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 ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4293                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4294                                                 }
4295                                                 net->mtu = mtu;
4296                                         }
4297                                 } else if (ro->ro_rt == NULL) {
4298                                         /* route was freed */
4299                                         if (net->ro._s_addr &&
4300                                             net->src_addr_selected) {
4301                                                 sctp_free_ifa(net->ro._s_addr);
4302                                                 net->ro._s_addr = NULL;
4303                                         }
4304                                         net->src_addr_selected = 0;
4305                                 }
4306                         }
4307                         return (ret);
4308                 }
4309 #endif
4310 #ifdef INET6
4311         case AF_INET6:
4312                 {
4313                         uint32_t flowlabel, flowinfo;
4314                         struct ip6_hdr *ip6h;
4315                         struct route_in6 ip6route;
4316                         struct ifnet *ifp;
4317                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4318                         int prev_scope = 0;
4319                         struct sockaddr_in6 lsa6_storage;
4320                         int error;
4321                         u_short prev_port = 0;
4322                         int len;
4323
4324                         if (net) {
4325                                 flowlabel = net->flowlabel;
4326                         } else if (stcb) {
4327                                 flowlabel = stcb->asoc.default_flowlabel;
4328                         } else {
4329                                 flowlabel = inp->sctp_ep.default_flowlabel;
4330                         }
4331                         if (flowlabel == 0) {
4332                                 /*
4333                                  * This means especially, that it is not set
4334                                  * at the SCTP layer. So use the value from
4335                                  * the IP layer.
4336                                  */
4337                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4338                         }
4339                         flowlabel &= 0x000fffff;
4340                         len = SCTP_MIN_OVERHEAD;
4341                         if (port) {
4342                                 len += sizeof(struct udphdr);
4343                         }
4344                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4345                         if (newm == NULL) {
4346                                 sctp_m_freem(m);
4347                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4348                                 return (ENOMEM);
4349                         }
4350                         SCTP_ALIGN_TO_END(newm, len);
4351                         SCTP_BUF_LEN(newm) = len;
4352                         SCTP_BUF_NEXT(newm) = m;
4353                         m = newm;
4354                         if (net != NULL) {
4355                                 m->m_pkthdr.flowid = net->flowid;
4356                                 M_HASHTYPE_SET(m, net->flowtype);
4357                         } else {
4358                                 m->m_pkthdr.flowid = mflowid;
4359                                 M_HASHTYPE_SET(m, mflowtype);
4360                         }
4361                         packet_length = sctp_calculate_len(m);
4362
4363                         ip6h = mtod(m, struct ip6_hdr *);
4364                         /* protect *sin6 from overwrite */
4365                         sin6 = (struct sockaddr_in6 *)to;
4366                         tmp = *sin6;
4367                         sin6 = &tmp;
4368
4369                         /* KAME hack: embed scopeid */
4370                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4371                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4372                                 sctp_m_freem(m);
4373                                 return (EINVAL);
4374                         }
4375                         if (net == NULL) {
4376                                 memset(&ip6route, 0, sizeof(ip6route));
4377                                 ro = (sctp_route_t *)&ip6route;
4378                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4379                         } else {
4380                                 ro = (sctp_route_t *)&net->ro;
4381                         }
4382                         /*
4383                          * We assume here that inp_flow is in host byte
4384                          * order within the TCB!
4385                          */
4386                         if (tos_value == 0) {
4387                                 /*
4388                                  * This means especially, that it is not set
4389                                  * at the SCTP layer. So use the value from
4390                                  * the IP layer.
4391                                  */
4392                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4393                         }
4394                         tos_value &= 0xfc;
4395                         if (ecn_ok) {
4396                                 tos_value |= sctp_get_ect(stcb);
4397                         }
4398                         flowinfo = 0x06;
4399                         flowinfo <<= 8;
4400                         flowinfo |= tos_value;
4401                         flowinfo <<= 20;
4402                         flowinfo |= flowlabel;
4403                         ip6h->ip6_flow = htonl(flowinfo);
4404                         if (port) {
4405                                 ip6h->ip6_nxt = IPPROTO_UDP;
4406                         } else {
4407                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4408                         }
4409                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4410                         ip6h->ip6_dst = sin6->sin6_addr;
4411
4412                         /*
4413                          * Add SRC address selection here: we can only reuse
4414                          * to a limited degree the kame src-addr-sel, since
4415                          * we can try their selection but it may not be
4416                          * bound.
4417                          */
4418                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4419                         lsa6_tmp.sin6_family = AF_INET6;
4420                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4421                         lsa6 = &lsa6_tmp;
4422                         if (net && out_of_asoc_ok == 0) {
4423                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4424                                         sctp_free_ifa(net->ro._s_addr);
4425                                         net->ro._s_addr = NULL;
4426                                         net->src_addr_selected = 0;
4427                                         if (ro->ro_rt) {
4428                                                 RTFREE(ro->ro_rt);
4429                                                 ro->ro_rt = NULL;
4430                                         }
4431                                 }
4432                                 if (net->src_addr_selected == 0) {
4433                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4434                                         /* KAME hack: embed scopeid */
4435                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4436                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4437                                                 sctp_m_freem(m);
4438                                                 return (EINVAL);
4439                                         }
4440                                         /* Cache the source address */
4441                                         net->ro._s_addr = sctp_source_address_selection(inp,
4442                                             stcb,
4443                                             ro,
4444                                             net,
4445                                             0,
4446                                             vrf_id);
4447                                         (void)sa6_recoverscope(sin6);
4448                                         net->src_addr_selected = 1;
4449                                 }
4450                                 if (net->ro._s_addr == NULL) {
4451                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4452                                         net->src_addr_selected = 0;
4453                                         sctp_handle_no_route(stcb, net, so_locked);
4454                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4455                                         sctp_m_freem(m);
4456                                         return (EHOSTUNREACH);
4457                                 }
4458                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4459                         } else {
4460                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4461                                 /* KAME hack: embed scopeid */
4462                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4463                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4464                                         sctp_m_freem(m);
4465                                         return (EINVAL);
4466                                 }
4467                                 if (over_addr == NULL) {
4468                                         struct sctp_ifa *_lsrc;
4469
4470                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4471                                             net,
4472                                             out_of_asoc_ok,
4473                                             vrf_id);
4474                                         if (_lsrc == NULL) {
4475                                                 sctp_handle_no_route(stcb, net, so_locked);
4476                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4477                                                 sctp_m_freem(m);
4478                                                 return (EHOSTUNREACH);
4479                                         }
4480                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4481                                         sctp_free_ifa(_lsrc);
4482                                 } else {
4483                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4484                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4485                                 }
4486                                 (void)sa6_recoverscope(sin6);
4487                         }
4488                         lsa6->sin6_port = inp->sctp_lport;
4489
4490                         if (ro->ro_rt == NULL) {
4491                                 /*
4492                                  * src addr selection failed to find a route
4493                                  * (or valid source addr), so we can't get
4494                                  * there from here!
4495                                  */
4496                                 sctp_handle_no_route(stcb, net, so_locked);
4497                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4498                                 sctp_m_freem(m);
4499                                 return (EHOSTUNREACH);
4500                         }
4501                         /*
4502                          * XXX: sa6 may not have a valid sin6_scope_id in
4503                          * the non-SCOPEDROUTING case.
4504                          */
4505                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4506                         lsa6_storage.sin6_family = AF_INET6;
4507                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4508                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4509                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4510                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4511                                 sctp_m_freem(m);
4512                                 return (error);
4513                         }
4514                         /* XXX */
4515                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4516                         lsa6_storage.sin6_port = inp->sctp_lport;
4517                         lsa6 = &lsa6_storage;
4518                         ip6h->ip6_src = lsa6->sin6_addr;
4519
4520                         if (port) {
4521                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4522                                         sctp_handle_no_route(stcb, net, so_locked);
4523                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4524                                         sctp_m_freem(m);
4525                                         return (EHOSTUNREACH);
4526                                 }
4527                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4528                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4529                                 udp->uh_dport = port;
4530                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4531                                 udp->uh_sum = 0;
4532                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4533                         } else {
4534                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4535                         }
4536
4537                         sctphdr->src_port = src_port;
4538                         sctphdr->dest_port = dest_port;
4539                         sctphdr->v_tag = v_tag;
4540                         sctphdr->checksum = 0;
4541
4542                         /*
4543                          * We set the hop limit now since there is a good
4544                          * chance that our ro pointer is now filled
4545                          */
4546                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4547                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4548
4549 #ifdef SCTP_DEBUG
4550                         /* Copy to be sure something bad is not happening */
4551                         sin6->sin6_addr = ip6h->ip6_dst;
4552                         lsa6->sin6_addr = ip6h->ip6_src;
4553 #endif
4554
4555                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4556                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4557                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4558                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4559                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4560                         if (net) {
4561                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4562                                 /*
4563                                  * preserve the port and scope for link
4564                                  * local send
4565                                  */
4566                                 prev_scope = sin6->sin6_scope_id;
4567                                 prev_port = sin6->sin6_port;
4568                         }
4569
4570                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4571                                 /* failed to prepend data, give up */
4572                                 sctp_m_freem(m);
4573                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4574                                 return (ENOMEM);
4575                         }
4576                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4577                         if (port) {
4578                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4579                                 SCTP_STAT_INCR(sctps_sendswcrc);
4580                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4581                                         udp->uh_sum = 0xffff;
4582                                 }
4583                         } else {
4584                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4585                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4586                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4587                         }
4588                         /* send it out. table id is taken from stcb */
4589 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4590                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4591                                 so = SCTP_INP_SO(inp);
4592                                 SCTP_SOCKET_UNLOCK(so, 0);
4593                         }
4594 #endif
4595 #ifdef SCTP_PACKET_LOGGING
4596                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4597                                 sctp_packet_log(o_pak);
4598 #endif
4599                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4600                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4601 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4602                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4603                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4604                                 SCTP_TCB_UNLOCK(stcb);
4605                                 SCTP_SOCKET_LOCK(so, 0);
4606                                 SCTP_TCB_LOCK(stcb);
4607                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4608                         }
4609 #endif
4610                         if (net) {
4611                                 /* for link local this must be done */
4612                                 sin6->sin6_scope_id = prev_scope;
4613                                 sin6->sin6_port = prev_port;
4614                         }
4615                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4616                         if (port) {
4617                                 UDPSTAT_INC(udps_opackets);
4618                         }
4619                         SCTP_STAT_INCR(sctps_sendpackets);
4620                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4621                         if (ret) {
4622                                 SCTP_STAT_INCR(sctps_senderrors);
4623                         }
4624                         if (net == NULL) {
4625                                 /* Now if we had a temp route free it */
4626                                 RO_RTFREE(ro);
4627                         } else {
4628                                 /*
4629                                  * PMTU check versus smallest asoc MTU goes
4630                                  * here
4631                                  */
4632                                 if (ro->ro_rt == NULL) {
4633                                         /* Route was freed */
4634                                         if (net->ro._s_addr &&
4635                                             net->src_addr_selected) {
4636                                                 sctp_free_ifa(net->ro._s_addr);
4637                                                 net->ro._s_addr = NULL;
4638                                         }
4639                                         net->src_addr_selected = 0;
4640                                 }
4641                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4642                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4643                                         uint32_t mtu;
4644
4645                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4646                                         if (mtu > 0) {
4647                                                 if (net->port) {
4648                                                         mtu -= sizeof(struct udphdr);
4649                                                 }
4650                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4651                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4652                                                 }
4653                                                 net->mtu = mtu;
4654                                         }
4655                                 } else if (ifp) {
4656                                         if (ND_IFINFO(ifp)->linkmtu &&
4657                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4658                                                 sctp_mtu_size_reset(inp,
4659                                                     &stcb->asoc,
4660                                                     ND_IFINFO(ifp)->linkmtu);
4661                                         }
4662                                 }
4663                         }
4664                         return (ret);
4665                 }
4666 #endif
4667         default:
4668                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4669                     ((struct sockaddr *)to)->sa_family);
4670                 sctp_m_freem(m);
4671                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4672                 return (EFAULT);
4673         }
4674 }
4675
4676
4677 void
4678 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4679 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4680     SCTP_UNUSED
4681 #endif
4682 )
4683 {
4684         struct mbuf *m, *m_last;
4685         struct sctp_nets *net;
4686         struct sctp_init_chunk *init;
4687         struct sctp_supported_addr_param *sup_addr;
4688         struct sctp_adaptation_layer_indication *ali;
4689         struct sctp_supported_chunk_types_param *pr_supported;
4690         struct sctp_paramhdr *ph;
4691         int cnt_inits_to = 0;
4692         int error;
4693         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4694
4695         /* INIT's always go to the primary (and usually ONLY address) */
4696         net = stcb->asoc.primary_destination;
4697         if (net == NULL) {
4698                 net = TAILQ_FIRST(&stcb->asoc.nets);
4699                 if (net == NULL) {
4700                         /* TSNH */
4701                         return;
4702                 }
4703                 /* we confirm any address we send an INIT to */
4704                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4705                 (void)sctp_set_primary_addr(stcb, NULL, net);
4706         } else {
4707                 /* we confirm any address we send an INIT to */
4708                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4709         }
4710         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4711 #ifdef INET6
4712         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4713                 /*
4714                  * special hook, if we are sending to link local it will not
4715                  * show up in our private address count.
4716                  */
4717                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4718                         cnt_inits_to = 1;
4719         }
4720 #endif
4721         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4722                 /* This case should not happen */
4723                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4724                 return;
4725         }
4726         /* start the INIT timer */
4727         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4728
4729         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4730         if (m == NULL) {
4731                 /* No memory, INIT timer will re-attempt. */
4732                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4733                 return;
4734         }
4735         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4736         padding_len = 0;
4737         /* Now lets put the chunk header in place */
4738         init = mtod(m, struct sctp_init_chunk *);
4739         /* now the chunk header */
4740         init->ch.chunk_type = SCTP_INITIATION;
4741         init->ch.chunk_flags = 0;
4742         /* fill in later from mbuf we build */
4743         init->ch.chunk_length = 0;
4744         /* place in my tag */
4745         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4746         /* set up some of the credits. */
4747         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4748             SCTP_MINIMAL_RWND));
4749         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4750         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4751         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4752
4753         /* Adaptation layer indication parameter */
4754         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4755                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4756                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4757                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4758                 ali->ph.param_length = htons(parameter_len);
4759                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4760                 chunk_len += parameter_len;
4761         }
4762
4763         /* ECN parameter */
4764         if (stcb->asoc.ecn_supported == 1) {
4765                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4766                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4767                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4768                 ph->param_length = htons(parameter_len);
4769                 chunk_len += parameter_len;
4770         }
4771
4772         /* PR-SCTP supported parameter */
4773         if (stcb->asoc.prsctp_supported == 1) {
4774                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4775                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4776                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4777                 ph->param_length = htons(parameter_len);
4778                 chunk_len += parameter_len;
4779         }
4780
4781         /* Add NAT friendly parameter. */
4782         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4783                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4784                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4785                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4786                 ph->param_length = htons(parameter_len);
4787                 chunk_len += parameter_len;
4788         }
4789
4790         /* And now tell the peer which extensions we support */
4791         num_ext = 0;
4792         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4793         if (stcb->asoc.prsctp_supported == 1) {
4794                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4795                 if (stcb->asoc.idata_supported) {
4796                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4797                 }
4798         }
4799         if (stcb->asoc.auth_supported == 1) {
4800                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4801         }
4802         if (stcb->asoc.asconf_supported == 1) {
4803                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4804                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4805         }
4806         if (stcb->asoc.reconfig_supported == 1) {
4807                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4808         }
4809         if (stcb->asoc.idata_supported) {
4810                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4811         }
4812         if (stcb->asoc.nrsack_supported == 1) {
4813                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4814         }
4815         if (stcb->asoc.pktdrop_supported == 1) {
4816                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4817         }
4818         if (num_ext > 0) {
4819                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4820                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4821                 pr_supported->ph.param_length = htons(parameter_len);
4822                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4823                 chunk_len += parameter_len;
4824         }
4825         /* add authentication parameters */
4826         if (stcb->asoc.auth_supported) {
4827                 /* attach RANDOM parameter, if available */
4828                 if (stcb->asoc.authinfo.random != NULL) {
4829                         struct sctp_auth_random *randp;
4830
4831                         if (padding_len > 0) {
4832                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4833                                 chunk_len += padding_len;
4834                                 padding_len = 0;
4835                         }
4836                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4837                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4838                         /* random key already contains the header */
4839                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4840                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4841                         chunk_len += parameter_len;
4842                 }
4843                 /* add HMAC_ALGO parameter */
4844                 if (stcb->asoc.local_hmacs != NULL) {
4845                         struct sctp_auth_hmac_algo *hmacs;
4846
4847                         if (padding_len > 0) {
4848                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4849                                 chunk_len += padding_len;
4850                                 padding_len = 0;
4851                         }
4852                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4853                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4854                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4855                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4856                         hmacs->ph.param_length = htons(parameter_len);
4857                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4858                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4859                         chunk_len += parameter_len;
4860                 }
4861                 /* add CHUNKS parameter */
4862                 if (stcb->asoc.local_auth_chunks != NULL) {
4863                         struct sctp_auth_chunk_list *chunks;
4864
4865                         if (padding_len > 0) {
4866                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4867                                 chunk_len += padding_len;
4868                                 padding_len = 0;
4869                         }
4870                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4871                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4872                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4873                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4874                         chunks->ph.param_length = htons(parameter_len);
4875                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4876                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4877                         chunk_len += parameter_len;
4878                 }
4879         }
4880
4881         /* now any cookie time extensions */
4882         if (stcb->asoc.cookie_preserve_req) {
4883                 struct sctp_cookie_perserve_param *cookie_preserve;
4884
4885                 if (padding_len > 0) {
4886                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4887                         chunk_len += padding_len;
4888                         padding_len = 0;
4889                 }
4890                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4891                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4892                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4893                 cookie_preserve->ph.param_length = htons(parameter_len);
4894                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4895                 stcb->asoc.cookie_preserve_req = 0;
4896                 chunk_len += parameter_len;
4897         }
4898
4899         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4900                 uint8_t i;
4901
4902                 if (padding_len > 0) {
4903                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4904                         chunk_len += padding_len;
4905                         padding_len = 0;
4906                 }
4907                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4908                 if (stcb->asoc.scope.ipv4_addr_legal) {
4909                         parameter_len += (uint16_t)sizeof(uint16_t);
4910                 }
4911                 if (stcb->asoc.scope.ipv6_addr_legal) {
4912                         parameter_len += (uint16_t)sizeof(uint16_t);
4913                 }
4914                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4915                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4916                 sup_addr->ph.param_length = htons(parameter_len);
4917                 i = 0;
4918                 if (stcb->asoc.scope.ipv4_addr_legal) {
4919                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4920                 }
4921                 if (stcb->asoc.scope.ipv6_addr_legal) {
4922                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4923                 }
4924                 padding_len = 4 - 2 * i;
4925                 chunk_len += parameter_len;
4926         }
4927
4928         SCTP_BUF_LEN(m) = chunk_len;
4929         /* now the addresses */
4930         /*
4931          * To optimize this we could put the scoping stuff into a structure
4932          * and remove the individual uint8's from the assoc structure. Then
4933          * we could just sifa in the address within the stcb. But for now
4934          * this is a quick hack to get the address stuff teased apart.
4935          */
4936         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4937             m, cnt_inits_to,
4938             &padding_len, &chunk_len);
4939
4940         init->ch.chunk_length = htons(chunk_len);
4941         if (padding_len > 0) {
4942                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4943                         sctp_m_freem(m);
4944                         return;
4945                 }
4946         }
4947         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4948         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4949             (struct sockaddr *)&net->ro._l_addr,
4950             m, 0, NULL, 0, 0, 0, 0,
4951             inp->sctp_lport, stcb->rport, htonl(0),
4952             net->port, NULL,
4953             0, 0,
4954             so_locked))) {
4955                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4956                 if (error == ENOBUFS) {
4957                         stcb->asoc.ifp_had_enobuf = 1;
4958                         SCTP_STAT_INCR(sctps_lowlevelerr);
4959                 }
4960         } else {
4961                 stcb->asoc.ifp_had_enobuf = 0;
4962         }
4963         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4964         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4965 }
4966
4967 struct mbuf *
4968 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4969     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4970 {
4971         /*
4972          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4973          * being equal to the beginning of the params i.e. (iphlen +
4974          * sizeof(struct sctp_init_msg) parse through the parameters to the
4975          * end of the mbuf verifying that all parameters are known.
4976          *
4977          * For unknown parameters build and return a mbuf with
4978          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4979          * processing this chunk stop, and set *abort_processing to 1.
4980          *
4981          * By having param_offset be pre-set to where parameters begin it is
4982          * hoped that this routine may be reused in the future by new
4983          * features.
4984          */
4985         struct sctp_paramhdr *phdr, params;
4986
4987         struct mbuf *mat, *op_err;
4988         int at, limit, pad_needed;
4989         uint16_t ptype, plen, padded_size;
4990         int err_at;
4991
4992         *abort_processing = 0;
4993         mat = in_initpkt;
4994         err_at = 0;
4995         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4996         at = param_offset;
4997         op_err = NULL;
4998         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4999         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5000         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5001                 ptype = ntohs(phdr->param_type);
5002                 plen = ntohs(phdr->param_length);
5003                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5004                         /* wacked parameter */
5005                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5006                         goto invalid_size;
5007                 }
5008                 limit -= SCTP_SIZE32(plen);
5009                 /*-
5010                  * All parameters for all chunks that we know/understand are
5011                  * listed here. We process them other places and make
5012                  * appropriate stop actions per the upper bits. However this
5013                  * is the generic routine processor's can call to get back
5014                  * an operr.. to either incorporate (init-ack) or send.
5015                  */
5016                 padded_size = SCTP_SIZE32(plen);
5017                 switch (ptype) {
5018                         /* Param's with variable size */
5019                 case SCTP_HEARTBEAT_INFO:
5020                 case SCTP_STATE_COOKIE:
5021                 case SCTP_UNRECOG_PARAM:
5022                 case SCTP_ERROR_CAUSE_IND:
5023                         /* ok skip fwd */
5024                         at += padded_size;
5025                         break;
5026                         /* Param's with variable size within a range */
5027                 case SCTP_CHUNK_LIST:
5028                 case SCTP_SUPPORTED_CHUNK_EXT:
5029                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5030                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5031                                 goto invalid_size;
5032                         }
5033                         at += padded_size;
5034                         break;
5035                 case SCTP_SUPPORTED_ADDRTYPE:
5036                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5037                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5038                                 goto invalid_size;
5039                         }
5040                         at += padded_size;
5041                         break;
5042                 case SCTP_RANDOM:
5043                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5044                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5045                                 goto invalid_size;
5046                         }
5047                         at += padded_size;
5048                         break;
5049                 case SCTP_SET_PRIM_ADDR:
5050                 case SCTP_DEL_IP_ADDRESS:
5051                 case SCTP_ADD_IP_ADDRESS:
5052                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5053                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5054                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5055                                 goto invalid_size;
5056                         }
5057                         at += padded_size;
5058                         break;
5059                         /* Param's with a fixed size */
5060                 case SCTP_IPV4_ADDRESS:
5061                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5062                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5063                                 goto invalid_size;
5064                         }
5065                         at += padded_size;
5066                         break;
5067                 case SCTP_IPV6_ADDRESS:
5068                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5069                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5070                                 goto invalid_size;
5071                         }
5072                         at += padded_size;
5073                         break;
5074                 case SCTP_COOKIE_PRESERVE:
5075                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5076                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5077                                 goto invalid_size;
5078                         }
5079                         at += padded_size;
5080                         break;
5081                 case SCTP_HAS_NAT_SUPPORT:
5082                         *nat_friendly = 1;
5083                         /* fall through */
5084                 case SCTP_PRSCTP_SUPPORTED:
5085                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5086                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5087                                 goto invalid_size;
5088                         }
5089                         at += padded_size;
5090                         break;
5091                 case SCTP_ECN_CAPABLE:
5092                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5093                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5094                                 goto invalid_size;
5095                         }
5096                         at += padded_size;
5097                         break;
5098                 case SCTP_ULP_ADAPTATION:
5099                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5100                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5101                                 goto invalid_size;
5102                         }
5103                         at += padded_size;
5104                         break;
5105                 case SCTP_SUCCESS_REPORT:
5106                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5107                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5108                                 goto invalid_size;
5109                         }
5110                         at += padded_size;
5111                         break;
5112                 case SCTP_HOSTNAME_ADDRESS:
5113                         {
5114                                 /* We can NOT handle HOST NAME addresses!! */
5115                                 int l_len;
5116
5117                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5118                                 *abort_processing = 1;
5119                                 if (op_err == NULL) {
5120                                         /* Ok need to try to get a mbuf */
5121 #ifdef INET6
5122                                         l_len = SCTP_MIN_OVERHEAD;
5123 #else
5124                                         l_len = SCTP_MIN_V4_OVERHEAD;
5125 #endif
5126                                         l_len += sizeof(struct sctp_chunkhdr);
5127                                         l_len += sizeof(struct sctp_gen_error_cause);
5128                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5129                                         if (op_err) {
5130                                                 SCTP_BUF_LEN(op_err) = 0;
5131                                                 /*
5132                                                  * Pre-reserve space for IP,
5133                                                  * SCTP, and chunk header.
5134                                                  */
5135 #ifdef INET6
5136                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5137 #else
5138                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5139 #endif
5140                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5141                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5142                                         }
5143                                 }
5144                                 if (op_err) {
5145                                         /* If we have space */
5146                                         struct sctp_gen_error_cause cause;
5147
5148                                         if (err_at % 4) {
5149                                                 uint32_t cpthis = 0;
5150
5151                                                 pad_needed = 4 - (err_at % 4);
5152                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5153                                                 err_at += pad_needed;
5154                                         }
5155                                         cause.code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5156                                         cause.length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5157                                         m_copyback(op_err, err_at, sizeof(struct sctp_gen_error_cause), (caddr_t)&cause);
5158                                         err_at += sizeof(struct sctp_gen_error_cause);
5159                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5160                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5161                                                 sctp_m_freem(op_err);
5162                                                 return (NULL);
5163                                         }
5164                                 }
5165                                 return (op_err);
5166                                 break;
5167                         }
5168                 default:
5169                         /*
5170                          * we do not recognize the parameter figure out what
5171                          * we do.
5172                          */
5173                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5174                         if ((ptype & 0x4000) == 0x4000) {
5175                                 /* Report bit is set?? */
5176                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5177                                 if (op_err == NULL) {
5178                                         int l_len;
5179
5180                                         /* Ok need to try to get an mbuf */
5181 #ifdef INET6
5182                                         l_len = SCTP_MIN_OVERHEAD;
5183 #else
5184                                         l_len = SCTP_MIN_V4_OVERHEAD;
5185 #endif
5186                                         l_len += sizeof(struct sctp_chunkhdr);
5187                                         l_len += sizeof(struct sctp_paramhdr);
5188                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5189                                         if (op_err) {
5190                                                 SCTP_BUF_LEN(op_err) = 0;
5191 #ifdef INET6
5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5193 #else
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5195 #endif
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5197                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5198                                         }
5199                                 }
5200                                 if (op_err) {
5201                                         /* If we have space */
5202                                         struct sctp_paramhdr s;
5203
5204                                         if (err_at % 4) {
5205                                                 uint32_t cpthis = 0;
5206
5207                                                 pad_needed = 4 - (err_at % 4);
5208                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5209                                                 err_at += pad_needed;
5210                                         }
5211                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5212                                         s.param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5213                                         m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)&s);
5214                                         err_at += sizeof(struct sctp_paramhdr);
5215                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5216                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5217                                                 sctp_m_freem(op_err);
5218                                                 /*
5219                                                  * we are out of memory but
5220                                                  * we still need to have a
5221                                                  * look at what to do (the
5222                                                  * system is in trouble
5223                                                  * though).
5224                                                  */
5225                                                 op_err = NULL;
5226                                                 goto more_processing;
5227                                         }
5228                                         err_at += plen;
5229                                 }
5230                         }
5231         more_processing:
5232                         if ((ptype & 0x8000) == 0x0000) {
5233                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5234                                 return (op_err);
5235                         } else {
5236                                 /* skip this chunk and continue processing */
5237                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5238                                 at += SCTP_SIZE32(plen);
5239                         }
5240                         break;
5241
5242                 }
5243                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5244         }
5245         return (op_err);
5246 invalid_size:
5247         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5248         *abort_processing = 1;
5249         if ((op_err == NULL) && phdr) {
5250                 int l_len;
5251 #ifdef INET6
5252                 l_len = SCTP_MIN_OVERHEAD;
5253 #else
5254                 l_len = SCTP_MIN_V4_OVERHEAD;
5255 #endif
5256                 l_len += sizeof(struct sctp_chunkhdr);
5257                 l_len += (2 * sizeof(struct sctp_paramhdr));
5258                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5259                 if (op_err) {
5260                         SCTP_BUF_LEN(op_err) = 0;
5261 #ifdef INET6
5262                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5263 #else
5264                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5265 #endif
5266                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5268                 }
5269         }
5270         if ((op_err) && phdr) {
5271                 struct sctp_paramhdr s;
5272
5273                 if (err_at % 4) {
5274                         uint32_t cpthis = 0;
5275
5276                         pad_needed = 4 - (err_at % 4);
5277                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5278                         err_at += pad_needed;
5279                 }
5280                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5281                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5282                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5283                 err_at += sizeof(s);
5284                 /* Only copy back the p-hdr that caused the issue */
5285                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5286         }
5287         return (op_err);
5288 }
5289
5290 static int
5291 sctp_are_there_new_addresses(struct sctp_association *asoc,
5292     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5293 {
5294         /*
5295          * Given a INIT packet, look through the packet to verify that there
5296          * are NO new addresses. As we go through the parameters add reports
5297          * of any un-understood parameters that require an error.  Also we
5298          * must return (1) to drop the packet if we see a un-understood
5299          * parameter that tells us to drop the chunk.
5300          */
5301         struct sockaddr *sa_touse;
5302         struct sockaddr *sa;
5303         struct sctp_paramhdr *phdr, params;
5304         uint16_t ptype, plen;
5305         uint8_t fnd;
5306         struct sctp_nets *net;
5307         int check_src;
5308 #ifdef INET
5309         struct sockaddr_in sin4, *sa4;
5310 #endif
5311 #ifdef INET6
5312         struct sockaddr_in6 sin6, *sa6;
5313 #endif
5314
5315 #ifdef INET
5316         memset(&sin4, 0, sizeof(sin4));
5317         sin4.sin_family = AF_INET;
5318         sin4.sin_len = sizeof(sin4);
5319 #endif
5320 #ifdef INET6
5321         memset(&sin6, 0, sizeof(sin6));
5322         sin6.sin6_family = AF_INET6;
5323         sin6.sin6_len = sizeof(sin6);
5324 #endif
5325         /* First what about the src address of the pkt ? */
5326         check_src = 0;
5327         switch (src->sa_family) {
5328 #ifdef INET
5329         case AF_INET:
5330                 if (asoc->scope.ipv4_addr_legal) {
5331                         check_src = 1;
5332                 }
5333                 break;
5334 #endif
5335 #ifdef INET6
5336         case AF_INET6:
5337                 if (asoc->scope.ipv6_addr_legal) {
5338                         check_src = 1;
5339                 }
5340                 break;
5341 #endif
5342         default:
5343                 /* TSNH */
5344                 break;
5345         }
5346         if (check_src) {
5347                 fnd = 0;
5348                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5349                         sa = (struct sockaddr *)&net->ro._l_addr;
5350                         if (sa->sa_family == src->sa_family) {
5351 #ifdef INET
5352                                 if (sa->sa_family == AF_INET) {
5353                                         struct sockaddr_in *src4;
5354
5355                                         sa4 = (struct sockaddr_in *)sa;
5356                                         src4 = (struct sockaddr_in *)src;
5357                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5358                                                 fnd = 1;
5359                                                 break;
5360                                         }
5361                                 }
5362 #endif
5363 #ifdef INET6
5364                                 if (sa->sa_family == AF_INET6) {
5365                                         struct sockaddr_in6 *src6;
5366
5367                                         sa6 = (struct sockaddr_in6 *)sa;
5368                                         src6 = (struct sockaddr_in6 *)src;
5369                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5370                                                 fnd = 1;
5371                                                 break;
5372                                         }
5373                                 }
5374 #endif
5375                         }
5376                 }
5377                 if (fnd == 0) {
5378                         /* New address added! no need to look further. */
5379                         return (1);
5380                 }
5381         }
5382         /* Ok so far lets munge through the rest of the packet */
5383         offset += sizeof(struct sctp_init_chunk);
5384         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5385         while (phdr) {
5386                 sa_touse = NULL;
5387                 ptype = ntohs(phdr->param_type);
5388                 plen = ntohs(phdr->param_length);
5389                 switch (ptype) {
5390 #ifdef INET
5391                 case SCTP_IPV4_ADDRESS:
5392                         {
5393                                 struct sctp_ipv4addr_param *p4, p4_buf;
5394
5395                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5396                                         return (1);
5397                                 }
5398                                 phdr = sctp_get_next_param(in_initpkt, offset,
5399                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5400                                 if (phdr == NULL) {
5401                                         return (1);
5402                                 }
5403                                 if (asoc->scope.ipv4_addr_legal) {
5404                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5405                                         sin4.sin_addr.s_addr = p4->addr;
5406                                         sa_touse = (struct sockaddr *)&sin4;
5407                                 }
5408                                 break;
5409                         }
5410 #endif
5411 #ifdef INET6
5412                 case SCTP_IPV6_ADDRESS:
5413                         {
5414                                 struct sctp_ipv6addr_param *p6, p6_buf;
5415
5416                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5417                                         return (1);
5418                                 }
5419                                 phdr = sctp_get_next_param(in_initpkt, offset,
5420                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5421                                 if (phdr == NULL) {
5422                                         return (1);
5423                                 }
5424                                 if (asoc->scope.ipv6_addr_legal) {
5425                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5426                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5427                                             sizeof(p6->addr));
5428                                         sa_touse = (struct sockaddr *)&sin6;
5429                                 }
5430                                 break;
5431                         }
5432 #endif
5433                 default:
5434                         sa_touse = NULL;
5435                         break;
5436                 }
5437                 if (sa_touse) {
5438                         /* ok, sa_touse points to one to check */
5439                         fnd = 0;
5440                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5441                                 sa = (struct sockaddr *)&net->ro._l_addr;
5442                                 if (sa->sa_family != sa_touse->sa_family) {
5443                                         continue;
5444                                 }
5445 #ifdef INET
5446                                 if (sa->sa_family == AF_INET) {
5447                                         sa4 = (struct sockaddr_in *)sa;
5448                                         if (sa4->sin_addr.s_addr ==
5449                                             sin4.sin_addr.s_addr) {
5450                                                 fnd = 1;
5451                                                 break;
5452                                         }
5453                                 }
5454 #endif
5455 #ifdef INET6
5456                                 if (sa->sa_family == AF_INET6) {
5457                                         sa6 = (struct sockaddr_in6 *)sa;
5458                                         if (SCTP6_ARE_ADDR_EQUAL(
5459                                             sa6, &sin6)) {
5460                                                 fnd = 1;
5461                                                 break;
5462                                         }
5463                                 }
5464 #endif
5465                         }
5466                         if (!fnd) {
5467                                 /* New addr added! no need to look further */
5468                                 return (1);
5469                         }
5470                 }
5471                 offset += SCTP_SIZE32(plen);
5472                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5473         }
5474         return (0);
5475 }
5476
5477 /*
5478  * Given a MBUF chain that was sent into us containing an INIT. Build a
5479  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5480  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5481  * message (i.e. the struct sctp_init_msg).
