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 static struct sctp_tcb *
3737 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3738     uint16_t port,
3739     struct mbuf *control,
3740     struct sctp_nets **net_p,
3741     int *error)
3742 {
3743         struct cmsghdr cmh;
3744         struct sctp_tcb *stcb;
3745         struct sockaddr *addr;
3746 #ifdef INET
3747         struct sockaddr_in sin;
3748 #endif
3749 #ifdef INET6
3750         struct sockaddr_in6 sin6;
3751 #endif
3752         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3753
3754         tot_len = SCTP_BUF_LEN(control);
3755         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3756                 rem_len = tot_len - off;
3757                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3758                         /* There is not enough room for one more. */
3759                         *error = EINVAL;
3760                         return (NULL);
3761                 }
3762                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3763                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3764                         /* We dont't have a complete CMSG header. */
3765                         *error = EINVAL;
3766                         return (NULL);
3767                 }
3768                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3769                         /* We don't have the complete CMSG. */
3770                         *error = EINVAL;
3771                         return (NULL);
3772                 }
3773                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3774                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3775                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3776                         switch (cmh.cmsg_type) {
3777 #ifdef INET
3778                         case SCTP_DSTADDRV4:
3779                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3784                                 sin.sin_family = AF_INET;
3785                                 sin.sin_len = sizeof(struct sockaddr_in);
3786                                 sin.sin_port = port;
3787                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3788                                 addr = (struct sockaddr *)&sin;
3789                                 break;
3790 #endif
3791 #ifdef INET6
3792                         case SCTP_DSTADDRV6:
3793                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3794                                         *error = EINVAL;
3795                                         return (NULL);
3796                                 }
3797                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3798                                 sin6.sin6_family = AF_INET6;
3799                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3800                                 sin6.sin6_port = port;
3801                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3802 #ifdef INET
3803                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3804                                         in6_sin6_2_sin(&sin, &sin6);
3805                                         addr = (struct sockaddr *)&sin;
3806                                 } else
3807 #endif
3808                                         addr = (struct sockaddr *)&sin6;
3809                                 break;
3810 #endif
3811                         default:
3812                                 addr = NULL;
3813                                 break;
3814                         }
3815                         if (addr) {
3816                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3817                                 if (stcb != NULL) {
3818                                         return (stcb);
3819                                 }
3820                         }
3821                 }
3822         }
3823         return (NULL);
3824 }
3825
3826 static struct mbuf *
3827 sctp_add_cookie(struct mbuf *init, int init_offset,
3828     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3829 {
3830         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3831         struct sctp_state_cookie *stc;
3832         struct sctp_paramhdr *ph;
3833         uint8_t *foo;
3834         int sig_offset;
3835         uint16_t cookie_sz;
3836
3837         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3838             sizeof(struct sctp_paramhdr)), 0,
3839             M_NOWAIT, 1, MT_DATA);
3840         if (mret == NULL) {
3841                 return (NULL);
3842         }
3843         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3844         if (copy_init == NULL) {
3845                 sctp_m_freem(mret);
3846                 return (NULL);
3847         }
3848 #ifdef SCTP_MBUF_LOGGING
3849         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3850                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3851         }
3852 #endif
3853         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3854             M_NOWAIT);
3855         if (copy_initack == NULL) {
3856                 sctp_m_freem(mret);
3857                 sctp_m_freem(copy_init);
3858                 return (NULL);
3859         }
3860 #ifdef SCTP_MBUF_LOGGING
3861         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3862                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3863         }
3864 #endif
3865         /* easy side we just drop it on the end */
3866         ph = mtod(mret, struct sctp_paramhdr *);
3867         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3868             sizeof(struct sctp_paramhdr);
3869         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3870             sizeof(struct sctp_paramhdr));
3871         ph->param_type = htons(SCTP_STATE_COOKIE);
3872         ph->param_length = 0;   /* fill in at the end */
3873         /* Fill in the stc cookie data */
3874         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3875
3876         /* tack the INIT and then the INIT-ACK onto the chain */
3877         cookie_sz = 0;
3878         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3879                 cookie_sz += SCTP_BUF_LEN(m_at);
3880                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3881                         SCTP_BUF_NEXT(m_at) = copy_init;
3882                         break;
3883                 }
3884         }
3885         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3886                 cookie_sz += SCTP_BUF_LEN(m_at);
3887                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3888                         SCTP_BUF_NEXT(m_at) = copy_initack;
3889                         break;
3890                 }
3891         }
3892         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3893                 cookie_sz += SCTP_BUF_LEN(m_at);
3894                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3895                         break;
3896                 }
3897         }
3898         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3899         if (sig == NULL) {
3900                 /* no space, so free the entire chain */
3901                 sctp_m_freem(mret);
3902                 return (NULL);
3903         }
3904         SCTP_BUF_LEN(sig) = 0;
3905         SCTP_BUF_NEXT(m_at) = sig;
3906         sig_offset = 0;
3907         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3908         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3909         *signature = foo;
3910         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3911         cookie_sz += SCTP_SIGNATURE_SIZE;
3912         ph->param_length = htons(cookie_sz);
3913         return (mret);
3914 }
3915
3916
3917 static uint8_t
3918 sctp_get_ect(struct sctp_tcb *stcb)
3919 {
3920         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3921                 return (SCTP_ECT0_BIT);
3922         } else {
3923                 return (0);
3924         }
3925 }
3926
3927 #if defined(INET) || defined(INET6)
3928 static void
3929 sctp_handle_no_route(struct sctp_tcb *stcb,
3930     struct sctp_nets *net,
3931     int so_locked)
3932 {
3933         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3934
3935         if (net) {
3936                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3937                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3938                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3939                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3941                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3942                                     stcb, 0,
3943                                     (void *)net,
3944                                     so_locked);
3945                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3946                                 net->dest_state &= ~SCTP_ADDR_PF;
3947                         }
3948                 }
3949                 if (stcb) {
3950                         if (net == stcb->asoc.primary_destination) {
3951                                 /* need a new primary */
3952                                 struct sctp_nets *alt;
3953
3954                                 alt = sctp_find_alternate_net(stcb, net, 0);
3955                                 if (alt != net) {
3956                                         if (stcb->asoc.alternate) {
3957                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3958                                         }
3959                                         stcb->asoc.alternate = alt;
3960                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3961                                         if (net->ro._s_addr) {
3962                                                 sctp_free_ifa(net->ro._s_addr);
3963                                                 net->ro._s_addr = NULL;
3964                                         }
3965                                         net->src_addr_selected = 0;
3966                                 }
3967                         }
3968                 }
3969         }
3970 }
3971 #endif
3972
3973 static int
3974 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3975     struct sctp_tcb *stcb,      /* may be NULL */
3976     struct sctp_nets *net,
3977     struct sockaddr *to,
3978     struct mbuf *m,
3979     uint32_t auth_offset,
3980     struct sctp_auth_chunk *auth,
3981     uint16_t auth_keyid,
3982     int nofragment_flag,
3983     int ecn_ok,
3984     int out_of_asoc_ok,
3985     uint16_t src_port,
3986     uint16_t dest_port,
3987     uint32_t v_tag,
3988     uint16_t port,
3989     union sctp_sockstore *over_addr,
3990     uint8_t mflowtype, uint32_t mflowid,
3991 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3992     int so_locked SCTP_UNUSED
3993 #else
3994     int so_locked
3995 #endif
3996 )
3997 {
3998 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3999         /**
4000          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4001          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4002          * - fill in the HMAC digest of any AUTH chunk in the packet.
4003          * - calculate and fill in the SCTP checksum.
4004          * - prepend an IP address header.
4005          * - if boundall use INADDR_ANY.
4006          * - if boundspecific do source address selection.
4007          * - set fragmentation option for ipV4.
4008          * - On return from IP output, check/adjust mtu size of output
4009          *   interface and smallest_mtu size as well.
4010          */
4011         /* Will need ifdefs around this */
4012         struct mbuf *newm;
4013         struct sctphdr *sctphdr;
4014         int packet_length;
4015         int ret;
4016 #if defined(INET) || defined(INET6)
4017         uint32_t vrf_id;
4018 #endif
4019 #if defined(INET) || defined(INET6)
4020         struct mbuf *o_pak;
4021         sctp_route_t *ro = NULL;
4022         struct udphdr *udp = NULL;
4023 #endif
4024         uint8_t tos_value;
4025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4026         struct socket *so = NULL;
4027 #endif
4028
4029         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4030                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4031                 sctp_m_freem(m);
4032                 return (EFAULT);
4033         }
4034 #if defined(INET) || defined(INET6)
4035         if (stcb) {
4036                 vrf_id = stcb->asoc.vrf_id;
4037         } else {
4038                 vrf_id = inp->def_vrf_id;
4039         }
4040 #endif
4041         /* fill in the HMAC digest for any AUTH chunk in the packet */
4042         if ((auth != NULL) && (stcb != NULL)) {
4043                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4044         }
4045
4046         if (net) {
4047                 tos_value = net->dscp;
4048         } else if (stcb) {
4049                 tos_value = stcb->asoc.default_dscp;
4050         } else {
4051                 tos_value = inp->sctp_ep.default_dscp;
4052         }
4053
4054         switch (to->sa_family) {
4055 #ifdef INET
4056         case AF_INET:
4057                 {
4058                         struct ip *ip = NULL;
4059                         sctp_route_t iproute;
4060                         int len;
4061
4062                         len = SCTP_MIN_V4_OVERHEAD;
4063                         if (port) {
4064                                 len += sizeof(struct udphdr);
4065                         }
4066                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4067                         if (newm == NULL) {
4068                                 sctp_m_freem(m);
4069                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4070                                 return (ENOMEM);
4071                         }
4072                         SCTP_ALIGN_TO_END(newm, len);
4073                         SCTP_BUF_LEN(newm) = len;
4074                         SCTP_BUF_NEXT(newm) = m;
4075                         m = newm;
4076                         if (net != NULL) {
4077                                 m->m_pkthdr.flowid = net->flowid;
4078                                 M_HASHTYPE_SET(m, net->flowtype);
4079                         } else {
4080                                 m->m_pkthdr.flowid = mflowid;
4081                                 M_HASHTYPE_SET(m, mflowtype);
4082                         }
4083                         packet_length = sctp_calculate_len(m);
4084                         ip = mtod(m, struct ip *);
4085                         ip->ip_v = IPVERSION;
4086                         ip->ip_hl = (sizeof(struct ip) >> 2);
4087                         if (tos_value == 0) {
4088                                 /*
4089                                  * This means especially, that it is not set
4090                                  * at the SCTP layer. So use the value from
4091                                  * the IP layer.
4092                                  */
4093                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4094                         }
4095                         tos_value &= 0xfc;
4096                         if (ecn_ok) {
4097                                 tos_value |= sctp_get_ect(stcb);
4098                         }
4099                         if ((nofragment_flag) && (port == 0)) {
4100                                 ip->ip_off = htons(IP_DF);
4101                         } else {
4102                                 ip->ip_off = htons(0);
4103                         }
4104                         /* FreeBSD has a function for ip_id's */
4105                         ip_fillid(ip);
4106
4107                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4108                         ip->ip_len = htons(packet_length);
4109                         ip->ip_tos = tos_value;
4110                         if (port) {
4111                                 ip->ip_p = IPPROTO_UDP;
4112                         } else {
4113                                 ip->ip_p = IPPROTO_SCTP;
4114                         }
4115                         ip->ip_sum = 0;
4116                         if (net == NULL) {
4117                                 ro = &iproute;
4118                                 memset(&iproute, 0, sizeof(iproute));
4119                                 memcpy(&ro->ro_dst, to, to->sa_len);
4120                         } else {
4121                                 ro = (sctp_route_t *)&net->ro;
4122                         }
4123                         /* Now the address selection part */
4124                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4125
4126                         /* call the routine to select the src address */
4127                         if (net && out_of_asoc_ok == 0) {
4128                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4129                                         sctp_free_ifa(net->ro._s_addr);
4130                                         net->ro._s_addr = NULL;
4131                                         net->src_addr_selected = 0;
4132                                         if (ro->ro_rt) {
4133                                                 RTFREE(ro->ro_rt);
4134                                                 ro->ro_rt = NULL;
4135                                         }
4136                                 }
4137                                 if (net->src_addr_selected == 0) {
4138                                         /* Cache the source address */
4139                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4140                                             ro, net, 0,
4141                                             vrf_id);
4142                                         net->src_addr_selected = 1;
4143                                 }
4144                                 if (net->ro._s_addr == NULL) {
4145                                         /* No route to host */
4146                                         net->src_addr_selected = 0;
4147                                         sctp_handle_no_route(stcb, net, so_locked);
4148                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4149                                         sctp_m_freem(m);
4150                                         return (EHOSTUNREACH);
4151                                 }
4152                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4153                         } else {
4154                                 if (over_addr == NULL) {
4155                                         struct sctp_ifa *_lsrc;
4156
4157                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4158                                             net,
4159                                             out_of_asoc_ok,
4160                                             vrf_id);
4161                                         if (_lsrc == NULL) {
4162                                                 sctp_handle_no_route(stcb, net, so_locked);
4163                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164                                                 sctp_m_freem(m);
4165                                                 return (EHOSTUNREACH);
4166                                         }
4167                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4168                                         sctp_free_ifa(_lsrc);
4169                                 } else {
4170                                         ip->ip_src = over_addr->sin.sin_addr;
4171                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4172                                 }
4173                         }
4174                         if (port) {
4175                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4176                                         sctp_handle_no_route(stcb, net, so_locked);
4177                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4178                                         sctp_m_freem(m);
4179                                         return (EHOSTUNREACH);
4180                                 }
4181                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4182                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4183                                 udp->uh_dport = port;
4184                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4185                                 if (V_udp_cksum) {
4186                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4187                                 } else {
4188                                         udp->uh_sum = 0;
4189                                 }
4190                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4191                         } else {
4192                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4193                         }
4194
4195                         sctphdr->src_port = src_port;
4196                         sctphdr->dest_port = dest_port;
4197                         sctphdr->v_tag = v_tag;
4198                         sctphdr->checksum = 0;
4199
4200                         /*
4201                          * If source address selection fails and we find no
4202                          * route then the ip_output should fail as well with
4203                          * a NO_ROUTE_TO_HOST type error. We probably should
4204                          * catch that somewhere and abort the association
4205                          * right away (assuming this is an INIT being sent).
4206                          */
4207                         if (ro->ro_rt == NULL) {
4208                                 /*
4209                                  * src addr selection failed to find a route
4210                                  * (or valid source addr), so we can't get
4211                                  * there from here (yet)!
4212                                  */
4213                                 sctp_handle_no_route(stcb, net, so_locked);
4214                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4215                                 sctp_m_freem(m);
4216                                 return (EHOSTUNREACH);
4217                         }
4218                         if (ro != &iproute) {
4219                                 memcpy(&iproute, ro, sizeof(*ro));
4220                         }
4221                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4222                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4224                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4225                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4226                             (void *)ro->ro_rt);
4227
4228                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4229                                 /* failed to prepend data, give up */
4230                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4231                                 sctp_m_freem(m);
4232                                 return (ENOMEM);
4233                         }
4234                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4235                         if (port) {
4236                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4237                                 SCTP_STAT_INCR(sctps_sendswcrc);
4238                                 if (V_udp_cksum) {
4239                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4240                                 }
4241                         } else {
4242                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4243                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4244                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4245                         }
4246 #ifdef SCTP_PACKET_LOGGING
4247                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4248                                 sctp_packet_log(o_pak);
4249 #endif
4250                         /* send it out.  table id is taken from stcb */
4251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4252                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4253                                 so = SCTP_INP_SO(inp);
4254                                 SCTP_SOCKET_UNLOCK(so, 0);
4255                         }
4256 #endif
4257                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4258                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4259 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4260                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4261                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4262                                 SCTP_TCB_UNLOCK(stcb);
4263                                 SCTP_SOCKET_LOCK(so, 0);
4264                                 SCTP_TCB_LOCK(stcb);
4265                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4266                         }
4267 #endif
4268                         if (port) {
4269                                 UDPSTAT_INC(udps_opackets);
4270                         }
4271                         SCTP_STAT_INCR(sctps_sendpackets);
4272                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4273                         if (ret)
4274                                 SCTP_STAT_INCR(sctps_senderrors);
4275
4276                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4277                         if (net == NULL) {
4278                                 /* free tempy routes */
4279                                 RO_RTFREE(ro);
4280                         } else {
4281                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4282                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4283                                         uint32_t mtu;
4284
4285                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4286                                         if (mtu > 0) {
4287                                                 if (net->port) {
4288                                                         mtu -= sizeof(struct udphdr);
4289                                                 }
4290                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4291                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4292                                                 }
4293                                                 net->mtu = mtu;
4294                                         }
4295                                 } else if (ro->ro_rt == NULL) {
4296                                         /* route was freed */
4297                                         if (net->ro._s_addr &&
4298                                             net->src_addr_selected) {
4299                                                 sctp_free_ifa(net->ro._s_addr);
4300                                                 net->ro._s_addr = NULL;
4301                                         }
4302                                         net->src_addr_selected = 0;
4303                                 }
4304                         }
4305                         return (ret);
4306                 }
4307 #endif
4308 #ifdef INET6
4309         case AF_INET6:
4310                 {
4311                         uint32_t flowlabel, flowinfo;
4312                         struct ip6_hdr *ip6h;
4313                         struct route_in6 ip6route;
4314                         struct ifnet *ifp;
4315                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4316                         int prev_scope = 0;
4317                         struct sockaddr_in6 lsa6_storage;
4318                         int error;
4319                         u_short prev_port = 0;
4320                         int len;
4321
4322                         if (net) {
4323                                 flowlabel = net->flowlabel;
4324                         } else if (stcb) {
4325                                 flowlabel = stcb->asoc.default_flowlabel;
4326                         } else {
4327                                 flowlabel = inp->sctp_ep.default_flowlabel;
4328                         }
4329                         if (flowlabel == 0) {
4330                                 /*
4331                                  * This means especially, that it is not set
4332                                  * at the SCTP layer. So use the value from
4333                                  * the IP layer.
4334                                  */
4335                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4336                         }
4337                         flowlabel &= 0x000fffff;
4338                         len = SCTP_MIN_OVERHEAD;
4339                         if (port) {
4340                                 len += sizeof(struct udphdr);
4341                         }
4342                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4343                         if (newm == NULL) {
4344                                 sctp_m_freem(m);
4345                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4346                                 return (ENOMEM);
4347                         }
4348                         SCTP_ALIGN_TO_END(newm, len);
4349                         SCTP_BUF_LEN(newm) = len;
4350                         SCTP_BUF_NEXT(newm) = m;
4351                         m = newm;
4352                         if (net != NULL) {
4353                                 m->m_pkthdr.flowid = net->flowid;
4354                                 M_HASHTYPE_SET(m, net->flowtype);
4355                         } else {
4356                                 m->m_pkthdr.flowid = mflowid;
4357                                 M_HASHTYPE_SET(m, mflowtype);
4358                         }
4359                         packet_length = sctp_calculate_len(m);
4360
4361                         ip6h = mtod(m, struct ip6_hdr *);
4362                         /* protect *sin6 from overwrite */
4363                         sin6 = (struct sockaddr_in6 *)to;
4364                         tmp = *sin6;
4365                         sin6 = &tmp;
4366
4367                         /* KAME hack: embed scopeid */
4368                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4369                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4370                                 sctp_m_freem(m);
4371                                 return (EINVAL);
4372                         }
4373                         if (net == NULL) {
4374                                 memset(&ip6route, 0, sizeof(ip6route));
4375                                 ro = (sctp_route_t *)&ip6route;
4376                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4377                         } else {
4378                                 ro = (sctp_route_t *)&net->ro;
4379                         }
4380                         /*
4381                          * We assume here that inp_flow is in host byte
4382                          * order within the TCB!
4383                          */
4384                         if (tos_value == 0) {
4385                                 /*
4386                                  * This means especially, that it is not set
4387                                  * at the SCTP layer. So use the value from
4388                                  * the IP layer.
4389                                  */
4390                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4391                         }
4392                         tos_value &= 0xfc;
4393                         if (ecn_ok) {
4394                                 tos_value |= sctp_get_ect(stcb);
4395                         }
4396                         flowinfo = 0x06;
4397                         flowinfo <<= 8;
4398                         flowinfo |= tos_value;
4399                         flowinfo <<= 20;
4400                         flowinfo |= flowlabel;
4401                         ip6h->ip6_flow = htonl(flowinfo);
4402                         if (port) {
4403                                 ip6h->ip6_nxt = IPPROTO_UDP;
4404                         } else {
4405                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4406                         }
4407                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4408                         ip6h->ip6_dst = sin6->sin6_addr;
4409
4410                         /*
4411                          * Add SRC address selection here: we can only reuse
4412                          * to a limited degree the kame src-addr-sel, since
4413                          * we can try their selection but it may not be
4414                          * bound.
4415                          */
4416                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4417                         lsa6_tmp.sin6_family = AF_INET6;
4418                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4419                         lsa6 = &lsa6_tmp;
4420                         if (net && out_of_asoc_ok == 0) {
4421                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4422                                         sctp_free_ifa(net->ro._s_addr);
4423                                         net->ro._s_addr = NULL;
4424                                         net->src_addr_selected = 0;
4425                                         if (ro->ro_rt) {
4426                                                 RTFREE(ro->ro_rt);
4427                                                 ro->ro_rt = NULL;
4428                                         }
4429                                 }
4430                                 if (net->src_addr_selected == 0) {
4431                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4432                                         /* KAME hack: embed scopeid */
4433                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4434                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4435                                                 sctp_m_freem(m);
4436                                                 return (EINVAL);
4437                                         }
4438                                         /* Cache the source address */
4439                                         net->ro._s_addr = sctp_source_address_selection(inp,
4440                                             stcb,
4441                                             ro,
4442                                             net,
4443                                             0,
4444                                             vrf_id);
4445                                         (void)sa6_recoverscope(sin6);
4446                                         net->src_addr_selected = 1;
4447                                 }
4448                                 if (net->ro._s_addr == NULL) {
4449                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4450                                         net->src_addr_selected = 0;
4451                                         sctp_handle_no_route(stcb, net, so_locked);
4452                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4453                                         sctp_m_freem(m);
4454                                         return (EHOSTUNREACH);
4455                                 }
4456                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4457                         } else {
4458                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4459                                 /* KAME hack: embed scopeid */
4460                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4461                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4462                                         sctp_m_freem(m);
4463                                         return (EINVAL);
4464                                 }
4465                                 if (over_addr == NULL) {
4466                                         struct sctp_ifa *_lsrc;
4467
4468                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4469                                             net,
4470                                             out_of_asoc_ok,
4471                                             vrf_id);
4472                                         if (_lsrc == NULL) {
4473                                                 sctp_handle_no_route(stcb, net, so_locked);
4474                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4475                                                 sctp_m_freem(m);
4476                                                 return (EHOSTUNREACH);
4477                                         }
4478                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4479                                         sctp_free_ifa(_lsrc);
4480                                 } else {
4481                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4482                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4483                                 }
4484                                 (void)sa6_recoverscope(sin6);
4485                         }
4486                         lsa6->sin6_port = inp->sctp_lport;
4487
4488                         if (ro->ro_rt == NULL) {
4489                                 /*
4490                                  * src addr selection failed to find a route
4491                                  * (or valid source addr), so we can't get
4492                                  * there from here!
4493                                  */
4494                                 sctp_handle_no_route(stcb, net, so_locked);
4495                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4496                                 sctp_m_freem(m);
4497                                 return (EHOSTUNREACH);
4498                         }
4499                         /*
4500                          * XXX: sa6 may not have a valid sin6_scope_id in
4501                          * the non-SCOPEDROUTING case.
4502                          */
4503                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4504                         lsa6_storage.sin6_family = AF_INET6;
4505                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4506                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4507                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4508                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4509                                 sctp_m_freem(m);
4510                                 return (error);
4511                         }
4512                         /* XXX */
4513                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4514                         lsa6_storage.sin6_port = inp->sctp_lport;
4515                         lsa6 = &lsa6_storage;
4516                         ip6h->ip6_src = lsa6->sin6_addr;
4517
4518                         if (port) {
4519                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4520                                         sctp_handle_no_route(stcb, net, so_locked);
4521                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4522                                         sctp_m_freem(m);
4523                                         return (EHOSTUNREACH);
4524                                 }
4525                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4526                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4527                                 udp->uh_dport = port;
4528                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4529                                 udp->uh_sum = 0;
4530                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4531                         } else {
4532                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4533                         }
4534
4535                         sctphdr->src_port = src_port;
4536                         sctphdr->dest_port = dest_port;
4537                         sctphdr->v_tag = v_tag;
4538                         sctphdr->checksum = 0;
4539
4540                         /*
4541                          * We set the hop limit now since there is a good
4542                          * chance that our ro pointer is now filled
4543                          */
4544                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4545                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4546
4547 #ifdef SCTP_DEBUG
4548                         /* Copy to be sure something bad is not happening */
4549                         sin6->sin6_addr = ip6h->ip6_dst;
4550                         lsa6->sin6_addr = ip6h->ip6_src;
4551 #endif
4552
4553                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4554                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4555                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4556                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4557                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4558                         if (net) {
4559                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4560                                 /*
4561                                  * preserve the port and scope for link
4562                                  * local send
4563                                  */
4564                                 prev_scope = sin6->sin6_scope_id;
4565                                 prev_port = sin6->sin6_port;
4566                         }
4567
4568                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4569                                 /* failed to prepend data, give up */
4570                                 sctp_m_freem(m);
4571                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4572                                 return (ENOMEM);
4573                         }
4574                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4575                         if (port) {
4576                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4577                                 SCTP_STAT_INCR(sctps_sendswcrc);
4578                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4579                                         udp->uh_sum = 0xffff;
4580                                 }
4581                         } else {
4582                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4583                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4584                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4585                         }
4586                         /* send it out. table id is taken from stcb */
4587 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4588                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4589                                 so = SCTP_INP_SO(inp);
4590                                 SCTP_SOCKET_UNLOCK(so, 0);
4591                         }
4592 #endif
4593 #ifdef SCTP_PACKET_LOGGING
4594                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4595                                 sctp_packet_log(o_pak);
4596 #endif
4597                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4598                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4599 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4600                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4601                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4602                                 SCTP_TCB_UNLOCK(stcb);
4603                                 SCTP_SOCKET_LOCK(so, 0);
4604                                 SCTP_TCB_LOCK(stcb);
4605                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4606                         }
4607 #endif
4608                         if (net) {
4609                                 /* for link local this must be done */
4610                                 sin6->sin6_scope_id = prev_scope;
4611                                 sin6->sin6_port = prev_port;
4612                         }
4613                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4614                         if (port) {
4615                                 UDPSTAT_INC(udps_opackets);
4616                         }
4617                         SCTP_STAT_INCR(sctps_sendpackets);
4618                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4619                         if (ret) {
4620                                 SCTP_STAT_INCR(sctps_senderrors);
4621                         }
4622                         if (net == NULL) {
4623                                 /* Now if we had a temp route free it */
4624                                 RO_RTFREE(ro);
4625                         } else {
4626                                 /*
4627                                  * PMTU check versus smallest asoc MTU goes
4628                                  * here
4629                                  */
4630                                 if (ro->ro_rt == NULL) {
4631                                         /* Route was freed */
4632                                         if (net->ro._s_addr &&
4633                                             net->src_addr_selected) {
4634                                                 sctp_free_ifa(net->ro._s_addr);
4635                                                 net->ro._s_addr = NULL;
4636                                         }
4637                                         net->src_addr_selected = 0;
4638                                 }
4639                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4640                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4641                                         uint32_t mtu;
4642
4643                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4644                                         if (mtu > 0) {
4645                                                 if (net->port) {
4646                                                         mtu -= sizeof(struct udphdr);
4647                                                 }
4648                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4649                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4650                                                 }
4651                                                 net->mtu = mtu;
4652                                         }
4653                                 } else if (ifp) {
4654                                         if (ND_IFINFO(ifp)->linkmtu &&
4655                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4656                                                 sctp_mtu_size_reset(inp,
4657                                                     &stcb->asoc,
4658                                                     ND_IFINFO(ifp)->linkmtu);
4659                                         }
4660                                 }
4661                         }
4662                         return (ret);
4663                 }
4664 #endif
4665         default:
4666                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4667                     ((struct sockaddr *)to)->sa_family);
4668                 sctp_m_freem(m);
4669                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4670                 return (EFAULT);
4671         }
4672 }
4673
4674
4675 void
4676 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4677 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4678     SCTP_UNUSED
4679 #endif
4680 )
4681 {
4682         struct mbuf *m, *m_last;
4683         struct sctp_nets *net;
4684         struct sctp_init_chunk *init;
4685         struct sctp_supported_addr_param *sup_addr;
4686         struct sctp_adaptation_layer_indication *ali;
4687         struct sctp_supported_chunk_types_param *pr_supported;
4688         struct sctp_paramhdr *ph;
4689         int cnt_inits_to = 0;
4690         int error;
4691         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4692
4693         /* INIT's always go to the primary (and usually ONLY address) */
4694         net = stcb->asoc.primary_destination;
4695         if (net == NULL) {
4696                 net = TAILQ_FIRST(&stcb->asoc.nets);
4697                 if (net == NULL) {
4698                         /* TSNH */
4699                         return;
4700                 }
4701                 /* we confirm any address we send an INIT to */
4702                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4703                 (void)sctp_set_primary_addr(stcb, NULL, net);
4704         } else {
4705                 /* we confirm any address we send an INIT to */
4706                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4707         }
4708         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4709 #ifdef INET6
4710         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4711                 /*
4712                  * special hook, if we are sending to link local it will not
4713                  * show up in our private address count.
4714                  */
4715                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4716                         cnt_inits_to = 1;
4717         }
4718 #endif
4719         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4720                 /* This case should not happen */
4721                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4722                 return;
4723         }
4724         /* start the INIT timer */
4725         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4726
4727         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4728         if (m == NULL) {
4729                 /* No memory, INIT timer will re-attempt. */
4730                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4731                 return;
4732         }
4733         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4734         padding_len = 0;
4735         /* Now lets put the chunk header in place */
4736         init = mtod(m, struct sctp_init_chunk *);
4737         /* now the chunk header */
4738         init->ch.chunk_type = SCTP_INITIATION;
4739         init->ch.chunk_flags = 0;
4740         /* fill in later from mbuf we build */
4741         init->ch.chunk_length = 0;
4742         /* place in my tag */
4743         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4744         /* set up some of the credits. */
4745         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4746             SCTP_MINIMAL_RWND));
4747         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4748         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4749         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4750
4751         /* Adaptation layer indication parameter */
4752         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4753                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4754                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4755                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4756                 ali->ph.param_length = htons(parameter_len);
4757                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4758                 chunk_len += parameter_len;
4759         }
4760
4761         /* ECN parameter */
4762         if (stcb->asoc.ecn_supported == 1) {
4763                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4764                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4765                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4766                 ph->param_length = htons(parameter_len);
4767                 chunk_len += parameter_len;
4768         }
4769
4770         /* PR-SCTP supported parameter */
4771         if (stcb->asoc.prsctp_supported == 1) {
4772                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4773                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4774                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4775                 ph->param_length = htons(parameter_len);
4776                 chunk_len += parameter_len;
4777         }
4778
4779         /* Add NAT friendly parameter. */
4780         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4781                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4782                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4783                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4784                 ph->param_length = htons(parameter_len);
4785                 chunk_len += parameter_len;
4786         }
4787
4788         /* And now tell the peer which extensions we support */
4789         num_ext = 0;
4790         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4791         if (stcb->asoc.prsctp_supported == 1) {
4792                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4793                 if (stcb->asoc.idata_supported) {
4794                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4795                 }
4796         }
4797         if (stcb->asoc.auth_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4799         }
4800         if (stcb->asoc.asconf_supported == 1) {
4801                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4802                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4803         }
4804         if (stcb->asoc.reconfig_supported == 1) {
4805                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4806         }
4807         if (stcb->asoc.idata_supported) {
4808                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4809         }
4810         if (stcb->asoc.nrsack_supported == 1) {
4811                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4812         }
4813         if (stcb->asoc.pktdrop_supported == 1) {
4814                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4815         }
4816         if (num_ext > 0) {
4817                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4818                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4819                 pr_supported->ph.param_length = htons(parameter_len);
4820                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4821                 chunk_len += parameter_len;
4822         }
4823         /* add authentication parameters */
4824         if (stcb->asoc.auth_supported) {
4825                 /* attach RANDOM parameter, if available */
4826                 if (stcb->asoc.authinfo.random != NULL) {
4827                         struct sctp_auth_random *randp;
4828
4829                         if (padding_len > 0) {
4830                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4831                                 chunk_len += padding_len;
4832                                 padding_len = 0;
4833                         }
4834                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4835                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4836                         /* random key already contains the header */
4837                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4838                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4839                         chunk_len += parameter_len;
4840                 }
4841                 /* add HMAC_ALGO parameter */
4842                 if (stcb->asoc.local_hmacs != NULL) {
4843                         struct sctp_auth_hmac_algo *hmacs;
4844
4845                         if (padding_len > 0) {
4846                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4847                                 chunk_len += padding_len;
4848                                 padding_len = 0;
4849                         }
4850                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4851                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4852                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4853                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4854                         hmacs->ph.param_length = htons(parameter_len);
4855                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4856                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4857                         chunk_len += parameter_len;
4858                 }
4859                 /* add CHUNKS parameter */
4860                 if (stcb->asoc.local_auth_chunks != NULL) {
4861                         struct sctp_auth_chunk_list *chunks;
4862
4863                         if (padding_len > 0) {
4864                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4865                                 chunk_len += padding_len;
4866                                 padding_len = 0;
4867                         }
4868                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4869                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4870                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4871                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4872                         chunks->ph.param_length = htons(parameter_len);
4873                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4874                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4875                         chunk_len += parameter_len;
4876                 }
4877         }
4878
4879         /* now any cookie time extensions */
4880         if (stcb->asoc.cookie_preserve_req) {
4881                 struct sctp_cookie_perserve_param *cookie_preserve;
4882
4883                 if (padding_len > 0) {
4884                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4885                         chunk_len += padding_len;
4886                         padding_len = 0;
4887                 }
4888                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4889                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4890                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4891                 cookie_preserve->ph.param_length = htons(parameter_len);
4892                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4893                 stcb->asoc.cookie_preserve_req = 0;
4894                 chunk_len += parameter_len;
4895         }
4896
4897         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4898                 uint8_t i;
4899
4900                 if (padding_len > 0) {
4901                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4902                         chunk_len += padding_len;
4903                         padding_len = 0;
4904                 }
4905                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4906                 if (stcb->asoc.scope.ipv4_addr_legal) {
4907                         parameter_len += (uint16_t)sizeof(uint16_t);
4908                 }
4909                 if (stcb->asoc.scope.ipv6_addr_legal) {
4910                         parameter_len += (uint16_t)sizeof(uint16_t);
4911                 }
4912                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4913                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4914                 sup_addr->ph.param_length = htons(parameter_len);
4915                 i = 0;
4916                 if (stcb->asoc.scope.ipv4_addr_legal) {
4917                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4918                 }
4919                 if (stcb->asoc.scope.ipv6_addr_legal) {
4920                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4921                 }
4922                 padding_len = 4 - 2 * i;
4923                 chunk_len += parameter_len;
4924         }
4925
4926         SCTP_BUF_LEN(m) = chunk_len;
4927         /* now the addresses */
4928         /*
4929          * To optimize this we could put the scoping stuff into a structure
4930          * and remove the individual uint8's from the assoc structure. Then
4931          * we could just sifa in the address within the stcb. But for now
4932          * this is a quick hack to get the address stuff teased apart.
4933          */
4934         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4935             m, cnt_inits_to,
4936             &padding_len, &chunk_len);
4937
4938         init->ch.chunk_length = htons(chunk_len);
4939         if (padding_len > 0) {
4940                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4941                         sctp_m_freem(m);
4942                         return;
4943                 }
4944         }
4945         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4946         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4947             (struct sockaddr *)&net->ro._l_addr,
4948             m, 0, NULL, 0, 0, 0, 0,
4949             inp->sctp_lport, stcb->rport, htonl(0),
4950             net->port, NULL,
4951             0, 0,
4952             so_locked))) {
4953                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4954                 if (error == ENOBUFS) {
4955                         stcb->asoc.ifp_had_enobuf = 1;
4956                         SCTP_STAT_INCR(sctps_lowlevelerr);
4957                 }
4958         } else {
4959                 stcb->asoc.ifp_had_enobuf = 0;
4960         }
4961         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4962         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4963 }
4964
4965 struct mbuf *
4966 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4967     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4968 {
4969         /*
4970          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4971          * being equal to the beginning of the params i.e. (iphlen +
4972          * sizeof(struct sctp_init_msg) parse through the parameters to the
4973          * end of the mbuf verifying that all parameters are known.
4974          *
4975          * For unknown parameters build and return a mbuf with
4976          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4977          * processing this chunk stop, and set *abort_processing to 1.
4978          *
4979          * By having param_offset be pre-set to where parameters begin it is
4980          * hoped that this routine may be reused in the future by new
4981          * features.
4982          */
4983         struct sctp_paramhdr *phdr, params;
4984
4985         struct mbuf *mat, *op_err;
4986         int at, limit, pad_needed;
4987         uint16_t ptype, plen, padded_size;
4988         int err_at;
4989
4990         *abort_processing = 0;
4991         mat = in_initpkt;
4992         err_at = 0;
4993         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4994         at = param_offset;
4995         op_err = NULL;
4996         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4997         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4998         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4999                 ptype = ntohs(phdr->param_type);
5000                 plen = ntohs(phdr->param_length);
5001                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5002                         /* wacked parameter */
5003                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5004                         goto invalid_size;
5005                 }
5006                 limit -= SCTP_SIZE32(plen);
5007                 /*-
5008                  * All parameters for all chunks that we know/understand are
5009                  * listed here. We process them other places and make
5010                  * appropriate stop actions per the upper bits. However this
5011                  * is the generic routine processor's can call to get back
5012                  * an operr.. to either incorporate (init-ack) or send.
