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 inpcb *)inp)->inp_flow);
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 inpcb *)inp)->inp_flow) >> 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, *m_tmp, *op_err, *op_err_last;
4992         int at, limit, pad_needed;
4993         uint16_t ptype, plen, padded_size;
4994
4995         *abort_processing = 0;
4996         mat = in_initpkt;
4997         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4998         at = param_offset;
4999         op_err = NULL;
5000         op_err_last = NULL;
5001         pad_needed = 0;
5002         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5003         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5004         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5005                 ptype = ntohs(phdr->param_type);
5006                 plen = ntohs(phdr->param_length);
5007                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5008                         /* wacked parameter */
5009                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5010                         goto invalid_size;
5011                 }
5012                 limit -= SCTP_SIZE32(plen);
5013                 /*-
5014                  * All parameters for all chunks that we know/understand are
5015                  * listed here. We process them other places and make
5016                  * appropriate stop actions per the upper bits. However this
5017                  * is the generic routine processor's can call to get back
5018                  * an operr.. to either incorporate (init-ack) or send.
5019                  */
5020                 padded_size = SCTP_SIZE32(plen);
5021                 switch (ptype) {
5022                         /* Param's with variable size */
5023                 case SCTP_HEARTBEAT_INFO:
5024                 case SCTP_STATE_COOKIE:
5025                 case SCTP_UNRECOG_PARAM:
5026                 case SCTP_ERROR_CAUSE_IND:
5027                         /* ok skip fwd */
5028                         at += padded_size;
5029                         break;
5030                         /* Param's with variable size within a range */
5031                 case SCTP_CHUNK_LIST:
5032                 case SCTP_SUPPORTED_CHUNK_EXT:
5033                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5034                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5035                                 goto invalid_size;
5036                         }
5037                         at += padded_size;
5038                         break;
5039                 case SCTP_SUPPORTED_ADDRTYPE:
5040                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                 case SCTP_RANDOM:
5047                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5049                                 goto invalid_size;
5050                         }
5051                         at += padded_size;
5052                         break;
5053                 case SCTP_SET_PRIM_ADDR:
5054                 case SCTP_DEL_IP_ADDRESS:
5055                 case SCTP_ADD_IP_ADDRESS:
5056                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5057                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5059                                 goto invalid_size;
5060                         }
5061                         at += padded_size;
5062                         break;
5063                         /* Param's with a fixed size */
5064                 case SCTP_IPV4_ADDRESS:
5065                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5066                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5067                                 goto invalid_size;
5068                         }
5069                         at += padded_size;
5070                         break;
5071                 case SCTP_IPV6_ADDRESS:
5072                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_COOKIE_PRESERVE:
5079                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5081                                 goto invalid_size;
5082                         }
5083                         at += padded_size;
5084                         break;
5085                 case SCTP_HAS_NAT_SUPPORT:
5086                         *nat_friendly = 1;
5087                         /* fall through */
5088                 case SCTP_PRSCTP_SUPPORTED:
5089                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5091                                 goto invalid_size;
5092                         }
5093                         at += padded_size;
5094                         break;
5095                 case SCTP_ECN_CAPABLE:
5096                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5097                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5098                                 goto invalid_size;
5099                         }
5100                         at += padded_size;
5101                         break;
5102                 case SCTP_ULP_ADAPTATION:
5103                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5104                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5105                                 goto invalid_size;
5106                         }
5107                         at += padded_size;
5108                         break;
5109                 case SCTP_SUCCESS_REPORT:
5110                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5111                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5112                                 goto invalid_size;
5113                         }
5114                         at += padded_size;
5115                         break;
5116                 case SCTP_HOSTNAME_ADDRESS:
5117                         {
5118                                 /* Hostname parameters are deprecated. */
5119                                 struct sctp_gen_error_cause *cause;
5120                                 int l_len;
5121
5122                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5123                                 *abort_processing = 1;
5124                                 sctp_m_freem(op_err);
5125                                 op_err = NULL;
5126                                 op_err_last = NULL;
5127 #ifdef INET6
5128                                 l_len = SCTP_MIN_OVERHEAD;
5129 #else
5130                                 l_len = SCTP_MIN_V4_OVERHEAD;
5131 #endif
5132                                 l_len += sizeof(struct sctp_chunkhdr);
5133                                 l_len += sizeof(struct sctp_gen_error_cause);
5134                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5135                                 if (op_err != NULL) {
5136                                         /*
5137                                          * Pre-reserve space for IP, SCTP,
5138                                          * and chunk header.
5139                                          */
5140 #ifdef INET6
5141                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5142 #else
5143                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5144 #endif
5145                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5146                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5147                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5148                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5149                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5150                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5151                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5152                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5153                                                 sctp_m_freem(op_err);
5154                                                 op_err = NULL;
5155                                                 op_err_last = NULL;
5156                                         }
5157                                 }
5158                                 return (op_err);
5159                                 break;
5160                         }
5161                 default:
5162                         /*
5163                          * we do not recognize the parameter figure out what
5164                          * we do.
5165                          */
5166                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5167                         if ((ptype & 0x4000) == 0x4000) {
5168                                 /* Report bit is set?? */
5169                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5170                                 if (op_err == NULL) {
5171                                         int l_len;
5172
5173                                         /* Ok need to try to get an mbuf */
5174 #ifdef INET6
5175                                         l_len = SCTP_MIN_OVERHEAD;
5176 #else
5177                                         l_len = SCTP_MIN_V4_OVERHEAD;
5178 #endif
5179                                         l_len += sizeof(struct sctp_chunkhdr);
5180                                         l_len += sizeof(struct sctp_paramhdr);
5181                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5182                                         if (op_err) {
5183                                                 SCTP_BUF_LEN(op_err) = 0;
5184 #ifdef INET6
5185                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5186 #else
5187                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5188 #endif
5189                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5190                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5191                                                 op_err_last = op_err;
5192                                         }
5193                                 }
5194                                 if (op_err != NULL) {
5195                                         /* If we have space */
5196                                         struct sctp_paramhdr *param;
5197
5198                                         if (pad_needed > 0) {
5199                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5200                                         }
5201                                         if (op_err_last == NULL) {
5202                                                 sctp_m_freem(op_err);
5203                                                 op_err = NULL;
5204                                                 op_err_last = NULL;
5205                                                 goto more_processing;
5206                                         }
5207                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5208                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5209                                                 if (m_tmp == NULL) {
5210                                                         sctp_m_freem(op_err);
5211                                                         op_err = NULL;
5212                                                         op_err_last = NULL;
5213                                                         goto more_processing;
5214                                                 }
5215                                                 SCTP_BUF_LEN(m_tmp) = 0;
5216                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5217                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5218                                                 op_err_last = m_tmp;
5219                                         }
5220                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5221                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5222                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5223                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5224                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5225                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5226                                                 sctp_m_freem(op_err);
5227                                                 op_err = NULL;
5228                                                 op_err_last = NULL;
5229                                                 goto more_processing;
5230                                         } else {
5231                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5232                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5233                                                 }
5234                                         }
5235                                         if (plen % 4 != 0) {
5236                                                 pad_needed = 4 - (plen % 4);
5237                                         } else {
5238                                                 pad_needed = 0;
5239                                         }
5240                                 }
5241                         }
5242         more_processing:
5243                         if ((ptype & 0x8000) == 0x0000) {
5244                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5245                                 return (op_err);
5246                         } else {
5247                                 /* skip this chunk and continue processing */
5248                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5249                                 at += SCTP_SIZE32(plen);
5250                         }
5251                         break;
5252
5253                 }
5254                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5255         }
5256         return (op_err);
5257 invalid_size:
5258         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5259         *abort_processing = 1;
5260         sctp_m_freem(op_err);
5261         op_err = NULL;
5262         op_err_last = NULL;
5263         if (phdr != NULL) {
5264                 struct sctp_paramhdr *param;
5265                 int l_len;
5266 #ifdef INET6
5267                 l_len = SCTP_MIN_OVERHEAD;
5268 #else
5269                 l_len = SCTP_MIN_V4_OVERHEAD;
5270 #endif
5271                 l_len += sizeof(struct sctp_chunkhdr);
5272                 l_len += (2 * sizeof(struct sctp_paramhdr));
5273                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5274                 if (op_err) {
5275                         SCTP_BUF_LEN(op_err) = 0;
5276 #ifdef INET6
5277                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5278 #else
5279                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5280 #endif
5281                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5282                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5283                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5284                         param = mtod(op_err, struct sctp_paramhdr *);
5285                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5286                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5287                         param++;
5288                         param->param_type = htons(ptype);
5289                         param->param_length = htons(plen);
5290                 }
5291         }
5292         return (op_err);
5293 }
5294
5295 static int
5296 sctp_are_there_new_addresses(struct sctp_association *asoc,
5297     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5298 {
5299         /*
5300          * Given a INIT packet, look through the packet to verify that there
5301          * are NO new addresses. As we go through the parameters add reports
5302          * of any un-understood parameters that require an error.  Also we
5303          * must return (1) to drop the packet if we see a un-understood
5304          * parameter that tells us to drop the chunk.
5305          */
5306         struct sockaddr *sa_touse;
5307         struct sockaddr *sa;
5308         struct sctp_paramhdr *phdr, params;
5309         uint16_t ptype, plen;
5310         uint8_t fnd;
5311         struct sctp_nets *net;
5312         int check_src;
5313 #ifdef INET
5314         struct sockaddr_in sin4, *sa4;
5315 #endif
5316 #ifdef INET6
5317         struct sockaddr_in6 sin6, *sa6;
5318 #endif
5319
5320 #ifdef INET
5321         memset(&sin4, 0, sizeof(sin4));
5322         sin4.sin_family = AF_INET;
5323         sin4.sin_len = sizeof(sin4);
5324 #endif
5325 #ifdef INET6
5326         memset(&sin6, 0, sizeof(sin6));
5327         sin6.sin6_family = AF_INET6;
5328         sin6.sin6_len = sizeof(sin6);
5329 #endif
5330         /* First what about the src address of the pkt ? */
5331         check_src = 0;
5332         switch (src->sa_family) {
5333 #ifdef INET
5334         case AF_INET:
5335                 if (asoc->scope.ipv4_addr_legal) {
5336                         check_src = 1;
5337                 }
5338                 break;
5339 #endif
5340 #ifdef INET6
5341         case AF_INET6:
5342                 if (asoc->scope.ipv6_addr_legal) {
5343                         check_src = 1;
5344                 }
5345                 break;
5346 #endif
5347         default:
5348                 /* TSNH */
5349                 break;
5350         }
5351         if (check_src) {
5352                 fnd = 0;
5353                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5354                         sa = (struct sockaddr *)&net->ro._l_addr;
5355                         if (sa->sa_family == src->sa_family) {
5356 #ifdef INET
5357                                 if (sa->sa_family == AF_INET) {
5358                                         struct sockaddr_in *src4;
5359
5360                                         sa4 = (struct sockaddr_in *)sa;
5361                                         src4 = (struct sockaddr_in *)src;
5362                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5363                                                 fnd = 1;
5364                                                 break;
5365                                         }
5366                                 }
5367 #endif
5368 #ifdef INET6
5369                                 if (sa->sa_family == AF_INET6) {
5370                                         struct sockaddr_in6 *src6;
5371
5372                                         sa6 = (struct sockaddr_in6 *)sa;
5373                                         src6 = (struct sockaddr_in6 *)src;
5374                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5375                                                 fnd = 1;
5376                                                 break;
5377                                         }
5378                                 }
5379 #endif
5380                         }
5381                 }
5382                 if (fnd == 0) {
5383                         /* New address added! no need to look further. */
5384                         return (1);
5385                 }
5386         }
5387         /* Ok so far lets munge through the rest of the packet */
5388         offset += sizeof(struct sctp_init_chunk);
5389         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5390         while (phdr) {
5391                 sa_touse = NULL;
5392                 ptype = ntohs(phdr->param_type);
5393                 plen = ntohs(phdr->param_length);
5394                 switch (ptype) {
5395 #ifdef INET
5396                 case SCTP_IPV4_ADDRESS:
5397                         {
5398                                 struct sctp_ipv4addr_param *p4, p4_buf;
5399
5400                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5401                                         return (1);
5402                                 }
5403                                 phdr = sctp_get_next_param(in_initpkt, offset,
5404                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5405                                 if (phdr == NULL) {
5406                                         return (1);
5407                                 }
5408                                 if (asoc->scope.ipv4_addr_legal) {
5409                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5410                                         sin4.sin_addr.s_addr = p4->addr;
5411                                         sa_touse = (struct sockaddr *)&sin4;
5412                                 }
5413                                 break;
5414                         }
5415 #endif
5416 #ifdef INET6
5417                 case SCTP_IPV6_ADDRESS:
5418                         {
5419                                 struct sctp_ipv6addr_param *p6, p6_buf;
5420
5421                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5422                                         return (1);
5423                                 }
5424                                 phdr = sctp_get_next_param(in_initpkt, offset,
5425                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5426                                 if (phdr == NULL) {
5427                                         return (1);
5428                                 }
5429                                 if (asoc->scope.ipv6_addr_legal) {
5430                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5431                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5432                                             sizeof(p6->addr));
5433                                         sa_touse = (struct sockaddr *)&sin6;
5434                                 }
5435                                 break;
5436                         }
5437 #endif
5438                 default:
5439                         sa_touse = NULL;
5440                         break;
5441                 }
5442                 if (sa_touse) {
5443                         /* ok, sa_touse points to one to check */
5444                         fnd = 0;
5445                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5446                                 sa = (struct sockaddr *)&net->ro._l_addr;
5447                                 if (sa->sa_family != sa_touse->sa_family) {
5448                                         continue;
5449                                 }
5450 #ifdef INET
5451                                 if (sa->sa_family == AF_INET) {
5452                                         sa4 = (struct sockaddr_in *)sa;
5453                                         if (sa4->sin_addr.s_addr ==
5454                                             sin4.sin_addr.s_addr) {
5455                                                 fnd = 1;
5456                                                 break;
5457                                         }
5458                                 }
5459 #endif
5460 #ifdef INET6
5461                                 if (sa->sa_family == AF_INET6) {
5462                                         sa6 = (struct sockaddr_in6 *)sa;
5463                                         if (SCTP6_ARE_ADDR_EQUAL(
5464                                             sa6, &sin6)) {
5465                                                 fnd = 1;
5466                                                 break;
5467                                         }
5468                                 }
5469 #endif
5470                         }
5471                         if (!fnd) {
5472                                 /* New addr added! no need to look further */
5473                                 return (1);
5474                         }
5475                 }
5476                 offset += SCTP_SIZE32(plen);
5477                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5478         }
5479         return (0);
5480 }
5481
5482 /*
5483  * Given a MBUF chain that was sent into us containing an INIT. Build a
5484  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5485  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5486  * message (i.e. the struct sctp_init_msg).
5487  */
5488 void
5489 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5490     struct sctp_nets *src_net, struct mbuf *init_pkt,
5491     int iphlen, int offset,
5492     struct sockaddr *src, struct sockaddr *dst,
5493     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5494     uint8_t mflowtype, uint32_t mflowid,
5495     uint32_t vrf_id, uint16_t port)
5496 {
5497         struct sctp_association *asoc;
5498         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5499         struct sctp_init_ack_chunk *initack;
5500         struct sctp_adaptation_layer_indication *ali;
5501         struct sctp_supported_chunk_types_param *pr_supported;
5502         struct sctp_paramhdr *ph;
5503         union sctp_sockstore *over_addr;
5504         struct sctp_scoping scp;
5505         struct timeval now;
5506 #ifdef INET
5507         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5508         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5509         struct sockaddr_in *sin;
5510 #endif
5511 #ifdef INET6
5512         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5513         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5514         struct sockaddr_in6 *sin6;
5515 #endif
5516         struct sockaddr *to;
5517         struct sctp_state_cookie stc;
5518         struct sctp_nets *net = NULL;
5519         uint8_t *signature = NULL;
5520         int cnt_inits_to = 0;
5521         uint16_t his_limit, i_want;
5522         int abort_flag;
5523         int nat_friendly = 0;
5524         int error;
5525         struct socket *so;
5526         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5527
5528         if (stcb) {
5529                 asoc = &stcb->asoc;
5530         } else {
5531                 asoc = NULL;
5532         }
5533         if ((asoc != NULL) &&
5534             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5535                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5536                         /*
5537                          * new addresses, out of here in non-cookie-wait
5538                          * states
5539                          *
5540                          * Send an ABORT, without the new address error
5541                          * cause. This looks no different than if no
5542                          * listener was present.
5543                          */
5544                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5545                             "Address added");
5546                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5547                             mflowtype, mflowid, inp->fibnum,
5548                             vrf_id, port);
5549                         return;
5550                 }
5551                 if (src_net != NULL && (src_net->port != port)) {
5552                         /*
5553                          * change of remote encapsulation port, out of here
5554                          * in non-cookie-wait states
5555                          *
5556                          * Send an ABORT, without an specific error cause.
5557                          * This looks no different than if no listener was
5558                          * present.
5559                          */
5560                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5561                             "Remote encapsulation port changed");
5562                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5563                             mflowtype, mflowid, inp->fibnum,
5564                             vrf_id, port);
5565                         return;
5566                 }
5567         }
5568         abort_flag = 0;
5569         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5570             (offset + sizeof(struct sctp_init_chunk)),
5571             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5572         if (abort_flag) {
5573 do_a_abort:
5574                 if (op_err == NULL) {
5575                         char msg[SCTP_DIAG_INFO_LEN];
5576
5577                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5578                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5579                             msg);
5580                 }
5581                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5582                     init_chk->init.initiate_tag, op_err,
5583                     mflowtype, mflowid, inp->fibnum,
5584                     vrf_id, port);
5585                 return;
5586         }
5587         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5588         if (m == NULL) {
5589                 /* No memory, INIT timer will re-attempt. */
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                                         sctp_m_freem(op_err);
5781                                         sctp_m_freem(m);
5782                                         return;
5783                                 }
5784
5785                                 net->src_addr_selected = 1;
5786
5787                         }
5788                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5789                         stc.laddress[1] = 0;
5790                         stc.laddress[2] = 0;
5791                         stc.laddress[3] = 0;
5792                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5793                         /* scope_id is only for v6 */
5794                         stc.scope_id = 0;
5795                         break;
5796 #endif
5797 #ifdef INET6
5798                 case AF_INET6:
5799                         sin6 = (struct sockaddr_in6 *)to;
5800                         memcpy(&stc.address, &sin6->sin6_addr,
5801                             sizeof(struct in6_addr));
5802                         stc.addr_type = SCTP_IPV6_ADDRESS;
5803                         stc.scope_id = sin6->sin6_scope_id;
5804                         if (net->src_addr_selected == 0) {
5805                                 /*
5806                                  * strange case here, the INIT should have
5807                                  * done the selection.
5808                                  */
5809                                 net->ro._s_addr = sctp_source_address_selection(inp,
5810                                     stcb, (sctp_route_t *)&net->ro,
5811                                     net, 0, vrf_id);
5812                                 if (net->ro._s_addr == NULL) {
5813                                         sctp_m_freem(op_err);
5814                                         sctp_m_freem(m);
5815                                         return;
5816                                 }
5817
5818                                 net->src_addr_selected = 1;
5819                         }
5820                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5821                             sizeof(struct in6_addr));
5822                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5823                         break;
5824 #endif
5825                 }
5826         }
5827         /* Now lets put the SCTP header in place */
5828         initack = mtod(m, struct sctp_init_ack_chunk *);
5829         /* Save it off for quick ref */
5830         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5831         /* who are we */
5832         memcpy(stc.identification, SCTP_VERSION_STRING,
5833             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5834         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5835         /* now the chunk header */
5836         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5837         initack->ch.chunk_flags = 0;
5838         /* fill in later from mbuf we build */
5839         initack->ch.chunk_length = 0;
5840         /* place in my tag */
5841         if ((asoc != NULL) &&
5842             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5843             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5844             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5845                 /* re-use the v-tags and init-seq here */
5846                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5847                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5848         } else {
5849                 uint32_t vtag, itsn;
5850
5851                 if (asoc) {
5852                         atomic_add_int(&asoc->refcnt, 1);
5853                         SCTP_TCB_UNLOCK(stcb);
5854         new_tag:
5855                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5856                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5857                                 /*
5858                                  * Got a duplicate vtag on some guy behind a
5859                                  * nat make sure we don't use it.
5860                                  */
5861                                 goto new_tag;
5862                         }
5863                         initack->init.initiate_tag = htonl(vtag);
5864                         /* get a TSN to use too */
5865                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5866                         initack->init.initial_tsn = htonl(itsn);
5867                         SCTP_TCB_LOCK(stcb);
5868                         atomic_add_int(&asoc->refcnt, -1);
5869                 } else {
5870                         SCTP_INP_INCR_REF(inp);
5871                         SCTP_INP_RUNLOCK(inp);
5872                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5873                         initack->init.initiate_tag = htonl(vtag);
5874                         /* get a TSN to use too */
5875                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5876                         SCTP_INP_RLOCK(inp);
5877                         SCTP_INP_DECR_REF(inp);
5878                 }
5879         }
5880         /* save away my tag to */
5881         stc.my_vtag = initack->init.initiate_tag;
5882
5883         /* set up some of the credits. */
5884         so = inp->sctp_socket;
5885         if (so == NULL) {
5886                 /* memory problem */
5887                 sctp_m_freem(op_err);
5888                 sctp_m_freem(m);
5889                 return;
5890         } else {
5891                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5892         }
5893         /* set what I want */
5894         his_limit = ntohs(init_chk->init.num_inbound_streams);
5895         /* choose what I want */
5896         if (asoc != NULL) {
5897                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5898                         i_want = asoc->streamoutcnt;
5899                 } else {
5900                         i_want = asoc->pre_open_streams;
5901                 }
5902         } else {
5903                 i_want = inp->sctp_ep.pre_open_stream_count;
5904         }
5905         if (his_limit < i_want) {
5906                 /* I Want more :< */
5907                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5908         } else {
5909                 /* I can have what I want :> */
5910                 initack->init.num_outbound_streams = htons(i_want);
5911         }
5912         /* tell him his limit. */
5913         initack->init.num_inbound_streams =
5914             htons(inp->sctp_ep.max_open_streams_intome);
5915
5916         /* adaptation layer indication parameter */
5917         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5918                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5919                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5920                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5921                 ali->ph.param_length = htons(parameter_len);
5922                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5923                 chunk_len += parameter_len;
5924         }
5925
5926         /* ECN parameter */
5927         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5928             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5929                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5930                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5931                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5932                 ph->param_length = htons(parameter_len);
5933                 chunk_len += parameter_len;
5934         }
5935
5936         /* PR-SCTP supported parameter */
5937         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5938             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5939                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5940                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5941                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5942                 ph->param_length = htons(parameter_len);
5943                 chunk_len += parameter_len;
5944         }
5945
5946         /* Add NAT friendly parameter */
5947         if (nat_friendly) {
5948                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5949                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5950                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5951                 ph->param_length = htons(parameter_len);
5952                 chunk_len += parameter_len;
5953         }
5954
5955         /* And now tell the peer which extensions we support */
5956         num_ext = 0;
5957         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5958         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5959             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5960                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5961                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5962                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5963                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5964                 }
5965         }
5966         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5967             ((asoc == NULL) && (inp->auth_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5969         }
5970         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5971             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5973                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5974         }
5975         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5976             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5977                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5978         }
5979         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5980             ((asoc == NULL) && (inp->idata_supported == 1))) {
5981                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5982         }
5983         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5984             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5985                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5986         }
5987         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5988             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5989                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5990         }
5991         if (num_ext > 0) {
5992                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5993                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5994                 pr_supported->ph.param_length = htons(parameter_len);
5995                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5996                 chunk_len += parameter_len;
5997         }
5998
5999         /* add authentication parameters */
6000         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6001             ((asoc == NULL) && (inp->auth_supported == 1))) {
6002                 struct sctp_auth_random *randp;
6003                 struct sctp_auth_hmac_algo *hmacs;
6004                 struct sctp_auth_chunk_list *chunks;
6005
6006                 if (padding_len > 0) {
6007                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6008                         chunk_len += padding_len;
6009                         padding_len = 0;
6010                 }
6011                 /* generate and add RANDOM parameter */
6012                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6013                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6014                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6015                 randp->ph.param_type = htons(SCTP_RANDOM);
6016                 randp->ph.param_length = htons(parameter_len);
6017                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6018                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6019                 chunk_len += parameter_len;
6020
6021                 if (padding_len > 0) {
6022                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6023                         chunk_len += padding_len;
6024                         padding_len = 0;
6025                 }
6026                 /* add HMAC_ALGO parameter */
6027                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6028                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6029                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6030                     (uint8_t *)hmacs->hmac_ids);
6031                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6032                 hmacs->ph.param_length = htons(parameter_len);
6033                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6034                 chunk_len += parameter_len;
6035
6036                 if (padding_len > 0) {
6037                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6038                         chunk_len += padding_len;
6039                         padding_len = 0;
6040                 }
6041                 /* add CHUNKS parameter */
6042                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6043                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6044                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6045                     chunks->chunk_types);
6046                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6047                 chunks->ph.param_length = htons(parameter_len);
6048                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6049                 chunk_len += parameter_len;
6050         }
6051         SCTP_BUF_LEN(m) = chunk_len;
6052         m_last = m;
6053         /* now the addresses */
6054         /*
6055          * To optimize this we could put the scoping stuff into a structure
6056          * and remove the individual uint8's from the stc structure. Then we
6057          * could just sifa in the address within the stc.. but for now this
6058          * is a quick hack to get the address stuff teased apart.
6059          */
6060         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6061         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6062         scp.loopback_scope = stc.loopback_scope;
6063         scp.ipv4_local_scope = stc.ipv4_scope;
6064         scp.local_scope = stc.local_scope;
6065         scp.site_scope = stc.site_scope;
6066         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6067             cnt_inits_to,
6068             &padding_len, &chunk_len);
6069         /* padding_len can only be positive, if no addresses have been added */
6070         if (padding_len > 0) {
6071                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6072                 chunk_len += padding_len;
6073                 SCTP_BUF_LEN(m) += padding_len;
6074                 padding_len = 0;
6075         }
6076
6077         /* tack on the operational error if present */
6078         if (op_err) {
6079                 parameter_len = 0;
6080                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6081                         parameter_len += SCTP_BUF_LEN(m_tmp);
6082                 }
6083                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6084                 SCTP_BUF_NEXT(m_last) = op_err;
6085                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6086                         m_last = SCTP_BUF_NEXT(m_last);
6087                 }
6088                 chunk_len += parameter_len;
6089         }
6090         if (padding_len > 0) {
6091                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6092                 if (m_last == NULL) {
6093                         /* Houston we have a problem, no space */
6094                         sctp_m_freem(m);
6095                         return;
6096                 }
6097                 chunk_len += padding_len;
6098                 padding_len = 0;
6099         }
6100         /* Now we must build a cookie */
6101         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6102         if (m_cookie == NULL) {
6103                 /* memory problem */
6104                 sctp_m_freem(m);
6105                 return;
6106         }
6107         /* Now append the cookie to the end and update the space/size */
6108         SCTP_BUF_NEXT(m_last) = m_cookie;
6109         parameter_len = 0;
6110         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6111                 parameter_len += SCTP_BUF_LEN(m_tmp);
6112                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6113                         m_last = m_tmp;
6114                 }
6115         }
6116         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6117         chunk_len += parameter_len;
6118
6119         /*
6120          * Place in the size, but we don't include the last pad (if any) in
6121          * the INIT-ACK.
6122          */
6123         initack->ch.chunk_length = htons(chunk_len);
6124
6125         /*
6126          * Time to sign the cookie, we don't sign over the cookie signature
6127          * though thus we set trailer.
6128          */
6129         (void)sctp_hmac_m(SCTP_HMAC,
6130             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6131             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6132             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6133         /*
6134          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6135          * here since the timer will drive a retranmission.
6136          */
6137         if (padding_len > 0) {
6138                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6139                         sctp_m_freem(m);
6140                         return;
6141                 }
6142         }
6143         if (stc.loopback_scope) {
6144                 over_addr = (union sctp_sockstore *)dst;
6145         } else {
6146                 over_addr = NULL;
6147         }
6148
6149         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6150             0, 0,
6151             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6152             port, over_addr,
6153             mflowtype, mflowid,
6154             SCTP_SO_NOT_LOCKED))) {
6155                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6156                 if (error == ENOBUFS) {
6157                         if (asoc != NULL) {
6158                                 asoc->ifp_had_enobuf = 1;
6159                         }
6160                         SCTP_STAT_INCR(sctps_lowlevelerr);
6161                 }
6162         } else {
6163                 if (asoc != NULL) {
6164                         asoc->ifp_had_enobuf = 0;
6165                 }
6166         }
6167         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6168 }
6169
6170
6171 static void
6172 sctp_prune_prsctp(struct sctp_tcb *stcb,
6173     struct sctp_association *asoc,
6174     struct sctp_sndrcvinfo *srcv,
6175     int dataout)
6176 {
6177         int freed_spc = 0;
6178         struct sctp_tmit_chunk *chk, *nchk;
6179
6180         SCTP_TCB_LOCK_ASSERT(stcb);
6181         if ((asoc->prsctp_supported) &&
6182             (asoc->sent_queue_cnt_removeable > 0)) {
6183                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6184                         /*
6185                          * Look for chunks marked with the PR_SCTP flag AND
6186                          * the buffer space flag. If the one being sent is
6187                          * equal or greater priority then purge the old one
6188                          * and free some space.
6189                          */
6190                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6191                                 /*
6192                                  * This one is PR-SCTP AND buffer space
6193                                  * limited type
6194                                  */
6195                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6196                                         /*
6197                                          * Lower numbers equates to higher
6198                                          * priority so if the one we are
6199                                          * looking at has a larger or equal
6200                                          * priority we want to drop the data
6201                                          * and NOT retransmit it.
6202                                          */
6203                                         if (chk->data) {
6204                                                 /*
6205                                                  * We release the book_size
6206                                                  * if the mbuf is here
6207                                                  */
6208                                                 int ret_spc;
6209                                                 uint8_t sent;
6210
6211                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6212                                                         sent = 1;
6213                                                 else
6214                                                         sent = 0;
6215                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6216                                                     sent,
6217                                                     SCTP_SO_LOCKED);
6218                                                 freed_spc += ret_spc;
6219                                                 if (freed_spc >= dataout) {
6220                                                         return;
6221                                                 }
6222                                         }       /* if chunk was present */
6223                                 }       /* if of sufficient priority */
6224                         }       /* if chunk has enabled */
6225                 }               /* tailqforeach */
6226
6227                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6228                         /* Here we must move to the sent queue and mark */
6229                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6230                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6231                                         if (chk->data) {
6232                                                 /*
6233                                                  * We release the book_size
6234                                                  * if the mbuf is here
6235                                                  */
6236                                                 int ret_spc;
6237
6238                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6239                                                     0, SCTP_SO_LOCKED);
6240
6241                                                 freed_spc += ret_spc;
6242                                                 if (freed_spc >= dataout) {
6243                                                         return;
6244                                                 }
6245                                         }       /* end if chk->data */
6246                                 }       /* end if right class */
6247                         }       /* end if chk pr-sctp */
6248                 }               /* tailqforeachsafe (chk) */
6249         }                       /* if enabled in asoc */
6250 }
6251
6252 int
6253 sctp_get_frag_point(struct sctp_tcb *stcb,
6254     struct sctp_association *asoc)
6255 {
6256         int siz, ovh;
6257
6258         /*
6259          * For endpoints that have both v6 and v4 addresses we must reserve
6260          * room for the ipv6 header, for those that are only dealing with V4
6261          * we use a larger frag point.
6262          */
6263         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6264                 ovh = SCTP_MIN_OVERHEAD;
6265         } else {
6266                 ovh = SCTP_MIN_V4_OVERHEAD;
6267         }
6268         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6269         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6270                 siz = asoc->smallest_mtu - ovh;
6271         else
6272                 siz = (stcb->asoc.sctp_frag_point - ovh);
6273         /*
6274          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6275          */
6276         /* A data chunk MUST fit in a cluster */
6277         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6278         /* } */
6279
6280         /* adjust for an AUTH chunk if DATA requires auth */
6281         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6282                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6283
6284         if (siz % 4) {
6285                 /* make it an even word boundary please */
6286                 siz -= (siz % 4);
6287         }
6288         return (siz);
6289 }
6290
6291 static void
6292 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6293 {
6294         /*
6295          * We assume that the user wants PR_SCTP_TTL if the user provides a
6296          * positive lifetime but does not specify any PR_SCTP policy.