5482  */
5483 void
5484 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5485     struct sctp_nets *src_net, struct mbuf *init_pkt,
5486     int iphlen, int offset,
5487     struct sockaddr *src, struct sockaddr *dst,
5488     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5489     uint8_t mflowtype, uint32_t mflowid,
5490     uint32_t vrf_id, uint16_t port)
5491 {
5492         struct sctp_association *asoc;
5493         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5494         struct sctp_init_ack_chunk *initack;
5495         struct sctp_adaptation_layer_indication *ali;
5496         struct sctp_supported_chunk_types_param *pr_supported;
5497         struct sctp_paramhdr *ph;
5498         union sctp_sockstore *over_addr;
5499         struct sctp_scoping scp;
5500         struct timeval now;
5501 #ifdef INET
5502         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5503         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5504         struct sockaddr_in *sin;
5505 #endif
5506 #ifdef INET6
5507         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5508         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5509         struct sockaddr_in6 *sin6;
5510 #endif
5511         struct sockaddr *to;
5512         struct sctp_state_cookie stc;
5513         struct sctp_nets *net = NULL;
5514         uint8_t *signature = NULL;
5515         int cnt_inits_to = 0;
5516         uint16_t his_limit, i_want;
5517         int abort_flag;
5518         int nat_friendly = 0;
5519         int error;
5520         struct socket *so;
5521         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5522
5523         if (stcb) {
5524                 asoc = &stcb->asoc;
5525         } else {
5526                 asoc = NULL;
5527         }
5528         if ((asoc != NULL) &&
5529             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5530                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5531                         /*
5532                          * new addresses, out of here in non-cookie-wait
5533                          * states
5534                          *
5535                          * Send an ABORT, without the new address error
5536                          * cause. This looks no different than if no
5537                          * listener was present.
5538                          */
5539                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5540                             "Address added");
5541                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5542                             mflowtype, mflowid, inp->fibnum,
5543                             vrf_id, port);
5544                         return;
5545                 }
5546                 if (src_net != NULL && (src_net->port != port)) {
5547                         /*
5548                          * change of remote encapsulation port, out of here
5549                          * in non-cookie-wait states
5550                          *
5551                          * Send an ABORT, without an specific error cause.
5552                          * This looks no different than if no listener was
5553                          * present.
5554                          */
5555                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556                             "Remote encapsulation port changed");
5557                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5558                             mflowtype, mflowid, inp->fibnum,
5559                             vrf_id, port);
5560                         return;
5561                 }
5562         }
5563         abort_flag = 0;
5564         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5565             (offset + sizeof(struct sctp_init_chunk)),
5566             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5567         if (abort_flag) {
5568 do_a_abort:
5569                 if (op_err == NULL) {
5570                         char msg[SCTP_DIAG_INFO_LEN];
5571
5572                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5573                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5574                             msg);
5575                 }
5576                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5577                     init_chk->init.initiate_tag, op_err,
5578                     mflowtype, mflowid, inp->fibnum,
5579                     vrf_id, port);
5580                 return;
5581         }
5582         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5583         if (m == NULL) {
5584                 /* No memory, INIT timer will re-attempt. */
5585                 if (op_err)
5586                         sctp_m_freem(op_err);
5587                 return;
5588         }
5589         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5590         padding_len = 0;
5591
5592         /*
5593          * We might not overwrite the identification[] completely and on
5594          * some platforms time_entered will contain some padding. Therefore
5595          * zero out the cookie to avoid putting uninitialized memory on the
5596          * wire.
5597          */
5598         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5599
5600         /* the time I built cookie */
5601         (void)SCTP_GETTIME_TIMEVAL(&now);
5602         stc.time_entered.tv_sec = now.tv_sec;
5603         stc.time_entered.tv_usec = now.tv_usec;
5604
5605         /* populate any tie tags */
5606         if (asoc != NULL) {
5607                 /* unlock before tag selections */
5608                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5609                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5610                 stc.cookie_life = asoc->cookie_life;
5611                 net = asoc->primary_destination;
5612         } else {
5613                 stc.tie_tag_my_vtag = 0;
5614                 stc.tie_tag_peer_vtag = 0;
5615                 /* life I will award this cookie */
5616                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5617         }
5618
5619         /* copy in the ports for later check */
5620         stc.myport = sh->dest_port;
5621         stc.peerport = sh->src_port;
5622
5623         /*
5624          * If we wanted to honor cookie life extensions, we would add to
5625          * stc.cookie_life. For now we should NOT honor any extension
5626          */
5627         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5628         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5629                 stc.ipv6_addr_legal = 1;
5630                 if (SCTP_IPV6_V6ONLY(inp)) {
5631                         stc.ipv4_addr_legal = 0;
5632                 } else {
5633                         stc.ipv4_addr_legal = 1;
5634                 }
5635         } else {
5636                 stc.ipv6_addr_legal = 0;
5637                 stc.ipv4_addr_legal = 1;
5638         }
5639         stc.ipv4_scope = 0;
5640         if (net == NULL) {
5641                 to = src;
5642                 switch (dst->sa_family) {
5643 #ifdef INET
5644                 case AF_INET:
5645                         {
5646                                 /* lookup address */
5647                                 stc.address[0] = src4->sin_addr.s_addr;
5648                                 stc.address[1] = 0;
5649                                 stc.address[2] = 0;
5650                                 stc.address[3] = 0;
5651                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5652                                 /* local from address */
5653                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5654                                 stc.laddress[1] = 0;
5655                                 stc.laddress[2] = 0;
5656                                 stc.laddress[3] = 0;
5657                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5658                                 /* scope_id is only for v6 */
5659                                 stc.scope_id = 0;
5660                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5661                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5662                                         stc.ipv4_scope = 1;
5663                                 }
5664                                 /* Must use the address in this case */
5665                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5666                                         stc.loopback_scope = 1;
5667                                         stc.ipv4_scope = 1;
5668                                         stc.site_scope = 1;
5669                                         stc.local_scope = 0;
5670                                 }
5671                                 break;
5672                         }
5673 #endif
5674 #ifdef INET6
5675                 case AF_INET6:
5676                         {
5677                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5678                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5679                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5680                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5681                                         stc.loopback_scope = 1;
5682                                         stc.local_scope = 0;
5683                                         stc.site_scope = 1;
5684                                         stc.ipv4_scope = 1;
5685                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5686                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5687                                         /*
5688                                          * If the new destination or source
5689                                          * is a LINK_LOCAL we must have
5690                                          * common both site and local scope.
5691                                          * Don't set local scope though
5692                                          * since we must depend on the
5693                                          * source to be added implicitly. We
5694                                          * cannot assure just because we
5695                                          * share one link that all links are
5696                                          * common.
5697                                          */
5698                                         stc.local_scope = 0;
5699                                         stc.site_scope = 1;
5700                                         stc.ipv4_scope = 1;
5701                                         /*
5702                                          * we start counting for the private
5703                                          * address stuff at 1. since the
5704                                          * link local we source from won't
5705                                          * show up in our scoped count.
5706                                          */
5707                                         cnt_inits_to = 1;
5708                                         /*
5709                                          * pull out the scope_id from
5710                                          * incoming pkt
5711                                          */
5712                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5713                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5714                                         /*
5715                                          * If the new destination or source
5716                                          * is SITE_LOCAL then we must have
5717                                          * site scope in common.
5718                                          */
5719                                         stc.site_scope = 1;
5720                                 }
5721                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5722                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5723                                 break;
5724                         }
5725 #endif
5726                 default:
5727                         /* TSNH */
5728                         goto do_a_abort;
5729                         break;
5730                 }
5731         } else {
5732                 /* set the scope per the existing tcb */
5733
5734 #ifdef INET6
5735                 struct sctp_nets *lnet;
5736 #endif
5737
5738                 stc.loopback_scope = asoc->scope.loopback_scope;
5739                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5740                 stc.site_scope = asoc->scope.site_scope;
5741                 stc.local_scope = asoc->scope.local_scope;
5742 #ifdef INET6
5743                 /* Why do we not consider IPv4 LL addresses? */
5744                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5745                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5746                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5747                                         /*
5748                                          * if we have a LL address, start
5749                                          * counting at 1.
5750                                          */
5751                                         cnt_inits_to = 1;
5752                                 }
5753                         }
5754                 }
5755 #endif
5756                 /* use the net pointer */
5757                 to = (struct sockaddr *)&net->ro._l_addr;
5758                 switch (to->sa_family) {
5759 #ifdef INET
5760                 case AF_INET:
5761                         sin = (struct sockaddr_in *)to;
5762                         stc.address[0] = sin->sin_addr.s_addr;
5763                         stc.address[1] = 0;
5764                         stc.address[2] = 0;
5765                         stc.address[3] = 0;
5766                         stc.addr_type = SCTP_IPV4_ADDRESS;
5767                         if (net->src_addr_selected == 0) {
5768                                 /*
5769                                  * strange case here, the INIT should have
5770                                  * did the selection.
5771                                  */
5772                                 net->ro._s_addr = sctp_source_address_selection(inp,
5773                                     stcb, (sctp_route_t *)&net->ro,
5774                                     net, 0, vrf_id);
5775                                 if (net->ro._s_addr == NULL)
5776                                         return;
5777
5778                                 net->src_addr_selected = 1;
5779
5780                         }
5781                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5782                         stc.laddress[1] = 0;
5783                         stc.laddress[2] = 0;
5784                         stc.laddress[3] = 0;
5785                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5786                         /* scope_id is only for v6 */
5787                         stc.scope_id = 0;
5788                         break;
5789 #endif
5790 #ifdef INET6
5791                 case AF_INET6:
5792                         sin6 = (struct sockaddr_in6 *)to;
5793                         memcpy(&stc.address, &sin6->sin6_addr,
5794                             sizeof(struct in6_addr));
5795                         stc.addr_type = SCTP_IPV6_ADDRESS;
5796                         stc.scope_id = sin6->sin6_scope_id;
5797                         if (net->src_addr_selected == 0) {
5798                                 /*
5799                                  * strange case here, the INIT should have
5800                                  * done the selection.
5801                                  */
5802                                 net->ro._s_addr = sctp_source_address_selection(inp,
5803                                     stcb, (sctp_route_t *)&net->ro,
5804                                     net, 0, vrf_id);
5805                                 if (net->ro._s_addr == NULL)
5806                                         return;
5807
5808                                 net->src_addr_selected = 1;
5809                         }
5810                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5811                             sizeof(struct in6_addr));
5812                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5813                         break;
5814 #endif
5815                 }
5816         }
5817         /* Now lets put the SCTP header in place */
5818         initack = mtod(m, struct sctp_init_ack_chunk *);
5819         /* Save it off for quick ref */
5820         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5821         /* who are we */
5822         memcpy(stc.identification, SCTP_VERSION_STRING,
5823             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5824         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5825         /* now the chunk header */
5826         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5827         initack->ch.chunk_flags = 0;
5828         /* fill in later from mbuf we build */
5829         initack->ch.chunk_length = 0;
5830         /* place in my tag */
5831         if ((asoc != NULL) &&
5832             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5833             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5834             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5835                 /* re-use the v-tags and init-seq here */
5836                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5837                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5838         } else {
5839                 uint32_t vtag, itsn;
5840
5841                 if (asoc) {
5842                         atomic_add_int(&asoc->refcnt, 1);
5843                         SCTP_TCB_UNLOCK(stcb);
5844         new_tag:
5845                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5846                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5847                                 /*
5848                                  * Got a duplicate vtag on some guy behind a
5849                                  * nat make sure we don't use it.
5850                                  */
5851                                 goto new_tag;
5852                         }
5853                         initack->init.initiate_tag = htonl(vtag);
5854                         /* get a TSN to use too */
5855                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5856                         initack->init.initial_tsn = htonl(itsn);
5857                         SCTP_TCB_LOCK(stcb);
5858                         atomic_add_int(&asoc->refcnt, -1);
5859                 } else {
5860                         SCTP_INP_INCR_REF(inp);
5861                         SCTP_INP_RUNLOCK(inp);
5862                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5863                         initack->init.initiate_tag = htonl(vtag);
5864                         /* get a TSN to use too */
5865                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5866                         SCTP_INP_RLOCK(inp);
5867                         SCTP_INP_DECR_REF(inp);
5868                 }
5869         }
5870         /* save away my tag to */
5871         stc.my_vtag = initack->init.initiate_tag;
5872
5873         /* set up some of the credits. */
5874         so = inp->sctp_socket;
5875         if (so == NULL) {
5876                 /* memory problem */
5877                 sctp_m_freem(m);
5878                 return;
5879         } else {
5880                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5881         }
5882         /* set what I want */
5883         his_limit = ntohs(init_chk->init.num_inbound_streams);
5884         /* choose what I want */
5885         if (asoc != NULL) {
5886                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5887                         i_want = asoc->streamoutcnt;
5888                 } else {
5889                         i_want = asoc->pre_open_streams;
5890                 }
5891         } else {
5892                 i_want = inp->sctp_ep.pre_open_stream_count;
5893         }
5894         if (his_limit < i_want) {
5895                 /* I Want more :< */
5896                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5897         } else {
5898                 /* I can have what I want :> */
5899                 initack->init.num_outbound_streams = htons(i_want);
5900         }
5901         /* tell him his limit. */
5902         initack->init.num_inbound_streams =
5903             htons(inp->sctp_ep.max_open_streams_intome);
5904
5905         /* adaptation layer indication parameter */
5906         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5907                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5908                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5909                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5910                 ali->ph.param_length = htons(parameter_len);
5911                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5912                 chunk_len += parameter_len;
5913         }
5914
5915         /* ECN parameter */
5916         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5917             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5918                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5919                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5920                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5921                 ph->param_length = htons(parameter_len);
5922                 chunk_len += parameter_len;
5923         }
5924
5925         /* PR-SCTP supported parameter */
5926         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5927             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5928                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5929                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5930                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5931                 ph->param_length = htons(parameter_len);
5932                 chunk_len += parameter_len;
5933         }
5934
5935         /* Add NAT friendly parameter */
5936         if (nat_friendly) {
5937                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5938                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5939                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5940                 ph->param_length = htons(parameter_len);
5941                 chunk_len += parameter_len;
5942         }
5943
5944         /* And now tell the peer which extensions we support */
5945         num_ext = 0;
5946         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5947         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5948             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5949                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5950                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5951                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5952                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5953                 }
5954         }
5955         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5956             ((asoc == NULL) && (inp->auth_supported == 1))) {
5957                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5958         }
5959         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5960             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5962                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5963         }
5964         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5965             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5966                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5967         }
5968         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5969             ((asoc == NULL) && (inp->idata_supported == 1))) {
5970                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5971         }
5972         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5973             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5974                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5975         }
5976         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5977             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5978                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5979         }
5980         if (num_ext > 0) {
5981                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5982                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5983                 pr_supported->ph.param_length = htons(parameter_len);
5984                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5985                 chunk_len += parameter_len;
5986         }
5987
5988         /* add authentication parameters */
5989         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5990             ((asoc == NULL) && (inp->auth_supported == 1))) {
5991                 struct sctp_auth_random *randp;
5992                 struct sctp_auth_hmac_algo *hmacs;
5993                 struct sctp_auth_chunk_list *chunks;
5994
5995                 if (padding_len > 0) {
5996                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5997                         chunk_len += padding_len;
5998                         padding_len = 0;
5999                 }
6000                 /* generate and add RANDOM parameter */
6001                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6002                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6003                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6004                 randp->ph.param_type = htons(SCTP_RANDOM);
6005                 randp->ph.param_length = htons(parameter_len);
6006                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6007                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6008                 chunk_len += parameter_len;
6009
6010                 if (padding_len > 0) {
6011                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6012                         chunk_len += padding_len;
6013                         padding_len = 0;
6014                 }
6015                 /* add HMAC_ALGO parameter */
6016                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6017                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6018                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6019                     (uint8_t *)hmacs->hmac_ids);
6020                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6021                 hmacs->ph.param_length = htons(parameter_len);
6022                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6023                 chunk_len += parameter_len;
6024
6025                 if (padding_len > 0) {
6026                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6027                         chunk_len += padding_len;
6028                         padding_len = 0;
6029                 }
6030                 /* add CHUNKS parameter */
6031                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6032                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6033                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6034                     chunks->chunk_types);
6035                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6036                 chunks->ph.param_length = htons(parameter_len);
6037                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6038                 chunk_len += parameter_len;
6039         }
6040         SCTP_BUF_LEN(m) = chunk_len;
6041         m_last = m;
6042         /* now the addresses */
6043         /*
6044          * To optimize this we could put the scoping stuff into a structure
6045          * and remove the individual uint8's from the stc structure. Then we
6046          * could just sifa in the address within the stc.. but for now this
6047          * is a quick hack to get the address stuff teased apart.
6048          */
6049         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6050         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6051         scp.loopback_scope = stc.loopback_scope;
6052         scp.ipv4_local_scope = stc.ipv4_scope;
6053         scp.local_scope = stc.local_scope;
6054         scp.site_scope = stc.site_scope;
6055         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6056             cnt_inits_to,
6057             &padding_len, &chunk_len);
6058         /* padding_len can only be positive, if no addresses have been added */
6059         if (padding_len > 0) {
6060                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6061                 chunk_len += padding_len;
6062                 SCTP_BUF_LEN(m) += padding_len;
6063                 padding_len = 0;
6064         }
6065
6066         /* tack on the operational error if present */
6067         if (op_err) {
6068                 parameter_len = 0;
6069                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6070                         parameter_len += SCTP_BUF_LEN(m_tmp);
6071                 }
6072                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6073                 SCTP_BUF_NEXT(m_last) = op_err;
6074                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6075                         m_last = SCTP_BUF_NEXT(m_last);
6076                 }
6077                 chunk_len += parameter_len;
6078         }
6079         if (padding_len > 0) {
6080                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6081                 if (m_last == NULL) {
6082                         /* Houston we have a problem, no space */
6083                         sctp_m_freem(m);
6084                         return;
6085                 }
6086                 chunk_len += padding_len;
6087                 padding_len = 0;
6088         }
6089         /* Now we must build a cookie */
6090         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6091         if (m_cookie == NULL) {
6092                 /* memory problem */
6093                 sctp_m_freem(m);
6094                 return;
6095         }
6096         /* Now append the cookie to the end and update the space/size */
6097         SCTP_BUF_NEXT(m_last) = m_cookie;
6098         parameter_len = 0;
6099         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6100                 parameter_len += SCTP_BUF_LEN(m_tmp);
6101                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6102                         m_last = m_tmp;
6103                 }
6104         }
6105         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6106         chunk_len += parameter_len;
6107
6108         /*
6109          * Place in the size, but we don't include the last pad (if any) in
6110          * the INIT-ACK.
6111          */
6112         initack->ch.chunk_length = htons(chunk_len);
6113
6114         /*
6115          * Time to sign the cookie, we don't sign over the cookie signature
6116          * though thus we set trailer.
6117          */
6118         (void)sctp_hmac_m(SCTP_HMAC,
6119             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6120             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6121             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6122         /*
6123          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6124          * here since the timer will drive a retranmission.
6125          */
6126         if (padding_len > 0) {
6127                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6128                         sctp_m_freem(m);
6129                         return;
6130                 }
6131         }
6132         if (stc.loopback_scope) {
6133                 over_addr = (union sctp_sockstore *)dst;
6134         } else {
6135                 over_addr = NULL;
6136         }
6137
6138         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6139             0, 0,
6140             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6141             port, over_addr,
6142             mflowtype, mflowid,
6143             SCTP_SO_NOT_LOCKED))) {
6144                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6145                 if (error == ENOBUFS) {
6146                         if (asoc != NULL) {
6147                                 asoc->ifp_had_enobuf = 1;
6148                         }
6149                         SCTP_STAT_INCR(sctps_lowlevelerr);
6150                 }
6151         } else {
6152                 if (asoc != NULL) {
6153                         asoc->ifp_had_enobuf = 0;
6154                 }
6155         }
6156         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6157 }
6158
6159
6160 static void
6161 sctp_prune_prsctp(struct sctp_tcb *stcb,
6162     struct sctp_association *asoc,
6163     struct sctp_sndrcvinfo *srcv,
6164     int dataout)
6165 {
6166         int freed_spc = 0;
6167         struct sctp_tmit_chunk *chk, *nchk;
6168
6169         SCTP_TCB_LOCK_ASSERT(stcb);
6170         if ((asoc->prsctp_supported) &&
6171             (asoc->sent_queue_cnt_removeable > 0)) {
6172                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6173                         /*
6174                          * Look for chunks marked with the PR_SCTP flag AND
6175                          * the buffer space flag. If the one being sent is
6176                          * equal or greater priority then purge the old one
6177                          * and free some space.
6178                          */
6179                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6180                                 /*
6181                                  * This one is PR-SCTP AND buffer space
6182                                  * limited type
6183                                  */
6184                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6185                                         /*
6186                                          * Lower numbers equates to higher
6187                                          * priority so if the one we are
6188                                          * looking at has a larger or equal
6189                                          * priority we want to drop the data
6190                                          * and NOT retransmit it.
6191                                          */
6192                                         if (chk->data) {
6193                                                 /*
6194                                                  * We release the book_size
6195                                                  * if the mbuf is here
6196                                                  */
6197                                                 int ret_spc;
6198                                                 uint8_t sent;
6199
6200                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6201                                                         sent = 1;
6202                                                 else
6203                                                         sent = 0;
6204                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6205                                                     sent,
6206                                                     SCTP_SO_LOCKED);
6207                                                 freed_spc += ret_spc;
6208                                                 if (freed_spc >= dataout) {
6209                                                         return;
6210                                                 }
6211                                         }       /* if chunk was present */
6212                                 }       /* if of sufficient priority */
6213                         }       /* if chunk has enabled */
6214                 }               /* tailqforeach */
6215
6216                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6217                         /* Here we must move to the sent queue and mark */
6218                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6219                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6220                                         if (chk->data) {
6221                                                 /*
6222                                                  * We release the book_size
6223                                                  * if the mbuf is here
6224                                                  */
6225                                                 int ret_spc;
6226
6227                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6228                                                     0, SCTP_SO_LOCKED);
6229
6230                                                 freed_spc += ret_spc;
6231                                                 if (freed_spc >= dataout) {
6232                                                         return;
6233                                                 }
6234                                         }       /* end if chk->data */
6235                                 }       /* end if right class */
6236                         }       /* end if chk pr-sctp */
6237                 }               /* tailqforeachsafe (chk) */
6238         }                       /* if enabled in asoc */
6239 }
6240
6241 int
6242 sctp_get_frag_point(struct sctp_tcb *stcb,
6243     struct sctp_association *asoc)
6244 {
6245         int siz, ovh;
6246
6247         /*
6248          * For endpoints that have both v6 and v4 addresses we must reserve
6249          * room for the ipv6 header, for those that are only dealing with V4
6250          * we use a larger frag point.
6251          */
6252         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6253                 ovh = SCTP_MIN_OVERHEAD;
6254         } else {
6255                 ovh = SCTP_MIN_V4_OVERHEAD;
6256         }
6257         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6258         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6259                 siz = asoc->smallest_mtu - ovh;
6260         else
6261                 siz = (stcb->asoc.sctp_frag_point - ovh);
6262         /*
6263          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6264          */
6265         /* A data chunk MUST fit in a cluster */
6266         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6267         /* } */
6268
6269         /* adjust for an AUTH chunk if DATA requires auth */
6270         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6271                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6272
6273         if (siz % 4) {
6274                 /* make it an even word boundary please */
6275                 siz -= (siz % 4);
6276         }
6277         return (siz);
6278 }
6279
6280 static void
6281 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6282 {
6283         /*
6284          * We assume that the user wants PR_SCTP_TTL if the user provides a
6285          * positive lifetime but does not specify any PR_SCTP policy.
6286          */
6287         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6288                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6289         } else if (sp->timetolive > 0) {
6290                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6291                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6292         } else {
6293                 return;
6294         }
6295         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6296         case CHUNK_FLAGS_PR_SCTP_BUF:
6297                 /*
6298                  * Time to live is a priority stored in tv_sec when doing
6299                  * the buffer drop thing.
6300                  */
6301                 sp->ts.tv_sec = sp->timetolive;
6302                 sp->ts.tv_usec = 0;
6303                 break;
6304         case CHUNK_FLAGS_PR_SCTP_TTL:
6305                 {
6306                         struct timeval tv;
6307
6308                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6309                         tv.tv_sec = sp->timetolive / 1000;
6310                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6311                         /*
6312                          * TODO sctp_constants.h needs alternative time
6313                          * macros when _KERNEL is undefined.
6314                          */
6315                         timevaladd(&sp->ts, &tv);
6316                 }
6317                 break;
6318         case CHUNK_FLAGS_PR_SCTP_RTX:
6319                 /*
6320                  * Time to live is a the number or retransmissions stored in
6321                  * tv_sec.
6322                  */
6323                 sp->ts.tv_sec = sp->timetolive;
6324                 sp->ts.tv_usec = 0;
6325                 break;
6326         default:
6327                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6328                     "Unknown PR_SCTP policy %u.\n",
6329                     PR_SCTP_POLICY(sp->sinfo_flags));
6330                 break;
6331         }
6332 }
6333
6334 static int
6335 sctp_msg_append(struct sctp_tcb *stcb,
6336     struct sctp_nets *net,
6337     struct mbuf *m,
6338     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6339 {
6340         int error = 0;
6341         struct mbuf *at;
6342         struct sctp_stream_queue_pending *sp = NULL;
6343         struct sctp_stream_out *strm;
6344
6345         /*
6346          * Given an mbuf chain, put it into the association send queue and
6347          * place it on the wheel
6348          */
6349         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6350                 /* Invalid stream number */
6351                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6352                 error = EINVAL;
6353                 goto out_now;
6354         }
6355         if ((stcb->asoc.stream_locked) &&
6356             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6357                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6358                 error = EINVAL;
6359                 goto out_now;
6360         }
6361         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6362         /* Now can we send this? */
6363         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6364             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6365             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6366             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6367                 /* got data while shutting down */
6368                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6369                 error = ECONNRESET;
6370                 goto out_now;
6371         }
6372         sctp_alloc_a_strmoq(stcb, sp);
6373         if (sp == NULL) {
6374                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6375                 error = ENOMEM;
6376                 goto out_now;
6377         }
6378         sp->sinfo_flags = srcv->sinfo_flags;
6379         sp->timetolive = srcv->sinfo_timetolive;
6380         sp->ppid = srcv->sinfo_ppid;
6381         sp->context = srcv->sinfo_context;
6382         sp->fsn = 0;
6383         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6384                 sp->net = net;
6385                 atomic_add_int(&sp->net->ref_count, 1);
6386         } else {
6387                 sp->net = NULL;
6388         }
6389         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6390         sp->sid = srcv->sinfo_stream;
6391         sp->msg_is_complete = 1;
6392         sp->sender_all_done = 1;
6393         sp->some_taken = 0;
6394         sp->data = m;
6395         sp->tail_mbuf = NULL;
6396         sctp_set_prsctp_policy(sp);
6397         /*
6398          * We could in theory (for sendall) sifa the length in, but we would
6399          * still have to hunt through the chain since we need to setup the
6400          * tail_mbuf
6401          */
6402         sp->length = 0;
6403         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6404                 if (SCTP_BUF_NEXT(at) == NULL)
6405                         sp->tail_mbuf = at;
6406                 sp->length += SCTP_BUF_LEN(at);
6407         }
6408         if (srcv->sinfo_keynumber_valid) {
6409                 sp->auth_keyid = srcv->sinfo_keynumber;
6410         } else {
6411                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6412         }
6413         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6414                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6415                 sp->holds_key_ref = 1;
6416         }
6417         if (hold_stcb_lock == 0) {
6418                 SCTP_TCB_SEND_LOCK(stcb);
6419         }
6420         sctp_snd_sb_alloc(stcb, sp->length);
6421         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6422         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6423         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6424         m = NULL;
6425         if (hold_stcb_lock == 0) {
6426                 SCTP_TCB_SEND_UNLOCK(stcb);
6427         }
6428 out_now:
6429         if (m) {
6430                 sctp_m_freem(m);
6431         }
6432         return (error);
6433 }
6434
6435
6436 static struct mbuf *
6437 sctp_copy_mbufchain(struct mbuf *clonechain,
6438     struct mbuf *outchain,
6439     struct mbuf **endofchain,
6440     int can_take_mbuf,
6441     int sizeofcpy,
6442     uint8_t copy_by_ref)
6443 {
6444         struct mbuf *m;
6445         struct mbuf *appendchain;
6446         caddr_t cp;
6447         int len;
6448
6449         if (endofchain == NULL) {
6450                 /* error */
6451 error_out:
6452                 if (outchain)
6453                         sctp_m_freem(outchain);
6454                 return (NULL);
6455         }
6456         if (can_take_mbuf) {
6457                 appendchain = clonechain;
6458         } else {
6459                 if (!copy_by_ref &&
6460                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6461                     ) {
6462                         /* Its not in a cluster */
6463                         if (*endofchain == NULL) {
6464                                 /* lets get a mbuf cluster */
6465                                 if (outchain == NULL) {
6466                                         /* This is the general case */
6467                         new_mbuf:
6468                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6469                                         if (outchain == NULL) {
6470                                                 goto error_out;
6471                                         }
6472                                         SCTP_BUF_LEN(outchain) = 0;
6473                                         *endofchain = outchain;
6474                                         /* get the prepend space */
6475                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6476                                 } else {
6477                                         /*
6478                                          * We really should not get a NULL
6479                                          * in endofchain
6480                                          */
6481                                         /* find end */
6482                                         m = outchain;
6483                                         while (m) {
6484                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6485                                                         *endofchain = m;
6486                                                         break;
6487                                                 }
6488                                                 m = SCTP_BUF_NEXT(m);
6489                                         }
6490                                         /* sanity */
6491                                         if (*endofchain == NULL) {
6492                                                 /*
6493                                                  * huh, TSNH XXX maybe we
6494                                                  * should panic
6495                                                  */
6496                                                 sctp_m_freem(outchain);
6497                                                 goto new_mbuf;
6498                                         }
6499                                 }
6500                                 /* get the new end of length */
6501                                 len = (int)M_TRAILINGSPACE(*endofchain);
6502                         } else {
6503                                 /* how much is left at the end? */
6504                                 len = (int)M_TRAILINGSPACE(*endofchain);
6505                         }
6506                         /* Find the end of the data, for appending */
6507                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6508
6509                         /* Now lets copy it out */
6510                         if (len >= sizeofcpy) {
6511                                 /* It all fits, copy it in */
6512                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6513                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6514                         } else {
6515                                 /* fill up the end of the chain */
6516                                 if (len > 0) {
6517                                         m_copydata(clonechain, 0, len, cp);
6518                                         SCTP_BUF_LEN((*endofchain)) += len;
6519                                         /* now we need another one */
6520                                         sizeofcpy -= len;
6521                                 }
6522                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6523                                 if (m == NULL) {
6524                                         /* We failed */
6525                                         goto error_out;
6526                                 }
6527                                 SCTP_BUF_NEXT((*endofchain)) = m;
6528                                 *endofchain = m;
6529                                 cp = mtod((*endofchain), caddr_t);
6530                                 m_copydata(clonechain, len, sizeofcpy, cp);
6531                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6532                         }
6533                         return (outchain);
6534                 } else {
6535                         /* copy the old fashion way */
6536                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6537 #ifdef SCTP_MBUF_LOGGING
6538                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6539                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6540                         }
6541 #endif
6542                 }
6543         }
6544         if (appendchain == NULL) {
6545                 /* error */
6546                 if (outchain)
6547                         sctp_m_freem(outchain);
6548                 return (NULL);
6549         }
6550         if (outchain) {
6551                 /* tack on to the end */
6552                 if (*endofchain != NULL) {
6553                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6554                 } else {
6555                         m = outchain;
6556                         while (m) {
6557                                 if (SCTP_BUF_NEXT(m) == NULL) {
6558                                         SCTP_BUF_NEXT(m) = appendchain;
6559                                         break;
6560                                 }
6561                                 m = SCTP_BUF_NEXT(m);
6562                         }
6563                 }
6564                 /*
6565                  * save off the end and update the end-chain position
6566                  */
6567                 m = appendchain;
6568                 while (m) {
6569                         if (SCTP_BUF_NEXT(m) == NULL) {
6570                                 *endofchain = m;
6571                                 break;
6572                         }
6573                         m = SCTP_BUF_NEXT(m);
6574                 }
6575                 return (outchain);
6576         } else {
6577                 /* save off the end and update the end-chain position */
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 (appendchain);
6587         }
6588 }
6589
6590 static int
6591 sctp_med_chunk_output(struct sctp_inpcb *inp,
6592     struct sctp_tcb *stcb,
6593     struct sctp_association *asoc,
6594     int *num_out,
6595     int *reason_code,
6596     int control_only, int from_where,
6597     struct timeval *now, int *now_filled, int frag_point, int so_locked
6598 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6599     SCTP_UNUSED
6600 #endif
6601 );
6602
6603 static void
6604 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6605     uint32_t val SCTP_UNUSED)
6606 {
6607         struct sctp_copy_all *ca;
6608         struct mbuf *m;
6609         int ret = 0;
6610         int added_control = 0;
6611         int un_sent, do_chunk_output = 1;
6612         struct sctp_association *asoc;
6613         struct sctp_nets *net;
6614
6615         ca = (struct sctp_copy_all *)ptr;
6616         if (ca->m == NULL) {
6617                 return;
6618         }
6619         if (ca->inp != inp) {
6620                 /* TSNH */
6621                 return;
6622         }
6623         if (ca->sndlen > 0) {
6624                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6625                 if (m == NULL) {
6626                         /* can't copy so we are done */
6627                         ca->cnt_failed++;
6628                         return;
6629                 }
6630 #ifdef SCTP_MBUF_LOGGING
6631                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6632                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6633                 }
6634 #endif
6635         } else {
6636                 m = NULL;
6637         }
6638         SCTP_TCB_LOCK_ASSERT(stcb);
6639         if (stcb->asoc.alternate) {
6640                 net = stcb->asoc.alternate;
6641         } else {
6642                 net = stcb->asoc.primary_destination;
6643         }
6644         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6645                 /* Abort this assoc with m as the user defined reason */
6646                 if (m != NULL) {
6647                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6648                 } else {
6649                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6650                             0, M_NOWAIT, 1, MT_DATA);
6651                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6652                 }
6653                 if (m != NULL) {
6654                         struct sctp_paramhdr *ph;
6655
6656                         ph = mtod(m, struct sctp_paramhdr *);
6657                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6658                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6659                 }
6660                 /*
6661                  * We add one here to keep the assoc from dis-appearing on
6662                  * us.
6663                  */
6664                 atomic_add_int(&stcb->asoc.refcnt, 1);
6665                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6666                 /*
6667                  * sctp_abort_an_association calls sctp_free_asoc() free
6668                  * association will NOT free it since we incremented the
6669                  * refcnt .. we do this to prevent it being freed and things
6670                  * getting tricky since we could end up (from free_asoc)
6671                  * calling inpcb_free which would get a recursive lock call
6672                  * to the iterator lock.. But as a consequence of that the
6673                  * stcb will return to us un-locked.. since free_asoc
6674                  * returns with either no TCB or the TCB unlocked, we must
6675                  * relock.. to unlock in the iterator timer :-0
6676                  */
6677                 SCTP_TCB_LOCK(stcb);
6678                 atomic_add_int(&stcb->asoc.refcnt, -1);
6679                 goto no_chunk_output;
6680         } else {
6681                 if (m) {
6682                         ret = sctp_msg_append(stcb, net, m,
6683                             &ca->sndrcv, 1);
6684                 }
6685                 asoc = &stcb->asoc;
6686                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6687                         /* shutdown this assoc */
6688                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6689                             TAILQ_EMPTY(&asoc->sent_queue) &&
6690                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6691                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6692                                         goto abort_anyway;
6693                                 }
6694                                 /*
6695                                  * there is nothing queued to send, so I'm
6696                                  * done...
