sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #if defined(INET) || defined(INET6)
  56 #include <netinet/udp.h>
  57 #endif
  58 #include <netinet/udp_var.h>
  59 #include <machine/in_cksum.h>
  60 #include <netinet/in_kdtrace.h>
  61
  62
  63
  64 #define SCTP_MAX_GAPS_INARRAY 4
  65 struct sack_track {
  66         uint8_t right_edge;     /* mergable on the right edge */
  67         uint8_t left_edge;      /* mergable on the left edge */
  68         uint8_t num_entries;
  69         uint8_t spare;
  70         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  71 };
  72
  73 const struct sack_track sack_array[256] = {
  74         {0, 0, 0, 0,            /* 0x00 */
  75                 {{0, 0},
  76                 {0, 0},
  77                 {0, 0},
  78                 {0, 0}
  79                 }
  80         },
  81         {1, 0, 1, 0,            /* 0x01 */
  82                 {{0, 0},
  83                 {0, 0},
  84                 {0, 0},
  85                 {0, 0}
  86                 }
  87         },
  88         {0, 0, 1, 0,            /* 0x02 */
  89                 {{1, 1},
  90                 {0, 0},
  91                 {0, 0},
  92                 {0, 0}
  93                 }
  94         },
  95         {1, 0, 1, 0,            /* 0x03 */
  96                 {{0, 1},
  97                 {0, 0},
  98                 {0, 0},
  99                 {0, 0}
 100                 }
 101         },
 102         {0, 0, 1, 0,            /* 0x04 */
 103                 {{2, 2},
 104                 {0, 0},
 105                 {0, 0},
 106                 {0, 0}
 107                 }
 108         },
 109         {1, 0, 2, 0,            /* 0x05 */
 110                 {{0, 0},
 111                 {2, 2},
 112                 {0, 0},
 113                 {0, 0}
 114                 }
 115         },
 116         {0, 0, 1, 0,            /* 0x06 */
 117                 {{1, 2},
 118                 {0, 0},
 119                 {0, 0},
 120                 {0, 0}
 121                 }
 122         },
 123         {1, 0, 1, 0,            /* 0x07 */
 124                 {{0, 2},
 125                 {0, 0},
 126                 {0, 0},
 127                 {0, 0}
 128                 }
 129         },
 130         {0, 0, 1, 0,            /* 0x08 */
 131                 {{3, 3},
 132                 {0, 0},
 133                 {0, 0},
 134                 {0, 0}
 135                 }
 136         },
 137         {1, 0, 2, 0,            /* 0x09 */
 138                 {{0, 0},
 139                 {3, 3},
 140                 {0, 0},
 141                 {0, 0}
 142                 }
 143         },
 144         {0, 0, 2, 0,            /* 0x0a */
 145                 {{1, 1},
 146                 {3, 3},
 147                 {0, 0},
 148                 {0, 0}
 149                 }
 150         },
 151         {1, 0, 2, 0,            /* 0x0b */
 152                 {{0, 1},
 153                 {3, 3},
 154                 {0, 0},
 155                 {0, 0}
 156                 }
 157         },
 158         {0, 0, 1, 0,            /* 0x0c */
 159                 {{2, 3},
 160                 {0, 0},
 161                 {0, 0},
 162                 {0, 0}
 163                 }
 164         },
 165         {1, 0, 2, 0,            /* 0x0d */
 166                 {{0, 0},
 167                 {2, 3},
 168                 {0, 0},
 169                 {0, 0}
 170                 }
 171         },
 172         {0, 0, 1, 0,            /* 0x0e */
 173                 {{1, 3},
 174                 {0, 0},
 175                 {0, 0},
 176                 {0, 0}
 177                 }
 178         },
 179         {1, 0, 1, 0,            /* 0x0f */
 180                 {{0, 3},
 181                 {0, 0},
 182                 {0, 0},
 183                 {0, 0}
 184                 }
 185         },
 186         {0, 0, 1, 0,            /* 0x10 */
 187                 {{4, 4},
 188                 {0, 0},
 189                 {0, 0},
 190                 {0, 0}
 191                 }
 192         },
 193         {1, 0, 2, 0,            /* 0x11 */
 194                 {{0, 0},
 195                 {4, 4},
 196                 {0, 0},
 197                 {0, 0}
 198                 }
 199         },
 200         {0, 0, 2, 0,            /* 0x12 */
 201                 {{1, 1},
 202                 {4, 4},
 203                 {0, 0},
 204                 {0, 0}
 205                 }
 206         },
 207         {1, 0, 2, 0,            /* 0x13 */
 208                 {{0, 1},
 209                 {4, 4},
 210                 {0, 0},
 211                 {0, 0}
 212                 }
 213         },
 214         {0, 0, 2, 0,            /* 0x14 */
 215                 {{2, 2},
 216                 {4, 4},
 217                 {0, 0},
 218                 {0, 0}
 219                 }
 220         },
 221         {1, 0, 3, 0,            /* 0x15 */
 222                 {{0, 0},
 223                 {2, 2},
 224                 {4, 4},
 225                 {0, 0}
 226                 }
 227         },
 228         {0, 0, 2, 0,            /* 0x16 */
 229                 {{1, 2},
 230                 {4, 4},
 231                 {0, 0},
 232                 {0, 0}
 233                 }
 234         },
 235         {1, 0, 2, 0,            /* 0x17 */
 236                 {{0, 2},
 237                 {4, 4},
 238                 {0, 0},
 239                 {0, 0}
 240                 }
 241         },
 242         {0, 0, 1, 0,            /* 0x18 */
 243                 {{3, 4},
 244                 {0, 0},
 245                 {0, 0},
 246                 {0, 0}
 247                 }
 248         },
 249         {1, 0, 2, 0,            /* 0x19 */
 250                 {{0, 0},
 251                 {3, 4},
 252                 {0, 0},
 253                 {0, 0}
 254                 }
 255         },
 256         {0, 0, 2, 0,            /* 0x1a */
 257                 {{1, 1},
 258                 {3, 4},
 259                 {0, 0},
 260                 {0, 0}
 261                 }
 262         },
 263         {1, 0, 2, 0,            /* 0x1b */
 264                 {{0, 1},
 265                 {3, 4},
 266                 {0, 0},
 267                 {0, 0}
 268                 }
 269         },
 270         {0, 0, 1, 0,            /* 0x1c */
 271                 {{2, 4},
 272                 {0, 0},
 273                 {0, 0},
 274                 {0, 0}
 275                 }
 276         },
 277         {1, 0, 2, 0,            /* 0x1d */
 278                 {{0, 0},
 279                 {2, 4},
 280                 {0, 0},
 281                 {0, 0}
 282                 }
 283         },
 284         {0, 0, 1, 0,            /* 0x1e */
 285                 {{1, 4},
 286                 {0, 0},
 287                 {0, 0},
 288                 {0, 0}
 289                 }
 290         },
 291         {1, 0, 1, 0,            /* 0x1f */
 292                 {{0, 4},
 293                 {0, 0},
 294                 {0, 0},
 295                 {0, 0}
 296                 }
 297         },
 298         {0, 0, 1, 0,            /* 0x20 */
 299                 {{5, 5},
 300                 {0, 0},
 301                 {0, 0},
 302                 {0, 0}
 303                 }
 304         },
 305         {1, 0, 2, 0,            /* 0x21 */
 306                 {{0, 0},
 307                 {5, 5},
 308                 {0, 0},
 309                 {0, 0}
 310                 }
 311         },
 312         {0, 0, 2, 0,            /* 0x22 */
 313                 {{1, 1},
 314                 {5, 5},
 315                 {0, 0},
 316                 {0, 0}
 317                 }
 318         },
 319         {1, 0, 2, 0,            /* 0x23 */
 320                 {{0, 1},
 321                 {5, 5},
 322                 {0, 0},
 323                 {0, 0}
 324                 }
 325         },
 326         {0, 0, 2, 0,            /* 0x24 */
 327                 {{2, 2},
 328                 {5, 5},
 329                 {0, 0},
 330                 {0, 0}
 331                 }
 332         },
 333         {1, 0, 3, 0,            /* 0x25 */
 334                 {{0, 0},
 335                 {2, 2},
 336                 {5, 5},
 337                 {0, 0}
 338                 }
 339         },
 340         {0, 0, 2, 0,            /* 0x26 */
 341                 {{1, 2},
 342                 {5, 5},
 343                 {0, 0},
 344                 {0, 0}
 345                 }
 346         },
 347         {1, 0, 2, 0,            /* 0x27 */
 348                 {{0, 2},
 349                 {5, 5},
 350                 {0, 0},
 351                 {0, 0}
 352                 }
 353         },
 354         {0, 0, 2, 0,            /* 0x28 */
 355                 {{3, 3},
 356                 {5, 5},
 357                 {0, 0},
 358                 {0, 0}
 359                 }
 360         },
 361         {1, 0, 3, 0,            /* 0x29 */
 362                 {{0, 0},
 363                 {3, 3},
 364                 {5, 5},
 365                 {0, 0}
 366                 }
 367         },
 368         {0, 0, 3, 0,            /* 0x2a */
 369                 {{1, 1},
 370                 {3, 3},
 371                 {5, 5},
 372                 {0, 0}
 373                 }
 374         },
 375         {1, 0, 3, 0,            /* 0x2b */
 376                 {{0, 1},
 377                 {3, 3},
 378                 {5, 5},
 379                 {0, 0}
 380                 }
 381         },
 382         {0, 0, 2, 0,            /* 0x2c */
 383                 {{2, 3},
 384                 {5, 5},
 385                 {0, 0},
 386                 {0, 0}
 387                 }
 388         },
 389         {1, 0, 3, 0,            /* 0x2d */
 390                 {{0, 0},
 391                 {2, 3},
 392                 {5, 5},
 393                 {0, 0}
 394                 }
 395         },
 396         {0, 0, 2, 0,            /* 0x2e */
 397                 {{1, 3},
 398                 {5, 5},
 399                 {0, 0},
 400                 {0, 0}
 401                 }
 402         },
 403         {1, 0, 2, 0,            /* 0x2f */
 404                 {{0, 3},
 405                 {5, 5},
 406                 {0, 0},
 407                 {0, 0}
 408                 }
 409         },
 410         {0, 0, 1, 0,            /* 0x30 */
 411                 {{4, 5},
 412                 {0, 0},
 413                 {0, 0},
 414                 {0, 0}
 415                 }
 416         },
 417         {1, 0, 2, 0,            /* 0x31 */
 418                 {{0, 0},
 419                 {4, 5},
 420                 {0, 0},
 421                 {0, 0}
 422                 }
 423         },
 424         {0, 0, 2, 0,            /* 0x32 */
 425                 {{1, 1},
 426                 {4, 5},
 427                 {0, 0},
 428                 {0, 0}
 429                 }
 430         },
 431         {1, 0, 2, 0,            /* 0x33 */
 432                 {{0, 1},
 433                 {4, 5},
 434                 {0, 0},
 435                 {0, 0}
 436                 }
 437         },
 438         {0, 0, 2, 0,            /* 0x34 */
 439                 {{2, 2},
 440                 {4, 5},
 441                 {0, 0},
 442                 {0, 0}
 443                 }
 444         },
 445         {1, 0, 3, 0,            /* 0x35 */
 446                 {{0, 0},
 447                 {2, 2},
 448                 {4, 5},
 449                 {0, 0}
 450                 }
 451         },
 452         {0, 0, 2, 0,            /* 0x36 */
 453                 {{1, 2},
 454                 {4, 5},
 455                 {0, 0},
 456                 {0, 0}
 457                 }
 458         },
 459         {1, 0, 2, 0,            /* 0x37 */
 460                 {{0, 2},
 461                 {4, 5},
 462                 {0, 0},
 463                 {0, 0}
 464                 }
 465         },
 466         {0, 0, 1, 0,            /* 0x38 */
 467                 {{3, 5},
 468                 {0, 0},
 469                 {0, 0},
 470                 {0, 0}
 471                 }
 472         },
 473         {1, 0, 2, 0,            /* 0x39 */
 474                 {{0, 0},
 475                 {3, 5},
 476                 {0, 0},
 477                 {0, 0}
 478                 }
 479         },
 480         {0, 0, 2, 0,            /* 0x3a */
 481                 {{1, 1},
 482                 {3, 5},
 483                 {0, 0},
 484                 {0, 0}
 485                 }
 486         },
 487         {1, 0, 2, 0,            /* 0x3b */
 488                 {{0, 1},
 489                 {3, 5},
 490                 {0, 0},
 491                 {0, 0}
 492                 }
 493         },
 494         {0, 0, 1, 0,            /* 0x3c */
 495                 {{2, 5},
 496                 {0, 0},
 497                 {0, 0},
 498                 {0, 0}
 499                 }
 500         },
 501         {1, 0, 2, 0,            /* 0x3d */
 502                 {{0, 0},
 503                 {2, 5},
 504                 {0, 0},
 505                 {0, 0}
 506                 }
 507         },
 508         {0, 0, 1, 0,            /* 0x3e */
 509                 {{1, 5},
 510                 {0, 0},
 511                 {0, 0},
 512                 {0, 0}
 513                 }
 514         },
 515         {1, 0, 1, 0,            /* 0x3f */
 516                 {{0, 5},
 517                 {0, 0},
 518                 {0, 0},
 519                 {0, 0}
 520                 }
 521         },
 522         {0, 0, 1, 0,            /* 0x40 */
 523                 {{6, 6},
 524                 {0, 0},
 525                 {0, 0},
 526                 {0, 0}
 527                 }
 528         },
 529         {1, 0, 2, 0,            /* 0x41 */
 530                 {{0, 0},
 531                 {6, 6},
 532                 {0, 0},
 533                 {0, 0}
 534                 }
 535         },
 536         {0, 0, 2, 0,            /* 0x42 */
 537                 {{1, 1},
 538                 {6, 6},
 539                 {0, 0},
 540                 {0, 0}
 541                 }
 542         },
 543         {1, 0, 2, 0,            /* 0x43 */
 544                 {{0, 1},
 545                 {6, 6},
 546                 {0, 0},
 547                 {0, 0}
 548                 }
 549         },
 550         {0, 0, 2, 0,            /* 0x44 */
 551                 {{2, 2},
 552                 {6, 6},
 553                 {0, 0},
 554                 {0, 0}
 555                 }
 556         },
 557         {1, 0, 3, 0,            /* 0x45 */
 558                 {{0, 0},
 559                 {2, 2},
 560                 {6, 6},
 561                 {0, 0}
 562                 }
 563         },
 564         {0, 0, 2, 0,            /* 0x46 */
 565                 {{1, 2},
 566                 {6, 6},
 567                 {0, 0},
 568                 {0, 0}
 569                 }
 570         },
 571         {1, 0, 2, 0,            /* 0x47 */
 572                 {{0, 2},
 573                 {6, 6},
 574                 {0, 0},
 575                 {0, 0}
 576                 }
 577         },
 578         {0, 0, 2, 0,            /* 0x48 */
 579                 {{3, 3},
 580                 {6, 6},
 581                 {0, 0},
 582                 {0, 0}
 583                 }
 584         },
 585         {1, 0, 3, 0,            /* 0x49 */
 586                 {{0, 0},
 587                 {3, 3},
 588                 {6, 6},
 589                 {0, 0}
 590                 }
 591         },
 592         {0, 0, 3, 0,            /* 0x4a */
 593                 {{1, 1},
 594                 {3, 3},
 595                 {6, 6},
 596                 {0, 0}
 597                 }
 598         },
 599         {1, 0, 3, 0,            /* 0x4b */
 600                 {{0, 1},
 601                 {3, 3},
 602                 {6, 6},
 603                 {0, 0}
 604                 }
 605         },
 606         {0, 0, 2, 0,            /* 0x4c */
 607                 {{2, 3},
 608                 {6, 6},
 609                 {0, 0},
 610                 {0, 0}
 611                 }
 612         },
 613         {1, 0, 3, 0,            /* 0x4d */
 614                 {{0, 0},
 615                 {2, 3},
 616                 {6, 6},
 617                 {0, 0}
 618                 }
 619         },
 620         {0, 0, 2, 0,            /* 0x4e */
 621                 {{1, 3},
 622                 {6, 6},
 623                 {0, 0},
 624                 {0, 0}
 625                 }
 626         },
 627         {1, 0, 2, 0,            /* 0x4f */
 628                 {{0, 3},
 629                 {6, 6},
 630                 {0, 0},
 631                 {0, 0}
 632                 }
 633         },
 634         {0, 0, 2, 0,            /* 0x50 */
 635                 {{4, 4},
 636                 {6, 6},
 637                 {0, 0},
 638                 {0, 0}
 639                 }
 640         },
 641         {1, 0, 3, 0,            /* 0x51 */
 642                 {{0, 0},
 643                 {4, 4},
 644                 {6, 6},
 645                 {0, 0}
 646                 }
 647         },
 648         {0, 0, 3, 0,            /* 0x52 */
 649                 {{1, 1},
 650                 {4, 4},
 651                 {6, 6},
 652                 {0, 0}
 653                 }
 654         },
 655         {1, 0, 3, 0,            /* 0x53 */
 656                 {{0, 1},
 657                 {4, 4},
 658                 {6, 6},
 659                 {0, 0}
 660                 }
 661         },
 662         {0, 0, 3, 0,            /* 0x54 */
 663                 {{2, 2},
 664                 {4, 4},
 665                 {6, 6},
 666                 {0, 0}
 667                 }
 668         },
 669         {1, 0, 4, 0,            /* 0x55 */
 670                 {{0, 0},
 671                 {2, 2},
 672                 {4, 4},
 673                 {6, 6}
 674                 }
 675         },
 676         {0, 0, 3, 0,            /* 0x56 */
 677                 {{1, 2},
 678                 {4, 4},
 679                 {6, 6},
 680                 {0, 0}
 681                 }
 682         },
 683         {1, 0, 3, 0,            /* 0x57 */
 684                 {{0, 2},
 685                 {4, 4},
 686                 {6, 6},
 687                 {0, 0}
 688                 }
 689         },
 690         {0, 0, 2, 0,            /* 0x58 */
 691                 {{3, 4},
 692                 {6, 6},
 693                 {0, 0},
 694                 {0, 0}
 695                 }
 696         },
 697         {1, 0, 3, 0,            /* 0x59 */
 698                 {{0, 0},
 699                 {3, 4},
 700                 {6, 6},
 701                 {0, 0}
 702                 }
 703         },
 704         {0, 0, 3, 0,            /* 0x5a */
 705                 {{1, 1},
 706                 {3, 4},
 707                 {6, 6},
 708                 {0, 0}
 709                 }
 710         },
 711         {1, 0, 3, 0,            /* 0x5b */
 712                 {{0, 1},
 713                 {3, 4},
 714                 {6, 6},
 715                 {0, 0}
 716                 }
 717         },
 718         {0, 0, 2, 0,            /* 0x5c */
 719                 {{2, 4},
 720                 {6, 6},
 721                 {0, 0},
 722                 {0, 0}
 723                 }
 724         },
 725         {1, 0, 3, 0,            /* 0x5d */
 726                 {{0, 0},
 727                 {2, 4},
 728                 {6, 6},
 729                 {0, 0}
 730                 }
 731         },
 732         {0, 0, 2, 0,            /* 0x5e */
 733                 {{1, 4},
 734                 {6, 6},
 735                 {0, 0},
 736                 {0, 0}
 737                 }
 738         },
 739         {1, 0, 2, 0,            /* 0x5f */
 740                 {{0, 4},
 741                 {6, 6},
 742                 {0, 0},
 743                 {0, 0}
 744                 }
 745         },
 746         {0, 0, 1, 0,            /* 0x60 */
 747                 {{5, 6},
 748                 {0, 0},
 749                 {0, 0},
 750                 {0, 0}
 751                 }
 752         },
 753         {1, 0, 2, 0,            /* 0x61 */
 754                 {{0, 0},
 755                 {5, 6},
 756                 {0, 0},
 757                 {0, 0}
 758                 }
 759         },
 760         {0, 0, 2, 0,            /* 0x62 */
 761                 {{1, 1},
 762                 {5, 6},
 763                 {0, 0},
 764                 {0, 0}
 765                 }
 766         },
 767         {1, 0, 2, 0,            /* 0x63 */
 768                 {{0, 1},
 769                 {5, 6},
 770                 {0, 0},
 771                 {0, 0}
 772                 }
 773         },
 774         {0, 0, 2, 0,            /* 0x64 */
 775                 {{2, 2},
 776                 {5, 6},
 777                 {0, 0},
 778                 {0, 0}
 779                 }
 780         },
 781         {1, 0, 3, 0,            /* 0x65 */
 782                 {{0, 0},
 783                 {2, 2},
 784                 {5, 6},
 785                 {0, 0}
 786                 }
 787         },
 788         {0, 0, 2, 0,            /* 0x66 */
 789                 {{1, 2},
 790                 {5, 6},
 791                 {0, 0},
 792                 {0, 0}
 793                 }
 794         },
 795         {1, 0, 2, 0,            /* 0x67 */
 796                 {{0, 2},
 797                 {5, 6},
 798                 {0, 0},
 799                 {0, 0}
 800                 }
 801         },
 802         {0, 0, 2, 0,            /* 0x68 */
 803                 {{3, 3},
 804                 {5, 6},
 805                 {0, 0},
 806                 {0, 0}
 807                 }
 808         },
 809         {1, 0, 3, 0,            /* 0x69 */
 810                 {{0, 0},
 811                 {3, 3},
 812                 {5, 6},
 813                 {0, 0}
 814                 }
 815         },
 816         {0, 0, 3, 0,            /* 0x6a */
 817                 {{1, 1},
 818                 {3, 3},
 819                 {5, 6},
 820                 {0, 0}
 821                 }
 822         },
 823         {1, 0, 3, 0,            /* 0x6b */
 824                 {{0, 1},
 825                 {3, 3},
 826                 {5, 6},
 827                 {0, 0}
 828                 }
 829         },
 830         {0, 0, 2, 0,            /* 0x6c */
 831                 {{2, 3},
 832                 {5, 6},
 833                 {0, 0},
 834                 {0, 0}
 835                 }
 836         },
 837         {1, 0, 3, 0,            /* 0x6d */
 838                 {{0, 0},
 839                 {2, 3},
 840                 {5, 6},
 841                 {0, 0}
 842                 }
 843         },
 844         {0, 0, 2, 0,            /* 0x6e */
 845                 {{1, 3},
 846                 {5, 6},
 847                 {0, 0},
 848                 {0, 0}
 849                 }
 850         },
 851         {1, 0, 2, 0,            /* 0x6f */
 852                 {{0, 3},
 853                 {5, 6},
 854                 {0, 0},
 855                 {0, 0}
 856                 }
 857         },
 858         {0, 0, 1, 0,            /* 0x70 */
 859                 {{4, 6},
 860                 {0, 0},
 861                 {0, 0},
 862                 {0, 0}
 863                 }
 864         },
 865         {1, 0, 2, 0,            /* 0x71 */
 866                 {{0, 0},
 867                 {4, 6},
 868                 {0, 0},
 869                 {0, 0}
 870                 }
 871         },
 872         {0, 0, 2, 0,            /* 0x72 */
 873                 {{1, 1},
 874                 {4, 6},
 875                 {0, 0},
 876                 {0, 0}
 877                 }
 878         },
 879         {1, 0, 2, 0,            /* 0x73 */
 880                 {{0, 1},
 881                 {4, 6},
 882                 {0, 0},
 883                 {0, 0}
 884                 }
 885         },
 886         {0, 0, 2, 0,            /* 0x74 */
 887                 {{2, 2},
 888                 {4, 6},
 889                 {0, 0},
 890                 {0, 0}
 891                 }
 892         },
 893         {1, 0, 3, 0,            /* 0x75 */
 894                 {{0, 0},
 895                 {2, 2},
 896                 {4, 6},
 897                 {0, 0}
 898                 }
 899         },
 900         {0, 0, 2, 0,            /* 0x76 */
 901                 {{1, 2},
 902                 {4, 6},
 903                 {0, 0},
 904                 {0, 0}
 905                 }
 906         },
 907         {1, 0, 2, 0,            /* 0x77 */
 908                 {{0, 2},
 909                 {4, 6},
 910                 {0, 0},
 911                 {0, 0}
 912                 }
 913         },
 914         {0, 0, 1, 0,            /* 0x78 */
 915                 {{3, 6},
 916                 {0, 0},
 917                 {0, 0},
 918                 {0, 0}
 919                 }
 920         },
 921         {1, 0, 2, 0,            /* 0x79 */
 922                 {{0, 0},
 923                 {3, 6},
 924                 {0, 0},
 925                 {0, 0}
 926                 }
 927         },
 928         {0, 0, 2, 0,            /* 0x7a */
 929                 {{1, 1},
 930                 {3, 6},
 931                 {0, 0},
 932                 {0, 0}
 933                 }
 934         },
 935         {1, 0, 2, 0,            /* 0x7b */
 936                 {{0, 1},
 937                 {3, 6},
 938                 {0, 0},
 939                 {0, 0}
 940                 }
 941         },
 942         {0, 0, 1, 0,            /* 0x7c */
 943                 {{2, 6},
 944                 {0, 0},
 945                 {0, 0},
 946                 {0, 0}
 947                 }
 948         },
 949         {1, 0, 2, 0,            /* 0x7d */
 950                 {{0, 0},
 951                 {2, 6},
 952                 {0, 0},
 953                 {0, 0}
 954                 }
 955         },
 956         {0, 0, 1, 0,            /* 0x7e */
 957                 {{1, 6},
 958                 {0, 0},
 959                 {0, 0},
 960                 {0, 0}
 961                 }
 962         },
 963         {1, 0, 1, 0,            /* 0x7f */
 964                 {{0, 6},
 965                 {0, 0},
 966                 {0, 0},
 967                 {0, 0}
 968                 }
 969         },
 970         {0, 1, 1, 0,            /* 0x80 */
 971                 {{7, 7},
 972                 {0, 0},
 973                 {0, 0},
 974                 {0, 0}
 975                 }
 976         },
 977         {1, 1, 2, 0,            /* 0x81 */
 978                 {{0, 0},
 979                 {7, 7},
 980                 {0, 0},
 981                 {0, 0}
 982                 }
 983         },
 984         {0, 1, 2, 0,            /* 0x82 */
 985                 {{1, 1},
 986                 {7, 7},
 987                 {0, 0},
 988                 {0, 0}
 989                 }
 990         },
 991         {1, 1, 2, 0,            /* 0x83 */
 992                 {{0, 1},
 993                 {7, 7},
 994                 {0, 0},
 995                 {0, 0}
 996                 }
 997         },
 998         {0, 1, 2, 0,            /* 0x84 */
 999                 {{2, 2},
1000                 {7, 7},
1001                 {0, 0},
1002                 {0, 0}
1003                 }
1004         },
1005         {1, 1, 3, 0,            /* 0x85 */
1006                 {{0, 0},
1007                 {2, 2},
1008                 {7, 7},
1009                 {0, 0}
1010                 }
1011         },
1012         {0, 1, 2, 0,            /* 0x86 */
1013                 {{1, 2},
1014                 {7, 7},
1015                 {0, 0},
1016                 {0, 0}
1017                 }
1018         },
1019         {1, 1, 2, 0,            /* 0x87 */
1020                 {{0, 2},
1021                 {7, 7},
1022                 {0, 0},
1023                 {0, 0}
1024                 }
1025         },
1026         {0, 1, 2, 0,            /* 0x88 */
1027                 {{3, 3},
1028                 {7, 7},
1029                 {0, 0},
1030                 {0, 0}
1031                 }
1032         },
1033         {1, 1, 3, 0,            /* 0x89 */
1034                 {{0, 0},
1035                 {3, 3},
1036                 {7, 7},
1037                 {0, 0}
1038                 }
1039         },
1040         {0, 1, 3, 0,            /* 0x8a */
1041                 {{1, 1},
1042                 {3, 3},
1043                 {7, 7},
1044                 {0, 0}
1045                 }
1046         },
1047         {1, 1, 3, 0,            /* 0x8b */
1048                 {{0, 1},
1049                 {3, 3},
1050                 {7, 7},
1051                 {0, 0}
1052                 }
1053         },
1054         {0, 1, 2, 0,            /* 0x8c */
1055                 {{2, 3},
1056                 {7, 7},
1057                 {0, 0},
1058                 {0, 0}
1059                 }
1060         },
1061         {1, 1, 3, 0,            /* 0x8d */
1062                 {{0, 0},
1063                 {2, 3},
1064                 {7, 7},
1065                 {0, 0}
1066                 }
1067         },
1068         {0, 1, 2, 0,            /* 0x8e */
1069                 {{1, 3},
1070                 {7, 7},
1071                 {0, 0},
1072                 {0, 0}
1073                 }
1074         },
1075         {1, 1, 2, 0,            /* 0x8f */
1076                 {{0, 3},
1077                 {7, 7},
1078                 {0, 0},
1079                 {0, 0}
1080                 }
1081         },
1082         {0, 1, 2, 0,            /* 0x90 */
1083                 {{4, 4},
1084                 {7, 7},
1085                 {0, 0},
1086                 {0, 0}
1087                 }
1088         },
1089         {1, 1, 3, 0,            /* 0x91 */
1090                 {{0, 0},
1091                 {4, 4},
1092                 {7, 7},
1093                 {0, 0}
1094                 }
1095         },
1096         {0, 1, 3, 0,            /* 0x92 */
1097                 {{1, 1},
1098                 {4, 4},
1099                 {7, 7},
1100                 {0, 0}
1101                 }
1102         },
1103         {1, 1, 3, 0,            /* 0x93 */
1104                 {{0, 1},
1105                 {4, 4},
1106                 {7, 7},
1107                 {0, 0}
1108                 }
1109         },
1110         {0, 1, 3, 0,            /* 0x94 */
1111                 {{2, 2},
1112                 {4, 4},
1113                 {7, 7},
1114                 {0, 0}
1115                 }
1116         },
1117         {1, 1, 4, 0,            /* 0x95 */
1118                 {{0, 0},
1119                 {2, 2},
1120                 {4, 4},
1121                 {7, 7}
1122                 }
1123         },
1124         {0, 1, 3, 0,            /* 0x96 */
1125                 {{1, 2},
1126                 {4, 4},
1127                 {7, 7},
1128                 {0, 0}
1129                 }
1130         },
1131         {1, 1, 3, 0,            /* 0x97 */
1132                 {{0, 2},
1133                 {4, 4},
1134                 {7, 7},
1135                 {0, 0}
1136                 }
1137         },
1138         {0, 1, 2, 0,            /* 0x98 */
1139                 {{3, 4},
1140                 {7, 7},
1141                 {0, 0},
1142                 {0, 0}
1143                 }
1144         },
1145         {1, 1, 3, 0,            /* 0x99 */
1146                 {{0, 0},
1147                 {3, 4},
1148                 {7, 7},
1149                 {0, 0}
1150                 }
1151         },
1152         {0, 1, 3, 0,            /* 0x9a */
1153                 {{1, 1},
1154                 {3, 4},
1155                 {7, 7},
1156                 {0, 0}
1157                 }
1158         },
1159         {1, 1, 3, 0,            /* 0x9b */
1160                 {{0, 1},
1161                 {3, 4},
1162                 {7, 7},
1163                 {0, 0}
1164                 }
1165         },
1166         {0, 1, 2, 0,            /* 0x9c */
1167                 {{2, 4},
1168                 {7, 7},
1169                 {0, 0},
1170                 {0, 0}
1171                 }
1172         },
1173         {1, 1, 3, 0,            /* 0x9d */
1174                 {{0, 0},
1175                 {2, 4},
1176                 {7, 7},
1177                 {0, 0}
1178                 }
1179         },
1180         {0, 1, 2, 0,            /* 0x9e */
1181                 {{1, 4},
1182                 {7, 7},
1183                 {0, 0},
1184                 {0, 0}
1185                 }
1186         },
1187         {1, 1, 2, 0,            /* 0x9f */
1188                 {{0, 4},
1189                 {7, 7},
1190                 {0, 0},
1191                 {0, 0}
1192                 }
1193         },
1194         {0, 1, 2, 0,            /* 0xa0 */
1195                 {{5, 5},
1196                 {7, 7},
1197                 {0, 0},
1198                 {0, 0}
1199                 }
1200         },
1201         {1, 1, 3, 0,            /* 0xa1 */
1202                 {{0, 0},
1203                 {5, 5},
1204                 {7, 7},
1205                 {0, 0}
1206                 }
1207         },
1208         {0, 1, 3, 0,            /* 0xa2 */
1209                 {{1, 1},
1210                 {5, 5},
1211                 {7, 7},
1212                 {0, 0}
1213                 }
1214         },
1215         {1, 1, 3, 0,            /* 0xa3 */
1216                 {{0, 1},
1217                 {5, 5},
1218                 {7, 7},
1219                 {0, 0}
1220                 }
1221         },
1222         {0, 1, 3, 0,            /* 0xa4 */
1223                 {{2, 2},
1224                 {5, 5},
1225                 {7, 7},
1226                 {0, 0}
1227                 }
1228         },
1229         {1, 1, 4, 0,            /* 0xa5 */
1230                 {{0, 0},
1231                 {2, 2},
1232                 {5, 5},
1233                 {7, 7}
1234                 }
1235         },
1236         {0, 1, 3, 0,            /* 0xa6 */
1237                 {{1, 2},
1238                 {5, 5},
1239                 {7, 7},
1240                 {0, 0}
1241                 }
1242         },
1243         {1, 1, 3, 0,            /* 0xa7 */
1244                 {{0, 2},
1245                 {5, 5},
1246                 {7, 7},
1247                 {0, 0}
1248                 }
1249         },
1250         {0, 1, 3, 0,            /* 0xa8 */
1251                 {{3, 3},
1252                 {5, 5},
1253                 {7, 7},
1254                 {0, 0}
1255                 }
1256         },
1257         {1, 1, 4, 0,            /* 0xa9 */
1258                 {{0, 0},
1259                 {3, 3},
1260                 {5, 5},
1261                 {7, 7}
1262                 }
1263         },
1264         {0, 1, 4, 0,            /* 0xaa */
1265                 {{1, 1},
1266                 {3, 3},
1267                 {5, 5},
1268                 {7, 7}
1269                 }
1270         },
1271         {1, 1, 4, 0,            /* 0xab */
1272                 {{0, 1},
1273                 {3, 3},
1274                 {5, 5},
1275                 {7, 7}
1276                 }
1277         },
1278         {0, 1, 3, 0,            /* 0xac */
1279                 {{2, 3},
1280                 {5, 5},
1281                 {7, 7},
1282                 {0, 0}
1283                 }
1284         },
1285         {1, 1, 4, 0,            /* 0xad */
1286                 {{0, 0},
1287                 {2, 3},
1288                 {5, 5},
1289                 {7, 7}
1290                 }
1291         },
1292         {0, 1, 3, 0,            /* 0xae */
1293                 {{1, 3},
1294                 {5, 5},
1295                 {7, 7},
1296                 {0, 0}
1297                 }
1298         },
1299         {1, 1, 3, 0,            /* 0xaf */
1300                 {{0, 3},
1301                 {5, 5},
1302                 {7, 7},
1303                 {0, 0}
1304                 }
1305         },
1306         {0, 1, 2, 0,            /* 0xb0 */
1307                 {{4, 5},
1308                 {7, 7},
1309                 {0, 0},
1310                 {0, 0}
1311                 }
1312         },
1313         {1, 1, 3, 0,            /* 0xb1 */
1314                 {{0, 0},
1315                 {4, 5},
1316                 {7, 7},
1317                 {0, 0}
1318                 }
1319         },
1320         {0, 1, 3, 0,            /* 0xb2 */
1321                 {{1, 1},
1322                 {4, 5},
1323                 {7, 7},
1324                 {0, 0}
1325                 }
1326         },
1327         {1, 1, 3, 0,            /* 0xb3 */
1328                 {{0, 1},
1329                 {4, 5},
1330                 {7, 7},
1331                 {0, 0}
1332                 }
1333         },
1334         {0, 1, 3, 0,            /* 0xb4 */
1335                 {{2, 2},
1336                 {4, 5},
1337                 {7, 7},
1338                 {0, 0}
1339                 }
1340         },
1341         {1, 1, 4, 0,            /* 0xb5 */
1342                 {{0, 0},
1343                 {2, 2},
1344                 {4, 5},
1345                 {7, 7}
1346                 }
1347         },
1348         {0, 1, 3, 0,            /* 0xb6 */
1349                 {{1, 2},
1350                 {4, 5},
1351                 {7, 7},
1352                 {0, 0}
1353                 }
1354         },
1355         {1, 1, 3, 0,            /* 0xb7 */
1356                 {{0, 2},
1357                 {4, 5},
1358                 {7, 7},
1359                 {0, 0}
1360                 }
1361         },
1362         {0, 1, 2, 0,            /* 0xb8 */
1363                 {{3, 5},
1364                 {7, 7},
1365                 {0, 0},
1366                 {0, 0}
1367                 }
1368         },
1369         {1, 1, 3, 0,            /* 0xb9 */
1370                 {{0, 0},
1371                 {3, 5},
1372                 {7, 7},
1373                 {0, 0}
1374                 }
1375         },
1376         {0, 1, 3, 0,            /* 0xba */
1377                 {{1, 1},
1378                 {3, 5},
1379                 {7, 7},
1380                 {0, 0}
1381                 }
1382         },
1383         {1, 1, 3, 0,            /* 0xbb */
1384                 {{0, 1},
1385                 {3, 5},
1386                 {7, 7},
1387                 {0, 0}
1388                 }
1389         },
1390         {0, 1, 2, 0,            /* 0xbc */
1391                 {{2, 5},
1392                 {7, 7},
1393                 {0, 0},
1394                 {0, 0}
1395                 }
1396         },
1397         {1, 1, 3, 0,            /* 0xbd */
1398                 {{0, 0},
1399                 {2, 5},
1400                 {7, 7},
1401                 {0, 0}
1402                 }
1403         },
1404         {0, 1, 2, 0,            /* 0xbe */
1405                 {{1, 5},
1406                 {7, 7},
1407                 {0, 0},
1408                 {0, 0}
1409                 }
1410         },
1411         {1, 1, 2, 0,            /* 0xbf */
1412                 {{0, 5},
1413                 {7, 7},
1414                 {0, 0},
1415                 {0, 0}
1416                 }
1417         },
1418         {0, 1, 1, 0,            /* 0xc0 */
1419                 {{6, 7},
1420                 {0, 0},
1421                 {0, 0},
1422                 {0, 0}
1423                 }
1424         },
1425         {1, 1, 2, 0,            /* 0xc1 */
1426                 {{0, 0},
1427                 {6, 7},
1428                 {0, 0},
1429                 {0, 0}
1430                 }
1431         },
1432         {0, 1, 2, 0,            /* 0xc2 */
1433                 {{1, 1},
1434                 {6, 7},
1435                 {0, 0},
1436                 {0, 0}
1437                 }
1438         },
1439         {1, 1, 2, 0,            /* 0xc3 */
1440                 {{0, 1},
1441                 {6, 7},
1442                 {0, 0},
1443                 {0, 0}
1444                 }
1445         },
1446         {0, 1, 2, 0,            /* 0xc4 */
1447                 {{2, 2},
1448                 {6, 7},
1449                 {0, 0},
1450                 {0, 0}
1451                 }
1452         },
1453         {1, 1, 3, 0,            /* 0xc5 */
1454                 {{0, 0},
1455                 {2, 2},
1456                 {6, 7},
1457                 {0, 0}
1458                 }
1459         },
1460         {0, 1, 2, 0,            /* 0xc6 */
1461                 {{1, 2},
1462                 {6, 7},
1463                 {0, 0},
1464                 {0, 0}
1465                 }
1466         },
1467         {1, 1, 2, 0,            /* 0xc7 */
1468                 {{0, 2},
1469                 {6, 7},
1470                 {0, 0},
1471                 {0, 0}
1472                 }
1473         },
1474         {0, 1, 2, 0,            /* 0xc8 */
1475                 {{3, 3},
1476                 {6, 7},
1477                 {0, 0},
1478                 {0, 0}
1479                 }
1480         },
1481         {1, 1, 3, 0,            /* 0xc9 */
1482                 {{0, 0},
1483                 {3, 3},
1484                 {6, 7},
1485                 {0, 0}
1486                 }
1487         },
1488         {0, 1, 3, 0,            /* 0xca */
1489                 {{1, 1},
1490                 {3, 3},
1491                 {6, 7},
1492                 {0, 0}
1493                 }
1494         },
1495         {1, 1, 3, 0,            /* 0xcb */
1496                 {{0, 1},
1497                 {3, 3},
1498                 {6, 7},
1499                 {0, 0}
1500                 }
1501         },
1502         {0, 1, 2, 0,            /* 0xcc */
1503                 {{2, 3},
1504                 {6, 7},
1505                 {0, 0},
1506                 {0, 0}
1507                 }
1508         },
1509         {1, 1, 3, 0,            /* 0xcd */
1510                 {{0, 0},
1511                 {2, 3},
1512                 {6, 7},
1513                 {0, 0}
1514                 }
1515         },
1516         {0, 1, 2, 0,            /* 0xce */
1517                 {{1, 3},
1518                 {6, 7},
1519                 {0, 0},
1520                 {0, 0}
1521                 }
1522         },
1523         {1, 1, 2, 0,            /* 0xcf */
1524                 {{0, 3},
1525                 {6, 7},
1526                 {0, 0},
1527                 {0, 0}
1528                 }
1529         },
1530         {0, 1, 2, 0,            /* 0xd0 */
1531                 {{4, 4},
1532                 {6, 7},
1533                 {0, 0},
1534                 {0, 0}
1535                 }
1536         },
1537         {1, 1, 3, 0,            /* 0xd1 */
1538                 {{0, 0},
1539                 {4, 4},
1540                 {6, 7},
1541                 {0, 0}
1542                 }
1543         },
1544         {0, 1, 3, 0,            /* 0xd2 */
1545                 {{1, 1},
1546                 {4, 4},
1547                 {6, 7},
1548                 {0, 0}
1549                 }
1550         },
1551         {1, 1, 3, 0,            /* 0xd3 */
1552                 {{0, 1},
1553                 {4, 4},
1554                 {6, 7},
1555                 {0, 0}
1556                 }
1557         },
1558         {0, 1, 3, 0,            /* 0xd4 */
1559                 {{2, 2},
1560                 {4, 4},
1561                 {6, 7},
1562                 {0, 0}
1563                 }
1564         },
1565         {1, 1, 4, 0,            /* 0xd5 */
1566                 {{0, 0},
1567                 {2, 2},
1568                 {4, 4},
1569                 {6, 7}
1570                 }
1571         },
1572         {0, 1, 3, 0,            /* 0xd6 */
1573                 {{1, 2},
1574                 {4, 4},
1575                 {6, 7},
1576                 {0, 0}
1577                 }
1578         },
1579         {1, 1, 3, 0,            /* 0xd7 */
1580                 {{0, 2},
1581                 {4, 4},
1582                 {6, 7},
1583                 {0, 0}
1584                 }
1585         },
1586         {0, 1, 2, 0,            /* 0xd8 */
1587                 {{3, 4},
1588                 {6, 7},
1589                 {0, 0},
1590                 {0, 0}
1591                 }
1592         },
1593         {1, 1, 3, 0,            /* 0xd9 */
1594                 {{0, 0},
1595                 {3, 4},
1596                 {6, 7},
1597                 {0, 0}
1598                 }
1599         },
1600         {0, 1, 3, 0,            /* 0xda */
1601                 {{1, 1},
1602                 {3, 4},
1603                 {6, 7},
1604                 {0, 0}
1605                 }
1606         },
1607         {1, 1, 3, 0,            /* 0xdb */
1608                 {{0, 1},
1609                 {3, 4},
1610                 {6, 7},
1611                 {0, 0}
1612                 }
1613         },
1614         {0, 1, 2, 0,            /* 0xdc */
1615                 {{2, 4},
1616                 {6, 7},
1617                 {0, 0},
1618                 {0, 0}
1619                 }
1620         },
1621         {1, 1, 3, 0,            /* 0xdd */
1622                 {{0, 0},
1623                 {2, 4},
1624                 {6, 7},
1625                 {0, 0}
1626                 }
1627         },
1628         {0, 1, 2, 0,            /* 0xde */
1629                 {{1, 4},
1630                 {6, 7},
1631                 {0, 0},
1632                 {0, 0}
1633                 }
1634         },
1635         {1, 1, 2, 0,            /* 0xdf */
1636                 {{0, 4},
1637                 {6, 7},
1638                 {0, 0},
1639                 {0, 0}
1640                 }
1641         },
1642         {0, 1, 1, 0,            /* 0xe0 */
1643                 {{5, 7},
1644                 {0, 0},
1645                 {0, 0},
1646                 {0, 0}
1647                 }
1648         },
1649         {1, 1, 2, 0,            /* 0xe1 */
1650                 {{0, 0},
1651                 {5, 7},
1652                 {0, 0},
1653                 {0, 0}
1654                 }
1655         },
1656         {0, 1, 2, 0,            /* 0xe2 */
1657                 {{1, 1},
1658                 {5, 7},
1659                 {0, 0},
1660                 {0, 0}
1661                 }
1662         },
1663         {1, 1, 2, 0,            /* 0xe3 */
1664                 {{0, 1},
1665                 {5, 7},
1666                 {0, 0},
1667                 {0, 0}
1668                 }
1669         },
1670         {0, 1, 2, 0,            /* 0xe4 */
1671                 {{2, 2},
1672                 {5, 7},
1673                 {0, 0},
1674                 {0, 0}
1675                 }
1676         },
1677         {1, 1, 3, 0,            /* 0xe5 */
1678                 {{0, 0},
1679                 {2, 2},
1680                 {5, 7},
1681                 {0, 0}
1682                 }
1683         },
1684         {0, 1, 2, 0,            /* 0xe6 */
1685                 {{1, 2},
1686                 {5, 7},
1687                 {0, 0},
1688                 {0, 0}
1689                 }
1690         },
1691         {1, 1, 2, 0,            /* 0xe7 */
1692                 {{0, 2},
1693                 {5, 7},
1694                 {0, 0},
1695                 {0, 0}
1696                 }
1697         },
1698         {0, 1, 2, 0,            /* 0xe8 */
1699                 {{3, 3},
1700                 {5, 7},
1701                 {0, 0},
1702                 {0, 0}
1703                 }
1704         },
1705         {1, 1, 3, 0,            /* 0xe9 */
1706                 {{0, 0},
1707                 {3, 3},
1708                 {5, 7},
1709                 {0, 0}
1710                 }
1711         },
1712         {0, 1, 3, 0,            /* 0xea */
1713                 {{1, 1},
1714                 {3, 3},
1715                 {5, 7},
1716                 {0, 0}
1717                 }
1718         },
1719         {1, 1, 3, 0,            /* 0xeb */
1720                 {{0, 1},
1721                 {3, 3},
1722                 {5, 7},
1723                 {0, 0}
1724                 }
1725         },
1726         {0, 1, 2, 0,            /* 0xec */
1727                 {{2, 3},
1728                 {5, 7},
1729                 {0, 0},
1730                 {0, 0}
1731                 }
1732         },
1733         {1, 1, 3, 0,            /* 0xed */
1734                 {{0, 0},
1735                 {2, 3},
1736                 {5, 7},
1737                 {0, 0}
1738                 }
1739         },
1740         {0, 1, 2, 0,            /* 0xee */
1741                 {{1, 3},
1742                 {5, 7},
1743                 {0, 0},
1744                 {0, 0}
1745                 }
1746         },
1747         {1, 1, 2, 0,            /* 0xef */
1748                 {{0, 3},
1749                 {5, 7},
1750                 {0, 0},
1751                 {0, 0}
1752                 }
1753         },
1754         {0, 1, 1, 0,            /* 0xf0 */
1755                 {{4, 7},
1756                 {0, 0},
1757                 {0, 0},
1758                 {0, 0}
1759                 }
1760         },
1761         {1, 1, 2, 0,            /* 0xf1 */
1762                 {{0, 0},
1763                 {4, 7},
1764                 {0, 0},
1765                 {0, 0}
1766                 }
1767         },
1768         {0, 1, 2, 0,            /* 0xf2 */
1769                 {{1, 1},
1770                 {4, 7},
1771                 {0, 0},
1772                 {0, 0}
1773                 }
1774         },
1775         {1, 1, 2, 0,            /* 0xf3 */
1776                 {{0, 1},
1777                 {4, 7},
1778                 {0, 0},
1779                 {0, 0}
1780                 }
1781         },
1782         {0, 1, 2, 0,            /* 0xf4 */
1783                 {{2, 2},
1784                 {4, 7},
1785                 {0, 0},
1786                 {0, 0}
1787                 }
1788         },
1789         {1, 1, 3, 0,            /* 0xf5 */
1790                 {{0, 0},
1791                 {2, 2},
1792                 {4, 7},
1793                 {0, 0}
1794                 }
1795         },
1796         {0, 1, 2, 0,            /* 0xf6 */
1797                 {{1, 2},
1798                 {4, 7},
1799                 {0, 0},
1800                 {0, 0}
1801                 }
1802         },
1803         {1, 1, 2, 0,            /* 0xf7 */
1804                 {{0, 2},
1805                 {4, 7},
1806                 {0, 0},
1807                 {0, 0}
1808                 }
1809         },
1810         {0, 1, 1, 0,            /* 0xf8 */
1811                 {{3, 7},
1812                 {0, 0},
1813                 {0, 0},
1814                 {0, 0}
1815                 }
1816         },
1817         {1, 1, 2, 0,            /* 0xf9 */
1818                 {{0, 0},
1819                 {3, 7},
1820                 {0, 0},
1821                 {0, 0}
1822                 }
1823         },
1824         {0, 1, 2, 0,            /* 0xfa */
1825                 {{1, 1},
1826                 {3, 7},
1827                 {0, 0},
1828                 {0, 0}
1829                 }
1830         },
1831         {1, 1, 2, 0,            /* 0xfb */
1832                 {{0, 1},
1833                 {3, 7},
1834                 {0, 0},
1835                 {0, 0}
1836                 }
1837         },
1838         {0, 1, 1, 0,            /* 0xfc */
1839                 {{2, 7},
1840                 {0, 0},
1841                 {0, 0},
1842                 {0, 0}
1843                 }
1844         },
1845         {1, 1, 2, 0,            /* 0xfd */
1846                 {{0, 0},
1847                 {2, 7},
1848                 {0, 0},
1849                 {0, 0}
1850                 }
1851         },
1852         {0, 1, 1, 0,            /* 0xfe */
1853                 {{1, 7},
1854                 {0, 0},
1855                 {0, 0},
1856                 {0, 0}
1857                 }
1858         },
1859         {1, 1, 1, 0,            /* 0xff */
1860                 {{0, 7},
1861                 {0, 0},
1862                 {0, 0},
1863                 {0, 0}
1864                 }
1865         }
1866 };
1867
1868
1869 int
1870 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1871     struct sctp_scoping *scope,
1872     int do_update)
1873 {
1874         if ((scope->loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (scope->ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = &ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((scope->ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (scope->ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = &ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((scope->site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1944 {
1945 #if defined(INET) || defined(INET6)
1946         struct sctp_paramhdr *paramh;
1947         struct mbuf *mret;
1948         uint16_t plen;
1949 #endif
1950
1951         switch (ifa->address.sa.sa_family) {
1952 #ifdef INET
1953         case AF_INET:
1954                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1955                 break;
1956 #endif
1957 #ifdef INET6
1958         case AF_INET6:
1959                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1960                 break;
1961 #endif
1962         default:
1963                 return (m);
1964         }
1965 #if defined(INET) || defined(INET6)
1966         if (M_TRAILINGSPACE(m) >= plen) {
1967                 /* easy side we just drop it on the end */
1968                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1969                 mret = m;
1970         } else {
1971                 /* Need more space */
1972                 mret = m;
1973                 while (SCTP_BUF_NEXT(mret) != NULL) {
1974                         mret = SCTP_BUF_NEXT(mret);
1975                 }
1976                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1977                 if (SCTP_BUF_NEXT(mret) == NULL) {
1978                         /* We are hosed, can't add more addresses */
1979                         return (m);
1980                 }
1981                 mret = SCTP_BUF_NEXT(mret);
1982                 paramh = mtod(mret, struct sctp_paramhdr *);
1983         }
1984         /* now add the parameter */
1985         switch (ifa->address.sa.sa_family) {
1986 #ifdef INET
1987         case AF_INET:
1988                 {
1989                         struct sctp_ipv4addr_param *ipv4p;
1990                         struct sockaddr_in *sin;
1991
1992                         sin = &ifa->address.sin;
1993                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1994                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1995                         paramh->param_length = htons(plen);
1996                         ipv4p->addr = sin->sin_addr.s_addr;
1997                         SCTP_BUF_LEN(mret) += plen;
1998                         break;
1999                 }
2000 #endif
2001 #ifdef INET6
2002         case AF_INET6:
2003                 {
2004                         struct sctp_ipv6addr_param *ipv6p;
2005                         struct sockaddr_in6 *sin6;
2006
2007                         sin6 = &ifa->address.sin6;
2008                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2009                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2010                         paramh->param_length = htons(plen);
2011                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2012                             sizeof(ipv6p->addr));
2013                         /* clear embedded scope in the address */
2014                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2015                         SCTP_BUF_LEN(mret) += plen;
2016                         break;
2017                 }
2018 #endif
2019         default:
2020                 return (m);
2021         }
2022         if (len != NULL) {
2023                 *len += plen;
2024         }
2025         return (mret);
2026 #endif
2027 }
2028
2029
2030 struct mbuf *
2031 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2032     struct sctp_scoping *scope,
2033     struct mbuf *m_at, int cnt_inits_to,
2034     uint16_t *padding_len, uint16_t *chunk_len)
2035 {
2036         struct sctp_vrf *vrf = NULL;
2037         int cnt, limit_out = 0, total_count;
2038         uint32_t vrf_id;
2039
2040         vrf_id = inp->def_vrf_id;
2041         SCTP_IPI_ADDR_RLOCK();
2042         vrf = sctp_find_vrf(vrf_id);
2043         if (vrf == NULL) {
2044                 SCTP_IPI_ADDR_RUNLOCK();
2045                 return (m_at);
2046         }
2047         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2048                 struct sctp_ifa *sctp_ifap;
2049                 struct sctp_ifn *sctp_ifnp;
2050
2051                 cnt = cnt_inits_to;
2052                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2053                         limit_out = 1;
2054                         cnt = SCTP_ADDRESS_LIMIT;
2055                         goto skip_count;
2056                 }
2057                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2058                         if ((scope->loopback_scope == 0) &&
2059                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2060                                 /*
2061                                  * Skip loopback devices if loopback_scope
2062                                  * not set
2063                                  */
2064                                 continue;
2065                         }
2066                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2067 #ifdef INET
2068                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2069                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2070                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2071                                         continue;
2072                                 }
2073 #endif
2074 #ifdef INET6
2075                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2076                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2077                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2078                                         continue;
2079                                 }
2080 #endif
2081                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2082                                         continue;
2083                                 }
2084                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2085                                         continue;
2086                                 }
2087                                 cnt++;
2088                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2089                                         break;
2090                                 }
2091                         }
2092                         if (cnt > SCTP_ADDRESS_LIMIT) {
2093                                 break;
2094                         }
2095                 }
2096 skip_count:
2097                 if (cnt > 1) {
2098                         total_count = 0;
2099                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2100                                 cnt = 0;
2101                                 if ((scope->loopback_scope == 0) &&
2102                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2103                                         /*
2104                                          * Skip loopback devices if
2105                                          * loopback_scope not set
2106                                          */
2107                                         continue;
2108                                 }
2109                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2110 #ifdef INET
2111                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2112                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2113                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2114                                                 continue;
2115                                         }
2116 #endif
2117 #ifdef INET6
2118                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2119                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2120                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2121                                                 continue;
2122                                         }
2123 #endif
2124                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2125                                                 continue;
2126                                         }
2127                                         if (sctp_is_address_in_scope(sctp_ifap,
2128                                             scope, 0) == 0) {
2129                                                 continue;
2130                                         }
2131                                         if ((chunk_len != NULL) &&
2132                                             (padding_len != NULL) &&
2133                                             (*padding_len > 0)) {
2134                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2135                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2136                                                 *chunk_len += *padding_len;
2137                                                 *padding_len = 0;
2138                                         }
2139                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2140                                         if (limit_out) {
2141                                                 cnt++;
2142                                                 total_count++;
2143                                                 if (cnt >= 2) {
2144                                                         /*
2145                                                          * two from each
2146                                                          * address
2147                                                          */
2148                                                         break;
2149                                                 }
2150                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2151                                                         /* No more addresses */
2152                                                         break;
2153                                                 }
2154                                         }
2155                                 }
2156                         }
2157                 }
2158         } else {
2159                 struct sctp_laddr *laddr;
2160
2161                 cnt = cnt_inits_to;
2162                 /* First, how many ? */
2163                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2164                         if (laddr->ifa == NULL) {
2165                                 continue;
2166                         }
2167                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2168                                 /*
2169                                  * Address being deleted by the system, dont
2170                                  * list.
