sys/netinet/sctp_output.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #if defined(INET) || defined(INET6)
  56 #include <netinet/udp.h>
  57 #endif
  58 #include <netinet/udp_var.h>
  59 #include <machine/in_cksum.h>
  60 #include <netinet/in_kdtrace.h>
  61
  62
  63
  64 #define SCTP_MAX_GAPS_INARRAY 4
  65 struct sack_track {
  66         uint8_t right_edge;     /* mergable on the right edge */
  67         uint8_t left_edge;      /* mergable on the left edge */
  68         uint8_t num_entries;
  69         uint8_t spare;
  70         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  71 };
  72
  73 const struct sack_track sack_array[256] = {
  74         {0, 0, 0, 0,            /* 0x00 */
  75                 {{0, 0},
  76                 {0, 0},
  77                 {0, 0},
  78                 {0, 0}
  79                 }
  80         },
  81         {1, 0, 1, 0,            /* 0x01 */
  82                 {{0, 0},
  83                 {0, 0},
  84                 {0, 0},
  85                 {0, 0}
  86                 }
  87         },
  88         {0, 0, 1, 0,            /* 0x02 */
  89                 {{1, 1},
  90                 {0, 0},
  91                 {0, 0},
  92                 {0, 0}
  93                 }
  94         },
  95         {1, 0, 1, 0,            /* 0x03 */
  96                 {{0, 1},
  97                 {0, 0},
  98                 {0, 0},
  99                 {0, 0}
 100                 }
 101         },
 102         {0, 0, 1, 0,            /* 0x04 */
 103                 {{2, 2},
 104                 {0, 0},
 105                 {0, 0},
 106                 {0, 0}
 107                 }
 108         },
 109         {1, 0, 2, 0,            /* 0x05 */
 110                 {{0, 0},
 111                 {2, 2},
 112                 {0, 0},
 113                 {0, 0}
 114                 }
 115         },
 116         {0, 0, 1, 0,            /* 0x06 */
 117                 {{1, 2},
 118                 {0, 0},
 119                 {0, 0},
 120                 {0, 0}
 121                 }
 122         },
 123         {1, 0, 1, 0,            /* 0x07 */
 124                 {{0, 2},
 125                 {0, 0},
 126                 {0, 0},
 127                 {0, 0}
 128                 }
 129         },
 130         {0, 0, 1, 0,            /* 0x08 */
 131                 {{3, 3},
 132                 {0, 0},
 133                 {0, 0},
 134                 {0, 0}
 135                 }
 136         },
 137         {1, 0, 2, 0,            /* 0x09 */
 138                 {{0, 0},
 139                 {3, 3},
 140                 {0, 0},
 141                 {0, 0}
 142                 }
 143         },
 144         {0, 0, 2, 0,            /* 0x0a */
 145                 {{1, 1},
 146                 {3, 3},
 147                 {0, 0},
 148                 {0, 0}
 149                 }
 150         },
 151         {1, 0, 2, 0,            /* 0x0b */
 152                 {{0, 1},
 153                 {3, 3},
 154                 {0, 0},
 155                 {0, 0}
 156                 }
 157         },
 158         {0, 0, 1, 0,            /* 0x0c */
 159                 {{2, 3},
 160                 {0, 0},
 161                 {0, 0},
 162                 {0, 0}
 163                 }
 164         },
 165         {1, 0, 2, 0,            /* 0x0d */
 166                 {{0, 0},
 167                 {2, 3},
 168                 {0, 0},
 169                 {0, 0}
 170                 }
 171         },
 172         {0, 0, 1, 0,            /* 0x0e */
 173                 {{1, 3},
 174                 {0, 0},
 175                 {0, 0},
 176                 {0, 0}
 177                 }
 178         },
 179         {1, 0, 1, 0,            /* 0x0f */
 180                 {{0, 3},
 181                 {0, 0},
 182                 {0, 0},
 183                 {0, 0}
 184                 }
 185         },
 186         {0, 0, 1, 0,            /* 0x10 */
 187                 {{4, 4},
 188                 {0, 0},
 189                 {0, 0},
 190                 {0, 0}
 191                 }
 192         },
 193         {1, 0, 2, 0,            /* 0x11 */
 194                 {{0, 0},
 195                 {4, 4},
 196                 {0, 0},
 197                 {0, 0}
 198                 }
 199         },
 200         {0, 0, 2, 0,            /* 0x12 */
 201                 {{1, 1},
 202                 {4, 4},
 203                 {0, 0},
 204                 {0, 0}
 205                 }
 206         },
 207         {1, 0, 2, 0,            /* 0x13 */
 208                 {{0, 1},
 209                 {4, 4},
 210                 {0, 0},
 211                 {0, 0}
 212                 }
 213         },
 214         {0, 0, 2, 0,            /* 0x14 */
 215                 {{2, 2},
 216                 {4, 4},
 217                 {0, 0},
 218                 {0, 0}
 219                 }
 220         },
 221         {1, 0, 3, 0,            /* 0x15 */
 222                 {{0, 0},
 223                 {2, 2},
 224                 {4, 4},
 225                 {0, 0}
 226                 }
 227         },
 228         {0, 0, 2, 0,            /* 0x16 */
 229                 {{1, 2},
 230                 {4, 4},
 231                 {0, 0},
 232                 {0, 0}
 233                 }
 234         },
 235         {1, 0, 2, 0,            /* 0x17 */
 236                 {{0, 2},
 237                 {4, 4},
 238                 {0, 0},
 239                 {0, 0}
 240                 }
 241         },
 242         {0, 0, 1, 0,            /* 0x18 */
 243                 {{3, 4},
 244                 {0, 0},
 245                 {0, 0},
 246                 {0, 0}
 247                 }
 248         },
 249         {1, 0, 2, 0,            /* 0x19 */
 250                 {{0, 0},
 251                 {3, 4},
 252                 {0, 0},
 253                 {0, 0}
 254                 }
 255         },
 256         {0, 0, 2, 0,            /* 0x1a */
 257                 {{1, 1},
 258                 {3, 4},
 259                 {0, 0},
 260                 {0, 0}
 261                 }
 262         },
 263         {1, 0, 2, 0,            /* 0x1b */
 264                 {{0, 1},
 265                 {3, 4},
 266                 {0, 0},
 267                 {0, 0}
 268                 }
 269         },
 270         {0, 0, 1, 0,            /* 0x1c */
 271                 {{2, 4},
 272                 {0, 0},
 273                 {0, 0},
 274                 {0, 0}
 275                 }
 276         },
 277         {1, 0, 2, 0,            /* 0x1d */
 278                 {{0, 0},
 279                 {2, 4},
 280                 {0, 0},
 281                 {0, 0}
 282                 }
 283         },
 284         {0, 0, 1, 0,            /* 0x1e */
 285                 {{1, 4},
 286                 {0, 0},
 287                 {0, 0},
 288                 {0, 0}
 289                 }
 290         },
 291         {1, 0, 1, 0,            /* 0x1f */
 292                 {{0, 4},
 293                 {0, 0},
 294                 {0, 0},
 295                 {0, 0}
 296                 }
 297         },
 298         {0, 0, 1, 0,            /* 0x20 */
 299                 {{5, 5},
 300                 {0, 0},
 301                 {0, 0},
 302                 {0, 0}
 303                 }
 304         },
 305         {1, 0, 2, 0,            /* 0x21 */
 306                 {{0, 0},
 307                 {5, 5},
 308                 {0, 0},
 309                 {0, 0}
 310                 }
 311         },
 312         {0, 0, 2, 0,            /* 0x22 */
 313                 {{1, 1},
 314                 {5, 5},
 315                 {0, 0},
 316                 {0, 0}
 317                 }
 318         },
 319         {1, 0, 2, 0,            /* 0x23 */
 320                 {{0, 1},
 321                 {5, 5},
 322                 {0, 0},
 323                 {0, 0}
 324                 }
 325         },
 326         {0, 0, 2, 0,            /* 0x24 */
 327                 {{2, 2},
 328                 {5, 5},
 329                 {0, 0},
 330                 {0, 0}
 331                 }
 332         },
 333         {1, 0, 3, 0,            /* 0x25 */
 334                 {{0, 0},
 335                 {2, 2},
 336                 {5, 5},
 337                 {0, 0}
 338                 }
 339         },
 340         {0, 0, 2, 0,            /* 0x26 */
 341                 {{1, 2},
 342                 {5, 5},
 343                 {0, 0},
 344                 {0, 0}
 345                 }
 346         },
 347         {1, 0, 2, 0,            /* 0x27 */
 348                 {{0, 2},
 349                 {5, 5},
 350                 {0, 0},
 351                 {0, 0}
 352                 }
 353         },
 354         {0, 0, 2, 0,            /* 0x28 */
 355                 {{3, 3},
 356                 {5, 5},
 357                 {0, 0},
 358                 {0, 0}
 359                 }
 360         },
 361         {1, 0, 3, 0,            /* 0x29 */
 362                 {{0, 0},
 363                 {3, 3},
 364                 {5, 5},
 365                 {0, 0}
 366                 }
 367         },
 368         {0, 0, 3, 0,            /* 0x2a */
 369                 {{1, 1},
 370                 {3, 3},
 371                 {5, 5},
 372                 {0, 0}
 373                 }
 374         },
 375         {1, 0, 3, 0,            /* 0x2b */
 376                 {{0, 1},
 377                 {3, 3},
 378                 {5, 5},
 379                 {0, 0}
 380                 }
 381         },
 382         {0, 0, 2, 0,            /* 0x2c */
 383                 {{2, 3},
 384                 {5, 5},
 385                 {0, 0},
 386                 {0, 0}
 387                 }
 388         },
 389         {1, 0, 3, 0,            /* 0x2d */
 390                 {{0, 0},
 391                 {2, 3},
 392                 {5, 5},
 393                 {0, 0}
 394                 }
 395         },
 396         {0, 0, 2, 0,            /* 0x2e */
 397                 {{1, 3},
 398                 {5, 5},
 399                 {0, 0},
 400                 {0, 0}
 401                 }
 402         },
 403         {1, 0, 2, 0,            /* 0x2f */
 404                 {{0, 3},
 405                 {5, 5},
 406                 {0, 0},
 407                 {0, 0}
 408                 }
 409         },
 410         {0, 0, 1, 0,            /* 0x30 */
 411                 {{4, 5},
 412                 {0, 0},
 413                 {0, 0},
 414                 {0, 0}
 415                 }
 416         },
 417         {1, 0, 2, 0,            /* 0x31 */
 418                 {{0, 0},
 419                 {4, 5},
 420                 {0, 0},
 421                 {0, 0}
 422                 }
 423         },
 424         {0, 0, 2, 0,            /* 0x32 */
 425                 {{1, 1},
 426                 {4, 5},
 427                 {0, 0},
 428                 {0, 0}
 429                 }
 430         },
 431         {1, 0, 2, 0,            /* 0x33 */
 432                 {{0, 1},
 433                 {4, 5},
 434                 {0, 0},
 435                 {0, 0}
 436                 }
 437         },
 438         {0, 0, 2, 0,            /* 0x34 */
 439                 {{2, 2},
 440                 {4, 5},
 441                 {0, 0},
 442                 {0, 0}
 443                 }
 444         },
 445         {1, 0, 3, 0,            /* 0x35 */
 446                 {{0, 0},
 447                 {2, 2},
 448                 {4, 5},
 449                 {0, 0}
 450                 }
 451         },
 452         {0, 0, 2, 0,            /* 0x36 */
 453                 {{1, 2},
 454                 {4, 5},
 455                 {0, 0},
 456                 {0, 0}
 457                 }
 458         },
 459         {1, 0, 2, 0,            /* 0x37 */
 460                 {{0, 2},
 461                 {4, 5},
 462                 {0, 0},
 463                 {0, 0}
 464                 }
 465         },
 466         {0, 0, 1, 0,            /* 0x38 */
 467                 {{3, 5},
 468                 {0, 0},
 469                 {0, 0},
 470                 {0, 0}
 471                 }
 472         },
 473         {1, 0, 2, 0,            /* 0x39 */
 474                 {{0, 0},
 475                 {3, 5},
 476                 {0, 0},
 477                 {0, 0}
 478                 }
 479         },
 480         {0, 0, 2, 0,            /* 0x3a */
 481                 {{1, 1},
 482                 {3, 5},
 483                 {0, 0},
 484                 {0, 0}
 485                 }
 486         },
 487         {1, 0, 2, 0,            /* 0x3b */
 488                 {{0, 1},
 489                 {3, 5},
 490                 {0, 0},
 491                 {0, 0}
 492                 }
 493         },
 494         {0, 0, 1, 0,            /* 0x3c */
 495                 {{2, 5},
 496                 {0, 0},
 497                 {0, 0},
 498                 {0, 0}
 499                 }
 500         },
 501         {1, 0, 2, 0,            /* 0x3d */
 502                 {{0, 0},
 503                 {2, 5},
 504                 {0, 0},
 505                 {0, 0}
 506                 }
 507         },
 508         {0, 0, 1, 0,            /* 0x3e */
 509                 {{1, 5},
 510                 {0, 0},
 511                 {0, 0},
 512                 {0, 0}
 513                 }
 514         },
 515         {1, 0, 1, 0,            /* 0x3f */
 516                 {{0, 5},
 517                 {0, 0},
 518                 {0, 0},
 519                 {0, 0}
 520                 }
 521         },
 522         {0, 0, 1, 0,            /* 0x40 */
 523                 {{6, 6},
 524                 {0, 0},
 525                 {0, 0},
 526                 {0, 0}
 527                 }
 528         },
 529         {1, 0, 2, 0,            /* 0x41 */
 530                 {{0, 0},
 531                 {6, 6},
 532                 {0, 0},
 533                 {0, 0}
 534                 }
 535         },
 536         {0, 0, 2, 0,            /* 0x42 */
 537                 {{1, 1},
 538                 {6, 6},
 539                 {0, 0},
 540                 {0, 0}
 541                 }
 542         },
 543         {1, 0, 2, 0,            /* 0x43 */
 544                 {{0, 1},
 545                 {6, 6},
 546                 {0, 0},
 547                 {0, 0}
 548                 }
 549         },
 550         {0, 0, 2, 0,            /* 0x44 */
 551                 {{2, 2},
 552                 {6, 6},
 553                 {0, 0},
 554                 {0, 0}
 555                 }
 556         },
 557         {1, 0, 3, 0,            /* 0x45 */
 558                 {{0, 0},
 559                 {2, 2},
 560                 {6, 6},
 561                 {0, 0}
 562                 }
 563         },
 564         {0, 0, 2, 0,            /* 0x46 */
 565                 {{1, 2},
 566                 {6, 6},
 567                 {0, 0},
 568                 {0, 0}
 569                 }
 570         },
 571         {1, 0, 2, 0,            /* 0x47 */
 572                 {{0, 2},
 573                 {6, 6},
 574                 {0, 0},
 575                 {0, 0}
 576                 }
 577         },
 578         {0, 0, 2, 0,            /* 0x48 */
 579                 {{3, 3},
 580                 {6, 6},
 581                 {0, 0},
 582                 {0, 0}
 583                 }
 584         },
 585         {1, 0, 3, 0,            /* 0x49 */
 586                 {{0, 0},
 587                 {3, 3},
 588                 {6, 6},
 589                 {0, 0}
 590                 }
 591         },
 592         {0, 0, 3, 0,            /* 0x4a */
 593                 {{1, 1},
 594                 {3, 3},
 595                 {6, 6},
 596                 {0, 0}
 597                 }
 598         },
 599         {1, 0, 3, 0,            /* 0x4b */
 600                 {{0, 1},
 601                 {3, 3},
 602                 {6, 6},
 603                 {0, 0}
 604                 }
 605         },
 606         {0, 0, 2, 0,            /* 0x4c */
 607                 {{2, 3},
 608                 {6, 6},
 609                 {0, 0},
 610                 {0, 0}
 611                 }
 612         },
 613         {1, 0, 3, 0,            /* 0x4d */
 614                 {{0, 0},
 615                 {2, 3},
 616                 {6, 6},
 617                 {0, 0}
 618                 }
 619         },
 620         {0, 0, 2, 0,            /* 0x4e */
 621                 {{1, 3},
 622                 {6, 6},
 623                 {0, 0},
 624                 {0, 0}
 625                 }
 626         },
 627         {1, 0, 2, 0,            /* 0x4f */
 628                 {{0, 3},
 629                 {6, 6},
 630                 {0, 0},
 631                 {0, 0}
 632                 }
 633         },
 634         {0, 0, 2, 0,            /* 0x50 */
 635                 {{4, 4},
 636                 {6, 6},
 637                 {0, 0},
 638                 {0, 0}
 639                 }
 640         },
 641         {1, 0, 3, 0,            /* 0x51 */
 642                 {{0, 0},
 643                 {4, 4},
 644                 {6, 6},
 645                 {0, 0}
 646                 }
 647         },
 648         {0, 0, 3, 0,            /* 0x52 */
 649                 {{1, 1},
 650                 {4, 4},
 651                 {6, 6},
 652                 {0, 0}
 653                 }
 654         },
 655         {1, 0, 3, 0,            /* 0x53 */
 656                 {{0, 1},
 657                 {4, 4},
 658                 {6, 6},
 659                 {0, 0}
 660                 }
 661         },
 662         {0, 0, 3, 0,            /* 0x54 */
 663                 {{2, 2},
 664                 {4, 4},
 665                 {6, 6},
 666                 {0, 0}
 667                 }
 668         },
 669         {1, 0, 4, 0,            /* 0x55 */
 670                 {{0, 0},
 671                 {2, 2},
 672                 {4, 4},
 673                 {6, 6}
 674                 }
 675         },
 676         {0, 0, 3, 0,            /* 0x56 */
 677                 {{1, 2},
 678                 {4, 4},
 679                 {6, 6},
 680                 {0, 0}
 681                 }
 682         },
 683         {1, 0, 3, 0,            /* 0x57 */
 684                 {{0, 2},
 685                 {4, 4},
 686                 {6, 6},
 687                 {0, 0}
 688                 }
 689         },
 690         {0, 0, 2, 0,            /* 0x58 */
 691                 {{3, 4},
 692                 {6, 6},
 693                 {0, 0},
 694                 {0, 0}
 695                 }
 696         },
 697         {1, 0, 3, 0,            /* 0x59 */
 698                 {{0, 0},
 699                 {3, 4},
 700                 {6, 6},
 701                 {0, 0}
 702                 }
 703         },
 704         {0, 0, 3, 0,            /* 0x5a */
 705                 {{1, 1},
 706                 {3, 4},
 707                 {6, 6},
 708                 {0, 0}
 709                 }
 710         },
 711         {1, 0, 3, 0,            /* 0x5b */
 712                 {{0, 1},
 713                 {3, 4},
 714                 {6, 6},
 715                 {0, 0}
 716                 }
 717         },
 718         {0, 0, 2, 0,            /* 0x5c */
 719                 {{2, 4},
 720                 {6, 6},
 721                 {0, 0},
 722                 {0, 0}
 723                 }
 724         },
 725         {1, 0, 3, 0,            /* 0x5d */
 726                 {{0, 0},
 727                 {2, 4},
 728                 {6, 6},
 729                 {0, 0}
 730                 }
 731         },
 732         {0, 0, 2, 0,            /* 0x5e */
 733                 {{1, 4},
 734                 {6, 6},
 735                 {0, 0},
 736                 {0, 0}
 737                 }
 738         },
 739         {1, 0, 2, 0,            /* 0x5f */
 740                 {{0, 4},
 741                 {6, 6},
 742                 {0, 0},
 743                 {0, 0}
 744                 }
 745         },
 746         {0, 0, 1, 0,            /* 0x60 */
 747                 {{5, 6},
 748                 {0, 0},
 749                 {0, 0},
 750                 {0, 0}
 751                 }
 752         },
 753         {1, 0, 2, 0,            /* 0x61 */
 754                 {{0, 0},
 755                 {5, 6},
 756                 {0, 0},
 757                 {0, 0}
 758                 }
 759         },
 760         {0, 0, 2, 0,            /* 0x62 */
 761                 {{1, 1},
 762                 {5, 6},
 763                 {0, 0},
 764                 {0, 0}
 765                 }
 766         },
 767         {1, 0, 2, 0,            /* 0x63 */
 768                 {{0, 1},
 769                 {5, 6},
 770                 {0, 0},
 771                 {0, 0}
 772                 }
 773         },
 774         {0, 0, 2, 0,            /* 0x64 */
 775                 {{2, 2},
 776                 {5, 6},
 777                 {0, 0},
 778                 {0, 0}
 779                 }
 780         },
 781         {1, 0, 3, 0,            /* 0x65 */
 782                 {{0, 0},
 783                 {2, 2},
 784                 {5, 6},
 785                 {0, 0}
 786                 }
 787         },
 788         {0, 0, 2, 0,            /* 0x66 */
 789                 {{1, 2},
 790                 {5, 6},
 791                 {0, 0},
 792                 {0, 0}
 793                 }
 794         },
 795         {1, 0, 2, 0,            /* 0x67 */
 796                 {{0, 2},
 797                 {5, 6},
 798                 {0, 0},
 799                 {0, 0}
 800                 }
 801         },
 802         {0, 0, 2, 0,            /* 0x68 */
 803                 {{3, 3},
 804                 {5, 6},
 805                 {0, 0},
 806                 {0, 0}
 807                 }
 808         },
 809         {1, 0, 3, 0,            /* 0x69 */
 810                 {{0, 0},
 811                 {3, 3},
 812                 {5, 6},
 813                 {0, 0}
 814                 }
 815         },
 816         {0, 0, 3, 0,            /* 0x6a */
 817                 {{1, 1},
 818                 {3, 3},
 819                 {5, 6},
 820                 {0, 0}
 821                 }
 822         },
 823         {1, 0, 3, 0,            /* 0x6b */
 824                 {{0, 1},
 825                 {3, 3},
 826                 {5, 6},
 827                 {0, 0}
 828                 }
 829         },
 830         {0, 0, 2, 0,            /* 0x6c */
 831                 {{2, 3},
 832                 {5, 6},
 833                 {0, 0},
 834                 {0, 0}
 835                 }
 836         },
 837         {1, 0, 3, 0,            /* 0x6d */
 838                 {{0, 0},
 839                 {2, 3},
 840                 {5, 6},
 841                 {0, 0}
 842                 }
 843         },
 844         {0, 0, 2, 0,            /* 0x6e */
 845                 {{1, 3},
 846                 {5, 6},
 847                 {0, 0},
 848                 {0, 0}
 849                 }
 850         },
 851         {1, 0, 2, 0,            /* 0x6f */
 852                 {{0, 3},
 853                 {5, 6},
 854                 {0, 0},
 855                 {0, 0}
 856                 }
 857         },
 858         {0, 0, 1, 0,            /* 0x70 */
 859                 {{4, 6},
 860                 {0, 0},
 861                 {0, 0},
 862                 {0, 0}
 863                 }
 864         },
 865         {1, 0, 2, 0,            /* 0x71 */
 866                 {{0, 0},
 867                 {4, 6},
 868                 {0, 0},
 869                 {0, 0}
 870                 }
 871         },
 872         {0, 0, 2, 0,            /* 0x72 */
 873                 {{1, 1},
 874                 {4, 6},
 875                 {0, 0},
 876                 {0, 0}
 877                 }
 878         },
 879         {1, 0, 2, 0,            /* 0x73 */
 880                 {{0, 1},
 881                 {4, 6},
 882                 {0, 0},
 883                 {0, 0}
 884                 }
 885         },
 886         {0, 0, 2, 0,            /* 0x74 */
 887                 {{2, 2},
 888                 {4, 6},
 889                 {0, 0},
 890                 {0, 0}
 891                 }
 892         },
 893         {1, 0, 3, 0,            /* 0x75 */
 894                 {{0, 0},
 895                 {2, 2},
 896                 {4, 6},
 897                 {0, 0}
 898                 }
 899         },
 900         {0, 0, 2, 0,            /* 0x76 */
 901                 {{1, 2},
 902                 {4, 6},
 903                 {0, 0},
 904                 {0, 0}
 905                 }
 906         },
 907         {1, 0, 2, 0,            /* 0x77 */
 908                 {{0, 2},
 909                 {4, 6},
 910                 {0, 0},
 911                 {0, 0}
 912                 }
 913         },
 914         {0, 0, 1, 0,            /* 0x78 */
 915                 {{3, 6},
 916                 {0, 0},
 917                 {0, 0},
 918                 {0, 0}
 919                 }
 920         },
 921         {1, 0, 2, 0,            /* 0x79 */
 922                 {{0, 0},
 923                 {3, 6},
 924                 {0, 0},
 925                 {0, 0}
 926                 }
 927         },
 928         {0, 0, 2, 0,            /* 0x7a */
 929                 {{1, 1},
 930                 {3, 6},
 931                 {0, 0},
 932                 {0, 0}
 933                 }
 934         },
 935         {1, 0, 2, 0,            /* 0x7b */
 936                 {{0, 1},
 937                 {3, 6},
 938                 {0, 0},
 939                 {0, 0}
 940                 }
 941         },
 942         {0, 0, 1, 0,            /* 0x7c */
 943                 {{2, 6},
 944                 {0, 0},
 945                 {0, 0},
 946                 {0, 0}
 947                 }
 948         },
 949         {1, 0, 2, 0,            /* 0x7d */
 950                 {{0, 0},
 951                 {2, 6},
 952                 {0, 0},
 953                 {0, 0}
 954                 }
 955         },
 956         {0, 0, 1, 0,            /* 0x7e */
 957                 {{1, 6},
 958                 {0, 0},
 959                 {0, 0},
 960                 {0, 0}
 961                 }
 962         },
 963         {1, 0, 1, 0,            /* 0x7f */
 964                 {{0, 6},
 965                 {0, 0},
 966                 {0, 0},
 967                 {0, 0}
 968                 }
 969         },
 970         {0, 1, 1, 0,            /* 0x80 */
 971                 {{7, 7},
 972                 {0, 0},
 973                 {0, 0},
 974                 {0, 0}
 975                 }
 976         },
 977         {1, 1, 2, 0,            /* 0x81 */
 978                 {{0, 0},
 979                 {7, 7},
 980                 {0, 0},
 981                 {0, 0}
 982                 }
 983         },
 984         {0, 1, 2, 0,            /* 0x82 */
 985                 {{1, 1},
 986                 {7, 7},
 987                 {0, 0},
 988                 {0, 0}
 989                 }
 990         },
 991         {1, 1, 2, 0,            /* 0x83 */
 992                 {{0, 1},
 993                 {7, 7},
 994                 {0, 0},
 995                 {0, 0}
 996                 }
 997         },
 998         {0, 1, 2, 0,            /* 0x84 */
 999                 {{2, 2},
1000                 {7, 7},
1001                 {0, 0},
1002                 {0, 0}
1003                 }
1004         },
1005         {1, 1, 3, 0,            /* 0x85 */
1006                 {{0, 0},
1007                 {2, 2},
1008                 {7, 7},
1009                 {0, 0}
1010                 }
1011         },
1012         {0, 1, 2, 0,            /* 0x86 */
1013                 {{1, 2},
1014                 {7, 7},
1015                 {0, 0},
1016                 {0, 0}
1017                 }
1018         },
1019         {1, 1, 2, 0,            /* 0x87 */
1020                 {{0, 2},
1021                 {7, 7},
1022                 {0, 0},
1023                 {0, 0}
1024                 }
1025         },
1026         {0, 1, 2, 0,            /* 0x88 */
1027                 {{3, 3},
1028                 {7, 7},
1029                 {0, 0},
1030                 {0, 0}
1031                 }
1032         },
1033         {1, 1, 3, 0,            /* 0x89 */
1034                 {{0, 0},
1035                 {3, 3},
1036                 {7, 7},
1037                 {0, 0}
1038                 }
1039         },
1040         {0, 1, 3, 0,            /* 0x8a */
1041                 {{1, 1},
1042                 {3, 3},
1043                 {7, 7},
1044                 {0, 0}
1045                 }
1046         },
1047         {1, 1, 3, 0,            /* 0x8b */
1048                 {{0, 1},
1049                 {3, 3},
1050                 {7, 7},
1051                 {0, 0}
1052                 }
1053         },
1054         {0, 1, 2, 0,            /* 0x8c */
1055                 {{2, 3},
1056                 {7, 7},
1057                 {0, 0},
1058                 {0, 0}
1059                 }
1060         },
1061         {1, 1, 3, 0,            /* 0x8d */
1062                 {{0, 0},
1063                 {2, 3},
1064                 {7, 7},
1065                 {0, 0}
1066                 }
1067         },
1068         {0, 1, 2, 0,            /* 0x8e */
1069                 {{1, 3},
1070                 {7, 7},
1071                 {0, 0},
1072                 {0, 0}
1073                 }
1074         },
1075         {1, 1, 2, 0,            /* 0x8f */
1076                 {{0, 3},
1077                 {7, 7},
1078                 {0, 0},
1079                 {0, 0}
1080                 }
1081         },
1082         {0, 1, 2, 0,            /* 0x90 */
1083                 {{4, 4},
1084                 {7, 7},
1085                 {0, 0},
1086                 {0, 0}
1087                 }
1088         },
1089         {1, 1, 3, 0,            /* 0x91 */
1090                 {{0, 0},
1091                 {4, 4},
1092                 {7, 7},
1093                 {0, 0}
1094                 }
1095         },
1096         {0, 1, 3, 0,            /* 0x92 */
1097                 {{1, 1},
1098                 {4, 4},
1099                 {7, 7},
1100                 {0, 0}
1101                 }
1102         },
1103         {1, 1, 3, 0,            /* 0x93 */
1104                 {{0, 1},
1105                 {4, 4},
1106                 {7, 7},
1107                 {0, 0}
1108                 }
1109         },
1110         {0, 1, 3, 0,            /* 0x94 */
1111                 {{2, 2},
1112                 {4, 4},
1113                 {7, 7},
1114                 {0, 0}
1115                 }
1116         },
1117         {1, 1, 4, 0,            /* 0x95 */
1118                 {{0, 0},
1119                 {2, 2},
1120                 {4, 4},
1121                 {7, 7}
1122                 }
1123         },
1124         {0, 1, 3, 0,            /* 0x96 */
1125                 {{1, 2},
1126                 {4, 4},
1127                 {7, 7},
1128                 {0, 0}
1129                 }
1130         },
1131         {1, 1, 3, 0,            /* 0x97 */
1132                 {{0, 2},
1133                 {4, 4},
1134                 {7, 7},
1135                 {0, 0}
1136                 }
1137         },
1138         {0, 1, 2, 0,            /* 0x98 */
1139                 {{3, 4},
1140                 {7, 7},
1141                 {0, 0},
1142                 {0, 0}
1143                 }
1144         },
1145         {1, 1, 3, 0,            /* 0x99 */
1146                 {{0, 0},
1147                 {3, 4},
1148                 {7, 7},
1149                 {0, 0}
1150                 }
1151         },
1152         {0, 1, 3, 0,            /* 0x9a */
1153                 {{1, 1},
1154                 {3, 4},
1155                 {7, 7},
1156                 {0, 0}
1157                 }
1158         },
1159         {1, 1, 3, 0,            /* 0x9b */
1160                 {{0, 1},
1161                 {3, 4},
1162                 {7, 7},
1163                 {0, 0}
1164                 }
1165         },
1166         {0, 1, 2, 0,            /* 0x9c */
1167                 {{2, 4},
1168                 {7, 7},
1169                 {0, 0},
1170                 {0, 0}
1171                 }
1172         },
1173         {1, 1, 3, 0,            /* 0x9d */
1174                 {{0, 0},
1175                 {2, 4},
1176                 {7, 7},
1177                 {0, 0}
1178                 }
1179         },
1180         {0, 1, 2, 0,            /* 0x9e */
1181                 {{1, 4},
1182                 {7, 7},
1183                 {0, 0},
1184                 {0, 0}
1185                 }
1186         },
1187         {1, 1, 2, 0,            /* 0x9f */
1188                 {{0, 4},
1189                 {7, 7},
1190                 {0, 0},
1191                 {0, 0}
1192                 }
1193         },
1194         {0, 1, 2, 0,            /* 0xa0 */
1195                 {{5, 5},
1196                 {7, 7},
1197                 {0, 0},
1198                 {0, 0}
1199                 }
1200         },
1201         {1, 1, 3, 0,            /* 0xa1 */
1202                 {{0, 0},
1203                 {5, 5},
1204                 {7, 7},
1205                 {0, 0}
1206                 }
1207         },
1208         {0, 1, 3, 0,            /* 0xa2 */
1209                 {{1, 1},
1210                 {5, 5},
1211                 {7, 7},
1212                 {0, 0}
1213                 }
1214         },
1215         {1, 1, 3, 0,            /* 0xa3 */
1216                 {{0, 1},
1217                 {5, 5},
1218                 {7, 7},
1219                 {0, 0}
1220                 }
1221         },
1222         {0, 1, 3, 0,            /* 0xa4 */
1223                 {{2, 2},
1224                 {5, 5},
1225                 {7, 7},
1226                 {0, 0}
1227                 }
1228         },
1229         {1, 1, 4, 0,            /* 0xa5 */
1230                 {{0, 0},
1231                 {2, 2},
1232                 {5, 5},
1233                 {7, 7}
1234                 }
1235         },
1236         {0, 1, 3, 0,            /* 0xa6 */
1237                 {{1, 2},
1238                 {5, 5},
1239                 {7, 7},
1240                 {0, 0}
1241                 }
1242         },
1243         {1, 1, 3, 0,            /* 0xa7 */
1244                 {{0, 2},
1245                 {5, 5},
1246                 {7, 7},
1247                 {0, 0}
1248                 }
1249         },
1250         {0, 1, 3, 0,            /* 0xa8 */
1251                 {{3, 3},
1252                 {5, 5},
1253                 {7, 7},
1254                 {0, 0}
1255                 }
1256         },
1257         {1, 1, 4, 0,            /* 0xa9 */
1258                 {{0, 0},
1259                 {3, 3},
1260                 {5, 5},
1261                 {7, 7}
1262                 }
1263         },
1264         {0, 1, 4, 0,            /* 0xaa */
1265                 {{1, 1},
1266                 {3, 3},
1267                 {5, 5},
1268                 {7, 7}
1269                 }
1270         },
1271         {1, 1, 4, 0,            /* 0xab */
1272                 {{0, 1},
1273                 {3, 3},
1274                 {5, 5},
1275                 {7, 7}
1276                 }
1277         },
1278         {0, 1, 3, 0,            /* 0xac */
1279                 {{2, 3},
1280                 {5, 5},
1281                 {7, 7},
1282                 {0, 0}
1283                 }
1284         },
1285         {1, 1, 4, 0,            /* 0xad */
1286                 {{0, 0},
1287                 {2, 3},
1288                 {5, 5},
1289                 {7, 7}
1290                 }
1291         },
1292         {0, 1, 3, 0,            /* 0xae */
1293                 {{1, 3},
1294                 {5, 5},
1295                 {7, 7},
1296                 {0, 0}
1297                 }
1298         },
1299         {1, 1, 3, 0,            /* 0xaf */
1300                 {{0, 3},
1301                 {5, 5},
1302                 {7, 7},
1303                 {0, 0}
1304                 }
1305         },
1306         {0, 1, 2, 0,            /* 0xb0 */
1307                 {{4, 5},
1308                 {7, 7},
1309                 {0, 0},
1310                 {0, 0}
1311                 }
1312         },
1313         {1, 1, 3, 0,            /* 0xb1 */
1314                 {{0, 0},
1315                 {4, 5},
1316                 {7, 7},
1317                 {0, 0}
1318                 }
1319         },
1320         {0, 1, 3, 0,            /* 0xb2 */
1321                 {{1, 1},
1322                 {4, 5},
1323                 {7, 7},
1324                 {0, 0}
1325                 }
1326         },
1327         {1, 1, 3, 0,            /* 0xb3 */
1328                 {{0, 1},
1329                 {4, 5},
1330                 {7, 7},
1331                 {0, 0}
1332                 }
1333         },
1334         {0, 1, 3, 0,            /* 0xb4 */
1335                 {{2, 2},
1336                 {4, 5},
1337                 {7, 7},
1338                 {0, 0}
1339                 }
1340         },
1341         {1, 1, 4, 0,            /* 0xb5 */
1342                 {{0, 0},
1343                 {2, 2},
1344                 {4, 5},
1345                 {7, 7}
1346                 }
1347         },
1348         {0, 1, 3, 0,            /* 0xb6 */
1349                 {{1, 2},
1350                 {4, 5},
1351                 {7, 7},
1352                 {0, 0}
1353                 }
1354         },
1355         {1, 1, 3, 0,            /* 0xb7 */
1356                 {{0, 2},
1357                 {4, 5},
1358                 {7, 7},
1359                 {0, 0}
1360                 }
1361         },
1362         {0, 1, 2, 0,            /* 0xb8 */
1363                 {{3, 5},
1364                 {7, 7},
1365                 {0, 0},
1366                 {0, 0}
1367                 }
1368         },
1369         {1, 1, 3, 0,            /* 0xb9 */
1370                 {{0, 0},
1371                 {3, 5},
1372                 {7, 7},
1373                 {0, 0}
1374                 }
1375         },
1376         {0, 1, 3, 0,            /* 0xba */
1377                 {{1, 1},
1378                 {3, 5},
1379                 {7, 7},
1380                 {0, 0}
1381                 }
1382         },
1383         {1, 1, 3, 0,            /* 0xbb */
1384                 {{0, 1},
1385                 {3, 5},
1386                 {7, 7},
1387                 {0, 0}
1388                 }
1389         },
1390         {0, 1, 2, 0,            /* 0xbc */
1391                 {{2, 5},
1392                 {7, 7},
1393                 {0, 0},
1394                 {0, 0}
1395                 }
1396         },
1397         {1, 1, 3, 0,            /* 0xbd */
1398                 {{0, 0},
1399                 {2, 5},
1400                 {7, 7},
1401                 {0, 0}
1402                 }
1403         },
1404         {0, 1, 2, 0,            /* 0xbe */
1405                 {{1, 5},
1406                 {7, 7},
1407                 {0, 0},
1408                 {0, 0}
1409                 }
1410         },
1411         {1, 1, 2, 0,            /* 0xbf */
1412                 {{0, 5},
1413                 {7, 7},
1414                 {0, 0},
1415                 {0, 0}
1416                 }
1417         },
1418         {0, 1, 1, 0,            /* 0xc0 */
1419                 {{6, 7},
1420                 {0, 0},
1421                 {0, 0},
1422                 {0, 0}
1423                 }
1424         },
1425         {1, 1, 2, 0,            /* 0xc1 */
1426                 {{0, 0},
1427                 {6, 7},
1428                 {0, 0},
1429                 {0, 0}
1430                 }
1431         },
1432         {0, 1, 2, 0,            /* 0xc2 */
1433                 {{1, 1},
1434                 {6, 7},
1435                 {0, 0},
1436                 {0, 0}
1437                 }
1438         },
1439         {1, 1, 2, 0,            /* 0xc3 */
1440                 {{0, 1},
1441                 {6, 7},
1442                 {0, 0},
1443                 {0, 0}
1444                 }
1445         },
1446         {0, 1, 2, 0,            /* 0xc4 */
1447                 {{2, 2},
1448                 {6, 7},
1449                 {0, 0},
1450                 {0, 0}
1451                 }
1452         },
1453         {1, 1, 3, 0,            /* 0xc5 */
1454                 {{0, 0},
1455                 {2, 2},
1456                 {6, 7},
1457                 {0, 0}
1458                 }
1459         },
1460         {0, 1, 2, 0,            /* 0xc6 */
1461                 {{1, 2},
1462                 {6, 7},
1463                 {0, 0},
1464                 {0, 0}
1465                 }
1466         },
1467         {1, 1, 2, 0,            /* 0xc7 */
1468                 {{0, 2},
1469                 {6, 7},