6697                                  */
6698                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6699                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6700                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6701                                         /*
6702                                          * only send SHUTDOWN the first time
6703                                          * through
6704                                          */
6705                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6706                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6707                                         }
6708                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6709                                         sctp_stop_timers_for_shutdown(stcb);
6710                                         sctp_send_shutdown(stcb, net);
6711                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6712                                             net);
6713                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6714                                             asoc->primary_destination);
6715                                         added_control = 1;
6716                                         do_chunk_output = 0;
6717                                 }
6718                         } else {
6719                                 /*
6720                                  * we still got (or just got) data to send,
6721                                  * so set SHUTDOWN_PENDING
6722                                  */
6723                                 /*
6724                                  * XXX sockets draft says that SCTP_EOF
6725                                  * should be sent with no data.  currently,
6726                                  * we will allow user data to be sent first
6727                                  * and move to SHUTDOWN-PENDING
6728                                  */
6729                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6730                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6731                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6732                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6733                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6734                                         }
6735                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6736                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6737                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6738                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6739                                                 struct mbuf *op_err;
6740                                                 char msg[SCTP_DIAG_INFO_LEN];
6741
6742                                 abort_anyway:
6743                                                 snprintf(msg, sizeof(msg),
6744                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6745                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6746                                                     msg);
6747                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6748                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6749                                                     op_err, SCTP_SO_NOT_LOCKED);
6750                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6751                                                 goto no_chunk_output;
6752                                         }
6753                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6754                                             asoc->primary_destination);
6755                                 }
6756                         }
6757
6758                 }
6759         }
6760         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6761             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6762
6763         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6764             (stcb->asoc.total_flight > 0) &&
6765             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6766                 do_chunk_output = 0;
6767         }
6768         if (do_chunk_output)
6769                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6770         else if (added_control) {
6771                 int num_out, reason, now_filled = 0;
6772                 struct timeval now;
6773                 int frag_point;
6774
6775                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6776                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6777                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6778         }
6779 no_chunk_output:
6780         if (ret) {
6781                 ca->cnt_failed++;
6782         } else {
6783                 ca->cnt_sent++;
6784         }
6785 }
6786
6787 static void
6788 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6789 {
6790         struct sctp_copy_all *ca;
6791
6792         ca = (struct sctp_copy_all *)ptr;
6793         /*
6794          * Do a notify here? Kacheong suggests that the notify be done at
6795          * the send time.. so you would push up a notification if any send
6796          * failed. Don't know if this is feasible since the only failures we
6797          * have is "memory" related and if you cannot get an mbuf to send
6798          * the data you surely can't get an mbuf to send up to notify the
6799          * user you can't send the data :->
6800          */
6801
6802         /* now free everything */
6803         sctp_m_freem(ca->m);
6804         SCTP_FREE(ca, SCTP_M_COPYAL);
6805 }
6806
6807 static struct mbuf *
6808 sctp_copy_out_all(struct uio *uio, int len)
6809 {
6810         struct mbuf *ret, *at;
6811         int left, willcpy, cancpy, error;
6812
6813         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6814         if (ret == NULL) {
6815                 /* TSNH */
6816                 return (NULL);
6817         }
6818         left = len;
6819         SCTP_BUF_LEN(ret) = 0;
6820         /* save space for the data chunk header */
6821         cancpy = (int)M_TRAILINGSPACE(ret);
6822         willcpy = min(cancpy, left);
6823         at = ret;
6824         while (left > 0) {
6825                 /* Align data to the end */
6826                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6827                 if (error) {
6828         err_out_now:
6829                         sctp_m_freem(at);
6830                         return (NULL);
6831                 }
6832                 SCTP_BUF_LEN(at) = willcpy;
6833                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6834                 left -= willcpy;
6835                 if (left > 0) {
6836                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6837                         if (SCTP_BUF_NEXT(at) == NULL) {
6838                                 goto err_out_now;
6839                         }
6840                         at = SCTP_BUF_NEXT(at);
6841                         SCTP_BUF_LEN(at) = 0;
6842                         cancpy = (int)M_TRAILINGSPACE(at);
6843                         willcpy = min(cancpy, left);
6844                 }
6845         }
6846         return (ret);
6847 }
6848
6849 static int
6850 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6851     struct sctp_sndrcvinfo *srcv)
6852 {
6853         int ret;
6854         struct sctp_copy_all *ca;
6855
6856         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6857             SCTP_M_COPYAL);
6858         if (ca == NULL) {
6859                 sctp_m_freem(m);
6860                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6861                 return (ENOMEM);
6862         }
6863         memset(ca, 0, sizeof(struct sctp_copy_all));
6864
6865         ca->inp = inp;
6866         if (srcv) {
6867                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6868         }
6869         /*
6870          * take off the sendall flag, it would be bad if we failed to do
6871          * this :-0
6872          */
6873         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6874         /* get length and mbuf chain */
6875         if (uio) {
6876                 ca->sndlen = (int)uio->uio_resid;
6877                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6878                 if (ca->m == NULL) {
6879                         SCTP_FREE(ca, SCTP_M_COPYAL);
6880                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6881                         return (ENOMEM);
6882                 }
6883         } else {
6884                 /* Gather the length of the send */
6885                 struct mbuf *mat;
6886
6887                 ca->sndlen = 0;
6888                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6889                         ca->sndlen += SCTP_BUF_LEN(mat);
6890                 }
6891         }
6892         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6893             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6894             SCTP_ASOC_ANY_STATE,
6895             (void *)ca, 0,
6896             sctp_sendall_completes, inp, 1);
6897         if (ret) {
6898                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6899                 SCTP_FREE(ca, SCTP_M_COPYAL);
6900                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6901                 return (EFAULT);
6902         }
6903         return (0);
6904 }
6905
6906
6907 void
6908 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6909 {
6910         struct sctp_tmit_chunk *chk, *nchk;
6911
6912         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6913                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6914                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6915                         asoc->ctrl_queue_cnt--;
6916                         if (chk->data) {
6917                                 sctp_m_freem(chk->data);
6918                                 chk->data = NULL;
6919                         }
6920                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6921                 }
6922         }
6923 }
6924
6925 void
6926 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6927 {
6928         struct sctp_association *asoc;
6929         struct sctp_tmit_chunk *chk, *nchk;
6930         struct sctp_asconf_chunk *acp;
6931
6932         asoc = &stcb->asoc;
6933         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6934                 /* find SCTP_ASCONF chunk in queue */
6935                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6936                         if (chk->data) {
6937                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6938                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6939                                         /* Not Acked yet */
6940                                         break;
6941                                 }
6942                         }
6943                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6944                         asoc->ctrl_queue_cnt--;
6945                         if (chk->data) {
6946                                 sctp_m_freem(chk->data);
6947                                 chk->data = NULL;
6948                         }
6949                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6950                 }
6951         }
6952 }
6953
6954
6955 static void
6956 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6957     struct sctp_association *asoc,
6958     struct sctp_tmit_chunk **data_list,
6959     int bundle_at,
6960     struct sctp_nets *net)
6961 {
6962         int i;
6963         struct sctp_tmit_chunk *tp1;
6964
6965         for (i = 0; i < bundle_at; i++) {
6966                 /* off of the send queue */
6967                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6968                 asoc->send_queue_cnt--;
6969                 if (i > 0) {
6970                         /*
6971                          * Any chunk NOT 0 you zap the time chunk 0 gets
6972                          * zapped or set based on if a RTO measurment is
6973                          * needed.
6974                          */
6975                         data_list[i]->do_rtt = 0;
6976                 }
6977                 /* record time */
6978                 data_list[i]->sent_rcv_time = net->last_sent_time;
6979                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6980                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6981                 if (data_list[i]->whoTo == NULL) {
6982                         data_list[i]->whoTo = net;
6983                         atomic_add_int(&net->ref_count, 1);
6984                 }
6985                 /* on to the sent queue */
6986                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6987                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6988                         struct sctp_tmit_chunk *tpp;
6989
6990                         /* need to move back */
6991         back_up_more:
6992                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6993                         if (tpp == NULL) {
6994                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6995                                 goto all_done;
6996                         }
6997                         tp1 = tpp;
6998                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6999                                 goto back_up_more;
7000                         }
7001                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7002                 } else {
7003                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7004                             data_list[i],
7005                             sctp_next);
7006                 }
7007 all_done:
7008                 /* This does not lower until the cum-ack passes it */
7009                 asoc->sent_queue_cnt++;
7010                 if ((asoc->peers_rwnd <= 0) &&
7011                     (asoc->total_flight == 0) &&
7012                     (bundle_at == 1)) {
7013                         /* Mark the chunk as being a window probe */
7014                         SCTP_STAT_INCR(sctps_windowprobed);
7015                 }
7016 #ifdef SCTP_AUDITING_ENABLED
7017                 sctp_audit_log(0xC2, 3);
7018 #endif
7019                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7020                 data_list[i]->snd_count = 1;
7021                 data_list[i]->rec.data.chunk_was_revoked = 0;
7022                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7023                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7024                             data_list[i]->whoTo->flight_size,
7025                             data_list[i]->book_size,
7026                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7027                             data_list[i]->rec.data.tsn);
7028                 }
7029                 sctp_flight_size_increase(data_list[i]);
7030                 sctp_total_flight_increase(stcb, data_list[i]);
7031                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7032                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7033                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7034                 }
7035                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7036                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7037                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7038                         /* SWS sender side engages */
7039                         asoc->peers_rwnd = 0;
7040                 }
7041         }
7042         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7043                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7044         }
7045 }
7046
7047 static void
7048 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7049 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7050     SCTP_UNUSED
7051 #endif
7052 )
7053 {
7054         struct sctp_tmit_chunk *chk, *nchk;
7055
7056         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7057                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7058                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7059                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7060                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7062                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7063                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7064                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7065                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7066                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7067                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7068                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7069                         /* Stray chunks must be cleaned up */
7070         clean_up_anyway:
7071                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7072                         asoc->ctrl_queue_cnt--;
7073                         if (chk->data) {
7074                                 sctp_m_freem(chk->data);
7075                                 chk->data = NULL;
7076                         }
7077                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7078                                 asoc->fwd_tsn_cnt--;
7079                         }
7080                         sctp_free_a_chunk(stcb, chk, so_locked);
7081                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7082                         /* special handling, we must look into the param */
7083                         if (chk != asoc->str_reset) {
7084                                 goto clean_up_anyway;
7085                         }
7086                 }
7087         }
7088 }
7089
7090 static uint32_t
7091 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7092     uint32_t space_left, uint32_t frag_point, int eeor_on)
7093 {
7094         /*
7095          * Make a decision on if I should split a msg into multiple parts.
7096          * This is only asked of incomplete messages.
7097          */
7098         if (eeor_on) {
7099                 /*
7100                  * If we are doing EEOR we need to always send it if its the
7101                  * entire thing, since it might be all the guy is putting in
7102                  * the hopper.
7103                  */
7104                 if (space_left >= length) {
7105                         /*-
7106                          * If we have data outstanding,
7107                          * we get another chance when the sack
7108                          * arrives to transmit - wait for more data
7109                          */
7110                         if (stcb->asoc.total_flight == 0) {
7111                                 /*
7112                                  * If nothing is in flight, we zero the
7113                                  * packet counter.
7114                                  */
7115                                 return (length);
7116                         }
7117                         return (0);
7118
7119                 } else {
7120                         /* You can fill the rest */
7121                         return (space_left);
7122                 }
7123         }
7124         /*-
7125          * For those strange folk that make the send buffer
7126          * smaller than our fragmentation point, we can't
7127          * get a full msg in so we have to allow splitting.
7128          */
7129         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7130                 return (length);
7131         }
7132         if ((length <= space_left) ||
7133             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7134                 /* Sub-optimial residual don't split in non-eeor mode. */
7135                 return (0);
7136         }
7137         /*
7138          * If we reach here length is larger than the space_left. Do we wish
7139          * to split it for the sake of packet putting together?
7140          */
7141         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7142                 /* Its ok to split it */
7143                 return (min(space_left, frag_point));
7144         }
7145         /* Nope, can't split */
7146         return (0);
7147 }
7148
7149 static uint32_t
7150 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7151     struct sctp_stream_out *strq,
7152     uint32_t space_left,
7153     uint32_t frag_point,
7154     int *giveup,
7155     int eeor_mode,
7156     int *bail,
7157     int so_locked
7158 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7159     SCTP_UNUSED
7160 #endif
7161 )
7162 {
7163         /* Move from the stream to the send_queue keeping track of the total */
7164         struct sctp_association *asoc;
7165         struct sctp_stream_queue_pending *sp;
7166         struct sctp_tmit_chunk *chk;
7167         struct sctp_data_chunk *dchkh = NULL;
7168         struct sctp_idata_chunk *ndchkh = NULL;
7169         uint32_t to_move, length;
7170         int leading;
7171         uint8_t rcv_flags = 0;
7172         uint8_t some_taken;
7173         uint8_t send_lock_up = 0;
7174
7175         SCTP_TCB_LOCK_ASSERT(stcb);
7176         asoc = &stcb->asoc;
7177 one_more_time:
7178         /* sa_ignore FREED_MEMORY */
7179         sp = TAILQ_FIRST(&strq->outqueue);
7180         if (sp == NULL) {
7181                 if (send_lock_up == 0) {
7182                         SCTP_TCB_SEND_LOCK(stcb);
7183                         send_lock_up = 1;
7184                 }
7185                 sp = TAILQ_FIRST(&strq->outqueue);
7186                 if (sp) {
7187                         goto one_more_time;
7188                 }
7189                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7190                     (stcb->asoc.idata_supported == 0) &&
7191                     (strq->last_msg_incomplete)) {
7192                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7193                             strq->sid,
7194                             strq->last_msg_incomplete);
7195                         strq->last_msg_incomplete = 0;
7196                 }
7197                 to_move = 0;
7198                 if (send_lock_up) {
7199                         SCTP_TCB_SEND_UNLOCK(stcb);
7200                         send_lock_up = 0;
7201                 }
7202                 goto out_of;
7203         }
7204         if ((sp->msg_is_complete) && (sp->length == 0)) {
7205                 if (sp->sender_all_done) {
7206                         /*
7207                          * We are doing deferred cleanup. Last time through
7208                          * when we took all the data the sender_all_done was
7209                          * not set.
7210                          */
7211                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7212                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7213                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7214                                     sp->sender_all_done,
7215                                     sp->length,
7216                                     sp->msg_is_complete,
7217                                     sp->put_last_out,
7218                                     send_lock_up);
7219                         }
7220                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7221                                 SCTP_TCB_SEND_LOCK(stcb);
7222                                 send_lock_up = 1;
7223                         }
7224                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7225                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7226                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7227                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7228                             (strq->chunks_on_queues == 0) &&
7229                             TAILQ_EMPTY(&strq->outqueue)) {
7230                                 stcb->asoc.trigger_reset = 1;
7231                         }
7232                         if (sp->net) {
7233                                 sctp_free_remote_addr(sp->net);
7234                                 sp->net = NULL;
7235                         }
7236                         if (sp->data) {
7237                                 sctp_m_freem(sp->data);
7238                                 sp->data = NULL;
7239                         }
7240                         sctp_free_a_strmoq(stcb, sp, so_locked);
7241                         /* we can't be locked to it */
7242                         if (send_lock_up) {
7243                                 SCTP_TCB_SEND_UNLOCK(stcb);
7244                                 send_lock_up = 0;
7245                         }
7246                         /* back to get the next msg */
7247                         goto one_more_time;
7248                 } else {
7249                         /*
7250                          * sender just finished this but still holds a
7251                          * reference
7252                          */
7253                         *giveup = 1;
7254                         to_move = 0;
7255                         goto out_of;
7256                 }
7257         } else {
7258                 /* is there some to get */
7259                 if (sp->length == 0) {
7260                         /* no */
7261                         *giveup = 1;
7262                         to_move = 0;
7263                         goto out_of;
7264                 } else if (sp->discard_rest) {
7265                         if (send_lock_up == 0) {
7266                                 SCTP_TCB_SEND_LOCK(stcb);
7267                                 send_lock_up = 1;
7268                         }
7269                         /* Whack down the size */
7270                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7271                         if ((stcb->sctp_socket != NULL) &&
7272                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7273                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7274                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7275                         }
7276                         if (sp->data) {
7277                                 sctp_m_freem(sp->data);
7278                                 sp->data = NULL;
7279                                 sp->tail_mbuf = NULL;
7280                         }
7281                         sp->length = 0;
7282                         sp->some_taken = 1;
7283                         *giveup = 1;
7284                         to_move = 0;
7285                         goto out_of;
7286                 }
7287         }
7288         some_taken = sp->some_taken;
7289 re_look:
7290         length = sp->length;
7291         if (sp->msg_is_complete) {
7292                 /* The message is complete */
7293                 to_move = min(length, frag_point);
7294                 if (to_move == length) {
7295                         /* All of it fits in the MTU */
7296                         if (sp->some_taken) {
7297                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7298                         } else {
7299                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7300                         }
7301                         sp->put_last_out = 1;
7302                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7303                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7304                         }
7305                 } else {
7306                         /* Not all of it fits, we fragment */
7307                         if (sp->some_taken == 0) {
7308                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7309                         }
7310                         sp->some_taken = 1;
7311                 }
7312         } else {
7313                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7314                 if (to_move) {
7315                         /*-
7316                          * We use a snapshot of length in case it
7317                          * is expanding during the compare.
7318                          */
7319                         uint32_t llen;
7320
7321                         llen = length;
7322                         if (to_move >= llen) {
7323                                 to_move = llen;
7324                                 if (send_lock_up == 0) {
7325                                         /*-
7326                                          * We are taking all of an incomplete msg
7327                                          * thus we need a send lock.
7328                                          */
7329                                         SCTP_TCB_SEND_LOCK(stcb);
7330                                         send_lock_up = 1;
7331                                         if (sp->msg_is_complete) {
7332                                                 /*
7333                                                  * the sender finished the
7334                                                  * msg
7335                                                  */
7336                                                 goto re_look;
7337                                         }
7338                                 }
7339                         }
7340                         if (sp->some_taken == 0) {
7341                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7342                                 sp->some_taken = 1;
7343                         }
7344                 } else {
7345                         /* Nothing to take. */
7346                         *giveup = 1;
7347                         to_move = 0;
7348                         goto out_of;
7349                 }
7350         }
7351
7352         /* If we reach here, we can copy out a chunk */
7353         sctp_alloc_a_chunk(stcb, chk);
7354         if (chk == NULL) {
7355                 /* No chunk memory */
7356                 *giveup = 1;
7357                 to_move = 0;
7358                 goto out_of;
7359         }
7360         /*
7361          * Setup for unordered if needed by looking at the user sent info
7362          * flags.
7363          */
7364         if (sp->sinfo_flags & SCTP_UNORDERED) {
7365                 rcv_flags |= SCTP_DATA_UNORDERED;
7366         }
7367         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7368             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7369                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7370         }
7371         /* clear out the chunk before setting up */
7372         memset(chk, 0, sizeof(*chk));
7373         chk->rec.data.rcv_flags = rcv_flags;
7374
7375         if (to_move >= length) {
7376                 /* we think we can steal the whole thing */
7377                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7378                         SCTP_TCB_SEND_LOCK(stcb);
7379                         send_lock_up = 1;
7380                 }
7381                 if (to_move < sp->length) {
7382                         /* bail, it changed */
7383                         goto dont_do_it;
7384                 }
7385                 chk->data = sp->data;
7386                 chk->last_mbuf = sp->tail_mbuf;
7387                 /* register the stealing */
7388                 sp->data = sp->tail_mbuf = NULL;
7389         } else {
7390                 struct mbuf *m;
7391
7392 dont_do_it:
7393                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7394                 chk->last_mbuf = NULL;
7395                 if (chk->data == NULL) {
7396                         sp->some_taken = some_taken;
7397                         sctp_free_a_chunk(stcb, chk, so_locked);
7398                         *bail = 1;
7399                         to_move = 0;
7400                         goto out_of;
7401                 }
7402 #ifdef SCTP_MBUF_LOGGING
7403                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7404                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7405                 }
7406 #endif
7407                 /* Pull off the data */
7408                 m_adj(sp->data, to_move);
7409                 /* Now lets work our way down and compact it */
7410                 m = sp->data;
7411                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7412                         sp->data = SCTP_BUF_NEXT(m);
7413                         SCTP_BUF_NEXT(m) = NULL;
7414                         if (sp->tail_mbuf == m) {
7415                                 /*-
7416                                  * Freeing tail? TSNH since
7417                                  * we supposedly were taking less
7418                                  * than the sp->length.
7419                                  */
7420 #ifdef INVARIANTS
7421                                 panic("Huh, freing tail? - TSNH");
7422 #else
7423                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7424                                 sp->tail_mbuf = sp->data = NULL;
7425                                 sp->length = 0;
7426 #endif
7427
7428                         }
7429                         sctp_m_free(m);
7430                         m = sp->data;
7431                 }
7432         }
7433         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7434                 chk->copy_by_ref = 1;
7435         } else {
7436                 chk->copy_by_ref = 0;
7437         }
7438         /*
7439          * get last_mbuf and counts of mb usage This is ugly but hopefully
7440          * its only one mbuf.
7441          */
7442         if (chk->last_mbuf == NULL) {
7443                 chk->last_mbuf = chk->data;
7444                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7445                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7446                 }
7447         }
7448
7449         if (to_move > length) {
7450                 /*- This should not happen either
7451                  * since we always lower to_move to the size
7452                  * of sp->length if its larger.
7453                  */
7454 #ifdef INVARIANTS
7455                 panic("Huh, how can to_move be larger?");
7456 #else
7457                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7458                 sp->length = 0;
7459 #endif
7460         } else {
7461                 atomic_subtract_int(&sp->length, to_move);
7462         }
7463         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7464         if (M_LEADINGSPACE(chk->data) < leading) {
7465                 /* Not enough room for a chunk header, get some */
7466                 struct mbuf *m;
7467
7468                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7469                 if (m == NULL) {
7470                         /*
7471                          * we're in trouble here. _PREPEND below will free
7472                          * all the data if there is no leading space, so we
7473                          * must put the data back and restore.
7474                          */
7475                         if (send_lock_up == 0) {
7476                                 SCTP_TCB_SEND_LOCK(stcb);
7477                                 send_lock_up = 1;
7478                         }
7479                         if (sp->data == NULL) {
7480                                 /* unsteal the data */
7481                                 sp->data = chk->data;
7482                                 sp->tail_mbuf = chk->last_mbuf;
7483                         } else {
7484                                 struct mbuf *m_tmp;
7485
7486                                 /* reassemble the data */
7487                                 m_tmp = sp->data;
7488                                 sp->data = chk->data;
7489                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7490                         }
7491                         sp->some_taken = some_taken;
7492                         atomic_add_int(&sp->length, to_move);
7493                         chk->data = NULL;
7494                         *bail = 1;
7495                         sctp_free_a_chunk(stcb, chk, so_locked);
7496                         to_move = 0;
7497                         goto out_of;
7498                 } else {
7499                         SCTP_BUF_LEN(m) = 0;
7500                         SCTP_BUF_NEXT(m) = chk->data;
7501                         chk->data = m;
7502                         M_ALIGN(chk->data, 4);
7503                 }
7504         }
7505         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7506         if (chk->data == NULL) {
7507                 /* HELP, TSNH since we assured it would not above? */
7508 #ifdef INVARIANTS
7509                 panic("prepend failes HELP?");
7510 #else
7511                 SCTP_PRINTF("prepend fails HELP?\n");
7512                 sctp_free_a_chunk(stcb, chk, so_locked);
7513 #endif
7514                 *bail = 1;
7515                 to_move = 0;
7516                 goto out_of;
7517         }
7518         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7519         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7520         chk->book_size_scale = 0;
7521         chk->sent = SCTP_DATAGRAM_UNSENT;
7522
7523         chk->flags = 0;
7524         chk->asoc = &stcb->asoc;
7525         chk->pad_inplace = 0;
7526         chk->no_fr_allowed = 0;
7527         if (stcb->asoc.idata_supported == 0) {
7528                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7529                         /* Just use 0. The receiver ignores the values. */
7530                         chk->rec.data.mid = 0;
7531                 } else {
7532                         chk->rec.data.mid = strq->next_mid_ordered;
7533                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7534                                 strq->next_mid_ordered++;
7535                         }
7536                 }
7537         } else {
7538                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7539                         chk->rec.data.mid = strq->next_mid_unordered;
7540                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7541                                 strq->next_mid_unordered++;
7542                         }
7543                 } else {
7544                         chk->rec.data.mid = strq->next_mid_ordered;
7545                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7546                                 strq->next_mid_ordered++;
7547                         }
7548                 }
7549         }
7550         chk->rec.data.sid = sp->sid;
7551         chk->rec.data.ppid = sp->ppid;
7552         chk->rec.data.context = sp->context;
7553         chk->rec.data.doing_fast_retransmit = 0;
7554
7555         chk->rec.data.timetodrop = sp->ts;
7556         chk->flags = sp->act_flags;
7557
7558         if (sp->net) {
7559                 chk->whoTo = sp->net;
7560                 atomic_add_int(&chk->whoTo->ref_count, 1);
7561         } else
7562                 chk->whoTo = NULL;
7563
7564         if (sp->holds_key_ref) {
7565                 chk->auth_keyid = sp->auth_keyid;
7566                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7567                 chk->holds_key_ref = 1;
7568         }
7569         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7570         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7571                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7572                     (uint32_t)(uintptr_t)stcb, sp->length,
7573                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7574                     chk->rec.data.tsn);
7575         }
7576         if (stcb->asoc.idata_supported == 0) {
7577                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7578         } else {
7579                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7580         }
7581         /*
7582          * Put the rest of the things in place now. Size was done earlier in
7583          * previous loop prior to padding.
7584          */
7585
7586 #ifdef SCTP_ASOCLOG_OF_TSNS
7587         SCTP_TCB_LOCK_ASSERT(stcb);
7588         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7589                 asoc->tsn_out_at = 0;
7590                 asoc->tsn_out_wrapped = 1;
7591         }
7592         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7593         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7594         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7595         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7596         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7597         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7598         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7599         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7600         asoc->tsn_out_at++;
7601 #endif
7602         if (stcb->asoc.idata_supported == 0) {
7603                 dchkh->ch.chunk_type = SCTP_DATA;
7604                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7605                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7606                 dchkh->dp.sid = htons(strq->sid);
7607                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7608                 dchkh->dp.ppid = chk->rec.data.ppid;
7609                 dchkh->ch.chunk_length = htons(chk->send_size);
7610         } else {
7611                 ndchkh->ch.chunk_type = SCTP_IDATA;
7612                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7613                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7614                 ndchkh->dp.sid = htons(strq->sid);
7615                 ndchkh->dp.reserved = htons(0);
7616                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7617                 if (sp->fsn == 0)
7618                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7619                 else
7620                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7621                 sp->fsn++;
7622                 ndchkh->ch.chunk_length = htons(chk->send_size);
7623         }
7624         /* Now advance the chk->send_size by the actual pad needed. */
7625         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7626                 /* need a pad */
7627                 struct mbuf *lm;
7628                 int pads;
7629
7630                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7631                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7632                 if (lm != NULL) {
7633                         chk->last_mbuf = lm;
7634                         chk->pad_inplace = 1;
7635                 }
7636                 chk->send_size += pads;
7637         }
7638         if (PR_SCTP_ENABLED(chk->flags)) {
7639                 asoc->pr_sctp_cnt++;
7640         }
7641         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7642                 /* All done pull and kill the message */
7643                 if (sp->put_last_out == 0) {
7644                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7645                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7646                             sp->sender_all_done,
7647                             sp->length,
7648                             sp->msg_is_complete,
7649                             sp->put_last_out,
7650                             send_lock_up);
7651                 }
7652                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7653                         SCTP_TCB_SEND_LOCK(stcb);
7654                         send_lock_up = 1;
7655                 }
7656                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7657                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7658                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7659                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7660                     (strq->chunks_on_queues == 0) &&
7661                     TAILQ_EMPTY(&strq->outqueue)) {
7662                         stcb->asoc.trigger_reset = 1;
7663                 }
7664                 if (sp->net) {
7665                         sctp_free_remote_addr(sp->net);
7666                         sp->net = NULL;
7667                 }
7668                 if (sp->data) {
7669                         sctp_m_freem(sp->data);
7670                         sp->data = NULL;
7671                 }
7672                 sctp_free_a_strmoq(stcb, sp, so_locked);
7673         }
7674         asoc->chunks_on_out_queue++;
7675         strq->chunks_on_queues++;
7676         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7677         asoc->send_queue_cnt++;
7678 out_of:
7679         if (send_lock_up) {
7680                 SCTP_TCB_SEND_UNLOCK(stcb);
7681         }
7682         return (to_move);
7683 }
7684
7685
7686 static void
7687 sctp_fill_outqueue(struct sctp_tcb *stcb,
7688     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7689 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7690     SCTP_UNUSED
7691 #endif
7692 )
7693 {
7694         struct sctp_association *asoc;
7695         struct sctp_stream_out *strq;
7696         uint32_t space_left, moved, total_moved;
7697         int bail, giveup;
7698
7699         SCTP_TCB_LOCK_ASSERT(stcb);
7700         asoc = &stcb->asoc;
7701         total_moved = 0;
7702         switch (net->ro._l_addr.sa.sa_family) {
7703 #ifdef INET
7704         case AF_INET:
7705                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7706                 break;
7707 #endif
7708 #ifdef INET6
7709         case AF_INET6:
7710                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7711                 break;
7712 #endif
7713         default:
7714                 /* TSNH */
7715                 space_left = net->mtu;
7716                 break;
7717         }
7718         /* Need an allowance for the data chunk header too */
7719         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7720
7721         /* must make even word boundary */
7722         space_left &= 0xfffffffc;
7723         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7724         giveup = 0;
7725         bail = 0;
7726         while ((space_left > 0) && (strq != NULL)) {
7727                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7728                     &giveup, eeor_mode, &bail, so_locked);
7729                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7730                 if ((giveup != 0) || (bail != 0)) {
7731                         break;
7732                 }
7733                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7734                 total_moved += moved;
7735                 space_left -= moved;
7736                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7737                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7738                 } else {
7739                         space_left = 0;
7740                 }
7741                 space_left &= 0xfffffffc;
7742         }
7743         if (bail != 0)
7744                 *quit_now = 1;
7745
7746         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7747
7748         if (total_moved == 0) {
7749                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7750                     (net == stcb->asoc.primary_destination)) {
7751                         /* ran dry for primary network net */
7752                         SCTP_STAT_INCR(sctps_primary_randry);
7753                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7754                         /* ran dry with CMT on */
7755                         SCTP_STAT_INCR(sctps_cmt_randry);
7756                 }
7757         }
7758 }
7759
7760 void
7761 sctp_fix_ecn_echo(struct sctp_association *asoc)
7762 {
7763         struct sctp_tmit_chunk *chk;
7764
7765         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7766                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7767                         chk->sent = SCTP_DATAGRAM_UNSENT;
7768                 }
7769         }
7770 }
7771
7772 void
7773 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7774 {
7775         struct sctp_association *asoc;
7776         struct sctp_tmit_chunk *chk;
7777         struct sctp_stream_queue_pending *sp;
7778         unsigned int i;
7779
7780         if (net == NULL) {
7781                 return;
7782         }
7783         asoc = &stcb->asoc;
7784         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7785                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7786                         if (sp->net == net) {
7787                                 sctp_free_remote_addr(sp->net);
7788                                 sp->net = NULL;
7789                         }
7790                 }
7791         }
7792         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7793                 if (chk->whoTo == net) {
7794                         sctp_free_remote_addr(chk->whoTo);
7795                         chk->whoTo = NULL;
7796                 }
7797         }
7798 }
7799
7800 int
7801 sctp_med_chunk_output(struct sctp_inpcb *inp,
7802     struct sctp_tcb *stcb,
7803     struct sctp_association *asoc,
7804     int *num_out,
7805     int *reason_code,
7806     int control_only, int from_where,
7807     struct timeval *now, int *now_filled, int frag_point, int so_locked
7808 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7809     SCTP_UNUSED
7810 #endif
7811 )
7812 {
7813         /**
7814          * Ok this is the generic chunk service queue. we must do the
7815          * following:
7816          * - Service the stream queue that is next, moving any
7817          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7818          *   LAST to the out queue in one pass) and assigning TSN's. This
7819          *   only applys though if the peer does not support NDATA. For NDATA
7820          *   chunks its ok to not send the entire message ;-)
7821          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7822          *   fomulate and send the low level chunks. Making sure to combine
7823          *   any control in the control chunk queue also.
7824          */
7825         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7826         struct mbuf *outchain, *endoutchain;
7827         struct sctp_tmit_chunk *chk, *nchk;
7828
7829         /* temp arrays for unlinking */
7830         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7831         int no_fragmentflg, error;
7832         unsigned int max_rwnd_per_dest, max_send_per_dest;
7833         int one_chunk, hbflag, skip_data_for_this_net;
7834         int asconf, cookie, no_out_cnt;
7835         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7836         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7837         int tsns_sent = 0;
7838         uint32_t auth_offset = 0;
7839         struct sctp_auth_chunk *auth = NULL;
7840         uint16_t auth_keyid;
7841         int override_ok = 1;
7842         int skip_fill_up = 0;
7843         int data_auth_reqd = 0;
7844
7845         /*
7846          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7847          * destination.
7848          */
7849         int quit_now = 0;
7850
7851         *num_out = 0;
7852         *reason_code = 0;
7853         auth_keyid = stcb->asoc.authinfo.active_keyid;
7854         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7855             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7856             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7857                 eeor_mode = 1;
7858         } else {
7859                 eeor_mode = 0;
7860         }
7861         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7862         /*
7863          * First lets prime the pump. For each destination, if there is room
7864          * in the flight size, attempt to pull an MTU's worth out of the
7865          * stream queues into the general send_queue
7866          */
7867 #ifdef SCTP_AUDITING_ENABLED
7868         sctp_audit_log(0xC2, 2);
7869 #endif
7870         SCTP_TCB_LOCK_ASSERT(stcb);
7871         hbflag = 0;
7872         if (control_only)
7873                 no_data_chunks = 1;
7874         else
7875                 no_data_chunks = 0;
7876
7877         /* Nothing to possible to send? */
7878         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7879             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7880             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7881             TAILQ_EMPTY(&asoc->send_queue) &&
7882             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7883 nothing_to_send:
7884                 *reason_code = 9;
7885                 return (0);
7886         }
7887         if (asoc->peers_rwnd == 0) {
7888                 /* No room in peers rwnd */
7889                 *reason_code = 1;
7890                 if (asoc->total_flight > 0) {
7891                         /* we are allowed one chunk in flight */
7892                         no_data_chunks = 1;
7893                 }
7894         }
7895         if (stcb->asoc.ecn_echo_cnt_onq) {
7896                 /* Record where a sack goes, if any */
7897                 if (no_data_chunks &&
7898                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7899                         /* Nothing but ECNe to send - we don't do that */
7900                         goto nothing_to_send;
7901                 }
7902                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7903                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7904                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7905                                 sack_goes_to = chk->whoTo;
7906                                 break;
7907                         }
7908                 }
7909         }
7910         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7911         if (stcb->sctp_socket)
7912                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7913         else
7914                 max_send_per_dest = 0;
7915         if (no_data_chunks == 0) {
7916                 /* How many non-directed chunks are there? */
7917                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7918                         if (chk->whoTo == NULL) {
7919                                 /*
7920                                  * We already have non-directed chunks on
7921                                  * the queue, no need to do a fill-up.