5013                  */
5014                 padded_size = SCTP_SIZE32(plen);
5015                 switch (ptype) {
5016                         /* Param's with variable size */
5017                 case SCTP_HEARTBEAT_INFO:
5018                 case SCTP_STATE_COOKIE:
5019                 case SCTP_UNRECOG_PARAM:
5020                 case SCTP_ERROR_CAUSE_IND:
5021                         /* ok skip fwd */
5022                         at += padded_size;
5023                         break;
5024                         /* Param's with variable size within a range */
5025                 case SCTP_CHUNK_LIST:
5026                 case SCTP_SUPPORTED_CHUNK_EXT:
5027                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5028                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5029                                 goto invalid_size;
5030                         }
5031                         at += padded_size;
5032                         break;
5033                 case SCTP_SUPPORTED_ADDRTYPE:
5034                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5035                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5036                                 goto invalid_size;
5037                         }
5038                         at += padded_size;
5039                         break;
5040                 case SCTP_RANDOM:
5041                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5042                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5043                                 goto invalid_size;
5044                         }
5045                         at += padded_size;
5046                         break;
5047                 case SCTP_SET_PRIM_ADDR:
5048                 case SCTP_DEL_IP_ADDRESS:
5049                 case SCTP_ADD_IP_ADDRESS:
5050                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5051                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5053                                 goto invalid_size;
5054                         }
5055                         at += padded_size;
5056                         break;
5057                         /* Param's with a fixed size */
5058                 case SCTP_IPV4_ADDRESS:
5059                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5060                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5061                                 goto invalid_size;
5062                         }
5063                         at += padded_size;
5064                         break;
5065                 case SCTP_IPV6_ADDRESS:
5066                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5067                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5068                                 goto invalid_size;
5069                         }
5070                         at += padded_size;
5071                         break;
5072                 case SCTP_COOKIE_PRESERVE:
5073                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5074                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5075                                 goto invalid_size;
5076                         }
5077                         at += padded_size;
5078                         break;
5079                 case SCTP_HAS_NAT_SUPPORT:
5080                         *nat_friendly = 1;
5081                         /* fall through */
5082                 case SCTP_PRSCTP_SUPPORTED:
5083                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5084                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5085                                 goto invalid_size;
5086                         }
5087                         at += padded_size;
5088                         break;
5089                 case SCTP_ECN_CAPABLE:
5090                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5091                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5092                                 goto invalid_size;
5093                         }
5094                         at += padded_size;
5095                         break;
5096                 case SCTP_ULP_ADAPTATION:
5097                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5098                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5099                                 goto invalid_size;
5100                         }
5101                         at += padded_size;
5102                         break;
5103                 case SCTP_SUCCESS_REPORT:
5104                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5105                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5106                                 goto invalid_size;
5107                         }
5108                         at += padded_size;
5109                         break;
5110                 case SCTP_HOSTNAME_ADDRESS:
5111                         {
5112                                 /* We can NOT handle HOST NAME addresses!! */
5113                                 int l_len;
5114
5115                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5116                                 *abort_processing = 1;
5117                                 if (op_err == NULL) {
5118                                         /* Ok need to try to get a mbuf */
5119 #ifdef INET6
5120                                         l_len = SCTP_MIN_OVERHEAD;
5121 #else
5122                                         l_len = SCTP_MIN_V4_OVERHEAD;
5123 #endif
5124                                         l_len += sizeof(struct sctp_chunkhdr);
5125                                         l_len += sizeof(struct sctp_gen_error_cause);
5126                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5127                                         if (op_err) {
5128                                                 SCTP_BUF_LEN(op_err) = 0;
5129                                                 /*
5130                                                  * Pre-reserve space for IP,
5131                                                  * SCTP, and chunk header.
5132                                                  */
5133 #ifdef INET6
5134                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5135 #else
5136                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5137 #endif
5138                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5139                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5140                                         }
5141                                 }
5142                                 if (op_err) {
5143                                         /* If we have space */
5144                                         struct sctp_gen_error_cause cause;
5145
5146                                         if (err_at % 4) {
5147                                                 uint32_t cpthis = 0;
5148
5149                                                 pad_needed = 4 - (err_at % 4);
5150                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5151                                                 err_at += pad_needed;
5152                                         }
5153                                         cause.code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5154                                         cause.length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5155                                         m_copyback(op_err, err_at, sizeof(struct sctp_gen_error_cause), (caddr_t)&cause);
5156                                         err_at += sizeof(struct sctp_gen_error_cause);
5157                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5158                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5159                                                 sctp_m_freem(op_err);
5160                                                 return (NULL);
5161                                         }
5162                                 }
5163                                 return (op_err);
5164                                 break;
5165                         }
5166                 default:
5167                         /*
5168                          * we do not recognize the parameter figure out what
5169                          * we do.
5170                          */
5171                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5172                         if ((ptype & 0x4000) == 0x4000) {
5173                                 /* Report bit is set?? */
5174                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5175                                 if (op_err == NULL) {
5176                                         int l_len;
5177
5178                                         /* Ok need to try to get an mbuf */
5179 #ifdef INET6
5180                                         l_len = SCTP_MIN_OVERHEAD;
5181 #else
5182                                         l_len = SCTP_MIN_V4_OVERHEAD;
5183 #endif
5184                                         l_len += sizeof(struct sctp_chunkhdr);
5185                                         l_len += sizeof(struct sctp_paramhdr);
5186                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5187                                         if (op_err) {
5188                                                 SCTP_BUF_LEN(op_err) = 0;
5189 #ifdef INET6
5190                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5191 #else
5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5193 #endif
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5195                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5196                                         }
5197                                 }
5198                                 if (op_err) {
5199                                         /* If we have space */
5200                                         struct sctp_paramhdr s;
5201
5202                                         if (err_at % 4) {
5203                                                 uint32_t cpthis = 0;
5204
5205                                                 pad_needed = 4 - (err_at % 4);
5206                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5207                                                 err_at += pad_needed;
5208                                         }
5209                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5210                                         s.param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5211                                         m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)&s);
5212                                         err_at += sizeof(struct sctp_paramhdr);
5213                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5214                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5215                                                 sctp_m_freem(op_err);
5216                                                 /*
5217                                                  * we are out of memory but
5218                                                  * we still need to have a
5219                                                  * look at what to do (the
5220                                                  * system is in trouble
5221                                                  * though).
5222                                                  */
5223                                                 op_err = NULL;
5224                                                 goto more_processing;
5225                                         }
5226                                         err_at += plen;
5227                                 }
5228                         }
5229         more_processing:
5230                         if ((ptype & 0x8000) == 0x0000) {
5231                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5232                                 return (op_err);
5233                         } else {
5234                                 /* skip this chunk and continue processing */
5235                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5236                                 at += SCTP_SIZE32(plen);
5237                         }
5238                         break;
5239
5240                 }
5241                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5242         }
5243         return (op_err);
5244 invalid_size:
5245         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5246         *abort_processing = 1;
5247         if ((op_err == NULL) && phdr) {
5248                 int l_len;
5249 #ifdef INET6
5250                 l_len = SCTP_MIN_OVERHEAD;
5251 #else
5252                 l_len = SCTP_MIN_V4_OVERHEAD;
5253 #endif
5254                 l_len += sizeof(struct sctp_chunkhdr);
5255                 l_len += (2 * sizeof(struct sctp_paramhdr));
5256                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5257                 if (op_err) {
5258                         SCTP_BUF_LEN(op_err) = 0;
5259 #ifdef INET6
5260                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5261 #else
5262                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5263 #endif
5264                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5266                 }
5267         }
5268         if ((op_err) && phdr) {
5269                 struct sctp_paramhdr s;
5270
5271                 if (err_at % 4) {
5272                         uint32_t cpthis = 0;
5273
5274                         pad_needed = 4 - (err_at % 4);
5275                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5276                         err_at += pad_needed;
5277                 }
5278                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5279                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5280                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5281                 err_at += sizeof(s);
5282                 /* Only copy back the p-hdr that caused the issue */
5283                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5284         }
5285         return (op_err);
5286 }
5287
5288 static int
5289 sctp_are_there_new_addresses(struct sctp_association *asoc,
5290     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5291 {
5292         /*
5293          * Given a INIT packet, look through the packet to verify that there
5294          * are NO new addresses. As we go through the parameters add reports
5295          * of any un-understood parameters that require an error.  Also we
5296          * must return (1) to drop the packet if we see a un-understood
5297          * parameter that tells us to drop the chunk.
5298          */
5299         struct sockaddr *sa_touse;
5300         struct sockaddr *sa;
5301         struct sctp_paramhdr *phdr, params;
5302         uint16_t ptype, plen;
5303         uint8_t fnd;
5304         struct sctp_nets *net;
5305         int check_src;
5306 #ifdef INET
5307         struct sockaddr_in sin4, *sa4;
5308 #endif
5309 #ifdef INET6
5310         struct sockaddr_in6 sin6, *sa6;
5311 #endif
5312
5313 #ifdef INET
5314         memset(&sin4, 0, sizeof(sin4));
5315         sin4.sin_family = AF_INET;
5316         sin4.sin_len = sizeof(sin4);
5317 #endif
5318 #ifdef INET6
5319         memset(&sin6, 0, sizeof(sin6));
5320         sin6.sin6_family = AF_INET6;
5321         sin6.sin6_len = sizeof(sin6);
5322 #endif
5323         /* First what about the src address of the pkt ? */
5324         check_src = 0;
5325         switch (src->sa_family) {
5326 #ifdef INET
5327         case AF_INET:
5328                 if (asoc->scope.ipv4_addr_legal) {
5329                         check_src = 1;
5330                 }
5331                 break;
5332 #endif
5333 #ifdef INET6
5334         case AF_INET6:
5335                 if (asoc->scope.ipv6_addr_legal) {
5336                         check_src = 1;
5337                 }
5338                 break;
5339 #endif
5340         default:
5341                 /* TSNH */
5342                 break;
5343         }
5344         if (check_src) {
5345                 fnd = 0;
5346                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5347                         sa = (struct sockaddr *)&net->ro._l_addr;
5348                         if (sa->sa_family == src->sa_family) {
5349 #ifdef INET
5350                                 if (sa->sa_family == AF_INET) {
5351                                         struct sockaddr_in *src4;
5352
5353                                         sa4 = (struct sockaddr_in *)sa;
5354                                         src4 = (struct sockaddr_in *)src;
5355                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5356                                                 fnd = 1;
5357                                                 break;
5358                                         }
5359                                 }
5360 #endif
5361 #ifdef INET6
5362                                 if (sa->sa_family == AF_INET6) {
5363                                         struct sockaddr_in6 *src6;
5364
5365                                         sa6 = (struct sockaddr_in6 *)sa;
5366                                         src6 = (struct sockaddr_in6 *)src;
5367                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5368                                                 fnd = 1;
5369                                                 break;
5370                                         }
5371                                 }
5372 #endif
5373                         }
5374                 }
5375                 if (fnd == 0) {
5376                         /* New address added! no need to look further. */
5377                         return (1);
5378                 }
5379         }
5380         /* Ok so far lets munge through the rest of the packet */
5381         offset += sizeof(struct sctp_init_chunk);
5382         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5383         while (phdr) {
5384                 sa_touse = NULL;
5385                 ptype = ntohs(phdr->param_type);
5386                 plen = ntohs(phdr->param_length);
5387                 switch (ptype) {
5388 #ifdef INET
5389                 case SCTP_IPV4_ADDRESS:
5390                         {
5391                                 struct sctp_ipv4addr_param *p4, p4_buf;
5392
5393                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5394                                         return (1);
5395                                 }
5396                                 phdr = sctp_get_next_param(in_initpkt, offset,
5397                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5398                                 if (phdr == NULL) {
5399                                         return (1);
5400                                 }
5401                                 if (asoc->scope.ipv4_addr_legal) {
5402                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5403                                         sin4.sin_addr.s_addr = p4->addr;
5404                                         sa_touse = (struct sockaddr *)&sin4;
5405                                 }
5406                                 break;
5407                         }
5408 #endif
5409 #ifdef INET6
5410                 case SCTP_IPV6_ADDRESS:
5411                         {
5412                                 struct sctp_ipv6addr_param *p6, p6_buf;
5413
5414                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5415                                         return (1);
5416                                 }
5417                                 phdr = sctp_get_next_param(in_initpkt, offset,
5418                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5419                                 if (phdr == NULL) {
5420                                         return (1);
5421                                 }
5422                                 if (asoc->scope.ipv6_addr_legal) {
5423                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5424                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5425                                             sizeof(p6->addr));
5426                                         sa_touse = (struct sockaddr *)&sin6;
5427                                 }
5428                                 break;
5429                         }
5430 #endif
5431                 default:
5432                         sa_touse = NULL;
5433                         break;
5434                 }
5435                 if (sa_touse) {
5436                         /* ok, sa_touse points to one to check */
5437                         fnd = 0;
5438                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5439                                 sa = (struct sockaddr *)&net->ro._l_addr;
5440                                 if (sa->sa_family != sa_touse->sa_family) {
5441                                         continue;
5442                                 }
5443 #ifdef INET
5444                                 if (sa->sa_family == AF_INET) {
5445                                         sa4 = (struct sockaddr_in *)sa;
5446                                         if (sa4->sin_addr.s_addr ==
5447                                             sin4.sin_addr.s_addr) {
5448                                                 fnd = 1;
5449                                                 break;
5450                                         }
5451                                 }
5452 #endif
5453 #ifdef INET6
5454                                 if (sa->sa_family == AF_INET6) {
5455                                         sa6 = (struct sockaddr_in6 *)sa;
5456                                         if (SCTP6_ARE_ADDR_EQUAL(
5457                                             sa6, &sin6)) {
5458                                                 fnd = 1;
5459                                                 break;
5460                                         }
5461                                 }
5462 #endif
5463                         }
5464                         if (!fnd) {
5465                                 /* New addr added! no need to look further */
5466                                 return (1);
5467                         }
5468                 }
5469                 offset += SCTP_SIZE32(plen);
5470                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5471         }
5472         return (0);
5473 }
5474
5475 /*
5476  * Given a MBUF chain that was sent into us containing an INIT. Build a
5477  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5478  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5479  * message (i.e. the struct sctp_init_msg).
5480  */
5481 void
5482 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5483     struct sctp_nets *src_net, struct mbuf *init_pkt,
5484     int iphlen, int offset,
5485     struct sockaddr *src, struct sockaddr *dst,
5486     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5487     uint8_t mflowtype, uint32_t mflowid,
5488     uint32_t vrf_id, uint16_t port)
5489 {
5490         struct sctp_association *asoc;
5491         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5492         struct sctp_init_ack_chunk *initack;
5493         struct sctp_adaptation_layer_indication *ali;
5494         struct sctp_supported_chunk_types_param *pr_supported;
5495         struct sctp_paramhdr *ph;
5496         union sctp_sockstore *over_addr;
5497         struct sctp_scoping scp;
5498         struct timeval now;
5499 #ifdef INET
5500         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5501         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5502         struct sockaddr_in *sin;
5503 #endif
5504 #ifdef INET6
5505         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5506         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5507         struct sockaddr_in6 *sin6;
5508 #endif
5509         struct sockaddr *to;
5510         struct sctp_state_cookie stc;
5511         struct sctp_nets *net = NULL;
5512         uint8_t *signature = NULL;
5513         int cnt_inits_to = 0;
5514         uint16_t his_limit, i_want;
5515         int abort_flag;
5516         int nat_friendly = 0;
5517         int error;
5518         struct socket *so;
5519         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5520
5521         if (stcb) {
5522                 asoc = &stcb->asoc;
5523         } else {
5524                 asoc = NULL;
5525         }
5526         if ((asoc != NULL) &&
5527             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5528                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5529                         /*
5530                          * new addresses, out of here in non-cookie-wait
5531                          * states
5532                          *
5533                          * Send an ABORT, without the new address error
5534                          * cause. This looks no different than if no
5535                          * listener was present.
5536                          */
5537                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5538                             "Address added");
5539                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5540                             mflowtype, mflowid, inp->fibnum,
5541                             vrf_id, port);
5542                         return;
5543                 }
5544                 if (src_net != NULL && (src_net->port != port)) {
5545                         /*
5546                          * change of remote encapsulation port, out of here
5547                          * in non-cookie-wait states
5548                          *
5549                          * Send an ABORT, without an specific error cause.
5550                          * This looks no different than if no listener was
5551                          * present.
5552                          */
5553                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5554                             "Remote encapsulation port changed");
5555                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5556                             mflowtype, mflowid, inp->fibnum,
5557                             vrf_id, port);
5558                         return;
5559                 }
5560         }
5561         abort_flag = 0;
5562         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5563             (offset + sizeof(struct sctp_init_chunk)),
5564             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5565         if (abort_flag) {
5566 do_a_abort:
5567                 if (op_err == NULL) {
5568                         char msg[SCTP_DIAG_INFO_LEN];
5569
5570                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5571                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5572                             msg);
5573                 }
5574                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5575                     init_chk->init.initiate_tag, op_err,
5576                     mflowtype, mflowid, inp->fibnum,
5577                     vrf_id, port);
5578                 return;
5579         }
5580         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5581         if (m == NULL) {
5582                 /* No memory, INIT timer will re-attempt. */
5583                 if (op_err)
5584                         sctp_m_freem(op_err);
5585                 return;
5586         }
5587         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5588         padding_len = 0;
5589
5590         /*
5591          * We might not overwrite the identification[] completely and on
5592          * some platforms time_entered will contain some padding. Therefore
5593          * zero out the cookie to avoid putting uninitialized memory on the
5594          * wire.
5595          */
5596         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5597
5598         /* the time I built cookie */
5599         (void)SCTP_GETTIME_TIMEVAL(&now);
5600         stc.time_entered.tv_sec = now.tv_sec;
5601         stc.time_entered.tv_usec = now.tv_usec;
5602
5603         /* populate any tie tags */
5604         if (asoc != NULL) {
5605                 /* unlock before tag selections */
5606                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5607                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5608                 stc.cookie_life = asoc->cookie_life;
5609                 net = asoc->primary_destination;
5610         } else {
5611                 stc.tie_tag_my_vtag = 0;
5612                 stc.tie_tag_peer_vtag = 0;
5613                 /* life I will award this cookie */
5614                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5615         }
5616
5617         /* copy in the ports for later check */
5618         stc.myport = sh->dest_port;
5619         stc.peerport = sh->src_port;
5620
5621         /*
5622          * If we wanted to honor cookie life extensions, we would add to
5623          * stc.cookie_life. For now we should NOT honor any extension
5624          */
5625         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5626         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5627                 stc.ipv6_addr_legal = 1;
5628                 if (SCTP_IPV6_V6ONLY(inp)) {
5629                         stc.ipv4_addr_legal = 0;
5630                 } else {
5631                         stc.ipv4_addr_legal = 1;
5632                 }
5633         } else {
5634                 stc.ipv6_addr_legal = 0;
5635                 stc.ipv4_addr_legal = 1;
5636         }
5637         stc.ipv4_scope = 0;
5638         if (net == NULL) {
5639                 to = src;
5640                 switch (dst->sa_family) {
5641 #ifdef INET
5642                 case AF_INET:
5643                         {
5644                                 /* lookup address */
5645                                 stc.address[0] = src4->sin_addr.s_addr;
5646                                 stc.address[1] = 0;
5647                                 stc.address[2] = 0;
5648                                 stc.address[3] = 0;
5649                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5650                                 /* local from address */
5651                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5652                                 stc.laddress[1] = 0;
5653                                 stc.laddress[2] = 0;
5654                                 stc.laddress[3] = 0;
5655                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5656                                 /* scope_id is only for v6 */
5657                                 stc.scope_id = 0;
5658                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5659                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5660                                         stc.ipv4_scope = 1;
5661                                 }
5662                                 /* Must use the address in this case */
5663                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5664                                         stc.loopback_scope = 1;
5665                                         stc.ipv4_scope = 1;
5666                                         stc.site_scope = 1;
5667                                         stc.local_scope = 0;
5668                                 }
5669                                 break;
5670                         }
5671 #endif
5672 #ifdef INET6
5673                 case AF_INET6:
5674                         {
5675                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5676                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5677                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5678                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5679                                         stc.loopback_scope = 1;
5680                                         stc.local_scope = 0;
5681                                         stc.site_scope = 1;
5682                                         stc.ipv4_scope = 1;
5683                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5684                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5685                                         /*
5686                                          * If the new destination or source
5687                                          * is a LINK_LOCAL we must have
5688                                          * common both site and local scope.
5689                                          * Don't set local scope though
5690                                          * since we must depend on the
5691                                          * source to be added implicitly. We
5692                                          * cannot assure just because we
5693                                          * share one link that all links are
5694                                          * common.
5695                                          */
5696                                         stc.local_scope = 0;
5697                                         stc.site_scope = 1;
5698                                         stc.ipv4_scope = 1;
5699                                         /*
5700                                          * we start counting for the private
5701                                          * address stuff at 1. since the
5702                                          * link local we source from won't
5703                                          * show up in our scoped count.
5704                                          */
5705                                         cnt_inits_to = 1;
5706                                         /*
5707                                          * pull out the scope_id from
5708                                          * incoming pkt
5709                                          */
5710                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5711                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5712                                         /*
5713                                          * If the new destination or source
5714                                          * is SITE_LOCAL then we must have
5715                                          * site scope in common.
5716                                          */
5717                                         stc.site_scope = 1;
5718                                 }
5719                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5720                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5721                                 break;
5722                         }
5723 #endif
5724                 default:
5725                         /* TSNH */
5726                         goto do_a_abort;
5727                         break;
5728                 }
5729         } else {
5730                 /* set the scope per the existing tcb */
5731
5732 #ifdef INET6
5733                 struct sctp_nets *lnet;
5734 #endif
5735
5736                 stc.loopback_scope = asoc->scope.loopback_scope;
5737                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5738                 stc.site_scope = asoc->scope.site_scope;
5739                 stc.local_scope = asoc->scope.local_scope;
5740 #ifdef INET6
5741                 /* Why do we not consider IPv4 LL addresses? */
5742                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5743                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5744                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5745                                         /*
5746                                          * if we have a LL address, start
5747                                          * counting at 1.
5748                                          */
5749                                         cnt_inits_to = 1;
5750                                 }
5751                         }
5752                 }
5753 #endif
5754                 /* use the net pointer */
5755                 to = (struct sockaddr *)&net->ro._l_addr;
5756                 switch (to->sa_family) {
5757 #ifdef INET
5758                 case AF_INET:
5759                         sin = (struct sockaddr_in *)to;
5760                         stc.address[0] = sin->sin_addr.s_addr;
5761                         stc.address[1] = 0;
5762                         stc.address[2] = 0;
5763                         stc.address[3] = 0;
5764                         stc.addr_type = SCTP_IPV4_ADDRESS;
5765                         if (net->src_addr_selected == 0) {
5766                                 /*
5767                                  * strange case here, the INIT should have
5768                                  * did the selection.
5769                                  */
5770                                 net->ro._s_addr = sctp_source_address_selection(inp,
5771                                     stcb, (sctp_route_t *)&net->ro,
5772                                     net, 0, vrf_id);
5773                                 if (net->ro._s_addr == NULL)
5774                                         return;
5775
5776                                 net->src_addr_selected = 1;
5777
5778                         }
5779                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5780                         stc.laddress[1] = 0;
5781                         stc.laddress[2] = 0;
5782                         stc.laddress[3] = 0;
5783                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5784                         /* scope_id is only for v6 */
5785                         stc.scope_id = 0;
5786                         break;
5787 #endif
5788 #ifdef INET6
5789                 case AF_INET6:
5790                         sin6 = (struct sockaddr_in6 *)to;
5791                         memcpy(&stc.address, &sin6->sin6_addr,
5792                             sizeof(struct in6_addr));
5793                         stc.addr_type = SCTP_IPV6_ADDRESS;
5794                         stc.scope_id = sin6->sin6_scope_id;
5795                         if (net->src_addr_selected == 0) {
5796                                 /*
5797                                  * strange case here, the INIT should have
5798                                  * done the selection.
5799                                  */
5800                                 net->ro._s_addr = sctp_source_address_selection(inp,
5801                                     stcb, (sctp_route_t *)&net->ro,
5802                                     net, 0, vrf_id);
5803                                 if (net->ro._s_addr == NULL)
5804                                         return;
5805
5806                                 net->src_addr_selected = 1;
5807                         }
5808                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5809                             sizeof(struct in6_addr));
5810                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5811                         break;
5812 #endif
5813                 }
5814         }
5815         /* Now lets put the SCTP header in place */
5816         initack = mtod(m, struct sctp_init_ack_chunk *);
5817         /* Save it off for quick ref */
5818         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5819         /* who are we */
5820         memcpy(stc.identification, SCTP_VERSION_STRING,
5821             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5822         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5823         /* now the chunk header */
5824         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5825         initack->ch.chunk_flags = 0;
5826         /* fill in later from mbuf we build */
5827         initack->ch.chunk_length = 0;
5828         /* place in my tag */
5829         if ((asoc != NULL) &&
5830             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5831             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5832             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5833                 /* re-use the v-tags and init-seq here */
5834                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5835                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5836         } else {
5837                 uint32_t vtag, itsn;
5838
5839                 if (asoc) {
5840                         atomic_add_int(&asoc->refcnt, 1);
5841                         SCTP_TCB_UNLOCK(stcb);
5842         new_tag:
5843                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5844                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5845                                 /*
5846                                  * Got a duplicate vtag on some guy behind a
5847                                  * nat make sure we don't use it.
5848                                  */
5849                                 goto new_tag;
5850                         }
5851                         initack->init.initiate_tag = htonl(vtag);
5852                         /* get a TSN to use too */
5853                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5854                         initack->init.initial_tsn = htonl(itsn);
5855                         SCTP_TCB_LOCK(stcb);
5856                         atomic_add_int(&asoc->refcnt, -1);
5857                 } else {
5858                         SCTP_INP_INCR_REF(inp);
5859                         SCTP_INP_RUNLOCK(inp);
5860                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5861                         initack->init.initiate_tag = htonl(vtag);
5862                         /* get a TSN to use too */
5863                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5864                         SCTP_INP_RLOCK(inp);
5865                         SCTP_INP_DECR_REF(inp);
5866                 }
5867         }
5868         /* save away my tag to */
5869         stc.my_vtag = initack->init.initiate_tag;
5870
5871         /* set up some of the credits. */
5872         so = inp->sctp_socket;
5873         if (so == NULL) {
5874                 /* memory problem */
5875                 sctp_m_freem(m);
5876                 return;
5877         } else {
5878                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5879         }
5880         /* set what I want */
5881         his_limit = ntohs(init_chk->init.num_inbound_streams);
5882         /* choose what I want */
5883         if (asoc != NULL) {
5884                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5885                         i_want = asoc->streamoutcnt;
5886                 } else {
5887                         i_want = asoc->pre_open_streams;
5888                 }
5889         } else {
5890                 i_want = inp->sctp_ep.pre_open_stream_count;
5891         }
5892         if (his_limit < i_want) {
5893                 /* I Want more :< */
5894                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5895         } else {
5896                 /* I can have what I want :> */
5897                 initack->init.num_outbound_streams = htons(i_want);
5898         }
5899         /* tell him his limit. */
5900         initack->init.num_inbound_streams =
5901             htons(inp->sctp_ep.max_open_streams_intome);
5902
5903         /* adaptation layer indication parameter */
5904         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5905                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5906                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5907                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5908                 ali->ph.param_length = htons(parameter_len);
5909                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5910                 chunk_len += parameter_len;
5911         }
5912
5913         /* ECN parameter */
5914         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5915             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5916                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5917                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5918                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5919                 ph->param_length = htons(parameter_len);
5920                 chunk_len += parameter_len;
5921         }
5922
5923         /* PR-SCTP supported parameter */
5924         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5925             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5926                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5927                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5928                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5929                 ph->param_length = htons(parameter_len);
5930                 chunk_len += parameter_len;
5931         }
5932
5933         /* Add NAT friendly parameter */
5934         if (nat_friendly) {
5935                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5936                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5937                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5938                 ph->param_length = htons(parameter_len);
5939                 chunk_len += parameter_len;
5940         }
5941
5942         /* And now tell the peer which extensions we support */
5943         num_ext = 0;
5944         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5945         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5946             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5947                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5948                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5949                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5950                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5951                 }
5952         }
5953         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5954             ((asoc == NULL) && (inp->auth_supported == 1))) {
5955                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5956         }
5957         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5958             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5959                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5960                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5961         }
5962         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5963             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5964                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5965         }
5966         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5967             ((asoc == NULL) && (inp->idata_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5969         }
5970         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5971             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5973         }
5974         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5975             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5976                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5977         }
5978         if (num_ext > 0) {
5979                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5980                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5981                 pr_supported->ph.param_length = htons(parameter_len);
5982                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5983                 chunk_len += parameter_len;
5984         }
5985
5986         /* add authentication parameters */
5987         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5988             ((asoc == NULL) && (inp->auth_supported == 1))) {
5989                 struct sctp_auth_random *randp;
5990                 struct sctp_auth_hmac_algo *hmacs;
5991                 struct sctp_auth_chunk_list *chunks;
5992
5993                 if (padding_len > 0) {
5994                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5995                         chunk_len += padding_len;
5996                         padding_len = 0;
5997                 }
5998                 /* generate and add RANDOM parameter */
5999                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6000                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6001                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6002                 randp->ph.param_type = htons(SCTP_RANDOM);
6003                 randp->ph.param_length = htons(parameter_len);
6004                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6005                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6006                 chunk_len += parameter_len;
6007
6008                 if (padding_len > 0) {
6009                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6010                         chunk_len += padding_len;
6011                         padding_len = 0;
6012                 }
6013                 /* add HMAC_ALGO parameter */
6014                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6015                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6016                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6017                     (uint8_t *)hmacs->hmac_ids);
6018                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6019                 hmacs->ph.param_length = htons(parameter_len);
6020                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6021                 chunk_len += parameter_len;
6022
6023                 if (padding_len > 0) {
6024                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6025                         chunk_len += padding_len;
6026                         padding_len = 0;
6027                 }
6028                 /* add CHUNKS parameter */
6029                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6030                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6031                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6032                     chunks->chunk_types);
6033                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6034                 chunks->ph.param_length = htons(parameter_len);
6035                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6036                 chunk_len += parameter_len;
6037         }
6038         SCTP_BUF_LEN(m) = chunk_len;
6039         m_last = m;
6040         /* now the addresses */
6041         /*
6042          * To optimize this we could put the scoping stuff into a structure
6043          * and remove the individual uint8's from the stc structure. Then we
6044          * could just sifa in the address within the stc.. but for now this
6045          * is a quick hack to get the address stuff teased apart.
6046          */
6047         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6048         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6049         scp.loopback_scope = stc.loopback_scope;
6050         scp.ipv4_local_scope = stc.ipv4_scope;
6051         scp.local_scope = stc.local_scope;
6052         scp.site_scope = stc.site_scope;
6053         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6054             cnt_inits_to,
6055             &padding_len, &chunk_len);
6056         /* padding_len can only be positive, if no addresses have been added */
6057         if (padding_len > 0) {
6058                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6059                 chunk_len += padding_len;
6060                 SCTP_BUF_LEN(m) += padding_len;
6061                 padding_len = 0;
6062         }
6063
6064         /* tack on the operational error if present */
6065         if (op_err) {
6066                 parameter_len = 0;
6067                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6068                         parameter_len += SCTP_BUF_LEN(m_tmp);
6069                 }
6070                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6071                 SCTP_BUF_NEXT(m_last) = op_err;
6072                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6073                         m_last = SCTP_BUF_NEXT(m_last);
6074                 }
6075                 chunk_len += parameter_len;
6076         }
6077         if (padding_len > 0) {
6078                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6079                 if (m_last == NULL) {
6080                         /* Houston we have a problem, no space */
6081                         sctp_m_freem(m);
6082                         return;
6083                 }
6084                 chunk_len += padding_len;
6085                 padding_len = 0;
6086         }
6087         /* Now we must build a cookie */
6088         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6089         if (m_cookie == NULL) {
6090                 /* memory problem */
6091                 sctp_m_freem(m);
6092                 return;
6093         }
6094         /* Now append the cookie to the end and update the space/size */
6095         SCTP_BUF_NEXT(m_last) = m_cookie;
6096         parameter_len = 0;
6097         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6098                 parameter_len += SCTP_BUF_LEN(m_tmp);
6099                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6100                         m_last = m_tmp;
6101                 }
6102         }
6103         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6104         chunk_len += parameter_len;
6105
6106         /*
6107          * Place in the size, but we don't include the last pad (if any) in
6108          * the INIT-ACK.
6109          */
6110         initack->ch.chunk_length = htons(chunk_len);
6111
6112         /*
6113          * Time to sign the cookie, we don't sign over the cookie signature
6114          * though thus we set trailer.
6115          */
6116         (void)sctp_hmac_m(SCTP_HMAC,
6117             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6118             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6119             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6120         /*
6121          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6122          * here since the timer will drive a retranmission.
6123          */
6124         if (padding_len > 0) {
6125                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6126                         sctp_m_freem(m);
6127                         return;
6128                 }
6129         }
6130         if (stc.loopback_scope) {
6131                 over_addr = (union sctp_sockstore *)dst;
6132         } else {
6133                 over_addr = NULL;
6134         }
6135
6136         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6137             0, 0,
6138             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6139             port, over_addr,
6140             mflowtype, mflowid,
6141             SCTP_SO_NOT_LOCKED))) {
6142                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6143                 if (error == ENOBUFS) {
6144                         if (asoc != NULL) {
6145                                 asoc->ifp_had_enobuf = 1;
6146                         }
6147                         SCTP_STAT_INCR(sctps_lowlevelerr);
6148                 }
6149         } else {
6150                 if (asoc != NULL) {
6151                         asoc->ifp_had_enobuf = 0;
6152                 }
6153         }
6154         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6155 }
6156
6157
6158 static void
6159 sctp_prune_prsctp(struct sctp_tcb *stcb,
6160     struct sctp_association *asoc,
6161     struct sctp_sndrcvinfo *srcv,
6162     int dataout)
6163 {
6164         int freed_spc = 0;
6165         struct sctp_tmit_chunk *chk, *nchk;
6166
6167         SCTP_TCB_LOCK_ASSERT(stcb);
6168         if ((asoc->prsctp_supported) &&
6169             (asoc->sent_queue_cnt_removeable > 0)) {
6170                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6171                         /*
6172                          * Look for chunks marked with the PR_SCTP flag AND
6173                          * the buffer space flag. If the one being sent is
6174                          * equal or greater priority then purge the old one
6175                          * and free some space.
6176                          */
6177                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6178                                 /*
6179                                  * This one is PR-SCTP AND buffer space
6180                                  * limited type
6181                                  */
6182                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6183                                         /*
6184                                          * Lower numbers equates to higher
6185                                          * priority so if the one we are
6186                                          * looking at has a larger or equal
6187                                          * priority we want to drop the data
6188                                          * and NOT retransmit it.
6189                                          */
6190                                         if (chk->data) {
6191                                                 /*
6192                                                  * We release the book_size
6193                                                  * if the mbuf is here
6194                                                  */
6195                                                 int ret_spc;
6196                                                 uint8_t sent;
6197
6198                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6199                                                         sent = 1;
6200                                                 else
6201                                                         sent = 0;
6202                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6203                                                     sent,
6204                                                     SCTP_SO_LOCKED);
6205                                                 freed_spc += ret_spc;
6206                                                 if (freed_spc >= dataout) {
6207                                                         return;
6208                                                 }
6209                                         }       /* if chunk was present */
6210                                 }       /* if of sufficient priority */
6211                         }       /* if chunk has enabled */
6212                 }               /* tailqforeach */
6213
6214                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6215                         /* Here we must move to the sent queue and mark */
6216                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6217                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6218                                         if (chk->data) {
6219                                                 /*
6220                                                  * We release the book_size
6221                                                  * if the mbuf is here
6222                                                  */
6223                                                 int ret_spc;
6224
6225                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6226                                                     0, SCTP_SO_LOCKED);
6227
6228                                                 freed_spc += ret_spc;
6229                                                 if (freed_spc >= dataout) {
6230                                                         return;
6231                                                 }
6232                                         }       /* end if chk->data */
6233                                 }       /* end if right class */
6234                         }       /* end if chk pr-sctp */
6235                 }               /* tailqforeachsafe (chk) */
6236         }                       /* if enabled in asoc */
6237 }
6238
6239 int
6240 sctp_get_frag_point(struct sctp_tcb *stcb,
6241     struct sctp_association *asoc)
6242 {
6243         int siz, ovh;
6244
6245         /*
6246          * For endpoints that have both v6 and v4 addresses we must reserve
6247          * room for the ipv6 header, for those that are only dealing with V4
6248          * we use a larger frag point.
6249          */
6250         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6251                 ovh = SCTP_MIN_OVERHEAD;
6252         } else {
6253                 ovh = SCTP_MIN_V4_OVERHEAD;
6254         }
6255         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6256         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6257                 siz = asoc->smallest_mtu - ovh;
6258         else
6259                 siz = (stcb->asoc.sctp_frag_point - ovh);
6260         /*
6261          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6262          */
6263         /* A data chunk MUST fit in a cluster */
6264         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6265         /* } */
6266
6267         /* adjust for an AUTH chunk if DATA requires auth */
6268         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6269                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6270
6271         if (siz % 4) {
6272                 /* make it an even word boundary please */
6273                 siz -= (siz % 4);
6274         }
6275         return (siz);
6276 }
6277
6278 static void
6279 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6280 {
6281         /*
6282          * We assume that the user wants PR_SCTP_TTL if the user provides a
6283          * positive lifetime but does not specify any PR_SCTP policy.