6297          */
6298         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6299                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6300         } else if (sp->timetolive > 0) {
6301                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6302                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6303         } else {
6304                 return;
6305         }
6306         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6307         case CHUNK_FLAGS_PR_SCTP_BUF:
6308                 /*
6309                  * Time to live is a priority stored in tv_sec when doing
6310                  * the buffer drop thing.
6311                  */
6312                 sp->ts.tv_sec = sp->timetolive;
6313                 sp->ts.tv_usec = 0;
6314                 break;
6315         case CHUNK_FLAGS_PR_SCTP_TTL:
6316                 {
6317                         struct timeval tv;
6318
6319                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6320                         tv.tv_sec = sp->timetolive / 1000;
6321                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6322                         /*
6323                          * TODO sctp_constants.h needs alternative time
6324                          * macros when _KERNEL is undefined.
6325                          */
6326                         timevaladd(&sp->ts, &tv);
6327                 }
6328                 break;
6329         case CHUNK_FLAGS_PR_SCTP_RTX:
6330                 /*
6331                  * Time to live is a the number or retransmissions stored in
6332                  * tv_sec.
6333                  */
6334                 sp->ts.tv_sec = sp->timetolive;
6335                 sp->ts.tv_usec = 0;
6336                 break;
6337         default:
6338                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6339                     "Unknown PR_SCTP policy %u.\n",
6340                     PR_SCTP_POLICY(sp->sinfo_flags));
6341                 break;
6342         }
6343 }
6344
6345 static int
6346 sctp_msg_append(struct sctp_tcb *stcb,
6347     struct sctp_nets *net,
6348     struct mbuf *m,
6349     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6350 {
6351         int error = 0;
6352         struct mbuf *at;
6353         struct sctp_stream_queue_pending *sp = NULL;
6354         struct sctp_stream_out *strm;
6355
6356         /*
6357          * Given an mbuf chain, put it into the association send queue and
6358          * place it on the wheel
6359          */
6360         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6361                 /* Invalid stream number */
6362                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6363                 error = EINVAL;
6364                 goto out_now;
6365         }
6366         if ((stcb->asoc.stream_locked) &&
6367             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6368                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6369                 error = EINVAL;
6370                 goto out_now;
6371         }
6372         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6373         /* Now can we send this? */
6374         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6375             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6376             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6377             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6378                 /* got data while shutting down */
6379                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6380                 error = ECONNRESET;
6381                 goto out_now;
6382         }
6383         sctp_alloc_a_strmoq(stcb, sp);
6384         if (sp == NULL) {
6385                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6386                 error = ENOMEM;
6387                 goto out_now;
6388         }
6389         sp->sinfo_flags = srcv->sinfo_flags;
6390         sp->timetolive = srcv->sinfo_timetolive;
6391         sp->ppid = srcv->sinfo_ppid;
6392         sp->context = srcv->sinfo_context;
6393         sp->fsn = 0;
6394         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6395                 sp->net = net;
6396                 atomic_add_int(&sp->net->ref_count, 1);
6397         } else {
6398                 sp->net = NULL;
6399         }
6400         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6401         sp->sid = srcv->sinfo_stream;
6402         sp->msg_is_complete = 1;
6403         sp->sender_all_done = 1;
6404         sp->some_taken = 0;
6405         sp->data = m;
6406         sp->tail_mbuf = NULL;
6407         sctp_set_prsctp_policy(sp);
6408         /*
6409          * We could in theory (for sendall) sifa the length in, but we would
6410          * still have to hunt through the chain since we need to setup the
6411          * tail_mbuf
6412          */
6413         sp->length = 0;
6414         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6415                 if (SCTP_BUF_NEXT(at) == NULL)
6416                         sp->tail_mbuf = at;
6417                 sp->length += SCTP_BUF_LEN(at);
6418         }
6419         if (srcv->sinfo_keynumber_valid) {
6420                 sp->auth_keyid = srcv->sinfo_keynumber;
6421         } else {
6422                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6423         }
6424         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6425                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6426                 sp->holds_key_ref = 1;
6427         }
6428         if (hold_stcb_lock == 0) {
6429                 SCTP_TCB_SEND_LOCK(stcb);
6430         }
6431         sctp_snd_sb_alloc(stcb, sp->length);
6432         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6433         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6434         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6435         m = NULL;
6436         if (hold_stcb_lock == 0) {
6437                 SCTP_TCB_SEND_UNLOCK(stcb);
6438         }
6439 out_now:
6440         if (m) {
6441                 sctp_m_freem(m);
6442         }
6443         return (error);
6444 }
6445
6446
6447 static struct mbuf *
6448 sctp_copy_mbufchain(struct mbuf *clonechain,
6449     struct mbuf *outchain,
6450     struct mbuf **endofchain,
6451     int can_take_mbuf,
6452     int sizeofcpy,
6453     uint8_t copy_by_ref)
6454 {
6455         struct mbuf *m;
6456         struct mbuf *appendchain;
6457         caddr_t cp;
6458         int len;
6459
6460         if (endofchain == NULL) {
6461                 /* error */
6462 error_out:
6463                 if (outchain)
6464                         sctp_m_freem(outchain);
6465                 return (NULL);
6466         }
6467         if (can_take_mbuf) {
6468                 appendchain = clonechain;
6469         } else {
6470                 if (!copy_by_ref &&
6471                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6472                     ) {
6473                         /* Its not in a cluster */
6474                         if (*endofchain == NULL) {
6475                                 /* lets get a mbuf cluster */
6476                                 if (outchain == NULL) {
6477                                         /* This is the general case */
6478                         new_mbuf:
6479                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6480                                         if (outchain == NULL) {
6481                                                 goto error_out;
6482                                         }
6483                                         SCTP_BUF_LEN(outchain) = 0;
6484                                         *endofchain = outchain;
6485                                         /* get the prepend space */
6486                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6487                                 } else {
6488                                         /*
6489                                          * We really should not get a NULL
6490                                          * in endofchain
6491                                          */
6492                                         /* find end */
6493                                         m = outchain;
6494                                         while (m) {
6495                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6496                                                         *endofchain = m;
6497                                                         break;
6498                                                 }
6499                                                 m = SCTP_BUF_NEXT(m);
6500                                         }
6501                                         /* sanity */
6502                                         if (*endofchain == NULL) {
6503                                                 /*
6504                                                  * huh, TSNH XXX maybe we
6505                                                  * should panic
6506                                                  */
6507                                                 sctp_m_freem(outchain);
6508                                                 goto new_mbuf;
6509                                         }
6510                                 }
6511                                 /* get the new end of length */
6512                                 len = (int)M_TRAILINGSPACE(*endofchain);
6513                         } else {
6514                                 /* how much is left at the end? */
6515                                 len = (int)M_TRAILINGSPACE(*endofchain);
6516                         }
6517                         /* Find the end of the data, for appending */
6518                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6519
6520                         /* Now lets copy it out */
6521                         if (len >= sizeofcpy) {
6522                                 /* It all fits, copy it in */
6523                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6524                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6525                         } else {
6526                                 /* fill up the end of the chain */
6527                                 if (len > 0) {
6528                                         m_copydata(clonechain, 0, len, cp);
6529                                         SCTP_BUF_LEN((*endofchain)) += len;
6530                                         /* now we need another one */
6531                                         sizeofcpy -= len;
6532                                 }
6533                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6534                                 if (m == NULL) {
6535                                         /* We failed */
6536                                         goto error_out;
6537                                 }
6538                                 SCTP_BUF_NEXT((*endofchain)) = m;
6539                                 *endofchain = m;
6540                                 cp = mtod((*endofchain), caddr_t);
6541                                 m_copydata(clonechain, len, sizeofcpy, cp);
6542                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6543                         }
6544                         return (outchain);
6545                 } else {
6546                         /* copy the old fashion way */
6547                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6548 #ifdef SCTP_MBUF_LOGGING
6549                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6550                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6551                         }
6552 #endif
6553                 }
6554         }
6555         if (appendchain == NULL) {
6556                 /* error */
6557                 if (outchain)
6558                         sctp_m_freem(outchain);
6559                 return (NULL);
6560         }
6561         if (outchain) {
6562                 /* tack on to the end */
6563                 if (*endofchain != NULL) {
6564                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6565                 } else {
6566                         m = outchain;
6567                         while (m) {
6568                                 if (SCTP_BUF_NEXT(m) == NULL) {
6569                                         SCTP_BUF_NEXT(m) = appendchain;
6570                                         break;
6571                                 }
6572                                 m = SCTP_BUF_NEXT(m);
6573                         }
6574                 }
6575                 /*
6576                  * save off the end and update the end-chain position
6577                  */
6578                 m = appendchain;
6579                 while (m) {
6580                         if (SCTP_BUF_NEXT(m) == NULL) {
6581                                 *endofchain = m;
6582                                 break;
6583                         }
6584                         m = SCTP_BUF_NEXT(m);
6585                 }
6586                 return (outchain);
6587         } else {
6588                 /* save off the end and update the end-chain position */
6589                 m = appendchain;
6590                 while (m) {
6591                         if (SCTP_BUF_NEXT(m) == NULL) {
6592                                 *endofchain = m;
6593                                 break;
6594                         }
6595                         m = SCTP_BUF_NEXT(m);
6596                 }
6597                 return (appendchain);
6598         }
6599 }
6600
6601 static int
6602 sctp_med_chunk_output(struct sctp_inpcb *inp,
6603     struct sctp_tcb *stcb,
6604     struct sctp_association *asoc,
6605     int *num_out,
6606     int *reason_code,
6607     int control_only, int from_where,
6608     struct timeval *now, int *now_filled, int frag_point, int so_locked
6609 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6610     SCTP_UNUSED
6611 #endif
6612 );
6613
6614 static void
6615 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6616     uint32_t val SCTP_UNUSED)
6617 {
6618         struct sctp_copy_all *ca;
6619         struct mbuf *m;
6620         int ret = 0;
6621         int added_control = 0;
6622         int un_sent, do_chunk_output = 1;
6623         struct sctp_association *asoc;
6624         struct sctp_nets *net;
6625
6626         ca = (struct sctp_copy_all *)ptr;
6627         if (ca->m == NULL) {
6628                 return;
6629         }
6630         if (ca->inp != inp) {
6631                 /* TSNH */
6632                 return;
6633         }
6634         if (ca->sndlen > 0) {
6635                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6636                 if (m == NULL) {
6637                         /* can't copy so we are done */
6638                         ca->cnt_failed++;
6639                         return;
6640                 }
6641 #ifdef SCTP_MBUF_LOGGING
6642                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6643                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6644                 }
6645 #endif
6646         } else {
6647                 m = NULL;
6648         }
6649         SCTP_TCB_LOCK_ASSERT(stcb);
6650         if (stcb->asoc.alternate) {
6651                 net = stcb->asoc.alternate;
6652         } else {
6653                 net = stcb->asoc.primary_destination;
6654         }
6655         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6656                 /* Abort this assoc with m as the user defined reason */
6657                 if (m != NULL) {
6658                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6659                 } else {
6660                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6661                             0, M_NOWAIT, 1, MT_DATA);
6662                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6663                 }
6664                 if (m != NULL) {
6665                         struct sctp_paramhdr *ph;
6666
6667                         ph = mtod(m, struct sctp_paramhdr *);
6668                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6669                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6670                 }
6671                 /*
6672                  * We add one here to keep the assoc from dis-appearing on
6673                  * us.
6674                  */
6675                 atomic_add_int(&stcb->asoc.refcnt, 1);
6676                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6677                 /*
6678                  * sctp_abort_an_association calls sctp_free_asoc() free
6679                  * association will NOT free it since we incremented the
6680                  * refcnt .. we do this to prevent it being freed and things
6681                  * getting tricky since we could end up (from free_asoc)
6682                  * calling inpcb_free which would get a recursive lock call
6683                  * to the iterator lock.. But as a consequence of that the
6684                  * stcb will return to us un-locked.. since free_asoc
6685                  * returns with either no TCB or the TCB unlocked, we must
6686                  * relock.. to unlock in the iterator timer :-0
6687                  */
6688                 SCTP_TCB_LOCK(stcb);
6689                 atomic_add_int(&stcb->asoc.refcnt, -1);
6690                 goto no_chunk_output;
6691         } else {
6692                 if (m) {
6693                         ret = sctp_msg_append(stcb, net, m,
6694                             &ca->sndrcv, 1);
6695                 }
6696                 asoc = &stcb->asoc;
6697                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6698                         /* shutdown this assoc */
6699                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6700                             TAILQ_EMPTY(&asoc->sent_queue) &&
6701                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6702                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6703                                         goto abort_anyway;
6704                                 }
6705                                 /*
6706                                  * there is nothing queued to send, so I'm
6707                                  * done...
6708                                  */
6709                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6710                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6711                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6712                                         /*
6713                                          * only send SHUTDOWN the first time
6714                                          * through
6715                                          */
6716                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6717                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6718                                         }
6719                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6720                                         sctp_stop_timers_for_shutdown(stcb);
6721                                         sctp_send_shutdown(stcb, net);
6722                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6723                                             net);
6724                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6725                                             asoc->primary_destination);
6726                                         added_control = 1;
6727                                         do_chunk_output = 0;
6728                                 }
6729                         } else {
6730                                 /*
6731                                  * we still got (or just got) data to send,
6732                                  * so set SHUTDOWN_PENDING
6733                                  */
6734                                 /*
6735                                  * XXX sockets draft says that SCTP_EOF
6736                                  * should be sent with no data.  currently,
6737                                  * we will allow user data to be sent first
6738                                  * and move to SHUTDOWN-PENDING
6739                                  */
6740                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6741                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6742                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6743                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6744                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6745                                         }
6746                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6747                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6748                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6749                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6750                                                 struct mbuf *op_err;
6751                                                 char msg[SCTP_DIAG_INFO_LEN];
6752
6753                                 abort_anyway:
6754                                                 snprintf(msg, sizeof(msg),
6755                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6756                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6757                                                     msg);
6758                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6759                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6760                                                     op_err, SCTP_SO_NOT_LOCKED);
6761                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6762                                                 goto no_chunk_output;
6763                                         }
6764                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6765                                             asoc->primary_destination);
6766                                 }
6767                         }
6768
6769                 }
6770         }
6771         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6772             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6773
6774         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6775             (stcb->asoc.total_flight > 0) &&
6776             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6777                 do_chunk_output = 0;
6778         }
6779         if (do_chunk_output)
6780                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6781         else if (added_control) {
6782                 int num_out, reason, now_filled = 0;
6783                 struct timeval now;
6784                 int frag_point;
6785
6786                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6787                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6788                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6789         }
6790 no_chunk_output:
6791         if (ret) {
6792                 ca->cnt_failed++;
6793         } else {
6794                 ca->cnt_sent++;
6795         }
6796 }
6797
6798 static void
6799 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6800 {
6801         struct sctp_copy_all *ca;
6802
6803         ca = (struct sctp_copy_all *)ptr;
6804         /*
6805          * Do a notify here? Kacheong suggests that the notify be done at
6806          * the send time.. so you would push up a notification if any send
6807          * failed. Don't know if this is feasible since the only failures we
6808          * have is "memory" related and if you cannot get an mbuf to send
6809          * the data you surely can't get an mbuf to send up to notify the
6810          * user you can't send the data :->
6811          */
6812
6813         /* now free everything */
6814         if (ca->inp) {
6815                 /* Lets clear the flag to allow others to run. */
6816                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6817         }
6818         sctp_m_freem(ca->m);
6819         SCTP_FREE(ca, SCTP_M_COPYAL);
6820 }
6821
6822 static struct mbuf *
6823 sctp_copy_out_all(struct uio *uio, ssize_t len)
6824 {
6825         struct mbuf *ret, *at;
6826         ssize_t left, willcpy, cancpy, error;
6827
6828         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6829         if (ret == NULL) {
6830                 /* TSNH */
6831                 return (NULL);
6832         }
6833         left = len;
6834         SCTP_BUF_LEN(ret) = 0;
6835         /* save space for the data chunk header */
6836         cancpy = (int)M_TRAILINGSPACE(ret);
6837         willcpy = min(cancpy, left);
6838         at = ret;
6839         while (left > 0) {
6840                 /* Align data to the end */
6841                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6842                 if (error) {
6843         err_out_now:
6844                         sctp_m_freem(at);
6845                         return (NULL);
6846                 }
6847                 SCTP_BUF_LEN(at) = (int)willcpy;
6848                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6849                 left -= willcpy;
6850                 if (left > 0) {
6851                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6852                         if (SCTP_BUF_NEXT(at) == NULL) {
6853                                 goto err_out_now;
6854                         }
6855                         at = SCTP_BUF_NEXT(at);
6856                         SCTP_BUF_LEN(at) = 0;
6857                         cancpy = (int)M_TRAILINGSPACE(at);
6858                         willcpy = min(cancpy, left);
6859                 }
6860         }
6861         return (ret);
6862 }
6863
6864 static int
6865 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6866     struct sctp_sndrcvinfo *srcv)
6867 {
6868         int ret;
6869         struct sctp_copy_all *ca;
6870
6871         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6872                 /* There is another. */
6873                 return (EBUSY);
6874         }
6875         if (uio->uio_resid > SCTP_MAX_SENDALL_LIMIT) {
6876                 /* You must be less than the max! */
6877                 return (EMSGSIZE);
6878         }
6879         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6880             SCTP_M_COPYAL);
6881         if (ca == NULL) {
6882                 sctp_m_freem(m);
6883                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6884                 return (ENOMEM);
6885         }
6886         memset(ca, 0, sizeof(struct sctp_copy_all));
6887
6888         ca->inp = inp;
6889         if (srcv) {
6890                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6891         }
6892         /*
6893          * take off the sendall flag, it would be bad if we failed to do
6894          * this :-0
6895          */
6896         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6897         /* get length and mbuf chain */
6898         if (uio) {
6899                 ca->sndlen = uio->uio_resid;
6900                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6901                 if (ca->m == NULL) {
6902                         SCTP_FREE(ca, SCTP_M_COPYAL);
6903                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6904                         return (ENOMEM);
6905                 }
6906         } else {
6907                 /* Gather the length of the send */
6908                 struct mbuf *mat;
6909
6910                 ca->sndlen = 0;
6911                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6912                         ca->sndlen += SCTP_BUF_LEN(mat);
6913                 }
6914         }
6915         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6916         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6917             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6918             SCTP_ASOC_ANY_STATE,
6919             (void *)ca, 0,
6920             sctp_sendall_completes, inp, 1);
6921         if (ret) {
6922                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6923                 SCTP_FREE(ca, SCTP_M_COPYAL);
6924                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6925                 return (EFAULT);
6926         }
6927         return (0);
6928 }
6929
6930
6931 void
6932 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6933 {
6934         struct sctp_tmit_chunk *chk, *nchk;
6935
6936         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6937                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6938                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6939                         asoc->ctrl_queue_cnt--;
6940                         if (chk->data) {
6941                                 sctp_m_freem(chk->data);
6942                                 chk->data = NULL;
6943                         }
6944                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6945                 }
6946         }
6947 }
6948
6949 void
6950 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6951 {
6952         struct sctp_association *asoc;
6953         struct sctp_tmit_chunk *chk, *nchk;
6954         struct sctp_asconf_chunk *acp;
6955
6956         asoc = &stcb->asoc;
6957         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6958                 /* find SCTP_ASCONF chunk in queue */
6959                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6960                         if (chk->data) {
6961                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6962                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6963                                         /* Not Acked yet */
6964                                         break;
6965                                 }
6966                         }
6967                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6968                         asoc->ctrl_queue_cnt--;
6969                         if (chk->data) {
6970                                 sctp_m_freem(chk->data);
6971                                 chk->data = NULL;
6972                         }
6973                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6974                 }
6975         }
6976 }
6977
6978
6979 static void
6980 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6981     struct sctp_association *asoc,
6982     struct sctp_tmit_chunk **data_list,
6983     int bundle_at,
6984     struct sctp_nets *net)
6985 {
6986         int i;
6987         struct sctp_tmit_chunk *tp1;
6988
6989         for (i = 0; i < bundle_at; i++) {
6990                 /* off of the send queue */
6991                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6992                 asoc->send_queue_cnt--;
6993                 if (i > 0) {
6994                         /*
6995                          * Any chunk NOT 0 you zap the time chunk 0 gets
6996                          * zapped or set based on if a RTO measurment is
6997                          * needed.
6998                          */
6999                         data_list[i]->do_rtt = 0;
7000                 }
7001                 /* record time */
7002                 data_list[i]->sent_rcv_time = net->last_sent_time;
7003                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
7004                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
7005                 if (data_list[i]->whoTo == NULL) {
7006                         data_list[i]->whoTo = net;
7007                         atomic_add_int(&net->ref_count, 1);
7008                 }
7009                 /* on to the sent queue */
7010                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7011                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7012                         struct sctp_tmit_chunk *tpp;
7013
7014                         /* need to move back */
7015         back_up_more:
7016                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7017                         if (tpp == NULL) {
7018                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7019                                 goto all_done;
7020                         }
7021                         tp1 = tpp;
7022                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7023                                 goto back_up_more;
7024                         }
7025                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7026                 } else {
7027                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7028                             data_list[i],
7029                             sctp_next);
7030                 }
7031 all_done:
7032                 /* This does not lower until the cum-ack passes it */
7033                 asoc->sent_queue_cnt++;
7034                 if ((asoc->peers_rwnd <= 0) &&
7035                     (asoc->total_flight == 0) &&
7036                     (bundle_at == 1)) {
7037                         /* Mark the chunk as being a window probe */
7038                         SCTP_STAT_INCR(sctps_windowprobed);
7039                 }
7040 #ifdef SCTP_AUDITING_ENABLED
7041                 sctp_audit_log(0xC2, 3);
7042 #endif
7043                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7044                 data_list[i]->snd_count = 1;
7045                 data_list[i]->rec.data.chunk_was_revoked = 0;
7046                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7047                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7048                             data_list[i]->whoTo->flight_size,
7049                             data_list[i]->book_size,
7050                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7051                             data_list[i]->rec.data.tsn);
7052                 }
7053                 sctp_flight_size_increase(data_list[i]);
7054                 sctp_total_flight_increase(stcb, data_list[i]);
7055                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7056                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7057                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7058                 }
7059                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7060                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7061                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7062                         /* SWS sender side engages */
7063                         asoc->peers_rwnd = 0;
7064                 }
7065         }
7066         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7067                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7068         }
7069 }
7070
7071 static void
7072 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7073 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7074     SCTP_UNUSED
7075 #endif
7076 )
7077 {
7078         struct sctp_tmit_chunk *chk, *nchk;
7079
7080         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7081                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7082                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7083                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7084                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7085                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7086                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7087                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7088                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7089                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7090                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7091                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7092                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7093                         /* Stray chunks must be cleaned up */
7094         clean_up_anyway:
7095                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7096                         asoc->ctrl_queue_cnt--;
7097                         if (chk->data) {
7098                                 sctp_m_freem(chk->data);
7099                                 chk->data = NULL;
7100                         }
7101                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7102                                 asoc->fwd_tsn_cnt--;
7103                         }
7104                         sctp_free_a_chunk(stcb, chk, so_locked);
7105                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7106                         /* special handling, we must look into the param */
7107                         if (chk != asoc->str_reset) {
7108                                 goto clean_up_anyway;
7109                         }
7110                 }
7111         }
7112 }
7113
7114 static uint32_t
7115 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7116     uint32_t space_left, uint32_t frag_point, int eeor_on)
7117 {
7118         /*
7119          * Make a decision on if I should split a msg into multiple parts.
7120          * This is only asked of incomplete messages.
7121          */
7122         if (eeor_on) {
7123                 /*
7124                  * If we are doing EEOR we need to always send it if its the
7125                  * entire thing, since it might be all the guy is putting in
7126                  * the hopper.
7127                  */
7128                 if (space_left >= length) {
7129                         /*-
7130                          * If we have data outstanding,
7131                          * we get another chance when the sack
7132                          * arrives to transmit - wait for more data
7133                          */
7134                         if (stcb->asoc.total_flight == 0) {
7135                                 /*
7136                                  * If nothing is in flight, we zero the
7137                                  * packet counter.
7138                                  */
7139                                 return (length);
7140                         }
7141                         return (0);
7142
7143                 } else {
7144                         /* You can fill the rest */
7145                         return (space_left);
7146                 }
7147         }
7148         /*-
7149          * For those strange folk that make the send buffer
7150          * smaller than our fragmentation point, we can't
7151          * get a full msg in so we have to allow splitting.
7152          */
7153         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7154                 return (length);
7155         }
7156         if ((length <= space_left) ||
7157             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7158                 /* Sub-optimial residual don't split in non-eeor mode. */
7159                 return (0);
7160         }
7161         /*
7162          * If we reach here length is larger than the space_left. Do we wish
7163          * to split it for the sake of packet putting together?
7164          */
7165         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7166                 /* Its ok to split it */
7167                 return (min(space_left, frag_point));
7168         }
7169         /* Nope, can't split */
7170         return (0);
7171 }
7172
7173 static uint32_t
7174 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7175     struct sctp_stream_out *strq,
7176     uint32_t space_left,
7177     uint32_t frag_point,
7178     int *giveup,
7179     int eeor_mode,
7180     int *bail,
7181     int so_locked
7182 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7183     SCTP_UNUSED
7184 #endif
7185 )
7186 {
7187         /* Move from the stream to the send_queue keeping track of the total */
7188         struct sctp_association *asoc;
7189         struct sctp_stream_queue_pending *sp;
7190         struct sctp_tmit_chunk *chk;
7191         struct sctp_data_chunk *dchkh = NULL;
7192         struct sctp_idata_chunk *ndchkh = NULL;
7193         uint32_t to_move, length;
7194         int leading;
7195         uint8_t rcv_flags = 0;
7196         uint8_t some_taken;
7197         uint8_t send_lock_up = 0;
7198
7199         SCTP_TCB_LOCK_ASSERT(stcb);
7200         asoc = &stcb->asoc;
7201 one_more_time:
7202         /* sa_ignore FREED_MEMORY */
7203         sp = TAILQ_FIRST(&strq->outqueue);
7204         if (sp == NULL) {
7205                 if (send_lock_up == 0) {
7206                         SCTP_TCB_SEND_LOCK(stcb);
7207                         send_lock_up = 1;
7208                 }
7209                 sp = TAILQ_FIRST(&strq->outqueue);
7210                 if (sp) {
7211                         goto one_more_time;
7212                 }
7213                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7214                     (stcb->asoc.idata_supported == 0) &&
7215                     (strq->last_msg_incomplete)) {
7216                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7217                             strq->sid,
7218                             strq->last_msg_incomplete);
7219                         strq->last_msg_incomplete = 0;
7220                 }
7221                 to_move = 0;
7222                 if (send_lock_up) {
7223                         SCTP_TCB_SEND_UNLOCK(stcb);
7224                         send_lock_up = 0;
7225                 }
7226                 goto out_of;
7227         }
7228         if ((sp->msg_is_complete) && (sp->length == 0)) {
7229                 if (sp->sender_all_done) {
7230                         /*
7231                          * We are doing deferred cleanup. Last time through
7232                          * when we took all the data the sender_all_done was
7233                          * not set.
7234                          */
7235                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7236                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7237                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7238                                     sp->sender_all_done,
7239                                     sp->length,
7240                                     sp->msg_is_complete,
7241                                     sp->put_last_out,
7242                                     send_lock_up);
7243                         }
7244                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7245                                 SCTP_TCB_SEND_LOCK(stcb);
7246                                 send_lock_up = 1;
7247                         }
7248                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7249                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7250                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7251                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7252                             (strq->chunks_on_queues == 0) &&
7253                             TAILQ_EMPTY(&strq->outqueue)) {
7254                                 stcb->asoc.trigger_reset = 1;
7255                         }
7256                         if (sp->net) {
7257                                 sctp_free_remote_addr(sp->net);
7258                                 sp->net = NULL;
7259                         }
7260                         if (sp->data) {
7261                                 sctp_m_freem(sp->data);
7262                                 sp->data = NULL;
7263                         }
7264                         sctp_free_a_strmoq(stcb, sp, so_locked);
7265                         /* we can't be locked to it */
7266                         if (send_lock_up) {
7267                                 SCTP_TCB_SEND_UNLOCK(stcb);
7268                                 send_lock_up = 0;
7269                         }
7270                         /* back to get the next msg */
7271                         goto one_more_time;
7272                 } else {
7273                         /*
7274                          * sender just finished this but still holds a
7275                          * reference
7276                          */
7277                         *giveup = 1;
7278                         to_move = 0;
7279                         goto out_of;
7280                 }
7281         } else {
7282                 /* is there some to get */
7283                 if (sp->length == 0) {
7284                         /* no */
7285                         *giveup = 1;
7286                         to_move = 0;
7287                         goto out_of;
7288                 } else if (sp->discard_rest) {
7289                         if (send_lock_up == 0) {
7290                                 SCTP_TCB_SEND_LOCK(stcb);
7291                                 send_lock_up = 1;
7292                         }
7293                         /* Whack down the size */
7294                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7295                         if ((stcb->sctp_socket != NULL) &&
7296                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7297                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7298                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7299                         }
7300                         if (sp->data) {
7301                                 sctp_m_freem(sp->data);
7302                                 sp->data = NULL;
7303                                 sp->tail_mbuf = NULL;
7304                         }
7305                         sp->length = 0;
7306                         sp->some_taken = 1;
7307                         *giveup = 1;
7308                         to_move = 0;
7309                         goto out_of;
7310                 }
7311         }
7312         some_taken = sp->some_taken;
7313 re_look:
7314         length = sp->length;
7315         if (sp->msg_is_complete) {
7316                 /* The message is complete */
7317                 to_move = min(length, frag_point);
7318                 if (to_move == length) {
7319                         /* All of it fits in the MTU */
7320                         if (sp->some_taken) {
7321                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7322                         } else {
7323                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7324                         }
7325                         sp->put_last_out = 1;
7326                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7327                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7328                         }
7329                 } else {
7330                         /* Not all of it fits, we fragment */
7331                         if (sp->some_taken == 0) {
7332                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7333                         }
7334                         sp->some_taken = 1;
7335                 }
7336         } else {
7337                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7338                 if (to_move) {
7339                         /*-
7340                          * We use a snapshot of length in case it
7341                          * is expanding during the compare.
7342                          */
7343                         uint32_t llen;
7344
7345                         llen = length;
7346                         if (to_move >= llen) {
7347                                 to_move = llen;
7348                                 if (send_lock_up == 0) {
7349                                         /*-
7350                                          * We are taking all of an incomplete msg
7351                                          * thus we need a send lock.
7352                                          */
7353                                         SCTP_TCB_SEND_LOCK(stcb);
7354                                         send_lock_up = 1;
7355                                         if (sp->msg_is_complete) {
7356                                                 /*
7357                                                  * the sender finished the
7358                                                  * msg
7359                                                  */
7360                                                 goto re_look;
7361                                         }
7362                                 }
7363                         }
7364                         if (sp->some_taken == 0) {
7365                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7366                                 sp->some_taken = 1;
7367                         }
7368                 } else {
7369                         /* Nothing to take. */
7370                         *giveup = 1;
7371                         to_move = 0;
7372                         goto out_of;
7373                 }
7374         }
7375
7376         /* If we reach here, we can copy out a chunk */
7377         sctp_alloc_a_chunk(stcb, chk);
7378         if (chk == NULL) {
7379                 /* No chunk memory */
7380                 *giveup = 1;
7381                 to_move = 0;
7382                 goto out_of;
7383         }
7384         /*
7385          * Setup for unordered if needed by looking at the user sent info
7386          * flags.
