->sent = SCTP_DATAGRAM_UNSENT;
9188         chk->snd_count = 0;
9189         chk->asoc = &stcb->asoc;
9190         chk->data = cookie_ack;
9191         if (chk->asoc->last_control_chunk_from != NULL) {
9192                 chk->whoTo = chk->asoc->last_control_chunk_from;
9193                 atomic_add_int(&chk->whoTo->ref_count, 1);
9194         } else {
9195                 chk->whoTo = NULL;
9196         }
9197         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9198         hdr->chunk_type = SCTP_COOKIE_ACK;
9199         hdr->chunk_flags = 0;
9200         hdr->chunk_length = htons(chk->send_size);
9201         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9202         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9203         chk->asoc->ctrl_queue_cnt++;
9204         return;
9205 }
9206
9207
9208 void
9209 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9210 {
9211         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9212         struct mbuf *m_shutdown_ack;
9213         struct sctp_shutdown_ack_chunk *ack_cp;
9214         struct sctp_tmit_chunk *chk;
9215
9216         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9217         if (m_shutdown_ack == NULL) {
9218                 /* no mbuf's */
9219                 return;
9220         }
9221         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9222         sctp_alloc_a_chunk(stcb, chk);
9223         if (chk == NULL) {
9224                 /* no memory */
9225                 sctp_m_freem(m_shutdown_ack);
9226                 return;
9227         }
9228         chk->copy_by_ref = 0;
9229         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9230         chk->rec.chunk_id.can_take_data = 1;
9231         chk->flags = 0;
9232         chk->send_size = sizeof(struct sctp_chunkhdr);
9233         chk->sent = SCTP_DATAGRAM_UNSENT;
9234         chk->snd_count = 0;
9235         chk->asoc = &stcb->asoc;
9236         chk->data = m_shutdown_ack;
9237         chk->whoTo = net;
9238         if (chk->whoTo) {
9239                 atomic_add_int(&chk->whoTo->ref_count, 1);
9240         }
9241         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9242         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9243         ack_cp->ch.chunk_flags = 0;
9244         ack_cp->ch.chunk_length = htons(chk->send_size);
9245         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9246         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9247         chk->asoc->ctrl_queue_cnt++;
9248         return;
9249 }
9250
9251 void
9252 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9253 {
9254         /* formulate and queue a SHUTDOWN to the sender */
9255         struct mbuf *m_shutdown;
9256         struct sctp_shutdown_chunk *shutdown_cp;
9257         struct sctp_tmit_chunk *chk;
9258
9259         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9260                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9261                         /* We already have a SHUTDOWN queued. Reuse it. */
9262                         if (chk->whoTo) {
9263                                 sctp_free_remote_addr(chk->whoTo);
9264                                 chk->whoTo = NULL;
9265                         }
9266                         break;
9267                 }
9268         }
9269         if (chk == NULL) {
9270                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9271                 if (m_shutdown == NULL) {
9272                         /* no mbuf's */
9273                         return;
9274                 }
9275                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9276                 sctp_alloc_a_chunk(stcb, chk);
9277                 if (chk == NULL) {
9278                         /* no memory */
9279                         sctp_m_freem(m_shutdown);
9280                         return;
9281                 }
9282                 chk->copy_by_ref = 0;
9283                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9284                 chk->rec.chunk_id.can_take_data = 1;
9285                 chk->flags = 0;
9286                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9287                 chk->sent = SCTP_DATAGRAM_UNSENT;
9288                 chk->snd_count = 0;
9289                 chk->asoc = &stcb->asoc;
9290                 chk->data = m_shutdown;
9291                 chk->whoTo = net;
9292                 if (chk->whoTo) {
9293                         atomic_add_int(&chk->whoTo->ref_count, 1);
9294                 }
9295                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9296                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9297                 shutdown_cp->ch.chunk_flags = 0;
9298                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9299                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9300                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9301                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9302                 chk->asoc->ctrl_queue_cnt++;
9303         } else {
9304                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9305                 chk->whoTo = net;
9306                 if (chk->whoTo) {
9307                         atomic_add_int(&chk->whoTo->ref_count, 1);
9308                 }
9309                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9310                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9311                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9312         }
9313         return;
9314 }
9315
9316 void
9317 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9318 {
9319         /*
9320          * formulate and queue an ASCONF to the peer. ASCONF parameters
9321          * should be queued on the assoc queue.
9322          */
9323         struct sctp_tmit_chunk *chk;
9324         struct mbuf *m_asconf;
9325         int len;
9326
9327         SCTP_TCB_LOCK_ASSERT(stcb);
9328
9329         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9330             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9331                 /* can't send a new one if there is one in flight already */
9332                 return;
9333         }
9334
9335         /* compose an ASCONF chunk, maximum length is PMTU */
9336         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9337         if (m_asconf == NULL) {
9338                 return;
9339         }
9340
9341         sctp_alloc_a_chunk(stcb, chk);
9342         if (chk == NULL) {
9343                 /* no memory */
9344                 sctp_m_freem(m_asconf);
9345                 return;
9346         }
9347
9348         chk->copy_by_ref = 0;
9349         chk->rec.chunk_id.id = SCTP_ASCONF;
9350         chk->rec.chunk_id.can_take_data = 0;
9351         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9352         chk->data = m_asconf;
9353         chk->send_size = len;
9354         chk->sent = SCTP_DATAGRAM_UNSENT;
9355         chk->snd_count = 0;
9356         chk->asoc = &stcb->asoc;
9357         chk->whoTo = net;
9358         if (chk->whoTo) {
9359                 atomic_add_int(&chk->whoTo->ref_count, 1);
9360         }
9361         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9362         chk->asoc->ctrl_queue_cnt++;
9363         return;
9364 }
9365
9366 void
9367 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9368 {
9369         /*
9370          * formulate and queue a asconf-ack back to sender. the asconf-ack
9371          * must be stored in the tcb.
9372          */
9373         struct sctp_tmit_chunk *chk;
9374         struct sctp_asconf_ack *ack, *latest_ack;
9375         struct mbuf *m_ack;
9376         struct sctp_nets *net = NULL;
9377
9378         SCTP_TCB_LOCK_ASSERT(stcb);
9379         /* Get the latest ASCONF-ACK */
9380         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9381         if (latest_ack == NULL) {
9382                 return;
9383         }
9384         if (latest_ack->last_sent_to != NULL &&
9385             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9386                 /* we're doing a retransmission */
9387                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9388                 if (net == NULL) {
9389                         /* no alternate */
9390                         if (stcb->asoc.last_control_chunk_from == NULL) {
9391                                 if (stcb->asoc.alternate) {
9392                                         net = stcb->asoc.alternate;
9393                                 } else {
9394                                         net = stcb->asoc.primary_destination;
9395                                 }
9396                         } else {
9397                                 net = stcb->asoc.last_control_chunk_from;
9398                         }
9399                 }
9400         } else {
9401                 /* normal case */
9402                 if (stcb->asoc.last_control_chunk_from == NULL) {
9403                         if (stcb->asoc.alternate) {
9404                                 net = stcb->asoc.alternate;
9405                         } else {
9406                                 net = stcb->asoc.primary_destination;
9407                         }
9408                 } else {
9409                         net = stcb->asoc.last_control_chunk_from;
9410                 }
9411         }
9412         latest_ack->last_sent_to = net;
9413
9414         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9415                 if (ack->data == NULL) {
9416                         continue;
9417                 }
9418
9419                 /* copy the asconf_ack */
9420                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9421                 if (m_ack == NULL) {
9422                         /* couldn't copy it */
9423                         return;
9424                 }
9425 #ifdef SCTP_MBUF_LOGGING
9426                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9427                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9428                 }
9429 #endif
9430
9431                 sctp_alloc_a_chunk(stcb, chk);
9432                 if (chk == NULL) {
9433                         /* no memory */
9434                         if (m_ack)
9435                                 sctp_m_freem(m_ack);
9436                         return;
9437                 }
9438                 chk->copy_by_ref = 0;
9439                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9440                 chk->rec.chunk_id.can_take_data = 1;
9441                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9442                 chk->whoTo = net;
9443                 if (chk->whoTo) {
9444                         atomic_add_int(&chk->whoTo->ref_count, 1);
9445                 }
9446                 chk->data = m_ack;
9447                 chk->send_size = ack->len;
9448                 chk->sent = SCTP_DATAGRAM_UNSENT;
9449                 chk->snd_count = 0;
9450                 chk->asoc = &stcb->asoc;
9451
9452                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9453                 chk->asoc->ctrl_queue_cnt++;
9454         }
9455         return;
9456 }
9457
9458
9459 static int
9460 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9461     struct sctp_tcb *stcb,
9462     struct sctp_association *asoc,
9463     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9464 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9465     SCTP_UNUSED
9466 #endif
9467 )
9468 {
9469         /*-
9470          * send out one MTU of retransmission. If fast_retransmit is
9471          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9472          * rwnd. For a Cookie or Asconf in the control chunk queue we
9473          * retransmit them by themselves.
9474          *
9475          * For data chunks we will pick out the lowest TSN's in the sent_queue
9476          * marked for resend and bundle them all together (up to a MTU of
9477          * destination). The address to send to should have been
9478          * selected/changed where the retransmission was marked (i.e. in FR
9479          * or t3-timeout routines).
9480          */
9481         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9482         struct sctp_tmit_chunk *chk, *fwd;
9483         struct mbuf *m, *endofchain;
9484         struct sctp_nets *net = NULL;
9485         uint32_t tsns_sent = 0;
9486         int no_fragmentflg, bundle_at, cnt_thru;
9487         unsigned int mtu;
9488         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9489         struct sctp_auth_chunk *auth = NULL;
9490         uint32_t auth_offset = 0;
9491         uint16_t auth_keyid;
9492         int override_ok = 1;
9493         int data_auth_reqd = 0;
9494         uint32_t dmtu = 0;
9495
9496         SCTP_TCB_LOCK_ASSERT(stcb);
9497         tmr_started = ctl_cnt = bundle_at = error = 0;
9498         no_fragmentflg = 1;
9499         fwd_tsn = 0;
9500         *cnt_out = 0;
9501         fwd = NULL;
9502         endofchain = m = NULL;
9503         auth_keyid = stcb->asoc.authinfo.active_keyid;
9504 #ifdef SCTP_AUDITING_ENABLED
9505         sctp_audit_log(0xC3, 1);
9506 #endif
9507         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9508             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9509                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9510                     asoc->sent_queue_retran_cnt);
9511                 asoc->sent_queue_cnt = 0;
9512                 asoc->sent_queue_cnt_removeable = 0;
9513                 /* send back 0/0 so we enter normal transmission */
9514                 *cnt_out = 0;
9515                 return (0);
9516         }
9517         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9518                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9519                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9520                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9521                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9522                                 continue;
9523                         }
9524                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9525                                 if (chk != asoc->str_reset) {
9526                                         /*
9527                                          * not eligible for retran if its
9528                                          * not ours
9529                                          */
9530                                         continue;
9531                                 }
9532                         }
9533                         ctl_cnt++;
9534                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9535                                 fwd_tsn = 1;
9536                         }
9537                         /*
9538                          * Add an AUTH chunk, if chunk requires it save the
9539                          * offset into the chain for AUTH
9540                          */
9541                         if ((auth == NULL) &&
9542                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9543                             stcb->asoc.peer_auth_chunks))) {
9544                                 m = sctp_add_auth_chunk(m, &endofchain,
9545                                     &auth, &auth_offset,
9546                                     stcb,
9547                                     chk->rec.chunk_id.id);
9548                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9549                         }
9550                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9551                         break;
9552                 }
9553         }
9554         one_chunk = 0;
9555         cnt_thru = 0;
9556         /* do we have control chunks to retransmit? */
9557         if (m != NULL) {
9558                 /* Start a timer no matter if we succeed or fail */
9559                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9560                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9561                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9562                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9563                 chk->snd_count++;       /* update our count */
9564                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9565                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9566                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9567                     no_fragmentflg, 0, 0,
9568                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9569                     chk->whoTo->port, NULL,
9570                     0, 0,
9571                     so_locked))) {
9572                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9573                         if (error == ENOBUFS) {
9574                                 asoc->ifp_had_enobuf = 1;
9575                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9576                         }
9577                         return (error);
9578                 } else {
9579                         asoc->ifp_had_enobuf = 0;
9580                 }
9581                 endofchain = NULL;
9582                 auth = NULL;
9583                 auth_offset = 0;
9584                 /*
9585                  * We don't want to mark the net->sent time here since this
9586                  * we use this for HB and retrans cannot measure RTT
9587                  */
9588                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9589                 *cnt_out += 1;
9590                 chk->sent = SCTP_DATAGRAM_SENT;
9591                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9592                 if (fwd_tsn == 0) {
9593                         return (0);
9594                 } else {
9595                         /* Clean up the fwd-tsn list */
9596                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9597                         return (0);
9598                 }
9599         }
9600         /*
9601          * Ok, it is just data retransmission we need to do or that and a
9602          * fwd-tsn with it all.
9603          */
9604         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9605                 return (SCTP_RETRAN_DONE);
9606         }
9607         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9608             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9609                 /* not yet open, resend the cookie and that is it */
9610                 return (1);
9611         }
9612 #ifdef SCTP_AUDITING_ENABLED
9613         sctp_auditing(20, inp, stcb, NULL);
9614 #endif
9615         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9616         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9617                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9618                         /* No, not sent to this net or not ready for rtx */
9619                         continue;
9620                 }
9621                 if (chk->data == NULL) {
9622                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9623                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9624                         continue;
9625                 }
9626                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9627                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9628                         struct mbuf *op_err;
9629                         char msg[SCTP_DIAG_INFO_LEN];
9630
9631                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9632                             chk->rec.data.tsn, chk->snd_count);
9633                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9634                             msg);
9635                         atomic_add_int(&stcb->asoc.refcnt, 1);
9636                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9637                             so_locked);
9638                         SCTP_TCB_LOCK(stcb);
9639                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9640                         return (SCTP_RETRAN_EXIT);
9641                 }
9642                 /* pick up the net */
9643                 net = chk->whoTo;
9644                 switch (net->ro._l_addr.sa.sa_family) {
9645 #ifdef INET
9646                 case AF_INET:
9647                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9648                         break;
9649 #endif
9650 #ifdef INET6
9651                 case AF_INET6:
9652                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9653                         break;
9654 #endif
9655                 default:
9656                         /* TSNH */
9657                         mtu = net->mtu;
9658                         break;
9659                 }
9660
9661                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9662                         /* No room in peers rwnd */
9663                         uint32_t tsn;
9664
9665                         tsn = asoc->last_acked_seq + 1;
9666                         if (tsn == chk->rec.data.tsn) {
9667                                 /*
9668                                  * we make a special exception for this
9669                                  * case. The peer has no rwnd but is missing
9670                                  * the lowest chunk.. which is probably what
9671                                  * is holding up the rwnd.
9672                                  */
9673                                 goto one_chunk_around;
9674                         }
9675                         return (1);
9676                 }
9677 one_chunk_around:
9678                 if (asoc->peers_rwnd < mtu) {
9679                         one_chunk = 1;
9680                         if ((asoc->peers_rwnd == 0) &&
9681                             (asoc->total_flight == 0)) {
9682                                 chk->window_probe = 1;
9683                                 chk->whoTo->window_probe = 1;
9684                         }
9685                 }
9686 #ifdef SCTP_AUDITING_ENABLED
9687                 sctp_audit_log(0xC3, 2);
9688 #endif
9689                 bundle_at = 0;
9690                 m = NULL;
9691                 net->fast_retran_ip = 0;
9692                 if (chk->rec.data.doing_fast_retransmit == 0) {
9693                         /*
9694                          * if no FR in progress skip destination that have
9695                          * flight_size > cwnd.
9696                          */
9697                         if (net->flight_size >= net->cwnd) {
9698                                 continue;
9699                         }
9700                 } else {
9701                         /*
9702                          * Mark the destination net to have FR recovery
9703                          * limits put on it.
9704                          */
9705                         *fr_done = 1;
9706                         net->fast_retran_ip = 1;
9707                 }
9708
9709                 /*
9710                  * if no AUTH is yet included and this chunk requires it,
9711                  * make sure to account for it.  We don't apply the size
9712                  * until the AUTH chunk is actually added below in case
9713                  * there is no room for this chunk.
9714                  */
9715                 if (data_auth_reqd && (auth == NULL)) {
9716                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9717                 } else
9718                         dmtu = 0;
9719
9720                 if ((chk->send_size <= (mtu - dmtu)) ||
9721                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9722                         /* ok we will add this one */
9723                         if (data_auth_reqd) {
9724                                 if (auth == NULL) {
9725                                         m = sctp_add_auth_chunk(m,
9726                                             &endofchain,
9727                                             &auth,
9728                                             &auth_offset,
9729                                             stcb,
9730                                             SCTP_DATA);
9731                                         auth_keyid = chk->auth_keyid;
9732                                         override_ok = 0;
9733                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9734                                 } else if (override_ok) {
9735                                         auth_keyid = chk->auth_keyid;
9736                                         override_ok = 0;
9737                                 } else if (chk->auth_keyid != auth_keyid) {
9738                                         /* different keyid, so done bundling */
9739                                         break;
9740                                 }
9741                         }
9742                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9743                         if (m == NULL) {
9744                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9745                                 return (ENOMEM);
9746                         }
9747                         /* Do clear IP_DF ? */
9748                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9749                                 no_fragmentflg = 0;
9750                         }
9751                         /* upate our MTU size */
9752                         if (mtu > (chk->send_size + dmtu))
9753                                 mtu -= (chk->send_size + dmtu);
9754                         else
9755                                 mtu = 0;
9756                         data_list[bundle_at++] = chk;
9757                         if (one_chunk && (asoc->total_flight <= 0)) {
9758                                 SCTP_STAT_INCR(sctps_windowprobed);
9759                         }
9760                 }
9761                 if (one_chunk == 0) {
9762                         /*
9763                          * now are there anymore forward from chk to pick
9764                          * up?