7922                                  */
7923                                 skip_fill_up = 1;
7924                                 break;
7925                         }
7926                 }
7927
7928         }
7929         if ((no_data_chunks == 0) &&
7930             (skip_fill_up == 0) &&
7931             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7932                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7933                         /*
7934                          * This for loop we are in takes in each net, if
7935                          * its's got space in cwnd and has data sent to it
7936                          * (when CMT is off) then it calls
7937                          * sctp_fill_outqueue for the net. This gets data on
7938                          * the send queue for that network.
7939                          *
7940                          * In sctp_fill_outqueue TSN's are assigned and data
7941                          * is copied out of the stream buffers. Note mostly
7942                          * copy by reference (we hope).
7943                          */
7944                         net->window_probe = 0;
7945                         if ((net != stcb->asoc.alternate) &&
7946                             ((net->dest_state & SCTP_ADDR_PF) ||
7947                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7948                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7949                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7950                                         sctp_log_cwnd(stcb, net, 1,
7951                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7952                                 }
7953                                 continue;
7954                         }
7955                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7956                             (net->flight_size == 0)) {
7957                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7958                         }
7959                         if (net->flight_size >= net->cwnd) {
7960                                 /* skip this network, no room - can't fill */
7961                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7962                                         sctp_log_cwnd(stcb, net, 3,
7963                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7964                                 }
7965                                 continue;
7966                         }
7967                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7968                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7969                         }
7970                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7971                         if (quit_now) {
7972                                 /* memory alloc failure */
7973                                 no_data_chunks = 1;
7974                                 break;
7975                         }
7976                 }
7977         }
7978         /* now service each destination and send out what we can for it */
7979         /* Nothing to send? */
7980         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7981             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7982             TAILQ_EMPTY(&asoc->send_queue)) {
7983                 *reason_code = 8;
7984                 return (0);
7985         }
7986
7987         if (asoc->sctp_cmt_on_off > 0) {
7988                 /* get the last start point */
7989                 start_at = asoc->last_net_cmt_send_started;
7990                 if (start_at == NULL) {
7991                         /* null so to beginning */
7992                         start_at = TAILQ_FIRST(&asoc->nets);
7993                 } else {
7994                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7995                         if (start_at == NULL) {
7996                                 start_at = TAILQ_FIRST(&asoc->nets);
7997                         }
7998                 }
7999                 asoc->last_net_cmt_send_started = start_at;
8000         } else {
8001                 start_at = TAILQ_FIRST(&asoc->nets);
8002         }
8003         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8004                 if (chk->whoTo == NULL) {
8005                         if (asoc->alternate) {
8006                                 chk->whoTo = asoc->alternate;
8007                         } else {
8008                                 chk->whoTo = asoc->primary_destination;
8009                         }
8010                         atomic_add_int(&chk->whoTo->ref_count, 1);
8011                 }
8012         }
8013         old_start_at = NULL;
8014 again_one_more_time:
8015         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8016                 /* how much can we send? */
8017                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8018                 if (old_start_at && (old_start_at == net)) {
8019                         /* through list ocmpletely. */
8020                         break;
8021                 }
8022                 tsns_sent = 0xa;
8023                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8024                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8025                     (net->flight_size >= net->cwnd)) {
8026                         /*
8027                          * Nothing on control or asconf and flight is full,
8028                          * we can skip even in the CMT case.
8029                          */
8030                         continue;
8031                 }
8032                 bundle_at = 0;
8033                 endoutchain = outchain = NULL;
8034                 no_fragmentflg = 1;
8035                 one_chunk = 0;
8036                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8037                         skip_data_for_this_net = 1;
8038                 } else {
8039                         skip_data_for_this_net = 0;
8040                 }
8041                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8042 #ifdef INET
8043                 case AF_INET:
8044                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8045                         break;
8046 #endif
8047 #ifdef INET6
8048                 case AF_INET6:
8049                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8050                         break;
8051 #endif
8052                 default:
8053                         /* TSNH */
8054                         mtu = net->mtu;
8055                         break;
8056                 }
8057                 mx_mtu = mtu;
8058                 to_out = 0;
8059                 if (mtu > asoc->peers_rwnd) {
8060                         if (asoc->total_flight > 0) {
8061                                 /* We have a packet in flight somewhere */
8062                                 r_mtu = asoc->peers_rwnd;
8063                         } else {
8064                                 /* We are always allowed to send one MTU out */
8065                                 one_chunk = 1;
8066                                 r_mtu = mtu;
8067                         }
8068                 } else {
8069                         r_mtu = mtu;
8070                 }
8071                 error = 0;
8072                 /************************/
8073                 /* ASCONF transmission */
8074                 /************************/
8075                 /* Now first lets go through the asconf queue */
8076                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8077                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8078                                 continue;
8079                         }
8080                         if (chk->whoTo == NULL) {
8081                                 if (asoc->alternate == NULL) {
8082                                         if (asoc->primary_destination != net) {
8083                                                 break;
8084                                         }
8085                                 } else {
8086                                         if (asoc->alternate != net) {
8087                                                 break;
8088                                         }
8089                                 }
8090                         } else {
8091                                 if (chk->whoTo != net) {
8092                                         break;
8093                                 }
8094                         }
8095                         if (chk->data == NULL) {
8096                                 break;
8097                         }
8098                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8099                             chk->sent != SCTP_DATAGRAM_RESEND) {
8100                                 break;
8101                         }
8102                         /*
8103                          * if no AUTH is yet included and this chunk
8104                          * requires it, make sure to account for it.  We
8105                          * don't apply the size until the AUTH chunk is
8106                          * actually added below in case there is no room for
8107                          * this chunk. NOTE: we overload the use of "omtu"
8108                          * here
8109                          */
8110                         if ((auth == NULL) &&
8111                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8112                             stcb->asoc.peer_auth_chunks)) {
8113                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8114                         } else
8115                                 omtu = 0;
8116                         /* Here we do NOT factor the r_mtu */
8117                         if ((chk->send_size < (int)(mtu - omtu)) ||
8118                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8119                                 /*
8120                                  * We probably should glom the mbuf chain
8121                                  * from the chk->data for control but the
8122                                  * problem is it becomes yet one more level
8123                                  * of tracking to do if for some reason
8124                                  * output fails. Then I have got to
8125                                  * reconstruct the merged control chain.. el
8126                                  * yucko.. for now we take the easy way and
8127                                  * do the copy
8128                                  */
8129                                 /*
8130                                  * Add an AUTH chunk, if chunk requires it
8131                                  * save the offset into the chain for AUTH
8132                                  */
8133                                 if ((auth == NULL) &&
8134                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8135                                     stcb->asoc.peer_auth_chunks))) {
8136                                         outchain = sctp_add_auth_chunk(outchain,
8137                                             &endoutchain,
8138                                             &auth,
8139                                             &auth_offset,
8140                                             stcb,
8141                                             chk->rec.chunk_id.id);
8142                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8143                                 }
8144                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8145                                     (int)chk->rec.chunk_id.can_take_data,
8146                                     chk->send_size, chk->copy_by_ref);
8147                                 if (outchain == NULL) {
8148                                         *reason_code = 8;
8149                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8150                                         return (ENOMEM);
8151                                 }
8152                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8153                                 /* update our MTU size */
8154                                 if (mtu > (chk->send_size + omtu))
8155                                         mtu -= (chk->send_size + omtu);
8156                                 else
8157                                         mtu = 0;
8158                                 to_out += (chk->send_size + omtu);
8159                                 /* Do clear IP_DF ? */
8160                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8161                                         no_fragmentflg = 0;
8162                                 }
8163                                 if (chk->rec.chunk_id.can_take_data)
8164                                         chk->data = NULL;
8165                                 /*
8166                                  * set hb flag since we can use these for
8167                                  * RTO
8168                                  */
8169                                 hbflag = 1;
8170                                 asconf = 1;
8171                                 /*
8172                                  * should sysctl this: don't bundle data
8173                                  * with ASCONF since it requires AUTH
8174                                  */
8175                                 no_data_chunks = 1;
8176                                 chk->sent = SCTP_DATAGRAM_SENT;
8177                                 if (chk->whoTo == NULL) {
8178                                         chk->whoTo = net;
8179                                         atomic_add_int(&net->ref_count, 1);
8180                                 }
8181                                 chk->snd_count++;
8182                                 if (mtu == 0) {
8183                                         /*
8184                                          * Ok we are out of room but we can
8185                                          * output without effecting the
8186                                          * flight size since this little guy
8187                                          * is a control only packet.
8188                                          */
8189                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8190                                         /*
8191                                          * do NOT clear the asconf flag as
8192                                          * it is used to do appropriate
8193                                          * source address selection.
8194                                          */
8195                                         if (*now_filled == 0) {
8196                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8197                                                 *now_filled = 1;
8198                                         }
8199                                         net->last_sent_time = *now;
8200                                         hbflag = 0;
8201                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8202                                             (struct sockaddr *)&net->ro._l_addr,
8203                                             outchain, auth_offset, auth,
8204                                             stcb->asoc.authinfo.active_keyid,
8205                                             no_fragmentflg, 0, asconf,
8206                                             inp->sctp_lport, stcb->rport,
8207                                             htonl(stcb->asoc.peer_vtag),
8208                                             net->port, NULL,
8209                                             0, 0,
8210                                             so_locked))) {
8211                                                 /*
8212                                                  * error, we could not
8213                                                  * output
8214                                                  */
8215                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8216                                                 if (from_where == 0) {
8217                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8218                                                 }
8219                                                 if (error == ENOBUFS) {
8220                                                         asoc->ifp_had_enobuf = 1;
8221                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8222                                                 }
8223                                                 /* error, could not output */
8224                                                 if (error == EHOSTUNREACH) {
8225                                                         /*
8226                                                          * Destination went
8227                                                          * unreachable
8228                                                          * during this send
8229                                                          */
8230                                                         sctp_move_chunks_from_net(stcb, net);
8231                                                 }
8232                                                 *reason_code = 7;
8233                                                 break;
8234                                         } else {
8235                                                 asoc->ifp_had_enobuf = 0;
8236                                         }
8237                                         /*
8238                                          * increase the number we sent, if a
8239                                          * cookie is sent we don't tell them
8240                                          * any was sent out.
8241                                          */
8242                                         outchain = endoutchain = NULL;
8243                                         auth = NULL;
8244                                         auth_offset = 0;
8245                                         if (!no_out_cnt)
8246                                                 *num_out += ctl_cnt;
8247                                         /* recalc a clean slate and setup */
8248                                         switch (net->ro._l_addr.sa.sa_family) {
8249 #ifdef INET
8250                                         case AF_INET:
8251                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8252                                                 break;
8253 #endif
8254 #ifdef INET6
8255                                         case AF_INET6:
8256                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8257                                                 break;
8258 #endif
8259                                         default:
8260                                                 /* TSNH */
8261                                                 mtu = net->mtu;
8262                                                 break;
8263                                         }
8264                                         to_out = 0;
8265                                         no_fragmentflg = 1;
8266                                 }
8267                         }
8268                 }
8269                 if (error != 0) {
8270                         /* try next net */
8271                         continue;
8272                 }
8273                 /************************/
8274                 /* Control transmission */
8275                 /************************/
8276                 /* Now first lets go through the control queue */
8277                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8278                         if ((sack_goes_to) &&
8279                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8280                             (chk->whoTo != sack_goes_to)) {
8281                                 /*
8282                                  * if we have a sack in queue, and we are
8283                                  * looking at an ecn echo that is NOT queued
8284                                  * to where the sack is going..
8285                                  */
8286                                 if (chk->whoTo == net) {
8287                                         /*
8288                                          * Don't transmit it to where its
8289                                          * going (current net)
8290                                          */
8291                                         continue;
8292                                 } else if (sack_goes_to == net) {
8293                                         /*
8294                                          * But do transmit it to this
8295                                          * address
8296                                          */
8297                                         goto skip_net_check;
8298                                 }
8299                         }
8300                         if (chk->whoTo == NULL) {
8301                                 if (asoc->alternate == NULL) {
8302                                         if (asoc->primary_destination != net) {
8303                                                 continue;
8304                                         }
8305                                 } else {
8306                                         if (asoc->alternate != net) {
8307                                                 continue;
8308                                         }
8309                                 }
8310                         } else {
8311                                 if (chk->whoTo != net) {
8312                                         continue;
8313                                 }
8314                         }
8315         skip_net_check:
8316                         if (chk->data == NULL) {
8317                                 continue;
8318                         }
8319                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8320                                 /*
8321                                  * It must be unsent. Cookies and ASCONF's
8322                                  * hang around but there timers will force
8323                                  * when marked for resend.
8324                                  */
8325                                 continue;
8326                         }
8327                         /*
8328                          * if no AUTH is yet included and this chunk
8329                          * requires it, make sure to account for it.  We
8330                          * don't apply the size until the AUTH chunk is
8331                          * actually added below in case there is no room for
8332                          * this chunk. NOTE: we overload the use of "omtu"
8333                          * here
8334                          */
8335                         if ((auth == NULL) &&
8336                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8337                             stcb->asoc.peer_auth_chunks)) {
8338                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8339                         } else
8340                                 omtu = 0;
8341                         /* Here we do NOT factor the r_mtu */
8342                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8343                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8344                                 /*
8345                                  * We probably should glom the mbuf chain
8346                                  * from the chk->data for control but the
8347                                  * problem is it becomes yet one more level
8348                                  * of tracking to do if for some reason
8349                                  * output fails. Then I have got to
8350                                  * reconstruct the merged control chain.. el
8351                                  * yucko.. for now we take the easy way and
8352                                  * do the copy
8353                                  */
8354                                 /*
8355                                  * Add an AUTH chunk, if chunk requires it
8356                                  * save the offset into the chain for AUTH
8357                                  */
8358                                 if ((auth == NULL) &&
8359                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8360                                     stcb->asoc.peer_auth_chunks))) {
8361                                         outchain = sctp_add_auth_chunk(outchain,
8362                                             &endoutchain,
8363                                             &auth,
8364                                             &auth_offset,
8365                                             stcb,
8366                                             chk->rec.chunk_id.id);
8367                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8368                                 }
8369                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8370                                     (int)chk->rec.chunk_id.can_take_data,
8371                                     chk->send_size, chk->copy_by_ref);
8372                                 if (outchain == NULL) {
8373                                         *reason_code = 8;
8374                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8375                                         return (ENOMEM);
8376                                 }
8377                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8378                                 /* update our MTU size */
8379                                 if (mtu > (chk->send_size + omtu))
8380                                         mtu -= (chk->send_size + omtu);
8381                                 else
8382                                         mtu = 0;
8383                                 to_out += (chk->send_size + omtu);
8384                                 /* Do clear IP_DF ? */
8385                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8386                                         no_fragmentflg = 0;
8387                                 }
8388                                 if (chk->rec.chunk_id.can_take_data)
8389                                         chk->data = NULL;
8390                                 /* Mark things to be removed, if needed */
8391                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8392                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8393                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8394                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8395                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8396                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8397                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8398                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8399                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8400                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8401                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8402                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8403                                                 hbflag = 1;
8404                                         }
8405                                         /* remove these chunks at the end */
8406                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8407                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8408                                                 /* turn off the timer */
8409                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8410                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8411                                                             inp, stcb, net,
8412                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8413                                                 }
8414                                         }
8415                                         ctl_cnt++;
8416                                 } else {
8417                                         /*
8418                                          * Other chunks, since they have
8419                                          * timers running (i.e. COOKIE) we
8420                                          * just "trust" that it gets sent or
8421                                          * retransmitted.
8422                                          */
8423                                         ctl_cnt++;
8424                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8425                                                 cookie = 1;
8426                                                 no_out_cnt = 1;
8427                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8428                                                 /*
8429                                                  * Increment ecne send count
8430                                                  * here this means we may be
8431                                                  * over-zealous in our
8432                                                  * counting if the send
8433                                                  * fails, but its the best
8434                                                  * place to do it (we used
8435                                                  * to do it in the queue of
8436                                                  * the chunk, but that did
8437                                                  * not tell how many times
8438                                                  * it was sent.
8439                                                  */
8440                                                 SCTP_STAT_INCR(sctps_sendecne);
8441                                         }
8442                                         chk->sent = SCTP_DATAGRAM_SENT;
8443                                         if (chk->whoTo == NULL) {
8444                                                 chk->whoTo = net;
8445                                                 atomic_add_int(&net->ref_count, 1);
8446                                         }
8447                                         chk->snd_count++;
8448                                 }
8449                                 if (mtu == 0) {
8450                                         /*
8451                                          * Ok we are out of room but we can
8452                                          * output without effecting the
8453                                          * flight size since this little guy
8454                                          * is a control only packet.
8455                                          */
8456                                         if (asconf) {
8457                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8458                                                 /*
8459                                                  * do NOT clear the asconf
8460                                                  * flag as it is used to do
8461                                                  * appropriate source
8462                                                  * address selection.
8463                                                  */
8464                                         }
8465                                         if (cookie) {
8466                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8467                                                 cookie = 0;
8468                                         }
8469                                         /* Only HB or ASCONF advances time */
8470                                         if (hbflag) {
8471                                                 if (*now_filled == 0) {
8472                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8473                                                         *now_filled = 1;
8474                                                 }
8475                                                 net->last_sent_time = *now;
8476                                                 hbflag = 0;
8477                                         }
8478                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8479                                             (struct sockaddr *)&net->ro._l_addr,
8480                                             outchain,
8481                                             auth_offset, auth,
8482                                             stcb->asoc.authinfo.active_keyid,
8483                                             no_fragmentflg, 0, asconf,
8484                                             inp->sctp_lport, stcb->rport,
8485                                             htonl(stcb->asoc.peer_vtag),
8486                                             net->port, NULL,
8487                                             0, 0,
8488                                             so_locked))) {
8489                                                 /*
8490                                                  * error, we could not
8491                                                  * output
8492                                                  */
8493                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8494                                                 if (from_where == 0) {
8495                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8496                                                 }
8497                                                 if (error == ENOBUFS) {
8498                                                         asoc->ifp_had_enobuf = 1;
8499                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8500                                                 }
8501                                                 if (error == EHOSTUNREACH) {
8502                                                         /*
8503                                                          * Destination went
8504                                                          * unreachable
8505                                                          * during this send
8506                                                          */
8507                                                         sctp_move_chunks_from_net(stcb, net);
8508                                                 }
8509                                                 *reason_code = 7;
8510                                                 break;
8511                                         } else {
8512                                                 asoc->ifp_had_enobuf = 0;
8513                                         }
8514                                         /*
8515                                          * increase the number we sent, if a
8516                                          * cookie is sent we don't tell them
8517                                          * any was sent out.
8518                                          */
8519                                         outchain = endoutchain = NULL;
8520                                         auth = NULL;
8521                                         auth_offset = 0;
8522                                         if (!no_out_cnt)
8523                                                 *num_out += ctl_cnt;
8524                                         /* recalc a clean slate and setup */
8525                                         switch (net->ro._l_addr.sa.sa_family) {
8526 #ifdef INET
8527                                         case AF_INET:
8528                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8529                                                 break;
8530 #endif
8531 #ifdef INET6
8532                                         case AF_INET6:
8533                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8534                                                 break;
8535 #endif
8536                                         default:
8537                                                 /* TSNH */
8538                                                 mtu = net->mtu;
8539                                                 break;
8540                                         }
8541                                         to_out = 0;
8542                                         no_fragmentflg = 1;
8543                                 }
8544                         }
8545                 }
8546                 if (error != 0) {
8547                         /* try next net */
8548                         continue;
8549                 }
8550                 /* JRI: if dest is in PF state, do not send data to it */
8551                 if ((asoc->sctp_cmt_on_off > 0) &&
8552                     (net != stcb->asoc.alternate) &&
8553                     (net->dest_state & SCTP_ADDR_PF)) {
8554                         goto no_data_fill;
8555                 }
8556                 if (net->flight_size >= net->cwnd) {
8557                         goto no_data_fill;
8558                 }
8559                 if ((asoc->sctp_cmt_on_off > 0) &&
8560                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8561                     (net->flight_size > max_rwnd_per_dest)) {
8562                         goto no_data_fill;
8563                 }
8564                 /*
8565                  * We need a specific accounting for the usage of the send
8566                  * buffer. We also need to check the number of messages per
8567                  * net. For now, this is better than nothing and it disabled
8568                  * by default...
8569                  */
8570                 if ((asoc->sctp_cmt_on_off > 0) &&
8571                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8572                     (max_send_per_dest > 0) &&
8573                     (net->flight_size > max_send_per_dest)) {
8574                         goto no_data_fill;
8575                 }
8576                 /*********************/
8577                 /* Data transmission */
8578                 /*********************/
8579                 /*
8580                  * if AUTH for DATA is required and no AUTH has been added
8581                  * yet, account for this in the mtu now... if no data can be
8582                  * bundled, this adjustment won't matter anyways since the
8583                  * packet will be going out...
8584                  */
8585                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8586                     stcb->asoc.peer_auth_chunks);
8587                 if (data_auth_reqd && (auth == NULL)) {
8588                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8589                 }
8590                 /* now lets add any data within the MTU constraints */
8591                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8592 #ifdef INET
8593                 case AF_INET:
8594                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8595                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8596                         else
8597                                 omtu = 0;
8598                         break;
8599 #endif
8600 #ifdef INET6
8601                 case AF_INET6:
8602                         if (net->mtu > SCTP_MIN_OVERHEAD)
8603                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8604                         else
8605                                 omtu = 0;
8606                         break;
8607 #endif
8608                 default:
8609                         /* TSNH */
8610                         omtu = 0;
8611                         break;
8612                 }
8613                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8614                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8615                     (skip_data_for_this_net == 0)) ||
8616                     (cookie)) {
8617                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8618                                 if (no_data_chunks) {
8619                                         /* let only control go out */
8620                                         *reason_code = 1;
8621                                         break;
8622                                 }
8623                                 if (net->flight_size >= net->cwnd) {
8624                                         /* skip this net, no room for data */
8625                                         *reason_code = 2;
8626                                         break;
8627                                 }
8628                                 if ((chk->whoTo != NULL) &&
8629                                     (chk->whoTo != net)) {
8630                                         /* Don't send the chunk on this net */
8631                                         continue;
8632                                 }
8633
8634                                 if (asoc->sctp_cmt_on_off == 0) {
8635                                         if ((asoc->alternate) &&
8636                                             (asoc->alternate != net) &&
8637                                             (chk->whoTo == NULL)) {
8638                                                 continue;
8639                                         } else if ((net != asoc->primary_destination) &&
8640                                                     (asoc->alternate == NULL) &&
8641                                             (chk->whoTo == NULL)) {
8642                                                 continue;
8643                                         }
8644                                 }
8645                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8646                                         /*-
8647                                          * strange, we have a chunk that is
8648                                          * to big for its destination and
8649                                          * yet no fragment ok flag.
8650                                          * Something went wrong when the
8651                                          * PMTU changed...we did not mark
8652                                          * this chunk for some reason?? I
8653                                          * will fix it here by letting IP
8654                                          * fragment it for now and printing
8655                                          * a warning. This really should not
8656                                          * happen ...
8657                                          */
8658                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8659                                             chk->send_size, mtu);
8660                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8661                                 }
8662                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8663                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8664                                         struct sctp_data_chunk *dchkh;
8665
8666                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8667                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8668                                 }
8669                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8670                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8671                                         /* ok we will add this one */
8672
8673                                         /*
8674                                          * Add an AUTH chunk, if chunk
8675                                          * requires it, save the offset into
8676                                          * the chain for AUTH
8677                                          */
8678                                         if (data_auth_reqd) {
8679                                                 if (auth == NULL) {
8680                                                         outchain = sctp_add_auth_chunk(outchain,
8681                                                             &endoutchain,
8682                                                             &auth,
8683                                                             &auth_offset,
8684                                                             stcb,
8685                                                             SCTP_DATA);
8686                                                         auth_keyid = chk->auth_keyid;
8687                                                         override_ok = 0;
8688                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8689                                                 } else if (override_ok) {
8690                                                         /*
8691                                                          * use this data's
8692                                                          * keyid
8693                                                          */
8694                                                         auth_keyid = chk->auth_keyid;
8695                                                         override_ok = 0;
8696                                                 } else if (auth_keyid != chk->auth_keyid) {
8697                                                         /*
8698                                                          * different keyid,
8699                                                          * so done bundling
8700                                                          */
8701                                                         break;
8702                                                 }
8703                                         }
8704                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8705                                             chk->send_size, chk->copy_by_ref);
8706                                         if (outchain == NULL) {
8707                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8708                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8709                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8710                                                 }
8711                                                 *reason_code = 3;
8712                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8713                                                 return (ENOMEM);
8714                                         }
8715                                         /* upate our MTU size */
8716                                         /* Do clear IP_DF ? */
8717                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8718                                                 no_fragmentflg = 0;
8719                                         }
8720                                         /* unsigned subtraction of mtu */
8721                                         if (mtu > chk->send_size)
8722                                                 mtu -= chk->send_size;
8723                                         else
8724                                                 mtu = 0;
8725                                         /* unsigned subtraction of r_mtu */
8726                                         if (r_mtu > chk->send_size)
8727                                                 r_mtu -= chk->send_size;
8728                                         else
8729                                                 r_mtu = 0;
8730
8731                                         to_out += chk->send_size;
8732                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8733 #ifdef INVARIANTS
8734                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8735 #else
8736                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8737                                                     mx_mtu, to_out);
8738 #endif
8739                                         }
8740                                         chk->window_probe = 0;
8741                                         data_list[bundle_at++] = chk;
8742                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8743                                                 break;
8744                                         }
8745                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8746                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8747                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8748                                                 } else {
8749                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8750                                                 }
8751                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8752                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8753                                                         /*
8754                                                          * Count number of
8755                                                          * user msg's that
8756                                                          * were fragmented
8757                                                          * we do this by
8758                                                          * counting when we
8759                                                          * see a LAST
8760                                                          * fragment only.
8761                                                          */
8762                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8763                                         }
8764                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8765                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8766                                                         data_list[0]->window_probe = 1;
8767                                                         net->window_probe = 1;
8768                                                 }
8769                                                 break;
8770                                         }
8771                                 } else {
8772                                         /*
8773                                          * Must be sent in order of the
8774                                          * TSN's (on a network)
8775                                          */
8776                                         break;
8777                                 }
8778                         }       /* for (chunk gather loop for this net) */
8779                 }               /* if asoc.state OPEN */
8780 no_data_fill:
8781                 /* Is there something to send for this destination? */
8782                 if (outchain) {
8783                         /* We may need to start a control timer or two */
8784                         if (asconf) {
8785                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8786                                     stcb, net);
8787                                 /*
8788                                  * do NOT clear the asconf flag as it is
8789                                  * used to do appropriate source address
8790                                  * selection.
8791                                  */
8792                         }
8793                         if (cookie) {
8794                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8795                                 cookie = 0;
8796                         }
8797                         /* must start a send timer if data is being sent */
8798                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8799                                 /*
8800                                  * no timer running on this destination
8801                                  * restart it.
8802                                  */
8803                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8804                         }
8805                         if (bundle_at || hbflag) {
8806                                 /* For data/asconf and hb set time */
8807                                 if (*now_filled == 0) {
8808                                         (void)SCTP_GETTIME_TIMEVAL(now);
8809                                         *now_filled = 1;
8810                                 }
8811                                 net->last_sent_time = *now;
8812                         }
8813                         /* Now send it, if there is anything to send :> */
8814                         if ((error = sctp_lowlevel_chunk_output(inp,
8815                             stcb,
8816                             net,
8817                             (struct sockaddr *)&net->ro._l_addr,
8818                             outchain,
8819                             auth_offset,
8820                             auth,
8821                             auth_keyid,
8822                             no_fragmentflg,
8823                             bundle_at,
8824                             asconf,
8825                             inp->sctp_lport, stcb->rport,
8826                             htonl(stcb->asoc.peer_vtag),
8827                             net->port, NULL,
8828                             0, 0,
8829                             so_locked))) {
8830                                 /* error, we could not output */
8831                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8832                                 if (from_where == 0) {
8833                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8834                                 }
8835                                 if (error == ENOBUFS) {
8836                                         asoc->ifp_had_enobuf = 1;
8837                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8838                                 }
8839                                 if (error == EHOSTUNREACH) {
8840                                         /*
8841                                          * Destination went unreachable
8842                                          * during this send
8843                                          */
8844                                         sctp_move_chunks_from_net(stcb, net);
8845                                 }
8846                                 *reason_code = 6;
8847                                 /*-
8848                                  * I add this line to be paranoid. As far as
8849                                  * I can tell the continue, takes us back to
8850                                  * the top of the for, but just to make sure
8851                                  * I will reset these again here.
8852                                  */
8853                                 ctl_cnt = bundle_at = 0;
8854                                 continue;       /* This takes us back to the
8855                                                  * for() for the nets. */
8856                         } else {
8857                                 asoc->ifp_had_enobuf = 0;
8858                         }
8859                         endoutchain = NULL;
8860                         auth = NULL;
8861                         auth_offset = 0;
8862                         if (!no_out_cnt) {
8863                                 *num_out += (ctl_cnt + bundle_at);
8864                         }
8865                         if (bundle_at) {
8866                                 /* setup for a RTO measurement */
8867                                 tsns_sent = data_list[0]->rec.data.tsn;
8868                                 /* fill time if not already filled */
8869                                 if (*now_filled == 0) {
8870                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8871                                         *now_filled = 1;
8872                                         *now = asoc->time_last_sent;
8873                                 } else {
8874                                         asoc->time_last_sent = *now;
8875                                 }
8876                                 if (net->rto_needed) {
8877                                         data_list[0]->do_rtt = 1;
8878                                         net->rto_needed = 0;
8879                                 }
8880                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8881                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8882                         }
8883                         if (one_chunk) {
8884                                 break;
8885                         }
8886                 }
8887                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8888                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8889                 }
8890         }
8891         if (old_start_at == NULL) {
8892                 old_start_at = start_at;
8893                 start_at = TAILQ_FIRST(&asoc->nets);
8894                 if (old_start_at)
8895                         goto again_one_more_time;
8896         }
8897
8898         /*
8899          * At the end there should be no NON timed chunks hanging on this
8900          * queue.
8901          */
8902         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8903                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8904         }
8905         if ((*num_out == 0) && (*reason_code == 0)) {
8906                 *reason_code = 4;
8907         } else {
8908                 *reason_code = 5;
8909         }
8910         sctp_clean_up_ctl(stcb, asoc, so_locked);
8911         return (0);
8912 }
8913
8914 void
8915 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8916 {
8917         /*-
8918          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8919          * the control chunk queue.
8920          */
8921         struct sctp_chunkhdr *hdr;
8922         struct sctp_tmit_chunk *chk;
8923         struct mbuf *mat, *last_mbuf;
8924         uint32_t chunk_length;
8925         uint16_t padding_length;
8926
8927         SCTP_TCB_LOCK_ASSERT(stcb);
8928         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8929         if (op_err == NULL) {
8930                 return;
8931         }
8932         last_mbuf = NULL;
8933         chunk_length = 0;
8934         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8935                 chunk_length += SCTP_BUF_LEN(mat);
8936                 if (SCTP_BUF_NEXT(mat) == NULL) {
8937                         last_mbuf = mat;
8938                 }
8939         }
8940         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8941                 sctp_m_freem(op_err);
8942                 return;
8943         }
8944         padding_length = chunk_length % 4;
8945         if (padding_length != 0) {
8946                 padding_length = 4 - padding_length;
8947         }
8948         if (padding_length != 0) {
8949                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8950                         sctp_m_freem(op_err);
8951                         return;
8952                 }
8953         }
8954         sctp_alloc_a_chunk(stcb, chk);
8955         if (chk == NULL) {
8956                 /* no memory */
8957                 sctp_m_freem(op_err);
8958                 return;
8959         }
8960         chk->copy_by_ref = 0;
8961         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8962         chk->rec.chunk_id.can_take_data = 0;
8963         chk->flags = 0;
8964         chk->send_size = (uint16_t)chunk_length;
8965         chk->sent = SCTP_DATAGRAM_UNSENT;
8966         chk->snd_count = 0;
8967         chk->asoc = &stcb->asoc;
8968         chk->data = op_err;
8969         chk->whoTo = NULL;
8970         hdr = mtod(op_err, struct sctp_chunkhdr *);
8971         hdr->chunk_type = SCTP_OPERATION_ERROR;
8972         hdr->chunk_flags = 0;
8973         hdr->chunk_length = htons(chk->send_size);
8974         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8975         chk->asoc->ctrl_queue_cnt++;
8976 }
8977
8978 int
8979 sctp_send_cookie_echo(struct mbuf *m,
8980     int offset,
8981     struct sctp_tcb *stcb,
8982     struct sctp_nets *net)
8983 {
8984         /*-
8985          * pull out the cookie and put it at the front of the control chunk
8986          * queue.
8987          */
8988         int at;
8989         struct mbuf *cookie;
8990         struct sctp_paramhdr param, *phdr;
8991         struct sctp_chunkhdr *hdr;
8992         struct sctp_tmit_chunk *chk;
8993         uint16_t ptype, plen;
8994
8995         SCTP_TCB_LOCK_ASSERT(stcb);
8996         /* First find the cookie in the param area */
8997         cookie = NULL;
8998         at = offset + sizeof(struct sctp_init_chunk);
8999         for (;;) {
9000                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9001                 if (phdr == NULL) {
9002                         return (-3);
9003                 }
9004                 ptype = ntohs(phdr->param_type);
9005                 plen = ntohs(phdr->param_length);
9006                 if (ptype == SCTP_STATE_COOKIE) {
9007                         int pad;
9008
9009                         /* found the cookie */
9010                         if ((pad = (plen % 4))) {
9011                                 plen += 4 - pad;
9012                         }
9013                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9014                         if (cookie == NULL) {
9015                                 /* No memory */
9016                                 return (-2);
9017                         }
9018 #ifdef SCTP_MBUF_LOGGING
9019                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9020                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9021                         }
9022 #endif
9023                         break;
9024                 }
9025                 at += SCTP_SIZE32(plen);
9026         }
9027         /* ok, we got the cookie lets change it into a cookie echo chunk */
9028         /* first the change from param to cookie */
9029         hdr = mtod(cookie, struct sctp_chunkhdr *);
9030         hdr->chunk_type = SCTP_COOKIE_ECHO;
9031         hdr->chunk_flags = 0;
9032         /* get the chunk stuff now and place it in the FRONT of the queue */
9033         sctp_alloc_a_chunk(stcb, chk);
9034         if (chk == NULL) {
9035                 /* no memory */
9036                 sctp_m_freem(cookie);
9037                 return (-5);
9038         }
9039         chk->copy_by_ref = 0;
9040         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9041         chk->rec.chunk_id.can_take_data = 0;
9042         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9043         chk->send_size = plen;
9044         chk->sent = SCTP_DATAGRAM_UNSENT;
9045         chk->snd_count = 0;
9046         chk->asoc = &stcb->asoc;
9047         chk->data = cookie;
9048         chk->whoTo = net;
9049         atomic_add_int(&chk->whoTo->ref_count, 1);
9050         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9051         chk->asoc->ctrl_queue_cnt++;
9052         return (0);
9053 }
9054
9055 void
9056 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9057     struct mbuf *m,
9058     int offset,
9059     int chk_length,
9060     struct sctp_nets *net)
9061 {
9062         /*
9063          * take a HB request and make it into a HB ack and send it.