6284          */
6285         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6286                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6287         } else if (sp->timetolive > 0) {
6288                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6289                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6290         } else {
6291                 return;
6292         }
6293         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6294         case CHUNK_FLAGS_PR_SCTP_BUF:
6295                 /*
6296                  * Time to live is a priority stored in tv_sec when doing
6297                  * the buffer drop thing.
6298                  */
6299                 sp->ts.tv_sec = sp->timetolive;
6300                 sp->ts.tv_usec = 0;
6301                 break;
6302         case CHUNK_FLAGS_PR_SCTP_TTL:
6303                 {
6304                         struct timeval tv;
6305
6306                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6307                         tv.tv_sec = sp->timetolive / 1000;
6308                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6309                         /*
6310                          * TODO sctp_constants.h needs alternative time
6311                          * macros when _KERNEL is undefined.
6312                          */
6313                         timevaladd(&sp->ts, &tv);
6314                 }
6315                 break;
6316         case CHUNK_FLAGS_PR_SCTP_RTX:
6317                 /*
6318                  * Time to live is a the number or retransmissions stored in
6319                  * tv_sec.
6320                  */
6321                 sp->ts.tv_sec = sp->timetolive;
6322                 sp->ts.tv_usec = 0;
6323                 break;
6324         default:
6325                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6326                     "Unknown PR_SCTP policy %u.\n",
6327                     PR_SCTP_POLICY(sp->sinfo_flags));
6328                 break;
6329         }
6330 }
6331
6332 static int
6333 sctp_msg_append(struct sctp_tcb *stcb,
6334     struct sctp_nets *net,
6335     struct mbuf *m,
6336     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6337 {
6338         int error = 0;
6339         struct mbuf *at;
6340         struct sctp_stream_queue_pending *sp = NULL;
6341         struct sctp_stream_out *strm;
6342
6343         /*
6344          * Given an mbuf chain, put it into the association send queue and
6345          * place it on the wheel
6346          */
6347         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6348                 /* Invalid stream number */
6349                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6350                 error = EINVAL;
6351                 goto out_now;
6352         }
6353         if ((stcb->asoc.stream_locked) &&
6354             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6355                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6356                 error = EINVAL;
6357                 goto out_now;
6358         }
6359         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6360         /* Now can we send this? */
6361         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6362             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6363             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6364             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6365                 /* got data while shutting down */
6366                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6367                 error = ECONNRESET;
6368                 goto out_now;
6369         }
6370         sctp_alloc_a_strmoq(stcb, sp);
6371         if (sp == NULL) {
6372                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6373                 error = ENOMEM;
6374                 goto out_now;
6375         }
6376         sp->sinfo_flags = srcv->sinfo_flags;
6377         sp->timetolive = srcv->sinfo_timetolive;
6378         sp->ppid = srcv->sinfo_ppid;
6379         sp->context = srcv->sinfo_context;
6380         sp->fsn = 0;
6381         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6382                 sp->net = net;
6383                 atomic_add_int(&sp->net->ref_count, 1);
6384         } else {
6385                 sp->net = NULL;
6386         }
6387         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6388         sp->sid = srcv->sinfo_stream;
6389         sp->msg_is_complete = 1;
6390         sp->sender_all_done = 1;
6391         sp->some_taken = 0;
6392         sp->data = m;
6393         sp->tail_mbuf = NULL;
6394         sctp_set_prsctp_policy(sp);
6395         /*
6396          * We could in theory (for sendall) sifa the length in, but we would
6397          * still have to hunt through the chain since we need to setup the
6398          * tail_mbuf
6399          */
6400         sp->length = 0;
6401         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6402                 if (SCTP_BUF_NEXT(at) == NULL)
6403                         sp->tail_mbuf = at;
6404                 sp->length += SCTP_BUF_LEN(at);
6405         }
6406         if (srcv->sinfo_keynumber_valid) {
6407                 sp->auth_keyid = srcv->sinfo_keynumber;
6408         } else {
6409                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6410         }
6411         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6412                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6413                 sp->holds_key_ref = 1;
6414         }
6415         if (hold_stcb_lock == 0) {
6416                 SCTP_TCB_SEND_LOCK(stcb);
6417         }
6418         sctp_snd_sb_alloc(stcb, sp->length);
6419         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6420         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6421         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6422         m = NULL;
6423         if (hold_stcb_lock == 0) {
6424                 SCTP_TCB_SEND_UNLOCK(stcb);
6425         }
6426 out_now:
6427         if (m) {
6428                 sctp_m_freem(m);
6429         }
6430         return (error);
6431 }
6432
6433
6434 static struct mbuf *
6435 sctp_copy_mbufchain(struct mbuf *clonechain,
6436     struct mbuf *outchain,
6437     struct mbuf **endofchain,
6438     int can_take_mbuf,
6439     int sizeofcpy,
6440     uint8_t copy_by_ref)
6441 {
6442         struct mbuf *m;
6443         struct mbuf *appendchain;
6444         caddr_t cp;
6445         int len;
6446
6447         if (endofchain == NULL) {
6448                 /* error */
6449 error_out:
6450                 if (outchain)
6451                         sctp_m_freem(outchain);
6452                 return (NULL);
6453         }
6454         if (can_take_mbuf) {
6455                 appendchain = clonechain;
6456         } else {
6457                 if (!copy_by_ref &&
6458                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6459                     ) {
6460                         /* Its not in a cluster */
6461                         if (*endofchain == NULL) {
6462                                 /* lets get a mbuf cluster */
6463                                 if (outchain == NULL) {
6464                                         /* This is the general case */
6465                         new_mbuf:
6466                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6467                                         if (outchain == NULL) {
6468                                                 goto error_out;
6469                                         }
6470                                         SCTP_BUF_LEN(outchain) = 0;
6471                                         *endofchain = outchain;
6472                                         /* get the prepend space */
6473                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6474                                 } else {
6475                                         /*
6476                                          * We really should not get a NULL
6477                                          * in endofchain
6478                                          */
6479                                         /* find end */
6480                                         m = outchain;
6481                                         while (m) {
6482                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6483                                                         *endofchain = m;
6484                                                         break;
6485                                                 }
6486                                                 m = SCTP_BUF_NEXT(m);
6487                                         }
6488                                         /* sanity */
6489                                         if (*endofchain == NULL) {
6490                                                 /*
6491                                                  * huh, TSNH XXX maybe we
6492                                                  * should panic
6493                                                  */
6494                                                 sctp_m_freem(outchain);
6495                                                 goto new_mbuf;
6496                                         }
6497                                 }
6498                                 /* get the new end of length */
6499                                 len = (int)M_TRAILINGSPACE(*endofchain);
6500                         } else {
6501                                 /* how much is left at the end? */
6502                                 len = (int)M_TRAILINGSPACE(*endofchain);
6503                         }
6504                         /* Find the end of the data, for appending */
6505                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6506
6507                         /* Now lets copy it out */
6508                         if (len >= sizeofcpy) {
6509                                 /* It all fits, copy it in */
6510                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6511                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6512                         } else {
6513                                 /* fill up the end of the chain */
6514                                 if (len > 0) {
6515                                         m_copydata(clonechain, 0, len, cp);
6516                                         SCTP_BUF_LEN((*endofchain)) += len;
6517                                         /* now we need another one */
6518                                         sizeofcpy -= len;
6519                                 }
6520                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6521                                 if (m == NULL) {
6522                                         /* We failed */
6523                                         goto error_out;
6524                                 }
6525                                 SCTP_BUF_NEXT((*endofchain)) = m;
6526                                 *endofchain = m;
6527                                 cp = mtod((*endofchain), caddr_t);
6528                                 m_copydata(clonechain, len, sizeofcpy, cp);
6529                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6530                         }
6531                         return (outchain);
6532                 } else {
6533                         /* copy the old fashion way */
6534                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6535 #ifdef SCTP_MBUF_LOGGING
6536                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6537                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6538                         }
6539 #endif
6540                 }
6541         }
6542         if (appendchain == NULL) {
6543                 /* error */
6544                 if (outchain)
6545                         sctp_m_freem(outchain);
6546                 return (NULL);
6547         }
6548         if (outchain) {
6549                 /* tack on to the end */
6550                 if (*endofchain != NULL) {
6551                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6552                 } else {
6553                         m = outchain;
6554                         while (m) {
6555                                 if (SCTP_BUF_NEXT(m) == NULL) {
6556                                         SCTP_BUF_NEXT(m) = appendchain;
6557                                         break;
6558                                 }
6559                                 m = SCTP_BUF_NEXT(m);
6560                         }
6561                 }
6562                 /*
6563                  * save off the end and update the end-chain position
6564                  */
6565                 m = appendchain;
6566                 while (m) {
6567                         if (SCTP_BUF_NEXT(m) == NULL) {
6568                                 *endofchain = m;
6569                                 break;
6570                         }
6571                         m = SCTP_BUF_NEXT(m);
6572                 }
6573                 return (outchain);
6574         } else {
6575                 /* save off the end and update the end-chain position */
6576                 m = appendchain;
6577                 while (m) {
6578                         if (SCTP_BUF_NEXT(m) == NULL) {
6579                                 *endofchain = m;
6580                                 break;
6581                         }
6582                         m = SCTP_BUF_NEXT(m);
6583                 }
6584                 return (appendchain);
6585         }
6586 }
6587
6588 static int
6589 sctp_med_chunk_output(struct sctp_inpcb *inp,
6590     struct sctp_tcb *stcb,
6591     struct sctp_association *asoc,
6592     int *num_out,
6593     int *reason_code,
6594     int control_only, int from_where,
6595     struct timeval *now, int *now_filled, int frag_point, int so_locked
6596 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6597     SCTP_UNUSED
6598 #endif
6599 );
6600
6601 static void
6602 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6603     uint32_t val SCTP_UNUSED)
6604 {
6605         struct sctp_copy_all *ca;
6606         struct mbuf *m;
6607         int ret = 0;
6608         int added_control = 0;
6609         int un_sent, do_chunk_output = 1;
6610         struct sctp_association *asoc;
6611         struct sctp_nets *net;
6612
6613         ca = (struct sctp_copy_all *)ptr;
6614         if (ca->m == NULL) {
6615                 return;
6616         }
6617         if (ca->inp != inp) {
6618                 /* TSNH */
6619                 return;
6620         }
6621         if (ca->sndlen > 0) {
6622                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6623                 if (m == NULL) {
6624                         /* can't copy so we are done */
6625                         ca->cnt_failed++;
6626                         return;
6627                 }
6628 #ifdef SCTP_MBUF_LOGGING
6629                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6630                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6631                 }
6632 #endif
6633         } else {
6634                 m = NULL;
6635         }
6636         SCTP_TCB_LOCK_ASSERT(stcb);
6637         if (stcb->asoc.alternate) {
6638                 net = stcb->asoc.alternate;
6639         } else {
6640                 net = stcb->asoc.primary_destination;
6641         }
6642         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6643                 /* Abort this assoc with m as the user defined reason */
6644                 if (m != NULL) {
6645                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6646                 } else {
6647                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6648                             0, M_NOWAIT, 1, MT_DATA);
6649                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6650                 }
6651                 if (m != NULL) {
6652                         struct sctp_paramhdr *ph;
6653
6654                         ph = mtod(m, struct sctp_paramhdr *);
6655                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6656                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6657                 }
6658                 /*
6659                  * We add one here to keep the assoc from dis-appearing on
6660                  * us.
6661                  */
6662                 atomic_add_int(&stcb->asoc.refcnt, 1);
6663                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6664                 /*
6665                  * sctp_abort_an_association calls sctp_free_asoc() free
6666                  * association will NOT free it since we incremented the
6667                  * refcnt .. we do this to prevent it being freed and things
6668                  * getting tricky since we could end up (from free_asoc)
6669                  * calling inpcb_free which would get a recursive lock call
6670                  * to the iterator lock.. But as a consequence of that the
6671                  * stcb will return to us un-locked.. since free_asoc
6672                  * returns with either no TCB or the TCB unlocked, we must
6673                  * relock.. to unlock in the iterator timer :-0
6674                  */
6675                 SCTP_TCB_LOCK(stcb);
6676                 atomic_add_int(&stcb->asoc.refcnt, -1);
6677                 goto no_chunk_output;
6678         } else {
6679                 if (m) {
6680                         ret = sctp_msg_append(stcb, net, m,
6681                             &ca->sndrcv, 1);
6682                 }
6683                 asoc = &stcb->asoc;
6684                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6685                         /* shutdown this assoc */
6686                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6687                             TAILQ_EMPTY(&asoc->sent_queue) &&
6688                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6689                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6690                                         goto abort_anyway;
6691                                 }
6692                                 /*
6693                                  * there is nothing queued to send, so I'm
6694                                  * done...
6695                                  */
6696                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6697                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6698                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6699                                         /*
6700                                          * only send SHUTDOWN the first time
6701                                          * through
6702                                          */
6703                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6704                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6705                                         }
6706                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6707                                         sctp_stop_timers_for_shutdown(stcb);
6708                                         sctp_send_shutdown(stcb, net);
6709                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6710                                             net);
6711                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6712                                             asoc->primary_destination);
6713                                         added_control = 1;
6714                                         do_chunk_output = 0;
6715                                 }
6716                         } else {
6717                                 /*
6718                                  * we still got (or just got) data to send,
6719                                  * so set SHUTDOWN_PENDING
6720                                  */
6721                                 /*
6722                                  * XXX sockets draft says that SCTP_EOF
6723                                  * should be sent with no data.  currently,
6724                                  * we will allow user data to be sent first
6725                                  * and move to SHUTDOWN-PENDING
6726                                  */
6727                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6728                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6729                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6730                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6731                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6732                                         }
6733                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6734                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6735                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6736                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6737                                                 struct mbuf *op_err;
6738                                                 char msg[SCTP_DIAG_INFO_LEN];
6739
6740                                 abort_anyway:
6741                                                 snprintf(msg, sizeof(msg),
6742                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6743                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6744                                                     msg);
6745                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6746                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6747                                                     op_err, SCTP_SO_NOT_LOCKED);
6748                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6749                                                 goto no_chunk_output;
6750                                         }
6751                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6752                                             asoc->primary_destination);
6753                                 }
6754                         }
6755
6756                 }
6757         }
6758         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6759             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6760
6761         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6762             (stcb->asoc.total_flight > 0) &&
6763             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6764                 do_chunk_output = 0;
6765         }
6766         if (do_chunk_output)
6767                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6768         else if (added_control) {
6769                 int num_out, reason, now_filled = 0;
6770                 struct timeval now;
6771                 int frag_point;
6772
6773                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6774                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6775                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6776         }
6777 no_chunk_output:
6778         if (ret) {
6779                 ca->cnt_failed++;
6780         } else {
6781                 ca->cnt_sent++;
6782         }
6783 }
6784
6785 static void
6786 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6787 {
6788         struct sctp_copy_all *ca;
6789
6790         ca = (struct sctp_copy_all *)ptr;
6791         /*
6792          * Do a notify here? Kacheong suggests that the notify be done at
6793          * the send time.. so you would push up a notification if any send
6794          * failed. Don't know if this is feasible since the only failures we
6795          * have is "memory" related and if you cannot get an mbuf to send
6796          * the data you surely can't get an mbuf to send up to notify the
6797          * user you can't send the data :->
6798          */
6799
6800         /* now free everything */
6801         sctp_m_freem(ca->m);
6802         SCTP_FREE(ca, SCTP_M_COPYAL);
6803 }
6804
6805 static struct mbuf *
6806 sctp_copy_out_all(struct uio *uio, int len)
6807 {
6808         struct mbuf *ret, *at;
6809         int left, willcpy, cancpy, error;
6810
6811         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6812         if (ret == NULL) {
6813                 /* TSNH */
6814                 return (NULL);
6815         }
6816         left = len;
6817         SCTP_BUF_LEN(ret) = 0;
6818         /* save space for the data chunk header */
6819         cancpy = (int)M_TRAILINGSPACE(ret);
6820         willcpy = min(cancpy, left);
6821         at = ret;
6822         while (left > 0) {
6823                 /* Align data to the end */
6824                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6825                 if (error) {
6826         err_out_now:
6827                         sctp_m_freem(at);
6828                         return (NULL);
6829                 }
6830                 SCTP_BUF_LEN(at) = willcpy;
6831                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6832                 left -= willcpy;
6833                 if (left > 0) {
6834                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6835                         if (SCTP_BUF_NEXT(at) == NULL) {
6836                                 goto err_out_now;
6837                         }
6838                         at = SCTP_BUF_NEXT(at);
6839                         SCTP_BUF_LEN(at) = 0;
6840                         cancpy = (int)M_TRAILINGSPACE(at);
6841                         willcpy = min(cancpy, left);
6842                 }
6843         }
6844         return (ret);
6845 }
6846
6847 static int
6848 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6849     struct sctp_sndrcvinfo *srcv)
6850 {
6851         int ret;
6852         struct sctp_copy_all *ca;
6853
6854         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6855             SCTP_M_COPYAL);
6856         if (ca == NULL) {
6857                 sctp_m_freem(m);
6858                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6859                 return (ENOMEM);
6860         }
6861         memset(ca, 0, sizeof(struct sctp_copy_all));
6862
6863         ca->inp = inp;
6864         if (srcv) {
6865                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6866         }
6867         /*
6868          * take off the sendall flag, it would be bad if we failed to do
6869          * this :-0
6870          */
6871         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6872         /* get length and mbuf chain */
6873         if (uio) {
6874                 ca->sndlen = (int)uio->uio_resid;
6875                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6876                 if (ca->m == NULL) {
6877                         SCTP_FREE(ca, SCTP_M_COPYAL);
6878                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6879                         return (ENOMEM);
6880                 }
6881         } else {
6882                 /* Gather the length of the send */
6883                 struct mbuf *mat;
6884
6885                 ca->sndlen = 0;
6886                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6887                         ca->sndlen += SCTP_BUF_LEN(mat);
6888                 }
6889         }
6890         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6891             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6892             SCTP_ASOC_ANY_STATE,
6893             (void *)ca, 0,
6894             sctp_sendall_completes, inp, 1);
6895         if (ret) {
6896                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6897                 SCTP_FREE(ca, SCTP_M_COPYAL);
6898                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6899                 return (EFAULT);
6900         }
6901         return (0);
6902 }
6903
6904
6905 void
6906 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6907 {
6908         struct sctp_tmit_chunk *chk, *nchk;
6909
6910         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6911                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6912                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6913                         asoc->ctrl_queue_cnt--;
6914                         if (chk->data) {
6915                                 sctp_m_freem(chk->data);
6916                                 chk->data = NULL;
6917                         }
6918                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6919                 }
6920         }
6921 }
6922
6923 void
6924 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6925 {
6926         struct sctp_association *asoc;
6927         struct sctp_tmit_chunk *chk, *nchk;
6928         struct sctp_asconf_chunk *acp;
6929
6930         asoc = &stcb->asoc;
6931         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6932                 /* find SCTP_ASCONF chunk in queue */
6933                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6934                         if (chk->data) {
6935                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6936                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6937                                         /* Not Acked yet */
6938                                         break;
6939                                 }
6940                         }
6941                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6942                         asoc->ctrl_queue_cnt--;
6943                         if (chk->data) {
6944                                 sctp_m_freem(chk->data);
6945                                 chk->data = NULL;
6946                         }
6947                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6948                 }
6949         }
6950 }
6951
6952
6953 static void
6954 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6955     struct sctp_association *asoc,
6956     struct sctp_tmit_chunk **data_list,
6957     int bundle_at,
6958     struct sctp_nets *net)
6959 {
6960         int i;
6961         struct sctp_tmit_chunk *tp1;
6962
6963         for (i = 0; i < bundle_at; i++) {
6964                 /* off of the send queue */
6965                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6966                 asoc->send_queue_cnt--;
6967                 if (i > 0) {
6968                         /*
6969                          * Any chunk NOT 0 you zap the time chunk 0 gets
6970                          * zapped or set based on if a RTO measurment is
6971                          * needed.
6972                          */
6973                         data_list[i]->do_rtt = 0;
6974                 }
6975                 /* record time */
6976                 data_list[i]->sent_rcv_time = net->last_sent_time;
6977                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6978                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6979                 if (data_list[i]->whoTo == NULL) {
6980                         data_list[i]->whoTo = net;
6981                         atomic_add_int(&net->ref_count, 1);
6982                 }
6983                 /* on to the sent queue */
6984                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6985                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6986                         struct sctp_tmit_chunk *tpp;
6987
6988                         /* need to move back */
6989         back_up_more:
6990                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6991                         if (tpp == NULL) {
6992                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6993                                 goto all_done;
6994                         }
6995                         tp1 = tpp;
6996                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6997                                 goto back_up_more;
6998                         }
6999                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7000                 } else {
7001                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7002                             data_list[i],
7003                             sctp_next);
7004                 }
7005 all_done:
7006                 /* This does not lower until the cum-ack passes it */
7007                 asoc->sent_queue_cnt++;
7008                 if ((asoc->peers_rwnd <= 0) &&
7009                     (asoc->total_flight == 0) &&
7010                     (bundle_at == 1)) {
7011                         /* Mark the chunk as being a window probe */
7012                         SCTP_STAT_INCR(sctps_windowprobed);
7013                 }
7014 #ifdef SCTP_AUDITING_ENABLED
7015                 sctp_audit_log(0xC2, 3);
7016 #endif
7017                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7018                 data_list[i]->snd_count = 1;
7019                 data_list[i]->rec.data.chunk_was_revoked = 0;
7020                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7021                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7022                             data_list[i]->whoTo->flight_size,
7023                             data_list[i]->book_size,
7024                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7025                             data_list[i]->rec.data.tsn);
7026                 }
7027                 sctp_flight_size_increase(data_list[i]);
7028                 sctp_total_flight_increase(stcb, data_list[i]);
7029                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7030                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7031                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7032                 }
7033                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7034                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7035                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7036                         /* SWS sender side engages */
7037                         asoc->peers_rwnd = 0;
7038                 }
7039         }
7040         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7041                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7042         }
7043 }
7044
7045 static void
7046 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7047 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7048     SCTP_UNUSED
7049 #endif
7050 )
7051 {
7052         struct sctp_tmit_chunk *chk, *nchk;
7053
7054         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7055                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7056                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7057                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7058                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7059                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7060                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7061                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7062                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7063                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7064                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7065                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7066                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7067                         /* Stray chunks must be cleaned up */
7068         clean_up_anyway:
7069                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7070                         asoc->ctrl_queue_cnt--;
7071                         if (chk->data) {
7072                                 sctp_m_freem(chk->data);
7073                                 chk->data = NULL;
7074                         }
7075                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7076                                 asoc->fwd_tsn_cnt--;
7077                         }
7078                         sctp_free_a_chunk(stcb, chk, so_locked);
7079                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7080                         /* special handling, we must look into the param */
7081                         if (chk != asoc->str_reset) {
7082                                 goto clean_up_anyway;
7083                         }
7084                 }
7085         }
7086 }
7087
7088 static uint32_t
7089 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7090     uint32_t space_left, uint32_t frag_point, int eeor_on)
7091 {
7092         /*
7093          * Make a decision on if I should split a msg into multiple parts.
7094          * This is only asked of incomplete messages.
7095          */
7096         if (eeor_on) {
7097                 /*
7098                  * If we are doing EEOR we need to always send it if its the
7099                  * entire thing, since it might be all the guy is putting in
7100                  * the hopper.
7101                  */
7102                 if (space_left >= length) {
7103                         /*-
7104                          * If we have data outstanding,
7105                          * we get another chance when the sack
7106                          * arrives to transmit - wait for more data
7107                          */
7108                         if (stcb->asoc.total_flight == 0) {
7109                                 /*
7110                                  * If nothing is in flight, we zero the
7111                                  * packet counter.
7112                                  */
7113                                 return (length);
7114                         }
7115                         return (0);
7116
7117                 } else {
7118                         /* You can fill the rest */
7119                         return (space_left);
7120                 }
7121         }
7122         /*-
7123          * For those strange folk that make the send buffer
7124          * smaller than our fragmentation point, we can't
7125          * get a full msg in so we have to allow splitting.
7126          */
7127         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7128                 return (length);
7129         }
7130         if ((length <= space_left) ||
7131             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7132                 /* Sub-optimial residual don't split in non-eeor mode. */
7133                 return (0);
7134         }
7135         /*
7136          * If we reach here length is larger than the space_left. Do we wish
7137          * to split it for the sake of packet putting together?
7138          */
7139         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7140                 /* Its ok to split it */
7141                 return (min(space_left, frag_point));
7142         }
7143         /* Nope, can't split */
7144         return (0);
7145 }
7146
7147 static uint32_t
7148 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7149     struct sctp_stream_out *strq,
7150     uint32_t space_left,
7151     uint32_t frag_point,
7152     int *giveup,
7153     int eeor_mode,
7154     int *bail,
7155     int so_locked
7156 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7157     SCTP_UNUSED
7158 #endif
7159 )
7160 {
7161         /* Move from the stream to the send_queue keeping track of the total */
7162         struct sctp_association *asoc;
7163         struct sctp_stream_queue_pending *sp;
7164         struct sctp_tmit_chunk *chk;
7165         struct sctp_data_chunk *dchkh = NULL;
7166         struct sctp_idata_chunk *ndchkh = NULL;
7167         uint32_t to_move, length;
7168         int leading;
7169         uint8_t rcv_flags = 0;
7170         uint8_t some_taken;
7171         uint8_t send_lock_up = 0;
7172
7173         SCTP_TCB_LOCK_ASSERT(stcb);
7174         asoc = &stcb->asoc;
7175 one_more_time:
7176         /* sa_ignore FREED_MEMORY */
7177         sp = TAILQ_FIRST(&strq->outqueue);
7178         if (sp == NULL) {
7179                 if (send_lock_up == 0) {
7180                         SCTP_TCB_SEND_LOCK(stcb);
7181                         send_lock_up = 1;
7182                 }
7183                 sp = TAILQ_FIRST(&strq->outqueue);
7184                 if (sp) {
7185                         goto one_more_time;
7186                 }
7187                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7188                     (stcb->asoc.idata_supported == 0) &&
7189                     (strq->last_msg_incomplete)) {
7190                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7191                             strq->sid,
7192                             strq->last_msg_incomplete);
7193                         strq->last_msg_incomplete = 0;
7194                 }
7195                 to_move = 0;
7196                 if (send_lock_up) {
7197                         SCTP_TCB_SEND_UNLOCK(stcb);
7198                         send_lock_up = 0;
7199                 }
7200                 goto out_of;
7201         }
7202         if ((sp->msg_is_complete) && (sp->length == 0)) {
7203                 if (sp->sender_all_done) {
7204                         /*
7205                          * We are doing deferred cleanup. Last time through
7206                          * when we took all the data the sender_all_done was
7207                          * not set.
7208                          */
7209                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7210                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7211                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7212                                     sp->sender_all_done,
7213                                     sp->length,
7214                                     sp->msg_is_complete,
7215                                     sp->put_last_out,
7216                                     send_lock_up);
7217                         }
7218                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7219                                 SCTP_TCB_SEND_LOCK(stcb);
7220                                 send_lock_up = 1;
7221                         }
7222                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7223                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7224                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7225                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7226                             (strq->chunks_on_queues == 0) &&
7227                             TAILQ_EMPTY(&strq->outqueue)) {
7228                                 stcb->asoc.trigger_reset = 1;
7229                         }
7230                         if (sp->net) {
7231                                 sctp_free_remote_addr(sp->net);
7232                                 sp->net = NULL;
7233                         }
7234                         if (sp->data) {
7235                                 sctp_m_freem(sp->data);
7236                                 sp->data = NULL;
7237                         }
7238                         sctp_free_a_strmoq(stcb, sp, so_locked);
7239                         /* we can't be locked to it */
7240                         if (send_lock_up) {
7241                                 SCTP_TCB_SEND_UNLOCK(stcb);
7242                                 send_lock_up = 0;
7243                         }
7244                         /* back to get the next msg */
7245                         goto one_more_time;
7246                 } else {
7247                         /*
7248                          * sender just finished this but still holds a
7249                          * reference
7250                          */
7251                         *giveup = 1;
7252                         to_move = 0;
7253                         goto out_of;
7254                 }
7255         } else {
7256                 /* is there some to get */
7257                 if (sp->length == 0) {
7258                         /* no */
7259                         *giveup = 1;
7260                         to_move = 0;
7261                         goto out_of;
7262                 } else if (sp->discard_rest) {
7263                         if (send_lock_up == 0) {
7264                                 SCTP_TCB_SEND_LOCK(stcb);
7265                                 send_lock_up = 1;
7266                         }
7267                         /* Whack down the size */
7268                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7269                         if ((stcb->sctp_socket != NULL) &&
7270                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7271                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7272                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7273                         }
7274                         if (sp->data) {
7275                                 sctp_m_freem(sp->data);
7276                                 sp->data = NULL;
7277                                 sp->tail_mbuf = NULL;
7278                         }
7279                         sp->length = 0;
7280                         sp->some_taken = 1;
7281                         *giveup = 1;
7282                         to_move = 0;
7283                         goto out_of;
7284                 }
7285         }
7286         some_taken = sp->some_taken;
7287 re_look:
7288         length = sp->length;
7289         if (sp->msg_is_complete) {
7290                 /* The message is complete */
7291                 to_move = min(length, frag_point);
7292                 if (to_move == length) {
7293                         /* All of it fits in the MTU */
7294                         if (sp->some_taken) {
7295                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7296                         } else {
7297                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7298                         }
7299                         sp->put_last_out = 1;
7300                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7301                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7302                         }
7303                 } else {
7304                         /* Not all of it fits, we fragment */
7305                         if (sp->some_taken == 0) {
7306                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7307                         }
7308                         sp->some_taken = 1;
7309                 }
7310         } else {
7311                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7312                 if (to_move) {
7313                         /*-
7314                          * We use a snapshot of length in case it
7315                          * is expanding during the compare.
7316                          */
7317                         uint32_t llen;
7318
7319                         llen = length;
7320                         if (to_move >= llen) {
7321                                 to_move = llen;
7322                                 if (send_lock_up == 0) {
7323                                         /*-
7324                                          * We are taking all of an incomplete msg
7325                                          * thus we need a send lock.
7326                                          */
7327                                         SCTP_TCB_SEND_LOCK(stcb);
7328                                         send_lock_up = 1;
7329                                         if (sp->msg_is_complete) {
7330                                                 /*
7331                                                  * the sender finished the
7332                                                  * msg
7333                                                  */
7334                                                 goto re_look;
7335                                         }
7336                                 }
7337                         }
7338                         if (sp->some_taken == 0) {
7339                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7340                                 sp->some_taken = 1;
7341                         }
7342                 } else {
7343                         /* Nothing to take. */
7344                         *giveup = 1;
7345                         to_move = 0;
7346                         goto out_of;
7347                 }
7348         }
7349
7350         /* If we reach here, we can copy out a chunk */
7351         sctp_alloc_a_chunk(stcb, chk);
7352         if (chk == NULL) {
7353                 /* No chunk memory */
7354                 *giveup = 1;
7355                 to_move = 0;
7356                 goto out_of;
7357         }
7358         /*
7359          * Setup for unordered if needed by looking at the user sent info
7360          * flags.
7361          */
7362         if (sp->sinfo_flags & SCTP_UNORDERED) {
7363                 rcv_flags |= SCTP_DATA_UNORDERED;
7364         }
7365         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7366             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7367                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7368         }
7369         /* clear out the chunk before setting up */
7370         memset(chk, 0, sizeof(*chk));
7371         chk->rec.data.rcv_flags = rcv_flags;
7372
7373         if (to_move >= length) {
7374                 /* we think we can steal the whole thing */
7375                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7376                         SCTP_TCB_SEND_LOCK(stcb);
7377                         send_lock_up = 1;
7378                 }
7379                 if (to_move < sp->length) {
7380                         /* bail, it changed */
7381                         goto dont_do_it;
7382                 }
7383                 chk->data = sp->data;
7384                 chk->last_mbuf = sp->tail_mbuf;
7385                 /* register the stealing */
7386                 sp->data = sp->tail_mbuf = NULL;
7387         } else {
7388                 struct mbuf *m;
7389
7390 dont_do_it:
7391                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7392                 chk->last_mbuf = NULL;
7393                 if (chk->data == NULL) {
7394                         sp->some_taken = some_taken;
7395                         sctp_free_a_chunk(stcb, chk, so_locked);
7396                         *bail = 1;
7397                         to_move = 0;
7398                         goto out_of;
7399                 }
7400 #ifdef SCTP_MBUF_LOGGING
7401                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7402                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7403                 }
7404 #endif
7405                 /* Pull off the data */
7406                 m_adj(sp->data, to_move);
7407                 /* Now lets work our way down and compact it */
7408                 m = sp->data;
7409                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7410                         sp->data = SCTP_BUF_NEXT(m);
7411                         SCTP_BUF_NEXT(m) = NULL;
7412                         if (sp->tail_mbuf == m) {
7413                                 /*-
7414                                  * Freeing tail? TSNH since
7415                                  * we supposedly were taking less
7416                                  * than the sp->length.
7417                                  */
7418 #ifdef INVARIANTS
7419                                 panic("Huh, freing tail? - TSNH");
7420 #else
7421                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7422                                 sp->tail_mbuf = sp->data = NULL;
7423                                 sp->length = 0;
7424 #endif
7425
7426                         }
7427                         sctp_m_free(m);
7428                         m = sp->data;
7429                 }
7430         }
7431         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7432                 chk->copy_by_ref = 1;
7433         } else {
7434                 chk->copy_by_ref = 0;
7435         }
7436         /*
7437          * get last_mbuf and counts of mb usage This is ugly but hopefully
7438          * its only one mbuf.
7439          */
7440         if (chk->last_mbuf == NULL) {
7441                 chk->last_mbuf = chk->data;
7442                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7443                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7444                 }
7445         }
7446
7447         if (to_move > length) {
7448                 /*- This should not happen either
7449                  * since we always lower to_move to the size
7450                  * of sp->length if its larger.
7451                  */
7452 #ifdef INVARIANTS
7453                 panic("Huh, how can to_move be larger?");
7454 #else
7455                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7456                 sp->length = 0;
7457 #endif
7458         } else {
7459                 atomic_subtract_int(&sp->length, to_move);
7460         }
7461         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7462         if (M_LEADINGSPACE(chk->data) < leading) {
7463                 /* Not enough room for a chunk header, get some */
7464                 struct mbuf *m;
7465
7466                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7467                 if (m == NULL) {
7468                         /*
7469                          * we're in trouble here. _PREPEND below will free
7470                          * all the data if there is no leading space, so we
7471                          * must put the data back and restore.
7472                          */
7473                         if (send_lock_up == 0) {
7474                                 SCTP_TCB_SEND_LOCK(stcb);
7475                                 send_lock_up = 1;
7476                         }
7477                         if (sp->data == NULL) {
7478                                 /* unsteal the data */
7479                                 sp->data = chk->data;
7480                                 sp->tail_mbuf = chk->last_mbuf;
7481                         } else {
7482                                 struct mbuf *m_tmp;
7483
7484                                 /* reassemble the data */
7485                                 m_tmp = sp->data;
7486                                 sp->data = chk->data;
7487                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7488                         }
7489                         sp->some_taken = some_taken;
7490                         atomic_add_int(&sp->length, to_move);
7491                         chk->data = NULL;
7492                         *bail = 1;
7493                         sctp_free_a_chunk(stcb, chk, so_locked);
7494                         to_move = 0;
7495                         goto out_of;
7496                 } else {
7497                         SCTP_BUF_LEN(m) = 0;
7498                         SCTP_BUF_NEXT(m) = chk->data;
7499                         chk->data = m;
7500                         M_ALIGN(chk->data, 4);
7501                 }
7502         }
7503         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7504         if (chk->data == NULL) {
7505                 /* HELP, TSNH since we assured it would not above? */
7506 #ifdef INVARIANTS
7507                 panic("prepend failes HELP?");
7508 #else
7509                 SCTP_PRINTF("prepend fails HELP?\n");
7510                 sctp_free_a_chunk(stcb, chk, so_locked);
7511 #endif
7512                 *bail = 1;
7513                 to_move = 0;
7514                 goto out_of;
7515         }
7516         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7517         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7518         chk->book_size_scale = 0;
7519         chk->sent = SCTP_DATAGRAM_UNSENT;
7520
7521         chk->flags = 0;
7522         chk->asoc = &stcb->asoc;
7523         chk->pad_inplace = 0;
7524         chk->no_fr_allowed = 0;
7525         if (stcb->asoc.idata_supported == 0) {
7526                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7527                         /* Just use 0. The receiver ignores the values. */
7528                         chk->rec.data.mid = 0;
7529                 } else {
7530                         chk->rec.data.mid = strq->next_mid_ordered;
7531                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7532                                 strq->next_mid_ordered++;
7533                         }
7534                 }
7535         } else {
7536                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7537                         chk->rec.data.mid = strq->next_mid_unordered;
7538                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7539                                 strq->next_mid_unordered++;
7540                         }
7541                 } else {
7542                         chk->rec.data.mid = strq->next_mid_ordered;
7543                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7544                                 strq->next_mid_ordered++;
7545                         }
7546                 }
7547         }
7548         chk->rec.data.sid = sp->sid;
7549         chk->rec.data.ppid = sp->ppid;
7550         chk->rec.data.context = sp->context;
7551         chk->rec.data.doing_fast_retransmit = 0;
7552
7553         chk->rec.data.timetodrop = sp->ts;
7554         chk->flags = sp->act_flags;
7555
7556         if (sp->net) {
7557                 chk->whoTo = sp->net;
7558                 atomic_add_int(&chk->whoTo->ref_count, 1);
7559         } else
7560                 chk->whoTo = NULL;
7561
7562         if (sp->holds_key_ref) {
7563                 chk->auth_keyid = sp->auth_keyid;
7564                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7565                 chk->holds_key_ref = 1;
7566         }
7567         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7568         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7569                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7570                     (uint32_t)(uintptr_t)stcb, sp->length,
7571                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7572                     chk->rec.data.tsn);
7573         }
7574         if (stcb->asoc.idata_supported == 0) {
7575                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7576         } else {
7577                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7578         }
7579         /*
7580          * Put the rest of the things in place now. Size was done earlier in
7581          * previous loop prior to padding.