9765                          */
9766                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9767                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9768                                         /* Nope, not for retran */
9769                                         continue;
9770                                 }
9771                                 if (fwd->whoTo != net) {
9772                                         /* Nope, not the net in question */
9773                                         continue;
9774                                 }
9775                                 if (data_auth_reqd && (auth == NULL)) {
9776                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9777                                 } else
9778                                         dmtu = 0;
9779                                 if (fwd->send_size <= (mtu - dmtu)) {
9780                                         if (data_auth_reqd) {
9781                                                 if (auth == NULL) {
9782                                                         m = sctp_add_auth_chunk(m,
9783                                                             &endofchain,
9784                                                             &auth,
9785                                                             &auth_offset,
9786                                                             stcb,
9787                                                             SCTP_DATA);
9788                                                         auth_keyid = fwd->auth_keyid;
9789                                                         override_ok = 0;
9790                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9791                                                 } else if (override_ok) {
9792                                                         auth_keyid = fwd->auth_keyid;
9793                                                         override_ok = 0;
9794                                                 } else if (fwd->auth_keyid != auth_keyid) {
9795                                                         /*
9796                                                          * different keyid,
9797                                                          * so done bundling
9798                                                          */
9799                                                         break;
9800                                                 }
9801                                         }
9802                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9803                                         if (m == NULL) {
9804                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9805                                                 return (ENOMEM);
9806                                         }
9807                                         /* Do clear IP_DF ? */
9808                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9809                                                 no_fragmentflg = 0;
9810                                         }
9811                                         /* upate our MTU size */
9812                                         if (mtu > (fwd->send_size + dmtu))
9813                                                 mtu -= (fwd->send_size + dmtu);
9814                                         else
9815                                                 mtu = 0;
9816                                         data_list[bundle_at++] = fwd;
9817                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9818                                                 break;
9819                                         }
9820                                 } else {
9821                                         /* can't fit so we are done */
9822                                         break;
9823                                 }
9824                         }
9825                 }
9826                 /* Is there something to send for this destination? */
9827                 if (m) {
9828                         /*
9829                          * No matter if we fail/or succeed we should start a
9830                          * timer. A failure is like a lost IP packet :-)
9831                          */
9832                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9833                                 /*
9834                                  * no timer running on this destination
9835                                  * restart it.
9836                                  */
9837                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9838                                 tmr_started = 1;
9839                         }
9840                         /* Now lets send it, if there is anything to send :> */
9841                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9842                             (struct sockaddr *)&net->ro._l_addr, m,
9843                             auth_offset, auth, auth_keyid,
9844                             no_fragmentflg, 0, 0,
9845                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9846                             net->port, NULL,
9847                             0, 0,
9848                             so_locked))) {
9849                                 /* error, we could not output */
9850                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9851                                 if (error == ENOBUFS) {
9852                                         asoc->ifp_had_enobuf = 1;
9853                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9854                                 }
9855                                 return (error);
9856                         } else {
9857                                 asoc->ifp_had_enobuf = 0;
9858                         }
9859                         endofchain = NULL;
9860                         auth = NULL;
9861                         auth_offset = 0;
9862                         /* For HB's */
9863                         /*
9864                          * We don't want to mark the net->sent time here
9865                          * since this we use this for HB and retrans cannot
9866                          * measure RTT
9867                          */
9868                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9869
9870                         /* For auto-close */
9871                         cnt_thru++;
9872                         if (*now_filled == 0) {
9873                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9874                                 *now = asoc->time_last_sent;
9875                                 *now_filled = 1;
9876                         } else {
9877                                 asoc->time_last_sent = *now;
9878                         }
9879                         *cnt_out += bundle_at;
9880 #ifdef SCTP_AUDITING_ENABLED
9881                         sctp_audit_log(0xC4, bundle_at);
9882 #endif
9883                         if (bundle_at) {
9884                                 tsns_sent = data_list[0]->rec.data.tsn;
9885                         }
9886                         for (i = 0; i < bundle_at; i++) {
9887                                 SCTP_STAT_INCR(sctps_sendretransdata);
9888                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9889                                 /*
9890                                  * When we have a revoked data, and we
9891                                  * retransmit it, then we clear the revoked
9892                                  * flag since this flag dictates if we
9893                                  * subtracted from the fs
9894                                  */
9895                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9896                                         /* Deflate the cwnd */
9897                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9898                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9899                                 }
9900                                 data_list[i]->snd_count++;
9901                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9902                                 /* record the time */
9903                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9904                                 if (data_list[i]->book_size_scale) {
9905                                         /*
9906                                          * need to double the book size on
9907                                          * this one
9908                                          */
9909                                         data_list[i]->book_size_scale = 0;
9910                                         /*
9911                                          * Since we double the booksize, we
9912                                          * must also double the output queue
9913                                          * size, since this get shrunk when
9914                                          * we free by this amount.
9915                                          */
9916                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9917                                         data_list[i]->book_size *= 2;
9918
9919
9920                                 } else {
9921                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9922                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9923                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9924                                         }
9925                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9926                                             (uint32_t)(data_list[i]->send_size +
9927                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9928                                 }
9929                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9930                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9931                                             data_list[i]->whoTo->flight_size,
9932                                             data_list[i]->book_size,
9933                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9934                                             data_list[i]->rec.data.tsn);
9935                                 }
9936                                 sctp_flight_size_increase(data_list[i]);
9937                                 sctp_total_flight_increase(stcb, data_list[i]);
9938                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9939                                         /* SWS sender side engages */
9940                                         asoc->peers_rwnd = 0;
9941                                 }
9942                                 if ((i == 0) &&
9943                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9944                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9945                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9946                                             (tmr_started == 0)) {
9947                                                 /*-
9948                                                  * ok we just fast-retrans'd
9949                                                  * the lowest TSN, i.e the
9950                                                  * first on the list. In
9951                                                  * this case we want to give
9952                                                  * some more time to get a
9953                                                  * SACK back without a
9954                                                  * t3-expiring.
9955                                                  */
9956                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9957                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9958                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9959                                         }
9960                                 }
9961                         }
9962                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9963                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9964                         }
9965 #ifdef SCTP_AUDITING_ENABLED
9966                         sctp_auditing(21, inp, stcb, NULL);
9967 #endif
9968                 } else {
9969                         /* None will fit */
9970                         return (1);
9971                 }
9972                 if (asoc->sent_queue_retran_cnt <= 0) {
9973                         /* all done we have no more to retran */
9974                         asoc->sent_queue_retran_cnt = 0;
9975                         break;
9976                 }
9977                 if (one_chunk) {
9978                         /* No more room in rwnd */
9979                         return (1);
9980                 }
9981                 /* stop the for loop here. we sent out a packet */
9982                 break;
9983         }
9984         return (0);
9985 }
9986
9987 static void
9988 sctp_timer_validation(struct sctp_inpcb *inp,
9989     struct sctp_tcb *stcb,
9990     struct sctp_association *asoc)
9991 {
9992         struct sctp_nets *net;
9993
9994         /* Validate that a timer is running somewhere */
9995         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9996                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9997                         /* Here is a timer */
9998                         return;
9999                 }
10000         }
10001         SCTP_TCB_LOCK_ASSERT(stcb);
10002         /* Gak, we did not have a timer somewhere */
10003         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
10004         if (asoc->alternate) {
10005                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
10006         } else {
10007                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
10008         }
10009         return;
10010 }
10011
10012 void
10013 sctp_chunk_output(struct sctp_inpcb *inp,
10014     struct sctp_tcb *stcb,
10015     int from_where,
10016     int so_locked
10017 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10018     SCTP_UNUSED
10019 #endif
10020 )
10021 {
10022         /*-
10023          * Ok this is the generic chunk service queue. we must do the
10024          * following:
10025          * - See if there are retransmits pending, if so we must
10026          *   do these first.
10027          * - Service the stream queue that is next, moving any
10028          *   message (note I must get a complete message i.e.
10029          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10030          *   TSN's
10031          * - Check to see if the cwnd/rwnd allows any output, if so we
10032          *   go ahead and fomulate and send the low level chunks. Making sure
10033          *   to combine any control in the control chunk queue also.
10034          */
10035         struct sctp_association *asoc;
10036         struct sctp_nets *net;
10037         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10038         unsigned int burst_cnt = 0;
10039         struct timeval now;
10040         int now_filled = 0;
10041         int nagle_on;
10042         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10043         int un_sent = 0;
10044         int fr_done;
10045         unsigned int tot_frs = 0;
10046
10047         asoc = &stcb->asoc;
10048 do_it_again:
10049         /* The Nagle algorithm is only applied when handling a send call. */
10050         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10051                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10052                         nagle_on = 0;
10053                 } else {
10054                         nagle_on = 1;
10055                 }
10056         } else {
10057                 nagle_on = 0;
10058         }
10059         SCTP_TCB_LOCK_ASSERT(stcb);
10060
10061         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10062
10063         if ((un_sent <= 0) &&
10064             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10065             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10066             (asoc->sent_queue_retran_cnt == 0) &&
10067             (asoc->trigger_reset == 0)) {
10068                 /* Nothing to do unless there is something to be sent left */
10069                 return;
10070         }
10071         /*
10072          * Do we have something to send, data or control AND a sack timer
10073          * running, if so piggy-back the sack.
10074          */
10075         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10076                 sctp_send_sack(stcb, so_locked);
10077                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10078         }
10079         while (asoc->sent_queue_retran_cnt) {
10080                 /*-
10081                  * Ok, it is retransmission time only, we send out only ONE
10082                  * packet with a single call off to the retran code.
10083                  */
10084                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10085                         /*-
10086                          * Special hook for handling cookiess discarded
10087                          * by peer that carried data. Send cookie-ack only
10088                          * and then the next call with get the retran's.
10089                          */
10090                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10091                             from_where,
10092                             &now, &now_filled, frag_point, so_locked);
10093                         return;
10094                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10095                         /* if its not from a HB then do it */
10096                         fr_done = 0;
10097                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10098                         if (fr_done) {
10099                                 tot_frs++;
10100                         }
10101                 } else {
10102                         /*
10103                          * its from any other place, we don't allow retran
10104                          * output (only control)
10105                          */
10106                         ret = 1;
10107                 }
10108                 if (ret > 0) {
10109                         /* Can't send anymore */
10110                         /*-
10111                          * now lets push out control by calling med-level
10112                          * output once. this assures that we WILL send HB's
10113                          * if queued too.
10114                          */
10115                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10116                             from_where,
10117                             &now, &now_filled, frag_point, so_locked);
10118 #ifdef SCTP_AUDITING_ENABLED
10119                         sctp_auditing(8, inp, stcb, NULL);
10120 #endif
10121                         sctp_timer_validation(inp, stcb, asoc);
10122                         return;
10123                 }
10124                 if (ret < 0) {
10125                         /*-
10126                          * The count was off.. retran is not happening so do
10127                          * the normal retransmission.
10128                          */
10129 #ifdef SCTP_AUDITING_ENABLED
10130                         sctp_auditing(9, inp, stcb, NULL);
10131 #endif
10132                         if (ret == SCTP_RETRAN_EXIT) {
10133                                 return;
10134                         }
10135                         break;
10136                 }
10137                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10138                         /* Only one transmission allowed out of a timeout */
10139 #ifdef SCTP_AUDITING_ENABLED
10140                         sctp_auditing(10, inp, stcb, NULL);
10141 #endif
10142                         /* Push out any control */
10143                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10144                             &now, &now_filled, frag_point, so_locked);
10145                         return;
10146                 }
10147                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10148                         /* Hit FR burst limit */
10149                         return;
10150                 }
10151                 if ((num_out == 0) && (ret == 0)) {
10152                         /* No more retrans to send */
10153                         break;
10154                 }
10155         }
10156 #ifdef SCTP_AUDITING_ENABLED
10157         sctp_auditing(12, inp, stcb, NULL);
10158 #endif
10159         /* Check for bad destinations, if they exist move chunks around. */
10160         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10161                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10162                         /*-
10163                          * if possible move things off of this address we
10164                          * still may send below due to the dormant state but
10165                          * we try to find an alternate address to send to
10166                          * and if we have one we move all queued data on the
10167                          * out wheel to this alternate address.
10168                          */
10169                         if (net->ref_count > 1)
10170                                 sctp_move_chunks_from_net(stcb, net);
10171                 } else {
10172                         /*-
10173                          * if ((asoc->sat_network) || (net->addr_is_local))
10174                          * { burst_limit = asoc->max_burst *
10175                          * SCTP_SAT_NETWORK_BURST_INCR; }
10176                          */
10177                         if (asoc->max_burst > 0) {
10178                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10179                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10180                                                 /*
10181                                                  * JRS - Use the congestion
10182                                                  * control given in the
10183                                                  * congestion control module
10184                                                  */
10185                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10186                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10187                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10188                                                 }
10189                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10190                                         }
10191                                         net->fast_retran_ip = 0;
10192                                 } else {
10193                                         if (net->flight_size == 0) {
10194                                                 /*
10195                                                  * Should be decaying the
10196                                                  * cwnd here
10197                                                  */
10198                                                 ;
10199                                         }
10200                                 }
10201                         }
10202                 }
10203
10204         }
10205         burst_cnt = 0;
10206         do {
10207                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10208                     &reason_code, 0, from_where,
10209                     &now, &now_filled, frag_point, so_locked);
10210                 if (error) {
10211                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10212                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10213                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10214                         }
10215                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10216                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10217                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10218                         }
10219                         break;
10220                 }
10221                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10222
10223                 tot_out += num_out;
10224                 burst_cnt++;
10225                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10226                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10227                         if (num_out == 0) {
10228                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10229                         }
10230                 }
10231                 if (nagle_on) {
10232                         /*
10233                          * When the Nagle algorithm is used, look at how
10234                          * much is unsent, then if its smaller than an MTU
10235                          * and we have data in flight we stop, except if we
10236                          * are handling a fragmented user message.
10237                          */
10238                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10239                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10240                             (stcb->asoc.total_flight > 0)) {
10241 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10242                                 break;
10243                         }
10244                 }
10245                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10246                     TAILQ_EMPTY(&asoc->send_queue) &&
10247                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10248                         /* Nothing left to send */
10249                         break;
10250                 }
10251                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10252                         /* Nothing left to send */
10253                         break;
10254                 }
10255         } while (num_out &&
10256             ((asoc->max_burst == 0) ||
10257             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10258             (burst_cnt < asoc->max_burst)));
10259
10260         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10261                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10262                         SCTP_STAT_INCR(sctps_maxburstqueued);
10263                         asoc->burst_limit_applied = 1;
10264                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10265                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10266                         }
10267                 } else {
10268                         asoc->burst_limit_applied = 0;
10269                 }
10270         }
10271         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10272                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10273         }
10274         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10275             tot_out);
10276
10277         /*-
10278          * Now we need to clean up the control chunk chain if a ECNE is on
10279          * it. It must be marked as UNSENT again so next call will continue
10280          * to send it until such time that we get a CWR, to remove it.
10281          */
10282         if (stcb->asoc.ecn_echo_cnt_onq)
10283                 sctp_fix_ecn_echo(asoc);
10284
10285         if (stcb->asoc.trigger_reset) {
10286                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10287                         goto do_it_again;
10288                 }
10289         }
10290         return;
10291 }
10292
10293
10294 int
10295 sctp_output(
10296     struct sctp_inpcb *inp,
10297     struct mbuf *m,
10298     struct sockaddr *addr,
10299     struct mbuf *control,
10300     struct thread *p,
10301     int flags)
10302 {
10303         if (inp == NULL) {
10304                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10305                 return (EINVAL);
10306         }
10307
10308         if (inp->sctp_socket == NULL) {
10309                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10310                 return (EINVAL);
10311         }
10312         return (sctp_sosend(inp->sctp_socket,
10313             addr,
10314             (struct uio *)NULL,
10315             m,
10316             control,
10317             flags, p
10318             ));
10319 }
10320
10321 void
10322 send_forward_tsn(struct sctp_tcb *stcb,
10323     struct sctp_association *asoc)
10324 {
10325         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10326         struct sctp_forward_tsn_chunk *fwdtsn;
10327         struct sctp_strseq *strseq;
10328         struct sctp_strseq_mid *strseq_m;
10329         uint32_t advance_peer_ack_point;
10330         unsigned int cnt_of_space, i, ovh;
10331         unsigned int space_needed;
10332         unsigned int cnt_of_skipped = 0;
10333
10334         SCTP_TCB_LOCK_ASSERT(stcb);
10335         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10336                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10337                         /* mark it to unsent */
10338                         chk->sent = SCTP_DATAGRAM_UNSENT;
10339                         chk->snd_count = 0;
10340                         /* Do we correct its output location? */
10341                         if (chk->whoTo) {
10342                                 sctp_free_remote_addr(chk->whoTo);
10343                                 chk->whoTo = NULL;
10344                         }
10345                         goto sctp_fill_in_rest;
10346                 }
10347         }
10348         /* Ok if we reach here we must build one */
10349         sctp_alloc_a_chunk(stcb, chk);
10350         if (chk == NULL) {
10351                 return;
10352         }
10353         asoc->fwd_tsn_cnt++;
10354         chk->copy_by_ref = 0;
10355         /*
10356          * We don't do the old thing here since this is used not for on-wire
10357          * but to tell if we are sending a fwd-tsn by the stack during
10358          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10359          */
10360         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10361         chk->rec.chunk_id.can_take_data = 0;
10362         chk->flags = 0;
10363         chk->asoc = asoc;
10364         chk->whoTo = NULL;
10365         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10366         if (chk->data == NULL) {
10367                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10368                 return;
10369         }
10370         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10371         chk->sent = SCTP_DATAGRAM_UNSENT;
10372         chk->snd_count = 0;
10373         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10374         asoc->ctrl_queue_cnt++;
10375 sctp_fill_in_rest:
10376         /*-
10377          * Here we go through and fill out the part that deals with
10378          * stream/seq of the ones we skip.