9064          */
9065         struct mbuf *outchain;
9066         struct sctp_chunkhdr *chdr;
9067         struct sctp_tmit_chunk *chk;
9068
9069
9070         if (net == NULL)
9071                 /* must have a net pointer */
9072                 return;
9073
9074         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9075         if (outchain == NULL) {
9076                 /* gak out of memory */
9077                 return;
9078         }
9079 #ifdef SCTP_MBUF_LOGGING
9080         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9081                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9082         }
9083 #endif
9084         chdr = mtod(outchain, struct sctp_chunkhdr *);
9085         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9086         chdr->chunk_flags = 0;
9087         if (chk_length % 4) {
9088                 /* need pad */
9089                 uint32_t cpthis = 0;
9090                 int padlen;
9091
9092                 padlen = 4 - (chk_length % 4);
9093                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9094         }
9095         sctp_alloc_a_chunk(stcb, chk);
9096         if (chk == NULL) {
9097                 /* no memory */
9098                 sctp_m_freem(outchain);
9099                 return;
9100         }
9101         chk->copy_by_ref = 0;
9102         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9103         chk->rec.chunk_id.can_take_data = 1;
9104         chk->flags = 0;
9105         chk->send_size = chk_length;
9106         chk->sent = SCTP_DATAGRAM_UNSENT;
9107         chk->snd_count = 0;
9108         chk->asoc = &stcb->asoc;
9109         chk->data = outchain;
9110         chk->whoTo = net;
9111         atomic_add_int(&chk->whoTo->ref_count, 1);
9112         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9113         chk->asoc->ctrl_queue_cnt++;
9114 }
9115
9116 void
9117 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9118 {
9119         /* formulate and queue a cookie-ack back to sender */
9120         struct mbuf *cookie_ack;
9121         struct sctp_chunkhdr *hdr;
9122         struct sctp_tmit_chunk *chk;
9123
9124         SCTP_TCB_LOCK_ASSERT(stcb);
9125
9126         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9127         if (cookie_ack == NULL) {
9128                 /* no mbuf's */
9129                 return;
9130         }
9131         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9132         sctp_alloc_a_chunk(stcb, chk);
9133         if (chk == NULL) {
9134                 /* no memory */
9135                 sctp_m_freem(cookie_ack);
9136                 return;
9137         }
9138         chk->copy_by_ref = 0;
9139         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9140         chk->rec.chunk_id.can_take_data = 1;
9141         chk->flags = 0;
9142         chk->send_size = sizeof(struct sctp_chunkhdr);
9143         chk->sent = SCTP_DATAGRAM_UNSENT;
9144         chk->snd_count = 0;
9145         chk->asoc = &stcb->asoc;
9146         chk->data = cookie_ack;
9147         if (chk->asoc->last_control_chunk_from != NULL) {
9148                 chk->whoTo = chk->asoc->last_control_chunk_from;
9149                 atomic_add_int(&chk->whoTo->ref_count, 1);
9150         } else {
9151                 chk->whoTo = NULL;
9152         }
9153         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9154         hdr->chunk_type = SCTP_COOKIE_ACK;
9155         hdr->chunk_flags = 0;
9156         hdr->chunk_length = htons(chk->send_size);
9157         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9158         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9159         chk->asoc->ctrl_queue_cnt++;
9160         return;
9161 }
9162
9163
9164 void
9165 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9166 {
9167         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9168         struct mbuf *m_shutdown_ack;
9169         struct sctp_shutdown_ack_chunk *ack_cp;
9170         struct sctp_tmit_chunk *chk;
9171
9172         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9173         if (m_shutdown_ack == NULL) {
9174                 /* no mbuf's */
9175                 return;
9176         }
9177         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9178         sctp_alloc_a_chunk(stcb, chk);
9179         if (chk == NULL) {
9180                 /* no memory */
9181                 sctp_m_freem(m_shutdown_ack);
9182                 return;
9183         }
9184         chk->copy_by_ref = 0;
9185         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9186         chk->rec.chunk_id.can_take_data = 1;
9187         chk->flags = 0;
9188         chk->send_size = sizeof(struct sctp_chunkhdr);
9189         chk->sent = SCTP_DATAGRAM_UNSENT;
9190         chk->snd_count = 0;
9191         chk->asoc = &stcb->asoc;
9192         chk->data = m_shutdown_ack;
9193         chk->whoTo = net;
9194         if (chk->whoTo) {
9195                 atomic_add_int(&chk->whoTo->ref_count, 1);
9196         }
9197         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9198         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9199         ack_cp->ch.chunk_flags = 0;
9200         ack_cp->ch.chunk_length = htons(chk->send_size);
9201         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9202         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9203         chk->asoc->ctrl_queue_cnt++;
9204         return;
9205 }
9206
9207 void
9208 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9209 {
9210         /* formulate and queue a SHUTDOWN to the sender */
9211         struct mbuf *m_shutdown;
9212         struct sctp_shutdown_chunk *shutdown_cp;
9213         struct sctp_tmit_chunk *chk;
9214
9215         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9216                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9217                         /* We already have a SHUTDOWN queued. Reuse it. */
9218                         if (chk->whoTo) {
9219                                 sctp_free_remote_addr(chk->whoTo);
9220                                 chk->whoTo = NULL;
9221                         }
9222                         break;
9223                 }
9224         }
9225         if (chk == NULL) {
9226                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9227                 if (m_shutdown == NULL) {
9228                         /* no mbuf's */
9229                         return;
9230                 }
9231                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9232                 sctp_alloc_a_chunk(stcb, chk);
9233                 if (chk == NULL) {
9234                         /* no memory */
9235                         sctp_m_freem(m_shutdown);
9236                         return;
9237                 }
9238                 chk->copy_by_ref = 0;
9239                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9240                 chk->rec.chunk_id.can_take_data = 1;
9241                 chk->flags = 0;
9242                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9243                 chk->sent = SCTP_DATAGRAM_UNSENT;
9244                 chk->snd_count = 0;
9245                 chk->asoc = &stcb->asoc;
9246                 chk->data = m_shutdown;
9247                 chk->whoTo = net;
9248                 if (chk->whoTo) {
9249                         atomic_add_int(&chk->whoTo->ref_count, 1);
9250                 }
9251                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9252                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9253                 shutdown_cp->ch.chunk_flags = 0;
9254                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9255                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9256                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9257                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9258                 chk->asoc->ctrl_queue_cnt++;
9259         } else {
9260                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9261                 chk->whoTo = net;
9262                 if (chk->whoTo) {
9263                         atomic_add_int(&chk->whoTo->ref_count, 1);
9264                 }
9265                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9266                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9267                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9268         }
9269         return;
9270 }
9271
9272 void
9273 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9274 {
9275         /*
9276          * formulate and queue an ASCONF to the peer. ASCONF parameters
9277          * should be queued on the assoc queue.
9278          */
9279         struct sctp_tmit_chunk *chk;
9280         struct mbuf *m_asconf;
9281         int len;
9282
9283         SCTP_TCB_LOCK_ASSERT(stcb);
9284
9285         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9286             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9287                 /* can't send a new one if there is one in flight already */
9288                 return;
9289         }
9290
9291         /* compose an ASCONF chunk, maximum length is PMTU */
9292         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9293         if (m_asconf == NULL) {
9294                 return;
9295         }
9296
9297         sctp_alloc_a_chunk(stcb, chk);
9298         if (chk == NULL) {
9299                 /* no memory */
9300                 sctp_m_freem(m_asconf);
9301                 return;
9302         }
9303
9304         chk->copy_by_ref = 0;
9305         chk->rec.chunk_id.id = SCTP_ASCONF;
9306         chk->rec.chunk_id.can_take_data = 0;
9307         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9308         chk->data = m_asconf;
9309         chk->send_size = len;
9310         chk->sent = SCTP_DATAGRAM_UNSENT;
9311         chk->snd_count = 0;
9312         chk->asoc = &stcb->asoc;
9313         chk->whoTo = net;
9314         if (chk->whoTo) {
9315                 atomic_add_int(&chk->whoTo->ref_count, 1);
9316         }
9317         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9318         chk->asoc->ctrl_queue_cnt++;
9319         return;
9320 }
9321
9322 void
9323 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9324 {
9325         /*
9326          * formulate and queue a asconf-ack back to sender. the asconf-ack
9327          * must be stored in the tcb.
9328          */
9329         struct sctp_tmit_chunk *chk;
9330         struct sctp_asconf_ack *ack, *latest_ack;
9331         struct mbuf *m_ack;
9332         struct sctp_nets *net = NULL;
9333
9334         SCTP_TCB_LOCK_ASSERT(stcb);
9335         /* Get the latest ASCONF-ACK */
9336         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9337         if (latest_ack == NULL) {
9338                 return;
9339         }
9340         if (latest_ack->last_sent_to != NULL &&
9341             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9342                 /* we're doing a retransmission */
9343                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9344                 if (net == NULL) {
9345                         /* no alternate */
9346                         if (stcb->asoc.last_control_chunk_from == NULL) {
9347                                 if (stcb->asoc.alternate) {
9348                                         net = stcb->asoc.alternate;
9349                                 } else {
9350                                         net = stcb->asoc.primary_destination;
9351                                 }
9352                         } else {
9353                                 net = stcb->asoc.last_control_chunk_from;
9354                         }
9355                 }
9356         } else {
9357                 /* normal case */
9358                 if (stcb->asoc.last_control_chunk_from == NULL) {
9359                         if (stcb->asoc.alternate) {
9360                                 net = stcb->asoc.alternate;
9361                         } else {
9362                                 net = stcb->asoc.primary_destination;
9363                         }
9364                 } else {
9365                         net = stcb->asoc.last_control_chunk_from;
9366                 }
9367         }
9368         latest_ack->last_sent_to = net;
9369
9370         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9371                 if (ack->data == NULL) {
9372                         continue;
9373                 }
9374
9375                 /* copy the asconf_ack */
9376                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9377                 if (m_ack == NULL) {
9378                         /* couldn't copy it */
9379                         return;
9380                 }
9381 #ifdef SCTP_MBUF_LOGGING
9382                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9383                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9384                 }
9385 #endif
9386
9387                 sctp_alloc_a_chunk(stcb, chk);
9388                 if (chk == NULL) {
9389                         /* no memory */
9390                         if (m_ack)
9391                                 sctp_m_freem(m_ack);
9392                         return;
9393                 }
9394                 chk->copy_by_ref = 0;
9395                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9396                 chk->rec.chunk_id.can_take_data = 1;
9397                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9398                 chk->whoTo = net;
9399                 if (chk->whoTo) {
9400                         atomic_add_int(&chk->whoTo->ref_count, 1);
9401                 }
9402                 chk->data = m_ack;
9403                 chk->send_size = ack->len;
9404                 chk->sent = SCTP_DATAGRAM_UNSENT;
9405                 chk->snd_count = 0;
9406                 chk->asoc = &stcb->asoc;
9407
9408                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9409                 chk->asoc->ctrl_queue_cnt++;
9410         }
9411         return;
9412 }
9413
9414
9415 static int
9416 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9417     struct sctp_tcb *stcb,
9418     struct sctp_association *asoc,
9419     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9420 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9421     SCTP_UNUSED
9422 #endif
9423 )
9424 {
9425         /*-
9426          * send out one MTU of retransmission. If fast_retransmit is
9427          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9428          * rwnd. For a Cookie or Asconf in the control chunk queue we
9429          * retransmit them by themselves.
9430          *
9431          * For data chunks we will pick out the lowest TSN's in the sent_queue
9432          * marked for resend and bundle them all together (up to a MTU of
9433          * destination). The address to send to should have been
9434          * selected/changed where the retransmission was marked (i.e. in FR
9435          * or t3-timeout routines).
9436          */
9437         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9438         struct sctp_tmit_chunk *chk, *fwd;
9439         struct mbuf *m, *endofchain;
9440         struct sctp_nets *net = NULL;
9441         uint32_t tsns_sent = 0;
9442         int no_fragmentflg, bundle_at, cnt_thru;
9443         unsigned int mtu;
9444         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9445         struct sctp_auth_chunk *auth = NULL;
9446         uint32_t auth_offset = 0;
9447         uint16_t auth_keyid;
9448         int override_ok = 1;
9449         int data_auth_reqd = 0;
9450         uint32_t dmtu = 0;
9451
9452         SCTP_TCB_LOCK_ASSERT(stcb);
9453         tmr_started = ctl_cnt = bundle_at = error = 0;
9454         no_fragmentflg = 1;
9455         fwd_tsn = 0;
9456         *cnt_out = 0;
9457         fwd = NULL;
9458         endofchain = m = NULL;
9459         auth_keyid = stcb->asoc.authinfo.active_keyid;
9460 #ifdef SCTP_AUDITING_ENABLED
9461         sctp_audit_log(0xC3, 1);
9462 #endif
9463         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9464             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9465                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9466                     asoc->sent_queue_retran_cnt);
9467                 asoc->sent_queue_cnt = 0;
9468                 asoc->sent_queue_cnt_removeable = 0;
9469                 /* send back 0/0 so we enter normal transmission */
9470                 *cnt_out = 0;
9471                 return (0);
9472         }
9473         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9474                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9475                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9476                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9477                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9478                                 continue;
9479                         }
9480                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9481                                 if (chk != asoc->str_reset) {
9482                                         /*
9483                                          * not eligible for retran if its
9484                                          * not ours
9485                                          */
9486                                         continue;
9487                                 }
9488                         }
9489                         ctl_cnt++;
9490                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9491                                 fwd_tsn = 1;
9492                         }
9493                         /*
9494                          * Add an AUTH chunk, if chunk requires it save the
9495                          * offset into the chain for AUTH
9496                          */
9497                         if ((auth == NULL) &&
9498                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9499                             stcb->asoc.peer_auth_chunks))) {
9500                                 m = sctp_add_auth_chunk(m, &endofchain,
9501                                     &auth, &auth_offset,
9502                                     stcb,
9503                                     chk->rec.chunk_id.id);
9504                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9505                         }
9506                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9507                         break;
9508                 }
9509         }
9510         one_chunk = 0;
9511         cnt_thru = 0;
9512         /* do we have control chunks to retransmit? */
9513         if (m != NULL) {
9514                 /* Start a timer no matter if we succeed or fail */
9515                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9516                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9517                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9518                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9519                 chk->snd_count++;       /* update our count */
9520                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9521                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9522                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9523                     no_fragmentflg, 0, 0,
9524                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9525                     chk->whoTo->port, NULL,
9526                     0, 0,
9527                     so_locked))) {
9528                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9529                         if (error == ENOBUFS) {
9530                                 asoc->ifp_had_enobuf = 1;
9531                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9532                         }
9533                         return (error);
9534                 } else {
9535                         asoc->ifp_had_enobuf = 0;
9536                 }
9537                 endofchain = NULL;
9538                 auth = NULL;
9539                 auth_offset = 0;
9540                 /*
9541                  * We don't want to mark the net->sent time here since this
9542                  * we use this for HB and retrans cannot measure RTT
9543                  */
9544                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9545                 *cnt_out += 1;
9546                 chk->sent = SCTP_DATAGRAM_SENT;
9547                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9548                 if (fwd_tsn == 0) {
9549                         return (0);
9550                 } else {
9551                         /* Clean up the fwd-tsn list */
9552                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9553                         return (0);
9554                 }
9555         }
9556         /*
9557          * Ok, it is just data retransmission we need to do or that and a
9558          * fwd-tsn with it all.
9559          */
9560         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9561                 return (SCTP_RETRAN_DONE);
9562         }
9563         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9564             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9565                 /* not yet open, resend the cookie and that is it */
9566                 return (1);
9567         }
9568 #ifdef SCTP_AUDITING_ENABLED
9569         sctp_auditing(20, inp, stcb, NULL);
9570 #endif
9571         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9572         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9573                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9574                         /* No, not sent to this net or not ready for rtx */
9575                         continue;
9576                 }
9577                 if (chk->data == NULL) {
9578                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9579                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9580                         continue;
9581                 }
9582                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9583                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9584                         struct mbuf *op_err;
9585                         char msg[SCTP_DIAG_INFO_LEN];
9586
9587                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9588                             chk->rec.data.tsn, chk->snd_count);
9589                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9590                             msg);
9591                         atomic_add_int(&stcb->asoc.refcnt, 1);
9592                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9593                             so_locked);
9594                         SCTP_TCB_LOCK(stcb);
9595                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9596                         return (SCTP_RETRAN_EXIT);
9597                 }
9598                 /* pick up the net */
9599                 net = chk->whoTo;
9600                 switch (net->ro._l_addr.sa.sa_family) {
9601 #ifdef INET
9602                 case AF_INET:
9603                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9604                         break;
9605 #endif
9606 #ifdef INET6
9607                 case AF_INET6:
9608                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9609                         break;
9610 #endif
9611                 default:
9612                         /* TSNH */
9613                         mtu = net->mtu;
9614                         break;
9615                 }
9616
9617                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9618                         /* No room in peers rwnd */
9619                         uint32_t tsn;
9620
9621                         tsn = asoc->last_acked_seq + 1;
9622                         if (tsn == chk->rec.data.tsn) {
9623                                 /*
9624                                  * we make a special exception for this
9625                                  * case. The peer has no rwnd but is missing
9626                                  * the lowest chunk.. which is probably what
9627                                  * is holding up the rwnd.
9628                                  */
9629                                 goto one_chunk_around;
9630                         }
9631                         return (1);
9632                 }
9633 one_chunk_around:
9634                 if (asoc->peers_rwnd < mtu) {
9635                         one_chunk = 1;
9636                         if ((asoc->peers_rwnd == 0) &&
9637                             (asoc->total_flight == 0)) {
9638                                 chk->window_probe = 1;
9639                                 chk->whoTo->window_probe = 1;
9640                         }
9641                 }
9642 #ifdef SCTP_AUDITING_ENABLED
9643                 sctp_audit_log(0xC3, 2);
9644 #endif
9645                 bundle_at = 0;
9646                 m = NULL;
9647                 net->fast_retran_ip = 0;
9648                 if (chk->rec.data.doing_fast_retransmit == 0) {
9649                         /*
9650                          * if no FR in progress skip destination that have
9651                          * flight_size > cwnd.
9652                          */
9653                         if (net->flight_size >= net->cwnd) {
9654                                 continue;
9655                         }
9656                 } else {
9657                         /*
9658                          * Mark the destination net to have FR recovery
9659                          * limits put on it.
9660                          */
9661                         *fr_done = 1;
9662                         net->fast_retran_ip = 1;
9663                 }
9664
9665                 /*
9666                  * if no AUTH is yet included and this chunk requires it,
9667                  * make sure to account for it.  We don't apply the size
9668                  * until the AUTH chunk is actually added below in case
9669                  * there is no room for this chunk.
9670                  */
9671                 if (data_auth_reqd && (auth == NULL)) {
9672                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9673                 } else
9674                         dmtu = 0;
9675
9676                 if ((chk->send_size <= (mtu - dmtu)) ||
9677                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9678                         /* ok we will add this one */
9679                         if (data_auth_reqd) {
9680                                 if (auth == NULL) {
9681                                         m = sctp_add_auth_chunk(m,
9682                                             &endofchain,
9683                                             &auth,
9684                                             &auth_offset,
9685                                             stcb,
9686                                             SCTP_DATA);
9687                                         auth_keyid = chk->auth_keyid;
9688                                         override_ok = 0;
9689                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9690                                 } else if (override_ok) {
9691                                         auth_keyid = chk->auth_keyid;
9692                                         override_ok = 0;
9693                                 } else if (chk->auth_keyid != auth_keyid) {
9694                                         /* different keyid, so done bundling */
9695                                         break;
9696                                 }
9697                         }
9698                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9699                         if (m == NULL) {
9700                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9701                                 return (ENOMEM);
9702                         }
9703                         /* Do clear IP_DF ? */
9704                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9705                                 no_fragmentflg = 0;
9706                         }
9707                         /* upate our MTU size */
9708                         if (mtu > (chk->send_size + dmtu))
9709                                 mtu -= (chk->send_size + dmtu);
9710                         else
9711                                 mtu = 0;
9712                         data_list[bundle_at++] = chk;
9713                         if (one_chunk && (asoc->total_flight <= 0)) {
9714                                 SCTP_STAT_INCR(sctps_windowprobed);
9715                         }
9716                 }
9717                 if (one_chunk == 0) {
9718                         /*
9719                          * now are there anymore forward from chk to pick
9720                          * up?
9721                          */
9722                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9723                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9724                                         /* Nope, not for retran */
9725                                         continue;
9726                                 }
9727                                 if (fwd->whoTo != net) {
9728                                         /* Nope, not the net in question */
9729                                         continue;
9730                                 }
9731                                 if (data_auth_reqd && (auth == NULL)) {
9732                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9733                                 } else
9734                                         dmtu = 0;
9735                                 if (fwd->send_size <= (mtu - dmtu)) {
9736                                         if (data_auth_reqd) {
9737                                                 if (auth == NULL) {
9738                                                         m = sctp_add_auth_chunk(m,
9739                                                             &endofchain,
9740                                                             &auth,
9741                                                             &auth_offset,
9742                                                             stcb,
9743                                                             SCTP_DATA);
9744                                                         auth_keyid = fwd->auth_keyid;
9745                                                         override_ok = 0;
9746                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9747                                                 } else if (override_ok) {
9748                                                         auth_keyid = fwd->auth_keyid;
9749                                                         override_ok = 0;
9750                                                 } else if (fwd->auth_keyid != auth_keyid) {
9751                                                         /*
9752                                                          * different keyid,
9753                                                          * so done bundling
9754                                                          */
9755                                                         break;
9756                                                 }
9757                                         }
9758                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9759                                         if (m == NULL) {
9760                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9761                                                 return (ENOMEM);
9762                                         }
9763                                         /* Do clear IP_DF ? */
9764                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9765                                                 no_fragmentflg = 0;
9766                                         }
9767                                         /* upate our MTU size */
9768                                         if (mtu > (fwd->send_size + dmtu))
9769                                                 mtu -= (fwd->send_size + dmtu);
9770                                         else
9771                                                 mtu = 0;
9772                                         data_list[bundle_at++] = fwd;
9773                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9774                                                 break;
9775                                         }
9776                                 } else {
9777                                         /* can't fit so we are done */
9778                                         break;
9779                                 }
9780                         }
9781                 }
9782                 /* Is there something to send for this destination? */
9783                 if (m) {
9784                         /*
9785                          * No matter if we fail/or succeed we should start a
9786                          * timer. A failure is like a lost IP packet :-)
9787                          */
9788                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9789                                 /*
9790                                  * no timer running on this destination
9791                                  * restart it.
9792                                  */
9793                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9794                                 tmr_started = 1;
9795                         }
9796                         /* Now lets send it, if there is anything to send :> */
9797                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9798                             (struct sockaddr *)&net->ro._l_addr, m,
9799                             auth_offset, auth, auth_keyid,
9800                             no_fragmentflg, 0, 0,
9801                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9802                             net->port, NULL,
9803                             0, 0,
9804                             so_locked))) {
9805                                 /* error, we could not output */
9806                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9807                                 if (error == ENOBUFS) {
9808                                         asoc->ifp_had_enobuf = 1;
9809                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9810                                 }
9811                                 return (error);
9812                         } else {
9813                                 asoc->ifp_had_enobuf = 0;
9814                         }
9815                         endofchain = NULL;
9816                         auth = NULL;
9817                         auth_offset = 0;
9818                         /* For HB's */
9819                         /*
9820                          * We don't want to mark the net->sent time here
9821                          * since this we use this for HB and retrans cannot
9822                          * measure RTT
9823                          */
9824                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9825
9826                         /* For auto-close */
9827                         cnt_thru++;
9828                         if (*now_filled == 0) {
9829                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9830                                 *now = asoc->time_last_sent;
9831                                 *now_filled = 1;
9832                         } else {
9833                                 asoc->time_last_sent = *now;
9834                         }
9835                         *cnt_out += bundle_at;
9836 #ifdef SCTP_AUDITING_ENABLED
9837                         sctp_audit_log(0xC4, bundle_at);
9838 #endif
9839                         if (bundle_at) {
9840                                 tsns_sent = data_list[0]->rec.data.tsn;
9841                         }
9842                         for (i = 0; i < bundle_at; i++) {
9843                                 SCTP_STAT_INCR(sctps_sendretransdata);
9844                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9845                                 /*
9846                                  * When we have a revoked data, and we
9847                                  * retransmit it, then we clear the revoked
9848                                  * flag since this flag dictates if we
9849                                  * subtracted from the fs
9850                                  */
9851                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9852                                         /* Deflate the cwnd */
9853                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9854                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9855                                 }
9856                                 data_list[i]->snd_count++;
9857                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9858                                 /* record the time */
9859                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9860                                 if (data_list[i]->book_size_scale) {
9861                                         /*
9862                                          * need to double the book size on
9863                                          * this one
9864                                          */
9865                                         data_list[i]->book_size_scale = 0;
9866                                         /*
9867                                          * Since we double the booksize, we
9868                                          * must also double the output queue
9869                                          * size, since this get shrunk when
9870                                          * we free by this amount.
9871                                          */
9872                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9873                                         data_list[i]->book_size *= 2;
9874
9875
9876                                 } else {
9877                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9878                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9879                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9880                                         }
9881                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9882                                             (uint32_t)(data_list[i]->send_size +
9883                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9884                                 }
9885                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9886                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9887                                             data_list[i]->whoTo->flight_size,
9888                                             data_list[i]->book_size,
9889                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9890                                             data_list[i]->rec.data.tsn);
9891                                 }
9892                                 sctp_flight_size_increase(data_list[i]);
9893                                 sctp_total_flight_increase(stcb, data_list[i]);
9894                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9895                                         /* SWS sender side engages */
9896                                         asoc->peers_rwnd = 0;
9897                                 }
9898                                 if ((i == 0) &&
9899                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9900                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9901                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9902                                             (tmr_started == 0)) {
9903                                                 /*-
9904                                                  * ok we just fast-retrans'd
9905                                                  * the lowest TSN, i.e the
9906                                                  * first on the list. In
9907                                                  * this case we want to give
9908                                                  * some more time to get a
9909                                                  * SACK back without a
9910                                                  * t3-expiring.
9911                                                  */
9912                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9913                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9914                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9915                                         }
9916                                 }
9917                         }
9918                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9919                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9920                         }
9921 #ifdef SCTP_AUDITING_ENABLED
9922                         sctp_auditing(21, inp, stcb, NULL);
9923 #endif
9924                 } else {
9925                         /* None will fit */
9926                         return (1);
9927                 }
9928                 if (asoc->sent_queue_retran_cnt <= 0) {
9929                         /* all done we have no more to retran */
9930                         asoc->sent_queue_retran_cnt = 0;
9931                         break;
9932                 }
9933                 if (one_chunk) {
9934                         /* No more room in rwnd */
9935                         return (1);
9936                 }
9937                 /* stop the for loop here. we sent out a packet */
9938                 break;
9939         }
9940         return (0);
9941 }
9942
9943 static void
9944 sctp_timer_validation(struct sctp_inpcb *inp,
9945     struct sctp_tcb *stcb,
9946     struct sctp_association *asoc)
9947 {
9948         struct sctp_nets *net;
9949
9950         /* Validate that a timer is running somewhere */
9951         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9952                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9953                         /* Here is a timer */
9954                         return;
9955                 }
9956         }
9957         SCTP_TCB_LOCK_ASSERT(stcb);
9958         /* Gak, we did not have a timer somewhere */
9959         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9960         if (asoc->alternate) {
9961                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9962         } else {
9963                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9964         }
9965         return;
9966 }
9967
9968 void
9969 sctp_chunk_output(struct sctp_inpcb *inp,
9970     struct sctp_tcb *stcb,
9971     int from_where,
9972     int so_locked
9973 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9974     SCTP_UNUSED
9975 #endif
9976 )
9977 {
9978         /*-
9979          * Ok this is the generic chunk service queue. we must do the
9980          * following:
9981          * - See if there are retransmits pending, if so we must
9982          *   do these first.
9983          * - Service the stream queue that is next, moving any
9984          *   message (note I must get a complete message i.e.
9985          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9986          *   TSN's
9987          * - Check to see if the cwnd/rwnd allows any output, if so we
9988          *   go ahead and fomulate and send the low level chunks. Making sure
9989          *   to combine any control in the control chunk queue also.
9990          */
9991         struct sctp_association *asoc;
9992         struct sctp_nets *net;
9993         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9994         unsigned int burst_cnt = 0;
9995         struct timeval now;
9996         int now_filled = 0;
9997         int nagle_on;
9998         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9999         int un_sent = 0;
10000         int fr_done;
10001         unsigned int tot_frs = 0;
10002
10003         asoc = &stcb->asoc;
10004 do_it_again:
10005         /* The Nagle algorithm is only applied when handling a send call. */
10006         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10007                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10008                         nagle_on = 0;
10009                 } else {
10010                         nagle_on = 1;
10011                 }
10012         } else {
10013                 nagle_on = 0;
10014         }
10015         SCTP_TCB_LOCK_ASSERT(stcb);
10016
10017         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10018
10019         if ((un_sent <= 0) &&
10020             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10021             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10022             (asoc->sent_queue_retran_cnt == 0) &&
10023             (asoc->trigger_reset == 0)) {
10024                 /* Nothing to do unless there is something to be sent left */
10025                 return;
10026         }
10027         /*
10028          * Do we have something to send, data or control AND a sack timer
10029          * running, if so piggy-back the sack.
10030          */
10031         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10032                 sctp_send_sack(stcb, so_locked);
10033                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10034         }
10035         while (asoc->sent_queue_retran_cnt) {
10036                 /*-
10037                  * Ok, it is retransmission time only, we send out only ONE
10038                  * packet with a single call off to the retran code.
10039                  */
10040                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10041                         /*-
10042                          * Special hook for handling cookiess discarded
10043                          * by peer that carried data. Send cookie-ack only
10044                          * and then the next call with get the retran's.
10045                          */
10046                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10047                             from_where,
10048                             &now, &now_filled, frag_point, so_locked);
10049                         return;
10050                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10051                         /* if its not from a HB then do it */
10052                         fr_done = 0;
10053                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10054                         if (fr_done) {
10055                                 tot_frs++;
10056                         }
10057                 } else {
10058                         /*
10059                          * its from any other place, we don't allow retran
10060                          * output (only control)
10061                          */
10062                         ret = 1;
10063                 }
10064                 if (ret > 0) {
10065                         /* Can't send anymore */
10066                         /*-
10067                          * now lets push out control by calling med-level
10068                          * output once. this assures that we WILL send HB's
10069                          * if queued too.
10070                          */
10071                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10072                             from_where,
10073                             &now, &now_filled, frag_point, so_locked);
10074 #ifdef SCTP_AUDITING_ENABLED
10075                         sctp_auditing(8, inp, stcb, NULL);
10076 #endif
10077                         sctp_timer_validation(inp, stcb, asoc);
10078                         return;
10079                 }
10080                 if (ret < 0) {
10081                         /*-
10082                          * The count was off.. retran is not happening so do
10083                          * the normal retransmission.
10084                          */
10085 #ifdef SCTP_AUDITING_ENABLED
10086                         sctp_auditing(9, inp, stcb, NULL);
10087 #endif
10088                         if (ret == SCTP_RETRAN_EXIT) {
10089                                 return;
10090                         }
10091                         break;
10092                 }
10093                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10094                         /* Only one transmission allowed out of a timeout */
10095 #ifdef SCTP_AUDITING_ENABLED
10096                         sctp_auditing(10, inp, stcb, NULL);
10097 #endif
10098                         /* Push out any control */
10099                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10100                             &now, &now_filled, frag_point, so_locked);
10101                         return;
10102                 }
10103                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10104                         /* Hit FR burst limit */
10105                         return;
10106                 }
10107                 if ((num_out == 0) && (ret == 0)) {
10108                         /* No more retrans to send */
10109                         break;
10110                 }
10111         }
10112 #ifdef SCTP_AUDITING_ENABLED
10113         sctp_auditing(12, inp, stcb, NULL);
10114 #endif
10115         /* Check for bad destinations, if they exist move chunks around. */
10116         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10117                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10118                         /*-
10119                          * if possible move things off of this address we
10120                          * still may send below due to the dormant state but
10121                          * we try to find an alternate address to send to
10122                          * and if we have one we move all queued data on the
10123                          * out wheel to this alternate address.
10124                          */
10125                         if (net->ref_count > 1)
10126                                 sctp_move_chunks_from_net(stcb, net);
10127                 } else {
10128                         /*-
10129                          * if ((asoc->sat_network) || (net->addr_is_local))
10130                          * { burst_limit = asoc->max_burst *
10131                          * SCTP_SAT_NETWORK_BURST_INCR; }
10132                          */
10133                         if (asoc->max_burst > 0) {
10134                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10135                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10136                                                 /*
10137                                                  * JRS - Use the congestion
10138                                                  * control given in the
10139                                                  * congestion control module
10140                                                  */
10141                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10142                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10143                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10144                                                 }
10145                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10146                                         }
10147                                         net->fast_retran_ip = 0;
10148                                 } else {
10149                                         if (net->flight_size == 0) {
10150                                                 /*
10151                                                  * Should be decaying the
10152                                                  * cwnd here
10153                                                  */
10154                                                 ;
10155                                         }
10156                                 }
10157                         }
10158                 }
10159
10160         }
10161         burst_cnt = 0;
10162         do {
10163                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10164                     &reason_code, 0, from_where,
10165                     &now, &now_filled, frag_point, so_locked);
10166                 if (error) {
10167                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10168                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10169                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10170                         }
10171                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10172                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10173                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10174                         }
10175                         break;
10176                 }
10177                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10178
10179                 tot_out += num_out;
10180                 burst_cnt++;
10181                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10182                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10183                         if (num_out == 0) {
10184                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10185                         }
10186                 }
10187                 if (nagle_on) {
10188                         /*
10189                          * When the Nagle algorithm is used, look at how
10190                          * much is unsent, then if its smaller than an MTU
10191                          * and we have data in flight we stop, except if we
10192                          * are handling a fragmented user message.
10193                          */
10194                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10195                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10196                             (stcb->asoc.total_flight > 0)) {
10197 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10198                                 break;
10199                         }
10200                 }
10201                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10202                     TAILQ_EMPTY(&asoc->send_queue) &&
10203                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10204                         /* Nothing left to send */
10205                         break;
10206                 }
10207                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10208                         /* Nothing left to send */
10209                         break;
10210                 }
10211         } while (num_out &&
10212             ((asoc->max_burst == 0) ||
10213             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10214             (burst_cnt < asoc->max_burst)));
10215
10216         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10217                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10218                         SCTP_STAT_INCR(sctps_maxburstqueued);
10219                         asoc->burst_limit_applied = 1;
10220                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10221                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10222                         }
10223                 } else {
10224                         asoc->burst_limit_applied = 0;
10225                 }
10226         }
10227         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10228                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10229         }
10230         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10231             tot_out);
10232
10233         /*-
10234          * Now we need to clean up the control chunk chain if a ECNE is on
10235          * it. It must be marked as UNSENT again so next call will continue
10236          * to send it until such time that we get a CWR, to remove it.