1470                 {0, 0},
1471                 {0, 0}
1472                 }
1473         },
1474         {0, 1, 2, 0,            /* 0xc8 */
1475                 {{3, 3},
1476                 {6, 7},
1477                 {0, 0},
1478                 {0, 0}
1479                 }
1480         },
1481         {1, 1, 3, 0,            /* 0xc9 */
1482                 {{0, 0},
1483                 {3, 3},
1484                 {6, 7},
1485                 {0, 0}
1486                 }
1487         },
1488         {0, 1, 3, 0,            /* 0xca */
1489                 {{1, 1},
1490                 {3, 3},
1491                 {6, 7},
1492                 {0, 0}
1493                 }
1494         },
1495         {1, 1, 3, 0,            /* 0xcb */
1496                 {{0, 1},
1497                 {3, 3},
1498                 {6, 7},
1499                 {0, 0}
1500                 }
1501         },
1502         {0, 1, 2, 0,            /* 0xcc */
1503                 {{2, 3},
1504                 {6, 7},
1505                 {0, 0},
1506                 {0, 0}
1507                 }
1508         },
1509         {1, 1, 3, 0,            /* 0xcd */
1510                 {{0, 0},
1511                 {2, 3},
1512                 {6, 7},
1513                 {0, 0}
1514                 }
1515         },
1516         {0, 1, 2, 0,            /* 0xce */
1517                 {{1, 3},
1518                 {6, 7},
1519                 {0, 0},
1520                 {0, 0}
1521                 }
1522         },
1523         {1, 1, 2, 0,            /* 0xcf */
1524                 {{0, 3},
1525                 {6, 7},
1526                 {0, 0},
1527                 {0, 0}
1528                 }
1529         },
1530         {0, 1, 2, 0,            /* 0xd0 */
1531                 {{4, 4},
1532                 {6, 7},
1533                 {0, 0},
1534                 {0, 0}
1535                 }
1536         },
1537         {1, 1, 3, 0,            /* 0xd1 */
1538                 {{0, 0},
1539                 {4, 4},
1540                 {6, 7},
1541                 {0, 0}
1542                 }
1543         },
1544         {0, 1, 3, 0,            /* 0xd2 */
1545                 {{1, 1},
1546                 {4, 4},
1547                 {6, 7},
1548                 {0, 0}
1549                 }
1550         },
1551         {1, 1, 3, 0,            /* 0xd3 */
1552                 {{0, 1},
1553                 {4, 4},
1554                 {6, 7},
1555                 {0, 0}
1556                 }
1557         },
1558         {0, 1, 3, 0,            /* 0xd4 */
1559                 {{2, 2},
1560                 {4, 4},
1561                 {6, 7},
1562                 {0, 0}
1563                 }
1564         },
1565         {1, 1, 4, 0,            /* 0xd5 */
1566                 {{0, 0},
1567                 {2, 2},
1568                 {4, 4},
1569                 {6, 7}
1570                 }
1571         },
1572         {0, 1, 3, 0,            /* 0xd6 */
1573                 {{1, 2},
1574                 {4, 4},
1575                 {6, 7},
1576                 {0, 0}
1577                 }
1578         },
1579         {1, 1, 3, 0,            /* 0xd7 */
1580                 {{0, 2},
1581                 {4, 4},
1582                 {6, 7},
1583                 {0, 0}
1584                 }
1585         },
1586         {0, 1, 2, 0,            /* 0xd8 */
1587                 {{3, 4},
1588                 {6, 7},
1589                 {0, 0},
1590                 {0, 0}
1591                 }
1592         },
1593         {1, 1, 3, 0,            /* 0xd9 */
1594                 {{0, 0},
1595                 {3, 4},
1596                 {6, 7},
1597                 {0, 0}
1598                 }
1599         },
1600         {0, 1, 3, 0,            /* 0xda */
1601                 {{1, 1},
1602                 {3, 4},
1603                 {6, 7},
1604                 {0, 0}
1605                 }
1606         },
1607         {1, 1, 3, 0,            /* 0xdb */
1608                 {{0, 1},
1609                 {3, 4},
1610                 {6, 7},
1611                 {0, 0}
1612                 }
1613         },
1614         {0, 1, 2, 0,            /* 0xdc */
1615                 {{2, 4},
1616                 {6, 7},
1617                 {0, 0},
1618                 {0, 0}
1619                 }
1620         },
1621         {1, 1, 3, 0,            /* 0xdd */
1622                 {{0, 0},
1623                 {2, 4},
1624                 {6, 7},
1625                 {0, 0}
1626                 }
1627         },
1628         {0, 1, 2, 0,            /* 0xde */
1629                 {{1, 4},
1630                 {6, 7},
1631                 {0, 0},
1632                 {0, 0}
1633                 }
1634         },
1635         {1, 1, 2, 0,            /* 0xdf */
1636                 {{0, 4},
1637                 {6, 7},
1638                 {0, 0},
1639                 {0, 0}
1640                 }
1641         },
1642         {0, 1, 1, 0,            /* 0xe0 */
1643                 {{5, 7},
1644                 {0, 0},
1645                 {0, 0},
1646                 {0, 0}
1647                 }
1648         },
1649         {1, 1, 2, 0,            /* 0xe1 */
1650                 {{0, 0},
1651                 {5, 7},
1652                 {0, 0},
1653                 {0, 0}
1654                 }
1655         },
1656         {0, 1, 2, 0,            /* 0xe2 */
1657                 {{1, 1},
1658                 {5, 7},
1659                 {0, 0},
1660                 {0, 0}
1661                 }
1662         },
1663         {1, 1, 2, 0,            /* 0xe3 */
1664                 {{0, 1},
1665                 {5, 7},
1666                 {0, 0},
1667                 {0, 0}
1668                 }
1669         },
1670         {0, 1, 2, 0,            /* 0xe4 */
1671                 {{2, 2},
1672                 {5, 7},
1673                 {0, 0},
1674                 {0, 0}
1675                 }
1676         },
1677         {1, 1, 3, 0,            /* 0xe5 */
1678                 {{0, 0},
1679                 {2, 2},
1680                 {5, 7},
1681                 {0, 0}
1682                 }
1683         },
1684         {0, 1, 2, 0,            /* 0xe6 */
1685                 {{1, 2},
1686                 {5, 7},
1687                 {0, 0},
1688                 {0, 0}
1689                 }
1690         },
1691         {1, 1, 2, 0,            /* 0xe7 */
1692                 {{0, 2},
1693                 {5, 7},
1694                 {0, 0},
1695                 {0, 0}
1696                 }
1697         },
1698         {0, 1, 2, 0,            /* 0xe8 */
1699                 {{3, 3},
1700                 {5, 7},
1701                 {0, 0},
1702                 {0, 0}
1703                 }
1704         },
1705         {1, 1, 3, 0,            /* 0xe9 */
1706                 {{0, 0},
1707                 {3, 3},
1708                 {5, 7},
1709                 {0, 0}
1710                 }
1711         },
1712         {0, 1, 3, 0,            /* 0xea */
1713                 {{1, 1},
1714                 {3, 3},
1715                 {5, 7},
1716                 {0, 0}
1717                 }
1718         },
1719         {1, 1, 3, 0,            /* 0xeb */
1720                 {{0, 1},
1721                 {3, 3},
1722                 {5, 7},
1723                 {0, 0}
1724                 }
1725         },
1726         {0, 1, 2, 0,            /* 0xec */
1727                 {{2, 3},
1728                 {5, 7},
1729                 {0, 0},
1730                 {0, 0}
1731                 }
1732         },
1733         {1, 1, 3, 0,            /* 0xed */
1734                 {{0, 0},
1735                 {2, 3},
1736                 {5, 7},
1737                 {0, 0}
1738                 }
1739         },
1740         {0, 1, 2, 0,            /* 0xee */
1741                 {{1, 3},
1742                 {5, 7},
1743                 {0, 0},
1744                 {0, 0}
1745                 }
1746         },
1747         {1, 1, 2, 0,            /* 0xef */
1748                 {{0, 3},
1749                 {5, 7},
1750                 {0, 0},
1751                 {0, 0}
1752                 }
1753         },
1754         {0, 1, 1, 0,            /* 0xf0 */
1755                 {{4, 7},
1756                 {0, 0},
1757                 {0, 0},
1758                 {0, 0}
1759                 }
1760         },
1761         {1, 1, 2, 0,            /* 0xf1 */
1762                 {{0, 0},
1763                 {4, 7},
1764                 {0, 0},
1765                 {0, 0}
1766                 }
1767         },
1768         {0, 1, 2, 0,            /* 0xf2 */
1769                 {{1, 1},
1770                 {4, 7},
1771                 {0, 0},
1772                 {0, 0}
1773                 }
1774         },
1775         {1, 1, 2, 0,            /* 0xf3 */
1776                 {{0, 1},
1777                 {4, 7},
1778                 {0, 0},
1779                 {0, 0}
1780                 }
1781         },
1782         {0, 1, 2, 0,            /* 0xf4 */
1783                 {{2, 2},
1784                 {4, 7},
1785                 {0, 0},
1786                 {0, 0}
1787                 }
1788         },
1789         {1, 1, 3, 0,            /* 0xf5 */
1790                 {{0, 0},
1791                 {2, 2},
1792                 {4, 7},
1793                 {0, 0}
1794                 }
1795         },
1796         {0, 1, 2, 0,            /* 0xf6 */
1797                 {{1, 2},
1798                 {4, 7},
1799                 {0, 0},
1800                 {0, 0}
1801                 }
1802         },
1803         {1, 1, 2, 0,            /* 0xf7 */
1804                 {{0, 2},
1805                 {4, 7},
1806                 {0, 0},
1807                 {0, 0}
1808                 }
1809         },
1810         {0, 1, 1, 0,            /* 0xf8 */
1811                 {{3, 7},
1812                 {0, 0},
1813                 {0, 0},
1814                 {0, 0}
1815                 }
1816         },
1817         {1, 1, 2, 0,            /* 0xf9 */
1818                 {{0, 0},
1819                 {3, 7},
1820                 {0, 0},
1821                 {0, 0}
1822                 }
1823         },
1824         {0, 1, 2, 0,            /* 0xfa */
1825                 {{1, 1},
1826                 {3, 7},
1827                 {0, 0},
1828                 {0, 0}
1829                 }
1830         },
1831         {1, 1, 2, 0,            /* 0xfb */
1832                 {{0, 1},
1833                 {3, 7},
1834                 {0, 0},
1835                 {0, 0}
1836                 }
1837         },
1838         {0, 1, 1, 0,            /* 0xfc */
1839                 {{2, 7},
1840                 {0, 0},
1841                 {0, 0},
1842                 {0, 0}
1843                 }
1844         },
1845         {1, 1, 2, 0,            /* 0xfd */
1846                 {{0, 0},
1847                 {2, 7},
1848                 {0, 0},
1849                 {0, 0}
1850                 }
1851         },
1852         {0, 1, 1, 0,            /* 0xfe */
1853                 {{1, 7},
1854                 {0, 0},
1855                 {0, 0},
1856                 {0, 0}
1857                 }
1858         },
1859         {1, 1, 1, 0,            /* 0xff */
1860                 {{0, 7},
1861                 {0, 0},
1862                 {0, 0},
1863                 {0, 0}
1864                 }
1865         }
1866 };
1867
1868
1869 int
1870 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1871     struct sctp_scoping *scope,
1872     int do_update)
1873 {
1874         if ((scope->loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (scope->ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = &ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((scope->ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (scope->ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = &ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((scope->site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1944 {
1945 #if defined(INET) || defined(INET6)
1946         struct sctp_paramhdr *paramh;
1947         struct mbuf *mret;
1948         uint16_t plen;
1949 #endif
1950
1951         switch (ifa->address.sa.sa_family) {
1952 #ifdef INET
1953         case AF_INET:
1954                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1955                 break;
1956 #endif
1957 #ifdef INET6
1958         case AF_INET6:
1959                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1960                 break;
1961 #endif
1962         default:
1963                 return (m);
1964         }
1965 #if defined(INET) || defined(INET6)
1966         if (M_TRAILINGSPACE(m) >= plen) {
1967                 /* easy side we just drop it on the end */
1968                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1969                 mret = m;
1970         } else {
1971                 /* Need more space */
1972                 mret = m;
1973                 while (SCTP_BUF_NEXT(mret) != NULL) {
1974                         mret = SCTP_BUF_NEXT(mret);
1975                 }
1976                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1977                 if (SCTP_BUF_NEXT(mret) == NULL) {
1978                         /* We are hosed, can't add more addresses */
1979                         return (m);
1980                 }
1981                 mret = SCTP_BUF_NEXT(mret);
1982                 paramh = mtod(mret, struct sctp_paramhdr *);
1983         }
1984         /* now add the parameter */
1985         switch (ifa->address.sa.sa_family) {
1986 #ifdef INET
1987         case AF_INET:
1988                 {
1989                         struct sctp_ipv4addr_param *ipv4p;
1990                         struct sockaddr_in *sin;
1991
1992                         sin = &ifa->address.sin;
1993                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
1994                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1995                         paramh->param_length = htons(plen);
1996                         ipv4p->addr = sin->sin_addr.s_addr;
1997                         SCTP_BUF_LEN(mret) += plen;
1998                         break;
1999                 }
2000 #endif
2001 #ifdef INET6
2002         case AF_INET6:
2003                 {
2004                         struct sctp_ipv6addr_param *ipv6p;
2005                         struct sockaddr_in6 *sin6;
2006
2007                         sin6 = &ifa->address.sin6;
2008                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
2009                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2010                         paramh->param_length = htons(plen);
2011                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2012                             sizeof(ipv6p->addr));
2013                         /* clear embedded scope in the address */
2014                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2015                         SCTP_BUF_LEN(mret) += plen;
2016                         break;
2017                 }
2018 #endif
2019         default:
2020                 return (m);
2021         }
2022         if (len != NULL) {
2023                 *len += plen;
2024         }
2025         return (mret);
2026 #endif
2027 }
2028
2029
2030 struct mbuf *
2031 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2032     struct sctp_scoping *scope,
2033     struct mbuf *m_at, int cnt_inits_to,
2034     uint16_t *padding_len, uint16_t *chunk_len)
2035 {
2036         struct sctp_vrf *vrf = NULL;
2037         int cnt, limit_out = 0, total_count;
2038         uint32_t vrf_id;
2039
2040         vrf_id = inp->def_vrf_id;
2041         SCTP_IPI_ADDR_RLOCK();
2042         vrf = sctp_find_vrf(vrf_id);
2043         if (vrf == NULL) {
2044                 SCTP_IPI_ADDR_RUNLOCK();
2045                 return (m_at);
2046         }
2047         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2048                 struct sctp_ifa *sctp_ifap;
2049                 struct sctp_ifn *sctp_ifnp;
2050
2051                 cnt = cnt_inits_to;
2052                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2053                         limit_out = 1;
2054                         cnt = SCTP_ADDRESS_LIMIT;
2055                         goto skip_count;
2056                 }
2057                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2058                         if ((scope->loopback_scope == 0) &&
2059                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2060                                 /*
2061                                  * Skip loopback devices if loopback_scope
2062                                  * not set
2063                                  */
2064                                 continue;
2065                         }
2066                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2067 #ifdef INET
2068                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2069                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2070                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2071                                         continue;
2072                                 }
2073 #endif
2074 #ifdef INET6
2075                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2076                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2077                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2078                                         continue;
2079                                 }
2080 #endif
2081                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2082                                         continue;
2083                                 }
2084                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2085                                         continue;
2086                                 }
2087                                 cnt++;
2088                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2089                                         break;
2090                                 }
2091                         }
2092                         if (cnt > SCTP_ADDRESS_LIMIT) {
2093                                 break;
2094                         }
2095                 }
2096 skip_count:
2097                 if (cnt > 1) {
2098                         total_count = 0;
2099                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2100                                 cnt = 0;
2101                                 if ((scope->loopback_scope == 0) &&
2102                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2103                                         /*
2104                                          * Skip loopback devices if
2105                                          * loopback_scope not set
2106                                          */
2107                                         continue;
2108                                 }
2109                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2110 #ifdef INET
2111                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2112                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2113                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2114                                                 continue;
2115                                         }
2116 #endif
2117 #ifdef INET6
2118                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2119                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2120                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2121                                                 continue;
2122                                         }
2123 #endif
2124                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2125                                                 continue;
2126                                         }
2127                                         if (sctp_is_address_in_scope(sctp_ifap,
2128                                             scope, 0) == 0) {
2129                                                 continue;
2130                                         }
2131                                         if ((chunk_len != NULL) &&
2132                                             (padding_len != NULL) &&
2133                                             (*padding_len > 0)) {
2134                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2135                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2136                                                 *chunk_len += *padding_len;
2137                                                 *padding_len = 0;
2138                                         }
2139                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2140                                         if (limit_out) {
2141                                                 cnt++;
2142                                                 total_count++;
2143                                                 if (cnt >= 2) {
2144                                                         /*
2145                                                          * two from each
2146                                                          * address
2147                                                          */
2148                                                         break;
2149                                                 }
2150                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2151                                                         /* No more addresses */
2152                                                         break;
2153                                                 }
2154                                         }
2155                                 }
2156                         }
2157                 }
2158         } else {
2159                 struct sctp_laddr *laddr;
2160
2161                 cnt = cnt_inits_to;
2162                 /* First, how many ? */
2163                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2164                         if (laddr->ifa == NULL) {
2165                                 continue;
2166                         }
2167                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2168                                 /*
2169                                  * Address being deleted by the system, dont
2170                                  * list.
2171                                  */
2172                                 continue;
2173                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2174                                 /*
2175                                  * Address being deleted on this ep don't
2176                                  * list.
2177                                  */
2178                                 continue;
2179                         }
2180                         if (sctp_is_address_in_scope(laddr->ifa,
2181                             scope, 1) == 0) {
2182                                 continue;
2183                         }
2184                         cnt++;
2185                 }
2186                 /*
2187                  * To get through a NAT we only list addresses if we have
2188                  * more than one. That way if you just bind a single address
2189                  * we let the source of the init dictate our address.
2190                  */
2191                 if (cnt > 1) {
2192                         cnt = cnt_inits_to;
2193                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2194                                 if (laddr->ifa == NULL) {
2195                                         continue;
2196                                 }
2197                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2198                                         continue;
2199                                 }
2200                                 if (sctp_is_address_in_scope(laddr->ifa,
2201                                     scope, 0) == 0) {
2202                                         continue;
2203                                 }
2204                                 if ((chunk_len != NULL) &&
2205                                     (padding_len != NULL) &&
2206                                     (*padding_len > 0)) {
2207                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2208                                         SCTP_BUF_LEN(m_at) += *padding_len;
2209                                         *chunk_len += *padding_len;
2210                                         *padding_len = 0;
2211                                 }
2212                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2213                                 cnt++;
2214                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2215                                         break;
2216                                 }
2217                         }
2218                 }
2219         }
2220         SCTP_IPI_ADDR_RUNLOCK();
2221         return (m_at);
2222 }
2223
2224 static struct sctp_ifa *
2225 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2226     uint8_t dest_is_loop,
2227     uint8_t dest_is_priv,
2228     sa_family_t fam)
2229 {
2230         uint8_t dest_is_global = 0;
2231
2232         /* dest_is_priv is true if destination is a private address */
2233         /* dest_is_loop is true if destination is a loopback addresses */
2234
2235         /**
2236          * Here we determine if its a preferred address. A preferred address
2237          * means it is the same scope or higher scope then the destination.
2238          * L = loopback, P = private, G = global
2239          * -----------------------------------------
2240          *    src    |  dest | result
2241          *  ----------------------------------------
2242          *     L     |    L  |    yes
2243          *  -----------------------------------------
2244          *     P     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     G     |    L  |    yes-v4 no-v6
2247          *  -----------------------------------------
2248          *     L     |    P  |    no
2249          *  -----------------------------------------
2250          *     P     |    P  |    yes
2251          *  -----------------------------------------
2252          *     G     |    P  |    no
2253          *   -----------------------------------------
2254          *     L     |    G  |    no
2255          *   -----------------------------------------
2256          *     P     |    G  |    no
2257          *    -----------------------------------------
2258          *     G     |    G  |    yes
2259          *    -----------------------------------------
2260          */
2261
2262         if (ifa->address.sa.sa_family != fam) {
2263                 /* forget mis-matched family */
2264                 return (NULL);
2265         }
2266         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2267                 dest_is_global = 1;
2268         }
2269         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2270         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2271         /* Ok the address may be ok */
2272 #ifdef INET6
2273         if (fam == AF_INET6) {
2274                 /* ok to use deprecated addresses? no lets not! */
2275                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2276                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2277                         return (NULL);
2278                 }
2279                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2280                         if (dest_is_loop) {
2281                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2282                                 return (NULL);
2283                         }
2284                 }
2285                 if (ifa->src_is_glob) {
2286                         if (dest_is_loop) {
2287                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2288                                 return (NULL);
2289                         }
2290                 }
2291         }
2292 #endif
2293         /*
2294          * Now that we know what is what, implement or table this could in
2295          * theory be done slicker (it used to be), but this is
2296          * straightforward and easier to validate :-)
2297          */
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2299             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2300         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2301             dest_is_loop, dest_is_priv, dest_is_global);
2302
2303         if ((ifa->src_is_loop) && (dest_is_priv)) {
2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2305                 return (NULL);
2306         }
2307         if ((ifa->src_is_glob) && (dest_is_priv)) {
2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2309                 return (NULL);
2310         }
2311         if ((ifa->src_is_loop) && (dest_is_global)) {
2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2313                 return (NULL);
2314         }
2315         if ((ifa->src_is_priv) && (dest_is_global)) {
2316                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2317                 return (NULL);
2318         }
2319         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2320         /* its a preferred address */
2321         return (ifa);
2322 }
2323
2324 static struct sctp_ifa *
2325 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2326     uint8_t dest_is_loop,
2327     uint8_t dest_is_priv,
2328     sa_family_t fam)
2329 {
2330         uint8_t dest_is_global = 0;
2331
2332         /**
2333          * Here we determine if its a acceptable address. A acceptable
2334          * address means it is the same scope or higher scope but we can
2335          * allow for NAT which means its ok to have a global dest and a
2336          * private src.
2337          *
2338          * L = loopback, P = private, G = global
2339          * -----------------------------------------
2340          *  src    |  dest | result
2341          * -----------------------------------------
2342          *   L     |   L   |    yes
2343          *  -----------------------------------------
2344          *   P     |   L   |    yes-v4 no-v6
2345          *  -----------------------------------------
2346          *   G     |   L   |    yes
2347          * -----------------------------------------
2348          *   L     |   P   |    no
2349          * -----------------------------------------
2350          *   P     |   P   |    yes
2351          * -----------------------------------------
2352          *   G     |   P   |    yes - May not work
2353          * -----------------------------------------
2354          *   L     |   G   |    no
2355          * -----------------------------------------
2356          *   P     |   G   |    yes - May not work
2357          * -----------------------------------------
2358          *   G     |   G   |    yes
2359          * -----------------------------------------
2360          */
2361
2362         if (ifa->address.sa.sa_family != fam) {
2363                 /* forget non matching family */
2364                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2365                     ifa->address.sa.sa_family, fam);
2366                 return (NULL);
2367         }
2368         /* Ok the address may be ok */
2369         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2370         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2371             dest_is_loop, dest_is_priv);
2372         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2373                 dest_is_global = 1;
2374         }
2375 #ifdef INET6
2376         if (fam == AF_INET6) {
2377                 /* ok to use deprecated addresses? */
2378                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2379                         return (NULL);
2380                 }
2381                 if (ifa->src_is_priv) {
2382                         /* Special case, linklocal to loop */
2383                         if (dest_is_loop)
2384                                 return (NULL);
2385                 }
2386         }
2387 #endif
2388         /*
2389          * Now that we know what is what, implement our table. This could in
2390          * theory be done slicker (it used to be), but this is
2391          * straightforward and easier to validate :-)
2392          */
2393         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2394             ifa->src_is_loop,
2395             dest_is_priv);
2396         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2397                 return (NULL);
2398         }
2399         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2400             ifa->src_is_loop,
2401             dest_is_global);
2402         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2403                 return (NULL);
2404         }
2405         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2406         /* its an acceptable address */
2407         return (ifa);
2408 }
2409
2410 int
2411 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2412 {
2413         struct sctp_laddr *laddr;
2414
2415         if (stcb == NULL) {
2416                 /* There are no restrictions, no TCB :-) */
2417                 return (0);
2418         }
2419         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2420                 if (laddr->ifa == NULL) {
2421                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2422                             __func__);
2423                         continue;
2424                 }
2425                 if (laddr->ifa == ifa) {
2426                         /* Yes it is on the list */
2427                         return (1);
2428                 }
2429         }
2430         return (0);
2431 }
2432
2433
2434 int
2435 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2436 {
2437         struct sctp_laddr *laddr;
2438
2439         if (ifa == NULL)
2440                 return (0);
2441         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2442                 if (laddr->ifa == NULL) {
2443                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2444                             __func__);
2445                         continue;
2446                 }
2447                 if ((laddr->ifa == ifa) && laddr->action == 0)
2448                         /* same pointer */
2449                         return (1);
2450         }
2451         return (0);
2452 }
2453
2454
2455
2456 static struct sctp_ifa *
2457 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2458     sctp_route_t *ro,
2459     uint32_t vrf_id,
2460     int non_asoc_addr_ok,
2461     uint8_t dest_is_priv,
2462     uint8_t dest_is_loop,
2463     sa_family_t fam)
2464 {
2465         struct sctp_laddr *laddr, *starting_point;
2466         void *ifn;
2467         int resettotop = 0;
2468         struct sctp_ifn *sctp_ifn;
2469         struct sctp_ifa *sctp_ifa, *sifa;
2470         struct sctp_vrf *vrf;
2471         uint32_t ifn_index;
2472
2473         vrf = sctp_find_vrf(vrf_id);
2474         if (vrf == NULL)
2475                 return (NULL);
2476
2477         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2478         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2479         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2480         /*
2481          * first question, is the ifn we will emit on in our list, if so, we
2482          * want such an address. Note that we first looked for a preferred
2483          * address.
2484          */
2485         if (sctp_ifn) {
2486                 /* is a preferred one on the interface we route out? */
2487                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2488 #ifdef INET
2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2490                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2491                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2492                                 continue;
2493                         }
2494 #endif
2495 #ifdef INET6
2496                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2497                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2498                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2499                                 continue;
2500                         }
2501 #endif
2502                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2503                             (non_asoc_addr_ok == 0))
2504                                 continue;
2505                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2506                             dest_is_loop,
2507                             dest_is_priv, fam);
2508                         if (sifa == NULL)
2509                                 continue;
2510                         if (sctp_is_addr_in_ep(inp, sifa)) {
2511                                 atomic_add_int(&sifa->refcount, 1);
2512                                 return (sifa);
2513                         }
2514                 }
2515         }
2516         /*
2517          * ok, now we now need to find one on the list of the addresses. We
2518          * can't get one on the emitting interface so let's find first a
2519          * preferred one. If not that an acceptable one otherwise... we
2520          * return NULL.
2521          */
2522         starting_point = inp->next_addr_touse;
2523 once_again:
2524         if (inp->next_addr_touse == NULL) {
2525                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2526                 resettotop = 1;
2527         }
2528         for (laddr = inp->next_addr_touse; laddr;
2529             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2530                 if (laddr->ifa == NULL) {
2531                         /* address has been removed */
2532                         continue;
2533                 }
2534                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2535                         /* address is being deleted */
2536                         continue;
2537                 }
2538                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2539                     dest_is_priv, fam);
2540                 if (sifa == NULL)
2541                         continue;
2542                 atomic_add_int(&sifa->refcount, 1);
2543                 return (sifa);
2544         }
2545         if (resettotop == 0) {
2546                 inp->next_addr_touse = NULL;
2547                 goto once_again;
2548         }
2549
2550         inp->next_addr_touse = starting_point;
2551         resettotop = 0;
2552 once_again_too:
2553         if (inp->next_addr_touse == NULL) {
2554                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2555                 resettotop = 1;
2556         }
2557
2558         /* ok, what about an acceptable address in the inp */
2559         for (laddr = inp->next_addr_touse; laddr;
2560             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2561                 if (laddr->ifa == NULL) {
2562                         /* address has been removed */
2563                         continue;
2564                 }
2565                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2566                         /* address is being deleted */
2567                         continue;
2568                 }
2569                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2570                     dest_is_priv, fam);
2571                 if (sifa == NULL)
2572                         continue;
2573                 atomic_add_int(&sifa->refcount, 1);
2574                 return (sifa);
2575         }
2576         if (resettotop == 0) {
2577                 inp->next_addr_touse = NULL;
2578                 goto once_again_too;
2579         }
2580
2581         /*
2582          * no address bound can be a source for the destination we are in
2583          * trouble
2584          */
2585         return (NULL);
2586 }
2587
2588
2589
2590 static struct sctp_ifa *
2591 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2592     struct sctp_tcb *stcb,
2593     sctp_route_t *ro,
2594     uint32_t vrf_id,
2595     uint8_t dest_is_priv,
2596     uint8_t dest_is_loop,
2597     int non_asoc_addr_ok,
2598     sa_family_t fam)
2599 {
2600         struct sctp_laddr *laddr, *starting_point;
2601         void *ifn;
2602         struct sctp_ifn *sctp_ifn;
2603         struct sctp_ifa *sctp_ifa, *sifa;
2604         uint8_t start_at_beginning = 0;
2605         struct sctp_vrf *vrf;
2606         uint32_t ifn_index;
2607
2608         /*
2609          * first question, is the ifn we will emit on in our list, if so, we
2610          * want that one.