10379          */
10380         SCTP_BUF_LEN(chk->data) = 0;
10381         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10382                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10383                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10384                         /* no more to look at */
10385                         break;
10386                 }
10387                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10388                         /* We don't report these */
10389                         continue;
10390                 }
10391                 cnt_of_skipped++;
10392         }
10393         if (asoc->idata_supported) {
10394                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10395                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10396         } else {
10397                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10398                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10399         }
10400         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10401
10402         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10403                 ovh = SCTP_MIN_OVERHEAD;
10404         } else {
10405                 ovh = SCTP_MIN_V4_OVERHEAD;
10406         }
10407         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10408                 /* trim to a mtu size */
10409                 cnt_of_space = asoc->smallest_mtu - ovh;
10410         }
10411         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10412                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10413                     0xff, 0, cnt_of_skipped,
10414                     asoc->advanced_peer_ack_point);
10415         }
10416         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10417         if (cnt_of_space < space_needed) {
10418                 /*-
10419                  * ok we must trim down the chunk by lowering the
10420                  * advance peer ack point.
10421                  */
10422                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10423                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10424                             0xff, 0xff, cnt_of_space,
10425                             space_needed);
10426                 }
10427                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10428                 if (asoc->idata_supported) {
10429                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10430                 } else {
10431                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10432                 }
10433                 /*-
10434                  * Go through and find the TSN that will be the one
10435                  * we report.
10436                  */
10437                 at = TAILQ_FIRST(&asoc->sent_queue);
10438                 if (at != NULL) {
10439                         for (i = 0; i < cnt_of_skipped; i++) {
10440                                 tp1 = TAILQ_NEXT(at, sctp_next);
10441                                 if (tp1 == NULL) {
10442                                         break;
10443                                 }
10444                                 at = tp1;
10445                         }
10446                 }
10447                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10448                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10449                             0xff, cnt_of_skipped, at->rec.data.tsn,
10450                             asoc->advanced_peer_ack_point);
10451                 }
10452                 last = at;
10453                 /*-
10454                  * last now points to last one I can report, update
10455                  * peer ack point
10456                  */
10457                 if (last) {
10458                         advance_peer_ack_point = last->rec.data.tsn;
10459                 }
10460                 if (asoc->idata_supported) {
10461                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10462                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10463                 } else {
10464                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10465                             cnt_of_skipped * sizeof(struct sctp_strseq);
10466                 }
10467         }
10468         chk->send_size = space_needed;
10469         /* Setup the chunk */
10470         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10471         fwdtsn->ch.chunk_length = htons(chk->send_size);
10472         fwdtsn->ch.chunk_flags = 0;
10473         if (asoc->idata_supported) {
10474                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10475         } else {
10476                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10477         }
10478         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10479         SCTP_BUF_LEN(chk->data) = chk->send_size;
10480         fwdtsn++;
10481         /*-
10482          * Move pointer to after the fwdtsn and transfer to the
10483          * strseq pointer.
10484          */
10485         if (asoc->idata_supported) {
10486                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10487                 strseq = NULL;
10488         } else {
10489                 strseq = (struct sctp_strseq *)fwdtsn;
10490                 strseq_m = NULL;
10491         }
10492         /*-
10493          * Now populate the strseq list. This is done blindly
10494          * without pulling out duplicate stream info. This is
10495          * inefficent but won't harm the process since the peer will
10496          * look at these in sequence and will thus release anything.
10497          * It could mean we exceed the PMTU and chop off some that
10498          * we could have included.. but this is unlikely (aka 1432/4
10499          * would mean 300+ stream seq's would have to be reported in
10500          * one FWD-TSN. With a bit of work we can later FIX this to
10501          * optimize and pull out duplicates.. but it does add more
10502          * overhead. So for now... not!
10503          */
10504         i = 0;
10505         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10506                 if (i >= cnt_of_skipped) {
10507                         break;
10508                 }
10509                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10510                         /* We don't report these */
10511                         continue;
10512                 }
10513                 if (at->rec.data.tsn == advance_peer_ack_point) {
10514                         at->rec.data.fwd_tsn_cnt = 0;
10515                 }
10516                 if (asoc->idata_supported) {
10517                         strseq_m->sid = htons(at->rec.data.sid);
10518                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10519                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10520                         } else {
10521                                 strseq_m->flags = 0;
10522                         }
10523                         strseq_m->mid = htonl(at->rec.data.mid);
10524                         strseq_m++;
10525                 } else {
10526                         strseq->sid = htons(at->rec.data.sid);
10527                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10528                         strseq++;
10529                 }
10530                 i++;
10531         }
10532         return;
10533 }
10534
10535 void
10536 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10537 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10538     SCTP_UNUSED
10539 #endif
10540 )
10541 {
10542         /*-
10543          * Queue up a SACK or NR-SACK in the control queue.
10544          * We must first check to see if a SACK or NR-SACK is
10545          * somehow on the control queue.
10546          * If so, we will take and and remove the old one.
10547          */
10548         struct sctp_association *asoc;
10549         struct sctp_tmit_chunk *chk, *a_chk;
10550         struct sctp_sack_chunk *sack;
10551         struct sctp_nr_sack_chunk *nr_sack;
10552         struct sctp_gap_ack_block *gap_descriptor;
10553         const struct sack_track *selector;
10554         int mergeable = 0;
10555         int offset;
10556         caddr_t limit;
10557         uint32_t *dup;
10558         int limit_reached = 0;
10559         unsigned int i, siz, j;
10560         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10561         int num_dups = 0;
10562         int space_req;
10563         uint32_t highest_tsn;
10564         uint8_t flags;
10565         uint8_t type;
10566         uint8_t tsn_map;
10567
10568         if (stcb->asoc.nrsack_supported == 1) {
10569                 type = SCTP_NR_SELECTIVE_ACK;
10570         } else {
10571                 type = SCTP_SELECTIVE_ACK;
10572         }
10573         a_chk = NULL;
10574         asoc = &stcb->asoc;
10575         SCTP_TCB_LOCK_ASSERT(stcb);
10576         if (asoc->last_data_chunk_from == NULL) {
10577                 /* Hmm we never received anything */
10578                 return;
10579         }
10580         sctp_slide_mapping_arrays(stcb);
10581         sctp_set_rwnd(stcb, asoc);
10582         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10583                 if (chk->rec.chunk_id.id == type) {
10584                         /* Hmm, found a sack already on queue, remove it */
10585                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10586                         asoc->ctrl_queue_cnt--;
10587                         a_chk = chk;
10588                         if (a_chk->data) {
10589                                 sctp_m_freem(a_chk->data);
10590                                 a_chk->data = NULL;
10591                         }
10592                         if (a_chk->whoTo) {
10593                                 sctp_free_remote_addr(a_chk->whoTo);
10594                                 a_chk->whoTo = NULL;
10595                         }
10596                         break;
10597                 }
10598         }
10599         if (a_chk == NULL) {
10600                 sctp_alloc_a_chunk(stcb, a_chk);
10601                 if (a_chk == NULL) {
10602                         /* No memory so we drop the idea, and set a timer */
10603                         if (stcb->asoc.delayed_ack) {
10604                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10605                                     stcb->sctp_ep, stcb, NULL,
10606                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10607                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10608                                     stcb->sctp_ep, stcb, NULL);
10609                         } else {
10610                                 stcb->asoc.send_sack = 1;
10611                         }
10612                         return;
10613                 }
10614                 a_chk->copy_by_ref = 0;
10615                 a_chk->rec.chunk_id.id = type;
10616                 a_chk->rec.chunk_id.can_take_data = 1;
10617         }
10618         /* Clear our pkt counts */
10619         asoc->data_pkts_seen = 0;
10620
10621         a_chk->flags = 0;
10622         a_chk->asoc = asoc;
10623         a_chk->snd_count = 0;
10624         a_chk->send_size = 0;   /* fill in later */
10625         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10626         a_chk->whoTo = NULL;
10627
10628         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10629                 /*-
10630                  * Ok, the destination for the SACK is unreachable, lets see if
10631                  * we can select an alternate to asoc->last_data_chunk_from
10632                  */
10633                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10634                 if (a_chk->whoTo == NULL) {
10635                         /* Nope, no alternate */
10636                         a_chk->whoTo = asoc->last_data_chunk_from;
10637                 }
10638         } else {
10639                 a_chk->whoTo = asoc->last_data_chunk_from;
10640         }
10641         if (a_chk->whoTo) {
10642                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10643         }
10644         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10645                 highest_tsn = asoc->highest_tsn_inside_map;
10646         } else {
10647                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10648         }
10649         if (highest_tsn == asoc->cumulative_tsn) {
10650                 /* no gaps */
10651                 if (type == SCTP_SELECTIVE_ACK) {
10652                         space_req = sizeof(struct sctp_sack_chunk);
10653                 } else {
10654                         space_req = sizeof(struct sctp_nr_sack_chunk);
10655                 }
10656         } else {
10657                 /* gaps get a cluster */
10658                 space_req = MCLBYTES;
10659         }
10660         /* Ok now lets formulate a MBUF with our sack */
10661         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10662         if ((a_chk->data == NULL) ||
10663             (a_chk->whoTo == NULL)) {
10664                 /* rats, no mbuf memory */
10665                 if (a_chk->data) {
10666                         /* was a problem with the destination */
10667                         sctp_m_freem(a_chk->data);
10668                         a_chk->data = NULL;
10669                 }
10670                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10671                 /* sa_ignore NO_NULL_CHK */
10672                 if (stcb->asoc.delayed_ack) {
10673                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10674                             stcb->sctp_ep, stcb, NULL,
10675                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10676                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10677                             stcb->sctp_ep, stcb, NULL);
10678                 } else {
10679                         stcb->asoc.send_sack = 1;
10680                 }
10681                 return;
10682         }
10683         /* ok, lets go through and fill it in */
10684         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10685         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10686         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10687                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10688         }
10689         limit = mtod(a_chk->data, caddr_t);
10690         limit += space;
10691
10692         flags = 0;
10693
10694         if ((asoc->sctp_cmt_on_off > 0) &&
10695             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10696                 /*-
10697                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10698                  * received, then set high bit to 1, else 0. Reset
10699                  * pkts_rcvd.
10700                  */
10701                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10702                 asoc->cmt_dac_pkts_rcvd = 0;
10703         }
10704 #ifdef SCTP_ASOCLOG_OF_TSNS
10705         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10706         stcb->asoc.cumack_log_atsnt++;
10707         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10708                 stcb->asoc.cumack_log_atsnt = 0;
10709         }
10710 #endif
10711         /* reset the readers interpretation */
10712         stcb->freed_by_sorcv_sincelast = 0;
10713
10714         if (type == SCTP_SELECTIVE_ACK) {
10715                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10716                 nr_sack = NULL;
10717                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10718                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10719                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10720                 } else {
10721                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10722                 }
10723         } else {
10724                 sack = NULL;
10725                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10726                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10727                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10728                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10729                 } else {
10730                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10731                 }
10732         }
10733
10734         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10735                 offset = 1;
10736         } else {
10737                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10738         }
10739         if (((type == SCTP_SELECTIVE_ACK) &&
10740             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10741             ((type == SCTP_NR_SELECTIVE_ACK) &&
10742             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10743                 /* we have a gap .. maybe */
10744                 for (i = 0; i < siz; i++) {
10745                         tsn_map = asoc->mapping_array[i];
10746                         if (type == SCTP_SELECTIVE_ACK) {
10747                                 tsn_map |= asoc->nr_mapping_array[i];
10748                         }
10749                         if (i == 0) {
10750                                 /*
10751                                  * Clear all bits corresponding to TSNs
10752                                  * smaller or equal to the cumulative TSN.
10753                                  */
10754                                 tsn_map &= (~0U << (1 - offset));
10755                         }
10756                         selector = &sack_array[tsn_map];
10757                         if (mergeable && selector->right_edge) {
10758                                 /*
10759                                  * Backup, left and right edges were ok to
10760                                  * merge.
10761                                  */
10762                                 num_gap_blocks--;
10763                                 gap_descriptor--;
10764                         }
10765                         if (selector->num_entries == 0)
10766                                 mergeable = 0;
10767                         else {
10768                                 for (j = 0; j < selector->num_entries; j++) {
10769                                         if (mergeable && selector->right_edge) {
10770                                                 /*
10771                                                  * do a merge by NOT setting
10772                                                  * the left side
10773                                                  */
10774                                                 mergeable = 0;
10775                                         } else {
10776                                                 /*
10777                                                  * no merge, set the left
10778                                                  * side
10779                                                  */
10780                                                 mergeable = 0;
10781                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10782                                         }
10783                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10784                                         num_gap_blocks++;
10785                                         gap_descriptor++;
10786                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10787                                                 /* no more room */
10788                                                 limit_reached = 1;
10789                                                 break;
10790                                         }
10791                                 }
10792                                 if (selector->left_edge) {
10793                                         mergeable = 1;
10794                                 }
10795                         }
10796                         if (limit_reached) {
10797                                 /* Reached the limit stop */
10798                                 break;
10799                         }
10800                         offset += 8;
10801                 }
10802         }
10803         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10804             (limit_reached == 0)) {
10805
10806                 mergeable = 0;
10807
10808                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10809                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10810                 } else {
10811                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10812                 }
10813
10814                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10815                         offset = 1;
10816                 } else {
10817                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10818                 }
10819                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10820                         /* we have a gap .. maybe */
10821                         for (i = 0; i < siz; i++) {
10822                                 tsn_map = asoc->nr_mapping_array[i];
10823                                 if (i == 0) {
10824                                         /*
10825                                          * Clear all bits corresponding to
10826                                          * TSNs smaller or equal to the
10827                                          * cumulative TSN.
10828                                          */
10829                                         tsn_map &= (~0U << (1 - offset));
10830                                 }
10831                                 selector = &sack_array[tsn_map];
10832                                 if (mergeable && selector->right_edge) {
10833                                         /*
10834                                          * Backup, left and right edges were
10835                                          * ok to merge.
10836                                          */
10837                                         num_nr_gap_blocks--;
10838                                         gap_descriptor--;
10839                                 }
10840                                 if (selector->num_entries == 0)
10841                                         mergeable = 0;
10842                                 else {
10843                                         for (j = 0; j < selector->num_entries; j++) {
10844                                                 if (mergeable && selector->right_edge) {
10845                                                         /*
10846                                                          * do a merge by NOT
10847                                                          * setting the left
10848                                                          * side
10849                                                          */
10850                                                         mergeable = 0;
10851                                                 } else {
10852                                                         /*
10853                                                          * no merge, set the
10854                                                          * left side
10855                                                          */
10856                                                         mergeable = 0;
10857                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10858                                                 }
10859                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10860                                                 num_nr_gap_blocks++;
10861                                                 gap_descriptor++;
10862                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10863                                                         /* no more room */
10864                                                         limit_reached = 1;
10865                                                         break;
10866                                                 }
10867                                         }
10868                                         if (selector->left_edge) {
10869                                                 mergeable = 1;
10870                                         }
10871                                 }
10872                                 if (limit_reached) {
10873                                         /* Reached the limit stop */
10874                                         break;
10875                                 }
10876                                 offset += 8;
10877                         }
10878                 }
10879         }
10880         /* now we must add any dups we are going to report. */
10881         if ((limit_reached == 0) && (asoc->numduptsns)) {
10882                 dup = (uint32_t *)gap_descriptor;
10883                 for (i = 0; i < asoc->numduptsns; i++) {
10884                         *dup = htonl(asoc->dup_tsns[i]);
10885                         dup++;
10886                         num_dups++;
10887                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10888                                 /* no more room */
10889                                 break;
10890                         }
10891                 }
10892                 asoc->numduptsns = 0;
10893         }
10894         /*
10895          * now that the chunk is prepared queue it to the control chunk
10896          * queue.