7387          */
7388         if (sp->sinfo_flags & SCTP_UNORDERED) {
7389                 rcv_flags |= SCTP_DATA_UNORDERED;
7390         }
7391         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7392             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7393                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7394         }
7395         /* clear out the chunk before setting up */
7396         memset(chk, 0, sizeof(*chk));
7397         chk->rec.data.rcv_flags = rcv_flags;
7398
7399         if (to_move >= length) {
7400                 /* we think we can steal the whole thing */
7401                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7402                         SCTP_TCB_SEND_LOCK(stcb);
7403                         send_lock_up = 1;
7404                 }
7405                 if (to_move < sp->length) {
7406                         /* bail, it changed */
7407                         goto dont_do_it;
7408                 }
7409                 chk->data = sp->data;
7410                 chk->last_mbuf = sp->tail_mbuf;
7411                 /* register the stealing */
7412                 sp->data = sp->tail_mbuf = NULL;
7413         } else {
7414                 struct mbuf *m;
7415
7416 dont_do_it:
7417                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7418                 chk->last_mbuf = NULL;
7419                 if (chk->data == NULL) {
7420                         sp->some_taken = some_taken;
7421                         sctp_free_a_chunk(stcb, chk, so_locked);
7422                         *bail = 1;
7423                         to_move = 0;
7424                         goto out_of;
7425                 }
7426 #ifdef SCTP_MBUF_LOGGING
7427                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7428                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7429                 }
7430 #endif
7431                 /* Pull off the data */
7432                 m_adj(sp->data, to_move);
7433                 /* Now lets work our way down and compact it */
7434                 m = sp->data;
7435                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7436                         sp->data = SCTP_BUF_NEXT(m);
7437                         SCTP_BUF_NEXT(m) = NULL;
7438                         if (sp->tail_mbuf == m) {
7439                                 /*-
7440                                  * Freeing tail? TSNH since
7441                                  * we supposedly were taking less
7442                                  * than the sp->length.
7443                                  */
7444 #ifdef INVARIANTS
7445                                 panic("Huh, freing tail? - TSNH");
7446 #else
7447                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7448                                 sp->tail_mbuf = sp->data = NULL;
7449                                 sp->length = 0;
7450 #endif
7451
7452                         }
7453                         sctp_m_free(m);
7454                         m = sp->data;
7455                 }
7456         }
7457         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7458                 chk->copy_by_ref = 1;
7459         } else {
7460                 chk->copy_by_ref = 0;
7461         }
7462         /*
7463          * get last_mbuf and counts of mb usage This is ugly but hopefully
7464          * its only one mbuf.
7465          */
7466         if (chk->last_mbuf == NULL) {
7467                 chk->last_mbuf = chk->data;
7468                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7469                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7470                 }
7471         }
7472
7473         if (to_move > length) {
7474                 /*- This should not happen either
7475                  * since we always lower to_move to the size
7476                  * of sp->length if its larger.
7477                  */
7478 #ifdef INVARIANTS
7479                 panic("Huh, how can to_move be larger?");
7480 #else
7481                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7482                 sp->length = 0;
7483 #endif
7484         } else {
7485                 atomic_subtract_int(&sp->length, to_move);
7486         }
7487         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7488         if (M_LEADINGSPACE(chk->data) < leading) {
7489                 /* Not enough room for a chunk header, get some */
7490                 struct mbuf *m;
7491
7492                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7493                 if (m == NULL) {
7494                         /*
7495                          * we're in trouble here. _PREPEND below will free
7496                          * all the data if there is no leading space, so we
7497                          * must put the data back and restore.
7498                          */
7499                         if (send_lock_up == 0) {
7500                                 SCTP_TCB_SEND_LOCK(stcb);
7501                                 send_lock_up = 1;
7502                         }
7503                         if (sp->data == NULL) {
7504                                 /* unsteal the data */
7505                                 sp->data = chk->data;
7506                                 sp->tail_mbuf = chk->last_mbuf;
7507                         } else {
7508                                 struct mbuf *m_tmp;
7509
7510                                 /* reassemble the data */
7511                                 m_tmp = sp->data;
7512                                 sp->data = chk->data;
7513                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7514                         }
7515                         sp->some_taken = some_taken;
7516                         atomic_add_int(&sp->length, to_move);
7517                         chk->data = NULL;
7518                         *bail = 1;
7519                         sctp_free_a_chunk(stcb, chk, so_locked);
7520                         to_move = 0;
7521                         goto out_of;
7522                 } else {
7523                         SCTP_BUF_LEN(m) = 0;
7524                         SCTP_BUF_NEXT(m) = chk->data;
7525                         chk->data = m;
7526                         M_ALIGN(chk->data, 4);
7527                 }
7528         }
7529         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7530         if (chk->data == NULL) {
7531                 /* HELP, TSNH since we assured it would not above? */
7532 #ifdef INVARIANTS
7533                 panic("prepend failes HELP?");
7534 #else
7535                 SCTP_PRINTF("prepend fails HELP?\n");
7536                 sctp_free_a_chunk(stcb, chk, so_locked);
7537 #endif
7538                 *bail = 1;
7539                 to_move = 0;
7540                 goto out_of;
7541         }
7542         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7543         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7544         chk->book_size_scale = 0;
7545         chk->sent = SCTP_DATAGRAM_UNSENT;
7546
7547         chk->flags = 0;
7548         chk->asoc = &stcb->asoc;
7549         chk->pad_inplace = 0;
7550         chk->no_fr_allowed = 0;
7551         if (stcb->asoc.idata_supported == 0) {
7552                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7553                         /* Just use 0. The receiver ignores the values. */
7554                         chk->rec.data.mid = 0;
7555                 } else {
7556                         chk->rec.data.mid = strq->next_mid_ordered;
7557                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7558                                 strq->next_mid_ordered++;
7559                         }
7560                 }
7561         } else {
7562                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7563                         chk->rec.data.mid = strq->next_mid_unordered;
7564                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7565                                 strq->next_mid_unordered++;
7566                         }
7567                 } else {
7568                         chk->rec.data.mid = strq->next_mid_ordered;
7569                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7570                                 strq->next_mid_ordered++;
7571                         }
7572                 }
7573         }
7574         chk->rec.data.sid = sp->sid;
7575         chk->rec.data.ppid = sp->ppid;
7576         chk->rec.data.context = sp->context;
7577         chk->rec.data.doing_fast_retransmit = 0;
7578
7579         chk->rec.data.timetodrop = sp->ts;
7580         chk->flags = sp->act_flags;
7581
7582         if (sp->net) {
7583                 chk->whoTo = sp->net;
7584                 atomic_add_int(&chk->whoTo->ref_count, 1);
7585         } else
7586                 chk->whoTo = NULL;
7587
7588         if (sp->holds_key_ref) {
7589                 chk->auth_keyid = sp->auth_keyid;
7590                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7591                 chk->holds_key_ref = 1;
7592         }
7593         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7594         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7595                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7596                     (uint32_t)(uintptr_t)stcb, sp->length,
7597                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7598                     chk->rec.data.tsn);
7599         }
7600         if (stcb->asoc.idata_supported == 0) {
7601                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7602         } else {
7603                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7604         }
7605         /*
7606          * Put the rest of the things in place now. Size was done earlier in
7607          * previous loop prior to padding.
7608          */
7609
7610 #ifdef SCTP_ASOCLOG_OF_TSNS
7611         SCTP_TCB_LOCK_ASSERT(stcb);
7612         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7613                 asoc->tsn_out_at = 0;
7614                 asoc->tsn_out_wrapped = 1;
7615         }
7616         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7617         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7618         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7619         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7620         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7621         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7622         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7623         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7624         asoc->tsn_out_at++;
7625 #endif
7626         if (stcb->asoc.idata_supported == 0) {
7627                 dchkh->ch.chunk_type = SCTP_DATA;
7628                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7629                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7630                 dchkh->dp.sid = htons(strq->sid);
7631                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7632                 dchkh->dp.ppid = chk->rec.data.ppid;
7633                 dchkh->ch.chunk_length = htons(chk->send_size);
7634         } else {
7635                 ndchkh->ch.chunk_type = SCTP_IDATA;
7636                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7637                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7638                 ndchkh->dp.sid = htons(strq->sid);
7639                 ndchkh->dp.reserved = htons(0);
7640                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7641                 if (sp->fsn == 0)
7642                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7643                 else
7644                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7645                 sp->fsn++;
7646                 ndchkh->ch.chunk_length = htons(chk->send_size);
7647         }
7648         /* Now advance the chk->send_size by the actual pad needed. */
7649         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7650                 /* need a pad */
7651                 struct mbuf *lm;
7652                 int pads;
7653
7654                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7655                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7656                 if (lm != NULL) {
7657                         chk->last_mbuf = lm;
7658                         chk->pad_inplace = 1;
7659                 }
7660                 chk->send_size += pads;
7661         }
7662         if (PR_SCTP_ENABLED(chk->flags)) {
7663                 asoc->pr_sctp_cnt++;
7664         }
7665         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7666                 /* All done pull and kill the message */
7667                 if (sp->put_last_out == 0) {
7668                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7669                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7670                             sp->sender_all_done,
7671                             sp->length,
7672                             sp->msg_is_complete,
7673                             sp->put_last_out,
7674                             send_lock_up);
7675                 }
7676                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7677                         SCTP_TCB_SEND_LOCK(stcb);
7678                         send_lock_up = 1;
7679                 }
7680                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7681                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7682                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7683                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7684                     (strq->chunks_on_queues == 0) &&
7685                     TAILQ_EMPTY(&strq->outqueue)) {
7686                         stcb->asoc.trigger_reset = 1;
7687                 }
7688                 if (sp->net) {
7689                         sctp_free_remote_addr(sp->net);
7690                         sp->net = NULL;
7691                 }
7692                 if (sp->data) {
7693                         sctp_m_freem(sp->data);
7694                         sp->data = NULL;
7695                 }
7696                 sctp_free_a_strmoq(stcb, sp, so_locked);
7697         }
7698         asoc->chunks_on_out_queue++;
7699         strq->chunks_on_queues++;
7700         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7701         asoc->send_queue_cnt++;
7702 out_of:
7703         if (send_lock_up) {
7704                 SCTP_TCB_SEND_UNLOCK(stcb);
7705         }
7706         return (to_move);
7707 }
7708
7709
7710 static void
7711 sctp_fill_outqueue(struct sctp_tcb *stcb,
7712     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7713 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7714     SCTP_UNUSED
7715 #endif
7716 )
7717 {
7718         struct sctp_association *asoc;
7719         struct sctp_stream_out *strq;
7720         uint32_t space_left, moved, total_moved;
7721         int bail, giveup;
7722
7723         SCTP_TCB_LOCK_ASSERT(stcb);
7724         asoc = &stcb->asoc;
7725         total_moved = 0;
7726         switch (net->ro._l_addr.sa.sa_family) {
7727 #ifdef INET
7728         case AF_INET:
7729                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7730                 break;
7731 #endif
7732 #ifdef INET6
7733         case AF_INET6:
7734                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7735                 break;
7736 #endif
7737         default:
7738                 /* TSNH */
7739                 space_left = net->mtu;
7740                 break;
7741         }
7742         /* Need an allowance for the data chunk header too */
7743         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7744
7745         /* must make even word boundary */
7746         space_left &= 0xfffffffc;
7747         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7748         giveup = 0;
7749         bail = 0;
7750         while ((space_left > 0) && (strq != NULL)) {
7751                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7752                     &giveup, eeor_mode, &bail, so_locked);
7753                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7754                 if ((giveup != 0) || (bail != 0)) {
7755                         break;
7756                 }
7757                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7758                 total_moved += moved;
7759                 space_left -= moved;
7760                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7761                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7762                 } else {
7763                         space_left = 0;
7764                 }
7765                 space_left &= 0xfffffffc;
7766         }
7767         if (bail != 0)
7768                 *quit_now = 1;
7769
7770         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7771
7772         if (total_moved == 0) {
7773                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7774                     (net == stcb->asoc.primary_destination)) {
7775                         /* ran dry for primary network net */
7776                         SCTP_STAT_INCR(sctps_primary_randry);
7777                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7778                         /* ran dry with CMT on */
7779                         SCTP_STAT_INCR(sctps_cmt_randry);
7780                 }
7781         }
7782 }
7783
7784 void
7785 sctp_fix_ecn_echo(struct sctp_association *asoc)
7786 {
7787         struct sctp_tmit_chunk *chk;
7788
7789         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7790                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7791                         chk->sent = SCTP_DATAGRAM_UNSENT;
7792                 }
7793         }
7794 }
7795
7796 void
7797 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7798 {
7799         struct sctp_association *asoc;
7800         struct sctp_tmit_chunk *chk;
7801         struct sctp_stream_queue_pending *sp;
7802         unsigned int i;
7803
7804         if (net == NULL) {
7805                 return;
7806         }
7807         asoc = &stcb->asoc;
7808         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7809                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7810                         if (sp->net == net) {
7811                                 sctp_free_remote_addr(sp->net);
7812                                 sp->net = NULL;
7813                         }
7814                 }
7815         }
7816         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7817                 if (chk->whoTo == net) {
7818                         sctp_free_remote_addr(chk->whoTo);
7819                         chk->whoTo = NULL;
7820                 }
7821         }
7822 }
7823
7824 int
7825 sctp_med_chunk_output(struct sctp_inpcb *inp,
7826     struct sctp_tcb *stcb,
7827     struct sctp_association *asoc,
7828     int *num_out,
7829     int *reason_code,
7830     int control_only, int from_where,
7831     struct timeval *now, int *now_filled, int frag_point, int so_locked
7832 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7833     SCTP_UNUSED
7834 #endif
7835 )
7836 {
7837         /**
7838          * Ok this is the generic chunk service queue. we must do the
7839          * following:
7840          * - Service the stream queue that is next, moving any
7841          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7842          *   LAST to the out queue in one pass) and assigning TSN's. This
7843          *   only applys though if the peer does not support NDATA. For NDATA
7844          *   chunks its ok to not send the entire message ;-)
7845          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7846          *   fomulate and send the low level chunks. Making sure to combine
7847          *   any control in the control chunk queue also.
7848          */
7849         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7850         struct mbuf *outchain, *endoutchain;
7851         struct sctp_tmit_chunk *chk, *nchk;
7852
7853         /* temp arrays for unlinking */
7854         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7855         int no_fragmentflg, error;
7856         unsigned int max_rwnd_per_dest, max_send_per_dest;
7857         int one_chunk, hbflag, skip_data_for_this_net;
7858         int asconf, cookie, no_out_cnt;
7859         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7860         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7861         int tsns_sent = 0;
7862         uint32_t auth_offset = 0;
7863         struct sctp_auth_chunk *auth = NULL;
7864         uint16_t auth_keyid;
7865         int override_ok = 1;
7866         int skip_fill_up = 0;
7867         int data_auth_reqd = 0;
7868
7869         /*
7870          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7871          * destination.
7872          */
7873         int quit_now = 0;
7874
7875         *num_out = 0;
7876         *reason_code = 0;
7877         auth_keyid = stcb->asoc.authinfo.active_keyid;
7878         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7879             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7880             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7881                 eeor_mode = 1;
7882         } else {
7883                 eeor_mode = 0;
7884         }
7885         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7886         /*
7887          * First lets prime the pump. For each destination, if there is room
7888          * in the flight size, attempt to pull an MTU's worth out of the
7889          * stream queues into the general send_queue
7890          */
7891 #ifdef SCTP_AUDITING_ENABLED
7892         sctp_audit_log(0xC2, 2);
7893 #endif
7894         SCTP_TCB_LOCK_ASSERT(stcb);
7895         hbflag = 0;
7896         if (control_only)
7897                 no_data_chunks = 1;
7898         else
7899                 no_data_chunks = 0;
7900
7901         /* Nothing to possible to send? */
7902         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7903             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7904             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7905             TAILQ_EMPTY(&asoc->send_queue) &&
7906             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7907 nothing_to_send:
7908                 *reason_code = 9;
7909                 return (0);
7910         }
7911         if (asoc->peers_rwnd == 0) {
7912                 /* No room in peers rwnd */
7913                 *reason_code = 1;
7914                 if (asoc->total_flight > 0) {
7915                         /* we are allowed one chunk in flight */
7916                         no_data_chunks = 1;
7917                 }
7918         }
7919         if (stcb->asoc.ecn_echo_cnt_onq) {
7920                 /* Record where a sack goes, if any */
7921                 if (no_data_chunks &&
7922                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7923                         /* Nothing but ECNe to send - we don't do that */
7924                         goto nothing_to_send;
7925                 }
7926                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7927                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7928                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7929                                 sack_goes_to = chk->whoTo;
7930                                 break;
7931                         }
7932                 }
7933         }
7934         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7935         if (stcb->sctp_socket)
7936                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7937         else
7938                 max_send_per_dest = 0;
7939         if (no_data_chunks == 0) {
7940                 /* How many non-directed chunks are there? */
7941                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7942                         if (chk->whoTo == NULL) {
7943                                 /*
7944                                  * We already have non-directed chunks on
7945                                  * the queue, no need to do a fill-up.
7946                                  */
7947                                 skip_fill_up = 1;
7948                                 break;
7949                         }
7950                 }
7951
7952         }
7953         if ((no_data_chunks == 0) &&
7954             (skip_fill_up == 0) &&
7955             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7956                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7957                         /*
7958                          * This for loop we are in takes in each net, if
7959                          * its's got space in cwnd and has data sent to it
7960                          * (when CMT is off) then it calls
7961                          * sctp_fill_outqueue for the net. This gets data on
7962                          * the send queue for that network.
7963                          *
7964                          * In sctp_fill_outqueue TSN's are assigned and data
7965                          * is copied out of the stream buffers. Note mostly
7966                          * copy by reference (we hope).
7967                          */
7968                         net->window_probe = 0;
7969                         if ((net != stcb->asoc.alternate) &&
7970                             ((net->dest_state & SCTP_ADDR_PF) ||
7971                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7972                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7973                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7974                                         sctp_log_cwnd(stcb, net, 1,
7975                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7976                                 }
7977                                 continue;
7978                         }
7979                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7980                             (net->flight_size == 0)) {
7981                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7982                         }
7983                         if (net->flight_size >= net->cwnd) {
7984                                 /* skip this network, no room - can't fill */
7985                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7986                                         sctp_log_cwnd(stcb, net, 3,
7987                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7988                                 }
7989                                 continue;
7990                         }
7991                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7992                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7993                         }
7994                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7995                         if (quit_now) {
7996                                 /* memory alloc failure */
7997                                 no_data_chunks = 1;
7998                                 break;
7999                         }
8000                 }
8001         }
8002         /* now service each destination and send out what we can for it */
8003         /* Nothing to send? */
8004         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8005             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8006             TAILQ_EMPTY(&asoc->send_queue)) {
8007                 *reason_code = 8;
8008                 return (0);
8009         }
8010
8011         if (asoc->sctp_cmt_on_off > 0) {
8012                 /* get the last start point */
8013                 start_at = asoc->last_net_cmt_send_started;
8014                 if (start_at == NULL) {
8015                         /* null so to beginning */
8016                         start_at = TAILQ_FIRST(&asoc->nets);
8017                 } else {
8018                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8019                         if (start_at == NULL) {
8020                                 start_at = TAILQ_FIRST(&asoc->nets);
8021                         }
8022                 }
8023                 asoc->last_net_cmt_send_started = start_at;
8024         } else {
8025                 start_at = TAILQ_FIRST(&asoc->nets);
8026         }
8027         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8028                 if (chk->whoTo == NULL) {
8029                         if (asoc->alternate) {
8030                                 chk->whoTo = asoc->alternate;
8031                         } else {
8032                                 chk->whoTo = asoc->primary_destination;
8033                         }
8034                         atomic_add_int(&chk->whoTo->ref_count, 1);
8035                 }
8036         }
8037         old_start_at = NULL;
8038 again_one_more_time:
8039         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8040                 /* how much can we send? */
8041                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8042                 if (old_start_at && (old_start_at == net)) {
8043                         /* through list ocmpletely. */
8044                         break;
8045                 }
8046                 tsns_sent = 0xa;
8047                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8048                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8049                     (net->flight_size >= net->cwnd)) {
8050                         /*
8051                          * Nothing on control or asconf and flight is full,
8052                          * we can skip even in the CMT case.
8053                          */
8054                         continue;
8055                 }
8056                 bundle_at = 0;
8057                 endoutchain = outchain = NULL;
8058                 no_fragmentflg = 1;
8059                 one_chunk = 0;
8060                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8061                         skip_data_for_this_net = 1;
8062                 } else {
8063                         skip_data_for_this_net = 0;
8064                 }
8065                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8066 #ifdef INET
8067                 case AF_INET:
8068                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8069                         break;
8070 #endif
8071 #ifdef INET6
8072                 case AF_INET6:
8073                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8074                         break;
8075 #endif
8076                 default:
8077                         /* TSNH */
8078                         mtu = net->mtu;
8079                         break;
8080                 }
8081                 mx_mtu = mtu;
8082                 to_out = 0;
8083                 if (mtu > asoc->peers_rwnd) {
8084                         if (asoc->total_flight > 0) {
8085                                 /* We have a packet in flight somewhere */
8086                                 r_mtu = asoc->peers_rwnd;
8087                         } else {
8088                                 /* We are always allowed to send one MTU out */
8089                                 one_chunk = 1;
8090                                 r_mtu = mtu;
8091                         }
8092                 } else {
8093                         r_mtu = mtu;
8094                 }
8095                 error = 0;
8096                 /************************/
8097                 /* ASCONF transmission */
8098                 /************************/
8099                 /* Now first lets go through the asconf queue */
8100                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8101                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8102                                 continue;
8103                         }
8104                         if (chk->whoTo == NULL) {
8105                                 if (asoc->alternate == NULL) {
8106                                         if (asoc->primary_destination != net) {
8107                                                 break;
8108                                         }
8109                                 } else {
8110                                         if (asoc->alternate != net) {
8111                                                 break;
8112                                         }
8113                                 }
8114                         } else {
8115                                 if (chk->whoTo != net) {
8116                                         break;
8117                                 }
8118                         }
8119                         if (chk->data == NULL) {
8120                                 break;
8121                         }
8122                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8123                             chk->sent != SCTP_DATAGRAM_RESEND) {
8124                                 break;
8125                         }
8126                         /*
8127                          * if no AUTH is yet included and this chunk
8128                          * requires it, make sure to account for it.  We
8129                          * don't apply the size until the AUTH chunk is
8130                          * actually added below in case there is no room for
8131                          * this chunk. NOTE: we overload the use of "omtu"
8132                          * here
8133                          */
8134                         if ((auth == NULL) &&
8135                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8136                             stcb->asoc.peer_auth_chunks)) {
8137                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8138                         } else
8139                                 omtu = 0;
8140                         /* Here we do NOT factor the r_mtu */
8141                         if ((chk->send_size < (int)(mtu - omtu)) ||
8142                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8143                                 /*
8144                                  * We probably should glom the mbuf chain
8145                                  * from the chk->data for control but the
8146                                  * problem is it becomes yet one more level
8147                                  * of tracking to do if for some reason
8148                                  * output fails. Then I have got to
8149                                  * reconstruct the merged control chain.. el
8150                                  * yucko.. for now we take the easy way and
8151                                  * do the copy
8152                                  */
8153                                 /*
8154                                  * Add an AUTH chunk, if chunk requires it
8155                                  * save the offset into the chain for AUTH
8156                                  */
8157                                 if ((auth == NULL) &&
8158                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8159                                     stcb->asoc.peer_auth_chunks))) {
8160                                         outchain = sctp_add_auth_chunk(outchain,
8161                                             &endoutchain,
8162                                             &auth,
8163                                             &auth_offset,
8164                                             stcb,
8165                                             chk->rec.chunk_id.id);
8166                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8167                                 }
8168                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8169                                     (int)chk->rec.chunk_id.can_take_data,
8170                                     chk->send_size, chk->copy_by_ref);
8171                                 if (outchain == NULL) {
8172                                         *reason_code = 8;
8173                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8174                                         return (ENOMEM);
8175                                 }
8176                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8177                                 /* update our MTU size */
8178                                 if (mtu > (chk->send_size + omtu))
8179                                         mtu -= (chk->send_size + omtu);
8180                                 else
8181                                         mtu = 0;
8182                                 to_out += (chk->send_size + omtu);
8183                                 /* Do clear IP_DF ? */
8184                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8185                                         no_fragmentflg = 0;
8186                                 }
8187                                 if (chk->rec.chunk_id.can_take_data)
8188                                         chk->data = NULL;
8189                                 /*
8190                                  * set hb flag since we can use these for
8191                                  * RTO
8192                                  */
8193                                 hbflag = 1;
8194                                 asconf = 1;
8195                                 /*
8196                                  * should sysctl this: don't bundle data
8197                                  * with ASCONF since it requires AUTH
8198                                  */
8199                                 no_data_chunks = 1;
8200                                 chk->sent = SCTP_DATAGRAM_SENT;
8201                                 if (chk->whoTo == NULL) {
8202                                         chk->whoTo = net;
8203                                         atomic_add_int(&net->ref_count, 1);
8204                                 }
8205                                 chk->snd_count++;
8206                                 if (mtu == 0) {
8207                                         /*
8208                                          * Ok we are out of room but we can
8209                                          * output without effecting the
8210                                          * flight size since this little guy
8211                                          * is a control only packet.
8212                                          */
8213                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8214                                         /*
8215                                          * do NOT clear the asconf flag as
8216                                          * it is used to do appropriate
8217                                          * source address selection.
8218                                          */
8219                                         if (*now_filled == 0) {
8220                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8221                                                 *now_filled = 1;
8222                                         }
8223                                         net->last_sent_time = *now;
8224                                         hbflag = 0;
8225                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8226                                             (struct sockaddr *)&net->ro._l_addr,
8227                                             outchain, auth_offset, auth,
8228                                             stcb->asoc.authinfo.active_keyid,
8229                                             no_fragmentflg, 0, asconf,
8230                                             inp->sctp_lport, stcb->rport,
8231                                             htonl(stcb->asoc.peer_vtag),
8232                                             net->port, NULL,
8233                                             0, 0,
8234                                             so_locked))) {
8235                                                 /*
8236                                                  * error, we could not
8237                                                  * output
8238                                                  */
8239                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8240                                                 if (from_where == 0) {
8241                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8242                                                 }
8243                                                 if (error == ENOBUFS) {
8244                                                         asoc->ifp_had_enobuf = 1;
8245                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8246                                                 }
8247                                                 /* error, could not output */
8248                                                 if (error == EHOSTUNREACH) {
8249                                                         /*
8250                                                          * Destination went
8251                                                          * unreachable
8252                                                          * during this send
8253                                                          */
8254                                                         sctp_move_chunks_from_net(stcb, net);
8255                                                 }
8256                                                 *reason_code = 7;
8257                                                 break;
8258                                         } else {
8259                                                 asoc->ifp_had_enobuf = 0;
8260                                         }
8261                                         /*
8262                                          * increase the number we sent, if a
8263                                          * cookie is sent we don't tell them
8264                                          * any was sent out.
8265                                          */
8266                                         outchain = endoutchain = NULL;
8267                                         auth = NULL;
8268                                         auth_offset = 0;
8269                                         if (!no_out_cnt)
8270                                                 *num_out += ctl_cnt;
8271                                         /* recalc a clean slate and setup */
8272                                         switch (net->ro._l_addr.sa.sa_family) {
8273 #ifdef INET
8274                                         case AF_INET:
8275                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8276                                                 break;
8277 #endif
8278 #ifdef INET6
8279                                         case AF_INET6:
8280                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8281                                                 break;
8282 #endif
8283                                         default:
8284                                                 /* TSNH */
8285                                                 mtu = net->mtu;
8286                                                 break;
8287                                         }
8288                                         to_out = 0;
8289                                         no_fragmentflg = 1;
8290                                 }
8291                         }
8292                 }
8293                 if (error != 0) {
8294                         /* try next net */
8295                         continue;
8296                 }
8297                 /************************/
8298                 /* Control transmission */
8299                 /************************/
8300                 /* Now first lets go through the control queue */
8301                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8302                         if ((sack_goes_to) &&
8303                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8304                             (chk->whoTo != sack_goes_to)) {
8305                                 /*
8306                                  * if we have a sack in queue, and we are
8307                                  * looking at an ecn echo that is NOT queued
8308                                  * to where the sack is going..
8309                                  */
8310                                 if (chk->whoTo == net) {
8311                                         /*
8312                                          * Don't transmit it to where its
8313                                          * going (current net)
8314                                          */
8315                                         continue;
8316                                 } else if (sack_goes_to == net) {
8317                                         /*
8318                                          * But do transmit it to this
8319                                          * address
8320                                          */
8321                                         goto skip_net_check;
8322                                 }
8323                         }
8324                         if (chk->whoTo == NULL) {
8325                                 if (asoc->alternate == NULL) {
8326                                         if (asoc->primary_destination != net) {
8327                                                 continue;
8328                                         }
8329                                 } else {
8330                                         if (asoc->alternate != net) {
8331                                                 continue;
8332                                         }
8333                                 }
8334                         } else {
8335                                 if (chk->whoTo != net) {
8336                                         continue;
8337                                 }
8338                         }
8339         skip_net_check:
8340                         if (chk->data == NULL) {
8341                                 continue;
8342                         }
8343                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8344                                 /*
8345                                  * It must be unsent. Cookies and ASCONF's
8346                                  * hang around but there timers will force
8347                                  * when marked for resend.
8348                                  */
8349                                 continue;
8350                         }
8351                         /*
8352                          * if no AUTH is yet included and this chunk
8353                          * requires it, make sure to account for it.  We
8354                          * don't apply the size until the AUTH chunk is
8355                          * actually added below in case there is no room for
8356                          * this chunk. NOTE: we overload the use of "omtu"
8357                          * here
8358                          */
8359                         if ((auth == NULL) &&
8360                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8361                             stcb->asoc.peer_auth_chunks)) {
8362                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8363                         } else
8364                                 omtu = 0;
8365                         /* Here we do NOT factor the r_mtu */
8366                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8367                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8368                                 /*
8369                                  * We probably should glom the mbuf chain
8370                                  * from the chk->data for control but the
8371                                  * problem is it becomes yet one more level
8372                                  * of tracking to do if for some reason
8373                                  * output fails. Then I have got to
8374                                  * reconstruct the merged control chain.. el
8375                                  * yucko.. for now we take the easy way and
8376                                  * do the copy
8377                                  */
8378                                 /*
8379                                  * Add an AUTH chunk, if chunk requires it
8380                                  * save the offset into the chain for AUTH
8381                                  */
8382                                 if ((auth == NULL) &&
8383                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8384                                     stcb->asoc.peer_auth_chunks))) {
8385                                         outchain = sctp_add_auth_chunk(outchain,
8386                                             &endoutchain,
8387                                             &auth,
8388                                             &auth_offset,
8389                                             stcb,
8390                                             chk->rec.chunk_id.id);
8391                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8392                                 }
8393                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8394                                     (int)chk->rec.chunk_id.can_take_data,
8395                                     chk->send_size, chk->copy_by_ref);
8396                                 if (outchain == NULL) {
8397                                         *reason_code = 8;
8398                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8399                                         return (ENOMEM);
8400                                 }
8401                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8402                                 /* update our MTU size */
8403                                 if (mtu > (chk->send_size + omtu))
8404                                         mtu -= (chk->send_size + omtu);
8405                                 else
8406                                         mtu = 0;
8407                                 to_out += (chk->send_size + omtu);
8408                                 /* Do clear IP_DF ? */
8409                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8410                                         no_fragmentflg = 0;
8411                                 }
8412                                 if (chk->rec.chunk_id.can_take_data)
8413                                         chk->data = NULL;
8414                                 /* Mark things to be removed, if needed */
8415                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8416                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8417                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8418                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8419                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8420                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8421                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8422                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8423                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8424                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8425                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8426                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8427                                                 hbflag = 1;
8428                                         }
8429                                         /* remove these chunks at the end */
8430                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8431                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8432                                                 /* turn off the timer */
8433                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8434                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8435                                                             inp, stcb, net,
8436                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8437                                                 }
8438                                         }
8439                                         ctl_cnt++;
8440                                 } else {
8441                                         /*
8442                                          * Other chunks, since they have
8443                                          * timers running (i.e. COOKIE) we
8444                                          * just "trust" that it gets sent or
8445                                          * retransmitted.