2611          */
2612         vrf = sctp_find_vrf(vrf_id);
2613         if (vrf == NULL)
2614                 return (NULL);
2615
2616         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2617         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2618         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2619
2620         /*
2621          * first question, is the ifn we will emit on in our list?  If so,
2622          * we want that one. First we look for a preferred. Second, we go
2623          * for an acceptable.
2624          */
2625         if (sctp_ifn) {
2626                 /* first try for a preferred address on the ep */
2627                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2628 #ifdef INET
2629                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2630                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2631                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2632                                 continue;
2633                         }
2634 #endif
2635 #ifdef INET6
2636                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2637                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2638                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2639                                 continue;
2640                         }
2641 #endif
2642                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2643                                 continue;
2644                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2645                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2646                                 if (sifa == NULL)
2647                                         continue;
2648                                 if (((non_asoc_addr_ok == 0) &&
2649                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2650                                     (non_asoc_addr_ok &&
2651                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2652                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2653                                         /* on the no-no list */
2654                                         continue;
2655                                 }
2656                                 atomic_add_int(&sifa->refcount, 1);
2657                                 return (sifa);
2658                         }
2659                 }
2660                 /* next try for an acceptable address on the ep */
2661                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2662 #ifdef INET
2663                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2664                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2665                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2666                                 continue;
2667                         }
2668 #endif
2669 #ifdef INET6
2670                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2671                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2672                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2673                                 continue;
2674                         }
2675 #endif
2676                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2677                                 continue;
2678                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2679                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2680                                 if (sifa == NULL)
2681                                         continue;
2682                                 if (((non_asoc_addr_ok == 0) &&
2683                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2684                                     (non_asoc_addr_ok &&
2685                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2686                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2687                                         /* on the no-no list */
2688                                         continue;
2689                                 }
2690                                 atomic_add_int(&sifa->refcount, 1);
2691                                 return (sifa);
2692                         }
2693                 }
2694
2695         }
2696         /*
2697          * if we can't find one like that then we must look at all addresses
2698          * bound to pick one at first preferable then secondly acceptable.
2699          */
2700         starting_point = stcb->asoc.last_used_address;
2701 sctp_from_the_top:
2702         if (stcb->asoc.last_used_address == NULL) {
2703                 start_at_beginning = 1;
2704                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2705         }
2706         /* search beginning with the last used address */
2707         for (laddr = stcb->asoc.last_used_address; laddr;
2708             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2709                 if (laddr->ifa == NULL) {
2710                         /* address has been removed */
2711                         continue;
2712                 }
2713                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2714                         /* address is being deleted */
2715                         continue;
2716                 }
2717                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2718                 if (sifa == NULL)
2719                         continue;
2720                 if (((non_asoc_addr_ok == 0) &&
2721                     (sctp_is_addr_restricted(stcb, sifa))) ||
2722                     (non_asoc_addr_ok &&
2723                     (sctp_is_addr_restricted(stcb, sifa)) &&
2724                     (!sctp_is_addr_pending(stcb, sifa)))) {
2725                         /* on the no-no list */
2726                         continue;
2727                 }
2728                 stcb->asoc.last_used_address = laddr;
2729                 atomic_add_int(&sifa->refcount, 1);
2730                 return (sifa);
2731         }
2732         if (start_at_beginning == 0) {
2733                 stcb->asoc.last_used_address = NULL;
2734                 goto sctp_from_the_top;
2735         }
2736         /* now try for any higher scope than the destination */
2737         stcb->asoc.last_used_address = starting_point;
2738         start_at_beginning = 0;
2739 sctp_from_the_top2:
2740         if (stcb->asoc.last_used_address == NULL) {
2741                 start_at_beginning = 1;
2742                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2743         }
2744         /* search beginning with the last used address */
2745         for (laddr = stcb->asoc.last_used_address; laddr;
2746             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2747                 if (laddr->ifa == NULL) {
2748                         /* address has been removed */
2749                         continue;
2750                 }
2751                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2752                         /* address is being deleted */
2753                         continue;
2754                 }
2755                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2756                     dest_is_priv, fam);
2757                 if (sifa == NULL)
2758                         continue;
2759                 if (((non_asoc_addr_ok == 0) &&
2760                     (sctp_is_addr_restricted(stcb, sifa))) ||
2761                     (non_asoc_addr_ok &&
2762                     (sctp_is_addr_restricted(stcb, sifa)) &&
2763                     (!sctp_is_addr_pending(stcb, sifa)))) {
2764                         /* on the no-no list */
2765                         continue;
2766                 }
2767                 stcb->asoc.last_used_address = laddr;
2768                 atomic_add_int(&sifa->refcount, 1);
2769                 return (sifa);
2770         }
2771         if (start_at_beginning == 0) {
2772                 stcb->asoc.last_used_address = NULL;
2773                 goto sctp_from_the_top2;
2774         }
2775         return (NULL);
2776 }
2777
2778 static struct sctp_ifa *
2779 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2780     struct sctp_inpcb *inp,
2781     struct sctp_tcb *stcb,
2782     int non_asoc_addr_ok,
2783     uint8_t dest_is_loop,
2784     uint8_t dest_is_priv,
2785     int addr_wanted,
2786     sa_family_t fam,
2787     sctp_route_t *ro
2788 )
2789 {
2790         struct sctp_ifa *ifa, *sifa;
2791         int num_eligible_addr = 0;
2792 #ifdef INET6
2793         struct sockaddr_in6 sin6, lsa6;
2794
2795         if (fam == AF_INET6) {
2796                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2797                 (void)sa6_recoverscope(&sin6);
2798         }
2799 #endif                          /* INET6 */
2800         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2801 #ifdef INET
2802                 if ((ifa->address.sa.sa_family == AF_INET) &&
2803                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2804                     &ifa->address.sin.sin_addr) != 0)) {
2805                         continue;
2806                 }
2807 #endif
2808 #ifdef INET6
2809                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2810                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2811                     &ifa->address.sin6.sin6_addr) != 0)) {
2812                         continue;
2813                 }
2814 #endif
2815                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2816                     (non_asoc_addr_ok == 0))
2817                         continue;
2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819                     dest_is_priv, fam);
2820                 if (sifa == NULL)
2821                         continue;
2822 #ifdef INET6
2823                 if (fam == AF_INET6 &&
2824                     dest_is_loop &&
2825                     sifa->src_is_loop && sifa->src_is_priv) {
2826                         /*
2827                          * don't allow fe80::1 to be a src on loop ::1, we
2828                          * don't list it to the peer so we will get an
2829                          * abort.
2830                          */
2831                         continue;
2832                 }
2833                 if (fam == AF_INET6 &&
2834                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2835                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2836                         /*
2837                          * link-local <-> link-local must belong to the same
2838                          * scope.
2839                          */
2840                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2841                         (void)sa6_recoverscope(&lsa6);
2842                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2843                                 continue;
2844                         }
2845                 }
2846 #endif                          /* INET6 */
2847
2848                 /*
2849                  * Check if the IPv6 address matches to next-hop. In the
2850                  * mobile case, old IPv6 address may be not deleted from the
2851                  * interface. Then, the interface has previous and new
2852                  * addresses.  We should use one corresponding to the
2853                  * next-hop.  (by micchie)
2854                  */
2855 #ifdef INET6
2856                 if (stcb && fam == AF_INET6 &&
2857                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2858                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2859                             == 0) {
2860                                 continue;
2861                         }
2862                 }
2863 #endif
2864 #ifdef INET
2865                 /* Avoid topologically incorrect IPv4 address */
2866                 if (stcb && fam == AF_INET &&
2867                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2868                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2869                                 continue;
2870                         }
2871                 }
2872 #endif
2873                 if (stcb) {
2874                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2875                                 continue;
2876                         }
2877                         if (((non_asoc_addr_ok == 0) &&
2878                             (sctp_is_addr_restricted(stcb, sifa))) ||
2879                             (non_asoc_addr_ok &&
2880                             (sctp_is_addr_restricted(stcb, sifa)) &&
2881                             (!sctp_is_addr_pending(stcb, sifa)))) {
2882                                 /*
2883                                  * It is restricted for some reason..
2884                                  * probably not yet added.
2885                                  */
2886                                 continue;
2887                         }
2888                 }
2889                 if (num_eligible_addr >= addr_wanted) {
2890                         return (sifa);
2891                 }
2892                 num_eligible_addr++;
2893         }
2894         return (NULL);
2895 }
2896
2897
2898 static int
2899 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2900     struct sctp_inpcb *inp,
2901     struct sctp_tcb *stcb,
2902     int non_asoc_addr_ok,
2903     uint8_t dest_is_loop,
2904     uint8_t dest_is_priv,
2905     sa_family_t fam)
2906 {
2907         struct sctp_ifa *ifa, *sifa;
2908         int num_eligible_addr = 0;
2909
2910         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2911 #ifdef INET
2912                 if ((ifa->address.sa.sa_family == AF_INET) &&
2913                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2914                     &ifa->address.sin.sin_addr) != 0)) {
2915                         continue;
2916                 }
2917 #endif
2918 #ifdef INET6
2919                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2920                     (stcb != NULL) &&
2921                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2922                     &ifa->address.sin6.sin6_addr) != 0)) {
2923                         continue;
2924                 }
2925 #endif
2926                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2927                     (non_asoc_addr_ok == 0)) {
2928                         continue;
2929                 }
2930                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2931                     dest_is_priv, fam);
2932                 if (sifa == NULL) {
2933                         continue;
2934                 }
2935                 if (stcb) {
2936                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2937                                 continue;
2938                         }
2939                         if (((non_asoc_addr_ok == 0) &&
2940                             (sctp_is_addr_restricted(stcb, sifa))) ||
2941                             (non_asoc_addr_ok &&
2942                             (sctp_is_addr_restricted(stcb, sifa)) &&
2943                             (!sctp_is_addr_pending(stcb, sifa)))) {
2944                                 /*
2945                                  * It is restricted for some reason..
2946                                  * probably not yet added.
2947                                  */
2948                                 continue;
2949                         }
2950                 }
2951                 num_eligible_addr++;
2952         }
2953         return (num_eligible_addr);
2954 }
2955
2956 static struct sctp_ifa *
2957 sctp_choose_boundall(struct sctp_inpcb *inp,
2958     struct sctp_tcb *stcb,
2959     struct sctp_nets *net,
2960     sctp_route_t *ro,
2961     uint32_t vrf_id,
2962     uint8_t dest_is_priv,
2963     uint8_t dest_is_loop,
2964     int non_asoc_addr_ok,
2965     sa_family_t fam)
2966 {
2967         int cur_addr_num = 0, num_preferred = 0;
2968         void *ifn;
2969         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2970         struct sctp_ifa *sctp_ifa, *sifa;
2971         uint32_t ifn_index;
2972         struct sctp_vrf *vrf;
2973 #ifdef INET
2974         int retried = 0;
2975 #endif
2976
2977         /*-
2978          * For boundall we can use any address in the association.
2979          * If non_asoc_addr_ok is set we can use any address (at least in
2980          * theory). So we look for preferred addresses first. If we find one,
2981          * we use it. Otherwise we next try to get an address on the
2982          * interface, which we should be able to do (unless non_asoc_addr_ok
2983          * is false and we are routed out that way). In these cases where we
2984          * can't use the address of the interface we go through all the
2985          * ifn's looking for an address we can use and fill that in. Punting
2986          * means we send back address 0, which will probably cause problems
2987          * actually since then IP will fill in the address of the route ifn,
2988          * which means we probably already rejected it.. i.e. here comes an
2989          * abort :-<.
2990          */
2991         vrf = sctp_find_vrf(vrf_id);
2992         if (vrf == NULL)
2993                 return (NULL);
2994
2995         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2996         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2997         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2998         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2999         if (sctp_ifn == NULL) {
3000                 /* ?? We don't have this guy ?? */
3001                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3002                 goto bound_all_plan_b;
3003         }
3004         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3005             ifn_index, sctp_ifn->ifn_name);
3006
3007         if (net) {
3008                 cur_addr_num = net->indx_of_eligible_next_to_use;
3009         }
3010         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3011             inp, stcb,
3012             non_asoc_addr_ok,
3013             dest_is_loop,
3014             dest_is_priv, fam);
3015         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3016             num_preferred, sctp_ifn->ifn_name);
3017         if (num_preferred == 0) {
3018                 /*
3019                  * no eligible addresses, we must use some other interface
3020                  * address if we can find one.
3021                  */
3022                 goto bound_all_plan_b;
3023         }
3024         /*
3025          * Ok we have num_eligible_addr set with how many we can use, this
3026          * may vary from call to call due to addresses being deprecated
3027          * etc..
3028          */
3029         if (cur_addr_num >= num_preferred) {
3030                 cur_addr_num = 0;
3031         }
3032         /*
3033          * select the nth address from the list (where cur_addr_num is the
3034          * nth) and 0 is the first one, 1 is the second one etc...
3035          */
3036         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3037
3038         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3039             dest_is_priv, cur_addr_num, fam, ro);
3040
3041         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3042         if (sctp_ifa) {
3043                 atomic_add_int(&sctp_ifa->refcount, 1);
3044                 if (net) {
3045                         /* save off where the next one we will want */
3046                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3047                 }
3048                 return (sctp_ifa);
3049         }
3050         /*
3051          * plan_b: Look at all interfaces and find a preferred address. If
3052          * no preferred fall through to plan_c.
3053          */
3054 bound_all_plan_b:
3055         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3056         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3057                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3058                     sctp_ifn->ifn_name);
3059                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3060                         /* wrong base scope */
3061                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3062                         continue;
3063                 }
3064                 if ((sctp_ifn == looked_at) && looked_at) {
3065                         /* already looked at this guy */
3066                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3067                         continue;
3068                 }
3069                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3070                     dest_is_loop, dest_is_priv, fam);
3071                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3072                     "Found ifn:%p %d preferred source addresses\n",
3073                     ifn, num_preferred);
3074                 if (num_preferred == 0) {
3075                         /* None on this interface. */
3076                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3077                         continue;
3078                 }
3079                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3080                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3081                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3082
3083                 /*
3084                  * Ok we have num_eligible_addr set with how many we can
3085                  * use, this may vary from call to call due to addresses
3086                  * being deprecated etc..
3087                  */
3088                 if (cur_addr_num >= num_preferred) {
3089                         cur_addr_num = 0;
3090                 }
3091                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3092                     dest_is_priv, cur_addr_num, fam, ro);
3093                 if (sifa == NULL)
3094                         continue;
3095                 if (net) {
3096                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3098                             cur_addr_num);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3101                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3102                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3103                 }
3104                 atomic_add_int(&sifa->refcount, 1);
3105                 return (sifa);
3106         }
3107 #ifdef INET
3108 again_with_private_addresses_allowed:
3109 #endif
3110         /* plan_c: do we have an acceptable address on the emit interface */
3111         sifa = NULL;
3112         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3113         if (emit_ifn == NULL) {
3114                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3115                 goto plan_d;
3116         }
3117         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3118                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3119 #ifdef INET
3120                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3121                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3122                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3123                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3124                         continue;
3125                 }
3126 #endif
3127 #ifdef INET6
3128                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3129                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3130                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3132                         continue;
3133                 }
3134 #endif
3135                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3136                     (non_asoc_addr_ok == 0)) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3138                         continue;
3139                 }
3140                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3141                     dest_is_priv, fam);
3142                 if (sifa == NULL) {
3143                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3144                         continue;
3145                 }
3146                 if (stcb) {
3147                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3148                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3149                                 sifa = NULL;
3150                                 continue;
3151                         }
3152                         if (((non_asoc_addr_ok == 0) &&
3153                             (sctp_is_addr_restricted(stcb, sifa))) ||
3154                             (non_asoc_addr_ok &&
3155                             (sctp_is_addr_restricted(stcb, sifa)) &&
3156                             (!sctp_is_addr_pending(stcb, sifa)))) {
3157                                 /*
3158                                  * It is restricted for some reason..
3159                                  * probably not yet added.
3160                                  */
3161                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3162                                 sifa = NULL;
3163                                 continue;
3164                         }
3165                 }
3166                 atomic_add_int(&sifa->refcount, 1);
3167                 goto out;
3168         }
3169 plan_d:
3170         /*
3171          * plan_d: We are in trouble. No preferred address on the emit
3172          * interface. And not even a preferred address on all interfaces. Go
3173          * out and see if we can find an acceptable address somewhere
3174          * amongst all interfaces.
3175          */
3176         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179                         /* wrong base scope */
3180                         continue;
3181                 }
3182                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183 #ifdef INET
3184                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3187                                 continue;
3188                         }
3189 #endif
3190 #ifdef INET6
3191                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194                                 continue;
3195                         }
3196 #endif
3197                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198                             (non_asoc_addr_ok == 0))
3199                                 continue;
3200                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201                             dest_is_loop,
3202                             dest_is_priv, fam);
3203                         if (sifa == NULL)
3204                                 continue;
3205                         if (stcb) {
3206                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207                                         sifa = NULL;
3208                                         continue;
3209                                 }
3210                                 if (((non_asoc_addr_ok == 0) &&
3211                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3212                                     (non_asoc_addr_ok &&
3213                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3214                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3215                                         /*
3216                                          * It is restricted for some
3217                                          * reason.. probably not yet added.
3218                                          */
3219                                         sifa = NULL;
3220                                         continue;
3221                                 }
3222                         }
3223                         goto out;
3224                 }
3225         }
3226 #ifdef INET
3227         if (stcb) {
3228                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3229                         stcb->asoc.scope.ipv4_local_scope = 1;
3230                         retried = 1;
3231                         goto again_with_private_addresses_allowed;
3232                 } else if (retried == 1) {
3233                         stcb->asoc.scope.ipv4_local_scope = 0;
3234                 }
3235         }
3236 #endif
3237 out:
3238 #ifdef INET
3239         if (sifa) {
3240                 if (retried == 1) {
3241                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3242                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3243                                         /* wrong base scope */
3244                                         continue;
3245                                 }
3246                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3247                                         struct sctp_ifa *tmp_sifa;
3248
3249 #ifdef INET
3250                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3251                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3252                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3253                                                 continue;
3254                                         }
3255 #endif
3256 #ifdef INET6
3257                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3258                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3259                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3260                                                 continue;
3261                                         }
3262 #endif
3263                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3264                                             (non_asoc_addr_ok == 0))
3265                                                 continue;
3266                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3267                                             dest_is_loop,
3268                                             dest_is_priv, fam);
3269                                         if (tmp_sifa == NULL) {
3270                                                 continue;
3271                                         }
3272                                         if (tmp_sifa == sifa) {
3273                                                 continue;
3274                                         }
3275                                         if (stcb) {
3276                                                 if (sctp_is_address_in_scope(tmp_sifa,
3277                                                     &stcb->asoc.scope, 0) == 0) {
3278                                                         continue;
3279                                                 }
3280                                                 if (((non_asoc_addr_ok == 0) &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3282                                                     (non_asoc_addr_ok &&
3283                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3284                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3285                                                         /*
3286                                                          * It is restricted
3287                                                          * for some reason..
3288                                                          * probably not yet
3289                                                          * added.
3290                                                          */
3291                                                         continue;
3292                                                 }
3293                                         }
3294                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3295                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3296                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3297                                         }
3298                                 }
3299                         }
3300                 }
3301                 atomic_add_int(&sifa->refcount, 1);
3302         }
3303 #endif
3304         return (sifa);
3305 }
3306
3307
3308
3309 /* tcb may be NULL */
3310 struct sctp_ifa *
3311 sctp_source_address_selection(struct sctp_inpcb *inp,
3312     struct sctp_tcb *stcb,
3313     sctp_route_t *ro,
3314     struct sctp_nets *net,
3315     int non_asoc_addr_ok, uint32_t vrf_id)
3316 {
3317         struct sctp_ifa *answer;
3318         uint8_t dest_is_priv, dest_is_loop;
3319         sa_family_t fam;
3320 #ifdef INET
3321         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325 #endif
3326
3327         /**
3328          * Rules:
3329          * - Find the route if needed, cache if I can.
3330          * - Look at interface address in route, Is it in the bound list. If so we
3331          *   have the best source.
3332          * - If not we must rotate amongst the addresses.
3333          *
3334          * Cavets and issues
3335          *
3336          * Do we need to pay attention to scope. We can have a private address
3337          * or a global address we are sourcing or sending to. So if we draw
3338          * it out
3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340          * For V4
3341          * ------------------------------------------
3342          *      source     *      dest  *  result
3343          * -----------------------------------------
3344          * <a>  Private    *    Global  *  NAT
3345          * -----------------------------------------
3346          * <b>  Private    *    Private *  No problem
3347          * -----------------------------------------
3348          * <c>  Global     *    Private *  Huh, How will this work?
3349          * -----------------------------------------
3350          * <d>  Global     *    Global  *  No Problem
3351          *------------------------------------------
3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353          * For V6
3354          *------------------------------------------
3355          *      source     *      dest  *  result
3356          * -----------------------------------------
3357          * <a>  Linklocal  *    Global  *
3358          * -----------------------------------------
3359          * <b>  Linklocal  * Linklocal  *  No problem
3360          * -----------------------------------------
3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
3362          * -----------------------------------------
3363          * <d>  Global     *    Global  *  No Problem
3364          *------------------------------------------
3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366          *
3367          * And then we add to that what happens if there are multiple addresses
3368          * assigned to an interface. Remember the ifa on a ifn is a linked
3369          * list of addresses. So one interface can have more than one IP
3370          * address. What happens if we have both a private and a global
3371          * address? Do we then use context of destination to sort out which
3372          * one is best? And what about NAT's sending P->G may get you a NAT
3373          * translation, or should you select the G thats on the interface in
3374          * preference.
3375          *
3376          * Decisions:
3377          *
3378          * - count the number of addresses on the interface.
3379          * - if it is one, no problem except case <c>.
3380          *   For <a> we will assume a NAT out there.
3381          * - if there are more than one, then we need to worry about scope P
3382          *   or G. We should prefer G -> G and P -> P if possible.
3383          *   Then as a secondary fall back to mixed types G->P being a last
3384          *   ditch one.
3385          * - The above all works for bound all, but bound specific we need to
3386          *   use the same concept but instead only consider the bound
3387          *   addresses. If the bound set is NOT assigned to the interface then
3388          *   we must use rotation amongst the bound addresses..
3389          */
3390         if (ro->ro_rt == NULL) {
3391                 /*
3392                  * Need a route to cache.
3393                  */
3394                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3395         }
3396         if (ro->ro_rt == NULL) {
3397                 return (NULL);
3398         }
3399         fam = ro->ro_dst.sa_family;
3400         dest_is_priv = dest_is_loop = 0;
3401         /* Setup our scopes for the destination */
3402         switch (fam) {
3403 #ifdef INET
3404         case AF_INET:
3405                 /* Scope based on outbound address */
3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407                         dest_is_loop = 1;
3408                         if (net != NULL) {
3409                                 /* mark it as local */
3410                                 net->addr_is_local = 1;
3411                         }
3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413                         dest_is_priv = 1;
3414                 }
3415                 break;
3416 #endif
3417 #ifdef INET6
3418         case AF_INET6:
3419                 /* Scope based on outbound address */
3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422                         /*
3423                          * If the address is a loopback address, which
3424                          * consists of "::1" OR "fe80::1%lo0", we are
3425                          * loopback scope. But we don't use dest_is_priv
3426                          * (link local addresses).
3427                          */
3428                         dest_is_loop = 1;
3429                         if (net != NULL) {
3430                                 /* mark it as local */
3431                                 net->addr_is_local = 1;
3432                         }
3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434                         dest_is_priv = 1;
3435                 }
3436                 break;
3437 #endif
3438         }
3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441         SCTP_IPI_ADDR_RLOCK();
3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443                 /*
3444                  * Bound all case
3445                  */
3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447                     dest_is_priv, dest_is_loop,
3448                     non_asoc_addr_ok, fam);
3449                 SCTP_IPI_ADDR_RUNLOCK();
3450                 return (answer);
3451         }
3452         /*
3453          * Subset bound case
3454          */
3455         if (stcb) {
3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457                     vrf_id, dest_is_priv,
3458                     dest_is_loop,
3459                     non_asoc_addr_ok, fam);
3460         } else {
3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462                     non_asoc_addr_ok,
3463                     dest_is_priv,
3464                     dest_is_loop, fam);
3465         }
3466         SCTP_IPI_ADDR_RUNLOCK();
3467         return (answer);
3468 }
3469
3470 static int
3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472 {
3473         struct cmsghdr cmh;
3474         struct sctp_sndinfo sndinfo;
3475         struct sctp_prinfo prinfo;
3476         struct sctp_authinfo authinfo;
3477         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3478         int found;
3479
3480         /*
3481          * Independent of how many mbufs, find the c_type inside the control
3482          * structure and copy out the data.
3483          */
3484         found = 0;
3485         tot_len = SCTP_BUF_LEN(control);
3486         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3487                 rem_len = tot_len - off;
3488                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3489                         /* There is not enough room for one more. */
3490                         return (found);
3491                 }
3492                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494                         /* We dont't have a complete CMSG header. */
3495                         return (found);
3496                 }
3497                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3498                         /* We don't have the complete CMSG. */
3499                         return (found);
3500                 }
3501                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3502                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3503                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3504                     ((c_type == cmh.cmsg_type) ||
3505                     ((c_type == SCTP_SNDRCV) &&
3506                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3507                     (cmh.cmsg_type == SCTP_PRINFO) ||
3508                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3509                         if (c_type == cmh.cmsg_type) {
3510                                 if (cpsize > INT_MAX) {
3511                                         return (found);
3512                                 }
3513                                 if (cmsg_data_len < (int)cpsize) {
3514                                         return (found);
3515                                 }
3516                                 /* It is exactly what we want. Copy it out. */
3517                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3518                                 return (1);
3519                         } else {
3520                                 struct sctp_sndrcvinfo *sndrcvinfo;
3521
3522                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3523                                 if (found == 0) {
3524                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3525                                                 return (found);
3526                                         }
3527                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3528                                 }
3529                                 switch (cmh.cmsg_type) {
3530                                 case SCTP_SNDINFO:
3531                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3532                                                 return (found);
3533                                         }
3534                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3535                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3536                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3537                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3538                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3539                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3540                                         break;
3541                                 case SCTP_PRINFO:
3542                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3546                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3547                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3548                                         } else {
3549                                                 sndrcvinfo->sinfo_timetolive = 0;
3550                                         }
3551                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3552                                         break;
3553                                 case SCTP_AUTHINFO:
3554                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3555                                                 return (found);
3556                                         }
3557                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3558                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3559                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3560                                         break;
3561                                 default:
3562                                         return (found);
3563                                 }
3564                                 found = 1;
3565                         }
3566                 }
3567         }
3568         return (found);
3569 }
3570
3571 static int
3572 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3573 {
3574         struct cmsghdr cmh;
3575         struct sctp_initmsg initmsg;
3576 #ifdef INET
3577         struct sockaddr_in sin;
3578 #endif
3579 #ifdef INET6
3580         struct sockaddr_in6 sin6;
3581 #endif
3582         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3583
3584         tot_len = SCTP_BUF_LEN(control);
3585         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3586                 rem_len = tot_len - off;
3587                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3588                         /* There is not enough room for one more. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3593                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3594                         /* We dont't have a complete CMSG header. */
3595                         *error = EINVAL;
3596                         return (1);
3597                 }
3598                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3599                         /* We don't have the complete CMSG. */
3600                         *error = EINVAL;
3601                         return (1);
3602                 }
3603                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3604                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3605                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3606                         switch (cmh.cmsg_type) {
3607                         case SCTP_INIT:
3608                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3609                                         *error = EINVAL;
3610                                         return (1);
3611                                 }
3612                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3613                                 if (initmsg.sinit_max_attempts)
3614                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3615                                 if (initmsg.sinit_num_ostreams)
3616                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3617                                 if (initmsg.sinit_max_instreams)
3618                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3619                                 if (initmsg.sinit_max_init_timeo)
3620                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3621                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3622                                         struct sctp_stream_out *tmp_str;
3623                                         unsigned int i;
3624 #if defined(SCTP_DETAILED_STR_STATS)
3625                                         int j;
3626 #endif
3627
3628                                         /* Default is NOT correct */
3629                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3630                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3631                                         SCTP_TCB_UNLOCK(stcb);
3632                                         SCTP_MALLOC(tmp_str,
3633                                             struct sctp_stream_out *,
3634                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3635                                             SCTP_M_STRMO);
3636                                         SCTP_TCB_LOCK(stcb);
3637                                         if (tmp_str != NULL) {
3638                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3639                                                 stcb->asoc.strmout = tmp_str;
3640                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3641                                         } else {
3642                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3643                                         }
3644                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3645                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3646                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3647                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3648                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3649 #if defined(SCTP_DETAILED_STR_STATS)
3650                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3651                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3652                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3653                                                 }
3654 #else
3655                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3656                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3657 #endif
3658                                                 stcb->asoc.strmout[i].sid = i;
3659                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3660                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3661                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3662                                         }
3663                                 }
3664                                 break;
3665 #ifdef INET
3666                         case SCTP_DSTADDRV4:
3667                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3668                                         *error = EINVAL;
3669                                         return (1);
3670                                 }
3671                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3672                                 sin.sin_family = AF_INET;
3673                                 sin.sin_len = sizeof(struct sockaddr_in);
3674                                 sin.sin_port = stcb->rport;
3675                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3676                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3677                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3678                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3683                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3684                                         *error = ENOBUFS;
3685                                         return (1);
3686                                 }
3687                                 break;
3688 #endif
3689 #ifdef INET6
3690                         case SCTP_DSTADDRV6:
3691                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3692                                         *error = EINVAL;
3693                                         return (1);
3694                                 }
3695                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3696                                 sin6.sin6_family = AF_INET6;
3697                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3698                                 sin6.sin6_port = stcb->rport;
3699                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3700                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3701                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3702                                         *error = EINVAL;
3703                                         return (1);
3704                                 }
3705 #ifdef INET
3706                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3707                                         in6_sin6_2_sin(&sin, &sin6);
3708                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3709                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3710                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3711                                                 *error = EINVAL;
3712                                                 return (1);
3713                                         }
3714                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3715                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3716                                                 *error = ENOBUFS;
3717                                                 return (1);
3718                                         }
3719                                 } else
3720 #endif
3721                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3722                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3723                                         *error = ENOBUFS;
3724                                         return (1);
3725                                 }
3726                                 break;
3727 #endif
3728                         default:
3729                                 break;
3730                         }
3731                 }
3732         }
3733         return (0);
3734 }
3735
3736 #if defined(INET) || defined(INET6)
3737 static struct sctp_tcb *
3738 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3739     uint16_t port,
3740     struct mbuf *control,
3741     struct sctp_nets **net_p,
3742     int *error)
3743 {
3744         struct cmsghdr cmh;
3745         struct sctp_tcb *stcb;
3746         struct sockaddr *addr;
3747 #ifdef INET
3748         struct sockaddr_in sin;
3749 #endif
3750 #ifdef INET6
3751         struct sockaddr_in6 sin6;
3752 #endif
3753         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3754
3755         tot_len = SCTP_BUF_LEN(control);
3756         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3757                 rem_len = tot_len - off;
3758                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3759                         /* There is not enough room for one more. */
3760                         *error = EINVAL;
3761                         return (NULL);
3762                 }
3763                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3764                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3765                         /* We dont't have a complete CMSG header. */
3766                         *error = EINVAL;
3767                         return (NULL);
3768                 }
3769                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3770                         /* We don't have the complete CMSG. */
3771                         *error = EINVAL;
3772                         return (NULL);
3773                 }
3774                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3775                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3776                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3777                         switch (cmh.cmsg_type) {
3778 #ifdef INET
3779                         case SCTP_DSTADDRV4:
3780                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3781                                         *error = EINVAL;
3782                                         return (NULL);
3783                                 }
3784                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3785                                 sin.sin_family = AF_INET;
3786                                 sin.sin_len = sizeof(struct sockaddr_in);
3787                                 sin.sin_port = port;
3788                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3789                                 addr = (struct sockaddr *)&sin;
3790                                 break;
3791 #endif
3792 #ifdef INET6
3793                         case SCTP_DSTADDRV6:
3794                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3795                                         *error = EINVAL;
3796                                         return (NULL);
3797                                 }
3798                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3799                                 sin6.sin6_family = AF_INET6;
3800                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3801                                 sin6.sin6_port = port;
3802                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3803 #ifdef INET
3804                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3805                                         in6_sin6_2_sin(&sin, &sin6);
3806                                         addr = (struct sockaddr *)&sin;
3807                                 } else
3808 #endif
3809                                         addr = (struct sockaddr *)&sin6;
3810                                 break;
3811 #endif
3812                         default:
3813                                 addr = NULL;
3814                                 break;
3815                         }
3816                         if (addr) {
3817                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3818                                 if (stcb != NULL) {
3819                                         return (stcb);
3820                                 }
3821                         }
3822                 }
3823         }
3824         return (NULL);
3825 }
3826 #endif
3827
3828 static struct mbuf *
3829 sctp_add_cookie(struct mbuf *init, int init_offset,
3830     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3831 {
3832         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3833         struct sctp_state_cookie *stc;
3834         struct sctp_paramhdr *ph;
3835         uint8_t *foo;
3836         int sig_offset;
3837         uint16_t cookie_sz;
3838
3839         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3840             sizeof(struct sctp_paramhdr)), 0,
3841             M_NOWAIT, 1, MT_DATA);
3842         if (mret == NULL) {
3843                 return (NULL);
3844         }
3845         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3846         if (copy_init == NULL) {
3847                 sctp_m_freem(mret);
3848                 return (NULL);
3849         }
3850 #ifdef SCTP_MBUF_LOGGING
3851         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3852                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3853         }
3854 #endif
3855         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3856             M_NOWAIT);
3857         if (copy_initack == NULL) {
3858                 sctp_m_freem(mret);
3859                 sctp_m_freem(copy_init);
3860                 return (NULL);
3861         }
3862 #ifdef SCTP_MBUF_LOGGING
3863         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3864                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3865         }
3866 #endif
3867         /* easy side we just drop it on the end */
3868         ph = mtod(mret, struct sctp_paramhdr *);
3869         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3870             sizeof(struct sctp_paramhdr);
3871         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3872             sizeof(struct sctp_paramhdr));
3873         ph->param_type = htons(SCTP_STATE_COOKIE);
3874         ph->param_length = 0;   /* fill in at the end */
3875         /* Fill in the stc cookie data */
3876         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3877
3878         /* tack the INIT and then the INIT-ACK onto the chain */
3879         cookie_sz = 0;
3880         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881                 cookie_sz += SCTP_BUF_LEN(m_at);
3882                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3883                         SCTP_BUF_NEXT(m_at) = copy_init;
3884                         break;
3885                 }
3886         }
3887         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888                 cookie_sz += SCTP_BUF_LEN(m_at);
3889                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3890                         SCTP_BUF_NEXT(m_at) = copy_initack;
3891                         break;
3892                 }
3893         }
3894         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3895                 cookie_sz += SCTP_BUF_LEN(m_at);
3896                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3897                         break;
3898                 }
3899         }
3900         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3901         if (sig == NULL) {
3902                 /* no space, so free the entire chain */
3903                 sctp_m_freem(mret);
3904                 return (NULL);
3905         }
3906         SCTP_BUF_LEN(sig) = 0;
3907         SCTP_BUF_NEXT(m_at) = sig;
3908         sig_offset = 0;
3909         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3910         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3911         *signature = foo;
3912         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3913         cookie_sz += SCTP_SIGNATURE_SIZE;
3914         ph->param_length = htons(cookie_sz);
3915         return (mret);
3916 }
3917
3918
3919 static uint8_t
3920 sctp_get_ect(struct sctp_tcb *stcb)
3921 {
3922         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3923                 return (SCTP_ECT0_BIT);
3924         } else {
3925                 return (0);
3926         }
3927 }
3928
3929 #if defined(INET) || defined(INET6)
3930 static void
3931 sctp_handle_no_route(struct sctp_tcb *stcb,
3932     struct sctp_nets *net,
3933     int so_locked)
3934 {
3935         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3936
3937         if (net) {
3938                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3939                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3940                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3941                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3942                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3943                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3944                                     stcb, 0,
3945                                     (void *)net,
3946                                     so_locked);
3947                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3948                                 net->dest_state &= ~SCTP_ADDR_PF;
3949                         }
3950                 }
3951                 if (stcb) {
3952                         if (net == stcb->asoc.primary_destination) {
3953                                 /* need a new primary */
3954                                 struct sctp_nets *alt;
3955
3956                                 alt = sctp_find_alternate_net(stcb, net, 0);
3957                                 if (alt != net) {
3958                                         if (stcb->asoc.alternate) {
3959                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3960                                         }
3961                                         stcb->asoc.alternate = alt;
3962                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3963                                         if (net->ro._s_addr) {
3964                                                 sctp_free_ifa(net->ro._s_addr);
3965                                                 net->ro._s_addr = NULL;
3966                                         }
3967                                         net->src_addr_selected = 0;
3968                                 }
3969                         }
3970                 }
3971         }
3972 }
3973 #endif
3974
3975 static int
3976 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3977     struct sctp_tcb *stcb,      /* may be NULL */
3978     struct sctp_nets *net,
3979     struct sockaddr *to,
3980     struct mbuf *m,
3981     uint32_t auth_offset,
3982     struct sctp_auth_chunk *auth,
3983     uint16_t auth_keyid,
3984     int nofragment_flag,
3985     int ecn_ok,
3986     int out_of_asoc_ok,
3987     uint16_t src_port,
3988     uint16_t dest_port,
3989     uint32_t v_tag,
3990     uint16_t port,
3991     union sctp_sockstore *over_addr,
3992     uint8_t mflowtype, uint32_t mflowid,
3993 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3994     int so_locked SCTP_UNUSED
3995 #else
3996     int so_locked
3997 #endif
3998 )
3999 {
4000 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4001         /**
4002          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4003          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4004          * - fill in the HMAC digest of any AUTH chunk in the packet.