10897          */
10898         if (type == SCTP_SELECTIVE_ACK) {
10899                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10900                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10901                     num_dups * sizeof(int32_t));
10902                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10903                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10904                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10905                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10906                 sack->sack.num_dup_tsns = htons(num_dups);
10907                 sack->ch.chunk_type = type;
10908                 sack->ch.chunk_flags = flags;
10909                 sack->ch.chunk_length = htons(a_chk->send_size);
10910         } else {
10911                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10912                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10913                     num_dups * sizeof(int32_t));
10914                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10915                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10916                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10917                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10918                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10919                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10920                 nr_sack->nr_sack.reserved = 0;
10921                 nr_sack->ch.chunk_type = type;
10922                 nr_sack->ch.chunk_flags = flags;
10923                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10924         }
10925         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10926         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10927         asoc->ctrl_queue_cnt++;
10928         asoc->send_sack = 0;
10929         SCTP_STAT_INCR(sctps_sendsacks);
10930         return;
10931 }
10932
10933 void
10934 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10935 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10936     SCTP_UNUSED
10937 #endif
10938 )
10939 {
10940         struct mbuf *m_abort, *m, *m_last;
10941         struct mbuf *m_out, *m_end = NULL;
10942         struct sctp_abort_chunk *abort;
10943         struct sctp_auth_chunk *auth = NULL;
10944         struct sctp_nets *net;
10945         uint32_t vtag;
10946         uint32_t auth_offset = 0;
10947         int error;
10948         uint16_t cause_len, chunk_len, padding_len;
10949
10950         SCTP_TCB_LOCK_ASSERT(stcb);
10951         /*-
10952          * Add an AUTH chunk, if chunk requires it and save the offset into
10953          * the chain for AUTH
10954          */
10955         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10956             stcb->asoc.peer_auth_chunks)) {
10957                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10958                     stcb, SCTP_ABORT_ASSOCIATION);
10959                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10960         } else {
10961                 m_out = NULL;
10962         }
10963         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10964         if (m_abort == NULL) {
10965                 if (m_out) {
10966                         sctp_m_freem(m_out);
10967                 }
10968                 if (operr) {
10969                         sctp_m_freem(operr);
10970                 }
10971                 return;
10972         }
10973         /* link in any error */
10974         SCTP_BUF_NEXT(m_abort) = operr;
10975         cause_len = 0;
10976         m_last = NULL;
10977         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10978                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10979                 if (SCTP_BUF_NEXT(m) == NULL) {
10980                         m_last = m;
10981                 }
10982         }
10983         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10984         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10985         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10986         if (m_out == NULL) {
10987                 /* NO Auth chunk prepended, so reserve space in front */
10988                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10989                 m_out = m_abort;
10990         } else {
10991                 /* Put AUTH chunk at the front of the chain */
10992                 SCTP_BUF_NEXT(m_end) = m_abort;
10993         }
10994         if (stcb->asoc.alternate) {
10995                 net = stcb->asoc.alternate;
10996         } else {
10997                 net = stcb->asoc.primary_destination;
10998         }
10999         /* Fill in the ABORT chunk header. */
11000         abort = mtod(m_abort, struct sctp_abort_chunk *);
11001         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11002         if (stcb->asoc.peer_vtag == 0) {
11003                 /* This happens iff the assoc is in COOKIE-WAIT state. */
11004                 vtag = stcb->asoc.my_vtag;
11005                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
11006         } else {
11007                 vtag = stcb->asoc.peer_vtag;
11008                 abort->ch.chunk_flags = 0;
11009         }
11010         abort->ch.chunk_length = htons(chunk_len);
11011         /* Add padding, if necessary. */
11012         if (padding_len > 0) {
11013                 if ((m_last == NULL) ||
11014                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
11015                         sctp_m_freem(m_out);
11016                         return;
11017                 }
11018         }
11019         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11020             (struct sockaddr *)&net->ro._l_addr,
11021             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
11022             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
11023             stcb->asoc.primary_destination->port, NULL,
11024             0, 0,
11025             so_locked))) {
11026                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11027                 if (error == ENOBUFS) {
11028                         stcb->asoc.ifp_had_enobuf = 1;
11029                         SCTP_STAT_INCR(sctps_lowlevelerr);
11030                 }
11031         } else {
11032                 stcb->asoc.ifp_had_enobuf = 0;
11033         }
11034         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11035 }
11036
11037 void
11038 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11039     struct sctp_nets *net,
11040     int reflect_vtag)
11041 {
11042         /* formulate and SEND a SHUTDOWN-COMPLETE */
11043         struct mbuf *m_shutdown_comp;
11044         struct sctp_shutdown_complete_chunk *shutdown_complete;
11045         uint32_t vtag;
11046         int error;
11047         uint8_t flags;
11048
11049         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11050         if (m_shutdown_comp == NULL) {
11051                 /* no mbuf's */
11052                 return;
11053         }
11054         if (reflect_vtag) {
11055                 flags = SCTP_HAD_NO_TCB;
11056                 vtag = stcb->asoc.my_vtag;
11057         } else {
11058                 flags = 0;
11059                 vtag = stcb->asoc.peer_vtag;
11060         }
11061         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11062         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11063         shutdown_complete->ch.chunk_flags = flags;
11064         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11065         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11066         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11067             (struct sockaddr *)&net->ro._l_addr,
11068             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11069             stcb->sctp_ep->sctp_lport, stcb->rport,
11070             htonl(vtag),
11071             net->port, NULL,
11072             0, 0,
11073             SCTP_SO_NOT_LOCKED))) {
11074                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11075                 if (error == ENOBUFS) {
11076                         stcb->asoc.ifp_had_enobuf = 1;
11077                         SCTP_STAT_INCR(sctps_lowlevelerr);
11078                 }
11079         } else {
11080                 stcb->asoc.ifp_had_enobuf = 0;
11081         }
11082         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11083         return;
11084 }
11085
11086 static void
11087 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11088     struct sctphdr *sh, uint32_t vtag,
11089     uint8_t type, struct mbuf *cause,
11090     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11091     uint32_t vrf_id, uint16_t port)
11092 {
11093         struct mbuf *o_pak;
11094         struct mbuf *mout;
11095         struct sctphdr *shout;
11096         struct sctp_chunkhdr *ch;
11097 #if defined(INET) || defined(INET6)
11098         struct udphdr *udp;
11099 #endif
11100         int ret, len, cause_len, padding_len;
11101 #ifdef INET
11102         struct sockaddr_in *src_sin, *dst_sin;
11103         struct ip *ip;
11104 #endif
11105 #ifdef INET6
11106         struct sockaddr_in6 *src_sin6, *dst_sin6;
11107         struct ip6_hdr *ip6;
11108 #endif
11109
11110         /* Compute the length of the cause and add final padding. */
11111         cause_len = 0;
11112         if (cause != NULL) {
11113                 struct mbuf *m_at, *m_last = NULL;
11114
11115                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11116                         if (SCTP_BUF_NEXT(m_at) == NULL)
11117                                 m_last = m_at;
11118                         cause_len += SCTP_BUF_LEN(m_at);
11119                 }
11120                 padding_len = cause_len % 4;
11121                 if (padding_len != 0) {
11122                         padding_len = 4 - padding_len;
11123                 }
11124                 if (padding_len != 0) {
11125                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11126                                 sctp_m_freem(cause);
11127                                 return;
11128                         }
11129                 }
11130         } else {
11131                 padding_len = 0;
11132         }
11133         /* Get an mbuf for the header. */
11134         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11135         switch (dst->sa_family) {
11136 #ifdef INET
11137         case AF_INET:
11138                 len += sizeof(struct ip);
11139                 break;
11140 #endif
11141 #ifdef INET6
11142         case AF_INET6:
11143                 len += sizeof(struct ip6_hdr);
11144                 break;
11145 #endif
11146         default:
11147                 break;
11148         }
11149 #if defined(INET) || defined(INET6)
11150         if (port) {
11151                 len += sizeof(struct udphdr);
11152         }
11153 #endif
11154         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11155         if (mout == NULL) {
11156                 if (cause) {
11157                         sctp_m_freem(cause);
11158                 }
11159                 return;
11160         }
11161         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11162         SCTP_BUF_LEN(mout) = len;
11163         SCTP_BUF_NEXT(mout) = cause;
11164         M_SETFIB(mout, fibnum);
11165         mout->m_pkthdr.flowid = mflowid;
11166         M_HASHTYPE_SET(mout, mflowtype);
11167 #ifdef INET
11168         ip = NULL;
11169 #endif
11170 #ifdef INET6
11171         ip6 = NULL;
11172 #endif
11173         switch (dst->sa_family) {
11174 #ifdef INET
11175         case AF_INET:
11176                 src_sin = (struct sockaddr_in *)src;
11177                 dst_sin = (struct sockaddr_in *)dst;
11178                 ip = mtod(mout, struct ip *);
11179                 ip->ip_v = IPVERSION;
11180                 ip->ip_hl = (sizeof(struct ip) >> 2);
11181                 ip->ip_tos = 0;
11182                 ip->ip_off = htons(IP_DF);
11183                 ip_fillid(ip);
11184                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11185                 if (port) {
11186                         ip->ip_p = IPPROTO_UDP;
11187                 } else {
11188                         ip->ip_p = IPPROTO_SCTP;
11189                 }
11190                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11191                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11192                 ip->ip_sum = 0;
11193                 len = sizeof(struct ip);
11194                 shout = (struct sctphdr *)((caddr_t)ip + len);
11195                 break;
11196 #endif
11197 #ifdef INET6
11198         case AF_INET6:
11199                 src_sin6 = (struct sockaddr_in6 *)src;
11200                 dst_sin6 = (struct sockaddr_in6 *)dst;
11201                 ip6 = mtod(mout, struct ip6_hdr *);
11202                 ip6->ip6_flow = htonl(0x60000000);
11203                 if (V_ip6_auto_flowlabel) {
11204                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11205                 }
11206                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11207                 if (port) {
11208                         ip6->ip6_nxt = IPPROTO_UDP;
11209                 } else {
11210                         ip6->ip6_nxt = IPPROTO_SCTP;
11211                 }
11212                 ip6->ip6_src = dst_sin6->sin6_addr;
11213                 ip6->ip6_dst = src_sin6->sin6_addr;
11214                 len = sizeof(struct ip6_hdr);
11215                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11216                 break;
11217 #endif
11218         default:
11219                 len = 0;
11220                 shout = mtod(mout, struct sctphdr *);
11221                 break;
11222         }
11223 #if defined(INET) || defined(INET6)
11224         if (port) {
11225                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11226                         sctp_m_freem(mout);
11227                         return;
11228                 }
11229                 udp = (struct udphdr *)shout;
11230                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11231                 udp->uh_dport = port;
11232                 udp->uh_sum = 0;
11233                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11234                     sizeof(struct sctphdr) +
11235                     sizeof(struct sctp_chunkhdr) +
11236                     cause_len + padding_len));
11237                 len += sizeof(struct udphdr);
11238                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11239         } else {
11240                 udp = NULL;
11241         }
11242 #endif
11243         shout->src_port = sh->dest_port;
11244         shout->dest_port = sh->src_port;
11245         shout->checksum = 0;
11246         if (vtag) {
11247                 shout->v_tag = htonl(vtag);
11248         } else {
11249                 shout->v_tag = sh->v_tag;
11250         }
11251         len += sizeof(struct sctphdr);
11252         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11253         ch->chunk_type = type;
11254         if (vtag) {
11255                 ch->chunk_flags = 0;
11256         } else {
11257                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11258         }
11259         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11260         len += sizeof(struct sctp_chunkhdr);
11261         len += cause_len + padding_len;
11262
11263         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11264                 sctp_m_freem(mout);
11265                 return;
11266         }
11267         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11268         switch (dst->sa_family) {
11269 #ifdef INET
11270         case AF_INET:
11271                 if (port) {
11272                         if (V_udp_cksum) {
11273                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11274                         } else {
11275                                 udp->uh_sum = 0;
11276                         }
11277                 }
11278                 ip->ip_len = htons(len);
11279                 if (port) {
11280                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11281                         SCTP_STAT_INCR(sctps_sendswcrc);
11282                         if (V_udp_cksum) {
11283                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11284                         }
11285                 } else {
11286                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11287                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11288                         SCTP_STAT_INCR(sctps_sendhwcrc);
11289                 }
11290 #ifdef SCTP_PACKET_LOGGING
11291                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11292                         sctp_packet_log(o_pak);
11293                 }
11294 #endif
11295                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11296                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11297                 break;
11298 #endif
11299 #ifdef INET6
11300         case AF_INET6:
11301                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11302                 if (port) {
11303                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11304                         SCTP_STAT_INCR(sctps_sendswcrc);
11305                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11306                                 udp->uh_sum = 0xffff;
11307                         }
11308                 } else {
11309                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11310                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11311                         SCTP_STAT_INCR(sctps_sendhwcrc);
11312                 }
11313 #ifdef SCTP_PACKET_LOGGING
11314                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11315                         sctp_packet_log(o_pak);
11316                 }
11317 #endif
11318                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11319                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11320                 break;
11321 #endif
11322         default:
11323                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11324                     dst->sa_family);
11325                 sctp_m_freem(mout);
11326                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11327                 return;
11328         }
11329         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11330         if (port) {
11331                 UDPSTAT_INC(udps_opackets);
11332         }
11333         SCTP_STAT_INCR(sctps_sendpackets);
11334         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11335         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11336         if (ret) {
11337                 SCTP_STAT_INCR(sctps_senderrors);
11338         }
11339         return;
11340 }
11341
11342 void
11343 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11344     struct sctphdr *sh,
11345     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11346     uint32_t vrf_id, uint16_t port)
11347 {
11348         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11349             mflowtype, mflowid, fibnum,
11350             vrf_id, port);
11351 }
11352
11353 void
11354 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11355 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11356     SCTP_UNUSED
11357 #endif
11358 )
11359 {
11360         struct sctp_tmit_chunk *chk;
11361         struct sctp_heartbeat_chunk *hb;
11362         struct timeval now;
11363
11364         SCTP_TCB_LOCK_ASSERT(stcb);
11365         if (net == NULL) {
11366                 return;
11367         }
11368         (void)SCTP_GETTIME_TIMEVAL(&now);
11369         switch (net->ro._l_addr.sa.sa_family) {
11370 #ifdef INET
11371         case AF_INET:
11372                 break;
11373 #endif
11374 #ifdef INET6
11375         case AF_INET6:
11376                 break;
11377 #endif
11378         default:
11379                 return;
11380         }
11381         sctp_alloc_a_chunk(stcb, chk);
11382         if (chk == NULL) {
11383                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11384                 return;
11385         }
11386
11387         chk->copy_by_ref = 0;
11388         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11389         chk->rec.chunk_id.can_take_data = 1;
11390         chk->flags = 0;
11391         chk->asoc = &stcb->asoc;
11392         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11393
11394         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11395         if (chk->data == NULL) {
11396                 sctp_free_a_chunk(stcb, chk, so_locked);
11397                 return;
11398         }
11399         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11400         SCTP_BUF_LEN(chk->data) = chk->send_size;
11401         chk->sent = SCTP_DATAGRAM_UNSENT;
11402         chk->snd_count = 0;
11403         chk->whoTo = net;
11404         atomic_add_int(&chk->whoTo->ref_count, 1);
11405         /* Now we have a mbuf that we can fill in with the details */
11406         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11407         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11408         /* fill out chunk header */
11409         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11410         hb->ch.chunk_flags = 0;
11411         hb->ch.chunk_length = htons(chk->send_size);
11412         /* Fill out hb parameter */
11413         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11414         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11415         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11416         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11417         /* Did our user request this one, put it in */
11418         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11419         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11420         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11421                 /*
11422                  * we only take from the entropy pool if the address is not
11423                  * confirmed.
11424                  */
11425                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11426                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11427         } else {
11428                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11429                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11430         }
11431         switch (net->ro._l_addr.sa.sa_family) {
11432 #ifdef INET
11433         case AF_INET:
11434                 memcpy(hb->heartbeat.hb_info.address,
11435                     &net->ro._l_addr.sin.sin_addr,
11436                     sizeof(net->ro._l_addr.sin.sin_addr));
11437                 break;
11438 #endif
11439 #ifdef INET6
11440         case AF_INET6:
11441                 memcpy(hb->heartbeat.hb_info.address,
11442                     &net->ro._l_addr.sin6.sin6_addr,
11443                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11444                 break;
11445 #endif
11446         default:
11447                 if (chk->data) {
11448                         sctp_m_freem(chk->data);
11449                         chk->data = NULL;
11450                 }
11451                 sctp_free_a_chunk(stcb, chk, so_locked);
11452                 return;
11453                 break;
11454         }
11455         net->hb_responded = 0;
11456         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11457         stcb->asoc.ctrl_queue_cnt++;
11458         SCTP_STAT_INCR(sctps_sendheartbeat);
11459         return;
11460 }
11461
11462 void
11463 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11464     uint32_t high_tsn)
11465 {
11466         struct sctp_association *asoc;
11467         struct sctp_ecne_chunk *ecne;
11468         struct sctp_tmit_chunk *chk;
11469
11470         if (net == NULL) {
11471                 return;
11472         }
11473         asoc = &stcb->asoc;
11474         SCTP_TCB_LOCK_ASSERT(stcb);
11475         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11476                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11477                         /* found a previous ECN_ECHO update it if needed */
11478                         uint32_t cnt, ctsn;
11479
11480                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11481                         ctsn = ntohl(ecne->tsn);
11482                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11483                                 ecne->tsn = htonl(high_tsn);
11484                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11485                         }
11486                         cnt = ntohl(ecne->num_pkts_since_cwr);
11487                         cnt++;
11488                         ecne->num_pkts_since_cwr = htonl(cnt);
11489                         return;
11490                 }
11491         }
11492         /* nope could not find one to update so we must build one */
11493         sctp_alloc_a_chunk(stcb, chk);
11494         if (chk == NULL) {
11495                 return;
11496         }
11497         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11498         chk->copy_by_ref = 0;
11499         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11500         chk->rec.chunk_id.can_take_data = 0;
11501         chk->flags = 0;
11502         chk->asoc = &stcb->asoc;
11503         chk->send_size = sizeof(struct sctp_ecne_chunk);
11504         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11505         if (chk->data == NULL) {
11506                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11507                 return;
11508         }
11509         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11510         SCTP_BUF_LEN(chk->data) = chk->send_size;
11511         chk->sent = SCTP_DATAGRAM_UNSENT;
11512         chk->snd_count = 0;
11513         chk->whoTo = net;
11514         atomic_add_int(&chk->whoTo->ref_count, 1);
11515
11516         stcb->asoc.ecn_echo_cnt_onq++;
11517         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11518         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11519         ecne->ch.chunk_flags = 0;
11520         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11521         ecne->tsn = htonl(high_tsn);
11522         ecne->num_pkts_since_cwr = htonl(1);
11523         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11524         asoc->ctrl_queue_cnt++;
11525 }
11526
11527 void
11528 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11529     struct mbuf *m, int len, int iphlen, int bad_crc)
11530 {
11531         struct sctp_association *asoc;
11532         struct sctp_pktdrop_chunk *drp;
11533         struct sctp_tmit_chunk *chk;
11534         uint8_t *datap;
11535         int was_trunc = 0;
11536         int fullsz = 0;
11537         long spc;
11538         int offset;
11539         struct sctp_chunkhdr *ch, chunk_buf;
11540         unsigned int chk_length;
11541
11542         if (!stcb) {
11543                 return;
11544         }
11545         asoc = &stcb->asoc;
11546         SCTP_TCB_LOCK_ASSERT(stcb);
11547         if (asoc->pktdrop_supported == 0) {
11548                 /*-
11549                  * peer must declare support before I send one.