8446                                          */
8447                                         ctl_cnt++;
8448                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8449                                                 cookie = 1;
8450                                                 no_out_cnt = 1;
8451                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8452                                                 /*
8453                                                  * Increment ecne send count
8454                                                  * here this means we may be
8455                                                  * over-zealous in our
8456                                                  * counting if the send
8457                                                  * fails, but its the best
8458                                                  * place to do it (we used
8459                                                  * to do it in the queue of
8460                                                  * the chunk, but that did
8461                                                  * not tell how many times
8462                                                  * it was sent.
8463                                                  */
8464                                                 SCTP_STAT_INCR(sctps_sendecne);
8465                                         }
8466                                         chk->sent = SCTP_DATAGRAM_SENT;
8467                                         if (chk->whoTo == NULL) {
8468                                                 chk->whoTo = net;
8469                                                 atomic_add_int(&net->ref_count, 1);
8470                                         }
8471                                         chk->snd_count++;
8472                                 }
8473                                 if (mtu == 0) {
8474                                         /*
8475                                          * Ok we are out of room but we can
8476                                          * output without effecting the
8477                                          * flight size since this little guy
8478                                          * is a control only packet.
8479                                          */
8480                                         if (asconf) {
8481                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8482                                                 /*
8483                                                  * do NOT clear the asconf
8484                                                  * flag as it is used to do
8485                                                  * appropriate source
8486                                                  * address selection.
8487                                                  */
8488                                         }
8489                                         if (cookie) {
8490                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8491                                                 cookie = 0;
8492                                         }
8493                                         /* Only HB or ASCONF advances time */
8494                                         if (hbflag) {
8495                                                 if (*now_filled == 0) {
8496                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8497                                                         *now_filled = 1;
8498                                                 }
8499                                                 net->last_sent_time = *now;
8500                                                 hbflag = 0;
8501                                         }
8502                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8503                                             (struct sockaddr *)&net->ro._l_addr,
8504                                             outchain,
8505                                             auth_offset, auth,
8506                                             stcb->asoc.authinfo.active_keyid,
8507                                             no_fragmentflg, 0, asconf,
8508                                             inp->sctp_lport, stcb->rport,
8509                                             htonl(stcb->asoc.peer_vtag),
8510                                             net->port, NULL,
8511                                             0, 0,
8512                                             so_locked))) {
8513                                                 /*
8514                                                  * error, we could not
8515                                                  * output
8516                                                  */
8517                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8518                                                 if (from_where == 0) {
8519                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8520                                                 }
8521                                                 if (error == ENOBUFS) {
8522                                                         asoc->ifp_had_enobuf = 1;
8523                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8524                                                 }
8525                                                 if (error == EHOSTUNREACH) {
8526                                                         /*
8527                                                          * Destination went
8528                                                          * unreachable
8529                                                          * during this send
8530                                                          */
8531                                                         sctp_move_chunks_from_net(stcb, net);
8532                                                 }
8533                                                 *reason_code = 7;
8534                                                 break;
8535                                         } else {
8536                                                 asoc->ifp_had_enobuf = 0;
8537                                         }
8538                                         /*
8539                                          * increase the number we sent, if a
8540                                          * cookie is sent we don't tell them
8541                                          * any was sent out.
8542                                          */
8543                                         outchain = endoutchain = NULL;
8544                                         auth = NULL;
8545                                         auth_offset = 0;
8546                                         if (!no_out_cnt)
8547                                                 *num_out += ctl_cnt;
8548                                         /* recalc a clean slate and setup */
8549                                         switch (net->ro._l_addr.sa.sa_family) {
8550 #ifdef INET
8551                                         case AF_INET:
8552                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8553                                                 break;
8554 #endif
8555 #ifdef INET6
8556                                         case AF_INET6:
8557                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8558                                                 break;
8559 #endif
8560                                         default:
8561                                                 /* TSNH */
8562                                                 mtu = net->mtu;
8563                                                 break;
8564                                         }
8565                                         to_out = 0;
8566                                         no_fragmentflg = 1;
8567                                 }
8568                         }
8569                 }
8570                 if (error != 0) {
8571                         /* try next net */
8572                         continue;
8573                 }
8574                 /* JRI: if dest is in PF state, do not send data to it */
8575                 if ((asoc->sctp_cmt_on_off > 0) &&
8576                     (net != stcb->asoc.alternate) &&
8577                     (net->dest_state & SCTP_ADDR_PF)) {
8578                         goto no_data_fill;
8579                 }
8580                 if (net->flight_size >= net->cwnd) {
8581                         goto no_data_fill;
8582                 }
8583                 if ((asoc->sctp_cmt_on_off > 0) &&
8584                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8585                     (net->flight_size > max_rwnd_per_dest)) {
8586                         goto no_data_fill;
8587                 }
8588                 /*
8589                  * We need a specific accounting for the usage of the send
8590                  * buffer. We also need to check the number of messages per
8591                  * net. For now, this is better than nothing and it disabled
8592                  * by default...
8593                  */
8594                 if ((asoc->sctp_cmt_on_off > 0) &&
8595                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8596                     (max_send_per_dest > 0) &&
8597                     (net->flight_size > max_send_per_dest)) {
8598                         goto no_data_fill;
8599                 }
8600                 /*********************/
8601                 /* Data transmission */
8602                 /*********************/
8603                 /*
8604                  * if AUTH for DATA is required and no AUTH has been added
8605                  * yet, account for this in the mtu now... if no data can be
8606                  * bundled, this adjustment won't matter anyways since the
8607                  * packet will be going out...
8608                  */
8609                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8610                     stcb->asoc.peer_auth_chunks);
8611                 if (data_auth_reqd && (auth == NULL)) {
8612                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8613                 }
8614                 /* now lets add any data within the MTU constraints */
8615                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8616 #ifdef INET
8617                 case AF_INET:
8618                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8619                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8620                         else
8621                                 omtu = 0;
8622                         break;
8623 #endif
8624 #ifdef INET6
8625                 case AF_INET6:
8626                         if (net->mtu > SCTP_MIN_OVERHEAD)
8627                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8628                         else
8629                                 omtu = 0;
8630                         break;
8631 #endif
8632                 default:
8633                         /* TSNH */
8634                         omtu = 0;
8635                         break;
8636                 }
8637                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8638                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8639                     (skip_data_for_this_net == 0)) ||
8640                     (cookie)) {
8641                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8642                                 if (no_data_chunks) {
8643                                         /* let only control go out */
8644                                         *reason_code = 1;
8645                                         break;
8646                                 }
8647                                 if (net->flight_size >= net->cwnd) {
8648                                         /* skip this net, no room for data */
8649                                         *reason_code = 2;
8650                                         break;
8651                                 }
8652                                 if ((chk->whoTo != NULL) &&
8653                                     (chk->whoTo != net)) {
8654                                         /* Don't send the chunk on this net */
8655                                         continue;
8656                                 }
8657
8658                                 if (asoc->sctp_cmt_on_off == 0) {
8659                                         if ((asoc->alternate) &&
8660                                             (asoc->alternate != net) &&
8661                                             (chk->whoTo == NULL)) {
8662                                                 continue;
8663                                         } else if ((net != asoc->primary_destination) &&
8664                                                     (asoc->alternate == NULL) &&
8665                                             (chk->whoTo == NULL)) {
8666                                                 continue;
8667                                         }
8668                                 }
8669                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8670                                         /*-
8671                                          * strange, we have a chunk that is
8672                                          * to big for its destination and
8673                                          * yet no fragment ok flag.
8674                                          * Something went wrong when the
8675                                          * PMTU changed...we did not mark
8676                                          * this chunk for some reason?? I
8677                                          * will fix it here by letting IP
8678                                          * fragment it for now and printing
8679                                          * a warning. This really should not
8680                                          * happen ...
8681                                          */
8682                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8683                                             chk->send_size, mtu);
8684                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8685                                 }
8686                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8687                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8688                                         struct sctp_data_chunk *dchkh;
8689
8690                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8691                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8692                                 }
8693                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8694                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8695                                         /* ok we will add this one */
8696
8697                                         /*
8698                                          * Add an AUTH chunk, if chunk
8699                                          * requires it, save the offset into
8700                                          * the chain for AUTH
8701                                          */
8702                                         if (data_auth_reqd) {
8703                                                 if (auth == NULL) {
8704                                                         outchain = sctp_add_auth_chunk(outchain,
8705                                                             &endoutchain,
8706                                                             &auth,
8707                                                             &auth_offset,
8708                                                             stcb,
8709                                                             SCTP_DATA);
8710                                                         auth_keyid = chk->auth_keyid;
8711                                                         override_ok = 0;
8712                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8713                                                 } else if (override_ok) {
8714                                                         /*
8715                                                          * use this data's
8716                                                          * keyid
8717                                                          */
8718                                                         auth_keyid = chk->auth_keyid;
8719                                                         override_ok = 0;
8720                                                 } else if (auth_keyid != chk->auth_keyid) {
8721                                                         /*
8722                                                          * different keyid,
8723                                                          * so done bundling
8724                                                          */
8725                                                         break;
8726                                                 }
8727                                         }
8728                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8729                                             chk->send_size, chk->copy_by_ref);
8730                                         if (outchain == NULL) {
8731                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8732                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8733                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8734                                                 }
8735                                                 *reason_code = 3;
8736                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8737                                                 return (ENOMEM);
8738                                         }
8739                                         /* upate our MTU size */
8740                                         /* Do clear IP_DF ? */
8741                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8742                                                 no_fragmentflg = 0;
8743                                         }
8744                                         /* unsigned subtraction of mtu */
8745                                         if (mtu > chk->send_size)
8746                                                 mtu -= chk->send_size;
8747                                         else
8748                                                 mtu = 0;
8749                                         /* unsigned subtraction of r_mtu */
8750                                         if (r_mtu > chk->send_size)
8751                                                 r_mtu -= chk->send_size;
8752                                         else
8753                                                 r_mtu = 0;
8754
8755                                         to_out += chk->send_size;
8756                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8757 #ifdef INVARIANTS
8758                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8759 #else
8760                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8761                                                     mx_mtu, to_out);
8762 #endif
8763                                         }
8764                                         chk->window_probe = 0;
8765                                         data_list[bundle_at++] = chk;
8766                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8767                                                 break;
8768                                         }
8769                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8770                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8771                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8772                                                 } else {
8773                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8774                                                 }
8775                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8776                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8777                                                         /*
8778                                                          * Count number of
8779                                                          * user msg's that
8780                                                          * were fragmented
8781                                                          * we do this by
8782                                                          * counting when we
8783                                                          * see a LAST
8784                                                          * fragment only.
8785                                                          */
8786                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8787                                         }
8788                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8789                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8790                                                         data_list[0]->window_probe = 1;
8791                                                         net->window_probe = 1;
8792                                                 }
8793                                                 break;
8794                                         }
8795                                 } else {
8796                                         /*
8797                                          * Must be sent in order of the
8798                                          * TSN's (on a network)
8799                                          */
8800                                         break;
8801                                 }
8802                         }       /* for (chunk gather loop for this net) */
8803                 }               /* if asoc.state OPEN */
8804 no_data_fill:
8805                 /* Is there something to send for this destination? */
8806                 if (outchain) {
8807                         /* We may need to start a control timer or two */
8808                         if (asconf) {
8809                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8810                                     stcb, net);
8811                                 /*
8812                                  * do NOT clear the asconf flag as it is
8813                                  * used to do appropriate source address
8814                                  * selection.
8815                                  */
8816                         }
8817                         if (cookie) {
8818                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8819                                 cookie = 0;
8820                         }
8821                         /* must start a send timer if data is being sent */
8822                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8823                                 /*
8824                                  * no timer running on this destination
8825                                  * restart it.
8826                                  */
8827                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8828                         }
8829                         if (bundle_at || hbflag) {
8830                                 /* For data/asconf and hb set time */
8831                                 if (*now_filled == 0) {
8832                                         (void)SCTP_GETTIME_TIMEVAL(now);
8833                                         *now_filled = 1;
8834                                 }
8835                                 net->last_sent_time = *now;
8836                         }
8837                         /* Now send it, if there is anything to send :> */
8838                         if ((error = sctp_lowlevel_chunk_output(inp,
8839                             stcb,
8840                             net,
8841                             (struct sockaddr *)&net->ro._l_addr,
8842                             outchain,
8843                             auth_offset,
8844                             auth,
8845                             auth_keyid,
8846                             no_fragmentflg,
8847                             bundle_at,
8848                             asconf,
8849                             inp->sctp_lport, stcb->rport,
8850                             htonl(stcb->asoc.peer_vtag),
8851                             net->port, NULL,
8852                             0, 0,
8853                             so_locked))) {
8854                                 /* error, we could not output */
8855                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8856                                 if (from_where == 0) {
8857                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8858                                 }
8859                                 if (error == ENOBUFS) {
8860                                         asoc->ifp_had_enobuf = 1;
8861                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8862                                 }
8863                                 if (error == EHOSTUNREACH) {
8864                                         /*
8865                                          * Destination went unreachable
8866                                          * during this send
8867                                          */
8868                                         sctp_move_chunks_from_net(stcb, net);
8869                                 }
8870                                 *reason_code = 6;
8871                                 /*-
8872                                  * I add this line to be paranoid. As far as
8873                                  * I can tell the continue, takes us back to
8874                                  * the top of the for, but just to make sure
8875                                  * I will reset these again here.
8876                                  */
8877                                 ctl_cnt = bundle_at = 0;
8878                                 continue;       /* This takes us back to the
8879                                                  * for() for the nets. */
8880                         } else {
8881                                 asoc->ifp_had_enobuf = 0;
8882                         }
8883                         endoutchain = NULL;
8884                         auth = NULL;
8885                         auth_offset = 0;
8886                         if (!no_out_cnt) {
8887                                 *num_out += (ctl_cnt + bundle_at);
8888                         }
8889                         if (bundle_at) {
8890                                 /* setup for a RTO measurement */
8891                                 tsns_sent = data_list[0]->rec.data.tsn;
8892                                 /* fill time if not already filled */
8893                                 if (*now_filled == 0) {
8894                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8895                                         *now_filled = 1;
8896                                         *now = asoc->time_last_sent;
8897                                 } else {
8898                                         asoc->time_last_sent = *now;
8899                                 }
8900                                 if (net->rto_needed) {
8901                                         data_list[0]->do_rtt = 1;
8902                                         net->rto_needed = 0;
8903                                 }
8904                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8905                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8906                         }
8907                         if (one_chunk) {
8908                                 break;
8909                         }
8910                 }
8911                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8912                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8913                 }
8914         }
8915         if (old_start_at == NULL) {
8916                 old_start_at = start_at;
8917                 start_at = TAILQ_FIRST(&asoc->nets);
8918                 if (old_start_at)
8919                         goto again_one_more_time;
8920         }
8921
8922         /*
8923          * At the end there should be no NON timed chunks hanging on this
8924          * queue.
8925          */
8926         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8927                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8928         }
8929         if ((*num_out == 0) && (*reason_code == 0)) {
8930                 *reason_code = 4;
8931         } else {
8932                 *reason_code = 5;
8933         }
8934         sctp_clean_up_ctl(stcb, asoc, so_locked);
8935         return (0);
8936 }
8937
8938 void
8939 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8940 {
8941         /*-
8942          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8943          * the control chunk queue.
8944          */
8945         struct sctp_chunkhdr *hdr;
8946         struct sctp_tmit_chunk *chk;
8947         struct mbuf *mat, *last_mbuf;
8948         uint32_t chunk_length;
8949         uint16_t padding_length;
8950
8951         SCTP_TCB_LOCK_ASSERT(stcb);
8952         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8953         if (op_err == NULL) {
8954                 return;
8955         }
8956         last_mbuf = NULL;
8957         chunk_length = 0;
8958         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8959                 chunk_length += SCTP_BUF_LEN(mat);
8960                 if (SCTP_BUF_NEXT(mat) == NULL) {
8961                         last_mbuf = mat;
8962                 }
8963         }
8964         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8965                 sctp_m_freem(op_err);
8966                 return;
8967         }
8968         padding_length = chunk_length % 4;
8969         if (padding_length != 0) {
8970                 padding_length = 4 - padding_length;
8971         }
8972         if (padding_length != 0) {
8973                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8974                         sctp_m_freem(op_err);
8975                         return;
8976                 }
8977         }
8978         sctp_alloc_a_chunk(stcb, chk);
8979         if (chk == NULL) {
8980                 /* no memory */
8981                 sctp_m_freem(op_err);
8982                 return;
8983         }
8984         chk->copy_by_ref = 0;
8985         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8986         chk->rec.chunk_id.can_take_data = 0;
8987         chk->flags = 0;
8988         chk->send_size = (uint16_t)chunk_length;
8989         chk->sent = SCTP_DATAGRAM_UNSENT;
8990         chk->snd_count = 0;
8991         chk->asoc = &stcb->asoc;
8992         chk->data = op_err;
8993         chk->whoTo = NULL;
8994         hdr = mtod(op_err, struct sctp_chunkhdr *);
8995         hdr->chunk_type = SCTP_OPERATION_ERROR;
8996         hdr->chunk_flags = 0;
8997         hdr->chunk_length = htons(chk->send_size);
8998         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8999         chk->asoc->ctrl_queue_cnt++;
9000 }
9001
9002 int
9003 sctp_send_cookie_echo(struct mbuf *m,
9004     int offset,
9005     struct sctp_tcb *stcb,
9006     struct sctp_nets *net)
9007 {
9008         /*-
9009          * pull out the cookie and put it at the front of the control chunk
9010          * queue.
9011          */
9012         int at;
9013         struct mbuf *cookie;
9014         struct sctp_paramhdr param, *phdr;
9015         struct sctp_chunkhdr *hdr;
9016         struct sctp_tmit_chunk *chk;
9017         uint16_t ptype, plen;
9018
9019         SCTP_TCB_LOCK_ASSERT(stcb);
9020         /* First find the cookie in the param area */
9021         cookie = NULL;
9022         at = offset + sizeof(struct sctp_init_chunk);
9023         for (;;) {
9024                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9025                 if (phdr == NULL) {
9026                         return (-3);
9027                 }
9028                 ptype = ntohs(phdr->param_type);
9029                 plen = ntohs(phdr->param_length);
9030                 if (ptype == SCTP_STATE_COOKIE) {
9031                         int pad;
9032
9033                         /* found the cookie */
9034                         if ((pad = (plen % 4))) {
9035                                 plen += 4 - pad;
9036                         }
9037                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9038                         if (cookie == NULL) {
9039                                 /* No memory */
9040                                 return (-2);
9041                         }
9042 #ifdef SCTP_MBUF_LOGGING
9043                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9044                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9045                         }
9046 #endif
9047                         break;
9048                 }
9049                 at += SCTP_SIZE32(plen);
9050         }
9051         /* ok, we got the cookie lets change it into a cookie echo chunk */
9052         /* first the change from param to cookie */
9053         hdr = mtod(cookie, struct sctp_chunkhdr *);
9054         hdr->chunk_type = SCTP_COOKIE_ECHO;
9055         hdr->chunk_flags = 0;
9056         /* get the chunk stuff now and place it in the FRONT of the queue */
9057         sctp_alloc_a_chunk(stcb, chk);
9058         if (chk == NULL) {
9059                 /* no memory */
9060                 sctp_m_freem(cookie);
9061                 return (-5);
9062         }
9063         chk->copy_by_ref = 0;
9064         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9065         chk->rec.chunk_id.can_take_data = 0;
9066         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9067         chk->send_size = plen;
9068         chk->sent = SCTP_DATAGRAM_UNSENT;
9069         chk->snd_count = 0;
9070         chk->asoc = &stcb->asoc;
9071         chk->data = cookie;
9072         chk->whoTo = net;
9073         atomic_add_int(&chk->whoTo->ref_count, 1);
9074         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9075         chk->asoc->ctrl_queue_cnt++;
9076         return (0);
9077 }
9078
9079 void
9080 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9081     struct mbuf *m,
9082     int offset,
9083     int chk_length,
9084     struct sctp_nets *net)
9085 {
9086         /*
9087          * take a HB request and make it into a HB ack and send it.
9088          */
9089         struct mbuf *outchain;
9090         struct sctp_chunkhdr *chdr;
9091         struct sctp_tmit_chunk *chk;
9092
9093         if (net == NULL)
9094                 /* must have a net pointer */
9095                 return;
9096
9097         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9098         if (outchain == NULL) {
9099                 /* gak out of memory */
9100                 return;
9101         }
9102 #ifdef SCTP_MBUF_LOGGING
9103         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9104                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9105         }
9106 #endif
9107         chdr = mtod(outchain, struct sctp_chunkhdr *);
9108         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9109         chdr->chunk_flags = 0;
9110         if (chk_length % 4 != 0) {
9111                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9112         }
9113         sctp_alloc_a_chunk(stcb, chk);
9114         if (chk == NULL) {
9115                 /* no memory */
9116                 sctp_m_freem(outchain);
9117                 return;
9118         }
9119         chk->copy_by_ref = 0;
9120         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9121         chk->rec.chunk_id.can_take_data = 1;
9122         chk->flags = 0;
9123         chk->send_size = chk_length;
9124         chk->sent = SCTP_DATAGRAM_UNSENT;
9125         chk->snd_count = 0;
9126         chk->asoc = &stcb->asoc;
9127         chk->data = outchain;
9128         chk->whoTo = net;
9129         atomic_add_int(&chk->whoTo->ref_count, 1);
9130         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9131         chk->asoc->ctrl_queue_cnt++;
9132 }
9133
9134 void
9135 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9136 {
9137         /* formulate and queue a cookie-ack back to sender */
9138         struct mbuf *cookie_ack;
9139         struct sctp_chunkhdr *hdr;
9140         struct sctp_tmit_chunk *chk;
9141
9142         SCTP_TCB_LOCK_ASSERT(stcb);
9143
9144         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9145         if (cookie_ack == NULL) {
9146                 /* no mbuf's */
9147                 return;
9148         }
9149         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9150         sctp_alloc_a_chunk(stcb, chk);
9151         if (chk == NULL) {
9152                 /* no memory */
9153                 sctp_m_freem(cookie_ack);
9154                 return;
9155         }
9156         chk->copy_by_ref = 0;
9157         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9158         chk->rec.chunk_id.can_take_data = 1;
9159         chk->flags = 0;
9160         chk->send_size = sizeof(struct sctp_chunkhdr);
9161         chk->sent = SCTP_DATAGRAM_UNSENT;
9162         chk->snd_count = 0;
9163         chk->asoc = &stcb->asoc;
9164         chk->data = cookie_ack;
9165         if (chk->asoc->last_control_chunk_from != NULL) {
9166                 chk->whoTo = chk->asoc->last_control_chunk_from;
9167                 atomic_add_int(&chk->whoTo->ref_count, 1);
9168         } else {
9169                 chk->whoTo = NULL;
9170         }
9171         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9172         hdr->chunk_type = SCTP_COOKIE_ACK;
9173         hdr->chunk_flags = 0;
9174         hdr->chunk_length = htons(chk->send_size);
9175         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9176         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9177         chk->asoc->ctrl_queue_cnt++;
9178         return;
9179 }
9180
9181
9182 void
9183 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9184 {
9185         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9186         struct mbuf *m_shutdown_ack;
9187         struct sctp_shutdown_ack_chunk *ack_cp;
9188         struct sctp_tmit_chunk *chk;
9189
9190         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9191         if (m_shutdown_ack == NULL) {
9192                 /* no mbuf's */
9193                 return;
9194         }
9195         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9196         sctp_alloc_a_chunk(stcb, chk);
9197         if (chk == NULL) {
9198                 /* no memory */
9199                 sctp_m_freem(m_shutdown_ack);
9200                 return;
9201         }
9202         chk->copy_by_ref = 0;
9203         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9204         chk->rec.chunk_id.can_take_data = 1;
9205         chk->flags = 0;
9206         chk->send_size = sizeof(struct sctp_chunkhdr);
9207         chk->sent = SCTP_DATAGRAM_UNSENT;
9208         chk->snd_count = 0;
9209         chk->asoc = &stcb->asoc;
9210         chk->data = m_shutdown_ack;
9211         chk->whoTo = net;
9212         if (chk->whoTo) {
9213                 atomic_add_int(&chk->whoTo->ref_count, 1);
9214         }
9215         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9216         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9217         ack_cp->ch.chunk_flags = 0;
9218         ack_cp->ch.chunk_length = htons(chk->send_size);
9219         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9220         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9221         chk->asoc->ctrl_queue_cnt++;
9222         return;
9223 }
9224
9225 void
9226 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9227 {
9228         /* formulate and queue a SHUTDOWN to the sender */
9229         struct mbuf *m_shutdown;
9230         struct sctp_shutdown_chunk *shutdown_cp;
9231         struct sctp_tmit_chunk *chk;
9232
9233         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9234                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9235                         /* We already have a SHUTDOWN queued. Reuse it. */
9236                         if (chk->whoTo) {
9237                                 sctp_free_remote_addr(chk->whoTo);
9238                                 chk->whoTo = NULL;
9239                         }
9240                         break;
9241                 }
9242         }
9243         if (chk == NULL) {
9244                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9245                 if (m_shutdown == NULL) {
9246                         /* no mbuf's */
9247                         return;
9248                 }
9249                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9250                 sctp_alloc_a_chunk(stcb, chk);
9251                 if (chk == NULL) {
9252                         /* no memory */
9253                         sctp_m_freem(m_shutdown);
9254                         return;
9255                 }
9256                 chk->copy_by_ref = 0;
9257                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9258                 chk->rec.chunk_id.can_take_data = 1;
9259                 chk->flags = 0;
9260                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9261                 chk->sent = SCTP_DATAGRAM_UNSENT;
9262                 chk->snd_count = 0;
9263                 chk->asoc = &stcb->asoc;
9264                 chk->data = m_shutdown;
9265                 chk->whoTo = net;
9266                 if (chk->whoTo) {
9267                         atomic_add_int(&chk->whoTo->ref_count, 1);
9268                 }
9269                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9270                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9271                 shutdown_cp->ch.chunk_flags = 0;
9272                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9273                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9274                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9275                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9276                 chk->asoc->ctrl_queue_cnt++;
9277         } else {
9278                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9279                 chk->whoTo = net;
9280                 if (chk->whoTo) {
9281                         atomic_add_int(&chk->whoTo->ref_count, 1);
9282                 }
9283                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9284                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9285                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9286         }
9287         return;
9288 }
9289
9290 void
9291 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9292 {
9293         /*
9294          * formulate and queue an ASCONF to the peer. ASCONF parameters
9295          * should be queued on the assoc queue.
9296          */
9297         struct sctp_tmit_chunk *chk;
9298         struct mbuf *m_asconf;
9299         int len;
9300
9301         SCTP_TCB_LOCK_ASSERT(stcb);
9302
9303         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9304             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9305                 /* can't send a new one if there is one in flight already */
9306                 return;
9307         }
9308
9309         /* compose an ASCONF chunk, maximum length is PMTU */
9310         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9311         if (m_asconf == NULL) {
9312                 return;
9313         }
9314
9315         sctp_alloc_a_chunk(stcb, chk);
9316         if (chk == NULL) {
9317                 /* no memory */
9318                 sctp_m_freem(m_asconf);
9319                 return;
9320         }
9321
9322         chk->copy_by_ref = 0;
9323         chk->rec.chunk_id.id = SCTP_ASCONF;
9324         chk->rec.chunk_id.can_take_data = 0;
9325         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9326         chk->data = m_asconf;
9327         chk->send_size = len;
9328         chk->sent = SCTP_DATAGRAM_UNSENT;
9329         chk->snd_count = 0;
9330         chk->asoc = &stcb->asoc;
9331         chk->whoTo = net;
9332         if (chk->whoTo) {
9333                 atomic_add_int(&chk->whoTo->ref_count, 1);
9334         }
9335         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9336         chk->asoc->ctrl_queue_cnt++;
9337         return;
9338 }
9339
9340 void
9341 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9342 {
9343         /*
9344          * formulate and queue a asconf-ack back to sender. the asconf-ack
9345          * must be stored in the tcb.
9346          */
9347         struct sctp_tmit_chunk *chk;
9348         struct sctp_asconf_ack *ack, *latest_ack;
9349         struct mbuf *m_ack;
9350         struct sctp_nets *net = NULL;
9351
9352         SCTP_TCB_LOCK_ASSERT(stcb);
9353         /* Get the latest ASCONF-ACK */
9354         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9355         if (latest_ack == NULL) {
9356                 return;
9357         }
9358         if (latest_ack->last_sent_to != NULL &&
9359             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9360                 /* we're doing a retransmission */
9361                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9362                 if (net == NULL) {
9363                         /* no alternate */
9364                         if (stcb->asoc.last_control_chunk_from == NULL) {
9365                                 if (stcb->asoc.alternate) {
9366                                         net = stcb->asoc.alternate;
9367                                 } else {
9368                                         net = stcb->asoc.primary_destination;
9369                                 }
9370                         } else {
9371                                 net = stcb->asoc.last_control_chunk_from;
9372                         }
9373                 }
9374         } else {
9375                 /* normal case */
9376                 if (stcb->asoc.last_control_chunk_from == NULL) {
9377                         if (stcb->asoc.alternate) {
9378                                 net = stcb->asoc.alternate;
9379                         } else {
9380                                 net = stcb->asoc.primary_destination;
9381                         }
9382                 } else {
9383                         net = stcb->asoc.last_control_chunk_from;
9384                 }
9385         }
9386         latest_ack->last_sent_to = net;
9387
9388         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9389                 if (ack->data == NULL) {
9390                         continue;
9391                 }
9392
9393                 /* copy the asconf_ack */
9394                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9395                 if (m_ack == NULL) {
9396                         /* couldn't copy it */
9397                         return;
9398                 }
9399 #ifdef SCTP_MBUF_LOGGING
9400                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9401                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9402                 }
9403 #endif
9404
9405                 sctp_alloc_a_chunk(stcb, chk);
9406                 if (chk == NULL) {
9407                         /* no memory */
9408                         if (m_ack)
9409                                 sctp_m_freem(m_ack);
9410                         return;
9411                 }
9412                 chk->copy_by_ref = 0;
9413                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9414                 chk->rec.chunk_id.can_take_data = 1;
9415                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9416                 chk->whoTo = net;
9417                 if (chk->whoTo) {
9418                         atomic_add_int(&chk->whoTo->ref_count, 1);
9419                 }
9420                 chk->data = m_ack;
9421                 chk->send_size = ack->len;
9422                 chk->sent = SCTP_DATAGRAM_UNSENT;
9423                 chk->snd_count = 0;
9424                 chk->asoc = &stcb->asoc;
9425
9426                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9427                 chk->asoc->ctrl_queue_cnt++;
9428         }
9429         return;
9430 }
9431
9432
9433 static int
9434 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9435     struct sctp_tcb *stcb,
9436     struct sctp_association *asoc,
9437     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9438 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9439     SCTP_UNUSED
9440 #endif
9441 )
9442 {
9443         /*-
9444          * send out one MTU of retransmission. If fast_retransmit is
9445          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9446          * rwnd. For a Cookie or Asconf in the control chunk queue we
9447          * retransmit them by themselves.
9448          *
9449          * For data chunks we will pick out the lowest TSN's in the sent_queue
9450          * marked for resend and bundle them all together (up to a MTU of
9451          * destination). The address to send to should have been
9452          * selected/changed where the retransmission was marked (i.e. in FR
9453          * or t3-timeout routines).