4005          * - calculate and fill in the SCTP checksum.
4006          * - prepend an IP address header.
4007          * - if boundall use INADDR_ANY.
4008          * - if boundspecific do source address selection.
4009          * - set fragmentation option for ipV4.
4010          * - On return from IP output, check/adjust mtu size of output
4011          *   interface and smallest_mtu size as well.
4012          */
4013         /* Will need ifdefs around this */
4014         struct mbuf *newm;
4015         struct sctphdr *sctphdr;
4016         int packet_length;
4017         int ret;
4018 #if defined(INET) || defined(INET6)
4019         uint32_t vrf_id;
4020 #endif
4021 #if defined(INET) || defined(INET6)
4022         struct mbuf *o_pak;
4023         sctp_route_t *ro = NULL;
4024         struct udphdr *udp = NULL;
4025 #endif
4026         uint8_t tos_value;
4027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028         struct socket *so = NULL;
4029 #endif
4030
4031         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4032                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4033                 sctp_m_freem(m);
4034                 return (EFAULT);
4035         }
4036 #if defined(INET) || defined(INET6)
4037         if (stcb) {
4038                 vrf_id = stcb->asoc.vrf_id;
4039         } else {
4040                 vrf_id = inp->def_vrf_id;
4041         }
4042 #endif
4043         /* fill in the HMAC digest for any AUTH chunk in the packet */
4044         if ((auth != NULL) && (stcb != NULL)) {
4045                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4046         }
4047
4048         if (net) {
4049                 tos_value = net->dscp;
4050         } else if (stcb) {
4051                 tos_value = stcb->asoc.default_dscp;
4052         } else {
4053                 tos_value = inp->sctp_ep.default_dscp;
4054         }
4055
4056         switch (to->sa_family) {
4057 #ifdef INET
4058         case AF_INET:
4059                 {
4060                         struct ip *ip = NULL;
4061                         sctp_route_t iproute;
4062                         int len;
4063
4064                         len = SCTP_MIN_V4_OVERHEAD;
4065                         if (port) {
4066                                 len += sizeof(struct udphdr);
4067                         }
4068                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069                         if (newm == NULL) {
4070                                 sctp_m_freem(m);
4071                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072                                 return (ENOMEM);
4073                         }
4074                         SCTP_ALIGN_TO_END(newm, len);
4075                         SCTP_BUF_LEN(newm) = len;
4076                         SCTP_BUF_NEXT(newm) = m;
4077                         m = newm;
4078                         if (net != NULL) {
4079                                 m->m_pkthdr.flowid = net->flowid;
4080                                 M_HASHTYPE_SET(m, net->flowtype);
4081                         } else {
4082                                 m->m_pkthdr.flowid = mflowid;
4083                                 M_HASHTYPE_SET(m, mflowtype);
4084                         }
4085                         packet_length = sctp_calculate_len(m);
4086                         ip = mtod(m, struct ip *);
4087                         ip->ip_v = IPVERSION;
4088                         ip->ip_hl = (sizeof(struct ip) >> 2);
4089                         if (tos_value == 0) {
4090                                 /*
4091                                  * This means especially, that it is not set
4092                                  * at the SCTP layer. So use the value from
4093                                  * the IP layer.
4094                                  */
4095                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4096                         }
4097                         tos_value &= 0xfc;
4098                         if (ecn_ok) {
4099                                 tos_value |= sctp_get_ect(stcb);
4100                         }
4101                         if ((nofragment_flag) && (port == 0)) {
4102                                 ip->ip_off = htons(IP_DF);
4103                         } else {
4104                                 ip->ip_off = htons(0);
4105                         }
4106                         /* FreeBSD has a function for ip_id's */
4107                         ip_fillid(ip);
4108
4109                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4110                         ip->ip_len = htons(packet_length);
4111                         ip->ip_tos = tos_value;
4112                         if (port) {
4113                                 ip->ip_p = IPPROTO_UDP;
4114                         } else {
4115                                 ip->ip_p = IPPROTO_SCTP;
4116                         }
4117                         ip->ip_sum = 0;
4118                         if (net == NULL) {
4119                                 ro = &iproute;
4120                                 memset(&iproute, 0, sizeof(iproute));
4121                                 memcpy(&ro->ro_dst, to, to->sa_len);
4122                         } else {
4123                                 ro = (sctp_route_t *)&net->ro;
4124                         }
4125                         /* Now the address selection part */
4126                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4127
4128                         /* call the routine to select the src address */
4129                         if (net && out_of_asoc_ok == 0) {
4130                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4131                                         sctp_free_ifa(net->ro._s_addr);
4132                                         net->ro._s_addr = NULL;
4133                                         net->src_addr_selected = 0;
4134                                         if (ro->ro_rt) {
4135                                                 RTFREE(ro->ro_rt);
4136                                                 ro->ro_rt = NULL;
4137                                         }
4138                                 }
4139                                 if (net->src_addr_selected == 0) {
4140                                         /* Cache the source address */
4141                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4142                                             ro, net, 0,
4143                                             vrf_id);
4144                                         net->src_addr_selected = 1;
4145                                 }
4146                                 if (net->ro._s_addr == NULL) {
4147                                         /* No route to host */
4148                                         net->src_addr_selected = 0;
4149                                         sctp_handle_no_route(stcb, net, so_locked);
4150                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4151                                         sctp_m_freem(m);
4152                                         return (EHOSTUNREACH);
4153                                 }
4154                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4155                         } else {
4156                                 if (over_addr == NULL) {
4157                                         struct sctp_ifa *_lsrc;
4158
4159                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4160                                             net,
4161                                             out_of_asoc_ok,
4162                                             vrf_id);
4163                                         if (_lsrc == NULL) {
4164                                                 sctp_handle_no_route(stcb, net, so_locked);
4165                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4166                                                 sctp_m_freem(m);
4167                                                 return (EHOSTUNREACH);
4168                                         }
4169                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4170                                         sctp_free_ifa(_lsrc);
4171                                 } else {
4172                                         ip->ip_src = over_addr->sin.sin_addr;
4173                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4174                                 }
4175                         }
4176                         if (port) {
4177                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4178                                         sctp_handle_no_route(stcb, net, so_locked);
4179                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4180                                         sctp_m_freem(m);
4181                                         return (EHOSTUNREACH);
4182                                 }
4183                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4184                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4185                                 udp->uh_dport = port;
4186                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4187                                 if (V_udp_cksum) {
4188                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4189                                 } else {
4190                                         udp->uh_sum = 0;
4191                                 }
4192                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4193                         } else {
4194                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4195                         }
4196
4197                         sctphdr->src_port = src_port;
4198                         sctphdr->dest_port = dest_port;
4199                         sctphdr->v_tag = v_tag;
4200                         sctphdr->checksum = 0;
4201
4202                         /*
4203                          * If source address selection fails and we find no
4204                          * route then the ip_output should fail as well with
4205                          * a NO_ROUTE_TO_HOST type error. We probably should
4206                          * catch that somewhere and abort the association
4207                          * right away (assuming this is an INIT being sent).
4208                          */
4209                         if (ro->ro_rt == NULL) {
4210                                 /*
4211                                  * src addr selection failed to find a route
4212                                  * (or valid source addr), so we can't get
4213                                  * there from here (yet)!
4214                                  */
4215                                 sctp_handle_no_route(stcb, net, so_locked);
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4217                                 sctp_m_freem(m);
4218                                 return (EHOSTUNREACH);
4219                         }
4220                         if (ro != &iproute) {
4221                                 memcpy(&iproute, ro, sizeof(*ro));
4222                         }
4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4224                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4225                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4226                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4227                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4228                             (void *)ro->ro_rt);
4229
4230                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4231                                 /* failed to prepend data, give up */
4232                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4233                                 sctp_m_freem(m);
4234                                 return (ENOMEM);
4235                         }
4236                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4237                         if (port) {
4238                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4239                                 SCTP_STAT_INCR(sctps_sendswcrc);
4240                                 if (V_udp_cksum) {
4241                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4242                                 }
4243                         } else {
4244                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4245                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4246                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4247                         }
4248 #ifdef SCTP_PACKET_LOGGING
4249                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4250                                 sctp_packet_log(o_pak);
4251 #endif
4252                         /* send it out.  table id is taken from stcb */
4253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4254                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4255                                 so = SCTP_INP_SO(inp);
4256                                 SCTP_SOCKET_UNLOCK(so, 0);
4257                         }
4258 #endif
4259                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4260                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4262                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4263                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4264                                 SCTP_TCB_UNLOCK(stcb);
4265                                 SCTP_SOCKET_LOCK(so, 0);
4266                                 SCTP_TCB_LOCK(stcb);
4267                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4268                         }
4269 #endif
4270                         if (port) {
4271                                 UDPSTAT_INC(udps_opackets);
4272                         }
4273                         SCTP_STAT_INCR(sctps_sendpackets);
4274                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4275                         if (ret)
4276                                 SCTP_STAT_INCR(sctps_senderrors);
4277
4278                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4279                         if (net == NULL) {
4280                                 /* free tempy routes */
4281                                 RO_RTFREE(ro);
4282                         } else {
4283                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4284                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4285                                         uint32_t mtu;
4286
4287                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4288                                         if (mtu > 0) {
4289                                                 if (net->port) {
4290                                                         mtu -= sizeof(struct udphdr);
4291                                                 }
4292                                                 if (mtu < net->mtu) {
4293                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4294                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4295                                                         }
4296                                                         net->mtu = mtu;
4297                                                 }
4298                                         }
4299                                 } else if (ro->ro_rt == NULL) {
4300                                         /* route was freed */
4301                                         if (net->ro._s_addr &&
4302                                             net->src_addr_selected) {
4303                                                 sctp_free_ifa(net->ro._s_addr);
4304                                                 net->ro._s_addr = NULL;
4305                                         }
4306                                         net->src_addr_selected = 0;
4307                                 }
4308                         }
4309                         return (ret);
4310                 }
4311 #endif
4312 #ifdef INET6
4313         case AF_INET6:
4314                 {
4315                         uint32_t flowlabel, flowinfo;
4316                         struct ip6_hdr *ip6h;
4317                         struct route_in6 ip6route;
4318                         struct ifnet *ifp;
4319                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4320                         int prev_scope = 0;
4321                         struct sockaddr_in6 lsa6_storage;
4322                         int error;
4323                         u_short prev_port = 0;
4324                         int len;
4325
4326                         if (net) {
4327                                 flowlabel = net->flowlabel;
4328                         } else if (stcb) {
4329                                 flowlabel = stcb->asoc.default_flowlabel;
4330                         } else {
4331                                 flowlabel = inp->sctp_ep.default_flowlabel;
4332                         }
4333                         if (flowlabel == 0) {
4334                                 /*
4335                                  * This means especially, that it is not set
4336                                  * at the SCTP layer. So use the value from
4337                                  * the IP layer.
4338                                  */
4339                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4340                         }
4341                         flowlabel &= 0x000fffff;
4342                         len = SCTP_MIN_OVERHEAD;
4343                         if (port) {
4344                                 len += sizeof(struct udphdr);
4345                         }
4346                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4347                         if (newm == NULL) {
4348                                 sctp_m_freem(m);
4349                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4350                                 return (ENOMEM);
4351                         }
4352                         SCTP_ALIGN_TO_END(newm, len);
4353                         SCTP_BUF_LEN(newm) = len;
4354                         SCTP_BUF_NEXT(newm) = m;
4355                         m = newm;
4356                         if (net != NULL) {
4357                                 m->m_pkthdr.flowid = net->flowid;
4358                                 M_HASHTYPE_SET(m, net->flowtype);
4359                         } else {
4360                                 m->m_pkthdr.flowid = mflowid;
4361                                 M_HASHTYPE_SET(m, mflowtype);
4362                         }
4363                         packet_length = sctp_calculate_len(m);
4364
4365                         ip6h = mtod(m, struct ip6_hdr *);
4366                         /* protect *sin6 from overwrite */
4367                         sin6 = (struct sockaddr_in6 *)to;
4368                         tmp = *sin6;
4369                         sin6 = &tmp;
4370
4371                         /* KAME hack: embed scopeid */
4372                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4373                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4374                                 sctp_m_freem(m);
4375                                 return (EINVAL);
4376                         }
4377                         if (net == NULL) {
4378                                 memset(&ip6route, 0, sizeof(ip6route));
4379                                 ro = (sctp_route_t *)&ip6route;
4380                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4381                         } else {
4382                                 ro = (sctp_route_t *)&net->ro;
4383                         }
4384                         /*
4385                          * We assume here that inp_flow is in host byte
4386                          * order within the TCB!
4387                          */
4388                         if (tos_value == 0) {
4389                                 /*
4390                                  * This means especially, that it is not set
4391                                  * at the SCTP layer. So use the value from
4392                                  * the IP layer.
4393                                  */
4394                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4395                         }
4396                         tos_value &= 0xfc;
4397                         if (ecn_ok) {
4398                                 tos_value |= sctp_get_ect(stcb);
4399                         }
4400                         flowinfo = 0x06;
4401                         flowinfo <<= 8;
4402                         flowinfo |= tos_value;
4403                         flowinfo <<= 20;
4404                         flowinfo |= flowlabel;
4405                         ip6h->ip6_flow = htonl(flowinfo);
4406                         if (port) {
4407                                 ip6h->ip6_nxt = IPPROTO_UDP;
4408                         } else {
4409                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4410                         }
4411                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4412                         ip6h->ip6_dst = sin6->sin6_addr;
4413
4414                         /*
4415                          * Add SRC address selection here: we can only reuse
4416                          * to a limited degree the kame src-addr-sel, since
4417                          * we can try their selection but it may not be
4418                          * bound.
4419                          */
4420                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4421                         lsa6_tmp.sin6_family = AF_INET6;
4422                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4423                         lsa6 = &lsa6_tmp;
4424                         if (net && out_of_asoc_ok == 0) {
4425                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4426                                         sctp_free_ifa(net->ro._s_addr);
4427                                         net->ro._s_addr = NULL;
4428                                         net->src_addr_selected = 0;
4429                                         if (ro->ro_rt) {
4430                                                 RTFREE(ro->ro_rt);
4431                                                 ro->ro_rt = NULL;
4432                                         }
4433                                 }
4434                                 if (net->src_addr_selected == 0) {
4435                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4436                                         /* KAME hack: embed scopeid */
4437                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4438                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4439                                                 sctp_m_freem(m);
4440                                                 return (EINVAL);
4441                                         }
4442                                         /* Cache the source address */
4443                                         net->ro._s_addr = sctp_source_address_selection(inp,
4444                                             stcb,
4445                                             ro,
4446                                             net,
4447                                             0,
4448                                             vrf_id);
4449                                         (void)sa6_recoverscope(sin6);
4450                                         net->src_addr_selected = 1;
4451                                 }
4452                                 if (net->ro._s_addr == NULL) {
4453                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4454                                         net->src_addr_selected = 0;
4455                                         sctp_handle_no_route(stcb, net, so_locked);
4456                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4457                                         sctp_m_freem(m);
4458                                         return (EHOSTUNREACH);
4459                                 }
4460                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4461                         } else {
4462                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4463                                 /* KAME hack: embed scopeid */
4464                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4465                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4466                                         sctp_m_freem(m);
4467                                         return (EINVAL);
4468                                 }
4469                                 if (over_addr == NULL) {
4470                                         struct sctp_ifa *_lsrc;
4471
4472                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4473                                             net,
4474                                             out_of_asoc_ok,
4475                                             vrf_id);
4476                                         if (_lsrc == NULL) {
4477                                                 sctp_handle_no_route(stcb, net, so_locked);
4478                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4479                                                 sctp_m_freem(m);
4480                                                 return (EHOSTUNREACH);
4481                                         }
4482                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4483                                         sctp_free_ifa(_lsrc);
4484                                 } else {
4485                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4486                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4487                                 }
4488                                 (void)sa6_recoverscope(sin6);
4489                         }
4490                         lsa6->sin6_port = inp->sctp_lport;
4491
4492                         if (ro->ro_rt == NULL) {
4493                                 /*
4494                                  * src addr selection failed to find a route
4495                                  * (or valid source addr), so we can't get
4496                                  * there from here!
4497                                  */
4498                                 sctp_handle_no_route(stcb, net, so_locked);
4499                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4500                                 sctp_m_freem(m);
4501                                 return (EHOSTUNREACH);
4502                         }
4503                         /*
4504                          * XXX: sa6 may not have a valid sin6_scope_id in
4505                          * the non-SCOPEDROUTING case.
4506                          */
4507                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4508                         lsa6_storage.sin6_family = AF_INET6;
4509                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4510                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4511                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4512                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4513                                 sctp_m_freem(m);
4514                                 return (error);
4515                         }
4516                         /* XXX */
4517                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4518                         lsa6_storage.sin6_port = inp->sctp_lport;
4519                         lsa6 = &lsa6_storage;
4520                         ip6h->ip6_src = lsa6->sin6_addr;
4521
4522                         if (port) {
4523                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4524                                         sctp_handle_no_route(stcb, net, so_locked);
4525                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4526                                         sctp_m_freem(m);
4527                                         return (EHOSTUNREACH);
4528                                 }
4529                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4530                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4531                                 udp->uh_dport = port;
4532                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4533                                 udp->uh_sum = 0;
4534                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4535                         } else {
4536                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4537                         }
4538
4539                         sctphdr->src_port = src_port;
4540                         sctphdr->dest_port = dest_port;
4541                         sctphdr->v_tag = v_tag;
4542                         sctphdr->checksum = 0;
4543
4544                         /*
4545                          * We set the hop limit now since there is a good
4546                          * chance that our ro pointer is now filled
4547                          */
4548                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4549                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4550
4551 #ifdef SCTP_DEBUG
4552                         /* Copy to be sure something bad is not happening */
4553                         sin6->sin6_addr = ip6h->ip6_dst;
4554                         lsa6->sin6_addr = ip6h->ip6_src;
4555 #endif
4556
4557                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4558                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4559                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4560                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4561                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4562                         if (net) {
4563                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4564                                 /*
4565                                  * preserve the port and scope for link
4566                                  * local send
4567                                  */
4568                                 prev_scope = sin6->sin6_scope_id;
4569                                 prev_port = sin6->sin6_port;
4570                         }
4571
4572                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4573                                 /* failed to prepend data, give up */
4574                                 sctp_m_freem(m);
4575                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4576                                 return (ENOMEM);
4577                         }
4578                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4579                         if (port) {
4580                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4581                                 SCTP_STAT_INCR(sctps_sendswcrc);
4582                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4583                                         udp->uh_sum = 0xffff;
4584                                 }
4585                         } else {
4586                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4587                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4588                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4589                         }
4590                         /* send it out. table id is taken from stcb */
4591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4592                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4593                                 so = SCTP_INP_SO(inp);
4594                                 SCTP_SOCKET_UNLOCK(so, 0);
4595                         }
4596 #endif
4597 #ifdef SCTP_PACKET_LOGGING
4598                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4599                                 sctp_packet_log(o_pak);
4600 #endif
4601                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4602                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4604                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4605                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4606                                 SCTP_TCB_UNLOCK(stcb);
4607                                 SCTP_SOCKET_LOCK(so, 0);
4608                                 SCTP_TCB_LOCK(stcb);
4609                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4610                         }
4611 #endif
4612                         if (net) {
4613                                 /* for link local this must be done */
4614                                 sin6->sin6_scope_id = prev_scope;
4615                                 sin6->sin6_port = prev_port;
4616                         }
4617                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4618                         if (port) {
4619                                 UDPSTAT_INC(udps_opackets);
4620                         }
4621                         SCTP_STAT_INCR(sctps_sendpackets);
4622                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4623                         if (ret) {
4624                                 SCTP_STAT_INCR(sctps_senderrors);
4625                         }
4626                         if (net == NULL) {
4627                                 /* Now if we had a temp route free it */
4628                                 RO_RTFREE(ro);
4629                         } else {
4630                                 /*
4631                                  * PMTU check versus smallest asoc MTU goes
4632                                  * here
4633                                  */
4634                                 if (ro->ro_rt == NULL) {
4635                                         /* Route was freed */
4636                                         if (net->ro._s_addr &&
4637                                             net->src_addr_selected) {
4638                                                 sctp_free_ifa(net->ro._s_addr);
4639                                                 net->ro._s_addr = NULL;
4640                                         }
4641                                         net->src_addr_selected = 0;
4642                                 }
4643                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4644                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4645                                         uint32_t mtu;
4646
4647                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4648                                         if (mtu > 0) {
4649                                                 if (net->port) {
4650                                                         mtu -= sizeof(struct udphdr);
4651                                                 }
4652                                                 if (mtu < net->mtu) {
4653                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4654                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4655                                                         }
4656                                                         net->mtu = mtu;
4657                                                 }
4658                                         }
4659                                 } else if (ifp) {
4660                                         if (ND_IFINFO(ifp)->linkmtu &&
4661                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4662                                                 sctp_mtu_size_reset(inp,
4663                                                     &stcb->asoc,
4664                                                     ND_IFINFO(ifp)->linkmtu);
4665                                         }
4666                                 }
4667                         }
4668                         return (ret);
4669                 }
4670 #endif
4671         default:
4672                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4673                     ((struct sockaddr *)to)->sa_family);
4674                 sctp_m_freem(m);
4675                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4676                 return (EFAULT);
4677         }
4678 }
4679
4680
4681 void
4682 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4683 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4684     SCTP_UNUSED
4685 #endif
4686 )
4687 {
4688         struct mbuf *m, *m_last;
4689         struct sctp_nets *net;
4690         struct sctp_init_chunk *init;
4691         struct sctp_supported_addr_param *sup_addr;
4692         struct sctp_adaptation_layer_indication *ali;
4693         struct sctp_supported_chunk_types_param *pr_supported;
4694         struct sctp_paramhdr *ph;
4695         int cnt_inits_to = 0;
4696         int error;
4697         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4698
4699         /* INIT's always go to the primary (and usually ONLY address) */
4700         net = stcb->asoc.primary_destination;
4701         if (net == NULL) {
4702                 net = TAILQ_FIRST(&stcb->asoc.nets);
4703                 if (net == NULL) {
4704                         /* TSNH */
4705                         return;
4706                 }
4707                 /* we confirm any address we send an INIT to */
4708                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4709                 (void)sctp_set_primary_addr(stcb, NULL, net);
4710         } else {
4711                 /* we confirm any address we send an INIT to */
4712                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4713         }
4714         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4715 #ifdef INET6
4716         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4717                 /*
4718                  * special hook, if we are sending to link local it will not
4719                  * show up in our private address count.
4720                  */
4721                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4722                         cnt_inits_to = 1;
4723         }
4724 #endif
4725         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4726                 /* This case should not happen */
4727                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4728                 return;
4729         }
4730         /* start the INIT timer */
4731         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4732
4733         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4734         if (m == NULL) {
4735                 /* No memory, INIT timer will re-attempt. */
4736                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4737                 return;
4738         }
4739         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4740         padding_len = 0;
4741         /* Now lets put the chunk header in place */
4742         init = mtod(m, struct sctp_init_chunk *);
4743         /* now the chunk header */
4744         init->ch.chunk_type = SCTP_INITIATION;
4745         init->ch.chunk_flags = 0;
4746         /* fill in later from mbuf we build */
4747         init->ch.chunk_length = 0;
4748         /* place in my tag */
4749         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4750         /* set up some of the credits. */
4751         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4752             SCTP_MINIMAL_RWND));
4753         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4754         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4755         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4756
4757         /* Adaptation layer indication parameter */
4758         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4759                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4760                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4761                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4762                 ali->ph.param_length = htons(parameter_len);
4763                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4764                 chunk_len += parameter_len;
4765         }
4766
4767         /* ECN parameter */
4768         if (stcb->asoc.ecn_supported == 1) {
4769                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4772                 ph->param_length = htons(parameter_len);
4773                 chunk_len += parameter_len;
4774         }
4775
4776         /* PR-SCTP supported parameter */
4777         if (stcb->asoc.prsctp_supported == 1) {
4778                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4779                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4780                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4781                 ph->param_length = htons(parameter_len);
4782                 chunk_len += parameter_len;
4783         }
4784
4785         /* Add NAT friendly parameter. */
4786         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4787                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4788                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4789                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4790                 ph->param_length = htons(parameter_len);
4791                 chunk_len += parameter_len;
4792         }
4793
4794         /* And now tell the peer which extensions we support */
4795         num_ext = 0;
4796         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4797         if (stcb->asoc.prsctp_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4799                 if (stcb->asoc.idata_supported) {
4800                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4801                 }
4802         }
4803         if (stcb->asoc.auth_supported == 1) {
4804                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4805         }
4806         if (stcb->asoc.asconf_supported == 1) {
4807                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4808                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4809         }
4810         if (stcb->asoc.reconfig_supported == 1) {
4811                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4812         }
4813         if (stcb->asoc.idata_supported) {
4814                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4815         }
4816         if (stcb->asoc.nrsack_supported == 1) {
4817                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4818         }
4819         if (stcb->asoc.pktdrop_supported == 1) {
4820                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4821         }
4822         if (num_ext > 0) {
4823                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4824                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4825                 pr_supported->ph.param_length = htons(parameter_len);
4826                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4827                 chunk_len += parameter_len;
4828         }
4829         /* add authentication parameters */
4830         if (stcb->asoc.auth_supported) {
4831                 /* attach RANDOM parameter, if available */
4832                 if (stcb->asoc.authinfo.random != NULL) {
4833                         struct sctp_auth_random *randp;
4834
4835                         if (padding_len > 0) {
4836                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4837                                 chunk_len += padding_len;
4838                                 padding_len = 0;
4839                         }
4840                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4841                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4842                         /* random key already contains the header */
4843                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4844                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4845                         chunk_len += parameter_len;
4846                 }
4847                 /* add HMAC_ALGO parameter */
4848                 if (stcb->asoc.local_hmacs != NULL) {
4849                         struct sctp_auth_hmac_algo *hmacs;
4850
4851                         if (padding_len > 0) {
4852                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4853                                 chunk_len += padding_len;
4854                                 padding_len = 0;
4855                         }
4856                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4857                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4858                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4859                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4860                         hmacs->ph.param_length = htons(parameter_len);
4861                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4862                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4863                         chunk_len += parameter_len;
4864                 }
4865                 /* add CHUNKS parameter */
4866                 if (stcb->asoc.local_auth_chunks != NULL) {
4867                         struct sctp_auth_chunk_list *chunks;
4868
4869                         if (padding_len > 0) {
4870                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871                                 chunk_len += padding_len;
4872                                 padding_len = 0;
4873                         }
4874                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4875                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4876                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4877                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4878                         chunks->ph.param_length = htons(parameter_len);
4879                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4880                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4881                         chunk_len += parameter_len;
4882                 }
4883         }
4884
4885         /* now any cookie time extensions */
4886         if (stcb->asoc.cookie_preserve_req) {
4887                 struct sctp_cookie_perserve_param *cookie_preserve;
4888
4889                 if (padding_len > 0) {
4890                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4891                         chunk_len += padding_len;
4892                         padding_len = 0;
4893                 }
4894                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4895                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4896                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4897                 cookie_preserve->ph.param_length = htons(parameter_len);
4898                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4899                 stcb->asoc.cookie_preserve_req = 0;
4900                 chunk_len += parameter_len;
4901         }
4902
4903         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4904                 uint8_t i;
4905
4906                 if (padding_len > 0) {
4907                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4908                         chunk_len += padding_len;
4909                         padding_len = 0;
4910                 }
4911                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4912                 if (stcb->asoc.scope.ipv4_addr_legal) {
4913                         parameter_len += (uint16_t)sizeof(uint16_t);
4914                 }
4915                 if (stcb->asoc.scope.ipv6_addr_legal) {
4916                         parameter_len += (uint16_t)sizeof(uint16_t);
4917                 }
4918                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4919                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4920                 sup_addr->ph.param_length = htons(parameter_len);
4921                 i = 0;
4922                 if (stcb->asoc.scope.ipv4_addr_legal) {
4923                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4924                 }
4925                 if (stcb->asoc.scope.ipv6_addr_legal) {
4926                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4927                 }
4928                 padding_len = 4 - 2 * i;
4929                 chunk_len += parameter_len;
4930         }
4931
4932         SCTP_BUF_LEN(m) = chunk_len;
4933         /* now the addresses */
4934         /*
4935          * To optimize this we could put the scoping stuff into a structure
4936          * and remove the individual uint8's from the assoc structure. Then
4937          * we could just sifa in the address within the stcb. But for now
4938          * this is a quick hack to get the address stuff teased apart.
4939          */
4940         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4941             m, cnt_inits_to,
4942             &padding_len, &chunk_len);
4943
4944         init->ch.chunk_length = htons(chunk_len);
4945         if (padding_len > 0) {
4946                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4947                         sctp_m_freem(m);
4948                         return;
4949                 }
4950         }
4951         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4952         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4953             (struct sockaddr *)&net->ro._l_addr,
4954             m, 0, NULL, 0, 0, 0, 0,
4955             inp->sctp_lport, stcb->rport, htonl(0),
4956             net->port, NULL,
4957             0, 0,
4958             so_locked))) {
4959                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4960                 if (error == ENOBUFS) {
4961                         stcb->asoc.ifp_had_enobuf = 1;
4962                         SCTP_STAT_INCR(sctps_lowlevelerr);
4963                 }
4964         } else {
4965                 stcb->asoc.ifp_had_enobuf = 0;
4966         }
4967         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4968         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4969 }
4970
4971 struct mbuf *
4972 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4973     int param_offset, int *abort_processing,
4974     struct sctp_chunkhdr *cp,
4975     int *nat_friendly,
4976     int *cookie_found)
4977 {
4978         /*
4979          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4980          * being equal to the beginning of the params i.e. (iphlen +
4981          * sizeof(struct sctp_init_msg) parse through the parameters to the
4982          * end of the mbuf verifying that all parameters are known.
4983          *
4984          * For unknown parameters build and return a mbuf with
4985          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4986          * processing this chunk stop, and set *abort_processing to 1.
4987          *
4988          * By having param_offset be pre-set to where parameters begin it is
4989          * hoped that this routine may be reused in the future by new
4990          * features.
4991          */
4992         struct sctp_paramhdr *phdr, params;
4993
4994         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4995         int at, limit, pad_needed;
4996         uint16_t ptype, plen, padded_size;
4997
4998         *abort_processing = 0;
4999         if (cookie_found != NULL) {
5000                 *cookie_found = 0;
5001         }
5002         mat = in_initpkt;
5003         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5004         at = param_offset;
5005         op_err = NULL;
5006         op_err_last = NULL;
5007         pad_needed = 0;
5008         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5009         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5010         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5011                 ptype = ntohs(phdr->param_type);
5012                 plen = ntohs(phdr->param_length);
5013                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5014                         /* wacked parameter */
5015                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5016                         goto invalid_size;
5017                 }
5018                 limit -= SCTP_SIZE32(plen);
5019                 /*-
5020                  * All parameters for all chunks that we know/understand are
5021                  * listed here. We process them other places and make
5022                  * appropriate stop actions per the upper bits. However this
5023                  * is the generic routine processor's can call to get back
5024                  * an operr.. to either incorporate (init-ack) or send.