11550                  */
11551                 return;
11552         }
11553         if (stcb->sctp_socket == NULL) {
11554                 return;
11555         }
11556         sctp_alloc_a_chunk(stcb, chk);
11557         if (chk == NULL) {
11558                 return;
11559         }
11560         chk->copy_by_ref = 0;
11561         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11562         chk->rec.chunk_id.can_take_data = 1;
11563         chk->flags = 0;
11564         len -= iphlen;
11565         chk->send_size = len;
11566         /* Validate that we do not have an ABORT in here. */
11567         offset = iphlen + sizeof(struct sctphdr);
11568         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11569             sizeof(*ch), (uint8_t *)&chunk_buf);
11570         while (ch != NULL) {
11571                 chk_length = ntohs(ch->chunk_length);
11572                 if (chk_length < sizeof(*ch)) {
11573                         /* break to abort land */
11574                         break;
11575                 }
11576                 switch (ch->chunk_type) {
11577                 case SCTP_PACKET_DROPPED:
11578                 case SCTP_ABORT_ASSOCIATION:
11579                 case SCTP_INITIATION_ACK:
11580                         /**
11581                          * We don't respond with an PKT-DROP to an ABORT
11582                          * or PKT-DROP. We also do not respond to an
11583                          * INIT-ACK, because we can't know if the initiation
11584                          * tag is correct or not.
11585                          */
11586                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11587                         return;
11588                 default:
11589                         break;
11590                 }
11591                 offset += SCTP_SIZE32(chk_length);
11592                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11593                     sizeof(*ch), (uint8_t *)&chunk_buf);
11594         }
11595
11596         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11597             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11598                 /*
11599                  * only send 1 mtu worth, trim off the excess on the end.
11600                  */
11601                 fullsz = len;
11602                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11603                 was_trunc = 1;
11604         }
11605         chk->asoc = &stcb->asoc;
11606         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11607         if (chk->data == NULL) {
11608 jump_out:
11609                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11610                 return;
11611         }
11612         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11613         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11614         if (drp == NULL) {
11615                 sctp_m_freem(chk->data);
11616                 chk->data = NULL;
11617                 goto jump_out;
11618         }
11619         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11620             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11621         chk->book_size_scale = 0;
11622         if (was_trunc) {
11623                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11624                 drp->trunc_len = htons(fullsz);
11625                 /*
11626                  * Len is already adjusted to size minus overhead above take
11627                  * out the pkt_drop chunk itself from it.
11628                  */
11629                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11630                 len = chk->send_size;
11631         } else {
11632                 /* no truncation needed */
11633                 drp->ch.chunk_flags = 0;
11634                 drp->trunc_len = htons(0);
11635         }
11636         if (bad_crc) {
11637                 drp->ch.chunk_flags |= SCTP_BADCRC;
11638         }
11639         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11640         SCTP_BUF_LEN(chk->data) = chk->send_size;
11641         chk->sent = SCTP_DATAGRAM_UNSENT;
11642         chk->snd_count = 0;
11643         if (net) {
11644                 /* we should hit here */
11645                 chk->whoTo = net;
11646                 atomic_add_int(&chk->whoTo->ref_count, 1);
11647         } else {
11648                 chk->whoTo = NULL;
11649         }
11650         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11651         drp->ch.chunk_length = htons(chk->send_size);
11652         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11653         if (spc < 0) {
11654                 spc = 0;
11655         }
11656         drp->bottle_bw = htonl(spc);
11657         if (asoc->my_rwnd) {
11658                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11659                     asoc->size_on_all_streams +
11660                     asoc->my_rwnd_control_len +
11661                     stcb->sctp_socket->so_rcv.sb_cc);
11662         } else {
11663                 /*-
11664                  * If my rwnd is 0, possibly from mbuf depletion as well as
11665                  * space used, tell the peer there is NO space aka onq == bw
11666                  */
11667                 drp->current_onq = htonl(spc);
11668         }
11669         drp->reserved = 0;
11670         datap = drp->data;
11671         m_copydata(m, iphlen, len, (caddr_t)datap);
11672         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11673         asoc->ctrl_queue_cnt++;
11674 }
11675
11676 void
11677 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11678 {
11679         struct sctp_association *asoc;
11680         struct sctp_cwr_chunk *cwr;
11681         struct sctp_tmit_chunk *chk;
11682
11683         SCTP_TCB_LOCK_ASSERT(stcb);
11684         if (net == NULL) {
11685                 return;
11686         }
11687         asoc = &stcb->asoc;
11688         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11689                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11690                         /*
11691                          * found a previous CWR queued to same destination
11692                          * update it if needed
11693                          */
11694                         uint32_t ctsn;
11695
11696                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11697                         ctsn = ntohl(cwr->tsn);
11698                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11699                                 cwr->tsn = htonl(high_tsn);
11700                         }
11701                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11702                                 /* Make sure override is carried */
11703                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11704                         }
11705                         return;
11706                 }
11707         }
11708         sctp_alloc_a_chunk(stcb, chk);
11709         if (chk == NULL) {
11710                 return;
11711         }
11712         chk->copy_by_ref = 0;
11713         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11714         chk->rec.chunk_id.can_take_data = 1;
11715         chk->flags = 0;
11716         chk->asoc = &stcb->asoc;
11717         chk->send_size = sizeof(struct sctp_cwr_chunk);
11718         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11719         if (chk->data == NULL) {
11720                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11721                 return;
11722         }
11723         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11724         SCTP_BUF_LEN(chk->data) = chk->send_size;
11725         chk->sent = SCTP_DATAGRAM_UNSENT;
11726         chk->snd_count = 0;
11727         chk->whoTo = net;
11728         atomic_add_int(&chk->whoTo->ref_count, 1);
11729         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11730         cwr->ch.chunk_type = SCTP_ECN_CWR;
11731         cwr->ch.chunk_flags = override;
11732         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11733         cwr->tsn = htonl(high_tsn);
11734         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11735         asoc->ctrl_queue_cnt++;
11736 }
11737
11738 static int
11739 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11740     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11741 {
11742         uint16_t len, old_len, i;
11743         struct sctp_stream_reset_out_request *req_out;
11744         struct sctp_chunkhdr *ch;
11745         int at;
11746         int number_entries = 0;
11747
11748         ch = mtod(chk->data, struct sctp_chunkhdr *);
11749         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11750         /* get to new offset for the param. */
11751         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11752         /* now how long will this param be? */
11753         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11754                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11755                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11756                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11757                         number_entries++;
11758                 }
11759         }
11760         if (number_entries == 0) {
11761                 return (0);
11762         }
11763         if (number_entries == stcb->asoc.streamoutcnt) {
11764                 number_entries = 0;
11765         }
11766         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11767                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11768         }
11769         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11770         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11771         req_out->ph.param_length = htons(len);
11772         req_out->request_seq = htonl(seq);
11773         req_out->response_seq = htonl(resp_seq);
11774         req_out->send_reset_at_tsn = htonl(last_sent);
11775         at = 0;
11776         if (number_entries) {
11777                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11778                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11779                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11780                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11781                                 req_out->list_of_streams[at] = htons(i);
11782                                 at++;
11783                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11784                                 if (at >= number_entries) {
11785                                         break;
11786                                 }
11787                         }
11788                 }
11789         } else {
11790                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11791                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11792                 }
11793         }
11794         if (SCTP_SIZE32(len) > len) {
11795                 /*-
11796                  * Need to worry about the pad we may end up adding to the
11797                  * end. This is easy since the struct is either aligned to 4
11798                  * bytes or 2 bytes off.
11799                  */
11800                 req_out->list_of_streams[number_entries] = 0;
11801         }
11802         /* now fix the chunk length */
11803         ch->chunk_length = htons(len + old_len);
11804         chk->book_size = len + old_len;
11805         chk->book_size_scale = 0;
11806         chk->send_size = SCTP_SIZE32(chk->book_size);
11807         SCTP_BUF_LEN(chk->data) = chk->send_size;
11808         return (1);
11809 }
11810
11811 static void
11812 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11813     int number_entries, uint16_t *list,
11814     uint32_t seq)
11815 {
11816         uint16_t len, old_len, i;
11817         struct sctp_stream_reset_in_request *req_in;
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_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11825         /* now how long will this param be? */
11826         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11827         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11828         req_in->ph.param_length = htons(len);
11829         req_in->request_seq = htonl(seq);
11830         if (number_entries) {
11831                 for (i = 0; i < number_entries; i++) {
11832                         req_in->list_of_streams[i] = htons(list[i]);
11833                 }
11834         }
11835         if (SCTP_SIZE32(len) > len) {
11836                 /*-
11837                  * Need to worry about the pad we may end up adding to the
11838                  * end. This is easy since the struct is either aligned to 4
11839                  * bytes or 2 bytes off.
11840                  */
11841                 req_in->list_of_streams[number_entries] = 0;
11842         }
11843         /* now fix the chunk length */
11844         ch->chunk_length = htons(len + old_len);
11845         chk->book_size = len + old_len;
11846         chk->book_size_scale = 0;
11847         chk->send_size = SCTP_SIZE32(chk->book_size);
11848         SCTP_BUF_LEN(chk->data) = chk->send_size;
11849         return;
11850 }
11851
11852 static void
11853 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11854     uint32_t seq)
11855 {
11856         uint16_t len, old_len;
11857         struct sctp_stream_reset_tsn_request *req_tsn;
11858         struct sctp_chunkhdr *ch;
11859
11860         ch = mtod(chk->data, struct sctp_chunkhdr *);
11861         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11862
11863         /* get to new offset for the param. */
11864         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11865         /* now how long will this param be? */
11866         len = sizeof(struct sctp_stream_reset_tsn_request);
11867         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11868         req_tsn->ph.param_length = htons(len);
11869         req_tsn->request_seq = htonl(seq);
11870
11871         /* now fix the chunk length */
11872         ch->chunk_length = htons(len + old_len);
11873         chk->send_size = len + old_len;
11874         chk->book_size = SCTP_SIZE32(chk->send_size);
11875         chk->book_size_scale = 0;
11876         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11877         return;
11878 }
11879
11880 void
11881 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11882     uint32_t resp_seq, uint32_t result)
11883 {
11884         uint16_t len, old_len;
11885         struct sctp_stream_reset_response *resp;
11886         struct sctp_chunkhdr *ch;
11887
11888         ch = mtod(chk->data, struct sctp_chunkhdr *);
11889         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11890
11891         /* get to new offset for the param. */
11892         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11893         /* now how long will this param be? */
11894         len = sizeof(struct sctp_stream_reset_response);
11895         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11896         resp->ph.param_length = htons(len);
11897         resp->response_seq = htonl(resp_seq);
11898         resp->result = ntohl(result);
11899
11900         /* now fix the chunk length */
11901         ch->chunk_length = htons(len + old_len);
11902         chk->book_size = len + old_len;
11903         chk->book_size_scale = 0;
11904         chk->send_size = SCTP_SIZE32(chk->book_size);
11905         SCTP_BUF_LEN(chk->data) = chk->send_size;
11906         return;
11907 }
11908
11909 void
11910 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11911     struct sctp_stream_reset_list *ent,
11912     int response)
11913 {
11914         struct sctp_association *asoc;
11915         struct sctp_tmit_chunk *chk;
11916         struct sctp_chunkhdr *ch;
11917
11918         asoc = &stcb->asoc;
11919
11920         /*
11921          * Reset our last reset action to the new one IP -> response
11922          * (PERFORMED probably). This assures that if we fail to send, a
11923          * retran from the peer will get the new response.
11924          */
11925         asoc->last_reset_action[0] = response;
11926         if (asoc->stream_reset_outstanding) {
11927                 return;
11928         }
11929         sctp_alloc_a_chunk(stcb, chk);
11930         if (chk == NULL) {
11931                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11932                 return;
11933         }
11934         chk->copy_by_ref = 0;
11935         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11936         chk->rec.chunk_id.can_take_data = 0;
11937         chk->flags = 0;
11938         chk->asoc = &stcb->asoc;
11939         chk->book_size = sizeof(struct sctp_chunkhdr);
11940         chk->send_size = SCTP_SIZE32(chk->book_size);
11941         chk->book_size_scale = 0;
11942         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11943         if (chk->data == NULL) {
11944                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11945                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11946                 return;
11947         }
11948         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11949         /* setup chunk parameters */
11950         chk->sent = SCTP_DATAGRAM_UNSENT;
11951         chk->snd_count = 0;
11952         if (stcb->asoc.alternate) {
11953                 chk->whoTo = stcb->asoc.alternate;
11954         } else {
11955                 chk->whoTo = stcb->asoc.primary_destination;
11956         }
11957         ch = mtod(chk->data, struct sctp_chunkhdr *);
11958         ch->chunk_type = SCTP_STREAM_RESET;
11959         ch->chunk_flags = 0;
11960         ch->chunk_length = htons(chk->book_size);
11961         atomic_add_int(&chk->whoTo->ref_count, 1);
11962         SCTP_BUF_LEN(chk->data) = chk->send_size;
11963         sctp_add_stream_reset_result(chk, ent->seq, response);
11964         /* insert the chunk for sending */
11965         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11966             chk,
11967             sctp_next);
11968         asoc->ctrl_queue_cnt++;
11969 }
11970
11971 void
11972 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11973     uint32_t resp_seq, uint32_t result,
11974     uint32_t send_una, uint32_t recv_next)
11975 {
11976         uint16_t len, old_len;
11977         struct sctp_stream_reset_response_tsn *resp;
11978         struct sctp_chunkhdr *ch;
11979
11980         ch = mtod(chk->data, struct sctp_chunkhdr *);
11981         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11982
11983         /* get to new offset for the param. */
11984         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11985         /* now how long will this param be? */
11986         len = sizeof(struct sctp_stream_reset_response_tsn);
11987         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11988         resp->ph.param_length = htons(len);
11989         resp->response_seq = htonl(resp_seq);
11990         resp->result = htonl(result);
11991         resp->senders_next_tsn = htonl(send_una);
11992         resp->receivers_next_tsn = htonl(recv_next);
11993
11994         /* now fix the chunk length */
11995         ch->chunk_length = htons(len + old_len);
11996         chk->book_size = len + old_len;
11997         chk->send_size = SCTP_SIZE32(chk->book_size);
11998         chk->book_size_scale = 0;
11999         SCTP_BUF_LEN(chk->data) = chk->send_size;
12000         return;
12001 }
12002
12003 static void
12004 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
12005     uint32_t seq,
12006     uint16_t adding)
12007 {
12008         uint16_t len, old_len;
12009         struct sctp_chunkhdr *ch;
12010         struct sctp_stream_reset_add_strm *addstr;
12011
12012         ch = mtod(chk->data, struct sctp_chunkhdr *);
12013         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12014
12015         /* get to new offset for the param. */
12016         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12017         /* now how long will this param be? */
12018         len = sizeof(struct sctp_stream_reset_add_strm);
12019
12020         /* Fill it out. */
12021         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12022         addstr->ph.param_length = htons(len);
12023         addstr->request_seq = htonl(seq);
12024         addstr->number_of_streams = htons(adding);
12025         addstr->reserved = 0;
12026
12027         /* now fix the chunk length */
12028         ch->chunk_length = htons(len + old_len);
12029         chk->send_size = len + old_len;
12030         chk->book_size = SCTP_SIZE32(chk->send_size);
12031         chk->book_size_scale = 0;
12032         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12033         return;
12034 }
12035
12036 static void
12037 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12038     uint32_t seq,
12039     uint16_t adding)
12040 {
12041         uint16_t len, old_len;
12042         struct sctp_chunkhdr *ch;
12043         struct sctp_stream_reset_add_strm *addstr;
12044
12045         ch = mtod(chk->data, struct sctp_chunkhdr *);
12046         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12047
12048         /* get to new offset for the param. */
12049         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12050         /* now how long will this param be? */
12051         len = sizeof(struct sctp_stream_reset_add_strm);
12052         /* Fill it out. */
12053         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12054         addstr->ph.param_length = htons(len);
12055         addstr->request_seq = htonl(seq);
12056         addstr->number_of_streams = htons(adding);
12057         addstr->reserved = 0;
12058
12059         /* now fix the chunk length */
12060         ch->chunk_length = htons(len + old_len);
12061         chk->send_size = len + old_len;
12062         chk->book_size = SCTP_SIZE32(chk->send_size);
12063         chk->book_size_scale = 0;
12064         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12065         return;
12066 }
12067
12068 int
12069 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12070 {
12071         struct sctp_association *asoc;
12072         struct sctp_tmit_chunk *chk;
12073         struct sctp_chunkhdr *ch;
12074         uint32_t seq;
12075
12076         asoc = &stcb->asoc;
12077         asoc->trigger_reset = 0;
12078         if (asoc->stream_reset_outstanding) {
12079                 return (EALREADY);
12080         }
12081         sctp_alloc_a_chunk(stcb, chk);
12082         if (chk == NULL) {
12083                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12084                 return (ENOMEM);
12085         }
12086         chk->copy_by_ref = 0;
12087         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12088         chk->rec.chunk_id.can_take_data = 0;
12089         chk->flags = 0;
12090         chk->asoc = &stcb->asoc;
12091         chk->book_size = sizeof(struct sctp_chunkhdr);
12092         chk->send_size = SCTP_SIZE32(chk->book_size);
12093         chk->book_size_scale = 0;
12094         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12095         if (chk->data == NULL) {
12096                 sctp_free_a_chunk(stcb, chk, so_locked);
12097                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12098                 return (ENOMEM);
12099         }
12100         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12101
12102         /* setup chunk parameters */
12103         chk->sent = SCTP_DATAGRAM_UNSENT;
12104         chk->snd_count = 0;
12105         if (stcb->asoc.alternate) {
12106                 chk->whoTo = stcb->asoc.alternate;
12107         } else {
12108                 chk->whoTo = stcb->asoc.primary_destination;
12109         }
12110         ch = mtod(chk->data, struct sctp_chunkhdr *);
12111         ch->chunk_type = SCTP_STREAM_RESET;
12112         ch->chunk_flags = 0;
12113         ch->chunk_length = htons(chk->book_size);
12114         atomic_add_int(&chk->whoTo->ref_count, 1);
12115         SCTP_BUF_LEN(chk->data) = chk->send_size;
12116         seq = stcb->asoc.str_reset_seq_out;
12117         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12118                 seq++;
12119                 asoc->stream_reset_outstanding++;
12120         } else {
12121                 m_freem(chk->data);
12122                 chk->data = NULL;
12123                 sctp_free_a_chunk(stcb, chk, so_locked);
12124                 return (ENOENT);
12125         }
12126         asoc->str_reset = chk;
12127         /* insert the chunk for sending */
12128         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12129             chk,
12130             sctp_next);
12131         asoc->ctrl_queue_cnt++;
12132
12133         if (stcb->asoc.send_sack) {
12134                 sctp_send_sack(stcb, so_locked);
12135         }
12136         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12137         return (0);
12138 }
12139
12140 int
12141 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12142     uint16_t number_entries, uint16_t *list,
12143     uint8_t send_in_req,
12144     uint8_t send_tsn_req,
12145     uint8_t add_stream,
12146     uint16_t adding_o,
12147     uint16_t adding_i, uint8_t peer_asked)
12148 {
12149         struct sctp_association *asoc;
12150         struct sctp_tmit_chunk *chk;
12151         struct sctp_chunkhdr *ch;
12152         int can_send_out_req = 0;
12153         uint32_t seq;
12154
12155         asoc = &stcb->asoc;
12156         if (asoc->stream_reset_outstanding) {
12157                 /*-
12158                  * Already one pending, must get ACK back to clear the flag.