9454          */
9455         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9456         struct sctp_tmit_chunk *chk, *fwd;
9457         struct mbuf *m, *endofchain;
9458         struct sctp_nets *net = NULL;
9459         uint32_t tsns_sent = 0;
9460         int no_fragmentflg, bundle_at, cnt_thru;
9461         unsigned int mtu;
9462         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9463         struct sctp_auth_chunk *auth = NULL;
9464         uint32_t auth_offset = 0;
9465         uint16_t auth_keyid;
9466         int override_ok = 1;
9467         int data_auth_reqd = 0;
9468         uint32_t dmtu = 0;
9469
9470         SCTP_TCB_LOCK_ASSERT(stcb);
9471         tmr_started = ctl_cnt = bundle_at = error = 0;
9472         no_fragmentflg = 1;
9473         fwd_tsn = 0;
9474         *cnt_out = 0;
9475         fwd = NULL;
9476         endofchain = m = NULL;
9477         auth_keyid = stcb->asoc.authinfo.active_keyid;
9478 #ifdef SCTP_AUDITING_ENABLED
9479         sctp_audit_log(0xC3, 1);
9480 #endif
9481         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9482             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9483                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9484                     asoc->sent_queue_retran_cnt);
9485                 asoc->sent_queue_cnt = 0;
9486                 asoc->sent_queue_cnt_removeable = 0;
9487                 /* send back 0/0 so we enter normal transmission */
9488                 *cnt_out = 0;
9489                 return (0);
9490         }
9491         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9492                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9493                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9494                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9495                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9496                                 continue;
9497                         }
9498                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9499                                 if (chk != asoc->str_reset) {
9500                                         /*
9501                                          * not eligible for retran if its
9502                                          * not ours
9503                                          */
9504                                         continue;
9505                                 }
9506                         }
9507                         ctl_cnt++;
9508                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9509                                 fwd_tsn = 1;
9510                         }
9511                         /*
9512                          * Add an AUTH chunk, if chunk requires it save the
9513                          * offset into the chain for AUTH
9514                          */
9515                         if ((auth == NULL) &&
9516                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9517                             stcb->asoc.peer_auth_chunks))) {
9518                                 m = sctp_add_auth_chunk(m, &endofchain,
9519                                     &auth, &auth_offset,
9520                                     stcb,
9521                                     chk->rec.chunk_id.id);
9522                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9523                         }
9524                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9525                         break;
9526                 }
9527         }
9528         one_chunk = 0;
9529         cnt_thru = 0;
9530         /* do we have control chunks to retransmit? */
9531         if (m != NULL) {
9532                 /* Start a timer no matter if we succeed or fail */
9533                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9534                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9535                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9536                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9537                 chk->snd_count++;       /* update our count */
9538                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9539                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9540                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9541                     no_fragmentflg, 0, 0,
9542                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9543                     chk->whoTo->port, NULL,
9544                     0, 0,
9545                     so_locked))) {
9546                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9547                         if (error == ENOBUFS) {
9548                                 asoc->ifp_had_enobuf = 1;
9549                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9550                         }
9551                         return (error);
9552                 } else {
9553                         asoc->ifp_had_enobuf = 0;
9554                 }
9555                 endofchain = NULL;
9556                 auth = NULL;
9557                 auth_offset = 0;
9558                 /*
9559                  * We don't want to mark the net->sent time here since this
9560                  * we use this for HB and retrans cannot measure RTT
9561                  */
9562                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9563                 *cnt_out += 1;
9564                 chk->sent = SCTP_DATAGRAM_SENT;
9565                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9566                 if (fwd_tsn == 0) {
9567                         return (0);
9568                 } else {
9569                         /* Clean up the fwd-tsn list */
9570                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9571                         return (0);
9572                 }
9573         }
9574         /*
9575          * Ok, it is just data retransmission we need to do or that and a
9576          * fwd-tsn with it all.
9577          */
9578         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9579                 return (SCTP_RETRAN_DONE);
9580         }
9581         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9582             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9583                 /* not yet open, resend the cookie and that is it */
9584                 return (1);
9585         }
9586 #ifdef SCTP_AUDITING_ENABLED
9587         sctp_auditing(20, inp, stcb, NULL);
9588 #endif
9589         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9590         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9591                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9592                         /* No, not sent to this net or not ready for rtx */
9593                         continue;
9594                 }
9595                 if (chk->data == NULL) {
9596                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9597                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9598                         continue;
9599                 }
9600                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9601                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9602                         struct mbuf *op_err;
9603                         char msg[SCTP_DIAG_INFO_LEN];
9604
9605                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9606                             chk->rec.data.tsn, chk->snd_count);
9607                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9608                             msg);
9609                         atomic_add_int(&stcb->asoc.refcnt, 1);
9610                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9611                             so_locked);
9612                         SCTP_TCB_LOCK(stcb);
9613                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9614                         return (SCTP_RETRAN_EXIT);
9615                 }
9616                 /* pick up the net */
9617                 net = chk->whoTo;
9618                 switch (net->ro._l_addr.sa.sa_family) {
9619 #ifdef INET
9620                 case AF_INET:
9621                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9622                         break;
9623 #endif
9624 #ifdef INET6
9625                 case AF_INET6:
9626                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9627                         break;
9628 #endif
9629                 default:
9630                         /* TSNH */
9631                         mtu = net->mtu;
9632                         break;
9633                 }
9634
9635                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9636                         /* No room in peers rwnd */
9637                         uint32_t tsn;
9638
9639                         tsn = asoc->last_acked_seq + 1;
9640                         if (tsn == chk->rec.data.tsn) {
9641                                 /*
9642                                  * we make a special exception for this
9643                                  * case. The peer has no rwnd but is missing
9644                                  * the lowest chunk.. which is probably what
9645                                  * is holding up the rwnd.
9646                                  */
9647                                 goto one_chunk_around;
9648                         }
9649                         return (1);
9650                 }
9651 one_chunk_around:
9652                 if (asoc->peers_rwnd < mtu) {
9653                         one_chunk = 1;
9654                         if ((asoc->peers_rwnd == 0) &&
9655                             (asoc->total_flight == 0)) {
9656                                 chk->window_probe = 1;
9657                                 chk->whoTo->window_probe = 1;
9658                         }
9659                 }
9660 #ifdef SCTP_AUDITING_ENABLED
9661                 sctp_audit_log(0xC3, 2);
9662 #endif
9663                 bundle_at = 0;
9664                 m = NULL;
9665                 net->fast_retran_ip = 0;
9666                 if (chk->rec.data.doing_fast_retransmit == 0) {
9667                         /*
9668                          * if no FR in progress skip destination that have
9669                          * flight_size > cwnd.
9670                          */
9671                         if (net->flight_size >= net->cwnd) {
9672                                 continue;
9673                         }
9674                 } else {
9675                         /*
9676                          * Mark the destination net to have FR recovery
9677                          * limits put on it.
9678                          */
9679                         *fr_done = 1;
9680                         net->fast_retran_ip = 1;
9681                 }
9682
9683                 /*
9684                  * if no AUTH is yet included and this chunk requires it,
9685                  * make sure to account for it.  We don't apply the size
9686                  * until the AUTH chunk is actually added below in case
9687                  * there is no room for this chunk.
9688                  */
9689                 if (data_auth_reqd && (auth == NULL)) {
9690                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9691                 } else
9692                         dmtu = 0;
9693
9694                 if ((chk->send_size <= (mtu - dmtu)) ||
9695                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9696                         /* ok we will add this one */
9697                         if (data_auth_reqd) {
9698                                 if (auth == NULL) {
9699                                         m = sctp_add_auth_chunk(m,
9700                                             &endofchain,
9701                                             &auth,
9702                                             &auth_offset,
9703                                             stcb,
9704                                             SCTP_DATA);
9705                                         auth_keyid = chk->auth_keyid;
9706                                         override_ok = 0;
9707                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9708                                 } else if (override_ok) {
9709                                         auth_keyid = chk->auth_keyid;
9710                                         override_ok = 0;
9711                                 } else if (chk->auth_keyid != auth_keyid) {
9712                                         /* different keyid, so done bundling */
9713                                         break;
9714                                 }
9715                         }
9716                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9717                         if (m == NULL) {
9718                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9719                                 return (ENOMEM);
9720                         }
9721                         /* Do clear IP_DF ? */
9722                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9723                                 no_fragmentflg = 0;
9724                         }
9725                         /* upate our MTU size */
9726                         if (mtu > (chk->send_size + dmtu))
9727                                 mtu -= (chk->send_size + dmtu);
9728                         else
9729                                 mtu = 0;
9730                         data_list[bundle_at++] = chk;
9731                         if (one_chunk && (asoc->total_flight <= 0)) {
9732                                 SCTP_STAT_INCR(sctps_windowprobed);
9733                         }
9734                 }
9735                 if (one_chunk == 0) {
9736                         /*
9737                          * now are there anymore forward from chk to pick
9738                          * up?
9739                          */
9740                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9741                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9742                                         /* Nope, not for retran */
9743                                         continue;
9744                                 }
9745                                 if (fwd->whoTo != net) {
9746                                         /* Nope, not the net in question */
9747                                         continue;
9748                                 }
9749                                 if (data_auth_reqd && (auth == NULL)) {
9750                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9751                                 } else
9752                                         dmtu = 0;
9753                                 if (fwd->send_size <= (mtu - dmtu)) {
9754                                         if (data_auth_reqd) {
9755                                                 if (auth == NULL) {
9756                                                         m = sctp_add_auth_chunk(m,
9757                                                             &endofchain,
9758                                                             &auth,
9759                                                             &auth_offset,
9760                                                             stcb,
9761                                                             SCTP_DATA);
9762                                                         auth_keyid = fwd->auth_keyid;
9763                                                         override_ok = 0;
9764                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9765                                                 } else if (override_ok) {
9766                                                         auth_keyid = fwd->auth_keyid;
9767                                                         override_ok = 0;
9768                                                 } else if (fwd->auth_keyid != auth_keyid) {
9769                                                         /*
9770                                                          * different keyid,
9771                                                          * so done bundling
9772                                                          */
9773                                                         break;
9774                                                 }
9775                                         }
9776                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9777                                         if (m == NULL) {
9778                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9779                                                 return (ENOMEM);
9780                                         }
9781                                         /* Do clear IP_DF ? */
9782                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9783                                                 no_fragmentflg = 0;
9784                                         }
9785                                         /* upate our MTU size */
9786                                         if (mtu > (fwd->send_size + dmtu))
9787                                                 mtu -= (fwd->send_size + dmtu);
9788                                         else
9789                                                 mtu = 0;
9790                                         data_list[bundle_at++] = fwd;
9791                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9792                                                 break;
9793                                         }
9794                                 } else {
9795                                         /* can't fit so we are done */
9796                                         break;
9797                                 }
9798                         }
9799                 }
9800                 /* Is there something to send for this destination? */
9801                 if (m) {
9802                         /*
9803                          * No matter if we fail/or succeed we should start a
9804                          * timer. A failure is like a lost IP packet :-)
9805                          */
9806                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9807                                 /*
9808                                  * no timer running on this destination
9809                                  * restart it.
9810                                  */
9811                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9812                                 tmr_started = 1;
9813                         }
9814                         /* Now lets send it, if there is anything to send :> */
9815                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9816                             (struct sockaddr *)&net->ro._l_addr, m,
9817                             auth_offset, auth, auth_keyid,
9818                             no_fragmentflg, 0, 0,
9819                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9820                             net->port, NULL,
9821                             0, 0,
9822                             so_locked))) {
9823                                 /* error, we could not output */
9824                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9825                                 if (error == ENOBUFS) {
9826                                         asoc->ifp_had_enobuf = 1;
9827                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9828                                 }
9829                                 return (error);
9830                         } else {
9831                                 asoc->ifp_had_enobuf = 0;
9832                         }
9833                         endofchain = NULL;
9834                         auth = NULL;
9835                         auth_offset = 0;
9836                         /* For HB's */
9837                         /*
9838                          * We don't want to mark the net->sent time here
9839                          * since this we use this for HB and retrans cannot
9840                          * measure RTT
9841                          */
9842                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9843
9844                         /* For auto-close */
9845                         cnt_thru++;
9846                         if (*now_filled == 0) {
9847                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9848                                 *now = asoc->time_last_sent;
9849                                 *now_filled = 1;
9850                         } else {
9851                                 asoc->time_last_sent = *now;
9852                         }
9853                         *cnt_out += bundle_at;
9854 #ifdef SCTP_AUDITING_ENABLED
9855                         sctp_audit_log(0xC4, bundle_at);
9856 #endif
9857                         if (bundle_at) {
9858                                 tsns_sent = data_list[0]->rec.data.tsn;
9859                         }
9860                         for (i = 0; i < bundle_at; i++) {
9861                                 SCTP_STAT_INCR(sctps_sendretransdata);
9862                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9863                                 /*
9864                                  * When we have a revoked data, and we
9865                                  * retransmit it, then we clear the revoked
9866                                  * flag since this flag dictates if we
9867                                  * subtracted from the fs
9868                                  */
9869                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9870                                         /* Deflate the cwnd */
9871                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9872                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9873                                 }
9874                                 data_list[i]->snd_count++;
9875                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9876                                 /* record the time */
9877                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9878                                 if (data_list[i]->book_size_scale) {
9879                                         /*
9880                                          * need to double the book size on
9881                                          * this one
9882                                          */
9883                                         data_list[i]->book_size_scale = 0;
9884                                         /*
9885                                          * Since we double the booksize, we
9886                                          * must also double the output queue
9887                                          * size, since this get shrunk when
9888                                          * we free by this amount.
9889                                          */
9890                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9891                                         data_list[i]->book_size *= 2;
9892
9893
9894                                 } else {
9895                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9896                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9897                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9898                                         }
9899                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9900                                             (uint32_t)(data_list[i]->send_size +
9901                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9902                                 }
9903                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9904                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9905                                             data_list[i]->whoTo->flight_size,
9906                                             data_list[i]->book_size,
9907                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9908                                             data_list[i]->rec.data.tsn);
9909                                 }
9910                                 sctp_flight_size_increase(data_list[i]);
9911                                 sctp_total_flight_increase(stcb, data_list[i]);
9912                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9913                                         /* SWS sender side engages */
9914                                         asoc->peers_rwnd = 0;
9915                                 }
9916                                 if ((i == 0) &&
9917                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9918                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9919                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9920                                             (tmr_started == 0)) {
9921                                                 /*-
9922                                                  * ok we just fast-retrans'd
9923                                                  * the lowest TSN, i.e the
9924                                                  * first on the list. In
9925                                                  * this case we want to give
9926                                                  * some more time to get a
9927                                                  * SACK back without a
9928                                                  * t3-expiring.
9929                                                  */
9930                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9931                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9932                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9933                                         }
9934                                 }
9935                         }
9936                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9937                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9938                         }
9939 #ifdef SCTP_AUDITING_ENABLED
9940                         sctp_auditing(21, inp, stcb, NULL);
9941 #endif
9942                 } else {
9943                         /* None will fit */
9944                         return (1);
9945                 }
9946                 if (asoc->sent_queue_retran_cnt <= 0) {
9947                         /* all done we have no more to retran */
9948                         asoc->sent_queue_retran_cnt = 0;
9949                         break;
9950                 }
9951                 if (one_chunk) {
9952                         /* No more room in rwnd */
9953                         return (1);
9954                 }
9955                 /* stop the for loop here. we sent out a packet */
9956                 break;
9957         }
9958         return (0);
9959 }
9960
9961 static void
9962 sctp_timer_validation(struct sctp_inpcb *inp,
9963     struct sctp_tcb *stcb,
9964     struct sctp_association *asoc)
9965 {
9966         struct sctp_nets *net;
9967
9968         /* Validate that a timer is running somewhere */
9969         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9970                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9971                         /* Here is a timer */
9972                         return;
9973                 }
9974         }
9975         SCTP_TCB_LOCK_ASSERT(stcb);
9976         /* Gak, we did not have a timer somewhere */
9977         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9978         if (asoc->alternate) {
9979                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9980         } else {
9981                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9982         }
9983         return;
9984 }
9985
9986 void
9987 sctp_chunk_output(struct sctp_inpcb *inp,
9988     struct sctp_tcb *stcb,
9989     int from_where,
9990     int so_locked
9991 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9992     SCTP_UNUSED
9993 #endif
9994 )
9995 {
9996         /*-
9997          * Ok this is the generic chunk service queue. we must do the
9998          * following:
9999          * - See if there are retransmits pending, if so we must
10000          *   do these first.
10001          * - Service the stream queue that is next, moving any
10002          *   message (note I must get a complete message i.e.
10003          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10004          *   TSN's
10005          * - Check to see if the cwnd/rwnd allows any output, if so we
10006          *   go ahead and fomulate and send the low level chunks. Making sure
10007          *   to combine any control in the control chunk queue also.
10008          */
10009         struct sctp_association *asoc;
10010         struct sctp_nets *net;
10011         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10012         unsigned int burst_cnt = 0;
10013         struct timeval now;
10014         int now_filled = 0;
10015         int nagle_on;
10016         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10017         int un_sent = 0;
10018         int fr_done;
10019         unsigned int tot_frs = 0;
10020
10021         asoc = &stcb->asoc;
10022 do_it_again:
10023         /* The Nagle algorithm is only applied when handling a send call. */
10024         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10025                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10026                         nagle_on = 0;
10027                 } else {
10028                         nagle_on = 1;
10029                 }
10030         } else {
10031                 nagle_on = 0;
10032         }
10033         SCTP_TCB_LOCK_ASSERT(stcb);
10034
10035         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10036
10037         if ((un_sent <= 0) &&
10038             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10039             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10040             (asoc->sent_queue_retran_cnt == 0) &&
10041             (asoc->trigger_reset == 0)) {
10042                 /* Nothing to do unless there is something to be sent left */
10043                 return;
10044         }
10045         /*
10046          * Do we have something to send, data or control AND a sack timer
10047          * running, if so piggy-back the sack.
10048          */
10049         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10050                 sctp_send_sack(stcb, so_locked);
10051                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10052         }
10053         while (asoc->sent_queue_retran_cnt) {
10054                 /*-
10055                  * Ok, it is retransmission time only, we send out only ONE
10056                  * packet with a single call off to the retran code.
10057                  */
10058                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10059                         /*-
10060                          * Special hook for handling cookiess discarded
10061                          * by peer that carried data. Send cookie-ack only
10062                          * and then the next call with get the retran's.
10063                          */
10064                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10065                             from_where,
10066                             &now, &now_filled, frag_point, so_locked);
10067                         return;
10068                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10069                         /* if its not from a HB then do it */
10070                         fr_done = 0;
10071                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10072                         if (fr_done) {
10073                                 tot_frs++;
10074                         }
10075                 } else {
10076                         /*
10077                          * its from any other place, we don't allow retran
10078                          * output (only control)
10079                          */
10080                         ret = 1;
10081                 }
10082                 if (ret > 0) {
10083                         /* Can't send anymore */
10084                         /*-
10085                          * now lets push out control by calling med-level
10086                          * output once. this assures that we WILL send HB's
10087                          * if queued too.
10088                          */
10089                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10090                             from_where,
10091                             &now, &now_filled, frag_point, so_locked);
10092 #ifdef SCTP_AUDITING_ENABLED
10093                         sctp_auditing(8, inp, stcb, NULL);
10094 #endif
10095                         sctp_timer_validation(inp, stcb, asoc);
10096                         return;
10097                 }
10098                 if (ret < 0) {
10099                         /*-
10100                          * The count was off.. retran is not happening so do
10101                          * the normal retransmission.
10102                          */
10103 #ifdef SCTP_AUDITING_ENABLED
10104                         sctp_auditing(9, inp, stcb, NULL);
10105 #endif
10106                         if (ret == SCTP_RETRAN_EXIT) {
10107                                 return;
10108                         }
10109                         break;
10110                 }
10111                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10112                         /* Only one transmission allowed out of a timeout */
10113 #ifdef SCTP_AUDITING_ENABLED
10114                         sctp_auditing(10, inp, stcb, NULL);
10115 #endif
10116                         /* Push out any control */
10117                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10118                             &now, &now_filled, frag_point, so_locked);
10119                         return;
10120                 }
10121                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10122                         /* Hit FR burst limit */
10123                         return;
10124                 }
10125                 if ((num_out == 0) && (ret == 0)) {
10126                         /* No more retrans to send */
10127                         break;
10128                 }
10129         }
10130 #ifdef SCTP_AUDITING_ENABLED
10131         sctp_auditing(12, inp, stcb, NULL);
10132 #endif
10133         /* Check for bad destinations, if they exist move chunks around. */
10134         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10135                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10136                         /*-
10137                          * if possible move things off of this address we
10138                          * still may send below due to the dormant state but
10139                          * we try to find an alternate address to send to
10140                          * and if we have one we move all queued data on the
10141                          * out wheel to this alternate address.
10142                          */
10143                         if (net->ref_count > 1)
10144                                 sctp_move_chunks_from_net(stcb, net);
10145                 } else {
10146                         /*-
10147                          * if ((asoc->sat_network) || (net->addr_is_local))
10148                          * { burst_limit = asoc->max_burst *
10149                          * SCTP_SAT_NETWORK_BURST_INCR; }
10150                          */
10151                         if (asoc->max_burst > 0) {
10152                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10153                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10154                                                 /*
10155                                                  * JRS - Use the congestion
10156                                                  * control given in the
10157                                                  * congestion control module
10158                                                  */
10159                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10160                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10161                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10162                                                 }
10163                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10164                                         }
10165                                         net->fast_retran_ip = 0;
10166                                 } else {
10167                                         if (net->flight_size == 0) {
10168                                                 /*
10169                                                  * Should be decaying the
10170                                                  * cwnd here
10171                                                  */
10172                                                 ;
10173                                         }
10174                                 }
10175                         }
10176                 }
10177
10178         }
10179         burst_cnt = 0;
10180         do {
10181                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10182                     &reason_code, 0, from_where,
10183                     &now, &now_filled, frag_point, so_locked);
10184                 if (error) {
10185                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10186                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10187                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10188                         }
10189                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10190                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10191                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10192                         }
10193                         break;
10194                 }
10195                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10196
10197                 tot_out += num_out;
10198                 burst_cnt++;
10199                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10200                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10201                         if (num_out == 0) {
10202                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10203                         }
10204                 }
10205                 if (nagle_on) {
10206                         /*
10207                          * When the Nagle algorithm is used, look at how
10208                          * much is unsent, then if its smaller than an MTU
10209                          * and we have data in flight we stop, except if we
10210                          * are handling a fragmented user message.
10211                          */
10212                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10213                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10214                             (stcb->asoc.total_flight > 0)) {
10215 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10216                                 break;
10217                         }
10218                 }
10219                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10220                     TAILQ_EMPTY(&asoc->send_queue) &&
10221                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10222                         /* Nothing left to send */
10223                         break;
10224                 }
10225                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10226                         /* Nothing left to send */
10227                         break;
10228                 }
10229         } while (num_out &&
10230             ((asoc->max_burst == 0) ||
10231             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10232             (burst_cnt < asoc->max_burst)));
10233
10234         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10235                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10236                         SCTP_STAT_INCR(sctps_maxburstqueued);
10237                         asoc->burst_limit_applied = 1;
10238                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10239                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10240                         }
10241                 } else {
10242                         asoc->burst_limit_applied = 0;
10243                 }
10244         }
10245         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10246                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10247         }
10248         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10249             tot_out);
10250
10251         /*-
10252          * Now we need to clean up the control chunk chain if a ECNE is on
10253          * it. It must be marked as UNSENT again so next call will continue
10254          * to send it until such time that we get a CWR, to remove it.
10255          */
10256         if (stcb->asoc.ecn_echo_cnt_onq)
10257                 sctp_fix_ecn_echo(asoc);
10258
10259         if (stcb->asoc.trigger_reset) {
10260                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10261                         goto do_it_again;
10262                 }
10263         }
10264         return;
10265 }
10266
10267
10268 int
10269 sctp_output(
10270     struct sctp_inpcb *inp,
10271     struct mbuf *m,
10272     struct sockaddr *addr,
10273     struct mbuf *control,
10274     struct thread *p,
10275     int flags)
10276 {
10277         if (inp == NULL) {
10278                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10279                 return (EINVAL);
10280         }
10281
10282         if (inp->sctp_socket == NULL) {
10283                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10284                 return (EINVAL);
10285         }
10286         return (sctp_sosend(inp->sctp_socket,
10287             addr,
10288             (struct uio *)NULL,
10289             m,
10290             control,
10291             flags, p
10292             ));
10293 }
10294
10295 void
10296 send_forward_tsn(struct sctp_tcb *stcb,
10297     struct sctp_association *asoc)
10298 {
10299         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10300         struct sctp_forward_tsn_chunk *fwdtsn;
10301         struct sctp_strseq *strseq;
10302         struct sctp_strseq_mid *strseq_m;
10303         uint32_t advance_peer_ack_point;
10304         unsigned int cnt_of_space, i, ovh;
10305         unsigned int space_needed;
10306         unsigned int cnt_of_skipped = 0;
10307
10308         SCTP_TCB_LOCK_ASSERT(stcb);
10309         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10310                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10311                         /* mark it to unsent */
10312                         chk->sent = SCTP_DATAGRAM_UNSENT;
10313                         chk->snd_count = 0;
10314                         /* Do we correct its output location? */
10315                         if (chk->whoTo) {
10316                                 sctp_free_remote_addr(chk->whoTo);
10317                                 chk->whoTo = NULL;
10318                         }
10319                         goto sctp_fill_in_rest;
10320                 }
10321         }
10322         /* Ok if we reach here we must build one */
10323         sctp_alloc_a_chunk(stcb, chk);
10324         if (chk == NULL) {
10325                 return;
10326         }
10327         asoc->fwd_tsn_cnt++;
10328         chk->copy_by_ref = 0;
10329         /*
10330          * We don't do the old thing here since this is used not for on-wire
10331          * but to tell if we are sending a fwd-tsn by the stack during
10332          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10333          */
10334         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10335         chk->rec.chunk_id.can_take_data = 0;
10336         chk->flags = 0;
10337         chk->asoc = asoc;
10338         chk->whoTo = NULL;
10339         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10340         if (chk->data == NULL) {
10341                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10342                 return;
10343         }
10344         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10345         chk->sent = SCTP_DATAGRAM_UNSENT;
10346         chk->snd_count = 0;
10347         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10348         asoc->ctrl_queue_cnt++;
10349 sctp_fill_in_rest:
10350         /*-
10351          * Here we go through and fill out the part that deals with
10352          * stream/seq of the ones we skip.
10353          */
10354         SCTP_BUF_LEN(chk->data) = 0;
10355         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10356                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10357                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10358                         /* no more to look at */
10359                         break;
10360                 }
10361                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10362                         /* We don't report these */
10363                         continue;
10364                 }
10365                 cnt_of_skipped++;
10366         }
10367         if (asoc->idata_supported) {
10368                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10369                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10370         } else {
10371                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10372                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10373         }
10374         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10375
10376         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10377                 ovh = SCTP_MIN_OVERHEAD;
10378         } else {
10379                 ovh = SCTP_MIN_V4_OVERHEAD;
10380         }
10381         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10382                 /* trim to a mtu size */
10383                 cnt_of_space = asoc->smallest_mtu - ovh;
10384         }
10385         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10386                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10387                     0xff, 0, cnt_of_skipped,
10388                     asoc->advanced_peer_ack_point);
10389         }
10390         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10391         if (cnt_of_space < space_needed) {
10392                 /*-
10393                  * ok we must trim down the chunk by lowering the
10394                  * advance peer ack point.
10395                  */
10396                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10397                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10398                             0xff, 0xff, cnt_of_space,
10399                             space_needed);
10400                 }
10401                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10402                 if (asoc->idata_supported) {
10403                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10404                 } else {
10405                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10406                 }
10407                 /*-
10408                  * Go through and find the TSN that will be the one
10409                  * we report.
10410                  */
10411                 at = TAILQ_FIRST(&asoc->sent_queue);
10412                 if (at != NULL) {
10413                         for (i = 0; i < cnt_of_skipped; i++) {
10414                                 tp1 = TAILQ_NEXT(at, sctp_next);
10415                                 if (tp1 == NULL) {
10416                                         break;
10417                                 }
10418                                 at = tp1;
10419                         }
10420                 }
10421                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10422                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10423                             0xff, cnt_of_skipped, at->rec.data.tsn,
10424                             asoc->advanced_peer_ack_point);
10425                 }
10426                 last = at;
10427                 /*-
10428                  * last now points to last one I can report, update
10429                  * peer ack point
10430                  */
10431                 if (last) {
10432                         advance_peer_ack_point = last->rec.data.tsn;
10433                 }
10434                 if (asoc->idata_supported) {
10435                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10436                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10437                 } else {
10438                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10439                             cnt_of_skipped * sizeof(struct sctp_strseq);
10440                 }
10441         }
10442         chk->send_size = space_needed;
10443         /* Setup the chunk */
10444         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10445         fwdtsn->ch.chunk_length = htons(chk->send_size);
10446         fwdtsn->ch.chunk_flags = 0;
10447         if (asoc->idata_supported) {
10448                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10449         } else {
10450                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10451         }
10452         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10453         SCTP_BUF_LEN(chk->data) = chk->send_size;
10454         fwdtsn++;
10455         /*-
10456          * Move pointer to after the fwdtsn and transfer to the
10457          * strseq pointer.
10458          */
10459         if (asoc->idata_supported) {
10460                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10461                 strseq = NULL;
10462         } else {
10463                 strseq = (struct sctp_strseq *)fwdtsn;
10464                 strseq_m = NULL;
10465         }
10466         /*-
10467          * Now populate the strseq list. This is done blindly
10468          * without pulling out duplicate stream info. This is
10469          * inefficent but won't harm the process since the peer will
10470          * look at these in sequence and will thus release anything.
10471          * It could mean we exceed the PMTU and chop off some that
10472          * we could have included.. but this is unlikely (aka 1432/4
10473          * would mean 300+ stream seq's would have to be reported in
10474          * one FWD-TSN. With a bit of work we can later FIX this to
10475          * optimize and pull out duplicates.. but it does add more
10476          * overhead. So for now... not!
10477          */
10478         i = 0;
10479         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10480                 if (i >= cnt_of_skipped) {
10481                         break;
10482                 }
10483                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10484                         /* We don't report these */
10485                         continue;
10486                 }
10487                 if (at->rec.data.tsn == advance_peer_ack_point) {
10488                         at->rec.data.fwd_tsn_cnt = 0;
10489                 }
10490                 if (asoc->idata_supported) {
10491                         strseq_m->sid = htons(at->rec.data.sid);
10492                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10493                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10494                         } else {
10495                                 strseq_m->flags = 0;
10496                         }
10497                         strseq_m->mid = htonl(at->rec.data.mid);
10498                         strseq_m++;
10499                 } else {
10500                         strseq->sid = htons(at->rec.data.sid);
10501                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10502                         strseq++;
10503                 }
10504                 i++;
10505         }
10506         return;
10507 }
10508
10509 void
10510 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10511 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10512     SCTP_UNUSED
10513 #endif
10514 )
10515 {
10516         /*-
10517          * Queue up a SACK or NR-SACK in the control queue.
10518          * We must first check to see if a SACK or NR-SACK is
10519          * somehow on the control queue.
10520          * If so, we will take and and remove the old one.