7582          */
7583
7584 #ifdef SCTP_ASOCLOG_OF_TSNS
7585         SCTP_TCB_LOCK_ASSERT(stcb);
7586         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7587                 asoc->tsn_out_at = 0;
7588                 asoc->tsn_out_wrapped = 1;
7589         }
7590         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7591         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7592         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7593         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7594         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7595         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7596         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7597         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7598         asoc->tsn_out_at++;
7599 #endif
7600         if (stcb->asoc.idata_supported == 0) {
7601                 dchkh->ch.chunk_type = SCTP_DATA;
7602                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7603                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7604                 dchkh->dp.sid = htons(strq->sid);
7605                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7606                 dchkh->dp.ppid = chk->rec.data.ppid;
7607                 dchkh->ch.chunk_length = htons(chk->send_size);
7608         } else {
7609                 ndchkh->ch.chunk_type = SCTP_IDATA;
7610                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7611                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7612                 ndchkh->dp.sid = htons(strq->sid);
7613                 ndchkh->dp.reserved = htons(0);
7614                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7615                 if (sp->fsn == 0)
7616                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7617                 else
7618                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7619                 sp->fsn++;
7620                 ndchkh->ch.chunk_length = htons(chk->send_size);
7621         }
7622         /* Now advance the chk->send_size by the actual pad needed. */
7623         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7624                 /* need a pad */
7625                 struct mbuf *lm;
7626                 int pads;
7627
7628                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7629                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7630                 if (lm != NULL) {
7631                         chk->last_mbuf = lm;
7632                         chk->pad_inplace = 1;
7633                 }
7634                 chk->send_size += pads;
7635         }
7636         if (PR_SCTP_ENABLED(chk->flags)) {
7637                 asoc->pr_sctp_cnt++;
7638         }
7639         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7640                 /* All done pull and kill the message */
7641                 if (sp->put_last_out == 0) {
7642                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7643                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7644                             sp->sender_all_done,
7645                             sp->length,
7646                             sp->msg_is_complete,
7647                             sp->put_last_out,
7648                             send_lock_up);
7649                 }
7650                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7651                         SCTP_TCB_SEND_LOCK(stcb);
7652                         send_lock_up = 1;
7653                 }
7654                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7655                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7656                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7657                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7658                     (strq->chunks_on_queues == 0) &&
7659                     TAILQ_EMPTY(&strq->outqueue)) {
7660                         stcb->asoc.trigger_reset = 1;
7661                 }
7662                 if (sp->net) {
7663                         sctp_free_remote_addr(sp->net);
7664                         sp->net = NULL;
7665                 }
7666                 if (sp->data) {
7667                         sctp_m_freem(sp->data);
7668                         sp->data = NULL;
7669                 }
7670                 sctp_free_a_strmoq(stcb, sp, so_locked);
7671         }
7672         asoc->chunks_on_out_queue++;
7673         strq->chunks_on_queues++;
7674         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7675         asoc->send_queue_cnt++;
7676 out_of:
7677         if (send_lock_up) {
7678                 SCTP_TCB_SEND_UNLOCK(stcb);
7679         }
7680         return (to_move);
7681 }
7682
7683
7684 static void
7685 sctp_fill_outqueue(struct sctp_tcb *stcb,
7686     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7687 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7688     SCTP_UNUSED
7689 #endif
7690 )
7691 {
7692         struct sctp_association *asoc;
7693         struct sctp_stream_out *strq;
7694         uint32_t space_left, moved, total_moved;
7695         int bail, giveup;
7696
7697         SCTP_TCB_LOCK_ASSERT(stcb);
7698         asoc = &stcb->asoc;
7699         total_moved = 0;
7700         switch (net->ro._l_addr.sa.sa_family) {
7701 #ifdef INET
7702         case AF_INET:
7703                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7704                 break;
7705 #endif
7706 #ifdef INET6
7707         case AF_INET6:
7708                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7709                 break;
7710 #endif
7711         default:
7712                 /* TSNH */
7713                 space_left = net->mtu;
7714                 break;
7715         }
7716         /* Need an allowance for the data chunk header too */
7717         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7718
7719         /* must make even word boundary */
7720         space_left &= 0xfffffffc;
7721         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7722         giveup = 0;
7723         bail = 0;
7724         while ((space_left > 0) && (strq != NULL)) {
7725                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7726                     &giveup, eeor_mode, &bail, so_locked);
7727                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7728                 if ((giveup != 0) || (bail != 0)) {
7729                         break;
7730                 }
7731                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7732                 total_moved += moved;
7733                 space_left -= moved;
7734                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7735                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7736                 } else {
7737                         space_left = 0;
7738                 }
7739                 space_left &= 0xfffffffc;
7740         }
7741         if (bail != 0)
7742                 *quit_now = 1;
7743
7744         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7745
7746         if (total_moved == 0) {
7747                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7748                     (net == stcb->asoc.primary_destination)) {
7749                         /* ran dry for primary network net */
7750                         SCTP_STAT_INCR(sctps_primary_randry);
7751                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7752                         /* ran dry with CMT on */
7753                         SCTP_STAT_INCR(sctps_cmt_randry);
7754                 }
7755         }
7756 }
7757
7758 void
7759 sctp_fix_ecn_echo(struct sctp_association *asoc)
7760 {
7761         struct sctp_tmit_chunk *chk;
7762
7763         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7764                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7765                         chk->sent = SCTP_DATAGRAM_UNSENT;
7766                 }
7767         }
7768 }
7769
7770 void
7771 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7772 {
7773         struct sctp_association *asoc;
7774         struct sctp_tmit_chunk *chk;
7775         struct sctp_stream_queue_pending *sp;
7776         unsigned int i;
7777
7778         if (net == NULL) {
7779                 return;
7780         }
7781         asoc = &stcb->asoc;
7782         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7783                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7784                         if (sp->net == net) {
7785                                 sctp_free_remote_addr(sp->net);
7786                                 sp->net = NULL;
7787                         }
7788                 }
7789         }
7790         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7791                 if (chk->whoTo == net) {
7792                         sctp_free_remote_addr(chk->whoTo);
7793                         chk->whoTo = NULL;
7794                 }
7795         }
7796 }
7797
7798 int
7799 sctp_med_chunk_output(struct sctp_inpcb *inp,
7800     struct sctp_tcb *stcb,
7801     struct sctp_association *asoc,
7802     int *num_out,
7803     int *reason_code,
7804     int control_only, int from_where,
7805     struct timeval *now, int *now_filled, int frag_point, int so_locked
7806 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7807     SCTP_UNUSED
7808 #endif
7809 )
7810 {
7811         /**
7812          * Ok this is the generic chunk service queue. we must do the
7813          * following:
7814          * - Service the stream queue that is next, moving any
7815          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7816          *   LAST to the out queue in one pass) and assigning TSN's. This
7817          *   only applys though if the peer does not support NDATA. For NDATA
7818          *   chunks its ok to not send the entire message ;-)
7819          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7820          *   fomulate and send the low level chunks. Making sure to combine
7821          *   any control in the control chunk queue also.
7822          */
7823         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7824         struct mbuf *outchain, *endoutchain;
7825         struct sctp_tmit_chunk *chk, *nchk;
7826
7827         /* temp arrays for unlinking */
7828         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7829         int no_fragmentflg, error;
7830         unsigned int max_rwnd_per_dest, max_send_per_dest;
7831         int one_chunk, hbflag, skip_data_for_this_net;
7832         int asconf, cookie, no_out_cnt;
7833         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7834         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7835         int tsns_sent = 0;
7836         uint32_t auth_offset = 0;
7837         struct sctp_auth_chunk *auth = NULL;
7838         uint16_t auth_keyid;
7839         int override_ok = 1;
7840         int skip_fill_up = 0;
7841         int data_auth_reqd = 0;
7842
7843         /*
7844          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7845          * destination.
7846          */
7847         int quit_now = 0;
7848
7849         *num_out = 0;
7850         *reason_code = 0;
7851         auth_keyid = stcb->asoc.authinfo.active_keyid;
7852         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7853             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7854             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7855                 eeor_mode = 1;
7856         } else {
7857                 eeor_mode = 0;
7858         }
7859         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7860         /*
7861          * First lets prime the pump. For each destination, if there is room
7862          * in the flight size, attempt to pull an MTU's worth out of the
7863          * stream queues into the general send_queue
7864          */
7865 #ifdef SCTP_AUDITING_ENABLED
7866         sctp_audit_log(0xC2, 2);
7867 #endif
7868         SCTP_TCB_LOCK_ASSERT(stcb);
7869         hbflag = 0;
7870         if (control_only)
7871                 no_data_chunks = 1;
7872         else
7873                 no_data_chunks = 0;
7874
7875         /* Nothing to possible to send? */
7876         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7877             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7878             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7879             TAILQ_EMPTY(&asoc->send_queue) &&
7880             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7881 nothing_to_send:
7882                 *reason_code = 9;
7883                 return (0);
7884         }
7885         if (asoc->peers_rwnd == 0) {
7886                 /* No room in peers rwnd */
7887                 *reason_code = 1;
7888                 if (asoc->total_flight > 0) {
7889                         /* we are allowed one chunk in flight */
7890                         no_data_chunks = 1;
7891                 }
7892         }
7893         if (stcb->asoc.ecn_echo_cnt_onq) {
7894                 /* Record where a sack goes, if any */
7895                 if (no_data_chunks &&
7896                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7897                         /* Nothing but ECNe to send - we don't do that */
7898                         goto nothing_to_send;
7899                 }
7900                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7901                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7902                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7903                                 sack_goes_to = chk->whoTo;
7904                                 break;
7905                         }
7906                 }
7907         }
7908         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7909         if (stcb->sctp_socket)
7910                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7911         else
7912                 max_send_per_dest = 0;
7913         if (no_data_chunks == 0) {
7914                 /* How many non-directed chunks are there? */
7915                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7916                         if (chk->whoTo == NULL) {
7917                                 /*
7918                                  * We already have non-directed chunks on
7919                                  * the queue, no need to do a fill-up.
7920                                  */
7921                                 skip_fill_up = 1;
7922                                 break;
7923                         }
7924                 }
7925
7926         }
7927         if ((no_data_chunks == 0) &&
7928             (skip_fill_up == 0) &&
7929             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7930                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7931                         /*
7932                          * This for loop we are in takes in each net, if
7933                          * its's got space in cwnd and has data sent to it
7934                          * (when CMT is off) then it calls
7935                          * sctp_fill_outqueue for the net. This gets data on
7936                          * the send queue for that network.
7937                          *
7938                          * In sctp_fill_outqueue TSN's are assigned and data
7939                          * is copied out of the stream buffers. Note mostly
7940                          * copy by reference (we hope).
7941                          */
7942                         net->window_probe = 0;
7943                         if ((net != stcb->asoc.alternate) &&
7944                             ((net->dest_state & SCTP_ADDR_PF) ||
7945                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7946                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7947                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7948                                         sctp_log_cwnd(stcb, net, 1,
7949                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7950                                 }
7951                                 continue;
7952                         }
7953                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7954                             (net->flight_size == 0)) {
7955                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7956                         }
7957                         if (net->flight_size >= net->cwnd) {
7958                                 /* skip this network, no room - can't fill */
7959                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7960                                         sctp_log_cwnd(stcb, net, 3,
7961                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7962                                 }
7963                                 continue;
7964                         }
7965                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7966                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7967                         }
7968                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7969                         if (quit_now) {
7970                                 /* memory alloc failure */
7971                                 no_data_chunks = 1;
7972                                 break;
7973                         }
7974                 }
7975         }
7976         /* now service each destination and send out what we can for it */
7977         /* Nothing to send? */
7978         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7979             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7980             TAILQ_EMPTY(&asoc->send_queue)) {
7981                 *reason_code = 8;
7982                 return (0);
7983         }
7984
7985         if (asoc->sctp_cmt_on_off > 0) {
7986                 /* get the last start point */
7987                 start_at = asoc->last_net_cmt_send_started;
7988                 if (start_at == NULL) {
7989                         /* null so to beginning */
7990                         start_at = TAILQ_FIRST(&asoc->nets);
7991                 } else {
7992                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7993                         if (start_at == NULL) {
7994                                 start_at = TAILQ_FIRST(&asoc->nets);
7995                         }
7996                 }
7997                 asoc->last_net_cmt_send_started = start_at;
7998         } else {
7999                 start_at = TAILQ_FIRST(&asoc->nets);
8000         }
8001         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8002                 if (chk->whoTo == NULL) {
8003                         if (asoc->alternate) {
8004                                 chk->whoTo = asoc->alternate;
8005                         } else {
8006                                 chk->whoTo = asoc->primary_destination;
8007                         }
8008                         atomic_add_int(&chk->whoTo->ref_count, 1);
8009                 }
8010         }
8011         old_start_at = NULL;
8012 again_one_more_time:
8013         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8014                 /* how much can we send? */
8015                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8016                 if (old_start_at && (old_start_at == net)) {
8017                         /* through list ocmpletely. */
8018                         break;
8019                 }
8020                 tsns_sent = 0xa;
8021                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8022                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8023                     (net->flight_size >= net->cwnd)) {
8024                         /*
8025                          * Nothing on control or asconf and flight is full,
8026                          * we can skip even in the CMT case.
8027                          */
8028                         continue;
8029                 }
8030                 bundle_at = 0;
8031                 endoutchain = outchain = NULL;
8032                 no_fragmentflg = 1;
8033                 one_chunk = 0;
8034                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8035                         skip_data_for_this_net = 1;
8036                 } else {
8037                         skip_data_for_this_net = 0;
8038                 }
8039                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8040 #ifdef INET
8041                 case AF_INET:
8042                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8043                         break;
8044 #endif
8045 #ifdef INET6
8046                 case AF_INET6:
8047                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8048                         break;
8049 #endif
8050                 default:
8051                         /* TSNH */
8052                         mtu = net->mtu;
8053                         break;
8054                 }
8055                 mx_mtu = mtu;
8056                 to_out = 0;
8057                 if (mtu > asoc->peers_rwnd) {
8058                         if (asoc->total_flight > 0) {
8059                                 /* We have a packet in flight somewhere */
8060                                 r_mtu = asoc->peers_rwnd;
8061                         } else {
8062                                 /* We are always allowed to send one MTU out */
8063                                 one_chunk = 1;
8064                                 r_mtu = mtu;
8065                         }
8066                 } else {
8067                         r_mtu = mtu;
8068                 }
8069                 error = 0;
8070                 /************************/
8071                 /* ASCONF transmission */
8072                 /************************/
8073                 /* Now first lets go through the asconf queue */
8074                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8075                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8076                                 continue;
8077                         }
8078                         if (chk->whoTo == NULL) {
8079                                 if (asoc->alternate == NULL) {
8080                                         if (asoc->primary_destination != net) {
8081                                                 break;
8082                                         }
8083                                 } else {
8084                                         if (asoc->alternate != net) {
8085                                                 break;
8086                                         }
8087                                 }
8088                         } else {
8089                                 if (chk->whoTo != net) {
8090                                         break;
8091                                 }
8092                         }
8093                         if (chk->data == NULL) {
8094                                 break;
8095                         }
8096                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8097                             chk->sent != SCTP_DATAGRAM_RESEND) {
8098                                 break;
8099                         }
8100                         /*
8101                          * if no AUTH is yet included and this chunk
8102                          * requires it, make sure to account for it.  We
8103                          * don't apply the size until the AUTH chunk is
8104                          * actually added below in case there is no room for
8105                          * this chunk. NOTE: we overload the use of "omtu"
8106                          * here
8107                          */
8108                         if ((auth == NULL) &&
8109                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8110                             stcb->asoc.peer_auth_chunks)) {
8111                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8112                         } else
8113                                 omtu = 0;
8114                         /* Here we do NOT factor the r_mtu */
8115                         if ((chk->send_size < (int)(mtu - omtu)) ||
8116                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8117                                 /*
8118                                  * We probably should glom the mbuf chain
8119                                  * from the chk->data for control but the
8120                                  * problem is it becomes yet one more level
8121                                  * of tracking to do if for some reason
8122                                  * output fails. Then I have got to
8123                                  * reconstruct the merged control chain.. el
8124                                  * yucko.. for now we take the easy way and
8125                                  * do the copy
8126                                  */
8127                                 /*
8128                                  * Add an AUTH chunk, if chunk requires it
8129                                  * save the offset into the chain for AUTH
8130                                  */
8131                                 if ((auth == NULL) &&
8132                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8133                                     stcb->asoc.peer_auth_chunks))) {
8134                                         outchain = sctp_add_auth_chunk(outchain,
8135                                             &endoutchain,
8136                                             &auth,
8137                                             &auth_offset,
8138                                             stcb,
8139                                             chk->rec.chunk_id.id);
8140                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8141                                 }
8142                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8143                                     (int)chk->rec.chunk_id.can_take_data,
8144                                     chk->send_size, chk->copy_by_ref);
8145                                 if (outchain == NULL) {
8146                                         *reason_code = 8;
8147                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8148                                         return (ENOMEM);
8149                                 }
8150                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8151                                 /* update our MTU size */
8152                                 if (mtu > (chk->send_size + omtu))
8153                                         mtu -= (chk->send_size + omtu);
8154                                 else
8155                                         mtu = 0;
8156                                 to_out += (chk->send_size + omtu);
8157                                 /* Do clear IP_DF ? */
8158                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8159                                         no_fragmentflg = 0;
8160                                 }
8161                                 if (chk->rec.chunk_id.can_take_data)
8162                                         chk->data = NULL;
8163                                 /*
8164                                  * set hb flag since we can use these for
8165                                  * RTO
8166                                  */
8167                                 hbflag = 1;
8168                                 asconf = 1;
8169                                 /*
8170                                  * should sysctl this: don't bundle data
8171                                  * with ASCONF since it requires AUTH
8172                                  */
8173                                 no_data_chunks = 1;
8174                                 chk->sent = SCTP_DATAGRAM_SENT;
8175                                 if (chk->whoTo == NULL) {
8176                                         chk->whoTo = net;
8177                                         atomic_add_int(&net->ref_count, 1);
8178                                 }
8179                                 chk->snd_count++;
8180                                 if (mtu == 0) {
8181                                         /*
8182                                          * Ok we are out of room but we can
8183                                          * output without effecting the
8184                                          * flight size since this little guy
8185                                          * is a control only packet.
8186                                          */
8187                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8188                                         /*
8189                                          * do NOT clear the asconf flag as
8190                                          * it is used to do appropriate
8191                                          * source address selection.
8192                                          */
8193                                         if (*now_filled == 0) {
8194                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8195                                                 *now_filled = 1;
8196                                         }
8197                                         net->last_sent_time = *now;
8198                                         hbflag = 0;
8199                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8200                                             (struct sockaddr *)&net->ro._l_addr,
8201                                             outchain, auth_offset, auth,
8202                                             stcb->asoc.authinfo.active_keyid,
8203                                             no_fragmentflg, 0, asconf,
8204                                             inp->sctp_lport, stcb->rport,
8205                                             htonl(stcb->asoc.peer_vtag),
8206                                             net->port, NULL,
8207                                             0, 0,
8208                                             so_locked))) {
8209                                                 /*
8210                                                  * error, we could not
8211                                                  * output
8212                                                  */
8213                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8214                                                 if (from_where == 0) {
8215                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8216                                                 }
8217                                                 if (error == ENOBUFS) {
8218                                                         asoc->ifp_had_enobuf = 1;
8219                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8220                                                 }
8221                                                 /* error, could not output */
8222                                                 if (error == EHOSTUNREACH) {
8223                                                         /*
8224                                                          * Destination went
8225                                                          * unreachable
8226                                                          * during this send
8227                                                          */
8228                                                         sctp_move_chunks_from_net(stcb, net);
8229                                                 }
8230                                                 *reason_code = 7;
8231                                                 break;
8232                                         } else {
8233                                                 asoc->ifp_had_enobuf = 0;
8234                                         }
8235                                         /*
8236                                          * increase the number we sent, if a
8237                                          * cookie is sent we don't tell them
8238                                          * any was sent out.
8239                                          */
8240                                         outchain = endoutchain = NULL;
8241                                         auth = NULL;
8242                                         auth_offset = 0;
8243                                         if (!no_out_cnt)
8244                                                 *num_out += ctl_cnt;
8245                                         /* recalc a clean slate and setup */
8246                                         switch (net->ro._l_addr.sa.sa_family) {
8247 #ifdef INET
8248                                         case AF_INET:
8249                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8250                                                 break;
8251 #endif
8252 #ifdef INET6
8253                                         case AF_INET6:
8254                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8255                                                 break;
8256 #endif
8257                                         default:
8258                                                 /* TSNH */
8259                                                 mtu = net->mtu;
8260                                                 break;
8261                                         }
8262                                         to_out = 0;
8263                                         no_fragmentflg = 1;
8264                                 }
8265                         }
8266                 }
8267                 if (error != 0) {
8268                         /* try next net */
8269                         continue;
8270                 }
8271                 /************************/
8272                 /* Control transmission */
8273                 /************************/
8274                 /* Now first lets go through the control queue */
8275                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8276                         if ((sack_goes_to) &&
8277                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8278                             (chk->whoTo != sack_goes_to)) {
8279                                 /*
8280                                  * if we have a sack in queue, and we are
8281                                  * looking at an ecn echo that is NOT queued
8282                                  * to where the sack is going..
8283                                  */
8284                                 if (chk->whoTo == net) {
8285                                         /*
8286                                          * Don't transmit it to where its
8287                                          * going (current net)
8288                                          */
8289                                         continue;
8290                                 } else if (sack_goes_to == net) {
8291                                         /*
8292                                          * But do transmit it to this
8293                                          * address
8294                                          */
8295                                         goto skip_net_check;
8296                                 }
8297                         }
8298                         if (chk->whoTo == NULL) {
8299                                 if (asoc->alternate == NULL) {
8300                                         if (asoc->primary_destination != net) {
8301                                                 continue;
8302                                         }
8303                                 } else {
8304                                         if (asoc->alternate != net) {
8305                                                 continue;
8306                                         }
8307                                 }
8308                         } else {
8309                                 if (chk->whoTo != net) {
8310                                         continue;
8311                                 }
8312                         }
8313         skip_net_check:
8314                         if (chk->data == NULL) {
8315                                 continue;
8316                         }
8317                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8318                                 /*
8319                                  * It must be unsent. Cookies and ASCONF's
8320                                  * hang around but there timers will force
8321                                  * when marked for resend.
8322                                  */
8323                                 continue;
8324                         }
8325                         /*
8326                          * if no AUTH is yet included and this chunk
8327                          * requires it, make sure to account for it.  We
8328                          * don't apply the size until the AUTH chunk is
8329                          * actually added below in case there is no room for
8330                          * this chunk. NOTE: we overload the use of "omtu"
8331                          * here
8332                          */
8333                         if ((auth == NULL) &&
8334                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8335                             stcb->asoc.peer_auth_chunks)) {
8336                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8337                         } else
8338                                 omtu = 0;
8339                         /* Here we do NOT factor the r_mtu */
8340                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8341                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8342                                 /*
8343                                  * We probably should glom the mbuf chain
8344                                  * from the chk->data for control but the
8345                                  * problem is it becomes yet one more level
8346                                  * of tracking to do if for some reason
8347                                  * output fails. Then I have got to
8348                                  * reconstruct the merged control chain.. el
8349                                  * yucko.. for now we take the easy way and
8350                                  * do the copy
8351                                  */
8352                                 /*
8353                                  * Add an AUTH chunk, if chunk requires it
8354                                  * save the offset into the chain for AUTH
8355                                  */
8356                                 if ((auth == NULL) &&
8357                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8358                                     stcb->asoc.peer_auth_chunks))) {
8359                                         outchain = sctp_add_auth_chunk(outchain,
8360                                             &endoutchain,
8361                                             &auth,
8362                                             &auth_offset,
8363                                             stcb,
8364                                             chk->rec.chunk_id.id);
8365                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8366                                 }
8367                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8368                                     (int)chk->rec.chunk_id.can_take_data,
8369                                     chk->send_size, chk->copy_by_ref);
8370                                 if (outchain == NULL) {
8371                                         *reason_code = 8;
8372                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8373                                         return (ENOMEM);
8374                                 }
8375                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8376                                 /* update our MTU size */
8377                                 if (mtu > (chk->send_size + omtu))
8378                                         mtu -= (chk->send_size + omtu);
8379                                 else
8380                                         mtu = 0;
8381                                 to_out += (chk->send_size + omtu);
8382                                 /* Do clear IP_DF ? */
8383                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8384                                         no_fragmentflg = 0;
8385                                 }
8386                                 if (chk->rec.chunk_id.can_take_data)
8387                                         chk->data = NULL;
8388                                 /* Mark things to be removed, if needed */
8389                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8390                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8391                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8392                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8393                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8394                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8395                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8396                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8397                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8398                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8399                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8400                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8401                                                 hbflag = 1;
8402                                         }
8403                                         /* remove these chunks at the end */
8404                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8405                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8406                                                 /* turn off the timer */
8407                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8408                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8409                                                             inp, stcb, net,
8410                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8411                                                 }
8412                                         }
8413                                         ctl_cnt++;
8414                                 } else {
8415                                         /*
8416                                          * Other chunks, since they have
8417                                          * timers running (i.e. COOKIE) we
8418                                          * just "trust" that it gets sent or
8419                                          * retransmitted.
8420                                          */
8421                                         ctl_cnt++;
8422                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8423                                                 cookie = 1;
8424                                                 no_out_cnt = 1;
8425                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8426                                                 /*
8427                                                  * Increment ecne send count
8428                                                  * here this means we may be
8429                                                  * over-zealous in our
8430                                                  * counting if the send
8431                                                  * fails, but its the best
8432                                                  * place to do it (we used
8433                                                  * to do it in the queue of
8434                                                  * the chunk, but that did
8435                                                  * not tell how many times
8436                                                  * it was sent.
8437                                                  */
8438                                                 SCTP_STAT_INCR(sctps_sendecne);
8439                                         }
8440                                         chk->sent = SCTP_DATAGRAM_SENT;
8441                                         if (chk->whoTo == NULL) {
8442                                                 chk->whoTo = net;
8443                                                 atomic_add_int(&net->ref_count, 1);
8444                                         }
8445                                         chk->snd_count++;
8446                                 }
8447                                 if (mtu == 0) {
8448                                         /*
8449                                          * Ok we are out of room but we can
8450                                          * output without effecting the
8451                                          * flight size since this little guy
8452                                          * is a control only packet.
8453                                          */
8454                                         if (asconf) {
8455                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8456                                                 /*
8457                                                  * do NOT clear the asconf
8458                                                  * flag as it is used to do
8459                                                  * appropriate source
8460                                                  * address selection.
8461                                                  */
8462                                         }
8463                                         if (cookie) {
8464                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8465                                                 cookie = 0;
8466                                         }
8467                                         /* Only HB or ASCONF advances time */
8468                                         if (hbflag) {
8469                                                 if (*now_filled == 0) {
8470                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8471                                                         *now_filled = 1;
8472                                                 }
8473                                                 net->last_sent_time = *now;
8474                                                 hbflag = 0;
8475                                         }
8476                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8477                                             (struct sockaddr *)&net->ro._l_addr,
8478                                             outchain,
8479                                             auth_offset, auth,
8480                                             stcb->asoc.authinfo.active_keyid,
8481                                             no_fragmentflg, 0, asconf,
8482                                             inp->sctp_lport, stcb->rport,
8483                                             htonl(stcb->asoc.peer_vtag),
8484                                             net->port, NULL,
8485                                             0, 0,
8486                                             so_locked))) {
8487                                                 /*
8488                                                  * error, we could not
8489                                                  * output
8490                                                  */
8491                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8492                                                 if (from_where == 0) {
8493                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8494                                                 }
8495                                                 if (error == ENOBUFS) {
8496                                                         asoc->ifp_had_enobuf = 1;
8497                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8498                                                 }
8499                                                 if (error == EHOSTUNREACH) {
8500                                                         /*
8501                                                          * Destination went
8502                                                          * unreachable
8503                                                          * during this send
8504                                                          */
8505                                                         sctp_move_chunks_from_net(stcb, net);
8506                                                 }
8507                                                 *reason_code = 7;
8508                                                 break;
8509                                         } else {
8510                                                 asoc->ifp_had_enobuf = 0;
8511                                         }
8512                                         /*
8513                                          * increase the number we sent, if a
8514                                          * cookie is sent we don't tell them
8515                                          * any was sent out.
8516                                          */
8517                                         outchain = endoutchain = NULL;
8518                                         auth = NULL;
8519                                         auth_offset = 0;
8520                                         if (!no_out_cnt)
8521                                                 *num_out += ctl_cnt;
8522                                         /* recalc a clean slate and setup */
8523                                         switch (net->ro._l_addr.sa.sa_family) {
8524 #ifdef INET
8525                                         case AF_INET:
8526                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8527                                                 break;
8528 #endif
8529 #ifdef INET6
8530                                         case AF_INET6:
8531                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8532                                                 break;
8533 #endif
8534                                         default:
8535                                                 /* TSNH */
8536                                                 mtu = net->mtu;
8537                                                 break;
8538                                         }
8539                                         to_out = 0;
8540                                         no_fragmentflg = 1;
8541                                 }
8542                         }
8543                 }
8544                 if (error != 0) {
8545                         /* try next net */
8546                         continue;
8547                 }
8548                 /* JRI: if dest is in PF state, do not send data to it */
8549                 if ((asoc->sctp_cmt_on_off > 0) &&
8550                     (net != stcb->asoc.alternate) &&
8551                     (net->dest_state & SCTP_ADDR_PF)) {
8552                         goto no_data_fill;
8553                 }
8554                 if (net->flight_size >= net->cwnd) {
8555                         goto no_data_fill;
8556                 }
8557                 if ((asoc->sctp_cmt_on_off > 0) &&
8558                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8559                     (net->flight_size > max_rwnd_per_dest)) {
8560                         goto no_data_fill;
8561                 }
8562                 /*
8563                  * We need a specific accounting for the usage of the send
8564                  * buffer. We also need to check the number of messages per
8565                  * net. For now, this is better than nothing and it disabled
8566                  * by default...
8567                  */
8568                 if ((asoc->sctp_cmt_on_off > 0) &&
8569                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8570                     (max_send_per_dest > 0) &&
8571                     (net->flight_size > max_send_per_dest)) {
8572                         goto no_data_fill;
8573                 }
8574                 /*********************/
8575                 /* Data transmission */
8576                 /*********************/
8577                 /*
8578                  * if AUTH for DATA is required and no AUTH has been added
8579                  * yet, account for this in the mtu now... if no data can be
8580                  * bundled, this adjustment won't matter anyways since the
8581                  * packet will be going out...
8582                  */
8583                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8584                     stcb->asoc.peer_auth_chunks);
8585                 if (data_auth_reqd && (auth == NULL)) {
8586                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8587                 }
8588                 /* now lets add any data within the MTU constraints */
8589                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8590 #ifdef INET
8591                 case AF_INET:
8592                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8593                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8594                         else
8595                                 omtu = 0;
8596                         break;
8597 #endif
8598 #ifdef INET6
8599                 case AF_INET6:
8600                         if (net->mtu > SCTP_MIN_OVERHEAD)
8601                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8602                         else
8603                                 omtu = 0;
8604                         break;
8605 #endif
8606                 default:
8607                         /* TSNH */
8608                         omtu = 0;
8609                         break;
8610                 }
8611                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8612                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8613                     (skip_data_for_this_net == 0)) ||
8614                     (cookie)) {
8615                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8616                                 if (no_data_chunks) {
8617                                         /* let only control go out */
8618                                         *reason_code = 1;
8619                                         break;
8620                                 }
8621                                 if (net->flight_size >= net->cwnd) {
8622                                         /* skip this net, no room for data */
8623                                         *reason_code = 2;
8624                                         break;
8625                                 }
8626                                 if ((chk->whoTo != NULL) &&
8627                                     (chk->whoTo != net)) {
8628                                         /* Don't send the chunk on this net */
8629                                         continue;
8630                                 }
8631
8632                                 if (asoc->sctp_cmt_on_off == 0) {
8633                                         if ((asoc->alternate) &&
8634                                             (asoc->alternate != net) &&
8635                                             (chk->whoTo == NULL)) {
8636                                                 continue;
8637                                         } else if ((net != asoc->primary_destination) &&
8638                                                     (asoc->alternate == NULL) &&
8639                                             (chk->whoTo == NULL)) {
8640                                                 continue;
8641                                         }
8642                                 }
8643                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8644                                         /*-
8645                                          * strange, we have a chunk that is
8646                                          * to big for its destination and
8647                                          * yet no fragment ok flag.
8648                                          * Something went wrong when the
8649                                          * PMTU changed...we did not mark
8650                                          * this chunk for some reason?? I
8651                                          * will fix it here by letting IP
8652                                          * fragment it for now and printing
8653                                          * a warning. This really should not
8654                                          * happen ...
8655                                          */
8656                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8657                                             chk->send_size, mtu);
8658                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8659                                 }
8660                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8661                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8662                                         struct sctp_data_chunk *dchkh;
8663
8664                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8665                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8666                                 }
8667                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8668                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8669                                         /* ok we will add this one */
8670
8671                                         /*
8672                                          * Add an AUTH chunk, if chunk
8673                                          * requires it, save the offset into
8674                                          * the chain for AUTH
8675                                          */
8676                                         if (data_auth_reqd) {
8677                                                 if (auth == NULL) {
8678                                                         outchain = sctp_add_auth_chunk(outchain,
8679                                                             &endoutchain,
8680                                                             &auth,
8681                                                             &auth_offset,
8682                                                             stcb,
8683                                                             SCTP_DATA);
8684                                                         auth_keyid = chk->auth_keyid;
8685                                                         override_ok = 0;
8686                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8687                                                 } else if (override_ok) {
8688                                                         /*
8689                                                          * use this data's
8690                                                          * keyid
8691                                                          */
8692                                                         auth_keyid = chk->auth_keyid;
8693                                                         override_ok = 0;
8694                                                 } else if (auth_keyid != chk->auth_keyid) {
8695                                                         /*
8696                                                          * different keyid,
8697                                                          * so done bundling
8698                                                          */
8699                                                         break;
8700                                                 }
8701                                         }
8702                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8703                                             chk->send_size, chk->copy_by_ref);
8704                                         if (outchain == NULL) {
8705                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8706                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8707                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8708                                                 }
8709                                                 *reason_code = 3;
8710                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8711                                                 return (ENOMEM);
8712                                         }
8713                                         /* upate our MTU size */
8714                                         /* Do clear IP_DF ? */
8715                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8716                                                 no_fragmentflg = 0;
8717                                         }
8718                                         /* unsigned subtraction of mtu */
8719                                         if (mtu > chk->send_size)
8720                                                 mtu -= chk->send_size;
8721                                         else
8722                                                 mtu = 0;
8723                                         /* unsigned subtraction of r_mtu */
8724                                         if (r_mtu > chk->send_size)
8725                                                 r_mtu -= chk->send_size;
8726                                         else
8727                                                 r_mtu = 0;
8728
8729                                         to_out += chk->send_size;
8730                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8731 #ifdef INVARIANTS
8732                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8733 #else
8734                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8735                                                     mx_mtu, to_out);
8736 #endif
8737                                         }
8738                                         chk->window_probe = 0;
8739                                         data_list[bundle_at++] = chk;
8740                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8741                                                 break;
8742                                         }
8743                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8744                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8745                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8746                                                 } else {
8747                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8748                                                 }
8749                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8750                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8751                                                         /*
8752                                                          * Count number of
8753                                                          * user msg's that
8754                                                          * were fragmented
8755                                                          * we do this by
8756                                                          * counting when we
8757                                                          * see a LAST
8758                                                          * fragment only.
8759                                                          */
8760                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8761                                         }
8762                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8763                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8764                                                         data_list[0]->window_probe = 1;
8765                                                         net->window_probe = 1;
8766                                                 }
8767                                                 break;
8768                                         }
8769                                 } else {
8770                                         /*
8771                                          * Must be sent in order of the
8772                                          * TSN's (on a network)
8773                                          */
8774                                         break;
8775                                 }
8776                         }       /* for (chunk gather loop for this net) */
8777                 }               /* if asoc.state OPEN */
8778 no_data_fill:
8779                 /* Is there something to send for this destination? */
8780                 if (outchain) {
8781                         /* We may need to start a control timer or two */
8782                         if (asconf) {
8783                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8784                                     stcb, net);
8785                                 /*
8786                                  * do NOT clear the asconf flag as it is
8787                                  * used to do appropriate source address
8788                                  * selection.
8789                                  */
8790                         }
8791                         if (cookie) {
8792                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8793                                 cookie = 0;
8794                         }
8795                         /* must start a send timer if data is being sent */
8796                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8797                                 /*
8798                                  * no timer running on this destination
8799                                  * restart it.