2171                                  */
2172                                 continue;
2173                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2174                                 /*
2175                                  * Address being deleted on this ep don't
2176                                  * list.
2177                                  */
2178                                 continue;
2179                         }
2180                         if (sctp_is_address_in_scope(laddr->ifa,
2181                             scope, 1) == 0) {
2182                                 continue;
2183                         }
2184                         cnt++;
2185                 }
2186                 /*
2187                  * To get through a NAT we only list addresses if we have
2188                  * more than one. That way if you just bind a single address
2189                  * we let the source of the init dictate our address.
2190                  */
2191                 if (cnt > 1) {
2192                         cnt = cnt_inits_to;
2193                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2194                                 if (laddr->ifa == NULL) {
2195                                         continue;
2196                                 }
2197                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2198                                         continue;
2199                                 }
2200                                 if (sctp_is_address_in_scope(laddr->ifa,
2201                                     scope, 0) == 0) {
2202                                         continue;
2203                                 }
2204                                 if ((chunk_len != NULL) &&
2205                                     (padding_len != NULL) &&
2206                                     (*padding_len > 0)) {
2207                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2208                                         SCTP_BUF_LEN(m_at) += *padding_len;
2209                                         *chunk_len += *padding_len;
2210                                         *padding_len = 0;
2211                                 }
2212                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2213                                 cnt++;
2214                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2215                                         break;
2216                                 }
2217                         }
2218                 }
2219         }
2220         SCTP_IPI_ADDR_RUNLOCK();
2221         return (m_at);
2222 }
2223
2224 static struct sctp_ifa *
2225 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2226     uint8_t dest_is_loop,
2227     uint8_t dest_is_priv,
2228     sa_family_t fam)
2229 {
2230         uint8_t dest_is_global = 0;
2231
2232         /* dest_is_priv is true if destination is a private address */
2233         /* dest_is_loop is true if destination is a loopback addresses */
2234
2235         /**
2236          * Here we determine if its a preferred address. A preferred address
2237          * means it is the same scope or higher scope then the destination.
2238          * L = loopback, P = private, G = global
2239          * -----------------------------------------
2240          *    src    |  dest | result
2241          *  ----------------------------------------
2242          *     L     |    L  |    yes
2243          *  -----------------------------------------
2244          *     P     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     G     |    L  |    yes-v4 no-v6
2247          *  -----------------------------------------
2248          *     L     |    P  |    no
2249          *  -----------------------------------------
2250          *     P     |    P  |    yes
2251          *  -----------------------------------------
2252          *     G     |    P  |    no
2253          *   -----------------------------------------
2254          *     L     |    G  |    no
2255          *   -----------------------------------------
2256          *     P     |    G  |    no
2257          *    -----------------------------------------
2258          *     G     |    G  |    yes
2259          *    -----------------------------------------
2260          */
2261
2262         if (ifa->address.sa.sa_family != fam) {
2263                 /* forget mis-matched family */
2264                 return (NULL);
2265         }
2266         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2267                 dest_is_global = 1;
2268         }
2269         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2270         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2271         /* Ok the address may be ok */
2272 #ifdef INET6
2273         if (fam == AF_INET6) {
2274                 /* ok to use deprecated addresses? no lets not! */
2275                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2276                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2277                         return (NULL);
2278                 }
2279                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2280                         if (dest_is_loop) {
2281                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2282                                 return (NULL);
2283                         }
2284                 }
2285                 if (ifa->src_is_glob) {
2286                         if (dest_is_loop) {
2287                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2288                                 return (NULL);
2289                         }
2290                 }
2291         }
2292 #endif
2293         /*
2294          * Now that we know what is what, implement or table this could in
2295          * theory be done slicker (it used to be), but this is
2296          * straightforward and easier to validate :-)
2297          */
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2299             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2300         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2301             dest_is_loop, dest_is_priv, dest_is_global);
2302
2303         if ((ifa->src_is_loop) && (dest_is_priv)) {
2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2305                 return (NULL);
2306         }
2307         if ((ifa->src_is_glob) && (dest_is_priv)) {
2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2309                 return (NULL);
2310         }
2311         if ((ifa->src_is_loop) && (dest_is_global)) {
2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2313                 return (NULL);
2314         }
2315         if ((ifa->src_is_priv) && (dest_is_global)) {
2316                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2317                 return (NULL);
2318         }
2319         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2320         /* its a preferred address */
2321         return (ifa);
2322 }
2323
2324 static struct sctp_ifa *
2325 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2326     uint8_t dest_is_loop,
2327     uint8_t dest_is_priv,
2328     sa_family_t fam)
2329 {
2330         uint8_t dest_is_global = 0;
2331
2332         /**
2333          * Here we determine if its a acceptable address. A acceptable
2334          * address means it is the same scope or higher scope but we can
2335          * allow for NAT which means its ok to have a global dest and a
2336          * private src.
2337          *
2338          * L = loopback, P = private, G = global
2339          * -----------------------------------------
2340          *  src    |  dest | result
2341          * -----------------------------------------
2342          *   L     |   L   |    yes
2343          *  -----------------------------------------
2344          *   P     |   L   |    yes-v4 no-v6
2345          *  -----------------------------------------
2346          *   G     |   L   |    yes
2347          * -----------------------------------------
2348          *   L     |   P   |    no
2349          * -----------------------------------------
2350          *   P     |   P   |    yes
2351          * -----------------------------------------
2352          *   G     |   P   |    yes - May not work
2353          * -----------------------------------------
2354          *   L     |   G   |    no
2355          * -----------------------------------------
2356          *   P     |   G   |    yes - May not work
2357          * -----------------------------------------
2358          *   G     |   G   |    yes
2359          * -----------------------------------------
2360          */
2361
2362         if (ifa->address.sa.sa_family != fam) {
2363                 /* forget non matching family */
2364                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2365                     ifa->address.sa.sa_family, fam);
2366                 return (NULL);
2367         }
2368         /* Ok the address may be ok */
2369         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2370         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2371             dest_is_loop, dest_is_priv);
2372         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2373                 dest_is_global = 1;
2374         }
2375 #ifdef INET6
2376         if (fam == AF_INET6) {
2377                 /* ok to use deprecated addresses? */
2378                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2379                         return (NULL);
2380                 }
2381                 if (ifa->src_is_priv) {
2382                         /* Special case, linklocal to loop */
2383                         if (dest_is_loop)
2384                                 return (NULL);
2385                 }
2386         }
2387 #endif
2388         /*
2389          * Now that we know what is what, implement our table. This could in
2390          * theory be done slicker (it used to be), but this is
2391          * straightforward and easier to validate :-)
2392          */
2393         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2394             ifa->src_is_loop,
2395             dest_is_priv);
2396         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2397                 return (NULL);
2398         }
2399         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2400             ifa->src_is_loop,
2401             dest_is_global);
2402         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2403                 return (NULL);
2404         }
2405         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2406         /* its an acceptable address */
2407         return (ifa);
2408 }
2409
2410 int
2411 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2412 {
2413         struct sctp_laddr *laddr;
2414
2415         if (stcb == NULL) {
2416                 /* There are no restrictions, no TCB :-) */
2417                 return (0);
2418         }
2419         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2420                 if (laddr->ifa == NULL) {
2421                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2422                             __func__);
2423                         continue;
2424                 }
2425                 if (laddr->ifa == ifa) {
2426                         /* Yes it is on the list */
2427                         return (1);
2428                 }
2429         }
2430         return (0);
2431 }
2432
2433
2434 int
2435 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2436 {
2437         struct sctp_laddr *laddr;
2438
2439         if (ifa == NULL)
2440                 return (0);
2441         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2442                 if (laddr->ifa == NULL) {
2443                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2444                             __func__);
2445                         continue;
2446                 }
2447                 if ((laddr->ifa == ifa) && laddr->action == 0)
2448                         /* same pointer */
2449                         return (1);
2450         }
2451         return (0);
2452 }
2453
2454
2455
2456 static struct sctp_ifa *
2457 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2458     sctp_route_t *ro,
2459     uint32_t vrf_id,
2460     int non_asoc_addr_ok,
2461     uint8_t dest_is_priv,
2462     uint8_t dest_is_loop,
2463     sa_family_t fam)
2464 {
2465         struct sctp_laddr *laddr, *starting_point;
2466         void *ifn;
2467         int resettotop = 0;
2468         struct sctp_ifn *sctp_ifn;
2469         struct sctp_ifa *sctp_ifa, *sifa;
2470         struct sctp_vrf *vrf;
2471         uint32_t ifn_index;
2472
2473         vrf = sctp_find_vrf(vrf_id);
2474         if (vrf == NULL)
2475                 return (NULL);
2476
2477         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2478         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2479         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2480         /*
2481          * first question, is the ifn we will emit on in our list, if so, we
2482          * want such an address. Note that we first looked for a preferred
2483          * address.
2484          */
2485         if (sctp_ifn) {
2486                 /* is a preferred one on the interface we route out? */
2487                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2488 #ifdef INET
2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2490                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2491                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2492                                 continue;
2493                         }
2494 #endif
2495 #ifdef INET6
2496                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2497                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2498                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2499                                 continue;
2500                         }
2501 #endif
2502                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2503                             (non_asoc_addr_ok == 0))
2504                                 continue;
2505                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2506                             dest_is_loop,
2507                             dest_is_priv, fam);
2508                         if (sifa == NULL)
2509                                 continue;
2510                         if (sctp_is_addr_in_ep(inp, sifa)) {
2511                                 atomic_add_int(&sifa->refcount, 1);
2512                                 return (sifa);
2513                         }
2514                 }
2515         }
2516         /*
2517          * ok, now we now need to find one on the list of the addresses. We
2518          * can't get one on the emitting interface so let's find first a
2519          * preferred one. If not that an acceptable one otherwise... we
2520          * return NULL.
2521          */
2522         starting_point = inp->next_addr_touse;
2523 once_again:
2524         if (inp->next_addr_touse == NULL) {
2525                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2526                 resettotop = 1;
2527         }
2528         for (laddr = inp->next_addr_touse; laddr;
2529             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2530                 if (laddr->ifa == NULL) {
2531                         /* address has been removed */
2532                         continue;
2533                 }
2534                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2535                         /* address is being deleted */
2536                         continue;
2537                 }
2538                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2539                     dest_is_priv, fam);
2540                 if (sifa == NULL)
2541                         continue;
2542                 atomic_add_int(&sifa->refcount, 1);
2543                 return (sifa);
2544         }
2545         if (resettotop == 0) {
2546                 inp->next_addr_touse = NULL;
2547                 goto once_again;
2548         }
2549
2550         inp->next_addr_touse = starting_point;
2551         resettotop = 0;
2552 once_again_too:
2553         if (inp->next_addr_touse == NULL) {
2554                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2555                 resettotop = 1;
2556         }
2557
2558         /* ok, what about an acceptable address in the inp */
2559         for (laddr = inp->next_addr_touse; laddr;
2560             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2561                 if (laddr->ifa == NULL) {
2562                         /* address has been removed */
2563                         continue;
2564                 }
2565                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2566                         /* address is being deleted */
2567                         continue;
2568                 }
2569                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2570                     dest_is_priv, fam);
2571                 if (sifa == NULL)
2572                         continue;
2573                 atomic_add_int(&sifa->refcount, 1);
2574                 return (sifa);
2575         }
2576         if (resettotop == 0) {
2577                 inp->next_addr_touse = NULL;
2578                 goto once_again_too;
2579         }
2580
2581         /*
2582          * no address bound can be a source for the destination we are in
2583          * trouble
2584          */
2585         return (NULL);
2586 }
2587
2588
2589
2590 static struct sctp_ifa *
2591 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2592     struct sctp_tcb *stcb,
2593     sctp_route_t *ro,
2594     uint32_t vrf_id,
2595     uint8_t dest_is_priv,
2596     uint8_t dest_is_loop,
2597     int non_asoc_addr_ok,
2598     sa_family_t fam)
2599 {
2600         struct sctp_laddr *laddr, *starting_point;
2601         void *ifn;
2602         struct sctp_ifn *sctp_ifn;
2603         struct sctp_ifa *sctp_ifa, *sifa;
2604         uint8_t start_at_beginning = 0;
2605         struct sctp_vrf *vrf;
2606         uint32_t ifn_index;
2607
2608         /*
2609          * first question, is the ifn we will emit on in our list, if so, we
2610          * want that one.
2611          */
2612         vrf = sctp_find_vrf(vrf_id);
2613         if (vrf == NULL)
2614                 return (NULL);
2615
2616         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2617         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2618         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2619
2620         /*
2621          * first question, is the ifn we will emit on in our list?  If so,
2622          * we want that one. First we look for a preferred. Second, we go
2623          * for an acceptable.
2624          */
2625         if (sctp_ifn) {
2626                 /* first try for a preferred address on the ep */
2627                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2628 #ifdef INET
2629                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2630                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2631                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2632                                 continue;
2633                         }
2634 #endif
2635 #ifdef INET6
2636                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2637                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2638                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2639                                 continue;
2640                         }
2641 #endif
2642                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2643                                 continue;
2644                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2645                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2646                                 if (sifa == NULL)
2647                                         continue;
2648                                 if (((non_asoc_addr_ok == 0) &&
2649                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2650                                     (non_asoc_addr_ok &&
2651                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2652                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2653                                         /* on the no-no list */
2654                                         continue;
2655                                 }
2656                                 atomic_add_int(&sifa->refcount, 1);
2657                                 return (sifa);
2658                         }
2659                 }
2660                 /* next try for an acceptable address on the ep */
2661                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2662 #ifdef INET
2663                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2664                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2665                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2666                                 continue;
2667                         }
2668 #endif
2669 #ifdef INET6
2670                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2671                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2672                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2673                                 continue;
2674                         }
2675 #endif
2676                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2677                                 continue;
2678                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2679                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2680                                 if (sifa == NULL)
2681                                         continue;
2682                                 if (((non_asoc_addr_ok == 0) &&
2683                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2684                                     (non_asoc_addr_ok &&
2685                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2686                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2687                                         /* on the no-no list */
2688                                         continue;
2689                                 }
2690                                 atomic_add_int(&sifa->refcount, 1);
2691                                 return (sifa);
2692                         }
2693                 }
2694
2695         }
2696         /*
2697          * if we can't find one like that then we must look at all addresses
2698          * bound to pick one at first preferable then secondly acceptable.
2699          */
2700         starting_point = stcb->asoc.last_used_address;
2701 sctp_from_the_top:
2702         if (stcb->asoc.last_used_address == NULL) {
2703                 start_at_beginning = 1;
2704                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2705         }
2706         /* search beginning with the last used address */
2707         for (laddr = stcb->asoc.last_used_address; laddr;
2708             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2709                 if (laddr->ifa == NULL) {
2710                         /* address has been removed */
2711                         continue;
2712                 }
2713                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2714                         /* address is being deleted */
2715                         continue;
2716                 }
2717                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2718                 if (sifa == NULL)
2719                         continue;
2720                 if (((non_asoc_addr_ok == 0) &&
2721                     (sctp_is_addr_restricted(stcb, sifa))) ||
2722                     (non_asoc_addr_ok &&
2723                     (sctp_is_addr_restricted(stcb, sifa)) &&
2724                     (!sctp_is_addr_pending(stcb, sifa)))) {
2725                         /* on the no-no list */
2726                         continue;
2727                 }
2728                 stcb->asoc.last_used_address = laddr;
2729                 atomic_add_int(&sifa->refcount, 1);
2730                 return (sifa);
2731         }
2732         if (start_at_beginning == 0) {
2733                 stcb->asoc.last_used_address = NULL;
2734                 goto sctp_from_the_top;
2735         }
2736         /* now try for any higher scope than the destination */
2737         stcb->asoc.last_used_address = starting_point;
2738         start_at_beginning = 0;
2739 sctp_from_the_top2:
2740         if (stcb->asoc.last_used_address == NULL) {
2741                 start_at_beginning = 1;
2742                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2743         }
2744         /* search beginning with the last used address */
2745         for (laddr = stcb->asoc.last_used_address; laddr;
2746             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2747                 if (laddr->ifa == NULL) {
2748                         /* address has been removed */
2749                         continue;
2750                 }
2751                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2752                         /* address is being deleted */
2753                         continue;
2754                 }
2755                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2756                     dest_is_priv, fam);
2757                 if (sifa == NULL)
2758                         continue;
2759                 if (((non_asoc_addr_ok == 0) &&
2760                     (sctp_is_addr_restricted(stcb, sifa))) ||
2761                     (non_asoc_addr_ok &&
2762                     (sctp_is_addr_restricted(stcb, sifa)) &&
2763                     (!sctp_is_addr_pending(stcb, sifa)))) {
2764                         /* on the no-no list */
2765                         continue;
2766                 }
2767                 stcb->asoc.last_used_address = laddr;
2768                 atomic_add_int(&sifa->refcount, 1);
2769                 return (sifa);
2770         }
2771         if (start_at_beginning == 0) {
2772                 stcb->asoc.last_used_address = NULL;
2773                 goto sctp_from_the_top2;
2774         }
2775         return (NULL);
2776 }
2777
2778 static struct sctp_ifa *
2779 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2780     struct sctp_inpcb *inp,
2781     struct sctp_tcb *stcb,
2782     int non_asoc_addr_ok,
2783     uint8_t dest_is_loop,
2784     uint8_t dest_is_priv,
2785     int addr_wanted,
2786     sa_family_t fam,
2787     sctp_route_t *ro
2788 )
2789 {
2790         struct sctp_ifa *ifa, *sifa;
2791         int num_eligible_addr = 0;
2792 #ifdef INET6
2793         struct sockaddr_in6 sin6, lsa6;
2794
2795         if (fam == AF_INET6) {
2796                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2797                 (void)sa6_recoverscope(&sin6);
2798         }
2799 #endif                          /* INET6 */
2800         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2801 #ifdef INET
2802                 if ((ifa->address.sa.sa_family == AF_INET) &&
2803                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2804                     &ifa->address.sin.sin_addr) != 0)) {
2805                         continue;
2806                 }
2807 #endif
2808 #ifdef INET6
2809                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2810                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2811                     &ifa->address.sin6.sin6_addr) != 0)) {
2812                         continue;
2813                 }
2814 #endif
2815                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2816                     (non_asoc_addr_ok == 0))
2817                         continue;
2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819                     dest_is_priv, fam);
2820                 if (sifa == NULL)
2821                         continue;
2822 #ifdef INET6
2823                 if (fam == AF_INET6 &&
2824                     dest_is_loop &&
2825                     sifa->src_is_loop && sifa->src_is_priv) {
2826                         /*
2827                          * don't allow fe80::1 to be a src on loop ::1, we
2828                          * don't list it to the peer so we will get an
2829                          * abort.
2830                          */
2831                         continue;
2832                 }
2833                 if (fam == AF_INET6 &&
2834                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2835                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2836                         /*
2837                          * link-local <-> link-local must belong to the same
2838                          * scope.
2839                          */
2840                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2841                         (void)sa6_recoverscope(&lsa6);
2842                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2843                                 continue;
2844                         }
2845                 }
2846 #endif                          /* INET6 */
2847
2848                 /*
2849                  * Check if the IPv6 address matches to next-hop. In the
2850                  * mobile case, old IPv6 address may be not deleted from the
2851                  * interface. Then, the interface has previous and new
2852                  * addresses.  We should use one corresponding to the
2853                  * next-hop.  (by micchie)
2854                  */
2855 #ifdef INET6
2856                 if (stcb && fam == AF_INET6 &&
2857                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2858                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2859                             == 0) {
2860                                 continue;
2861                         }
2862                 }
2863 #endif
2864 #ifdef INET
2865                 /* Avoid topologically incorrect IPv4 address */
2866                 if (stcb && fam == AF_INET &&
2867                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2868                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2869                                 continue;
2870                         }
2871                 }
2872 #endif
2873                 if (stcb) {
2874                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2875                                 continue;
2876                         }
2877                         if (((non_asoc_addr_ok == 0) &&
2878                             (sctp_is_addr_restricted(stcb, sifa))) ||
2879                             (non_asoc_addr_ok &&
2880                             (sctp_is_addr_restricted(stcb, sifa)) &&
2881                             (!sctp_is_addr_pending(stcb, sifa)))) {
2882                                 /*
2883                                  * It is restricted for some reason..
2884                                  * probably not yet added.
2885                                  */
2886                                 continue;
2887                         }
2888                 }
2889                 if (num_eligible_addr >= addr_wanted) {
2890                         return (sifa);
2891                 }
2892                 num_eligible_addr++;
2893         }
2894         return (NULL);
2895 }
2896
2897
2898 static int
2899 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2900     struct sctp_inpcb *inp,
2901     struct sctp_tcb *stcb,
2902     int non_asoc_addr_ok,
2903     uint8_t dest_is_loop,
2904     uint8_t dest_is_priv,
2905     sa_family_t fam)
2906 {
2907         struct sctp_ifa *ifa, *sifa;
2908         int num_eligible_addr = 0;
2909
2910         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2911 #ifdef INET
2912                 if ((ifa->address.sa.sa_family == AF_INET) &&
2913                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2914                     &ifa->address.sin.sin_addr) != 0)) {
2915                         continue;
2916                 }
2917 #endif
2918 #ifdef INET6
2919                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2920                     (stcb != NULL) &&
2921                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2922                     &ifa->address.sin6.sin6_addr) != 0)) {
2923                         continue;
2924                 }
2925 #endif
2926                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2927                     (non_asoc_addr_ok == 0)) {
2928                         continue;
2929                 }
2930                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2931                     dest_is_priv, fam);
2932                 if (sifa == NULL) {
2933                         continue;
2934                 }
2935                 if (stcb) {
2936                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2937                                 continue;
2938                         }
2939                         if (((non_asoc_addr_ok == 0) &&
2940                             (sctp_is_addr_restricted(stcb, sifa))) ||
2941                             (non_asoc_addr_ok &&
2942                             (sctp_is_addr_restricted(stcb, sifa)) &&
2943                             (!sctp_is_addr_pending(stcb, sifa)))) {
2944                                 /*
2945                                  * It is restricted for some reason..
2946                                  * probably not yet added.
2947                                  */
2948                                 continue;
2949                         }
2950                 }
2951                 num_eligible_addr++;
2952         }
2953         return (num_eligible_addr);
2954 }
2955
2956 static struct sctp_ifa *
2957 sctp_choose_boundall(struct sctp_inpcb *inp,
2958     struct sctp_tcb *stcb,
2959     struct sctp_nets *net,
2960     sctp_route_t *ro,
2961     uint32_t vrf_id,
2962     uint8_t dest_is_priv,
2963     uint8_t dest_is_loop,
2964     int non_asoc_addr_ok,
2965     sa_family_t fam)
2966 {
2967         int cur_addr_num = 0, num_preferred = 0;
2968         void *ifn;
2969         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2970         struct sctp_ifa *sctp_ifa, *sifa;
2971         uint32_t ifn_index;
2972         struct sctp_vrf *vrf;
2973 #ifdef INET
2974         int retried = 0;
2975 #endif
2976
2977         /*-
2978          * For boundall we can use any address in the association.
2979          * If non_asoc_addr_ok is set we can use any address (at least in
2980          * theory). So we look for preferred addresses first. If we find one,
2981          * we use it. Otherwise we next try to get an address on the
2982          * interface, which we should be able to do (unless non_asoc_addr_ok
2983          * is false and we are routed out that way). In these cases where we
2984          * can't use the address of the interface we go through all the
2985          * ifn's looking for an address we can use and fill that in. Punting
2986          * means we send back address 0, which will probably cause problems
2987          * actually since then IP will fill in the address of the route ifn,
2988          * which means we probably already rejected it.. i.e. here comes an
2989          * abort :-<.
2990          */
2991         vrf = sctp_find_vrf(vrf_id);
2992         if (vrf == NULL)
2993                 return (NULL);
2994
2995         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2996         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2997         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2998         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2999         if (sctp_ifn == NULL) {
3000                 /* ?? We don't have this guy ?? */
3001                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3002                 goto bound_all_plan_b;
3003         }
3004         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3005             ifn_index, sctp_ifn->ifn_name);
3006
3007         if (net) {
3008                 cur_addr_num = net->indx_of_eligible_next_to_use;
3009         }
3010         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3011             inp, stcb,
3012             non_asoc_addr_ok,
3013             dest_is_loop,
3014             dest_is_priv, fam);
3015         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3016             num_preferred, sctp_ifn->ifn_name);
3017         if (num_preferred == 0) {
3018                 /*
3019                  * no eligible addresses, we must use some other interface
3020                  * address if we can find one.
3021                  */
3022                 goto bound_all_plan_b;
3023         }
3024         /*
3025          * Ok we have num_eligible_addr set with how many we can use, this
3026          * may vary from call to call due to addresses being deprecated
3027          * etc..
3028          */
3029         if (cur_addr_num >= num_preferred) {
3030                 cur_addr_num = 0;
3031         }
3032         /*
3033          * select the nth address from the list (where cur_addr_num is the
3034          * nth) and 0 is the first one, 1 is the second one etc...
3035          */
3036         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3037
3038         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3039             dest_is_priv, cur_addr_num, fam, ro);
3040
3041         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3042         if (sctp_ifa) {
3043                 atomic_add_int(&sctp_ifa->refcount, 1);
3044                 if (net) {
3045                         /* save off where the next one we will want */
3046                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3047                 }
3048                 return (sctp_ifa);
3049         }
3050         /*
3051          * plan_b: Look at all interfaces and find a preferred address. If
3052          * no preferred fall through to plan_c.
3053          */
3054 bound_all_plan_b:
3055         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3056         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3057                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3058                     sctp_ifn->ifn_name);
3059                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3060                         /* wrong base scope */
3061                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3062                         continue;
3063                 }
3064                 if ((sctp_ifn == looked_at) && looked_at) {
3065                         /* already looked at this guy */
3066                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3067                         continue;
3068                 }
3069                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3070                     dest_is_loop, dest_is_priv, fam);
3071                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3072                     "Found ifn:%p %d preferred source addresses\n",
3073                     ifn, num_preferred);
3074                 if (num_preferred == 0) {
3075                         /* None on this interface. */
3076                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3077                         continue;
3078                 }
3079                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3080                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3081                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3082
3083                 /*
3084                  * Ok we have num_eligible_addr set with how many we can
3085                  * use, this may vary from call to call due to addresses
3086                  * being deprecated etc..
3087                  */
3088                 if (cur_addr_num >= num_preferred) {
3089                         cur_addr_num = 0;
3090                 }
3091                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3092                     dest_is_priv, cur_addr_num, fam, ro);
3093                 if (sifa == NULL)
3094                         continue;
3095                 if (net) {
3096                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3098                             cur_addr_num);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3101                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3102                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3103                 }
3104                 atomic_add_int(&sifa->refcount, 1);
3105                 return (sifa);
3106         }
3107 #ifdef INET
3108 again_with_private_addresses_allowed:
3109 #endif
3110         /* plan_c: do we have an acceptable address on the emit interface */
3111         sifa = NULL;
3112         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3113         if (emit_ifn == NULL) {
3114                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3115                 goto plan_d;
3116         }
3117         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3118                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3119 #ifdef INET
3120                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3121                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3122                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3123                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3124                         continue;
3125                 }
3126 #endif
3127 #ifdef INET6
3128                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3129                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3130                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3132                         continue;
3133                 }
3134 #endif
3135                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3136                     (non_asoc_addr_ok == 0)) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3138                         continue;
3139                 }
3140                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3141                     dest_is_priv, fam);
3142                 if (sifa == NULL) {
3143                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3144                         continue;
3145                 }
3146                 if (stcb) {
3147                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3148                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3149                                 sifa = NULL;
3150                                 continue;
3151                         }
3152                         if (((non_asoc_addr_ok == 0) &&
3153                             (sctp_is_addr_restricted(stcb, sifa))) ||
3154                             (non_asoc_addr_ok &&
3155                             (sctp_is_addr_restricted(stcb, sifa)) &&
3156                             (!sctp_is_addr_pending(stcb, sifa)))) {
3157                                 /*
3158                                  * It is restricted for some reason..
3159                                  * probably not yet added.
3160                                  */
3161                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3162                                 sifa = NULL;
3163                                 continue;
3164                         }
3165                 }
3166                 atomic_add_int(&sifa->refcount, 1);
3167                 goto out;
3168         }
3169 plan_d:
3170         /*
3171          * plan_d: We are in trouble. No preferred address on the emit
3172          * interface. And not even a preferred address on all interfaces. Go
3173          * out and see if we can find an acceptable address somewhere
3174          * amongst all interfaces.
3175          */
3176         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179                         /* wrong base scope */
3180                         continue;
3181                 }
3182                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183 #ifdef INET
3184                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3187                                 continue;
3188                         }
3189 #endif
3190 #ifdef INET6
3191                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194                                 continue;
3195                         }
3196 #endif
3197                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198                             (non_asoc_addr_ok == 0))
3199                                 continue;
3200                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201                             dest_is_loop,
3202                             dest_is_priv, fam);
3203                         if (sifa == NULL)
3204                                 continue;
3205                         if (stcb) {
3206                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207                                         sifa = NULL;
3208                                         continue;
3209                                 }
3210                                 if (((non_asoc_addr_ok == 0) &&
3211                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3212                                     (non_asoc_addr_ok &&
3213                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3214                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3215                                         /*
3216                                          * It is restricted for some
3217                                          * reason.. probably not yet added.
3218                                          */
3219                                         sifa = NULL;
3220                                         continue;
3221                                 }
3222                         }
3223                         goto out;
3224                 }
3225         }
3226 #ifdef INET
3227         if (stcb) {
3228                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3229                         stcb->asoc.scope.ipv4_local_scope = 1;
3230                         retried = 1;
3231                         goto again_with_private_addresses_allowed;
3232                 } else if (retried == 1) {
3233                         stcb->asoc.scope.ipv4_local_scope = 0;
3234                 }
3235         }
3236 #endif
3237 out:
3238 #ifdef INET
3239         if (sifa) {
3240                 if (retried == 1) {
3241                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3242                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3243                                         /* wrong base scope */
3244                                         continue;
3245                                 }
3246                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3247                                         struct sctp_ifa *tmp_sifa;
3248
3249 #ifdef INET
3250                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3251                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3252                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3253                                                 continue;
3254                                         }
3255 #endif
3256 #ifdef INET6
3257                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3258                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3259                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3260                                                 continue;
3261                                         }
3262 #endif
3263                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3264                                             (non_asoc_addr_ok == 0))
3265                                                 continue;
3266                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3267                                             dest_is_loop,
3268                                             dest_is_priv, fam);
3269                                         if (tmp_sifa == NULL) {
3270                                                 continue;
3271                                         }
3272                                         if (tmp_sifa == sifa) {
3273                                                 continue;
3274                                         }
3275                                         if (stcb) {
3276                                                 if (sctp_is_address_in_scope(tmp_sifa,
3277                                                     &stcb->asoc.scope, 0) == 0) {
3278                                                         continue;
3279                                                 }
3280                                                 if (((non_asoc_addr_ok == 0) &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3282                                                     (non_asoc_addr_ok &&
3283                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3284                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3285                                                         /*
3286                                                          * It is restricted
3287                                                          * for some reason..
3288                                                          * probably not yet
3289                                                          * added.
3290                                                          */
3291                                                         continue;
3292                                                 }
3293                                         }
3294                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3295                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3296                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3297                                         }
3298                                 }
3299                         }
3300                 }
3301                 atomic_add_int(&sifa->refcount, 1);
3302         }
3303 #endif
3304         return (sifa);
3305 }
3306
3307
3308
3309 /* tcb may be NULL */
3310 struct sctp_ifa *
3311 sctp_source_address_selection(struct sctp_inpcb *inp,
3312     struct sctp_tcb *stcb,
3313     sctp_route_t *ro,
3314     struct sctp_nets *net,
3315     int non_asoc_addr_ok, uint32_t vrf_id)
3316 {
3317         struct sctp_ifa *answer;
3318         uint8_t dest_is_priv, dest_is_loop;
3319         sa_family_t fam;
3320 #ifdef INET
3321         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325 #endif
3326
3327         /**
3328          * Rules:
3329          * - Find the route if needed, cache if I can.
3330          * - Look at interface address in route, Is it in the bound list. If so we
3331          *   have the best source.
3332          * - If not we must rotate amongst the addresses.
3333          *
3334          * Cavets and issues
3335          *
3336          * Do we need to pay attention to scope. We can have a private address
3337          * or a global address we are sourcing or sending to. So if we draw
3338          * it out
3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340          * For V4
3341          * ------------------------------------------
3342          *      source     *      dest  *  result
3343          * -----------------------------------------
3344          * <a>  Private    *    Global  *  NAT
3345          * -----------------------------------------
3346          * <b>  Private    *    Private *  No problem
3347          * -----------------------------------------
3348          * <c>  Global     *    Private *  Huh, How will this work?
3349          * -----------------------------------------
3350          * <d>  Global     *    Global  *  No Problem
3351          *------------------------------------------
3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353          * For V6
3354          *------------------------------------------
3355          *      source     *      dest  *  result
3356          * -----------------------------------------
3357          * <a>  Linklocal  *    Global  *
3358          * -----------------------------------------
3359          * <b>  Linklocal  * Linklocal  *  No problem
3360          * -----------------------------------------
3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
3362          * -----------------------------------------
3363          * <d>  Global     *    Global  *  No Problem
3364          *------------------------------------------
3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366          *
3367          * And then we add to that what happens if there are multiple addresses
3368          * assigned to an interface. Remember the ifa on a ifn is a linked
3369          * list of addresses. So one interface can have more than one IP
3370          * address. What happens if we have both a private and a global
3371          * address? Do we then use context of destination to sort out which
3372          * one is best? And what about NAT's sending P->G may get you a NAT
3373          * translation, or should you select the G thats on the interface in
3374          * preference.
3375          *
3376          * Decisions:
3377          *
3378          * - count the number of addresses on the interface.
3379          * - if it is one, no problem except case <c>.
3380          *   For <a> we will assume a NAT out there.
3381          * - if there are more than one, then we need to worry about scope P
3382          *   or G. We should prefer G -> G and P -> P if possible.
3383          *   Then as a secondary fall back to mixed types G->P being a last
3384          *   ditch one.
3385          * - The above all works for bound all, but bound specific we need to
3386          *   use the same concept but instead only consider the bound
3387          *   addresses. If the bound set is NOT assigned to the interface then
3388          *   we must use rotation amongst the bound addresses..
3389          */
3390         if (ro->ro_rt == NULL) {
3391                 /*
3392                  * Need a route to cache.
3393                  */
3394                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3395         }
3396         if (ro->ro_rt == NULL) {
3397                 return (NULL);
3398         }
3399         fam = ro->ro_dst.sa_family;
3400         dest_is_priv = dest_is_loop = 0;
3401         /* Setup our scopes for the destination */
3402         switch (fam) {
3403 #ifdef INET
3404         case AF_INET:
3405                 /* Scope based on outbound address */
3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407                         dest_is_loop = 1;
3408                         if (net != NULL) {
3409                                 /* mark it as local */
3410                                 net->addr_is_local = 1;
3411                         }
3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413                         dest_is_priv = 1;
3414                 }
3415                 break;
3416 #endif
3417 #ifdef INET6
3418         case AF_INET6:
3419                 /* Scope based on outbound address */
3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422                         /*
3423                          * If the address is a loopback address, which
3424                          * consists of "::1" OR "fe80::1%lo0", we are
3425                          * loopback scope. But we don't use dest_is_priv
3426                          * (link local addresses).
3427                          */
3428                         dest_is_loop = 1;
3429                         if (net != NULL) {
3430                                 /* mark it as local */
3431                                 net->addr_is_local = 1;
3432                         }
3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434                         dest_is_priv = 1;
3435                 }
3436                 break;
3437 #endif
3438         }
3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441         SCTP_IPI_ADDR_RLOCK();
3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443                 /*
3444                  * Bound all case
3445                  */
3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447                     dest_is_priv, dest_is_loop,
3448                     non_asoc_addr_ok, fam);
3449                 SCTP_IPI_ADDR_RUNLOCK();
3450                 return (answer);
3451         }
3452         /*
3453          * Subset bound case
3454          */
3455         if (stcb) {
3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457                     vrf_id, dest_is_priv,
3458                     dest_is_loop,
3459                     non_asoc_addr_ok, fam);
3460         } else {
3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462                     non_asoc_addr_ok,
3463                     dest_is_priv,
3464                     dest_is_loop, fam);
3465         }
3466         SCTP_IPI_ADDR_RUNLOCK();
3467         return (answer);
3468 }
3469
3470 static int
3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472 {
3473         struct cmsghdr cmh;
3474         struct sctp_sndinfo sndinfo;
3475         struct sctp_prinfo prinfo;
3476         struct sctp_authinfo authinfo;
3477         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3478         int found;
3479
3480         /*
3481          * Independent of how many mbufs, find the c_type inside the control
3482          * structure and copy out the data.