5025                  */
5026                 padded_size = SCTP_SIZE32(plen);
5027                 switch (ptype) {
5028                         /* Param's with variable size */
5029                 case SCTP_HEARTBEAT_INFO:
5030                 case SCTP_UNRECOG_PARAM:
5031                 case SCTP_ERROR_CAUSE_IND:
5032                         /* ok skip fwd */
5033                         at += padded_size;
5034                         break;
5035                 case SCTP_STATE_COOKIE:
5036                         if (cookie_found != NULL) {
5037                                 *cookie_found = 1;
5038                         }
5039                         at += padded_size;
5040                         break;
5041                         /* Param's with variable size within a range */
5042                 case SCTP_CHUNK_LIST:
5043                 case SCTP_SUPPORTED_CHUNK_EXT:
5044                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5045                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5046                                 goto invalid_size;
5047                         }
5048                         at += padded_size;
5049                         break;
5050                 case SCTP_SUPPORTED_ADDRTYPE:
5051                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5053                                 goto invalid_size;
5054                         }
5055                         at += padded_size;
5056                         break;
5057                 case SCTP_RANDOM:
5058                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5060                                 goto invalid_size;
5061                         }
5062                         at += padded_size;
5063                         break;
5064                 case SCTP_SET_PRIM_ADDR:
5065                 case SCTP_DEL_IP_ADDRESS:
5066                 case SCTP_ADD_IP_ADDRESS:
5067                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5068                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5069                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5070                                 goto invalid_size;
5071                         }
5072                         at += padded_size;
5073                         break;
5074                         /* Param's with a fixed size */
5075                 case SCTP_IPV4_ADDRESS:
5076                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5077                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5078                                 goto invalid_size;
5079                         }
5080                         at += padded_size;
5081                         break;
5082                 case SCTP_IPV6_ADDRESS:
5083                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5084                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5085                                 goto invalid_size;
5086                         }
5087                         at += padded_size;
5088                         break;
5089                 case SCTP_COOKIE_PRESERVE:
5090                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5091                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5092                                 goto invalid_size;
5093                         }
5094                         at += padded_size;
5095                         break;
5096                 case SCTP_HAS_NAT_SUPPORT:
5097                         *nat_friendly = 1;
5098                         /* fall through */
5099                 case SCTP_PRSCTP_SUPPORTED:
5100                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5101                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5102                                 goto invalid_size;
5103                         }
5104                         at += padded_size;
5105                         break;
5106                 case SCTP_ECN_CAPABLE:
5107                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5108                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5109                                 goto invalid_size;
5110                         }
5111                         at += padded_size;
5112                         break;
5113                 case SCTP_ULP_ADAPTATION:
5114                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5115                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5116                                 goto invalid_size;
5117                         }
5118                         at += padded_size;
5119                         break;
5120                 case SCTP_SUCCESS_REPORT:
5121                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5122                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5123                                 goto invalid_size;
5124                         }
5125                         at += padded_size;
5126                         break;
5127                 case SCTP_HOSTNAME_ADDRESS:
5128                         {
5129                                 /* Hostname parameters are deprecated. */
5130                                 struct sctp_gen_error_cause *cause;
5131                                 int l_len;
5132
5133                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5134                                 *abort_processing = 1;
5135                                 sctp_m_freem(op_err);
5136                                 op_err = NULL;
5137                                 op_err_last = NULL;
5138 #ifdef INET6
5139                                 l_len = SCTP_MIN_OVERHEAD;
5140 #else
5141                                 l_len = SCTP_MIN_V4_OVERHEAD;
5142 #endif
5143                                 l_len += sizeof(struct sctp_chunkhdr);
5144                                 l_len += sizeof(struct sctp_gen_error_cause);
5145                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5146                                 if (op_err != NULL) {
5147                                         /*
5148                                          * Pre-reserve space for IP, SCTP,
5149                                          * and chunk header.
5150                                          */
5151 #ifdef INET6
5152                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5153 #else
5154                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5155 #endif
5156                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5157                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5158                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5159                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5160                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5161                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5162                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5163                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5164                                                 sctp_m_freem(op_err);
5165                                                 op_err = NULL;
5166                                                 op_err_last = NULL;
5167                                         }
5168                                 }
5169                                 return (op_err);
5170                                 break;
5171                         }
5172                 default:
5173                         /*
5174                          * we do not recognize the parameter figure out what
5175                          * we do.
5176                          */
5177                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5178                         if ((ptype & 0x4000) == 0x4000) {
5179                                 /* Report bit is set?? */
5180                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5181                                 if (op_err == NULL) {
5182                                         int l_len;
5183
5184                                         /* Ok need to try to get an mbuf */
5185 #ifdef INET6
5186                                         l_len = SCTP_MIN_OVERHEAD;
5187 #else
5188                                         l_len = SCTP_MIN_V4_OVERHEAD;
5189 #endif
5190                                         l_len += sizeof(struct sctp_chunkhdr);
5191                                         l_len += sizeof(struct sctp_paramhdr);
5192                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5193                                         if (op_err) {
5194                                                 SCTP_BUF_LEN(op_err) = 0;
5195 #ifdef INET6
5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5197 #else
5198                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5199 #endif
5200                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5201                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5202                                                 op_err_last = op_err;
5203                                         }
5204                                 }
5205                                 if (op_err != NULL) {
5206                                         /* If we have space */
5207                                         struct sctp_paramhdr *param;
5208
5209                                         if (pad_needed > 0) {
5210                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5211                                         }
5212                                         if (op_err_last == NULL) {
5213                                                 sctp_m_freem(op_err);
5214                                                 op_err = NULL;
5215                                                 op_err_last = NULL;
5216                                                 goto more_processing;
5217                                         }
5218                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5219                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5220                                                 if (m_tmp == NULL) {
5221                                                         sctp_m_freem(op_err);
5222                                                         op_err = NULL;
5223                                                         op_err_last = NULL;
5224                                                         goto more_processing;
5225                                                 }
5226                                                 SCTP_BUF_LEN(m_tmp) = 0;
5227                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
5228                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
5229                                                 op_err_last = m_tmp;
5230                                         }
5231                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5232                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
5233                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5234                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5235                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5236                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5237                                                 sctp_m_freem(op_err);
5238                                                 op_err = NULL;
5239                                                 op_err_last = NULL;
5240                                                 goto more_processing;
5241                                         } else {
5242                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5243                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
5244                                                 }
5245                                         }
5246                                         if (plen % 4 != 0) {
5247                                                 pad_needed = 4 - (plen % 4);
5248                                         } else {
5249                                                 pad_needed = 0;
5250                                         }
5251                                 }
5252                         }
5253         more_processing:
5254                         if ((ptype & 0x8000) == 0x0000) {
5255                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5256                                 return (op_err);
5257                         } else {
5258                                 /* skip this chunk and continue processing */
5259                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5260                                 at += SCTP_SIZE32(plen);
5261                         }
5262                         break;
5263
5264                 }
5265                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5266         }
5267         return (op_err);
5268 invalid_size:
5269         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5270         *abort_processing = 1;
5271         sctp_m_freem(op_err);
5272         op_err = NULL;
5273         op_err_last = NULL;
5274         if (phdr != NULL) {
5275                 struct sctp_paramhdr *param;
5276                 int l_len;
5277 #ifdef INET6
5278                 l_len = SCTP_MIN_OVERHEAD;
5279 #else
5280                 l_len = SCTP_MIN_V4_OVERHEAD;
5281 #endif
5282                 l_len += sizeof(struct sctp_chunkhdr);
5283                 l_len += (2 * sizeof(struct sctp_paramhdr));
5284                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5285                 if (op_err) {
5286                         SCTP_BUF_LEN(op_err) = 0;
5287 #ifdef INET6
5288                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5289 #else
5290                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5291 #endif
5292                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5293                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5294                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5295                         param = mtod(op_err, struct sctp_paramhdr *);
5296                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5297                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5298                         param++;
5299                         param->param_type = htons(ptype);
5300                         param->param_length = htons(plen);
5301                 }
5302         }
5303         return (op_err);
5304 }
5305
5306 static int
5307 sctp_are_there_new_addresses(struct sctp_association *asoc,
5308     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5309 {
5310         /*
5311          * Given a INIT packet, look through the packet to verify that there
5312          * are NO new addresses. As we go through the parameters add reports
5313          * of any un-understood parameters that require an error.  Also we
5314          * must return (1) to drop the packet if we see a un-understood
5315          * parameter that tells us to drop the chunk.
5316          */
5317         struct sockaddr *sa_touse;
5318         struct sockaddr *sa;
5319         struct sctp_paramhdr *phdr, params;
5320         uint16_t ptype, plen;
5321         uint8_t fnd;
5322         struct sctp_nets *net;
5323         int check_src;
5324 #ifdef INET
5325         struct sockaddr_in sin4, *sa4;
5326 #endif
5327 #ifdef INET6
5328         struct sockaddr_in6 sin6, *sa6;
5329 #endif
5330
5331 #ifdef INET
5332         memset(&sin4, 0, sizeof(sin4));
5333         sin4.sin_family = AF_INET;
5334         sin4.sin_len = sizeof(sin4);
5335 #endif
5336 #ifdef INET6
5337         memset(&sin6, 0, sizeof(sin6));
5338         sin6.sin6_family = AF_INET6;
5339         sin6.sin6_len = sizeof(sin6);
5340 #endif
5341         /* First what about the src address of the pkt ? */
5342         check_src = 0;
5343         switch (src->sa_family) {
5344 #ifdef INET
5345         case AF_INET:
5346                 if (asoc->scope.ipv4_addr_legal) {
5347                         check_src = 1;
5348                 }
5349                 break;
5350 #endif
5351 #ifdef INET6
5352         case AF_INET6:
5353                 if (asoc->scope.ipv6_addr_legal) {
5354                         check_src = 1;
5355                 }
5356                 break;
5357 #endif
5358         default:
5359                 /* TSNH */
5360                 break;
5361         }
5362         if (check_src) {
5363                 fnd = 0;
5364                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5365                         sa = (struct sockaddr *)&net->ro._l_addr;
5366                         if (sa->sa_family == src->sa_family) {
5367 #ifdef INET
5368                                 if (sa->sa_family == AF_INET) {
5369                                         struct sockaddr_in *src4;
5370
5371                                         sa4 = (struct sockaddr_in *)sa;
5372                                         src4 = (struct sockaddr_in *)src;
5373                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5374                                                 fnd = 1;
5375                                                 break;
5376                                         }
5377                                 }
5378 #endif
5379 #ifdef INET6
5380                                 if (sa->sa_family == AF_INET6) {
5381                                         struct sockaddr_in6 *src6;
5382
5383                                         sa6 = (struct sockaddr_in6 *)sa;
5384                                         src6 = (struct sockaddr_in6 *)src;
5385                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5386                                                 fnd = 1;
5387                                                 break;
5388                                         }
5389                                 }
5390 #endif
5391                         }
5392                 }
5393                 if (fnd == 0) {
5394                         /* New address added! no need to look further. */
5395                         return (1);
5396                 }
5397         }
5398         /* Ok so far lets munge through the rest of the packet */
5399         offset += sizeof(struct sctp_init_chunk);
5400         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5401         while (phdr) {
5402                 sa_touse = NULL;
5403                 ptype = ntohs(phdr->param_type);
5404                 plen = ntohs(phdr->param_length);
5405                 switch (ptype) {
5406 #ifdef INET
5407                 case SCTP_IPV4_ADDRESS:
5408                         {
5409                                 struct sctp_ipv4addr_param *p4, p4_buf;
5410
5411                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5412                                         return (1);
5413                                 }
5414                                 phdr = sctp_get_next_param(in_initpkt, offset,
5415                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5416                                 if (phdr == NULL) {
5417                                         return (1);
5418                                 }
5419                                 if (asoc->scope.ipv4_addr_legal) {
5420                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5421                                         sin4.sin_addr.s_addr = p4->addr;
5422                                         sa_touse = (struct sockaddr *)&sin4;
5423                                 }
5424                                 break;
5425                         }
5426 #endif
5427 #ifdef INET6
5428                 case SCTP_IPV6_ADDRESS:
5429                         {
5430                                 struct sctp_ipv6addr_param *p6, p6_buf;
5431
5432                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5433                                         return (1);
5434                                 }
5435                                 phdr = sctp_get_next_param(in_initpkt, offset,
5436                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5437                                 if (phdr == NULL) {
5438                                         return (1);
5439                                 }
5440                                 if (asoc->scope.ipv6_addr_legal) {
5441                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5442                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5443                                             sizeof(p6->addr));
5444                                         sa_touse = (struct sockaddr *)&sin6;
5445                                 }
5446                                 break;
5447                         }
5448 #endif
5449                 default:
5450                         sa_touse = NULL;
5451                         break;
5452                 }
5453                 if (sa_touse) {
5454                         /* ok, sa_touse points to one to check */
5455                         fnd = 0;
5456                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5457                                 sa = (struct sockaddr *)&net->ro._l_addr;
5458                                 if (sa->sa_family != sa_touse->sa_family) {
5459                                         continue;
5460                                 }
5461 #ifdef INET
5462                                 if (sa->sa_family == AF_INET) {
5463                                         sa4 = (struct sockaddr_in *)sa;
5464                                         if (sa4->sin_addr.s_addr ==
5465                                             sin4.sin_addr.s_addr) {
5466                                                 fnd = 1;
5467                                                 break;
5468                                         }
5469                                 }
5470 #endif
5471 #ifdef INET6
5472                                 if (sa->sa_family == AF_INET6) {
5473                                         sa6 = (struct sockaddr_in6 *)sa;
5474                                         if (SCTP6_ARE_ADDR_EQUAL(
5475                                             sa6, &sin6)) {
5476                                                 fnd = 1;
5477                                                 break;
5478                                         }
5479                                 }
5480 #endif
5481                         }
5482                         if (!fnd) {
5483                                 /* New addr added! no need to look further */
5484                                 return (1);
5485                         }
5486                 }
5487                 offset += SCTP_SIZE32(plen);
5488                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5489         }
5490         return (0);
5491 }
5492
5493 /*
5494  * Given a MBUF chain that was sent into us containing an INIT. Build a
5495  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5496  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5497  * message (i.e. the struct sctp_init_msg).
5498  */
5499 void
5500 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5501     struct sctp_nets *src_net, struct mbuf *init_pkt,
5502     int iphlen, int offset,
5503     struct sockaddr *src, struct sockaddr *dst,
5504     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5505     uint8_t mflowtype, uint32_t mflowid,
5506     uint32_t vrf_id, uint16_t port)
5507 {
5508         struct sctp_association *asoc;
5509         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5510         struct sctp_init_ack_chunk *initack;
5511         struct sctp_adaptation_layer_indication *ali;
5512         struct sctp_supported_chunk_types_param *pr_supported;
5513         struct sctp_paramhdr *ph;
5514         union sctp_sockstore *over_addr;
5515         struct sctp_scoping scp;
5516         struct timeval now;
5517 #ifdef INET
5518         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5519         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5520         struct sockaddr_in *sin;
5521 #endif
5522 #ifdef INET6
5523         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5524         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5525         struct sockaddr_in6 *sin6;
5526 #endif
5527         struct sockaddr *to;
5528         struct sctp_state_cookie stc;
5529         struct sctp_nets *net = NULL;
5530         uint8_t *signature = NULL;
5531         int cnt_inits_to = 0;
5532         uint16_t his_limit, i_want;
5533         int abort_flag;
5534         int nat_friendly = 0;
5535         int error;
5536         struct socket *so;
5537         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5538
5539         if (stcb) {
5540                 asoc = &stcb->asoc;
5541         } else {
5542                 asoc = NULL;
5543         }
5544         if ((asoc != NULL) &&
5545             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5546                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5547                         /*
5548                          * new addresses, out of here in non-cookie-wait
5549                          * states
5550                          *
5551                          * Send an ABORT, without the new address error
5552                          * cause. This looks no different than if no
5553                          * listener was present.
5554                          */
5555                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556                             "Address added");
5557                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5558                             mflowtype, mflowid, inp->fibnum,
5559                             vrf_id, port);
5560                         return;
5561                 }
5562                 if (src_net != NULL && (src_net->port != port)) {
5563                         /*
5564                          * change of remote encapsulation port, out of here
5565                          * in non-cookie-wait states
5566                          *
5567                          * Send an ABORT, without an specific error cause.
5568                          * This looks no different than if no listener was
5569                          * present.
5570                          */
5571                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5572                             "Remote encapsulation port changed");
5573                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5574                             mflowtype, mflowid, inp->fibnum,
5575                             vrf_id, port);
5576                         return;
5577                 }
5578         }
5579         abort_flag = 0;
5580         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5581             (offset + sizeof(struct sctp_init_chunk)),
5582             &abort_flag,
5583             (struct sctp_chunkhdr *)init_chk,
5584             &nat_friendly, NULL);
5585         if (abort_flag) {
5586 do_a_abort:
5587                 if (op_err == NULL) {
5588                         char msg[SCTP_DIAG_INFO_LEN];
5589
5590                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5591                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5592                             msg);
5593                 }
5594                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5595                     init_chk->init.initiate_tag, op_err,
5596                     mflowtype, mflowid, inp->fibnum,
5597                     vrf_id, port);
5598                 return;
5599         }
5600         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5601         if (m == NULL) {
5602                 /* No memory, INIT timer will re-attempt. */
5603                 sctp_m_freem(op_err);
5604                 return;
5605         }
5606         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5607         padding_len = 0;
5608
5609         /*
5610          * We might not overwrite the identification[] completely and on
5611          * some platforms time_entered will contain some padding. Therefore
5612          * zero out the cookie to avoid putting uninitialized memory on the
5613          * wire.
5614          */
5615         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5616
5617         /* the time I built cookie */
5618         (void)SCTP_GETTIME_TIMEVAL(&now);
5619         stc.time_entered.tv_sec = now.tv_sec;
5620         stc.time_entered.tv_usec = now.tv_usec;
5621
5622         /* populate any tie tags */
5623         if (asoc != NULL) {
5624                 /* unlock before tag selections */
5625                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5626                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5627                 stc.cookie_life = asoc->cookie_life;
5628                 net = asoc->primary_destination;
5629         } else {
5630                 stc.tie_tag_my_vtag = 0;
5631                 stc.tie_tag_peer_vtag = 0;
5632                 /* life I will award this cookie */
5633                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5634         }
5635
5636         /* copy in the ports for later check */
5637         stc.myport = sh->dest_port;
5638         stc.peerport = sh->src_port;
5639
5640         /*
5641          * If we wanted to honor cookie life extensions, we would add to
5642          * stc.cookie_life. For now we should NOT honor any extension
5643          */
5644         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5645         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5646                 stc.ipv6_addr_legal = 1;
5647                 if (SCTP_IPV6_V6ONLY(inp)) {
5648                         stc.ipv4_addr_legal = 0;
5649                 } else {
5650                         stc.ipv4_addr_legal = 1;
5651                 }
5652         } else {
5653                 stc.ipv6_addr_legal = 0;
5654                 stc.ipv4_addr_legal = 1;
5655         }
5656         stc.ipv4_scope = 0;
5657         if (net == NULL) {
5658                 to = src;
5659                 switch (dst->sa_family) {
5660 #ifdef INET
5661                 case AF_INET:
5662                         {
5663                                 /* lookup address */
5664                                 stc.address[0] = src4->sin_addr.s_addr;
5665                                 stc.address[1] = 0;
5666                                 stc.address[2] = 0;
5667                                 stc.address[3] = 0;
5668                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5669                                 /* local from address */
5670                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5671                                 stc.laddress[1] = 0;
5672                                 stc.laddress[2] = 0;
5673                                 stc.laddress[3] = 0;
5674                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5675                                 /* scope_id is only for v6 */
5676                                 stc.scope_id = 0;
5677                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5678                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5679                                         stc.ipv4_scope = 1;
5680                                 }
5681                                 /* Must use the address in this case */
5682                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5683                                         stc.loopback_scope = 1;
5684                                         stc.ipv4_scope = 1;
5685                                         stc.site_scope = 1;
5686                                         stc.local_scope = 0;
5687                                 }
5688                                 break;
5689                         }
5690 #endif
5691 #ifdef INET6
5692                 case AF_INET6:
5693                         {
5694                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5695                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5696                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5697                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5698                                         stc.loopback_scope = 1;
5699                                         stc.local_scope = 0;
5700                                         stc.site_scope = 1;
5701                                         stc.ipv4_scope = 1;
5702                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5703                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5704                                         /*
5705                                          * If the new destination or source
5706                                          * is a LINK_LOCAL we must have
5707                                          * common both site and local scope.
5708                                          * Don't set local scope though
5709                                          * since we must depend on the
5710                                          * source to be added implicitly. We
5711                                          * cannot assure just because we
5712                                          * share one link that all links are
5713                                          * common.
5714                                          */
5715                                         stc.local_scope = 0;
5716                                         stc.site_scope = 1;
5717                                         stc.ipv4_scope = 1;
5718                                         /*
5719                                          * we start counting for the private
5720                                          * address stuff at 1. since the
5721                                          * link local we source from won't
5722                                          * show up in our scoped count.
5723                                          */
5724                                         cnt_inits_to = 1;
5725                                         /*
5726                                          * pull out the scope_id from
5727                                          * incoming pkt
5728                                          */
5729                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5730                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5731                                         /*
5732                                          * If the new destination or source
5733                                          * is SITE_LOCAL then we must have
5734                                          * site scope in common.
5735                                          */
5736                                         stc.site_scope = 1;
5737                                 }
5738                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5739                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5740                                 break;
5741                         }
5742 #endif
5743                 default:
5744                         /* TSNH */
5745                         goto do_a_abort;
5746                         break;
5747                 }
5748         } else {
5749                 /* set the scope per the existing tcb */
5750
5751 #ifdef INET6
5752                 struct sctp_nets *lnet;
5753 #endif
5754
5755                 stc.loopback_scope = asoc->scope.loopback_scope;
5756                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5757                 stc.site_scope = asoc->scope.site_scope;
5758                 stc.local_scope = asoc->scope.local_scope;
5759 #ifdef INET6
5760                 /* Why do we not consider IPv4 LL addresses? */
5761                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5762                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5763                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5764                                         /*
5765                                          * if we have a LL address, start
5766                                          * counting at 1.
5767                                          */
5768                                         cnt_inits_to = 1;
5769                                 }
5770                         }
5771                 }
5772 #endif
5773                 /* use the net pointer */
5774                 to = (struct sockaddr *)&net->ro._l_addr;
5775                 switch (to->sa_family) {
5776 #ifdef INET
5777                 case AF_INET:
5778                         sin = (struct sockaddr_in *)to;
5779                         stc.address[0] = sin->sin_addr.s_addr;
5780                         stc.address[1] = 0;
5781                         stc.address[2] = 0;
5782                         stc.address[3] = 0;
5783                         stc.addr_type = SCTP_IPV4_ADDRESS;
5784                         if (net->src_addr_selected == 0) {
5785                                 /*
5786                                  * strange case here, the INIT should have
5787                                  * did the selection.
5788                                  */
5789                                 net->ro._s_addr = sctp_source_address_selection(inp,
5790                                     stcb, (sctp_route_t *)&net->ro,
5791                                     net, 0, vrf_id);
5792                                 if (net->ro._s_addr == NULL) {
5793                                         sctp_m_freem(op_err);
5794                                         sctp_m_freem(m);
5795                                         return;
5796                                 }
5797
5798                                 net->src_addr_selected = 1;
5799
5800                         }
5801                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5802                         stc.laddress[1] = 0;
5803                         stc.laddress[2] = 0;
5804                         stc.laddress[3] = 0;
5805                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5806                         /* scope_id is only for v6 */
5807                         stc.scope_id = 0;
5808                         break;
5809 #endif
5810 #ifdef INET6
5811                 case AF_INET6:
5812                         sin6 = (struct sockaddr_in6 *)to;
5813                         memcpy(&stc.address, &sin6->sin6_addr,
5814                             sizeof(struct in6_addr));
5815                         stc.addr_type = SCTP_IPV6_ADDRESS;
5816                         stc.scope_id = sin6->sin6_scope_id;
5817                         if (net->src_addr_selected == 0) {
5818                                 /*
5819                                  * strange case here, the INIT should have
5820                                  * done the selection.
5821                                  */
5822                                 net->ro._s_addr = sctp_source_address_selection(inp,
5823                                     stcb, (sctp_route_t *)&net->ro,
5824                                     net, 0, vrf_id);
5825                                 if (net->ro._s_addr == NULL) {
5826                                         sctp_m_freem(op_err);
5827                                         sctp_m_freem(m);
5828                                         return;
5829                                 }
5830
5831                                 net->src_addr_selected = 1;
5832                         }
5833                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5834                             sizeof(struct in6_addr));
5835                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5836                         break;
5837 #endif
5838                 }
5839         }
5840         /* Now lets put the SCTP header in place */
5841         initack = mtod(m, struct sctp_init_ack_chunk *);
5842         /* Save it off for quick ref */
5843         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5844         /* who are we */
5845         memcpy(stc.identification, SCTP_VERSION_STRING,
5846             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5847         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5848         /* now the chunk header */
5849         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5850         initack->ch.chunk_flags = 0;
5851         /* fill in later from mbuf we build */
5852         initack->ch.chunk_length = 0;
5853         /* place in my tag */
5854         if ((asoc != NULL) &&
5855             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5856             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5857             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5858                 /* re-use the v-tags and init-seq here */
5859                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5860                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5861         } else {
5862                 uint32_t vtag, itsn;
5863
5864                 if (asoc) {
5865                         atomic_add_int(&asoc->refcnt, 1);
5866                         SCTP_TCB_UNLOCK(stcb);
5867         new_tag:
5868                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5869                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5870                                 /*
5871                                  * Got a duplicate vtag on some guy behind a
5872                                  * nat make sure we don't use it.
5873                                  */
5874                                 goto new_tag;
5875                         }
5876                         initack->init.initiate_tag = htonl(vtag);
5877                         /* get a TSN to use too */
5878                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5879                         initack->init.initial_tsn = htonl(itsn);
5880                         SCTP_TCB_LOCK(stcb);
5881                         atomic_add_int(&asoc->refcnt, -1);
5882                 } else {
5883                         SCTP_INP_INCR_REF(inp);
5884                         SCTP_INP_RUNLOCK(inp);
5885                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5886                         initack->init.initiate_tag = htonl(vtag);
5887                         /* get a TSN to use too */
5888                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5889                         SCTP_INP_RLOCK(inp);
5890                         SCTP_INP_DECR_REF(inp);
5891                 }
5892         }
5893         /* save away my tag to */
5894         stc.my_vtag = initack->init.initiate_tag;
5895
5896         /* set up some of the credits. */
5897         so = inp->sctp_socket;
5898         if (so == NULL) {
5899                 /* memory problem */
5900                 sctp_m_freem(op_err);
5901                 sctp_m_freem(m);
5902                 return;
5903         } else {
5904                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5905         }
5906         /* set what I want */
5907         his_limit = ntohs(init_chk->init.num_inbound_streams);
5908         /* choose what I want */
5909         if (asoc != NULL) {
5910                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5911                         i_want = asoc->streamoutcnt;
5912                 } else {
5913                         i_want = asoc->pre_open_streams;
5914                 }
5915         } else {
5916                 i_want = inp->sctp_ep.pre_open_stream_count;
5917         }
5918         if (his_limit < i_want) {
5919                 /* I Want more :< */
5920                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5921         } else {
5922                 /* I can have what I want :> */
5923                 initack->init.num_outbound_streams = htons(i_want);
5924         }
5925         /* tell him his limit. */
5926         initack->init.num_inbound_streams =
5927             htons(inp->sctp_ep.max_open_streams_intome);
5928
5929         /* adaptation layer indication parameter */
5930         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5931                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5932                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5933                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5934                 ali->ph.param_length = htons(parameter_len);
5935                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5936                 chunk_len += parameter_len;
5937         }
5938
5939         /* ECN parameter */
5940         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5941             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5942                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5943                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5944                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5945                 ph->param_length = htons(parameter_len);
5946                 chunk_len += parameter_len;
5947         }
5948
5949         /* PR-SCTP supported parameter */
5950         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5951             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5952                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5953                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5954                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5955                 ph->param_length = htons(parameter_len);
5956                 chunk_len += parameter_len;
5957         }
5958
5959         /* Add NAT friendly parameter */
5960         if (nat_friendly) {
5961                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5962                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5963                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5964                 ph->param_length = htons(parameter_len);
5965                 chunk_len += parameter_len;
5966         }
5967
5968         /* And now tell the peer which extensions we support */
5969         num_ext = 0;
5970         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5971         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5972             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5973                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5974                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5975                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5976                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5977                 }
5978         }
5979         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5980             ((asoc == NULL) && (inp->auth_supported == 1))) {
5981                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5982         }
5983         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5984             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5985                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5986                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5987         }
5988         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5989             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5990                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5991         }
5992         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5993             ((asoc == NULL) && (inp->idata_supported == 1))) {
5994                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5995         }
5996         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5997             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5998                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5999         }
6000         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
6001             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
6002                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
6003         }
6004         if (num_ext > 0) {
6005                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
6006                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
6007                 pr_supported->ph.param_length = htons(parameter_len);
6008                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6009                 chunk_len += parameter_len;
6010         }
6011
6012         /* add authentication parameters */
6013         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6014             ((asoc == NULL) && (inp->auth_supported == 1))) {
6015                 struct sctp_auth_random *randp;
6016                 struct sctp_auth_hmac_algo *hmacs;
6017                 struct sctp_auth_chunk_list *chunks;
6018
6019                 if (padding_len > 0) {
6020                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6021                         chunk_len += padding_len;
6022                         padding_len = 0;
6023                 }
6024                 /* generate and add RANDOM parameter */
6025                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6026                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6027                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6028                 randp->ph.param_type = htons(SCTP_RANDOM);
6029                 randp->ph.param_length = htons(parameter_len);
6030                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6031                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6032                 chunk_len += parameter_len;
6033
6034                 if (padding_len > 0) {
6035                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6036                         chunk_len += padding_len;
6037                         padding_len = 0;
6038                 }
6039                 /* add HMAC_ALGO parameter */
6040                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6041                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6042                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6043                     (uint8_t *)hmacs->hmac_ids);
6044                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6045                 hmacs->ph.param_length = htons(parameter_len);
6046                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6047                 chunk_len += parameter_len;
6048
6049                 if (padding_len > 0) {
6050                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6051                         chunk_len += padding_len;
6052                         padding_len = 0;
6053                 }
6054                 /* add CHUNKS parameter */
6055                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6056                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6057                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6058                     chunks->chunk_types);
6059                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6060                 chunks->ph.param_length = htons(parameter_len);
6061                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6062                 chunk_len += parameter_len;
6063         }
6064         SCTP_BUF_LEN(m) = chunk_len;
6065         m_last = m;
6066         /* now the addresses */
6067         /*
6068          * To optimize this we could put the scoping stuff into a structure
6069          * and remove the individual uint8's from the stc structure. Then we
6070          * could just sifa in the address within the stc.. but for now this
6071          * is a quick hack to get the address stuff teased apart.
6072          */
6073         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6074         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6075         scp.loopback_scope = stc.loopback_scope;
6076         scp.ipv4_local_scope = stc.ipv4_scope;
6077         scp.local_scope = stc.local_scope;
6078         scp.site_scope = stc.site_scope;
6079         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6080             cnt_inits_to,
6081             &padding_len, &chunk_len);
6082         /* padding_len can only be positive, if no addresses have been added */
6083         if (padding_len > 0) {
6084                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6085                 chunk_len += padding_len;
6086                 SCTP_BUF_LEN(m) += padding_len;
6087                 padding_len = 0;
6088         }
6089
6090         /* tack on the operational error if present */
6091         if (op_err) {
6092                 parameter_len = 0;
6093                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6094                         parameter_len += SCTP_BUF_LEN(m_tmp);
6095                 }
6096                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6097                 SCTP_BUF_NEXT(m_last) = op_err;
6098                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6099                         m_last = SCTP_BUF_NEXT(m_last);
6100                 }
6101                 chunk_len += parameter_len;
6102         }
6103         if (padding_len > 0) {
6104                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6105                 if (m_last == NULL) {
6106                         /* Houston we have a problem, no space */
6107                         sctp_m_freem(m);
6108                         return;
6109                 }
6110                 chunk_len += padding_len;
6111                 padding_len = 0;
6112         }
6113         /* Now we must build a cookie */
6114         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6115         if (m_cookie == NULL) {
6116                 /* memory problem */
6117                 sctp_m_freem(m);
6118                 return;
6119         }
6120         /* Now append the cookie to the end and update the space/size */
6121         SCTP_BUF_NEXT(m_last) = m_cookie;
6122         parameter_len = 0;
6123         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6124                 parameter_len += SCTP_BUF_LEN(m_tmp);
6125                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6126                         m_last = m_tmp;
6127                 }
6128         }
6129         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6130         chunk_len += parameter_len;
6131
6132         /*
6133          * Place in the size, but we don't include the last pad (if any) in
6134          * the INIT-ACK.
6135          */
6136         initack->ch.chunk_length = htons(chunk_len);
6137
6138         /*
6139          * Time to sign the cookie, we don't sign over the cookie signature
6140          * though thus we set trailer.
6141          */
6142         (void)sctp_hmac_m(SCTP_HMAC,
6143             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6144             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6145             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6146         /*
6147          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6148          * here since the timer will drive a retranmission.
6149          */
6150         if (padding_len > 0) {
6151                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6152                         sctp_m_freem(m);
6153                         return;
6154                 }
6155         }
6156         if (stc.loopback_scope) {
6157                 over_addr = (union sctp_sockstore *)dst;
6158         } else {
6159                 over_addr = NULL;
6160         }
6161
6162         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6163             0, 0,
6164             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6165             port, over_addr,
6166             mflowtype, mflowid,
6167             SCTP_SO_NOT_LOCKED))) {
6168                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6169                 if (error == ENOBUFS) {
6170                         if (asoc != NULL) {
6171                                 asoc->ifp_had_enobuf = 1;
6172                         }
6173                         SCTP_STAT_INCR(sctps_lowlevelerr);
6174                 }
6175         } else {
6176                 if (asoc != NULL) {
6177                         asoc->ifp_had_enobuf = 0;
6178                 }
6179         }
6180         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6181 }
6182
6183
6184 static void
6185 sctp_prune_prsctp(struct sctp_tcb *stcb,
6186     struct sctp_association *asoc,
6187     struct sctp_sndrcvinfo *srcv,
6188     int dataout)
6189 {
6190         int freed_spc = 0;
6191         struct sctp_tmit_chunk *chk, *nchk;
6192
6193         SCTP_TCB_LOCK_ASSERT(stcb);
6194         if ((asoc->prsctp_supported) &&
6195             (asoc->sent_queue_cnt_removeable > 0)) {
6196                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6197                         /*
6198                          * Look for chunks marked with the PR_SCTP flag AND
6199                          * the buffer space flag. If the one being sent is
6200                          * equal or greater priority then purge the old one
6201                          * and free some space.
6202                          */
6203                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6204                                 /*
6205                                  * This one is PR-SCTP AND buffer space
6206                                  * limited type
6207                                  */
6208                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6209                                         /*
6210                                          * Lower numbers equates to higher
6211                                          * priority so if the one we are
6212                                          * looking at has a larger or equal
6213                                          * priority we want to drop the data
6214                                          * and NOT retransmit it.