10237          */
10238         if (stcb->asoc.ecn_echo_cnt_onq)
10239                 sctp_fix_ecn_echo(asoc);
10240
10241         if (stcb->asoc.trigger_reset) {
10242                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10243                         goto do_it_again;
10244                 }
10245         }
10246         return;
10247 }
10248
10249
10250 int
10251 sctp_output(
10252     struct sctp_inpcb *inp,
10253     struct mbuf *m,
10254     struct sockaddr *addr,
10255     struct mbuf *control,
10256     struct thread *p,
10257     int flags)
10258 {
10259         if (inp == NULL) {
10260                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10261                 return (EINVAL);
10262         }
10263
10264         if (inp->sctp_socket == NULL) {
10265                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10266                 return (EINVAL);
10267         }
10268         return (sctp_sosend(inp->sctp_socket,
10269             addr,
10270             (struct uio *)NULL,
10271             m,
10272             control,
10273             flags, p
10274             ));
10275 }
10276
10277 void
10278 send_forward_tsn(struct sctp_tcb *stcb,
10279     struct sctp_association *asoc)
10280 {
10281         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10282         struct sctp_forward_tsn_chunk *fwdtsn;
10283         struct sctp_strseq *strseq;
10284         struct sctp_strseq_mid *strseq_m;
10285         uint32_t advance_peer_ack_point;
10286         unsigned int cnt_of_space, i, ovh;
10287         unsigned int space_needed;
10288         unsigned int cnt_of_skipped = 0;
10289
10290         SCTP_TCB_LOCK_ASSERT(stcb);
10291         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10292                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10293                         /* mark it to unsent */
10294                         chk->sent = SCTP_DATAGRAM_UNSENT;
10295                         chk->snd_count = 0;
10296                         /* Do we correct its output location? */
10297                         if (chk->whoTo) {
10298                                 sctp_free_remote_addr(chk->whoTo);
10299                                 chk->whoTo = NULL;
10300                         }
10301                         goto sctp_fill_in_rest;
10302                 }
10303         }
10304         /* Ok if we reach here we must build one */
10305         sctp_alloc_a_chunk(stcb, chk);
10306         if (chk == NULL) {
10307                 return;
10308         }
10309         asoc->fwd_tsn_cnt++;
10310         chk->copy_by_ref = 0;
10311         /*
10312          * We don't do the old thing here since this is used not for on-wire
10313          * but to tell if we are sending a fwd-tsn by the stack during
10314          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10315          */
10316         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10317         chk->rec.chunk_id.can_take_data = 0;
10318         chk->flags = 0;
10319         chk->asoc = asoc;
10320         chk->whoTo = NULL;
10321         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10322         if (chk->data == NULL) {
10323                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10324                 return;
10325         }
10326         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10327         chk->sent = SCTP_DATAGRAM_UNSENT;
10328         chk->snd_count = 0;
10329         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10330         asoc->ctrl_queue_cnt++;
10331 sctp_fill_in_rest:
10332         /*-
10333          * Here we go through and fill out the part that deals with
10334          * stream/seq of the ones we skip.
10335          */
10336         SCTP_BUF_LEN(chk->data) = 0;
10337         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10338                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10339                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10340                         /* no more to look at */
10341                         break;
10342                 }
10343                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10344                         /* We don't report these */
10345                         continue;
10346                 }
10347                 cnt_of_skipped++;
10348         }
10349         if (asoc->idata_supported) {
10350                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10351                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10352         } else {
10353                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10354                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10355         }
10356         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10357
10358         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10359                 ovh = SCTP_MIN_OVERHEAD;
10360         } else {
10361                 ovh = SCTP_MIN_V4_OVERHEAD;
10362         }
10363         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10364                 /* trim to a mtu size */
10365                 cnt_of_space = asoc->smallest_mtu - ovh;
10366         }
10367         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10368                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10369                     0xff, 0, cnt_of_skipped,
10370                     asoc->advanced_peer_ack_point);
10371         }
10372         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10373         if (cnt_of_space < space_needed) {
10374                 /*-
10375                  * ok we must trim down the chunk by lowering the
10376                  * advance peer ack point.
10377                  */
10378                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10379                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10380                             0xff, 0xff, cnt_of_space,
10381                             space_needed);
10382                 }
10383                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10384                 if (asoc->idata_supported) {
10385                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10386                 } else {
10387                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10388                 }
10389                 /*-
10390                  * Go through and find the TSN that will be the one
10391                  * we report.
10392                  */
10393                 at = TAILQ_FIRST(&asoc->sent_queue);
10394                 if (at != NULL) {
10395                         for (i = 0; i < cnt_of_skipped; i++) {
10396                                 tp1 = TAILQ_NEXT(at, sctp_next);
10397                                 if (tp1 == NULL) {
10398                                         break;
10399                                 }
10400                                 at = tp1;
10401                         }
10402                 }
10403                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10404                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10405                             0xff, cnt_of_skipped, at->rec.data.tsn,
10406                             asoc->advanced_peer_ack_point);
10407                 }
10408                 last = at;
10409                 /*-
10410                  * last now points to last one I can report, update
10411                  * peer ack point
10412                  */
10413                 if (last) {
10414                         advance_peer_ack_point = last->rec.data.tsn;
10415                 }
10416                 if (asoc->idata_supported) {
10417                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10418                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10419                 } else {
10420                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10421                             cnt_of_skipped * sizeof(struct sctp_strseq);
10422                 }
10423         }
10424         chk->send_size = space_needed;
10425         /* Setup the chunk */
10426         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10427         fwdtsn->ch.chunk_length = htons(chk->send_size);
10428         fwdtsn->ch.chunk_flags = 0;
10429         if (asoc->idata_supported) {
10430                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10431         } else {
10432                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10433         }
10434         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10435         SCTP_BUF_LEN(chk->data) = chk->send_size;
10436         fwdtsn++;
10437         /*-
10438          * Move pointer to after the fwdtsn and transfer to the
10439          * strseq pointer.
10440          */
10441         if (asoc->idata_supported) {
10442                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10443                 strseq = NULL;
10444         } else {
10445                 strseq = (struct sctp_strseq *)fwdtsn;
10446                 strseq_m = NULL;
10447         }
10448         /*-
10449          * Now populate the strseq list. This is done blindly
10450          * without pulling out duplicate stream info. This is
10451          * inefficent but won't harm the process since the peer will
10452          * look at these in sequence and will thus release anything.
10453          * It could mean we exceed the PMTU and chop off some that
10454          * we could have included.. but this is unlikely (aka 1432/4
10455          * would mean 300+ stream seq's would have to be reported in
10456          * one FWD-TSN. With a bit of work we can later FIX this to
10457          * optimize and pull out duplicates.. but it does add more
10458          * overhead. So for now... not!
10459          */
10460         i = 0;
10461         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10462                 if (i >= cnt_of_skipped) {
10463                         break;
10464                 }
10465                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10466                         /* We don't report these */
10467                         continue;
10468                 }
10469                 if (at->rec.data.tsn == advance_peer_ack_point) {
10470                         at->rec.data.fwd_tsn_cnt = 0;
10471                 }
10472                 if (asoc->idata_supported) {
10473                         strseq_m->sid = htons(at->rec.data.sid);
10474                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10475                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10476                         } else {
10477                                 strseq_m->flags = 0;
10478                         }
10479                         strseq_m->mid = htonl(at->rec.data.mid);
10480                         strseq_m++;
10481                 } else {
10482                         strseq->sid = htons(at->rec.data.sid);
10483                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10484                         strseq++;
10485                 }
10486                 i++;
10487         }
10488         return;
10489 }
10490
10491 void
10492 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10493 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10494     SCTP_UNUSED
10495 #endif
10496 )
10497 {
10498         /*-
10499          * Queue up a SACK or NR-SACK in the control queue.
10500          * We must first check to see if a SACK or NR-SACK is
10501          * somehow on the control queue.
10502          * If so, we will take and and remove the old one.
10503          */
10504         struct sctp_association *asoc;
10505         struct sctp_tmit_chunk *chk, *a_chk;
10506         struct sctp_sack_chunk *sack;
10507         struct sctp_nr_sack_chunk *nr_sack;
10508         struct sctp_gap_ack_block *gap_descriptor;
10509         const struct sack_track *selector;
10510         int mergeable = 0;
10511         int offset;
10512         caddr_t limit;
10513         uint32_t *dup;
10514         int limit_reached = 0;
10515         unsigned int i, siz, j;
10516         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10517         int num_dups = 0;
10518         int space_req;
10519         uint32_t highest_tsn;
10520         uint8_t flags;
10521         uint8_t type;
10522         uint8_t tsn_map;
10523
10524         if (stcb->asoc.nrsack_supported == 1) {
10525                 type = SCTP_NR_SELECTIVE_ACK;
10526         } else {
10527                 type = SCTP_SELECTIVE_ACK;
10528         }
10529         a_chk = NULL;
10530         asoc = &stcb->asoc;
10531         SCTP_TCB_LOCK_ASSERT(stcb);
10532         if (asoc->last_data_chunk_from == NULL) {
10533                 /* Hmm we never received anything */
10534                 return;
10535         }
10536         sctp_slide_mapping_arrays(stcb);
10537         sctp_set_rwnd(stcb, asoc);
10538         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10539                 if (chk->rec.chunk_id.id == type) {
10540                         /* Hmm, found a sack already on queue, remove it */
10541                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10542                         asoc->ctrl_queue_cnt--;
10543                         a_chk = chk;
10544                         if (a_chk->data) {
10545                                 sctp_m_freem(a_chk->data);
10546                                 a_chk->data = NULL;
10547                         }
10548                         if (a_chk->whoTo) {
10549                                 sctp_free_remote_addr(a_chk->whoTo);
10550                                 a_chk->whoTo = NULL;
10551                         }
10552                         break;
10553                 }
10554         }
10555         if (a_chk == NULL) {
10556                 sctp_alloc_a_chunk(stcb, a_chk);
10557                 if (a_chk == NULL) {
10558                         /* No memory so we drop the idea, and set a timer */
10559                         if (stcb->asoc.delayed_ack) {
10560                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10561                                     stcb->sctp_ep, stcb, NULL,
10562                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10563                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10564                                     stcb->sctp_ep, stcb, NULL);
10565                         } else {
10566                                 stcb->asoc.send_sack = 1;
10567                         }
10568                         return;
10569                 }
10570                 a_chk->copy_by_ref = 0;
10571                 a_chk->rec.chunk_id.id = type;
10572                 a_chk->rec.chunk_id.can_take_data = 1;
10573         }
10574         /* Clear our pkt counts */
10575         asoc->data_pkts_seen = 0;
10576
10577         a_chk->flags = 0;
10578         a_chk->asoc = asoc;
10579         a_chk->snd_count = 0;
10580         a_chk->send_size = 0;   /* fill in later */
10581         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10582         a_chk->whoTo = NULL;
10583
10584         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10585                 /*-
10586                  * Ok, the destination for the SACK is unreachable, lets see if
10587                  * we can select an alternate to asoc->last_data_chunk_from
10588                  */
10589                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10590                 if (a_chk->whoTo == NULL) {
10591                         /* Nope, no alternate */
10592                         a_chk->whoTo = asoc->last_data_chunk_from;
10593                 }
10594         } else {
10595                 a_chk->whoTo = asoc->last_data_chunk_from;
10596         }
10597         if (a_chk->whoTo) {
10598                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10599         }
10600         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10601                 highest_tsn = asoc->highest_tsn_inside_map;
10602         } else {
10603                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10604         }
10605         if (highest_tsn == asoc->cumulative_tsn) {
10606                 /* no gaps */
10607                 if (type == SCTP_SELECTIVE_ACK) {
10608                         space_req = sizeof(struct sctp_sack_chunk);
10609                 } else {
10610                         space_req = sizeof(struct sctp_nr_sack_chunk);
10611                 }
10612         } else {
10613                 /* gaps get a cluster */
10614                 space_req = MCLBYTES;
10615         }
10616         /* Ok now lets formulate a MBUF with our sack */
10617         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10618         if ((a_chk->data == NULL) ||
10619             (a_chk->whoTo == NULL)) {
10620                 /* rats, no mbuf memory */
10621                 if (a_chk->data) {
10622                         /* was a problem with the destination */
10623                         sctp_m_freem(a_chk->data);
10624                         a_chk->data = NULL;
10625                 }
10626                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10627                 /* sa_ignore NO_NULL_CHK */
10628                 if (stcb->asoc.delayed_ack) {
10629                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10630                             stcb->sctp_ep, stcb, NULL,
10631                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10632                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10633                             stcb->sctp_ep, stcb, NULL);
10634                 } else {
10635                         stcb->asoc.send_sack = 1;
10636                 }
10637                 return;
10638         }
10639         /* ok, lets go through and fill it in */
10640         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10641         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10642         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10643                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10644         }
10645         limit = mtod(a_chk->data, caddr_t);
10646         limit += space;
10647
10648         flags = 0;
10649
10650         if ((asoc->sctp_cmt_on_off > 0) &&
10651             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10652                 /*-
10653                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10654                  * received, then set high bit to 1, else 0. Reset
10655                  * pkts_rcvd.
10656                  */
10657                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10658                 asoc->cmt_dac_pkts_rcvd = 0;
10659         }
10660 #ifdef SCTP_ASOCLOG_OF_TSNS
10661         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10662         stcb->asoc.cumack_log_atsnt++;
10663         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10664                 stcb->asoc.cumack_log_atsnt = 0;
10665         }
10666 #endif
10667         /* reset the readers interpretation */
10668         stcb->freed_by_sorcv_sincelast = 0;
10669
10670         if (type == SCTP_SELECTIVE_ACK) {
10671                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10672                 nr_sack = NULL;
10673                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10674                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10675                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10676                 } else {
10677                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10678                 }
10679         } else {
10680                 sack = NULL;
10681                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10682                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10683                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10684                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10685                 } else {
10686                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10687                 }
10688         }
10689
10690         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10691                 offset = 1;
10692         } else {
10693                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10694         }
10695         if (((type == SCTP_SELECTIVE_ACK) &&
10696             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10697             ((type == SCTP_NR_SELECTIVE_ACK) &&
10698             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10699                 /* we have a gap .. maybe */
10700                 for (i = 0; i < siz; i++) {
10701                         tsn_map = asoc->mapping_array[i];
10702                         if (type == SCTP_SELECTIVE_ACK) {
10703                                 tsn_map |= asoc->nr_mapping_array[i];
10704                         }
10705                         if (i == 0) {
10706                                 /*
10707                                  * Clear all bits corresponding to TSNs
10708                                  * smaller or equal to the cumulative TSN.
10709                                  */
10710                                 tsn_map &= (~0U << (1 - offset));
10711                         }
10712                         selector = &sack_array[tsn_map];
10713                         if (mergeable && selector->right_edge) {
10714                                 /*
10715                                  * Backup, left and right edges were ok to
10716                                  * merge.
10717                                  */
10718                                 num_gap_blocks--;
10719                                 gap_descriptor--;
10720                         }
10721                         if (selector->num_entries == 0)
10722                                 mergeable = 0;
10723                         else {
10724                                 for (j = 0; j < selector->num_entries; j++) {
10725                                         if (mergeable && selector->right_edge) {
10726                                                 /*
10727                                                  * do a merge by NOT setting
10728                                                  * the left side
10729                                                  */
10730                                                 mergeable = 0;
10731                                         } else {
10732                                                 /*
10733                                                  * no merge, set the left
10734                                                  * side
10735                                                  */
10736                                                 mergeable = 0;
10737                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10738                                         }
10739                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10740                                         num_gap_blocks++;
10741                                         gap_descriptor++;
10742                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10743                                                 /* no more room */
10744                                                 limit_reached = 1;
10745                                                 break;
10746                                         }
10747                                 }
10748                                 if (selector->left_edge) {
10749                                         mergeable = 1;
10750                                 }
10751                         }
10752                         if (limit_reached) {
10753                                 /* Reached the limit stop */
10754                                 break;
10755                         }
10756                         offset += 8;
10757                 }
10758         }
10759         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10760             (limit_reached == 0)) {
10761
10762                 mergeable = 0;
10763
10764                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10765                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10766                 } else {
10767                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10768                 }
10769
10770                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10771                         offset = 1;
10772                 } else {
10773                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10774                 }
10775                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10776                         /* we have a gap .. maybe */
10777                         for (i = 0; i < siz; i++) {
10778                                 tsn_map = asoc->nr_mapping_array[i];
10779                                 if (i == 0) {
10780                                         /*
10781                                          * Clear all bits corresponding to
10782                                          * TSNs smaller or equal to the
10783                                          * cumulative TSN.
10784                                          */
10785                                         tsn_map &= (~0U << (1 - offset));
10786                                 }
10787                                 selector = &sack_array[tsn_map];
10788                                 if (mergeable && selector->right_edge) {
10789                                         /*
10790                                          * Backup, left and right edges were
10791                                          * ok to merge.
10792                                          */
10793                                         num_nr_gap_blocks--;
10794                                         gap_descriptor--;
10795                                 }
10796                                 if (selector->num_entries == 0)
10797                                         mergeable = 0;
10798                                 else {
10799                                         for (j = 0; j < selector->num_entries; j++) {
10800                                                 if (mergeable && selector->right_edge) {
10801                                                         /*
10802                                                          * do a merge by NOT
10803                                                          * setting the left
10804                                                          * side
10805                                                          */
10806                                                         mergeable = 0;
10807                                                 } else {
10808                                                         /*
10809                                                          * no merge, set the
10810                                                          * left side
10811                                                          */
10812                                                         mergeable = 0;
10813                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10814                                                 }
10815                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10816                                                 num_nr_gap_blocks++;
10817                                                 gap_descriptor++;
10818                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10819                                                         /* no more room */
10820                                                         limit_reached = 1;
10821                                                         break;
10822                                                 }
10823                                         }
10824                                         if (selector->left_edge) {
10825                                                 mergeable = 1;
10826                                         }
10827                                 }
10828                                 if (limit_reached) {
10829                                         /* Reached the limit stop */
10830                                         break;
10831                                 }
10832                                 offset += 8;
10833                         }
10834                 }
10835         }
10836         /* now we must add any dups we are going to report. */
10837         if ((limit_reached == 0) && (asoc->numduptsns)) {
10838                 dup = (uint32_t *)gap_descriptor;
10839                 for (i = 0; i < asoc->numduptsns; i++) {
10840                         *dup = htonl(asoc->dup_tsns[i]);
10841                         dup++;
10842                         num_dups++;
10843                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10844                                 /* no more room */
10845                                 break;
10846                         }
10847                 }
10848                 asoc->numduptsns = 0;
10849         }
10850         /*
10851          * now that the chunk is prepared queue it to the control chunk
10852          * queue.
10853          */
10854         if (type == SCTP_SELECTIVE_ACK) {
10855                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10856                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10857                     num_dups * sizeof(int32_t));
10858                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10859                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10860                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10861                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10862                 sack->sack.num_dup_tsns = htons(num_dups);
10863                 sack->ch.chunk_type = type;
10864                 sack->ch.chunk_flags = flags;
10865                 sack->ch.chunk_length = htons(a_chk->send_size);
10866         } else {
10867                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10868                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10869                     num_dups * sizeof(int32_t));
10870                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10871                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10872                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10873                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10874                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10875                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10876                 nr_sack->nr_sack.reserved = 0;
10877                 nr_sack->ch.chunk_type = type;
10878                 nr_sack->ch.chunk_flags = flags;
10879                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10880         }
10881         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10882         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10883         asoc->ctrl_queue_cnt++;
10884         asoc->send_sack = 0;
10885         SCTP_STAT_INCR(sctps_sendsacks);
10886         return;
10887 }
10888
10889 void
10890 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10891 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10892     SCTP_UNUSED
10893 #endif
10894 )
10895 {
10896         struct mbuf *m_abort, *m, *m_last;
10897         struct mbuf *m_out, *m_end = NULL;
10898         struct sctp_abort_chunk *abort;
10899         struct sctp_auth_chunk *auth = NULL;
10900         struct sctp_nets *net;
10901         uint32_t vtag;
10902         uint32_t auth_offset = 0;
10903         int error;
10904         uint16_t cause_len, chunk_len, padding_len;
10905
10906         SCTP_TCB_LOCK_ASSERT(stcb);
10907         /*-
10908          * Add an AUTH chunk, if chunk requires it and save the offset into
10909          * the chain for AUTH
10910          */
10911         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10912             stcb->asoc.peer_auth_chunks)) {
10913                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10914                     stcb, SCTP_ABORT_ASSOCIATION);
10915                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10916         } else {
10917                 m_out = NULL;
10918         }
10919         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10920         if (m_abort == NULL) {
10921                 if (m_out) {
10922                         sctp_m_freem(m_out);
10923                 }
10924                 if (operr) {
10925                         sctp_m_freem(operr);
10926                 }
10927                 return;
10928         }
10929         /* link in any error */
10930         SCTP_BUF_NEXT(m_abort) = operr;
10931         cause_len = 0;
10932         m_last = NULL;
10933         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10934                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10935                 if (SCTP_BUF_NEXT(m) == NULL) {
10936                         m_last = m;
10937                 }
10938         }
10939         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10940         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10941         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10942         if (m_out == NULL) {
10943                 /* NO Auth chunk prepended, so reserve space in front */
10944                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10945                 m_out = m_abort;
10946         } else {
10947                 /* Put AUTH chunk at the front of the chain */
10948                 SCTP_BUF_NEXT(m_end) = m_abort;
10949         }
10950         if (stcb->asoc.alternate) {
10951                 net = stcb->asoc.alternate;
10952         } else {
10953                 net = stcb->asoc.primary_destination;
10954         }
10955         /* Fill in the ABORT chunk header. */
10956         abort = mtod(m_abort, struct sctp_abort_chunk *);
10957         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10958         if (stcb->asoc.peer_vtag == 0) {
10959                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10960                 vtag = stcb->asoc.my_vtag;
10961                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10962         } else {
10963                 vtag = stcb->asoc.peer_vtag;
10964                 abort->ch.chunk_flags = 0;
10965         }
10966         abort->ch.chunk_length = htons(chunk_len);
10967         /* Add padding, if necessary. */
10968         if (padding_len > 0) {
10969                 if ((m_last == NULL) ||
10970                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10971                         sctp_m_freem(m_out);
10972                         return;
10973                 }
10974         }
10975         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10976             (struct sockaddr *)&net->ro._l_addr,
10977             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10978             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10979             stcb->asoc.primary_destination->port, NULL,
10980             0, 0,
10981             so_locked))) {
10982                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10983                 if (error == ENOBUFS) {
10984                         stcb->asoc.ifp_had_enobuf = 1;
10985                         SCTP_STAT_INCR(sctps_lowlevelerr);
10986                 }
10987         } else {
10988                 stcb->asoc.ifp_had_enobuf = 0;
10989         }
10990         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10991 }
10992
10993 void
10994 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10995     struct sctp_nets *net,
10996     int reflect_vtag)
10997 {
10998         /* formulate and SEND a SHUTDOWN-COMPLETE */
10999         struct mbuf *m_shutdown_comp;
11000         struct sctp_shutdown_complete_chunk *shutdown_complete;
11001         uint32_t vtag;
11002         int error;
11003         uint8_t flags;
11004
11005         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11006         if (m_shutdown_comp == NULL) {
11007                 /* no mbuf's */
11008                 return;
11009         }
11010         if (reflect_vtag) {
11011                 flags = SCTP_HAD_NO_TCB;
11012                 vtag = stcb->asoc.my_vtag;
11013         } else {
11014                 flags = 0;
11015                 vtag = stcb->asoc.peer_vtag;
11016         }
11017         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11018         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11019         shutdown_complete->ch.chunk_flags = flags;
11020         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11021         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11022         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11023             (struct sockaddr *)&net->ro._l_addr,
11024             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11025             stcb->sctp_ep->sctp_lport, stcb->rport,
11026             htonl(vtag),
11027             net->port, NULL,
11028             0, 0,
11029             SCTP_SO_NOT_LOCKED))) {
11030                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11031                 if (error == ENOBUFS) {
11032                         stcb->asoc.ifp_had_enobuf = 1;
11033                         SCTP_STAT_INCR(sctps_lowlevelerr);
11034                 }
11035         } else {
11036                 stcb->asoc.ifp_had_enobuf = 0;
11037         }
11038         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11039         return;
11040 }
11041
11042 static void
11043 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11044     struct sctphdr *sh, uint32_t vtag,
11045     uint8_t type, struct mbuf *cause,
11046     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11047     uint32_t vrf_id, uint16_t port)
11048 {
11049         struct mbuf *o_pak;
11050         struct mbuf *mout;
11051         struct sctphdr *shout;
11052         struct sctp_chunkhdr *ch;
11053 #if defined(INET) || defined(INET6)
11054         struct udphdr *udp;
11055 #endif
11056         int ret, len, cause_len, padding_len;
11057 #ifdef INET
11058         struct sockaddr_in *src_sin, *dst_sin;
11059         struct ip *ip;
11060 #endif
11061 #ifdef INET6
11062         struct sockaddr_in6 *src_sin6, *dst_sin6;
11063         struct ip6_hdr *ip6;
11064 #endif
11065
11066         /* Compute the length of the cause and add final padding. */
11067         cause_len = 0;
11068         if (cause != NULL) {
11069                 struct mbuf *m_at, *m_last = NULL;
11070
11071                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11072                         if (SCTP_BUF_NEXT(m_at) == NULL)
11073                                 m_last = m_at;
11074                         cause_len += SCTP_BUF_LEN(m_at);
11075                 }
11076                 padding_len = cause_len % 4;
11077                 if (padding_len != 0) {
11078                         padding_len = 4 - padding_len;
11079                 }
11080                 if (padding_len != 0) {
11081                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11082                                 sctp_m_freem(cause);
11083                                 return;
11084                         }
11085                 }
11086         } else {
11087                 padding_len = 0;
11088         }
11089         /* Get an mbuf for the header. */
11090         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11091         switch (dst->sa_family) {
11092 #ifdef INET
11093         case AF_INET:
11094                 len += sizeof(struct ip);
11095                 break;
11096 #endif
11097 #ifdef INET6
11098         case AF_INET6:
11099                 len += sizeof(struct ip6_hdr);
11100                 break;
11101 #endif
11102         default:
11103                 break;
11104         }
11105 #if defined(INET) || defined(INET6)
11106         if (port) {
11107                 len += sizeof(struct udphdr);
11108         }
11109 #endif
11110         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11111         if (mout == NULL) {
11112                 if (cause) {
11113                         sctp_m_freem(cause);
11114                 }
11115                 return;
11116         }
11117         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11118         SCTP_BUF_LEN(mout) = len;
11119         SCTP_BUF_NEXT(mout) = cause;
11120         M_SETFIB(mout, fibnum);
11121         mout->m_pkthdr.flowid = mflowid;
11122         M_HASHTYPE_SET(mout, mflowtype);
11123 #ifdef INET
11124         ip = NULL;
11125 #endif
11126 #ifdef INET6
11127         ip6 = NULL;
11128 #endif
11129         switch (dst->sa_family) {
11130 #ifdef INET
11131         case AF_INET:
11132                 src_sin = (struct sockaddr_in *)src;
11133                 dst_sin = (struct sockaddr_in *)dst;
11134                 ip = mtod(mout, struct ip *);
11135                 ip->ip_v = IPVERSION;
11136                 ip->ip_hl = (sizeof(struct ip) >> 2);
11137                 ip->ip_tos = 0;
11138                 ip->ip_off = htons(IP_DF);
11139                 ip_fillid(ip);
11140                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11141                 if (port) {
11142                         ip->ip_p = IPPROTO_UDP;
11143                 } else {
11144                         ip->ip_p = IPPROTO_SCTP;
11145                 }
11146                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11147                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11148                 ip->ip_sum = 0;
11149                 len = sizeof(struct ip);
11150                 shout = (struct sctphdr *)((caddr_t)ip + len);
11151                 break;
11152 #endif
11153 #ifdef INET6
11154         case AF_INET6:
11155                 src_sin6 = (struct sockaddr_in6 *)src;
11156                 dst_sin6 = (struct sockaddr_in6 *)dst;
11157                 ip6 = mtod(mout, struct ip6_hdr *);
11158                 ip6->ip6_flow = htonl(0x60000000);
11159                 if (V_ip6_auto_flowlabel) {
11160                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11161                 }
11162                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11163                 if (port) {
11164                         ip6->ip6_nxt = IPPROTO_UDP;
11165                 } else {
11166                         ip6->ip6_nxt = IPPROTO_SCTP;
11167                 }
11168                 ip6->ip6_src = dst_sin6->sin6_addr;
11169                 ip6->ip6_dst = src_sin6->sin6_addr;
11170                 len = sizeof(struct ip6_hdr);
11171                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11172                 break;
11173 #endif
11174         default:
11175                 len = 0;
11176                 shout = mtod(mout, struct sctphdr *);
11177                 break;
11178         }
11179 #if defined(INET) || defined(INET6)
11180         if (port) {
11181                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11182                         sctp_m_freem(mout);
11183                         return;
11184                 }
11185                 udp = (struct udphdr *)shout;
11186                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11187                 udp->uh_dport = port;
11188                 udp->uh_sum = 0;
11189                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11190                     sizeof(struct sctphdr) +
11191                     sizeof(struct sctp_chunkhdr) +
11192                     cause_len + padding_len));
11193                 len += sizeof(struct udphdr);
11194                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11195         } else {
11196                 udp = NULL;
11197         }
11198 #endif
11199         shout->src_port = sh->dest_port;
11200         shout->dest_port = sh->src_port;
11201         shout->checksum = 0;
11202         if (vtag) {
11203                 shout->v_tag = htonl(vtag);
11204         } else {
11205                 shout->v_tag = sh->v_tag;
11206         }
11207         len += sizeof(struct sctphdr);
11208         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11209         ch->chunk_type = type;
11210         if (vtag) {
11211                 ch->chunk_flags = 0;
11212         } else {
11213                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11214         }
11215         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11216         len += sizeof(struct sctp_chunkhdr);
11217         len += cause_len + padding_len;
11218
11219         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11220                 sctp_m_freem(mout);
11221                 return;
11222         }
11223         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11224         switch (dst->sa_family) {
11225 #ifdef INET
11226         case AF_INET:
11227                 if (port) {
11228                         if (V_udp_cksum) {
11229                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11230                         } else {
11231                                 udp->uh_sum = 0;
11232                         }
11233                 }
11234                 ip->ip_len = htons(len);
11235                 if (port) {
11236                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11237                         SCTP_STAT_INCR(sctps_sendswcrc);
11238                         if (V_udp_cksum) {
11239                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11240                         }
11241                 } else {
11242                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11243                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11244                         SCTP_STAT_INCR(sctps_sendhwcrc);
11245                 }
11246 #ifdef SCTP_PACKET_LOGGING
11247                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11248                         sctp_packet_log(o_pak);
11249                 }
11250 #endif
11251                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11252                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11253                 break;
11254 #endif
11255 #ifdef INET6
11256         case AF_INET6:
11257                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11258                 if (port) {
11259                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11260                         SCTP_STAT_INCR(sctps_sendswcrc);
11261                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11262                                 udp->uh_sum = 0xffff;
11263                         }
11264                 } else {
11265                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11266                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11267                         SCTP_STAT_INCR(sctps_sendhwcrc);
11268                 }
11269 #ifdef SCTP_PACKET_LOGGING
11270                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11271                         sctp_packet_log(o_pak);
11272                 }
11273 #endif
11274                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11275                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11276                 break;
11277 #endif
11278         default:
11279                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11280                     dst->sa_family);
11281                 sctp_m_freem(mout);
11282                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11283                 return;
11284         }
11285         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11286         if (port) {
11287                 UDPSTAT_INC(udps_opackets);
11288         }
11289         SCTP_STAT_INCR(sctps_sendpackets);
11290         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11291         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11292         if (ret) {
11293                 SCTP_STAT_INCR(sctps_senderrors);
11294         }
11295         return;
11296 }
11297
11298 void
11299 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11300     struct sctphdr *sh,
11301     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11302     uint32_t vrf_id, uint16_t port)
11303 {
11304         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11305             mflowtype, mflowid, fibnum,
11306             vrf_id, port);
11307 }
11308
11309 void
11310 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11311 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11312     SCTP_UNUSED
11313 #endif
11314 )
11315 {
11316         struct sctp_tmit_chunk *chk;
11317         struct sctp_heartbeat_chunk *hb;
11318         struct timeval now;
11319
11320         SCTP_TCB_LOCK_ASSERT(stcb);
11321         if (net == NULL) {
11322                 return;
11323         }
11324         (void)SCTP_GETTIME_TIMEVAL(&now);
11325         switch (net->ro._l_addr.sa.sa_family) {
11326 #ifdef INET
11327         case AF_INET:
11328                 break;
11329 #endif
11330 #ifdef INET6
11331         case AF_INET6:
11332                 break;
11333 #endif
11334         default:
11335                 return;
11336         }
11337         sctp_alloc_a_chunk(stcb, chk);
11338         if (chk == NULL) {
11339                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11340                 return;
11341         }
11342
11343         chk->copy_by_ref = 0;
11344         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11345         chk->rec.chunk_id.can_take_data = 1;
11346         chk->flags = 0;
11347         chk->asoc = &stcb->asoc;
11348         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11349
11350         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11351         if (chk->data == NULL) {
11352                 sctp_free_a_chunk(stcb, chk, so_locked);
11353                 return;
11354         }
11355         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11356         SCTP_BUF_LEN(chk->data) = chk->send_size;
11357         chk->sent = SCTP_DATAGRAM_UNSENT;
11358         chk->snd_count = 0;
11359         chk->whoTo = net;
11360         atomic_add_int(&chk->whoTo->ref_count, 1);
11361         /* Now we have a mbuf that we can fill in with the details */
11362         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11363         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11364         /* fill out chunk header */
11365         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11366         hb->ch.chunk_flags = 0;
11367         hb->ch.chunk_length = htons(chk->send_size);
11368         /* Fill out hb parameter */
11369         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11370         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11371         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11372         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11373         /* Did our user request this one, put it in */
11374         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11375         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11376         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11377                 /*
11378                  * we only take from the entropy pool if the address is not
11379                  * confirmed.
11380                  */
11381                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11382                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11383         } else {
11384                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11385                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11386         }
11387         switch (net->ro._l_addr.sa.sa_family) {
11388 #ifdef INET
11389         case AF_INET:
11390                 memcpy(hb->heartbeat.hb_info.address,
11391                     &net->ro._l_addr.sin.sin_addr,
11392                     sizeof(net->ro._l_addr.sin.sin_addr));
11393                 break;
11394 #endif
11395 #ifdef INET6
11396         case AF_INET6:
11397                 memcpy(hb->heartbeat.hb_info.address,
11398                     &net->ro._l_addr.sin6.sin6_addr,
11399                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11400                 break;
11401 #endif
11402         default:
11403                 if (chk->data) {
11404                         sctp_m_freem(chk->data);
11405                         chk->data = NULL;
11406                 }
11407                 sctp_free_a_chunk(stcb, chk, so_locked);
11408                 return;
11409                 break;
11410         }
11411         net->hb_responded = 0;
11412         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11413         stcb->asoc.ctrl_queue_cnt++;
11414         SCTP_STAT_INCR(sctps_sendheartbeat);
11415         return;
11416 }
11417
11418 void
11419 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11420     uint32_t high_tsn)
11421 {
11422         struct sctp_association *asoc;
11423         struct sctp_ecne_chunk *ecne;
11424         struct sctp_tmit_chunk *chk;
11425
11426         if (net == NULL) {
11427                 return;
11428         }
11429         asoc = &stcb->asoc;
11430         SCTP_TCB_LOCK_ASSERT(stcb);
11431         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11432                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11433                         /* found a previous ECN_ECHO update it if needed */
11434                         uint32_t cnt, ctsn;
11435
11436                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11437                         ctsn = ntohl(ecne->tsn);
11438                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11439                                 ecne->tsn = htonl(high_tsn);
11440                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11441                         }
11442                         cnt = ntohl(ecne->num_pkts_since_cwr);
11443                         cnt++;
11444                         ecne->num_pkts_since_cwr = htonl(cnt);
11445                         return;
11446                 }
11447         }
11448         /* nope could not find one to update so we must build one */
11449         sctp_alloc_a_chunk(stcb, chk);
11450         if (chk == NULL) {
11451                 return;
11452         }
11453         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11454         chk->copy_by_ref = 0;
11455         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11456         chk->rec.chunk_id.can_take_data = 0;
11457         chk->flags = 0;
11458         chk->asoc = &stcb->asoc;
11459         chk->send_size = sizeof(struct sctp_ecne_chunk);
11460         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11461         if (chk->data == NULL) {
11462                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11463                 return;
11464         }
11465         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11466         SCTP_BUF_LEN(chk->data) = chk->send_size;
11467         chk->sent = SCTP_DATAGRAM_UNSENT;
11468         chk->snd_count = 0;
11469         chk->whoTo = net;
11470         atomic_add_int(&chk->whoTo->ref_count, 1);
11471
11472         stcb->asoc.ecn_echo_cnt_onq++;
11473         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11474         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11475         ecne->ch.chunk_flags = 0;
11476         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11477         ecne->tsn = htonl(high_tsn);
11478         ecne->num_pkts_since_cwr = htonl(1);
11479         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11480         asoc->ctrl_queue_cnt++;
11481 }
11482
11483 void
11484 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11485     struct mbuf *m, int len, int iphlen, int bad_crc)
11486 {
11487         struct sctp_association *asoc;
11488         struct sctp_pktdrop_chunk *drp;
11489         struct sctp_tmit_chunk *chk;
11490         uint8_t *datap;
11491         int was_trunc = 0;
11492         int fullsz = 0;
11493         long spc;
11494         int offset;
11495         struct sctp_chunkhdr *ch, chunk_buf;
11496         unsigned int chk_length;
11497
11498         if (!stcb) {
11499                 return;
11500         }
11501         asoc = &stcb->asoc;
11502         SCTP_TCB_LOCK_ASSERT(stcb);
11503         if (asoc->pktdrop_supported == 0) {
11504                 /*-
11505                  * peer must declare support before I send one.