8800                                  */
8801                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8802                         }
8803                         if (bundle_at || hbflag) {
8804                                 /* For data/asconf and hb set time */
8805                                 if (*now_filled == 0) {
8806                                         (void)SCTP_GETTIME_TIMEVAL(now);
8807                                         *now_filled = 1;
8808                                 }
8809                                 net->last_sent_time = *now;
8810                         }
8811                         /* Now send it, if there is anything to send :> */
8812                         if ((error = sctp_lowlevel_chunk_output(inp,
8813                             stcb,
8814                             net,
8815                             (struct sockaddr *)&net->ro._l_addr,
8816                             outchain,
8817                             auth_offset,
8818                             auth,
8819                             auth_keyid,
8820                             no_fragmentflg,
8821                             bundle_at,
8822                             asconf,
8823                             inp->sctp_lport, stcb->rport,
8824                             htonl(stcb->asoc.peer_vtag),
8825                             net->port, NULL,
8826                             0, 0,
8827                             so_locked))) {
8828                                 /* error, we could not output */
8829                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8830                                 if (from_where == 0) {
8831                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8832                                 }
8833                                 if (error == ENOBUFS) {
8834                                         asoc->ifp_had_enobuf = 1;
8835                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8836                                 }
8837                                 if (error == EHOSTUNREACH) {
8838                                         /*
8839                                          * Destination went unreachable
8840                                          * during this send
8841                                          */
8842                                         sctp_move_chunks_from_net(stcb, net);
8843                                 }
8844                                 *reason_code = 6;
8845                                 /*-
8846                                  * I add this line to be paranoid. As far as
8847                                  * I can tell the continue, takes us back to
8848                                  * the top of the for, but just to make sure
8849                                  * I will reset these again here.
8850                                  */
8851                                 ctl_cnt = bundle_at = 0;
8852                                 continue;       /* This takes us back to the
8853                                                  * for() for the nets. */
8854                         } else {
8855                                 asoc->ifp_had_enobuf = 0;
8856                         }
8857                         endoutchain = NULL;
8858                         auth = NULL;
8859                         auth_offset = 0;
8860                         if (!no_out_cnt) {
8861                                 *num_out += (ctl_cnt + bundle_at);
8862                         }
8863                         if (bundle_at) {
8864                                 /* setup for a RTO measurement */
8865                                 tsns_sent = data_list[0]->rec.data.tsn;
8866                                 /* fill time if not already filled */
8867                                 if (*now_filled == 0) {
8868                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8869                                         *now_filled = 1;
8870                                         *now = asoc->time_last_sent;
8871                                 } else {
8872                                         asoc->time_last_sent = *now;
8873                                 }
8874                                 if (net->rto_needed) {
8875                                         data_list[0]->do_rtt = 1;
8876                                         net->rto_needed = 0;
8877                                 }
8878                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8879                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8880                         }
8881                         if (one_chunk) {
8882                                 break;
8883                         }
8884                 }
8885                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8886                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8887                 }
8888         }
8889         if (old_start_at == NULL) {
8890                 old_start_at = start_at;
8891                 start_at = TAILQ_FIRST(&asoc->nets);
8892                 if (old_start_at)
8893                         goto again_one_more_time;
8894         }
8895
8896         /*
8897          * At the end there should be no NON timed chunks hanging on this
8898          * queue.
8899          */
8900         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8901                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8902         }
8903         if ((*num_out == 0) && (*reason_code == 0)) {
8904                 *reason_code = 4;
8905         } else {
8906                 *reason_code = 5;
8907         }
8908         sctp_clean_up_ctl(stcb, asoc, so_locked);
8909         return (0);
8910 }
8911
8912 void
8913 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8914 {
8915         /*-
8916          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8917          * the control chunk queue.
8918          */
8919         struct sctp_chunkhdr *hdr;
8920         struct sctp_tmit_chunk *chk;
8921         struct mbuf *mat, *last_mbuf;
8922         uint32_t chunk_length;
8923         uint16_t padding_length;
8924
8925         SCTP_TCB_LOCK_ASSERT(stcb);
8926         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8927         if (op_err == NULL) {
8928                 return;
8929         }
8930         last_mbuf = NULL;
8931         chunk_length = 0;
8932         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8933                 chunk_length += SCTP_BUF_LEN(mat);
8934                 if (SCTP_BUF_NEXT(mat) == NULL) {
8935                         last_mbuf = mat;
8936                 }
8937         }
8938         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8939                 sctp_m_freem(op_err);
8940                 return;
8941         }
8942         padding_length = chunk_length % 4;
8943         if (padding_length != 0) {
8944                 padding_length = 4 - padding_length;
8945         }
8946         if (padding_length != 0) {
8947                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8948                         sctp_m_freem(op_err);
8949                         return;
8950                 }
8951         }
8952         sctp_alloc_a_chunk(stcb, chk);
8953         if (chk == NULL) {
8954                 /* no memory */
8955                 sctp_m_freem(op_err);
8956                 return;
8957         }
8958         chk->copy_by_ref = 0;
8959         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8960         chk->rec.chunk_id.can_take_data = 0;
8961         chk->flags = 0;
8962         chk->send_size = (uint16_t)chunk_length;
8963         chk->sent = SCTP_DATAGRAM_UNSENT;
8964         chk->snd_count = 0;
8965         chk->asoc = &stcb->asoc;
8966         chk->data = op_err;
8967         chk->whoTo = NULL;
8968         hdr = mtod(op_err, struct sctp_chunkhdr *);
8969         hdr->chunk_type = SCTP_OPERATION_ERROR;
8970         hdr->chunk_flags = 0;
8971         hdr->chunk_length = htons(chk->send_size);
8972         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8973         chk->asoc->ctrl_queue_cnt++;
8974 }
8975
8976 int
8977 sctp_send_cookie_echo(struct mbuf *m,
8978     int offset,
8979     struct sctp_tcb *stcb,
8980     struct sctp_nets *net)
8981 {
8982         /*-
8983          * pull out the cookie and put it at the front of the control chunk
8984          * queue.
8985          */
8986         int at;
8987         struct mbuf *cookie;
8988         struct sctp_paramhdr param, *phdr;
8989         struct sctp_chunkhdr *hdr;
8990         struct sctp_tmit_chunk *chk;
8991         uint16_t ptype, plen;
8992
8993         SCTP_TCB_LOCK_ASSERT(stcb);
8994         /* First find the cookie in the param area */
8995         cookie = NULL;
8996         at = offset + sizeof(struct sctp_init_chunk);
8997         for (;;) {
8998                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8999                 if (phdr == NULL) {
9000                         return (-3);
9001                 }
9002                 ptype = ntohs(phdr->param_type);
9003                 plen = ntohs(phdr->param_length);
9004                 if (ptype == SCTP_STATE_COOKIE) {
9005                         int pad;
9006
9007                         /* found the cookie */
9008                         if ((pad = (plen % 4))) {
9009                                 plen += 4 - pad;
9010                         }
9011                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9012                         if (cookie == NULL) {
9013                                 /* No memory */
9014                                 return (-2);
9015                         }
9016 #ifdef SCTP_MBUF_LOGGING
9017                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9018                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9019                         }
9020 #endif
9021                         break;
9022                 }
9023                 at += SCTP_SIZE32(plen);
9024         }
9025         /* ok, we got the cookie lets change it into a cookie echo chunk */
9026         /* first the change from param to cookie */
9027         hdr = mtod(cookie, struct sctp_chunkhdr *);
9028         hdr->chunk_type = SCTP_COOKIE_ECHO;
9029         hdr->chunk_flags = 0;
9030         /* get the chunk stuff now and place it in the FRONT of the queue */
9031         sctp_alloc_a_chunk(stcb, chk);
9032         if (chk == NULL) {
9033                 /* no memory */
9034                 sctp_m_freem(cookie);
9035                 return (-5);
9036         }
9037         chk->copy_by_ref = 0;
9038         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9039         chk->rec.chunk_id.can_take_data = 0;
9040         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9041         chk->send_size = plen;
9042         chk->sent = SCTP_DATAGRAM_UNSENT;
9043         chk->snd_count = 0;
9044         chk->asoc = &stcb->asoc;
9045         chk->data = cookie;
9046         chk->whoTo = net;
9047         atomic_add_int(&chk->whoTo->ref_count, 1);
9048         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9049         chk->asoc->ctrl_queue_cnt++;
9050         return (0);
9051 }
9052
9053 void
9054 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9055     struct mbuf *m,
9056     int offset,
9057     int chk_length,
9058     struct sctp_nets *net)
9059 {
9060         /*
9061          * take a HB request and make it into a HB ack and send it.
9062          */
9063         struct mbuf *outchain;
9064         struct sctp_chunkhdr *chdr;
9065         struct sctp_tmit_chunk *chk;
9066
9067
9068         if (net == NULL)
9069                 /* must have a net pointer */
9070                 return;
9071
9072         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9073         if (outchain == NULL) {
9074                 /* gak out of memory */
9075                 return;
9076         }
9077 #ifdef SCTP_MBUF_LOGGING
9078         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9079                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9080         }
9081 #endif
9082         chdr = mtod(outchain, struct sctp_chunkhdr *);
9083         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9084         chdr->chunk_flags = 0;
9085         if (chk_length % 4) {
9086                 /* need pad */
9087                 uint32_t cpthis = 0;
9088                 int padlen;
9089
9090                 padlen = 4 - (chk_length % 4);
9091                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9092         }
9093         sctp_alloc_a_chunk(stcb, chk);
9094         if (chk == NULL) {
9095                 /* no memory */
9096                 sctp_m_freem(outchain);
9097                 return;
9098         }
9099         chk->copy_by_ref = 0;
9100         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9101         chk->rec.chunk_id.can_take_data = 1;
9102         chk->flags = 0;
9103         chk->send_size = chk_length;
9104         chk->sent = SCTP_DATAGRAM_UNSENT;
9105         chk->snd_count = 0;
9106         chk->asoc = &stcb->asoc;
9107         chk->data = outchain;
9108         chk->whoTo = net;
9109         atomic_add_int(&chk->whoTo->ref_count, 1);
9110         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9111         chk->asoc->ctrl_queue_cnt++;
9112 }
9113
9114 void
9115 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9116 {
9117         /* formulate and queue a cookie-ack back to sender */
9118         struct mbuf *cookie_ack;
9119         struct sctp_chunkhdr *hdr;
9120         struct sctp_tmit_chunk *chk;
9121
9122         SCTP_TCB_LOCK_ASSERT(stcb);
9123
9124         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9125         if (cookie_ack == NULL) {
9126                 /* no mbuf's */
9127                 return;
9128         }
9129         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9130         sctp_alloc_a_chunk(stcb, chk);
9131         if (chk == NULL) {
9132                 /* no memory */
9133                 sctp_m_freem(cookie_ack);
9134                 return;
9135         }
9136         chk->copy_by_ref = 0;
9137         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9138         chk->rec.chunk_id.can_take_data = 1;
9139         chk->flags = 0;
9140         chk->send_size = sizeof(struct sctp_chunkhdr);
9141         chk->sent = SCTP_DATAGRAM_UNSENT;
9142         chk->snd_count = 0;
9143         chk->asoc = &stcb->asoc;
9144         chk->data = cookie_ack;
9145         if (chk->asoc->last_control_chunk_from != NULL) {
9146                 chk->whoTo = chk->asoc->last_control_chunk_from;
9147                 atomic_add_int(&chk->whoTo->ref_count, 1);
9148         } else {
9149                 chk->whoTo = NULL;
9150         }
9151         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9152         hdr->chunk_type = SCTP_COOKIE_ACK;
9153         hdr->chunk_flags = 0;
9154         hdr->chunk_length = htons(chk->send_size);
9155         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9156         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9157         chk->asoc->ctrl_queue_cnt++;
9158         return;
9159 }
9160
9161
9162 void
9163 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9164 {
9165         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9166         struct mbuf *m_shutdown_ack;
9167         struct sctp_shutdown_ack_chunk *ack_cp;
9168         struct sctp_tmit_chunk *chk;
9169
9170         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9171         if (m_shutdown_ack == NULL) {
9172                 /* no mbuf's */
9173                 return;
9174         }
9175         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9176         sctp_alloc_a_chunk(stcb, chk);
9177         if (chk == NULL) {
9178                 /* no memory */
9179                 sctp_m_freem(m_shutdown_ack);
9180                 return;
9181         }
9182         chk->copy_by_ref = 0;
9183         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9184         chk->rec.chunk_id.can_take_data = 1;
9185         chk->flags = 0;
9186         chk->send_size = sizeof(struct sctp_chunkhdr);
9187         chk->sent = SCTP_DATAGRAM_UNSENT;
9188         chk->snd_count = 0;
9189         chk->asoc = &stcb->asoc;
9190         chk->data = m_shutdown_ack;
9191         chk->whoTo = net;
9192         if (chk->whoTo) {
9193                 atomic_add_int(&chk->whoTo->ref_count, 1);
9194         }
9195         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9196         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9197         ack_cp->ch.chunk_flags = 0;
9198         ack_cp->ch.chunk_length = htons(chk->send_size);
9199         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9200         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9201         chk->asoc->ctrl_queue_cnt++;
9202         return;
9203 }
9204
9205 void
9206 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9207 {
9208         /* formulate and queue a SHUTDOWN to the sender */
9209         struct mbuf *m_shutdown;
9210         struct sctp_shutdown_chunk *shutdown_cp;
9211         struct sctp_tmit_chunk *chk;
9212
9213         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9214                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9215                         /* We already have a SHUTDOWN queued. Reuse it. */
9216                         if (chk->whoTo) {
9217                                 sctp_free_remote_addr(chk->whoTo);
9218                                 chk->whoTo = NULL;
9219                         }
9220                         break;
9221                 }
9222         }
9223         if (chk == NULL) {
9224                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9225                 if (m_shutdown == NULL) {
9226                         /* no mbuf's */
9227                         return;
9228                 }
9229                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9230                 sctp_alloc_a_chunk(stcb, chk);
9231                 if (chk == NULL) {
9232                         /* no memory */
9233                         sctp_m_freem(m_shutdown);
9234                         return;
9235                 }
9236                 chk->copy_by_ref = 0;
9237                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9238                 chk->rec.chunk_id.can_take_data = 1;
9239                 chk->flags = 0;
9240                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9241                 chk->sent = SCTP_DATAGRAM_UNSENT;
9242                 chk->snd_count = 0;
9243                 chk->asoc = &stcb->asoc;
9244                 chk->data = m_shutdown;
9245                 chk->whoTo = net;
9246                 if (chk->whoTo) {
9247                         atomic_add_int(&chk->whoTo->ref_count, 1);
9248                 }
9249                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9250                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9251                 shutdown_cp->ch.chunk_flags = 0;
9252                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9253                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9254                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9255                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9256                 chk->asoc->ctrl_queue_cnt++;
9257         } else {
9258                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9259                 chk->whoTo = net;
9260                 if (chk->whoTo) {
9261                         atomic_add_int(&chk->whoTo->ref_count, 1);
9262                 }
9263                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9264                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9265                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9266         }
9267         return;
9268 }
9269
9270 void
9271 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9272 {
9273         /*
9274          * formulate and queue an ASCONF to the peer. ASCONF parameters
9275          * should be queued on the assoc queue.
9276          */
9277         struct sctp_tmit_chunk *chk;
9278         struct mbuf *m_asconf;
9279         int len;
9280
9281         SCTP_TCB_LOCK_ASSERT(stcb);
9282
9283         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9284             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9285                 /* can't send a new one if there is one in flight already */
9286                 return;
9287         }
9288
9289         /* compose an ASCONF chunk, maximum length is PMTU */
9290         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9291         if (m_asconf == NULL) {
9292                 return;
9293         }
9294
9295         sctp_alloc_a_chunk(stcb, chk);
9296         if (chk == NULL) {
9297                 /* no memory */
9298                 sctp_m_freem(m_asconf);
9299                 return;
9300         }
9301
9302         chk->copy_by_ref = 0;
9303         chk->rec.chunk_id.id = SCTP_ASCONF;
9304         chk->rec.chunk_id.can_take_data = 0;
9305         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9306         chk->data = m_asconf;
9307         chk->send_size = len;
9308         chk->sent = SCTP_DATAGRAM_UNSENT;
9309         chk->snd_count = 0;
9310         chk->asoc = &stcb->asoc;
9311         chk->whoTo = net;
9312         if (chk->whoTo) {
9313                 atomic_add_int(&chk->whoTo->ref_count, 1);
9314         }
9315         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9316         chk->asoc->ctrl_queue_cnt++;
9317         return;
9318 }
9319
9320 void
9321 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9322 {
9323         /*
9324          * formulate and queue a asconf-ack back to sender. the asconf-ack
9325          * must be stored in the tcb.
9326          */
9327         struct sctp_tmit_chunk *chk;
9328         struct sctp_asconf_ack *ack, *latest_ack;
9329         struct mbuf *m_ack;
9330         struct sctp_nets *net = NULL;
9331
9332         SCTP_TCB_LOCK_ASSERT(stcb);
9333         /* Get the latest ASCONF-ACK */
9334         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9335         if (latest_ack == NULL) {
9336                 return;
9337         }
9338         if (latest_ack->last_sent_to != NULL &&
9339             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9340                 /* we're doing a retransmission */
9341                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9342                 if (net == NULL) {
9343                         /* no alternate */
9344                         if (stcb->asoc.last_control_chunk_from == NULL) {
9345                                 if (stcb->asoc.alternate) {
9346                                         net = stcb->asoc.alternate;
9347                                 } else {
9348                                         net = stcb->asoc.primary_destination;
9349                                 }
9350                         } else {
9351                                 net = stcb->asoc.last_control_chunk_from;
9352                         }
9353                 }
9354         } else {
9355                 /* normal case */
9356                 if (stcb->asoc.last_control_chunk_from == NULL) {
9357                         if (stcb->asoc.alternate) {
9358                                 net = stcb->asoc.alternate;
9359                         } else {
9360                                 net = stcb->asoc.primary_destination;
9361                         }
9362                 } else {
9363                         net = stcb->asoc.last_control_chunk_from;
9364                 }
9365         }
9366         latest_ack->last_sent_to = net;
9367
9368         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9369                 if (ack->data == NULL) {
9370                         continue;
9371                 }
9372
9373                 /* copy the asconf_ack */
9374                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9375                 if (m_ack == NULL) {
9376                         /* couldn't copy it */
9377                         return;
9378                 }
9379 #ifdef SCTP_MBUF_LOGGING
9380                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9381                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9382                 }
9383 #endif
9384
9385                 sctp_alloc_a_chunk(stcb, chk);
9386                 if (chk == NULL) {
9387                         /* no memory */
9388                         if (m_ack)
9389                                 sctp_m_freem(m_ack);
9390                         return;
9391                 }
9392                 chk->copy_by_ref = 0;
9393                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9394                 chk->rec.chunk_id.can_take_data = 1;
9395                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9396                 chk->whoTo = net;
9397                 if (chk->whoTo) {
9398                         atomic_add_int(&chk->whoTo->ref_count, 1);
9399                 }
9400                 chk->data = m_ack;
9401                 chk->send_size = ack->len;
9402                 chk->sent = SCTP_DATAGRAM_UNSENT;
9403                 chk->snd_count = 0;
9404                 chk->asoc = &stcb->asoc;
9405
9406                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9407                 chk->asoc->ctrl_queue_cnt++;
9408         }
9409         return;
9410 }
9411
9412
9413 static int
9414 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9415     struct sctp_tcb *stcb,
9416     struct sctp_association *asoc,
9417     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9418 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9419     SCTP_UNUSED
9420 #endif
9421 )
9422 {
9423         /*-
9424          * send out one MTU of retransmission. If fast_retransmit is
9425          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9426          * rwnd. For a Cookie or Asconf in the control chunk queue we
9427          * retransmit them by themselves.
9428          *
9429          * For data chunks we will pick out the lowest TSN's in the sent_queue
9430          * marked for resend and bundle them all together (up to a MTU of
9431          * destination). The address to send to should have been
9432          * selected/changed where the retransmission was marked (i.e. in FR
9433          * or t3-timeout routines).
9434          */
9435         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9436         struct sctp_tmit_chunk *chk, *fwd;
9437         struct mbuf *m, *endofchain;
9438         struct sctp_nets *net = NULL;
9439         uint32_t tsns_sent = 0;
9440         int no_fragmentflg, bundle_at, cnt_thru;
9441         unsigned int mtu;
9442         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9443         struct sctp_auth_chunk *auth = NULL;
9444         uint32_t auth_offset = 0;
9445         uint16_t auth_keyid;
9446         int override_ok = 1;
9447         int data_auth_reqd = 0;
9448         uint32_t dmtu = 0;
9449
9450         SCTP_TCB_LOCK_ASSERT(stcb);
9451         tmr_started = ctl_cnt = bundle_at = error = 0;
9452         no_fragmentflg = 1;
9453         fwd_tsn = 0;
9454         *cnt_out = 0;
9455         fwd = NULL;
9456         endofchain = m = NULL;
9457         auth_keyid = stcb->asoc.authinfo.active_keyid;
9458 #ifdef SCTP_AUDITING_ENABLED
9459         sctp_audit_log(0xC3, 1);
9460 #endif
9461         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9462             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9463                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9464                     asoc->sent_queue_retran_cnt);
9465                 asoc->sent_queue_cnt = 0;
9466                 asoc->sent_queue_cnt_removeable = 0;
9467                 /* send back 0/0 so we enter normal transmission */
9468                 *cnt_out = 0;
9469                 return (0);
9470         }
9471         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9472                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9473                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9474                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9475                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9476                                 continue;
9477                         }
9478                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9479                                 if (chk != asoc->str_reset) {
9480                                         /*
9481                                          * not eligible for retran if its
9482                                          * not ours
9483                                          */
9484                                         continue;
9485                                 }
9486                         }
9487                         ctl_cnt++;
9488                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9489                                 fwd_tsn = 1;
9490                         }
9491                         /*
9492                          * Add an AUTH chunk, if chunk requires it save the
9493                          * offset into the chain for AUTH
9494                          */
9495                         if ((auth == NULL) &&
9496                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9497                             stcb->asoc.peer_auth_chunks))) {
9498                                 m = sctp_add_auth_chunk(m, &endofchain,
9499                                     &auth, &auth_offset,
9500                                     stcb,
9501                                     chk->rec.chunk_id.id);
9502                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9503                         }
9504                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9505                         break;
9506                 }
9507         }
9508         one_chunk = 0;
9509         cnt_thru = 0;
9510         /* do we have control chunks to retransmit? */
9511         if (m != NULL) {
9512                 /* Start a timer no matter if we succeed or fail */
9513                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9514                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9515                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9516                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9517                 chk->snd_count++;       /* update our count */
9518                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9519                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9520                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9521                     no_fragmentflg, 0, 0,
9522                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9523                     chk->whoTo->port, NULL,
9524                     0, 0,
9525                     so_locked))) {
9526                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9527                         if (error == ENOBUFS) {
9528                                 asoc->ifp_had_enobuf = 1;
9529                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9530                         }
9531                         return (error);
9532                 } else {
9533                         asoc->ifp_had_enobuf = 0;
9534                 }
9535                 endofchain = NULL;
9536                 auth = NULL;
9537                 auth_offset = 0;
9538                 /*
9539                  * We don't want to mark the net->sent time here since this
9540                  * we use this for HB and retrans cannot measure RTT
9541                  */
9542                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9543                 *cnt_out += 1;
9544                 chk->sent = SCTP_DATAGRAM_SENT;
9545                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9546                 if (fwd_tsn == 0) {
9547                         return (0);
9548                 } else {
9549                         /* Clean up the fwd-tsn list */
9550                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9551                         return (0);
9552                 }
9553         }
9554         /*
9555          * Ok, it is just data retransmission we need to do or that and a
9556          * fwd-tsn with it all.
9557          */
9558         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9559                 return (SCTP_RETRAN_DONE);
9560         }
9561         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9562             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9563                 /* not yet open, resend the cookie and that is it */
9564                 return (1);
9565         }
9566 #ifdef SCTP_AUDITING_ENABLED
9567         sctp_auditing(20, inp, stcb, NULL);
9568 #endif
9569         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9570         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9571                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9572                         /* No, not sent to this net or not ready for rtx */
9573                         continue;
9574                 }
9575                 if (chk->data == NULL) {
9576                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9577                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9578                         continue;
9579                 }
9580                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9581                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9582                         struct mbuf *op_err;
9583                         char msg[SCTP_DIAG_INFO_LEN];
9584
9585                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9586                             chk->rec.data.tsn, chk->snd_count);
9587                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9588                             msg);
9589                         atomic_add_int(&stcb->asoc.refcnt, 1);
9590                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9591                             so_locked);
9592                         SCTP_TCB_LOCK(stcb);
9593                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9594                         return (SCTP_RETRAN_EXIT);
9595                 }
9596                 /* pick up the net */
9597                 net = chk->whoTo;
9598                 switch (net->ro._l_addr.sa.sa_family) {
9599 #ifdef INET
9600                 case AF_INET:
9601                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9602                         break;
9603 #endif
9604 #ifdef INET6
9605                 case AF_INET6:
9606                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9607                         break;
9608 #endif
9609                 default:
9610                         /* TSNH */
9611                         mtu = net->mtu;
9612                         break;
9613                 }
9614
9615                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9616                         /* No room in peers rwnd */
9617                         uint32_t tsn;
9618
9619                         tsn = asoc->last_acked_seq + 1;
9620                         if (tsn == chk->rec.data.tsn) {
9621                                 /*
9622                                  * we make a special exception for this
9623                                  * case. The peer has no rwnd but is missing
9624                                  * the lowest chunk.. which is probably what
9625                                  * is holding up the rwnd.
9626                                  */
9627                                 goto one_chunk_around;
9628                         }
9629                         return (1);
9630                 }
9631 one_chunk_around:
9632                 if (asoc->peers_rwnd < mtu) {
9633                         one_chunk = 1;
9634                         if ((asoc->peers_rwnd == 0) &&
9635                             (asoc->total_flight == 0)) {
9636                                 chk->window_probe = 1;
9637                                 chk->whoTo->window_probe = 1;
9638                         }
9639                 }
9640 #ifdef SCTP_AUDITING_ENABLED
9641                 sctp_audit_log(0xC3, 2);
9642 #endif
9643                 bundle_at = 0;
9644                 m = NULL;
9645                 net->fast_retran_ip = 0;
9646                 if (chk->rec.data.doing_fast_retransmit == 0) {
9647                         /*
9648                          * if no FR in progress skip destination that have
9649                          * flight_size > cwnd.
9650                          */
9651                         if (net->flight_size >= net->cwnd) {
9652                                 continue;
9653                         }
9654                 } else {
9655                         /*
9656                          * Mark the destination net to have FR recovery
9657                          * limits put on it.
9658                          */
9659                         *fr_done = 1;
9660                         net->fast_retran_ip = 1;
9661                 }
9662
9663                 /*
9664                  * if no AUTH is yet included and this chunk requires it,
9665                  * make sure to account for it.  We don't apply the size
9666                  * until the AUTH chunk is actually added below in case
9667                  * there is no room for this chunk.
9668                  */
9669                 if (data_auth_reqd && (auth == NULL)) {
9670                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9671                 } else
9672                         dmtu = 0;
9673
9674                 if ((chk->send_size <= (mtu - dmtu)) ||
9675                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9676                         /* ok we will add this one */
9677                         if (data_auth_reqd) {
9678                                 if (auth == NULL) {
9679                                         m = sctp_add_auth_chunk(m,
9680                                             &endofchain,
9681                                             &auth,
9682                                             &auth_offset,
9683                                             stcb,
9684                                             SCTP_DATA);
9685                                         auth_keyid = chk->auth_keyid;
9686                                         override_ok = 0;
9687                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9688                                 } else if (override_ok) {
9689                                         auth_keyid = chk->auth_keyid;
9690                                         override_ok = 0;
9691                                 } else if (chk->auth_keyid != auth_keyid) {
9692                                         /* different keyid, so done bundling */
9693                                         break;
9694                                 }
9695                         }
9696                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9697                         if (m == NULL) {
9698                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9699                                 return (ENOMEM);
9700                         }
9701                         /* Do clear IP_DF ? */
9702                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9703                                 no_fragmentflg = 0;
9704                         }
9705                         /* upate our MTU size */
9706                         if (mtu > (chk->send_size + dmtu))
9707                                 mtu -= (chk->send_size + dmtu);
9708                         else
9709                                 mtu = 0;
9710                         data_list[bundle_at++] = chk;
9711                         if (one_chunk && (asoc->total_flight <= 0)) {
9712                                 SCTP_STAT_INCR(sctps_windowprobed);
9713                         }
9714                 }
9715                 if (one_chunk == 0) {
9716                         /*
9717                          * now are there anymore forward from chk to pick
9718                          * up?
9719                          */
9720                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9721                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9722                                         /* Nope, not for retran */
9723                                         continue;
9724                                 }
9725                                 if (fwd->whoTo != net) {
9726                                         /* Nope, not the net in question */
9727                                         continue;
9728                                 }
9729                                 if (data_auth_reqd && (auth == NULL)) {
9730                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9731                                 } else
9732                                         dmtu = 0;
9733                                 if (fwd->send_size <= (mtu - dmtu)) {
9734                                         if (data_auth_reqd) {
9735                                                 if (auth == NULL) {
9736                                                         m = sctp_add_auth_chunk(m,
9737                                                             &endofchain,
9738                                                             &auth,
9739                                                             &auth_offset,
9740                                                             stcb,
9741                                                             SCTP_DATA);
9742                                                         auth_keyid = fwd->auth_keyid;
9743                                                         override_ok = 0;
9744                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9745                                                 } else if (override_ok) {
9746                                                         auth_keyid = fwd->auth_keyid;
9747                                                         override_ok = 0;
9748                                                 } else if (fwd->auth_keyid != auth_keyid) {
9749                                                         /*
9750                                                          * different keyid,
9751                                                          * so done bundling
9752                                                          */
9753                                                         break;
9754                                                 }
9755                                         }
9756                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9757                                         if (m == NULL) {
9758                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9759                                                 return (ENOMEM);
9760                                         }
9761                                         /* Do clear IP_DF ? */
9762                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9763                                                 no_fragmentflg = 0;
9764                                         }
9765                                         /* upate our MTU size */
9766                                         if (mtu > (fwd->send_size + dmtu))
9767                                                 mtu -= (fwd->send_size + dmtu);
9768                                         else
9769                                                 mtu = 0;
9770                                         data_list[bundle_at++] = fwd;
9771                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9772                                                 break;
9773                                         }
9774                                 } else {
9775                                         /* can't fit so we are done */
9776                                         break;
9777                                 }
9778                         }
9779                 }
9780                 /* Is there something to send for this destination? */
9781                 if (m) {
9782                         /*
9783                          * No matter if we fail/or succeed we should start a
9784                          * timer. A failure is like a lost IP packet :-)
9785                          */
9786                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9787                                 /*
9788                                  * no timer running on this destination
9789                                  * restart it.
9790                                  */
9791                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9792                                 tmr_started = 1;
9793                         }
9794                         /* Now lets send it, if there is anything to send :> */
9795                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9796                             (struct sockaddr *)&net->ro._l_addr, m,
9797                             auth_offset, auth, auth_keyid,
9798                             no_fragmentflg, 0, 0,
9799                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9800                             net->port, NULL,
9801                             0, 0,
9802                             so_locked))) {
9803                                 /* error, we could not output */
9804                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9805                                 if (error == ENOBUFS) {
9806                                         asoc->ifp_had_enobuf = 1;
9807                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9808                                 }
9809                                 return (error);
9810                         } else {
9811                                 asoc->ifp_had_enobuf = 0;
9812                         }
9813                         endofchain = NULL;
9814                         auth = NULL;
9815                         auth_offset = 0;
9816                         /* For HB's */
9817                         /*
9818                          * We don't want to mark the net->sent time here
9819                          * since this we use this for HB and retrans cannot
9820                          * measure RTT
9821                          */
9822                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9823
9824                         /* For auto-close */
9825                         cnt_thru++;
9826                         if (*now_filled == 0) {
9827                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9828                                 *now = asoc->time_last_sent;
9829                                 *now_filled = 1;
9830                         } else {
9831                                 asoc->time_last_sent = *now;
9832                         }
9833                         *cnt_out += bundle_at;
9834 #ifdef SCTP_AUDITING_ENABLED
9835                         sctp_audit_log(0xC4, bundle_at);
9836 #endif
9837                         if (bundle_at) {
9838                                 tsns_sent = data_list[0]->rec.data.tsn;
9839                         }
9840                         for (i = 0; i < bundle_at; i++) {
9841                                 SCTP_STAT_INCR(sctps_sendretransdata);
9842                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9843                                 /*
9844                                  * When we have a revoked data, and we
9845                                  * retransmit it, then we clear the revoked
9846                                  * flag since this flag dictates if we
9847                                  * subtracted from the fs
9848                                  */
9849                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9850                                         /* Deflate the cwnd */
9851                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9852                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9853                                 }
9854                                 data_list[i]->snd_count++;
9855                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9856                                 /* record the time */
9857                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9858                                 if (data_list[i]->book_size_scale) {
9859                                         /*
9860                                          * need to double the book size on
9861                                          * this one
9862                                          */
9863                                         data_list[i]->book_size_scale = 0;
9864                                         /*
9865                                          * Since we double the booksize, we
9866                                          * must also double the output queue
9867                                          * size, since this get shrunk when
9868                                          * we free by this amount.
9869                                          */
9870                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9871                                         data_list[i]->book_size *= 2;
9872
9873
9874                                 } else {
9875                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9876                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9877                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9878                                         }
9879                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9880                                             (uint32_t)(data_list[i]->send_size +
9881                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9882                                 }
9883                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9884                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9885                                             data_list[i]->whoTo->flight_size,
9886                                             data_list[i]->book_size,
9887                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9888                                             data_list[i]->rec.data.tsn);
9889                                 }
9890                                 sctp_flight_size_increase(data_list[i]);
9891                                 sctp_total_flight_increase(stcb, data_list[i]);
9892                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9893                                         /* SWS sender side engages */
9894                                         asoc->peers_rwnd = 0;
9895                                 }
9896                                 if ((i == 0) &&
9897                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9898                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9899                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9900                                             (tmr_started == 0)) {
9901                                                 /*-
9902                                                  * ok we just fast-retrans'd
9903                                                  * the lowest TSN, i.e the
9904                                                  * first on the list. In
9905                                                  * this case we want to give
9906                                                  * some more time to get a
9907                                                  * SACK back without a
9908                                                  * t3-expiring.
9909                                                  */
9910                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9911                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9912                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9913                                         }
9914                                 }
9915                         }
9916                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9917                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9918                         }
9919 #ifdef SCTP_AUDITING_ENABLED
9920                         sctp_auditing(21, inp, stcb, NULL);
9921 #endif
9922                 } else {
9923                         /* None will fit */
9924                         return (1);
9925                 }
9926                 if (asoc->sent_queue_retran_cnt <= 0) {
9927                         /* all done we have no more to retran */
9928                         asoc->sent_queue_retran_cnt = 0;
9929                         break;
9930                 }
9931                 if (one_chunk) {
9932                         /* No more room in rwnd */
9933                         return (1);
9934                 }
9935                 /* stop the for loop here. we sent out a packet */
9936                 break;
9937         }
9938         return (0);
9939 }
9940
9941 static void
9942 sctp_timer_validation(struct sctp_inpcb *inp,
9943     struct sctp_tcb *stcb,
9944     struct sctp_association *asoc)
9945 {
9946         struct sctp_nets *net;
9947
9948         /* Validate that a timer is running somewhere */
9949         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9950                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9951                         /* Here is a timer */
9952                         return;
9953                 }
9954         }
9955         SCTP_TCB_LOCK_ASSERT(stcb);
9956         /* Gak, we did not have a timer somewhere */
9957         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9958         if (asoc->alternate) {
9959                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9960         } else {
9961                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9962         }
9963         return;
9964 }
9965
9966 void
9967 sctp_chunk_output(struct sctp_inpcb *inp,
9968     struct sctp_tcb *stcb,
9969     int from_where,
9970     int so_locked
9971 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9972     SCTP_UNUSED
9973 #endif
9974 )
9975 {
9976         /*-
9977          * Ok this is the generic chunk service queue. we must do the
9978          * following:
9979          * - See if there are retransmits pending, if so we must
9980          *   do these first.
9981          * - Service the stream queue that is next, moving any
9982          *   message (note I must get a complete message i.e.
9983          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9984          *   TSN's
9985          * - Check to see if the cwnd/rwnd allows any output, if so we
9986          *   go ahead and fomulate and send the low level chunks. Making sure
9987          *   to combine any control in the control chunk queue also.
9988          */
9989         struct sctp_association *asoc;
9990         struct sctp_nets *net;
9991         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9992         unsigned int burst_cnt = 0;
9993         struct timeval now;
9994         int now_filled = 0;
9995         int nagle_on;
9996         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9997         int un_sent = 0;
9998         int fr_done;
9999         unsigned int tot_frs = 0;
10000
10001         asoc = &stcb->asoc;
10002 do_it_again:
10003         /* The Nagle algorithm is only applied when handling a send call. */
10004         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10005                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10006                         nagle_on = 0;
10007                 } else {
10008                         nagle_on = 1;
10009                 }
10010         } else {
10011                 nagle_on = 0;
10012         }
10013         SCTP_TCB_LOCK_ASSERT(stcb);
10014
10015         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10016
10017         if ((un_sent <= 0) &&
10018             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10019             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10020             (asoc->sent_queue_retran_cnt == 0) &&
10021             (asoc->trigger_reset == 0)) {
10022                 /* Nothing to do unless there is something to be sent left */
10023                 return;
10024         }
10025         /*
10026          * Do we have something to send, data or control AND a sack timer
10027          * running, if so piggy-back the sack.
10028          */
10029         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10030                 sctp_send_sack(stcb, so_locked);
10031                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10032         }
10033         while (asoc->sent_queue_retran_cnt) {
10034                 /*-
10035                  * Ok, it is retransmission time only, we send out only ONE
10036                  * packet with a single call off to the retran code.