3483          */
3484         found = 0;
3485         tot_len = SCTP_BUF_LEN(control);
3486         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3487                 rem_len = tot_len - off;
3488                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3489                         /* There is not enough room for one more. */
3490                         return (found);
3491                 }
3492                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494                         /* We dont't have a complete CMSG header. */
3495                         return (found);
3496                 }
3497                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3498                         /* We don't have the complete CMSG. */
3499                         return (found);
3500                 }
3501                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3502                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3503                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3504                     ((c_type == cmh.cmsg_type) ||
3505                     ((c_type == SCTP_SNDRCV) &&
3506                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3507                     (cmh.cmsg_type == SCTP_PRINFO) ||
3508                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3509                         if (c_type == cmh.cmsg_type) {
3510                                 if (cpsize > INT_MAX) {
3511                                         return (found);
3512                                 }
3513                                 if (cmsg_data_len < (int)cpsize) {
3514                                         return (found);
3515                                 }
3516                                 /* It is exactly what we want. Copy it out. */
3517                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3518                                 return (1);
3519                         } else {
3520                                 struct sctp_sndrcvinfo *sndrcvinfo;
3521
3522                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3523                                 if (found == 0) {
3524                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3525                                                 return (found);
3526                                         }
3527                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3528                                 }
3529                                 switch (cmh.cmsg_type) {
3530                                 case SCTP_SNDINFO:
3531                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3532                                                 return (found);
3533                                         }
3534                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3535                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3536                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3537                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3538                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3539                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3540                                         break;
3541                                 case SCTP_PRINFO:
3542                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3546                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3547                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3548                                         } else {
3549                                                 sndrcvinfo->sinfo_timetolive = 0;
3550                                         }
3551                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3552                                         break;
3553                                 case SCTP_AUTHINFO:
3554                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3555                                                 return (found);
3556                                         }
3557                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3558                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3559                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3560                                         break;
3561                                 default:
3562                                         return (found);
3563                                 }
3564                                 found = 1;
3565                         }
3566                 }
3567         }
3568         return (found);
3569 }
3570
3571 static int
3572 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3573 {
3574         struct cmsghdr cmh;
3575         struct sctp_initmsg initmsg;
3576 #ifdef INET
3577         struct sockaddr_in sin;
3578 #endif
3579 #ifdef INET6
3580         struct sockaddr_in6 sin6;
3581 #endif
3582         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3583
3584         tot_len = SCTP_BUF_LEN(control);
3585         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3586                 rem_len = tot_len - off;
3587                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3588                         /* There is not enough room for one more. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3593                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3594                         /* We dont't have a complete CMSG header. */
3595                         *error = EINVAL;
3596                         return (1);
3597                 }
3598                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3599                         /* We don't have the complete CMSG. */
3600                         *error = EINVAL;
3601                         return (1);
3602                 }
3603                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3604                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3605                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3606                         switch (cmh.cmsg_type) {
3607                         case SCTP_INIT:
3608                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3609                                         *error = EINVAL;
3610                                         return (1);
3611                                 }
3612                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3613                                 if (initmsg.sinit_max_attempts)
3614                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3615                                 if (initmsg.sinit_num_ostreams)
3616                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3617                                 if (initmsg.sinit_max_instreams)
3618                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3619                                 if (initmsg.sinit_max_init_timeo)
3620                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3621                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3622                                         struct sctp_stream_out *tmp_str;
3623                                         unsigned int i;
3624 #if defined(SCTP_DETAILED_STR_STATS)
3625                                         int j;
3626 #endif
3627
3628                                         /* Default is NOT correct */
3629                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3630                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3631                                         SCTP_TCB_UNLOCK(stcb);
3632                                         SCTP_MALLOC(tmp_str,
3633                                             struct sctp_stream_out *,
3634                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3635                                             SCTP_M_STRMO);
3636                                         SCTP_TCB_LOCK(stcb);
3637                                         if (tmp_str != NULL) {
3638                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3639                                                 stcb->asoc.strmout = tmp_str;
3640                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3641                                         } else {
3642                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3643                                         }
3644                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3645                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3646                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3647                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3648                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3649 #if defined(SCTP_DETAILED_STR_STATS)
3650                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3651                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3652                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3653                                                 }
3654 #else
3655                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3656                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3657 #endif
3658                                                 stcb->asoc.strmout[i].sid = i;
3659                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3660                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3661                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3662                                         }
3663                                 }
3664                                 break;
3665 #ifdef INET
3666                         case SCTP_DSTADDRV4:
3667                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3668                                         *error = EINVAL;
3669                                         return (1);
3670                                 }
3671                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3672                                 sin.sin_family = AF_INET;
3673                                 sin.sin_len = sizeof(struct sockaddr_in);
3674                                 sin.sin_port = stcb->rport;
3675                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3676                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3677                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3678                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3683                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3684                                         *error = ENOBUFS;
3685                                         return (1);
3686                                 }
3687                                 break;
3688 #endif
3689 #ifdef INET6
3690                         case SCTP_DSTADDRV6:
3691                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3692                                         *error = EINVAL;
3693                                         return (1);
3694                                 }
3695                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3696                                 sin6.sin6_family = AF_INET6;
3697                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3698                                 sin6.sin6_port = stcb->rport;
3699                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3700                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3701                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3702                                         *error = EINVAL;
3703                                         return (1);
3704                                 }
3705 #ifdef INET
3706                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3707                                         in6_sin6_2_sin(&sin, &sin6);
3708                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3709                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3710                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3711                                                 *error = EINVAL;
3712                                                 return (1);
3713                                         }
3714                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3715                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3716                                                 *error = ENOBUFS;
3717                                                 return (1);
3718                                         }
3719                                 } else
3720 #endif
3721                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3722                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3723                                         *error = ENOBUFS;
3724                                         return (1);
3725                                 }
3726                                 break;
3727 #endif
3728                         default:
3729                                 break;
3730                         }
3731                 }
3732         }
3733         return (0);
3734 }
3735
3736 #if defined(INET) || defined(INET6)
3737 static struct sctp_tcb *
3738 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3739     uint16_t port,
3740     struct mbuf *control,
3741     struct sctp_nets **net_p,
3742     int *error)
3743 {
3744         struct cmsghdr cmh;
3745         struct sctp_tcb *stcb;
3746         struct sockaddr *addr;
3747 #ifdef INET
3748         struct sockaddr_in sin;
3749 #endif
3750 #ifdef INET6
3751         struct sockaddr_in6 sin6;
3752 #endif
3753         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3754
3755         tot_len = SCTP_BUF_LEN(control);
3756         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3757                 rem_len = tot_len - off;
3758                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3759                         /* There is not enough room for one more. */
3760                         *error = EINVAL;
3761                         return (NULL);
3762                 }
3763                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3764                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3765                         /* We dont't have a complete CMSG header. */
3766                         *error = EINVAL;
3767                         return (NULL);
3768                 }
3769                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3770                         /* We don't have the complete CMSG. */
3771                         *error = EINVAL;
3772                         return (NULL);
3773                 }
3774                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3775                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3776                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3777                         switch (cmh.cmsg_type) {
3778 #ifdef INET
3779                         case SCTP_DSTADDRV4:
3780                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3781                                         *error = EINVAL;
3782                                         return (NULL);
3783                                 }
3784                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3785                                 sin.sin_family = AF_INET;
3786                                 sin.sin_len = sizeof(struct sockaddr_in);
3787                                 sin.sin_port = port;
3788                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3789                                 addr = (struct sockaddr *)&sin;
3790                                 break;
3791 #endif
3792 #ifdef INET6
3793                         case SCTP_DSTADDRV6:
3794                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3795                                         *error = EINVAL;
3796                                         return (NULL);
3797                                 }
3798                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3799                                 sin6.sin6_family = AF_INET6;
3800                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3801                                 sin6.sin6_port = port;
3802                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3803 #ifdef INET
3804                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3805                                         in6_sin6_2_sin(&sin, &sin6);
3806                                         addr = (struct sockaddr *)&sin;
3807                                 } else
3808 #endif
3809                                         addr = (struct sockaddr *)&sin6;
3810                                 break;
3811 #endif
3812                         default:
3813                                 addr = NULL;
3814                                 break;
3815                         }
3816                         if (addr) {
3817                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3818                                 if (stcb != NULL) {
3819                                         return (stcb);
3820                                 }
3821                         }
3822                 }
3823         }
3824         return (NULL);
3825 }
3826 #endif
3827
3828 static struct mbuf *
3829 sctp_add_cookie(struct mbuf *init, int init_offset,
3830     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3831 {
3832         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3833         struct sctp_state_cookie *stc;
3834         struct sctp_paramhdr *ph;
3835         uint8_t *foo;
3836         int sig_offset;
3837         uint16_t cookie_sz;
3838
3839         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3840             sizeof(struct sctp_paramhdr)), 0,
3841             M_NOWAIT, 1, MT_DATA);
3842         if (mret == NULL) {
3843                 return (NULL);
3844         }
3845         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3846         if (copy_init == NULL) {
3847                 sctp_m_freem(mret);
3848                 return (NULL);
3849         }
3850 #ifdef SCTP_MBUF_LOGGING
3851         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3852                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3853         }
3854 #endif
3855         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3856             M_NOWAIT);
3857         if (copy_initack == NULL) {
3858                 sctp_m_freem(mret);
3859                 sctp_m_freem(copy_init);
3860                 return (NULL);
3861         }
3862 #ifdef SCTP_MBUF_LOGGING
3863         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3864                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3865         }
3866 #endif
3867         /* easy side we just drop it on the end */
3868         ph = mtod(mret, struct sctp_paramhdr *);
3869         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3870             sizeof(struct sctp_paramhdr);
3871         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3872             sizeof(struct sctp_paramhdr));
3873         ph->param_type = htons(SCTP_STATE_COOKIE);
3874         ph->param_length = 0;   /* fill in at the end */
3875         /* Fill in the stc cookie data */
3876         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3877
3878         /* tack the INIT and then the INIT-ACK onto the chain */
3879         cookie_sz = 0;
3880         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881                 cookie_sz += SCTP_BUF_LEN(m_at);
3882                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3883                         SCTP_BUF_NEXT(m_at) = copy_init;
3884                         break;
3885                 }
3886         }
3887         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888                 cookie_sz += SCTP_BUF_LEN(m_at);
3889                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3890                         SCTP_BUF_NEXT(m_at) = copy_initack;
3891                         break;
3892                 }
3893         }
3894         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3895                 cookie_sz += SCTP_BUF_LEN(m_at);
3896                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3897                         break;
3898                 }
3899         }
3900         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3901         if (sig == NULL) {
3902                 /* no space, so free the entire chain */
3903                 sctp_m_freem(mret);
3904                 return (NULL);
3905         }
3906         SCTP_BUF_LEN(sig) = 0;
3907         SCTP_BUF_NEXT(m_at) = sig;
3908         sig_offset = 0;
3909         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3910         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3911         *signature = foo;
3912         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3913         cookie_sz += SCTP_SIGNATURE_SIZE;
3914         ph->param_length = htons(cookie_sz);
3915         return (mret);
3916 }
3917
3918
3919 static uint8_t
3920 sctp_get_ect(struct sctp_tcb *stcb)
3921 {
3922         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3923                 return (SCTP_ECT0_BIT);
3924         } else {
3925                 return (0);
3926         }
3927 }
3928
3929 #if defined(INET) || defined(INET6)
3930 static void
3931 sctp_handle_no_route(struct sctp_tcb *stcb,
3932     struct sctp_nets *net,
3933     int so_locked)
3934 {
3935         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3936
3937         if (net) {
3938                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3939                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3940                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3941                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3942                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3943                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3944                                     stcb, 0,
3945                                     (void *)net,
3946                                     so_locked);
3947                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3948                                 net->dest_state &= ~SCTP_ADDR_PF;
3949                         }
3950                 }
3951                 if (stcb) {
3952                         if (net == stcb->asoc.primary_destination) {
3953                                 /* need a new primary */
3954                                 struct sctp_nets *alt;
3955
3956                                 alt = sctp_find_alternate_net(stcb, net, 0);
3957                                 if (alt != net) {
3958                                         if (stcb->asoc.alternate) {
3959                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3960                                         }
3961                                         stcb->asoc.alternate = alt;
3962                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3963                                         if (net->ro._s_addr) {
3964                                                 sctp_free_ifa(net->ro._s_addr);
3965                                                 net->ro._s_addr = NULL;
3966                                         }
3967                                         net->src_addr_selected = 0;
3968                                 }
3969                         }
3970                 }
3971         }
3972 }
3973 #endif
3974
3975 static int
3976 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3977     struct sctp_tcb *stcb,      /* may be NULL */
3978     struct sctp_nets *net,
3979     struct sockaddr *to,
3980     struct mbuf *m,
3981     uint32_t auth_offset,
3982     struct sctp_auth_chunk *auth,
3983     uint16_t auth_keyid,
3984     int nofragment_flag,
3985     int ecn_ok,
3986     int out_of_asoc_ok,
3987     uint16_t src_port,
3988     uint16_t dest_port,
3989     uint32_t v_tag,
3990     uint16_t port,
3991     union sctp_sockstore *over_addr,
3992     uint8_t mflowtype, uint32_t mflowid,
3993 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3994     int so_locked SCTP_UNUSED
3995 #else
3996     int so_locked
3997 #endif
3998 )
3999 {
4000 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4001         /**
4002          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4003          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4004          * - fill in the HMAC digest of any AUTH chunk in the packet.
4005          * - calculate and fill in the SCTP checksum.
4006          * - prepend an IP address header.
4007          * - if boundall use INADDR_ANY.
4008          * - if boundspecific do source address selection.
4009          * - set fragmentation option for ipV4.
4010          * - On return from IP output, check/adjust mtu size of output
4011          *   interface and smallest_mtu size as well.
4012          */
4013         /* Will need ifdefs around this */
4014         struct mbuf *newm;
4015         struct sctphdr *sctphdr;
4016         int packet_length;
4017         int ret;
4018 #if defined(INET) || defined(INET6)
4019         uint32_t vrf_id;
4020 #endif
4021 #if defined(INET) || defined(INET6)
4022         struct mbuf *o_pak;
4023         sctp_route_t *ro = NULL;
4024         struct udphdr *udp = NULL;
4025 #endif
4026         uint8_t tos_value;
4027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028         struct socket *so = NULL;
4029 #endif
4030
4031         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4032                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4033                 sctp_m_freem(m);
4034                 return (EFAULT);
4035         }
4036 #if defined(INET) || defined(INET6)
4037         if (stcb) {
4038                 vrf_id = stcb->asoc.vrf_id;
4039         } else {
4040                 vrf_id = inp->def_vrf_id;
4041         }
4042 #endif
4043         /* fill in the HMAC digest for any AUTH chunk in the packet */
4044         if ((auth != NULL) && (stcb != NULL)) {
4045                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4046         }
4047
4048         if (net) {
4049                 tos_value = net->dscp;
4050         } else if (stcb) {
4051                 tos_value = stcb->asoc.default_dscp;
4052         } else {
4053                 tos_value = inp->sctp_ep.default_dscp;
4054         }
4055
4056         switch (to->sa_family) {
4057 #ifdef INET
4058         case AF_INET:
4059                 {
4060                         struct ip *ip = NULL;
4061                         sctp_route_t iproute;
4062                         int len;
4063
4064                         len = SCTP_MIN_V4_OVERHEAD;
4065                         if (port) {
4066                                 len += sizeof(struct udphdr);
4067                         }
4068                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069                         if (newm == NULL) {
4070                                 sctp_m_freem(m);
4071                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072                                 return (ENOMEM);
4073                         }
4074                         SCTP_ALIGN_TO_END(newm, len);
4075                         SCTP_BUF_LEN(newm) = len;
4076                         SCTP_BUF_NEXT(newm) = m;
4077                         m = newm;
4078                         if (net != NULL) {
4079                                 m->m_pkthdr.flowid = net->flowid;
4080                                 M_HASHTYPE_SET(m, net->flowtype);
4081                         } else {
4082                                 m->m_pkthdr.flowid = mflowid;
4083                                 M_HASHTYPE_SET(m, mflowtype);
4084                         }
4085                         packet_length = sctp_calculate_len(m);
4086                         ip = mtod(m, struct ip *);
4087                         ip->ip_v = IPVERSION;
4088                         ip->ip_hl = (sizeof(struct ip) >> 2);
4089                         if (tos_value == 0) {
4090                                 /*
4091                                  * This means especially, that it is not set
4092                                  * at the SCTP layer. So use the value from
4093                                  * the IP layer.
4094                                  */
4095                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4096                         }
4097                         tos_value &= 0xfc;
4098                         if (ecn_ok) {
4099                                 tos_value |= sctp_get_ect(stcb);
4100                         }
4101                         if ((nofragment_flag) && (port == 0)) {
4102                                 ip->ip_off = htons(IP_DF);
4103                         } else {
4104                                 ip->ip_off = htons(0);
4105                         }
4106                         /* FreeBSD has a function for ip_id's */
4107                         ip_fillid(ip);
4108
4109                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4110                         ip->ip_len = htons(packet_length);
4111                         ip->ip_tos = tos_value;
4112                         if (port) {
4113                                 ip->ip_p = IPPROTO_UDP;
4114                         } else {
4115                                 ip->ip_p = IPPROTO_SCTP;
4116                         }
4117                         ip->ip_sum = 0;
4118                         if (net == NULL) {
4119                                 ro = &iproute;
4120                                 memset(&iproute, 0, sizeof(iproute));
4121                                 memcpy(&ro->ro_dst, to, to->sa_len);
4122                         } else {
4123                                 ro = (sctp_route_t *)&net->ro;
4124                         }
4125                         /* Now the address selection part */
4126                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4127
4128                         /* call the routine to select the src address */
4129                         if (net && out_of_asoc_ok == 0) {
4130                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4131                                         sctp_free_ifa(net->ro._s_addr);
4132                                         net->ro._s_addr = NULL;
4133                                         net->src_addr_selected = 0;
4134                                         if (ro->ro_rt) {
4135                                                 RTFREE(ro->ro_rt);
4136                                                 ro->ro_rt = NULL;
4137                                         }
4138                                 }
4139                                 if (net->src_addr_selected == 0) {
4140                                         /* Cache the source address */
4141                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4142                                             ro, net, 0,
4143                                             vrf_id);
4144                                         net->src_addr_selected = 1;
4145                                 }
4146                                 if (net->ro._s_addr == NULL) {
4147                                         /* No route to host */
4148                                         net->src_addr_selected = 0;
4149                                         sctp_handle_no_route(stcb, net, so_locked);
4150                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4151                                         sctp_m_freem(m);
4152                                         return (EHOSTUNREACH);
4153                                 }
4154                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4155                         } else {
4156                                 if (over_addr == NULL) {
4157                                         struct sctp_ifa *_lsrc;
4158
4159                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4160                                             net,
4161                                             out_of_asoc_ok,
4162                                             vrf_id);
4163                                         if (_lsrc == NULL) {
4164                                                 sctp_handle_no_route(stcb, net, so_locked);
4165                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4166                                                 sctp_m_freem(m);
4167                                                 return (EHOSTUNREACH);
4168                                         }
4169                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4170                                         sctp_free_ifa(_lsrc);
4171                                 } else {
4172                                         ip->ip_src = over_addr->sin.sin_addr;
4173                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4174                                 }
4175                         }
4176                         if (port) {
4177                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4178                                         sctp_handle_no_route(stcb, net, so_locked);
4179                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4180                                         sctp_m_freem(m);
4181                                         return (EHOSTUNREACH);
4182                                 }
4183                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4184                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4185                                 udp->uh_dport = port;
4186                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4187                                 if (V_udp_cksum) {
4188                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4189                                 } else {
4190                                         udp->uh_sum = 0;
4191                                 }
4192                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4193                         } else {
4194                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4195                         }
4196
4197                         sctphdr->src_port = src_port;
4198                         sctphdr->dest_port = dest_port;
4199                         sctphdr->v_tag = v_tag;
4200                         sctphdr->checksum = 0;
4201
4202                         /*
4203                          * If source address selection fails and we find no
4204                          * route then the ip_output should fail as well with
4205                          * a NO_ROUTE_TO_HOST type error. We probably should
4206                          * catch that somewhere and abort the association
4207                          * right away (assuming this is an INIT being sent).
4208                          */
4209                         if (ro->ro_rt == NULL) {
4210                                 /*
4211                                  * src addr selection failed to find a route
4212                                  * (or valid source addr), so we can't get
4213                                  * there from here (yet)!
4214                                  */
4215                                 sctp_handle_no_route(stcb, net, so_locked);
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4217                                 sctp_m_freem(m);
4218                                 return (EHOSTUNREACH);
4219                         }
4220                         if (ro != &iproute) {
4221                                 memcpy(&iproute, ro, sizeof(*ro));
4222                         }
4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4224                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4225                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4226                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4227                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4228                             (void *)ro->ro_rt);
4229
4230                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4231                                 /* failed to prepend data, give up */
4232                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4233                                 sctp_m_freem(m);
4234                                 return (ENOMEM);
4235                         }
4236                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4237                         if (port) {
4238                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4239                                 SCTP_STAT_INCR(sctps_sendswcrc);
4240                                 if (V_udp_cksum) {
4241                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4242                                 }
4243                         } else {
4244                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4245                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4246                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4247                         }
4248 #ifdef SCTP_PACKET_LOGGING
4249                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4250                                 sctp_packet_log(o_pak);
4251 #endif
4252                         /* send it out.  table id is taken from stcb */
4253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4254                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4255                                 so = SCTP_INP_SO(inp);
4256                                 SCTP_SOCKET_UNLOCK(so, 0);
4257                         }
4258 #endif
4259                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4260                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4262                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4263                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4264                                 SCTP_TCB_UNLOCK(stcb);
4265                                 SCTP_SOCKET_LOCK(so, 0);
4266                                 SCTP_TCB_LOCK(stcb);
4267                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4268                         }
4269 #endif
4270                         if (port) {
4271                                 UDPSTAT_INC(udps_opackets);
4272                         }
4273                         SCTP_STAT_INCR(sctps_sendpackets);
4274                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4275                         if (ret)
4276                                 SCTP_STAT_INCR(sctps_senderrors);
4277
4278                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4279                         if (net == NULL) {
4280                                 /* free tempy routes */
4281                                 RO_RTFREE(ro);
4282                         } else {
4283                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4284                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4285                                         uint32_t mtu;
4286
4287                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4288                                         if (mtu > 0) {
4289                                                 if (net->port) {
4290                                                         mtu -= sizeof(struct udphdr);
4291                                                 }
4292                                                 if (mtu < net->mtu) {
4293                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4294                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4295                                                         }
4296                                                         net->mtu = mtu;
4297                                                 }
4298                                         }
4299                                 } else if (ro->ro_rt == NULL) {
4300                                         /* route was freed */
4301                                         if (net->ro._s_addr &&
4302                                             net->src_addr_selected) {
4303                                                 sctp_free_ifa(net->ro._s_addr);
4304                                                 net->ro._s_addr = NULL;
4305                                         }
4306                                         net->src_addr_selected = 0;
4307                                 }
4308                         }
4309                         return (ret);
4310                 }
4311 #endif
4312 #ifdef INET6
4313         case AF_INET6:
4314                 {
4315                         uint32_t flowlabel, flowinfo;
4316                         struct ip6_hdr *ip6h;
4317                         struct route_in6 ip6route;
4318                         struct ifnet *ifp;
4319                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4320                         int prev_scope = 0;
4321                         struct sockaddr_in6 lsa6_storage;
4322                         int error;
4323                         u_short prev_port = 0;
4324                         int len;
4325
4326                         if (net) {
4327                                 flowlabel = net->flowlabel;
4328                         } else if (stcb) {
4329                                 flowlabel = stcb->asoc.default_flowlabel;
4330                         } else {
4331                                 flowlabel = inp->sctp_ep.default_flowlabel;
4332                         }
4333                         if (flowlabel == 0) {
4334                                 /*
4335                                  * This means especially, that it is not set
4336                                  * at the SCTP layer. So use the value from
4337                                  * the IP layer.
4338                                  */
4339                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4340                         }
4341                         flowlabel &= 0x000fffff;
4342                         len = SCTP_MIN_OVERHEAD;
4343                         if (port) {
4344                                 len += sizeof(struct udphdr);
4345                         }
4346                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4347                         if (newm == NULL) {
4348                                 sctp_m_freem(m);
4349                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4350                                 return (ENOMEM);
4351                         }
4352                         SCTP_ALIGN_TO_END(newm, len);
4353                         SCTP_BUF_LEN(newm) = len;
4354                         SCTP_BUF_NEXT(newm) = m;
4355                         m = newm;
4356                         if (net != NULL) {
4357                                 m->m_pkthdr.flowid = net->flowid;
4358                                 M_HASHTYPE_SET(m, net->flowtype);
4359                         } else {
4360                                 m->m_pkthdr.flowid = mflowid;
4361                                 M_HASHTYPE_SET(m, mflowtype);
4362                         }
4363                         packet_length = sctp_calculate_len(m);
4364
4365                         ip6h = mtod(m, struct ip6_hdr *);
4366                         /* protect *sin6 from overwrite */
4367                         sin6 = (struct sockaddr_in6 *)to;
4368                         tmp = *sin6;
4369                         sin6 = &tmp;
4370
4371                         /* KAME hack: embed scopeid */
4372                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4373                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4374                                 sctp_m_freem(m);
4375                                 return (EINVAL);
4376                         }
4377                         if (net == NULL) {
4378                                 memset(&ip6route, 0, sizeof(ip6route));
4379                                 ro = (sctp_route_t *)&ip6route;
4380                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4381                         } else {
4382                                 ro = (sctp_route_t *)&net->ro;
4383                         }
4384                         /*
4385                          * We assume here that inp_flow is in host byte
4386                          * order within the TCB!
4387                          */
4388                         if (tos_value == 0) {
4389                                 /*
4390                                  * This means especially, that it is not set
4391                                  * at the SCTP layer. So use the value from
4392                                  * the IP layer.
4393                                  */
4394                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4395                         }
4396                         tos_value &= 0xfc;
4397                         if (ecn_ok) {
4398                                 tos_value |= sctp_get_ect(stcb);
4399                         }
4400                         flowinfo = 0x06;
4401                         flowinfo <<= 8;
4402                         flowinfo |= tos_value;
4403                         flowinfo <<= 20;
4404                         flowinfo |= flowlabel;
4405                         ip6h->ip6_flow = htonl(flowinfo);
4406                         if (port) {
4407                                 ip6h->ip6_nxt = IPPROTO_UDP;
4408                         } else {
4409                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4410                         }
4411                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4412                         ip6h->ip6_dst = sin6->sin6_addr;
4413
4414                         /*
4415                          * Add SRC address selection here: we can only reuse
4416                          * to a limited degree the kame src-addr-sel, since
4417                          * we can try their selection but it may not be
4418                          * bound.
4419                          */
4420                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4421                         lsa6_tmp.sin6_family = AF_INET6;
4422                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4423                         lsa6 = &lsa6_tmp;
4424                         if (net && out_of_asoc_ok == 0) {
4425                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4426                                         sctp_free_ifa(net->ro._s_addr);
4427                                         net->ro._s_addr = NULL;
4428                                         net->src_addr_selected = 0;
4429                                         if (ro->ro_rt) {
4430                                                 RTFREE(ro->ro_rt);
4431                                                 ro->ro_rt = NULL;
4432                                         }
4433                                 }
4434                                 if (net->src_addr_selected == 0) {
4435                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4436                                         /* KAME hack: embed scopeid */
4437                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4438                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4439                                                 sctp_m_freem(m);
4440                                                 return (EINVAL);
4441                                         }
4442                                         /* Cache the source address */
4443                                         net->ro._s_addr = sctp_source_address_selection(inp,
4444                                             stcb,
4445                                             ro,
4446                                             net,
4447                                             0,
4448                                             vrf_id);
4449                                         (void)sa6_recoverscope(sin6);
4450                                         net->src_addr_selected = 1;
4451                                 }
4452                                 if (net->ro._s_addr == NULL) {
4453                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4454                                         net->src_addr_selected = 0;
4455                                         sctp_handle_no_route(stcb, net, so_locked);
4456                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4457                                         sctp_m_freem(m);
4458                                         return (EHOSTUNREACH);
4459                                 }
4460                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4461                         } else {
4462                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4463                                 /* KAME hack: embed scopeid */
4464                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4465                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4466                                         sctp_m_freem(m);
4467                                         return (EINVAL);
4468                                 }
4469                                 if (over_addr == NULL) {
4470                                         struct sctp_ifa *_lsrc;
4471
4472                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4473                                             net,
4474                                             out_of_asoc_ok,
4475                                             vrf_id);
4476                                         if (_lsrc == NULL) {
4477                                                 sctp_handle_no_route(stcb, net, so_locked);
4478                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4479                                                 sctp_m_freem(m);
4480                                                 return (EHOSTUNREACH);
4481                                         }
4482                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4483                                         sctp_free_ifa(_lsrc);
4484                                 } else {
4485                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4486                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4487                                 }
4488                                 (void)sa6_recoverscope(sin6);
4489                         }
4490                         lsa6->sin6_port = inp->sctp_lport;
4491
4492                         if (ro->ro_rt == NULL) {
4493                                 /*
4494                                  * src addr selection failed to find a route
4495                                  * (or valid source addr), so we can't get
4496                                  * there from here!
4497                                  */
4498                                 sctp_handle_no_route(stcb, net, so_locked);
4499                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4500                                 sctp_m_freem(m);
4501                                 return (EHOSTUNREACH);
4502                         }
4503                         /*
4504                          * XXX: sa6 may not have a valid sin6_scope_id in
4505                          * the non-SCOPEDROUTING case.
4506                          */
4507                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4508                         lsa6_storage.sin6_family = AF_INET6;
4509                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4510                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4511                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4512                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4513                                 sctp_m_freem(m);
4514                                 return (error);
4515                         }
4516                         /* XXX */
4517                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4518                         lsa6_storage.sin6_port = inp->sctp_lport;
4519                         lsa6 = &lsa6_storage;
4520                         ip6h->ip6_src = lsa6->sin6_addr;
4521
4522                         if (port) {
4523                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4524                                         sctp_handle_no_route(stcb, net, so_locked);
4525                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4526                                         sctp_m_freem(m);
4527                                         return (EHOSTUNREACH);
4528                                 }
4529                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4530                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4531                                 udp->uh_dport = port;
4532                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4533                                 udp->uh_sum = 0;
4534                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4535                         } else {
4536                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4537                         }
4538
4539                         sctphdr->src_port = src_port;
4540                         sctphdr->dest_port = dest_port;
4541                         sctphdr->v_tag = v_tag;
4542                         sctphdr->checksum = 0;
4543
4544                         /*
4545                          * We set the hop limit now since there is a good
4546                          * chance that our ro pointer is now filled
4547                          */
4548                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4549                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4550
4551 #ifdef SCTP_DEBUG
4552                         /* Copy to be sure something bad is not happening */
4553                         sin6->sin6_addr = ip6h->ip6_dst;
4554                         lsa6->sin6_addr = ip6h->ip6_src;
4555 #endif
4556
4557                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4558                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4559                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4560                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4561                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4562                         if (net) {
4563                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4564                                 /*
4565                                  * preserve the port and scope for link
4566                                  * local send
4567                                  */
4568                                 prev_scope = sin6->sin6_scope_id;
4569                                 prev_port = sin6->sin6_port;
4570                         }
4571
4572                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4573                                 /* failed to prepend data, give up */
4574                                 sctp_m_freem(m);
4575                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4576                                 return (ENOMEM);
4577                         }
4578                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4579                         if (port) {
4580                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4581                                 SCTP_STAT_INCR(sctps_sendswcrc);
4582                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4583                                         udp->uh_sum = 0xffff;
4584                                 }
4585                         } else {
4586                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4587                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4588                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4589                         }
4590                         /* send it out. table id is taken from stcb */
4591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4592                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4593                                 so = SCTP_INP_SO(inp);
4594                                 SCTP_SOCKET_UNLOCK(so, 0);
4595                         }
4596 #endif
4597 #ifdef SCTP_PACKET_LOGGING
4598                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4599                                 sctp_packet_log(o_pak);
4600 #endif
4601                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4602                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4604                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4605                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4606                                 SCTP_TCB_UNLOCK(stcb);
4607                                 SCTP_SOCKET_LOCK(so, 0);
4608                                 SCTP_TCB_LOCK(stcb);
4609                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4610                         }
4611 #endif
4612                         if (net) {
4613                                 /* for link local this must be done */
4614                                 sin6->sin6_scope_id = prev_scope;
4615                                 sin6->sin6_port = prev_port;
4616                         }
4617                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4618                         if (port) {
4619                                 UDPSTAT_INC(udps_opackets);
4620                         }
4621                         SCTP_STAT_INCR(sctps_sendpackets);
4622                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4623                         if (ret) {
4624                                 SCTP_STAT_INCR(sctps_senderrors);
4625                         }
4626                         if (net == NULL) {
4627                                 /* Now if we had a temp route free it */
4628                                 RO_RTFREE(ro);
4629                         } else {
4630                                 /*
4631                                  * PMTU check versus smallest asoc MTU goes
4632                                  * here
4633                                  */
4634                                 if (ro->ro_rt == NULL) {
4635                                         /* Route was freed */
4636                                         if (net->ro._s_addr &&
4637                                             net->src_addr_selected) {
4638                                                 sctp_free_ifa(net->ro._s_addr);
4639                                                 net->ro._s_addr = NULL;
4640                                         }
4641                                         net->src_addr_selected = 0;
4642                                 }
4643                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4644                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4645                                         uint32_t mtu;
4646
4647                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4648                                         if (mtu > 0) {
4649                                                 if (net->port) {
4650                                                         mtu -= sizeof(struct udphdr);
4651                                                 }
4652                                                 if (mtu < net->mtu) {
4653                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4654                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4655                                                         }
4656                                                         net->mtu = mtu;
4657                                                 }
4658                                         }
4659                                 } else if (ifp) {
4660                                         if (ND_IFINFO(ifp)->linkmtu &&
4661                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4662                                                 sctp_mtu_size_reset(inp,
4663                                                     &stcb->asoc,
4664                                                     ND_IFINFO(ifp)->linkmtu);
4665                                         }
4666                                 }
4667                         }
4668                         return (ret);
4669                 }
4670 #endif
4671         default:
4672                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4673                     ((struct sockaddr *)to)->sa_family);
4674                 sctp_m_freem(m);
4675                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4676                 return (EFAULT);
4677         }
4678 }
4679
4680
4681 void
4682 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4683 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4684     SCTP_UNUSED
4685 #endif
4686 )
4687 {
4688         struct mbuf *m, *m_last;
4689         struct sctp_nets *net;
4690         struct sctp_init_chunk *init;
4691         struct sctp_supported_addr_param *sup_addr;
4692         struct sctp_adaptation_layer_indication *ali;
4693         struct sctp_supported_chunk_types_param *pr_supported;
4694         struct sctp_paramhdr *ph;
4695         int cnt_inits_to = 0;
4696         int error;
4697         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4698
4699         /* INIT's always go to the primary (and usually ONLY address) */
4700         net = stcb->asoc.primary_destination;
4701         if (net == NULL) {
4702                 net = TAILQ_FIRST(&stcb->asoc.nets);
4703                 if (net == NULL) {
4704                         /* TSNH */
4705                         return;
4706                 }
4707                 /* we confirm any address we send an INIT to */
4708                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4709                 (void)sctp_set_primary_addr(stcb, NULL, net);
4710         } else {
4711                 /* we confirm any address we send an INIT to */
4712                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4713         }
4714         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4715 #ifdef INET6
4716         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4717                 /*
4718                  * special hook, if we are sending to link local it will not
4719                  * show up in our private address count.
4720                  */
4721                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4722                         cnt_inits_to = 1;
4723         }
4724 #endif
4725         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4726                 /* This case should not happen */
4727                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4728                 return;
4729         }
4730         /* start the INIT timer */
4731         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4732
4733         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4734         if (m == NULL) {
4735                 /* No memory, INIT timer will re-attempt. */
4736                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4737                 return;
4738         }
4739         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4740         padding_len = 0;
4741         /* Now lets put the chunk header in place */
4742         init = mtod(m, struct sctp_init_chunk *);
4743         /* now the chunk header */
4744         init->ch.chunk_type = SCTP_INITIATION;
4745         init->ch.chunk_flags = 0;
4746         /* fill in later from mbuf we build */
4747         init->ch.chunk_length = 0;
4748         /* place in my tag */
4749         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4750         /* set up some of the credits. */
4751         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4752             SCTP_MINIMAL_RWND));
4753         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4754         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4755         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4756
4757         /* Adaptation layer indication parameter */
4758         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4759                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4760                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4761                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4762                 ali->ph.param_length = htons(parameter_len);
4763                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4764                 chunk_len += parameter_len;
4765         }
4766
4767         /* ECN parameter */
4768         if (stcb->asoc.ecn_supported == 1) {
4769                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4772                 ph->param_length = htons(parameter_len);
4773                 chunk_len += parameter_len;
4774         }
4775
4776         /* PR-SCTP supported parameter */
4777         if (stcb->asoc.prsctp_supported == 1) {
4778                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4779                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4780                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4781                 ph->param_length = htons(parameter_len);
4782                 chunk_len += parameter_len;
4783         }
4784
4785         /* Add NAT friendly parameter. */
4786         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4787                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4788                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4789                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4790                 ph->param_length = htons(parameter_len);
4791                 chunk_len += parameter_len;
4792         }
4793
4794         /* And now tell the peer which extensions we support */
4795         num_ext = 0;
4796         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4797         if (stcb->asoc.prsctp_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4799                 if (stcb->asoc.idata_supported) {
4800                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4801                 }
4802         }
4803         if (stcb->asoc.auth_supported == 1) {
4804                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4805         }
4806         if (stcb->asoc.asconf_supported == 1) {
4807                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4808                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4809         }
4810         if (stcb->asoc.reconfig_supported == 1) {
4811                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4812         }
4813         if (stcb->asoc.idata_supported) {
4814                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4815         }
4816         if (stcb->asoc.nrsack_supported == 1) {
4817                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4818         }
4819         if (stcb->asoc.pktdrop_supported == 1) {
4820                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4821         }
4822         if (num_ext > 0) {
4823                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4824                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4825                 pr_supported->ph.param_length = htons(parameter_len);
4826                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4827                 chunk_len += parameter_len;
4828         }
4829         /* add authentication parameters */
4830         if (stcb->asoc.auth_supported) {
4831                 /* attach RANDOM parameter, if available */
4832                 if (stcb->asoc.authinfo.random != NULL) {
4833                         struct sctp_auth_random *randp;
4834
4835                         if (padding_len > 0) {
4836                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4837                                 chunk_len += padding_len;
4838                                 padding_len = 0;
4839                         }
4840                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4841                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4842                         /* random key already contains the header */
4843                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4844                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4845                         chunk_len += parameter_len;
4846                 }
4847                 /* add HMAC_ALGO parameter */
4848                 if (stcb->asoc.local_hmacs != NULL) {
4849                         struct sctp_auth_hmac_algo *hmacs;
4850
4851                         if (padding_len > 0) {
4852                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4853                                 chunk_len += padding_len;
4854                                 padding_len = 0;
4855                         }
4856                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4857                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4858                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4859                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4860                         hmacs->ph.param_length = htons(parameter_len);
4861                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4862                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4863                         chunk_len += parameter_len;
4864                 }
4865                 /* add CHUNKS parameter */
4866                 if (stcb->asoc.local_auth_chunks != NULL) {
4867                         struct sctp_auth_chunk_list *chunks;
4868
4869                         if (padding_len > 0) {
4870                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871                                 chunk_len += padding_len;
4872                                 padding_len = 0;
4873                         }
4874                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4875                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4876                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4877                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4878                         chunks->ph.param_length = htons(parameter_len);
4879                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4880                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4881                         chunk_len += parameter_len;
4882                 }
4883         }
4884
4885         /* now any cookie time extensions */
4886         if (stcb->asoc.cookie_preserve_req) {
4887                 struct sctp_cookie_perserve_param *cookie_preserve;
4888
4889                 if (padding_len > 0) {
4890                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4891                         chunk_len += padding_len;
4892                         padding_len = 0;
4893                 }
4894                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4895                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4896                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4897                 cookie_preserve->ph.param_length = htons(parameter_len);
4898                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4899                 stcb->asoc.cookie_preserve_req = 0;
4900                 chunk_len += parameter_len;
4901         }
4902
4903         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4904                 uint8_t i;
4905
4906                 if (padding_len > 0) {
4907                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4908                         chunk_len += padding_len;
4909                         padding_len = 0;
4910                 }
4911                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4912                 if (stcb->asoc.scope.ipv4_addr_legal) {
4913                         parameter_len += (uint16_t)sizeof(uint16_t);
4914                 }
4915                 if (stcb->asoc.scope.ipv6_addr_legal) {
4916                         parameter_len += (uint16_t)sizeof(uint16_t);
4917                 }
4918                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4919                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4920                 sup_addr->ph.param_length = htons(parameter_len);
4921                 i = 0;
4922                 if (stcb->asoc.scope.ipv4_addr_legal) {
4923                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4924                 }
4925                 if (stcb->asoc.scope.ipv6_addr_legal) {
4926                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4927                 }
4928                 padding_len = 4 - 2 * i;
4929                 chunk_len += parameter_len;
4930         }
4931
4932         SCTP_BUF_LEN(m) = chunk_len;
4933         /* now the addresses */
4934         /*
4935          * To optimize this we could put the scoping stuff into a structure
4936          * and remove the individual uint8's from the assoc structure. Then
4937          * we could just sifa in the address within the stcb. But for now
4938          * this is a quick hack to get the address stuff teased apart.
4939          */
4940         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4941             m, cnt_inits_to,
4942             &padding_len, &chunk_len);
4943
4944         init->ch.chunk_length = htons(chunk_len);
4945         if (padding_len > 0) {
4946                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4947                         sctp_m_freem(m);
4948                         return;
4949                 }
4950         }
4951         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4952         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4953             (struct sockaddr *)&net->ro._l_addr,
4954             m, 0, NULL, 0, 0, 0, 0,
4955             inp->sctp_lport, stcb->rport, htonl(0),
4956             net->port, NULL,
4957             0, 0,
4958             so_locked))) {
4959                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4960                 if (error == ENOBUFS) {
4961                         stcb->asoc.ifp_had_enobuf = 1;
4962                         SCTP_STAT_INCR(sctps_lowlevelerr);
4963                 }
4964         } else {
4965                 stcb->asoc.ifp_had_enobuf = 0;
4966         }
4967         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4968         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4969 }
4970
4971 struct mbuf *
4972 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4973     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4974 {
4975         /*
4976          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4977          * being equal to the beginning of the params i.e. (iphlen +
4978          * sizeof(struct sctp_init_msg) parse through the parameters to the
4979          * end of the mbuf verifying that all parameters are known.
4980          *
4981          * For unknown parameters build and return a mbuf with
4982          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4983          * processing this chunk stop, and set *abort_processing to 1.
4984          *
4985          * By having param_offset be pre-set to where parameters begin it is
4986          * hoped that this routine may be reused in the future by new
4987          * features.
4988          */
4989         struct sctp_paramhdr *phdr, params;
4990
4991         struct mbuf *mat, *op_err;
4992         int at, limit, pad_needed;
4993         uint16_t ptype, plen, padded_size;
4994         int err_at;
4995
4996         *abort_processing = 0;
4997         mat = in_initpkt;
4998         err_at = 0;
4999         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5000         at = param_offset;
5001         op_err = NULL;
5002         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5003         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5004         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5005                 ptype = ntohs(phdr->param_type);
5006                 plen = ntohs(phdr->param_length);
5007                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5008                         /* wacked parameter */
5009                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5010                         goto invalid_size;
5011                 }
5012                 limit -= SCTP_SIZE32(plen);
5013                 /*-
5014                  * All parameters for all chunks that we know/understand are
5015                  * listed here. We process them other places and make
5016                  * appropriate stop actions per the upper bits. However this
5017                  * is the generic routine processor's can call to get back
5018                  * an operr.. to either incorporate (init-ack) or send.
5019                  */
5020                 padded_size = SCTP_SIZE32(plen);
5021                 switch (ptype) {
5022                         /* Param's with variable size */
5023                 case SCTP_HEARTBEAT_INFO:
5024                 case SCTP_STATE_COOKIE:
5025                 case SCTP_UNRECOG_PARAM:
5026                 case SCTP_ERROR_CAUSE_IND:
5027                         /* ok skip fwd */
5028                         at += padded_size;
5029                         break;
5030                         /* Param's with variable size within a range */
5031                 case SCTP_CHUNK_LIST:
5032                 case SCTP_SUPPORTED_CHUNK_EXT:
5033                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5034                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5035                                 goto invalid_size;
5036                         }
5037                         at += padded_size;
5038                         break;
5039                 case SCTP_SUPPORTED_ADDRTYPE:
5040                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                 case SCTP_RANDOM:
5047                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5049                                 goto invalid_size;
5050                         }
5051                         at += padded_size;
5052                         break;
5053                 case SCTP_SET_PRIM_ADDR:
5054                 case SCTP_DEL_IP_ADDRESS:
5055                 case SCTP_ADD_IP_ADDRESS:
5056                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5057                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5059                                 goto invalid_size;
5060                         }
5061                         at += padded_size;
5062                         break;
5063                         /* Param's with a fixed size */
5064                 case SCTP_IPV4_ADDRESS:
5065                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5066                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5067                                 goto invalid_size;
5068                         }
5069                         at += padded_size;
5070                         break;
5071                 case SCTP_IPV6_ADDRESS:
5072                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_COOKIE_PRESERVE:
5079                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5081                                 goto invalid_size;
5082                         }
5083                         at += padded_size;
5084                         break;
5085                 case SCTP_HAS_NAT_SUPPORT:
5086                         *nat_friendly = 1;
5087                         /* fall through */
5088                 case SCTP_PRSCTP_SUPPORTED:
5089                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5091                                 goto invalid_size;
5092                         }
5093                         at += padded_size;
5094                         break;
5095                 case SCTP_ECN_CAPABLE:
5096                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5097                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5098                                 goto invalid_size;
5099                         }
5100                         at += padded_size;
5101                         break;
5102                 case SCTP_ULP_ADAPTATION:
5103                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5104                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5105                                 goto invalid_size;
5106                         }
5107                         at += padded_size;
5108                         break;
5109                 case SCTP_SUCCESS_REPORT:
5110                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5111                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5112                                 goto invalid_size;
5113                         }
5114                         at += padded_size;
5115                         break;
5116                 case SCTP_HOSTNAME_ADDRESS:
5117                         {
5118                                 /* We can NOT handle HOST NAME addresses!! */
5119                                 int l_len;
5120
5121                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5122                                 *abort_processing = 1;
5123                                 if (op_err == NULL) {
5124                                         /* Ok need to try to get a mbuf */
5125 #ifdef INET6
5126                                         l_len = SCTP_MIN_OVERHEAD;
5127 #else
5128                                         l_len = SCTP_MIN_V4_OVERHEAD;
5129 #endif
5130                                         l_len += sizeof(struct sctp_chunkhdr);
5131                                         l_len += sizeof(struct sctp_gen_error_cause);
5132                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5133                                         if (op_err) {
5134                                                 SCTP_BUF_LEN(op_err) = 0;
5135                                                 /*
5136                                                  * Pre-reserve space for IP,
5137                                                  * SCTP, and chunk header.
5138                                                  */
5139 #ifdef INET6
5140                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5141 #else
5142                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5143 #endif
5144                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5145                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5146                                         }
5147                                 }
5148                                 if (op_err) {
5149                                         /* If we have space */
5150                                         struct sctp_gen_error_cause cause;
5151
5152                                         if (err_at % 4) {
5153                                                 uint32_t cpthis = 0;
5154
5155                                                 pad_needed = 4 - (err_at % 4);
5156                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5157                                                 err_at += pad_needed;
5158                                         }
5159                                         cause.code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5160                                         cause.length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5161                                         m_copyback(op_err, err_at, sizeof(struct sctp_gen_error_cause), (caddr_t)&cause);
5162                                         err_at += sizeof(struct sctp_gen_error_cause);
5163                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5164                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5165                                                 sctp_m_freem(op_err);
5166                                                 return (NULL);
5167                                         }
5168                                 }
5169                                 return (op_err);
5170                                 break;
5171                         }
5172                 default:
5173                         /*
5174                          * we do not recognize the parameter figure out what
5175                          * we do.
5176                          */
5177                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5178                         if ((ptype & 0x4000) == 0x4000) {
5179                                 /* Report bit is set?? */
5180                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5181                                 if (op_err == NULL) {
5182                                         int l_len;
5183
5184                                         /* Ok need to try to get an mbuf */
5185 #ifdef INET6
5186                                         l_len = SCTP_MIN_OVERHEAD;
5187 #else
5188                                         l_len = SCTP_MIN_V4_OVERHEAD;
5189 #endif
5190                                         l_len += sizeof(struct sctp_chunkhdr);
5191                                         l_len += sizeof(struct sctp_paramhdr);
5192                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5193                                         if (op_err) {
5194                                                 SCTP_BUF_LEN(op_err) = 0;
5195 #ifdef INET6
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5197 #else
5198                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5199 #endif
5200                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5201                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5202                                         }
5203                                 }
5204                                 if (op_err) {
5205                                         /* If we have space */
5206                                         struct sctp_paramhdr s;
5207
5208                                         if (err_at % 4) {
5209                                                 uint32_t cpthis = 0;
5210
5211                                                 pad_needed = 4 - (err_at % 4);
5212                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5213                                                 err_at += pad_needed;
5214                                         }
5215                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5216                                         s.param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5217                                         m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)&s);
5218                                         err_at += sizeof(struct sctp_paramhdr);
5219                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5220                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5221                                                 sctp_m_freem(op_err);
5222                                                 /*
5223                                                  * we are out of memory but
5224                                                  * we still need to have a
5225                                                  * look at what to do (the
5226                                                  * system is in trouble
5227                                                  * though).
5228                                                  */
5229                                                 op_err = NULL;
5230                                                 goto more_processing;
5231                                         }
5232                                         err_at += plen;
5233                                 }
5234                         }
5235         more_processing:
5236                         if ((ptype & 0x8000) == 0x0000) {
5237                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5238                                 return (op_err);
5239                         } else {
5240                                 /* skip this chunk and continue processing */
5241                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5242                                 at += SCTP_SIZE32(plen);
5243                         }
5244                         break;
5245
5246                 }
5247                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5248         }
5249         return (op_err);
5250 invalid_size:
5251         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5252         *abort_processing = 1;
5253         if ((op_err == NULL) && phdr) {
5254                 int l_len;
5255 #ifdef INET6
5256                 l_len = SCTP_MIN_OVERHEAD;
5257 #else
5258                 l_len = SCTP_MIN_V4_OVERHEAD;
5259 #endif
5260                 l_len += sizeof(struct sctp_chunkhdr);
5261                 l_len += (2 * sizeof(struct sctp_paramhdr));
5262                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5263                 if (op_err) {
5264                         SCTP_BUF_LEN(op_err) = 0;
5265 #ifdef INET6
5266                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5267 #else
5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5269 #endif
5270                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5271                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5272                 }
5273         }
5274         if ((op_err) && phdr) {
5275                 struct sctp_paramhdr s;
5276
5277                 if (err_at % 4) {
5278                         uint32_t cpthis = 0;
5279
5280                         pad_needed = 4 - (err_at % 4);
5281                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5282                         err_at += pad_needed;
5283                 }
5284                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5285                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5286                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5287                 err_at += sizeof(s);
5288                 /* Only copy back the p-hdr that caused the issue */
5289                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5290         }
5291         return (op_err);
5292 }
5293
5294 static int
5295 sctp_are_there_new_addresses(struct sctp_association *asoc,
5296     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5297 {
5298         /*
5299          * Given a INIT packet, look through the packet to verify that there
5300          * are NO new addresses. As we go through the parameters add reports
5301          * of any un-understood parameters that require an error.  Also we
5302          * must return (1) to drop the packet if we see a un-understood
5303          * parameter that tells us to drop the chunk.
5304          */
5305         struct sockaddr *sa_touse;
5306         struct sockaddr *sa;
5307         struct sctp_paramhdr *phdr, params;
5308         uint16_t ptype, plen;
5309         uint8_t fnd;
5310         struct sctp_nets *net;
5311         int check_src;
5312 #ifdef INET
5313         struct sockaddr_in sin4, *sa4;
5314 #endif
5315 #ifdef INET6
5316         struct sockaddr_in6 sin6, *sa6;
5317 #endif
5318
5319 #ifdef INET
5320         memset(&sin4, 0, sizeof(sin4));
5321         sin4.sin_family = AF_INET;
5322         sin4.sin_len = sizeof(sin4);
5323 #endif
5324 #ifdef INET6
5325         memset(&sin6, 0, sizeof(sin6));
5326         sin6.sin6_family = AF_INET6;
5327         sin6.sin6_len = sizeof(sin6);
5328 #endif
5329         /* First what about the src address of the pkt ? */
5330         check_src = 0;
5331         switch (src->sa_family) {
5332 #ifdef INET
5333         case AF_INET:
5334                 if (asoc->scope.ipv4_addr_legal) {
5335                         check_src = 1;
5336                 }
5337                 break;
5338 #endif
5339 #ifdef INET6
5340         case AF_INET6:
5341                 if (asoc->scope.ipv6_addr_legal) {
5342                         check_src = 1;
5343                 }
5344                 break;
5345 #endif
5346         default:
5347                 /* TSNH */
5348                 break;
5349         }
5350         if (check_src) {
5351                 fnd = 0;
5352                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5353                         sa = (struct sockaddr *)&net->ro._l_addr;
5354                         if (sa->sa_family == src->sa_family) {
5355 #ifdef INET
5356                                 if (sa->sa_family == AF_INET) {
5357                                         struct sockaddr_in *src4;
5358
5359                                         sa4 = (struct sockaddr_in *)sa;
5360                                         src4 = (struct sockaddr_in *)src;
5361                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5362                                                 fnd = 1;
5363                                                 break;
5364                                         }
5365                                 }
5366 #endif
5367 #ifdef INET6
5368                                 if (sa->sa_family == AF_INET6) {
5369                                         struct sockaddr_in6 *src6;
5370
5371                                         sa6 = (struct sockaddr_in6 *)sa;
5372                                         src6 = (struct sockaddr_in6 *)src;
5373                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5374                                                 fnd = 1;
5375                                                 break;
5376                                         }
5377                                 }
5378 #endif
5379                         }
5380                 }
5381                 if (fnd == 0) {
5382                         /* New address added! no need to look further. */
5383                         return (1);
5384                 }
5385         }
5386         /* Ok so far lets munge through the rest of the packet */
5387         offset += sizeof(struct sctp_init_chunk);
5388         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5389         while (phdr) {
5390                 sa_touse = NULL;
5391                 ptype = ntohs(phdr->param_type);
5392                 plen = ntohs(phdr->param_length);
5393                 switch (ptype) {
5394 #ifdef INET
5395                 case SCTP_IPV4_ADDRESS:
5396                         {
5397                                 struct sctp_ipv4addr_param *p4, p4_buf;
5398
5399                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5400                                         return (1);
5401                                 }
5402                                 phdr = sctp_get_next_param(in_initpkt, offset,
5403                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5404                                 if (phdr == NULL) {
5405                                         return (1);
5406                                 }
5407                                 if (asoc->scope.ipv4_addr_legal) {
5408                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5409                                         sin4.sin_addr.s_addr = p4->addr;
5410                                         sa_touse = (struct sockaddr *)&sin4;
5411                                 }
5412                                 break;
5413                         }
5414 #endif
5415 #ifdef INET6
5416                 case SCTP_IPV6_ADDRESS:
5417                         {
5418                                 struct sctp_ipv6addr_param *p6, p6_buf;
5419
5420                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5421                                         return (1);
5422                                 }
5423                                 phdr = sctp_get_next_param(in_initpkt, offset,
5424                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5425                                 if (phdr == NULL) {
5426                                         return (1);
5427                                 }
5428                                 if (asoc->scope.ipv6_addr_legal) {
5429                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5430                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5431                                             sizeof(p6->addr));
5432                                         sa_touse = (struct sockaddr *)&sin6;
5433                                 }
5434                                 break;
5435                         }
5436 #endif
5437                 default:
5438                         sa_touse = NULL;
5439                         break;
5440                 }
5441                 if (sa_touse) {
5442                         /* ok, sa_touse points to one to check */
5443                         fnd = 0;
5444                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5445                                 sa = (struct sockaddr *)&net->ro._l_addr;
5446                                 if (sa->sa_family != sa_touse->sa_family) {
5447                                         continue;
5448                                 }
5449 #ifdef INET
5450                                 if (sa->sa_family == AF_INET) {
5451                                         sa4 = (struct sockaddr_in *)sa;
5452                                         if (sa4->sin_addr.s_addr ==
5453                                             sin4.sin_addr.s_addr) {
5454                                                 fnd = 1;
5455                                                 break;
5456                                         }
5457                                 }
5458 #endif
5459 #ifdef INET6
5460                                 if (sa->sa_family == AF_INET6) {
5461                                         sa6 = (struct sockaddr_in6 *)sa;
5462                                         if (SCTP6_ARE_ADDR_EQUAL(
5463                                             sa6, &sin6)) {
5464                                                 fnd = 1;
5465                                                 break;
5466                                         }
5467                                 }
5468 #endif
5469                         }
5470                         if (!fnd) {
5471                                 /* New addr added! no need to look further */
5472                                 return (1);
5473                         }
5474                 }
5475                 offset += SCTP_SIZE32(plen);
5476                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5477         }
5478         return (0);
5479 }
5480
5481 /*
5482  * Given a MBUF chain that was sent into us containing an INIT. Build a
5483  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5484  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5485  * message (i.e. the struct sctp_init_msg).