10521          */
10522         struct sctp_association *asoc;
10523         struct sctp_tmit_chunk *chk, *a_chk;
10524         struct sctp_sack_chunk *sack;
10525         struct sctp_nr_sack_chunk *nr_sack;
10526         struct sctp_gap_ack_block *gap_descriptor;
10527         const struct sack_track *selector;
10528         int mergeable = 0;
10529         int offset;
10530         caddr_t limit;
10531         uint32_t *dup;
10532         int limit_reached = 0;
10533         unsigned int i, siz, j;
10534         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10535         int num_dups = 0;
10536         int space_req;
10537         uint32_t highest_tsn;
10538         uint8_t flags;
10539         uint8_t type;
10540         uint8_t tsn_map;
10541
10542         if (stcb->asoc.nrsack_supported == 1) {
10543                 type = SCTP_NR_SELECTIVE_ACK;
10544         } else {
10545                 type = SCTP_SELECTIVE_ACK;
10546         }
10547         a_chk = NULL;
10548         asoc = &stcb->asoc;
10549         SCTP_TCB_LOCK_ASSERT(stcb);
10550         if (asoc->last_data_chunk_from == NULL) {
10551                 /* Hmm we never received anything */
10552                 return;
10553         }
10554         sctp_slide_mapping_arrays(stcb);
10555         sctp_set_rwnd(stcb, asoc);
10556         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10557                 if (chk->rec.chunk_id.id == type) {
10558                         /* Hmm, found a sack already on queue, remove it */
10559                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10560                         asoc->ctrl_queue_cnt--;
10561                         a_chk = chk;
10562                         if (a_chk->data) {
10563                                 sctp_m_freem(a_chk->data);
10564                                 a_chk->data = NULL;
10565                         }
10566                         if (a_chk->whoTo) {
10567                                 sctp_free_remote_addr(a_chk->whoTo);
10568                                 a_chk->whoTo = NULL;
10569                         }
10570                         break;
10571                 }
10572         }
10573         if (a_chk == NULL) {
10574                 sctp_alloc_a_chunk(stcb, a_chk);
10575                 if (a_chk == NULL) {
10576                         /* No memory so we drop the idea, and set a timer */
10577                         if (stcb->asoc.delayed_ack) {
10578                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10579                                     stcb->sctp_ep, stcb, NULL,
10580                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10581                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10582                                     stcb->sctp_ep, stcb, NULL);
10583                         } else {
10584                                 stcb->asoc.send_sack = 1;
10585                         }
10586                         return;
10587                 }
10588                 a_chk->copy_by_ref = 0;
10589                 a_chk->rec.chunk_id.id = type;
10590                 a_chk->rec.chunk_id.can_take_data = 1;
10591         }
10592         /* Clear our pkt counts */
10593         asoc->data_pkts_seen = 0;
10594
10595         a_chk->flags = 0;
10596         a_chk->asoc = asoc;
10597         a_chk->snd_count = 0;
10598         a_chk->send_size = 0;   /* fill in later */
10599         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10600         a_chk->whoTo = NULL;
10601
10602         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10603                 /*-
10604                  * Ok, the destination for the SACK is unreachable, lets see if
10605                  * we can select an alternate to asoc->last_data_chunk_from
10606                  */
10607                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10608                 if (a_chk->whoTo == NULL) {
10609                         /* Nope, no alternate */
10610                         a_chk->whoTo = asoc->last_data_chunk_from;
10611                 }
10612         } else {
10613                 a_chk->whoTo = asoc->last_data_chunk_from;
10614         }
10615         if (a_chk->whoTo) {
10616                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10617         }
10618         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10619                 highest_tsn = asoc->highest_tsn_inside_map;
10620         } else {
10621                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10622         }
10623         if (highest_tsn == asoc->cumulative_tsn) {
10624                 /* no gaps */
10625                 if (type == SCTP_SELECTIVE_ACK) {
10626                         space_req = sizeof(struct sctp_sack_chunk);
10627                 } else {
10628                         space_req = sizeof(struct sctp_nr_sack_chunk);
10629                 }
10630         } else {
10631                 /* gaps get a cluster */
10632                 space_req = MCLBYTES;
10633         }
10634         /* Ok now lets formulate a MBUF with our sack */
10635         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10636         if ((a_chk->data == NULL) ||
10637             (a_chk->whoTo == NULL)) {
10638                 /* rats, no mbuf memory */
10639                 if (a_chk->data) {
10640                         /* was a problem with the destination */
10641                         sctp_m_freem(a_chk->data);
10642                         a_chk->data = NULL;
10643                 }
10644                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10645                 /* sa_ignore NO_NULL_CHK */
10646                 if (stcb->asoc.delayed_ack) {
10647                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10648                             stcb->sctp_ep, stcb, NULL,
10649                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10650                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10651                             stcb->sctp_ep, stcb, NULL);
10652                 } else {
10653                         stcb->asoc.send_sack = 1;
10654                 }
10655                 return;
10656         }
10657         /* ok, lets go through and fill it in */
10658         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10659         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10660         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10661                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10662         }
10663         limit = mtod(a_chk->data, caddr_t);
10664         limit += space;
10665
10666         flags = 0;
10667
10668         if ((asoc->sctp_cmt_on_off > 0) &&
10669             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10670                 /*-
10671                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10672                  * received, then set high bit to 1, else 0. Reset
10673                  * pkts_rcvd.
10674                  */
10675                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10676                 asoc->cmt_dac_pkts_rcvd = 0;
10677         }
10678 #ifdef SCTP_ASOCLOG_OF_TSNS
10679         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10680         stcb->asoc.cumack_log_atsnt++;
10681         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10682                 stcb->asoc.cumack_log_atsnt = 0;
10683         }
10684 #endif
10685         /* reset the readers interpretation */
10686         stcb->freed_by_sorcv_sincelast = 0;
10687
10688         if (type == SCTP_SELECTIVE_ACK) {
10689                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10690                 nr_sack = NULL;
10691                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10692                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10693                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10694                 } else {
10695                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10696                 }
10697         } else {
10698                 sack = NULL;
10699                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10700                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10701                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10702                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10703                 } else {
10704                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10705                 }
10706         }
10707
10708         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10709                 offset = 1;
10710         } else {
10711                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10712         }
10713         if (((type == SCTP_SELECTIVE_ACK) &&
10714             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10715             ((type == SCTP_NR_SELECTIVE_ACK) &&
10716             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10717                 /* we have a gap .. maybe */
10718                 for (i = 0; i < siz; i++) {
10719                         tsn_map = asoc->mapping_array[i];
10720                         if (type == SCTP_SELECTIVE_ACK) {
10721                                 tsn_map |= asoc->nr_mapping_array[i];
10722                         }
10723                         if (i == 0) {
10724                                 /*
10725                                  * Clear all bits corresponding to TSNs
10726                                  * smaller or equal to the cumulative TSN.
10727                                  */
10728                                 tsn_map &= (~0U << (1 - offset));
10729                         }
10730                         selector = &sack_array[tsn_map];
10731                         if (mergeable && selector->right_edge) {
10732                                 /*
10733                                  * Backup, left and right edges were ok to
10734                                  * merge.
10735                                  */
10736                                 num_gap_blocks--;
10737                                 gap_descriptor--;
10738                         }
10739                         if (selector->num_entries == 0)
10740                                 mergeable = 0;
10741                         else {
10742                                 for (j = 0; j < selector->num_entries; j++) {
10743                                         if (mergeable && selector->right_edge) {
10744                                                 /*
10745                                                  * do a merge by NOT setting
10746                                                  * the left side
10747                                                  */
10748                                                 mergeable = 0;
10749                                         } else {
10750                                                 /*
10751                                                  * no merge, set the left
10752                                                  * side
10753                                                  */
10754                                                 mergeable = 0;
10755                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10756                                         }
10757                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10758                                         num_gap_blocks++;
10759                                         gap_descriptor++;
10760                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10761                                                 /* no more room */
10762                                                 limit_reached = 1;
10763                                                 break;
10764                                         }
10765                                 }
10766                                 if (selector->left_edge) {
10767                                         mergeable = 1;
10768                                 }
10769                         }
10770                         if (limit_reached) {
10771                                 /* Reached the limit stop */
10772                                 break;
10773                         }
10774                         offset += 8;
10775                 }
10776         }
10777         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10778             (limit_reached == 0)) {
10779
10780                 mergeable = 0;
10781
10782                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10783                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10784                 } else {
10785                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10786                 }
10787
10788                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10789                         offset = 1;
10790                 } else {
10791                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10792                 }
10793                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10794                         /* we have a gap .. maybe */
10795                         for (i = 0; i < siz; i++) {
10796                                 tsn_map = asoc->nr_mapping_array[i];
10797                                 if (i == 0) {
10798                                         /*
10799                                          * Clear all bits corresponding to
10800                                          * TSNs smaller or equal to the
10801                                          * cumulative TSN.
10802                                          */
10803                                         tsn_map &= (~0U << (1 - offset));
10804                                 }
10805                                 selector = &sack_array[tsn_map];
10806                                 if (mergeable && selector->right_edge) {
10807                                         /*
10808                                          * Backup, left and right edges were
10809                                          * ok to merge.
10810                                          */
10811                                         num_nr_gap_blocks--;
10812                                         gap_descriptor--;
10813                                 }
10814                                 if (selector->num_entries == 0)
10815                                         mergeable = 0;
10816                                 else {
10817                                         for (j = 0; j < selector->num_entries; j++) {
10818                                                 if (mergeable && selector->right_edge) {
10819                                                         /*
10820                                                          * do a merge by NOT
10821                                                          * setting the left
10822                                                          * side
10823                                                          */
10824                                                         mergeable = 0;
10825                                                 } else {
10826                                                         /*
10827                                                          * no merge, set the
10828                                                          * left side
10829                                                          */
10830                                                         mergeable = 0;
10831                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10832                                                 }
10833                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10834                                                 num_nr_gap_blocks++;
10835                                                 gap_descriptor++;
10836                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10837                                                         /* no more room */
10838                                                         limit_reached = 1;
10839                                                         break;
10840                                                 }
10841                                         }
10842                                         if (selector->left_edge) {
10843                                                 mergeable = 1;
10844                                         }
10845                                 }
10846                                 if (limit_reached) {
10847                                         /* Reached the limit stop */
10848                                         break;
10849                                 }
10850                                 offset += 8;
10851                         }
10852                 }
10853         }
10854         /* now we must add any dups we are going to report. */
10855         if ((limit_reached == 0) && (asoc->numduptsns)) {
10856                 dup = (uint32_t *)gap_descriptor;
10857                 for (i = 0; i < asoc->numduptsns; i++) {
10858                         *dup = htonl(asoc->dup_tsns[i]);
10859                         dup++;
10860                         num_dups++;
10861                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10862                                 /* no more room */
10863                                 break;
10864                         }
10865                 }
10866                 asoc->numduptsns = 0;
10867         }
10868         /*
10869          * now that the chunk is prepared queue it to the control chunk
10870          * queue.
10871          */
10872         if (type == SCTP_SELECTIVE_ACK) {
10873                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10874                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10875                     num_dups * sizeof(int32_t));
10876                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10877                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10878                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10879                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10880                 sack->sack.num_dup_tsns = htons(num_dups);
10881                 sack->ch.chunk_type = type;
10882                 sack->ch.chunk_flags = flags;
10883                 sack->ch.chunk_length = htons(a_chk->send_size);
10884         } else {
10885                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10886                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10887                     num_dups * sizeof(int32_t));
10888                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10889                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10890                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10891                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10892                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10893                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10894                 nr_sack->nr_sack.reserved = 0;
10895                 nr_sack->ch.chunk_type = type;
10896                 nr_sack->ch.chunk_flags = flags;
10897                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10898         }
10899         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10900         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10901         asoc->ctrl_queue_cnt++;
10902         asoc->send_sack = 0;
10903         SCTP_STAT_INCR(sctps_sendsacks);
10904         return;
10905 }
10906
10907 void
10908 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10909 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10910     SCTP_UNUSED
10911 #endif
10912 )
10913 {
10914         struct mbuf *m_abort, *m, *m_last;
10915         struct mbuf *m_out, *m_end = NULL;
10916         struct sctp_abort_chunk *abort;
10917         struct sctp_auth_chunk *auth = NULL;
10918         struct sctp_nets *net;
10919         uint32_t vtag;
10920         uint32_t auth_offset = 0;
10921         int error;
10922         uint16_t cause_len, chunk_len, padding_len;
10923
10924         SCTP_TCB_LOCK_ASSERT(stcb);
10925         /*-
10926          * Add an AUTH chunk, if chunk requires it and save the offset into
10927          * the chain for AUTH
10928          */
10929         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10930             stcb->asoc.peer_auth_chunks)) {
10931                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10932                     stcb, SCTP_ABORT_ASSOCIATION);
10933                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10934         } else {
10935                 m_out = NULL;
10936         }
10937         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10938         if (m_abort == NULL) {
10939                 if (m_out) {
10940                         sctp_m_freem(m_out);
10941                 }
10942                 if (operr) {
10943                         sctp_m_freem(operr);
10944                 }
10945                 return;
10946         }
10947         /* link in any error */
10948         SCTP_BUF_NEXT(m_abort) = operr;
10949         cause_len = 0;
10950         m_last = NULL;
10951         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10952                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10953                 if (SCTP_BUF_NEXT(m) == NULL) {
10954                         m_last = m;
10955                 }
10956         }
10957         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10958         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10959         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10960         if (m_out == NULL) {
10961                 /* NO Auth chunk prepended, so reserve space in front */
10962                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10963                 m_out = m_abort;
10964         } else {
10965                 /* Put AUTH chunk at the front of the chain */
10966                 SCTP_BUF_NEXT(m_end) = m_abort;
10967         }
10968         if (stcb->asoc.alternate) {
10969                 net = stcb->asoc.alternate;
10970         } else {
10971                 net = stcb->asoc.primary_destination;
10972         }
10973         /* Fill in the ABORT chunk header. */
10974         abort = mtod(m_abort, struct sctp_abort_chunk *);
10975         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10976         if (stcb->asoc.peer_vtag == 0) {
10977                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10978                 vtag = stcb->asoc.my_vtag;
10979                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10980         } else {
10981                 vtag = stcb->asoc.peer_vtag;
10982                 abort->ch.chunk_flags = 0;
10983         }
10984         abort->ch.chunk_length = htons(chunk_len);
10985         /* Add padding, if necessary. */
10986         if (padding_len > 0) {
10987                 if ((m_last == NULL) ||
10988                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10989                         sctp_m_freem(m_out);
10990                         return;
10991                 }
10992         }
10993         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10994             (struct sockaddr *)&net->ro._l_addr,
10995             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10996             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10997             stcb->asoc.primary_destination->port, NULL,
10998             0, 0,
10999             so_locked))) {
11000                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11001                 if (error == ENOBUFS) {
11002                         stcb->asoc.ifp_had_enobuf = 1;
11003                         SCTP_STAT_INCR(sctps_lowlevelerr);
11004                 }
11005         } else {
11006                 stcb->asoc.ifp_had_enobuf = 0;
11007         }
11008         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11009 }
11010
11011 void
11012 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11013     struct sctp_nets *net,
11014     int reflect_vtag)
11015 {
11016         /* formulate and SEND a SHUTDOWN-COMPLETE */
11017         struct mbuf *m_shutdown_comp;
11018         struct sctp_shutdown_complete_chunk *shutdown_complete;
11019         uint32_t vtag;
11020         int error;
11021         uint8_t flags;
11022
11023         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11024         if (m_shutdown_comp == NULL) {
11025                 /* no mbuf's */
11026                 return;
11027         }
11028         if (reflect_vtag) {
11029                 flags = SCTP_HAD_NO_TCB;
11030                 vtag = stcb->asoc.my_vtag;
11031         } else {
11032                 flags = 0;
11033                 vtag = stcb->asoc.peer_vtag;
11034         }
11035         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11036         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11037         shutdown_complete->ch.chunk_flags = flags;
11038         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11039         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11040         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11041             (struct sockaddr *)&net->ro._l_addr,
11042             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11043             stcb->sctp_ep->sctp_lport, stcb->rport,
11044             htonl(vtag),
11045             net->port, NULL,
11046             0, 0,
11047             SCTP_SO_NOT_LOCKED))) {
11048                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11049                 if (error == ENOBUFS) {
11050                         stcb->asoc.ifp_had_enobuf = 1;
11051                         SCTP_STAT_INCR(sctps_lowlevelerr);
11052                 }
11053         } else {
11054                 stcb->asoc.ifp_had_enobuf = 0;
11055         }
11056         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11057         return;
11058 }
11059
11060 static void
11061 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11062     struct sctphdr *sh, uint32_t vtag,
11063     uint8_t type, struct mbuf *cause,
11064     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11065     uint32_t vrf_id, uint16_t port)
11066 {
11067         struct mbuf *o_pak;
11068         struct mbuf *mout;
11069         struct sctphdr *shout;
11070         struct sctp_chunkhdr *ch;
11071 #if defined(INET) || defined(INET6)
11072         struct udphdr *udp;
11073 #endif
11074         int ret, len, cause_len, padding_len;
11075 #ifdef INET
11076         struct sockaddr_in *src_sin, *dst_sin;
11077         struct ip *ip;
11078 #endif
11079 #ifdef INET6
11080         struct sockaddr_in6 *src_sin6, *dst_sin6;
11081         struct ip6_hdr *ip6;
11082 #endif
11083
11084         /* Compute the length of the cause and add final padding. */
11085         cause_len = 0;
11086         if (cause != NULL) {
11087                 struct mbuf *m_at, *m_last = NULL;
11088
11089                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11090                         if (SCTP_BUF_NEXT(m_at) == NULL)
11091                                 m_last = m_at;
11092                         cause_len += SCTP_BUF_LEN(m_at);
11093                 }
11094                 padding_len = cause_len % 4;
11095                 if (padding_len != 0) {
11096                         padding_len = 4 - padding_len;
11097                 }
11098                 if (padding_len != 0) {
11099                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11100                                 sctp_m_freem(cause);
11101                                 return;
11102                         }
11103                 }
11104         } else {
11105                 padding_len = 0;
11106         }
11107         /* Get an mbuf for the header. */
11108         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11109         switch (dst->sa_family) {
11110 #ifdef INET
11111         case AF_INET:
11112                 len += sizeof(struct ip);
11113                 break;
11114 #endif
11115 #ifdef INET6
11116         case AF_INET6:
11117                 len += sizeof(struct ip6_hdr);
11118                 break;
11119 #endif
11120         default:
11121                 break;
11122         }
11123 #if defined(INET) || defined(INET6)
11124         if (port) {
11125                 len += sizeof(struct udphdr);
11126         }
11127 #endif
11128         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11129         if (mout == NULL) {
11130                 if (cause) {
11131                         sctp_m_freem(cause);
11132                 }
11133                 return;
11134         }
11135         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11136         SCTP_BUF_LEN(mout) = len;
11137         SCTP_BUF_NEXT(mout) = cause;
11138         M_SETFIB(mout, fibnum);
11139         mout->m_pkthdr.flowid = mflowid;
11140         M_HASHTYPE_SET(mout, mflowtype);
11141 #ifdef INET
11142         ip = NULL;
11143 #endif
11144 #ifdef INET6
11145         ip6 = NULL;
11146 #endif
11147         switch (dst->sa_family) {
11148 #ifdef INET
11149         case AF_INET:
11150                 src_sin = (struct sockaddr_in *)src;
11151                 dst_sin = (struct sockaddr_in *)dst;
11152                 ip = mtod(mout, struct ip *);
11153                 ip->ip_v = IPVERSION;
11154                 ip->ip_hl = (sizeof(struct ip) >> 2);
11155                 ip->ip_tos = 0;
11156                 ip->ip_off = htons(IP_DF);
11157                 ip_fillid(ip);
11158                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11159                 if (port) {
11160                         ip->ip_p = IPPROTO_UDP;
11161                 } else {
11162                         ip->ip_p = IPPROTO_SCTP;
11163                 }
11164                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11165                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11166                 ip->ip_sum = 0;
11167                 len = sizeof(struct ip);
11168                 shout = (struct sctphdr *)((caddr_t)ip + len);
11169                 break;
11170 #endif
11171 #ifdef INET6
11172         case AF_INET6:
11173                 src_sin6 = (struct sockaddr_in6 *)src;
11174                 dst_sin6 = (struct sockaddr_in6 *)dst;
11175                 ip6 = mtod(mout, struct ip6_hdr *);
11176                 ip6->ip6_flow = htonl(0x60000000);
11177                 if (V_ip6_auto_flowlabel) {
11178                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11179                 }
11180                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11181                 if (port) {
11182                         ip6->ip6_nxt = IPPROTO_UDP;
11183                 } else {
11184                         ip6->ip6_nxt = IPPROTO_SCTP;
11185                 }
11186                 ip6->ip6_src = dst_sin6->sin6_addr;
11187                 ip6->ip6_dst = src_sin6->sin6_addr;
11188                 len = sizeof(struct ip6_hdr);
11189                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11190                 break;
11191 #endif
11192         default:
11193                 len = 0;
11194                 shout = mtod(mout, struct sctphdr *);
11195                 break;
11196         }
11197 #if defined(INET) || defined(INET6)
11198         if (port) {
11199                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11200                         sctp_m_freem(mout);
11201                         return;
11202                 }
11203                 udp = (struct udphdr *)shout;
11204                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11205                 udp->uh_dport = port;
11206                 udp->uh_sum = 0;
11207                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11208                     sizeof(struct sctphdr) +
11209                     sizeof(struct sctp_chunkhdr) +
11210                     cause_len + padding_len));
11211                 len += sizeof(struct udphdr);
11212                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11213         } else {
11214                 udp = NULL;
11215         }
11216 #endif
11217         shout->src_port = sh->dest_port;
11218         shout->dest_port = sh->src_port;
11219         shout->checksum = 0;
11220         if (vtag) {
11221                 shout->v_tag = htonl(vtag);
11222         } else {
11223                 shout->v_tag = sh->v_tag;
11224         }
11225         len += sizeof(struct sctphdr);
11226         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11227         ch->chunk_type = type;
11228         if (vtag) {
11229                 ch->chunk_flags = 0;
11230         } else {
11231                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11232         }
11233         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11234         len += sizeof(struct sctp_chunkhdr);
11235         len += cause_len + padding_len;
11236
11237         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11238                 sctp_m_freem(mout);
11239                 return;
11240         }
11241         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11242         switch (dst->sa_family) {
11243 #ifdef INET
11244         case AF_INET:
11245                 if (port) {
11246                         if (V_udp_cksum) {
11247                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11248                         } else {
11249                                 udp->uh_sum = 0;
11250                         }
11251                 }
11252                 ip->ip_len = htons(len);
11253                 if (port) {
11254                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11255                         SCTP_STAT_INCR(sctps_sendswcrc);
11256                         if (V_udp_cksum) {
11257                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11258                         }
11259                 } else {
11260                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11261                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11262                         SCTP_STAT_INCR(sctps_sendhwcrc);
11263                 }
11264 #ifdef SCTP_PACKET_LOGGING
11265                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11266                         sctp_packet_log(o_pak);
11267                 }
11268 #endif
11269                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11270                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11271                 break;
11272 #endif
11273 #ifdef INET6
11274         case AF_INET6:
11275                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11276                 if (port) {
11277                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11278                         SCTP_STAT_INCR(sctps_sendswcrc);
11279                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11280                                 udp->uh_sum = 0xffff;
11281                         }
11282                 } else {
11283                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11284                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11285                         SCTP_STAT_INCR(sctps_sendhwcrc);
11286                 }
11287 #ifdef SCTP_PACKET_LOGGING
11288                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11289                         sctp_packet_log(o_pak);
11290                 }
11291 #endif
11292                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11293                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11294                 break;
11295 #endif
11296         default:
11297                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11298                     dst->sa_family);
11299                 sctp_m_freem(mout);
11300                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11301                 return;
11302         }
11303         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11304         if (port) {
11305                 UDPSTAT_INC(udps_opackets);
11306         }
11307         SCTP_STAT_INCR(sctps_sendpackets);
11308         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11309         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11310         if (ret) {
11311                 SCTP_STAT_INCR(sctps_senderrors);
11312         }
11313         return;
11314 }
11315
11316 void
11317 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11318     struct sctphdr *sh,
11319     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11320     uint32_t vrf_id, uint16_t port)
11321 {
11322         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11323             mflowtype, mflowid, fibnum,
11324             vrf_id, port);
11325 }
11326
11327 void
11328 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11329 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11330     SCTP_UNUSED
11331 #endif
11332 )
11333 {
11334         struct sctp_tmit_chunk *chk;
11335         struct sctp_heartbeat_chunk *hb;
11336         struct timeval now;
11337
11338         SCTP_TCB_LOCK_ASSERT(stcb);
11339         if (net == NULL) {
11340                 return;
11341         }
11342         (void)SCTP_GETTIME_TIMEVAL(&now);
11343         switch (net->ro._l_addr.sa.sa_family) {
11344 #ifdef INET
11345         case AF_INET:
11346                 break;
11347 #endif
11348 #ifdef INET6
11349         case AF_INET6:
11350                 break;
11351 #endif
11352         default:
11353                 return;
11354         }
11355         sctp_alloc_a_chunk(stcb, chk);
11356         if (chk == NULL) {
11357                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11358                 return;
11359         }
11360
11361         chk->copy_by_ref = 0;
11362         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11363         chk->rec.chunk_id.can_take_data = 1;
11364         chk->flags = 0;
11365         chk->asoc = &stcb->asoc;
11366         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11367
11368         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11369         if (chk->data == NULL) {
11370                 sctp_free_a_chunk(stcb, chk, so_locked);
11371                 return;
11372         }
11373         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11374         SCTP_BUF_LEN(chk->data) = chk->send_size;
11375         chk->sent = SCTP_DATAGRAM_UNSENT;
11376         chk->snd_count = 0;
11377         chk->whoTo = net;
11378         atomic_add_int(&chk->whoTo->ref_count, 1);
11379         /* Now we have a mbuf that we can fill in with the details */
11380         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11381         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11382         /* fill out chunk header */
11383         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11384         hb->ch.chunk_flags = 0;
11385         hb->ch.chunk_length = htons(chk->send_size);
11386         /* Fill out hb parameter */
11387         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11388         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11389         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11390         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11391         /* Did our user request this one, put it in */
11392         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11393         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11394         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11395                 /*
11396                  * we only take from the entropy pool if the address is not
11397                  * confirmed.
11398                  */
11399                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11400                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11401         } else {
11402                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11403                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11404         }
11405         switch (net->ro._l_addr.sa.sa_family) {
11406 #ifdef INET
11407         case AF_INET:
11408                 memcpy(hb->heartbeat.hb_info.address,
11409                     &net->ro._l_addr.sin.sin_addr,
11410                     sizeof(net->ro._l_addr.sin.sin_addr));
11411                 break;
11412 #endif
11413 #ifdef INET6
11414         case AF_INET6:
11415                 memcpy(hb->heartbeat.hb_info.address,
11416                     &net->ro._l_addr.sin6.sin6_addr,
11417                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11418                 break;
11419 #endif
11420         default:
11421                 if (chk->data) {
11422                         sctp_m_freem(chk->data);
11423                         chk->data = NULL;
11424                 }
11425                 sctp_free_a_chunk(stcb, chk, so_locked);
11426                 return;
11427                 break;
11428         }
11429         net->hb_responded = 0;
11430         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11431         stcb->asoc.ctrl_queue_cnt++;
11432         SCTP_STAT_INCR(sctps_sendheartbeat);
11433         return;
11434 }
11435
11436 void
11437 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11438     uint32_t high_tsn)
11439 {
11440         struct sctp_association *asoc;
11441         struct sctp_ecne_chunk *ecne;
11442         struct sctp_tmit_chunk *chk;
11443
11444         if (net == NULL) {
11445                 return;
11446         }
11447         asoc = &stcb->asoc;
11448         SCTP_TCB_LOCK_ASSERT(stcb);
11449         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11450                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11451                         /* found a previous ECN_ECHO update it if needed */
11452                         uint32_t cnt, ctsn;
11453
11454                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11455                         ctsn = ntohl(ecne->tsn);
11456                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11457                                 ecne->tsn = htonl(high_tsn);
11458                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11459                         }
11460                         cnt = ntohl(ecne->num_pkts_since_cwr);
11461                         cnt++;
11462                         ecne->num_pkts_since_cwr = htonl(cnt);
11463                         return;
11464                 }
11465         }
11466         /* nope could not find one to update so we must build one */
11467         sctp_alloc_a_chunk(stcb, chk);
11468         if (chk == NULL) {
11469                 return;
11470         }
11471         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11472         chk->copy_by_ref = 0;
11473         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11474         chk->rec.chunk_id.can_take_data = 0;
11475         chk->flags = 0;
11476         chk->asoc = &stcb->asoc;
11477         chk->send_size = sizeof(struct sctp_ecne_chunk);
11478         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11479         if (chk->data == NULL) {
11480                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11481                 return;
11482         }
11483         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11484         SCTP_BUF_LEN(chk->data) = chk->send_size;
11485         chk->sent = SCTP_DATAGRAM_UNSENT;
11486         chk->snd_count = 0;
11487         chk->whoTo = net;
11488         atomic_add_int(&chk->whoTo->ref_count, 1);
11489
11490         stcb->asoc.ecn_echo_cnt_onq++;
11491         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11492         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11493         ecne->ch.chunk_flags = 0;
11494         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11495         ecne->tsn = htonl(high_tsn);
11496         ecne->num_pkts_since_cwr = htonl(1);
11497         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11498         asoc->ctrl_queue_cnt++;
11499 }
11500
11501 void
11502 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11503     struct mbuf *m, int len, int iphlen, int bad_crc)
11504 {
11505         struct sctp_association *asoc;
11506         struct sctp_pktdrop_chunk *drp;
11507         struct sctp_tmit_chunk *chk;
11508         uint8_t *datap;
11509         int was_trunc = 0;
11510         int fullsz = 0;
11511         long spc;
11512         int offset;
11513         struct sctp_chunkhdr *ch, chunk_buf;
11514         unsigned int chk_length;
11515
11516         if (!stcb) {
11517                 return;
11518         }
11519         asoc = &stcb->asoc;
11520         SCTP_TCB_LOCK_ASSERT(stcb);
11521         if (asoc->pktdrop_supported == 0) {
11522                 /*-
11523                  * peer must declare support before I send one.
11524                  */
11525                 return;
11526         }
11527         if (stcb->sctp_socket == NULL) {
11528                 return;
11529         }
11530         sctp_alloc_a_chunk(stcb, chk);
11531         if (chk == NULL) {
11532                 return;
11533         }
11534         chk->copy_by_ref = 0;
11535         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11536         chk->rec.chunk_id.can_take_data = 1;
11537         chk->flags = 0;
11538         len -= iphlen;
11539         chk->send_size = len;
11540         /* Validate that we do not have an ABORT in here. */
11541         offset = iphlen + sizeof(struct sctphdr);
11542         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11543             sizeof(*ch), (uint8_t *)&chunk_buf);
11544         while (ch != NULL) {
11545                 chk_length = ntohs(ch->chunk_length);
11546                 if (chk_length < sizeof(*ch)) {
11547                         /* break to abort land */
11548                         break;
11549                 }
11550                 switch (ch->chunk_type) {
11551                 case SCTP_PACKET_DROPPED:
11552                 case SCTP_ABORT_ASSOCIATION:
11553                 case SCTP_INITIATION_ACK:
11554                         /**
11555                          * We don't respond with an PKT-DROP to an ABORT
11556                          * or PKT-DROP. We also do not respond to an
11557                          * INIT-ACK, because we can't know if the initiation
11558                          * tag is correct or not.
11559                          */
11560                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11561                         return;
11562                 default:
11563                         break;
11564                 }
11565                 offset += SCTP_SIZE32(chk_length);
11566                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11567                     sizeof(*ch), (uint8_t *)&chunk_buf);
11568         }
11569
11570         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11571             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11572                 /*
11573                  * only send 1 mtu worth, trim off the excess on the end.
11574                  */
11575                 fullsz = len;
11576                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11577                 was_trunc = 1;
11578         }
11579         chk->asoc = &stcb->asoc;
11580         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11581         if (chk->data == NULL) {
11582 jump_out:
11583                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11584                 return;
11585         }
11586         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11587         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11588         if (drp == NULL) {
11589                 sctp_m_freem(chk->data);
11590                 chk->data = NULL;
11591                 goto jump_out;
11592         }
11593         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11594             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11595         chk->book_size_scale = 0;
11596         if (was_trunc) {
11597                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11598                 drp->trunc_len = htons(fullsz);
11599                 /*
11600                  * Len is already adjusted to size minus overhead above take
11601                  * out the pkt_drop chunk itself from it.