10037                  */
10038                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10039                         /*-
10040                          * Special hook for handling cookiess discarded
10041                          * by peer that carried data. Send cookie-ack only
10042                          * and then the next call with get the retran's.
10043                          */
10044                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10045                             from_where,
10046                             &now, &now_filled, frag_point, so_locked);
10047                         return;
10048                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10049                         /* if its not from a HB then do it */
10050                         fr_done = 0;
10051                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10052                         if (fr_done) {
10053                                 tot_frs++;
10054                         }
10055                 } else {
10056                         /*
10057                          * its from any other place, we don't allow retran
10058                          * output (only control)
10059                          */
10060                         ret = 1;
10061                 }
10062                 if (ret > 0) {
10063                         /* Can't send anymore */
10064                         /*-
10065                          * now lets push out control by calling med-level
10066                          * output once. this assures that we WILL send HB's
10067                          * if queued too.
10068                          */
10069                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10070                             from_where,
10071                             &now, &now_filled, frag_point, so_locked);
10072 #ifdef SCTP_AUDITING_ENABLED
10073                         sctp_auditing(8, inp, stcb, NULL);
10074 #endif
10075                         sctp_timer_validation(inp, stcb, asoc);
10076                         return;
10077                 }
10078                 if (ret < 0) {
10079                         /*-
10080                          * The count was off.. retran is not happening so do
10081                          * the normal retransmission.
10082                          */
10083 #ifdef SCTP_AUDITING_ENABLED
10084                         sctp_auditing(9, inp, stcb, NULL);
10085 #endif
10086                         if (ret == SCTP_RETRAN_EXIT) {
10087                                 return;
10088                         }
10089                         break;
10090                 }
10091                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10092                         /* Only one transmission allowed out of a timeout */
10093 #ifdef SCTP_AUDITING_ENABLED
10094                         sctp_auditing(10, inp, stcb, NULL);
10095 #endif
10096                         /* Push out any control */
10097                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10098                             &now, &now_filled, frag_point, so_locked);
10099                         return;
10100                 }
10101                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10102                         /* Hit FR burst limit */
10103                         return;
10104                 }
10105                 if ((num_out == 0) && (ret == 0)) {
10106                         /* No more retrans to send */
10107                         break;
10108                 }
10109         }
10110 #ifdef SCTP_AUDITING_ENABLED
10111         sctp_auditing(12, inp, stcb, NULL);
10112 #endif
10113         /* Check for bad destinations, if they exist move chunks around. */
10114         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10115                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10116                         /*-
10117                          * if possible move things off of this address we
10118                          * still may send below due to the dormant state but
10119                          * we try to find an alternate address to send to
10120                          * and if we have one we move all queued data on the
10121                          * out wheel to this alternate address.
10122                          */
10123                         if (net->ref_count > 1)
10124                                 sctp_move_chunks_from_net(stcb, net);
10125                 } else {
10126                         /*-
10127                          * if ((asoc->sat_network) || (net->addr_is_local))
10128                          * { burst_limit = asoc->max_burst *
10129                          * SCTP_SAT_NETWORK_BURST_INCR; }
10130                          */
10131                         if (asoc->max_burst > 0) {
10132                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10133                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10134                                                 /*
10135                                                  * JRS - Use the congestion
10136                                                  * control given in the
10137                                                  * congestion control module
10138                                                  */
10139                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10140                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10141                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10142                                                 }
10143                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10144                                         }
10145                                         net->fast_retran_ip = 0;
10146                                 } else {
10147                                         if (net->flight_size == 0) {
10148                                                 /*
10149                                                  * Should be decaying the
10150                                                  * cwnd here
10151                                                  */
10152                                                 ;
10153                                         }
10154                                 }
10155                         }
10156                 }
10157
10158         }
10159         burst_cnt = 0;
10160         do {
10161                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10162                     &reason_code, 0, from_where,
10163                     &now, &now_filled, frag_point, so_locked);
10164                 if (error) {
10165                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10166                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10167                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10168                         }
10169                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10170                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10171                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10172                         }
10173                         break;
10174                 }
10175                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10176
10177                 tot_out += num_out;
10178                 burst_cnt++;
10179                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10180                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10181                         if (num_out == 0) {
10182                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10183                         }
10184                 }
10185                 if (nagle_on) {
10186                         /*
10187                          * When the Nagle algorithm is used, look at how
10188                          * much is unsent, then if its smaller than an MTU
10189                          * and we have data in flight we stop, except if we
10190                          * are handling a fragmented user message.
10191                          */
10192                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10193                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10194                             (stcb->asoc.total_flight > 0)) {
10195 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10196                                 break;
10197                         }
10198                 }
10199                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10200                     TAILQ_EMPTY(&asoc->send_queue) &&
10201                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10202                         /* Nothing left to send */
10203                         break;
10204                 }
10205                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10206                         /* Nothing left to send */
10207                         break;
10208                 }
10209         } while (num_out &&
10210             ((asoc->max_burst == 0) ||
10211             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10212             (burst_cnt < asoc->max_burst)));
10213
10214         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10215                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10216                         SCTP_STAT_INCR(sctps_maxburstqueued);
10217                         asoc->burst_limit_applied = 1;
10218                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10219                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10220                         }
10221                 } else {
10222                         asoc->burst_limit_applied = 0;
10223                 }
10224         }
10225         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10226                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10227         }
10228         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10229             tot_out);
10230
10231         /*-
10232          * Now we need to clean up the control chunk chain if a ECNE is on
10233          * it. It must be marked as UNSENT again so next call will continue
10234          * to send it until such time that we get a CWR, to remove it.
10235          */
10236         if (stcb->asoc.ecn_echo_cnt_onq)
10237                 sctp_fix_ecn_echo(asoc);
10238
10239         if (stcb->asoc.trigger_reset) {
10240                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10241                         goto do_it_again;
10242                 }
10243         }
10244         return;
10245 }
10246
10247
10248 int
10249 sctp_output(
10250     struct sctp_inpcb *inp,
10251     struct mbuf *m,
10252     struct sockaddr *addr,
10253     struct mbuf *control,
10254     struct thread *p,
10255     int flags)
10256 {
10257         if (inp == NULL) {
10258                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10259                 return (EINVAL);
10260         }
10261
10262         if (inp->sctp_socket == NULL) {
10263                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10264                 return (EINVAL);
10265         }
10266         return (sctp_sosend(inp->sctp_socket,
10267             addr,
10268             (struct uio *)NULL,
10269             m,
10270             control,
10271             flags, p
10272             ));
10273 }
10274
10275 void
10276 send_forward_tsn(struct sctp_tcb *stcb,
10277     struct sctp_association *asoc)
10278 {
10279         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10280         struct sctp_forward_tsn_chunk *fwdtsn;
10281         struct sctp_strseq *strseq;
10282         struct sctp_strseq_mid *strseq_m;
10283         uint32_t advance_peer_ack_point;
10284         unsigned int cnt_of_space, i, ovh;
10285         unsigned int space_needed;
10286         unsigned int cnt_of_skipped = 0;
10287
10288         SCTP_TCB_LOCK_ASSERT(stcb);
10289         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10290                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10291                         /* mark it to unsent */
10292                         chk->sent = SCTP_DATAGRAM_UNSENT;
10293                         chk->snd_count = 0;
10294                         /* Do we correct its output location? */
10295                         if (chk->whoTo) {
10296                                 sctp_free_remote_addr(chk->whoTo);
10297                                 chk->whoTo = NULL;
10298                         }
10299                         goto sctp_fill_in_rest;
10300                 }
10301         }
10302         /* Ok if we reach here we must build one */
10303         sctp_alloc_a_chunk(stcb, chk);
10304         if (chk == NULL) {
10305                 return;
10306         }
10307         asoc->fwd_tsn_cnt++;
10308         chk->copy_by_ref = 0;
10309         /*
10310          * We don't do the old thing here since this is used not for on-wire
10311          * but to tell if we are sending a fwd-tsn by the stack during
10312          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10313          */
10314         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10315         chk->rec.chunk_id.can_take_data = 0;
10316         chk->flags = 0;
10317         chk->asoc = asoc;
10318         chk->whoTo = NULL;
10319         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10320         if (chk->data == NULL) {
10321                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10322                 return;
10323         }
10324         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10325         chk->sent = SCTP_DATAGRAM_UNSENT;
10326         chk->snd_count = 0;
10327         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10328         asoc->ctrl_queue_cnt++;
10329 sctp_fill_in_rest:
10330         /*-
10331          * Here we go through and fill out the part that deals with
10332          * stream/seq of the ones we skip.
10333          */
10334         SCTP_BUF_LEN(chk->data) = 0;
10335         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10336                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10337                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10338                         /* no more to look at */
10339                         break;
10340                 }
10341                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10342                         /* We don't report these */
10343                         continue;
10344                 }
10345                 cnt_of_skipped++;
10346         }
10347         if (asoc->idata_supported) {
10348                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10349                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10350         } else {
10351                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10352                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10353         }
10354         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10355
10356         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10357                 ovh = SCTP_MIN_OVERHEAD;
10358         } else {
10359                 ovh = SCTP_MIN_V4_OVERHEAD;
10360         }
10361         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10362                 /* trim to a mtu size */
10363                 cnt_of_space = asoc->smallest_mtu - ovh;
10364         }
10365         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10366                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10367                     0xff, 0, cnt_of_skipped,
10368                     asoc->advanced_peer_ack_point);
10369         }
10370         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10371         if (cnt_of_space < space_needed) {
10372                 /*-
10373                  * ok we must trim down the chunk by lowering the
10374                  * advance peer ack point.
10375                  */
10376                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10377                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10378                             0xff, 0xff, cnt_of_space,
10379                             space_needed);
10380                 }
10381                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10382                 if (asoc->idata_supported) {
10383                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10384                 } else {
10385                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10386                 }
10387                 /*-
10388                  * Go through and find the TSN that will be the one
10389                  * we report.
10390                  */
10391                 at = TAILQ_FIRST(&asoc->sent_queue);
10392                 if (at != NULL) {
10393                         for (i = 0; i < cnt_of_skipped; i++) {
10394                                 tp1 = TAILQ_NEXT(at, sctp_next);
10395                                 if (tp1 == NULL) {
10396                                         break;
10397                                 }
10398                                 at = tp1;
10399                         }
10400                 }
10401                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10402                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10403                             0xff, cnt_of_skipped, at->rec.data.tsn,
10404                             asoc->advanced_peer_ack_point);
10405                 }
10406                 last = at;
10407                 /*-
10408                  * last now points to last one I can report, update
10409                  * peer ack point
10410                  */
10411                 if (last) {
10412                         advance_peer_ack_point = last->rec.data.tsn;
10413                 }
10414                 if (asoc->idata_supported) {
10415                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10416                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10417                 } else {
10418                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10419                             cnt_of_skipped * sizeof(struct sctp_strseq);
10420                 }
10421         }
10422         chk->send_size = space_needed;
10423         /* Setup the chunk */
10424         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10425         fwdtsn->ch.chunk_length = htons(chk->send_size);
10426         fwdtsn->ch.chunk_flags = 0;
10427         if (asoc->idata_supported) {
10428                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10429         } else {
10430                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10431         }
10432         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10433         SCTP_BUF_LEN(chk->data) = chk->send_size;
10434         fwdtsn++;
10435         /*-
10436          * Move pointer to after the fwdtsn and transfer to the
10437          * strseq pointer.
10438          */
10439         if (asoc->idata_supported) {
10440                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10441                 strseq = NULL;
10442         } else {
10443                 strseq = (struct sctp_strseq *)fwdtsn;
10444                 strseq_m = NULL;
10445         }
10446         /*-
10447          * Now populate the strseq list. This is done blindly
10448          * without pulling out duplicate stream info. This is
10449          * inefficent but won't harm the process since the peer will
10450          * look at these in sequence and will thus release anything.
10451          * It could mean we exceed the PMTU and chop off some that
10452          * we could have included.. but this is unlikely (aka 1432/4
10453          * would mean 300+ stream seq's would have to be reported in
10454          * one FWD-TSN. With a bit of work we can later FIX this to
10455          * optimize and pull out duplicates.. but it does add more
10456          * overhead. So for now... not!
10457          */
10458         i = 0;
10459         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10460                 if (i >= cnt_of_skipped) {
10461                         break;
10462                 }
10463                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10464                         /* We don't report these */
10465                         continue;
10466                 }
10467                 if (at->rec.data.tsn == advance_peer_ack_point) {
10468                         at->rec.data.fwd_tsn_cnt = 0;
10469                 }
10470                 if (asoc->idata_supported) {
10471                         strseq_m->sid = htons(at->rec.data.sid);
10472                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10473                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10474                         } else {
10475                                 strseq_m->flags = 0;
10476                         }
10477                         strseq_m->mid = htonl(at->rec.data.mid);
10478                         strseq_m++;
10479                 } else {
10480                         strseq->sid = htons(at->rec.data.sid);
10481                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10482                         strseq++;
10483                 }
10484                 i++;
10485         }
10486         return;
10487 }
10488
10489 void
10490 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10491 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10492     SCTP_UNUSED
10493 #endif
10494 )
10495 {
10496         /*-
10497          * Queue up a SACK or NR-SACK in the control queue.
10498          * We must first check to see if a SACK or NR-SACK is
10499          * somehow on the control queue.
10500          * If so, we will take and and remove the old one.
10501          */
10502         struct sctp_association *asoc;
10503         struct sctp_tmit_chunk *chk, *a_chk;
10504         struct sctp_sack_chunk *sack;
10505         struct sctp_nr_sack_chunk *nr_sack;
10506         struct sctp_gap_ack_block *gap_descriptor;
10507         const struct sack_track *selector;
10508         int mergeable = 0;
10509         int offset;
10510         caddr_t limit;
10511         uint32_t *dup;
10512         int limit_reached = 0;
10513         unsigned int i, siz, j;
10514         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10515         int num_dups = 0;
10516         int space_req;
10517         uint32_t highest_tsn;
10518         uint8_t flags;
10519         uint8_t type;
10520         uint8_t tsn_map;
10521
10522         if (stcb->asoc.nrsack_supported == 1) {
10523                 type = SCTP_NR_SELECTIVE_ACK;
10524         } else {
10525                 type = SCTP_SELECTIVE_ACK;
10526         }
10527         a_chk = NULL;
10528         asoc = &stcb->asoc;
10529         SCTP_TCB_LOCK_ASSERT(stcb);
10530         if (asoc->last_data_chunk_from == NULL) {
10531                 /* Hmm we never received anything */
10532                 return;
10533         }
10534         sctp_slide_mapping_arrays(stcb);
10535         sctp_set_rwnd(stcb, asoc);
10536         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10537                 if (chk->rec.chunk_id.id == type) {
10538                         /* Hmm, found a sack already on queue, remove it */
10539                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10540                         asoc->ctrl_queue_cnt--;
10541                         a_chk = chk;
10542                         if (a_chk->data) {
10543                                 sctp_m_freem(a_chk->data);
10544                                 a_chk->data = NULL;
10545                         }
10546                         if (a_chk->whoTo) {
10547                                 sctp_free_remote_addr(a_chk->whoTo);
10548                                 a_chk->whoTo = NULL;
10549                         }
10550                         break;
10551                 }
10552         }
10553         if (a_chk == NULL) {
10554                 sctp_alloc_a_chunk(stcb, a_chk);
10555                 if (a_chk == NULL) {
10556                         /* No memory so we drop the idea, and set a timer */
10557                         if (stcb->asoc.delayed_ack) {
10558                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10559                                     stcb->sctp_ep, stcb, NULL,
10560                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10561                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10562                                     stcb->sctp_ep, stcb, NULL);
10563                         } else {
10564                                 stcb->asoc.send_sack = 1;
10565                         }
10566                         return;
10567                 }
10568                 a_chk->copy_by_ref = 0;
10569                 a_chk->rec.chunk_id.id = type;
10570                 a_chk->rec.chunk_id.can_take_data = 1;
10571         }
10572         /* Clear our pkt counts */
10573         asoc->data_pkts_seen = 0;
10574
10575         a_chk->flags = 0;
10576         a_chk->asoc = asoc;
10577         a_chk->snd_count = 0;
10578         a_chk->send_size = 0;   /* fill in later */
10579         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10580         a_chk->whoTo = NULL;
10581
10582         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10583                 /*-
10584                  * Ok, the destination for the SACK is unreachable, lets see if
10585                  * we can select an alternate to asoc->last_data_chunk_from
10586                  */
10587                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10588                 if (a_chk->whoTo == NULL) {
10589                         /* Nope, no alternate */
10590                         a_chk->whoTo = asoc->last_data_chunk_from;
10591                 }
10592         } else {
10593                 a_chk->whoTo = asoc->last_data_chunk_from;
10594         }
10595         if (a_chk->whoTo) {
10596                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10597         }
10598         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10599                 highest_tsn = asoc->highest_tsn_inside_map;
10600         } else {
10601                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10602         }
10603         if (highest_tsn == asoc->cumulative_tsn) {
10604                 /* no gaps */
10605                 if (type == SCTP_SELECTIVE_ACK) {
10606                         space_req = sizeof(struct sctp_sack_chunk);
10607                 } else {
10608                         space_req = sizeof(struct sctp_nr_sack_chunk);
10609                 }
10610         } else {
10611                 /* gaps get a cluster */
10612                 space_req = MCLBYTES;
10613         }
10614         /* Ok now lets formulate a MBUF with our sack */
10615         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10616         if ((a_chk->data == NULL) ||
10617             (a_chk->whoTo == NULL)) {
10618                 /* rats, no mbuf memory */
10619                 if (a_chk->data) {
10620                         /* was a problem with the destination */
10621                         sctp_m_freem(a_chk->data);
10622                         a_chk->data = NULL;
10623                 }
10624                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10625                 /* sa_ignore NO_NULL_CHK */
10626                 if (stcb->asoc.delayed_ack) {
10627                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10628                             stcb->sctp_ep, stcb, NULL,
10629                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10630                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10631                             stcb->sctp_ep, stcb, NULL);
10632                 } else {
10633                         stcb->asoc.send_sack = 1;
10634                 }
10635                 return;
10636         }
10637         /* ok, lets go through and fill it in */
10638         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10639         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10640         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10641                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10642         }
10643         limit = mtod(a_chk->data, caddr_t);
10644         limit += space;
10645
10646         flags = 0;
10647
10648         if ((asoc->sctp_cmt_on_off > 0) &&
10649             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10650                 /*-
10651                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10652                  * received, then set high bit to 1, else 0. Reset
10653                  * pkts_rcvd.
10654                  */
10655                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10656                 asoc->cmt_dac_pkts_rcvd = 0;
10657         }
10658 #ifdef SCTP_ASOCLOG_OF_TSNS
10659         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10660         stcb->asoc.cumack_log_atsnt++;
10661         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10662                 stcb->asoc.cumack_log_atsnt = 0;
10663         }
10664 #endif
10665         /* reset the readers interpretation */
10666         stcb->freed_by_sorcv_sincelast = 0;
10667
10668         if (type == SCTP_SELECTIVE_ACK) {
10669                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10670                 nr_sack = NULL;
10671                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10672                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10673                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10674                 } else {
10675                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10676                 }
10677         } else {
10678                 sack = NULL;
10679                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10680                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10681                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10682                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10683                 } else {
10684                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10685                 }
10686         }
10687
10688         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10689                 offset = 1;
10690         } else {
10691                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10692         }
10693         if (((type == SCTP_SELECTIVE_ACK) &&
10694             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10695             ((type == SCTP_NR_SELECTIVE_ACK) &&
10696             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10697                 /* we have a gap .. maybe */
10698                 for (i = 0; i < siz; i++) {
10699                         tsn_map = asoc->mapping_array[i];
10700                         if (type == SCTP_SELECTIVE_ACK) {
10701                                 tsn_map |= asoc->nr_mapping_array[i];
10702                         }
10703                         if (i == 0) {
10704                                 /*
10705                                  * Clear all bits corresponding to TSNs
10706                                  * smaller or equal to the cumulative TSN.
10707                                  */
10708                                 tsn_map &= (~0U << (1 - offset));
10709                         }
10710                         selector = &sack_array[tsn_map];
10711                         if (mergeable && selector->right_edge) {
10712                                 /*
10713                                  * Backup, left and right edges were ok to
10714                                  * merge.
10715                                  */
10716                                 num_gap_blocks--;
10717                                 gap_descriptor--;
10718                         }
10719                         if (selector->num_entries == 0)
10720                                 mergeable = 0;
10721                         else {
10722                                 for (j = 0; j < selector->num_entries; j++) {
10723                                         if (mergeable && selector->right_edge) {
10724                                                 /*
10725                                                  * do a merge by NOT setting
10726                                                  * the left side
10727                                                  */
10728                                                 mergeable = 0;
10729                                         } else {
10730                                                 /*
10731                                                  * no merge, set the left
10732                                                  * side
10733                                                  */
10734                                                 mergeable = 0;
10735                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10736                                         }
10737                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10738                                         num_gap_blocks++;
10739                                         gap_descriptor++;
10740                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10741                                                 /* no more room */
10742                                                 limit_reached = 1;
10743                                                 break;
10744                                         }
10745                                 }
10746                                 if (selector->left_edge) {
10747                                         mergeable = 1;
10748                                 }
10749                         }
10750                         if (limit_reached) {
10751                                 /* Reached the limit stop */
10752                                 break;
10753                         }
10754                         offset += 8;
10755                 }
10756         }
10757         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10758             (limit_reached == 0)) {
10759
10760                 mergeable = 0;
10761
10762                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10763                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10764                 } else {
10765                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10766                 }
10767
10768                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10769                         offset = 1;
10770                 } else {
10771                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10772                 }
10773                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10774                         /* we have a gap .. maybe */
10775                         for (i = 0; i < siz; i++) {
10776                                 tsn_map = asoc->nr_mapping_array[i];
10777                                 if (i == 0) {
10778                                         /*
10779                                          * Clear all bits corresponding to
10780                                          * TSNs smaller or equal to the
10781                                          * cumulative TSN.
10782                                          */
10783                                         tsn_map &= (~0U << (1 - offset));
10784                                 }
10785                                 selector = &sack_array[tsn_map];
10786                                 if (mergeable && selector->right_edge) {
10787                                         /*
10788                                          * Backup, left and right edges were
10789                                          * ok to merge.
10790                                          */
10791                                         num_nr_gap_blocks--;
10792                                         gap_descriptor--;
10793                                 }
10794                                 if (selector->num_entries == 0)
10795                                         mergeable = 0;
10796                                 else {
10797                                         for (j = 0; j < selector->num_entries; j++) {
10798                                                 if (mergeable && selector->right_edge) {
10799                                                         /*
10800                                                          * do a merge by NOT
10801                                                          * setting the left
10802                                                          * side
10803                                                          */
10804                                                         mergeable = 0;
10805                                                 } else {
10806                                                         /*
10807                                                          * no merge, set the
10808                                                          * left side
10809                                                          */
10810                                                         mergeable = 0;
10811                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10812                                                 }
10813                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10814                                                 num_nr_gap_blocks++;
10815                                                 gap_descriptor++;
10816                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10817                                                         /* no more room */
10818                                                         limit_reached = 1;
10819                                                         break;
10820                                                 }
10821                                         }
10822                                         if (selector->left_edge) {
10823                                                 mergeable = 1;
10824                                         }
10825                                 }
10826                                 if (limit_reached) {
10827                                         /* Reached the limit stop */
10828                                         break;
10829                                 }
10830                                 offset += 8;
10831                         }
10832                 }
10833         }
10834         /* now we must add any dups we are going to report. */
10835         if ((limit_reached == 0) && (asoc->numduptsns)) {
10836                 dup = (uint32_t *)gap_descriptor;
10837                 for (i = 0; i < asoc->numduptsns; i++) {
10838                         *dup = htonl(asoc->dup_tsns[i]);
10839                         dup++;
10840                         num_dups++;
10841                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10842                                 /* no more room */
10843                                 break;
10844                         }
10845                 }
10846                 asoc->numduptsns = 0;
10847         }
10848         /*
10849          * now that the chunk is prepared queue it to the control chunk
10850          * queue.
10851          */
10852         if (type == SCTP_SELECTIVE_ACK) {
10853                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10854                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10855                     num_dups * sizeof(int32_t));
10856                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10857                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10858                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10859                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10860                 sack->sack.num_dup_tsns = htons(num_dups);
10861                 sack->ch.chunk_type = type;
10862                 sack->ch.chunk_flags = flags;
10863                 sack->ch.chunk_length = htons(a_chk->send_size);
10864         } else {
10865                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10866                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10867                     num_dups * sizeof(int32_t));
10868                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10869                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10870                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10871                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10872                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10873                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10874                 nr_sack->nr_sack.reserved = 0;
10875                 nr_sack->ch.chunk_type = type;
10876                 nr_sack->ch.chunk_flags = flags;
10877                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10878         }
10879         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10880         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10881         asoc->ctrl_queue_cnt++;
10882         asoc->send_sack = 0;
10883         SCTP_STAT_INCR(sctps_sendsacks);
10884         return;
10885 }
10886
10887 void
10888 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10889 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10890     SCTP_UNUSED
10891 #endif
10892 )
10893 {
10894         struct mbuf *m_abort, *m, *m_last;
10895         struct mbuf *m_out, *m_end = NULL;
10896         struct sctp_abort_chunk *abort;
10897         struct sctp_auth_chunk *auth = NULL;
10898         struct sctp_nets *net;
10899         uint32_t vtag;
10900         uint32_t auth_offset = 0;
10901         int error;
10902         uint16_t cause_len, chunk_len, padding_len;
10903
10904         SCTP_TCB_LOCK_ASSERT(stcb);
10905         /*-
10906          * Add an AUTH chunk, if chunk requires it and save the offset into
10907          * the chain for AUTH
10908          */
10909         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10910             stcb->asoc.peer_auth_chunks)) {
10911                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10912                     stcb, SCTP_ABORT_ASSOCIATION);
10913                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10914         } else {
10915                 m_out = NULL;
10916         }
10917         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10918         if (m_abort == NULL) {
10919                 if (m_out) {
10920                         sctp_m_freem(m_out);
10921                 }
10922                 if (operr) {
10923                         sctp_m_freem(operr);
10924                 }
10925                 return;
10926         }
10927         /* link in any error */
10928         SCTP_BUF_NEXT(m_abort) = operr;
10929         cause_len = 0;
10930         m_last = NULL;
10931         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10932                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10933                 if (SCTP_BUF_NEXT(m) == NULL) {
10934                         m_last = m;
10935                 }
10936         }
10937         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10938         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10939         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10940         if (m_out == NULL) {
10941                 /* NO Auth chunk prepended, so reserve space in front */
10942                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10943                 m_out = m_abort;
10944         } else {
10945                 /* Put AUTH chunk at the front of the chain */
10946                 SCTP_BUF_NEXT(m_end) = m_abort;
10947         }
10948         if (stcb->asoc.alternate) {
10949                 net = stcb->asoc.alternate;
10950         } else {
10951                 net = stcb->asoc.primary_destination;
10952         }
10953         /* Fill in the ABORT chunk header. */
10954         abort = mtod(m_abort, struct sctp_abort_chunk *);
10955         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10956         if (stcb->asoc.peer_vtag == 0) {
10957                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10958                 vtag = stcb->asoc.my_vtag;
10959                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10960         } else {
10961                 vtag = stcb->asoc.peer_vtag;
10962                 abort->ch.chunk_flags = 0;
10963         }
10964         abort->ch.chunk_length = htons(chunk_len);
10965         /* Add padding, if necessary. */
10966         if (padding_len > 0) {
10967                 if ((m_last == NULL) ||
10968                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10969                         sctp_m_freem(m_out);
10970                         return;
10971                 }
10972         }
10973         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10974             (struct sockaddr *)&net->ro._l_addr,
10975             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10976             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10977             stcb->asoc.primary_destination->port, NULL,
10978             0, 0,
10979             so_locked))) {
10980                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10981                 if (error == ENOBUFS) {
10982                         stcb->asoc.ifp_had_enobuf = 1;
10983                         SCTP_STAT_INCR(sctps_lowlevelerr);
10984                 }
10985         } else {
10986                 stcb->asoc.ifp_had_enobuf = 0;
10987         }
10988         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10989 }
10990
10991 void
10992 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10993     struct sctp_nets *net,
10994     int reflect_vtag)
10995 {
10996         /* formulate and SEND a SHUTDOWN-COMPLETE */
10997         struct mbuf *m_shutdown_comp;
10998         struct sctp_shutdown_complete_chunk *shutdown_complete;
10999         uint32_t vtag;
11000         int error;
11001         uint8_t flags;
11002
11003         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11004         if (m_shutdown_comp == NULL) {
11005                 /* no mbuf's */
11006                 return;
11007         }
11008         if (reflect_vtag) {
11009                 flags = SCTP_HAD_NO_TCB;
11010                 vtag = stcb->asoc.my_vtag;
11011         } else {
11012                 flags = 0;
11013                 vtag = stcb->asoc.peer_vtag;
11014         }
11015         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11016         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11017         shutdown_complete->ch.chunk_flags = flags;
11018         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11019         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11020         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11021             (struct sockaddr *)&net->ro._l_addr,
11022             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11023             stcb->sctp_ep->sctp_lport, stcb->rport,
11024             htonl(vtag),
11025             net->port, NULL,
11026             0, 0,
11027             SCTP_SO_NOT_LOCKED))) {
11028                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11029                 if (error == ENOBUFS) {
11030                         stcb->asoc.ifp_had_enobuf = 1;
11031                         SCTP_STAT_INCR(sctps_lowlevelerr);
11032                 }
11033         } else {
11034                 stcb->asoc.ifp_had_enobuf = 0;
11035         }
11036         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11037         return;
11038 }
11039
11040 static void
11041 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11042     struct sctphdr *sh, uint32_t vtag,
11043     uint8_t type, struct mbuf *cause,
11044     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11045     uint32_t vrf_id, uint16_t port)
11046 {
11047         struct mbuf *o_pak;
11048         struct mbuf *mout;
11049         struct sctphdr *shout;
11050         struct sctp_chunkhdr *ch;
11051 #if defined(INET) || defined(INET6)
11052         struct udphdr *udp;
11053 #endif
11054         int ret, len, cause_len, padding_len;
11055 #ifdef INET
11056         struct sockaddr_in *src_sin, *dst_sin;
11057         struct ip *ip;
11058 #endif
11059 #ifdef INET6
11060         struct sockaddr_in6 *src_sin6, *dst_sin6;
11061         struct ip6_hdr *ip6;
11062 #endif
11063
11064         /* Compute the length of the cause and add final padding. */
11065         cause_len = 0;
11066         if (cause != NULL) {
11067                 struct mbuf *m_at, *m_last = NULL;
11068
11069                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11070                         if (SCTP_BUF_NEXT(m_at) == NULL)
11071                                 m_last = m_at;
11072                         cause_len += SCTP_BUF_LEN(m_at);
11073                 }
11074                 padding_len = cause_len % 4;
11075                 if (padding_len != 0) {
11076                         padding_len = 4 - padding_len;
11077                 }
11078                 if (padding_len != 0) {
11079                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11080                                 sctp_m_freem(cause);
11081                                 return;
11082                         }
11083                 }
11084         } else {
11085                 padding_len = 0;
11086         }
11087         /* Get an mbuf for the header. */
11088         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11089         switch (dst->sa_family) {
11090 #ifdef INET
11091         case AF_INET:
11092                 len += sizeof(struct ip);
11093                 break;
11094 #endif
11095 #ifdef INET6
11096         case AF_INET6:
11097                 len += sizeof(struct ip6_hdr);
11098                 break;
11099 #endif
11100         default:
11101                 break;
11102         }
11103 #if defined(INET) || defined(INET6)
11104         if (port) {
11105                 len += sizeof(struct udphdr);
11106         }
11107 #endif
11108         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11109         if (mout == NULL) {
11110                 if (cause) {
11111                         sctp_m_freem(cause);
11112                 }
11113                 return;
11114         }
11115         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11116         SCTP_BUF_LEN(mout) = len;
11117         SCTP_BUF_NEXT(mout) = cause;
11118         M_SETFIB(mout, fibnum);
11119         mout->m_pkthdr.flowid = mflowid;
11120         M_HASHTYPE_SET(mout, mflowtype);
11121 #ifdef INET
11122         ip = NULL;
11123 #endif
11124 #ifdef INET6
11125         ip6 = NULL;
11126 #endif
11127         switch (dst->sa_family) {
11128 #ifdef INET
11129         case AF_INET:
11130                 src_sin = (struct sockaddr_in *)src;
11131                 dst_sin = (struct sockaddr_in *)dst;
11132                 ip = mtod(mout, struct ip *);
11133                 ip->ip_v = IPVERSION;
11134                 ip->ip_hl = (sizeof(struct ip) >> 2);
11135                 ip->ip_tos = 0;
11136                 ip->ip_off = htons(IP_DF);
11137                 ip_fillid(ip);
11138                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11139                 if (port) {
11140                         ip->ip_p = IPPROTO_UDP;
11141                 } else {
11142                         ip->ip_p = IPPROTO_SCTP;
11143                 }
11144                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11145                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11146                 ip->ip_sum = 0;
11147                 len = sizeof(struct ip);
11148                 shout = (struct sctphdr *)((caddr_t)ip + len);
11149                 break;
11150 #endif
11151 #ifdef INET6
11152         case AF_INET6:
11153                 src_sin6 = (struct sockaddr_in6 *)src;
11154                 dst_sin6 = (struct sockaddr_in6 *)dst;
11155                 ip6 = mtod(mout, struct ip6_hdr *);
11156                 ip6->ip6_flow = htonl(0x60000000);
11157                 if (V_ip6_auto_flowlabel) {
11158                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11159                 }
11160                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11161                 if (port) {
11162                         ip6->ip6_nxt = IPPROTO_UDP;
11163                 } else {
11164                         ip6->ip6_nxt = IPPROTO_SCTP;
11165                 }
11166                 ip6->ip6_src = dst_sin6->sin6_addr;
11167                 ip6->ip6_dst = src_sin6->sin6_addr;
11168                 len = sizeof(struct ip6_hdr);
11169                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11170                 break;
11171 #endif
11172         default:
11173                 len = 0;
11174                 shout = mtod(mout, struct sctphdr *);
11175                 break;
11176         }
11177 #if defined(INET) || defined(INET6)
11178         if (port) {
11179                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11180                         sctp_m_freem(mout);
11181                         return;
11182                 }
11183                 udp = (struct udphdr *)shout;
11184                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11185                 udp->uh_dport = port;
11186                 udp->uh_sum = 0;
11187                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11188                     sizeof(struct sctphdr) +
11189                     sizeof(struct sctp_chunkhdr) +
11190                     cause_len + padding_len));
11191                 len += sizeof(struct udphdr);
11192                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11193         } else {
11194                 udp = NULL;
11195         }
11196 #endif
11197         shout->src_port = sh->dest_port;
11198         shout->dest_port = sh->src_port;
11199         shout->checksum = 0;
11200         if (vtag) {
11201                 shout->v_tag = htonl(vtag);
11202         } else {
11203                 shout->v_tag = sh->v_tag;
11204         }
11205         len += sizeof(struct sctphdr);
11206         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11207         ch->chunk_type = type;
11208         if (vtag) {
11209                 ch->chunk_flags = 0;
11210         } else {
11211                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11212         }
11213         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11214         len += sizeof(struct sctp_chunkhdr);
11215         len += cause_len + padding_len;
11216
11217         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11218                 sctp_m_freem(mout);
11219                 return;
11220         }
11221         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11222         switch (dst->sa_family) {
11223 #ifdef INET
11224         case AF_INET:
11225                 if (port) {
11226                         if (V_udp_cksum) {
11227                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11228                         } else {
11229                                 udp->uh_sum = 0;
11230                         }
11231                 }
11232                 ip->ip_len = htons(len);
11233                 if (port) {
11234                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11235                         SCTP_STAT_INCR(sctps_sendswcrc);
11236                         if (V_udp_cksum) {
11237                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11238                         }
11239                 } else {
11240                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11241                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11242                         SCTP_STAT_INCR(sctps_sendhwcrc);
11243                 }
11244 #ifdef SCTP_PACKET_LOGGING
11245                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11246                         sctp_packet_log(o_pak);
11247                 }
11248 #endif
11249                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11250                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11251                 break;
11252 #endif
11253 #ifdef INET6
11254         case AF_INET6:
11255                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11256                 if (port) {
11257                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11258                         SCTP_STAT_INCR(sctps_sendswcrc);
11259                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11260                                 udp->uh_sum = 0xffff;
11261                         }
11262                 } else {
11263                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11264                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11265                         SCTP_STAT_INCR(sctps_sendhwcrc);
11266                 }
11267 #ifdef SCTP_PACKET_LOGGING
11268                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11269                         sctp_packet_log(o_pak);
11270                 }
11271 #endif
11272                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11273                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11274                 break;
11275 #endif
11276         default:
11277                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11278                     dst->sa_family);
11279                 sctp_m_freem(mout);
11280                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11281                 return;
11282         }
11283         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11284         if (port) {
11285                 UDPSTAT_INC(udps_opackets);
11286         }
11287         SCTP_STAT_INCR(sctps_sendpackets);
11288         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11289         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11290         if (ret) {
11291                 SCTP_STAT_INCR(sctps_senderrors);
11292         }
11293         return;
11294 }
11295
11296 void
11297 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11298     struct sctphdr *sh,
11299     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11300     uint32_t vrf_id, uint16_t port)
11301 {
11302         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11303             mflowtype, mflowid, fibnum,
11304             vrf_id, port);
11305 }
11306
11307 void
11308 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11309 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11310     SCTP_UNUSED
11311 #endif
11312 )
11313 {
11314         struct sctp_tmit_chunk *chk;
11315         struct sctp_heartbeat_chunk *hb;
11316         struct timeval now;
11317
11318         SCTP_TCB_LOCK_ASSERT(stcb);
11319         if (net == NULL) {
11320                 return;
11321         }
11322         (void)SCTP_GETTIME_TIMEVAL(&now);
11323         switch (net->ro._l_addr.sa.sa_family) {
11324 #ifdef INET
11325         case AF_INET:
11326                 break;
11327 #endif
11328 #ifdef INET6
11329         case AF_INET6:
11330                 break;
11331 #endif
11332         default:
11333                 return;
11334         }
11335         sctp_alloc_a_chunk(stcb, chk);
11336         if (chk == NULL) {
11337                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11338                 return;
11339         }
11340
11341         chk->copy_by_ref = 0;
11342         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11343         chk->rec.chunk_id.can_take_data = 1;
11344         chk->flags = 0;
11345         chk->asoc = &stcb->asoc;
11346         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11347
11348         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11349         if (chk->data == NULL) {
11350                 sctp_free_a_chunk(stcb, chk, so_locked);
11351                 return;
11352         }
11353         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11354         SCTP_BUF_LEN(chk->data) = chk->send_size;
11355         chk->sent = SCTP_DATAGRAM_UNSENT;
11356         chk->snd_count = 0;
11357         chk->whoTo = net;
11358         atomic_add_int(&chk->whoTo->ref_count, 1);
11359         /* Now we have a mbuf that we can fill in with the details */
11360         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11361         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11362         /* fill out chunk header */
11363         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11364         hb->ch.chunk_flags = 0;
11365         hb->ch.chunk_length = htons(chk->send_size);
11366         /* Fill out hb parameter */
11367         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11368         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11369         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11370         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11371         /* Did our user request this one, put it in */
11372         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11373         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11374         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11375                 /*
11376                  * we only take from the entropy pool if the address is not
11377                  * confirmed.