5486  */
5487 void
5488 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5489     struct sctp_nets *src_net, struct mbuf *init_pkt,
5490     int iphlen, int offset,
5491     struct sockaddr *src, struct sockaddr *dst,
5492     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5493     uint8_t mflowtype, uint32_t mflowid,
5494     uint32_t vrf_id, uint16_t port)
5495 {
5496         struct sctp_association *asoc;
5497         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5498         struct sctp_init_ack_chunk *initack;
5499         struct sctp_adaptation_layer_indication *ali;
5500         struct sctp_supported_chunk_types_param *pr_supported;
5501         struct sctp_paramhdr *ph;
5502         union sctp_sockstore *over_addr;
5503         struct sctp_scoping scp;
5504         struct timeval now;
5505 #ifdef INET
5506         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5507         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5508         struct sockaddr_in *sin;
5509 #endif
5510 #ifdef INET6
5511         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5512         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5513         struct sockaddr_in6 *sin6;
5514 #endif
5515         struct sockaddr *to;
5516         struct sctp_state_cookie stc;
5517         struct sctp_nets *net = NULL;
5518         uint8_t *signature = NULL;
5519         int cnt_inits_to = 0;
5520         uint16_t his_limit, i_want;
5521         int abort_flag;
5522         int nat_friendly = 0;
5523         int error;
5524         struct socket *so;
5525         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5526
5527         if (stcb) {
5528                 asoc = &stcb->asoc;
5529         } else {
5530                 asoc = NULL;
5531         }
5532         if ((asoc != NULL) &&
5533             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5534                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5535                         /*
5536                          * new addresses, out of here in non-cookie-wait
5537                          * states
5538                          *
5539                          * Send an ABORT, without the new address error
5540                          * cause. This looks no different than if no
5541                          * listener was present.
5542                          */
5543                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5544                             "Address added");
5545                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5546                             mflowtype, mflowid, inp->fibnum,
5547                             vrf_id, port);
5548                         return;
5549                 }
5550                 if (src_net != NULL && (src_net->port != port)) {
5551                         /*
5552                          * change of remote encapsulation port, out of here
5553                          * in non-cookie-wait states
5554                          *
5555                          * Send an ABORT, without an specific error cause.
5556                          * This looks no different than if no listener was
5557                          * present.
5558                          */
5559                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5560                             "Remote encapsulation port changed");
5561                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5562                             mflowtype, mflowid, inp->fibnum,
5563                             vrf_id, port);
5564                         return;
5565                 }
5566         }
5567         abort_flag = 0;
5568         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5569             (offset + sizeof(struct sctp_init_chunk)),
5570             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5571         if (abort_flag) {
5572 do_a_abort:
5573                 if (op_err == NULL) {
5574                         char msg[SCTP_DIAG_INFO_LEN];
5575
5576                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5577                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5578                             msg);
5579                 }
5580                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5581                     init_chk->init.initiate_tag, op_err,
5582                     mflowtype, mflowid, inp->fibnum,
5583                     vrf_id, port);
5584                 return;
5585         }
5586         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5587         if (m == NULL) {
5588                 /* No memory, INIT timer will re-attempt. */
5589                 if (op_err)
5590                         sctp_m_freem(op_err);
5591                 return;
5592         }
5593         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5594         padding_len = 0;
5595
5596         /*
5597          * We might not overwrite the identification[] completely and on
5598          * some platforms time_entered will contain some padding. Therefore
5599          * zero out the cookie to avoid putting uninitialized memory on the
5600          * wire.
5601          */
5602         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5603
5604         /* the time I built cookie */
5605         (void)SCTP_GETTIME_TIMEVAL(&now);
5606         stc.time_entered.tv_sec = now.tv_sec;
5607         stc.time_entered.tv_usec = now.tv_usec;
5608
5609         /* populate any tie tags */
5610         if (asoc != NULL) {
5611                 /* unlock before tag selections */
5612                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5613                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5614                 stc.cookie_life = asoc->cookie_life;
5615                 net = asoc->primary_destination;
5616         } else {
5617                 stc.tie_tag_my_vtag = 0;
5618                 stc.tie_tag_peer_vtag = 0;
5619                 /* life I will award this cookie */
5620                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5621         }
5622
5623         /* copy in the ports for later check */
5624         stc.myport = sh->dest_port;
5625         stc.peerport = sh->src_port;
5626
5627         /*
5628          * If we wanted to honor cookie life extensions, we would add to
5629          * stc.cookie_life. For now we should NOT honor any extension
5630          */
5631         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5632         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5633                 stc.ipv6_addr_legal = 1;
5634                 if (SCTP_IPV6_V6ONLY(inp)) {
5635                         stc.ipv4_addr_legal = 0;
5636                 } else {
5637                         stc.ipv4_addr_legal = 1;
5638                 }
5639         } else {
5640                 stc.ipv6_addr_legal = 0;
5641                 stc.ipv4_addr_legal = 1;
5642         }
5643         stc.ipv4_scope = 0;
5644         if (net == NULL) {
5645                 to = src;
5646                 switch (dst->sa_family) {
5647 #ifdef INET
5648                 case AF_INET:
5649                         {
5650                                 /* lookup address */
5651                                 stc.address[0] = src4->sin_addr.s_addr;
5652                                 stc.address[1] = 0;
5653                                 stc.address[2] = 0;
5654                                 stc.address[3] = 0;
5655                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5656                                 /* local from address */
5657                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5658                                 stc.laddress[1] = 0;
5659                                 stc.laddress[2] = 0;
5660                                 stc.laddress[3] = 0;
5661                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5662                                 /* scope_id is only for v6 */
5663                                 stc.scope_id = 0;
5664                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5665                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5666                                         stc.ipv4_scope = 1;
5667                                 }
5668                                 /* Must use the address in this case */
5669                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5670                                         stc.loopback_scope = 1;
5671                                         stc.ipv4_scope = 1;
5672                                         stc.site_scope = 1;
5673                                         stc.local_scope = 0;
5674                                 }
5675                                 break;
5676                         }
5677 #endif
5678 #ifdef INET6
5679                 case AF_INET6:
5680                         {
5681                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5682                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5683                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5684                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5685                                         stc.loopback_scope = 1;
5686                                         stc.local_scope = 0;
5687                                         stc.site_scope = 1;
5688                                         stc.ipv4_scope = 1;
5689                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5690                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5691                                         /*
5692                                          * If the new destination or source
5693                                          * is a LINK_LOCAL we must have
5694                                          * common both site and local scope.
5695                                          * Don't set local scope though
5696                                          * since we must depend on the
5697                                          * source to be added implicitly. We
5698                                          * cannot assure just because we
5699                                          * share one link that all links are
5700                                          * common.
5701                                          */
5702                                         stc.local_scope = 0;
5703                                         stc.site_scope = 1;
5704                                         stc.ipv4_scope = 1;
5705                                         /*
5706                                          * we start counting for the private
5707                                          * address stuff at 1. since the
5708                                          * link local we source from won't
5709                                          * show up in our scoped count.
5710                                          */
5711                                         cnt_inits_to = 1;
5712                                         /*
5713                                          * pull out the scope_id from
5714                                          * incoming pkt
5715                                          */
5716                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5717                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5718                                         /*
5719                                          * If the new destination or source
5720                                          * is SITE_LOCAL then we must have
5721                                          * site scope in common.
5722                                          */
5723                                         stc.site_scope = 1;
5724                                 }
5725                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5726                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5727                                 break;
5728                         }
5729 #endif
5730                 default:
5731                         /* TSNH */
5732                         goto do_a_abort;
5733                         break;
5734                 }
5735         } else {
5736                 /* set the scope per the existing tcb */
5737
5738 #ifdef INET6
5739                 struct sctp_nets *lnet;
5740 #endif
5741
5742                 stc.loopback_scope = asoc->scope.loopback_scope;
5743                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5744                 stc.site_scope = asoc->scope.site_scope;
5745                 stc.local_scope = asoc->scope.local_scope;
5746 #ifdef INET6
5747                 /* Why do we not consider IPv4 LL addresses? */
5748                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5749                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5750                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5751                                         /*
5752                                          * if we have a LL address, start
5753                                          * counting at 1.
5754                                          */
5755                                         cnt_inits_to = 1;
5756                                 }
5757                         }
5758                 }
5759 #endif
5760                 /* use the net pointer */
5761                 to = (struct sockaddr *)&net->ro._l_addr;
5762                 switch (to->sa_family) {
5763 #ifdef INET
5764                 case AF_INET:
5765                         sin = (struct sockaddr_in *)to;
5766                         stc.address[0] = sin->sin_addr.s_addr;
5767                         stc.address[1] = 0;
5768                         stc.address[2] = 0;
5769                         stc.address[3] = 0;
5770                         stc.addr_type = SCTP_IPV4_ADDRESS;
5771                         if (net->src_addr_selected == 0) {
5772                                 /*
5773                                  * strange case here, the INIT should have
5774                                  * did the selection.
5775                                  */
5776                                 net->ro._s_addr = sctp_source_address_selection(inp,
5777                                     stcb, (sctp_route_t *)&net->ro,
5778                                     net, 0, vrf_id);
5779                                 if (net->ro._s_addr == NULL)
5780                                         return;
5781
5782                                 net->src_addr_selected = 1;
5783
5784                         }
5785                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5786                         stc.laddress[1] = 0;
5787                         stc.laddress[2] = 0;
5788                         stc.laddress[3] = 0;
5789                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5790                         /* scope_id is only for v6 */
5791                         stc.scope_id = 0;
5792                         break;
5793 #endif
5794 #ifdef INET6
5795                 case AF_INET6:
5796                         sin6 = (struct sockaddr_in6 *)to;
5797                         memcpy(&stc.address, &sin6->sin6_addr,
5798                             sizeof(struct in6_addr));
5799                         stc.addr_type = SCTP_IPV6_ADDRESS;
5800                         stc.scope_id = sin6->sin6_scope_id;
5801                         if (net->src_addr_selected == 0) {
5802                                 /*
5803                                  * strange case here, the INIT should have
5804                                  * done the selection.
5805                                  */
5806                                 net->ro._s_addr = sctp_source_address_selection(inp,
5807                                     stcb, (sctp_route_t *)&net->ro,
5808                                     net, 0, vrf_id);
5809                                 if (net->ro._s_addr == NULL)
5810                                         return;
5811
5812                                 net->src_addr_selected = 1;
5813                         }
5814                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5815                             sizeof(struct in6_addr));
5816                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5817                         break;
5818 #endif
5819                 }
5820         }
5821         /* Now lets put the SCTP header in place */
5822         initack = mtod(m, struct sctp_init_ack_chunk *);
5823         /* Save it off for quick ref */
5824         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5825         /* who are we */
5826         memcpy(stc.identification, SCTP_VERSION_STRING,
5827             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5828         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5829         /* now the chunk header */
5830         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5831         initack->ch.chunk_flags = 0;
5832         /* fill in later from mbuf we build */
5833         initack->ch.chunk_length = 0;
5834         /* place in my tag */
5835         if ((asoc != NULL) &&
5836             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5837             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5838             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5839                 /* re-use the v-tags and init-seq here */
5840                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5841                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5842         } else {
5843                 uint32_t vtag, itsn;
5844
5845                 if (asoc) {
5846                         atomic_add_int(&asoc->refcnt, 1);
5847                         SCTP_TCB_UNLOCK(stcb);
5848         new_tag:
5849                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5850                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5851                                 /*
5852                                  * Got a duplicate vtag on some guy behind a
5853                                  * nat make sure we don't use it.
5854                                  */
5855                                 goto new_tag;
5856                         }
5857                         initack->init.initiate_tag = htonl(vtag);
5858                         /* get a TSN to use too */
5859                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5860                         initack->init.initial_tsn = htonl(itsn);
5861                         SCTP_TCB_LOCK(stcb);
5862                         atomic_add_int(&asoc->refcnt, -1);
5863                 } else {
5864                         SCTP_INP_INCR_REF(inp);
5865                         SCTP_INP_RUNLOCK(inp);
5866                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5867                         initack->init.initiate_tag = htonl(vtag);
5868                         /* get a TSN to use too */
5869                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5870                         SCTP_INP_RLOCK(inp);
5871                         SCTP_INP_DECR_REF(inp);
5872                 }
5873         }
5874         /* save away my tag to */
5875         stc.my_vtag = initack->init.initiate_tag;
5876
5877         /* set up some of the credits. */
5878         so = inp->sctp_socket;
5879         if (so == NULL) {
5880                 /* memory problem */
5881                 sctp_m_freem(m);
5882                 return;
5883         } else {
5884                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5885         }
5886         /* set what I want */
5887         his_limit = ntohs(init_chk->init.num_inbound_streams);
5888         /* choose what I want */
5889         if (asoc != NULL) {
5890                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5891                         i_want = asoc->streamoutcnt;
5892                 } else {
5893                         i_want = asoc->pre_open_streams;
5894                 }
5895         } else {
5896                 i_want = inp->sctp_ep.pre_open_stream_count;
5897         }
5898         if (his_limit < i_want) {
5899                 /* I Want more :< */
5900                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5901         } else {
5902                 /* I can have what I want :> */
5903                 initack->init.num_outbound_streams = htons(i_want);
5904         }
5905         /* tell him his limit. */
5906         initack->init.num_inbound_streams =
5907             htons(inp->sctp_ep.max_open_streams_intome);
5908
5909         /* adaptation layer indication parameter */
5910         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5911                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5912                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5913                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5914                 ali->ph.param_length = htons(parameter_len);
5915                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5916                 chunk_len += parameter_len;
5917         }
5918
5919         /* ECN parameter */
5920         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5921             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5922                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5923                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5924                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5925                 ph->param_length = htons(parameter_len);
5926                 chunk_len += parameter_len;
5927         }
5928
5929         /* PR-SCTP supported parameter */
5930         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5931             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5932                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5933                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5934                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5935                 ph->param_length = htons(parameter_len);
5936                 chunk_len += parameter_len;
5937         }
5938
5939         /* Add NAT friendly parameter */
5940         if (nat_friendly) {
5941                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5942                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5943                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5944                 ph->param_length = htons(parameter_len);
5945                 chunk_len += parameter_len;
5946         }
5947
5948         /* And now tell the peer which extensions we support */
5949         num_ext = 0;
5950         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5951         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5952             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5953                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5954                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5955                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5956                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5957                 }
5958         }
5959         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5960             ((asoc == NULL) && (inp->auth_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5962         }
5963         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5964             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5965                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5966                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5967         }
5968         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5969             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5970                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5971         }
5972         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5973             ((asoc == NULL) && (inp->idata_supported == 1))) {
5974                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5975         }
5976         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5977             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5978                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5979         }
5980         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5981             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5982                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5983         }
5984         if (num_ext > 0) {
5985                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5986                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5987                 pr_supported->ph.param_length = htons(parameter_len);
5988                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5989                 chunk_len += parameter_len;
5990         }
5991
5992         /* add authentication parameters */
5993         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5994             ((asoc == NULL) && (inp->auth_supported == 1))) {
5995                 struct sctp_auth_random *randp;
5996                 struct sctp_auth_hmac_algo *hmacs;
5997                 struct sctp_auth_chunk_list *chunks;
5998
5999                 if (padding_len > 0) {
6000                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6001                         chunk_len += padding_len;
6002                         padding_len = 0;
6003                 }
6004                 /* generate and add RANDOM parameter */
6005                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6006                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6007                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6008                 randp->ph.param_type = htons(SCTP_RANDOM);
6009                 randp->ph.param_length = htons(parameter_len);
6010                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6011                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6012                 chunk_len += parameter_len;
6013
6014                 if (padding_len > 0) {
6015                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6016                         chunk_len += padding_len;
6017                         padding_len = 0;
6018                 }
6019                 /* add HMAC_ALGO parameter */
6020                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6021                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6022                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6023                     (uint8_t *)hmacs->hmac_ids);
6024                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6025                 hmacs->ph.param_length = htons(parameter_len);
6026                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6027                 chunk_len += parameter_len;
6028
6029                 if (padding_len > 0) {
6030                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6031                         chunk_len += padding_len;
6032                         padding_len = 0;
6033                 }
6034                 /* add CHUNKS parameter */
6035                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6036                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6037                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6038                     chunks->chunk_types);
6039                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6040                 chunks->ph.param_length = htons(parameter_len);
6041                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6042                 chunk_len += parameter_len;
6043         }
6044         SCTP_BUF_LEN(m) = chunk_len;
6045         m_last = m;
6046         /* now the addresses */
6047         /*
6048          * To optimize this we could put the scoping stuff into a structure
6049          * and remove the individual uint8's from the stc structure. Then we
6050          * could just sifa in the address within the stc.. but for now this
6051          * is a quick hack to get the address stuff teased apart.
6052          */
6053         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6054         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6055         scp.loopback_scope = stc.loopback_scope;
6056         scp.ipv4_local_scope = stc.ipv4_scope;
6057         scp.local_scope = stc.local_scope;
6058         scp.site_scope = stc.site_scope;
6059         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6060             cnt_inits_to,
6061             &padding_len, &chunk_len);
6062         /* padding_len can only be positive, if no addresses have been added */
6063         if (padding_len > 0) {
6064                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6065                 chunk_len += padding_len;
6066                 SCTP_BUF_LEN(m) += padding_len;
6067                 padding_len = 0;
6068         }
6069
6070         /* tack on the operational error if present */
6071         if (op_err) {
6072                 parameter_len = 0;
6073                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6074                         parameter_len += SCTP_BUF_LEN(m_tmp);
6075                 }
6076                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6077                 SCTP_BUF_NEXT(m_last) = op_err;
6078                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6079                         m_last = SCTP_BUF_NEXT(m_last);
6080                 }
6081                 chunk_len += parameter_len;
6082         }
6083         if (padding_len > 0) {
6084                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6085                 if (m_last == NULL) {
6086                         /* Houston we have a problem, no space */
6087                         sctp_m_freem(m);
6088                         return;
6089                 }
6090                 chunk_len += padding_len;
6091                 padding_len = 0;
6092         }
6093         /* Now we must build a cookie */
6094         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6095         if (m_cookie == NULL) {
6096                 /* memory problem */
6097                 sctp_m_freem(m);
6098                 return;
6099         }
6100         /* Now append the cookie to the end and update the space/size */
6101         SCTP_BUF_NEXT(m_last) = m_cookie;
6102         parameter_len = 0;
6103         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6104                 parameter_len += SCTP_BUF_LEN(m_tmp);
6105                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6106                         m_last = m_tmp;
6107                 }
6108         }
6109         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6110         chunk_len += parameter_len;
6111
6112         /*
6113          * Place in the size, but we don't include the last pad (if any) in
6114          * the INIT-ACK.
6115          */
6116         initack->ch.chunk_length = htons(chunk_len);
6117
6118         /*
6119          * Time to sign the cookie, we don't sign over the cookie signature
6120          * though thus we set trailer.
6121          */
6122         (void)sctp_hmac_m(SCTP_HMAC,
6123             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6124             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6125             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6126         /*
6127          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6128          * here since the timer will drive a retranmission.
6129          */
6130         if (padding_len > 0) {
6131                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6132                         sctp_m_freem(m);
6133                         return;
6134                 }
6135         }
6136         if (stc.loopback_scope) {
6137                 over_addr = (union sctp_sockstore *)dst;
6138         } else {
6139                 over_addr = NULL;
6140         }
6141
6142         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6143             0, 0,
6144             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6145             port, over_addr,
6146             mflowtype, mflowid,
6147             SCTP_SO_NOT_LOCKED))) {
6148                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6149                 if (error == ENOBUFS) {
6150                         if (asoc != NULL) {
6151                                 asoc->ifp_had_enobuf = 1;
6152                         }
6153                         SCTP_STAT_INCR(sctps_lowlevelerr);
6154                 }
6155         } else {
6156                 if (asoc != NULL) {
6157                         asoc->ifp_had_enobuf = 0;
6158                 }
6159         }
6160         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6161 }
6162
6163
6164 static void
6165 sctp_prune_prsctp(struct sctp_tcb *stcb,
6166     struct sctp_association *asoc,
6167     struct sctp_sndrcvinfo *srcv,
6168     int dataout)
6169 {
6170         int freed_spc = 0;
6171         struct sctp_tmit_chunk *chk, *nchk;
6172
6173         SCTP_TCB_LOCK_ASSERT(stcb);
6174         if ((asoc->prsctp_supported) &&
6175             (asoc->sent_queue_cnt_removeable > 0)) {
6176                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6177                         /*
6178                          * Look for chunks marked with the PR_SCTP flag AND
6179                          * the buffer space flag. If the one being sent is
6180                          * equal or greater priority then purge the old one
6181                          * and free some space.
6182                          */
6183                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6184                                 /*
6185                                  * This one is PR-SCTP AND buffer space
6186                                  * limited type
6187                                  */
6188                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6189                                         /*
6190                                          * Lower numbers equates to higher
6191                                          * priority so if the one we are
6192                                          * looking at has a larger or equal
6193                                          * priority we want to drop the data
6194                                          * and NOT retransmit it.
6195                                          */
6196                                         if (chk->data) {
6197                                                 /*
6198                                                  * We release the book_size
6199                                                  * if the mbuf is here
6200                                                  */
6201                                                 int ret_spc;
6202                                                 uint8_t sent;
6203
6204                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6205                                                         sent = 1;
6206                                                 else
6207                                                         sent = 0;
6208                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6209                                                     sent,
6210                                                     SCTP_SO_LOCKED);
6211                                                 freed_spc += ret_spc;
6212                                                 if (freed_spc >= dataout) {
6213                                                         return;
6214                                                 }
6215                                         }       /* if chunk was present */
6216                                 }       /* if of sufficient priority */
6217                         }       /* if chunk has enabled */
6218                 }               /* tailqforeach */
6219
6220                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6221                         /* Here we must move to the sent queue and mark */
6222                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6223                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6224                                         if (chk->data) {
6225                                                 /*
6226                                                  * We release the book_size
6227                                                  * if the mbuf is here
6228                                                  */
6229                                                 int ret_spc;
6230
6231                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6232                                                     0, SCTP_SO_LOCKED);
6233
6234                                                 freed_spc += ret_spc;
6235                                                 if (freed_spc >= dataout) {
6236                                                         return;
6237                                                 }
6238                                         }       /* end if chk->data */
6239                                 }       /* end if right class */
6240                         }       /* end if chk pr-sctp */
6241                 }               /* tailqforeachsafe (chk) */
6242         }                       /* if enabled in asoc */
6243 }
6244
6245 int
6246 sctp_get_frag_point(struct sctp_tcb *stcb,
6247     struct sctp_association *asoc)
6248 {
6249         int siz, ovh;
6250
6251         /*
6252          * For endpoints that have both v6 and v4 addresses we must reserve
6253          * room for the ipv6 header, for those that are only dealing with V4
6254          * we use a larger frag point.
6255          */
6256         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6257                 ovh = SCTP_MIN_OVERHEAD;
6258         } else {
6259                 ovh = SCTP_MIN_V4_OVERHEAD;
6260         }
6261         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6262         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6263                 siz = asoc->smallest_mtu - ovh;
6264         else
6265                 siz = (stcb->asoc.sctp_frag_point - ovh);
6266         /*
6267          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6268          */
6269         /* A data chunk MUST fit in a cluster */
6270         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6271         /* } */
6272
6273         /* adjust for an AUTH chunk if DATA requires auth */
6274         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6275                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6276
6277         if (siz % 4) {
6278                 /* make it an even word boundary please */
6279                 siz -= (siz % 4);
6280         }
6281         return (siz);
6282 }
6283
6284 static void
6285 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6286 {
6287         /*
6288          * We assume that the user wants PR_SCTP_TTL if the user provides a
6289          * positive lifetime but does not specify any PR_SCTP policy.
6290          */
6291         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6292                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6293         } else if (sp->timetolive > 0) {
6294                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6295                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6296         } else {
6297                 return;
6298         }
6299         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6300         case CHUNK_FLAGS_PR_SCTP_BUF:
6301                 /*
6302                  * Time to live is a priority stored in tv_sec when doing
6303                  * the buffer drop thing.
6304                  */
6305                 sp->ts.tv_sec = sp->timetolive;
6306                 sp->ts.tv_usec = 0;
6307                 break;
6308         case CHUNK_FLAGS_PR_SCTP_TTL:
6309                 {
6310                         struct timeval tv;
6311
6312                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6313                         tv.tv_sec = sp->timetolive / 1000;
6314                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6315                         /*
6316                          * TODO sctp_constants.h needs alternative time
6317                          * macros when _KERNEL is undefined.
6318                          */
6319                         timevaladd(&sp->ts, &tv);
6320                 }
6321                 break;
6322         case CHUNK_FLAGS_PR_SCTP_RTX:
6323                 /*
6324                  * Time to live is a the number or retransmissions stored in
6325                  * tv_sec.
6326                  */
6327                 sp->ts.tv_sec = sp->timetolive;
6328                 sp->ts.tv_usec = 0;
6329                 break;
6330         default:
6331                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6332                     "Unknown PR_SCTP policy %u.\n",
6333                     PR_SCTP_POLICY(sp->sinfo_flags));
6334                 break;
6335         }
6336 }
6337
6338 static int
6339 sctp_msg_append(struct sctp_tcb *stcb,
6340     struct sctp_nets *net,
6341     struct mbuf *m,
6342     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6343 {
6344         int error = 0;
6345         struct mbuf *at;
6346         struct sctp_stream_queue_pending *sp = NULL;
6347         struct sctp_stream_out *strm;
6348
6349         /*
6350          * Given an mbuf chain, put it into the association send queue and
6351          * place it on the wheel
6352          */
6353         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6354                 /* Invalid stream number */
6355                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6356                 error = EINVAL;
6357                 goto out_now;
6358         }
6359         if ((stcb->asoc.stream_locked) &&
6360             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6361                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6362                 error = EINVAL;
6363                 goto out_now;
6364         }
6365         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6366         /* Now can we send this? */
6367         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6368             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6369             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6370             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6371                 /* got data while shutting down */
6372                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6373                 error = ECONNRESET;
6374                 goto out_now;
6375         }
6376         sctp_alloc_a_strmoq(stcb, sp);
6377         if (sp == NULL) {
6378                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6379                 error = ENOMEM;
6380                 goto out_now;
6381         }
6382         sp->sinfo_flags = srcv->sinfo_flags;
6383         sp->timetolive = srcv->sinfo_timetolive;
6384         sp->ppid = srcv->sinfo_ppid;
6385         sp->context = srcv->sinfo_context;
6386         sp->fsn = 0;
6387         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6388                 sp->net = net;
6389                 atomic_add_int(&sp->net->ref_count, 1);
6390         } else {
6391                 sp->net = NULL;
6392         }
6393         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6394         sp->sid = srcv->sinfo_stream;
6395         sp->msg_is_complete = 1;
6396         sp->sender_all_done = 1;
6397         sp->some_taken = 0;
6398         sp->data = m;
6399         sp->tail_mbuf = NULL;
6400         sctp_set_prsctp_policy(sp);
6401         /*
6402          * We could in theory (for sendall) sifa the length in, but we would
6403          * still have to hunt through the chain since we need to setup the
6404          * tail_mbuf
6405          */
6406         sp->length = 0;
6407         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6408                 if (SCTP_BUF_NEXT(at) == NULL)
6409                         sp->tail_mbuf = at;
6410                 sp->length += SCTP_BUF_LEN(at);
6411         }
6412         if (srcv->sinfo_keynumber_valid) {
6413                 sp->auth_keyid = srcv->sinfo_keynumber;
6414         } else {
6415                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6416         }
6417         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6418                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6419                 sp->holds_key_ref = 1;
6420         }
6421         if (hold_stcb_lock == 0) {
6422                 SCTP_TCB_SEND_LOCK(stcb);
6423         }
6424         sctp_snd_sb_alloc(stcb, sp->length);
6425         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6426         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6427         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6428         m = NULL;
6429         if (hold_stcb_lock == 0) {
6430                 SCTP_TCB_SEND_UNLOCK(stcb);
6431         }
6432 out_now:
6433         if (m) {
6434                 sctp_m_freem(m);
6435         }
6436         return (error);
6437 }
6438
6439
6440 static struct mbuf *
6441 sctp_copy_mbufchain(struct mbuf *clonechain,
6442     struct mbuf *outchain,
6443     struct mbuf **endofchain,
6444     int can_take_mbuf,
6445     int sizeofcpy,
6446     uint8_t copy_by_ref)
6447 {
6448         struct mbuf *m;
6449         struct mbuf *appendchain;
6450         caddr_t cp;
6451         int len;
6452
6453         if (endofchain == NULL) {
6454                 /* error */
6455 error_out:
6456                 if (outchain)
6457                         sctp_m_freem(outchain);
6458                 return (NULL);
6459         }
6460         if (can_take_mbuf) {
6461                 appendchain = clonechain;
6462         } else {
6463                 if (!copy_by_ref &&
6464                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6465                     ) {
6466                         /* Its not in a cluster */
6467                         if (*endofchain == NULL) {
6468                                 /* lets get a mbuf cluster */
6469                                 if (outchain == NULL) {
6470                                         /* This is the general case */
6471                         new_mbuf:
6472                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6473                                         if (outchain == NULL) {
6474                                                 goto error_out;
6475                                         }
6476                                         SCTP_BUF_LEN(outchain) = 0;
6477                                         *endofchain = outchain;
6478                                         /* get the prepend space */
6479                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6480                                 } else {
6481                                         /*
6482                                          * We really should not get a NULL
6483                                          * in endofchain
6484                                          */
6485                                         /* find end */
6486                                         m = outchain;
6487                                         while (m) {
6488                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6489                                                         *endofchain = m;
6490                                                         break;
6491                                                 }
6492                                                 m = SCTP_BUF_NEXT(m);
6493                                         }
6494                                         /* sanity */
6495                                         if (*endofchain == NULL) {
6496                                                 /*
6497                                                  * huh, TSNH XXX maybe we
6498                                                  * should panic
6499                                                  */
6500                                                 sctp_m_freem(outchain);
6501                                                 goto new_mbuf;
6502                                         }
6503                                 }
6504                                 /* get the new end of length */
6505                                 len = (int)M_TRAILINGSPACE(*endofchain);
6506                         } else {
6507                                 /* how much is left at the end? */
6508                                 len = (int)M_TRAILINGSPACE(*endofchain);
6509                         }
6510                         /* Find the end of the data, for appending */
6511                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6512
6513                         /* Now lets copy it out */
6514                         if (len >= sizeofcpy) {
6515                                 /* It all fits, copy it in */
6516                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6517                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6518                         } else {
6519                                 /* fill up the end of the chain */
6520                                 if (len > 0) {
6521                                         m_copydata(clonechain, 0, len, cp);
6522                                         SCTP_BUF_LEN((*endofchain)) += len;
6523                                         /* now we need another one */
6524                                         sizeofcpy -= len;
6525                                 }
6526                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6527                                 if (m == NULL) {
6528                                         /* We failed */
6529                                         goto error_out;
6530                                 }
6531                                 SCTP_BUF_NEXT((*endofchain)) = m;
6532                                 *endofchain = m;
6533                                 cp = mtod((*endofchain), caddr_t);
6534                                 m_copydata(clonechain, len, sizeofcpy, cp);
6535                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6536                         }
6537                         return (outchain);
6538                 } else {
6539                         /* copy the old fashion way */
6540                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6541 #ifdef SCTP_MBUF_LOGGING
6542                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6543                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6544                         }
6545 #endif
6546                 }
6547         }
6548         if (appendchain == NULL) {
6549                 /* error */
6550                 if (outchain)
6551                         sctp_m_freem(outchain);
6552                 return (NULL);
6553         }
6554         if (outchain) {
6555                 /* tack on to the end */
6556                 if (*endofchain != NULL) {
6557                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6558                 } else {
6559                         m = outchain;
6560                         while (m) {
6561                                 if (SCTP_BUF_NEXT(m) == NULL) {
6562                                         SCTP_BUF_NEXT(m) = appendchain;
6563                                         break;
6564                                 }
6565                                 m = SCTP_BUF_NEXT(m);
6566                         }
6567                 }
6568                 /*
6569                  * save off the end and update the end-chain position
6570                  */
6571                 m = appendchain;
6572                 while (m) {
6573                         if (SCTP_BUF_NEXT(m) == NULL) {
6574                                 *endofchain = m;
6575                                 break;
6576                         }
6577                         m = SCTP_BUF_NEXT(m);
6578                 }
6579                 return (outchain);
6580         } else {
6581                 /* save off the end and update the end-chain position */
6582                 m = appendchain;
6583                 while (m) {
6584                         if (SCTP_BUF_NEXT(m) == NULL) {
6585                                 *endofchain = m;
6586                                 break;
6587                         }
6588                         m = SCTP_BUF_NEXT(m);
6589                 }
6590                 return (appendchain);
6591         }
6592 }
6593
6594 static int
6595 sctp_med_chunk_output(struct sctp_inpcb *inp,
6596     struct sctp_tcb *stcb,
6597     struct sctp_association *asoc,
6598     int *num_out,
6599     int *reason_code,
6600     int control_only, int from_where,
6601     struct timeval *now, int *now_filled, int frag_point, int so_locked
6602 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6603     SCTP_UNUSED
6604 #endif
6605 );
6606
6607 static void
6608 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6609     uint32_t val SCTP_UNUSED)
6610 {
6611         struct sctp_copy_all *ca;
6612         struct mbuf *m;
6613         int ret = 0;
6614         int added_control = 0;
6615         int un_sent, do_chunk_output = 1;
6616         struct sctp_association *asoc;
6617         struct sctp_nets *net;
6618
6619         ca = (struct sctp_copy_all *)ptr;
6620         if (ca->m == NULL) {
6621                 return;
6622         }
6623         if (ca->inp != inp) {
6624                 /* TSNH */
6625                 return;
6626         }
6627         if (ca->sndlen > 0) {
6628                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6629                 if (m == NULL) {
6630                         /* can't copy so we are done */
6631                         ca->cnt_failed++;
6632                         return;
6633                 }
6634 #ifdef SCTP_MBUF_LOGGING
6635                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6636                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6637                 }
6638 #endif
6639         } else {
6640                 m = NULL;
6641         }
6642         SCTP_TCB_LOCK_ASSERT(stcb);
6643         if (stcb->asoc.alternate) {
6644                 net = stcb->asoc.alternate;
6645         } else {
6646                 net = stcb->asoc.primary_destination;
6647         }
6648         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6649                 /* Abort this assoc with m as the user defined reason */
6650                 if (m != NULL) {
6651                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6652                 } else {
6653                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6654                             0, M_NOWAIT, 1, MT_DATA);
6655                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6656                 }
6657                 if (m != NULL) {
6658                         struct sctp_paramhdr *ph;
6659
6660                         ph = mtod(m, struct sctp_paramhdr *);
6661                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6662                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6663                 }
6664                 /*
6665                  * We add one here to keep the assoc from dis-appearing on
6666                  * us.
6667                  */
6668                 atomic_add_int(&stcb->asoc.refcnt, 1);
6669                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6670                 /*
6671                  * sctp_abort_an_association calls sctp_free_asoc() free
6672                  * association will NOT free it since we incremented the
6673                  * refcnt .. we do this to prevent it being freed and things
6674                  * getting tricky since we could end up (from free_asoc)
6675                  * calling inpcb_free which would get a recursive lock call
6676                  * to the iterator lock.. But as a consequence of that the
6677                  * stcb will return to us un-locked.. since free_asoc
6678                  * returns with either no TCB or the TCB unlocked, we must
6679                  * relock.. to unlock in the iterator timer :-0
6680                  */
6681                 SCTP_TCB_LOCK(stcb);
6682                 atomic_add_int(&stcb->asoc.refcnt, -1);
6683                 goto no_chunk_output;
6684         } else {
6685                 if (m) {
6686                         ret = sctp_msg_append(stcb, net, m,
6687                             &ca->sndrcv, 1);
6688                 }
6689                 asoc = &stcb->asoc;
6690                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6691                         /* shutdown this assoc */
6692                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6693                             TAILQ_EMPTY(&asoc->sent_queue) &&
6694                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6695                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6696                                         goto abort_anyway;
6697                                 }
6698                                 /*
6699                                  * there is nothing queued to send, so I'm
6700                                  * done...
6701                                  */
6702                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6703                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6704                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6705                                         /*
6706                                          * only send SHUTDOWN the first time
6707                                          * through
6708                                          */
6709                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6710                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6711                                         }
6712                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6713                                         sctp_stop_timers_for_shutdown(stcb);
6714                                         sctp_send_shutdown(stcb, net);
6715                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6716                                             net);
6717                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6718                                             asoc->primary_destination);
6719                                         added_control = 1;
6720                                         do_chunk_output = 0;
6721                                 }
6722                         } else {
6723                                 /*
6724                                  * we still got (or just got) data to send,
6725                                  * so set SHUTDOWN_PENDING
6726                                  */
6727                                 /*
6728                                  * XXX sockets draft says that SCTP_EOF
6729                                  * should be sent with no data.  currently,
6730                                  * we will allow user data to be sent first
6731                                  * and move to SHUTDOWN-PENDING
6732                                  */
6733                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6734                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6735                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6736                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6737                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6738                                         }
6739                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6740                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6741                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6742                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6743                                                 struct mbuf *op_err;
6744                                                 char msg[SCTP_DIAG_INFO_LEN];
6745
6746                                 abort_anyway:
6747                                                 snprintf(msg, sizeof(msg),
6748                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6749                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6750                                                     msg);
6751                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6752                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6753                                                     op_err, SCTP_SO_NOT_LOCKED);
6754                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6755                                                 goto no_chunk_output;
6756                                         }
6757                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6758                                             asoc->primary_destination);
6759                                 }
6760                         }
6761
6762                 }
6763         }
6764         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6765             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6766
6767         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6768             (stcb->asoc.total_flight > 0) &&
6769             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6770                 do_chunk_output = 0;
6771         }
6772         if (do_chunk_output)
6773                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6774         else if (added_control) {
6775                 int num_out, reason, now_filled = 0;
6776                 struct timeval now;
6777                 int frag_point;
6778
6779                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6780                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6781                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6782         }
6783 no_chunk_output:
6784         if (ret) {
6785                 ca->cnt_failed++;
6786         } else {
6787                 ca->cnt_sent++;
6788         }
6789 }
6790
6791 static void
6792 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6793 {
6794         struct sctp_copy_all *ca;
6795
6796         ca = (struct sctp_copy_all *)ptr;
6797         /*
6798          * Do a notify here? Kacheong suggests that the notify be done at
6799          * the send time.. so you would push up a notification if any send
6800          * failed. Don't know if this is feasible since the only failures we
6801          * have is "memory" related and if you cannot get an mbuf to send
6802          * the data you surely can't get an mbuf to send up to notify the
6803          * user you can't send the data :->
6804          */
6805
6806         /* now free everything */
6807         if (ca->inp) {
6808                 /* Lets clear the flag to allow others to run. */
6809                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6810         }
6811         sctp_m_freem(ca->m);
6812         SCTP_FREE(ca, SCTP_M_COPYAL);
6813 }
6814
6815 static struct mbuf *
6816 sctp_copy_out_all(struct uio *uio, ssize_t len)
6817 {
6818         struct mbuf *ret, *at;
6819         ssize_t left, willcpy, cancpy, error;
6820
6821         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6822         if (ret == NULL) {
6823                 /* TSNH */
6824                 return (NULL);
6825         }
6826         left = len;
6827         SCTP_BUF_LEN(ret) = 0;
6828         /* save space for the data chunk header */
6829         cancpy = (int)M_TRAILINGSPACE(ret);
6830         willcpy = min(cancpy, left);
6831         at = ret;
6832         while (left > 0) {
6833                 /* Align data to the end */
6834                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6835                 if (error) {
6836         err_out_now:
6837                         sctp_m_freem(at);
6838                         return (NULL);
6839                 }
6840                 SCTP_BUF_LEN(at) = (int)willcpy;
6841                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6842                 left -= willcpy;
6843                 if (left > 0) {
6844                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6845                         if (SCTP_BUF_NEXT(at) == NULL) {
6846                                 goto err_out_now;
6847                         }
6848                         at = SCTP_BUF_NEXT(at);
6849                         SCTP_BUF_LEN(at) = 0;
6850                         cancpy = (int)M_TRAILINGSPACE(at);
6851                         willcpy = min(cancpy, left);
6852                 }
6853         }
6854         return (ret);
6855 }
6856
6857 static int
6858 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6859     struct sctp_sndrcvinfo *srcv)
6860 {
6861         int ret;
6862         struct sctp_copy_all *ca;
6863
6864         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6865                 /* There is another. */
6866                 return (EBUSY);
6867         }
6868         if (uio->uio_resid > SCTP_MAX_SENDALL_LIMIT) {
6869                 /* You must be less than the max! */
6870                 return (EMSGSIZE);
6871         }
6872         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6873             SCTP_M_COPYAL);
6874         if (ca == NULL) {
6875                 sctp_m_freem(m);
6876                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6877                 return (ENOMEM);
6878         }
6879         memset(ca, 0, sizeof(struct sctp_copy_all));
6880
6881         ca->inp = inp;
6882         if (srcv) {
6883                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6884         }
6885         /*
6886          * take off the sendall flag, it would be bad if we failed to do
6887          * this :-0
6888          */
6889         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6890         /* get length and mbuf chain */
6891         if (uio) {
6892                 ca->sndlen = uio->uio_resid;
6893                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6894                 if (ca->m == NULL) {
6895                         SCTP_FREE(ca, SCTP_M_COPYAL);
6896                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6897                         return (ENOMEM);
6898                 }
6899         } else {
6900                 /* Gather the length of the send */
6901                 struct mbuf *mat;
6902
6903                 ca->sndlen = 0;
6904                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6905                         ca->sndlen += SCTP_BUF_LEN(mat);
6906                 }
6907         }
6908         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6909         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6910             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6911             SCTP_ASOC_ANY_STATE,
6912             (void *)ca, 0,
6913             sctp_sendall_completes, inp, 1);
6914         if (ret) {
6915                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6916                 SCTP_FREE(ca, SCTP_M_COPYAL);
6917                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6918                 return (EFAULT);
6919         }
6920         return (0);
6921 }
6922
6923
6924 void
6925 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6926 {
6927         struct sctp_tmit_chunk *chk, *nchk;
6928
6929         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6930                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6931                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6932                         asoc->ctrl_queue_cnt--;
6933                         if (chk->data) {
6934                                 sctp_m_freem(chk->data);
6935                                 chk->data = NULL;
6936                         }
6937                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6938                 }
6939         }
6940 }
6941
6942 void
6943 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6944 {
6945         struct sctp_association *asoc;
6946         struct sctp_tmit_chunk *chk, *nchk;
6947         struct sctp_asconf_chunk *acp;
6948
6949         asoc = &stcb->asoc;
6950         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6951                 /* find SCTP_ASCONF chunk in queue */
6952                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6953                         if (chk->data) {
6954                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6955                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6956                                         /* Not Acked yet */
6957                                         break;
6958                                 }
6959                         }
6960                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6961                         asoc->ctrl_queue_cnt--;
6962                         if (chk->data) {
6963                                 sctp_m_freem(chk->data);
6964                                 chk->data = NULL;
6965                         }
6966                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6967                 }
6968         }
6969 }
6970
6971
6972 static void
6973 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6974     struct sctp_association *asoc,
6975     struct sctp_tmit_chunk **data_list,
6976     int bundle_at,
6977     struct sctp_nets *net)
6978 {
6979         int i;
6980         struct sctp_tmit_chunk *tp1;
6981
6982         for (i = 0; i < bundle_at; i++) {
6983                 /* off of the send queue */
6984                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6985                 asoc->send_queue_cnt--;
6986                 if (i > 0) {
6987                         /*
6988                          * Any chunk NOT 0 you zap the time chunk 0 gets
6989                          * zapped or set based on if a RTO measurment is
6990                          * needed.
6991                          */
6992                         data_list[i]->do_rtt = 0;
6993                 }
6994                 /* record time */
6995                 data_list[i]->sent_rcv_time = net->last_sent_time;
6996                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6997                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6998                 if (data_list[i]->whoTo == NULL) {
6999                         data_list[i]->whoTo = net;
7000                         atomic_add_int(&net->ref_count, 1);
7001                 }
7002                 /* on to the sent queue */
7003                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7004                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7005                         struct sctp_tmit_chunk *tpp;
7006
7007                         /* need to move back */
7008         back_up_more:
7009                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7010                         if (tpp == NULL) {
7011                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7012                                 goto all_done;
7013                         }
7014                         tp1 = tpp;
7015                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7016                                 goto back_up_more;
7017                         }
7018                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7019                 } else {
7020                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7021                             data_list[i],
7022                             sctp_next);
7023                 }
7024 all_done:
7025                 /* This does not lower until the cum-ack passes it */
7026                 asoc->sent_queue_cnt++;
7027                 if ((asoc->peers_rwnd <= 0) &&
7028                     (asoc->total_flight == 0) &&
7029                     (bundle_at == 1)) {
7030                         /* Mark the chunk as being a window probe */
7031                         SCTP_STAT_INCR(sctps_windowprobed);
7032                 }
7033 #ifdef SCTP_AUDITING_ENABLED
7034                 sctp_audit_log(0xC2, 3);
7035 #endif
7036                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7037                 data_list[i]->snd_count = 1;
7038                 data_list[i]->rec.data.chunk_was_revoked = 0;
7039                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7040                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7041                             data_list[i]->whoTo->flight_size,
7042                             data_list[i]->book_size,
7043                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7044                             data_list[i]->rec.data.tsn);
7045                 }
7046                 sctp_flight_size_increase(data_list[i]);
7047                 sctp_total_flight_increase(stcb, data_list[i]);
7048                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7049                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7050                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7051                 }
7052                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7053                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7054                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7055                         /* SWS sender side engages */
7056                         asoc->peers_rwnd = 0;
7057                 }
7058         }
7059         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7060                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7061         }
7062 }
7063
7064 static void
7065 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7066 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7067     SCTP_UNUSED
7068 #endif
7069 )
7070 {
7071         struct sctp_tmit_chunk *chk, *nchk;
7072
7073         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7074                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7075                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7076                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7077                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7078                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7079                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7080                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7081                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7082                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7083                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7084                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7085                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7086                         /* Stray chunks must be cleaned up */
7087         clean_up_anyway:
7088                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7089                         asoc->ctrl_queue_cnt--;
7090                         if (chk->data) {
7091                                 sctp_m_freem(chk->data);
7092                                 chk->data = NULL;
7093                         }
7094                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7095                                 asoc->fwd_tsn_cnt--;
7096                         }
7097                         sctp_free_a_chunk(stcb, chk, so_locked);
7098                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7099                         /* special handling, we must look into the param */
7100                         if (chk != asoc->str_reset) {
7101                                 goto clean_up_anyway;
7102                         }
7103                 }
7104         }
7105 }
7106
7107 static uint32_t
7108 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7109     uint32_t space_left, uint32_t frag_point, int eeor_on)
7110 {
7111         /*
7112          * Make a decision on if I should split a msg into multiple parts.
7113          * This is only asked of incomplete messages.
7114          */
7115         if (eeor_on) {
7116                 /*
7117                  * If we are doing EEOR we need to always send it if its the
7118                  * entire thing, since it might be all the guy is putting in
7119                  * the hopper.
7120                  */
7121                 if (space_left >= length) {
7122                         /*-
7123                          * If we have data outstanding,
7124                          * we get another chance when the sack
7125                          * arrives to transmit - wait for more data
7126                          */
7127                         if (stcb->asoc.total_flight == 0) {
7128                                 /*
7129                                  * If nothing is in flight, we zero the
7130                                  * packet counter.
7131                                  */
7132                                 return (length);
7133                         }
7134                         return (0);
7135
7136                 } else {
7137                         /* You can fill the rest */
7138                         return (space_left);
7139                 }
7140         }
7141         /*-
7142          * For those strange folk that make the send buffer
7143          * smaller than our fragmentation point, we can't
7144          * get a full msg in so we have to allow splitting.
7145          */
7146         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7147                 return (length);
7148         }
7149         if ((length <= space_left) ||
7150             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7151                 /* Sub-optimial residual don't split in non-eeor mode. */
7152                 return (0);
7153         }
7154         /*
7155          * If we reach here length is larger than the space_left. Do we wish
7156          * to split it for the sake of packet putting together?