11506                  */
11507                 return;
11508         }
11509         if (stcb->sctp_socket == NULL) {
11510                 return;
11511         }
11512         sctp_alloc_a_chunk(stcb, chk);
11513         if (chk == NULL) {
11514                 return;
11515         }
11516         chk->copy_by_ref = 0;
11517         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11518         chk->rec.chunk_id.can_take_data = 1;
11519         chk->flags = 0;
11520         len -= iphlen;
11521         chk->send_size = len;
11522         /* Validate that we do not have an ABORT in here. */
11523         offset = iphlen + sizeof(struct sctphdr);
11524         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11525             sizeof(*ch), (uint8_t *)&chunk_buf);
11526         while (ch != NULL) {
11527                 chk_length = ntohs(ch->chunk_length);
11528                 if (chk_length < sizeof(*ch)) {
11529                         /* break to abort land */
11530                         break;
11531                 }
11532                 switch (ch->chunk_type) {
11533                 case SCTP_PACKET_DROPPED:
11534                 case SCTP_ABORT_ASSOCIATION:
11535                 case SCTP_INITIATION_ACK:
11536                         /**
11537                          * We don't respond with an PKT-DROP to an ABORT
11538                          * or PKT-DROP. We also do not respond to an
11539                          * INIT-ACK, because we can't know if the initiation
11540                          * tag is correct or not.
11541                          */
11542                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11543                         return;
11544                 default:
11545                         break;
11546                 }
11547                 offset += SCTP_SIZE32(chk_length);
11548                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11549                     sizeof(*ch), (uint8_t *)&chunk_buf);
11550         }
11551
11552         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11553             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11554                 /*
11555                  * only send 1 mtu worth, trim off the excess on the end.
11556                  */
11557                 fullsz = len;
11558                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11559                 was_trunc = 1;
11560         }
11561         chk->asoc = &stcb->asoc;
11562         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11563         if (chk->data == NULL) {
11564 jump_out:
11565                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11566                 return;
11567         }
11568         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11569         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11570         if (drp == NULL) {
11571                 sctp_m_freem(chk->data);
11572                 chk->data = NULL;
11573                 goto jump_out;
11574         }
11575         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11576             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11577         chk->book_size_scale = 0;
11578         if (was_trunc) {
11579                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11580                 drp->trunc_len = htons(fullsz);
11581                 /*
11582                  * Len is already adjusted to size minus overhead above take
11583                  * out the pkt_drop chunk itself from it.
11584                  */
11585                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11586                 len = chk->send_size;
11587         } else {
11588                 /* no truncation needed */
11589                 drp->ch.chunk_flags = 0;
11590                 drp->trunc_len = htons(0);
11591         }
11592         if (bad_crc) {
11593                 drp->ch.chunk_flags |= SCTP_BADCRC;
11594         }
11595         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11596         SCTP_BUF_LEN(chk->data) = chk->send_size;
11597         chk->sent = SCTP_DATAGRAM_UNSENT;
11598         chk->snd_count = 0;
11599         if (net) {
11600                 /* we should hit here */
11601                 chk->whoTo = net;
11602                 atomic_add_int(&chk->whoTo->ref_count, 1);
11603         } else {
11604                 chk->whoTo = NULL;
11605         }
11606         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11607         drp->ch.chunk_length = htons(chk->send_size);
11608         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11609         if (spc < 0) {
11610                 spc = 0;
11611         }
11612         drp->bottle_bw = htonl(spc);
11613         if (asoc->my_rwnd) {
11614                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11615                     asoc->size_on_all_streams +
11616                     asoc->my_rwnd_control_len +
11617                     stcb->sctp_socket->so_rcv.sb_cc);
11618         } else {
11619                 /*-
11620                  * If my rwnd is 0, possibly from mbuf depletion as well as
11621                  * space used, tell the peer there is NO space aka onq == bw
11622                  */
11623                 drp->current_onq = htonl(spc);
11624         }
11625         drp->reserved = 0;
11626         datap = drp->data;
11627         m_copydata(m, iphlen, len, (caddr_t)datap);
11628         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11629         asoc->ctrl_queue_cnt++;
11630 }
11631
11632 void
11633 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11634 {
11635         struct sctp_association *asoc;
11636         struct sctp_cwr_chunk *cwr;
11637         struct sctp_tmit_chunk *chk;
11638
11639         SCTP_TCB_LOCK_ASSERT(stcb);
11640         if (net == NULL) {
11641                 return;
11642         }
11643         asoc = &stcb->asoc;
11644         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11645                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11646                         /*
11647                          * found a previous CWR queued to same destination
11648                          * update it if needed
11649                          */
11650                         uint32_t ctsn;
11651
11652                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11653                         ctsn = ntohl(cwr->tsn);
11654                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11655                                 cwr->tsn = htonl(high_tsn);
11656                         }
11657                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11658                                 /* Make sure override is carried */
11659                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11660                         }
11661                         return;
11662                 }
11663         }
11664         sctp_alloc_a_chunk(stcb, chk);
11665         if (chk == NULL) {
11666                 return;
11667         }
11668         chk->copy_by_ref = 0;
11669         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11670         chk->rec.chunk_id.can_take_data = 1;
11671         chk->flags = 0;
11672         chk->asoc = &stcb->asoc;
11673         chk->send_size = sizeof(struct sctp_cwr_chunk);
11674         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11675         if (chk->data == NULL) {
11676                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11677                 return;
11678         }
11679         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11680         SCTP_BUF_LEN(chk->data) = chk->send_size;
11681         chk->sent = SCTP_DATAGRAM_UNSENT;
11682         chk->snd_count = 0;
11683         chk->whoTo = net;
11684         atomic_add_int(&chk->whoTo->ref_count, 1);
11685         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11686         cwr->ch.chunk_type = SCTP_ECN_CWR;
11687         cwr->ch.chunk_flags = override;
11688         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11689         cwr->tsn = htonl(high_tsn);
11690         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11691         asoc->ctrl_queue_cnt++;
11692 }
11693
11694 static int
11695 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11696     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11697 {
11698         uint16_t len, old_len, i;
11699         struct sctp_stream_reset_out_request *req_out;
11700         struct sctp_chunkhdr *ch;
11701         int at;
11702         int number_entries = 0;
11703
11704         ch = mtod(chk->data, struct sctp_chunkhdr *);
11705         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11706         /* get to new offset for the param. */
11707         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11708         /* now how long will this param be? */
11709         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11710                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11711                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11712                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11713                         number_entries++;
11714                 }
11715         }
11716         if (number_entries == 0) {
11717                 return (0);
11718         }
11719         if (number_entries == stcb->asoc.streamoutcnt) {
11720                 number_entries = 0;
11721         }
11722         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11723                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11724         }
11725         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11726         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11727         req_out->ph.param_length = htons(len);
11728         req_out->request_seq = htonl(seq);
11729         req_out->response_seq = htonl(resp_seq);
11730         req_out->send_reset_at_tsn = htonl(last_sent);
11731         at = 0;
11732         if (number_entries) {
11733                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11734                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11735                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11736                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11737                                 req_out->list_of_streams[at] = htons(i);
11738                                 at++;
11739                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11740                                 if (at >= number_entries) {
11741                                         break;
11742                                 }
11743                         }
11744                 }
11745         } else {
11746                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11747                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11748                 }
11749         }
11750         if (SCTP_SIZE32(len) > len) {
11751                 /*-
11752                  * Need to worry about the pad we may end up adding to the
11753                  * end. This is easy since the struct is either aligned to 4
11754                  * bytes or 2 bytes off.
11755                  */
11756                 req_out->list_of_streams[number_entries] = 0;
11757         }
11758         /* now fix the chunk length */
11759         ch->chunk_length = htons(len + old_len);
11760         chk->book_size = len + old_len;
11761         chk->book_size_scale = 0;
11762         chk->send_size = SCTP_SIZE32(chk->book_size);
11763         SCTP_BUF_LEN(chk->data) = chk->send_size;
11764         return (1);
11765 }
11766
11767 static void
11768 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11769     int number_entries, uint16_t *list,
11770     uint32_t seq)
11771 {
11772         uint16_t len, old_len, i;
11773         struct sctp_stream_reset_in_request *req_in;
11774         struct sctp_chunkhdr *ch;
11775
11776         ch = mtod(chk->data, struct sctp_chunkhdr *);
11777         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11778
11779         /* get to new offset for the param. */
11780         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11781         /* now how long will this param be? */
11782         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11783         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11784         req_in->ph.param_length = htons(len);
11785         req_in->request_seq = htonl(seq);
11786         if (number_entries) {
11787                 for (i = 0; i < number_entries; i++) {
11788                         req_in->list_of_streams[i] = htons(list[i]);
11789                 }
11790         }
11791         if (SCTP_SIZE32(len) > len) {
11792                 /*-
11793                  * Need to worry about the pad we may end up adding to the
11794                  * end. This is easy since the struct is either aligned to 4
11795                  * bytes or 2 bytes off.
11796                  */
11797                 req_in->list_of_streams[number_entries] = 0;
11798         }
11799         /* now fix the chunk length */
11800         ch->chunk_length = htons(len + old_len);
11801         chk->book_size = len + old_len;
11802         chk->book_size_scale = 0;
11803         chk->send_size = SCTP_SIZE32(chk->book_size);
11804         SCTP_BUF_LEN(chk->data) = chk->send_size;
11805         return;
11806 }
11807
11808 static void
11809 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11810     uint32_t seq)
11811 {
11812         uint16_t len, old_len;
11813         struct sctp_stream_reset_tsn_request *req_tsn;
11814         struct sctp_chunkhdr *ch;
11815
11816         ch = mtod(chk->data, struct sctp_chunkhdr *);
11817         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11818
11819         /* get to new offset for the param. */
11820         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11821         /* now how long will this param be? */
11822         len = sizeof(struct sctp_stream_reset_tsn_request);
11823         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11824         req_tsn->ph.param_length = htons(len);
11825         req_tsn->request_seq = htonl(seq);
11826
11827         /* now fix the chunk length */
11828         ch->chunk_length = htons(len + old_len);
11829         chk->send_size = len + old_len;
11830         chk->book_size = SCTP_SIZE32(chk->send_size);
11831         chk->book_size_scale = 0;
11832         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11833         return;
11834 }
11835
11836 void
11837 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11838     uint32_t resp_seq, uint32_t result)
11839 {
11840         uint16_t len, old_len;
11841         struct sctp_stream_reset_response *resp;
11842         struct sctp_chunkhdr *ch;
11843
11844         ch = mtod(chk->data, struct sctp_chunkhdr *);
11845         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11846
11847         /* get to new offset for the param. */
11848         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11849         /* now how long will this param be? */
11850         len = sizeof(struct sctp_stream_reset_response);
11851         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11852         resp->ph.param_length = htons(len);
11853         resp->response_seq = htonl(resp_seq);
11854         resp->result = ntohl(result);
11855
11856         /* now fix the chunk length */
11857         ch->chunk_length = htons(len + old_len);
11858         chk->book_size = len + old_len;
11859         chk->book_size_scale = 0;
11860         chk->send_size = SCTP_SIZE32(chk->book_size);
11861         SCTP_BUF_LEN(chk->data) = chk->send_size;
11862         return;
11863 }
11864
11865 void
11866 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11867     struct sctp_stream_reset_list *ent,
11868     int response)
11869 {
11870         struct sctp_association *asoc;
11871         struct sctp_tmit_chunk *chk;
11872         struct sctp_chunkhdr *ch;
11873
11874         asoc = &stcb->asoc;
11875
11876         /*
11877          * Reset our last reset action to the new one IP -> response
11878          * (PERFORMED probably). This assures that if we fail to send, a
11879          * retran from the peer will get the new response.
11880          */
11881         asoc->last_reset_action[0] = response;
11882         if (asoc->stream_reset_outstanding) {
11883                 return;
11884         }
11885         sctp_alloc_a_chunk(stcb, chk);
11886         if (chk == NULL) {
11887                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11888                 return;
11889         }
11890         chk->copy_by_ref = 0;
11891         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11892         chk->rec.chunk_id.can_take_data = 0;
11893         chk->flags = 0;
11894         chk->asoc = &stcb->asoc;
11895         chk->book_size = sizeof(struct sctp_chunkhdr);
11896         chk->send_size = SCTP_SIZE32(chk->book_size);
11897         chk->book_size_scale = 0;
11898         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11899         if (chk->data == NULL) {
11900                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11901                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11902                 return;
11903         }
11904         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11905         /* setup chunk parameters */
11906         chk->sent = SCTP_DATAGRAM_UNSENT;
11907         chk->snd_count = 0;
11908         if (stcb->asoc.alternate) {
11909                 chk->whoTo = stcb->asoc.alternate;
11910         } else {
11911                 chk->whoTo = stcb->asoc.primary_destination;
11912         }
11913         ch = mtod(chk->data, struct sctp_chunkhdr *);
11914         ch->chunk_type = SCTP_STREAM_RESET;
11915         ch->chunk_flags = 0;
11916         ch->chunk_length = htons(chk->book_size);
11917         atomic_add_int(&chk->whoTo->ref_count, 1);
11918         SCTP_BUF_LEN(chk->data) = chk->send_size;
11919         sctp_add_stream_reset_result(chk, ent->seq, response);
11920         /* insert the chunk for sending */
11921         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11922             chk,
11923             sctp_next);
11924         asoc->ctrl_queue_cnt++;
11925 }
11926
11927 void
11928 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11929     uint32_t resp_seq, uint32_t result,
11930     uint32_t send_una, uint32_t recv_next)
11931 {
11932         uint16_t len, old_len;
11933         struct sctp_stream_reset_response_tsn *resp;
11934         struct sctp_chunkhdr *ch;
11935
11936         ch = mtod(chk->data, struct sctp_chunkhdr *);
11937         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11938
11939         /* get to new offset for the param. */
11940         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11941         /* now how long will this param be? */
11942         len = sizeof(struct sctp_stream_reset_response_tsn);
11943         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11944         resp->ph.param_length = htons(len);
11945         resp->response_seq = htonl(resp_seq);
11946         resp->result = htonl(result);
11947         resp->senders_next_tsn = htonl(send_una);
11948         resp->receivers_next_tsn = htonl(recv_next);
11949
11950         /* now fix the chunk length */
11951         ch->chunk_length = htons(len + old_len);
11952         chk->book_size = len + old_len;
11953         chk->send_size = SCTP_SIZE32(chk->book_size);
11954         chk->book_size_scale = 0;
11955         SCTP_BUF_LEN(chk->data) = chk->send_size;
11956         return;
11957 }
11958
11959 static void
11960 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11961     uint32_t seq,
11962     uint16_t adding)
11963 {
11964         uint16_t len, old_len;
11965         struct sctp_chunkhdr *ch;
11966         struct sctp_stream_reset_add_strm *addstr;
11967
11968         ch = mtod(chk->data, struct sctp_chunkhdr *);
11969         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11970
11971         /* get to new offset for the param. */
11972         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11973         /* now how long will this param be? */
11974         len = sizeof(struct sctp_stream_reset_add_strm);
11975
11976         /* Fill it out. */
11977         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11978         addstr->ph.param_length = htons(len);
11979         addstr->request_seq = htonl(seq);
11980         addstr->number_of_streams = htons(adding);
11981         addstr->reserved = 0;
11982
11983         /* now fix the chunk length */
11984         ch->chunk_length = htons(len + old_len);
11985         chk->send_size = len + old_len;
11986         chk->book_size = SCTP_SIZE32(chk->send_size);
11987         chk->book_size_scale = 0;
11988         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11989         return;
11990 }
11991
11992 static void
11993 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11994     uint32_t seq,
11995     uint16_t adding)
11996 {
11997         uint16_t len, old_len;
11998         struct sctp_chunkhdr *ch;
11999         struct sctp_stream_reset_add_strm *addstr;
12000
12001         ch = mtod(chk->data, struct sctp_chunkhdr *);
12002         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12003
12004         /* get to new offset for the param. */
12005         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12006         /* now how long will this param be? */
12007         len = sizeof(struct sctp_stream_reset_add_strm);
12008         /* Fill it out. */
12009         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12010         addstr->ph.param_length = htons(len);
12011         addstr->request_seq = htonl(seq);
12012         addstr->number_of_streams = htons(adding);
12013         addstr->reserved = 0;
12014
12015         /* now fix the chunk length */
12016         ch->chunk_length = htons(len + old_len);
12017         chk->send_size = len + old_len;
12018         chk->book_size = SCTP_SIZE32(chk->send_size);
12019         chk->book_size_scale = 0;
12020         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12021         return;
12022 }
12023
12024 int
12025 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12026 {
12027         struct sctp_association *asoc;
12028         struct sctp_tmit_chunk *chk;
12029         struct sctp_chunkhdr *ch;
12030         uint32_t seq;
12031
12032         asoc = &stcb->asoc;
12033         asoc->trigger_reset = 0;
12034         if (asoc->stream_reset_outstanding) {
12035                 return (EALREADY);
12036         }
12037         sctp_alloc_a_chunk(stcb, chk);
12038         if (chk == NULL) {
12039                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12040                 return (ENOMEM);
12041         }
12042         chk->copy_by_ref = 0;
12043         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12044         chk->rec.chunk_id.can_take_data = 0;
12045         chk->flags = 0;
12046         chk->asoc = &stcb->asoc;
12047         chk->book_size = sizeof(struct sctp_chunkhdr);
12048         chk->send_size = SCTP_SIZE32(chk->book_size);
12049         chk->book_size_scale = 0;
12050         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12051         if (chk->data == NULL) {
12052                 sctp_free_a_chunk(stcb, chk, so_locked);
12053                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12054                 return (ENOMEM);
12055         }
12056         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12057
12058         /* setup chunk parameters */
12059         chk->sent = SCTP_DATAGRAM_UNSENT;
12060         chk->snd_count = 0;
12061         if (stcb->asoc.alternate) {
12062                 chk->whoTo = stcb->asoc.alternate;
12063         } else {
12064                 chk->whoTo = stcb->asoc.primary_destination;
12065         }
12066         ch = mtod(chk->data, struct sctp_chunkhdr *);
12067         ch->chunk_type = SCTP_STREAM_RESET;
12068         ch->chunk_flags = 0;
12069         ch->chunk_length = htons(chk->book_size);
12070         atomic_add_int(&chk->whoTo->ref_count, 1);
12071         SCTP_BUF_LEN(chk->data) = chk->send_size;
12072         seq = stcb->asoc.str_reset_seq_out;
12073         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12074                 seq++;
12075                 asoc->stream_reset_outstanding++;
12076         } else {
12077                 m_freem(chk->data);
12078                 chk->data = NULL;
12079                 sctp_free_a_chunk(stcb, chk, so_locked);
12080                 return (ENOENT);
12081         }
12082         asoc->str_reset = chk;
12083         /* insert the chunk for sending */
12084         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12085             chk,
12086             sctp_next);
12087         asoc->ctrl_queue_cnt++;
12088
12089         if (stcb->asoc.send_sack) {
12090                 sctp_send_sack(stcb, so_locked);
12091         }
12092         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12093         return (0);
12094 }
12095
12096 int
12097 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12098     uint16_t number_entries, uint16_t *list,
12099     uint8_t send_in_req,
12100     uint8_t send_tsn_req,
12101     uint8_t add_stream,
12102     uint16_t adding_o,
12103     uint16_t adding_i, uint8_t peer_asked)
12104 {
12105         struct sctp_association *asoc;
12106         struct sctp_tmit_chunk *chk;
12107         struct sctp_chunkhdr *ch;
12108         int can_send_out_req = 0;
12109         uint32_t seq;
12110
12111         asoc = &stcb->asoc;
12112         if (asoc->stream_reset_outstanding) {
12113                 /*-
12114                  * Already one pending, must get ACK back to clear the flag.
12115                  */
12116                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12117                 return (EBUSY);
12118         }
12119         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12120             (add_stream == 0)) {
12121                 /* nothing to do */
12122                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12123                 return (EINVAL);
12124         }
12125         if (send_tsn_req && send_in_req) {
12126                 /* error, can't do that */
12127                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12128                 return (EINVAL);
12129         } else if (send_in_req) {
12130                 can_send_out_req = 1;
12131         }
12132         if (number_entries > (MCLBYTES -
12133             SCTP_MIN_OVERHEAD -
12134             sizeof(struct sctp_chunkhdr) -
12135             sizeof(struct sctp_stream_reset_out_request)) /
12136             sizeof(uint16_t)) {
12137                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12138                 return (ENOMEM);
12139         }
12140         sctp_alloc_a_chunk(stcb, chk);
12141         if (chk == NULL) {
12142                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12143                 return (ENOMEM);
12144         }
12145         chk->copy_by_ref = 0;
12146         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12147         chk->rec.chunk_id.can_take_data = 0;
12148         chk->flags = 0;
12149         chk->asoc = &stcb->asoc;
12150         chk->book_size = sizeof(struct sctp_chunkhdr);
12151         chk->send_size = SCTP_SIZE32(chk->book_size);
12152         chk->book_size_scale = 0;
12153         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12154         if (chk->data == NULL) {
12155                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12156                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12157                 return (ENOMEM);
12158         }
12159         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12160
12161         /* setup chunk parameters */
12162         chk->sent = SCTP_DATAGRAM_UNSENT;
12163         chk->snd_count = 0;
12164         if (stcb->asoc.alternate) {
12165                 chk->whoTo = stcb->asoc.alternate;
12166         } else {
12167                 chk->whoTo = stcb->asoc.primary_destination;
12168         }
12169         atomic_add_int(&chk->whoTo->ref_count, 1);
12170         ch = mtod(chk->data, struct sctp_chunkhdr *);
12171         ch->chunk_type = SCTP_STREAM_RESET;
12172         ch->chunk_flags = 0;
12173         ch->chunk_length = htons(chk->book_size);
12174         SCTP_BUF_LEN(chk->data) = chk->send_size;
12175
12176         seq = stcb->asoc.str_reset_seq_out;
12177         if (can_send_out_req) {
12178                 int ret;
12179
12180                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12181                 if (ret) {
12182                         seq++;
12183                         asoc->stream_reset_outstanding++;
12184                 }
12185         }
12186         if ((add_stream & 1) &&
12187             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12188                 /* Need to allocate more */
12189                 struct sctp_stream_out *oldstream;
12190                 struct sctp_stream_queue_pending *sp, *nsp;
12191                 int i;
12192 #if defined(SCTP_DETAILED_STR_STATS)
12193                 int j;
12194 #endif
12195
12196                 oldstream = stcb->asoc.strmout;
12197                 /* get some more */
12198                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12199                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12200                     SCTP_M_STRMO);
12201                 if (stcb->asoc.strmout == NULL) {
12202                         uint8_t x;
12203
12204                         stcb->asoc.strmout = oldstream;
12205                         /* Turn off the bit */
12206                         x = add_stream & 0xfe;
12207                         add_stream = x;
12208                         goto skip_stuff;
12209                 }
12210                 /*
12211                  * Ok now we proceed with copying the old out stuff and
12212                  * initializing the new stuff.
12213                  */
12214                 SCTP_TCB_SEND_LOCK(stcb);
12215                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12216                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12217                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12218                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12219                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12220                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12221                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12222                         stcb->asoc.strmout[i].sid = i;
12223                         stcb->asoc.strmout[i].state = oldstream[i].state;
12224                         /* FIX ME FIX ME */
12225                         /*
12226                          * This should be a SS_COPY operation FIX ME STREAM
12227                          * SCHEDULER EXPERT
12228                          */
12229                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12230                         /* now anything on those queues? */
12231                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12232                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12233                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12234                         }
12235
12236                 }
12237                 /* now the new streams */
12238                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12239                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12240                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12241                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12242 #if defined(SCTP_DETAILED_STR_STATS)
12243                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12244                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12245                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12246                         }
12247 #else
12248                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12249                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12250 #endif
12251                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12252                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12253                         stcb->asoc.strmout[i].sid = i;
12254                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12255                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12256                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12257                 }
12258                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12259                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12260                 SCTP_TCB_SEND_UNLOCK(stcb);
12261         }
12262 skip_stuff:
12263         if ((add_stream & 1) && (adding_o > 0)) {
12264                 asoc->strm_pending_add_size = adding_o;
12265                 asoc->peer_req_out = peer_asked;
12266                 sctp_add_an_out_stream(chk, seq, adding_o);
12267                 seq++;
12268                 asoc->stream_reset_outstanding++;
12269         }
12270         if ((add_stream & 2) && (adding_i > 0)) {
12271                 sctp_add_an_in_stream(chk, seq, adding_i);
12272                 seq++;
12273                 asoc->stream_reset_outstanding++;
12274         }
12275         if (send_in_req) {
12276                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12277                 seq++;
12278                 asoc->stream_reset_outstanding++;
12279         }
12280         if (send_tsn_req) {
12281                 sctp_add_stream_reset_tsn(chk, seq);
12282                 asoc->stream_reset_outstanding++;
12283         }
12284         asoc->str_reset = chk;
12285         /* insert the chunk for sending */
12286         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12287             chk,
12288             sctp_next);
12289         asoc->ctrl_queue_cnt++;
12290         if (stcb->asoc.send_sack) {
12291                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12292         }
12293         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12294         return (0);
12295 }
12296
12297 void
12298 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12299     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12300     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12301     uint32_t vrf_id, uint16_t port)
12302 {
12303         /* Don't respond to an ABORT with an ABORT. */
12304         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12305                 if (cause)
12306                         sctp_m_freem(cause);
12307                 return;
12308         }
12309         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12310             mflowtype, mflowid, fibnum,
12311             vrf_id, port);
12312         return;
12313 }
12314
12315 void
12316 sctp_send_operr_to(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         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12322             mflowtype, mflowid, fibnum,
12323             vrf_id, port);
12324         return;
12325 }
12326
12327 static struct mbuf *
12328 sctp_copy_resume(struct uio *uio,
12329     int max_send_len,
12330     int user_marks_eor,
12331     int *error,
12332     uint32_t *sndout,
12333     struct mbuf **new_tail)
12334 {
12335         struct mbuf *m;
12336
12337         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12338             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12339         if (m == NULL) {
12340                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12341                 *error = ENOBUFS;
12342         } else {
12343                 *sndout = m_length(m, NULL);
12344                 *new_tail = m_last(m);
12345         }
12346         return (m);
12347 }
12348
12349 static int
12350 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12351     struct uio *uio,
12352     int resv_upfront)
12353 {
12354         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12355             resv_upfront, 0);
12356         if (sp->data == NULL) {
12357                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12358                 return (ENOBUFS);
12359         }
12360
12361         sp->tail_mbuf = m_last(sp->data);
12362         return (0);
12363 }
12364
12365
12366
12367 static struct sctp_stream_queue_pending *
12368 sctp_copy_it_in(struct sctp_tcb *stcb,
12369     struct sctp_association *asoc,
12370     struct sctp_sndrcvinfo *srcv,
12371     struct uio *uio,
12372     struct sctp_nets *net,
12373     int max_send_len,
12374     int user_marks_eor,
12375     int *error)
12376 {
12377
12378         /*-
12379          * This routine must be very careful in its work. Protocol
12380          * processing is up and running so care must be taken to spl...()
12381          * when you need to do something that may effect the stcb/asoc. The
12382          * sb is locked however. When data is copied the protocol processing
12383          * should be enabled since this is a slower operation...
12384          */
12385         struct sctp_stream_queue_pending *sp = NULL;
12386         int resv_in_first;
12387
12388         *error = 0;
12389         /* Now can we send this? */
12390         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12391             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12392             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12393             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12394                 /* got data while shutting down */
12395                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12396                 *error = ECONNRESET;
12397                 goto out_now;
12398         }
12399         sctp_alloc_a_strmoq(stcb, sp);
12400         if (sp == NULL) {
12401                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12402                 *error = ENOMEM;
12403                 goto out_now;
12404         }
12405         sp->act_flags = 0;
12406         sp->sender_all_done = 0;
12407         sp->sinfo_flags = srcv->sinfo_flags;
12408         sp->timetolive = srcv->sinfo_timetolive;
12409         sp->ppid = srcv->sinfo_ppid;
12410         sp->context = srcv->sinfo_context;
12411         sp->fsn = 0;
12412         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12413
12414         sp->sid = srcv->sinfo_stream;
12415         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12416         if ((sp->length == (uint32_t)uio->uio_resid) &&
12417             ((user_marks_eor == 0) ||
12418             (srcv->sinfo_flags & SCTP_EOF) ||
12419             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12420                 sp->msg_is_complete = 1;
12421         } else {
12422                 sp->msg_is_complete = 0;
12423         }
12424         sp->sender_all_done = 0;
12425         sp->some_taken = 0;
12426         sp->put_last_out = 0;
12427         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12428         sp->data = sp->tail_mbuf = NULL;
12429         if (sp->length == 0) {
12430                 goto skip_copy;
12431         }
12432         if (srcv->sinfo_keynumber_valid) {
12433                 sp->auth_keyid = srcv->sinfo_keynumber;
12434         } else {
12435                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12436         }
12437         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12438                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12439                 sp->holds_key_ref = 1;
12440         }
12441         *error = sctp_copy_one(sp, uio, resv_in_first);
12442 skip_copy:
12443         if (*error) {
12444                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12445                 sp = NULL;
12446         } else {
12447                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12448                         sp->net = net;
12449                         atomic_add_int(&sp->net->ref_count, 1);
12450                 } else {
12451                         sp->net = NULL;
12452                 }
12453                 sctp_set_prsctp_policy(sp);
12454         }
12455 out_now:
12456         return (sp);
12457 }
12458
12459
12460 int
12461 sctp_sosend(struct socket *so,
12462     struct sockaddr *addr,
12463     struct uio *uio,
12464     struct mbuf *top,
12465     struct mbuf *control,
12466     int flags,
12467     struct thread *p
12468 )
12469 {
12470         int error, use_sndinfo = 0;
12471         struct sctp_sndrcvinfo sndrcvninfo;
12472         struct sockaddr *addr_to_use;
12473 #if defined(INET) && defined(INET6)
12474         struct sockaddr_in sin;
12475 #endif
12476
12477         if (control) {
12478                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12479                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12480                     sizeof(sndrcvninfo))) {
12481                         /* got one */
12482                         use_sndinfo = 1;
12483                 }
12484         }
12485         addr_to_use = addr;
12486 #if defined(INET) && defined(INET6)
12487         if ((addr) && (addr->sa_family == AF_INET6)) {
12488                 struct sockaddr_in6 *sin6;
12489
12490                 sin6 = (struct sockaddr_in6 *)addr;
12491                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12492                         in6_sin6_2_sin(&sin, sin6);
12493                         addr_to_use = (struct sockaddr *)&sin;
12494                 }
12495         }
12496 #endif
12497         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12498             control,
12499             flags,
12500             use_sndinfo ? &sndrcvninfo : NULL
12501             ,p
12502             );
12503         return (error);
12504 }
12505
12506
12507 int
12508 sctp_lower_sosend(struct socket *so,
12509     struct sockaddr *addr,
12510     struct uio *uio,
12511     struct mbuf *i_pak,
12512     struct mbuf *control,
12513     int flags,
12514     struct sctp_sndrcvinfo *srcv
12515     ,
12516     struct thread *p
12517 )
12518 {
12519         unsigned int sndlen = 0, max_len;
12520         int error, len;
12521         struct mbuf *top = NULL;
12522         int queue_only = 0, queue_only_for_init = 0;
12523         int free_cnt_applied = 0;
12524         int un_sent;
12525         int now_filled = 0;
12526         unsigned int inqueue_bytes = 0;
12527         struct sctp_block_entry be;
12528         struct sctp_inpcb *inp;
12529         struct sctp_tcb *stcb = NULL;
12530         struct timeval now;
12531         struct sctp_nets *net;
12532         struct sctp_association *asoc;
12533         struct sctp_inpcb *t_inp;
12534         int user_marks_eor;
12535         int create_lock_applied = 0;
12536         int nagle_applies = 0;
12537         int some_on_control = 0;
12538         int got_all_of_the_send = 0;
12539         int hold_tcblock = 0;
12540         int non_blocking = 0;
12541         uint32_t local_add_more, local_soresv = 0;
12542         uint16_t port;
12543         uint16_t sinfo_flags;
12544         sctp_assoc_t sinfo_assoc_id;
12545
12546         error = 0;
12547         net = NULL;
12548         stcb = NULL;
12549         asoc = NULL;
12550
12551         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12552         if (inp == NULL) {
12553                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12554                 error = EINVAL;
12555                 if (i_pak) {
12556                         SCTP_RELEASE_PKT(i_pak);
12557                 }
12558                 return (error);
12559         }
12560         if ((uio == NULL) && (i_pak == NULL)) {
12561                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12562                 return (EINVAL);
12563         }
12564         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12565         atomic_add_int(&inp->total_sends, 1);
12566         if (uio) {
12567                 if (uio->uio_resid < 0) {
12568                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12569                         return (EINVAL);
12570                 }
12571                 sndlen = (unsigned int)uio->uio_resid;
12572         } else {
12573                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12574                 sndlen = SCTP_HEADER_LEN(i_pak);
12575         }
12576         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12577             (void *)addr,
12578             sndlen);
12579         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12580             SCTP_IS_LISTENING(inp)) {
12581                 /* The listener can NOT send */
12582                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12583                 error = ENOTCONN;
12584                 goto out_unlocked;
12585         }
12586         /**
12587          * Pre-screen address, if one is given the sin-len
12588          * must be set correctly!