11378                  */
11379                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11380                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11381         } else {
11382                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11383                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11384         }
11385         switch (net->ro._l_addr.sa.sa_family) {
11386 #ifdef INET
11387         case AF_INET:
11388                 memcpy(hb->heartbeat.hb_info.address,
11389                     &net->ro._l_addr.sin.sin_addr,
11390                     sizeof(net->ro._l_addr.sin.sin_addr));
11391                 break;
11392 #endif
11393 #ifdef INET6
11394         case AF_INET6:
11395                 memcpy(hb->heartbeat.hb_info.address,
11396                     &net->ro._l_addr.sin6.sin6_addr,
11397                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11398                 break;
11399 #endif
11400         default:
11401                 if (chk->data) {
11402                         sctp_m_freem(chk->data);
11403                         chk->data = NULL;
11404                 }
11405                 sctp_free_a_chunk(stcb, chk, so_locked);
11406                 return;
11407                 break;
11408         }
11409         net->hb_responded = 0;
11410         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11411         stcb->asoc.ctrl_queue_cnt++;
11412         SCTP_STAT_INCR(sctps_sendheartbeat);
11413         return;
11414 }
11415
11416 void
11417 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11418     uint32_t high_tsn)
11419 {
11420         struct sctp_association *asoc;
11421         struct sctp_ecne_chunk *ecne;
11422         struct sctp_tmit_chunk *chk;
11423
11424         if (net == NULL) {
11425                 return;
11426         }
11427         asoc = &stcb->asoc;
11428         SCTP_TCB_LOCK_ASSERT(stcb);
11429         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11430                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11431                         /* found a previous ECN_ECHO update it if needed */
11432                         uint32_t cnt, ctsn;
11433
11434                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11435                         ctsn = ntohl(ecne->tsn);
11436                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11437                                 ecne->tsn = htonl(high_tsn);
11438                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11439                         }
11440                         cnt = ntohl(ecne->num_pkts_since_cwr);
11441                         cnt++;
11442                         ecne->num_pkts_since_cwr = htonl(cnt);
11443                         return;
11444                 }
11445         }
11446         /* nope could not find one to update so we must build one */
11447         sctp_alloc_a_chunk(stcb, chk);
11448         if (chk == NULL) {
11449                 return;
11450         }
11451         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11452         chk->copy_by_ref = 0;
11453         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11454         chk->rec.chunk_id.can_take_data = 0;
11455         chk->flags = 0;
11456         chk->asoc = &stcb->asoc;
11457         chk->send_size = sizeof(struct sctp_ecne_chunk);
11458         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11459         if (chk->data == NULL) {
11460                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11461                 return;
11462         }
11463         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11464         SCTP_BUF_LEN(chk->data) = chk->send_size;
11465         chk->sent = SCTP_DATAGRAM_UNSENT;
11466         chk->snd_count = 0;
11467         chk->whoTo = net;
11468         atomic_add_int(&chk->whoTo->ref_count, 1);
11469
11470         stcb->asoc.ecn_echo_cnt_onq++;
11471         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11472         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11473         ecne->ch.chunk_flags = 0;
11474         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11475         ecne->tsn = htonl(high_tsn);
11476         ecne->num_pkts_since_cwr = htonl(1);
11477         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11478         asoc->ctrl_queue_cnt++;
11479 }
11480
11481 void
11482 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11483     struct mbuf *m, int len, int iphlen, int bad_crc)
11484 {
11485         struct sctp_association *asoc;
11486         struct sctp_pktdrop_chunk *drp;
11487         struct sctp_tmit_chunk *chk;
11488         uint8_t *datap;
11489         int was_trunc = 0;
11490         int fullsz = 0;
11491         long spc;
11492         int offset;
11493         struct sctp_chunkhdr *ch, chunk_buf;
11494         unsigned int chk_length;
11495
11496         if (!stcb) {
11497                 return;
11498         }
11499         asoc = &stcb->asoc;
11500         SCTP_TCB_LOCK_ASSERT(stcb);
11501         if (asoc->pktdrop_supported == 0) {
11502                 /*-
11503                  * peer must declare support before I send one.
11504                  */
11505                 return;
11506         }
11507         if (stcb->sctp_socket == NULL) {
11508                 return;
11509         }
11510         sctp_alloc_a_chunk(stcb, chk);
11511         if (chk == NULL) {
11512                 return;
11513         }
11514         chk->copy_by_ref = 0;
11515         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11516         chk->rec.chunk_id.can_take_data = 1;
11517         chk->flags = 0;
11518         len -= iphlen;
11519         chk->send_size = len;
11520         /* Validate that we do not have an ABORT in here. */
11521         offset = iphlen + sizeof(struct sctphdr);
11522         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11523             sizeof(*ch), (uint8_t *)&chunk_buf);
11524         while (ch != NULL) {
11525                 chk_length = ntohs(ch->chunk_length);
11526                 if (chk_length < sizeof(*ch)) {
11527                         /* break to abort land */
11528                         break;
11529                 }
11530                 switch (ch->chunk_type) {
11531                 case SCTP_PACKET_DROPPED:
11532                 case SCTP_ABORT_ASSOCIATION:
11533                 case SCTP_INITIATION_ACK:
11534                         /**
11535                          * We don't respond with an PKT-DROP to an ABORT
11536                          * or PKT-DROP. We also do not respond to an
11537                          * INIT-ACK, because we can't know if the initiation
11538                          * tag is correct or not.
11539                          */
11540                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11541                         return;
11542                 default:
11543                         break;
11544                 }
11545                 offset += SCTP_SIZE32(chk_length);
11546                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11547                     sizeof(*ch), (uint8_t *)&chunk_buf);
11548         }
11549
11550         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11551             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11552                 /*
11553                  * only send 1 mtu worth, trim off the excess on the end.
11554                  */
11555                 fullsz = len;
11556                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11557                 was_trunc = 1;
11558         }
11559         chk->asoc = &stcb->asoc;
11560         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11561         if (chk->data == NULL) {
11562 jump_out:
11563                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11564                 return;
11565         }
11566         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11567         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11568         if (drp == NULL) {
11569                 sctp_m_freem(chk->data);
11570                 chk->data = NULL;
11571                 goto jump_out;
11572         }
11573         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11574             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11575         chk->book_size_scale = 0;
11576         if (was_trunc) {
11577                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11578                 drp->trunc_len = htons(fullsz);
11579                 /*
11580                  * Len is already adjusted to size minus overhead above take
11581                  * out the pkt_drop chunk itself from it.
11582                  */
11583                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11584                 len = chk->send_size;
11585         } else {
11586                 /* no truncation needed */
11587                 drp->ch.chunk_flags = 0;
11588                 drp->trunc_len = htons(0);
11589         }
11590         if (bad_crc) {
11591                 drp->ch.chunk_flags |= SCTP_BADCRC;
11592         }
11593         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11594         SCTP_BUF_LEN(chk->data) = chk->send_size;
11595         chk->sent = SCTP_DATAGRAM_UNSENT;
11596         chk->snd_count = 0;
11597         if (net) {
11598                 /* we should hit here */
11599                 chk->whoTo = net;
11600                 atomic_add_int(&chk->whoTo->ref_count, 1);
11601         } else {
11602                 chk->whoTo = NULL;
11603         }
11604         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11605         drp->ch.chunk_length = htons(chk->send_size);
11606         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11607         if (spc < 0) {
11608                 spc = 0;
11609         }
11610         drp->bottle_bw = htonl(spc);
11611         if (asoc->my_rwnd) {
11612                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11613                     asoc->size_on_all_streams +
11614                     asoc->my_rwnd_control_len +
11615                     stcb->sctp_socket->so_rcv.sb_cc);
11616         } else {
11617                 /*-
11618                  * If my rwnd is 0, possibly from mbuf depletion as well as
11619                  * space used, tell the peer there is NO space aka onq == bw
11620                  */
11621                 drp->current_onq = htonl(spc);
11622         }
11623         drp->reserved = 0;
11624         datap = drp->data;
11625         m_copydata(m, iphlen, len, (caddr_t)datap);
11626         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11627         asoc->ctrl_queue_cnt++;
11628 }
11629
11630 void
11631 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11632 {
11633         struct sctp_association *asoc;
11634         struct sctp_cwr_chunk *cwr;
11635         struct sctp_tmit_chunk *chk;
11636
11637         SCTP_TCB_LOCK_ASSERT(stcb);
11638         if (net == NULL) {
11639                 return;
11640         }
11641         asoc = &stcb->asoc;
11642         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11643                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11644                         /*
11645                          * found a previous CWR queued to same destination
11646                          * update it if needed
11647                          */
11648                         uint32_t ctsn;
11649
11650                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11651                         ctsn = ntohl(cwr->tsn);
11652                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11653                                 cwr->tsn = htonl(high_tsn);
11654                         }
11655                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11656                                 /* Make sure override is carried */
11657                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11658                         }
11659                         return;
11660                 }
11661         }
11662         sctp_alloc_a_chunk(stcb, chk);
11663         if (chk == NULL) {
11664                 return;
11665         }
11666         chk->copy_by_ref = 0;
11667         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11668         chk->rec.chunk_id.can_take_data = 1;
11669         chk->flags = 0;
11670         chk->asoc = &stcb->asoc;
11671         chk->send_size = sizeof(struct sctp_cwr_chunk);
11672         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11673         if (chk->data == NULL) {
11674                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11675                 return;
11676         }
11677         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11678         SCTP_BUF_LEN(chk->data) = chk->send_size;
11679         chk->sent = SCTP_DATAGRAM_UNSENT;
11680         chk->snd_count = 0;
11681         chk->whoTo = net;
11682         atomic_add_int(&chk->whoTo->ref_count, 1);
11683         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11684         cwr->ch.chunk_type = SCTP_ECN_CWR;
11685         cwr->ch.chunk_flags = override;
11686         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11687         cwr->tsn = htonl(high_tsn);
11688         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11689         asoc->ctrl_queue_cnt++;
11690 }
11691
11692 static int
11693 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11694     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11695 {
11696         uint16_t len, old_len, i;
11697         struct sctp_stream_reset_out_request *req_out;
11698         struct sctp_chunkhdr *ch;
11699         int at;
11700         int number_entries = 0;
11701
11702         ch = mtod(chk->data, struct sctp_chunkhdr *);
11703         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11704         /* get to new offset for the param. */
11705         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11706         /* now how long will this param be? */
11707         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11708                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11709                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11710                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11711                         number_entries++;
11712                 }
11713         }
11714         if (number_entries == 0) {
11715                 return (0);
11716         }
11717         if (number_entries == stcb->asoc.streamoutcnt) {
11718                 number_entries = 0;
11719         }
11720         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11721                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11722         }
11723         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11724         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11725         req_out->ph.param_length = htons(len);
11726         req_out->request_seq = htonl(seq);
11727         req_out->response_seq = htonl(resp_seq);
11728         req_out->send_reset_at_tsn = htonl(last_sent);
11729         at = 0;
11730         if (number_entries) {
11731                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11732                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11733                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11734                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11735                                 req_out->list_of_streams[at] = htons(i);
11736                                 at++;
11737                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11738                                 if (at >= number_entries) {
11739                                         break;
11740                                 }
11741                         }
11742                 }
11743         } else {
11744                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11745                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11746                 }
11747         }
11748         if (SCTP_SIZE32(len) > len) {
11749                 /*-
11750                  * Need to worry about the pad we may end up adding to the
11751                  * end. This is easy since the struct is either aligned to 4
11752                  * bytes or 2 bytes off.
11753                  */
11754                 req_out->list_of_streams[number_entries] = 0;
11755         }
11756         /* now fix the chunk length */
11757         ch->chunk_length = htons(len + old_len);
11758         chk->book_size = len + old_len;
11759         chk->book_size_scale = 0;
11760         chk->send_size = SCTP_SIZE32(chk->book_size);
11761         SCTP_BUF_LEN(chk->data) = chk->send_size;
11762         return (1);
11763 }
11764
11765 static void
11766 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11767     int number_entries, uint16_t *list,
11768     uint32_t seq)
11769 {
11770         uint16_t len, old_len, i;
11771         struct sctp_stream_reset_in_request *req_in;
11772         struct sctp_chunkhdr *ch;
11773
11774         ch = mtod(chk->data, struct sctp_chunkhdr *);
11775         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11776
11777         /* get to new offset for the param. */
11778         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11779         /* now how long will this param be? */
11780         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11781         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11782         req_in->ph.param_length = htons(len);
11783         req_in->request_seq = htonl(seq);
11784         if (number_entries) {
11785                 for (i = 0; i < number_entries; i++) {
11786                         req_in->list_of_streams[i] = htons(list[i]);
11787                 }
11788         }
11789         if (SCTP_SIZE32(len) > len) {
11790                 /*-
11791                  * Need to worry about the pad we may end up adding to the
11792                  * end. This is easy since the struct is either aligned to 4
11793                  * bytes or 2 bytes off.
11794                  */
11795                 req_in->list_of_streams[number_entries] = 0;
11796         }
11797         /* now fix the chunk length */
11798         ch->chunk_length = htons(len + old_len);
11799         chk->book_size = len + old_len;
11800         chk->book_size_scale = 0;
11801         chk->send_size = SCTP_SIZE32(chk->book_size);
11802         SCTP_BUF_LEN(chk->data) = chk->send_size;
11803         return;
11804 }
11805
11806 static void
11807 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11808     uint32_t seq)
11809 {
11810         uint16_t len, old_len;
11811         struct sctp_stream_reset_tsn_request *req_tsn;
11812         struct sctp_chunkhdr *ch;
11813
11814         ch = mtod(chk->data, struct sctp_chunkhdr *);
11815         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11816
11817         /* get to new offset for the param. */
11818         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11819         /* now how long will this param be? */
11820         len = sizeof(struct sctp_stream_reset_tsn_request);
11821         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11822         req_tsn->ph.param_length = htons(len);
11823         req_tsn->request_seq = htonl(seq);
11824
11825         /* now fix the chunk length */
11826         ch->chunk_length = htons(len + old_len);
11827         chk->send_size = len + old_len;
11828         chk->book_size = SCTP_SIZE32(chk->send_size);
11829         chk->book_size_scale = 0;
11830         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11831         return;
11832 }
11833
11834 void
11835 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11836     uint32_t resp_seq, uint32_t result)
11837 {
11838         uint16_t len, old_len;
11839         struct sctp_stream_reset_response *resp;
11840         struct sctp_chunkhdr *ch;
11841
11842         ch = mtod(chk->data, struct sctp_chunkhdr *);
11843         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11844
11845         /* get to new offset for the param. */
11846         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11847         /* now how long will this param be? */
11848         len = sizeof(struct sctp_stream_reset_response);
11849         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11850         resp->ph.param_length = htons(len);
11851         resp->response_seq = htonl(resp_seq);
11852         resp->result = ntohl(result);
11853
11854         /* now fix the chunk length */
11855         ch->chunk_length = htons(len + old_len);
11856         chk->book_size = len + old_len;
11857         chk->book_size_scale = 0;
11858         chk->send_size = SCTP_SIZE32(chk->book_size);
11859         SCTP_BUF_LEN(chk->data) = chk->send_size;
11860         return;
11861 }
11862
11863 void
11864 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11865     struct sctp_stream_reset_list *ent,
11866     int response)
11867 {
11868         struct sctp_association *asoc;
11869         struct sctp_tmit_chunk *chk;
11870         struct sctp_chunkhdr *ch;
11871
11872         asoc = &stcb->asoc;
11873
11874         /*
11875          * Reset our last reset action to the new one IP -> response
11876          * (PERFORMED probably). This assures that if we fail to send, a
11877          * retran from the peer will get the new response.
11878          */
11879         asoc->last_reset_action[0] = response;
11880         if (asoc->stream_reset_outstanding) {
11881                 return;
11882         }
11883         sctp_alloc_a_chunk(stcb, chk);
11884         if (chk == NULL) {
11885                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11886                 return;
11887         }
11888         chk->copy_by_ref = 0;
11889         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11890         chk->rec.chunk_id.can_take_data = 0;
11891         chk->flags = 0;
11892         chk->asoc = &stcb->asoc;
11893         chk->book_size = sizeof(struct sctp_chunkhdr);
11894         chk->send_size = SCTP_SIZE32(chk->book_size);
11895         chk->book_size_scale = 0;
11896         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11897         if (chk->data == NULL) {
11898                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11899                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11900                 return;
11901         }
11902         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11903         /* setup chunk parameters */
11904         chk->sent = SCTP_DATAGRAM_UNSENT;
11905         chk->snd_count = 0;
11906         if (stcb->asoc.alternate) {
11907                 chk->whoTo = stcb->asoc.alternate;
11908         } else {
11909                 chk->whoTo = stcb->asoc.primary_destination;
11910         }
11911         ch = mtod(chk->data, struct sctp_chunkhdr *);
11912         ch->chunk_type = SCTP_STREAM_RESET;
11913         ch->chunk_flags = 0;
11914         ch->chunk_length = htons(chk->book_size);
11915         atomic_add_int(&chk->whoTo->ref_count, 1);
11916         SCTP_BUF_LEN(chk->data) = chk->send_size;
11917         sctp_add_stream_reset_result(chk, ent->seq, response);
11918         /* insert the chunk for sending */
11919         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11920             chk,
11921             sctp_next);
11922         asoc->ctrl_queue_cnt++;
11923 }
11924
11925 void
11926 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11927     uint32_t resp_seq, uint32_t result,
11928     uint32_t send_una, uint32_t recv_next)
11929 {
11930         uint16_t len, old_len;
11931         struct sctp_stream_reset_response_tsn *resp;
11932         struct sctp_chunkhdr *ch;
11933
11934         ch = mtod(chk->data, struct sctp_chunkhdr *);
11935         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11936
11937         /* get to new offset for the param. */
11938         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11939         /* now how long will this param be? */
11940         len = sizeof(struct sctp_stream_reset_response_tsn);
11941         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11942         resp->ph.param_length = htons(len);
11943         resp->response_seq = htonl(resp_seq);
11944         resp->result = htonl(result);
11945         resp->senders_next_tsn = htonl(send_una);
11946         resp->receivers_next_tsn = htonl(recv_next);
11947
11948         /* now fix the chunk length */
11949         ch->chunk_length = htons(len + old_len);
11950         chk->book_size = len + old_len;
11951         chk->send_size = SCTP_SIZE32(chk->book_size);
11952         chk->book_size_scale = 0;
11953         SCTP_BUF_LEN(chk->data) = chk->send_size;
11954         return;
11955 }
11956
11957 static void
11958 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11959     uint32_t seq,
11960     uint16_t adding)
11961 {
11962         uint16_t len, old_len;
11963         struct sctp_chunkhdr *ch;
11964         struct sctp_stream_reset_add_strm *addstr;
11965
11966         ch = mtod(chk->data, struct sctp_chunkhdr *);
11967         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11968
11969         /* get to new offset for the param. */
11970         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11971         /* now how long will this param be? */
11972         len = sizeof(struct sctp_stream_reset_add_strm);
11973
11974         /* Fill it out. */
11975         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11976         addstr->ph.param_length = htons(len);
11977         addstr->request_seq = htonl(seq);
11978         addstr->number_of_streams = htons(adding);
11979         addstr->reserved = 0;
11980
11981         /* now fix the chunk length */
11982         ch->chunk_length = htons(len + old_len);
11983         chk->send_size = len + old_len;
11984         chk->book_size = SCTP_SIZE32(chk->send_size);
11985         chk->book_size_scale = 0;
11986         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11987         return;
11988 }
11989
11990 static void
11991 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11992     uint32_t seq,
11993     uint16_t adding)
11994 {
11995         uint16_t len, old_len;
11996         struct sctp_chunkhdr *ch;
11997         struct sctp_stream_reset_add_strm *addstr;
11998
11999         ch = mtod(chk->data, struct sctp_chunkhdr *);
12000         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12001
12002         /* get to new offset for the param. */
12003         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12004         /* now how long will this param be? */
12005         len = sizeof(struct sctp_stream_reset_add_strm);
12006         /* Fill it out. */
12007         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12008         addstr->ph.param_length = htons(len);
12009         addstr->request_seq = htonl(seq);
12010         addstr->number_of_streams = htons(adding);
12011         addstr->reserved = 0;
12012
12013         /* now fix the chunk length */
12014         ch->chunk_length = htons(len + old_len);
12015         chk->send_size = len + old_len;
12016         chk->book_size = SCTP_SIZE32(chk->send_size);
12017         chk->book_size_scale = 0;
12018         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12019         return;
12020 }
12021
12022 int
12023 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12024 {
12025         struct sctp_association *asoc;
12026         struct sctp_tmit_chunk *chk;
12027         struct sctp_chunkhdr *ch;
12028         uint32_t seq;
12029
12030         asoc = &stcb->asoc;
12031         asoc->trigger_reset = 0;
12032         if (asoc->stream_reset_outstanding) {
12033                 return (EALREADY);
12034         }
12035         sctp_alloc_a_chunk(stcb, chk);
12036         if (chk == NULL) {
12037                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12038                 return (ENOMEM);
12039         }
12040         chk->copy_by_ref = 0;
12041         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12042         chk->rec.chunk_id.can_take_data = 0;
12043         chk->flags = 0;
12044         chk->asoc = &stcb->asoc;
12045         chk->book_size = sizeof(struct sctp_chunkhdr);
12046         chk->send_size = SCTP_SIZE32(chk->book_size);
12047         chk->book_size_scale = 0;
12048         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12049         if (chk->data == NULL) {
12050                 sctp_free_a_chunk(stcb, chk, so_locked);
12051                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12052                 return (ENOMEM);
12053         }
12054         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12055
12056         /* setup chunk parameters */
12057         chk->sent = SCTP_DATAGRAM_UNSENT;
12058         chk->snd_count = 0;
12059         if (stcb->asoc.alternate) {
12060                 chk->whoTo = stcb->asoc.alternate;
12061         } else {
12062                 chk->whoTo = stcb->asoc.primary_destination;
12063         }
12064         ch = mtod(chk->data, struct sctp_chunkhdr *);
12065         ch->chunk_type = SCTP_STREAM_RESET;
12066         ch->chunk_flags = 0;
12067         ch->chunk_length = htons(chk->book_size);
12068         atomic_add_int(&chk->whoTo->ref_count, 1);
12069         SCTP_BUF_LEN(chk->data) = chk->send_size;
12070         seq = stcb->asoc.str_reset_seq_out;
12071         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12072                 seq++;
12073                 asoc->stream_reset_outstanding++;
12074         } else {
12075                 m_freem(chk->data);
12076                 chk->data = NULL;
12077                 sctp_free_a_chunk(stcb, chk, so_locked);
12078                 return (ENOENT);
12079         }
12080         asoc->str_reset = chk;
12081         /* insert the chunk for sending */
12082         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12083             chk,
12084             sctp_next);
12085         asoc->ctrl_queue_cnt++;
12086
12087         if (stcb->asoc.send_sack) {
12088                 sctp_send_sack(stcb, so_locked);
12089         }
12090         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12091         return (0);
12092 }
12093
12094 int
12095 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12096     uint16_t number_entries, uint16_t *list,
12097     uint8_t send_in_req,
12098     uint8_t send_tsn_req,
12099     uint8_t add_stream,
12100     uint16_t adding_o,
12101     uint16_t adding_i, uint8_t peer_asked)
12102 {
12103         struct sctp_association *asoc;
12104         struct sctp_tmit_chunk *chk;
12105         struct sctp_chunkhdr *ch;
12106         int can_send_out_req = 0;
12107         uint32_t seq;
12108
12109         asoc = &stcb->asoc;
12110         if (asoc->stream_reset_outstanding) {
12111                 /*-
12112                  * Already one pending, must get ACK back to clear the flag.
12113                  */
12114                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12115                 return (EBUSY);
12116         }
12117         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12118             (add_stream == 0)) {
12119                 /* nothing to do */
12120                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12121                 return (EINVAL);
12122         }
12123         if (send_tsn_req && send_in_req) {
12124                 /* error, can't do that */
12125                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12126                 return (EINVAL);
12127         } else if (send_in_req) {
12128                 can_send_out_req = 1;
12129         }
12130         if (number_entries > (MCLBYTES -
12131             SCTP_MIN_OVERHEAD -
12132             sizeof(struct sctp_chunkhdr) -
12133             sizeof(struct sctp_stream_reset_out_request)) /
12134             sizeof(uint16_t)) {
12135                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12136                 return (ENOMEM);
12137         }
12138         sctp_alloc_a_chunk(stcb, chk);
12139         if (chk == NULL) {
12140                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12141                 return (ENOMEM);
12142         }
12143         chk->copy_by_ref = 0;
12144         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12145         chk->rec.chunk_id.can_take_data = 0;
12146         chk->flags = 0;
12147         chk->asoc = &stcb->asoc;
12148         chk->book_size = sizeof(struct sctp_chunkhdr);
12149         chk->send_size = SCTP_SIZE32(chk->book_size);
12150         chk->book_size_scale = 0;
12151         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12152         if (chk->data == NULL) {
12153                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12154                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12155                 return (ENOMEM);
12156         }
12157         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12158
12159         /* setup chunk parameters */
12160         chk->sent = SCTP_DATAGRAM_UNSENT;
12161         chk->snd_count = 0;
12162         if (stcb->asoc.alternate) {
12163                 chk->whoTo = stcb->asoc.alternate;
12164         } else {
12165                 chk->whoTo = stcb->asoc.primary_destination;
12166         }
12167         atomic_add_int(&chk->whoTo->ref_count, 1);
12168         ch = mtod(chk->data, struct sctp_chunkhdr *);
12169         ch->chunk_type = SCTP_STREAM_RESET;
12170         ch->chunk_flags = 0;
12171         ch->chunk_length = htons(chk->book_size);
12172         SCTP_BUF_LEN(chk->data) = chk->send_size;
12173
12174         seq = stcb->asoc.str_reset_seq_out;
12175         if (can_send_out_req) {
12176                 int ret;
12177
12178                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12179                 if (ret) {
12180                         seq++;
12181                         asoc->stream_reset_outstanding++;
12182                 }
12183         }
12184         if ((add_stream & 1) &&
12185             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12186                 /* Need to allocate more */
12187                 struct sctp_stream_out *oldstream;
12188                 struct sctp_stream_queue_pending *sp, *nsp;
12189                 int i;
12190 #if defined(SCTP_DETAILED_STR_STATS)
12191                 int j;
12192 #endif
12193
12194                 oldstream = stcb->asoc.strmout;
12195                 /* get some more */
12196                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12197                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12198                     SCTP_M_STRMO);
12199                 if (stcb->asoc.strmout == NULL) {
12200                         uint8_t x;
12201
12202                         stcb->asoc.strmout = oldstream;
12203                         /* Turn off the bit */
12204                         x = add_stream & 0xfe;
12205                         add_stream = x;
12206                         goto skip_stuff;
12207                 }
12208                 /*
12209                  * Ok now we proceed with copying the old out stuff and
12210                  * initializing the new stuff.
12211                  */
12212                 SCTP_TCB_SEND_LOCK(stcb);
12213                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12214                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12215                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12216                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12217                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12218                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12219                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12220                         stcb->asoc.strmout[i].sid = i;
12221                         stcb->asoc.strmout[i].state = oldstream[i].state;
12222                         /* FIX ME FIX ME */
12223                         /*
12224                          * This should be a SS_COPY operation FIX ME STREAM
12225                          * SCHEDULER EXPERT
12226                          */
12227                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12228                         /* now anything on those queues? */
12229                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12230                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12231                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12232                         }
12233
12234                 }
12235                 /* now the new streams */
12236                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12237                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12238                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12239                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12240 #if defined(SCTP_DETAILED_STR_STATS)
12241                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12242                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12243                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12244                         }
12245 #else
12246                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12247                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12248 #endif
12249                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12250                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12251                         stcb->asoc.strmout[i].sid = i;
12252                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12253                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12254                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12255                 }
12256                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12257                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12258                 SCTP_TCB_SEND_UNLOCK(stcb);
12259         }
12260 skip_stuff:
12261         if ((add_stream & 1) && (adding_o > 0)) {
12262                 asoc->strm_pending_add_size = adding_o;
12263                 asoc->peer_req_out = peer_asked;
12264                 sctp_add_an_out_stream(chk, seq, adding_o);
12265                 seq++;
12266                 asoc->stream_reset_outstanding++;
12267         }
12268         if ((add_stream & 2) && (adding_i > 0)) {
12269                 sctp_add_an_in_stream(chk, seq, adding_i);
12270                 seq++;
12271                 asoc->stream_reset_outstanding++;
12272         }
12273         if (send_in_req) {
12274                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12275                 seq++;
12276                 asoc->stream_reset_outstanding++;
12277         }
12278         if (send_tsn_req) {
12279                 sctp_add_stream_reset_tsn(chk, seq);
12280                 asoc->stream_reset_outstanding++;
12281         }
12282         asoc->str_reset = chk;
12283         /* insert the chunk for sending */
12284         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12285             chk,
12286             sctp_next);
12287         asoc->ctrl_queue_cnt++;
12288         if (stcb->asoc.send_sack) {
12289                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12290         }
12291         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12292         return (0);
12293 }
12294
12295 void
12296 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12297     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12298     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12299     uint32_t vrf_id, uint16_t port)
12300 {
12301         /* Don't respond to an ABORT with an ABORT. */
12302         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12303                 if (cause)
12304                         sctp_m_freem(cause);
12305                 return;
12306         }
12307         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12308             mflowtype, mflowid, fibnum,
12309             vrf_id, port);
12310         return;
12311 }
12312
12313 void
12314 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12315     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12316     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12317     uint32_t vrf_id, uint16_t port)
12318 {
12319         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12320             mflowtype, mflowid, fibnum,
12321             vrf_id, port);
12322         return;
12323 }
12324
12325 static struct mbuf *
12326 sctp_copy_resume(struct uio *uio,
12327     int max_send_len,
12328     int user_marks_eor,
12329     int *error,
12330     uint32_t *sndout,
12331     struct mbuf **new_tail)
12332 {
12333         struct mbuf *m;
12334
12335         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12336             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12337         if (m == NULL) {
12338                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12339                 *error = ENOBUFS;
12340         } else {
12341                 *sndout = m_length(m, NULL);
12342                 *new_tail = m_last(m);
12343         }
12344         return (m);
12345 }
12346
12347 static int
12348 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12349     struct uio *uio,
12350     int resv_upfront)
12351 {
12352         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12353             resv_upfront, 0);
12354         if (sp->data == NULL) {
12355                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12356                 return (ENOBUFS);
12357         }
12358
12359         sp->tail_mbuf = m_last(sp->data);
12360         return (0);
12361 }
12362
12363
12364
12365 static struct sctp_stream_queue_pending *
12366 sctp_copy_it_in(struct sctp_tcb *stcb,
12367     struct sctp_association *asoc,
12368     struct sctp_sndrcvinfo *srcv,
12369     struct uio *uio,
12370     struct sctp_nets *net,
12371     int max_send_len,
12372     int user_marks_eor,
12373     int *error)
12374 {
12375
12376         /*-
12377          * This routine must be very careful in its work. Protocol
12378          * processing is up and running so care must be taken to spl...()
12379          * when you need to do something that may effect the stcb/asoc. The
12380          * sb is locked however. When data is copied the protocol processing
12381          * should be enabled since this is a slower operation...
12382          */
12383         struct sctp_stream_queue_pending *sp = NULL;
12384         int resv_in_first;
12385
12386         *error = 0;
12387         /* Now can we send this? */
12388         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12389             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12390             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12391             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12392                 /* got data while shutting down */
12393                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12394                 *error = ECONNRESET;
12395                 goto out_now;
12396         }
12397         sctp_alloc_a_strmoq(stcb, sp);
12398         if (sp == NULL) {
12399                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12400                 *error = ENOMEM;
12401                 goto out_now;
12402         }
12403         sp->act_flags = 0;
12404         sp->sender_all_done = 0;
12405         sp->sinfo_flags = srcv->sinfo_flags;
12406         sp->timetolive = srcv->sinfo_timetolive;
12407         sp->ppid = srcv->sinfo_ppid;
12408         sp->context = srcv->sinfo_context;
12409         sp->fsn = 0;
12410         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12411
12412         sp->sid = srcv->sinfo_stream;
12413         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12414         if ((sp->length == (uint32_t)uio->uio_resid) &&
12415             ((user_marks_eor == 0) ||
12416             (srcv->sinfo_flags & SCTP_EOF) ||
12417             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12418                 sp->msg_is_complete = 1;
12419         } else {
12420                 sp->msg_is_complete = 0;
12421         }
12422         sp->sender_all_done = 0;
12423         sp->some_taken = 0;
12424         sp->put_last_out = 0;
12425         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12426         sp->data = sp->tail_mbuf = NULL;
12427         if (sp->length == 0) {
12428                 goto skip_copy;
12429         }
12430         if (srcv->sinfo_keynumber_valid) {
12431                 sp->auth_keyid = srcv->sinfo_keynumber;
12432         } else {
12433                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12434         }
12435         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12436                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12437                 sp->holds_key_ref = 1;
12438         }
12439         *error = sctp_copy_one(sp, uio, resv_in_first);
12440 skip_copy:
12441         if (*error) {
12442                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12443                 sp = NULL;
12444         } else {
12445                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12446                         sp->net = net;
12447                         atomic_add_int(&sp->net->ref_count, 1);
12448                 } else {
12449                         sp->net = NULL;
12450                 }
12451                 sctp_set_prsctp_policy(sp);
12452         }
12453 out_now:
12454         return (sp);
12455 }
12456
12457
12458 int
12459 sctp_sosend(struct socket *so,
12460     struct sockaddr *addr,
12461     struct uio *uio,
12462     struct mbuf *top,
12463     struct mbuf *control,
12464     int flags,
12465     struct thread *p
12466 )
12467 {
12468         int error, use_sndinfo = 0;
12469         struct sctp_sndrcvinfo sndrcvninfo;
12470         struct sockaddr *addr_to_use;
12471 #if defined(INET) && defined(INET6)
12472         struct sockaddr_in sin;
12473 #endif
12474
12475         if (control) {
12476                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12477                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12478                     sizeof(sndrcvninfo))) {
12479                         /* got one */
12480                         use_sndinfo = 1;
12481                 }
12482         }
12483         addr_to_use = addr;
12484 #if defined(INET) && defined(INET6)
12485         if ((addr) && (addr->sa_family == AF_INET6)) {
12486                 struct sockaddr_in6 *sin6;
12487
12488                 sin6 = (struct sockaddr_in6 *)addr;
12489                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12490                         in6_sin6_2_sin(&sin, sin6);
12491                         addr_to_use = (struct sockaddr *)&sin;
12492                 }
12493         }
12494 #endif
12495         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12496             control,
12497             flags,
12498             use_sndinfo ? &sndrcvninfo : NULL
12499             ,p
12500             );
12501         return (error);
12502 }
12503
12504
12505 int
12506 sctp_lower_sosend(struct socket *so,
12507     struct sockaddr *addr,
12508     struct uio *uio,
12509     struct mbuf *i_pak,
12510     struct mbuf *control,
12511     int flags,
12512     struct sctp_sndrcvinfo *srcv
12513     ,
12514     struct thread *p
12515 )
12516 {
12517         unsigned int sndlen = 0, max_len;
12518         int error, len;
12519         struct mbuf *top = NULL;
12520         int queue_only = 0, queue_only_for_init = 0;
12521         int free_cnt_applied = 0;
12522         int un_sent;
12523         int now_filled = 0;
12524         unsigned int inqueue_bytes = 0;
12525         struct sctp_block_entry be;
12526         struct sctp_inpcb *inp;
12527         struct sctp_tcb *stcb = NULL;
12528         struct timeval now;
12529         struct sctp_nets *net;
12530         struct sctp_association *asoc;
12531         struct sctp_inpcb *t_inp;
12532         int user_marks_eor;
12533         int create_lock_applied = 0;
12534         int nagle_applies = 0;
12535         int some_on_control = 0;
12536         int got_all_of_the_send = 0;
12537         int hold_tcblock = 0;
12538         int non_blocking = 0;
12539         uint32_t local_add_more, local_soresv = 0;
12540         uint16_t port;
12541         uint16_t sinfo_flags;
12542         sctp_assoc_t sinfo_assoc_id;
12543
12544         error = 0;
12545         net = NULL;
12546         stcb = NULL;
12547         asoc = NULL;
12548
12549         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12550         if (inp == NULL) {
12551                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12552                 error = EINVAL;
12553                 if (i_pak) {
12554                         SCTP_RELEASE_PKT(i_pak);
12555                 }
12556                 return (error);
12557         }
12558         if ((uio == NULL) && (i_pak == NULL)) {
12559                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12560                 return (EINVAL);
12561         }
12562         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12563         atomic_add_int(&inp->total_sends, 1);
12564         if (uio) {
12565                 if (uio->uio_resid < 0) {
12566                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12567                         return (EINVAL);
12568                 }
12569                 sndlen = (unsigned int)uio->uio_resid;
12570         } else {
12571                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12572                 sndlen = SCTP_HEADER_LEN(i_pak);
12573         }
12574         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12575             (void *)addr,
12576             sndlen);
12577         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12578             SCTP_IS_LISTENING(inp)) {
12579                 /* The listener can NOT send */
12580                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12581                 error = ENOTCONN;
12582                 goto out_unlocked;
12583         }
12584         /**
12585          * Pre-screen address, if one is given the sin-len
12586          * must be set correctly!