7157          */
7158         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7159                 /* Its ok to split it */
7160                 return (min(space_left, frag_point));
7161         }
7162         /* Nope, can't split */
7163         return (0);
7164 }
7165
7166 static uint32_t
7167 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7168     struct sctp_stream_out *strq,
7169     uint32_t space_left,
7170     uint32_t frag_point,
7171     int *giveup,
7172     int eeor_mode,
7173     int *bail,
7174     int so_locked
7175 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7176     SCTP_UNUSED
7177 #endif
7178 )
7179 {
7180         /* Move from the stream to the send_queue keeping track of the total */
7181         struct sctp_association *asoc;
7182         struct sctp_stream_queue_pending *sp;
7183         struct sctp_tmit_chunk *chk;
7184         struct sctp_data_chunk *dchkh = NULL;
7185         struct sctp_idata_chunk *ndchkh = NULL;
7186         uint32_t to_move, length;
7187         int leading;
7188         uint8_t rcv_flags = 0;
7189         uint8_t some_taken;
7190         uint8_t send_lock_up = 0;
7191
7192         SCTP_TCB_LOCK_ASSERT(stcb);
7193         asoc = &stcb->asoc;
7194 one_more_time:
7195         /* sa_ignore FREED_MEMORY */
7196         sp = TAILQ_FIRST(&strq->outqueue);
7197         if (sp == NULL) {
7198                 if (send_lock_up == 0) {
7199                         SCTP_TCB_SEND_LOCK(stcb);
7200                         send_lock_up = 1;
7201                 }
7202                 sp = TAILQ_FIRST(&strq->outqueue);
7203                 if (sp) {
7204                         goto one_more_time;
7205                 }
7206                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7207                     (stcb->asoc.idata_supported == 0) &&
7208                     (strq->last_msg_incomplete)) {
7209                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7210                             strq->sid,
7211                             strq->last_msg_incomplete);
7212                         strq->last_msg_incomplete = 0;
7213                 }
7214                 to_move = 0;
7215                 if (send_lock_up) {
7216                         SCTP_TCB_SEND_UNLOCK(stcb);
7217                         send_lock_up = 0;
7218                 }
7219                 goto out_of;
7220         }
7221         if ((sp->msg_is_complete) && (sp->length == 0)) {
7222                 if (sp->sender_all_done) {
7223                         /*
7224                          * We are doing deferred cleanup. Last time through
7225                          * when we took all the data the sender_all_done was
7226                          * not set.
7227                          */
7228                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7229                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7230                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7231                                     sp->sender_all_done,
7232                                     sp->length,
7233                                     sp->msg_is_complete,
7234                                     sp->put_last_out,
7235                                     send_lock_up);
7236                         }
7237                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7238                                 SCTP_TCB_SEND_LOCK(stcb);
7239                                 send_lock_up = 1;
7240                         }
7241                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7242                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7243                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7244                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7245                             (strq->chunks_on_queues == 0) &&
7246                             TAILQ_EMPTY(&strq->outqueue)) {
7247                                 stcb->asoc.trigger_reset = 1;
7248                         }
7249                         if (sp->net) {
7250                                 sctp_free_remote_addr(sp->net);
7251                                 sp->net = NULL;
7252                         }
7253                         if (sp->data) {
7254                                 sctp_m_freem(sp->data);
7255                                 sp->data = NULL;
7256                         }
7257                         sctp_free_a_strmoq(stcb, sp, so_locked);
7258                         /* we can't be locked to it */
7259                         if (send_lock_up) {
7260                                 SCTP_TCB_SEND_UNLOCK(stcb);
7261                                 send_lock_up = 0;
7262                         }
7263                         /* back to get the next msg */
7264                         goto one_more_time;
7265                 } else {
7266                         /*
7267                          * sender just finished this but still holds a
7268                          * reference
7269                          */
7270                         *giveup = 1;
7271                         to_move = 0;
7272                         goto out_of;
7273                 }
7274         } else {
7275                 /* is there some to get */
7276                 if (sp->length == 0) {
7277                         /* no */
7278                         *giveup = 1;
7279                         to_move = 0;
7280                         goto out_of;
7281                 } else if (sp->discard_rest) {
7282                         if (send_lock_up == 0) {
7283                                 SCTP_TCB_SEND_LOCK(stcb);
7284                                 send_lock_up = 1;
7285                         }
7286                         /* Whack down the size */
7287                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7288                         if ((stcb->sctp_socket != NULL) &&
7289                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7290                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7291                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7292                         }
7293                         if (sp->data) {
7294                                 sctp_m_freem(sp->data);
7295                                 sp->data = NULL;
7296                                 sp->tail_mbuf = NULL;
7297                         }
7298                         sp->length = 0;
7299                         sp->some_taken = 1;
7300                         *giveup = 1;
7301                         to_move = 0;
7302                         goto out_of;
7303                 }
7304         }
7305         some_taken = sp->some_taken;
7306 re_look:
7307         length = sp->length;
7308         if (sp->msg_is_complete) {
7309                 /* The message is complete */
7310                 to_move = min(length, frag_point);
7311                 if (to_move == length) {
7312                         /* All of it fits in the MTU */
7313                         if (sp->some_taken) {
7314                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7315                         } else {
7316                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7317                         }
7318                         sp->put_last_out = 1;
7319                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7320                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7321                         }
7322                 } else {
7323                         /* Not all of it fits, we fragment */
7324                         if (sp->some_taken == 0) {
7325                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7326                         }
7327                         sp->some_taken = 1;
7328                 }
7329         } else {
7330                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7331                 if (to_move) {
7332                         /*-
7333                          * We use a snapshot of length in case it
7334                          * is expanding during the compare.
7335                          */
7336                         uint32_t llen;
7337
7338                         llen = length;
7339                         if (to_move >= llen) {
7340                                 to_move = llen;
7341                                 if (send_lock_up == 0) {
7342                                         /*-
7343                                          * We are taking all of an incomplete msg
7344                                          * thus we need a send lock.
7345                                          */
7346                                         SCTP_TCB_SEND_LOCK(stcb);
7347                                         send_lock_up = 1;
7348                                         if (sp->msg_is_complete) {
7349                                                 /*
7350                                                  * the sender finished the
7351                                                  * msg
7352                                                  */
7353                                                 goto re_look;
7354                                         }
7355                                 }
7356                         }
7357                         if (sp->some_taken == 0) {
7358                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7359                                 sp->some_taken = 1;
7360                         }
7361                 } else {
7362                         /* Nothing to take. */
7363                         *giveup = 1;
7364                         to_move = 0;
7365                         goto out_of;
7366                 }
7367         }
7368
7369         /* If we reach here, we can copy out a chunk */
7370         sctp_alloc_a_chunk(stcb, chk);
7371         if (chk == NULL) {
7372                 /* No chunk memory */
7373                 *giveup = 1;
7374                 to_move = 0;
7375                 goto out_of;
7376         }
7377         /*
7378          * Setup for unordered if needed by looking at the user sent info
7379          * flags.
7380          */
7381         if (sp->sinfo_flags & SCTP_UNORDERED) {
7382                 rcv_flags |= SCTP_DATA_UNORDERED;
7383         }
7384         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7385             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7386                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7387         }
7388         /* clear out the chunk before setting up */
7389         memset(chk, 0, sizeof(*chk));
7390         chk->rec.data.rcv_flags = rcv_flags;
7391
7392         if (to_move >= length) {
7393                 /* we think we can steal the whole thing */
7394                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7395                         SCTP_TCB_SEND_LOCK(stcb);
7396                         send_lock_up = 1;
7397                 }
7398                 if (to_move < sp->length) {
7399                         /* bail, it changed */
7400                         goto dont_do_it;
7401                 }
7402                 chk->data = sp->data;
7403                 chk->last_mbuf = sp->tail_mbuf;
7404                 /* register the stealing */
7405                 sp->data = sp->tail_mbuf = NULL;
7406         } else {
7407                 struct mbuf *m;
7408
7409 dont_do_it:
7410                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7411                 chk->last_mbuf = NULL;
7412                 if (chk->data == NULL) {
7413                         sp->some_taken = some_taken;
7414                         sctp_free_a_chunk(stcb, chk, so_locked);
7415                         *bail = 1;
7416                         to_move = 0;
7417                         goto out_of;
7418                 }
7419 #ifdef SCTP_MBUF_LOGGING
7420                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7421                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7422                 }
7423 #endif
7424                 /* Pull off the data */
7425                 m_adj(sp->data, to_move);
7426                 /* Now lets work our way down and compact it */
7427                 m = sp->data;
7428                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7429                         sp->data = SCTP_BUF_NEXT(m);
7430                         SCTP_BUF_NEXT(m) = NULL;
7431                         if (sp->tail_mbuf == m) {
7432                                 /*-
7433                                  * Freeing tail? TSNH since
7434                                  * we supposedly were taking less
7435                                  * than the sp->length.
7436                                  */
7437 #ifdef INVARIANTS
7438                                 panic("Huh, freing tail? - TSNH");
7439 #else
7440                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7441                                 sp->tail_mbuf = sp->data = NULL;
7442                                 sp->length = 0;
7443 #endif
7444
7445                         }
7446                         sctp_m_free(m);
7447                         m = sp->data;
7448                 }
7449         }
7450         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7451                 chk->copy_by_ref = 1;
7452         } else {
7453                 chk->copy_by_ref = 0;
7454         }
7455         /*
7456          * get last_mbuf and counts of mb usage This is ugly but hopefully
7457          * its only one mbuf.
7458          */
7459         if (chk->last_mbuf == NULL) {
7460                 chk->last_mbuf = chk->data;
7461                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7462                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7463                 }
7464         }
7465
7466         if (to_move > length) {
7467                 /*- This should not happen either
7468                  * since we always lower to_move to the size
7469                  * of sp->length if its larger.
7470                  */
7471 #ifdef INVARIANTS
7472                 panic("Huh, how can to_move be larger?");
7473 #else
7474                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7475                 sp->length = 0;
7476 #endif
7477         } else {
7478                 atomic_subtract_int(&sp->length, to_move);
7479         }
7480         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7481         if (M_LEADINGSPACE(chk->data) < leading) {
7482                 /* Not enough room for a chunk header, get some */
7483                 struct mbuf *m;
7484
7485                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7486                 if (m == NULL) {
7487                         /*
7488                          * we're in trouble here. _PREPEND below will free
7489                          * all the data if there is no leading space, so we
7490                          * must put the data back and restore.
7491                          */
7492                         if (send_lock_up == 0) {
7493                                 SCTP_TCB_SEND_LOCK(stcb);
7494                                 send_lock_up = 1;
7495                         }
7496                         if (sp->data == NULL) {
7497                                 /* unsteal the data */
7498                                 sp->data = chk->data;
7499                                 sp->tail_mbuf = chk->last_mbuf;
7500                         } else {
7501                                 struct mbuf *m_tmp;
7502
7503                                 /* reassemble the data */
7504                                 m_tmp = sp->data;
7505                                 sp->data = chk->data;
7506                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7507                         }
7508                         sp->some_taken = some_taken;
7509                         atomic_add_int(&sp->length, to_move);
7510                         chk->data = NULL;
7511                         *bail = 1;
7512                         sctp_free_a_chunk(stcb, chk, so_locked);
7513                         to_move = 0;
7514                         goto out_of;
7515                 } else {
7516                         SCTP_BUF_LEN(m) = 0;
7517                         SCTP_BUF_NEXT(m) = chk->data;
7518                         chk->data = m;
7519                         M_ALIGN(chk->data, 4);
7520                 }
7521         }
7522         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7523         if (chk->data == NULL) {
7524                 /* HELP, TSNH since we assured it would not above? */
7525 #ifdef INVARIANTS
7526                 panic("prepend failes HELP?");
7527 #else
7528                 SCTP_PRINTF("prepend fails HELP?\n");
7529                 sctp_free_a_chunk(stcb, chk, so_locked);
7530 #endif
7531                 *bail = 1;
7532                 to_move = 0;
7533                 goto out_of;
7534         }
7535         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7536         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7537         chk->book_size_scale = 0;
7538         chk->sent = SCTP_DATAGRAM_UNSENT;
7539
7540         chk->flags = 0;
7541         chk->asoc = &stcb->asoc;
7542         chk->pad_inplace = 0;
7543         chk->no_fr_allowed = 0;
7544         if (stcb->asoc.idata_supported == 0) {
7545                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7546                         /* Just use 0. The receiver ignores the values. */
7547                         chk->rec.data.mid = 0;
7548                 } else {
7549                         chk->rec.data.mid = strq->next_mid_ordered;
7550                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7551                                 strq->next_mid_ordered++;
7552                         }
7553                 }
7554         } else {
7555                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7556                         chk->rec.data.mid = strq->next_mid_unordered;
7557                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7558                                 strq->next_mid_unordered++;
7559                         }
7560                 } else {
7561                         chk->rec.data.mid = strq->next_mid_ordered;
7562                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7563                                 strq->next_mid_ordered++;
7564                         }
7565                 }
7566         }
7567         chk->rec.data.sid = sp->sid;
7568         chk->rec.data.ppid = sp->ppid;
7569         chk->rec.data.context = sp->context;
7570         chk->rec.data.doing_fast_retransmit = 0;
7571
7572         chk->rec.data.timetodrop = sp->ts;
7573         chk->flags = sp->act_flags;
7574
7575         if (sp->net) {
7576                 chk->whoTo = sp->net;
7577                 atomic_add_int(&chk->whoTo->ref_count, 1);
7578         } else
7579                 chk->whoTo = NULL;
7580
7581         if (sp->holds_key_ref) {
7582                 chk->auth_keyid = sp->auth_keyid;
7583                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7584                 chk->holds_key_ref = 1;
7585         }
7586         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7587         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7588                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7589                     (uint32_t)(uintptr_t)stcb, sp->length,
7590                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7591                     chk->rec.data.tsn);
7592         }
7593         if (stcb->asoc.idata_supported == 0) {
7594                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7595         } else {
7596                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7597         }
7598         /*
7599          * Put the rest of the things in place now. Size was done earlier in
7600          * previous loop prior to padding.
7601          */
7602
7603 #ifdef SCTP_ASOCLOG_OF_TSNS
7604         SCTP_TCB_LOCK_ASSERT(stcb);
7605         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7606                 asoc->tsn_out_at = 0;
7607                 asoc->tsn_out_wrapped = 1;
7608         }
7609         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7610         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7611         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7612         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7613         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7614         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7615         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7616         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7617         asoc->tsn_out_at++;
7618 #endif
7619         if (stcb->asoc.idata_supported == 0) {
7620                 dchkh->ch.chunk_type = SCTP_DATA;
7621                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7622                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7623                 dchkh->dp.sid = htons(strq->sid);
7624                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7625                 dchkh->dp.ppid = chk->rec.data.ppid;
7626                 dchkh->ch.chunk_length = htons(chk->send_size);
7627         } else {
7628                 ndchkh->ch.chunk_type = SCTP_IDATA;
7629                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7630                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7631                 ndchkh->dp.sid = htons(strq->sid);
7632                 ndchkh->dp.reserved = htons(0);
7633                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7634                 if (sp->fsn == 0)
7635                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7636                 else
7637                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7638                 sp->fsn++;
7639                 ndchkh->ch.chunk_length = htons(chk->send_size);
7640         }
7641         /* Now advance the chk->send_size by the actual pad needed. */
7642         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7643                 /* need a pad */
7644                 struct mbuf *lm;
7645                 int pads;
7646
7647                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7648                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7649                 if (lm != NULL) {
7650                         chk->last_mbuf = lm;
7651                         chk->pad_inplace = 1;
7652                 }
7653                 chk->send_size += pads;
7654         }
7655         if (PR_SCTP_ENABLED(chk->flags)) {
7656                 asoc->pr_sctp_cnt++;
7657         }
7658         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7659                 /* All done pull and kill the message */
7660                 if (sp->put_last_out == 0) {
7661                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7662                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7663                             sp->sender_all_done,
7664                             sp->length,
7665                             sp->msg_is_complete,
7666                             sp->put_last_out,
7667                             send_lock_up);
7668                 }
7669                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7670                         SCTP_TCB_SEND_LOCK(stcb);
7671                         send_lock_up = 1;
7672                 }
7673                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7674                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7675                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7676                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7677                     (strq->chunks_on_queues == 0) &&
7678                     TAILQ_EMPTY(&strq->outqueue)) {
7679                         stcb->asoc.trigger_reset = 1;
7680                 }
7681                 if (sp->net) {
7682                         sctp_free_remote_addr(sp->net);
7683                         sp->net = NULL;
7684                 }
7685                 if (sp->data) {
7686                         sctp_m_freem(sp->data);
7687                         sp->data = NULL;
7688                 }
7689                 sctp_free_a_strmoq(stcb, sp, so_locked);
7690         }
7691         asoc->chunks_on_out_queue++;
7692         strq->chunks_on_queues++;
7693         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7694         asoc->send_queue_cnt++;
7695 out_of:
7696         if (send_lock_up) {
7697                 SCTP_TCB_SEND_UNLOCK(stcb);
7698         }
7699         return (to_move);
7700 }
7701
7702
7703 static void
7704 sctp_fill_outqueue(struct sctp_tcb *stcb,
7705     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7706 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7707     SCTP_UNUSED
7708 #endif
7709 )
7710 {
7711         struct sctp_association *asoc;
7712         struct sctp_stream_out *strq;
7713         uint32_t space_left, moved, total_moved;
7714         int bail, giveup;
7715
7716         SCTP_TCB_LOCK_ASSERT(stcb);
7717         asoc = &stcb->asoc;
7718         total_moved = 0;
7719         switch (net->ro._l_addr.sa.sa_family) {
7720 #ifdef INET
7721         case AF_INET:
7722                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7723                 break;
7724 #endif
7725 #ifdef INET6
7726         case AF_INET6:
7727                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7728                 break;
7729 #endif
7730         default:
7731                 /* TSNH */
7732                 space_left = net->mtu;
7733                 break;
7734         }
7735         /* Need an allowance for the data chunk header too */
7736         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7737
7738         /* must make even word boundary */
7739         space_left &= 0xfffffffc;
7740         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7741         giveup = 0;
7742         bail = 0;
7743         while ((space_left > 0) && (strq != NULL)) {
7744                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7745                     &giveup, eeor_mode, &bail, so_locked);
7746                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7747                 if ((giveup != 0) || (bail != 0)) {
7748                         break;
7749                 }
7750                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7751                 total_moved += moved;
7752                 space_left -= moved;
7753                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7754                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7755                 } else {
7756                         space_left = 0;
7757                 }
7758                 space_left &= 0xfffffffc;
7759         }
7760         if (bail != 0)
7761                 *quit_now = 1;
7762
7763         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7764
7765         if (total_moved == 0) {
7766                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7767                     (net == stcb->asoc.primary_destination)) {
7768                         /* ran dry for primary network net */
7769                         SCTP_STAT_INCR(sctps_primary_randry);
7770                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7771                         /* ran dry with CMT on */
7772                         SCTP_STAT_INCR(sctps_cmt_randry);
7773                 }
7774         }
7775 }
7776
7777 void
7778 sctp_fix_ecn_echo(struct sctp_association *asoc)
7779 {
7780         struct sctp_tmit_chunk *chk;
7781
7782         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7783                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7784                         chk->sent = SCTP_DATAGRAM_UNSENT;
7785                 }
7786         }
7787 }
7788
7789 void
7790 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7791 {
7792         struct sctp_association *asoc;
7793         struct sctp_tmit_chunk *chk;
7794         struct sctp_stream_queue_pending *sp;
7795         unsigned int i;
7796
7797         if (net == NULL) {
7798                 return;
7799         }
7800         asoc = &stcb->asoc;
7801         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7802                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7803                         if (sp->net == net) {
7804                                 sctp_free_remote_addr(sp->net);
7805                                 sp->net = NULL;
7806                         }
7807                 }
7808         }
7809         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7810                 if (chk->whoTo == net) {
7811                         sctp_free_remote_addr(chk->whoTo);
7812                         chk->whoTo = NULL;
7813                 }
7814         }
7815 }
7816
7817 int
7818 sctp_med_chunk_output(struct sctp_inpcb *inp,
7819     struct sctp_tcb *stcb,
7820     struct sctp_association *asoc,
7821     int *num_out,
7822     int *reason_code,
7823     int control_only, int from_where,
7824     struct timeval *now, int *now_filled, int frag_point, int so_locked
7825 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7826     SCTP_UNUSED
7827 #endif
7828 )
7829 {
7830         /**
7831          * Ok this is the generic chunk service queue. we must do the
7832          * following:
7833          * - Service the stream queue that is next, moving any
7834          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7835          *   LAST to the out queue in one pass) and assigning TSN's. This
7836          *   only applys though if the peer does not support NDATA. For NDATA
7837          *   chunks its ok to not send the entire message ;-)
7838          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7839          *   fomulate and send the low level chunks. Making sure to combine
7840          *   any control in the control chunk queue also.
7841          */
7842         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7843         struct mbuf *outchain, *endoutchain;
7844         struct sctp_tmit_chunk *chk, *nchk;
7845
7846         /* temp arrays for unlinking */
7847         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7848         int no_fragmentflg, error;
7849         unsigned int max_rwnd_per_dest, max_send_per_dest;
7850         int one_chunk, hbflag, skip_data_for_this_net;
7851         int asconf, cookie, no_out_cnt;
7852         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7853         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7854         int tsns_sent = 0;
7855         uint32_t auth_offset = 0;
7856         struct sctp_auth_chunk *auth = NULL;
7857         uint16_t auth_keyid;
7858         int override_ok = 1;
7859         int skip_fill_up = 0;
7860         int data_auth_reqd = 0;
7861
7862         /*
7863          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7864          * destination.
7865          */
7866         int quit_now = 0;
7867
7868         *num_out = 0;
7869         *reason_code = 0;
7870         auth_keyid = stcb->asoc.authinfo.active_keyid;
7871         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7872             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7873             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7874                 eeor_mode = 1;
7875         } else {
7876                 eeor_mode = 0;
7877         }
7878         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7879         /*
7880          * First lets prime the pump. For each destination, if there is room
7881          * in the flight size, attempt to pull an MTU's worth out of the
7882          * stream queues into the general send_queue
7883          */
7884 #ifdef SCTP_AUDITING_ENABLED
7885         sctp_audit_log(0xC2, 2);
7886 #endif
7887         SCTP_TCB_LOCK_ASSERT(stcb);
7888         hbflag = 0;
7889         if (control_only)
7890                 no_data_chunks = 1;
7891         else
7892                 no_data_chunks = 0;
7893
7894         /* Nothing to possible to send? */
7895         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7896             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7897             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7898             TAILQ_EMPTY(&asoc->send_queue) &&
7899             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7900 nothing_to_send:
7901                 *reason_code = 9;
7902                 return (0);
7903         }
7904         if (asoc->peers_rwnd == 0) {
7905                 /* No room in peers rwnd */
7906                 *reason_code = 1;
7907                 if (asoc->total_flight > 0) {
7908                         /* we are allowed one chunk in flight */
7909                         no_data_chunks = 1;
7910                 }
7911         }
7912         if (stcb->asoc.ecn_echo_cnt_onq) {
7913                 /* Record where a sack goes, if any */
7914                 if (no_data_chunks &&
7915                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7916                         /* Nothing but ECNe to send - we don't do that */
7917                         goto nothing_to_send;
7918                 }
7919                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7920                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7921                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7922                                 sack_goes_to = chk->whoTo;
7923                                 break;
7924                         }
7925                 }
7926         }
7927         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7928         if (stcb->sctp_socket)
7929                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7930         else
7931                 max_send_per_dest = 0;
7932         if (no_data_chunks == 0) {
7933                 /* How many non-directed chunks are there? */
7934                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7935                         if (chk->whoTo == NULL) {
7936                                 /*
7937                                  * We already have non-directed chunks on
7938                                  * the queue, no need to do a fill-up.
7939                                  */
7940                                 skip_fill_up = 1;
7941                                 break;
7942                         }
7943                 }
7944
7945         }
7946         if ((no_data_chunks == 0) &&
7947             (skip_fill_up == 0) &&
7948             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7949                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7950                         /*
7951                          * This for loop we are in takes in each net, if
7952                          * its's got space in cwnd and has data sent to it
7953                          * (when CMT is off) then it calls
7954                          * sctp_fill_outqueue for the net. This gets data on
7955                          * the send queue for that network.
7956                          *
7957                          * In sctp_fill_outqueue TSN's are assigned and data
7958                          * is copied out of the stream buffers. Note mostly
7959                          * copy by reference (we hope).
7960                          */
7961                         net->window_probe = 0;
7962                         if ((net != stcb->asoc.alternate) &&
7963                             ((net->dest_state & SCTP_ADDR_PF) ||
7964                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7965                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7966                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7967                                         sctp_log_cwnd(stcb, net, 1,
7968                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7969                                 }
7970                                 continue;
7971                         }
7972                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7973                             (net->flight_size == 0)) {
7974                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7975                         }
7976                         if (net->flight_size >= net->cwnd) {
7977                                 /* skip this network, no room - can't fill */
7978                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7979                                         sctp_log_cwnd(stcb, net, 3,
7980                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7981                                 }
7982                                 continue;
7983                         }
7984                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7985                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7986                         }
7987                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7988                         if (quit_now) {
7989                                 /* memory alloc failure */
7990                                 no_data_chunks = 1;
7991                                 break;
7992                         }
7993                 }
7994         }
7995         /* now service each destination and send out what we can for it */
7996         /* Nothing to send? */
7997         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7998             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7999             TAILQ_EMPTY(&asoc->send_queue)) {
8000                 *reason_code = 8;
8001                 return (0);
8002         }
8003
8004         if (asoc->sctp_cmt_on_off > 0) {
8005                 /* get the last start point */
8006                 start_at = asoc->last_net_cmt_send_started;
8007                 if (start_at == NULL) {
8008                         /* null so to beginning */
8009                         start_at = TAILQ_FIRST(&asoc->nets);
8010                 } else {
8011                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8012                         if (start_at == NULL) {
8013                                 start_at = TAILQ_FIRST(&asoc->nets);
8014                         }
8015                 }
8016                 asoc->last_net_cmt_send_started = start_at;
8017         } else {
8018                 start_at = TAILQ_FIRST(&asoc->nets);
8019         }
8020         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8021                 if (chk->whoTo == NULL) {
8022                         if (asoc->alternate) {
8023                                 chk->whoTo = asoc->alternate;
8024                         } else {
8025                                 chk->whoTo = asoc->primary_destination;
8026                         }
8027                         atomic_add_int(&chk->whoTo->ref_count, 1);
8028                 }
8029         }
8030         old_start_at = NULL;
8031 again_one_more_time:
8032         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8033                 /* how much can we send? */
8034                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8035                 if (old_start_at && (old_start_at == net)) {
8036                         /* through list ocmpletely. */
8037                         break;
8038                 }
8039                 tsns_sent = 0xa;
8040                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8041                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8042                     (net->flight_size >= net->cwnd)) {
8043                         /*
8044                          * Nothing on control or asconf and flight is full,
8045                          * we can skip even in the CMT case.
8046                          */
8047                         continue;
8048                 }
8049                 bundle_at = 0;
8050                 endoutchain = outchain = NULL;
8051                 no_fragmentflg = 1;
8052                 one_chunk = 0;
8053                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8054                         skip_data_for_this_net = 1;
8055                 } else {
8056                         skip_data_for_this_net = 0;
8057                 }
8058                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8059 #ifdef INET
8060                 case AF_INET:
8061                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8062                         break;
8063 #endif
8064 #ifdef INET6
8065                 case AF_INET6:
8066                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8067                         break;
8068 #endif
8069                 default:
8070                         /* TSNH */
8071                         mtu = net->mtu;
8072                         break;
8073                 }
8074                 mx_mtu = mtu;
8075                 to_out = 0;
8076                 if (mtu > asoc->peers_rwnd) {
8077                         if (asoc->total_flight > 0) {
8078                                 /* We have a packet in flight somewhere */
8079                                 r_mtu = asoc->peers_rwnd;
8080                         } else {
8081                                 /* We are always allowed to send one MTU out */
8082                                 one_chunk = 1;
8083                                 r_mtu = mtu;
8084                         }
8085                 } else {
8086                         r_mtu = mtu;
8087                 }
8088                 error = 0;
8089                 /************************/
8090                 /* ASCONF transmission */
8091                 /************************/
8092                 /* Now first lets go through the asconf queue */
8093                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8094                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8095                                 continue;
8096                         }
8097                         if (chk->whoTo == NULL) {
8098                                 if (asoc->alternate == NULL) {
8099                                         if (asoc->primary_destination != net) {
8100                                                 break;
8101                                         }
8102                                 } else {
8103                                         if (asoc->alternate != net) {
8104                                                 break;
8105                                         }
8106                                 }
8107                         } else {
8108                                 if (chk->whoTo != net) {
8109                                         break;
8110                                 }
8111                         }
8112                         if (chk->data == NULL) {
8113                                 break;
8114                         }
8115                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8116                             chk->sent != SCTP_DATAGRAM_RESEND) {
8117                                 break;
8118                         }
8119                         /*
8120                          * if no AUTH is yet included and this chunk
8121                          * requires it, make sure to account for it.  We
8122                          * don't apply the size until the AUTH chunk is
8123                          * actually added below in case there is no room for
8124                          * this chunk. NOTE: we overload the use of "omtu"
8125                          * here
8126                          */
8127                         if ((auth == NULL) &&
8128                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8129                             stcb->asoc.peer_auth_chunks)) {
8130                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8131                         } else
8132                                 omtu = 0;
8133                         /* Here we do NOT factor the r_mtu */
8134                         if ((chk->send_size < (int)(mtu - omtu)) ||
8135                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8136                                 /*
8137                                  * We probably should glom the mbuf chain
8138                                  * from the chk->data for control but the
8139                                  * problem is it becomes yet one more level
8140                                  * of tracking to do if for some reason
8141                                  * output fails. Then I have got to
8142                                  * reconstruct the merged control chain.. el
8143                                  * yucko.. for now we take the easy way and
8144                                  * do the copy
8145                                  */
8146                                 /*
8147                                  * Add an AUTH chunk, if chunk requires it
8148                                  * save the offset into the chain for AUTH
8149                                  */
8150                                 if ((auth == NULL) &&
8151                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8152                                     stcb->asoc.peer_auth_chunks))) {
8153                                         outchain = sctp_add_auth_chunk(outchain,
8154                                             &endoutchain,
8155                                             &auth,
8156                                             &auth_offset,
8157                                             stcb,
8158                                             chk->rec.chunk_id.id);
8159                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8160                                 }
8161                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8162                                     (int)chk->rec.chunk_id.can_take_data,
8163                                     chk->send_size, chk->copy_by_ref);
8164                                 if (outchain == NULL) {
8165                                         *reason_code = 8;
8166                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8167                                         return (ENOMEM);
8168                                 }
8169                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8170                                 /* update our MTU size */
8171                                 if (mtu > (chk->send_size + omtu))
8172                                         mtu -= (chk->send_size + omtu);
8173                                 else
8174                                         mtu = 0;
8175                                 to_out += (chk->send_size + omtu);
8176                                 /* Do clear IP_DF ? */
8177                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8178                                         no_fragmentflg = 0;
8179                                 }
8180                                 if (chk->rec.chunk_id.can_take_data)
8181                                         chk->data = NULL;
8182                                 /*
8183                                  * set hb flag since we can use these for
8184                                  * RTO
8185                                  */
8186                                 hbflag = 1;
8187                                 asconf = 1;
8188                                 /*
8189                                  * should sysctl this: don't bundle data
8190                                  * with ASCONF since it requires AUTH
8191                                  */
8192                                 no_data_chunks = 1;
8193                                 chk->sent = SCTP_DATAGRAM_SENT;
8194                                 if (chk->whoTo == NULL) {
8195                                         chk->whoTo = net;
8196                                         atomic_add_int(&net->ref_count, 1);
8197                                 }
8198                                 chk->snd_count++;
8199                                 if (mtu == 0) {
8200                                         /*
8201                                          * Ok we are out of room but we can
8202                                          * output without effecting the
8203                                          * flight size since this little guy
8204                                          * is a control only packet.
8205                                          */
8206                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8207                                         /*
8208                                          * do NOT clear the asconf flag as
8209                                          * it is used to do appropriate
8210                                          * source address selection.
8211                                          */
8212                                         if (*now_filled == 0) {
8213                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8214                                                 *now_filled = 1;
8215                                         }
8216                                         net->last_sent_time = *now;
8217                                         hbflag = 0;
8218                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8219                                             (struct sockaddr *)&net->ro._l_addr,
8220                                             outchain, auth_offset, auth,
8221                                             stcb->asoc.authinfo.active_keyid,
8222                                             no_fragmentflg, 0, asconf,
8223                                             inp->sctp_lport, stcb->rport,
8224                                             htonl(stcb->asoc.peer_vtag),
8225                                             net->port, NULL,
8226                                             0, 0,
8227                                             so_locked))) {
8228                                                 /*
8229                                                  * error, we could not
8230                                                  * output
8231                                                  */
8232                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8233                                                 if (from_where == 0) {
8234                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8235                                                 }
8236                                                 if (error == ENOBUFS) {
8237                                                         asoc->ifp_had_enobuf = 1;
8238                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8239                                                 }
8240                                                 /* error, could not output */
8241                                                 if (error == EHOSTUNREACH) {
8242                                                         /*
8243                                                          * Destination went
8244                                                          * unreachable
8245                                                          * during this send
8246                                                          */
8247                                                         sctp_move_chunks_from_net(stcb, net);
8248                                                 }
8249                                                 *reason_code = 7;
8250                                                 break;
8251                                         } else {
8252                                                 asoc->ifp_had_enobuf = 0;
8253                                         }
8254                                         /*
8255                                          * increase the number we sent, if a
8256                                          * cookie is sent we don't tell them
8257                                          * any was sent out.
8258                                          */
8259                                         outchain = endoutchain = NULL;
8260                                         auth = NULL;
8261                                         auth_offset = 0;
8262                                         if (!no_out_cnt)
8263                                                 *num_out += ctl_cnt;
8264                                         /* recalc a clean slate and setup */
8265                                         switch (net->ro._l_addr.sa.sa_family) {
8266 #ifdef INET
8267                                         case AF_INET:
8268                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8269                                                 break;
8270 #endif
8271 #ifdef INET6
8272                                         case AF_INET6:
8273                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8274                                                 break;
8275 #endif
8276                                         default:
8277                                                 /* TSNH */
8278                                                 mtu = net->mtu;
8279                                                 break;
8280                                         }
8281                                         to_out = 0;
8282                                         no_fragmentflg = 1;
8283                                 }
8284                         }
8285                 }
8286                 if (error != 0) {
8287                         /* try next net */
8288                         continue;
8289                 }
8290                 /************************/
8291                 /* Control transmission */
8292                 /************************/
8293                 /* Now first lets go through the control queue */
8294                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8295                         if ((sack_goes_to) &&
8296                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8297                             (chk->whoTo != sack_goes_to)) {
8298                                 /*
8299                                  * if we have a sack in queue, and we are
8300                                  * looking at an ecn echo that is NOT queued
8301                                  * to where the sack is going..
8302                                  */
8303                                 if (chk->whoTo == net) {
8304                                         /*
8305                                          * Don't transmit it to where its
8306                                          * going (current net)
8307                                          */
8308                                         continue;
8309                                 } else if (sack_goes_to == net) {
8310                                         /*
8311                                          * But do transmit it to this
8312                                          * address
8313                                          */
8314                                         goto skip_net_check;
8315                                 }
8316                         }
8317                         if (chk->whoTo == NULL) {
8318                                 if (asoc->alternate == NULL) {
8319                                         if (asoc->primary_destination != net) {
8320                                                 continue;
8321                                         }
8322                                 } else {
8323                                         if (asoc->alternate != net) {
8324                                                 continue;
8325                                         }
8326                                 }
8327                         } else {
8328                                 if (chk->whoTo != net) {
8329                                         continue;
8330                                 }
8331                         }
8332         skip_net_check:
8333                         if (chk->data == NULL) {
8334                                 continue;
8335                         }
8336                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8337                                 /*
8338                                  * It must be unsent. Cookies and ASCONF's
8339                                  * hang around but there timers will force
8340                                  * when marked for resend.
8341                                  */
8342                                 continue;
8343                         }
8344                         /*
8345                          * if no AUTH is yet included and this chunk
8346                          * requires it, make sure to account for it.  We
8347                          * don't apply the size until the AUTH chunk is
8348                          * actually added below in case there is no room for
8349                          * this chunk. NOTE: we overload the use of "omtu"
8350                          * here
8351                          */
8352                         if ((auth == NULL) &&
8353                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8354                             stcb->asoc.peer_auth_chunks)) {
8355                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8356                         } else
8357                                 omtu = 0;
8358                         /* Here we do NOT factor the r_mtu */
8359                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8360                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8361                                 /*
8362                                  * We probably should glom the mbuf chain
8363                                  * from the chk->data for control but the
8364                                  * problem is it becomes yet one more level
8365                                  * of tracking to do if for some reason
8366                                  * output fails. Then I have got to
8367                                  * reconstruct the merged control chain.. el
8368                                  * yucko.. for now we take the easy way and
8369                                  * do the copy
8370                                  */
8371                                 /*
8372                                  * Add an AUTH chunk, if chunk requires it
8373                                  * save the offset into the chain for AUTH
8374                                  */
8375                                 if ((auth == NULL) &&
8376                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8377                                     stcb->asoc.peer_auth_chunks))) {
8378                                         outchain = sctp_add_auth_chunk(outchain,
8379                                             &endoutchain,
8380                                             &auth,
8381                                             &auth_offset,
8382                                             stcb,
8383                                             chk->rec.chunk_id.id);
8384                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8385                                 }
8386                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8387                                     (int)chk->rec.chunk_id.can_take_data,
8388                                     chk->send_size, chk->copy_by_ref);
8389                                 if (outchain == NULL) {
8390                                         *reason_code = 8;
8391                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8392                                         return (ENOMEM);
8393                                 }
8394                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8395                                 /* update our MTU size */
8396                                 if (mtu > (chk->send_size + omtu))
8397                                         mtu -= (chk->send_size + omtu);
8398                                 else
8399                                         mtu = 0;
8400                                 to_out += (chk->send_size + omtu);
8401                                 /* Do clear IP_DF ? */
8402                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8403                                         no_fragmentflg = 0;
8404                                 }
8405                                 if (chk->rec.chunk_id.can_take_data)
8406                                         chk->data = NULL;
8407                                 /* Mark things to be removed, if needed */
8408                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8409                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8410                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8411                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8412                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8413                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8414                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8415                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8416                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8417                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8418                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8419                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8420                                                 hbflag = 1;
8421                                         }
8422                                         /* remove these chunks at the end */
8423                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8424                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8425                                                 /* turn off the timer */
8426                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8427                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8428                                                             inp, stcb, net,
8429                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8430                                                 }
8431                                         }
8432                                         ctl_cnt++;
8433                                 } else {
8434                                         /*
8435                                          * Other chunks, since they have
8436                                          * timers running (i.e. COOKIE) we
8437                                          * just "trust" that it gets sent or
8438                                          * retransmitted.
8439                                          */
8440                                         ctl_cnt++;
8441                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8442                                                 cookie = 1;
8443                                                 no_out_cnt = 1;
8444                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8445                                                 /*
8446                                                  * Increment ecne send count
8447                                                  * here this means we may be
8448                                                  * over-zealous in our
8449                                                  * counting if the send
8450                                                  * fails, but its the best
8451                                                  * place to do it (we used
8452                                                  * to do it in the queue of
8453                                                  * the chunk, but that did
8454                                                  * not tell how many times
8455                                                  * it was sent.
8456                                                  */
8457                                                 SCTP_STAT_INCR(sctps_sendecne);
8458                                         }
8459                                         chk->sent = SCTP_DATAGRAM_SENT;
8460                                         if (chk->whoTo == NULL) {
8461                                                 chk->whoTo = net;
8462                                                 atomic_add_int(&net->ref_count, 1);
8463                                         }
8464                                         chk->snd_count++;
8465                                 }
8466                                 if (mtu == 0) {
8467                                         /*
8468                                          * Ok we are out of room but we can
8469                                          * output without effecting the
8470                                          * flight size since this little guy
8471                                          * is a control only packet.
8472                                          */
8473                                         if (asconf) {
8474                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8475                                                 /*
8476                                                  * do NOT clear the asconf
8477                                                  * flag as it is used to do
8478                                                  * appropriate source
8479                                                  * address selection.
8480                                                  */
8481                                         }
8482                                         if (cookie) {
8483                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8484                                                 cookie = 0;
8485                                         }
8486                                         /* Only HB or ASCONF advances time */
8487                                         if (hbflag) {
8488                                                 if (*now_filled == 0) {
8489                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8490                                                         *now_filled = 1;
8491                                                 }
8492                                                 net->last_sent_time = *now;
8493                                                 hbflag = 0;
8494                                         }
8495                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8496                                             (struct sockaddr *)&net->ro._l_addr,
8497                                             outchain,
8498                                             auth_offset, auth,
8499                                             stcb->asoc.authinfo.active_keyid,
8500                                             no_fragmentflg, 0, asconf,
8501                                             inp->sctp_lport, stcb->rport,
8502                                             htonl(stcb->asoc.peer_vtag),
8503                                             net->port, NULL,
8504                                             0, 0,
8505                                             so_locked))) {
8506                                                 /*
8507                                                  * error, we could not
8508                                                  * output
8509                                                  */
8510                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8511                                                 if (from_where == 0) {
8512                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8513                                                 }
8514                                                 if (error == ENOBUFS) {
8515                                                         asoc->ifp_had_enobuf = 1;
8516                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8517                                                 }
8518                                                 if (error == EHOSTUNREACH) {
8519                                                         /*
8520                                                          * Destination went
8521                                                          * unreachable
8522                                                          * during this send
8523                                                          */
8524                                                         sctp_move_chunks_from_net(stcb, net);
8525                                                 }
8526                                                 *reason_code = 7;
8527                                                 break;
8528                                         } else {
8529                                                 asoc->ifp_had_enobuf = 0;
8530                                         }
8531                                         /*
8532                                          * increase the number we sent, if a
8533                                          * cookie is sent we don't tell them
8534                                          * any was sent out.
8535                                          */
8536                                         outchain = endoutchain = NULL;
8537                                         auth = NULL;
8538                                         auth_offset = 0;
8539                                         if (!no_out_cnt)
8540                                                 *num_out += ctl_cnt;
8541                                         /* recalc a clean slate and setup */
8542                                         switch (net->ro._l_addr.sa.sa_family) {
8543 #ifdef INET
8544                                         case AF_INET:
8545                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8546                                                 break;
8547 #endif
8548 #ifdef INET6
8549                                         case AF_INET6:
8550                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8551                                                 break;
8552 #endif
8553                                         default:
8554                                                 /* TSNH */
8555                                                 mtu = net->mtu;
8556                                                 break;
8557                                         }
8558                                         to_out = 0;
8559                                         no_fragmentflg = 1;
8560                                 }
8561                         }
8562                 }
8563                 if (error != 0) {
8564                         /* try next net */
8565                         continue;
8566                 }
8567                 /* JRI: if dest is in PF state, do not send data to it */
8568                 if ((asoc->sctp_cmt_on_off > 0) &&
8569                     (net != stcb->asoc.alternate) &&
8570                     (net->dest_state & SCTP_ADDR_PF)) {
8571                         goto no_data_fill;
8572                 }
8573                 if (net->flight_size >= net->cwnd) {
8574                         goto no_data_fill;
8575                 }
8576                 if ((asoc->sctp_cmt_on_off > 0) &&
8577                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8578                     (net->flight_size > max_rwnd_per_dest)) {
8579                         goto no_data_fill;
8580                 }
8581                 /*
8582                  * We need a specific accounting for the usage of the send
8583                  * buffer. We also need to check the number of messages per
8584                  * net. For now, this is better than nothing and it disabled
8585                  * by default...
8586                  */
8587                 if ((asoc->sctp_cmt_on_off > 0) &&
8588                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8589                     (max_send_per_dest > 0) &&
8590                     (net->flight_size > max_send_per_dest)) {
8591                         goto no_data_fill;
8592                 }
8593                 /*********************/
8594                 /* Data transmission */
8595                 /*********************/
8596                 /*
8597                  * if AUTH for DATA is required and no AUTH has been added
8598                  * yet, account for this in the mtu now... if no data can be
8599                  * bundled, this adjustment won't matter anyways since the
8600                  * packet will be going out...
8601                  */
8602                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8603                     stcb->asoc.peer_auth_chunks);
8604                 if (data_auth_reqd && (auth == NULL)) {
8605                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8606                 }
8607                 /* now lets add any data within the MTU constraints */
8608                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8609 #ifdef INET
8610                 case AF_INET:
8611                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8612                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8613                         else
8614                                 omtu = 0;
8615                         break;
8616 #endif
8617 #ifdef INET6
8618                 case AF_INET6:
8619                         if (net->mtu > SCTP_MIN_OVERHEAD)
8620                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8621                         else
8622                                 omtu = 0;
8623                         break;
8624 #endif
8625                 default:
8626                         /* TSNH */
8627                         omtu = 0;
8628                         break;
8629                 }
8630                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8631                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8632                     (skip_data_for_this_net == 0)) ||
8633                     (cookie)) {
8634                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8635                                 if (no_data_chunks) {
8636                                         /* let only control go out */
8637                                         *reason_code = 1;
8638                                         break;
8639                                 }
8640                                 if (net->flight_size >= net->cwnd) {
8641                                         /* skip this net, no room for data */
8642                                         *reason_code = 2;
8643                                         break;
8644                                 }
8645                                 if ((chk->whoTo != NULL) &&
8646                                     (chk->whoTo != net)) {
8647                                         /* Don't send the chunk on this net */
8648                                         continue;
8649                                 }
8650
8651                                 if (asoc->sctp_cmt_on_off == 0) {
8652                                         if ((asoc->alternate) &&
8653                                             (asoc->alternate != net) &&
8654                                             (chk->whoTo == NULL)) {
8655                                                 continue;
8656                                         } else if ((net != asoc->primary_destination) &&
8657                                                     (asoc->alternate == NULL) &&
8658                                             (chk->whoTo == NULL)) {
8659                                                 continue;
8660                                         }
8661                                 }
8662                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8663                                         /*-
8664                                          * strange, we have a chunk that is
8665                                          * to big for its destination and
8666                                          * yet no fragment ok flag.
8667                                          * Something went wrong when the
8668                                          * PMTU changed...we did not mark
8669                                          * this chunk for some reason?? I
8670                                          * will fix it here by letting IP
8671                                          * fragment it for now and printing
8672                                          * a warning. This really should not
8673                                          * happen ...
8674                                          */
8675                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8676                                             chk->send_size, mtu);
8677                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8678                                 }
8679                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8680                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8681                                         struct sctp_data_chunk *dchkh;
8682
8683                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8684                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8685                                 }
8686                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8687                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8688                                         /* ok we will add this one */
8689
8690                                         /*
8691                                          * Add an AUTH chunk, if chunk
8692                                          * requires it, save the offset into
8693                                          * the chain for AUTH
8694                                          */
8695                                         if (data_auth_reqd) {
8696                                                 if (auth == NULL) {
8697                                                         outchain = sctp_add_auth_chunk(outchain,
8698                                                             &endoutchain,
8699                                                             &auth,
8700                                                             &auth_offset,
8701                                                             stcb,
8702                                                             SCTP_DATA);
8703                                                         auth_keyid = chk->auth_keyid;
8704                                                         override_ok = 0;
8705                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8706                                                 } else if (override_ok) {
8707                                                         /*
8708                                                          * use this data's
8709                                                          * keyid
8710                                                          */
8711                                                         auth_keyid = chk->auth_keyid;
8712                                                         override_ok = 0;
8713                                                 } else if (auth_keyid != chk->auth_keyid) {
8714                                                         /*
8715                                                          * different keyid,
8716                                                          * so done bundling
8717                                                          */
8718                                                         break;
8719                                                 }
8720                                         }
8721                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8722                                             chk->send_size, chk->copy_by_ref);
8723                                         if (outchain == NULL) {
8724                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8725                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8726                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8727                                                 }
8728                                                 *reason_code = 3;
8729                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8730                                                 return (ENOMEM);
8731                                         }
8732                                         /* upate our MTU size */
8733                                         /* Do clear IP_DF ? */
8734                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8735                                                 no_fragmentflg = 0;
8736                                         }
8737                                         /* unsigned subtraction of mtu */
8738                                         if (mtu > chk->send_size)
8739                                                 mtu -= chk->send_size;
8740                                         else
8741                                                 mtu = 0;
8742                                         /* unsigned subtraction of r_mtu */
8743                                         if (r_mtu > chk->send_size)
8744                                                 r_mtu -= chk->send_size;
8745                                         else
8746                                                 r_mtu = 0;
8747
8748                                         to_out += chk->send_size;
8749                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8750 #ifdef INVARIANTS
8751                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8752 #else
8753                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8754                                                     mx_mtu, to_out);
8755 #endif
8756                                         }
8757                                         chk->window_probe = 0;
8758                                         data_list[bundle_at++] = chk;
8759                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8760                                                 break;
8761                                         }
8762                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8763                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8764                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8765                                                 } else {
8766                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8767                                                 }
8768                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8769                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8770                                                         /*
8771                                                          * Count number of
8772                                                          * user msg's that
8773                                                          * were fragmented
8774                                                          * we do this by
8775                                                          * counting when we
8776                                                          * see a LAST
8777                                                          * fragment only.
8778                                                          */
8779                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8780                                         }
8781                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8782                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8783                                                         data_list[0]->window_probe = 1;
8784                                                         net->window_probe = 1;
8785                                                 }
8786                                                 break;
8787                                         }
8788                                 } else {
8789                                         /*
8790                                          * Must be sent in order of the
8791                                          * TSN's (on a network)
8792                                          */
8793                                         break;
8794                                 }
8795                         }       /* for (chunk gather loop for this net) */
8796                 }               /* if asoc.state OPEN */
8797 no_data_fill:
8798                 /* Is there something to send for this destination? */
8799                 if (outchain) {
8800                         /* We may need to start a control timer or two */
8801                         if (asconf) {
8802                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8803                                     stcb, net);
8804                                 /*
8805                                  * do NOT clear the asconf flag as it is
8806                                  * used to do appropriate source address
8807                                  * selection.
8808                                  */
8809                         }
8810                         if (cookie) {
8811                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8812                                 cookie = 0;
8813                         }
8814                         /* must start a send timer if data is being sent */
8815                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8816                                 /*
8817                                  * no timer running on this destination
8818                                  * restart it.