12159                  */
12160                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12161                 return (EBUSY);
12162         }
12163         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12164             (add_stream == 0)) {
12165                 /* nothing to do */
12166                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12167                 return (EINVAL);
12168         }
12169         if (send_tsn_req && send_in_req) {
12170                 /* error, can't do that */
12171                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12172                 return (EINVAL);
12173         } else if (send_in_req) {
12174                 can_send_out_req = 1;
12175         }
12176         if (number_entries > (MCLBYTES -
12177             SCTP_MIN_OVERHEAD -
12178             sizeof(struct sctp_chunkhdr) -
12179             sizeof(struct sctp_stream_reset_out_request)) /
12180             sizeof(uint16_t)) {
12181                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12182                 return (ENOMEM);
12183         }
12184         sctp_alloc_a_chunk(stcb, chk);
12185         if (chk == NULL) {
12186                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12187                 return (ENOMEM);
12188         }
12189         chk->copy_by_ref = 0;
12190         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12191         chk->rec.chunk_id.can_take_data = 0;
12192         chk->flags = 0;
12193         chk->asoc = &stcb->asoc;
12194         chk->book_size = sizeof(struct sctp_chunkhdr);
12195         chk->send_size = SCTP_SIZE32(chk->book_size);
12196         chk->book_size_scale = 0;
12197         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12198         if (chk->data == NULL) {
12199                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12200                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12201                 return (ENOMEM);
12202         }
12203         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12204
12205         /* setup chunk parameters */
12206         chk->sent = SCTP_DATAGRAM_UNSENT;
12207         chk->snd_count = 0;
12208         if (stcb->asoc.alternate) {
12209                 chk->whoTo = stcb->asoc.alternate;
12210         } else {
12211                 chk->whoTo = stcb->asoc.primary_destination;
12212         }
12213         atomic_add_int(&chk->whoTo->ref_count, 1);
12214         ch = mtod(chk->data, struct sctp_chunkhdr *);
12215         ch->chunk_type = SCTP_STREAM_RESET;
12216         ch->chunk_flags = 0;
12217         ch->chunk_length = htons(chk->book_size);
12218         SCTP_BUF_LEN(chk->data) = chk->send_size;
12219
12220         seq = stcb->asoc.str_reset_seq_out;
12221         if (can_send_out_req) {
12222                 int ret;
12223
12224                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12225                 if (ret) {
12226                         seq++;
12227                         asoc->stream_reset_outstanding++;
12228                 }
12229         }
12230         if ((add_stream & 1) &&
12231             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12232                 /* Need to allocate more */
12233                 struct sctp_stream_out *oldstream;
12234                 struct sctp_stream_queue_pending *sp, *nsp;
12235                 int i;
12236 #if defined(SCTP_DETAILED_STR_STATS)
12237                 int j;
12238 #endif
12239
12240                 oldstream = stcb->asoc.strmout;
12241                 /* get some more */
12242                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12243                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12244                     SCTP_M_STRMO);
12245                 if (stcb->asoc.strmout == NULL) {
12246                         uint8_t x;
12247
12248                         stcb->asoc.strmout = oldstream;
12249                         /* Turn off the bit */
12250                         x = add_stream & 0xfe;
12251                         add_stream = x;
12252                         goto skip_stuff;
12253                 }
12254                 /*
12255                  * Ok now we proceed with copying the old out stuff and
12256                  * initializing the new stuff.
12257                  */
12258                 SCTP_TCB_SEND_LOCK(stcb);
12259                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12260                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12261                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12262                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12263                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12264                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12265                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12266                         stcb->asoc.strmout[i].sid = i;
12267                         stcb->asoc.strmout[i].state = oldstream[i].state;
12268                         /* FIX ME FIX ME */
12269                         /*
12270                          * This should be a SS_COPY operation FIX ME STREAM
12271                          * SCHEDULER EXPERT
12272                          */
12273                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12274                         /* now anything on those queues? */
12275                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12276                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12277                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12278                         }
12279
12280                 }
12281                 /* now the new streams */
12282                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12283                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12284                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12285                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12286 #if defined(SCTP_DETAILED_STR_STATS)
12287                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12288                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12289                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12290                         }
12291 #else
12292                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12293                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12294 #endif
12295                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12296                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12297                         stcb->asoc.strmout[i].sid = i;
12298                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12299                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12300                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12301                 }
12302                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12303                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12304                 SCTP_TCB_SEND_UNLOCK(stcb);
12305         }
12306 skip_stuff:
12307         if ((add_stream & 1) && (adding_o > 0)) {
12308                 asoc->strm_pending_add_size = adding_o;
12309                 asoc->peer_req_out = peer_asked;
12310                 sctp_add_an_out_stream(chk, seq, adding_o);
12311                 seq++;
12312                 asoc->stream_reset_outstanding++;
12313         }
12314         if ((add_stream & 2) && (adding_i > 0)) {
12315                 sctp_add_an_in_stream(chk, seq, adding_i);
12316                 seq++;
12317                 asoc->stream_reset_outstanding++;
12318         }
12319         if (send_in_req) {
12320                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12321                 seq++;
12322                 asoc->stream_reset_outstanding++;
12323         }
12324         if (send_tsn_req) {
12325                 sctp_add_stream_reset_tsn(chk, seq);
12326                 asoc->stream_reset_outstanding++;
12327         }
12328         asoc->str_reset = chk;
12329         /* insert the chunk for sending */
12330         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12331             chk,
12332             sctp_next);
12333         asoc->ctrl_queue_cnt++;
12334         if (stcb->asoc.send_sack) {
12335                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12336         }
12337         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12338         return (0);
12339 }
12340
12341 void
12342 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12343     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12344     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12345     uint32_t vrf_id, uint16_t port)
12346 {
12347         /* Don't respond to an ABORT with an ABORT. */
12348         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12349                 if (cause)
12350                         sctp_m_freem(cause);
12351                 return;
12352         }
12353         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12354             mflowtype, mflowid, fibnum,
12355             vrf_id, port);
12356         return;
12357 }
12358
12359 void
12360 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12361     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12362     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12363     uint32_t vrf_id, uint16_t port)
12364 {
12365         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12366             mflowtype, mflowid, fibnum,
12367             vrf_id, port);
12368         return;
12369 }
12370
12371 static struct mbuf *
12372 sctp_copy_resume(struct uio *uio,
12373     int max_send_len,
12374     int user_marks_eor,
12375     int *error,
12376     uint32_t *sndout,
12377     struct mbuf **new_tail)
12378 {
12379         struct mbuf *m;
12380
12381         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12382             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12383         if (m == NULL) {
12384                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12385                 *error = ENOBUFS;
12386         } else {
12387                 *sndout = m_length(m, NULL);
12388                 *new_tail = m_last(m);
12389         }
12390         return (m);
12391 }
12392
12393 static int
12394 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12395     struct uio *uio,
12396     int resv_upfront)
12397 {
12398         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12399             resv_upfront, 0);
12400         if (sp->data == NULL) {
12401                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12402                 return (ENOBUFS);
12403         }
12404
12405         sp->tail_mbuf = m_last(sp->data);
12406         return (0);
12407 }
12408
12409
12410
12411 static struct sctp_stream_queue_pending *
12412 sctp_copy_it_in(struct sctp_tcb *stcb,
12413     struct sctp_association *asoc,
12414     struct sctp_sndrcvinfo *srcv,
12415     struct uio *uio,
12416     struct sctp_nets *net,
12417     ssize_t max_send_len,
12418     int user_marks_eor,
12419     int *error)
12420 {
12421
12422         /*-
12423          * This routine must be very careful in its work. Protocol
12424          * processing is up and running so care must be taken to spl...()
12425          * when you need to do something that may effect the stcb/asoc. The
12426          * sb is locked however. When data is copied the protocol processing
12427          * should be enabled since this is a slower operation...
12428          */
12429         struct sctp_stream_queue_pending *sp = NULL;
12430         int resv_in_first;
12431
12432         *error = 0;
12433         /* Now can we send this? */
12434         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12435             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12436             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12437             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12438                 /* got data while shutting down */
12439                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12440                 *error = ECONNRESET;
12441                 goto out_now;
12442         }
12443         sctp_alloc_a_strmoq(stcb, sp);
12444         if (sp == NULL) {
12445                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12446                 *error = ENOMEM;
12447                 goto out_now;
12448         }
12449         sp->act_flags = 0;
12450         sp->sender_all_done = 0;
12451         sp->sinfo_flags = srcv->sinfo_flags;
12452         sp->timetolive = srcv->sinfo_timetolive;
12453         sp->ppid = srcv->sinfo_ppid;
12454         sp->context = srcv->sinfo_context;
12455         sp->fsn = 0;
12456         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12457
12458         sp->sid = srcv->sinfo_stream;
12459         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12460         if ((sp->length == (uint32_t)uio->uio_resid) &&
12461             ((user_marks_eor == 0) ||
12462             (srcv->sinfo_flags & SCTP_EOF) ||
12463             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12464                 sp->msg_is_complete = 1;
12465         } else {
12466                 sp->msg_is_complete = 0;
12467         }
12468         sp->sender_all_done = 0;
12469         sp->some_taken = 0;
12470         sp->put_last_out = 0;
12471         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12472         sp->data = sp->tail_mbuf = NULL;
12473         if (sp->length == 0) {
12474                 goto skip_copy;
12475         }
12476         if (srcv->sinfo_keynumber_valid) {
12477                 sp->auth_keyid = srcv->sinfo_keynumber;
12478         } else {
12479                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12480         }
12481         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12482                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12483                 sp->holds_key_ref = 1;
12484         }
12485         *error = sctp_copy_one(sp, uio, resv_in_first);
12486 skip_copy:
12487         if (*error) {
12488                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12489                 sp = NULL;
12490         } else {
12491                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12492                         sp->net = net;
12493                         atomic_add_int(&sp->net->ref_count, 1);
12494                 } else {
12495                         sp->net = NULL;
12496                 }
12497                 sctp_set_prsctp_policy(sp);
12498         }
12499 out_now:
12500         return (sp);
12501 }
12502
12503
12504 int
12505 sctp_sosend(struct socket *so,
12506     struct sockaddr *addr,
12507     struct uio *uio,
12508     struct mbuf *top,
12509     struct mbuf *control,
12510     int flags,
12511     struct thread *p
12512 )
12513 {
12514         int error, use_sndinfo = 0;
12515         struct sctp_sndrcvinfo sndrcvninfo;
12516         struct sockaddr *addr_to_use;
12517 #if defined(INET) && defined(INET6)
12518         struct sockaddr_in sin;
12519 #endif
12520
12521         if (control) {
12522                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12523                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12524                     sizeof(sndrcvninfo))) {
12525                         /* got one */
12526                         use_sndinfo = 1;
12527                 }
12528         }
12529         addr_to_use = addr;
12530 #if defined(INET) && defined(INET6)
12531         if ((addr) && (addr->sa_family == AF_INET6)) {
12532                 struct sockaddr_in6 *sin6;
12533
12534                 sin6 = (struct sockaddr_in6 *)addr;
12535                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12536                         in6_sin6_2_sin(&sin, sin6);
12537                         addr_to_use = (struct sockaddr *)&sin;
12538                 }
12539         }
12540 #endif
12541         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12542             control,
12543             flags,
12544             use_sndinfo ? &sndrcvninfo : NULL
12545             ,p
12546             );
12547         return (error);
12548 }
12549
12550
12551 int
12552 sctp_lower_sosend(struct socket *so,
12553     struct sockaddr *addr,
12554     struct uio *uio,
12555     struct mbuf *i_pak,
12556     struct mbuf *control,
12557     int flags,
12558     struct sctp_sndrcvinfo *srcv
12559     ,
12560     struct thread *p
12561 )
12562 {
12563         ssize_t sndlen = 0, max_len, local_add_more;
12564         int error, len;
12565         struct mbuf *top = NULL;
12566         int queue_only = 0, queue_only_for_init = 0;
12567         int free_cnt_applied = 0;
12568         int un_sent;
12569         int now_filled = 0;
12570         unsigned int inqueue_bytes = 0;
12571         struct sctp_block_entry be;
12572         struct sctp_inpcb *inp;
12573         struct sctp_tcb *stcb = NULL;
12574         struct timeval now;
12575         struct sctp_nets *net;
12576         struct sctp_association *asoc;
12577         struct sctp_inpcb *t_inp;
12578         int user_marks_eor;
12579         int create_lock_applied = 0;
12580         int nagle_applies = 0;
12581         int some_on_control = 0;
12582         int got_all_of_the_send = 0;
12583         int hold_tcblock = 0;
12584         int non_blocking = 0;
12585         ssize_t local_soresv = 0;
12586         uint16_t port;
12587         uint16_t sinfo_flags;
12588         sctp_assoc_t sinfo_assoc_id;
12589
12590         error = 0;
12591         net = NULL;
12592         stcb = NULL;
12593         asoc = NULL;
12594
12595         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12596         if (inp == NULL) {
12597                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12598                 error = EINVAL;
12599                 if (i_pak) {
12600                         SCTP_RELEASE_PKT(i_pak);
12601                 }
12602                 return (error);
12603         }
12604         if ((uio == NULL) && (i_pak == NULL)) {
12605                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                 return (EINVAL);
12607         }
12608         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12609         atomic_add_int(&inp->total_sends, 1);
12610         if (uio) {
12611                 if (uio->uio_resid < 0) {
12612                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12613                         return (EINVAL);
12614                 }
12615                 sndlen = uio->uio_resid;
12616         } else {
12617                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12618                 sndlen = SCTP_HEADER_LEN(i_pak);
12619         }
12620         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zu\n",
12621             (void *)addr,
12622             sndlen);
12623         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12624             SCTP_IS_LISTENING(inp)) {
12625                 /* The listener can NOT send */
12626                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12627                 error = ENOTCONN;
12628                 goto out_unlocked;
12629         }
12630         /**
12631          * Pre-screen address, if one is given the sin-len
12632          * must be set correctly!
12633          */
12634         if (addr) {
12635                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12636
12637                 switch (raddr->sa.sa_family) {
12638 #ifdef INET
12639                 case AF_INET:
12640                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12641                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12642                                 error = EINVAL;
12643                                 goto out_unlocked;
12644                         }
12645                         port = raddr->sin.sin_port;
12646                         break;
12647 #endif
12648 #ifdef INET6
12649                 case AF_INET6:
12650                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12651                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12652                                 error = EINVAL;
12653                                 goto out_unlocked;
12654                         }
12655                         port = raddr->sin6.sin6_port;
12656                         break;
12657 #endif
12658                 default:
12659                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12660                         error = EAFNOSUPPORT;
12661                         goto out_unlocked;
12662                 }
12663         } else
12664                 port = 0;
12665
12666         if (srcv) {
12667                 sinfo_flags = srcv->sinfo_flags;
12668                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12669                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12670                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12671                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12672                         error = EINVAL;
12673                         goto out_unlocked;
12674                 }
12675                 if (srcv->sinfo_flags)
12676                         SCTP_STAT_INCR(sctps_sends_with_flags);
12677         } else {
12678                 sinfo_flags = inp->def_send.sinfo_flags;
12679                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12680         }
12681         if (flags & MSG_EOR) {
12682                 sinfo_flags |= SCTP_EOR;
12683         }
12684         if (flags & MSG_EOF) {
12685                 sinfo_flags |= SCTP_EOF;
12686         }
12687         if (sinfo_flags & SCTP_SENDALL) {
12688                 /* its a sendall */
12689                 error = sctp_sendall(inp, uio, top, srcv);
12690                 top = NULL;
12691                 goto out_unlocked;
12692         }
12693         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12694                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12695                 error = EINVAL;
12696                 goto out_unlocked;
12697         }
12698         /* now we must find the assoc */
12699         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12700             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12701                 SCTP_INP_RLOCK(inp);
12702                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12703                 if (stcb) {
12704                         SCTP_TCB_LOCK(stcb);
12705                         hold_tcblock = 1;
12706                 }
12707                 SCTP_INP_RUNLOCK(inp);
12708         } else if (sinfo_assoc_id) {
12709                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12710                 if (stcb != NULL) {
12711                         hold_tcblock = 1;
12712                 }
12713         } else if (addr) {
12714                 /*-
12715                  * Since we did not use findep we must
12716                  * increment it, and if we don't find a tcb
12717                  * decrement it.