12587          */
12588         if (addr) {
12589                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12590
12591                 switch (raddr->sa.sa_family) {
12592 #ifdef INET
12593                 case AF_INET:
12594                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12595                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                                 error = EINVAL;
12597                                 goto out_unlocked;
12598                         }
12599                         port = raddr->sin.sin_port;
12600                         break;
12601 #endif
12602 #ifdef INET6
12603                 case AF_INET6:
12604                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12605                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                                 error = EINVAL;
12607                                 goto out_unlocked;
12608                         }
12609                         port = raddr->sin6.sin6_port;
12610                         break;
12611 #endif
12612                 default:
12613                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12614                         error = EAFNOSUPPORT;
12615                         goto out_unlocked;
12616                 }
12617         } else
12618                 port = 0;
12619
12620         if (srcv) {
12621                 sinfo_flags = srcv->sinfo_flags;
12622                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12623                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12624                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12625                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12626                         error = EINVAL;
12627                         goto out_unlocked;
12628                 }
12629                 if (srcv->sinfo_flags)
12630                         SCTP_STAT_INCR(sctps_sends_with_flags);
12631         } else {
12632                 sinfo_flags = inp->def_send.sinfo_flags;
12633                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12634         }
12635         if (sinfo_flags & SCTP_SENDALL) {
12636                 /* its a sendall */
12637                 error = sctp_sendall(inp, uio, top, srcv);
12638                 top = NULL;
12639                 goto out_unlocked;
12640         }
12641         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12642                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12643                 error = EINVAL;
12644                 goto out_unlocked;
12645         }
12646         /* now we must find the assoc */
12647         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12648             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12649                 SCTP_INP_RLOCK(inp);
12650                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12651                 if (stcb) {
12652                         SCTP_TCB_LOCK(stcb);
12653                         hold_tcblock = 1;
12654                 }
12655                 SCTP_INP_RUNLOCK(inp);
12656         } else if (sinfo_assoc_id) {
12657                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12658                 if (stcb != NULL) {
12659                         hold_tcblock = 1;
12660                 }
12661         } else if (addr) {
12662                 /*-
12663                  * Since we did not use findep we must
12664                  * increment it, and if we don't find a tcb
12665                  * decrement it.
12666                  */
12667                 SCTP_INP_WLOCK(inp);
12668                 SCTP_INP_INCR_REF(inp);
12669                 SCTP_INP_WUNLOCK(inp);
12670                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12671                 if (stcb == NULL) {
12672                         SCTP_INP_WLOCK(inp);
12673                         SCTP_INP_DECR_REF(inp);
12674                         SCTP_INP_WUNLOCK(inp);
12675                 } else {
12676                         hold_tcblock = 1;
12677                 }
12678         }
12679         if ((stcb == NULL) && (addr)) {
12680                 /* Possible implicit send? */
12681                 SCTP_ASOC_CREATE_LOCK(inp);
12682                 create_lock_applied = 1;
12683                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12684                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12685                         /* Should I really unlock ? */
12686                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12687                         error = EINVAL;
12688                         goto out_unlocked;
12689
12690                 }
12691                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12692                     (addr->sa_family == AF_INET6)) {
12693                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12694                         error = EINVAL;
12695                         goto out_unlocked;
12696                 }
12697                 SCTP_INP_WLOCK(inp);
12698                 SCTP_INP_INCR_REF(inp);
12699                 SCTP_INP_WUNLOCK(inp);
12700                 /* With the lock applied look again */
12701                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12702                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12703                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12704                 }
12705                 if (stcb == NULL) {
12706                         SCTP_INP_WLOCK(inp);
12707                         SCTP_INP_DECR_REF(inp);
12708                         SCTP_INP_WUNLOCK(inp);
12709                 } else {
12710                         hold_tcblock = 1;
12711                 }
12712                 if (error) {
12713                         goto out_unlocked;
12714                 }
12715                 if (t_inp != inp) {
12716                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12717                         error = ENOTCONN;
12718                         goto out_unlocked;
12719                 }
12720         }
12721         if (stcb == NULL) {
12722                 if (addr == NULL) {
12723                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12724                         error = ENOENT;
12725                         goto out_unlocked;
12726                 } else {
12727                         /* We must go ahead and start the INIT process */
12728                         uint32_t vrf_id;
12729
12730                         if ((sinfo_flags & SCTP_ABORT) ||
12731                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12732                                 /*-
12733                                  * User asks to abort a non-existant assoc,
12734                                  * or EOF a non-existant assoc with no data
12735                                  */
12736                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12737                                 error = ENOENT;
12738                                 goto out_unlocked;
12739                         }
12740                         /* get an asoc/stcb struct */
12741                         vrf_id = inp->def_vrf_id;
12742 #ifdef INVARIANTS
12743                         if (create_lock_applied == 0) {
12744                                 panic("Error, should hold create lock and I don't?");
12745                         }
12746 #endif
12747                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12748                             inp->sctp_ep.pre_open_stream_count,
12749                             inp->sctp_ep.port,
12750                             p);
12751                         if (stcb == NULL) {
12752                                 /* Error is setup for us in the call */
12753                                 goto out_unlocked;
12754                         }
12755                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12756                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12757                                 /*
12758                                  * Set the connected flag so we can queue
12759                                  * data
12760                                  */
12761                                 soisconnecting(so);
12762                         }
12763                         hold_tcblock = 1;
12764                         if (create_lock_applied) {
12765                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12766                                 create_lock_applied = 0;
12767                         } else {
12768                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12769                         }
12770                         /*
12771                          * Turn on queue only flag to prevent data from
12772                          * being sent
12773                          */
12774                         queue_only = 1;
12775                         asoc = &stcb->asoc;
12776                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12777                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12778
12779                         /* initialize authentication params for the assoc */
12780                         sctp_initialize_auth_params(inp, stcb);
12781
12782                         if (control) {
12783                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12784                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12785                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12786                                         hold_tcblock = 0;
12787                                         stcb = NULL;
12788                                         goto out_unlocked;
12789                                 }
12790                         }
12791                         /* out with the INIT */
12792                         queue_only_for_init = 1;
12793                         /*-
12794                          * we may want to dig in after this call and adjust the MTU
12795                          * value. It defaulted to 1500 (constant) but the ro
12796                          * structure may now have an update and thus we may need to
12797                          * change it BEFORE we append the message.
12798                          */
12799                 }
12800         } else
12801                 asoc = &stcb->asoc;
12802         if (srcv == NULL)
12803                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12804         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12805                 if (addr)
12806                         net = sctp_findnet(stcb, addr);
12807                 else
12808                         net = NULL;
12809                 if ((net == NULL) ||
12810                     ((port != 0) && (port != stcb->rport))) {
12811                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12812                         error = EINVAL;
12813                         goto out_unlocked;
12814                 }
12815         } else {
12816                 if (stcb->asoc.alternate) {
12817                         net = stcb->asoc.alternate;
12818                 } else {
12819                         net = stcb->asoc.primary_destination;
12820                 }
12821         }
12822         atomic_add_int(&stcb->total_sends, 1);
12823         /* Keep the stcb from being freed under our feet */
12824         atomic_add_int(&asoc->refcnt, 1);
12825         free_cnt_applied = 1;
12826
12827         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12828                 if (sndlen > asoc->smallest_mtu) {
12829                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12830                         error = EMSGSIZE;
12831                         goto out_unlocked;
12832                 }
12833         }
12834         if (SCTP_SO_IS_NBIO(so)
12835             || (flags & MSG_NBIO)
12836             ) {
12837                 non_blocking = 1;
12838         }
12839         /* would we block? */
12840         if (non_blocking) {
12841                 uint32_t amount;
12842
12843                 if (hold_tcblock == 0) {
12844                         SCTP_TCB_LOCK(stcb);
12845                         hold_tcblock = 1;
12846                 }
12847                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12848                 if (user_marks_eor == 0) {
12849                         amount = sndlen;
12850                 } else {
12851                         amount = 1;
12852                 }
12853                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12854                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12855                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12856                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12857                                 error = EMSGSIZE;
12858                         else
12859                                 error = EWOULDBLOCK;
12860                         goto out_unlocked;
12861                 }
12862                 stcb->asoc.sb_send_resv += sndlen;
12863                 SCTP_TCB_UNLOCK(stcb);
12864                 hold_tcblock = 0;
12865         } else {
12866                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12867         }
12868         local_soresv = sndlen;
12869         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12870                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12871                 error = ECONNRESET;
12872                 goto out_unlocked;
12873         }
12874         if (create_lock_applied) {
12875                 SCTP_ASOC_CREATE_UNLOCK(inp);
12876                 create_lock_applied = 0;
12877         }
12878         /* Is the stream no. valid? */
12879         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12880                 /* Invalid stream number */
12881                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12882                 error = EINVAL;
12883                 goto out_unlocked;
12884         }
12885         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12886             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12887                 /*
12888                  * Can't queue any data while stream reset is underway.
12889                  */
12890                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12891                         error = EAGAIN;
12892                 } else {
12893                         error = EINVAL;
12894                 }
12895                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12896                 goto out_unlocked;
12897         }
12898         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12899             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12900                 queue_only = 1;
12901         }
12902         /* we are now done with all control */
12903         if (control) {
12904                 sctp_m_freem(control);
12905                 control = NULL;
12906         }
12907         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12908             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12909             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12910             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12911                 if (srcv->sinfo_flags & SCTP_ABORT) {
12912                         ;
12913                 } else {
12914                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12915                         error = ECONNRESET;
12916                         goto out_unlocked;
12917                 }
12918         }
12919         /* Ok, we will attempt a msgsnd :> */
12920         if (p) {
12921                 p->td_ru.ru_msgsnd++;
12922         }
12923         /* Are we aborting? */
12924         if (srcv->sinfo_flags & SCTP_ABORT) {
12925                 struct mbuf *mm;
12926                 int tot_demand, tot_out = 0, max_out;
12927
12928                 SCTP_STAT_INCR(sctps_sends_with_abort);
12929                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12930                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12931                         /* It has to be up before we abort */
12932                         /* how big is the user initiated abort? */
12933                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12934                         error = EINVAL;
12935                         goto out;
12936                 }
12937                 if (hold_tcblock) {
12938                         SCTP_TCB_UNLOCK(stcb);
12939                         hold_tcblock = 0;
12940                 }
12941                 if (top) {
12942                         struct mbuf *cntm = NULL;
12943
12944                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12945                         if (sndlen != 0) {
12946                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12947                                         tot_out += SCTP_BUF_LEN(cntm);
12948                                 }
12949                         }
12950                 } else {
12951                         /* Must fit in a MTU */
12952                         tot_out = sndlen;
12953                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12954                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12955                                 /* To big */
12956                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12957                                 error = EMSGSIZE;
12958                                 goto out;
12959                         }
12960                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12961                 }
12962                 if (mm == NULL) {
12963                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12964                         error = ENOMEM;
12965                         goto out;
12966                 }
12967                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12968                 max_out -= sizeof(struct sctp_abort_msg);
12969                 if (tot_out > max_out) {
12970                         tot_out = max_out;
12971                 }
12972                 if (mm) {
12973                         struct sctp_paramhdr *ph;
12974
12975                         /* now move forward the data pointer */
12976                         ph = mtod(mm, struct sctp_paramhdr *);
12977                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12978                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12979                         ph++;
12980                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12981                         if (top == NULL) {
12982                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12983                                 if (error) {
12984                                         /*-
12985                                          * Here if we can't get his data we
12986                                          * still abort we just don't get to
12987                                          * send the users note :-0
12988                                          */
12989                                         sctp_m_freem(mm);
12990                                         mm = NULL;
12991                                 }
12992                         } else {
12993                                 if (sndlen != 0) {
12994                                         SCTP_BUF_NEXT(mm) = top;
12995                                 }
12996                         }
12997                 }
12998                 if (hold_tcblock == 0) {
12999                         SCTP_TCB_LOCK(stcb);
13000                 }
13001                 atomic_add_int(&stcb->asoc.refcnt, -1);
13002                 free_cnt_applied = 0;
13003                 /* release this lock, otherwise we hang on ourselves */
13004                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13005                 /* now relock the stcb so everything is sane */
13006                 hold_tcblock = 0;
13007                 stcb = NULL;
13008                 /*
13009                  * In this case top is already chained to mm avoid double
13010                  * free, since we free it below if top != NULL and driver
13011                  * would free it after sending the packet out
13012                  */
13013                 if (sndlen != 0) {
13014                         top = NULL;
13015                 }
13016                 goto out_unlocked;
13017         }
13018         /* Calculate the maximum we can send */
13019         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13020         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13021                 if (non_blocking) {
13022                         /* we already checked for non-blocking above. */
13023                         max_len = sndlen;
13024                 } else {
13025                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13026                 }
13027         } else {
13028                 max_len = 0;
13029         }
13030         if (hold_tcblock) {
13031                 SCTP_TCB_UNLOCK(stcb);
13032                 hold_tcblock = 0;
13033         }
13034         if (asoc->strmout == NULL) {
13035                 /* huh? software error */
13036                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13037                 error = EFAULT;
13038                 goto out_unlocked;
13039         }
13040
13041         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13042         if ((user_marks_eor == 0) &&
13043             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13044                 /* It will NEVER fit */
13045                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13046                 error = EMSGSIZE;
13047                 goto out_unlocked;
13048         }
13049         if ((uio == NULL) && user_marks_eor) {
13050                 /*-
13051                  * We do not support eeor mode for
13052                  * sending with mbuf chains (like sendfile).
13053                  */
13054                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13055                 error = EINVAL;
13056                 goto out_unlocked;
13057         }
13058
13059         if (user_marks_eor) {
13060                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13061         } else {
13062                 /*-
13063                  * For non-eeor the whole message must fit in
13064                  * the socket send buffer.
13065                  */
13066                 local_add_more = sndlen;
13067         }
13068         len = 0;
13069         if (non_blocking) {
13070                 goto skip_preblock;
13071         }
13072         if (((max_len <= local_add_more) &&
13073             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13074             (max_len == 0) ||
13075             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13076                 /* No room right now ! */
13077                 SOCKBUF_LOCK(&so->so_snd);
13078                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13079                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13080                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13081                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13082                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13083                             inqueue_bytes,
13084                             local_add_more,
13085                             stcb->asoc.stream_queue_cnt,
13086                             stcb->asoc.chunks_on_out_queue,
13087                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13088                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13089                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13090                         }
13091                         be.error = 0;
13092                         stcb->block_entry = &be;
13093                         error = sbwait(&so->so_snd);
13094                         stcb->block_entry = NULL;
13095                         if (error || so->so_error || be.error) {
13096                                 if (error == 0) {
13097                                         if (so->so_error)
13098                                                 error = so->so_error;
13099                                         if (be.error) {
13100                                                 error = be.error;
13101                                         }
13102                                 }
13103                                 SOCKBUF_UNLOCK(&so->so_snd);
13104                                 goto out_unlocked;
13105                         }
13106                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13107                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13108                                     asoc, stcb->asoc.total_output_queue_size);
13109                         }
13110                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13111                                 SOCKBUF_UNLOCK(&so->so_snd);
13112                                 goto out_unlocked;
13113                         }
13114                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13115                 }
13116                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13117                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13118                 } else {
13119                         max_len = 0;
13120                 }
13121                 SOCKBUF_UNLOCK(&so->so_snd);
13122         }
13123
13124 skip_preblock:
13125         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13126                 goto out_unlocked;
13127         }
13128         /*
13129          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13130          * case NOTE: uio will be null when top/mbuf is passed
13131          */
13132         if (sndlen == 0) {
13133                 if (srcv->sinfo_flags & SCTP_EOF) {
13134                         got_all_of_the_send = 1;
13135                         goto dataless_eof;
13136                 } else {
13137                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13138                         error = EINVAL;
13139                         goto out;
13140                 }
13141         }
13142         if (top == NULL) {
13143                 struct sctp_stream_queue_pending *sp;
13144                 struct sctp_stream_out *strm;
13145                 uint32_t sndout;
13146
13147                 SCTP_TCB_SEND_LOCK(stcb);
13148                 if ((asoc->stream_locked) &&
13149                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13150                         SCTP_TCB_SEND_UNLOCK(stcb);
13151                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13152                         error = EINVAL;
13153                         goto out;
13154                 }
13155                 SCTP_TCB_SEND_UNLOCK(stcb);
13156
13157                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13158                 if (strm->last_msg_incomplete == 0) {
13159         do_a_copy_in:
13160                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13161                         if (error) {
13162                                 goto out;
13163                         }
13164                         SCTP_TCB_SEND_LOCK(stcb);
13165                         if (sp->msg_is_complete) {
13166                                 strm->last_msg_incomplete = 0;
13167                                 asoc->stream_locked = 0;
13168                         } else {
13169                                 /*
13170                                  * Just got locked to this guy in case of an
13171                                  * interrupt.
13172                                  */
13173                                 strm->last_msg_incomplete = 1;
13174                                 if (stcb->asoc.idata_supported == 0) {
13175                                         asoc->stream_locked = 1;
13176                                         asoc->stream_locked_on = srcv->sinfo_stream;
13177                                 }
13178                                 sp->sender_all_done = 0;
13179                         }
13180                         sctp_snd_sb_alloc(stcb, sp->length);
13181                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13182                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13183                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13184                         }
13185                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13186                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13187                         SCTP_TCB_SEND_UNLOCK(stcb);
13188                 } else {
13189                         SCTP_TCB_SEND_LOCK(stcb);
13190                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13191                         SCTP_TCB_SEND_UNLOCK(stcb);
13192                         if (sp == NULL) {
13193                                 /* ???? Huh ??? last msg is gone */
13194 #ifdef INVARIANTS
13195                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13196 #else
13197                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13198                                 strm->last_msg_incomplete = 0;
13199 #endif
13200                                 goto do_a_copy_in;
13201
13202                         }
13203                 }
13204                 while (uio->uio_resid > 0) {
13205                         /* How much room do we have? */
13206                         struct mbuf *new_tail, *mm;
13207
13208                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13209                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13210                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13211                         else
13212                                 max_len = 0;
13213
13214                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13215                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13216                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13217                                 sndout = 0;
13218                                 new_tail = NULL;
13219                                 if (hold_tcblock) {
13220                                         SCTP_TCB_UNLOCK(stcb);
13221                                         hold_tcblock = 0;
13222                                 }
13223                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13224                                 if ((mm == NULL) || error) {
13225                                         if (mm) {
13226                                                 sctp_m_freem(mm);
13227                                         }
13228                                         goto out;
13229                                 }
13230                                 /* Update the mbuf and count */
13231                                 SCTP_TCB_SEND_LOCK(stcb);
13232                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13233                                         /*
13234                                          * we need to get out. Peer probably
13235                                          * aborted.
13236                                          */
13237                                         sctp_m_freem(mm);
13238                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13239                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13240                                                 error = ECONNRESET;
13241                                         }
13242                                         SCTP_TCB_SEND_UNLOCK(stcb);
13243                                         goto out;
13244                                 }
13245                                 if (sp->tail_mbuf) {
13246                                         /* tack it to the end */
13247                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13248                                         sp->tail_mbuf = new_tail;
13249                                 } else {
13250                                         /* A stolen mbuf */
13251                                         sp->data = mm;
13252                                         sp->tail_mbuf = new_tail;
13253                                 }
13254                                 sctp_snd_sb_alloc(stcb, sndout);
13255                                 atomic_add_int(&sp->length, sndout);
13256                                 len += sndout;
13257                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13258                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13259                                 }
13260
13261                                 /* Did we reach EOR? */
13262                                 if ((uio->uio_resid == 0) &&
13263                                     ((user_marks_eor == 0) ||
13264                                     (srcv->sinfo_flags & SCTP_EOF) ||
13265                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13266                                         sp->msg_is_complete = 1;
13267                                 } else {
13268                                         sp->msg_is_complete = 0;
13269                                 }
13270                                 SCTP_TCB_SEND_UNLOCK(stcb);
13271                         }
13272                         if (uio->uio_resid == 0) {
13273                                 /* got it all? */
13274                                 continue;
13275                         }
13276                         /* PR-SCTP? */
13277                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13278                                 /*
13279                                  * This is ugly but we must assure locking
13280                                  * order
13281                                  */
13282                                 if (hold_tcblock == 0) {
13283                                         SCTP_TCB_LOCK(stcb);
13284                                         hold_tcblock = 1;
13285                                 }
13286                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13287                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13288                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13289                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13290                                 else
13291                                         max_len = 0;
13292                                 if (max_len > 0) {
13293                                         continue;
13294                                 }
13295                                 SCTP_TCB_UNLOCK(stcb);
13296                                 hold_tcblock = 0;
13297                         }
13298                         /* wait for space now */
13299                         if (non_blocking) {
13300                                 /* Non-blocking io in place out */
13301                                 goto skip_out_eof;
13302                         }
13303                         /* What about the INIT, send it maybe */
13304                         if (queue_only_for_init) {
13305                                 if (hold_tcblock == 0) {
13306                                         SCTP_TCB_LOCK(stcb);
13307                                         hold_tcblock = 1;
13308                                 }
13309                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13310                                         /* a collision took us forward? */
13311                                         queue_only = 0;
13312                                 } else {
13313                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13314                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13315                                         queue_only = 1;
13316                                 }
13317                         }
13318                         if ((net->flight_size > net->cwnd) &&
13319                             (asoc->sctp_cmt_on_off == 0)) {
13320                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13321                                 queue_only = 1;
13322                         } else if (asoc->ifp_had_enobuf) {
13323                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13324                                 if (net->flight_size > (2 * net->mtu)) {
13325                                         queue_only = 1;
13326                                 }
13327                                 asoc->ifp_had_enobuf = 0;
13328                         }
13329                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13330                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13331                             (stcb->asoc.total_flight > 0) &&
13332                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13333                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13334
13335                                 /*-
13336                                  * Ok, Nagle is set on and we have data outstanding.
13337                                  * Don't send anything and let SACKs drive out the
13338                                  * data unless we have a "full" segment to send.
13339                                  */
13340                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13341                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13342                                 }
13343                                 SCTP_STAT_INCR(sctps_naglequeued);
13344                                 nagle_applies = 1;
13345                         } else {
13346                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13347                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13348                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13349                                 }
13350                                 SCTP_STAT_INCR(sctps_naglesent);
13351                                 nagle_applies = 0;
13352                         }
13353                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13354
13355                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13356                                     nagle_applies, un_sent);
13357                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13358                                     stcb->asoc.total_flight,
13359                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13360                         }
13361                         if (queue_only_for_init)
13362                                 queue_only_for_init = 0;
13363                         if ((queue_only == 0) && (nagle_applies == 0)) {
13364                                 /*-
13365                                  * need to start chunk output
13366                                  * before blocking.. note that if
13367                                  * a lock is already applied, then
13368                                  * the input via the net is happening
13369                                  * and I don't need to start output :-D
13370                                  */
13371                                 if (hold_tcblock == 0) {
13372                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13373                                                 hold_tcblock = 1;
13374                                                 sctp_chunk_output(inp,
13375                                                     stcb,
13376                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13377                                         }
13378                                 } else {
13379                                         sctp_chunk_output(inp,
13380                                             stcb,
13381                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13382                                 }
13383                                 if (hold_tcblock == 1) {
13384                                         SCTP_TCB_UNLOCK(stcb);
13385                                         hold_tcblock = 0;
13386                                 }
13387                         }
13388                         SOCKBUF_LOCK(&so->so_snd);
13389                         /*-
13390                          * This is a bit strange, but I think it will
13391                          * work. The total_output_queue_size is locked and
13392                          * protected by the TCB_LOCK, which we just released.
13393                          * There is a race that can occur between releasing it
13394                          * above, and me getting the socket lock, where sacks
13395                          * come in but we have not put the SB_WAIT on the
13396                          * so_snd buffer to get the wakeup. After the LOCK
13397                          * is applied the sack_processing will also need to
13398                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13399                          * once we have the socket buffer lock if we recheck the
13400                          * size we KNOW we will get to sleep safely with the
13401                          * wakeup flag in place.
13402                          */
13403                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13404                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13405                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13406                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13407                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13408                                             asoc, (size_t)uio->uio_resid);
13409                                 }
13410                                 be.error = 0;
13411                                 stcb->block_entry = &be;
13412                                 error = sbwait(&so->so_snd);
13413                                 stcb->block_entry = NULL;
13414
13415                                 if (error || so->so_error || be.error) {
13416                                         if (error == 0) {
13417                                                 if (so->so_error)
13418                                                         error = so->so_error;
13419                                                 if (be.error) {
13420                                                         error = be.error;
13421                                                 }
13422                                         }
13423                                         SOCKBUF_UNLOCK(&so->so_snd);
13424                                         goto out_unlocked;
13425                                 }
13426
13427                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13428                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13429                                             asoc, stcb->asoc.total_output_queue_size);
13430                                 }
13431                         }
13432                         SOCKBUF_UNLOCK(&so->so_snd);
13433                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13434                                 goto out_unlocked;
13435                         }
13436                 }
13437                 SCTP_TCB_SEND_LOCK(stcb);
13438                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13439                         SCTP_TCB_SEND_UNLOCK(stcb);
13440                         goto out_unlocked;
13441                 }
13442                 if (sp) {
13443                         if (sp->msg_is_complete == 0) {
13444                                 strm->last_msg_incomplete = 1;
13445                                 if (stcb->asoc.idata_supported == 0) {
13446                                         asoc->stream_locked = 1;
13447                                         asoc->stream_locked_on = srcv->sinfo_stream;
13448                                 }
13449                         } else {
13450                                 sp->sender_all_done = 1;
13451                                 strm->last_msg_incomplete = 0;
13452                                 asoc->stream_locked = 0;
13453                         }
13454                 } else {
13455                         SCTP_PRINTF("Huh no sp TSNH?\n");
13456                         strm->last_msg_incomplete = 0;
13457                         asoc->stream_locked = 0;
13458                 }
13459                 SCTP_TCB_SEND_UNLOCK(stcb);
13460                 if (uio->uio_resid == 0) {
13461                         got_all_of_the_send = 1;
13462                 }
13463         } else {
13464                 /* We send in a 0, since we do NOT have any locks */
13465                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13466                 top = NULL;
13467                 if (srcv->sinfo_flags & SCTP_EOF) {
13468                         /*
13469                          * This should only happen for Panda for the mbuf
13470                          * send case, which does NOT yet support EEOR mode.
13471                          * Thus, we can just set this flag to do the proper
13472                          * EOF handling.
13473                          */
13474                         got_all_of_the_send = 1;
13475                 }
13476         }
13477         if (error) {
13478                 goto out;
13479         }
13480 dataless_eof:
13481         /* EOF thing ? */
13482         if ((srcv->sinfo_flags & SCTP_EOF) &&
13483             (got_all_of_the_send == 1)) {
13484                 SCTP_STAT_INCR(sctps_sends_with_eof);
13485                 error = 0;
13486                 if (hold_tcblock == 0) {
13487                         SCTP_TCB_LOCK(stcb);
13488                         hold_tcblock = 1;
13489                 }
13490                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13491                     TAILQ_EMPTY(&asoc->sent_queue) &&
13492                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13493                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13494                                 goto abort_anyway;
13495                         }
13496                         /* there is nothing queued to send, so I'm done... */
13497                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13498                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13499                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13500                                 struct sctp_nets *netp;
13501
13502                                 /* only send SHUTDOWN the first time through */
13503                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13504                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13505                                 }
13506                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13507                                 sctp_stop_timers_for_shutdown(stcb);
13508                                 if (stcb->asoc.alternate) {
13509                                         netp = stcb->asoc.alternate;
13510                                 } else {
13511                                         netp = stcb->asoc.primary_destination;
13512                                 }
13513                                 sctp_send_shutdown(stcb, netp);
13514                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13515                                     netp);
13516                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13517                                     asoc->primary_destination);
13518                         }
13519                 } else {
13520                         /*-
13521                          * we still got (or just got) data to send, so set
13522                          * SHUTDOWN_PENDING
13523                          */
13524                         /*-
13525                          * XXX sockets draft says that SCTP_EOF should be
13526                          * sent with no data.  currently, we will allow user
13527                          * data to be sent first and move to
13528                          * SHUTDOWN-PENDING
13529                          */
13530                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13531                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13532                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13533                                 if (hold_tcblock == 0) {
13534                                         SCTP_TCB_LOCK(stcb);
13535                                         hold_tcblock = 1;
13536                                 }
13537                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13538                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13539                                 }
13540                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13541                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13542                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13543                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13544                                         struct mbuf *op_err;
13545                                         char msg[SCTP_DIAG_INFO_LEN];
13546
13547                         abort_anyway:
13548                                         if (free_cnt_applied) {
13549                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13550                                                 free_cnt_applied = 0;
13551                                         }
13552                                         snprintf(msg, sizeof(msg),
13553                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13554                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13555                                             msg);
13556                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13557                                             op_err, SCTP_SO_LOCKED);
13558                                         /*
13559                                          * now relock the stcb so everything
13560                                          * is sane
13561                                          */
13562                                         hold_tcblock = 0;
13563                                         stcb = NULL;
13564                                         goto out;
13565                                 }
13566                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13567                                     asoc->primary_destination);
13568                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13569                         }
13570                 }
13571         }
13572 skip_out_eof:
13573         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13574                 some_on_control = 1;
13575         }
13576         if (queue_only_for_init) {
13577                 if (hold_tcblock == 0) {
13578                         SCTP_TCB_LOCK(stcb);
13579                         hold_tcblock = 1;
13580                 }
13581                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13582                         /* a collision took us forward? */
13583                         queue_only = 0;
13584                 } else {
13585                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13586                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13587                         queue_only = 1;
13588                 }
13589         }
13590         if ((net->flight_size > net->cwnd) &&
13591             (stcb->asoc.sctp_cmt_on_off == 0)) {
13592                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13593                 queue_only = 1;
13594         } else if (asoc->ifp_had_enobuf) {
13595                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13596                 if (net->flight_size > (2 * net->mtu)) {
13597                         queue_only = 1;
13598                 }
13599                 asoc->ifp_had_enobuf = 0;
13600         }
13601         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13602         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13603             (stcb->asoc.total_flight > 0) &&
13604             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13605             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13606                 /*-
13607                  * Ok, Nagle is set on and we have data outstanding.
13608                  * Don't send anything and let SACKs drive out the
13609                  * data unless wen have a "full" segment to send.
13610                  */
13611                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13612                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13613                 }
13614                 SCTP_STAT_INCR(sctps_naglequeued);
13615                 nagle_applies = 1;
13616         } else {
13617                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13618                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13619                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13620                 }
13621                 SCTP_STAT_INCR(sctps_naglesent);
13622                 nagle_applies = 0;
13623         }
13624         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13625                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13626                     nagle_applies, un_sent);
13627                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13628                     stcb->asoc.total_flight,
13629                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13630         }
13631         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13632                 /* we can attempt to send too. */
13633                 if (hold_tcblock == 0) {
13634                         /*
13635                          * If there is activity recv'ing sacks no need to
13636                          * send
13637                          */
13638                         if (SCTP_TCB_TRYLOCK(stcb)) {
13639                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13640                                 hold_tcblock = 1;
13641                         }
13642                 } else {
13643                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13644                 }
13645         } else if ((queue_only == 0) &&
13646                     (stcb->asoc.peers_rwnd == 0) &&
13647             (stcb->asoc.total_flight == 0)) {
13648                 /* We get to have a probe outstanding */
13649                 if (hold_tcblock == 0) {
13650                         hold_tcblock = 1;
13651                         SCTP_TCB_LOCK(stcb);
13652                 }
13653                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13654         } else if (some_on_control) {
13655                 int num_out, reason, frag_point;
13656
13657                 /* Here we do control only */
13658                 if (hold_tcblock == 0) {
13659                         hold_tcblock = 1;
13660                         SCTP_TCB_LOCK(stcb);
13661                 }
13662                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13663                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13664                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13665         }
13666         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13667             queue_only, stcb->asoc.peers_rwnd, un_sent,
13668             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13669             stcb->asoc.total_output_queue_size, error);
13670
13671 out:
13672 out_unlocked:
13673
13674         if (local_soresv && stcb) {
13675                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13676         }
13677         if (create_lock_applied) {
13678                 SCTP_ASOC_CREATE_UNLOCK(inp);
13679         }
13680         if ((stcb) && hold_tcblock) {
13681                 SCTP_TCB_UNLOCK(stcb);
13682         }
13683         if (stcb && free_cnt_applied) {
13684                 atomic_add_int(&stcb->asoc.refcnt, -1);
13685         }
13686 #ifdef INVARIANTS
13687         if (stcb) {
13688                 if (mtx_owned(&stcb->tcb_mtx)) {
13689                         panic("Leaving with tcb mtx owned?");
13690                 }
13691                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13692                         panic("Leaving with tcb send mtx owned?");
13693                 }
13694         }
13695 #endif
13696         if (top) {
13697                 sctp_m_freem(top);
13698         }
13699         if (control) {
13700                 sctp_m_freem(control);
13701         }
13702         return (error);
13703 }
13704
13705
13706 /*
13707  * generate an AUTHentication chunk, if required
13708  */
13709 struct mbuf *
13710 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13711     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13712     struct sctp_tcb *stcb, uint8_t chunk)
13713 {
13714         struct mbuf *m_auth;
13715         struct sctp_auth_chunk *auth;
13716         int chunk_len;
13717         struct mbuf *cn;
13718
13719         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13720             (stcb == NULL))
13721                 return (m);
13722
13723         if (stcb->asoc.auth_supported == 0) {
13724                 return (m);
13725         }
13726         /* does the requested chunk require auth? */
13727         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13728                 return (m);
13729         }
13730         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13731         if (m_auth == NULL) {
13732                 /* no mbuf's */
13733                 return (m);
13734         }
13735         /* reserve some space if this will be the first mbuf */
13736         if (m == NULL)
13737                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13738         /* fill in the AUTH chunk details */
13739         auth = mtod(m_auth, struct sctp_auth_chunk *);
13740         memset(auth, 0, sizeof(*auth));
13741         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13742         auth->ch.chunk_flags = 0;
13743         chunk_len = sizeof(*auth) +
13744             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13745         auth->ch.chunk_length = htons(chunk_len);
13746         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13747         /* key id and hmac digest will be computed and filled in upon send */
13748
13749         /* save the offset where the auth was inserted into the chain */
13750         *offset = 0;
13751         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13752                 *offset += SCTP_BUF_LEN(cn);
13753         }
13754
13755         /* update length and return pointer to the auth chunk */
13756         SCTP_BUF_LEN(m_auth) = chunk_len;
13757         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13758         if (auth_ret != NULL)
13759                 *auth_ret = auth;
13760
13761         return (m);
13762 }
13763
13764 #ifdef INET6
13765 int
13766 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13767 {
13768         struct nd_prefix *pfx = NULL;
13769         struct nd_pfxrouter *pfxrtr = NULL;
13770         struct sockaddr_in6 gw6;
13771
13772         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13773                 return (0);
13774
13775         /* get prefix entry of address */
13776         ND6_RLOCK();
13777         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13778                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13779                         continue;
13780                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13781                     &src6->sin6_addr, &pfx->ndpr_mask))
13782                         break;
13783         }
13784         /* no prefix entry in the prefix list */
13785         if (pfx == NULL) {
13786                 ND6_RUNLOCK();
13787                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13788                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13789                 return (0);
13790         }
13791
13792         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13793         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13794
13795         /* search installed gateway from prefix entry */
13796         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13797                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13798                 gw6.sin6_family = AF_INET6;
13799                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13800                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13801                     sizeof(struct in6_addr));
13802                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13803                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13804                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13805                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13806                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13807                         ND6_RUNLOCK();
13808                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13809                         return (1);
13810                 }
13811         }
13812         ND6_RUNLOCK();
13813         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13814         return (0);
13815 }
13816 #endif
13817
13818 int
13819 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13820 {
13821 #ifdef INET
13822         struct sockaddr_in *sin, *mask;
13823         struct ifaddr *ifa;
13824         struct in_addr srcnetaddr, gwnetaddr;
13825
13826         if (ro == NULL || ro->ro_rt == NULL ||
13827             sifa->address.sa.sa_family != AF_INET) {
13828                 return (0);
13829         }
13830         ifa = (struct ifaddr *)sifa->ifa;
13831         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13832         sin = &sifa->address.sin;
13833         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13834         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13835         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13836         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13837
13838         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13839         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13840         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13841         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13842         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13843         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13844                 return (1);
13845         }
13846 #endif
13847         return (0);
13848 }