8819                                  */
8820                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8821                         }
8822                         if (bundle_at || hbflag) {
8823                                 /* For data/asconf and hb set time */
8824                                 if (*now_filled == 0) {
8825                                         (void)SCTP_GETTIME_TIMEVAL(now);
8826                                         *now_filled = 1;
8827                                 }
8828                                 net->last_sent_time = *now;
8829                         }
8830                         /* Now send it, if there is anything to send :> */
8831                         if ((error = sctp_lowlevel_chunk_output(inp,
8832                             stcb,
8833                             net,
8834                             (struct sockaddr *)&net->ro._l_addr,
8835                             outchain,
8836                             auth_offset,
8837                             auth,
8838                             auth_keyid,
8839                             no_fragmentflg,
8840                             bundle_at,
8841                             asconf,
8842                             inp->sctp_lport, stcb->rport,
8843                             htonl(stcb->asoc.peer_vtag),
8844                             net->port, NULL,
8845                             0, 0,
8846                             so_locked))) {
8847                                 /* error, we could not output */
8848                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8849                                 if (from_where == 0) {
8850                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8851                                 }
8852                                 if (error == ENOBUFS) {
8853                                         asoc->ifp_had_enobuf = 1;
8854                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8855                                 }
8856                                 if (error == EHOSTUNREACH) {
8857                                         /*
8858                                          * Destination went unreachable
8859                                          * during this send
8860                                          */
8861                                         sctp_move_chunks_from_net(stcb, net);
8862                                 }
8863                                 *reason_code = 6;
8864                                 /*-
8865                                  * I add this line to be paranoid. As far as
8866                                  * I can tell the continue, takes us back to
8867                                  * the top of the for, but just to make sure
8868                                  * I will reset these again here.
8869                                  */
8870                                 ctl_cnt = bundle_at = 0;
8871                                 continue;       /* This takes us back to the
8872                                                  * for() for the nets. */
8873                         } else {
8874                                 asoc->ifp_had_enobuf = 0;
8875                         }
8876                         endoutchain = NULL;
8877                         auth = NULL;
8878                         auth_offset = 0;
8879                         if (!no_out_cnt) {
8880                                 *num_out += (ctl_cnt + bundle_at);
8881                         }
8882                         if (bundle_at) {
8883                                 /* setup for a RTO measurement */
8884                                 tsns_sent = data_list[0]->rec.data.tsn;
8885                                 /* fill time if not already filled */
8886                                 if (*now_filled == 0) {
8887                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8888                                         *now_filled = 1;
8889                                         *now = asoc->time_last_sent;
8890                                 } else {
8891                                         asoc->time_last_sent = *now;
8892                                 }
8893                                 if (net->rto_needed) {
8894                                         data_list[0]->do_rtt = 1;
8895                                         net->rto_needed = 0;
8896                                 }
8897                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8898                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8899                         }
8900                         if (one_chunk) {
8901                                 break;
8902                         }
8903                 }
8904                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8905                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8906                 }
8907         }
8908         if (old_start_at == NULL) {
8909                 old_start_at = start_at;
8910                 start_at = TAILQ_FIRST(&asoc->nets);
8911                 if (old_start_at)
8912                         goto again_one_more_time;
8913         }
8914
8915         /*
8916          * At the end there should be no NON timed chunks hanging on this
8917          * queue.
8918          */
8919         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8920                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8921         }
8922         if ((*num_out == 0) && (*reason_code == 0)) {
8923                 *reason_code = 4;
8924         } else {
8925                 *reason_code = 5;
8926         }
8927         sctp_clean_up_ctl(stcb, asoc, so_locked);
8928         return (0);
8929 }
8930
8931 void
8932 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8933 {
8934         /*-
8935          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8936          * the control chunk queue.
8937          */
8938         struct sctp_chunkhdr *hdr;
8939         struct sctp_tmit_chunk *chk;
8940         struct mbuf *mat, *last_mbuf;
8941         uint32_t chunk_length;
8942         uint16_t padding_length;
8943
8944         SCTP_TCB_LOCK_ASSERT(stcb);
8945         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8946         if (op_err == NULL) {
8947                 return;
8948         }
8949         last_mbuf = NULL;
8950         chunk_length = 0;
8951         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8952                 chunk_length += SCTP_BUF_LEN(mat);
8953                 if (SCTP_BUF_NEXT(mat) == NULL) {
8954                         last_mbuf = mat;
8955                 }
8956         }
8957         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8958                 sctp_m_freem(op_err);
8959                 return;
8960         }
8961         padding_length = chunk_length % 4;
8962         if (padding_length != 0) {
8963                 padding_length = 4 - padding_length;
8964         }
8965         if (padding_length != 0) {
8966                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8967                         sctp_m_freem(op_err);
8968                         return;
8969                 }
8970         }
8971         sctp_alloc_a_chunk(stcb, chk);
8972         if (chk == NULL) {
8973                 /* no memory */
8974                 sctp_m_freem(op_err);
8975                 return;
8976         }
8977         chk->copy_by_ref = 0;
8978         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8979         chk->rec.chunk_id.can_take_data = 0;
8980         chk->flags = 0;
8981         chk->send_size = (uint16_t)chunk_length;
8982         chk->sent = SCTP_DATAGRAM_UNSENT;
8983         chk->snd_count = 0;
8984         chk->asoc = &stcb->asoc;
8985         chk->data = op_err;
8986         chk->whoTo = NULL;
8987         hdr = mtod(op_err, struct sctp_chunkhdr *);
8988         hdr->chunk_type = SCTP_OPERATION_ERROR;
8989         hdr->chunk_flags = 0;
8990         hdr->chunk_length = htons(chk->send_size);
8991         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8992         chk->asoc->ctrl_queue_cnt++;
8993 }
8994
8995 int
8996 sctp_send_cookie_echo(struct mbuf *m,
8997     int offset,
8998     struct sctp_tcb *stcb,
8999     struct sctp_nets *net)
9000 {
9001         /*-
9002          * pull out the cookie and put it at the front of the control chunk
9003          * queue.
9004          */
9005         int at;
9006         struct mbuf *cookie;
9007         struct sctp_paramhdr param, *phdr;
9008         struct sctp_chunkhdr *hdr;
9009         struct sctp_tmit_chunk *chk;
9010         uint16_t ptype, plen;
9011
9012         SCTP_TCB_LOCK_ASSERT(stcb);
9013         /* First find the cookie in the param area */
9014         cookie = NULL;
9015         at = offset + sizeof(struct sctp_init_chunk);
9016         for (;;) {
9017                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9018                 if (phdr == NULL) {
9019                         return (-3);
9020                 }
9021                 ptype = ntohs(phdr->param_type);
9022                 plen = ntohs(phdr->param_length);
9023                 if (ptype == SCTP_STATE_COOKIE) {
9024                         int pad;
9025
9026                         /* found the cookie */
9027                         if ((pad = (plen % 4))) {
9028                                 plen += 4 - pad;
9029                         }
9030                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9031                         if (cookie == NULL) {
9032                                 /* No memory */
9033                                 return (-2);
9034                         }
9035 #ifdef SCTP_MBUF_LOGGING
9036                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9037                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9038                         }
9039 #endif
9040                         break;
9041                 }
9042                 at += SCTP_SIZE32(plen);
9043         }
9044         /* ok, we got the cookie lets change it into a cookie echo chunk */
9045         /* first the change from param to cookie */
9046         hdr = mtod(cookie, struct sctp_chunkhdr *);
9047         hdr->chunk_type = SCTP_COOKIE_ECHO;
9048         hdr->chunk_flags = 0;
9049         /* get the chunk stuff now and place it in the FRONT of the queue */
9050         sctp_alloc_a_chunk(stcb, chk);
9051         if (chk == NULL) {
9052                 /* no memory */
9053                 sctp_m_freem(cookie);
9054                 return (-5);
9055         }
9056         chk->copy_by_ref = 0;
9057         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9058         chk->rec.chunk_id.can_take_data = 0;
9059         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9060         chk->send_size = plen;
9061         chk->sent = SCTP_DATAGRAM_UNSENT;
9062         chk->snd_count = 0;
9063         chk->asoc = &stcb->asoc;
9064         chk->data = cookie;
9065         chk->whoTo = net;
9066         atomic_add_int(&chk->whoTo->ref_count, 1);
9067         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9068         chk->asoc->ctrl_queue_cnt++;
9069         return (0);
9070 }
9071
9072 void
9073 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9074     struct mbuf *m,
9075     int offset,
9076     int chk_length,
9077     struct sctp_nets *net)
9078 {
9079         /*
9080          * take a HB request and make it into a HB ack and send it.
9081          */
9082         struct mbuf *outchain;
9083         struct sctp_chunkhdr *chdr;
9084         struct sctp_tmit_chunk *chk;
9085
9086
9087         if (net == NULL)
9088                 /* must have a net pointer */
9089                 return;
9090
9091         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9092         if (outchain == NULL) {
9093                 /* gak out of memory */
9094                 return;
9095         }
9096 #ifdef SCTP_MBUF_LOGGING
9097         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9098                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9099         }
9100 #endif
9101         chdr = mtod(outchain, struct sctp_chunkhdr *);
9102         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9103         chdr->chunk_flags = 0;
9104         if (chk_length % 4) {
9105                 /* need pad */
9106                 uint32_t cpthis = 0;
9107                 int padlen;
9108
9109                 padlen = 4 - (chk_length % 4);
9110                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9111         }
9112         sctp_alloc_a_chunk(stcb, chk);
9113         if (chk == NULL) {
9114                 /* no memory */
9115                 sctp_m_freem(outchain);
9116                 return;
9117         }
9118         chk->copy_by_ref = 0;
9119         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9120         chk->rec.chunk_id.can_take_data = 1;
9121         chk->flags = 0;
9122         chk->send_size = chk_length;
9123         chk->sent = SCTP_DATAGRAM_UNSENT;
9124         chk->snd_count = 0;
9125         chk->asoc = &stcb->asoc;
9126         chk->data = outchain;
9127         chk->whoTo = net;
9128         atomic_add_int(&chk->whoTo->ref_count, 1);
9129         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9130         chk->asoc->ctrl_queue_cnt++;
9131 }
9132
9133 void
9134 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9135 {
9136         /* formulate and queue a cookie-ack back to sender */
9137         struct mbuf *cookie_ack;
9138         struct sctp_chunkhdr *hdr;
9139         struct sctp_tmit_chunk *chk;
9140
9141         SCTP_TCB_LOCK_ASSERT(stcb);
9142
9143         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9144         if (cookie_ack == NULL) {
9145                 /* no mbuf's */
9146                 return;
9147         }
9148         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9149         sctp_alloc_a_chunk(stcb, chk);
9150         if (chk == NULL) {
9151                 /* no memory */
9152                 sctp_m_freem(cookie_ack);
9153                 return;
9154         }
9155         chk->copy_by_ref = 0;
9156         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9157         chk->rec.chunk_id.can_take_data = 1;
9158         chk->flags = 0;
9159         chk->send_size = sizeof(struct sctp_chunkhdr);
9160         chk->sent = SCTP_DATAGRAM_UNSENT;
9161         chk->snd_count = 0;
9162         chk->asoc = &stcb->asoc;
9163         chk->data = cookie_ack;
9164         if (chk->asoc->last_control_chunk_from != NULL) {
9165                 chk->whoTo = chk->asoc->last_control_chunk_from;
9166                 atomic_add_int(&chk->whoTo->ref_count, 1);
9167         } else {
9168                 chk->whoTo = NULL;
9169         }
9170         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9171         hdr->chunk_type = SCTP_COOKIE_ACK;
9172         hdr->chunk_flags = 0;
9173         hdr->chunk_length = htons(chk->send_size);
9174         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9175         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9176         chk->asoc->ctrl_queue_cnt++;
9177         return;
9178 }
9179
9180
9181 void
9182 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9183 {
9184         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9185         struct mbuf *m_shutdown_ack;
9186         struct sctp_shutdown_ack_chunk *ack_cp;
9187         struct sctp_tmit_chunk *chk;
9188
9189         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9190         if (m_shutdown_ack == NULL) {
9191                 /* no mbuf's */
9192                 return;
9193         }
9194         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9195         sctp_alloc_a_chunk(stcb, chk);
9196         if (chk == NULL) {
9197                 /* no memory */
9198                 sctp_m_freem(m_shutdown_ack);
9199                 return;
9200         }
9201         chk->copy_by_ref = 0;
9202         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9203         chk->rec.chunk_id.can_take_data = 1;
9204         chk->flags = 0;
9205         chk->send_size = sizeof(struct sctp_chunkhdr);
9206         chk->sent = SCTP_DATAGRAM_UNSENT;
9207         chk->snd_count = 0;
9208         chk->asoc = &stcb->asoc;
9209         chk->data = m_shutdown_ack;
9210         chk->whoTo = net;
9211         if (chk->whoTo) {
9212                 atomic_add_int(&chk->whoTo->ref_count, 1);
9213         }
9214         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9215         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9216         ack_cp->ch.chunk_flags = 0;
9217         ack_cp->ch.chunk_length = htons(chk->send_size);
9218         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9219         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9220         chk->asoc->ctrl_queue_cnt++;
9221         return;
9222 }
9223
9224 void
9225 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9226 {
9227         /* formulate and queue a SHUTDOWN to the sender */
9228         struct mbuf *m_shutdown;
9229         struct sctp_shutdown_chunk *shutdown_cp;
9230         struct sctp_tmit_chunk *chk;
9231
9232         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9233                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9234                         /* We already have a SHUTDOWN queued. Reuse it. */
9235                         if (chk->whoTo) {
9236                                 sctp_free_remote_addr(chk->whoTo);
9237                                 chk->whoTo = NULL;
9238                         }
9239                         break;
9240                 }
9241         }
9242         if (chk == NULL) {
9243                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9244                 if (m_shutdown == NULL) {
9245                         /* no mbuf's */
9246                         return;
9247                 }
9248                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9249                 sctp_alloc_a_chunk(stcb, chk);
9250                 if (chk == NULL) {
9251                         /* no memory */
9252                         sctp_m_freem(m_shutdown);
9253                         return;
9254                 }
9255                 chk->copy_by_ref = 0;
9256                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9257                 chk->rec.chunk_id.can_take_data = 1;
9258                 chk->flags = 0;
9259                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9260                 chk->sent = SCTP_DATAGRAM_UNSENT;
9261                 chk->snd_count = 0;
9262                 chk->asoc = &stcb->asoc;
9263                 chk->data = m_shutdown;
9264                 chk->whoTo = net;
9265                 if (chk->whoTo) {
9266                         atomic_add_int(&chk->whoTo->ref_count, 1);
9267                 }
9268                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9269                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9270                 shutdown_cp->ch.chunk_flags = 0;
9271                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9272                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9273                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9274                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9275                 chk->asoc->ctrl_queue_cnt++;
9276         } else {
9277                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9278                 chk->whoTo = net;
9279                 if (chk->whoTo) {
9280                         atomic_add_int(&chk->whoTo->ref_count, 1);
9281                 }
9282                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9283                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9284                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9285         }
9286         return;
9287 }
9288
9289 void
9290 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9291 {
9292         /*
9293          * formulate and queue an ASCONF to the peer. ASCONF parameters
9294          * should be queued on the assoc queue.
9295          */
9296         struct sctp_tmit_chunk *chk;
9297         struct mbuf *m_asconf;
9298         int len;
9299
9300         SCTP_TCB_LOCK_ASSERT(stcb);
9301
9302         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9303             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9304                 /* can't send a new one if there is one in flight already */
9305                 return;
9306         }
9307
9308         /* compose an ASCONF chunk, maximum length is PMTU */
9309         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9310         if (m_asconf == NULL) {
9311                 return;
9312         }
9313
9314         sctp_alloc_a_chunk(stcb, chk);
9315         if (chk == NULL) {
9316                 /* no memory */
9317                 sctp_m_freem(m_asconf);
9318                 return;
9319         }
9320
9321         chk->copy_by_ref = 0;
9322         chk->rec.chunk_id.id = SCTP_ASCONF;
9323         chk->rec.chunk_id.can_take_data = 0;
9324         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9325         chk->data = m_asconf;
9326         chk->send_size = len;
9327         chk->sent = SCTP_DATAGRAM_UNSENT;
9328         chk->snd_count = 0;
9329         chk->asoc = &stcb->asoc;
9330         chk->whoTo = net;
9331         if (chk->whoTo) {
9332                 atomic_add_int(&chk->whoTo->ref_count, 1);
9333         }
9334         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9335         chk->asoc->ctrl_queue_cnt++;
9336         return;
9337 }
9338
9339 void
9340 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9341 {
9342         /*
9343          * formulate and queue a asconf-ack back to sender. the asconf-ack
9344          * must be stored in the tcb.
9345          */
9346         struct sctp_tmit_chunk *chk;
9347         struct sctp_asconf_ack *ack, *latest_ack;
9348         struct mbuf *m_ack;
9349         struct sctp_nets *net = NULL;
9350
9351         SCTP_TCB_LOCK_ASSERT(stcb);
9352         /* Get the latest ASCONF-ACK */
9353         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9354         if (latest_ack == NULL) {
9355                 return;
9356         }
9357         if (latest_ack->last_sent_to != NULL &&
9358             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9359                 /* we're doing a retransmission */
9360                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9361                 if (net == NULL) {
9362                         /* no alternate */
9363                         if (stcb->asoc.last_control_chunk_from == NULL) {
9364                                 if (stcb->asoc.alternate) {
9365                                         net = stcb->asoc.alternate;
9366                                 } else {
9367                                         net = stcb->asoc.primary_destination;
9368                                 }
9369                         } else {
9370                                 net = stcb->asoc.last_control_chunk_from;
9371                         }
9372                 }
9373         } else {
9374                 /* normal case */
9375                 if (stcb->asoc.last_control_chunk_from == NULL) {
9376                         if (stcb->asoc.alternate) {
9377                                 net = stcb->asoc.alternate;
9378                         } else {
9379                                 net = stcb->asoc.primary_destination;
9380                         }
9381                 } else {
9382                         net = stcb->asoc.last_control_chunk_from;
9383                 }
9384         }
9385         latest_ack->last_sent_to = net;
9386
9387         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9388                 if (ack->data == NULL) {
9389                         continue;
9390                 }
9391
9392                 /* copy the asconf_ack */
9393                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9394                 if (m_ack == NULL) {
9395                         /* couldn't copy it */
9396                         return;
9397                 }
9398 #ifdef SCTP_MBUF_LOGGING
9399                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9400                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9401                 }
9402 #endif
9403
9404                 sctp_alloc_a_chunk(stcb, chk);
9405                 if (chk == NULL) {
9406                         /* no memory */
9407                         if (m_ack)
9408                                 sctp_m_freem(m_ack);
9409                         return;
9410                 }
9411                 chk->copy_by_ref = 0;
9412                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9413                 chk->rec.chunk_id.can_take_data = 1;
9414                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9415                 chk->whoTo = net;
9416                 if (chk->whoTo) {
9417                         atomic_add_int(&chk->whoTo->ref_count, 1);
9418                 }
9419                 chk->data = m_ack;
9420                 chk->send_size = ack->len;
9421                 chk->sent = SCTP_DATAGRAM_UNSENT;
9422                 chk->snd_count = 0;
9423                 chk->asoc = &stcb->asoc;
9424
9425                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9426                 chk->asoc->ctrl_queue_cnt++;
9427         }
9428         return;
9429 }
9430
9431
9432 static int
9433 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9434     struct sctp_tcb *stcb,
9435     struct sctp_association *asoc,
9436     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9437 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9438     SCTP_UNUSED
9439 #endif
9440 )
9441 {
9442         /*-
9443          * send out one MTU of retransmission. If fast_retransmit is
9444          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9445          * rwnd. For a Cookie or Asconf in the control chunk queue we
9446          * retransmit them by themselves.
9447          *
9448          * For data chunks we will pick out the lowest TSN's in the sent_queue
9449          * marked for resend and bundle them all together (up to a MTU of
9450          * destination). The address to send to should have been
9451          * selected/changed where the retransmission was marked (i.e. in FR
9452          * or t3-timeout routines).
9453          */
9454         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9455         struct sctp_tmit_chunk *chk, *fwd;
9456         struct mbuf *m, *endofchain;
9457         struct sctp_nets *net = NULL;
9458         uint32_t tsns_sent = 0;
9459         int no_fragmentflg, bundle_at, cnt_thru;
9460         unsigned int mtu;
9461         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9462         struct sctp_auth_chunk *auth = NULL;
9463         uint32_t auth_offset = 0;
9464         uint16_t auth_keyid;
9465         int override_ok = 1;
9466         int data_auth_reqd = 0;
9467         uint32_t dmtu = 0;
9468
9469         SCTP_TCB_LOCK_ASSERT(stcb);
9470         tmr_started = ctl_cnt = bundle_at = error = 0;
9471         no_fragmentflg = 1;
9472         fwd_tsn = 0;
9473         *cnt_out = 0;
9474         fwd = NULL;
9475         endofchain = m = NULL;
9476         auth_keyid = stcb->asoc.authinfo.active_keyid;
9477 #ifdef SCTP_AUDITING_ENABLED
9478         sctp_audit_log(0xC3, 1);
9479 #endif
9480         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9481             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9482                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9483                     asoc->sent_queue_retran_cnt);
9484                 asoc->sent_queue_cnt = 0;
9485                 asoc->sent_queue_cnt_removeable = 0;
9486                 /* send back 0/0 so we enter normal transmission */
9487                 *cnt_out = 0;
9488                 return (0);
9489         }
9490         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9491                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9492                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9493                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9494                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9495                                 continue;
9496                         }
9497                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9498                                 if (chk != asoc->str_reset) {
9499                                         /*
9500                                          * not eligible for retran if its
9501                                          * not ours
9502                                          */
9503                                         continue;
9504                                 }
9505                         }
9506                         ctl_cnt++;
9507                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9508                                 fwd_tsn = 1;
9509                         }
9510                         /*
9511                          * Add an AUTH chunk, if chunk requires it save the
9512                          * offset into the chain for AUTH
9513                          */
9514                         if ((auth == NULL) &&
9515                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9516                             stcb->asoc.peer_auth_chunks))) {
9517                                 m = sctp_add_auth_chunk(m, &endofchain,
9518                                     &auth, &auth_offset,
9519                                     stcb,
9520                                     chk->rec.chunk_id.id);
9521                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9522                         }
9523                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9524                         break;
9525                 }
9526         }
9527         one_chunk = 0;
9528         cnt_thru = 0;
9529         /* do we have control chunks to retransmit? */
9530         if (m != NULL) {
9531                 /* Start a timer no matter if we succeed or fail */
9532                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9533                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9534                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9535                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9536                 chk->snd_count++;       /* update our count */
9537                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9538                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9539                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9540                     no_fragmentflg, 0, 0,
9541                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9542                     chk->whoTo->port, NULL,
9543                     0, 0,
9544                     so_locked))) {
9545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9546                         if (error == ENOBUFS) {
9547                                 asoc->ifp_had_enobuf = 1;
9548                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9549                         }
9550                         return (error);
9551                 } else {
9552                         asoc->ifp_had_enobuf = 0;
9553                 }
9554                 endofchain = NULL;
9555                 auth = NULL;
9556                 auth_offset = 0;
9557                 /*
9558                  * We don't want to mark the net->sent time here since this
9559                  * we use this for HB and retrans cannot measure RTT
9560                  */
9561                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9562                 *cnt_out += 1;
9563                 chk->sent = SCTP_DATAGRAM_SENT;
9564                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9565                 if (fwd_tsn == 0) {
9566                         return (0);
9567                 } else {
9568                         /* Clean up the fwd-tsn list */
9569                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9570                         return (0);
9571                 }
9572         }
9573         /*
9574          * Ok, it is just data retransmission we need to do or that and a
9575          * fwd-tsn with it all.
9576          */
9577         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9578                 return (SCTP_RETRAN_DONE);
9579         }
9580         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9581             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9582                 /* not yet open, resend the cookie and that is it */
9583                 return (1);
9584         }
9585 #ifdef SCTP_AUDITING_ENABLED
9586         sctp_auditing(20, inp, stcb, NULL);
9587 #endif
9588         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9589         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9590                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9591                         /* No, not sent to this net or not ready for rtx */
9592                         continue;
9593                 }
9594                 if (chk->data == NULL) {
9595                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9596                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9597                         continue;
9598                 }
9599                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9600                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9601                         struct mbuf *op_err;
9602                         char msg[SCTP_DIAG_INFO_LEN];
9603
9604                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9605                             chk->rec.data.tsn, chk->snd_count);
9606                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9607                             msg);
9608                         atomic_add_int(&stcb->asoc.refcnt, 1);
9609                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9610                             so_locked);
9611                         SCTP_TCB_LOCK(stcb);
9612                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9613                         return (SCTP_RETRAN_EXIT);
9614                 }
9615                 /* pick up the net */
9616                 net = chk->whoTo;
9617                 switch (net->ro._l_addr.sa.sa_family) {
9618 #ifdef INET
9619                 case AF_INET:
9620                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9621                         break;
9622 #endif
9623 #ifdef INET6
9624                 case AF_INET6:
9625                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9626                         break;
9627 #endif
9628                 default:
9629                         /* TSNH */
9630                         mtu = net->mtu;
9631                         break;
9632                 }
9633
9634                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9635                         /* No room in peers rwnd */
9636                         uint32_t tsn;
9637
9638                         tsn = asoc->last_acked_seq + 1;
9639                         if (tsn == chk->rec.data.tsn) {
9640                                 /*
9641                                  * we make a special exception for this
9642                                  * case. The peer has no rwnd but is missing
9643                                  * the lowest chunk.. which is probably what
9644                                  * is holding up the rwnd.
9645                                  */
9646                                 goto one_chunk_around;
9647                         }
9648                         return (1);
9649                 }
9650 one_chunk_around:
9651                 if (asoc->peers_rwnd < mtu) {
9652                         one_chunk = 1;
9653                         if ((asoc->peers_rwnd == 0) &&
9654                             (asoc->total_flight == 0)) {
9655                                 chk->window_probe = 1;
9656                                 chk->whoTo->window_probe = 1;
9657                         }
9658                 }
9659 #ifdef SCTP_AUDITING_ENABLED
9660                 sctp_audit_log(0xC3, 2);
9661 #endif
9662                 bundle_at = 0;
9663                 m = NULL;
9664                 net->fast_retran_ip = 0;
9665                 if (chk->rec.data.doing_fast_retransmit == 0) {
9666                         /*
9667                          * if no FR in progress skip destination that have
9668                          * flight_size > cwnd.
9669                          */
9670                         if (net->flight_size >= net->cwnd) {
9671                                 continue;
9672                         }
9673                 } else {
9674                         /*
9675                          * Mark the destination net to have FR recovery
9676                          * limits put on it.
9677                          */
9678                         *fr_done = 1;
9679                         net->fast_retran_ip = 1;
9680                 }
9681
9682                 /*
9683                  * if no AUTH is yet included and this chunk requires it,
9684                  * make sure to account for it.  We don't apply the size
9685                  * until the AUTH chunk is actually added below in case
9686                  * there is no room for this chunk.
9687                  */
9688                 if (data_auth_reqd && (auth == NULL)) {
9689                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9690                 } else
9691                         dmtu = 0;
9692
9693                 if ((chk->send_size <= (mtu - dmtu)) ||
9694                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9695                         /* ok we will add this one */
9696                         if (data_auth_reqd) {
9697                                 if (auth == NULL) {
9698                                         m = sctp_add_auth_chunk(m,
9699                                             &endofchain,
9700                                             &auth,
9701                                             &auth_offset,
9702                                             stcb,
9703                                             SCTP_DATA);
9704                                         auth_keyid = chk->auth_keyid;
9705                                         override_ok = 0;
9706                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9707                                 } else if (override_ok) {
9708                                         auth_keyid = chk->auth_keyid;
9709                                         override_ok = 0;
9710                                 } else if (chk->auth_keyid != auth_keyid) {
9711                                         /* different keyid, so done bundling */
9712                                         break;
9713                                 }
9714                         }
9715                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9716                         if (m == NULL) {
9717                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9718                                 return (ENOMEM);
9719                         }
9720                         /* Do clear IP_DF ? */
9721                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9722                                 no_fragmentflg = 0;
9723                         }
9724                         /* upate our MTU size */
9725                         if (mtu > (chk->send_size + dmtu))
9726                                 mtu -= (chk->send_size + dmtu);
9727                         else
9728                                 mtu = 0;
9729                         data_list[bundle_at++] = chk;
9730                         if (one_chunk && (asoc->total_flight <= 0)) {
9731                                 SCTP_STAT_INCR(sctps_windowprobed);
9732                         }
9733                 }
9734                 if (one_chunk == 0) {
9735                         /*
9736                          * now are there anymore forward from chk to pick
9737                          * up?
9738                          */
9739                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9740                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9741                                         /* Nope, not for retran */
9742                                         continue;
9743                                 }
9744                                 if (fwd->whoTo != net) {
9745                                         /* Nope, not the net in question */
9746                                         continue;
9747                                 }
9748                                 if (data_auth_reqd && (auth == NULL)) {
9749                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9750                                 } else
9751                                         dmtu = 0;
9752                                 if (fwd->send_size <= (mtu - dmtu)) {
9753                                         if (data_auth_reqd) {
9754                                                 if (auth == NULL) {
9755                                                         m = sctp_add_auth_chunk(m,
9756                                                             &endofchain,
9757                                                             &auth,
9758                                                             &auth_offset,
9759                                                             stcb,
9760                                                             SCTP_DATA);
9761                                                         auth_keyid = fwd->auth_keyid;
9762                                                         override_ok = 0;
9763                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9764                                                 } else if (override_ok) {
9765                                                         auth_keyid = fwd->auth_keyid;
9766                                                         override_ok = 0;
9767                                                 } else if (fwd->auth_keyid != auth_keyid) {
9768                                                         /*
9769                                                          * different keyid,
9770                                                          * so done bundling
9771                                                          */
9772                                                         break;
9773                                                 }
9774                                         }
9775                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9776                                         if (m == NULL) {
9777                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9778                                                 return (ENOMEM);
9779                                         }
9780                                         /* Do clear IP_DF ? */
9781                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9782                                                 no_fragmentflg = 0;
9783                                         }
9784                                         /* upate our MTU size */
9785                                         if (mtu > (fwd->send_size + dmtu))
9786                                                 mtu -= (fwd->send_size + dmtu);
9787                                         else
9788                                                 mtu = 0;
9789                                         data_list[bundle_at++] = fwd;
9790                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9791                                                 break;
9792                                         }
9793                                 } else {
9794                                         /* can't fit so we are done */
9795                                         break;
9796                                 }
9797                         }
9798                 }
9799                 /* Is there something to send for this destination? */
9800                 if (m) {
9801                         /*
9802                          * No matter if we fail/or succeed we should start a
9803                          * timer. A failure is like a lost IP packet :-)
9804                          */
9805                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9806                                 /*
9807                                  * no timer running on this destination
9808                                  * restart it.
9809                                  */
9810                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9811                                 tmr_started = 1;
9812                         }
9813                         /* Now lets send it, if there is anything to send :> */
9814                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9815                             (struct sockaddr *)&net->ro._l_addr, m,
9816                             auth_offset, auth, auth_keyid,
9817                             no_fragmentflg, 0, 0,
9818                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9819                             net->port, NULL,
9820                             0, 0,
9821                             so_locked))) {
9822                                 /* error, we could not output */
9823                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9824                                 if (error == ENOBUFS) {
9825                                         asoc->ifp_had_enobuf = 1;
9826                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9827                                 }
9828                                 return (error);
9829                         } else {
9830                                 asoc->ifp_had_enobuf = 0;
9831                         }
9832                         endofchain = NULL;
9833                         auth = NULL;
9834                         auth_offset = 0;
9835                         /* For HB's */
9836                         /*
9837                          * We don't want to mark the net->sent time here
9838                          * since this we use this for HB and retrans cannot
9839                          * measure RTT
9840                          */
9841                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9842
9843                         /* For auto-close */
9844                         cnt_thru++;
9845                         if (*now_filled == 0) {
9846                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9847                                 *now = asoc->time_last_sent;
9848                                 *now_filled = 1;
9849                         } else {
9850                                 asoc->time_last_sent = *now;
9851                         }
9852                         *cnt_out += bundle_at;
9853 #ifdef SCTP_AUDITING_ENABLED
9854                         sctp_audit_log(0xC4, bundle_at);
9855 #endif
9856                         if (bundle_at) {
9857                                 tsns_sent = data_list[0]->rec.data.tsn;
9858                         }
9859                         for (i = 0; i < bundle_at; i++) {
9860                                 SCTP_STAT_INCR(sctps_sendretransdata);
9861                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9862                                 /*
9863                                  * When we have a revoked data, and we
9864                                  * retransmit it, then we clear the revoked
9865                                  * flag since this flag dictates if we
9866                                  * subtracted from the fs
9867                                  */
9868                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9869                                         /* Deflate the cwnd */
9870                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9871                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9872                                 }
9873                                 data_list[i]->snd_count++;
9874                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9875                                 /* record the time */
9876                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9877                                 if (data_list[i]->book_size_scale) {
9878                                         /*
9879                                          * need to double the book size on
9880                                          * this one
9881                                          */
9882                                         data_list[i]->book_size_scale = 0;
9883                                         /*
9884                                          * Since we double the booksize, we
9885                                          * must also double the output queue
9886                                          * size, since this get shrunk when
9887                                          * we free by this amount.
9888                                          */
9889                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9890                                         data_list[i]->book_size *= 2;
9891
9892
9893                                 } else {
9894                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9895                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9896                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9897                                         }
9898                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9899                                             (uint32_t)(data_list[i]->send_size +
9900                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9901                                 }
9902                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9903                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9904                                             data_list[i]->whoTo->flight_size,
9905                                             data_list[i]->book_size,
9906                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9907                                             data_list[i]->rec.data.tsn);
9908                                 }
9909                                 sctp_flight_size_increase(data_list[i]);
9910                                 sctp_total_flight_increase(stcb, data_list[i]);
9911                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9912                                         /* SWS sender side engages */
9913                                         asoc->peers_rwnd = 0;
9914                                 }
9915                                 if ((i == 0) &&
9916                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9917                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9918                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9919                                             (tmr_started == 0)) {
9920                                                 /*-
9921                                                  * ok we just fast-retrans'd
9922                                                  * the lowest TSN, i.e the
9923                                                  * first on the list. In
9924                                                  * this case we want to give
9925                                                  * some more time to get a
9926                                                  * SACK back without a
9927                                                  * t3-expiring.
9928                                                  */
9929                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9930                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9931                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9932                                         }
9933                                 }
9934                         }
9935                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9936                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9937                         }
9938 #ifdef SCTP_AUDITING_ENABLED
9939                         sctp_auditing(21, inp, stcb, NULL);
9940 #endif
9941                 } else {
9942                         /* None will fit */
9943                         return (1);
9944                 }
9945                 if (asoc->sent_queue_retran_cnt <= 0) {
9946                         /* all done we have no more to retran */
9947                         asoc->sent_queue_retran_cnt = 0;
9948                         break;
9949                 }
9950                 if (one_chunk) {
9951                         /* No more room in rwnd */
9952                         return (1);
9953                 }
9954                 /* stop the for loop here. we sent out a packet */
9955                 break;
9956         }
9957         return (0);
9958 }
9959
9960 static void
9961 sctp_timer_validation(struct sctp_inpcb *inp,
9962     struct sctp_tcb *stcb,
9963     struct sctp_association *asoc)
9964 {
9965         struct sctp_nets *net;
9966
9967         /* Validate that a timer is running somewhere */
9968         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9969                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9970                         /* Here is a timer */
9971                         return;
9972                 }
9973         }
9974         SCTP_TCB_LOCK_ASSERT(stcb);
9975         /* Gak, we did not have a timer somewhere */
9976         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9977         if (asoc->alternate) {
9978                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9979         } else {
9980                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9981         }
9982         return;
9983 }
9984
9985 void
9986 sctp_chunk_output(struct sctp_inpcb *inp,
9987     struct sctp_tcb *stcb,
9988     int from_where,
9989     int so_locked
9990 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9991     SCTP_UNUSED
9992 #endif
9993 )
9994 {
9995         /*-
9996          * Ok this is the generic chunk service queue. we must do the
9997          * following:
9998          * - See if there are retransmits pending, if so we must
9999          *   do these first.
10000          * - Service the stream queue that is next, moving any
10001          *   message (note I must get a complete message i.e.
10002          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10003          *   TSN's
10004          * - Check to see if the cwnd/rwnd allows any output, if so we
10005          *   go ahead and fomulate and send the low level chunks. Making sure
10006          *   to combine any control in the control chunk queue also.
10007          */
10008         struct sctp_association *asoc;
10009         struct sctp_nets *net;
10010         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10011         unsigned int burst_cnt = 0;
10012         struct timeval now;
10013         int now_filled = 0;
10014         int nagle_on;
10015         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10016         int un_sent = 0;
10017         int fr_done;
10018         unsigned int tot_frs = 0;
10019
10020         asoc = &stcb->asoc;
10021 do_it_again:
10022         /* The Nagle algorithm is only applied when handling a send call. */
10023         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10024                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10025                         nagle_on = 0;
10026                 } else {
10027                         nagle_on = 1;
10028                 }
10029         } else {
10030                 nagle_on = 0;
10031         }
10032         SCTP_TCB_LOCK_ASSERT(stcb);
10033
10034         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10035
10036         if ((un_sent <= 0) &&
10037             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10038             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10039             (asoc->sent_queue_retran_cnt == 0) &&
10040             (asoc->trigger_reset == 0)) {
10041                 /* Nothing to do unless there is something to be sent left */
10042                 return;
10043         }
10044         /*
10045          * Do we have something to send, data or control AND a sack timer
10046          * running, if so piggy-back the sack.
10047          */
10048         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10049                 sctp_send_sack(stcb, so_locked);
10050                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10051         }
10052         while (asoc->sent_queue_retran_cnt) {
10053                 /*-
10054                  * Ok, it is retransmission time only, we send out only ONE
10055                  * packet with a single call off to the retran code.
10056                  */
10057                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10058                         /*-
10059                          * Special hook for handling cookiess discarded
10060                          * by peer that carried data. Send cookie-ack only
10061                          * and then the next call with get the retran's.
10062                          */
10063                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10064                             from_where,
10065                             &now, &now_filled, frag_point, so_locked);
10066                         return;
10067                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10068                         /* if its not from a HB then do it */
10069                         fr_done = 0;
10070                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10071                         if (fr_done) {
10072                                 tot_frs++;
10073                         }
10074                 } else {
10075                         /*
10076                          * its from any other place, we don't allow retran
10077                          * output (only control)
10078                          */
10079                         ret = 1;
10080                 }
10081                 if (ret > 0) {
10082                         /* Can't send anymore */
10083                         /*-
10084                          * now lets push out control by calling med-level
10085                          * output once. this assures that we WILL send HB's
10086                          * if queued too.
10087                          */
10088                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10089                             from_where,
10090                             &now, &now_filled, frag_point, so_locked);
10091 #ifdef SCTP_AUDITING_ENABLED
10092                         sctp_auditing(8, inp, stcb, NULL);
10093 #endif
10094                         sctp_timer_validation(inp, stcb, asoc);
10095                         return;
10096                 }
10097                 if (ret < 0) {
10098                         /*-
10099                          * The count was off.. retran is not happening so do
10100                          * the normal retransmission.
10101                          */
10102 #ifdef SCTP_AUDITING_ENABLED
10103                         sctp_auditing(9, inp, stcb, NULL);
10104 #endif
10105                         if (ret == SCTP_RETRAN_EXIT) {
10106                                 return;
10107                         }
10108                         break;
10109                 }
10110                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10111                         /* Only one transmission allowed out of a timeout */
10112 #ifdef SCTP_AUDITING_ENABLED
10113                         sctp_auditing(10, inp, stcb, NULL);
10114 #endif
10115                         /* Push out any control */
10116                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10117                             &now, &now_filled, frag_point, so_locked);
10118                         return;
10119                 }
10120                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10121                         /* Hit FR burst limit */
10122                         return;
10123                 }
10124                 if ((num_out == 0) && (ret == 0)) {
10125                         /* No more retrans to send */
10126                         break;
10127                 }
10128         }
10129 #ifdef SCTP_AUDITING_ENABLED
10130         sctp_auditing(12, inp, stcb, NULL);
10131 #endif
10132         /* Check for bad destinations, if they exist move chunks around. */
10133         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10134                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10135                         /*-
10136                          * if possible move things off of this address we
10137                          * still may send below due to the dormant state but
10138                          * we try to find an alternate address to send to
10139                          * and if we have one we move all queued data on the
10140                          * out wheel to this alternate address.
10141                          */
10142                         if (net->ref_count > 1)
10143                                 sctp_move_chunks_from_net(stcb, net);
10144                 } else {
10145                         /*-
10146                          * if ((asoc->sat_network) || (net->addr_is_local))
10147                          * { burst_limit = asoc->max_burst *
10148                          * SCTP_SAT_NETWORK_BURST_INCR; }
10149                          */
10150                         if (asoc->max_burst > 0) {
10151                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10152                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10153                                                 /*
10154                                                  * JRS - Use the congestion
10155                                                  * control given in the
10156                                                  * congestion control module
10157                                                  */
10158                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10159                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10160                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10161                                                 }
10162                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10163                                         }
10164                                         net->fast_retran_ip = 0;
10165                                 } else {
10166                                         if (net->flight_size == 0) {
10167                                                 /*
10168                                                  * Should be decaying the
10169                                                  * cwnd here
10170                                                  */
10171                                                 ;
10172                                         }
10173                                 }
10174                         }
10175                 }
10176
10177         }
10178         burst_cnt = 0;
10179         do {
10180                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10181                     &reason_code, 0, from_where,
10182                     &now, &now_filled, frag_point, so_locked);
10183                 if (error) {
10184                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10185                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10186                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10187                         }
10188                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10189                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10190                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10191                         }
10192                         break;
10193                 }
10194                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10195
10196                 tot_out += num_out;
10197                 burst_cnt++;
10198                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10199                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10200                         if (num_out == 0) {
10201                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10202                         }
10203                 }
10204                 if (nagle_on) {
10205                         /*
10206                          * When the Nagle algorithm is used, look at how
10207                          * much is unsent, then if its smaller than an MTU
10208                          * and we have data in flight we stop, except if we
10209                          * are handling a fragmented user message.
10210                          */
10211                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10212                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10213                             (stcb->asoc.total_flight > 0)) {
10214 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10215                                 break;
10216                         }
10217                 }
10218                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10219                     TAILQ_EMPTY(&asoc->send_queue) &&
10220                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10221                         /* Nothing left to send */
10222                         break;
10223                 }
10224                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10225                         /* Nothing left to send */
10226                         break;
10227                 }
10228         } while (num_out &&
10229             ((asoc->max_burst == 0) ||
10230             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10231             (burst_cnt < asoc->max_burst)));
10232
10233         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10234                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10235                         SCTP_STAT_INCR(sctps_maxburstqueued);
10236                         asoc->burst_limit_applied = 1;
10237                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10238                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10239                         }
10240                 } else {
10241                         asoc->burst_limit_applied = 0;
10242                 }
10243         }
10244         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10245                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10246         }
10247         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10248             tot_out);
10249
10250         /*-
10251          * Now we need to clean up the control chunk chain if a ECNE is on
10252          * it. It must be marked as UNSENT again so next call will continue
10253          * to send it until such time that we get a CWR, to remove it.
10254          */
10255         if (stcb->asoc.ecn_echo_cnt_onq)
10256                 sctp_fix_ecn_echo(asoc);
10257
10258         if (stcb->asoc.trigger_reset) {
10259                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10260                         goto do_it_again;
10261                 }
10262         }
10263         return;
10264 }
10265
10266
10267 int
10268 sctp_output(
10269     struct sctp_inpcb *inp,
10270     struct mbuf *m,
10271     struct sockaddr *addr,
10272     struct mbuf *control,
10273     struct thread *p,
10274     int flags)
10275 {
10276         if (inp == NULL) {
10277                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10278                 return (EINVAL);
10279         }
10280
10281         if (inp->sctp_socket == NULL) {
10282                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10283                 return (EINVAL);
10284         }
10285         return (sctp_sosend(inp->sctp_socket,
10286             addr,
10287             (struct uio *)NULL,
10288             m,
10289             control,
10290             flags, p
10291             ));
10292 }
10293
10294 void
10295 send_forward_tsn(struct sctp_tcb *stcb,
10296     struct sctp_association *asoc)
10297 {
10298         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10299         struct sctp_forward_tsn_chunk *fwdtsn;
10300         struct sctp_strseq *strseq;
10301         struct sctp_strseq_mid *strseq_m;
10302         uint32_t advance_peer_ack_point;
10303         unsigned int cnt_of_space, i, ovh;
10304         unsigned int space_needed;
10305         unsigned int cnt_of_skipped = 0;
10306
10307         SCTP_TCB_LOCK_ASSERT(stcb);
10308         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10309                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10310                         /* mark it to unsent */
10311                         chk->sent = SCTP_DATAGRAM_UNSENT;
10312                         chk->snd_count = 0;
10313                         /* Do we correct its output location? */
10314                         if (chk->whoTo) {
10315                                 sctp_free_remote_addr(chk->whoTo);
10316                                 chk->whoTo = NULL;
10317                         }
10318                         goto sctp_fill_in_rest;
10319                 }
10320         }
10321         /* Ok if we reach here we must build one */
10322         sctp_alloc_a_chunk(stcb, chk);
10323         if (chk == NULL) {
10324                 return;
10325         }
10326         asoc->fwd_tsn_cnt++;
10327         chk->copy_by_ref = 0;
10328         /*
10329          * We don't do the old thing here since this is used not for on-wire
10330          * but to tell if we are sending a fwd-tsn by the stack during
10331          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10332          */
10333         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10334         chk->rec.chunk_id.can_take_data = 0;
10335         chk->flags = 0;
10336         chk->asoc = asoc;
10337         chk->whoTo = NULL;
10338         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10339         if (chk->data == NULL) {
10340                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10341                 return;
10342         }
10343         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10344         chk->sent = SCTP_DATAGRAM_UNSENT;
10345         chk->snd_count = 0;
10346         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10347         asoc->ctrl_queue_cnt++;
10348 sctp_fill_in_rest:
10349         /*-
10350          * Here we go through and fill out the part that deals with
10351          * stream/seq of the ones we skip.
10352          */
10353         SCTP_BUF_LEN(chk->data) = 0;
10354         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10355                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10356                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10357                         /* no more to look at */
10358                         break;
10359                 }
10360                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10361                         /* We don't report these */
10362                         continue;
10363                 }
10364                 cnt_of_skipped++;
10365         }
10366         if (asoc->idata_supported) {
10367                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10368                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10369         } else {
10370                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10371                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10372         }
10373         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10374
10375         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10376                 ovh = SCTP_MIN_OVERHEAD;
10377         } else {
10378                 ovh = SCTP_MIN_V4_OVERHEAD;
10379         }
10380         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10381                 /* trim to a mtu size */
10382                 cnt_of_space = asoc->smallest_mtu - ovh;
10383         }
10384         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10385                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10386                     0xff, 0, cnt_of_skipped,
10387                     asoc->advanced_peer_ack_point);
10388         }
10389         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10390         if (cnt_of_space < space_needed) {
10391                 /*-
10392                  * ok we must trim down the chunk by lowering the
10393                  * advance peer ack point.
10394                  */
10395                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10396                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10397                             0xff, 0xff, cnt_of_space,
10398                             space_needed);
10399                 }
10400                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10401                 if (asoc->idata_supported) {
10402                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10403                 } else {
10404                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10405                 }
10406                 /*-
10407                  * Go through and find the TSN that will be the one
10408                  * we report.
10409                  */
10410                 at = TAILQ_FIRST(&asoc->sent_queue);
10411                 if (at != NULL) {
10412                         for (i = 0; i < cnt_of_skipped; i++) {
10413                                 tp1 = TAILQ_NEXT(at, sctp_next);
10414                                 if (tp1 == NULL) {
10415                                         break;
10416                                 }
10417                                 at = tp1;
10418                         }
10419                 }
10420                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10421                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10422                             0xff, cnt_of_skipped, at->rec.data.tsn,
10423                             asoc->advanced_peer_ack_point);
10424                 }
10425                 last = at;
10426                 /*-
10427                  * last now points to last one I can report, update
10428                  * peer ack point
10429                  */
10430                 if (last) {
10431                         advance_peer_ack_point = last->rec.data.tsn;
10432                 }
10433                 if (asoc->idata_supported) {
10434                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10435                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10436                 } else {
10437                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10438                             cnt_of_skipped * sizeof(struct sctp_strseq);
10439                 }
10440         }
10441         chk->send_size = space_needed;
10442         /* Setup the chunk */
10443         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10444         fwdtsn->ch.chunk_length = htons(chk->send_size);
10445         fwdtsn->ch.chunk_flags = 0;
10446         if (asoc->idata_supported) {
10447                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10448         } else {
10449                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10450         }
10451         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10452         SCTP_BUF_LEN(chk->data) = chk->send_size;
10453         fwdtsn++;
10454         /*-
10455          * Move pointer to after the fwdtsn and transfer to the
10456          * strseq pointer.
10457          */
10458         if (asoc->idata_supported) {
10459                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10460                 strseq = NULL;
10461         } else {
10462                 strseq = (struct sctp_strseq *)fwdtsn;
10463                 strseq_m = NULL;
10464         }
10465         /*-
10466          * Now populate the strseq list. This is done blindly
10467          * without pulling out duplicate stream info. This is
10468          * inefficent but won't harm the process since the peer will
10469          * look at these in sequence and will thus release anything.
10470          * It could mean we exceed the PMTU and chop off some that
10471          * we could have included.. but this is unlikely (aka 1432/4
10472          * would mean 300+ stream seq's would have to be reported in
10473          * one FWD-TSN. With a bit of work we can later FIX this to
10474          * optimize and pull out duplicates.. but it does add more
10475          * overhead. So for now... not!
10476          */
10477         i = 0;
10478         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10479                 if (i >= cnt_of_skipped) {
10480                         break;
10481                 }
10482                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10483                         /* We don't report these */
10484                         continue;
10485                 }
10486                 if (at->rec.data.tsn == advance_peer_ack_point) {
10487                         at->rec.data.fwd_tsn_cnt = 0;
10488                 }
10489                 if (asoc->idata_supported) {
10490                         strseq_m->sid = htons(at->rec.data.sid);
10491                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10492                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10493                         } else {
10494                                 strseq_m->flags = 0;
10495                         }
10496                         strseq_m->mid = htonl(at->rec.data.mid);
10497                         strseq_m++;
10498                 } else {
10499                         strseq->sid = htons(at->rec.data.sid);
10500                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10501                         strseq++;
10502                 }
10503                 i++;
10504         }
10505         return;
10506 }
10507
10508 void
10509 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10510 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10511     SCTP_UNUSED
10512 #endif
10513 )
10514 {
10515         /*-
10516          * Queue up a SACK or NR-SACK in the control queue.