11602                  */
11603                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11604                 len = chk->send_size;
11605         } else {
11606                 /* no truncation needed */
11607                 drp->ch.chunk_flags = 0;
11608                 drp->trunc_len = htons(0);
11609         }
11610         if (bad_crc) {
11611                 drp->ch.chunk_flags |= SCTP_BADCRC;
11612         }
11613         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11614         SCTP_BUF_LEN(chk->data) = chk->send_size;
11615         chk->sent = SCTP_DATAGRAM_UNSENT;
11616         chk->snd_count = 0;
11617         if (net) {
11618                 /* we should hit here */
11619                 chk->whoTo = net;
11620                 atomic_add_int(&chk->whoTo->ref_count, 1);
11621         } else {
11622                 chk->whoTo = NULL;
11623         }
11624         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11625         drp->ch.chunk_length = htons(chk->send_size);
11626         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11627         if (spc < 0) {
11628                 spc = 0;
11629         }
11630         drp->bottle_bw = htonl(spc);
11631         if (asoc->my_rwnd) {
11632                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11633                     asoc->size_on_all_streams +
11634                     asoc->my_rwnd_control_len +
11635                     stcb->sctp_socket->so_rcv.sb_cc);
11636         } else {
11637                 /*-
11638                  * If my rwnd is 0, possibly from mbuf depletion as well as
11639                  * space used, tell the peer there is NO space aka onq == bw
11640                  */
11641                 drp->current_onq = htonl(spc);
11642         }
11643         drp->reserved = 0;
11644         datap = drp->data;
11645         m_copydata(m, iphlen, len, (caddr_t)datap);
11646         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11647         asoc->ctrl_queue_cnt++;
11648 }
11649
11650 void
11651 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11652 {
11653         struct sctp_association *asoc;
11654         struct sctp_cwr_chunk *cwr;
11655         struct sctp_tmit_chunk *chk;
11656
11657         SCTP_TCB_LOCK_ASSERT(stcb);
11658         if (net == NULL) {
11659                 return;
11660         }
11661         asoc = &stcb->asoc;
11662         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11663                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11664                         /*
11665                          * found a previous CWR queued to same destination
11666                          * update it if needed
11667                          */
11668                         uint32_t ctsn;
11669
11670                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11671                         ctsn = ntohl(cwr->tsn);
11672                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11673                                 cwr->tsn = htonl(high_tsn);
11674                         }
11675                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11676                                 /* Make sure override is carried */
11677                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11678                         }
11679                         return;
11680                 }
11681         }
11682         sctp_alloc_a_chunk(stcb, chk);
11683         if (chk == NULL) {
11684                 return;
11685         }
11686         chk->copy_by_ref = 0;
11687         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11688         chk->rec.chunk_id.can_take_data = 1;
11689         chk->flags = 0;
11690         chk->asoc = &stcb->asoc;
11691         chk->send_size = sizeof(struct sctp_cwr_chunk);
11692         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11693         if (chk->data == NULL) {
11694                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11695                 return;
11696         }
11697         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11698         SCTP_BUF_LEN(chk->data) = chk->send_size;
11699         chk->sent = SCTP_DATAGRAM_UNSENT;
11700         chk->snd_count = 0;
11701         chk->whoTo = net;
11702         atomic_add_int(&chk->whoTo->ref_count, 1);
11703         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11704         cwr->ch.chunk_type = SCTP_ECN_CWR;
11705         cwr->ch.chunk_flags = override;
11706         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11707         cwr->tsn = htonl(high_tsn);
11708         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11709         asoc->ctrl_queue_cnt++;
11710 }
11711
11712 static int
11713 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11714     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11715 {
11716         uint16_t len, old_len, i;
11717         struct sctp_stream_reset_out_request *req_out;
11718         struct sctp_chunkhdr *ch;
11719         int at;
11720         int number_entries = 0;
11721
11722         ch = mtod(chk->data, struct sctp_chunkhdr *);
11723         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11724         /* get to new offset for the param. */
11725         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11726         /* now how long will this param be? */
11727         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11728                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11729                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11730                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11731                         number_entries++;
11732                 }
11733         }
11734         if (number_entries == 0) {
11735                 return (0);
11736         }
11737         if (number_entries == stcb->asoc.streamoutcnt) {
11738                 number_entries = 0;
11739         }
11740         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11741                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11742         }
11743         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11744         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11745         req_out->ph.param_length = htons(len);
11746         req_out->request_seq = htonl(seq);
11747         req_out->response_seq = htonl(resp_seq);
11748         req_out->send_reset_at_tsn = htonl(last_sent);
11749         at = 0;
11750         if (number_entries) {
11751                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11752                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11753                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11754                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11755                                 req_out->list_of_streams[at] = htons(i);
11756                                 at++;
11757                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11758                                 if (at >= number_entries) {
11759                                         break;
11760                                 }
11761                         }
11762                 }
11763         } else {
11764                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11765                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11766                 }
11767         }
11768         if (SCTP_SIZE32(len) > len) {
11769                 /*-
11770                  * Need to worry about the pad we may end up adding to the
11771                  * end. This is easy since the struct is either aligned to 4
11772                  * bytes or 2 bytes off.
11773                  */
11774                 req_out->list_of_streams[number_entries] = 0;
11775         }
11776         /* now fix the chunk length */
11777         ch->chunk_length = htons(len + old_len);
11778         chk->book_size = len + old_len;
11779         chk->book_size_scale = 0;
11780         chk->send_size = SCTP_SIZE32(chk->book_size);
11781         SCTP_BUF_LEN(chk->data) = chk->send_size;
11782         return (1);
11783 }
11784
11785 static void
11786 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11787     int number_entries, uint16_t *list,
11788     uint32_t seq)
11789 {
11790         uint16_t len, old_len, i;
11791         struct sctp_stream_reset_in_request *req_in;
11792         struct sctp_chunkhdr *ch;
11793
11794         ch = mtod(chk->data, struct sctp_chunkhdr *);
11795         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11796
11797         /* get to new offset for the param. */
11798         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11799         /* now how long will this param be? */
11800         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11801         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11802         req_in->ph.param_length = htons(len);
11803         req_in->request_seq = htonl(seq);
11804         if (number_entries) {
11805                 for (i = 0; i < number_entries; i++) {
11806                         req_in->list_of_streams[i] = htons(list[i]);
11807                 }
11808         }
11809         if (SCTP_SIZE32(len) > len) {
11810                 /*-
11811                  * Need to worry about the pad we may end up adding to the
11812                  * end. This is easy since the struct is either aligned to 4
11813                  * bytes or 2 bytes off.
11814                  */
11815                 req_in->list_of_streams[number_entries] = 0;
11816         }
11817         /* now fix the chunk length */
11818         ch->chunk_length = htons(len + old_len);
11819         chk->book_size = len + old_len;
11820         chk->book_size_scale = 0;
11821         chk->send_size = SCTP_SIZE32(chk->book_size);
11822         SCTP_BUF_LEN(chk->data) = chk->send_size;
11823         return;
11824 }
11825
11826 static void
11827 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11828     uint32_t seq)
11829 {
11830         uint16_t len, old_len;
11831         struct sctp_stream_reset_tsn_request *req_tsn;
11832         struct sctp_chunkhdr *ch;
11833
11834         ch = mtod(chk->data, struct sctp_chunkhdr *);
11835         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11836
11837         /* get to new offset for the param. */
11838         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11839         /* now how long will this param be? */
11840         len = sizeof(struct sctp_stream_reset_tsn_request);
11841         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11842         req_tsn->ph.param_length = htons(len);
11843         req_tsn->request_seq = htonl(seq);
11844
11845         /* now fix the chunk length */
11846         ch->chunk_length = htons(len + old_len);
11847         chk->send_size = len + old_len;
11848         chk->book_size = SCTP_SIZE32(chk->send_size);
11849         chk->book_size_scale = 0;
11850         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11851         return;
11852 }
11853
11854 void
11855 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11856     uint32_t resp_seq, uint32_t result)
11857 {
11858         uint16_t len, old_len;
11859         struct sctp_stream_reset_response *resp;
11860         struct sctp_chunkhdr *ch;
11861
11862         ch = mtod(chk->data, struct sctp_chunkhdr *);
11863         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11864
11865         /* get to new offset for the param. */
11866         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11867         /* now how long will this param be? */
11868         len = sizeof(struct sctp_stream_reset_response);
11869         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11870         resp->ph.param_length = htons(len);
11871         resp->response_seq = htonl(resp_seq);
11872         resp->result = ntohl(result);
11873
11874         /* now fix the chunk length */
11875         ch->chunk_length = htons(len + old_len);
11876         chk->book_size = len + old_len;
11877         chk->book_size_scale = 0;
11878         chk->send_size = SCTP_SIZE32(chk->book_size);
11879         SCTP_BUF_LEN(chk->data) = chk->send_size;
11880         return;
11881 }
11882
11883 void
11884 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11885     struct sctp_stream_reset_list *ent,
11886     int response)
11887 {
11888         struct sctp_association *asoc;
11889         struct sctp_tmit_chunk *chk;
11890         struct sctp_chunkhdr *ch;
11891
11892         asoc = &stcb->asoc;
11893
11894         /*
11895          * Reset our last reset action to the new one IP -> response
11896          * (PERFORMED probably). This assures that if we fail to send, a
11897          * retran from the peer will get the new response.
11898          */
11899         asoc->last_reset_action[0] = response;
11900         if (asoc->stream_reset_outstanding) {
11901                 return;
11902         }
11903         sctp_alloc_a_chunk(stcb, chk);
11904         if (chk == NULL) {
11905                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11906                 return;
11907         }
11908         chk->copy_by_ref = 0;
11909         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11910         chk->rec.chunk_id.can_take_data = 0;
11911         chk->flags = 0;
11912         chk->asoc = &stcb->asoc;
11913         chk->book_size = sizeof(struct sctp_chunkhdr);
11914         chk->send_size = SCTP_SIZE32(chk->book_size);
11915         chk->book_size_scale = 0;
11916         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11917         if (chk->data == NULL) {
11918                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11919                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11920                 return;
11921         }
11922         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11923         /* setup chunk parameters */
11924         chk->sent = SCTP_DATAGRAM_UNSENT;
11925         chk->snd_count = 0;
11926         if (stcb->asoc.alternate) {
11927                 chk->whoTo = stcb->asoc.alternate;
11928         } else {
11929                 chk->whoTo = stcb->asoc.primary_destination;
11930         }
11931         ch = mtod(chk->data, struct sctp_chunkhdr *);
11932         ch->chunk_type = SCTP_STREAM_RESET;
11933         ch->chunk_flags = 0;
11934         ch->chunk_length = htons(chk->book_size);
11935         atomic_add_int(&chk->whoTo->ref_count, 1);
11936         SCTP_BUF_LEN(chk->data) = chk->send_size;
11937         sctp_add_stream_reset_result(chk, ent->seq, response);
11938         /* insert the chunk for sending */
11939         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11940             chk,
11941             sctp_next);
11942         asoc->ctrl_queue_cnt++;
11943 }
11944
11945 void
11946 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11947     uint32_t resp_seq, uint32_t result,
11948     uint32_t send_una, uint32_t recv_next)
11949 {
11950         uint16_t len, old_len;
11951         struct sctp_stream_reset_response_tsn *resp;
11952         struct sctp_chunkhdr *ch;
11953
11954         ch = mtod(chk->data, struct sctp_chunkhdr *);
11955         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11956
11957         /* get to new offset for the param. */
11958         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11959         /* now how long will this param be? */
11960         len = sizeof(struct sctp_stream_reset_response_tsn);
11961         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11962         resp->ph.param_length = htons(len);
11963         resp->response_seq = htonl(resp_seq);
11964         resp->result = htonl(result);
11965         resp->senders_next_tsn = htonl(send_una);
11966         resp->receivers_next_tsn = htonl(recv_next);
11967
11968         /* now fix the chunk length */
11969         ch->chunk_length = htons(len + old_len);
11970         chk->book_size = len + old_len;
11971         chk->send_size = SCTP_SIZE32(chk->book_size);
11972         chk->book_size_scale = 0;
11973         SCTP_BUF_LEN(chk->data) = chk->send_size;
11974         return;
11975 }
11976
11977 static void
11978 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11979     uint32_t seq,
11980     uint16_t adding)
11981 {
11982         uint16_t len, old_len;
11983         struct sctp_chunkhdr *ch;
11984         struct sctp_stream_reset_add_strm *addstr;
11985
11986         ch = mtod(chk->data, struct sctp_chunkhdr *);
11987         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11988
11989         /* get to new offset for the param. */
11990         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11991         /* now how long will this param be? */
11992         len = sizeof(struct sctp_stream_reset_add_strm);
11993
11994         /* Fill it out. */
11995         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11996         addstr->ph.param_length = htons(len);
11997         addstr->request_seq = htonl(seq);
11998         addstr->number_of_streams = htons(adding);
11999         addstr->reserved = 0;
12000
12001         /* now fix the chunk length */
12002         ch->chunk_length = htons(len + old_len);
12003         chk->send_size = len + old_len;
12004         chk->book_size = SCTP_SIZE32(chk->send_size);
12005         chk->book_size_scale = 0;
12006         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12007         return;
12008 }
12009
12010 static void
12011 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12012     uint32_t seq,
12013     uint16_t adding)
12014 {
12015         uint16_t len, old_len;
12016         struct sctp_chunkhdr *ch;
12017         struct sctp_stream_reset_add_strm *addstr;
12018
12019         ch = mtod(chk->data, struct sctp_chunkhdr *);
12020         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12021
12022         /* get to new offset for the param. */
12023         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12024         /* now how long will this param be? */
12025         len = sizeof(struct sctp_stream_reset_add_strm);
12026         /* Fill it out. */
12027         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12028         addstr->ph.param_length = htons(len);
12029         addstr->request_seq = htonl(seq);
12030         addstr->number_of_streams = htons(adding);
12031         addstr->reserved = 0;
12032
12033         /* now fix the chunk length */
12034         ch->chunk_length = htons(len + old_len);
12035         chk->send_size = len + old_len;
12036         chk->book_size = SCTP_SIZE32(chk->send_size);
12037         chk->book_size_scale = 0;
12038         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12039         return;
12040 }
12041
12042 int
12043 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12044 {
12045         struct sctp_association *asoc;
12046         struct sctp_tmit_chunk *chk;
12047         struct sctp_chunkhdr *ch;
12048         uint32_t seq;
12049
12050         asoc = &stcb->asoc;
12051         asoc->trigger_reset = 0;
12052         if (asoc->stream_reset_outstanding) {
12053                 return (EALREADY);
12054         }
12055         sctp_alloc_a_chunk(stcb, chk);
12056         if (chk == NULL) {
12057                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12058                 return (ENOMEM);
12059         }
12060         chk->copy_by_ref = 0;
12061         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12062         chk->rec.chunk_id.can_take_data = 0;
12063         chk->flags = 0;
12064         chk->asoc = &stcb->asoc;
12065         chk->book_size = sizeof(struct sctp_chunkhdr);
12066         chk->send_size = SCTP_SIZE32(chk->book_size);
12067         chk->book_size_scale = 0;
12068         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12069         if (chk->data == NULL) {
12070                 sctp_free_a_chunk(stcb, chk, so_locked);
12071                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12072                 return (ENOMEM);
12073         }
12074         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12075
12076         /* setup chunk parameters */
12077         chk->sent = SCTP_DATAGRAM_UNSENT;
12078         chk->snd_count = 0;
12079         if (stcb->asoc.alternate) {
12080                 chk->whoTo = stcb->asoc.alternate;
12081         } else {
12082                 chk->whoTo = stcb->asoc.primary_destination;
12083         }
12084         ch = mtod(chk->data, struct sctp_chunkhdr *);
12085         ch->chunk_type = SCTP_STREAM_RESET;
12086         ch->chunk_flags = 0;
12087         ch->chunk_length = htons(chk->book_size);
12088         atomic_add_int(&chk->whoTo->ref_count, 1);
12089         SCTP_BUF_LEN(chk->data) = chk->send_size;
12090         seq = stcb->asoc.str_reset_seq_out;
12091         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12092                 seq++;
12093                 asoc->stream_reset_outstanding++;
12094         } else {
12095                 m_freem(chk->data);
12096                 chk->data = NULL;
12097                 sctp_free_a_chunk(stcb, chk, so_locked);
12098                 return (ENOENT);
12099         }
12100         asoc->str_reset = chk;
12101         /* insert the chunk for sending */
12102         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12103             chk,
12104             sctp_next);
12105         asoc->ctrl_queue_cnt++;
12106
12107         if (stcb->asoc.send_sack) {
12108                 sctp_send_sack(stcb, so_locked);
12109         }
12110         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12111         return (0);
12112 }
12113
12114 int
12115 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12116     uint16_t number_entries, uint16_t *list,
12117     uint8_t send_in_req,
12118     uint8_t send_tsn_req,
12119     uint8_t add_stream,
12120     uint16_t adding_o,
12121     uint16_t adding_i, uint8_t peer_asked)
12122 {
12123         struct sctp_association *asoc;
12124         struct sctp_tmit_chunk *chk;
12125         struct sctp_chunkhdr *ch;
12126         int can_send_out_req = 0;
12127         uint32_t seq;
12128
12129         asoc = &stcb->asoc;
12130         if (asoc->stream_reset_outstanding) {
12131                 /*-
12132                  * Already one pending, must get ACK back to clear the flag.
12133                  */
12134                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12135                 return (EBUSY);
12136         }
12137         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12138             (add_stream == 0)) {
12139                 /* nothing to do */
12140                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12141                 return (EINVAL);
12142         }
12143         if (send_tsn_req && send_in_req) {
12144                 /* error, can't do that */
12145                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12146                 return (EINVAL);
12147         } else if (send_in_req) {
12148                 can_send_out_req = 1;
12149         }
12150         if (number_entries > (MCLBYTES -
12151             SCTP_MIN_OVERHEAD -
12152             sizeof(struct sctp_chunkhdr) -
12153             sizeof(struct sctp_stream_reset_out_request)) /
12154             sizeof(uint16_t)) {
12155                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12156                 return (ENOMEM);
12157         }
12158         sctp_alloc_a_chunk(stcb, chk);
12159         if (chk == NULL) {
12160                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12161                 return (ENOMEM);
12162         }
12163         chk->copy_by_ref = 0;
12164         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12165         chk->rec.chunk_id.can_take_data = 0;
12166         chk->flags = 0;
12167         chk->asoc = &stcb->asoc;
12168         chk->book_size = sizeof(struct sctp_chunkhdr);
12169         chk->send_size = SCTP_SIZE32(chk->book_size);
12170         chk->book_size_scale = 0;
12171         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12172         if (chk->data == NULL) {
12173                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12174                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12175                 return (ENOMEM);
12176         }
12177         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12178
12179         /* setup chunk parameters */
12180         chk->sent = SCTP_DATAGRAM_UNSENT;
12181         chk->snd_count = 0;
12182         if (stcb->asoc.alternate) {
12183                 chk->whoTo = stcb->asoc.alternate;
12184         } else {
12185                 chk->whoTo = stcb->asoc.primary_destination;
12186         }
12187         atomic_add_int(&chk->whoTo->ref_count, 1);
12188         ch = mtod(chk->data, struct sctp_chunkhdr *);
12189         ch->chunk_type = SCTP_STREAM_RESET;
12190         ch->chunk_flags = 0;
12191         ch->chunk_length = htons(chk->book_size);
12192         SCTP_BUF_LEN(chk->data) = chk->send_size;
12193
12194         seq = stcb->asoc.str_reset_seq_out;
12195         if (can_send_out_req) {
12196                 int ret;
12197
12198                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12199                 if (ret) {
12200                         seq++;
12201                         asoc->stream_reset_outstanding++;
12202                 }
12203         }
12204         if ((add_stream & 1) &&
12205             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12206                 /* Need to allocate more */
12207                 struct sctp_stream_out *oldstream;
12208                 struct sctp_stream_queue_pending *sp, *nsp;
12209                 int i;
12210 #if defined(SCTP_DETAILED_STR_STATS)
12211                 int j;
12212 #endif
12213
12214                 oldstream = stcb->asoc.strmout;
12215                 /* get some more */
12216                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12217                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12218                     SCTP_M_STRMO);
12219                 if (stcb->asoc.strmout == NULL) {
12220                         uint8_t x;
12221
12222                         stcb->asoc.strmout = oldstream;
12223                         /* Turn off the bit */
12224                         x = add_stream & 0xfe;
12225                         add_stream = x;
12226                         goto skip_stuff;
12227                 }
12228                 /*
12229                  * Ok now we proceed with copying the old out stuff and
12230                  * initializing the new stuff.
12231                  */
12232                 SCTP_TCB_SEND_LOCK(stcb);
12233                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12234                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12235                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12236                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12237                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12238                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12239                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12240                         stcb->asoc.strmout[i].sid = i;
12241                         stcb->asoc.strmout[i].state = oldstream[i].state;
12242                         /* FIX ME FIX ME */
12243                         /*
12244                          * This should be a SS_COPY operation FIX ME STREAM
12245                          * SCHEDULER EXPERT
12246                          */
12247                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12248                         /* now anything on those queues? */
12249                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12250                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12251                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12252                         }
12253
12254                 }
12255                 /* now the new streams */
12256                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12257                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12258                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12259                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12260 #if defined(SCTP_DETAILED_STR_STATS)
12261                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12262                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12263                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12264                         }
12265 #else
12266                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12267                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12268 #endif
12269                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12270                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12271                         stcb->asoc.strmout[i].sid = i;
12272                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12273                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12274                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12275                 }
12276                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12277                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12278                 SCTP_TCB_SEND_UNLOCK(stcb);
12279         }
12280 skip_stuff:
12281         if ((add_stream & 1) && (adding_o > 0)) {
12282                 asoc->strm_pending_add_size = adding_o;
12283                 asoc->peer_req_out = peer_asked;
12284                 sctp_add_an_out_stream(chk, seq, adding_o);
12285                 seq++;
12286                 asoc->stream_reset_outstanding++;
12287         }
12288         if ((add_stream & 2) && (adding_i > 0)) {
12289                 sctp_add_an_in_stream(chk, seq, adding_i);
12290                 seq++;
12291                 asoc->stream_reset_outstanding++;
12292         }
12293         if (send_in_req) {
12294                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12295                 seq++;
12296                 asoc->stream_reset_outstanding++;
12297         }
12298         if (send_tsn_req) {
12299                 sctp_add_stream_reset_tsn(chk, seq);
12300                 asoc->stream_reset_outstanding++;
12301         }
12302         asoc->str_reset = chk;
12303         /* insert the chunk for sending */
12304         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12305             chk,
12306             sctp_next);
12307         asoc->ctrl_queue_cnt++;
12308         if (stcb->asoc.send_sack) {
12309                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12310         }
12311         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12312         return (0);
12313 }
12314
12315 void
12316 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12317     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12318     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12319     uint32_t vrf_id, uint16_t port)
12320 {
12321         /* Don't respond to an ABORT with an ABORT. */
12322         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12323                 if (cause)
12324                         sctp_m_freem(cause);
12325                 return;
12326         }
12327         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12328             mflowtype, mflowid, fibnum,
12329             vrf_id, port);
12330         return;
12331 }
12332
12333 void
12334 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12335     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12336     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12337     uint32_t vrf_id, uint16_t port)
12338 {
12339         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12340             mflowtype, mflowid, fibnum,
12341             vrf_id, port);
12342         return;
12343 }
12344
12345 static struct mbuf *
12346 sctp_copy_resume(struct uio *uio,
12347     int max_send_len,
12348     int user_marks_eor,
12349     int *error,
12350     uint32_t *sndout,
12351     struct mbuf **new_tail)
12352 {
12353         struct mbuf *m;
12354
12355         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12356             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12357         if (m == NULL) {
12358                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12359                 *error = ENOBUFS;
12360         } else {
12361                 *sndout = m_length(m, NULL);
12362                 *new_tail = m_last(m);
12363         }
12364         return (m);
12365 }
12366
12367 static int
12368 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12369     struct uio *uio,
12370     int resv_upfront)
12371 {
12372         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12373             resv_upfront, 0);
12374         if (sp->data == NULL) {
12375                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12376                 return (ENOBUFS);
12377         }
12378
12379         sp->tail_mbuf = m_last(sp->data);
12380         return (0);
12381 }
12382
12383
12384
12385 static struct sctp_stream_queue_pending *
12386 sctp_copy_it_in(struct sctp_tcb *stcb,
12387     struct sctp_association *asoc,
12388     struct sctp_sndrcvinfo *srcv,
12389     struct uio *uio,
12390     struct sctp_nets *net,
12391     ssize_t max_send_len,
12392     int user_marks_eor,
12393     int *error)
12394 {
12395
12396         /*-
12397          * This routine must be very careful in its work. Protocol
12398          * processing is up and running so care must be taken to spl...()
12399          * when you need to do something that may effect the stcb/asoc. The
12400          * sb is locked however. When data is copied the protocol processing
12401          * should be enabled since this is a slower operation...
12402          */
12403         struct sctp_stream_queue_pending *sp = NULL;
12404         int resv_in_first;
12405
12406         *error = 0;
12407         /* Now can we send this? */
12408         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12409             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12410             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12411             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12412                 /* got data while shutting down */
12413                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12414                 *error = ECONNRESET;
12415                 goto out_now;
12416         }
12417         sctp_alloc_a_strmoq(stcb, sp);
12418         if (sp == NULL) {
12419                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12420                 *error = ENOMEM;
12421                 goto out_now;
12422         }
12423         sp->act_flags = 0;
12424         sp->sender_all_done = 0;
12425         sp->sinfo_flags = srcv->sinfo_flags;
12426         sp->timetolive = srcv->sinfo_timetolive;
12427         sp->ppid = srcv->sinfo_ppid;
12428         sp->context = srcv->sinfo_context;
12429         sp->fsn = 0;
12430         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12431
12432         sp->sid = srcv->sinfo_stream;
12433         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12434         if ((sp->length == (uint32_t)uio->uio_resid) &&
12435             ((user_marks_eor == 0) ||
12436             (srcv->sinfo_flags & SCTP_EOF) ||
12437             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12438                 sp->msg_is_complete = 1;
12439         } else {
12440                 sp->msg_is_complete = 0;
12441         }
12442         sp->sender_all_done = 0;
12443         sp->some_taken = 0;
12444         sp->put_last_out = 0;
12445         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12446         sp->data = sp->tail_mbuf = NULL;
12447         if (sp->length == 0) {
12448                 goto skip_copy;
12449         }
12450         if (srcv->sinfo_keynumber_valid) {
12451                 sp->auth_keyid = srcv->sinfo_keynumber;
12452         } else {
12453                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12454         }
12455         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12456                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12457                 sp->holds_key_ref = 1;
12458         }
12459         *error = sctp_copy_one(sp, uio, resv_in_first);
12460 skip_copy:
12461         if (*error) {
12462                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12463                 sp = NULL;
12464         } else {
12465                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12466                         sp->net = net;
12467                         atomic_add_int(&sp->net->ref_count, 1);
12468                 } else {
12469                         sp->net = NULL;
12470                 }
12471                 sctp_set_prsctp_policy(sp);
12472         }
12473 out_now:
12474         return (sp);
12475 }
12476
12477
12478 int
12479 sctp_sosend(struct socket *so,
12480     struct sockaddr *addr,
12481     struct uio *uio,
12482     struct mbuf *top,
12483     struct mbuf *control,
12484     int flags,
12485     struct thread *p
12486 )
12487 {
12488         int error, use_sndinfo = 0;
12489         struct sctp_sndrcvinfo sndrcvninfo;
12490         struct sockaddr *addr_to_use;
12491 #if defined(INET) && defined(INET6)
12492         struct sockaddr_in sin;
12493 #endif
12494
12495         if (control) {
12496                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12497                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12498                     sizeof(sndrcvninfo))) {
12499                         /* got one */
12500                         use_sndinfo = 1;
12501                 }
12502         }
12503         addr_to_use = addr;
12504 #if defined(INET) && defined(INET6)
12505         if ((addr) && (addr->sa_family == AF_INET6)) {
12506                 struct sockaddr_in6 *sin6;
12507
12508                 sin6 = (struct sockaddr_in6 *)addr;
12509                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12510                         in6_sin6_2_sin(&sin, sin6);
12511                         addr_to_use = (struct sockaddr *)&sin;
12512                 }
12513         }
12514 #endif
12515         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12516             control,
12517             flags,
12518             use_sndinfo ? &sndrcvninfo : NULL
12519             ,p
12520             );
12521         return (error);
12522 }
12523
12524
12525 int
12526 sctp_lower_sosend(struct socket *so,
12527     struct sockaddr *addr,
12528     struct uio *uio,
12529     struct mbuf *i_pak,
12530     struct mbuf *control,
12531     int flags,
12532     struct sctp_sndrcvinfo *srcv
12533     ,
12534     struct thread *p
12535 )
12536 {
12537         ssize_t sndlen = 0, max_len, local_add_more;
12538         int error, len;
12539         struct mbuf *top = NULL;
12540         int queue_only = 0, queue_only_for_init = 0;
12541         int free_cnt_applied = 0;
12542         int un_sent;
12543         int now_filled = 0;
12544         unsigned int inqueue_bytes = 0;
12545         struct sctp_block_entry be;
12546         struct sctp_inpcb *inp;
12547         struct sctp_tcb *stcb = NULL;
12548         struct timeval now;
12549         struct sctp_nets *net;
12550         struct sctp_association *asoc;
12551         struct sctp_inpcb *t_inp;
12552         int user_marks_eor;
12553         int create_lock_applied = 0;
12554         int nagle_applies = 0;
12555         int some_on_control = 0;
12556         int got_all_of_the_send = 0;
12557         int hold_tcblock = 0;
12558         int non_blocking = 0;
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 (flags & MSG_EOR) {
12656                 sinfo_flags |= SCTP_EOR;
12657         }
12658         if (flags & MSG_EOF) {
12659                 sinfo_flags |= SCTP_EOF;
12660         }
12661         if (sinfo_flags & SCTP_SENDALL) {
12662                 /* its a sendall */
12663                 error = sctp_sendall(inp, uio, top, srcv);
12664                 top = NULL;
12665                 goto out_unlocked;
12666         }
12667         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12668                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12669                 error = EINVAL;
12670                 goto out_unlocked;
12671         }
12672         /* now we must find the assoc */
12673         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12674             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12675                 SCTP_INP_RLOCK(inp);
12676                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12677                 if (stcb) {
12678                         SCTP_TCB_LOCK(stcb);
12679                         hold_tcblock = 1;
12680                 }
12681                 SCTP_INP_RUNLOCK(inp);
12682         } else if (sinfo_assoc_id) {
12683                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12684                 if (stcb != NULL) {
12685                         hold_tcblock = 1;
12686                 }
12687         } else if (addr) {
12688                 /*-
12689                  * Since we did not use findep we must
12690                  * increment it, and if we don't find a tcb
12691                  * decrement it.
12692                  */
12693                 SCTP_INP_WLOCK(inp);
12694                 SCTP_INP_INCR_REF(inp);
12695                 SCTP_INP_WUNLOCK(inp);
12696                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12697                 if (stcb == NULL) {
12698                         SCTP_INP_WLOCK(inp);
12699                         SCTP_INP_DECR_REF(inp);
12700                         SCTP_INP_WUNLOCK(inp);
12701                 } else {
12702                         hold_tcblock = 1;
12703                 }
12704         }
12705         if ((stcb == NULL) && (addr)) {
12706                 /* Possible implicit send? */
12707                 SCTP_ASOC_CREATE_LOCK(inp);
12708                 create_lock_applied = 1;
12709                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12710                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12711                         /* Should I really unlock ? */
12712                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12713                         error = EINVAL;
12714                         goto out_unlocked;
12715
12716                 }
12717                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12718                     (addr->sa_family == AF_INET6)) {
12719                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12720                         error = EINVAL;
12721                         goto out_unlocked;
12722                 }
12723                 SCTP_INP_WLOCK(inp);
12724                 SCTP_INP_INCR_REF(inp);
12725                 SCTP_INP_WUNLOCK(inp);
12726                 /* With the lock applied look again */
12727                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12728 #if defined(INET) || defined(INET6)
12729                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12730                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12731                 }
12732 #endif
12733                 if (stcb == NULL) {
12734                         SCTP_INP_WLOCK(inp);
12735                         SCTP_INP_DECR_REF(inp);
12736                         SCTP_INP_WUNLOCK(inp);
12737                 } else {
12738                         hold_tcblock = 1;
12739                 }
12740                 if (error) {
12741                         goto out_unlocked;
12742                 }
12743                 if (t_inp != inp) {
12744                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12745                         error = ENOTCONN;
12746                         goto out_unlocked;
12747                 }
12748         }
12749         if (stcb == NULL) {
12750                 if (addr == NULL) {
12751                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12752                         error = ENOENT;
12753                         goto out_unlocked;
12754                 } else {
12755                         /* We must go ahead and start the INIT process */
12756                         uint32_t vrf_id;
12757
12758                         if ((sinfo_flags & SCTP_ABORT) ||
12759                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12760                                 /*-
12761                                  * User asks to abort a non-existant assoc,
12762                                  * or EOF a non-existant assoc with no data
12763                                  */
12764                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12765                                 error = ENOENT;
12766                                 goto out_unlocked;
12767                         }
12768                         /* get an asoc/stcb struct */
12769                         vrf_id = inp->def_vrf_id;
12770 #ifdef INVARIANTS
12771                         if (create_lock_applied == 0) {
12772                                 panic("Error, should hold create lock and I don't?");
12773                         }
12774 #endif
12775                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12776                             inp->sctp_ep.pre_open_stream_count,
12777                             inp->sctp_ep.port,
12778                             p,
12779                             SCTP_INITIALIZE_AUTH_PARAMS);
12780                         if (stcb == NULL) {
12781                                 /* Error is setup for us in the call */
12782                                 goto out_unlocked;
12783                         }
12784                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12785                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12786                                 /*
12787                                  * Set the connected flag so we can queue
12788                                  * data
12789                                  */
12790                                 soisconnecting(so);
12791                         }
12792                         hold_tcblock = 1;
12793                         if (create_lock_applied) {
12794                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12795                                 create_lock_applied = 0;
12796                         } else {
12797                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12798                         }
12799                         /*
12800                          * Turn on queue only flag to prevent data from
12801                          * being sent
12802                          */
12803                         queue_only = 1;
12804                         asoc = &stcb->asoc;
12805                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12806                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12807
12808                         if (control) {
12809                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12810                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12811                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12812                                         hold_tcblock = 0;
12813                                         stcb = NULL;
12814                                         goto out_unlocked;
12815                                 }
12816                         }
12817                         /* out with the INIT */
12818                         queue_only_for_init = 1;
12819                         /*-
12820                          * we may want to dig in after this call and adjust the MTU
12821                          * value. It defaulted to 1500 (constant) but the ro
12822                          * structure may now have an update and thus we may need to
12823                          * change it BEFORE we append the message.