6215                                          */
6216                                         if (chk->data) {
6217                                                 /*
6218                                                  * We release the book_size
6219                                                  * if the mbuf is here
6220                                                  */
6221                                                 int ret_spc;
6222                                                 uint8_t sent;
6223
6224                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6225                                                         sent = 1;
6226                                                 else
6227                                                         sent = 0;
6228                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6229                                                     sent,
6230                                                     SCTP_SO_LOCKED);
6231                                                 freed_spc += ret_spc;
6232                                                 if (freed_spc >= dataout) {
6233                                                         return;
6234                                                 }
6235                                         }       /* if chunk was present */
6236                                 }       /* if of sufficient priority */
6237                         }       /* if chunk has enabled */
6238                 }               /* tailqforeach */
6239
6240                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6241                         /* Here we must move to the sent queue and mark */
6242                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6243                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6244                                         if (chk->data) {
6245                                                 /*
6246                                                  * We release the book_size
6247                                                  * if the mbuf is here
6248                                                  */
6249                                                 int ret_spc;
6250
6251                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6252                                                     0, SCTP_SO_LOCKED);
6253
6254                                                 freed_spc += ret_spc;
6255                                                 if (freed_spc >= dataout) {
6256                                                         return;
6257                                                 }
6258                                         }       /* end if chk->data */
6259                                 }       /* end if right class */
6260                         }       /* end if chk pr-sctp */
6261                 }               /* tailqforeachsafe (chk) */
6262         }                       /* if enabled in asoc */
6263 }
6264
6265 int
6266 sctp_get_frag_point(struct sctp_tcb *stcb,
6267     struct sctp_association *asoc)
6268 {
6269         int siz, ovh;
6270
6271         /*
6272          * For endpoints that have both v6 and v4 addresses we must reserve
6273          * room for the ipv6 header, for those that are only dealing with V4
6274          * we use a larger frag point.
6275          */
6276         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6277                 ovh = SCTP_MIN_OVERHEAD;
6278         } else {
6279                 ovh = SCTP_MIN_V4_OVERHEAD;
6280         }
6281         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6282         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6283                 siz = asoc->smallest_mtu - ovh;
6284         else
6285                 siz = (stcb->asoc.sctp_frag_point - ovh);
6286         /*
6287          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6288          */
6289         /* A data chunk MUST fit in a cluster */
6290         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6291         /* } */
6292
6293         /* adjust for an AUTH chunk if DATA requires auth */
6294         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6295                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6296
6297         if (siz % 4) {
6298                 /* make it an even word boundary please */
6299                 siz -= (siz % 4);
6300         }
6301         return (siz);
6302 }
6303
6304 static void
6305 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6306 {
6307         /*
6308          * We assume that the user wants PR_SCTP_TTL if the user provides a
6309          * positive lifetime but does not specify any PR_SCTP policy.
6310          */
6311         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6312                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6313         } else if (sp->timetolive > 0) {
6314                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6315                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6316         } else {
6317                 return;
6318         }
6319         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6320         case CHUNK_FLAGS_PR_SCTP_BUF:
6321                 /*
6322                  * Time to live is a priority stored in tv_sec when doing
6323                  * the buffer drop thing.
6324                  */
6325                 sp->ts.tv_sec = sp->timetolive;
6326                 sp->ts.tv_usec = 0;
6327                 break;
6328         case CHUNK_FLAGS_PR_SCTP_TTL:
6329                 {
6330                         struct timeval tv;
6331
6332                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6333                         tv.tv_sec = sp->timetolive / 1000;
6334                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6335                         /*
6336                          * TODO sctp_constants.h needs alternative time
6337                          * macros when _KERNEL is undefined.
6338                          */
6339                         timevaladd(&sp->ts, &tv);
6340                 }
6341                 break;
6342         case CHUNK_FLAGS_PR_SCTP_RTX:
6343                 /*
6344                  * Time to live is a the number or retransmissions stored in
6345                  * tv_sec.
6346                  */
6347                 sp->ts.tv_sec = sp->timetolive;
6348                 sp->ts.tv_usec = 0;
6349                 break;
6350         default:
6351                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6352                     "Unknown PR_SCTP policy %u.\n",
6353                     PR_SCTP_POLICY(sp->sinfo_flags));
6354                 break;
6355         }
6356 }
6357
6358 static int
6359 sctp_msg_append(struct sctp_tcb *stcb,
6360     struct sctp_nets *net,
6361     struct mbuf *m,
6362     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6363 {
6364         int error = 0;
6365         struct mbuf *at;
6366         struct sctp_stream_queue_pending *sp = NULL;
6367         struct sctp_stream_out *strm;
6368
6369         /*
6370          * Given an mbuf chain, put it into the association send queue and
6371          * place it on the wheel
6372          */
6373         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6374                 /* Invalid stream number */
6375                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6376                 error = EINVAL;
6377                 goto out_now;
6378         }
6379         if ((stcb->asoc.stream_locked) &&
6380             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6381                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6382                 error = EINVAL;
6383                 goto out_now;
6384         }
6385         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6386         /* Now can we send this? */
6387         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6388             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6389             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6390             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6391                 /* got data while shutting down */
6392                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6393                 error = ECONNRESET;
6394                 goto out_now;
6395         }
6396         sctp_alloc_a_strmoq(stcb, sp);
6397         if (sp == NULL) {
6398                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6399                 error = ENOMEM;
6400                 goto out_now;
6401         }
6402         sp->sinfo_flags = srcv->sinfo_flags;
6403         sp->timetolive = srcv->sinfo_timetolive;
6404         sp->ppid = srcv->sinfo_ppid;
6405         sp->context = srcv->sinfo_context;
6406         sp->fsn = 0;
6407         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6408                 sp->net = net;
6409                 atomic_add_int(&sp->net->ref_count, 1);
6410         } else {
6411                 sp->net = NULL;
6412         }
6413         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6414         sp->sid = srcv->sinfo_stream;
6415         sp->msg_is_complete = 1;
6416         sp->sender_all_done = 1;
6417         sp->some_taken = 0;
6418         sp->data = m;
6419         sp->tail_mbuf = NULL;
6420         sctp_set_prsctp_policy(sp);
6421         /*
6422          * We could in theory (for sendall) sifa the length in, but we would
6423          * still have to hunt through the chain since we need to setup the
6424          * tail_mbuf
6425          */
6426         sp->length = 0;
6427         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6428                 if (SCTP_BUF_NEXT(at) == NULL)
6429                         sp->tail_mbuf = at;
6430                 sp->length += SCTP_BUF_LEN(at);
6431         }
6432         if (srcv->sinfo_keynumber_valid) {
6433                 sp->auth_keyid = srcv->sinfo_keynumber;
6434         } else {
6435                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6436         }
6437         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6438                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6439                 sp->holds_key_ref = 1;
6440         }
6441         if (hold_stcb_lock == 0) {
6442                 SCTP_TCB_SEND_LOCK(stcb);
6443         }
6444         sctp_snd_sb_alloc(stcb, sp->length);
6445         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6446         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6447         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6448         m = NULL;
6449         if (hold_stcb_lock == 0) {
6450                 SCTP_TCB_SEND_UNLOCK(stcb);
6451         }
6452 out_now:
6453         if (m) {
6454                 sctp_m_freem(m);
6455         }
6456         return (error);
6457 }
6458
6459
6460 static struct mbuf *
6461 sctp_copy_mbufchain(struct mbuf *clonechain,
6462     struct mbuf *outchain,
6463     struct mbuf **endofchain,
6464     int can_take_mbuf,
6465     int sizeofcpy,
6466     uint8_t copy_by_ref)
6467 {
6468         struct mbuf *m;
6469         struct mbuf *appendchain;
6470         caddr_t cp;
6471         int len;
6472
6473         if (endofchain == NULL) {
6474                 /* error */
6475 error_out:
6476                 if (outchain)
6477                         sctp_m_freem(outchain);
6478                 return (NULL);
6479         }
6480         if (can_take_mbuf) {
6481                 appendchain = clonechain;
6482         } else {
6483                 if (!copy_by_ref &&
6484                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6485                     ) {
6486                         /* Its not in a cluster */
6487                         if (*endofchain == NULL) {
6488                                 /* lets get a mbuf cluster */
6489                                 if (outchain == NULL) {
6490                                         /* This is the general case */
6491                         new_mbuf:
6492                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6493                                         if (outchain == NULL) {
6494                                                 goto error_out;
6495                                         }
6496                                         SCTP_BUF_LEN(outchain) = 0;
6497                                         *endofchain = outchain;
6498                                         /* get the prepend space */
6499                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6500                                 } else {
6501                                         /*
6502                                          * We really should not get a NULL
6503                                          * in endofchain
6504                                          */
6505                                         /* find end */
6506                                         m = outchain;
6507                                         while (m) {
6508                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6509                                                         *endofchain = m;
6510                                                         break;
6511                                                 }
6512                                                 m = SCTP_BUF_NEXT(m);
6513                                         }
6514                                         /* sanity */
6515                                         if (*endofchain == NULL) {
6516                                                 /*
6517                                                  * huh, TSNH XXX maybe we
6518                                                  * should panic
6519                                                  */
6520                                                 sctp_m_freem(outchain);
6521                                                 goto new_mbuf;
6522                                         }
6523                                 }
6524                                 /* get the new end of length */
6525                                 len = (int)M_TRAILINGSPACE(*endofchain);
6526                         } else {
6527                                 /* how much is left at the end? */
6528                                 len = (int)M_TRAILINGSPACE(*endofchain);
6529                         }
6530                         /* Find the end of the data, for appending */
6531                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6532
6533                         /* Now lets copy it out */
6534                         if (len >= sizeofcpy) {
6535                                 /* It all fits, copy it in */
6536                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6537                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6538                         } else {
6539                                 /* fill up the end of the chain */
6540                                 if (len > 0) {
6541                                         m_copydata(clonechain, 0, len, cp);
6542                                         SCTP_BUF_LEN((*endofchain)) += len;
6543                                         /* now we need another one */
6544                                         sizeofcpy -= len;
6545                                 }
6546                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6547                                 if (m == NULL) {
6548                                         /* We failed */
6549                                         goto error_out;
6550                                 }
6551                                 SCTP_BUF_NEXT((*endofchain)) = m;
6552                                 *endofchain = m;
6553                                 cp = mtod((*endofchain), caddr_t);
6554                                 m_copydata(clonechain, len, sizeofcpy, cp);
6555                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6556                         }
6557                         return (outchain);
6558                 } else {
6559                         /* copy the old fashion way */
6560                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6561 #ifdef SCTP_MBUF_LOGGING
6562                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6563                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6564                         }
6565 #endif
6566                 }
6567         }
6568         if (appendchain == NULL) {
6569                 /* error */
6570                 if (outchain)
6571                         sctp_m_freem(outchain);
6572                 return (NULL);
6573         }
6574         if (outchain) {
6575                 /* tack on to the end */
6576                 if (*endofchain != NULL) {
6577                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6578                 } else {
6579                         m = outchain;
6580                         while (m) {
6581                                 if (SCTP_BUF_NEXT(m) == NULL) {
6582                                         SCTP_BUF_NEXT(m) = appendchain;
6583                                         break;
6584                                 }
6585                                 m = SCTP_BUF_NEXT(m);
6586                         }
6587                 }
6588                 /*
6589                  * save off the end and update the end-chain position
6590                  */
6591                 m = appendchain;
6592                 while (m) {
6593                         if (SCTP_BUF_NEXT(m) == NULL) {
6594                                 *endofchain = m;
6595                                 break;
6596                         }
6597                         m = SCTP_BUF_NEXT(m);
6598                 }
6599                 return (outchain);
6600         } else {
6601                 /* save off the end and update the end-chain position */
6602                 m = appendchain;
6603                 while (m) {
6604                         if (SCTP_BUF_NEXT(m) == NULL) {
6605                                 *endofchain = m;
6606                                 break;
6607                         }
6608                         m = SCTP_BUF_NEXT(m);
6609                 }
6610                 return (appendchain);
6611         }
6612 }
6613
6614 static int
6615 sctp_med_chunk_output(struct sctp_inpcb *inp,
6616     struct sctp_tcb *stcb,
6617     struct sctp_association *asoc,
6618     int *num_out,
6619     int *reason_code,
6620     int control_only, int from_where,
6621     struct timeval *now, int *now_filled, int frag_point, int so_locked
6622 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6623     SCTP_UNUSED
6624 #endif
6625 );
6626
6627 static void
6628 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6629     uint32_t val SCTP_UNUSED)
6630 {
6631         struct sctp_copy_all *ca;
6632         struct mbuf *m;
6633         int ret = 0;
6634         int added_control = 0;
6635         int un_sent, do_chunk_output = 1;
6636         struct sctp_association *asoc;
6637         struct sctp_nets *net;
6638
6639         ca = (struct sctp_copy_all *)ptr;
6640         if (ca->m == NULL) {
6641                 return;
6642         }
6643         if (ca->inp != inp) {
6644                 /* TSNH */
6645                 return;
6646         }
6647         if (ca->sndlen > 0) {
6648                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6649                 if (m == NULL) {
6650                         /* can't copy so we are done */
6651                         ca->cnt_failed++;
6652                         return;
6653                 }
6654 #ifdef SCTP_MBUF_LOGGING
6655                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6656                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6657                 }
6658 #endif
6659         } else {
6660                 m = NULL;
6661         }
6662         SCTP_TCB_LOCK_ASSERT(stcb);
6663         if (stcb->asoc.alternate) {
6664                 net = stcb->asoc.alternate;
6665         } else {
6666                 net = stcb->asoc.primary_destination;
6667         }
6668         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6669                 /* Abort this assoc with m as the user defined reason */
6670                 if (m != NULL) {
6671                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6672                 } else {
6673                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6674                             0, M_NOWAIT, 1, MT_DATA);
6675                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6676                 }
6677                 if (m != NULL) {
6678                         struct sctp_paramhdr *ph;
6679
6680                         ph = mtod(m, struct sctp_paramhdr *);
6681                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6682                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6683                 }
6684                 /*
6685                  * We add one here to keep the assoc from dis-appearing on
6686                  * us.
6687                  */
6688                 atomic_add_int(&stcb->asoc.refcnt, 1);
6689                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6690                 /*
6691                  * sctp_abort_an_association calls sctp_free_asoc() free
6692                  * association will NOT free it since we incremented the
6693                  * refcnt .. we do this to prevent it being freed and things
6694                  * getting tricky since we could end up (from free_asoc)
6695                  * calling inpcb_free which would get a recursive lock call
6696                  * to the iterator lock.. But as a consequence of that the
6697                  * stcb will return to us un-locked.. since free_asoc
6698                  * returns with either no TCB or the TCB unlocked, we must
6699                  * relock.. to unlock in the iterator timer :-0
6700                  */
6701                 SCTP_TCB_LOCK(stcb);
6702                 atomic_add_int(&stcb->asoc.refcnt, -1);
6703                 goto no_chunk_output;
6704         } else {
6705                 if (m) {
6706                         ret = sctp_msg_append(stcb, net, m,
6707                             &ca->sndrcv, 1);
6708                 }
6709                 asoc = &stcb->asoc;
6710                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6711                         /* shutdown this assoc */
6712                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6713                             TAILQ_EMPTY(&asoc->sent_queue) &&
6714                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6715                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6716                                         goto abort_anyway;
6717                                 }
6718                                 /*
6719                                  * there is nothing queued to send, so I'm
6720                                  * done...
6721                                  */
6722                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6723                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6724                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6725                                         /*
6726                                          * only send SHUTDOWN the first time
6727                                          * through
6728                                          */
6729                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6730                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6731                                         }
6732                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6733                                         sctp_stop_timers_for_shutdown(stcb);
6734                                         sctp_send_shutdown(stcb, net);
6735                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6736                                             net);
6737                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6738                                             asoc->primary_destination);
6739                                         added_control = 1;
6740                                         do_chunk_output = 0;
6741                                 }
6742                         } else {
6743                                 /*
6744                                  * we still got (or just got) data to send,
6745                                  * so set SHUTDOWN_PENDING
6746                                  */
6747                                 /*
6748                                  * XXX sockets draft says that SCTP_EOF
6749                                  * should be sent with no data.  currently,
6750                                  * we will allow user data to be sent first
6751                                  * and move to SHUTDOWN-PENDING
6752                                  */
6753                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6754                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6755                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6756                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6757                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6758                                         }
6759                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6760                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6761                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6762                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6763                                                 struct mbuf *op_err;
6764                                                 char msg[SCTP_DIAG_INFO_LEN];
6765
6766                                 abort_anyway:
6767                                                 snprintf(msg, sizeof(msg),
6768                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6769                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6770                                                     msg);
6771                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6772                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6773                                                     op_err, SCTP_SO_NOT_LOCKED);
6774                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6775                                                 goto no_chunk_output;
6776                                         }
6777                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6778                                             asoc->primary_destination);
6779                                 }
6780                         }
6781
6782                 }
6783         }
6784         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6785             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6786
6787         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6788             (stcb->asoc.total_flight > 0) &&
6789             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6790                 do_chunk_output = 0;
6791         }
6792         if (do_chunk_output)
6793                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6794         else if (added_control) {
6795                 int num_out, reason, now_filled = 0;
6796                 struct timeval now;
6797                 int frag_point;
6798
6799                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6800                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6801                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6802         }
6803 no_chunk_output:
6804         if (ret) {
6805                 ca->cnt_failed++;
6806         } else {
6807                 ca->cnt_sent++;
6808         }
6809 }
6810
6811 static void
6812 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6813 {
6814         struct sctp_copy_all *ca;
6815
6816         ca = (struct sctp_copy_all *)ptr;
6817         /*
6818          * Do a notify here? Kacheong suggests that the notify be done at
6819          * the send time.. so you would push up a notification if any send
6820          * failed. Don't know if this is feasible since the only failures we
6821          * have is "memory" related and if you cannot get an mbuf to send
6822          * the data you surely can't get an mbuf to send up to notify the
6823          * user you can't send the data :->
6824          */
6825
6826         /* now free everything */
6827         if (ca->inp) {
6828                 /* Lets clear the flag to allow others to run. */
6829                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6830         }
6831         sctp_m_freem(ca->m);
6832         SCTP_FREE(ca, SCTP_M_COPYAL);
6833 }
6834
6835 static struct mbuf *
6836 sctp_copy_out_all(struct uio *uio, ssize_t len)
6837 {
6838         struct mbuf *ret, *at;
6839         ssize_t left, willcpy, cancpy, error;
6840
6841         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6842         if (ret == NULL) {
6843                 /* TSNH */
6844                 return (NULL);
6845         }
6846         left = len;
6847         SCTP_BUF_LEN(ret) = 0;
6848         /* save space for the data chunk header */
6849         cancpy = (int)M_TRAILINGSPACE(ret);
6850         willcpy = min(cancpy, left);
6851         at = ret;
6852         while (left > 0) {
6853                 /* Align data to the end */
6854                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6855                 if (error) {
6856         err_out_now:
6857                         sctp_m_freem(at);
6858                         return (NULL);
6859                 }
6860                 SCTP_BUF_LEN(at) = (int)willcpy;
6861                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6862                 left -= willcpy;
6863                 if (left > 0) {
6864                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6865                         if (SCTP_BUF_NEXT(at) == NULL) {
6866                                 goto err_out_now;
6867                         }
6868                         at = SCTP_BUF_NEXT(at);
6869                         SCTP_BUF_LEN(at) = 0;
6870                         cancpy = (int)M_TRAILINGSPACE(at);
6871                         willcpy = min(cancpy, left);
6872                 }
6873         }
6874         return (ret);
6875 }
6876
6877 static int
6878 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6879     struct sctp_sndrcvinfo *srcv)
6880 {
6881         int ret;
6882         struct sctp_copy_all *ca;
6883
6884         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6885                 /* There is another. */
6886                 return (EBUSY);
6887         }
6888         if (uio->uio_resid > SCTP_MAX_SENDALL_LIMIT) {
6889                 /* You must be less than the max! */
6890                 return (EMSGSIZE);
6891         }
6892         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6893             SCTP_M_COPYAL);
6894         if (ca == NULL) {
6895                 sctp_m_freem(m);
6896                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6897                 return (ENOMEM);
6898         }
6899         memset(ca, 0, sizeof(struct sctp_copy_all));
6900
6901         ca->inp = inp;
6902         if (srcv) {
6903                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6904         }
6905         /*
6906          * take off the sendall flag, it would be bad if we failed to do
6907          * this :-0
6908          */
6909         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6910         /* get length and mbuf chain */
6911         if (uio) {
6912                 ca->sndlen = uio->uio_resid;
6913                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6914                 if (ca->m == NULL) {
6915                         SCTP_FREE(ca, SCTP_M_COPYAL);
6916                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6917                         return (ENOMEM);
6918                 }
6919         } else {
6920                 /* Gather the length of the send */
6921                 struct mbuf *mat;
6922
6923                 ca->sndlen = 0;
6924                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6925                         ca->sndlen += SCTP_BUF_LEN(mat);
6926                 }
6927         }
6928         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6929         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6930             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6931             SCTP_ASOC_ANY_STATE,
6932             (void *)ca, 0,
6933             sctp_sendall_completes, inp, 1);
6934         if (ret) {
6935                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6936                 SCTP_FREE(ca, SCTP_M_COPYAL);
6937                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6938                 return (EFAULT);
6939         }
6940         return (0);
6941 }
6942
6943
6944 void
6945 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6946 {
6947         struct sctp_tmit_chunk *chk, *nchk;
6948
6949         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6950                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6951                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6952                         asoc->ctrl_queue_cnt--;
6953                         if (chk->data) {
6954                                 sctp_m_freem(chk->data);
6955                                 chk->data = NULL;
6956                         }
6957                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6958                 }
6959         }
6960 }
6961
6962 void
6963 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6964 {
6965         struct sctp_association *asoc;
6966         struct sctp_tmit_chunk *chk, *nchk;
6967         struct sctp_asconf_chunk *acp;
6968
6969         asoc = &stcb->asoc;
6970         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6971                 /* find SCTP_ASCONF chunk in queue */
6972                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6973                         if (chk->data) {
6974                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6975                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6976                                         /* Not Acked yet */
6977                                         break;
6978                                 }
6979                         }
6980                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6981                         asoc->ctrl_queue_cnt--;
6982                         if (chk->data) {
6983                                 sctp_m_freem(chk->data);
6984                                 chk->data = NULL;
6985                         }
6986                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6987                 }
6988         }
6989 }
6990
6991
6992 static void
6993 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6994     struct sctp_association *asoc,
6995     struct sctp_tmit_chunk **data_list,
6996     int bundle_at,
6997     struct sctp_nets *net)
6998 {
6999         int i;
7000         struct sctp_tmit_chunk *tp1;
7001
7002         for (i = 0; i < bundle_at; i++) {
7003                 /* off of the send queue */
7004                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
7005                 asoc->send_queue_cnt--;
7006                 if (i > 0) {
7007                         /*
7008                          * Any chunk NOT 0 you zap the time chunk 0 gets
7009                          * zapped or set based on if a RTO measurment is
7010                          * needed.
7011                          */
7012                         data_list[i]->do_rtt = 0;
7013                 }
7014                 /* record time */
7015                 data_list[i]->sent_rcv_time = net->last_sent_time;
7016                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
7017                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
7018                 if (data_list[i]->whoTo == NULL) {
7019                         data_list[i]->whoTo = net;
7020                         atomic_add_int(&net->ref_count, 1);
7021                 }
7022                 /* on to the sent queue */
7023                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7024                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7025                         struct sctp_tmit_chunk *tpp;
7026
7027                         /* need to move back */
7028         back_up_more:
7029                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7030                         if (tpp == NULL) {
7031                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7032                                 goto all_done;
7033                         }
7034                         tp1 = tpp;
7035                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7036                                 goto back_up_more;
7037                         }
7038                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7039                 } else {
7040                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7041                             data_list[i],
7042                             sctp_next);
7043                 }
7044 all_done:
7045                 /* This does not lower until the cum-ack passes it */
7046                 asoc->sent_queue_cnt++;
7047                 if ((asoc->peers_rwnd <= 0) &&
7048                     (asoc->total_flight == 0) &&
7049                     (bundle_at == 1)) {
7050                         /* Mark the chunk as being a window probe */
7051                         SCTP_STAT_INCR(sctps_windowprobed);
7052                 }
7053 #ifdef SCTP_AUDITING_ENABLED
7054                 sctp_audit_log(0xC2, 3);
7055 #endif
7056                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7057                 data_list[i]->snd_count = 1;
7058                 data_list[i]->rec.data.chunk_was_revoked = 0;
7059                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7060                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7061                             data_list[i]->whoTo->flight_size,
7062                             data_list[i]->book_size,
7063                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7064                             data_list[i]->rec.data.tsn);
7065                 }
7066                 sctp_flight_size_increase(data_list[i]);
7067                 sctp_total_flight_increase(stcb, data_list[i]);
7068                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7069                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7070                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7071                 }
7072                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7073                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7074                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7075                         /* SWS sender side engages */
7076                         asoc->peers_rwnd = 0;
7077                 }
7078         }
7079         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7080                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7081         }
7082 }
7083
7084 static void
7085 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7086 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7087     SCTP_UNUSED
7088 #endif
7089 )
7090 {
7091         struct sctp_tmit_chunk *chk, *nchk;
7092
7093         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7094                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7095                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7096                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7097                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7098                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7099                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7100                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7101                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7102                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7103                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7104                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7105                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7106                         /* Stray chunks must be cleaned up */
7107         clean_up_anyway:
7108                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7109                         asoc->ctrl_queue_cnt--;
7110                         if (chk->data) {
7111                                 sctp_m_freem(chk->data);
7112                                 chk->data = NULL;
7113                         }
7114                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7115                                 asoc->fwd_tsn_cnt--;
7116                         }
7117                         sctp_free_a_chunk(stcb, chk, so_locked);
7118                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7119                         /* special handling, we must look into the param */
7120                         if (chk != asoc->str_reset) {
7121                                 goto clean_up_anyway;
7122                         }
7123                 }
7124         }
7125 }
7126
7127 static uint32_t
7128 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7129     uint32_t space_left, uint32_t frag_point, int eeor_on)
7130 {
7131         /*
7132          * Make a decision on if I should split a msg into multiple parts.
7133          * This is only asked of incomplete messages.
7134          */
7135         if (eeor_on) {
7136                 /*
7137                  * If we are doing EEOR we need to always send it if its the
7138                  * entire thing, since it might be all the guy is putting in
7139                  * the hopper.
7140                  */
7141                 if (space_left >= length) {
7142                         /*-
7143                          * If we have data outstanding,
7144                          * we get another chance when the sack
7145                          * arrives to transmit - wait for more data
7146                          */
7147                         if (stcb->asoc.total_flight == 0) {
7148                                 /*
7149                                  * If nothing is in flight, we zero the
7150                                  * packet counter.
7151                                  */
7152                                 return (length);
7153                         }
7154                         return (0);
7155
7156                 } else {
7157                         /* You can fill the rest */
7158                         return (space_left);
7159                 }
7160         }
7161         /*-
7162          * For those strange folk that make the send buffer
7163          * smaller than our fragmentation point, we can't
7164          * get a full msg in so we have to allow splitting.
7165          */
7166         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7167                 return (length);
7168         }
7169         if ((length <= space_left) ||
7170             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7171                 /* Sub-optimial residual don't split in non-eeor mode. */
7172                 return (0);
7173         }
7174         /*
7175          * If we reach here length is larger than the space_left. Do we wish
7176          * to split it for the sake of packet putting together?
7177          */
7178         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7179                 /* Its ok to split it */
7180                 return (min(space_left, frag_point));
7181         }
7182         /* Nope, can't split */
7183         return (0);
7184 }
7185
7186 static uint32_t
7187 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7188     struct sctp_stream_out *strq,
7189     uint32_t space_left,
7190     uint32_t frag_point,
7191     int *giveup,
7192     int eeor_mode,
7193     int *bail,
7194     int so_locked
7195 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7196     SCTP_UNUSED
7197 #endif
7198 )
7199 {
7200         /* Move from the stream to the send_queue keeping track of the total */
7201         struct sctp_association *asoc;
7202         struct sctp_stream_queue_pending *sp;
7203         struct sctp_tmit_chunk *chk;
7204         struct sctp_data_chunk *dchkh = NULL;
7205         struct sctp_idata_chunk *ndchkh = NULL;
7206         uint32_t to_move, length;
7207         int leading;
7208         uint8_t rcv_flags = 0;
7209         uint8_t some_taken;
7210         uint8_t send_lock_up = 0;
7211
7212         SCTP_TCB_LOCK_ASSERT(stcb);
7213         asoc = &stcb->asoc;
7214 one_more_time:
7215         /* sa_ignore FREED_MEMORY */
7216         sp = TAILQ_FIRST(&strq->outqueue);
7217         if (sp == NULL) {
7218                 if (send_lock_up == 0) {
7219                         SCTP_TCB_SEND_LOCK(stcb);
7220                         send_lock_up = 1;
7221                 }
7222                 sp = TAILQ_FIRST(&strq->outqueue);
7223                 if (sp) {
7224                         goto one_more_time;
7225                 }
7226                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7227                     (stcb->asoc.idata_supported == 0) &&
7228                     (strq->last_msg_incomplete)) {
7229                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7230                             strq->sid,
7231                             strq->last_msg_incomplete);
7232                         strq->last_msg_incomplete = 0;
7233                 }
7234                 to_move = 0;
7235                 if (send_lock_up) {
7236                         SCTP_TCB_SEND_UNLOCK(stcb);
7237                         send_lock_up = 0;
7238                 }
7239                 goto out_of;
7240         }
7241         if ((sp->msg_is_complete) && (sp->length == 0)) {
7242                 if (sp->sender_all_done) {
7243                         /*
7244                          * We are doing deferred cleanup. Last time through
7245                          * when we took all the data the sender_all_done was
7246                          * not set.
7247                          */
7248                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7249                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7250                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7251                                     sp->sender_all_done,
7252                                     sp->length,
7253                                     sp->msg_is_complete,
7254                                     sp->put_last_out,
7255                                     send_lock_up);
7256                         }
7257                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7258                                 SCTP_TCB_SEND_LOCK(stcb);
7259                                 send_lock_up = 1;
7260                         }
7261                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7262                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7263                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7264                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7265                             (strq->chunks_on_queues == 0) &&
7266                             TAILQ_EMPTY(&strq->outqueue)) {
7267                                 stcb->asoc.trigger_reset = 1;
7268                         }
7269                         if (sp->net) {
7270                                 sctp_free_remote_addr(sp->net);
7271                                 sp->net = NULL;
7272                         }
7273                         if (sp->data) {
7274                                 sctp_m_freem(sp->data);
7275                                 sp->data = NULL;
7276                         }
7277                         sctp_free_a_strmoq(stcb, sp, so_locked);
7278                         /* we can't be locked to it */
7279                         if (send_lock_up) {
7280                                 SCTP_TCB_SEND_UNLOCK(stcb);
7281                                 send_lock_up = 0;
7282                         }
7283                         /* back to get the next msg */
7284                         goto one_more_time;
7285                 } else {
7286                         /*
7287                          * sender just finished this but still holds a
7288                          * reference
7289                          */
7290                         *giveup = 1;
7291                         to_move = 0;
7292                         goto out_of;
7293                 }
7294         } else {
7295                 /* is there some to get */
7296                 if (sp->length == 0) {
7297                         /* no */
7298                         *giveup = 1;
7299                         to_move = 0;
7300                         goto out_of;
7301                 } else if (sp->discard_rest) {
7302                         if (send_lock_up == 0) {
7303                                 SCTP_TCB_SEND_LOCK(stcb);
7304                                 send_lock_up = 1;
7305                         }
7306                         /* Whack down the size */
7307                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7308                         if ((stcb->sctp_socket != NULL) &&
7309                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7310                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7311                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7312                         }
7313                         if (sp->data) {
7314                                 sctp_m_freem(sp->data);
7315                                 sp->data = NULL;
7316                                 sp->tail_mbuf = NULL;
7317                         }
7318                         sp->length = 0;
7319                         sp->some_taken = 1;
7320                         *giveup = 1;
7321                         to_move = 0;
7322                         goto out_of;
7323                 }
7324         }
7325         some_taken = sp->some_taken;
7326 re_look:
7327         length = sp->length;
7328         if (sp->msg_is_complete) {
7329                 /* The message is complete */
7330                 to_move = min(length, frag_point);
7331                 if (to_move == length) {
7332                         /* All of it fits in the MTU */
7333                         if (sp->some_taken) {
7334                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7335                         } else {
7336                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7337                         }
7338                         sp->put_last_out = 1;
7339                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7340                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7341                         }
7342                 } else {
7343                         /* Not all of it fits, we fragment */
7344                         if (sp->some_taken == 0) {
7345                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7346                         }
7347                         sp->some_taken = 1;
7348                 }
7349         } else {
7350                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7351                 if (to_move) {
7352                         /*-
7353                          * We use a snapshot of length in case it
7354                          * is expanding during the compare.
7355                          */
7356                         uint32_t llen;
7357
7358                         llen = length;
7359                         if (to_move >= llen) {
7360                                 to_move = llen;
7361                                 if (send_lock_up == 0) {
7362                                         /*-
7363                                          * We are taking all of an incomplete msg
7364                                          * thus we need a send lock.
7365                                          */
7366                                         SCTP_TCB_SEND_LOCK(stcb);
7367                                         send_lock_up = 1;
7368                                         if (sp->msg_is_complete) {
7369                                                 /*
7370                                                  * the sender finished the
7371                                                  * msg
7372                                                  */
7373                                                 goto re_look;
7374                                         }
7375                                 }
7376                         }
7377                         if (sp->some_taken == 0) {
7378                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7379                                 sp->some_taken = 1;
7380                         }
7381                 } else {
7382                         /* Nothing to take. */
7383                         *giveup = 1;
7384                         to_move = 0;
7385                         goto out_of;
7386                 }
7387         }
7388
7389         /* If we reach here, we can copy out a chunk */
7390         sctp_alloc_a_chunk(stcb, chk);
7391         if (chk == NULL) {
7392                 /* No chunk memory */
7393                 *giveup = 1;
7394                 to_move = 0;
7395                 goto out_of;
7396         }
7397         /*
7398          * Setup for unordered if needed by looking at the user sent info
7399          * flags.