10517          * We must first check to see if a SACK or NR-SACK is
10518          * somehow on the control queue.
10519          * If so, we will take and and remove the old one.
10520          */
10521         struct sctp_association *asoc;
10522         struct sctp_tmit_chunk *chk, *a_chk;
10523         struct sctp_sack_chunk *sack;
10524         struct sctp_nr_sack_chunk *nr_sack;
10525         struct sctp_gap_ack_block *gap_descriptor;
10526         const struct sack_track *selector;
10527         int mergeable = 0;
10528         int offset;
10529         caddr_t limit;
10530         uint32_t *dup;
10531         int limit_reached = 0;
10532         unsigned int i, siz, j;
10533         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10534         int num_dups = 0;
10535         int space_req;
10536         uint32_t highest_tsn;
10537         uint8_t flags;
10538         uint8_t type;
10539         uint8_t tsn_map;
10540
10541         if (stcb->asoc.nrsack_supported == 1) {
10542                 type = SCTP_NR_SELECTIVE_ACK;
10543         } else {
10544                 type = SCTP_SELECTIVE_ACK;
10545         }
10546         a_chk = NULL;
10547         asoc = &stcb->asoc;
10548         SCTP_TCB_LOCK_ASSERT(stcb);
10549         if (asoc->last_data_chunk_from == NULL) {
10550                 /* Hmm we never received anything */
10551                 return;
10552         }
10553         sctp_slide_mapping_arrays(stcb);
10554         sctp_set_rwnd(stcb, asoc);
10555         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10556                 if (chk->rec.chunk_id.id == type) {
10557                         /* Hmm, found a sack already on queue, remove it */
10558                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10559                         asoc->ctrl_queue_cnt--;
10560                         a_chk = chk;
10561                         if (a_chk->data) {
10562                                 sctp_m_freem(a_chk->data);
10563                                 a_chk->data = NULL;
10564                         }
10565                         if (a_chk->whoTo) {
10566                                 sctp_free_remote_addr(a_chk->whoTo);
10567                                 a_chk->whoTo = NULL;
10568                         }
10569                         break;
10570                 }
10571         }
10572         if (a_chk == NULL) {
10573                 sctp_alloc_a_chunk(stcb, a_chk);
10574                 if (a_chk == NULL) {
10575                         /* No memory so we drop the idea, and set a timer */
10576                         if (stcb->asoc.delayed_ack) {
10577                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10578                                     stcb->sctp_ep, stcb, NULL,
10579                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10580                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10581                                     stcb->sctp_ep, stcb, NULL);
10582                         } else {
10583                                 stcb->asoc.send_sack = 1;
10584                         }
10585                         return;
10586                 }
10587                 a_chk->copy_by_ref = 0;
10588                 a_chk->rec.chunk_id.id = type;
10589                 a_chk->rec.chunk_id.can_take_data = 1;
10590         }
10591         /* Clear our pkt counts */
10592         asoc->data_pkts_seen = 0;
10593
10594         a_chk->flags = 0;
10595         a_chk->asoc = asoc;
10596         a_chk->snd_count = 0;
10597         a_chk->send_size = 0;   /* fill in later */
10598         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10599         a_chk->whoTo = NULL;
10600
10601         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10602                 /*-
10603                  * Ok, the destination for the SACK is unreachable, lets see if
10604                  * we can select an alternate to asoc->last_data_chunk_from
10605                  */
10606                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10607                 if (a_chk->whoTo == NULL) {
10608                         /* Nope, no alternate */
10609                         a_chk->whoTo = asoc->last_data_chunk_from;
10610                 }
10611         } else {
10612                 a_chk->whoTo = asoc->last_data_chunk_from;
10613         }
10614         if (a_chk->whoTo) {
10615                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10616         }
10617         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10618                 highest_tsn = asoc->highest_tsn_inside_map;
10619         } else {
10620                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10621         }
10622         if (highest_tsn == asoc->cumulative_tsn) {
10623                 /* no gaps */
10624                 if (type == SCTP_SELECTIVE_ACK) {
10625                         space_req = sizeof(struct sctp_sack_chunk);
10626                 } else {
10627                         space_req = sizeof(struct sctp_nr_sack_chunk);
10628                 }
10629         } else {
10630                 /* gaps get a cluster */
10631                 space_req = MCLBYTES;
10632         }
10633         /* Ok now lets formulate a MBUF with our sack */
10634         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10635         if ((a_chk->data == NULL) ||
10636             (a_chk->whoTo == NULL)) {
10637                 /* rats, no mbuf memory */
10638                 if (a_chk->data) {
10639                         /* was a problem with the destination */
10640                         sctp_m_freem(a_chk->data);
10641                         a_chk->data = NULL;
10642                 }
10643                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10644                 /* sa_ignore NO_NULL_CHK */
10645                 if (stcb->asoc.delayed_ack) {
10646                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10647                             stcb->sctp_ep, stcb, NULL,
10648                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10649                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10650                             stcb->sctp_ep, stcb, NULL);
10651                 } else {
10652                         stcb->asoc.send_sack = 1;
10653                 }
10654                 return;
10655         }
10656         /* ok, lets go through and fill it in */
10657         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10658         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10659         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10660                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10661         }
10662         limit = mtod(a_chk->data, caddr_t);
10663         limit += space;
10664
10665         flags = 0;
10666
10667         if ((asoc->sctp_cmt_on_off > 0) &&
10668             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10669                 /*-
10670                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10671                  * received, then set high bit to 1, else 0. Reset
10672                  * pkts_rcvd.
10673                  */
10674                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10675                 asoc->cmt_dac_pkts_rcvd = 0;
10676         }
10677 #ifdef SCTP_ASOCLOG_OF_TSNS
10678         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10679         stcb->asoc.cumack_log_atsnt++;
10680         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10681                 stcb->asoc.cumack_log_atsnt = 0;
10682         }
10683 #endif
10684         /* reset the readers interpretation */
10685         stcb->freed_by_sorcv_sincelast = 0;
10686
10687         if (type == SCTP_SELECTIVE_ACK) {
10688                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10689                 nr_sack = NULL;
10690                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10691                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10692                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10693                 } else {
10694                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10695                 }
10696         } else {
10697                 sack = NULL;
10698                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10699                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10700                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10701                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10702                 } else {
10703                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10704                 }
10705         }
10706
10707         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10708                 offset = 1;
10709         } else {
10710                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10711         }
10712         if (((type == SCTP_SELECTIVE_ACK) &&
10713             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10714             ((type == SCTP_NR_SELECTIVE_ACK) &&
10715             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10716                 /* we have a gap .. maybe */
10717                 for (i = 0; i < siz; i++) {
10718                         tsn_map = asoc->mapping_array[i];
10719                         if (type == SCTP_SELECTIVE_ACK) {
10720                                 tsn_map |= asoc->nr_mapping_array[i];
10721                         }
10722                         if (i == 0) {
10723                                 /*
10724                                  * Clear all bits corresponding to TSNs
10725                                  * smaller or equal to the cumulative TSN.
10726                                  */
10727                                 tsn_map &= (~0U << (1 - offset));
10728                         }
10729                         selector = &sack_array[tsn_map];
10730                         if (mergeable && selector->right_edge) {
10731                                 /*
10732                                  * Backup, left and right edges were ok to
10733                                  * merge.
10734                                  */
10735                                 num_gap_blocks--;
10736                                 gap_descriptor--;
10737                         }
10738                         if (selector->num_entries == 0)
10739                                 mergeable = 0;
10740                         else {
10741                                 for (j = 0; j < selector->num_entries; j++) {
10742                                         if (mergeable && selector->right_edge) {
10743                                                 /*
10744                                                  * do a merge by NOT setting
10745                                                  * the left side
10746                                                  */
10747                                                 mergeable = 0;
10748                                         } else {
10749                                                 /*
10750                                                  * no merge, set the left
10751                                                  * side
10752                                                  */
10753                                                 mergeable = 0;
10754                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10755                                         }
10756                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10757                                         num_gap_blocks++;
10758                                         gap_descriptor++;
10759                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10760                                                 /* no more room */
10761                                                 limit_reached = 1;
10762                                                 break;
10763                                         }
10764                                 }
10765                                 if (selector->left_edge) {
10766                                         mergeable = 1;
10767                                 }
10768                         }
10769                         if (limit_reached) {
10770                                 /* Reached the limit stop */
10771                                 break;
10772                         }
10773                         offset += 8;
10774                 }
10775         }
10776         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10777             (limit_reached == 0)) {
10778
10779                 mergeable = 0;
10780
10781                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10782                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10783                 } else {
10784                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10785                 }
10786
10787                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10788                         offset = 1;
10789                 } else {
10790                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10791                 }
10792                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10793                         /* we have a gap .. maybe */
10794                         for (i = 0; i < siz; i++) {
10795                                 tsn_map = asoc->nr_mapping_array[i];
10796                                 if (i == 0) {
10797                                         /*
10798                                          * Clear all bits corresponding to
10799                                          * TSNs smaller or equal to the
10800                                          * cumulative TSN.
10801                                          */
10802                                         tsn_map &= (~0U << (1 - offset));
10803                                 }
10804                                 selector = &sack_array[tsn_map];
10805                                 if (mergeable && selector->right_edge) {
10806                                         /*
10807                                          * Backup, left and right edges were
10808                                          * ok to merge.
10809                                          */
10810                                         num_nr_gap_blocks--;
10811                                         gap_descriptor--;
10812                                 }
10813                                 if (selector->num_entries == 0)
10814                                         mergeable = 0;
10815                                 else {
10816                                         for (j = 0; j < selector->num_entries; j++) {
10817                                                 if (mergeable && selector->right_edge) {
10818                                                         /*
10819                                                          * do a merge by NOT
10820                                                          * setting the left
10821                                                          * side
10822                                                          */
10823                                                         mergeable = 0;
10824                                                 } else {
10825                                                         /*
10826                                                          * no merge, set the
10827                                                          * left side
10828                                                          */
10829                                                         mergeable = 0;
10830                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10831                                                 }
10832                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10833                                                 num_nr_gap_blocks++;
10834                                                 gap_descriptor++;
10835                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10836                                                         /* no more room */
10837                                                         limit_reached = 1;
10838                                                         break;
10839                                                 }
10840                                         }
10841                                         if (selector->left_edge) {
10842                                                 mergeable = 1;
10843                                         }
10844                                 }
10845                                 if (limit_reached) {
10846                                         /* Reached the limit stop */
10847                                         break;
10848                                 }
10849                                 offset += 8;
10850                         }
10851                 }
10852         }
10853         /* now we must add any dups we are going to report. */
10854         if ((limit_reached == 0) && (asoc->numduptsns)) {
10855                 dup = (uint32_t *)gap_descriptor;
10856                 for (i = 0; i < asoc->numduptsns; i++) {
10857                         *dup = htonl(asoc->dup_tsns[i]);
10858                         dup++;
10859                         num_dups++;
10860                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10861                                 /* no more room */
10862                                 break;
10863                         }
10864                 }
10865                 asoc->numduptsns = 0;
10866         }
10867         /*
10868          * now that the chunk is prepared queue it to the control chunk
10869          * queue.
10870          */
10871         if (type == SCTP_SELECTIVE_ACK) {
10872                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10873                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10874                     num_dups * sizeof(int32_t));
10875                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10876                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10877                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10878                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10879                 sack->sack.num_dup_tsns = htons(num_dups);
10880                 sack->ch.chunk_type = type;
10881                 sack->ch.chunk_flags = flags;
10882                 sack->ch.chunk_length = htons(a_chk->send_size);
10883         } else {
10884                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10885                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10886                     num_dups * sizeof(int32_t));
10887                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10888                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10889                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10890                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10891                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10892                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10893                 nr_sack->nr_sack.reserved = 0;
10894                 nr_sack->ch.chunk_type = type;
10895                 nr_sack->ch.chunk_flags = flags;
10896                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10897         }
10898         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10899         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10900         asoc->ctrl_queue_cnt++;
10901         asoc->send_sack = 0;
10902         SCTP_STAT_INCR(sctps_sendsacks);
10903         return;
10904 }
10905
10906 void
10907 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10908 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10909     SCTP_UNUSED
10910 #endif
10911 )
10912 {
10913         struct mbuf *m_abort, *m, *m_last;
10914         struct mbuf *m_out, *m_end = NULL;
10915         struct sctp_abort_chunk *abort;
10916         struct sctp_auth_chunk *auth = NULL;
10917         struct sctp_nets *net;
10918         uint32_t vtag;
10919         uint32_t auth_offset = 0;
10920         int error;
10921         uint16_t cause_len, chunk_len, padding_len;
10922
10923         SCTP_TCB_LOCK_ASSERT(stcb);
10924         /*-
10925          * Add an AUTH chunk, if chunk requires it and save the offset into
10926          * the chain for AUTH
10927          */
10928         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10929             stcb->asoc.peer_auth_chunks)) {
10930                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10931                     stcb, SCTP_ABORT_ASSOCIATION);
10932                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10933         } else {
10934                 m_out = NULL;
10935         }
10936         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10937         if (m_abort == NULL) {
10938                 if (m_out) {
10939                         sctp_m_freem(m_out);
10940                 }
10941                 if (operr) {
10942                         sctp_m_freem(operr);
10943                 }
10944                 return;
10945         }
10946         /* link in any error */
10947         SCTP_BUF_NEXT(m_abort) = operr;
10948         cause_len = 0;
10949         m_last = NULL;
10950         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10951                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10952                 if (SCTP_BUF_NEXT(m) == NULL) {
10953                         m_last = m;
10954                 }
10955         }
10956         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10957         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10958         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10959         if (m_out == NULL) {
10960                 /* NO Auth chunk prepended, so reserve space in front */
10961                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10962                 m_out = m_abort;
10963         } else {
10964                 /* Put AUTH chunk at the front of the chain */
10965                 SCTP_BUF_NEXT(m_end) = m_abort;
10966         }
10967         if (stcb->asoc.alternate) {
10968                 net = stcb->asoc.alternate;
10969         } else {
10970                 net = stcb->asoc.primary_destination;
10971         }
10972         /* Fill in the ABORT chunk header. */
10973         abort = mtod(m_abort, struct sctp_abort_chunk *);
10974         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10975         if (stcb->asoc.peer_vtag == 0) {
10976                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10977                 vtag = stcb->asoc.my_vtag;
10978                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10979         } else {
10980                 vtag = stcb->asoc.peer_vtag;
10981                 abort->ch.chunk_flags = 0;
10982         }
10983         abort->ch.chunk_length = htons(chunk_len);
10984         /* Add padding, if necessary. */
10985         if (padding_len > 0) {
10986                 if ((m_last == NULL) ||
10987                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10988                         sctp_m_freem(m_out);
10989                         return;
10990                 }
10991         }
10992         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10993             (struct sockaddr *)&net->ro._l_addr,
10994             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10995             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10996             stcb->asoc.primary_destination->port, NULL,
10997             0, 0,
10998             so_locked))) {
10999                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11000                 if (error == ENOBUFS) {
11001                         stcb->asoc.ifp_had_enobuf = 1;
11002                         SCTP_STAT_INCR(sctps_lowlevelerr);
11003                 }
11004         } else {
11005                 stcb->asoc.ifp_had_enobuf = 0;
11006         }
11007         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11008 }
11009
11010 void
11011 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11012     struct sctp_nets *net,
11013     int reflect_vtag)
11014 {
11015         /* formulate and SEND a SHUTDOWN-COMPLETE */
11016         struct mbuf *m_shutdown_comp;
11017         struct sctp_shutdown_complete_chunk *shutdown_complete;
11018         uint32_t vtag;
11019         int error;
11020         uint8_t flags;
11021
11022         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11023         if (m_shutdown_comp == NULL) {
11024                 /* no mbuf's */
11025                 return;
11026         }
11027         if (reflect_vtag) {
11028                 flags = SCTP_HAD_NO_TCB;
11029                 vtag = stcb->asoc.my_vtag;
11030         } else {
11031                 flags = 0;
11032                 vtag = stcb->asoc.peer_vtag;
11033         }
11034         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11035         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11036         shutdown_complete->ch.chunk_flags = flags;
11037         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11038         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11039         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11040             (struct sockaddr *)&net->ro._l_addr,
11041             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11042             stcb->sctp_ep->sctp_lport, stcb->rport,
11043             htonl(vtag),
11044             net->port, NULL,
11045             0, 0,
11046             SCTP_SO_NOT_LOCKED))) {
11047                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11048                 if (error == ENOBUFS) {
11049                         stcb->asoc.ifp_had_enobuf = 1;
11050                         SCTP_STAT_INCR(sctps_lowlevelerr);
11051                 }
11052         } else {
11053                 stcb->asoc.ifp_had_enobuf = 0;
11054         }
11055         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11056         return;
11057 }
11058
11059 static void
11060 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11061     struct sctphdr *sh, uint32_t vtag,
11062     uint8_t type, struct mbuf *cause,
11063     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11064     uint32_t vrf_id, uint16_t port)
11065 {
11066         struct mbuf *o_pak;
11067         struct mbuf *mout;
11068         struct sctphdr *shout;
11069         struct sctp_chunkhdr *ch;
11070 #if defined(INET) || defined(INET6)
11071         struct udphdr *udp;
11072 #endif
11073         int ret, len, cause_len, padding_len;
11074 #ifdef INET
11075         struct sockaddr_in *src_sin, *dst_sin;
11076         struct ip *ip;
11077 #endif
11078 #ifdef INET6
11079         struct sockaddr_in6 *src_sin6, *dst_sin6;
11080         struct ip6_hdr *ip6;
11081 #endif
11082
11083         /* Compute the length of the cause and add final padding. */
11084         cause_len = 0;
11085         if (cause != NULL) {
11086                 struct mbuf *m_at, *m_last = NULL;
11087
11088                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11089                         if (SCTP_BUF_NEXT(m_at) == NULL)
11090                                 m_last = m_at;
11091                         cause_len += SCTP_BUF_LEN(m_at);
11092                 }
11093                 padding_len = cause_len % 4;
11094                 if (padding_len != 0) {
11095                         padding_len = 4 - padding_len;
11096                 }
11097                 if (padding_len != 0) {
11098                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11099                                 sctp_m_freem(cause);
11100                                 return;
11101                         }
11102                 }
11103         } else {
11104                 padding_len = 0;
11105         }
11106         /* Get an mbuf for the header. */
11107         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11108         switch (dst->sa_family) {
11109 #ifdef INET
11110         case AF_INET:
11111                 len += sizeof(struct ip);
11112                 break;
11113 #endif
11114 #ifdef INET6
11115         case AF_INET6:
11116                 len += sizeof(struct ip6_hdr);
11117                 break;
11118 #endif
11119         default:
11120                 break;
11121         }
11122 #if defined(INET) || defined(INET6)
11123         if (port) {
11124                 len += sizeof(struct udphdr);
11125         }
11126 #endif
11127         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11128         if (mout == NULL) {
11129                 if (cause) {
11130                         sctp_m_freem(cause);
11131                 }
11132                 return;
11133         }
11134         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11135         SCTP_BUF_LEN(mout) = len;
11136         SCTP_BUF_NEXT(mout) = cause;
11137         M_SETFIB(mout, fibnum);
11138         mout->m_pkthdr.flowid = mflowid;
11139         M_HASHTYPE_SET(mout, mflowtype);
11140 #ifdef INET
11141         ip = NULL;
11142 #endif
11143 #ifdef INET6
11144         ip6 = NULL;
11145 #endif
11146         switch (dst->sa_family) {
11147 #ifdef INET
11148         case AF_INET:
11149                 src_sin = (struct sockaddr_in *)src;
11150                 dst_sin = (struct sockaddr_in *)dst;
11151                 ip = mtod(mout, struct ip *);
11152                 ip->ip_v = IPVERSION;
11153                 ip->ip_hl = (sizeof(struct ip) >> 2);
11154                 ip->ip_tos = 0;
11155                 ip->ip_off = htons(IP_DF);
11156                 ip_fillid(ip);
11157                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11158                 if (port) {
11159                         ip->ip_p = IPPROTO_UDP;
11160                 } else {
11161                         ip->ip_p = IPPROTO_SCTP;
11162                 }
11163                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11164                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11165                 ip->ip_sum = 0;
11166                 len = sizeof(struct ip);
11167                 shout = (struct sctphdr *)((caddr_t)ip + len);
11168                 break;
11169 #endif
11170 #ifdef INET6
11171         case AF_INET6:
11172                 src_sin6 = (struct sockaddr_in6 *)src;
11173                 dst_sin6 = (struct sockaddr_in6 *)dst;
11174                 ip6 = mtod(mout, struct ip6_hdr *);
11175                 ip6->ip6_flow = htonl(0x60000000);
11176                 if (V_ip6_auto_flowlabel) {
11177                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11178                 }
11179                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11180                 if (port) {
11181                         ip6->ip6_nxt = IPPROTO_UDP;
11182                 } else {
11183                         ip6->ip6_nxt = IPPROTO_SCTP;
11184                 }
11185                 ip6->ip6_src = dst_sin6->sin6_addr;
11186                 ip6->ip6_dst = src_sin6->sin6_addr;
11187                 len = sizeof(struct ip6_hdr);
11188                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11189                 break;
11190 #endif
11191         default:
11192                 len = 0;
11193                 shout = mtod(mout, struct sctphdr *);
11194                 break;
11195         }
11196 #if defined(INET) || defined(INET6)
11197         if (port) {
11198                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11199                         sctp_m_freem(mout);
11200                         return;
11201                 }
11202                 udp = (struct udphdr *)shout;
11203                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11204                 udp->uh_dport = port;
11205                 udp->uh_sum = 0;
11206                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11207                     sizeof(struct sctphdr) +
11208                     sizeof(struct sctp_chunkhdr) +
11209                     cause_len + padding_len));
11210                 len += sizeof(struct udphdr);
11211                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11212         } else {
11213                 udp = NULL;
11214         }
11215 #endif
11216         shout->src_port = sh->dest_port;
11217         shout->dest_port = sh->src_port;
11218         shout->checksum = 0;
11219         if (vtag) {
11220                 shout->v_tag = htonl(vtag);
11221         } else {
11222                 shout->v_tag = sh->v_tag;
11223         }
11224         len += sizeof(struct sctphdr);
11225         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11226         ch->chunk_type = type;
11227         if (vtag) {
11228                 ch->chunk_flags = 0;
11229         } else {
11230                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11231         }
11232         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11233         len += sizeof(struct sctp_chunkhdr);
11234         len += cause_len + padding_len;
11235
11236         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11237                 sctp_m_freem(mout);
11238                 return;
11239         }
11240         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11241         switch (dst->sa_family) {
11242 #ifdef INET
11243         case AF_INET:
11244                 if (port) {
11245                         if (V_udp_cksum) {
11246                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11247                         } else {
11248                                 udp->uh_sum = 0;
11249                         }
11250                 }
11251                 ip->ip_len = htons(len);
11252                 if (port) {
11253                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11254                         SCTP_STAT_INCR(sctps_sendswcrc);
11255                         if (V_udp_cksum) {
11256                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11257                         }
11258                 } else {
11259                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11260                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11261                         SCTP_STAT_INCR(sctps_sendhwcrc);
11262                 }
11263 #ifdef SCTP_PACKET_LOGGING
11264                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11265                         sctp_packet_log(o_pak);
11266                 }
11267 #endif
11268                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11269                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11270                 break;
11271 #endif
11272 #ifdef INET6
11273         case AF_INET6:
11274                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11275                 if (port) {
11276                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11277                         SCTP_STAT_INCR(sctps_sendswcrc);
11278                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11279                                 udp->uh_sum = 0xffff;
11280                         }
11281                 } else {
11282                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11283                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11284                         SCTP_STAT_INCR(sctps_sendhwcrc);
11285                 }
11286 #ifdef SCTP_PACKET_LOGGING
11287                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11288                         sctp_packet_log(o_pak);
11289                 }
11290 #endif
11291                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11292                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11293                 break;
11294 #endif
11295         default:
11296                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11297                     dst->sa_family);
11298                 sctp_m_freem(mout);
11299                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11300                 return;
11301         }
11302         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11303         if (port) {
11304                 UDPSTAT_INC(udps_opackets);
11305         }
11306         SCTP_STAT_INCR(sctps_sendpackets);
11307         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11308         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11309         if (ret) {
11310                 SCTP_STAT_INCR(sctps_senderrors);
11311         }
11312         return;
11313 }
11314
11315 void
11316 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11317     struct sctphdr *sh,
11318     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11319     uint32_t vrf_id, uint16_t port)
11320 {
11321         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11322             mflowtype, mflowid, fibnum,
11323             vrf_id, port);
11324 }
11325
11326 void
11327 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11328 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11329     SCTP_UNUSED
11330 #endif
11331 )
11332 {
11333         struct sctp_tmit_chunk *chk;
11334         struct sctp_heartbeat_chunk *hb;
11335         struct timeval now;
11336
11337         SCTP_TCB_LOCK_ASSERT(stcb);
11338         if (net == NULL) {
11339                 return;
11340         }
11341         (void)SCTP_GETTIME_TIMEVAL(&now);
11342         switch (net->ro._l_addr.sa.sa_family) {
11343 #ifdef INET
11344         case AF_INET:
11345                 break;
11346 #endif
11347 #ifdef INET6
11348         case AF_INET6:
11349                 break;
11350 #endif
11351         default:
11352                 return;
11353         }
11354         sctp_alloc_a_chunk(stcb, chk);
11355         if (chk == NULL) {
11356                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11357                 return;
11358         }
11359
11360         chk->copy_by_ref = 0;
11361         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11362         chk->rec.chunk_id.can_take_data = 1;
11363         chk->flags = 0;
11364         chk->asoc = &stcb->asoc;
11365         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11366
11367         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11368         if (chk->data == NULL) {
11369                 sctp_free_a_chunk(stcb, chk, so_locked);
11370                 return;
11371         }
11372         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11373         SCTP_BUF_LEN(chk->data) = chk->send_size;
11374         chk->sent = SCTP_DATAGRAM_UNSENT;
11375         chk->snd_count = 0;
11376         chk->whoTo = net;
11377         atomic_add_int(&chk->whoTo->ref_count, 1);
11378         /* Now we have a mbuf that we can fill in with the details */
11379         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11380         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11381         /* fill out chunk header */
11382         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11383         hb->ch.chunk_flags = 0;
11384         hb->ch.chunk_length = htons(chk->send_size);
11385         /* Fill out hb parameter */
11386         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11387         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11388         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11389         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11390         /* Did our user request this one, put it in */
11391         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11392         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11393         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11394                 /*
11395                  * we only take from the entropy pool if the address is not
11396                  * confirmed.
11397                  */
11398                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11399                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11400         } else {
11401                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11402                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11403         }
11404         switch (net->ro._l_addr.sa.sa_family) {
11405 #ifdef INET
11406         case AF_INET:
11407                 memcpy(hb->heartbeat.hb_info.address,
11408                     &net->ro._l_addr.sin.sin_addr,
11409                     sizeof(net->ro._l_addr.sin.sin_addr));
11410                 break;
11411 #endif
11412 #ifdef INET6
11413         case AF_INET6:
11414                 memcpy(hb->heartbeat.hb_info.address,
11415                     &net->ro._l_addr.sin6.sin6_addr,
11416                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11417                 break;
11418 #endif
11419         default:
11420                 if (chk->data) {
11421                         sctp_m_freem(chk->data);
11422                         chk->data = NULL;
11423                 }
11424                 sctp_free_a_chunk(stcb, chk, so_locked);
11425                 return;
11426                 break;
11427         }
11428         net->hb_responded = 0;
11429         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11430         stcb->asoc.ctrl_queue_cnt++;
11431         SCTP_STAT_INCR(sctps_sendheartbeat);
11432         return;
11433 }
11434
11435 void
11436 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11437     uint32_t high_tsn)
11438 {
11439         struct sctp_association *asoc;
11440         struct sctp_ecne_chunk *ecne;
11441         struct sctp_tmit_chunk *chk;
11442
11443         if (net == NULL) {
11444                 return;
11445         }
11446         asoc = &stcb->asoc;
11447         SCTP_TCB_LOCK_ASSERT(stcb);
11448         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11449                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11450                         /* found a previous ECN_ECHO update it if needed */
11451                         uint32_t cnt, ctsn;
11452
11453                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11454                         ctsn = ntohl(ecne->tsn);
11455                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11456                                 ecne->tsn = htonl(high_tsn);
11457                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11458                         }
11459                         cnt = ntohl(ecne->num_pkts_since_cwr);
11460                         cnt++;
11461                         ecne->num_pkts_since_cwr = htonl(cnt);
11462                         return;
11463                 }
11464         }
11465         /* nope could not find one to update so we must build one */
11466         sctp_alloc_a_chunk(stcb, chk);
11467         if (chk == NULL) {
11468                 return;
11469         }
11470         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11471         chk->copy_by_ref = 0;
11472         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11473         chk->rec.chunk_id.can_take_data = 0;
11474         chk->flags = 0;
11475         chk->asoc = &stcb->asoc;
11476         chk->send_size = sizeof(struct sctp_ecne_chunk);
11477         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11478         if (chk->data == NULL) {
11479                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11480                 return;
11481         }
11482         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11483         SCTP_BUF_LEN(chk->data) = chk->send_size;
11484         chk->sent = SCTP_DATAGRAM_UNSENT;
11485         chk->snd_count = 0;
11486         chk->whoTo = net;
11487         atomic_add_int(&chk->whoTo->ref_count, 1);
11488
11489         stcb->asoc.ecn_echo_cnt_onq++;
11490         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11491         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11492         ecne->ch.chunk_flags = 0;
11493         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11494         ecne->tsn = htonl(high_tsn);
11495         ecne->num_pkts_since_cwr = htonl(1);
11496         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11497         asoc->ctrl_queue_cnt++;
11498 }
11499
11500 void
11501 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11502     struct mbuf *m, int len, int iphlen, int bad_crc)
11503 {
11504         struct sctp_association *asoc;
11505         struct sctp_pktdrop_chunk *drp;
11506         struct sctp_tmit_chunk *chk;
11507         uint8_t *datap;
11508         int was_trunc = 0;
11509         int fullsz = 0;
11510         long spc;
11511         int offset;
11512         struct sctp_chunkhdr *ch, chunk_buf;
11513         unsigned int chk_length;
11514
11515         if (!stcb) {
11516                 return;
11517         }
11518         asoc = &stcb->asoc;
11519         SCTP_TCB_LOCK_ASSERT(stcb);
11520         if (asoc->pktdrop_supported == 0) {
11521                 /*-
11522                  * peer must declare support before I send one.
11523                  */
11524                 return;
11525         }
11526         if (stcb->sctp_socket == NULL) {
11527                 return;
11528         }
11529         sctp_alloc_a_chunk(stcb, chk);
11530         if (chk == NULL) {
11531                 return;
11532         }
11533         chk->copy_by_ref = 0;
11534         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11535         chk->rec.chunk_id.can_take_data = 1;
11536         chk->flags = 0;
11537         len -= iphlen;
11538         chk->send_size = len;
11539         /* Validate that we do not have an ABORT in here. */
11540         offset = iphlen + sizeof(struct sctphdr);
11541         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11542             sizeof(*ch), (uint8_t *)&chunk_buf);
11543         while (ch != NULL) {
11544                 chk_length = ntohs(ch->chunk_length);
11545                 if (chk_length < sizeof(*ch)) {
11546                         /* break to abort land */
11547                         break;
11548                 }
11549                 switch (ch->chunk_type) {
11550                 case SCTP_PACKET_DROPPED:
11551                 case SCTP_ABORT_ASSOCIATION:
11552                 case SCTP_INITIATION_ACK:
11553                         /**
11554                          * We don't respond with an PKT-DROP to an ABORT
11555                          * or PKT-DROP. We also do not respond to an
11556                          * INIT-ACK, because we can't know if the initiation
11557                          * tag is correct or not.
11558                          */
11559                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11560                         return;
11561                 default:
11562                         break;
11563                 }
11564                 offset += SCTP_SIZE32(chk_length);
11565                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11566                     sizeof(*ch), (uint8_t *)&chunk_buf);
11567         }
11568
11569         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11570             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11571                 /*
11572                  * only send 1 mtu worth, trim off the excess on the end.
11573                  */
11574                 fullsz = len;
11575                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11576                 was_trunc = 1;
11577         }
11578         chk->asoc = &stcb->asoc;
11579         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11580         if (chk->data == NULL) {
11581 jump_out:
11582                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11583                 return;
11584         }
11585         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11586         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11587         if (drp == NULL) {
11588                 sctp_m_freem(chk->data);
11589                 chk->data = NULL;
11590                 goto jump_out;
11591         }
11592         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11593             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11594         chk->book_size_scale = 0;
11595         if (was_trunc) {
11596                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11597                 drp->trunc_len = htons(fullsz);
11598                 /*
11599                  * Len is already adjusted to size minus overhead above take
11600                  * out the pkt_drop chunk itself from it.
11601                  */
11602                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11603                 len = chk->send_size;
11604         } else {
11605                 /* no truncation needed */
11606                 drp->ch.chunk_flags = 0;
11607                 drp->trunc_len = htons(0);
11608         }
11609         if (bad_crc) {
11610                 drp->ch.chunk_flags |= SCTP_BADCRC;
11611         }
11612         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11613         SCTP_BUF_LEN(chk->data) = chk->send_size;
11614         chk->sent = SCTP_DATAGRAM_UNSENT;
11615         chk->snd_count = 0;
11616         if (net) {
11617                 /* we should hit here */
11618                 chk->whoTo = net;
11619                 atomic_add_int(&chk->whoTo->ref_count, 1);
11620         } else {
11621                 chk->whoTo = NULL;
11622         }
11623         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11624         drp->ch.chunk_length = htons(chk->send_size);
11625         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11626         if (spc < 0) {
11627                 spc = 0;
11628         }
11629         drp->bottle_bw = htonl(spc);
11630         if (asoc->my_rwnd) {
11631                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11632                     asoc->size_on_all_streams +
11633                     asoc->my_rwnd_control_len +
11634                     stcb->sctp_socket->so_rcv.sb_cc);
11635         } else {
11636                 /*-
11637                  * If my rwnd is 0, possibly from mbuf depletion as well as
11638                  * space used, tell the peer there is NO space aka onq == bw
11639                  */
11640                 drp->current_onq = htonl(spc);
11641         }
11642         drp->reserved = 0;
11643         datap = drp->data;
11644         m_copydata(m, iphlen, len, (caddr_t)datap);
11645         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11646         asoc->ctrl_queue_cnt++;
11647 }
11648
11649 void
11650 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11651 {
11652         struct sctp_association *asoc;
11653         struct sctp_cwr_chunk *cwr;
11654         struct sctp_tmit_chunk *chk;
11655
11656         SCTP_TCB_LOCK_ASSERT(stcb);
11657         if (net == NULL) {
11658                 return;
11659         }
11660         asoc = &stcb->asoc;
11661         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11662                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11663                         /*
11664                          * found a previous CWR queued to same destination
11665                          * update it if needed
11666                          */
11667                         uint32_t ctsn;
11668
11669                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11670                         ctsn = ntohl(cwr->tsn);
11671                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11672                                 cwr->tsn = htonl(high_tsn);
11673                         }
11674                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11675                                 /* Make sure override is carried */
11676                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11677                         }
11678                         return;
11679                 }
11680         }
11681         sctp_alloc_a_chunk(stcb, chk);
11682         if (chk == NULL) {
11683                 return;
11684         }
11685         chk->copy_by_ref = 0;
11686         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11687         chk->rec.chunk_id.can_take_data = 1;
11688         chk->flags = 0;
11689         chk->asoc = &stcb->asoc;
11690         chk->send_size = sizeof(struct sctp_cwr_chunk);
11691         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11692         if (chk->data == NULL) {
11693                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11694                 return;
11695         }
11696         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11697         SCTP_BUF_LEN(chk->data) = chk->send_size;
11698         chk->sent = SCTP_DATAGRAM_UNSENT;
11699         chk->snd_count = 0;
11700         chk->whoTo = net;
11701         atomic_add_int(&chk->whoTo->ref_count, 1);
11702         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11703         cwr->ch.chunk_type = SCTP_ECN_CWR;
11704         cwr->ch.chunk_flags = override;
11705         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11706         cwr->tsn = htonl(high_tsn);
11707         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11708         asoc->ctrl_queue_cnt++;
11709 }
11710
11711 static int
11712 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11713     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11714 {
11715         uint16_t len, old_len, i;
11716         struct sctp_stream_reset_out_request *req_out;
11717         struct sctp_chunkhdr *ch;
11718         int at;
11719         int number_entries = 0;
11720
11721         ch = mtod(chk->data, struct sctp_chunkhdr *);
11722         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11723         /* get to new offset for the param. */
11724         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11725         /* now how long will this param be? */
11726         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11727                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11728                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11729                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11730                         number_entries++;
11731                 }
11732         }
11733         if (number_entries == 0) {
11734                 return (0);
11735         }
11736         if (number_entries == stcb->asoc.streamoutcnt) {
11737                 number_entries = 0;
11738         }
11739         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11740                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11741         }
11742         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11743         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11744         req_out->ph.param_length = htons(len);
11745         req_out->request_seq = htonl(seq);
11746         req_out->response_seq = htonl(resp_seq);
11747         req_out->send_reset_at_tsn = htonl(last_sent);
11748         at = 0;
11749         if (number_entries) {
11750                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11751                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11752                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11753                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11754                                 req_out->list_of_streams[at] = htons(i);
11755                                 at++;
11756                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11757                                 if (at >= number_entries) {
11758                                         break;
11759                                 }
11760                         }
11761                 }
11762         } else {
11763                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11764                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11765                 }
11766         }
11767         if (SCTP_SIZE32(len) > len) {
11768                 /*-
11769                  * Need to worry about the pad we may end up adding to the
11770                  * end. This is easy since the struct is either aligned to 4
11771                  * bytes or 2 bytes off.
11772                  */
11773                 req_out->list_of_streams[number_entries] = 0;
11774         }
11775         /* now fix the chunk length */
11776         ch->chunk_length = htons(len + old_len);
11777         chk->book_size = len + old_len;
11778         chk->book_size_scale = 0;
11779         chk->send_size = SCTP_SIZE32(chk->book_size);
11780         SCTP_BUF_LEN(chk->data) = chk->send_size;
11781         return (1);
11782 }
11783
11784 static void
11785 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11786     int number_entries, uint16_t *list,
11787     uint32_t seq)
11788 {
11789         uint16_t len, old_len, i;
11790         struct sctp_stream_reset_in_request *req_in;
11791         struct sctp_chunkhdr *ch;
11792
11793         ch = mtod(chk->data, struct sctp_chunkhdr *);
11794         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11795
11796         /* get to new offset for the param. */
11797         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11798         /* now how long will this param be? */
11799         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11800         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11801         req_in->ph.param_length = htons(len);
11802         req_in->request_seq = htonl(seq);
11803         if (number_entries) {
11804                 for (i = 0; i < number_entries; i++) {
11805                         req_in->list_of_streams[i] = htons(list[i]);
11806                 }
11807         }
11808         if (SCTP_SIZE32(len) > len) {
11809                 /*-
11810                  * Need to worry about the pad we may end up adding to the
11811                  * end. This is easy since the struct is either aligned to 4
11812                  * bytes or 2 bytes off.
11813                  */
11814                 req_in->list_of_streams[number_entries] = 0;
11815         }
11816         /* now fix the chunk length */
11817         ch->chunk_length = htons(len + old_len);
11818         chk->book_size = len + old_len;
11819         chk->book_size_scale = 0;
11820         chk->send_size = SCTP_SIZE32(chk->book_size);
11821         SCTP_BUF_LEN(chk->data) = chk->send_size;
11822         return;
11823 }
11824
11825 static void
11826 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11827     uint32_t seq)
11828 {
11829         uint16_t len, old_len;
11830         struct sctp_stream_reset_tsn_request *req_tsn;
11831         struct sctp_chunkhdr *ch;
11832
11833         ch = mtod(chk->data, struct sctp_chunkhdr *);
11834         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11835
11836         /* get to new offset for the param. */
11837         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11838         /* now how long will this param be? */
11839         len = sizeof(struct sctp_stream_reset_tsn_request);
11840         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11841         req_tsn->ph.param_length = htons(len);
11842         req_tsn->request_seq = htonl(seq);
11843
11844         /* now fix the chunk length */
11845         ch->chunk_length = htons(len + old_len);
11846         chk->send_size = len + old_len;
11847         chk->book_size = SCTP_SIZE32(chk->send_size);
11848         chk->book_size_scale = 0;
11849         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11850         return;
11851 }
11852
11853 void
11854 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11855     uint32_t resp_seq, uint32_t result)
11856 {
11857         uint16_t len, old_len;
11858         struct sctp_stream_reset_response *resp;
11859         struct sctp_chunkhdr *ch;
11860
11861         ch = mtod(chk->data, struct sctp_chunkhdr *);
11862         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11863
11864         /* get to new offset for the param. */
11865         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11866         /* now how long will this param be? */
11867         len = sizeof(struct sctp_stream_reset_response);
11868         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11869         resp->ph.param_length = htons(len);
11870         resp->response_seq = htonl(resp_seq);
11871         resp->result = ntohl(result);
11872
11873         /* now fix the chunk length */
11874         ch->chunk_length = htons(len + old_len);
11875         chk->book_size = len + old_len;
11876         chk->book_size_scale = 0;
11877         chk->send_size = SCTP_SIZE32(chk->book_size);
11878         SCTP_BUF_LEN(chk->data) = chk->send_size;
11879         return;
11880 }
11881
11882 void
11883 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11884     struct sctp_stream_reset_list *ent,
11885     int response)
11886 {
11887         struct sctp_association *asoc;
11888         struct sctp_tmit_chunk *chk;
11889         struct sctp_chunkhdr *ch;
11890
11891         asoc = &stcb->asoc;
11892
11893         /*
11894          * Reset our last reset action to the new one IP -> response
11895          * (PERFORMED probably). This assures that if we fail to send, a
11896          * retran from the peer will get the new response.
11897          */
11898         asoc->last_reset_action[0] = response;
11899         if (asoc->stream_reset_outstanding) {
11900                 return;
11901         }
11902         sctp_alloc_a_chunk(stcb, chk);
11903         if (chk == NULL) {
11904                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11905                 return;
11906         }
11907         chk->copy_by_ref = 0;
11908         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11909         chk->rec.chunk_id.can_take_data = 0;
11910         chk->flags = 0;
11911         chk->asoc = &stcb->asoc;
11912         chk->book_size = sizeof(struct sctp_chunkhdr);
11913         chk->send_size = SCTP_SIZE32(chk->book_size);
11914         chk->book_size_scale = 0;
11915         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11916         if (chk->data == NULL) {
11917                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11918                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11919                 return;
11920         }
11921         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11922         /* setup chunk parameters */
11923         chk->sent = SCTP_DATAGRAM_UNSENT;
11924         chk->snd_count = 0;
11925         if (stcb->asoc.alternate) {
11926                 chk->whoTo = stcb->asoc.alternate;
11927         } else {
11928                 chk->whoTo = stcb->asoc.primary_destination;
11929         }
11930         ch = mtod(chk->data, struct sctp_chunkhdr *);
11931         ch->chunk_type = SCTP_STREAM_RESET;
11932         ch->chunk_flags = 0;
11933         ch->chunk_length = htons(chk->book_size);
11934         atomic_add_int(&chk->whoTo->ref_count, 1);
11935         SCTP_BUF_LEN(chk->data) = chk->send_size;
11936         sctp_add_stream_reset_result(chk, ent->seq, response);
11937         /* insert the chunk for sending */
11938         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11939             chk,
11940             sctp_next);
11941         asoc->ctrl_queue_cnt++;
11942 }
11943
11944 void
11945 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11946     uint32_t resp_seq, uint32_t result,
11947     uint32_t send_una, uint32_t recv_next)
11948 {
11949         uint16_t len, old_len;
11950         struct sctp_stream_reset_response_tsn *resp;
11951         struct sctp_chunkhdr *ch;
11952
11953         ch = mtod(chk->data, struct sctp_chunkhdr *);
11954         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11955
11956         /* get to new offset for the param. */
11957         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11958         /* now how long will this param be? */
11959         len = sizeof(struct sctp_stream_reset_response_tsn);
11960         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11961         resp->ph.param_length = htons(len);
11962         resp->response_seq = htonl(resp_seq);
11963         resp->result = htonl(result);
11964         resp->senders_next_tsn = htonl(send_una);
11965         resp->receivers_next_tsn = htonl(recv_next);
11966
11967         /* now fix the chunk length */
11968         ch->chunk_length = htons(len + old_len);
11969         chk->book_size = len + old_len;
11970         chk->send_size = SCTP_SIZE32(chk->book_size);
11971         chk->book_size_scale = 0;
11972         SCTP_BUF_LEN(chk->data) = chk->send_size;
11973         return;
11974 }
11975
11976 static void
11977 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11978     uint32_t seq,
11979     uint16_t adding)
11980 {
11981         uint16_t len, old_len;
11982         struct sctp_chunkhdr *ch;
11983         struct sctp_stream_reset_add_strm *addstr;
11984
11985         ch = mtod(chk->data, struct sctp_chunkhdr *);
11986         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11987
11988         /* get to new offset for the param. */
11989         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11990         /* now how long will this param be? */
11991         len = sizeof(struct sctp_stream_reset_add_strm);
11992
11993         /* Fill it out. */
11994         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11995         addstr->ph.param_length = htons(len);
11996         addstr->request_seq = htonl(seq);
11997         addstr->number_of_streams = htons(adding);
11998         addstr->reserved = 0;
11999
12000         /* now fix the chunk length */
12001         ch->chunk_length = htons(len + old_len);
12002         chk->send_size = len + old_len;
12003         chk->book_size = SCTP_SIZE32(chk->send_size);
12004         chk->book_size_scale = 0;
12005         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12006         return;
12007 }
12008
12009 static void
12010 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12011     uint32_t seq,
12012     uint16_t adding)
12013 {
12014         uint16_t len, old_len;
12015         struct sctp_chunkhdr *ch;
12016         struct sctp_stream_reset_add_strm *addstr;
12017
12018         ch = mtod(chk->data, struct sctp_chunkhdr *);
12019         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12020
12021         /* get to new offset for the param. */
12022         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12023         /* now how long will this param be? */
12024         len = sizeof(struct sctp_stream_reset_add_strm);
12025         /* Fill it out. */
12026         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12027         addstr->ph.param_length = htons(len);
12028         addstr->request_seq = htonl(seq);
12029         addstr->number_of_streams = htons(adding);
12030         addstr->reserved = 0;
12031
12032         /* now fix the chunk length */
12033         ch->chunk_length = htons(len + old_len);
12034         chk->send_size = len + old_len;
12035         chk->book_size = SCTP_SIZE32(chk->send_size);
12036         chk->book_size_scale = 0;
12037         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12038         return;
12039 }
12040
12041 int
12042 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12043 {
12044         struct sctp_association *asoc;
12045         struct sctp_tmit_chunk *chk;
12046         struct sctp_chunkhdr *ch;
12047         uint32_t seq;
12048
12049         asoc = &stcb->asoc;
12050         asoc->trigger_reset = 0;
12051         if (asoc->stream_reset_outstanding) {
12052                 return (EALREADY);
12053         }
12054         sctp_alloc_a_chunk(stcb, chk);
12055         if (chk == NULL) {
12056                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12057                 return (ENOMEM);
12058         }
12059         chk->copy_by_ref = 0;
12060         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12061         chk->rec.chunk_id.can_take_data = 0;
12062         chk->flags = 0;
12063         chk->asoc = &stcb->asoc;
12064         chk->book_size = sizeof(struct sctp_chunkhdr);
12065         chk->send_size = SCTP_SIZE32(chk->book_size);
12066         chk->book_size_scale = 0;
12067         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12068         if (chk->data == NULL) {
12069                 sctp_free_a_chunk(stcb, chk, so_locked);
12070                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12071                 return (ENOMEM);
12072         }
12073         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12074
12075         /* setup chunk parameters */
12076         chk->sent = SCTP_DATAGRAM_UNSENT;
12077         chk->snd_count = 0;
12078         if (stcb->asoc.alternate) {
12079                 chk->whoTo = stcb->asoc.alternate;
12080         } else {
12081                 chk->whoTo = stcb->asoc.primary_destination;
12082         }
12083         ch = mtod(chk->data, struct sctp_chunkhdr *);
12084         ch->chunk_type = SCTP_STREAM_RESET;
12085         ch->chunk_flags = 0;
12086         ch->chunk_length = htons(chk->book_size);
12087         atomic_add_int(&chk->whoTo->ref_count, 1);
12088         SCTP_BUF_LEN(chk->data) = chk->send_size;
12089         seq = stcb->asoc.str_reset_seq_out;
12090         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12091                 seq++;
12092                 asoc->stream_reset_outstanding++;
12093         } else {
12094                 m_freem(chk->data);
12095                 chk->data = NULL;
12096                 sctp_free_a_chunk(stcb, chk, so_locked);
12097                 return (ENOENT);
12098         }
12099         asoc->str_reset = chk;
12100         /* insert the chunk for sending */
12101         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12102             chk,
12103             sctp_next);
12104         asoc->ctrl_queue_cnt++;
12105
12106         if (stcb->asoc.send_sack) {
12107                 sctp_send_sack(stcb, so_locked);
12108         }
12109         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12110         return (0);
12111 }
12112
12113 int
12114 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12115     uint16_t number_entries, uint16_t *list,
12116     uint8_t send_in_req,
12117     uint8_t send_tsn_req,
12118     uint8_t add_stream,
12119     uint16_t adding_o,
12120     uint16_t adding_i, uint8_t peer_asked)
12121 {
12122         struct sctp_association *asoc;
12123         struct sctp_tmit_chunk *chk;
12124         struct sctp_chunkhdr *ch;
12125         int can_send_out_req = 0;
12126         uint32_t seq;
12127
12128         asoc = &stcb->asoc;
12129         if (asoc->stream_reset_outstanding) {
12130                 /*-
12131                  * Already one pending, must get ACK back to clear the flag.