12824                          */
12825                 }
12826         } else
12827                 asoc = &stcb->asoc;
12828         if (srcv == NULL) {
12829                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12830                 sinfo_flags = srcv->sinfo_flags;
12831                 if (flags & MSG_EOR) {
12832                         sinfo_flags |= SCTP_EOR;
12833                 }
12834                 if (flags & MSG_EOF) {
12835                         sinfo_flags |= SCTP_EOF;
12836                 }
12837         }
12838         if (sinfo_flags & SCTP_ADDR_OVER) {
12839                 if (addr)
12840                         net = sctp_findnet(stcb, addr);
12841                 else
12842                         net = NULL;
12843                 if ((net == NULL) ||
12844                     ((port != 0) && (port != stcb->rport))) {
12845                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12846                         error = EINVAL;
12847                         goto out_unlocked;
12848                 }
12849         } else {
12850                 if (stcb->asoc.alternate) {
12851                         net = stcb->asoc.alternate;
12852                 } else {
12853                         net = stcb->asoc.primary_destination;
12854                 }
12855         }
12856         atomic_add_int(&stcb->total_sends, 1);
12857         /* Keep the stcb from being freed under our feet */
12858         atomic_add_int(&asoc->refcnt, 1);
12859         free_cnt_applied = 1;
12860
12861         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12862                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12863                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12864                         error = EMSGSIZE;
12865                         goto out_unlocked;
12866                 }
12867         }
12868         if (SCTP_SO_IS_NBIO(so)
12869             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12870             ) {
12871                 non_blocking = 1;
12872         }
12873         /* would we block? */
12874         if (non_blocking) {
12875                 ssize_t amount;
12876
12877                 if (hold_tcblock == 0) {
12878                         SCTP_TCB_LOCK(stcb);
12879                         hold_tcblock = 1;
12880                 }
12881                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12882                 if (user_marks_eor == 0) {
12883                         amount = sndlen;
12884                 } else {
12885                         amount = 1;
12886                 }
12887                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12888                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12889                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12890                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12891                                 error = EMSGSIZE;
12892                         else
12893                                 error = EWOULDBLOCK;
12894                         goto out_unlocked;
12895                 }
12896                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12897                 SCTP_TCB_UNLOCK(stcb);
12898                 hold_tcblock = 0;
12899         } else {
12900                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12901         }
12902         local_soresv = sndlen;
12903         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12904                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12905                 error = ECONNRESET;
12906                 goto out_unlocked;
12907         }
12908         if (create_lock_applied) {
12909                 SCTP_ASOC_CREATE_UNLOCK(inp);
12910                 create_lock_applied = 0;
12911         }
12912         /* Is the stream no. valid? */
12913         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12914                 /* Invalid stream number */
12915                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12916                 error = EINVAL;
12917                 goto out_unlocked;
12918         }
12919         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12920             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12921                 /*
12922                  * Can't queue any data while stream reset is underway.
12923                  */
12924                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12925                         error = EAGAIN;
12926                 } else {
12927                         error = EINVAL;
12928                 }
12929                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12930                 goto out_unlocked;
12931         }
12932         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12933             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12934                 queue_only = 1;
12935         }
12936         /* we are now done with all control */
12937         if (control) {
12938                 sctp_m_freem(control);
12939                 control = NULL;
12940         }
12941         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12942             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12943             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12944             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12945                 if (sinfo_flags & SCTP_ABORT) {
12946                         ;
12947                 } else {
12948                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12949                         error = ECONNRESET;
12950                         goto out_unlocked;
12951                 }
12952         }
12953         /* Ok, we will attempt a msgsnd :> */
12954         if (p) {
12955                 p->td_ru.ru_msgsnd++;
12956         }
12957         /* Are we aborting? */
12958         if (sinfo_flags & SCTP_ABORT) {
12959                 struct mbuf *mm;
12960                 ssize_t tot_demand, tot_out = 0, max_out;
12961
12962                 SCTP_STAT_INCR(sctps_sends_with_abort);
12963                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12964                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12965                         /* It has to be up before we abort */
12966                         /* how big is the user initiated abort? */
12967                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12968                         error = EINVAL;
12969                         goto out;
12970                 }
12971                 if (hold_tcblock) {
12972                         SCTP_TCB_UNLOCK(stcb);
12973                         hold_tcblock = 0;
12974                 }
12975                 if (top) {
12976                         struct mbuf *cntm = NULL;
12977
12978                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12979                         if (sndlen != 0) {
12980                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12981                                         tot_out += SCTP_BUF_LEN(cntm);
12982                                 }
12983                         }
12984                 } else {
12985                         /* Must fit in a MTU */
12986                         tot_out = sndlen;
12987                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12988                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12989                                 /* To big */
12990                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12991                                 error = EMSGSIZE;
12992                                 goto out;
12993                         }
12994                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12995                 }
12996                 if (mm == NULL) {
12997                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12998                         error = ENOMEM;
12999                         goto out;
13000                 }
13001                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13002                 max_out -= sizeof(struct sctp_abort_msg);
13003                 if (tot_out > max_out) {
13004                         tot_out = max_out;
13005                 }
13006                 if (mm) {
13007                         struct sctp_paramhdr *ph;
13008
13009                         /* now move forward the data pointer */
13010                         ph = mtod(mm, struct sctp_paramhdr *);
13011                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13012                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
13013                         ph++;
13014                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
13015                         if (top == NULL) {
13016                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13017                                 if (error) {
13018                                         /*-
13019                                          * Here if we can't get his data we
13020                                          * still abort we just don't get to
13021                                          * send the users note :-0
13022                                          */
13023                                         sctp_m_freem(mm);
13024                                         mm = NULL;
13025                                 }
13026                         } else {
13027                                 if (sndlen != 0) {
13028                                         SCTP_BUF_NEXT(mm) = top;
13029                                 }
13030                         }
13031                 }
13032                 if (hold_tcblock == 0) {
13033                         SCTP_TCB_LOCK(stcb);
13034                 }
13035                 atomic_add_int(&stcb->asoc.refcnt, -1);
13036                 free_cnt_applied = 0;
13037                 /* release this lock, otherwise we hang on ourselves */
13038                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13039                 /* now relock the stcb so everything is sane */
13040                 hold_tcblock = 0;
13041                 stcb = NULL;
13042                 /*
13043                  * In this case top is already chained to mm avoid double
13044                  * free, since we free it below if top != NULL and driver
13045                  * would free it after sending the packet out
13046                  */
13047                 if (sndlen != 0) {
13048                         top = NULL;
13049                 }
13050                 goto out_unlocked;
13051         }
13052         /* Calculate the maximum we can send */
13053         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13054         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13055                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13056         } else {
13057                 max_len = 0;
13058         }
13059         if (hold_tcblock) {
13060                 SCTP_TCB_UNLOCK(stcb);
13061                 hold_tcblock = 0;
13062         }
13063         if (asoc->strmout == NULL) {
13064                 /* huh? software error */
13065                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13066                 error = EFAULT;
13067                 goto out_unlocked;
13068         }
13069
13070         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13071         if ((user_marks_eor == 0) &&
13072             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13073                 /* It will NEVER fit */
13074                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13075                 error = EMSGSIZE;
13076                 goto out_unlocked;
13077         }
13078         if ((uio == NULL) && user_marks_eor) {
13079                 /*-
13080                  * We do not support eeor mode for
13081                  * sending with mbuf chains (like sendfile).
13082                  */
13083                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13084                 error = EINVAL;
13085                 goto out_unlocked;
13086         }
13087
13088         if (user_marks_eor) {
13089                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13090         } else {
13091                 /*-
13092                  * For non-eeor the whole message must fit in
13093                  * the socket send buffer.
13094                  */
13095                 local_add_more = sndlen;
13096         }
13097         len = 0;
13098         if (non_blocking) {
13099                 goto skip_preblock;
13100         }
13101         if (((max_len <= local_add_more) &&
13102             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13103             (max_len == 0) ||
13104             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13105                 /* No room right now ! */
13106                 SOCKBUF_LOCK(&so->so_snd);
13107                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13108                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13109                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13110                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13111                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13112                             inqueue_bytes,
13113                             local_add_more,
13114                             stcb->asoc.stream_queue_cnt,
13115                             stcb->asoc.chunks_on_out_queue,
13116                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13117                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13118                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13119                         }
13120                         be.error = 0;
13121                         stcb->block_entry = &be;
13122                         error = sbwait(&so->so_snd);
13123                         stcb->block_entry = NULL;
13124                         if (error || so->so_error || be.error) {
13125                                 if (error == 0) {
13126                                         if (so->so_error)
13127                                                 error = so->so_error;
13128                                         if (be.error) {
13129                                                 error = be.error;
13130                                         }
13131                                 }
13132                                 SOCKBUF_UNLOCK(&so->so_snd);
13133                                 goto out_unlocked;
13134                         }
13135                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13136                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13137                                     asoc, stcb->asoc.total_output_queue_size);
13138                         }
13139                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13140                                 SOCKBUF_UNLOCK(&so->so_snd);
13141                                 goto out_unlocked;
13142                         }
13143                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13144                 }
13145                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13146                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13147                 } else {
13148                         max_len = 0;
13149                 }
13150                 SOCKBUF_UNLOCK(&so->so_snd);
13151         }
13152
13153 skip_preblock:
13154         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13155                 goto out_unlocked;
13156         }
13157         /*
13158          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13159          * case NOTE: uio will be null when top/mbuf is passed
13160          */
13161         if (sndlen == 0) {
13162                 if (sinfo_flags & SCTP_EOF) {
13163                         got_all_of_the_send = 1;
13164                         goto dataless_eof;
13165                 } else {
13166                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13167                         error = EINVAL;
13168                         goto out;
13169                 }
13170         }
13171         if (top == NULL) {
13172                 struct sctp_stream_queue_pending *sp;
13173                 struct sctp_stream_out *strm;
13174                 uint32_t sndout;
13175
13176                 SCTP_TCB_SEND_LOCK(stcb);
13177                 if ((asoc->stream_locked) &&
13178                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13179                         SCTP_TCB_SEND_UNLOCK(stcb);
13180                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13181                         error = EINVAL;
13182                         goto out;
13183                 }
13184                 SCTP_TCB_SEND_UNLOCK(stcb);
13185
13186                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13187                 if (strm->last_msg_incomplete == 0) {
13188         do_a_copy_in:
13189                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13190                         if (error) {
13191                                 goto out;
13192                         }
13193                         SCTP_TCB_SEND_LOCK(stcb);
13194                         if (sp->msg_is_complete) {
13195                                 strm->last_msg_incomplete = 0;
13196                                 asoc->stream_locked = 0;
13197                         } else {
13198                                 /*
13199                                  * Just got locked to this guy in case of an
13200                                  * interrupt.
13201                                  */
13202                                 strm->last_msg_incomplete = 1;
13203                                 if (stcb->asoc.idata_supported == 0) {
13204                                         asoc->stream_locked = 1;
13205                                         asoc->stream_locked_on = srcv->sinfo_stream;
13206                                 }
13207                                 sp->sender_all_done = 0;
13208                         }
13209                         sctp_snd_sb_alloc(stcb, sp->length);
13210                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13211                         if (sinfo_flags & SCTP_UNORDERED) {
13212                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13213                         }
13214                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13215                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13216                         SCTP_TCB_SEND_UNLOCK(stcb);
13217                 } else {
13218                         SCTP_TCB_SEND_LOCK(stcb);
13219                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13220                         SCTP_TCB_SEND_UNLOCK(stcb);
13221                         if (sp == NULL) {
13222                                 /* ???? Huh ??? last msg is gone */
13223 #ifdef INVARIANTS
13224                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13225 #else
13226                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13227                                 strm->last_msg_incomplete = 0;
13228 #endif
13229                                 goto do_a_copy_in;
13230
13231                         }
13232                 }
13233                 while (uio->uio_resid > 0) {
13234                         /* How much room do we have? */
13235                         struct mbuf *new_tail, *mm;
13236
13237                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13238                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13239                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13240                         else
13241                                 max_len = 0;
13242
13243                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13244                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13245                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13246                                 sndout = 0;
13247                                 new_tail = NULL;
13248                                 if (hold_tcblock) {
13249                                         SCTP_TCB_UNLOCK(stcb);
13250                                         hold_tcblock = 0;
13251                                 }
13252                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13253                                 if ((mm == NULL) || error) {
13254                                         if (mm) {
13255                                                 sctp_m_freem(mm);
13256                                         }
13257                                         goto out;
13258                                 }
13259                                 /* Update the mbuf and count */
13260                                 SCTP_TCB_SEND_LOCK(stcb);
13261                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13262                                         /*
13263                                          * we need to get out. Peer probably
13264                                          * aborted.
13265                                          */
13266                                         sctp_m_freem(mm);
13267                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13268                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13269                                                 error = ECONNRESET;
13270                                         }
13271                                         SCTP_TCB_SEND_UNLOCK(stcb);
13272                                         goto out;
13273                                 }
13274                                 if (sp->tail_mbuf) {
13275                                         /* tack it to the end */
13276                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13277                                         sp->tail_mbuf = new_tail;
13278                                 } else {
13279                                         /* A stolen mbuf */
13280                                         sp->data = mm;
13281                                         sp->tail_mbuf = new_tail;
13282                                 }
13283                                 sctp_snd_sb_alloc(stcb, sndout);
13284                                 atomic_add_int(&sp->length, sndout);
13285                                 len += sndout;
13286                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13287                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13288                                 }
13289
13290                                 /* Did we reach EOR? */
13291                                 if ((uio->uio_resid == 0) &&
13292                                     ((user_marks_eor == 0) ||
13293                                     (sinfo_flags & SCTP_EOF) ||
13294                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13295                                         sp->msg_is_complete = 1;
13296                                 } else {
13297                                         sp->msg_is_complete = 0;
13298                                 }
13299                                 SCTP_TCB_SEND_UNLOCK(stcb);
13300                         }
13301                         if (uio->uio_resid == 0) {
13302                                 /* got it all? */
13303                                 continue;
13304                         }
13305                         /* PR-SCTP? */
13306                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13307                                 /*
13308                                  * This is ugly but we must assure locking
13309                                  * order
13310                                  */
13311                                 if (hold_tcblock == 0) {
13312                                         SCTP_TCB_LOCK(stcb);
13313                                         hold_tcblock = 1;
13314                                 }
13315                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13316                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13317                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13318                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13319                                 else
13320                                         max_len = 0;
13321                                 if (max_len > 0) {
13322                                         continue;
13323                                 }
13324                                 SCTP_TCB_UNLOCK(stcb);
13325                                 hold_tcblock = 0;
13326                         }
13327                         /* wait for space now */
13328                         if (non_blocking) {
13329                                 /* Non-blocking io in place out */
13330                                 goto skip_out_eof;
13331                         }
13332                         /* What about the INIT, send it maybe */
13333                         if (queue_only_for_init) {
13334                                 if (hold_tcblock == 0) {
13335                                         SCTP_TCB_LOCK(stcb);
13336                                         hold_tcblock = 1;
13337                                 }
13338                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13339                                         /* a collision took us forward? */
13340                                         queue_only = 0;
13341                                 } else {
13342                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13343                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13344                                         queue_only = 1;
13345                                 }
13346                         }
13347                         if ((net->flight_size > net->cwnd) &&
13348                             (asoc->sctp_cmt_on_off == 0)) {
13349                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13350                                 queue_only = 1;
13351                         } else if (asoc->ifp_had_enobuf) {
13352                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13353                                 if (net->flight_size > (2 * net->mtu)) {
13354                                         queue_only = 1;
13355                                 }
13356                                 asoc->ifp_had_enobuf = 0;
13357                         }
13358                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13359                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13360                             (stcb->asoc.total_flight > 0) &&
13361                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13362                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13363
13364                                 /*-
13365                                  * Ok, Nagle is set on and we have data outstanding.
13366                                  * Don't send anything and let SACKs drive out the
13367                                  * data unless we have a "full" segment to send.
13368                                  */
13369                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13370                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13371                                 }
13372                                 SCTP_STAT_INCR(sctps_naglequeued);
13373                                 nagle_applies = 1;
13374                         } else {
13375                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13376                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13377                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13378                                 }
13379                                 SCTP_STAT_INCR(sctps_naglesent);
13380                                 nagle_applies = 0;
13381                         }
13382                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13383
13384                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13385                                     nagle_applies, un_sent);
13386                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13387                                     stcb->asoc.total_flight,
13388                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13389                         }
13390                         if (queue_only_for_init)
13391                                 queue_only_for_init = 0;
13392                         if ((queue_only == 0) && (nagle_applies == 0)) {
13393                                 /*-
13394                                  * need to start chunk output
13395                                  * before blocking.. note that if
13396                                  * a lock is already applied, then
13397                                  * the input via the net is happening
13398                                  * and I don't need to start output :-D
13399                                  */
13400                                 if (hold_tcblock == 0) {
13401                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13402                                                 hold_tcblock = 1;
13403                                                 sctp_chunk_output(inp,
13404                                                     stcb,
13405                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13406                                         }
13407                                 } else {
13408                                         sctp_chunk_output(inp,
13409                                             stcb,
13410                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13411                                 }
13412                         }
13413                         if (hold_tcblock == 1) {
13414                                 SCTP_TCB_UNLOCK(stcb);
13415                                 hold_tcblock = 0;
13416                         }
13417                         SOCKBUF_LOCK(&so->so_snd);
13418                         /*-
13419                          * This is a bit strange, but I think it will
13420                          * work. The total_output_queue_size is locked and
13421                          * protected by the TCB_LOCK, which we just released.
13422                          * There is a race that can occur between releasing it
13423                          * above, and me getting the socket lock, where sacks
13424                          * come in but we have not put the SB_WAIT on the
13425                          * so_snd buffer to get the wakeup. After the LOCK
13426                          * is applied the sack_processing will also need to
13427                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13428                          * once we have the socket buffer lock if we recheck the
13429                          * size we KNOW we will get to sleep safely with the
13430                          * wakeup flag in place.
13431                          */
13432                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13433                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13434                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13435                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13436                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13437                                             asoc, uio->uio_resid);
13438                                 }
13439                                 be.error = 0;
13440                                 stcb->block_entry = &be;
13441                                 error = sbwait(&so->so_snd);
13442                                 stcb->block_entry = NULL;
13443
13444                                 if (error || so->so_error || be.error) {
13445                                         if (error == 0) {
13446                                                 if (so->so_error)
13447                                                         error = so->so_error;
13448                                                 if (be.error) {
13449                                                         error = be.error;
13450                                                 }
13451                                         }
13452                                         SOCKBUF_UNLOCK(&so->so_snd);
13453                                         goto out_unlocked;
13454                                 }
13455
13456                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13457                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13458                                             asoc, stcb->asoc.total_output_queue_size);
13459                                 }
13460                         }
13461                         SOCKBUF_UNLOCK(&so->so_snd);
13462                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13463                                 goto out_unlocked;
13464                         }
13465                 }
13466                 SCTP_TCB_SEND_LOCK(stcb);
13467                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13468                         SCTP_TCB_SEND_UNLOCK(stcb);
13469                         goto out_unlocked;
13470                 }
13471                 if (sp) {
13472                         if (sp->msg_is_complete == 0) {
13473                                 strm->last_msg_incomplete = 1;
13474                                 if (stcb->asoc.idata_supported == 0) {
13475                                         asoc->stream_locked = 1;
13476                                         asoc->stream_locked_on = srcv->sinfo_stream;
13477                                 }
13478                         } else {
13479                                 sp->sender_all_done = 1;
13480                                 strm->last_msg_incomplete = 0;
13481                                 asoc->stream_locked = 0;
13482                         }
13483                 } else {
13484                         SCTP_PRINTF("Huh no sp TSNH?\n");
13485                         strm->last_msg_incomplete = 0;
13486                         asoc->stream_locked = 0;
13487                 }
13488                 SCTP_TCB_SEND_UNLOCK(stcb);
13489                 if (uio->uio_resid == 0) {
13490                         got_all_of_the_send = 1;
13491                 }
13492         } else {
13493                 /* We send in a 0, since we do NOT have any locks */
13494                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13495                 top = NULL;
13496                 if (sinfo_flags & SCTP_EOF) {
13497                         /*
13498                          * This should only happen for Panda for the mbuf
13499                          * send case, which does NOT yet support EEOR mode.
13500                          * Thus, we can just set this flag to do the proper
13501                          * EOF handling.
13502                          */
13503                         got_all_of_the_send = 1;
13504                 }
13505         }
13506         if (error) {
13507                 goto out;
13508         }
13509 dataless_eof:
13510         /* EOF thing ? */
13511         if ((sinfo_flags & SCTP_EOF) &&
13512             (got_all_of_the_send == 1)) {
13513                 SCTP_STAT_INCR(sctps_sends_with_eof);
13514                 error = 0;
13515                 if (hold_tcblock == 0) {
13516                         SCTP_TCB_LOCK(stcb);
13517                         hold_tcblock = 1;
13518                 }
13519                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13520                     TAILQ_EMPTY(&asoc->sent_queue) &&
13521                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13522                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13523                                 goto abort_anyway;
13524                         }
13525                         /* there is nothing queued to send, so I'm done... */
13526                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13527                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13528                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13529                                 struct sctp_nets *netp;
13530
13531                                 /* only send SHUTDOWN the first time through */
13532                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13533                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13534                                 }
13535                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13536                                 sctp_stop_timers_for_shutdown(stcb);
13537                                 if (stcb->asoc.alternate) {
13538                                         netp = stcb->asoc.alternate;
13539                                 } else {
13540                                         netp = stcb->asoc.primary_destination;
13541                                 }
13542                                 sctp_send_shutdown(stcb, netp);
13543                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13544                                     netp);
13545                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13546                                     asoc->primary_destination);
13547                         }
13548                 } else {
13549                         /*-
13550                          * we still got (or just got) data to send, so set
13551                          * SHUTDOWN_PENDING
13552                          */
13553                         /*-
13554                          * XXX sockets draft says that SCTP_EOF should be
13555                          * sent with no data.  currently, we will allow user
13556                          * data to be sent first and move to
13557                          * SHUTDOWN-PENDING
13558                          */
13559                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13560                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13561                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13562                                 if (hold_tcblock == 0) {
13563                                         SCTP_TCB_LOCK(stcb);
13564                                         hold_tcblock = 1;
13565                                 }
13566                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13567                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13568                                 }
13569                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13570                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13571                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13572                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13573                                         struct mbuf *op_err;
13574                                         char msg[SCTP_DIAG_INFO_LEN];
13575
13576                         abort_anyway:
13577                                         if (free_cnt_applied) {
13578                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13579                                                 free_cnt_applied = 0;
13580                                         }
13581                                         snprintf(msg, sizeof(msg),
13582                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13583                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13584                                             msg);
13585                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13586                                             op_err, SCTP_SO_LOCKED);
13587                                         /*
13588                                          * now relock the stcb so everything
13589                                          * is sane
13590                                          */
13591                                         hold_tcblock = 0;
13592                                         stcb = NULL;
13593                                         goto out;
13594                                 }
13595                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13596                                     asoc->primary_destination);
13597                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13598                         }
13599                 }
13600         }
13601 skip_out_eof:
13602         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13603                 some_on_control = 1;
13604         }
13605         if (queue_only_for_init) {
13606                 if (hold_tcblock == 0) {
13607                         SCTP_TCB_LOCK(stcb);
13608                         hold_tcblock = 1;
13609                 }
13610                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13611                         /* a collision took us forward? */
13612                         queue_only = 0;
13613                 } else {
13614                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13615                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13616                         queue_only = 1;
13617                 }
13618         }
13619         if ((net->flight_size > net->cwnd) &&
13620             (stcb->asoc.sctp_cmt_on_off == 0)) {
13621                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13622                 queue_only = 1;
13623         } else if (asoc->ifp_had_enobuf) {
13624                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13625                 if (net->flight_size > (2 * net->mtu)) {
13626                         queue_only = 1;
13627                 }
13628                 asoc->ifp_had_enobuf = 0;
13629         }
13630         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13631         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13632             (stcb->asoc.total_flight > 0) &&
13633             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13634             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13635                 /*-
13636                  * Ok, Nagle is set on and we have data outstanding.
13637                  * Don't send anything and let SACKs drive out the
13638                  * data unless wen have a "full" segment to send.
13639                  */
13640                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13641                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13642                 }
13643                 SCTP_STAT_INCR(sctps_naglequeued);
13644                 nagle_applies = 1;
13645         } else {
13646                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13647                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13648                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13649                 }
13650                 SCTP_STAT_INCR(sctps_naglesent);
13651                 nagle_applies = 0;
13652         }
13653         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13654                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13655                     nagle_applies, un_sent);
13656                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13657                     stcb->asoc.total_flight,
13658                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13659         }
13660         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13661                 /* we can attempt to send too. */
13662                 if (hold_tcblock == 0) {
13663                         /*
13664                          * If there is activity recv'ing sacks no need to
13665                          * send
13666                          */
13667                         if (SCTP_TCB_TRYLOCK(stcb)) {
13668                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13669                                 hold_tcblock = 1;
13670                         }
13671                 } else {
13672                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13673                 }
13674         } else if ((queue_only == 0) &&
13675                     (stcb->asoc.peers_rwnd == 0) &&
13676             (stcb->asoc.total_flight == 0)) {
13677                 /* We get to have a probe outstanding */
13678                 if (hold_tcblock == 0) {
13679                         hold_tcblock = 1;
13680                         SCTP_TCB_LOCK(stcb);
13681                 }
13682                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13683         } else if (some_on_control) {
13684                 int num_out, reason, frag_point;
13685
13686                 /* Here we do control only */
13687                 if (hold_tcblock == 0) {
13688                         hold_tcblock = 1;
13689                         SCTP_TCB_LOCK(stcb);
13690                 }
13691                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13692                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13693                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13694         }
13695         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13696             queue_only, stcb->asoc.peers_rwnd, un_sent,
13697             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13698             stcb->asoc.total_output_queue_size, error);
13699
13700 out:
13701 out_unlocked:
13702
13703         if (local_soresv && stcb) {
13704                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13705         }
13706         if (create_lock_applied) {
13707                 SCTP_ASOC_CREATE_UNLOCK(inp);
13708         }
13709         if ((stcb) && hold_tcblock) {
13710                 SCTP_TCB_UNLOCK(stcb);
13711         }
13712         if (stcb && free_cnt_applied) {
13713                 atomic_add_int(&stcb->asoc.refcnt, -1);
13714         }
13715 #ifdef INVARIANTS
13716         if (stcb) {
13717                 if (mtx_owned(&stcb->tcb_mtx)) {
13718                         panic("Leaving with tcb mtx owned?");
13719                 }
13720                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13721                         panic("Leaving with tcb send mtx owned?");
13722                 }
13723         }
13724 #endif
13725         if (top) {
13726                 sctp_m_freem(top);
13727         }
13728         if (control) {
13729                 sctp_m_freem(control);
13730         }
13731         return (error);
13732 }
13733
13734
13735 /*
13736  * generate an AUTHentication chunk, if required
13737  */
13738 struct mbuf *
13739 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13740     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13741     struct sctp_tcb *stcb, uint8_t chunk)
13742 {
13743         struct mbuf *m_auth;
13744         struct sctp_auth_chunk *auth;
13745         int chunk_len;
13746         struct mbuf *cn;
13747
13748         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13749             (stcb == NULL))
13750                 return (m);
13751
13752         if (stcb->asoc.auth_supported == 0) {
13753                 return (m);
13754         }
13755         /* does the requested chunk require auth? */
13756         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13757                 return (m);
13758         }
13759         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13760         if (m_auth == NULL) {
13761                 /* no mbuf's */
13762                 return (m);
13763         }
13764         /* reserve some space if this will be the first mbuf */
13765         if (m == NULL)
13766                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13767         /* fill in the AUTH chunk details */
13768         auth = mtod(m_auth, struct sctp_auth_chunk *);
13769         memset(auth, 0, sizeof(*auth));
13770         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13771         auth->ch.chunk_flags = 0;
13772         chunk_len = sizeof(*auth) +
13773             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13774         auth->ch.chunk_length = htons(chunk_len);
13775         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13776         /* key id and hmac digest will be computed and filled in upon send */
13777
13778         /* save the offset where the auth was inserted into the chain */
13779         *offset = 0;
13780         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13781                 *offset += SCTP_BUF_LEN(cn);
13782         }
13783
13784         /* update length and return pointer to the auth chunk */
13785         SCTP_BUF_LEN(m_auth) = chunk_len;
13786         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13787         if (auth_ret != NULL)
13788                 *auth_ret = auth;
13789
13790         return (m);
13791 }
13792
13793 #ifdef INET6
13794 int
13795 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13796 {
13797         struct nd_prefix *pfx = NULL;
13798         struct nd_pfxrouter *pfxrtr = NULL;
13799         struct sockaddr_in6 gw6;
13800
13801         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13802                 return (0);
13803
13804         /* get prefix entry of address */
13805         ND6_RLOCK();
13806         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13807                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13808                         continue;
13809                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13810                     &src6->sin6_addr, &pfx->ndpr_mask))
13811                         break;
13812         }
13813         /* no prefix entry in the prefix list */
13814         if (pfx == NULL) {
13815                 ND6_RUNLOCK();
13816                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13817                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13818                 return (0);
13819         }
13820
13821         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13822         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13823
13824         /* search installed gateway from prefix entry */
13825         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13826                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13827                 gw6.sin6_family = AF_INET6;
13828                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13829                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13830                     sizeof(struct in6_addr));
13831                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13832                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13833                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13834                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13835                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13836                         ND6_RUNLOCK();
13837                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13838                         return (1);
13839                 }
13840         }
13841         ND6_RUNLOCK();
13842         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13843         return (0);
13844 }
13845 #endif
13846
13847 int
13848 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13849 {
13850 #ifdef INET
13851         struct sockaddr_in *sin, *mask;
13852         struct ifaddr *ifa;
13853         struct in_addr srcnetaddr, gwnetaddr;
13854
13855         if (ro == NULL || ro->ro_rt == NULL ||
13856             sifa->address.sa.sa_family != AF_INET) {
13857                 return (0);
13858         }
13859         ifa = (struct ifaddr *)sifa->ifa;
13860         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13861         sin = &sifa->address.sin;
13862         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13863         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13864         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13865         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13866
13867         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13868         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13869         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13870         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13871         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13872         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13873                 return (1);
13874         }
13875 #endif
13876         return (0);
13877 }