7400          */
7401         if (sp->sinfo_flags & SCTP_UNORDERED) {
7402                 rcv_flags |= SCTP_DATA_UNORDERED;
7403         }
7404         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7405             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7406                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7407         }
7408         /* clear out the chunk before setting up */
7409         memset(chk, 0, sizeof(*chk));
7410         chk->rec.data.rcv_flags = rcv_flags;
7411
7412         if (to_move >= length) {
7413                 /* we think we can steal the whole thing */
7414                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7415                         SCTP_TCB_SEND_LOCK(stcb);
7416                         send_lock_up = 1;
7417                 }
7418                 if (to_move < sp->length) {
7419                         /* bail, it changed */
7420                         goto dont_do_it;
7421                 }
7422                 chk->data = sp->data;
7423                 chk->last_mbuf = sp->tail_mbuf;
7424                 /* register the stealing */
7425                 sp->data = sp->tail_mbuf = NULL;
7426         } else {
7427                 struct mbuf *m;
7428
7429 dont_do_it:
7430                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7431                 chk->last_mbuf = NULL;
7432                 if (chk->data == NULL) {
7433                         sp->some_taken = some_taken;
7434                         sctp_free_a_chunk(stcb, chk, so_locked);
7435                         *bail = 1;
7436                         to_move = 0;
7437                         goto out_of;
7438                 }
7439 #ifdef SCTP_MBUF_LOGGING
7440                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7441                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7442                 }
7443 #endif
7444                 /* Pull off the data */
7445                 m_adj(sp->data, to_move);
7446                 /* Now lets work our way down and compact it */
7447                 m = sp->data;
7448                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7449                         sp->data = SCTP_BUF_NEXT(m);
7450                         SCTP_BUF_NEXT(m) = NULL;
7451                         if (sp->tail_mbuf == m) {
7452                                 /*-
7453                                  * Freeing tail? TSNH since
7454                                  * we supposedly were taking less
7455                                  * than the sp->length.
7456                                  */
7457 #ifdef INVARIANTS
7458                                 panic("Huh, freing tail? - TSNH");
7459 #else
7460                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7461                                 sp->tail_mbuf = sp->data = NULL;
7462                                 sp->length = 0;
7463 #endif
7464
7465                         }
7466                         sctp_m_free(m);
7467                         m = sp->data;
7468                 }
7469         }
7470         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7471                 chk->copy_by_ref = 1;
7472         } else {
7473                 chk->copy_by_ref = 0;
7474         }
7475         /*
7476          * get last_mbuf and counts of mb usage This is ugly but hopefully
7477          * its only one mbuf.
7478          */
7479         if (chk->last_mbuf == NULL) {
7480                 chk->last_mbuf = chk->data;
7481                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7482                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7483                 }
7484         }
7485
7486         if (to_move > length) {
7487                 /*- This should not happen either
7488                  * since we always lower to_move to the size
7489                  * of sp->length if its larger.
7490                  */
7491 #ifdef INVARIANTS
7492                 panic("Huh, how can to_move be larger?");
7493 #else
7494                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7495                 sp->length = 0;
7496 #endif
7497         } else {
7498                 atomic_subtract_int(&sp->length, to_move);
7499         }
7500         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7501         if (M_LEADINGSPACE(chk->data) < leading) {
7502                 /* Not enough room for a chunk header, get some */
7503                 struct mbuf *m;
7504
7505                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7506                 if (m == NULL) {
7507                         /*
7508                          * we're in trouble here. _PREPEND below will free
7509                          * all the data if there is no leading space, so we
7510                          * must put the data back and restore.
7511                          */
7512                         if (send_lock_up == 0) {
7513                                 SCTP_TCB_SEND_LOCK(stcb);
7514                                 send_lock_up = 1;
7515                         }
7516                         if (sp->data == NULL) {
7517                                 /* unsteal the data */
7518                                 sp->data = chk->data;
7519                                 sp->tail_mbuf = chk->last_mbuf;
7520                         } else {
7521                                 struct mbuf *m_tmp;
7522
7523                                 /* reassemble the data */
7524                                 m_tmp = sp->data;
7525                                 sp->data = chk->data;
7526                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7527                         }
7528                         sp->some_taken = some_taken;
7529                         atomic_add_int(&sp->length, to_move);
7530                         chk->data = NULL;
7531                         *bail = 1;
7532                         sctp_free_a_chunk(stcb, chk, so_locked);
7533                         to_move = 0;
7534                         goto out_of;
7535                 } else {
7536                         SCTP_BUF_LEN(m) = 0;
7537                         SCTP_BUF_NEXT(m) = chk->data;
7538                         chk->data = m;
7539                         M_ALIGN(chk->data, 4);
7540                 }
7541         }
7542         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7543         if (chk->data == NULL) {
7544                 /* HELP, TSNH since we assured it would not above? */
7545 #ifdef INVARIANTS
7546                 panic("prepend failes HELP?");
7547 #else
7548                 SCTP_PRINTF("prepend fails HELP?\n");
7549                 sctp_free_a_chunk(stcb, chk, so_locked);
7550 #endif
7551                 *bail = 1;
7552                 to_move = 0;
7553                 goto out_of;
7554         }
7555         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7556         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7557         chk->book_size_scale = 0;
7558         chk->sent = SCTP_DATAGRAM_UNSENT;
7559
7560         chk->flags = 0;
7561         chk->asoc = &stcb->asoc;
7562         chk->pad_inplace = 0;
7563         chk->no_fr_allowed = 0;
7564         if (stcb->asoc.idata_supported == 0) {
7565                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7566                         /* Just use 0. The receiver ignores the values. */
7567                         chk->rec.data.mid = 0;
7568                 } else {
7569                         chk->rec.data.mid = strq->next_mid_ordered;
7570                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7571                                 strq->next_mid_ordered++;
7572                         }
7573                 }
7574         } else {
7575                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7576                         chk->rec.data.mid = strq->next_mid_unordered;
7577                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7578                                 strq->next_mid_unordered++;
7579                         }
7580                 } else {
7581                         chk->rec.data.mid = strq->next_mid_ordered;
7582                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7583                                 strq->next_mid_ordered++;
7584                         }
7585                 }
7586         }
7587         chk->rec.data.sid = sp->sid;
7588         chk->rec.data.ppid = sp->ppid;
7589         chk->rec.data.context = sp->context;
7590         chk->rec.data.doing_fast_retransmit = 0;
7591
7592         chk->rec.data.timetodrop = sp->ts;
7593         chk->flags = sp->act_flags;
7594
7595         if (sp->net) {
7596                 chk->whoTo = sp->net;
7597                 atomic_add_int(&chk->whoTo->ref_count, 1);
7598         } else
7599                 chk->whoTo = NULL;
7600
7601         if (sp->holds_key_ref) {
7602                 chk->auth_keyid = sp->auth_keyid;
7603                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7604                 chk->holds_key_ref = 1;
7605         }
7606         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7607         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7608                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7609                     (uint32_t)(uintptr_t)stcb, sp->length,
7610                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7611                     chk->rec.data.tsn);
7612         }
7613         if (stcb->asoc.idata_supported == 0) {
7614                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7615         } else {
7616                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7617         }
7618         /*
7619          * Put the rest of the things in place now. Size was done earlier in
7620          * previous loop prior to padding.
7621          */
7622
7623 #ifdef SCTP_ASOCLOG_OF_TSNS
7624         SCTP_TCB_LOCK_ASSERT(stcb);
7625         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7626                 asoc->tsn_out_at = 0;
7627                 asoc->tsn_out_wrapped = 1;
7628         }
7629         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7630         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7631         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7632         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7633         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7634         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7635         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7636         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7637         asoc->tsn_out_at++;
7638 #endif
7639         if (stcb->asoc.idata_supported == 0) {
7640                 dchkh->ch.chunk_type = SCTP_DATA;
7641                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7642                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7643                 dchkh->dp.sid = htons(strq->sid);
7644                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7645                 dchkh->dp.ppid = chk->rec.data.ppid;
7646                 dchkh->ch.chunk_length = htons(chk->send_size);
7647         } else {
7648                 ndchkh->ch.chunk_type = SCTP_IDATA;
7649                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7650                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7651                 ndchkh->dp.sid = htons(strq->sid);
7652                 ndchkh->dp.reserved = htons(0);
7653                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7654                 if (sp->fsn == 0)
7655                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7656                 else
7657                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7658                 sp->fsn++;
7659                 ndchkh->ch.chunk_length = htons(chk->send_size);
7660         }
7661         /* Now advance the chk->send_size by the actual pad needed. */
7662         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7663                 /* need a pad */
7664                 struct mbuf *lm;
7665                 int pads;
7666
7667                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7668                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7669                 if (lm != NULL) {
7670                         chk->last_mbuf = lm;
7671                         chk->pad_inplace = 1;
7672                 }
7673                 chk->send_size += pads;
7674         }
7675         if (PR_SCTP_ENABLED(chk->flags)) {
7676                 asoc->pr_sctp_cnt++;
7677         }
7678         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7679                 /* All done pull and kill the message */
7680                 if (sp->put_last_out == 0) {
7681                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7682                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7683                             sp->sender_all_done,
7684                             sp->length,
7685                             sp->msg_is_complete,
7686                             sp->put_last_out,
7687                             send_lock_up);
7688                 }
7689                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7690                         SCTP_TCB_SEND_LOCK(stcb);
7691                         send_lock_up = 1;
7692                 }
7693                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7694                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7695                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7696                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7697                     (strq->chunks_on_queues == 0) &&
7698                     TAILQ_EMPTY(&strq->outqueue)) {
7699                         stcb->asoc.trigger_reset = 1;
7700                 }
7701                 if (sp->net) {
7702                         sctp_free_remote_addr(sp->net);
7703                         sp->net = NULL;
7704                 }
7705                 if (sp->data) {
7706                         sctp_m_freem(sp->data);
7707                         sp->data = NULL;
7708                 }
7709                 sctp_free_a_strmoq(stcb, sp, so_locked);
7710         }
7711         asoc->chunks_on_out_queue++;
7712         strq->chunks_on_queues++;
7713         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7714         asoc->send_queue_cnt++;
7715 out_of:
7716         if (send_lock_up) {
7717                 SCTP_TCB_SEND_UNLOCK(stcb);
7718         }
7719         return (to_move);
7720 }
7721
7722
7723 static void
7724 sctp_fill_outqueue(struct sctp_tcb *stcb,
7725     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7726 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7727     SCTP_UNUSED
7728 #endif
7729 )
7730 {
7731         struct sctp_association *asoc;
7732         struct sctp_stream_out *strq;
7733         uint32_t space_left, moved, total_moved;
7734         int bail, giveup;
7735
7736         SCTP_TCB_LOCK_ASSERT(stcb);
7737         asoc = &stcb->asoc;
7738         total_moved = 0;
7739         switch (net->ro._l_addr.sa.sa_family) {
7740 #ifdef INET
7741         case AF_INET:
7742                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7743                 break;
7744 #endif
7745 #ifdef INET6
7746         case AF_INET6:
7747                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7748                 break;
7749 #endif
7750         default:
7751                 /* TSNH */
7752                 space_left = net->mtu;
7753                 break;
7754         }
7755         /* Need an allowance for the data chunk header too */
7756         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7757
7758         /* must make even word boundary */
7759         space_left &= 0xfffffffc;
7760         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7761         giveup = 0;
7762         bail = 0;
7763         while ((space_left > 0) && (strq != NULL)) {
7764                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7765                     &giveup, eeor_mode, &bail, so_locked);
7766                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7767                 if ((giveup != 0) || (bail != 0)) {
7768                         break;
7769                 }
7770                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7771                 total_moved += moved;
7772                 space_left -= moved;
7773                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7774                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7775                 } else {
7776                         space_left = 0;
7777                 }
7778                 space_left &= 0xfffffffc;
7779         }
7780         if (bail != 0)
7781                 *quit_now = 1;
7782
7783         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7784
7785         if (total_moved == 0) {
7786                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7787                     (net == stcb->asoc.primary_destination)) {
7788                         /* ran dry for primary network net */
7789                         SCTP_STAT_INCR(sctps_primary_randry);
7790                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7791                         /* ran dry with CMT on */
7792                         SCTP_STAT_INCR(sctps_cmt_randry);
7793                 }
7794         }
7795 }
7796
7797 void
7798 sctp_fix_ecn_echo(struct sctp_association *asoc)
7799 {
7800         struct sctp_tmit_chunk *chk;
7801
7802         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7803                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7804                         chk->sent = SCTP_DATAGRAM_UNSENT;
7805                 }
7806         }
7807 }
7808
7809 void
7810 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7811 {
7812         struct sctp_association *asoc;
7813         struct sctp_tmit_chunk *chk;
7814         struct sctp_stream_queue_pending *sp;
7815         unsigned int i;
7816
7817         if (net == NULL) {
7818                 return;
7819         }
7820         asoc = &stcb->asoc;
7821         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7822                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7823                         if (sp->net == net) {
7824                                 sctp_free_remote_addr(sp->net);
7825                                 sp->net = NULL;
7826                         }
7827                 }
7828         }
7829         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7830                 if (chk->whoTo == net) {
7831                         sctp_free_remote_addr(chk->whoTo);
7832                         chk->whoTo = NULL;
7833                 }
7834         }
7835 }
7836
7837 int
7838 sctp_med_chunk_output(struct sctp_inpcb *inp,
7839     struct sctp_tcb *stcb,
7840     struct sctp_association *asoc,
7841     int *num_out,
7842     int *reason_code,
7843     int control_only, int from_where,
7844     struct timeval *now, int *now_filled, int frag_point, int so_locked
7845 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7846     SCTP_UNUSED
7847 #endif
7848 )
7849 {
7850         /**
7851          * Ok this is the generic chunk service queue. we must do the
7852          * following:
7853          * - Service the stream queue that is next, moving any
7854          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7855          *   LAST to the out queue in one pass) and assigning TSN's. This
7856          *   only applys though if the peer does not support NDATA. For NDATA
7857          *   chunks its ok to not send the entire message ;-)
7858          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7859          *   fomulate and send the low level chunks. Making sure to combine
7860          *   any control in the control chunk queue also.
7861          */
7862         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7863         struct mbuf *outchain, *endoutchain;
7864         struct sctp_tmit_chunk *chk, *nchk;
7865
7866         /* temp arrays for unlinking */
7867         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7868         int no_fragmentflg, error;
7869         unsigned int max_rwnd_per_dest, max_send_per_dest;
7870         int one_chunk, hbflag, skip_data_for_this_net;
7871         int asconf, cookie, no_out_cnt;
7872         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7873         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7874         int tsns_sent = 0;
7875         uint32_t auth_offset = 0;
7876         struct sctp_auth_chunk *auth = NULL;
7877         uint16_t auth_keyid;
7878         int override_ok = 1;
7879         int skip_fill_up = 0;
7880         int data_auth_reqd = 0;
7881
7882         /*
7883          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7884          * destination.
7885          */
7886         int quit_now = 0;
7887
7888         *num_out = 0;
7889         *reason_code = 0;
7890         auth_keyid = stcb->asoc.authinfo.active_keyid;
7891         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7892             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7893             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7894                 eeor_mode = 1;
7895         } else {
7896                 eeor_mode = 0;
7897         }
7898         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7899         /*
7900          * First lets prime the pump. For each destination, if there is room
7901          * in the flight size, attempt to pull an MTU's worth out of the
7902          * stream queues into the general send_queue
7903          */
7904 #ifdef SCTP_AUDITING_ENABLED
7905         sctp_audit_log(0xC2, 2);
7906 #endif
7907         SCTP_TCB_LOCK_ASSERT(stcb);
7908         hbflag = 0;
7909         if (control_only)
7910                 no_data_chunks = 1;
7911         else
7912                 no_data_chunks = 0;
7913
7914         /* Nothing to possible to send? */
7915         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7916             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7917             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7918             TAILQ_EMPTY(&asoc->send_queue) &&
7919             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7920 nothing_to_send:
7921                 *reason_code = 9;
7922                 return (0);
7923         }
7924         if (asoc->peers_rwnd == 0) {
7925                 /* No room in peers rwnd */
7926                 *reason_code = 1;
7927                 if (asoc->total_flight > 0) {
7928                         /* we are allowed one chunk in flight */
7929                         no_data_chunks = 1;
7930                 }
7931         }
7932         if (stcb->asoc.ecn_echo_cnt_onq) {
7933                 /* Record where a sack goes, if any */
7934                 if (no_data_chunks &&
7935                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7936                         /* Nothing but ECNe to send - we don't do that */
7937                         goto nothing_to_send;
7938                 }
7939                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7940                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7941                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7942                                 sack_goes_to = chk->whoTo;
7943                                 break;
7944                         }
7945                 }
7946         }
7947         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7948         if (stcb->sctp_socket)
7949                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7950         else
7951                 max_send_per_dest = 0;
7952         if (no_data_chunks == 0) {
7953                 /* How many non-directed chunks are there? */
7954                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7955                         if (chk->whoTo == NULL) {
7956                                 /*
7957                                  * We already have non-directed chunks on
7958                                  * the queue, no need to do a fill-up.
7959                                  */
7960                                 skip_fill_up = 1;
7961                                 break;
7962                         }
7963                 }
7964
7965         }
7966         if ((no_data_chunks == 0) &&
7967             (skip_fill_up == 0) &&
7968             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7969                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7970                         /*
7971                          * This for loop we are in takes in each net, if
7972                          * its's got space in cwnd and has data sent to it
7973                          * (when CMT is off) then it calls
7974                          * sctp_fill_outqueue for the net. This gets data on
7975                          * the send queue for that network.
7976                          *
7977                          * In sctp_fill_outqueue TSN's are assigned and data
7978                          * is copied out of the stream buffers. Note mostly
7979                          * copy by reference (we hope).
7980                          */
7981                         net->window_probe = 0;
7982                         if ((net != stcb->asoc.alternate) &&
7983                             ((net->dest_state & SCTP_ADDR_PF) ||
7984                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7985                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7986                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7987                                         sctp_log_cwnd(stcb, net, 1,
7988                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7989                                 }
7990                                 continue;
7991                         }
7992                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7993                             (net->flight_size == 0)) {
7994                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7995                         }
7996                         if (net->flight_size >= net->cwnd) {
7997                                 /* skip this network, no room - can't fill */
7998                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7999                                         sctp_log_cwnd(stcb, net, 3,
8000                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8001                                 }
8002                                 continue;
8003                         }
8004                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8005                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8006                         }
8007                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
8008                         if (quit_now) {
8009                                 /* memory alloc failure */
8010                                 no_data_chunks = 1;
8011                                 break;
8012                         }
8013                 }
8014         }
8015         /* now service each destination and send out what we can for it */
8016         /* Nothing to send? */
8017         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8018             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8019             TAILQ_EMPTY(&asoc->send_queue)) {
8020                 *reason_code = 8;
8021                 return (0);
8022         }
8023
8024         if (asoc->sctp_cmt_on_off > 0) {
8025                 /* get the last start point */
8026                 start_at = asoc->last_net_cmt_send_started;
8027                 if (start_at == NULL) {
8028                         /* null so to beginning */
8029                         start_at = TAILQ_FIRST(&asoc->nets);
8030                 } else {
8031                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8032                         if (start_at == NULL) {
8033                                 start_at = TAILQ_FIRST(&asoc->nets);
8034                         }
8035                 }
8036                 asoc->last_net_cmt_send_started = start_at;
8037         } else {
8038                 start_at = TAILQ_FIRST(&asoc->nets);
8039         }
8040         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8041                 if (chk->whoTo == NULL) {
8042                         if (asoc->alternate) {
8043                                 chk->whoTo = asoc->alternate;
8044                         } else {
8045                                 chk->whoTo = asoc->primary_destination;
8046                         }
8047                         atomic_add_int(&chk->whoTo->ref_count, 1);
8048                 }
8049         }
8050         old_start_at = NULL;
8051 again_one_more_time:
8052         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8053                 /* how much can we send? */
8054                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8055                 if (old_start_at && (old_start_at == net)) {
8056                         /* through list ocmpletely. */
8057                         break;
8058                 }
8059                 tsns_sent = 0xa;
8060                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8061                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8062                     (net->flight_size >= net->cwnd)) {
8063                         /*
8064                          * Nothing on control or asconf and flight is full,
8065                          * we can skip even in the CMT case.
8066                          */
8067                         continue;
8068                 }
8069                 bundle_at = 0;
8070                 endoutchain = outchain = NULL;
8071                 no_fragmentflg = 1;
8072                 one_chunk = 0;
8073                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8074                         skip_data_for_this_net = 1;
8075                 } else {
8076                         skip_data_for_this_net = 0;
8077                 }
8078                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8079 #ifdef INET
8080                 case AF_INET:
8081                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8082                         break;
8083 #endif
8084 #ifdef INET6
8085                 case AF_INET6:
8086                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8087                         break;
8088 #endif
8089                 default:
8090                         /* TSNH */
8091                         mtu = net->mtu;
8092                         break;
8093                 }
8094                 mx_mtu = mtu;
8095                 to_out = 0;
8096                 if (mtu > asoc->peers_rwnd) {
8097                         if (asoc->total_flight > 0) {
8098                                 /* We have a packet in flight somewhere */
8099                                 r_mtu = asoc->peers_rwnd;
8100                         } else {
8101                                 /* We are always allowed to send one MTU out */
8102                                 one_chunk = 1;
8103                                 r_mtu = mtu;
8104                         }
8105                 } else {
8106                         r_mtu = mtu;
8107                 }
8108                 error = 0;
8109                 /************************/
8110                 /* ASCONF transmission */
8111                 /************************/
8112                 /* Now first lets go through the asconf queue */
8113                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8114                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8115                                 continue;
8116                         }
8117                         if (chk->whoTo == NULL) {
8118                                 if (asoc->alternate == NULL) {
8119                                         if (asoc->primary_destination != net) {
8120                                                 break;
8121                                         }
8122                                 } else {
8123                                         if (asoc->alternate != net) {
8124                                                 break;
8125                                         }
8126                                 }
8127                         } else {
8128                                 if (chk->whoTo != net) {
8129                                         break;
8130                                 }
8131                         }
8132                         if (chk->data == NULL) {
8133                                 break;
8134                         }
8135                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8136                             chk->sent != SCTP_DATAGRAM_RESEND) {
8137                                 break;
8138                         }
8139                         /*
8140                          * if no AUTH is yet included and this chunk
8141                          * requires it, make sure to account for it.  We
8142                          * don't apply the size until the AUTH chunk is
8143                          * actually added below in case there is no room for
8144                          * this chunk. NOTE: we overload the use of "omtu"
8145                          * here
8146                          */
8147                         if ((auth == NULL) &&
8148                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8149                             stcb->asoc.peer_auth_chunks)) {
8150                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8151                         } else
8152                                 omtu = 0;
8153                         /* Here we do NOT factor the r_mtu */
8154                         if ((chk->send_size < (int)(mtu - omtu)) ||
8155                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8156                                 /*
8157                                  * We probably should glom the mbuf chain
8158                                  * from the chk->data for control but the
8159                                  * problem is it becomes yet one more level
8160                                  * of tracking to do if for some reason
8161                                  * output fails. Then I have got to
8162                                  * reconstruct the merged control chain.. el
8163                                  * yucko.. for now we take the easy way and
8164                                  * do the copy
8165                                  */
8166                                 /*
8167                                  * Add an AUTH chunk, if chunk requires it
8168                                  * save the offset into the chain for AUTH
8169                                  */
8170                                 if ((auth == NULL) &&
8171                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8172                                     stcb->asoc.peer_auth_chunks))) {
8173                                         outchain = sctp_add_auth_chunk(outchain,
8174                                             &endoutchain,
8175                                             &auth,
8176                                             &auth_offset,
8177                                             stcb,
8178                                             chk->rec.chunk_id.id);
8179                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8180                                 }
8181                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8182                                     (int)chk->rec.chunk_id.can_take_data,
8183                                     chk->send_size, chk->copy_by_ref);
8184                                 if (outchain == NULL) {
8185                                         *reason_code = 8;
8186                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8187                                         return (ENOMEM);
8188                                 }
8189                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8190                                 /* update our MTU size */
8191                                 if (mtu > (chk->send_size + omtu))
8192                                         mtu -= (chk->send_size + omtu);
8193                                 else
8194                                         mtu = 0;
8195                                 to_out += (chk->send_size + omtu);
8196                                 /* Do clear IP_DF ? */
8197                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8198                                         no_fragmentflg = 0;
8199                                 }
8200                                 if (chk->rec.chunk_id.can_take_data)
8201                                         chk->data = NULL;
8202                                 /*
8203                                  * set hb flag since we can use these for
8204                                  * RTO
8205                                  */
8206                                 hbflag = 1;
8207                                 asconf = 1;
8208                                 /*
8209                                  * should sysctl this: don't bundle data
8210                                  * with ASCONF since it requires AUTH
8211                                  */
8212                                 no_data_chunks = 1;
8213                                 chk->sent = SCTP_DATAGRAM_SENT;
8214                                 if (chk->whoTo == NULL) {
8215                                         chk->whoTo = net;
8216                                         atomic_add_int(&net->ref_count, 1);
8217                                 }
8218                                 chk->snd_count++;
8219                                 if (mtu == 0) {
8220                                         /*
8221                                          * Ok we are out of room but we can
8222                                          * output without effecting the
8223                                          * flight size since this little guy
8224                                          * is a control only packet.
8225                                          */
8226                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8227                                         /*
8228                                          * do NOT clear the asconf flag as
8229                                          * it is used to do appropriate
8230                                          * source address selection.
8231                                          */
8232                                         if (*now_filled == 0) {
8233                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8234                                                 *now_filled = 1;
8235                                         }
8236                                         net->last_sent_time = *now;
8237                                         hbflag = 0;
8238                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8239                                             (struct sockaddr *)&net->ro._l_addr,
8240                                             outchain, auth_offset, auth,
8241                                             stcb->asoc.authinfo.active_keyid,
8242                                             no_fragmentflg, 0, asconf,
8243                                             inp->sctp_lport, stcb->rport,
8244                                             htonl(stcb->asoc.peer_vtag),
8245                                             net->port, NULL,
8246                                             0, 0,
8247                                             so_locked))) {
8248                                                 /*
8249                                                  * error, we could not
8250                                                  * output
8251                                                  */
8252                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8253                                                 if (from_where == 0) {
8254                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8255                                                 }
8256                                                 if (error == ENOBUFS) {
8257                                                         asoc->ifp_had_enobuf = 1;
8258                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8259                                                 }
8260                                                 /* error, could not output */
8261                                                 if (error == EHOSTUNREACH) {
8262                                                         /*
8263                                                          * Destination went
8264                                                          * unreachable
8265                                                          * during this send
8266                                                          */
8267                                                         sctp_move_chunks_from_net(stcb, net);
8268                                                 }
8269                                                 *reason_code = 7;
8270                                                 break;
8271                                         } else {
8272                                                 asoc->ifp_had_enobuf = 0;
8273                                         }
8274                                         /*
8275                                          * increase the number we sent, if a
8276                                          * cookie is sent we don't tell them
8277                                          * any was sent out.
8278                                          */
8279                                         outchain = endoutchain = NULL;
8280                                         auth = NULL;
8281                                         auth_offset = 0;
8282                                         if (!no_out_cnt)
8283                                                 *num_out += ctl_cnt;
8284                                         /* recalc a clean slate and setup */
8285                                         switch (net->ro._l_addr.sa.sa_family) {
8286 #ifdef INET
8287                                         case AF_INET:
8288                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8289                                                 break;
8290 #endif
8291 #ifdef INET6
8292                                         case AF_INET6:
8293                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8294                                                 break;
8295 #endif
8296                                         default:
8297                                                 /* TSNH */
8298                                                 mtu = net->mtu;
8299                                                 break;
8300                                         }
8301                                         to_out = 0;
8302                                         no_fragmentflg = 1;
8303                                 }
8304                         }
8305                 }
8306                 if (error != 0) {
8307                         /* try next net */
8308                         continue;
8309                 }
8310                 /************************/
8311                 /* Control transmission */
8312                 /************************/
8313                 /* Now first lets go through the control queue */
8314                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8315                         if ((sack_goes_to) &&
8316                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8317                             (chk->whoTo != sack_goes_to)) {
8318                                 /*
8319                                  * if we have a sack in queue, and we are
8320                                  * looking at an ecn echo that is NOT queued
8321                                  * to where the sack is going..
8322                                  */
8323                                 if (chk->whoTo == net) {
8324                                         /*
8325                                          * Don't transmit it to where its
8326                                          * going (current net)
8327                                          */
8328                                         continue;
8329                                 } else if (sack_goes_to == net) {
8330                                         /*
8331                                          * But do transmit it to this
8332                                          * address
8333                                          */
8334                                         goto skip_net_check;
8335                                 }
8336                         }
8337                         if (chk->whoTo == NULL) {
8338                                 if (asoc->alternate == NULL) {
8339                                         if (asoc->primary_destination != net) {
8340                                                 continue;
8341                                         }
8342                                 } else {
8343                                         if (asoc->alternate != net) {
8344                                                 continue;
8345                                         }
8346                                 }
8347                         } else {
8348                                 if (chk->whoTo != net) {
8349                                         continue;
8350                                 }
8351                         }
8352         skip_net_check:
8353                         if (chk->data == NULL) {
8354                                 continue;
8355                         }
8356                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8357                                 /*
8358                                  * It must be unsent. Cookies and ASCONF's
8359                                  * hang around but there timers will force
8360                                  * when marked for resend.
8361                                  */
8362                                 continue;
8363                         }
8364                         /*
8365                          * if no AUTH is yet included and this chunk
8366                          * requires it, make sure to account for it.  We
8367                          * don't apply the size until the AUTH chunk is
8368                          * actually added below in case there is no room for
8369                          * this chunk. NOTE: we overload the use of "omtu"
8370                          * here
8371                          */
8372                         if ((auth == NULL) &&
8373                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8374                             stcb->asoc.peer_auth_chunks)) {
8375                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8376                         } else
8377                                 omtu = 0;
8378                         /* Here we do NOT factor the r_mtu */
8379                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8380                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8381                                 /*
8382                                  * We probably should glom the mbuf chain
8383                                  * from the chk->data for control but the
8384                                  * problem is it becomes yet one more level
8385                                  * of tracking to do if for some reason
8386                                  * output fails. Then I have got to
8387                                  * reconstruct the merged control chain.. el
8388                                  * yucko.. for now we take the easy way and
8389                                  * do the copy
8390                                  */
8391                                 /*
8392                                  * Add an AUTH chunk, if chunk requires it
8393                                  * save the offset into the chain for AUTH
8394                                  */
8395                                 if ((auth == NULL) &&
8396                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8397                                     stcb->asoc.peer_auth_chunks))) {
8398                                         outchain = sctp_add_auth_chunk(outchain,
8399                                             &endoutchain,
8400                                             &auth,
8401                                             &auth_offset,
8402                                             stcb,
8403                                             chk->rec.chunk_id.id);
8404                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8405                                 }
8406                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8407                                     (int)chk->rec.chunk_id.can_take_data,
8408                                     chk->send_size, chk->copy_by_ref);
8409                                 if (outchain == NULL) {
8410                                         *reason_code = 8;
8411                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8412                                         return (ENOMEM);
8413                                 }
8414                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8415                                 /* update our MTU size */
8416                                 if (mtu > (chk->send_size + omtu))
8417                                         mtu -= (chk->send_size + omtu);
8418                                 else
8419                                         mtu = 0;
8420                                 to_out += (chk->send_size + omtu);
8421                                 /* Do clear IP_DF ? */
8422                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8423                                         no_fragmentflg = 0;
8424                                 }
8425                                 if (chk->rec.chunk_id.can_take_data)
8426                                         chk->data = NULL;
8427                                 /* Mark things to be removed, if needed */
8428                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8429                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8430                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8431                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8432                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8433                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8434                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8435                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8436                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8437                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8438                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8439                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8440                                                 hbflag = 1;
8441                                         }
8442                                         /* remove these chunks at the end */
8443                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8444                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8445                                                 /* turn off the timer */
8446                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8447                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8448                                                             inp, stcb, net,
8449                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8450                                                 }
8451                                         }
8452                                         ctl_cnt++;
8453                                 } else {
8454                                         /*
8455                                          * Other chunks, since they have
8456                                          * timers running (i.e. COOKIE) we
8457                                          * just "trust" that it gets sent or
8458                                          * retransmitted.
8459                                          */
8460                                         ctl_cnt++;
8461                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8462                                                 cookie = 1;
8463                                                 no_out_cnt = 1;
8464                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8465                                                 /*
8466                                                  * Increment ecne send count
8467                                                  * here this means we may be
8468                                                  * over-zealous in our
8469                                                  * counting if the send
8470                                                  * fails, but its the best
8471                                                  * place to do it (we used
8472                                                  * to do it in the queue of
8473                                                  * the chunk, but that did
8474                                                  * not tell how many times
8475                                                  * it was sent.
8476                                                  */
8477                                                 SCTP_STAT_INCR(sctps_sendecne);
8478                                         }
8479                                         chk->sent = SCTP_DATAGRAM_SENT;
8480                                         if (chk->whoTo == NULL) {
8481                                                 chk->whoTo = net;
8482                                                 atomic_add_int(&net->ref_count, 1);
8483                                         }
8484                                         chk->snd_count++;
8485                                 }
8486                                 if (mtu == 0) {
8487                                         /*
8488                                          * Ok we are out of room but we can
8489                                          * output without effecting the
8490                                          * flight size since this little guy
8491                                          * is a control only packet.
8492                                          */
8493                                         if (asconf) {
8494                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8495                                                 /*
8496                                                  * do NOT clear the asconf
8497                                                  * flag as it is used to do
8498                                                  * appropriate source
8499                                                  * address selection.
8500                                                  */
8501                                         }
8502                                         if (cookie) {
8503                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8504                                                 cookie = 0;
8505                                         }
8506                                         /* Only HB or ASCONF advances time */
8507                                         if (hbflag) {
8508                                                 if (*now_filled == 0) {
8509                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8510                                                         *now_filled = 1;
8511                                                 }
8512                                                 net->last_sent_time = *now;
8513                                                 hbflag = 0;
8514                                         }
8515                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8516                                             (struct sockaddr *)&net->ro._l_addr,
8517                                             outchain,
8518                                             auth_offset, auth,
8519                                             stcb->asoc.authinfo.active_keyid,
8520                                             no_fragmentflg, 0, asconf,
8521                                             inp->sctp_lport, stcb->rport,
8522                                             htonl(stcb->asoc.peer_vtag),
8523                                             net->port, NULL,
8524                                             0, 0,
8525                                             so_locked))) {
8526                                                 /*
8527                                                  * error, we could not
8528                                                  * output
8529                                                  */
8530                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8531                                                 if (from_where == 0) {
8532                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8533                                                 }
8534                                                 if (error == ENOBUFS) {
8535                                                         asoc->ifp_had_enobuf = 1;
8536                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8537                                                 }
8538                                                 if (error == EHOSTUNREACH) {
8539                                                         /*
8540                                                          * Destination went
8541                                                          * unreachable
8542                                                          * during this send
8543                                                          */
8544                                                         sctp_move_chunks_from_net(stcb, net);
8545                                                 }
8546                                                 *reason_code = 7;
8547                                                 break;
8548                                         } else {
8549                                                 asoc->ifp_had_enobuf = 0;
8550                                         }
8551                                         /*
8552                                          * increase the number we sent, if a
8553                                          * cookie is sent we don't tell them
8554                                          * any was sent out.