12132                  */
12133                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12134                 return (EBUSY);
12135         }
12136         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12137             (add_stream == 0)) {
12138                 /* nothing to do */
12139                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12140                 return (EINVAL);
12141         }
12142         if (send_tsn_req && send_in_req) {
12143                 /* error, can't do that */
12144                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12145                 return (EINVAL);
12146         } else if (send_in_req) {
12147                 can_send_out_req = 1;
12148         }
12149         if (number_entries > (MCLBYTES -
12150             SCTP_MIN_OVERHEAD -
12151             sizeof(struct sctp_chunkhdr) -
12152             sizeof(struct sctp_stream_reset_out_request)) /
12153             sizeof(uint16_t)) {
12154                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12155                 return (ENOMEM);
12156         }
12157         sctp_alloc_a_chunk(stcb, chk);
12158         if (chk == NULL) {
12159                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12160                 return (ENOMEM);
12161         }
12162         chk->copy_by_ref = 0;
12163         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12164         chk->rec.chunk_id.can_take_data = 0;
12165         chk->flags = 0;
12166         chk->asoc = &stcb->asoc;
12167         chk->book_size = sizeof(struct sctp_chunkhdr);
12168         chk->send_size = SCTP_SIZE32(chk->book_size);
12169         chk->book_size_scale = 0;
12170         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12171         if (chk->data == NULL) {
12172                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12173                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12174                 return (ENOMEM);
12175         }
12176         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12177
12178         /* setup chunk parameters */
12179         chk->sent = SCTP_DATAGRAM_UNSENT;
12180         chk->snd_count = 0;
12181         if (stcb->asoc.alternate) {
12182                 chk->whoTo = stcb->asoc.alternate;
12183         } else {
12184                 chk->whoTo = stcb->asoc.primary_destination;
12185         }
12186         atomic_add_int(&chk->whoTo->ref_count, 1);
12187         ch = mtod(chk->data, struct sctp_chunkhdr *);
12188         ch->chunk_type = SCTP_STREAM_RESET;
12189         ch->chunk_flags = 0;
12190         ch->chunk_length = htons(chk->book_size);
12191         SCTP_BUF_LEN(chk->data) = chk->send_size;
12192
12193         seq = stcb->asoc.str_reset_seq_out;
12194         if (can_send_out_req) {
12195                 int ret;
12196
12197                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12198                 if (ret) {
12199                         seq++;
12200                         asoc->stream_reset_outstanding++;
12201                 }
12202         }
12203         if ((add_stream & 1) &&
12204             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12205                 /* Need to allocate more */
12206                 struct sctp_stream_out *oldstream;
12207                 struct sctp_stream_queue_pending *sp, *nsp;
12208                 int i;
12209 #if defined(SCTP_DETAILED_STR_STATS)
12210                 int j;
12211 #endif
12212
12213                 oldstream = stcb->asoc.strmout;
12214                 /* get some more */
12215                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12216                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12217                     SCTP_M_STRMO);
12218                 if (stcb->asoc.strmout == NULL) {
12219                         uint8_t x;
12220
12221                         stcb->asoc.strmout = oldstream;
12222                         /* Turn off the bit */
12223                         x = add_stream & 0xfe;
12224                         add_stream = x;
12225                         goto skip_stuff;
12226                 }
12227                 /*
12228                  * Ok now we proceed with copying the old out stuff and
12229                  * initializing the new stuff.
12230                  */
12231                 SCTP_TCB_SEND_LOCK(stcb);
12232                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12233                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12234                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12235                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12236                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12237                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12238                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12239                         stcb->asoc.strmout[i].sid = i;
12240                         stcb->asoc.strmout[i].state = oldstream[i].state;
12241                         /* FIX ME FIX ME */
12242                         /*
12243                          * This should be a SS_COPY operation FIX ME STREAM
12244                          * SCHEDULER EXPERT
12245                          */
12246                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12247                         /* now anything on those queues? */
12248                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12249                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12250                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12251                         }
12252
12253                 }
12254                 /* now the new streams */
12255                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12256                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12257                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12258                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12259 #if defined(SCTP_DETAILED_STR_STATS)
12260                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12261                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12262                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12263                         }
12264 #else
12265                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12266                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12267 #endif
12268                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12269                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12270                         stcb->asoc.strmout[i].sid = i;
12271                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12272                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12273                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12274                 }
12275                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12276                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12277                 SCTP_TCB_SEND_UNLOCK(stcb);
12278         }
12279 skip_stuff:
12280         if ((add_stream & 1) && (adding_o > 0)) {
12281                 asoc->strm_pending_add_size = adding_o;
12282                 asoc->peer_req_out = peer_asked;
12283                 sctp_add_an_out_stream(chk, seq, adding_o);
12284                 seq++;
12285                 asoc->stream_reset_outstanding++;
12286         }
12287         if ((add_stream & 2) && (adding_i > 0)) {
12288                 sctp_add_an_in_stream(chk, seq, adding_i);
12289                 seq++;
12290                 asoc->stream_reset_outstanding++;
12291         }
12292         if (send_in_req) {
12293                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12294                 seq++;
12295                 asoc->stream_reset_outstanding++;
12296         }
12297         if (send_tsn_req) {
12298                 sctp_add_stream_reset_tsn(chk, seq);
12299                 asoc->stream_reset_outstanding++;
12300         }
12301         asoc->str_reset = chk;
12302         /* insert the chunk for sending */
12303         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12304             chk,
12305             sctp_next);
12306         asoc->ctrl_queue_cnt++;
12307         if (stcb->asoc.send_sack) {
12308                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12309         }
12310         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12311         return (0);
12312 }
12313
12314 void
12315 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12316     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12317     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12318     uint32_t vrf_id, uint16_t port)
12319 {
12320         /* Don't respond to an ABORT with an ABORT. */
12321         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12322                 if (cause)
12323                         sctp_m_freem(cause);
12324                 return;
12325         }
12326         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12327             mflowtype, mflowid, fibnum,
12328             vrf_id, port);
12329         return;
12330 }
12331
12332 void
12333 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12334     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12335     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12336     uint32_t vrf_id, uint16_t port)
12337 {
12338         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12339             mflowtype, mflowid, fibnum,
12340             vrf_id, port);
12341         return;
12342 }
12343
12344 static struct mbuf *
12345 sctp_copy_resume(struct uio *uio,
12346     int max_send_len,
12347     int user_marks_eor,
12348     int *error,
12349     uint32_t *sndout,
12350     struct mbuf **new_tail)
12351 {
12352         struct mbuf *m;
12353
12354         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12355             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12356         if (m == NULL) {
12357                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12358                 *error = ENOBUFS;
12359         } else {
12360                 *sndout = m_length(m, NULL);
12361                 *new_tail = m_last(m);
12362         }
12363         return (m);
12364 }
12365
12366 static int
12367 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12368     struct uio *uio,
12369     int resv_upfront)
12370 {
12371         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12372             resv_upfront, 0);
12373         if (sp->data == NULL) {
12374                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12375                 return (ENOBUFS);
12376         }
12377
12378         sp->tail_mbuf = m_last(sp->data);
12379         return (0);
12380 }
12381
12382
12383
12384 static struct sctp_stream_queue_pending *
12385 sctp_copy_it_in(struct sctp_tcb *stcb,
12386     struct sctp_association *asoc,
12387     struct sctp_sndrcvinfo *srcv,
12388     struct uio *uio,
12389     struct sctp_nets *net,
12390     ssize_t max_send_len,
12391     int user_marks_eor,
12392     int *error)
12393 {
12394
12395         /*-
12396          * This routine must be very careful in its work. Protocol
12397          * processing is up and running so care must be taken to spl...()
12398          * when you need to do something that may effect the stcb/asoc. The
12399          * sb is locked however. When data is copied the protocol processing
12400          * should be enabled since this is a slower operation...
12401          */
12402         struct sctp_stream_queue_pending *sp = NULL;
12403         int resv_in_first;
12404
12405         *error = 0;
12406         /* Now can we send this? */
12407         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12408             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12409             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12410             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12411                 /* got data while shutting down */
12412                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12413                 *error = ECONNRESET;
12414                 goto out_now;
12415         }
12416         sctp_alloc_a_strmoq(stcb, sp);
12417         if (sp == NULL) {
12418                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12419                 *error = ENOMEM;
12420                 goto out_now;
12421         }
12422         sp->act_flags = 0;
12423         sp->sender_all_done = 0;
12424         sp->sinfo_flags = srcv->sinfo_flags;
12425         sp->timetolive = srcv->sinfo_timetolive;
12426         sp->ppid = srcv->sinfo_ppid;
12427         sp->context = srcv->sinfo_context;
12428         sp->fsn = 0;
12429         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12430
12431         sp->sid = srcv->sinfo_stream;
12432         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12433         if ((sp->length == (uint32_t)uio->uio_resid) &&
12434             ((user_marks_eor == 0) ||
12435             (srcv->sinfo_flags & SCTP_EOF) ||
12436             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12437                 sp->msg_is_complete = 1;
12438         } else {
12439                 sp->msg_is_complete = 0;
12440         }
12441         sp->sender_all_done = 0;
12442         sp->some_taken = 0;
12443         sp->put_last_out = 0;
12444         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12445         sp->data = sp->tail_mbuf = NULL;
12446         if (sp->length == 0) {
12447                 goto skip_copy;
12448         }
12449         if (srcv->sinfo_keynumber_valid) {
12450                 sp->auth_keyid = srcv->sinfo_keynumber;
12451         } else {
12452                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12453         }
12454         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12455                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12456                 sp->holds_key_ref = 1;
12457         }
12458         *error = sctp_copy_one(sp, uio, resv_in_first);
12459 skip_copy:
12460         if (*error) {
12461                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12462                 sp = NULL;
12463         } else {
12464                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12465                         sp->net = net;
12466                         atomic_add_int(&sp->net->ref_count, 1);
12467                 } else {
12468                         sp->net = NULL;
12469                 }
12470                 sctp_set_prsctp_policy(sp);
12471         }
12472 out_now:
12473         return (sp);
12474 }
12475
12476
12477 int
12478 sctp_sosend(struct socket *so,
12479     struct sockaddr *addr,
12480     struct uio *uio,
12481     struct mbuf *top,
12482     struct mbuf *control,
12483     int flags,
12484     struct thread *p
12485 )
12486 {
12487         int error, use_sndinfo = 0;
12488         struct sctp_sndrcvinfo sndrcvninfo;
12489         struct sockaddr *addr_to_use;
12490 #if defined(INET) && defined(INET6)
12491         struct sockaddr_in sin;
12492 #endif
12493
12494         if (control) {
12495                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12496                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12497                     sizeof(sndrcvninfo))) {
12498                         /* got one */
12499                         use_sndinfo = 1;
12500                 }
12501         }
12502         addr_to_use = addr;
12503 #if defined(INET) && defined(INET6)
12504         if ((addr) && (addr->sa_family == AF_INET6)) {
12505                 struct sockaddr_in6 *sin6;
12506
12507                 sin6 = (struct sockaddr_in6 *)addr;
12508                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12509                         in6_sin6_2_sin(&sin, sin6);
12510                         addr_to_use = (struct sockaddr *)&sin;
12511                 }
12512         }
12513 #endif
12514         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12515             control,
12516             flags,
12517             use_sndinfo ? &sndrcvninfo : NULL
12518             ,p
12519             );
12520         return (error);
12521 }
12522
12523
12524 int
12525 sctp_lower_sosend(struct socket *so,
12526     struct sockaddr *addr,
12527     struct uio *uio,
12528     struct mbuf *i_pak,
12529     struct mbuf *control,
12530     int flags,
12531     struct sctp_sndrcvinfo *srcv
12532     ,
12533     struct thread *p
12534 )
12535 {
12536         ssize_t sndlen = 0, max_len;
12537         int error, len;
12538         struct mbuf *top = NULL;
12539         int queue_only = 0, queue_only_for_init = 0;
12540         int free_cnt_applied = 0;
12541         int un_sent;
12542         int now_filled = 0;
12543         unsigned int inqueue_bytes = 0;
12544         struct sctp_block_entry be;
12545         struct sctp_inpcb *inp;
12546         struct sctp_tcb *stcb = NULL;
12547         struct timeval now;
12548         struct sctp_nets *net;
12549         struct sctp_association *asoc;
12550         struct sctp_inpcb *t_inp;
12551         int user_marks_eor;
12552         int create_lock_applied = 0;
12553         int nagle_applies = 0;
12554         int some_on_control = 0;
12555         int got_all_of_the_send = 0;
12556         int hold_tcblock = 0;
12557         int non_blocking = 0;
12558         uint32_t local_add_more;
12559         ssize_t local_soresv = 0;
12560         uint16_t port;
12561         uint16_t sinfo_flags;
12562         sctp_assoc_t sinfo_assoc_id;
12563
12564         error = 0;
12565         net = NULL;
12566         stcb = NULL;
12567         asoc = NULL;
12568
12569         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12570         if (inp == NULL) {
12571                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12572                 error = EINVAL;
12573                 if (i_pak) {
12574                         SCTP_RELEASE_PKT(i_pak);
12575                 }
12576                 return (error);
12577         }
12578         if ((uio == NULL) && (i_pak == NULL)) {
12579                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12580                 return (EINVAL);
12581         }
12582         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12583         atomic_add_int(&inp->total_sends, 1);
12584         if (uio) {
12585                 if (uio->uio_resid < 0) {
12586                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12587                         return (EINVAL);
12588                 }
12589                 sndlen = uio->uio_resid;
12590         } else {
12591                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12592                 sndlen = SCTP_HEADER_LEN(i_pak);
12593         }
12594         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zu\n",
12595             (void *)addr,
12596             sndlen);
12597         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12598             SCTP_IS_LISTENING(inp)) {
12599                 /* The listener can NOT send */
12600                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12601                 error = ENOTCONN;
12602                 goto out_unlocked;
12603         }
12604         /**
12605          * Pre-screen address, if one is given the sin-len
12606          * must be set correctly!
12607          */
12608         if (addr) {
12609                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12610
12611                 switch (raddr->sa.sa_family) {
12612 #ifdef INET
12613                 case AF_INET:
12614                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12615                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12616                                 error = EINVAL;
12617                                 goto out_unlocked;
12618                         }
12619                         port = raddr->sin.sin_port;
12620                         break;
12621 #endif
12622 #ifdef INET6
12623                 case AF_INET6:
12624                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12625                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12626                                 error = EINVAL;
12627                                 goto out_unlocked;
12628                         }
12629                         port = raddr->sin6.sin6_port;
12630                         break;
12631 #endif
12632                 default:
12633                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12634                         error = EAFNOSUPPORT;
12635                         goto out_unlocked;
12636                 }
12637         } else
12638                 port = 0;
12639
12640         if (srcv) {
12641                 sinfo_flags = srcv->sinfo_flags;
12642                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12643                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12644                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12645                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12646                         error = EINVAL;
12647                         goto out_unlocked;
12648                 }
12649                 if (srcv->sinfo_flags)
12650                         SCTP_STAT_INCR(sctps_sends_with_flags);
12651         } else {
12652                 sinfo_flags = inp->def_send.sinfo_flags;
12653                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12654         }
12655         if (sinfo_flags & SCTP_SENDALL) {
12656                 /* its a sendall */
12657                 error = sctp_sendall(inp, uio, top, srcv);
12658                 top = NULL;
12659                 goto out_unlocked;
12660         }
12661         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12662                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12663                 error = EINVAL;
12664                 goto out_unlocked;
12665         }
12666         /* now we must find the assoc */
12667         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12668             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12669                 SCTP_INP_RLOCK(inp);
12670                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12671                 if (stcb) {
12672                         SCTP_TCB_LOCK(stcb);
12673                         hold_tcblock = 1;
12674                 }
12675                 SCTP_INP_RUNLOCK(inp);
12676         } else if (sinfo_assoc_id) {
12677                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12678                 if (stcb != NULL) {
12679                         hold_tcblock = 1;
12680                 }
12681         } else if (addr) {
12682                 /*-
12683                  * Since we did not use findep we must
12684                  * increment it, and if we don't find a tcb
12685                  * decrement it.
12686                  */
12687                 SCTP_INP_WLOCK(inp);
12688                 SCTP_INP_INCR_REF(inp);
12689                 SCTP_INP_WUNLOCK(inp);
12690                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12691                 if (stcb == NULL) {
12692                         SCTP_INP_WLOCK(inp);
12693                         SCTP_INP_DECR_REF(inp);
12694                         SCTP_INP_WUNLOCK(inp);
12695                 } else {
12696                         hold_tcblock = 1;
12697                 }
12698         }
12699         if ((stcb == NULL) && (addr)) {
12700                 /* Possible implicit send? */
12701                 SCTP_ASOC_CREATE_LOCK(inp);
12702                 create_lock_applied = 1;
12703                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12704                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12705                         /* Should I really unlock ? */
12706                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12707                         error = EINVAL;
12708                         goto out_unlocked;
12709
12710                 }
12711                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12712                     (addr->sa_family == AF_INET6)) {
12713                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12714                         error = EINVAL;
12715                         goto out_unlocked;
12716                 }
12717                 SCTP_INP_WLOCK(inp);
12718                 SCTP_INP_INCR_REF(inp);
12719                 SCTP_INP_WUNLOCK(inp);
12720                 /* With the lock applied look again */
12721                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12722 #if defined(INET) || defined(INET6)
12723                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12724                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12725                 }
12726 #endif
12727                 if (stcb == NULL) {
12728                         SCTP_INP_WLOCK(inp);
12729                         SCTP_INP_DECR_REF(inp);
12730                         SCTP_INP_WUNLOCK(inp);
12731                 } else {
12732                         hold_tcblock = 1;
12733                 }
12734                 if (error) {
12735                         goto out_unlocked;
12736                 }
12737                 if (t_inp != inp) {
12738                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12739                         error = ENOTCONN;
12740                         goto out_unlocked;
12741                 }
12742         }
12743         if (stcb == NULL) {
12744                 if (addr == NULL) {
12745                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12746                         error = ENOENT;
12747                         goto out_unlocked;
12748                 } else {
12749                         /* We must go ahead and start the INIT process */
12750                         uint32_t vrf_id;
12751
12752                         if ((sinfo_flags & SCTP_ABORT) ||
12753                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12754                                 /*-
12755                                  * User asks to abort a non-existant assoc,
12756                                  * or EOF a non-existant assoc with no data
12757                                  */
12758                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12759                                 error = ENOENT;
12760                                 goto out_unlocked;
12761                         }
12762                         /* get an asoc/stcb struct */
12763                         vrf_id = inp->def_vrf_id;
12764 #ifdef INVARIANTS
12765                         if (create_lock_applied == 0) {
12766                                 panic("Error, should hold create lock and I don't?");
12767                         }
12768 #endif
12769                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12770                             inp->sctp_ep.pre_open_stream_count,
12771                             inp->sctp_ep.port,
12772                             p);
12773                         if (stcb == NULL) {
12774                                 /* Error is setup for us in the call */
12775                                 goto out_unlocked;
12776                         }
12777                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12778                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12779                                 /*
12780                                  * Set the connected flag so we can queue
12781                                  * data
12782                                  */
12783                                 soisconnecting(so);
12784                         }
12785                         hold_tcblock = 1;
12786                         if (create_lock_applied) {
12787                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12788                                 create_lock_applied = 0;
12789                         } else {
12790                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12791                         }
12792                         /*
12793                          * Turn on queue only flag to prevent data from
12794                          * being sent
12795                          */
12796                         queue_only = 1;
12797                         asoc = &stcb->asoc;
12798                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12799                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12800
12801                         /* initialize authentication params for the assoc */
12802                         sctp_initialize_auth_params(inp, stcb);
12803
12804                         if (control) {
12805                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12806                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12807                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12808                                         hold_tcblock = 0;
12809                                         stcb = NULL;
12810                                         goto out_unlocked;
12811                                 }
12812                         }
12813                         /* out with the INIT */
12814                         queue_only_for_init = 1;
12815                         /*-
12816                          * we may want to dig in after this call and adjust the MTU
12817                          * value. It defaulted to 1500 (constant) but the ro
12818                          * structure may now have an update and thus we may need to
12819                          * change it BEFORE we append the message.
12820                          */
12821                 }
12822         } else
12823                 asoc = &stcb->asoc;
12824         if (srcv == NULL)
12825                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12826         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12827                 if (addr)
12828                         net = sctp_findnet(stcb, addr);
12829                 else
12830                         net = NULL;
12831                 if ((net == NULL) ||
12832                     ((port != 0) && (port != stcb->rport))) {
12833                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12834                         error = EINVAL;
12835                         goto out_unlocked;
12836                 }
12837         } else {
12838                 if (stcb->asoc.alternate) {
12839                         net = stcb->asoc.alternate;
12840                 } else {
12841                         net = stcb->asoc.primary_destination;
12842                 }
12843         }
12844         atomic_add_int(&stcb->total_sends, 1);
12845         /* Keep the stcb from being freed under our feet */
12846         atomic_add_int(&asoc->refcnt, 1);
12847         free_cnt_applied = 1;
12848
12849         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12850                 if (sndlen > asoc->smallest_mtu) {
12851                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12852                         error = EMSGSIZE;
12853                         goto out_unlocked;
12854                 }
12855         }
12856         if (SCTP_SO_IS_NBIO(so)
12857             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12858             ) {
12859                 non_blocking = 1;
12860         }
12861         /* would we block? */
12862         if (non_blocking) {
12863                 ssize_t amount;
12864
12865                 if (hold_tcblock == 0) {
12866                         SCTP_TCB_LOCK(stcb);
12867                         hold_tcblock = 1;
12868                 }
12869                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12870                 if (user_marks_eor == 0) {
12871                         amount = sndlen;
12872                 } else {
12873                         amount = 1;
12874                 }
12875                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12876                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12877                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12878                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12879                                 error = EMSGSIZE;
12880                         else
12881                                 error = EWOULDBLOCK;
12882                         goto out_unlocked;
12883                 }
12884                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12885                 SCTP_TCB_UNLOCK(stcb);
12886                 hold_tcblock = 0;
12887         } else {
12888                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12889         }
12890         local_soresv = sndlen;
12891         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12892                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12893                 error = ECONNRESET;
12894                 goto out_unlocked;
12895         }
12896         if (create_lock_applied) {
12897                 SCTP_ASOC_CREATE_UNLOCK(inp);
12898                 create_lock_applied = 0;
12899         }
12900         /* Is the stream no. valid? */
12901         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12902                 /* Invalid stream number */
12903                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12904                 error = EINVAL;
12905                 goto out_unlocked;
12906         }
12907         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12908             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12909                 /*
12910                  * Can't queue any data while stream reset is underway.
12911                  */
12912                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12913                         error = EAGAIN;
12914                 } else {
12915                         error = EINVAL;
12916                 }
12917                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12918                 goto out_unlocked;
12919         }
12920         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12921             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12922                 queue_only = 1;
12923         }
12924         /* we are now done with all control */
12925         if (control) {
12926                 sctp_m_freem(control);
12927                 control = NULL;
12928         }
12929         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12930             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12931             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12932             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12933                 if (srcv->sinfo_flags & SCTP_ABORT) {
12934                         ;
12935                 } else {
12936                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12937                         error = ECONNRESET;
12938                         goto out_unlocked;
12939                 }
12940         }
12941         /* Ok, we will attempt a msgsnd :> */
12942         if (p) {
12943                 p->td_ru.ru_msgsnd++;
12944         }
12945         /* Are we aborting? */
12946         if (srcv->sinfo_flags & SCTP_ABORT) {
12947                 struct mbuf *mm;
12948                 ssize_t tot_demand, tot_out = 0, max_out;
12949
12950                 SCTP_STAT_INCR(sctps_sends_with_abort);
12951                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12952                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12953                         /* It has to be up before we abort */
12954                         /* how big is the user initiated abort? */
12955                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12956                         error = EINVAL;
12957                         goto out;
12958                 }
12959                 if (hold_tcblock) {
12960                         SCTP_TCB_UNLOCK(stcb);
12961                         hold_tcblock = 0;
12962                 }
12963                 if (top) {
12964                         struct mbuf *cntm = NULL;
12965
12966                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12967                         if (sndlen != 0) {
12968                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12969                                         tot_out += SCTP_BUF_LEN(cntm);
12970                                 }
12971                         }
12972                 } else {
12973                         /* Must fit in a MTU */
12974                         tot_out = sndlen;
12975                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12976                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12977                                 /* To big */
12978                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12979                                 error = EMSGSIZE;
12980                                 goto out;
12981                         }
12982                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12983                 }
12984                 if (mm == NULL) {
12985                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12986                         error = ENOMEM;
12987                         goto out;
12988                 }
12989                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12990                 max_out -= sizeof(struct sctp_abort_msg);
12991                 if (tot_out > max_out) {
12992                         tot_out = max_out;
12993                 }
12994                 if (mm) {
12995                         struct sctp_paramhdr *ph;
12996
12997                         /* now move forward the data pointer */
12998                         ph = mtod(mm, struct sctp_paramhdr *);
12999                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13000                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
13001                         ph++;
13002                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
13003                         if (top == NULL) {
13004                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13005                                 if (error) {
13006                                         /*-
13007                                          * Here if we can't get his data we
13008                                          * still abort we just don't get to
13009                                          * send the users note :-0
13010                                          */
13011                                         sctp_m_freem(mm);
13012                                         mm = NULL;
13013                                 }
13014                         } else {
13015                                 if (sndlen != 0) {
13016                                         SCTP_BUF_NEXT(mm) = top;
13017                                 }
13018                         }
13019                 }
13020                 if (hold_tcblock == 0) {
13021                         SCTP_TCB_LOCK(stcb);
13022                 }
13023                 atomic_add_int(&stcb->asoc.refcnt, -1);
13024                 free_cnt_applied = 0;
13025                 /* release this lock, otherwise we hang on ourselves */
13026                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13027                 /* now relock the stcb so everything is sane */
13028                 hold_tcblock = 0;
13029                 stcb = NULL;
13030                 /*
13031                  * In this case top is already chained to mm avoid double
13032                  * free, since we free it below if top != NULL and driver
13033                  * would free it after sending the packet out
13034                  */
13035                 if (sndlen != 0) {
13036                         top = NULL;
13037                 }
13038                 goto out_unlocked;
13039         }
13040         /* Calculate the maximum we can send */
13041         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13042         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13043                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13044         } else {
13045                 max_len = 0;
13046         }
13047         if (hold_tcblock) {
13048                 SCTP_TCB_UNLOCK(stcb);
13049                 hold_tcblock = 0;
13050         }
13051         if (asoc->strmout == NULL) {
13052                 /* huh? software error */
13053                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13054                 error = EFAULT;
13055                 goto out_unlocked;
13056         }
13057
13058         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13059         if ((user_marks_eor == 0) &&
13060             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13061                 /* It will NEVER fit */
13062                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13063                 error = EMSGSIZE;
13064                 goto out_unlocked;
13065         }
13066         if ((uio == NULL) && user_marks_eor) {
13067                 /*-
13068                  * We do not support eeor mode for
13069                  * sending with mbuf chains (like sendfile).
13070                  */
13071                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13072                 error = EINVAL;
13073                 goto out_unlocked;
13074         }
13075
13076         if (user_marks_eor) {
13077                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13078         } else {
13079                 /*-
13080                  * For non-eeor the whole message must fit in
13081                  * the socket send buffer.
13082                  */
13083                 local_add_more = (uint32_t)sndlen;
13084         }
13085         len = 0;
13086         if (non_blocking) {
13087                 goto skip_preblock;
13088         }
13089         if (((max_len <= local_add_more) &&
13090             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13091             (max_len == 0) ||
13092             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13093                 /* No room right now ! */
13094                 SOCKBUF_LOCK(&so->so_snd);
13095                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13096                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13097                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13098                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13099                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13100                             inqueue_bytes,
13101                             local_add_more,
13102                             stcb->asoc.stream_queue_cnt,
13103                             stcb->asoc.chunks_on_out_queue,
13104                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13105                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13106                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13107                         }
13108                         be.error = 0;
13109                         stcb->block_entry = &be;
13110                         error = sbwait(&so->so_snd);
13111                         stcb->block_entry = NULL;
13112                         if (error || so->so_error || be.error) {
13113                                 if (error == 0) {
13114                                         if (so->so_error)
13115                                                 error = so->so_error;
13116                                         if (be.error) {
13117                                                 error = be.error;
13118                                         }
13119                                 }
13120                                 SOCKBUF_UNLOCK(&so->so_snd);
13121                                 goto out_unlocked;
13122                         }
13123                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13124                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13125                                     asoc, stcb->asoc.total_output_queue_size);
13126                         }
13127                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13128                                 SOCKBUF_UNLOCK(&so->so_snd);
13129                                 goto out_unlocked;
13130                         }
13131                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13132                 }
13133                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13134                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13135                 } else {
13136                         max_len = 0;
13137                 }
13138                 SOCKBUF_UNLOCK(&so->so_snd);
13139         }
13140
13141 skip_preblock:
13142         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13143                 goto out_unlocked;
13144         }
13145         /*
13146          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13147          * case NOTE: uio will be null when top/mbuf is passed
13148          */
13149         if (sndlen == 0) {
13150                 if (srcv->sinfo_flags & SCTP_EOF) {
13151                         got_all_of_the_send = 1;
13152                         goto dataless_eof;
13153                 } else {
13154                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13155                         error = EINVAL;
13156                         goto out;
13157                 }
13158         }
13159         if (top == NULL) {
13160                 struct sctp_stream_queue_pending *sp;
13161                 struct sctp_stream_out *strm;
13162                 uint32_t sndout;
13163
13164                 SCTP_TCB_SEND_LOCK(stcb);
13165                 if ((asoc->stream_locked) &&
13166                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13167                         SCTP_TCB_SEND_UNLOCK(stcb);
13168                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13169                         error = EINVAL;
13170                         goto out;
13171                 }
13172                 SCTP_TCB_SEND_UNLOCK(stcb);
13173
13174                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13175                 if (strm->last_msg_incomplete == 0) {
13176         do_a_copy_in:
13177                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13178                         if (error) {
13179                                 goto out;
13180                         }
13181                         SCTP_TCB_SEND_LOCK(stcb);
13182                         if (sp->msg_is_complete) {
13183                                 strm->last_msg_incomplete = 0;
13184                                 asoc->stream_locked = 0;
13185                         } else {
13186                                 /*
13187                                  * Just got locked to this guy in case of an
13188                                  * interrupt.
13189                                  */
13190                                 strm->last_msg_incomplete = 1;
13191                                 if (stcb->asoc.idata_supported == 0) {
13192                                         asoc->stream_locked = 1;
13193                                         asoc->stream_locked_on = srcv->sinfo_stream;
13194                                 }
13195                                 sp->sender_all_done = 0;
13196                         }
13197                         sctp_snd_sb_alloc(stcb, sp->length);
13198                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13199                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13200                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13201                         }
13202                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13203                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13204                         SCTP_TCB_SEND_UNLOCK(stcb);
13205                 } else {
13206                         SCTP_TCB_SEND_LOCK(stcb);
13207                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13208                         SCTP_TCB_SEND_UNLOCK(stcb);
13209                         if (sp == NULL) {
13210                                 /* ???? Huh ??? last msg is gone */
13211 #ifdef INVARIANTS
13212                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13213 #else
13214                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13215                                 strm->last_msg_incomplete = 0;
13216 #endif
13217                                 goto do_a_copy_in;
13218
13219                         }
13220                 }
13221                 while (uio->uio_resid > 0) {
13222                         /* How much room do we have? */
13223                         struct mbuf *new_tail, *mm;
13224
13225                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13226                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13227                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13228                         else
13229                                 max_len = 0;
13230
13231                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13232                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13233                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13234                                 sndout = 0;
13235                                 new_tail = NULL;
13236                                 if (hold_tcblock) {
13237                                         SCTP_TCB_UNLOCK(stcb);
13238                                         hold_tcblock = 0;
13239                                 }
13240                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13241                                 if ((mm == NULL) || error) {
13242                                         if (mm) {
13243                                                 sctp_m_freem(mm);
13244                                         }
13245                                         goto out;
13246                                 }
13247                                 /* Update the mbuf and count */
13248                                 SCTP_TCB_SEND_LOCK(stcb);
13249                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13250                                         /*
13251                                          * we need to get out. Peer probably
13252                                          * aborted.
13253                                          */
13254                                         sctp_m_freem(mm);
13255                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13256                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13257                                                 error = ECONNRESET;
13258                                         }
13259                                         SCTP_TCB_SEND_UNLOCK(stcb);
13260                                         goto out;
13261                                 }
13262                                 if (sp->tail_mbuf) {
13263                                         /* tack it to the end */
13264                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13265                                         sp->tail_mbuf = new_tail;
13266                                 } else {
13267                                         /* A stolen mbuf */
13268                                         sp->data = mm;
13269                                         sp->tail_mbuf = new_tail;
13270                                 }
13271                                 sctp_snd_sb_alloc(stcb, sndout);
13272                                 atomic_add_int(&sp->length, sndout);
13273                                 len += sndout;
13274                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13275                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13276                                 }
13277
13278                                 /* Did we reach EOR? */
13279                                 if ((uio->uio_resid == 0) &&
13280                                     ((user_marks_eor == 0) ||
13281                                     (srcv->sinfo_flags & SCTP_EOF) ||
13282                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13283                                         sp->msg_is_complete = 1;
13284                                 } else {
13285                                         sp->msg_is_complete = 0;
13286                                 }
13287                                 SCTP_TCB_SEND_UNLOCK(stcb);
13288                         }
13289                         if (uio->uio_resid == 0) {
13290                                 /* got it all? */
13291                                 continue;
13292                         }
13293                         /* PR-SCTP? */
13294                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13295                                 /*
13296                                  * This is ugly but we must assure locking
13297                                  * order
13298                                  */
13299                                 if (hold_tcblock == 0) {
13300                                         SCTP_TCB_LOCK(stcb);
13301                                         hold_tcblock = 1;
13302                                 }
13303                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13304                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13305                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13306                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13307                                 else
13308                                         max_len = 0;
13309                                 if (max_len > 0) {
13310                                         continue;
13311                                 }
13312                                 SCTP_TCB_UNLOCK(stcb);
13313                                 hold_tcblock = 0;
13314                         }
13315                         /* wait for space now */
13316                         if (non_blocking) {
13317                                 /* Non-blocking io in place out */
13318                                 goto skip_out_eof;
13319                         }
13320                         /* What about the INIT, send it maybe */
13321                         if (queue_only_for_init) {
13322                                 if (hold_tcblock == 0) {
13323                                         SCTP_TCB_LOCK(stcb);
13324                                         hold_tcblock = 1;
13325                                 }
13326                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13327                                         /* a collision took us forward? */
13328                                         queue_only = 0;
13329                                 } else {
13330                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13331                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13332                                         queue_only = 1;
13333                                 }
13334                         }
13335                         if ((net->flight_size > net->cwnd) &&
13336                             (asoc->sctp_cmt_on_off == 0)) {
13337                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13338                                 queue_only = 1;
13339                         } else if (asoc->ifp_had_enobuf) {
13340                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13341                                 if (net->flight_size > (2 * net->mtu)) {
13342                                         queue_only = 1;
13343                                 }
13344                                 asoc->ifp_had_enobuf = 0;
13345                         }
13346                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13347                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13348                             (stcb->asoc.total_flight > 0) &&
13349                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13350                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13351
13352                                 /*-
13353                                  * Ok, Nagle is set on and we have data outstanding.
13354                                  * Don't send anything and let SACKs drive out the
13355                                  * data unless we have a "full" segment to send.
13356                                  */
13357                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13358                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13359                                 }
13360                                 SCTP_STAT_INCR(sctps_naglequeued);
13361                                 nagle_applies = 1;
13362                         } else {
13363                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13364                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13365                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13366                                 }
13367                                 SCTP_STAT_INCR(sctps_naglesent);
13368                                 nagle_applies = 0;
13369                         }
13370                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13371
13372                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13373                                     nagle_applies, un_sent);
13374                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13375                                     stcb->asoc.total_flight,
13376                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13377                         }
13378                         if (queue_only_for_init)
13379                                 queue_only_for_init = 0;
13380                         if ((queue_only == 0) && (nagle_applies == 0)) {
13381                                 /*-
13382                                  * need to start chunk output
13383                                  * before blocking.. note that if
13384                                  * a lock is already applied, then
13385                                  * the input via the net is happening
13386                                  * and I don't need to start output :-D
13387                                  */
13388                                 if (hold_tcblock == 0) {
13389                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13390                                                 hold_tcblock = 1;
13391                                                 sctp_chunk_output(inp,
13392                                                     stcb,
13393                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13394                                         }
13395                                 } else {
13396                                         sctp_chunk_output(inp,
13397                                             stcb,
13398                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13399                                 }
13400                                 if (hold_tcblock == 1) {
13401                                         SCTP_TCB_UNLOCK(stcb);
13402                                         hold_tcblock = 0;
13403                                 }
13404                         }
13405                         SOCKBUF_LOCK(&so->so_snd);
13406                         /*-
13407                          * This is a bit strange, but I think it will
13408                          * work. The total_output_queue_size is locked and
13409                          * protected by the TCB_LOCK, which we just released.
13410                          * There is a race that can occur between releasing it
13411                          * above, and me getting the socket lock, where sacks
13412                          * come in but we have not put the SB_WAIT on the
13413                          * so_snd buffer to get the wakeup. After the LOCK
13414                          * is applied the sack_processing will also need to
13415                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13416                          * once we have the socket buffer lock if we recheck the
13417                          * size we KNOW we will get to sleep safely with the
13418                          * wakeup flag in place.
13419                          */
13420                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13421                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13422                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13423                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13424                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13425                                             asoc, uio->uio_resid);
13426                                 }
13427                                 be.error = 0;
13428                                 stcb->block_entry = &be;
13429                                 error = sbwait(&so->so_snd);
13430                                 stcb->block_entry = NULL;
13431
13432                                 if (error || so->so_error || be.error) {
13433                                         if (error == 0) {
13434                                                 if (so->so_error)
13435                                                         error = so->so_error;
13436                                                 if (be.error) {
13437                                                         error = be.error;
13438                                                 }
13439                                         }
13440                                         SOCKBUF_UNLOCK(&so->so_snd);
13441                                         goto out_unlocked;
13442                                 }
13443
13444                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13445                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13446                                             asoc, stcb->asoc.total_output_queue_size);
13447                                 }
13448                         }
13449                         SOCKBUF_UNLOCK(&so->so_snd);
13450                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13451                                 goto out_unlocked;
13452                         }
13453                 }
13454                 SCTP_TCB_SEND_LOCK(stcb);
13455                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13456                         SCTP_TCB_SEND_UNLOCK(stcb);
13457                         goto out_unlocked;
13458                 }
13459                 if (sp) {
13460                         if (sp->msg_is_complete == 0) {
13461                                 strm->last_msg_incomplete = 1;
13462                                 if (stcb->asoc.idata_supported == 0) {
13463                                         asoc->stream_locked = 1;
13464                                         asoc->stream_locked_on = srcv->sinfo_stream;
13465                                 }
13466                         } else {
13467                                 sp->sender_all_done = 1;
13468                                 strm->last_msg_incomplete = 0;
13469                                 asoc->stream_locked = 0;
13470                         }
13471                 } else {
13472                         SCTP_PRINTF("Huh no sp TSNH?\n");
13473                         strm->last_msg_incomplete = 0;
13474                         asoc->stream_locked = 0;
13475                 }
13476                 SCTP_TCB_SEND_UNLOCK(stcb);
13477                 if (uio->uio_resid == 0) {
13478                         got_all_of_the_send = 1;
13479                 }
13480         } else {
13481                 /* We send in a 0, since we do NOT have any locks */
13482                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13483                 top = NULL;
13484                 if (srcv->sinfo_flags & SCTP_EOF) {
13485                         /*
13486                          * This should only happen for Panda for the mbuf
13487                          * send case, which does NOT yet support EEOR mode.
13488                          * Thus, we can just set this flag to do the proper
13489                          * EOF handling.
13490                          */
13491                         got_all_of_the_send = 1;
13492                 }
13493         }
13494         if (error) {
13495                 goto out;
13496         }
13497 dataless_eof:
13498         /* EOF thing ? */
13499         if ((srcv->sinfo_flags & SCTP_EOF) &&
13500             (got_all_of_the_send == 1)) {
13501                 SCTP_STAT_INCR(sctps_sends_with_eof);
13502                 error = 0;
13503                 if (hold_tcblock == 0) {
13504                         SCTP_TCB_LOCK(stcb);
13505                         hold_tcblock = 1;
13506                 }
13507                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13508                     TAILQ_EMPTY(&asoc->sent_queue) &&
13509                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13510                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13511                                 goto abort_anyway;
13512                         }
13513                         /* there is nothing queued to send, so I'm done... */
13514                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13515                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13516                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13517                                 struct sctp_nets *netp;
13518
13519                                 /* only send SHUTDOWN the first time through */
13520                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13521                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13522                                 }
13523                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13524                                 sctp_stop_timers_for_shutdown(stcb);
13525                                 if (stcb->asoc.alternate) {
13526                                         netp = stcb->asoc.alternate;
13527                                 } else {
13528                                         netp = stcb->asoc.primary_destination;
13529                                 }
13530                                 sctp_send_shutdown(stcb, netp);
13531                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13532                                     netp);
13533                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13534                                     asoc->primary_destination);
13535                         }
13536                 } else {
13537                         /*-
13538                          * we still got (or just got) data to send, so set
13539                          * SHUTDOWN_PENDING
13540                          */
13541                         /*-
13542                          * XXX sockets draft says that SCTP_EOF should be
13543                          * sent with no data.  currently, we will allow user
13544                          * data to be sent first and move to
13545                          * SHUTDOWN-PENDING
13546                          */
13547                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13548                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13549                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13550                                 if (hold_tcblock == 0) {
13551                                         SCTP_TCB_LOCK(stcb);
13552                                         hold_tcblock = 1;
13553                                 }
13554                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13555                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13556                                 }
13557                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13558                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13559                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13560                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13561                                         struct mbuf *op_err;
13562                                         char msg[SCTP_DIAG_INFO_LEN];
13563
13564                         abort_anyway:
13565                                         if (free_cnt_applied) {
13566                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13567                                                 free_cnt_applied = 0;
13568                                         }
13569                                         snprintf(msg, sizeof(msg),
13570                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13571                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13572                                             msg);
13573                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13574                                             op_err, SCTP_SO_LOCKED);
13575                                         /*
13576                                          * now relock the stcb so everything
13577                                          * is sane
13578                                          */
13579                                         hold_tcblock = 0;
13580                                         stcb = NULL;
13581                                         goto out;
13582                                 }
13583                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13584                                     asoc->primary_destination);
13585                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13586                         }
13587                 }
13588         }
13589 skip_out_eof:
13590         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13591                 some_on_control = 1;
13592         }
13593         if (queue_only_for_init) {
13594                 if (hold_tcblock == 0) {
13595                         SCTP_TCB_LOCK(stcb);
13596                         hold_tcblock = 1;
13597                 }
13598                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13599                         /* a collision took us forward? */
13600                         queue_only = 0;
13601                 } else {
13602                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13603                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13604                         queue_only = 1;
13605                 }
13606         }
13607         if ((net->flight_size > net->cwnd) &&
13608             (stcb->asoc.sctp_cmt_on_off == 0)) {
13609                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13610                 queue_only = 1;
13611         } else if (asoc->ifp_had_enobuf) {
13612                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13613                 if (net->flight_size > (2 * net->mtu)) {
13614                         queue_only = 1;
13615                 }
13616                 asoc->ifp_had_enobuf = 0;
13617         }
13618         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13619         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13620             (stcb->asoc.total_flight > 0) &&
13621             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13622             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13623                 /*-
13624                  * Ok, Nagle is set on and we have data outstanding.
13625                  * Don't send anything and let SACKs drive out the
13626                  * data unless wen have a "full" segment to send.
13627                  */
13628                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13629                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13630                 }
13631                 SCTP_STAT_INCR(sctps_naglequeued);
13632                 nagle_applies = 1;
13633         } else {
13634                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13635                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13636                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13637                 }
13638                 SCTP_STAT_INCR(sctps_naglesent);
13639                 nagle_applies = 0;
13640         }
13641         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13642                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13643                     nagle_applies, un_sent);
13644                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13645                     stcb->asoc.total_flight,
13646                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13647         }
13648         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13649                 /* we can attempt to send too. */
13650                 if (hold_tcblock == 0) {
13651                         /*
13652                          * If there is activity recv'ing sacks no need to
13653                          * send
13654                          */
13655                         if (SCTP_TCB_TRYLOCK(stcb)) {
13656                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13657                                 hold_tcblock = 1;
13658                         }
13659                 } else {
13660                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13661                 }
13662         } else if ((queue_only == 0) &&
13663                     (stcb->asoc.peers_rwnd == 0) &&
13664             (stcb->asoc.total_flight == 0)) {
13665                 /* We get to have a probe outstanding */
13666                 if (hold_tcblock == 0) {
13667                         hold_tcblock = 1;
13668                         SCTP_TCB_LOCK(stcb);
13669                 }
13670                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13671         } else if (some_on_control) {
13672                 int num_out, reason, frag_point;
13673
13674                 /* Here we do control only */
13675                 if (hold_tcblock == 0) {
13676                         hold_tcblock = 1;
13677                         SCTP_TCB_LOCK(stcb);
13678                 }
13679                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13680                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13681                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13682         }
13683         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13684             queue_only, stcb->asoc.peers_rwnd, un_sent,
13685             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13686             stcb->asoc.total_output_queue_size, error);
13687
13688 out:
13689 out_unlocked:
13690
13691         if (local_soresv && stcb) {
13692                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13693         }
13694         if (create_lock_applied) {
13695                 SCTP_ASOC_CREATE_UNLOCK(inp);
13696         }
13697         if ((stcb) && hold_tcblock) {
13698                 SCTP_TCB_UNLOCK(stcb);
13699         }
13700         if (stcb && free_cnt_applied) {
13701                 atomic_add_int(&stcb->asoc.refcnt, -1);
13702         }
13703 #ifdef INVARIANTS
13704         if (stcb) {
13705                 if (mtx_owned(&stcb->tcb_mtx)) {
13706                         panic("Leaving with tcb mtx owned?");
13707                 }
13708                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13709                         panic("Leaving with tcb send mtx owned?");
13710                 }
13711         }
13712 #endif
13713         if (top) {
13714                 sctp_m_freem(top);
13715         }
13716         if (control) {
13717                 sctp_m_freem(control);
13718         }
13719         return (error);
13720 }
13721
13722
13723 /*
13724  * generate an AUTHentication chunk, if required
13725  */
13726 struct mbuf *
13727 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13728     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13729     struct sctp_tcb *stcb, uint8_t chunk)
13730 {
13731         struct mbuf *m_auth;
13732         struct sctp_auth_chunk *auth;
13733         int chunk_len;
13734         struct mbuf *cn;
13735
13736         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13737             (stcb == NULL))
13738                 return (m);
13739
13740         if (stcb->asoc.auth_supported == 0) {
13741                 return (m);
13742         }
13743         /* does the requested chunk require auth? */
13744         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13745                 return (m);
13746         }
13747         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13748         if (m_auth == NULL) {
13749                 /* no mbuf's */
13750                 return (m);
13751         }
13752         /* reserve some space if this will be the first mbuf */
13753         if (m == NULL)
13754                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13755         /* fill in the AUTH chunk details */
13756         auth = mtod(m_auth, struct sctp_auth_chunk *);
13757         memset(auth, 0, sizeof(*auth));
13758         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13759         auth->ch.chunk_flags = 0;
13760         chunk_len = sizeof(*auth) +
13761             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13762         auth->ch.chunk_length = htons(chunk_len);
13763         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13764         /* key id and hmac digest will be computed and filled in upon send */
13765
13766         /* save the offset where the auth was inserted into the chain */
13767         *offset = 0;
13768         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13769                 *offset += SCTP_BUF_LEN(cn);
13770         }
13771
13772         /* update length and return pointer to the auth chunk */
13773         SCTP_BUF_LEN(m_auth) = chunk_len;
13774         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13775         if (auth_ret != NULL)
13776                 *auth_ret = auth;
13777
13778         return (m);
13779 }
13780
13781 #ifdef INET6
13782 int
13783 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13784 {
13785         struct nd_prefix *pfx = NULL;
13786         struct nd_pfxrouter *pfxrtr = NULL;
13787         struct sockaddr_in6 gw6;
13788
13789         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13790                 return (0);
13791
13792         /* get prefix entry of address */
13793         ND6_RLOCK();
13794         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13795                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13796                         continue;
13797                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13798                     &src6->sin6_addr, &pfx->ndpr_mask))
13799                         break;
13800         }
13801         /* no prefix entry in the prefix list */
13802         if (pfx == NULL) {
13803                 ND6_RUNLOCK();
13804                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13805                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13806                 return (0);
13807         }
13808
13809         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13810         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13811
13812         /* search installed gateway from prefix entry */
13813         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13814                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13815                 gw6.sin6_family = AF_INET6;
13816                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13817                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13818                     sizeof(struct in6_addr));
13819                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13820                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13821                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13822                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13823                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13824                         ND6_RUNLOCK();
13825                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13826                         return (1);
13827                 }
13828         }
13829         ND6_RUNLOCK();
13830         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13831         return (0);
13832 }
13833 #endif
13834
13835 int
13836 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13837 {
13838 #ifdef INET
13839         struct sockaddr_in *sin, *mask;
13840         struct ifaddr *ifa;
13841         struct in_addr srcnetaddr, gwnetaddr;
13842
13843         if (ro == NULL || ro->ro_rt == NULL ||
13844             sifa->address.sa.sa_family != AF_INET) {
13845                 return (0);
13846         }
13847         ifa = (struct ifaddr *)sifa->ifa;
13848         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13849         sin = &sifa->address.sin;
13850         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13851         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13852         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13853         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13854
13855         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13856         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13857         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13858         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13859         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13860         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13861                 return (1);
13862         }
13863 #endif
13864         return (0);
13865 }