12718                  */
12719                 SCTP_INP_WLOCK(inp);
12720                 SCTP_INP_INCR_REF(inp);
12721                 SCTP_INP_WUNLOCK(inp);
12722                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12723                 if (stcb == NULL) {
12724                         SCTP_INP_WLOCK(inp);
12725                         SCTP_INP_DECR_REF(inp);
12726                         SCTP_INP_WUNLOCK(inp);
12727                 } else {
12728                         hold_tcblock = 1;
12729                 }
12730         }
12731         if ((stcb == NULL) && (addr)) {
12732                 /* Possible implicit send? */
12733                 SCTP_ASOC_CREATE_LOCK(inp);
12734                 create_lock_applied = 1;
12735                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12736                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12737                         /* Should I really unlock ? */
12738                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12739                         error = EINVAL;
12740                         goto out_unlocked;
12741
12742                 }
12743                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12744                     (addr->sa_family == AF_INET6)) {
12745                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12746                         error = EINVAL;
12747                         goto out_unlocked;
12748                 }
12749                 SCTP_INP_WLOCK(inp);
12750                 SCTP_INP_INCR_REF(inp);
12751                 SCTP_INP_WUNLOCK(inp);
12752                 /* With the lock applied look again */
12753                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12754 #if defined(INET) || defined(INET6)
12755                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12756                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12757                 }
12758 #endif
12759                 if (stcb == NULL) {
12760                         SCTP_INP_WLOCK(inp);
12761                         SCTP_INP_DECR_REF(inp);
12762                         SCTP_INP_WUNLOCK(inp);
12763                 } else {
12764                         hold_tcblock = 1;
12765                 }
12766                 if (error) {
12767                         goto out_unlocked;
12768                 }
12769                 if (t_inp != inp) {
12770                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12771                         error = ENOTCONN;
12772                         goto out_unlocked;
12773                 }
12774         }
12775         if (stcb == NULL) {
12776                 if (addr == NULL) {
12777                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12778                         error = ENOENT;
12779                         goto out_unlocked;
12780                 } else {
12781                         /* We must go ahead and start the INIT process */
12782                         uint32_t vrf_id;
12783
12784                         if ((sinfo_flags & SCTP_ABORT) ||
12785                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12786                                 /*-
12787                                  * User asks to abort a non-existant assoc,
12788                                  * or EOF a non-existant assoc with no data
12789                                  */
12790                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12791                                 error = ENOENT;
12792                                 goto out_unlocked;
12793                         }
12794                         /* get an asoc/stcb struct */
12795                         vrf_id = inp->def_vrf_id;
12796 #ifdef INVARIANTS
12797                         if (create_lock_applied == 0) {
12798                                 panic("Error, should hold create lock and I don't?");
12799                         }
12800 #endif
12801                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12802                             inp->sctp_ep.pre_open_stream_count,
12803                             inp->sctp_ep.port,
12804                             p,
12805                             SCTP_INITIALIZE_AUTH_PARAMS);
12806                         if (stcb == NULL) {
12807                                 /* Error is setup for us in the call */
12808                                 goto out_unlocked;
12809                         }
12810                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12811                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12812                                 /*
12813                                  * Set the connected flag so we can queue
12814                                  * data
12815                                  */
12816                                 soisconnecting(so);
12817                         }
12818                         hold_tcblock = 1;
12819                         if (create_lock_applied) {
12820                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12821                                 create_lock_applied = 0;
12822                         } else {
12823                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12824                         }
12825                         /*
12826                          * Turn on queue only flag to prevent data from
12827                          * being sent
12828                          */
12829                         queue_only = 1;
12830                         asoc = &stcb->asoc;
12831                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12832                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12833
12834                         if (control) {
12835                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12836                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12837                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12838                                         hold_tcblock = 0;
12839                                         stcb = NULL;
12840                                         goto out_unlocked;
12841                                 }
12842                         }
12843                         /* out with the INIT */
12844                         queue_only_for_init = 1;
12845                         /*-
12846                          * we may want to dig in after this call and adjust the MTU
12847                          * value. It defaulted to 1500 (constant) but the ro
12848                          * structure may now have an update and thus we may need to
12849                          * change it BEFORE we append the message.
12850                          */
12851                 }
12852         } else
12853                 asoc = &stcb->asoc;
12854         if (srcv == NULL) {
12855                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12856                 sinfo_flags = srcv->sinfo_flags;
12857                 if (flags & MSG_EOR) {
12858                         sinfo_flags |= SCTP_EOR;
12859                 }
12860                 if (flags & MSG_EOF) {
12861                         sinfo_flags |= SCTP_EOF;
12862                 }
12863         }
12864         if (sinfo_flags & SCTP_ADDR_OVER) {
12865                 if (addr)
12866                         net = sctp_findnet(stcb, addr);
12867                 else
12868                         net = NULL;
12869                 if ((net == NULL) ||
12870                     ((port != 0) && (port != stcb->rport))) {
12871                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12872                         error = EINVAL;
12873                         goto out_unlocked;
12874                 }
12875         } else {
12876                 if (stcb->asoc.alternate) {
12877                         net = stcb->asoc.alternate;
12878                 } else {
12879                         net = stcb->asoc.primary_destination;
12880                 }
12881         }
12882         atomic_add_int(&stcb->total_sends, 1);
12883         /* Keep the stcb from being freed under our feet */
12884         atomic_add_int(&asoc->refcnt, 1);
12885         free_cnt_applied = 1;
12886
12887         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12888                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12889                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12890                         error = EMSGSIZE;
12891                         goto out_unlocked;
12892                 }
12893         }
12894         if (SCTP_SO_IS_NBIO(so)
12895             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12896             ) {
12897                 non_blocking = 1;
12898         }
12899         /* would we block? */
12900         if (non_blocking) {
12901                 ssize_t amount;
12902
12903                 if (hold_tcblock == 0) {
12904                         SCTP_TCB_LOCK(stcb);
12905                         hold_tcblock = 1;
12906                 }
12907                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12908                 if (user_marks_eor == 0) {
12909                         amount = sndlen;
12910                 } else {
12911                         amount = 1;
12912                 }
12913                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12914                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12915                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12916                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12917                                 error = EMSGSIZE;
12918                         else
12919                                 error = EWOULDBLOCK;
12920                         goto out_unlocked;
12921                 }
12922                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12923                 SCTP_TCB_UNLOCK(stcb);
12924                 hold_tcblock = 0;
12925         } else {
12926                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12927         }
12928         local_soresv = sndlen;
12929         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12930                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12931                 error = ECONNRESET;
12932                 goto out_unlocked;
12933         }
12934         if (create_lock_applied) {
12935                 SCTP_ASOC_CREATE_UNLOCK(inp);
12936                 create_lock_applied = 0;
12937         }
12938         /* Is the stream no. valid? */
12939         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12940                 /* Invalid stream number */
12941                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12942                 error = EINVAL;
12943                 goto out_unlocked;
12944         }
12945         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12946             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12947                 /*
12948                  * Can't queue any data while stream reset is underway.
12949                  */
12950                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12951                         error = EAGAIN;
12952                 } else {
12953                         error = EINVAL;
12954                 }
12955                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12956                 goto out_unlocked;
12957         }
12958         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12959             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12960                 queue_only = 1;
12961         }
12962         /* we are now done with all control */
12963         if (control) {
12964                 sctp_m_freem(control);
12965                 control = NULL;
12966         }
12967         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12968             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12969             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12970             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12971                 if (sinfo_flags & SCTP_ABORT) {
12972                         ;
12973                 } else {
12974                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12975                         error = ECONNRESET;
12976                         goto out_unlocked;
12977                 }
12978         }
12979         /* Ok, we will attempt a msgsnd :> */
12980         if (p) {
12981                 p->td_ru.ru_msgsnd++;
12982         }
12983         /* Are we aborting? */
12984         if (sinfo_flags & SCTP_ABORT) {
12985                 struct mbuf *mm;
12986                 ssize_t tot_demand, tot_out = 0, max_out;
12987
12988                 SCTP_STAT_INCR(sctps_sends_with_abort);
12989                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12990                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12991                         /* It has to be up before we abort */
12992                         /* how big is the user initiated abort? */
12993                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12994                         error = EINVAL;
12995                         goto out;
12996                 }
12997                 if (hold_tcblock) {
12998                         SCTP_TCB_UNLOCK(stcb);
12999                         hold_tcblock = 0;
13000                 }
13001                 if (top) {
13002                         struct mbuf *cntm = NULL;
13003
13004                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
13005                         if (sndlen != 0) {
13006                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
13007                                         tot_out += SCTP_BUF_LEN(cntm);
13008                                 }
13009                         }
13010                 } else {
13011                         /* Must fit in a MTU */
13012                         tot_out = sndlen;
13013                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13014                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13015                                 /* To big */
13016                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13017                                 error = EMSGSIZE;
13018                                 goto out;
13019                         }
13020                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
13021                 }
13022                 if (mm == NULL) {
13023                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13024                         error = ENOMEM;
13025                         goto out;
13026                 }
13027                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13028                 max_out -= sizeof(struct sctp_abort_msg);
13029                 if (tot_out > max_out) {
13030                         tot_out = max_out;
13031                 }
13032                 if (mm) {
13033                         struct sctp_paramhdr *ph;
13034
13035                         /* now move forward the data pointer */
13036                         ph = mtod(mm, struct sctp_paramhdr *);
13037                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13038                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
13039                         ph++;
13040                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
13041                         if (top == NULL) {
13042                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13043                                 if (error) {
13044                                         /*-
13045                                          * Here if we can't get his data we
13046                                          * still abort we just don't get to
13047                                          * send the users note :-0
13048                                          */
13049                                         sctp_m_freem(mm);
13050                                         mm = NULL;
13051                                 }
13052                         } else {
13053                                 if (sndlen != 0) {
13054                                         SCTP_BUF_NEXT(mm) = top;
13055                                 }
13056                         }
13057                 }
13058                 if (hold_tcblock == 0) {
13059                         SCTP_TCB_LOCK(stcb);
13060                 }
13061                 atomic_add_int(&stcb->asoc.refcnt, -1);
13062                 free_cnt_applied = 0;
13063                 /* release this lock, otherwise we hang on ourselves */
13064                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13065                 /* now relock the stcb so everything is sane */
13066                 hold_tcblock = 0;
13067                 stcb = NULL;
13068                 /*
13069                  * In this case top is already chained to mm avoid double
13070                  * free, since we free it below if top != NULL and driver
13071                  * would free it after sending the packet out
13072                  */
13073                 if (sndlen != 0) {
13074                         top = NULL;
13075                 }
13076                 goto out_unlocked;
13077         }
13078         /* Calculate the maximum we can send */
13079         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13080         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13081                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13082         } else {
13083                 max_len = 0;
13084         }
13085         if (hold_tcblock) {
13086                 SCTP_TCB_UNLOCK(stcb);
13087                 hold_tcblock = 0;
13088         }
13089         if (asoc->strmout == NULL) {
13090                 /* huh? software error */
13091                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13092                 error = EFAULT;
13093                 goto out_unlocked;
13094         }
13095
13096         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13097         if ((user_marks_eor == 0) &&
13098             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13099                 /* It will NEVER fit */
13100                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13101                 error = EMSGSIZE;
13102                 goto out_unlocked;
13103         }
13104         if ((uio == NULL) && user_marks_eor) {
13105                 /*-
13106                  * We do not support eeor mode for
13107                  * sending with mbuf chains (like sendfile).
13108                  */
13109                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13110                 error = EINVAL;
13111                 goto out_unlocked;
13112         }
13113
13114         if (user_marks_eor) {
13115                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13116         } else {
13117                 /*-
13118                  * For non-eeor the whole message must fit in
13119                  * the socket send buffer.
13120                  */
13121                 local_add_more = sndlen;
13122         }
13123         len = 0;
13124         if (non_blocking) {
13125                 goto skip_preblock;
13126         }
13127         if (((max_len <= local_add_more) &&
13128             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13129             (max_len == 0) ||
13130             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13131                 /* No room right now ! */
13132                 SOCKBUF_LOCK(&so->so_snd);
13133                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13134                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13135                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13136                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13137                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13138                             inqueue_bytes,
13139                             local_add_more,
13140                             stcb->asoc.stream_queue_cnt,
13141                             stcb->asoc.chunks_on_out_queue,
13142                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13143                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13144                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13145                         }
13146                         be.error = 0;
13147                         stcb->block_entry = &be;
13148                         error = sbwait(&so->so_snd);
13149                         stcb->block_entry = NULL;
13150                         if (error || so->so_error || be.error) {
13151                                 if (error == 0) {
13152                                         if (so->so_error)
13153                                                 error = so->so_error;
13154                                         if (be.error) {
13155                                                 error = be.error;
13156                                         }
13157                                 }
13158                                 SOCKBUF_UNLOCK(&so->so_snd);
13159                                 goto out_unlocked;
13160                         }
13161                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13162                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13163                                     asoc, stcb->asoc.total_output_queue_size);
13164                         }
13165                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13166                                 SOCKBUF_UNLOCK(&so->so_snd);
13167                                 goto out_unlocked;
13168                         }
13169                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13170                 }
13171                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13172                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13173                 } else {
13174                         max_len = 0;
13175                 }
13176                 SOCKBUF_UNLOCK(&so->so_snd);
13177         }
13178
13179 skip_preblock:
13180         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13181                 goto out_unlocked;
13182         }
13183         /*
13184          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13185          * case NOTE: uio will be null when top/mbuf is passed
13186          */
13187         if (sndlen == 0) {
13188                 if (sinfo_flags & SCTP_EOF) {
13189                         got_all_of_the_send = 1;
13190                         goto dataless_eof;
13191                 } else {
13192                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13193                         error = EINVAL;
13194                         goto out;
13195                 }
13196         }
13197         if (top == NULL) {
13198                 struct sctp_stream_queue_pending *sp;
13199                 struct sctp_stream_out *strm;
13200                 uint32_t sndout;
13201
13202                 SCTP_TCB_SEND_LOCK(stcb);
13203                 if ((asoc->stream_locked) &&
13204                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13205                         SCTP_TCB_SEND_UNLOCK(stcb);
13206                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13207                         error = EINVAL;
13208                         goto out;
13209                 }
13210                 SCTP_TCB_SEND_UNLOCK(stcb);
13211
13212                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13213                 if (strm->last_msg_incomplete == 0) {
13214         do_a_copy_in:
13215                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13216                         if (error) {
13217                                 goto out;
13218                         }
13219                         SCTP_TCB_SEND_LOCK(stcb);
13220                         if (sp->msg_is_complete) {
13221                                 strm->last_msg_incomplete = 0;
13222                                 asoc->stream_locked = 0;
13223                         } else {
13224                                 /*
13225                                  * Just got locked to this guy in case of an
13226                                  * interrupt.
13227                                  */
13228                                 strm->last_msg_incomplete = 1;
13229                                 if (stcb->asoc.idata_supported == 0) {
13230                                         asoc->stream_locked = 1;
13231                                         asoc->stream_locked_on = srcv->sinfo_stream;
13232                                 }
13233                                 sp->sender_all_done = 0;
13234                         }
13235                         sctp_snd_sb_alloc(stcb, sp->length);
13236                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13237                         if (sinfo_flags & SCTP_UNORDERED) {
13238                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13239                         }
13240                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13241                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13242                         SCTP_TCB_SEND_UNLOCK(stcb);
13243                 } else {
13244                         SCTP_TCB_SEND_LOCK(stcb);
13245                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13246                         SCTP_TCB_SEND_UNLOCK(stcb);
13247                         if (sp == NULL) {
13248                                 /* ???? Huh ??? last msg is gone */
13249 #ifdef INVARIANTS
13250                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13251 #else
13252                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13253                                 strm->last_msg_incomplete = 0;
13254 #endif
13255                                 goto do_a_copy_in;
13256
13257                         }
13258                 }
13259                 while (uio->uio_resid > 0) {
13260                         /* How much room do we have? */
13261                         struct mbuf *new_tail, *mm;
13262
13263                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13264                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13265                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13266                         else
13267                                 max_len = 0;
13268
13269                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13270                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13271                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13272                                 sndout = 0;
13273                                 new_tail = NULL;
13274                                 if (hold_tcblock) {
13275                                         SCTP_TCB_UNLOCK(stcb);
13276                                         hold_tcblock = 0;
13277                                 }
13278                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13279                                 if ((mm == NULL) || error) {
13280                                         if (mm) {
13281                                                 sctp_m_freem(mm);
13282                                         }
13283                                         goto out;
13284                                 }
13285                                 /* Update the mbuf and count */
13286                                 SCTP_TCB_SEND_LOCK(stcb);
13287                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13288                                         /*
13289                                          * we need to get out. Peer probably
13290                                          * aborted.