12589          */
12590         if (addr) {
12591                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12592
12593                 switch (raddr->sa.sa_family) {
12594 #ifdef INET
12595                 case AF_INET:
12596                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12597                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12598                                 error = EINVAL;
12599                                 goto out_unlocked;
12600                         }
12601                         port = raddr->sin.sin_port;
12602                         break;
12603 #endif
12604 #ifdef INET6
12605                 case AF_INET6:
12606                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12607                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12608                                 error = EINVAL;
12609                                 goto out_unlocked;
12610                         }
12611                         port = raddr->sin6.sin6_port;
12612                         break;
12613 #endif
12614                 default:
12615                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12616                         error = EAFNOSUPPORT;
12617                         goto out_unlocked;
12618                 }
12619         } else
12620                 port = 0;
12621
12622         if (srcv) {
12623                 sinfo_flags = srcv->sinfo_flags;
12624                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12625                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12626                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12627                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12628                         error = EINVAL;
12629                         goto out_unlocked;
12630                 }
12631                 if (srcv->sinfo_flags)
12632                         SCTP_STAT_INCR(sctps_sends_with_flags);
12633         } else {
12634                 sinfo_flags = inp->def_send.sinfo_flags;
12635                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12636         }
12637         if (sinfo_flags & SCTP_SENDALL) {
12638                 /* its a sendall */
12639                 error = sctp_sendall(inp, uio, top, srcv);
12640                 top = NULL;
12641                 goto out_unlocked;
12642         }
12643         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12644                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12645                 error = EINVAL;
12646                 goto out_unlocked;
12647         }
12648         /* now we must find the assoc */
12649         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12650             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12651                 SCTP_INP_RLOCK(inp);
12652                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12653                 if (stcb) {
12654                         SCTP_TCB_LOCK(stcb);
12655                         hold_tcblock = 1;
12656                 }
12657                 SCTP_INP_RUNLOCK(inp);
12658         } else if (sinfo_assoc_id) {
12659                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12660                 if (stcb != NULL) {
12661                         hold_tcblock = 1;
12662                 }
12663         } else if (addr) {
12664                 /*-
12665                  * Since we did not use findep we must
12666                  * increment it, and if we don't find a tcb
12667                  * decrement it.
12668                  */
12669                 SCTP_INP_WLOCK(inp);
12670                 SCTP_INP_INCR_REF(inp);
12671                 SCTP_INP_WUNLOCK(inp);
12672                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12673                 if (stcb == NULL) {
12674                         SCTP_INP_WLOCK(inp);
12675                         SCTP_INP_DECR_REF(inp);
12676                         SCTP_INP_WUNLOCK(inp);
12677                 } else {
12678                         hold_tcblock = 1;
12679                 }
12680         }
12681         if ((stcb == NULL) && (addr)) {
12682                 /* Possible implicit send? */
12683                 SCTP_ASOC_CREATE_LOCK(inp);
12684                 create_lock_applied = 1;
12685                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12686                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12687                         /* Should I really unlock ? */
12688                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12689                         error = EINVAL;
12690                         goto out_unlocked;
12691
12692                 }
12693                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12694                     (addr->sa_family == AF_INET6)) {
12695                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12696                         error = EINVAL;
12697                         goto out_unlocked;
12698                 }
12699                 SCTP_INP_WLOCK(inp);
12700                 SCTP_INP_INCR_REF(inp);
12701                 SCTP_INP_WUNLOCK(inp);
12702                 /* With the lock applied look again */
12703                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12704 #if defined(INET) || defined(INET6)
12705                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12706                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12707                 }
12708 #endif
12709                 if (stcb == NULL) {
12710                         SCTP_INP_WLOCK(inp);
12711                         SCTP_INP_DECR_REF(inp);
12712                         SCTP_INP_WUNLOCK(inp);
12713                 } else {
12714                         hold_tcblock = 1;
12715                 }
12716                 if (error) {
12717                         goto out_unlocked;
12718                 }
12719                 if (t_inp != inp) {
12720                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12721                         error = ENOTCONN;
12722                         goto out_unlocked;
12723                 }
12724         }
12725         if (stcb == NULL) {
12726                 if (addr == NULL) {
12727                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12728                         error = ENOENT;
12729                         goto out_unlocked;
12730                 } else {
12731                         /* We must go ahead and start the INIT process */
12732                         uint32_t vrf_id;
12733
12734                         if ((sinfo_flags & SCTP_ABORT) ||
12735                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12736                                 /*-
12737                                  * User asks to abort a non-existant assoc,
12738                                  * or EOF a non-existant assoc with no data
12739                                  */
12740                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12741                                 error = ENOENT;
12742                                 goto out_unlocked;
12743                         }
12744                         /* get an asoc/stcb struct */
12745                         vrf_id = inp->def_vrf_id;
12746 #ifdef INVARIANTS
12747                         if (create_lock_applied == 0) {
12748                                 panic("Error, should hold create lock and I don't?");
12749                         }
12750 #endif
12751                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12752                             inp->sctp_ep.pre_open_stream_count,
12753                             inp->sctp_ep.port,
12754                             p);
12755                         if (stcb == NULL) {
12756                                 /* Error is setup for us in the call */
12757                                 goto out_unlocked;
12758                         }
12759                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12760                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12761                                 /*
12762                                  * Set the connected flag so we can queue
12763                                  * data
12764                                  */
12765                                 soisconnecting(so);
12766                         }
12767                         hold_tcblock = 1;
12768                         if (create_lock_applied) {
12769                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12770                                 create_lock_applied = 0;
12771                         } else {
12772                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12773                         }
12774                         /*
12775                          * Turn on queue only flag to prevent data from
12776                          * being sent
12777                          */
12778                         queue_only = 1;
12779                         asoc = &stcb->asoc;
12780                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12781                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12782
12783                         /* initialize authentication params for the assoc */
12784                         sctp_initialize_auth_params(inp, stcb);
12785
12786                         if (control) {
12787                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12788                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12789                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12790                                         hold_tcblock = 0;
12791                                         stcb = NULL;
12792                                         goto out_unlocked;
12793                                 }
12794                         }
12795                         /* out with the INIT */
12796                         queue_only_for_init = 1;
12797                         /*-
12798                          * we may want to dig in after this call and adjust the MTU
12799                          * value. It defaulted to 1500 (constant) but the ro
12800                          * structure may now have an update and thus we may need to
12801                          * change it BEFORE we append the message.
12802                          */
12803                 }
12804         } else
12805                 asoc = &stcb->asoc;
12806         if (srcv == NULL)
12807                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12808         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12809                 if (addr)
12810                         net = sctp_findnet(stcb, addr);
12811                 else
12812                         net = NULL;
12813                 if ((net == NULL) ||
12814                     ((port != 0) && (port != stcb->rport))) {
12815                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12816                         error = EINVAL;
12817                         goto out_unlocked;
12818                 }
12819         } else {
12820                 if (stcb->asoc.alternate) {
12821                         net = stcb->asoc.alternate;
12822                 } else {
12823                         net = stcb->asoc.primary_destination;
12824                 }
12825         }
12826         atomic_add_int(&stcb->total_sends, 1);
12827         /* Keep the stcb from being freed under our feet */
12828         atomic_add_int(&asoc->refcnt, 1);
12829         free_cnt_applied = 1;
12830
12831         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12832                 if (sndlen > asoc->smallest_mtu) {
12833                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12834                         error = EMSGSIZE;
12835                         goto out_unlocked;
12836                 }
12837         }
12838         if (SCTP_SO_IS_NBIO(so)
12839             || (flags & MSG_NBIO)
12840             ) {
12841                 non_blocking = 1;
12842         }
12843         /* would we block? */
12844         if (non_blocking) {
12845                 uint32_t amount;
12846
12847                 if (hold_tcblock == 0) {
12848                         SCTP_TCB_LOCK(stcb);
12849                         hold_tcblock = 1;
12850                 }
12851                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12852                 if (user_marks_eor == 0) {
12853                         amount = sndlen;
12854                 } else {
12855                         amount = 1;
12856                 }
12857                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12858                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12859                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12860                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12861                                 error = EMSGSIZE;
12862                         else
12863                                 error = EWOULDBLOCK;
12864                         goto out_unlocked;
12865                 }
12866                 stcb->asoc.sb_send_resv += sndlen;
12867                 SCTP_TCB_UNLOCK(stcb);
12868                 hold_tcblock = 0;
12869         } else {
12870                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12871         }
12872         local_soresv = sndlen;
12873         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12874                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12875                 error = ECONNRESET;
12876                 goto out_unlocked;
12877         }
12878         if (create_lock_applied) {
12879                 SCTP_ASOC_CREATE_UNLOCK(inp);
12880                 create_lock_applied = 0;
12881         }
12882         /* Is the stream no. valid? */
12883         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12884                 /* Invalid stream number */
12885                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12886                 error = EINVAL;
12887                 goto out_unlocked;
12888         }
12889         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12890             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12891                 /*
12892                  * Can't queue any data while stream reset is underway.
12893                  */
12894                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12895                         error = EAGAIN;
12896                 } else {
12897                         error = EINVAL;
12898                 }
12899                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12900                 goto out_unlocked;
12901         }
12902         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12903             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12904                 queue_only = 1;
12905         }
12906         /* we are now done with all control */
12907         if (control) {
12908                 sctp_m_freem(control);
12909                 control = NULL;
12910         }
12911         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12912             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12913             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12914             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12915                 if (srcv->sinfo_flags & SCTP_ABORT) {
12916                         ;
12917                 } else {
12918                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12919                         error = ECONNRESET;
12920                         goto out_unlocked;
12921                 }
12922         }
12923         /* Ok, we will attempt a msgsnd :> */
12924         if (p) {
12925                 p->td_ru.ru_msgsnd++;
12926         }
12927         /* Are we aborting? */
12928         if (srcv->sinfo_flags & SCTP_ABORT) {
12929                 struct mbuf *mm;
12930                 int tot_demand, tot_out = 0, max_out;
12931
12932                 SCTP_STAT_INCR(sctps_sends_with_abort);
12933                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12934                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12935                         /* It has to be up before we abort */
12936                         /* how big is the user initiated abort? */
12937                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12938                         error = EINVAL;
12939                         goto out;
12940                 }
12941                 if (hold_tcblock) {
12942                         SCTP_TCB_UNLOCK(stcb);
12943                         hold_tcblock = 0;
12944                 }
12945                 if (top) {
12946                         struct mbuf *cntm = NULL;
12947
12948                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12949                         if (sndlen != 0) {
12950                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12951                                         tot_out += SCTP_BUF_LEN(cntm);
12952                                 }
12953                         }
12954                 } else {
12955                         /* Must fit in a MTU */
12956                         tot_out = sndlen;
12957                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12958                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12959                                 /* To big */
12960                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12961                                 error = EMSGSIZE;
12962                                 goto out;
12963                         }
12964                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12965                 }
12966                 if (mm == NULL) {
12967                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12968                         error = ENOMEM;
12969                         goto out;
12970                 }
12971                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12972                 max_out -= sizeof(struct sctp_abort_msg);
12973                 if (tot_out > max_out) {
12974                         tot_out = max_out;
12975                 }
12976                 if (mm) {
12977                         struct sctp_paramhdr *ph;
12978
12979                         /* now move forward the data pointer */
12980                         ph = mtod(mm, struct sctp_paramhdr *);
12981                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12982                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12983                         ph++;
12984                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12985                         if (top == NULL) {
12986                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12987                                 if (error) {
12988                                         /*-
12989                                          * Here if we can't get his data we
12990                                          * still abort we just don't get to
12991                                          * send the users note :-0
12992                                          */
12993                                         sctp_m_freem(mm);
12994                                         mm = NULL;
12995                                 }
12996                         } else {
12997                                 if (sndlen != 0) {
12998                                         SCTP_BUF_NEXT(mm) = top;
12999                                 }
13000                         }
13001                 }
13002                 if (hold_tcblock == 0) {
13003                         SCTP_TCB_LOCK(stcb);
13004                 }
13005                 atomic_add_int(&stcb->asoc.refcnt, -1);
13006                 free_cnt_applied = 0;
13007                 /* release this lock, otherwise we hang on ourselves */
13008                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13009                 /* now relock the stcb so everything is sane */
13010                 hold_tcblock = 0;
13011                 stcb = NULL;
13012                 /*
13013                  * In this case top is already chained to mm avoid double
13014                  * free, since we free it below if top != NULL and driver
13015                  * would free it after sending the packet out
13016                  */
13017                 if (sndlen != 0) {
13018                         top = NULL;
13019                 }
13020                 goto out_unlocked;
13021         }
13022         /* Calculate the maximum we can send */
13023         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13024         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13025                 if (non_blocking) {
13026                         /* we already checked for non-blocking above. */
13027                         max_len = sndlen;
13028                 } else {
13029                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13030                 }
13031         } else {
13032                 max_len = 0;
13033         }
13034         if (hold_tcblock) {
13035                 SCTP_TCB_UNLOCK(stcb);
13036                 hold_tcblock = 0;
13037         }
13038         if (asoc->strmout == NULL) {
13039                 /* huh? software error */
13040                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13041                 error = EFAULT;
13042                 goto out_unlocked;
13043         }
13044
13045         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13046         if ((user_marks_eor == 0) &&
13047             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13048                 /* It will NEVER fit */
13049                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13050                 error = EMSGSIZE;
13051                 goto out_unlocked;
13052         }
13053         if ((uio == NULL) && user_marks_eor) {
13054                 /*-
13055                  * We do not support eeor mode for
13056                  * sending with mbuf chains (like sendfile).
13057                  */
13058                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13059                 error = EINVAL;
13060                 goto out_unlocked;
13061         }
13062
13063         if (user_marks_eor) {
13064                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13065         } else {
13066                 /*-
13067                  * For non-eeor the whole message must fit in
13068                  * the socket send buffer.
13069                  */
13070                 local_add_more = sndlen;
13071         }
13072         len = 0;
13073         if (non_blocking) {
13074                 goto skip_preblock;
13075         }
13076         if (((max_len <= local_add_more) &&
13077             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13078             (max_len == 0) ||
13079             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13080                 /* No room right now ! */
13081                 SOCKBUF_LOCK(&so->so_snd);
13082                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13083                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13084                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13085                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13086                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13087                             inqueue_bytes,
13088                             local_add_more,
13089                             stcb->asoc.stream_queue_cnt,
13090                             stcb->asoc.chunks_on_out_queue,
13091                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13092                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13093                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13094                         }
13095                         be.error = 0;
13096                         stcb->block_entry = &be;
13097                         error = sbwait(&so->so_snd);
13098                         stcb->block_entry = NULL;
13099                         if (error || so->so_error || be.error) {
13100                                 if (error == 0) {
13101                                         if (so->so_error)
13102                                                 error = so->so_error;
13103                                         if (be.error) {
13104                                                 error = be.error;
13105                                         }
13106                                 }
13107                                 SOCKBUF_UNLOCK(&so->so_snd);
13108                                 goto out_unlocked;
13109                         }
13110                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13111                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13112                                     asoc, stcb->asoc.total_output_queue_size);
13113                         }
13114                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13115                                 SOCKBUF_UNLOCK(&so->so_snd);
13116                                 goto out_unlocked;
13117                         }
13118                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13119                 }
13120                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13121                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13122                 } else {
13123                         max_len = 0;
13124                 }
13125                 SOCKBUF_UNLOCK(&so->so_snd);
13126         }
13127
13128 skip_preblock:
13129         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13130                 goto out_unlocked;
13131         }
13132         /*
13133          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13134          * case NOTE: uio will be null when top/mbuf is passed
13135          */
13136         if (sndlen == 0) {
13137                 if (srcv->sinfo_flags & SCTP_EOF) {
13138                         got_all_of_the_send = 1;
13139                         goto dataless_eof;
13140                 } else {
13141                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13142                         error = EINVAL;
13143                         goto out;
13144                 }
13145         }
13146         if (top == NULL) {
13147                 struct sctp_stream_queue_pending *sp;
13148                 struct sctp_stream_out *strm;
13149                 uint32_t sndout;
13150
13151                 SCTP_TCB_SEND_LOCK(stcb);
13152                 if ((asoc->stream_locked) &&
13153                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13154                         SCTP_TCB_SEND_UNLOCK(stcb);
13155                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13156                         error = EINVAL;
13157                         goto out;
13158                 }
13159                 SCTP_TCB_SEND_UNLOCK(stcb);
13160
13161                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13162                 if (strm->last_msg_incomplete == 0) {
13163         do_a_copy_in:
13164                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13165                         if (error) {
13166                                 goto out;
13167                         }
13168                         SCTP_TCB_SEND_LOCK(stcb);
13169                         if (sp->msg_is_complete) {
13170                                 strm->last_msg_incomplete = 0;
13171                                 asoc->stream_locked = 0;
13172                         } else {
13173                                 /*
13174                                  * Just got locked to this guy in case of an
13175                                  * interrupt.
13176                                  */
13177                                 strm->last_msg_incomplete = 1;
13178                                 if (stcb->asoc.idata_supported == 0) {
13179                                         asoc->stream_locked = 1;
13180                                         asoc->stream_locked_on = srcv->sinfo_stream;
13181                                 }
13182                                 sp->sender_all_done = 0;
13183                         }
13184                         sctp_snd_sb_alloc(stcb, sp->length);
13185                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13186                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13187                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13188                         }
13189                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13190                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13191                         SCTP_TCB_SEND_UNLOCK(stcb);
13192                 } else {
13193                         SCTP_TCB_SEND_LOCK(stcb);
13194                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13195                         SCTP_TCB_SEND_UNLOCK(stcb);
13196                         if (sp == NULL) {
13197                                 /* ???? Huh ??? last msg is gone */
13198 #ifdef INVARIANTS
13199                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13200 #else
13201                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13202                                 strm->last_msg_incomplete = 0;
13203 #endif
13204                                 goto do_a_copy_in;
13205
13206                         }
13207                 }
13208                 while (uio->uio_resid > 0) {
13209                         /* How much room do we have? */
13210                         struct mbuf *new_tail, *mm;
13211
13212                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13213                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13214                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13215                         else
13216                                 max_len = 0;
13217
13218                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13219                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13220                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13221                                 sndout = 0;
13222                                 new_tail = NULL;
13223                                 if (hold_tcblock) {
13224                                         SCTP_TCB_UNLOCK(stcb);
13225                                         hold_tcblock = 0;
13226                                 }
13227                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13228                                 if ((mm == NULL) || error) {
13229                                         if (mm) {
13230                                                 sctp_m_freem(mm);
13231                                         }
13232                                         goto out;
13233                                 }
13234                                 /* Update the mbuf and count */
13235                                 SCTP_TCB_SEND_LOCK(stcb);
13236                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13237                                         /*
13238                                          * we need to get out. Peer probably
13239                                          * aborted.
13240                                          */
13241                                         sctp_m_freem(mm);
13242                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13243                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13244                                                 error = ECONNRESET;
13245                                         }
13246                                         SCTP_TCB_SEND_UNLOCK(stcb);
13247                                         goto out;
13248                                 }
13249                                 if (sp->tail_mbuf) {
13250                                         /* tack it to the end */
13251                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13252                                         sp->tail_mbuf = new_tail;
13253                                 } else {
13254                                         /* A stolen mbuf */
13255                                         sp->data = mm;
13256                                         sp->tail_mbuf = new_tail;
13257                                 }
13258                                 sctp_snd_sb_alloc(stcb, sndout);
13259                                 atomic_add_int(&sp->length, sndout);
13260                                 len += sndout;
13261                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13262                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13263                                 }
13264
13265                                 /* Did we reach EOR? */
13266                                 if ((uio->uio_resid == 0) &&
13267                                     ((user_marks_eor == 0) ||
13268                                     (srcv->sinfo_flags & SCTP_EOF) ||
13269                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13270                                         sp->msg_is_complete = 1;
13271                                 } else {
13272                                         sp->msg_is_complete = 0;
13273                                 }
13274                                 SCTP_TCB_SEND_UNLOCK(stcb);
13275                         }
13276                         if (uio->uio_resid == 0) {
13277                                 /* got it all? */
13278                                 continue;
13279                         }
13280                         /* PR-SCTP? */
13281                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13282                                 /*
13283                                  * This is ugly but we must assure locking
13284                                  * order
13285                                  */
13286                                 if (hold_tcblock == 0) {
13287                                         SCTP_TCB_LOCK(stcb);
13288                                         hold_tcblock = 1;
13289                                 }
13290                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13291                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13292                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13293                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13294                                 else
13295                                         max_len = 0;
13296                                 if (max_len > 0) {
13297                                         continue;
13298                                 }
13299                                 SCTP_TCB_UNLOCK(stcb);
13300                                 hold_tcblock = 0;
13301                         }
13302                         /* wait for space now */
13303                         if (non_blocking) {
13304                                 /* Non-blocking io in place out */
13305                                 goto skip_out_eof;
13306                         }
13307                         /* What about the INIT, send it maybe */
13308                         if (queue_only_for_init) {
13309                                 if (hold_tcblock == 0) {
13310                                         SCTP_TCB_LOCK(stcb);
13311                                         hold_tcblock = 1;
13312                                 }
13313                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13314                                         /* a collision took us forward? */
13315                                         queue_only = 0;
13316                                 } else {
13317                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13318                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13319                                         queue_only = 1;
13320                                 }
13321                         }
13322                         if ((net->flight_size > net->cwnd) &&
13323                             (asoc->sctp_cmt_on_off == 0)) {
13324                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13325                                 queue_only = 1;
13326                         } else if (asoc->ifp_had_enobuf) {
13327                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13328                                 if (net->flight_size > (2 * net->mtu)) {
13329                                         queue_only = 1;
13330                                 }
13331                                 asoc->ifp_had_enobuf = 0;
13332                         }
13333                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13334                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13335                             (stcb->asoc.total_flight > 0) &&
13336                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13337                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13338
13339                                 /*-
13340                                  * Ok, Nagle is set on and we have data outstanding.
13341                                  * Don't send anything and let SACKs drive out the
13342                                  * data unless we have a "full" segment to send.
13343                                  */
13344                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13345                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13346                                 }
13347                                 SCTP_STAT_INCR(sctps_naglequeued);
13348                                 nagle_applies = 1;
13349                         } else {
13350                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13351                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13352                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13353                                 }
13354                                 SCTP_STAT_INCR(sctps_naglesent);
13355                                 nagle_applies = 0;
13356                         }
13357                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13358
13359                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13360                                     nagle_applies, un_sent);
13361                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13362                                     stcb->asoc.total_flight,
13363                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13364                         }
13365                         if (queue_only_for_init)
13366                                 queue_only_for_init = 0;
13367                         if ((queue_only == 0) && (nagle_applies == 0)) {
13368                                 /*-
13369                                  * need to start chunk output
13370                                  * before blocking.. note that if
13371                                  * a lock is already applied, then
13372                                  * the input via the net is happening
13373                                  * and I don't need to start output :-D
13374                                  */
13375                                 if (hold_tcblock == 0) {
13376                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13377                                                 hold_tcblock = 1;
13378                                                 sctp_chunk_output(inp,
13379                                                     stcb,
13380                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13381                                         }
13382                                 } else {
13383                                         sctp_chunk_output(inp,
13384                                             stcb,
13385                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13386                                 }
13387                                 if (hold_tcblock == 1) {
13388                                         SCTP_TCB_UNLOCK(stcb);
13389                                         hold_tcblock = 0;
13390                                 }
13391                         }
13392                         SOCKBUF_LOCK(&so->so_snd);
13393                         /*-
13394                          * This is a bit strange, but I think it will
13395                          * work. The total_output_queue_size is locked and
13396                          * protected by the TCB_LOCK, which we just released.
13397                          * There is a race that can occur between releasing it
13398                          * above, and me getting the socket lock, where sacks
13399                          * come in but we have not put the SB_WAIT on the
13400                          * so_snd buffer to get the wakeup. After the LOCK
13401                          * is applied the sack_processing will also need to
13402                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13403                          * once we have the socket buffer lock if we recheck the
13404                          * size we KNOW we will get to sleep safely with the
13405                          * wakeup flag in place.
13406                          */
13407                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13408                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13409                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13410                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13411                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13412                                             asoc, (size_t)uio->uio_resid);
13413                                 }
13414                                 be.error = 0;
13415                                 stcb->block_entry = &be;
13416                                 error = sbwait(&so->so_snd);
13417                                 stcb->block_entry = NULL;
13418
13419                                 if (error || so->so_error || be.error) {
13420                                         if (error == 0) {
13421                                                 if (so->so_error)
13422                                                         error = so->so_error;
13423                                                 if (be.error) {
13424                                                         error = be.error;
13425                                                 }
13426                                         }
13427                                         SOCKBUF_UNLOCK(&so->so_snd);
13428                                         goto out_unlocked;
13429                                 }
13430
13431                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13432                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13433                                             asoc, stcb->asoc.total_output_queue_size);
13434                                 }
13435                         }
13436                         SOCKBUF_UNLOCK(&so->so_snd);
13437                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13438                                 goto out_unlocked;
13439                         }
13440                 }
13441                 SCTP_TCB_SEND_LOCK(stcb);
13442                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13443                         SCTP_TCB_SEND_UNLOCK(stcb);
13444                         goto out_unlocked;
13445                 }
13446                 if (sp) {
13447                         if (sp->msg_is_complete == 0) {
13448                                 strm->last_msg_incomplete = 1;
13449                                 if (stcb->asoc.idata_supported == 0) {
13450                                         asoc->stream_locked = 1;
13451                                         asoc->stream_locked_on = srcv->sinfo_stream;
13452                                 }
13453                         } else {
13454                                 sp->sender_all_done = 1;
13455                                 strm->last_msg_incomplete = 0;
13456                                 asoc->stream_locked = 0;
13457                         }
13458                 } else {
13459                         SCTP_PRINTF("Huh no sp TSNH?\n");
13460                         strm->last_msg_incomplete = 0;
13461                         asoc->stream_locked = 0;
13462                 }
13463                 SCTP_TCB_SEND_UNLOCK(stcb);
13464                 if (uio->uio_resid == 0) {
13465                         got_all_of_the_send = 1;
13466                 }
13467         } else {
13468                 /* We send in a 0, since we do NOT have any locks */
13469                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13470                 top = NULL;
13471                 if (srcv->sinfo_flags & SCTP_EOF) {
13472                         /*
13473                          * This should only happen for Panda for the mbuf
13474                          * send case, which does NOT yet support EEOR mode.
13475                          * Thus, we can just set this flag to do the proper
13476                          * EOF handling.
13477                          */
13478                         got_all_of_the_send = 1;
13479                 }
13480         }
13481         if (error) {
13482                 goto out;
13483         }
13484 dataless_eof:
13485         /* EOF thing ? */
13486         if ((srcv->sinfo_flags & SCTP_EOF) &&
13487             (got_all_of_the_send == 1)) {
13488                 SCTP_STAT_INCR(sctps_sends_with_eof);
13489                 error = 0;
13490                 if (hold_tcblock == 0) {
13491                         SCTP_TCB_LOCK(stcb);
13492                         hold_tcblock = 1;
13493                 }
13494                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13495                     TAILQ_EMPTY(&asoc->sent_queue) &&
13496                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13497                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13498                                 goto abort_anyway;
13499                         }
13500                         /* there is nothing queued to send, so I'm done... */
13501                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13502                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13503                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13504                                 struct sctp_nets *netp;
13505
13506                                 /* only send SHUTDOWN the first time through */
13507                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13508                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13509                                 }
13510                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13511                                 sctp_stop_timers_for_shutdown(stcb);
13512                                 if (stcb->asoc.alternate) {
13513                                         netp = stcb->asoc.alternate;
13514                                 } else {
13515                                         netp = stcb->asoc.primary_destination;
13516                                 }
13517                                 sctp_send_shutdown(stcb, netp);
13518                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13519                                     netp);
13520                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13521                                     asoc->primary_destination);
13522                         }
13523                 } else {
13524                         /*-
13525                          * we still got (or just got) data to send, so set
13526                          * SHUTDOWN_PENDING
13527                          */
13528                         /*-
13529                          * XXX sockets draft says that SCTP_EOF should be
13530                          * sent with no data.  currently, we will allow user
13531                          * data to be sent first and move to
13532                          * SHUTDOWN-PENDING
13533                          */
13534                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13535                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13536                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13537                                 if (hold_tcblock == 0) {
13538                                         SCTP_TCB_LOCK(stcb);
13539                                         hold_tcblock = 1;
13540                                 }
13541                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13542                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13543                                 }
13544                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13545                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13546                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13547                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13548                                         struct mbuf *op_err;
13549                                         char msg[SCTP_DIAG_INFO_LEN];
13550
13551                         abort_anyway:
13552                                         if (free_cnt_applied) {
13553                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13554                                                 free_cnt_applied = 0;
13555                                         }
13556                                         snprintf(msg, sizeof(msg),
13557                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13558                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13559                                             msg);
13560                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13561                                             op_err, SCTP_SO_LOCKED);
13562                                         /*
13563                                          * now relock the stcb so everything
13564                                          * is sane
13565                                          */
13566                                         hold_tcblock = 0;
13567                                         stcb = NULL;
13568                                         goto out;
13569                                 }
13570                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13571                                     asoc->primary_destination);
13572                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13573                         }
13574                 }
13575         }
13576 skip_out_eof:
13577         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13578                 some_on_control = 1;
13579         }
13580         if (queue_only_for_init) {
13581                 if (hold_tcblock == 0) {
13582                         SCTP_TCB_LOCK(stcb);
13583                         hold_tcblock = 1;
13584                 }
13585                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13586                         /* a collision took us forward? */
13587                         queue_only = 0;
13588                 } else {
13589                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13590                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13591                         queue_only = 1;
13592                 }
13593         }
13594         if ((net->flight_size > net->cwnd) &&
13595             (stcb->asoc.sctp_cmt_on_off == 0)) {
13596                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13597                 queue_only = 1;
13598         } else if (asoc->ifp_had_enobuf) {
13599                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13600                 if (net->flight_size > (2 * net->mtu)) {
13601                         queue_only = 1;
13602                 }
13603                 asoc->ifp_had_enobuf = 0;
13604         }
13605         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13606         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13607             (stcb->asoc.total_flight > 0) &&
13608             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13609             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13610                 /*-
13611                  * Ok, Nagle is set on and we have data outstanding.
13612                  * Don't send anything and let SACKs drive out the
13613                  * data unless wen have a "full" segment to send.
13614                  */
13615                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13616                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13617                 }
13618                 SCTP_STAT_INCR(sctps_naglequeued);
13619                 nagle_applies = 1;
13620         } else {
13621                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13622                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13623                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13624                 }
13625                 SCTP_STAT_INCR(sctps_naglesent);
13626                 nagle_applies = 0;
13627         }
13628         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13629                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13630                     nagle_applies, un_sent);
13631                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13632                     stcb->asoc.total_flight,
13633                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13634         }
13635         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13636                 /* we can attempt to send too. */
13637                 if (hold_tcblock == 0) {
13638                         /*
13639                          * If there is activity recv'ing sacks no need to
13640                          * send
13641                          */
13642                         if (SCTP_TCB_TRYLOCK(stcb)) {
13643                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13644                                 hold_tcblock = 1;
13645                         }
13646                 } else {
13647                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13648                 }
13649         } else if ((queue_only == 0) &&
13650                     (stcb->asoc.peers_rwnd == 0) &&
13651             (stcb->asoc.total_flight == 0)) {
13652                 /* We get to have a probe outstanding */
13653                 if (hold_tcblock == 0) {
13654                         hold_tcblock = 1;
13655                         SCTP_TCB_LOCK(stcb);
13656                 }
13657                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13658         } else if (some_on_control) {
13659                 int num_out, reason, frag_point;
13660
13661                 /* Here we do control only */
13662                 if (hold_tcblock == 0) {
13663                         hold_tcblock = 1;
13664                         SCTP_TCB_LOCK(stcb);
13665                 }
13666                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13667                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13668                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13669         }
13670         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13671             queue_only, stcb->asoc.peers_rwnd, un_sent,
13672             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13673             stcb->asoc.total_output_queue_size, error);
13674
13675 out:
13676 out_unlocked:
13677
13678         if (local_soresv && stcb) {
13679                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13680         }
13681         if (create_lock_applied) {
13682                 SCTP_ASOC_CREATE_UNLOCK(inp);
13683         }
13684         if ((stcb) && hold_tcblock) {
13685                 SCTP_TCB_UNLOCK(stcb);
13686         }
13687         if (stcb && free_cnt_applied) {
13688                 atomic_add_int(&stcb->asoc.refcnt, -1);
13689         }
13690 #ifdef INVARIANTS
13691         if (stcb) {
13692                 if (mtx_owned(&stcb->tcb_mtx)) {
13693                         panic("Leaving with tcb mtx owned?");
13694                 }
13695                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13696                         panic("Leaving with tcb send mtx owned?");
13697                 }
13698         }
13699 #endif
13700         if (top) {
13701                 sctp_m_freem(top);
13702         }
13703         if (control) {
13704                 sctp_m_freem(control);
13705         }
13706         return (error);
13707 }
13708
13709
13710 /*
13711  * generate an AUTHentication chunk, if required
13712  */
13713 struct mbuf *
13714 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13715     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13716     struct sctp_tcb *stcb, uint8_t chunk)
13717 {
13718         struct mbuf *m_auth;
13719         struct sctp_auth_chunk *auth;
13720         int chunk_len;
13721         struct mbuf *cn;
13722
13723         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13724             (stcb == NULL))
13725                 return (m);
13726
13727         if (stcb->asoc.auth_supported == 0) {
13728                 return (m);
13729         }
13730         /* does the requested chunk require auth? */
13731         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13732                 return (m);
13733         }
13734         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13735         if (m_auth == NULL) {
13736                 /* no mbuf's */
13737                 return (m);
13738         }
13739         /* reserve some space if this will be the first mbuf */
13740         if (m == NULL)
13741                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13742         /* fill in the AUTH chunk details */
13743         auth = mtod(m_auth, struct sctp_auth_chunk *);
13744         memset(auth, 0, sizeof(*auth));
13745         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13746         auth->ch.chunk_flags = 0;
13747         chunk_len = sizeof(*auth) +
13748             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13749         auth->ch.chunk_length = htons(chunk_len);
13750         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13751         /* key id and hmac digest will be computed and filled in upon send */
13752
13753         /* save the offset where the auth was inserted into the chain */
13754         *offset = 0;
13755         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13756                 *offset += SCTP_BUF_LEN(cn);
13757         }
13758
13759         /* update length and return pointer to the auth chunk */
13760         SCTP_BUF_LEN(m_auth) = chunk_len;
13761         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13762         if (auth_ret != NULL)
13763                 *auth_ret = auth;
13764
13765         return (m);
13766 }
13767
13768 #ifdef INET6
13769 int
13770 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13771 {
13772         struct nd_prefix *pfx = NULL;
13773         struct nd_pfxrouter *pfxrtr = NULL;
13774         struct sockaddr_in6 gw6;
13775
13776         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13777                 return (0);
13778
13779         /* get prefix entry of address */
13780         ND6_RLOCK();
13781         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13782                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13783                         continue;
13784                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13785                     &src6->sin6_addr, &pfx->ndpr_mask))
13786                         break;
13787         }
13788         /* no prefix entry in the prefix list */
13789         if (pfx == NULL) {
13790                 ND6_RUNLOCK();
13791                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13792                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13793                 return (0);
13794         }
13795
13796         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13797         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13798
13799         /* search installed gateway from prefix entry */
13800         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13801                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13802                 gw6.sin6_family = AF_INET6;
13803                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13804                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13805                     sizeof(struct in6_addr));
13806                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13807                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13808                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13809                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13810                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13811                         ND6_RUNLOCK();
13812                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13813                         return (1);
13814                 }
13815         }
13816         ND6_RUNLOCK();
13817         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13818         return (0);
13819 }
13820 #endif
13821
13822 int
13823 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13824 {
13825 #ifdef INET
13826         struct sockaddr_in *sin, *mask;
13827         struct ifaddr *ifa;
13828         struct in_addr srcnetaddr, gwnetaddr;
13829
13830         if (ro == NULL || ro->ro_rt == NULL ||
13831             sifa->address.sa.sa_family != AF_INET) {
13832                 return (0);
13833         }
13834         ifa = (struct ifaddr *)sifa->ifa;
13835         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13836         sin = &sifa->address.sin;
13837         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13838         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13839         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13840         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13841
13842         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13843         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13844         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13845         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13846         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13847         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13848                 return (1);
13849         }
13850 #endif
13851         return (0);
13852 }