13291                                          */
13292                                         sctp_m_freem(mm);
13293                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13294                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13295                                                 error = ECONNRESET;
13296                                         }
13297                                         SCTP_TCB_SEND_UNLOCK(stcb);
13298                                         goto out;
13299                                 }
13300                                 if (sp->tail_mbuf) {
13301                                         /* tack it to the end */
13302                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13303                                         sp->tail_mbuf = new_tail;
13304                                 } else {
13305                                         /* A stolen mbuf */
13306                                         sp->data = mm;
13307                                         sp->tail_mbuf = new_tail;
13308                                 }
13309                                 sctp_snd_sb_alloc(stcb, sndout);
13310                                 atomic_add_int(&sp->length, sndout);
13311                                 len += sndout;
13312                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13313                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13314                                 }
13315
13316                                 /* Did we reach EOR? */
13317                                 if ((uio->uio_resid == 0) &&
13318                                     ((user_marks_eor == 0) ||
13319                                     (sinfo_flags & SCTP_EOF) ||
13320                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13321                                         sp->msg_is_complete = 1;
13322                                 } else {
13323                                         sp->msg_is_complete = 0;
13324                                 }
13325                                 SCTP_TCB_SEND_UNLOCK(stcb);
13326                         }
13327                         if (uio->uio_resid == 0) {
13328                                 /* got it all? */
13329                                 continue;
13330                         }
13331                         /* PR-SCTP? */
13332                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13333                                 /*
13334                                  * This is ugly but we must assure locking
13335                                  * order
13336                                  */
13337                                 if (hold_tcblock == 0) {
13338                                         SCTP_TCB_LOCK(stcb);
13339                                         hold_tcblock = 1;
13340                                 }
13341                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13342                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13343                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13344                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13345                                 else
13346                                         max_len = 0;
13347                                 if (max_len > 0) {
13348                                         continue;
13349                                 }
13350                                 SCTP_TCB_UNLOCK(stcb);
13351                                 hold_tcblock = 0;
13352                         }
13353                         /* wait for space now */
13354                         if (non_blocking) {
13355                                 /* Non-blocking io in place out */
13356                                 goto skip_out_eof;
13357                         }
13358                         /* What about the INIT, send it maybe */
13359                         if (queue_only_for_init) {
13360                                 if (hold_tcblock == 0) {
13361                                         SCTP_TCB_LOCK(stcb);
13362                                         hold_tcblock = 1;
13363                                 }
13364                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13365                                         /* a collision took us forward? */
13366                                         queue_only = 0;
13367                                 } else {
13368                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13369                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13370                                         queue_only = 1;
13371                                 }
13372                         }
13373                         if ((net->flight_size > net->cwnd) &&
13374                             (asoc->sctp_cmt_on_off == 0)) {
13375                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13376                                 queue_only = 1;
13377                         } else if (asoc->ifp_had_enobuf) {
13378                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13379                                 if (net->flight_size > (2 * net->mtu)) {
13380                                         queue_only = 1;
13381                                 }
13382                                 asoc->ifp_had_enobuf = 0;
13383                         }
13384                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13385                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13386                             (stcb->asoc.total_flight > 0) &&
13387                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13388                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13389
13390                                 /*-
13391                                  * Ok, Nagle is set on and we have data outstanding.
13392                                  * Don't send anything and let SACKs drive out the
13393                                  * data unless we have a "full" segment to send.
13394                                  */
13395                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13396                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13397                                 }
13398                                 SCTP_STAT_INCR(sctps_naglequeued);
13399                                 nagle_applies = 1;
13400                         } else {
13401                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13402                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13403                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13404                                 }
13405                                 SCTP_STAT_INCR(sctps_naglesent);
13406                                 nagle_applies = 0;
13407                         }
13408                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13409
13410                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13411                                     nagle_applies, un_sent);
13412                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13413                                     stcb->asoc.total_flight,
13414                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13415                         }
13416                         if (queue_only_for_init)
13417                                 queue_only_for_init = 0;
13418                         if ((queue_only == 0) && (nagle_applies == 0)) {
13419                                 /*-
13420                                  * need to start chunk output
13421                                  * before blocking.. note that if
13422                                  * a lock is already applied, then
13423                                  * the input via the net is happening
13424                                  * and I don't need to start output :-D
13425                                  */
13426                                 if (hold_tcblock == 0) {
13427                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13428                                                 hold_tcblock = 1;
13429                                                 sctp_chunk_output(inp,
13430                                                     stcb,
13431                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13432                                         }
13433                                 } else {
13434                                         sctp_chunk_output(inp,
13435                                             stcb,
13436                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13437                                 }
13438                         }
13439                         if (hold_tcblock == 1) {
13440                                 SCTP_TCB_UNLOCK(stcb);
13441                                 hold_tcblock = 0;
13442                         }
13443                         SOCKBUF_LOCK(&so->so_snd);
13444                         /*-
13445                          * This is a bit strange, but I think it will
13446                          * work. The total_output_queue_size is locked and
13447                          * protected by the TCB_LOCK, which we just released.
13448                          * There is a race that can occur between releasing it
13449                          * above, and me getting the socket lock, where sacks
13450                          * come in but we have not put the SB_WAIT on the
13451                          * so_snd buffer to get the wakeup. After the LOCK
13452                          * is applied the sack_processing will also need to
13453                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13454                          * once we have the socket buffer lock if we recheck the
13455                          * size we KNOW we will get to sleep safely with the
13456                          * wakeup flag in place.
13457                          */
13458                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13459                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13460                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13461                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13462                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13463                                             asoc, uio->uio_resid);
13464                                 }
13465                                 be.error = 0;
13466                                 stcb->block_entry = &be;
13467                                 error = sbwait(&so->so_snd);
13468                                 stcb->block_entry = NULL;
13469
13470                                 if (error || so->so_error || be.error) {
13471                                         if (error == 0) {
13472                                                 if (so->so_error)
13473                                                         error = so->so_error;
13474                                                 if (be.error) {
13475                                                         error = be.error;
13476                                                 }
13477                                         }
13478                                         SOCKBUF_UNLOCK(&so->so_snd);
13479                                         goto out_unlocked;
13480                                 }
13481
13482                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13483                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13484                                             asoc, stcb->asoc.total_output_queue_size);
13485                                 }
13486                         }
13487                         SOCKBUF_UNLOCK(&so->so_snd);
13488                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13489                                 goto out_unlocked;
13490                         }
13491                 }
13492                 SCTP_TCB_SEND_LOCK(stcb);
13493                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13494                         SCTP_TCB_SEND_UNLOCK(stcb);
13495                         goto out_unlocked;
13496                 }
13497                 if (sp) {
13498                         if (sp->msg_is_complete == 0) {
13499                                 strm->last_msg_incomplete = 1;
13500                                 if (stcb->asoc.idata_supported == 0) {
13501                                         asoc->stream_locked = 1;
13502                                         asoc->stream_locked_on = srcv->sinfo_stream;
13503                                 }
13504                         } else {
13505                                 sp->sender_all_done = 1;
13506                                 strm->last_msg_incomplete = 0;
13507                                 asoc->stream_locked = 0;
13508                         }
13509                 } else {
13510                         SCTP_PRINTF("Huh no sp TSNH?\n");
13511                         strm->last_msg_incomplete = 0;
13512                         asoc->stream_locked = 0;
13513                 }
13514                 SCTP_TCB_SEND_UNLOCK(stcb);
13515                 if (uio->uio_resid == 0) {
13516                         got_all_of_the_send = 1;
13517                 }
13518         } else {
13519                 /* We send in a 0, since we do NOT have any locks */
13520                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13521                 top = NULL;
13522                 if (sinfo_flags & SCTP_EOF) {
13523                         /*
13524                          * This should only happen for Panda for the mbuf
13525                          * send case, which does NOT yet support EEOR mode.
13526                          * Thus, we can just set this flag to do the proper
13527                          * EOF handling.
13528                          */
13529                         got_all_of_the_send = 1;
13530                 }
13531         }
13532         if (error) {
13533                 goto out;
13534         }
13535 dataless_eof:
13536         /* EOF thing ? */
13537         if ((sinfo_flags & SCTP_EOF) &&
13538             (got_all_of_the_send == 1)) {
13539                 SCTP_STAT_INCR(sctps_sends_with_eof);
13540                 error = 0;
13541                 if (hold_tcblock == 0) {
13542                         SCTP_TCB_LOCK(stcb);
13543                         hold_tcblock = 1;
13544                 }
13545                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13546                     TAILQ_EMPTY(&asoc->sent_queue) &&
13547                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13548                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13549                                 goto abort_anyway;
13550                         }
13551                         /* there is nothing queued to send, so I'm done... */
13552                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13553                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13554                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13555                                 struct sctp_nets *netp;
13556
13557                                 /* only send SHUTDOWN the first time through */
13558                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13559                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13560                                 }
13561                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13562                                 sctp_stop_timers_for_shutdown(stcb);
13563                                 if (stcb->asoc.alternate) {
13564                                         netp = stcb->asoc.alternate;
13565                                 } else {
13566                                         netp = stcb->asoc.primary_destination;
13567                                 }
13568                                 sctp_send_shutdown(stcb, netp);
13569                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13570                                     netp);
13571                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13572                                     asoc->primary_destination);
13573                         }
13574                 } else {
13575                         /*-
13576                          * we still got (or just got) data to send, so set
13577                          * SHUTDOWN_PENDING
13578                          */
13579                         /*-
13580                          * XXX sockets draft says that SCTP_EOF should be
13581                          * sent with no data.  currently, we will allow user
13582                          * data to be sent first and move to
13583                          * SHUTDOWN-PENDING
13584                          */
13585                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13586                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13587                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13588                                 if (hold_tcblock == 0) {
13589                                         SCTP_TCB_LOCK(stcb);
13590                                         hold_tcblock = 1;
13591                                 }
13592                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13593                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13594                                 }
13595                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13596                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13597                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13598                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13599                                         struct mbuf *op_err;
13600                                         char msg[SCTP_DIAG_INFO_LEN];
13601
13602                         abort_anyway:
13603                                         if (free_cnt_applied) {
13604                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13605                                                 free_cnt_applied = 0;
13606                                         }
13607                                         snprintf(msg, sizeof(msg),
13608                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13609                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13610                                             msg);
13611                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13612                                             op_err, SCTP_SO_LOCKED);
13613                                         /*
13614                                          * now relock the stcb so everything
13615                                          * is sane
13616                                          */
13617                                         hold_tcblock = 0;
13618                                         stcb = NULL;
13619                                         goto out;
13620                                 }
13621                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13622                                     asoc->primary_destination);
13623                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13624                         }
13625                 }
13626         }
13627 skip_out_eof:
13628         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13629                 some_on_control = 1;
13630         }
13631         if (queue_only_for_init) {
13632                 if (hold_tcblock == 0) {
13633                         SCTP_TCB_LOCK(stcb);
13634                         hold_tcblock = 1;
13635                 }
13636                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13637                         /* a collision took us forward? */
13638                         queue_only = 0;
13639                 } else {
13640                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13641                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13642                         queue_only = 1;
13643                 }
13644         }
13645         if ((net->flight_size > net->cwnd) &&
13646             (stcb->asoc.sctp_cmt_on_off == 0)) {
13647                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13648                 queue_only = 1;
13649         } else if (asoc->ifp_had_enobuf) {
13650                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13651                 if (net->flight_size > (2 * net->mtu)) {
13652                         queue_only = 1;
13653                 }
13654                 asoc->ifp_had_enobuf = 0;
13655         }
13656         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13657         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13658             (stcb->asoc.total_flight > 0) &&
13659             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13660             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13661                 /*-
13662                  * Ok, Nagle is set on and we have data outstanding.
13663                  * Don't send anything and let SACKs drive out the
13664                  * data unless wen have a "full" segment to send.
13665                  */
13666                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13667                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13668                 }
13669                 SCTP_STAT_INCR(sctps_naglequeued);
13670                 nagle_applies = 1;
13671         } else {
13672                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13673                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13674                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13675                 }
13676                 SCTP_STAT_INCR(sctps_naglesent);
13677                 nagle_applies = 0;
13678         }
13679         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13680                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13681                     nagle_applies, un_sent);
13682                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13683                     stcb->asoc.total_flight,
13684                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13685         }
13686         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13687                 /* we can attempt to send too. */
13688                 if (hold_tcblock == 0) {
13689                         /*
13690                          * If there is activity recv'ing sacks no need to
13691                          * send
13692                          */
13693                         if (SCTP_TCB_TRYLOCK(stcb)) {
13694                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13695                                 hold_tcblock = 1;
13696                         }
13697                 } else {
13698                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13699                 }
13700         } else if ((queue_only == 0) &&
13701                     (stcb->asoc.peers_rwnd == 0) &&
13702             (stcb->asoc.total_flight == 0)) {
13703                 /* We get to have a probe outstanding */
13704                 if (hold_tcblock == 0) {
13705                         hold_tcblock = 1;
13706                         SCTP_TCB_LOCK(stcb);
13707                 }
13708                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13709         } else if (some_on_control) {
13710                 int num_out, reason, frag_point;
13711
13712                 /* Here we do control only */
13713                 if (hold_tcblock == 0) {
13714                         hold_tcblock = 1;
13715                         SCTP_TCB_LOCK(stcb);
13716                 }
13717                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13718                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13719                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13720         }
13721         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13722             queue_only, stcb->asoc.peers_rwnd, un_sent,
13723             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13724             stcb->asoc.total_output_queue_size, error);
13725
13726 out:
13727 out_unlocked:
13728
13729         if (local_soresv && stcb) {
13730                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13731         }
13732         if (create_lock_applied) {
13733                 SCTP_ASOC_CREATE_UNLOCK(inp);
13734         }
13735         if ((stcb) && hold_tcblock) {
13736                 SCTP_TCB_UNLOCK(stcb);
13737         }
13738         if (stcb && free_cnt_applied) {
13739                 atomic_add_int(&stcb->asoc.refcnt, -1);
13740         }
13741 #ifdef INVARIANTS
13742         if (stcb) {
13743                 if (mtx_owned(&stcb->tcb_mtx)) {
13744                         panic("Leaving with tcb mtx owned?");
13745                 }
13746                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13747                         panic("Leaving with tcb send mtx owned?");
13748                 }
13749         }
13750 #endif
13751         if (top) {
13752                 sctp_m_freem(top);
13753         }
13754         if (control) {
13755                 sctp_m_freem(control);
13756         }
13757         return (error);
13758 }
13759
13760
13761 /*
13762  * generate an AUTHentication chunk, if required
13763  */
13764 struct mbuf *
13765 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13766     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13767     struct sctp_tcb *stcb, uint8_t chunk)
13768 {
13769         struct mbuf *m_auth;
13770         struct sctp_auth_chunk *auth;
13771         int chunk_len;
13772         struct mbuf *cn;
13773
13774         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13775             (stcb == NULL))
13776                 return (m);
13777
13778         if (stcb->asoc.auth_supported == 0) {
13779                 return (m);
13780         }
13781         /* does the requested chunk require auth? */
13782         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13783                 return (m);
13784         }
13785         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13786         if (m_auth == NULL) {
13787                 /* no mbuf's */
13788                 return (m);
13789         }
13790         /* reserve some space if this will be the first mbuf */
13791         if (m == NULL)
13792                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13793         /* fill in the AUTH chunk details */
13794         auth = mtod(m_auth, struct sctp_auth_chunk *);
13795         memset(auth, 0, sizeof(*auth));
13796         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13797         auth->ch.chunk_flags = 0;
13798         chunk_len = sizeof(*auth) +
13799             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13800         auth->ch.chunk_length = htons(chunk_len);
13801         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13802         /* key id and hmac digest will be computed and filled in upon send */
13803
13804         /* save the offset where the auth was inserted into the chain */
13805         *offset = 0;
13806         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13807                 *offset += SCTP_BUF_LEN(cn);
13808         }
13809
13810         /* update length and return pointer to the auth chunk */
13811         SCTP_BUF_LEN(m_auth) = chunk_len;
13812         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13813         if (auth_ret != NULL)
13814                 *auth_ret = auth;
13815
13816         return (m);
13817 }
13818
13819 #ifdef INET6
13820 int
13821 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13822 {
13823         struct nd_prefix *pfx = NULL;
13824         struct nd_pfxrouter *pfxrtr = NULL;
13825         struct sockaddr_in6 gw6;
13826
13827         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13828                 return (0);
13829
13830         /* get prefix entry of address */
13831         ND6_RLOCK();
13832         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13833                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13834                         continue;
13835                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13836                     &src6->sin6_addr, &pfx->ndpr_mask))
13837                         break;
13838         }
13839         /* no prefix entry in the prefix list */
13840         if (pfx == NULL) {
13841                 ND6_RUNLOCK();
13842                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13843                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13844                 return (0);
13845         }
13846
13847         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13848         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13849
13850         /* search installed gateway from prefix entry */
13851         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13852                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13853                 gw6.sin6_family = AF_INET6;
13854                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13855                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13856                     sizeof(struct in6_addr));
13857                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13858                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13859                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13860                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13861                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13862                         ND6_RUNLOCK();
13863                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13864                         return (1);
13865                 }
13866         }
13867         ND6_RUNLOCK();
13868         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13869         return (0);
13870 }
13871 #endif
13872
13873 int
13874 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13875 {
13876 #ifdef INET
13877         struct sockaddr_in *sin, *mask;
13878         struct ifaddr *ifa;
13879         struct in_addr srcnetaddr, gwnetaddr;
13880
13881         if (ro == NULL || ro->ro_rt == NULL ||
13882             sifa->address.sa.sa_family != AF_INET) {
13883                 return (0);
13884         }
13885         ifa = (struct ifaddr *)sifa->ifa;
13886         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13887         sin = &sifa->address.sin;
13888         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13889         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13890         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13891         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13892
13893         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13894         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13895         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13896         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13897         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13898         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13899                 return (1);
13900         }
13901 #endif
13902         return (0);
13903 }