8555                                          */
8556                                         outchain = endoutchain = NULL;
8557                                         auth = NULL;
8558                                         auth_offset = 0;
8559                                         if (!no_out_cnt)
8560                                                 *num_out += ctl_cnt;
8561                                         /* recalc a clean slate and setup */
8562                                         switch (net->ro._l_addr.sa.sa_family) {
8563 #ifdef INET
8564                                         case AF_INET:
8565                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8566                                                 break;
8567 #endif
8568 #ifdef INET6
8569                                         case AF_INET6:
8570                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8571                                                 break;
8572 #endif
8573                                         default:
8574                                                 /* TSNH */
8575                                                 mtu = net->mtu;
8576                                                 break;
8577                                         }
8578                                         to_out = 0;
8579                                         no_fragmentflg = 1;
8580                                 }
8581                         }
8582                 }
8583                 if (error != 0) {
8584                         /* try next net */
8585                         continue;
8586                 }
8587                 /* JRI: if dest is in PF state, do not send data to it */
8588                 if ((asoc->sctp_cmt_on_off > 0) &&
8589                     (net != stcb->asoc.alternate) &&
8590                     (net->dest_state & SCTP_ADDR_PF)) {
8591                         goto no_data_fill;
8592                 }
8593                 if (net->flight_size >= net->cwnd) {
8594                         goto no_data_fill;
8595                 }
8596                 if ((asoc->sctp_cmt_on_off > 0) &&
8597                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8598                     (net->flight_size > max_rwnd_per_dest)) {
8599                         goto no_data_fill;
8600                 }
8601                 /*
8602                  * We need a specific accounting for the usage of the send
8603                  * buffer. We also need to check the number of messages per
8604                  * net. For now, this is better than nothing and it disabled
8605                  * by default...
8606                  */
8607                 if ((asoc->sctp_cmt_on_off > 0) &&
8608                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8609                     (max_send_per_dest > 0) &&
8610                     (net->flight_size > max_send_per_dest)) {
8611                         goto no_data_fill;
8612                 }
8613                 /*********************/
8614                 /* Data transmission */
8615                 /*********************/
8616                 /*
8617                  * if AUTH for DATA is required and no AUTH has been added
8618                  * yet, account for this in the mtu now... if no data can be
8619                  * bundled, this adjustment won't matter anyways since the
8620                  * packet will be going out...
8621                  */
8622                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8623                     stcb->asoc.peer_auth_chunks);
8624                 if (data_auth_reqd && (auth == NULL)) {
8625                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8626                 }
8627                 /* now lets add any data within the MTU constraints */
8628                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8629 #ifdef INET
8630                 case AF_INET:
8631                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8632                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8633                         else
8634                                 omtu = 0;
8635                         break;
8636 #endif
8637 #ifdef INET6
8638                 case AF_INET6:
8639                         if (net->mtu > SCTP_MIN_OVERHEAD)
8640                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8641                         else
8642                                 omtu = 0;
8643                         break;
8644 #endif
8645                 default:
8646                         /* TSNH */
8647                         omtu = 0;
8648                         break;
8649                 }
8650                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8651                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8652                     (skip_data_for_this_net == 0)) ||
8653                     (cookie)) {
8654                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8655                                 if (no_data_chunks) {
8656                                         /* let only control go out */
8657                                         *reason_code = 1;
8658                                         break;
8659                                 }
8660                                 if (net->flight_size >= net->cwnd) {
8661                                         /* skip this net, no room for data */
8662                                         *reason_code = 2;
8663                                         break;
8664                                 }
8665                                 if ((chk->whoTo != NULL) &&
8666                                     (chk->whoTo != net)) {
8667                                         /* Don't send the chunk on this net */
8668                                         continue;
8669                                 }
8670
8671                                 if (asoc->sctp_cmt_on_off == 0) {
8672                                         if ((asoc->alternate) &&
8673                                             (asoc->alternate != net) &&
8674                                             (chk->whoTo == NULL)) {
8675                                                 continue;
8676                                         } else if ((net != asoc->primary_destination) &&
8677                                                     (asoc->alternate == NULL) &&
8678                                             (chk->whoTo == NULL)) {
8679                                                 continue;
8680                                         }
8681                                 }
8682                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8683                                         /*-
8684                                          * strange, we have a chunk that is
8685                                          * to big for its destination and
8686                                          * yet no fragment ok flag.
8687                                          * Something went wrong when the
8688                                          * PMTU changed...we did not mark
8689                                          * this chunk for some reason?? I
8690                                          * will fix it here by letting IP
8691                                          * fragment it for now and printing
8692                                          * a warning. This really should not
8693                                          * happen ...
8694                                          */
8695                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8696                                             chk->send_size, mtu);
8697                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8698                                 }
8699                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8700                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8701                                         struct sctp_data_chunk *dchkh;
8702
8703                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8704                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8705                                 }
8706                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8707                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8708                                         /* ok we will add this one */
8709
8710                                         /*
8711                                          * Add an AUTH chunk, if chunk
8712                                          * requires it, save the offset into
8713                                          * the chain for AUTH
8714                                          */
8715                                         if (data_auth_reqd) {
8716                                                 if (auth == NULL) {
8717                                                         outchain = sctp_add_auth_chunk(outchain,
8718                                                             &endoutchain,
8719                                                             &auth,
8720                                                             &auth_offset,
8721                                                             stcb,
8722                                                             SCTP_DATA);
8723                                                         auth_keyid = chk->auth_keyid;
8724                                                         override_ok = 0;
8725                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8726                                                 } else if (override_ok) {
8727                                                         /*
8728                                                          * use this data's
8729                                                          * keyid
8730                                                          */
8731                                                         auth_keyid = chk->auth_keyid;
8732                                                         override_ok = 0;
8733                                                 } else if (auth_keyid != chk->auth_keyid) {
8734                                                         /*
8735                                                          * different keyid,
8736                                                          * so done bundling
8737                                                          */
8738                                                         break;
8739                                                 }
8740                                         }
8741                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8742                                             chk->send_size, chk->copy_by_ref);
8743                                         if (outchain == NULL) {
8744                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8745                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8746                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8747                                                 }
8748                                                 *reason_code = 3;
8749                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8750                                                 return (ENOMEM);
8751                                         }
8752                                         /* upate our MTU size */
8753                                         /* Do clear IP_DF ? */
8754                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8755                                                 no_fragmentflg = 0;
8756                                         }
8757                                         /* unsigned subtraction of mtu */
8758                                         if (mtu > chk->send_size)
8759                                                 mtu -= chk->send_size;
8760                                         else
8761                                                 mtu = 0;
8762                                         /* unsigned subtraction of r_mtu */
8763                                         if (r_mtu > chk->send_size)
8764                                                 r_mtu -= chk->send_size;
8765                                         else
8766                                                 r_mtu = 0;
8767
8768                                         to_out += chk->send_size;
8769                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8770 #ifdef INVARIANTS
8771                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8772 #else
8773                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8774                                                     mx_mtu, to_out);
8775 #endif
8776                                         }
8777                                         chk->window_probe = 0;
8778                                         data_list[bundle_at++] = chk;
8779                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8780                                                 break;
8781                                         }
8782                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8783                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8784                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8785                                                 } else {
8786                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8787                                                 }
8788                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8789                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8790                                                         /*
8791                                                          * Count number of
8792                                                          * user msg's that
8793                                                          * were fragmented
8794                                                          * we do this by
8795                                                          * counting when we
8796                                                          * see a LAST
8797                                                          * fragment only.
8798                                                          */
8799                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8800                                         }
8801                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8802                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8803                                                         data_list[0]->window_probe = 1;
8804                                                         net->window_probe = 1;
8805                                                 }
8806                                                 break;
8807                                         }
8808                                 } else {
8809                                         /*
8810                                          * Must be sent in order of the
8811                                          * TSN's (on a network)
8812                                          */
8813                                         break;
8814                                 }
8815                         }       /* for (chunk gather loop for this net) */
8816                 }               /* if asoc.state OPEN */
8817 no_data_fill:
8818                 /* Is there something to send for this destination? */
8819                 if (outchain) {
8820                         /* We may need to start a control timer or two */
8821                         if (asconf) {
8822                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8823                                     stcb, net);
8824                                 /*
8825                                  * do NOT clear the asconf flag as it is
8826                                  * used to do appropriate source address
8827                                  * selection.
8828                                  */
8829                         }
8830                         if (cookie) {
8831                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8832                                 cookie = 0;
8833                         }
8834                         /* must start a send timer if data is being sent */
8835                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8836                                 /*
8837                                  * no timer running on this destination
8838                                  * restart it.
8839                                  */
8840                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8841                         }
8842                         if (bundle_at || hbflag) {
8843                                 /* For data/asconf and hb set time */
8844                                 if (*now_filled == 0) {
8845                                         (void)SCTP_GETTIME_TIMEVAL(now);
8846                                         *now_filled = 1;
8847                                 }
8848                                 net->last_sent_time = *now;
8849                         }
8850                         /* Now send it, if there is anything to send :> */
8851                         if ((error = sctp_lowlevel_chunk_output(inp,
8852                             stcb,
8853                             net,
8854                             (struct sockaddr *)&net->ro._l_addr,
8855                             outchain,
8856                             auth_offset,
8857                             auth,
8858                             auth_keyid,
8859                             no_fragmentflg,
8860                             bundle_at,
8861                             asconf,
8862                             inp->sctp_lport, stcb->rport,
8863                             htonl(stcb->asoc.peer_vtag),
8864                             net->port, NULL,
8865                             0, 0,
8866                             so_locked))) {
8867                                 /* error, we could not output */
8868                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8869                                 if (from_where == 0) {
8870                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8871                                 }
8872                                 if (error == ENOBUFS) {
8873                                         asoc->ifp_had_enobuf = 1;
8874                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8875                                 }
8876                                 if (error == EHOSTUNREACH) {
8877                                         /*
8878                                          * Destination went unreachable
8879                                          * during this send
8880                                          */
8881                                         sctp_move_chunks_from_net(stcb, net);
8882                                 }
8883                                 *reason_code = 6;
8884                                 /*-
8885                                  * I add this line to be paranoid. As far as
8886                                  * I can tell the continue, takes us back to
8887                                  * the top of the for, but just to make sure
8888                                  * I will reset these again here.
8889                                  */
8890                                 ctl_cnt = bundle_at = 0;
8891                                 continue;       /* This takes us back to the
8892                                                  * for() for the nets. */
8893                         } else {
8894                                 asoc->ifp_had_enobuf = 0;
8895                         }
8896                         endoutchain = NULL;
8897                         auth = NULL;
8898                         auth_offset = 0;
8899                         if (!no_out_cnt) {
8900                                 *num_out += (ctl_cnt + bundle_at);
8901                         }
8902                         if (bundle_at) {
8903                                 /* setup for a RTO measurement */
8904                                 tsns_sent = data_list[0]->rec.data.tsn;
8905                                 /* fill time if not already filled */
8906                                 if (*now_filled == 0) {
8907                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8908                                         *now_filled = 1;
8909                                         *now = asoc->time_last_sent;
8910                                 } else {
8911                                         asoc->time_last_sent = *now;
8912                                 }
8913                                 if (net->rto_needed) {
8914                                         data_list[0]->do_rtt = 1;
8915                                         net->rto_needed = 0;
8916                                 }
8917                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8918                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8919                         }
8920                         if (one_chunk) {
8921                                 break;
8922                         }
8923                 }
8924                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8925                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8926                 }
8927         }
8928         if (old_start_at == NULL) {
8929                 old_start_at = start_at;
8930                 start_at = TAILQ_FIRST(&asoc->nets);
8931                 if (old_start_at)
8932                         goto again_one_more_time;
8933         }
8934
8935         /*
8936          * At the end there should be no NON timed chunks hanging on this
8937          * queue.
8938          */
8939         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8940                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8941         }
8942         if ((*num_out == 0) && (*reason_code == 0)) {
8943                 *reason_code = 4;
8944         } else {
8945                 *reason_code = 5;
8946         }
8947         sctp_clean_up_ctl(stcb, asoc, so_locked);
8948         return (0);
8949 }
8950
8951 void
8952 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8953 {
8954         /*-
8955          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8956          * the control chunk queue.
8957          */
8958         struct sctp_chunkhdr *hdr;
8959         struct sctp_tmit_chunk *chk;
8960         struct mbuf *mat, *last_mbuf;
8961         uint32_t chunk_length;
8962         uint16_t padding_length;
8963
8964         SCTP_TCB_LOCK_ASSERT(stcb);
8965         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8966         if (op_err == NULL) {
8967                 return;
8968         }
8969         last_mbuf = NULL;
8970         chunk_length = 0;
8971         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8972                 chunk_length += SCTP_BUF_LEN(mat);
8973                 if (SCTP_BUF_NEXT(mat) == NULL) {
8974                         last_mbuf = mat;
8975                 }
8976         }
8977         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8978                 sctp_m_freem(op_err);
8979                 return;
8980         }
8981         padding_length = chunk_length % 4;
8982         if (padding_length != 0) {
8983                 padding_length = 4 - padding_length;
8984         }
8985         if (padding_length != 0) {
8986                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8987                         sctp_m_freem(op_err);
8988                         return;
8989                 }
8990         }
8991         sctp_alloc_a_chunk(stcb, chk);
8992         if (chk == NULL) {
8993                 /* no memory */
8994                 sctp_m_freem(op_err);
8995                 return;
8996         }
8997         chk->copy_by_ref = 0;
8998         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8999         chk->rec.chunk_id.can_take_data = 0;
9000         chk->flags = 0;
9001         chk->send_size = (uint16_t)chunk_length;
9002         chk->sent = SCTP_DATAGRAM_UNSENT;
9003         chk->snd_count = 0;
9004         chk->asoc = &stcb->asoc;
9005         chk->data = op_err;
9006         chk->whoTo = NULL;
9007         hdr = mtod(op_err, struct sctp_chunkhdr *);
9008         hdr->chunk_type = SCTP_OPERATION_ERROR;
9009         hdr->chunk_flags = 0;
9010         hdr->chunk_length = htons(chk->send_size);
9011         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9012         chk->asoc->ctrl_queue_cnt++;
9013 }
9014
9015 int
9016 sctp_send_cookie_echo(struct mbuf *m,
9017     int offset, int limit,
9018     struct sctp_tcb *stcb,
9019     struct sctp_nets *net)
9020 {
9021         /*-
9022          * pull out the cookie and put it at the front of the control chunk
9023          * queue.
9024          */
9025         int at;
9026         struct mbuf *cookie;
9027         struct sctp_paramhdr param, *phdr;
9028         struct sctp_chunkhdr *hdr;
9029         struct sctp_tmit_chunk *chk;
9030         uint16_t ptype, plen;
9031
9032         SCTP_TCB_LOCK_ASSERT(stcb);
9033         /* First find the cookie in the param area */
9034         cookie = NULL;
9035         at = offset + sizeof(struct sctp_init_chunk);
9036         for (;;) {
9037                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9038                 if (phdr == NULL) {
9039                         return (-3);
9040                 }
9041                 ptype = ntohs(phdr->param_type);
9042                 plen = ntohs(phdr->param_length);
9043                 if (plen < sizeof(struct sctp_paramhdr)) {
9044                         return (-6);
9045                 }
9046                 if (ptype == SCTP_STATE_COOKIE) {
9047                         int pad;
9048
9049                         /* found the cookie */
9050                         if (at + plen > limit) {
9051                                 return (-7);
9052                         }
9053                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9054                         if (cookie == NULL) {
9055                                 /* No memory */
9056                                 return (-2);
9057                         }
9058                         if ((pad = (plen % 4)) > 0) {
9059                                 pad = 4 - pad;
9060                         }
9061                         if (pad > 0) {
9062                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
9063                                         return (-8);
9064                                 }
9065                         }
9066 #ifdef SCTP_MBUF_LOGGING
9067                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9068                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9069                         }
9070 #endif
9071                         break;
9072                 }
9073                 at += SCTP_SIZE32(plen);
9074         }
9075         /* ok, we got the cookie lets change it into a cookie echo chunk */
9076         /* first the change from param to cookie */
9077         hdr = mtod(cookie, struct sctp_chunkhdr *);
9078         hdr->chunk_type = SCTP_COOKIE_ECHO;
9079         hdr->chunk_flags = 0;
9080         /* get the chunk stuff now and place it in the FRONT of the queue */
9081         sctp_alloc_a_chunk(stcb, chk);
9082         if (chk == NULL) {
9083                 /* no memory */
9084                 sctp_m_freem(cookie);
9085                 return (-5);
9086         }
9087         chk->copy_by_ref = 0;
9088         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9089         chk->rec.chunk_id.can_take_data = 0;
9090         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9091         chk->send_size = SCTP_SIZE32(plen);
9092         chk->sent = SCTP_DATAGRAM_UNSENT;
9093         chk->snd_count = 0;
9094         chk->asoc = &stcb->asoc;
9095         chk->data = cookie;
9096         chk->whoTo = net;
9097         atomic_add_int(&chk->whoTo->ref_count, 1);
9098         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9099         chk->asoc->ctrl_queue_cnt++;
9100         return (0);
9101 }
9102
9103 void
9104 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9105     struct mbuf *m,
9106     int offset,
9107     int chk_length,
9108     struct sctp_nets *net)
9109 {
9110         /*
9111          * take a HB request and make it into a HB ack and send it.
9112          */
9113         struct mbuf *outchain;
9114         struct sctp_chunkhdr *chdr;
9115         struct sctp_tmit_chunk *chk;
9116
9117         if (net == NULL)
9118                 /* must have a net pointer */
9119                 return;
9120
9121         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9122         if (outchain == NULL) {
9123                 /* gak out of memory */
9124                 return;
9125         }
9126 #ifdef SCTP_MBUF_LOGGING
9127         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9128                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9129         }
9130 #endif
9131         chdr = mtod(outchain, struct sctp_chunkhdr *);
9132         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9133         chdr->chunk_flags = 0;
9134         if (chk_length % 4 != 0) {
9135                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9136         }
9137         sctp_alloc_a_chunk(stcb, chk);
9138         if (chk == NULL) {
9139                 /* no memory */
9140                 sctp_m_freem(outchain);
9141                 return;
9142         }
9143         chk->copy_by_ref = 0;
9144         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9145         chk->rec.chunk_id.can_take_data = 1;
9146         chk->flags = 0;
9147         chk->send_size = chk_length;
9148         chk->sent = SCTP_DATAGRAM_UNSENT;
9149         chk->snd_count = 0;
9150         chk->asoc = &stcb->asoc;
9151         chk->data = outchain;
9152         chk->whoTo = net;
9153         atomic_add_int(&chk->whoTo->ref_count, 1);
9154         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9155         chk->asoc->ctrl_queue_cnt++;
9156 }
9157
9158 void
9159 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9160 {
9161         /* formulate and queue a cookie-ack back to sender */
9162         struct mbuf *cookie_ack;
9163         struct sctp_chunkhdr *hdr;
9164         struct sctp_tmit_chunk *chk;
9165
9166         SCTP_TCB_LOCK_ASSERT(stcb);
9167
9168         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9169         if (cookie_ack == NULL) {
9170                 /* no mbuf's */
9171                 return;
9172         }
9173         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9174         sctp_alloc_a_chunk(stcb, chk);
9175         if (chk == NULL) {
9176                 /* no memory */
9177                 sctp_m_freem(cookie_ack);
9178                 return;
9179         }
9180         chk->copy_by_ref = 0;
9181         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9182         chk->rec.chunk_id.can_take_data = 1;
9183         chk->flags = 0;
9184         chk->send_size = sizeof(struct sctp_chunkhdr);
9185         chk->sent = SCTP_DATAGRAM_UNSENT;
9186         chk->snd_count = 0;
9187         chk->asoc = &stcb->asoc;
9188         chk->data = cookie_ack;
9189         if (chk->asoc->last_control_chunk_from != NULL) {
9190                 chk->whoTo = chk->asoc->last_control_chunk_from;
9191                 atomic_add_int(&chk->whoTo->ref_count, 1);
9192         } else {
9193                 chk->whoTo = NULL;
9194         }
9195         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9196         hdr->chunk_type = SCTP_COOKIE_ACK;
9197         hdr->chunk_flags = 0;
9198         hdr->chunk_length = htons(chk->send_size);
9199         SCTP_BUF_LEN(cookie_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
9206 void
9207 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9208 {
9209         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9210         struct mbuf *m_shutdown_ack;
9211         struct sctp_shutdown_ack_chunk *ack_cp;
9212         struct sctp_tmit_chunk *chk;
9213
9214         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9215         if (m_shutdown_ack == NULL) {
9216                 /* no mbuf's */
9217                 return;
9218         }
9219         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9220         sctp_alloc_a_chunk(stcb, chk);
9221         if (chk == NULL) {
9222                 /* no memory */
9223                 sctp_m_freem(m_shutdown_ack);
9224                 return;
9225         }
9226         chk->copy_by_ref = 0;
9227         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9228         chk->rec.chunk_id.can_take_data = 1;
9229         chk->flags = 0;
9230         chk->send_size = sizeof(struct sctp_chunkhdr);
9231         chk->sent = SCTP_DATAGRAM_UNSENT;
9232         chk->snd_count = 0;
9233         chk->asoc = &stcb->asoc;
9234         chk->data = m_shutdown_ack;
9235         chk->whoTo = net;
9236         if (chk->whoTo) {
9237                 atomic_add_int(&chk->whoTo->ref_count, 1);
9238         }
9239         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9240         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9241         ack_cp->ch.chunk_flags = 0;
9242         ack_cp->ch.chunk_length = htons(chk->send_size);
9243         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9244         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9245         chk->asoc->ctrl_queue_cnt++;
9246         return;
9247 }
9248
9249 void
9250 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9251 {
9252         /* formulate and queue a SHUTDOWN to the sender */
9253         struct mbuf *m_shutdown;
9254         struct sctp_shutdown_chunk *shutdown_cp;
9255         struct sctp_tmit_chunk *chk;
9256
9257         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9258                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9259                         /* We already have a SHUTDOWN queued. Reuse it. */
9260                         if (chk->whoTo) {
9261                                 sctp_free_remote_addr(chk->whoTo);
9262                                 chk->whoTo = NULL;
9263                         }
9264                         break;
9265                 }
9266         }
9267         if (chk == NULL) {
9268                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9269                 if (m_shutdown == NULL) {
9270                         /* no mbuf's */
9271                         return;
9272                 }
9273                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9274                 sctp_alloc_a_chunk(stcb, chk);
9275                 if (chk == NULL) {
9276                         /* no memory */
9277                         sctp_m_freem(m_shutdown);
9278                         return;
9279                 }
9280                 chk->copy_by_ref = 0;
9281                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9282                 chk->rec.chunk_id.can_take_data = 1;
9283                 chk->flags = 0;
9284                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9285                 chk->sent = SCTP_DATAGRAM_UNSENT;
9286                 chk->snd_count = 0;
9287                 chk->asoc = &stcb->asoc;
9288                 chk->data = m_shutdown;
9289                 chk->whoTo = net;
9290                 if (chk->whoTo) {
9291                         atomic_add_int(&chk->whoTo->ref_count, 1);
9292                 }
9293                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9294                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9295                 shutdown_cp->ch.chunk_flags = 0;
9296                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9297                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9298                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9299                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9300                 chk->asoc->ctrl_queue_cnt++;
9301         } else {
9302                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9303                 chk->whoTo = net;
9304                 if (chk->whoTo) {
9305                         atomic_add_int(&chk->whoTo->ref_count, 1);
9306                 }
9307                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9308                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9309                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9310         }
9311         return;
9312 }
9313
9314 void
9315 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9316 {
9317         /*
9318          * formulate and queue an ASCONF to the peer. ASCONF parameters
9319          * should be queued on the assoc queue.
9320          */
9321         struct sctp_tmit_chunk *chk;
9322         struct mbuf *m_asconf;
9323         int len;
9324
9325         SCTP_TCB_LOCK_ASSERT(stcb);
9326
9327         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9328             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9329                 /* can't send a new one if there is one in flight already */
9330                 return;
9331         }
9332
9333         /* compose an ASCONF chunk, maximum length is PMTU */
9334         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9335         if (m_asconf == NULL) {
9336                 return;
9337         }
9338
9339         sctp_alloc_a_chunk(stcb, chk);
9340         if (chk == NULL) {
9341                 /* no memory */
9342                 sctp_m_freem(m_asconf);
9343                 return;
9344         }
9345
9346         chk->copy_by_ref = 0;
9347         chk->rec.chunk_id.id = SCTP_ASCONF;
9348         chk->rec.chunk_id.can_take_data = 0;
9349         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9350         chk->data = m_asconf;
9351         chk->send_size = len;
9352         chk->sent = SCTP_DATAGRAM_UNSENT;
9353         chk->snd_count = 0;
9354         chk->asoc = &stcb->asoc;
9355         chk->whoTo = net;
9356         if (chk->whoTo) {
9357                 atomic_add_int(&chk->whoTo->ref_count, 1);
9358         }
9359         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9360         chk->asoc->ctrl_queue_cnt++;
9361         return;
9362 }
9363
9364 void
9365 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9366 {
9367         /*
9368          * formulate and queue a asconf-ack back to sender. the asconf-ack
9369          * must be stored in the tcb.
9370          */
9371         struct sctp_tmit_chunk *chk;
9372         struct sctp_asconf_ack *ack, *latest_ack;
9373         struct mbuf *m_ack;
9374         struct sctp_nets *net = NULL;
9375
9376         SCTP_TCB_LOCK_ASSERT(stcb);
9377         /* Get the latest ASCONF-ACK */
9378         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9379         if (latest_ack == NULL) {
9380                 return;
9381         }
9382         if (latest_ack->last_sent_to != NULL &&
9383             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9384                 /* we're doing a retransmission */
9385                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9386                 if (net == NULL) {
9387                         /* no alternate */
9388                         if (stcb->asoc.last_control_chunk_from == NULL) {
9389                                 if (stcb->asoc.alternate) {
9390                                         net = stcb->asoc.alternate;
9391                                 } else {
9392                                         net = stcb->asoc.primary_destination;
9393                                 }
9394                         } else {
9395                                 net = stcb->asoc.last_control_chunk_from;
9396                         }
9397                 }
9398         } else {
9399                 /* normal case */
9400                 if (stcb->asoc.last_control_chunk_from == NULL) {
9401                         if (stcb->asoc.alternate) {
9402                                 net = stcb->asoc.alternate;
9403                         } else {
9404                                 net = stcb->asoc.primary_destination;
9405                         }
9406                 } else {
9407                         net = stcb->asoc.last_control_chunk_from;
9408                 }
9409         }
9410         latest_ack->last_sent_to = net;
9411
9412         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9413                 if (ack->data == NULL) {
9414                         continue;
9415                 }
9416
9417                 /* copy the asconf_ack */
9418                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9419                 if (m_ack == NULL) {
9420                         /* couldn't copy it */
9421                         return;
9422                 }
9423 #ifdef SCTP_MBUF_LOGGING
9424                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9425                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9426                 }
9427 #endif
9428
9429                 sctp_alloc_a_chunk(stcb, chk);
9430                 if (chk == NULL) {
9431                         /* no memory */
9432                         if (m_ack)
9433                                 sctp_m_freem(m_ack);
9434                         return;
9435                 }
9436                 chk->copy_by_ref = 0;
9437                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9438                 chk->rec.chunk_id.can_take_data = 1;
9439                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9440                 chk->whoTo = net;
9441                 if (chk->whoTo) {
9442                         atomic_add_int(&chk->whoTo->ref_count, 1);
9443                 }
9444                 chk->data = m_ack;
9445                 chk->send_size = ack->len;
9446                 chk->sent = SCTP_DATAGRAM_UNSENT;
9447                 chk->snd_count = 0;
9448                 chk->asoc = &stcb->asoc;
9449
9450                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9451                 chk->asoc->ctrl_queue_cnt++;
9452         }
9453         return;
9454 }
9455
9456
9457 static int
9458 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9459     struct sctp_tcb *stcb,
9460     struct sctp_association *asoc,
9461     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9462 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9463     SCTP_UNUSED
9464 #endif
9465 )
9466 {
9467         /*-
9468          * send out one MTU of retransmission. If fast_retransmit is
9469          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9470          * rwnd. For a Cookie or Asconf in the control chunk queue we
9471          * retransmit them by themselves.
9472          *
9473          * For data chunks we will pick out the lowest TSN's in the sent_queue
9474          * marked for resend and bundle them all together (up to a MTU of
9475          * destination). The address to send to should have been
9476          * selected/changed where the retransmission was marked (i.e. in FR
9477          * or t3-timeout routines).
9478          */
9479         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9480         struct sctp_tmit_chunk *chk, *fwd;
9481         struct mbuf *m, *endofchain;
9482         struct sctp_nets *net = NULL;
9483         uint32_t tsns_sent = 0;
9484         int no_fragmentflg, bundle_at, cnt_thru;
9485         unsigned int mtu;
9486         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9487         struct sctp_auth_chunk *auth = NULL;
9488         uint32_t auth_offset = 0;
9489         uint16_t auth_keyid;
9490         int override_ok = 1;
9491         int data_auth_reqd = 0;
9492         uint32_t dmtu = 0;
9493
9494         SCTP_TCB_LOCK_ASSERT(stcb);
9495         tmr_started = ctl_cnt = bundle_at = error = 0;
9496         no_fragmentflg = 1;
9497         fwd_tsn = 0;
9498         *cnt_out = 0;
9499         fwd = NULL;
9500         endofchain = m = NULL;
9501         auth_keyid = stcb->asoc.authinfo.active_keyid;
9502 #ifdef SCTP_AUDITING_ENABLED
9503         sctp_audit_log(0xC3, 1);
9504 #endif
9505         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9506             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9507                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9508                     asoc->sent_queue_retran_cnt);
9509                 asoc->sent_queue_cnt = 0;
9510                 asoc->sent_queue_cnt_removeable = 0;
9511                 /* send back 0/0 so we enter normal transmission */
9512                 *cnt_out = 0;
9513                 return (0);
9514         }
9515         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9516                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9517                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9518                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9519                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9520                                 continue;
9521                         }
9522                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9523                                 if (chk != asoc->str_reset) {
9524                                         /*
9525                                          * not eligible for retran if its
9526                                          * not ours
9527                                          */
9528                                         continue;
9529                                 }
9530                         }
9531                         ctl_cnt++;
9532                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9533                                 fwd_tsn = 1;
9534                         }
9535                         /*
9536                          * Add an AUTH chunk, if chunk requires it save the
9537                          * offset into the chain for AUTH
9538                          */
9539                         if ((auth == NULL) &&
9540                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9541                             stcb->asoc.peer_auth_chunks))) {
9542                                 m = sctp_add_auth_chunk(m, &endofchain,
9543                                     &auth, &auth_offset,
9544                                     stcb,
9545                                     chk->rec.chunk_id.id);
9546                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9547                         }
9548                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9549                         break;
9550                 }
9551         }
9552         one_chunk = 0;
9553         cnt_thru = 0;
9554         /* do we have control chunks to retransmit? */
9555         if (m != NULL) {
9556                 /* Start a timer no matter if we succeed or fail */
9557                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9558                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9559                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9560                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9561                 chk->snd_count++;       /* update our count */
9562                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9563                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9564                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9565                     no_fragmentflg, 0, 0,
9566                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9567                     chk->whoTo->port, NULL,
9568                     0, 0,
9569                     so_locked))) {
9570                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9571                         if (error == ENOBUFS) {
9572                                 asoc->ifp_had_enobuf = 1;
9573                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9574                         }
9575                         return (error);
9576                 } else {
9577                         asoc->ifp_had_enobuf = 0;
9578                 }
9579                 endofchain = NULL;
9580                 auth = NULL;
9581                 auth_offset = 0;
9582                 /*
9583                  * We don't want to mark the net->sent time here since this
9584                  * we use this for HB and retrans cannot measure RTT
9585                  */
9586                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9587                 *cnt_out += 1;
9588                 chk->sent = SCTP_DATAGRAM_SENT;
9589                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9590                 if (fwd_tsn == 0) {
9591                         return (0);
9592                 } else {
9593                         /* Clean up the fwd-tsn list */
9594                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9595                         return (0);
9596                 }
9597         }
9598         /*
9599          * Ok, it is just data retransmission we need to do or that and a
9600          * fwd-tsn with it all.
9601          */
9602         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9603                 return (SCTP_RETRAN_DONE);
9604         }
9605         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9606             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9607                 /* not yet open, resend the cookie and that is it */
9608                 return (1);
9609         }
9610 #ifdef SCTP_AUDITING_ENABLED
9611         sctp_auditing(20, inp, stcb, NULL);
9612 #endif
9613         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9614         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9615                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9616                         /* No, not sent to this net or not ready for rtx */
9617                         continue;
9618                 }
9619                 if (chk->data == NULL) {
9620                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9621                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9622                         continue;
9623                 }
9624                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9625                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9626                         struct mbuf *op_err;
9627                         char msg[SCTP_DIAG_INFO_LEN];
9628
9629                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9630                             chk->rec.data.tsn, chk->snd_count);
9631                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9632                             msg);
9633                         atomic_add_int(&stcb->asoc.refcnt, 1);
9634                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9635                             so_locked);
9636                         SCTP_TCB_LOCK(stcb);
9637                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9638                         return (SCTP_RETRAN_EXIT);
9639                 }
9640                 /* pick up the net */
9641                 net = chk->whoTo;
9642                 switch (net->ro._l_addr.sa.sa_family) {
9643 #ifdef INET
9644                 case AF_INET:
9645                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9646                         break;
9647 #endif
9648 #ifdef INET6
9649                 case AF_INET6:
9650                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9651                         break;
9652 #endif
9653                 default:
9654                         /* TSNH */
9655                         mtu = net->mtu;
9656                         break;
9657                 }
9658
9659                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9660                         /* No room in peers rwnd */
9661                         uint32_t tsn;
9662
9663                         tsn = asoc->last_acked_seq + 1;
9664                         if (tsn == chk->rec.data.tsn) {
9665                                 /*
9666                                  * we make a special exception for this
9667                                  * case. The peer has no rwnd but is missing
9668                                  * the lowest chunk.. which is probably what
9669                                  * is holding up the rwnd.
9670                                  */
9671                                 goto one_chunk_around;
9672                         }
9673                         return (1);
9674                 }
9675 one_chunk_around:
9676                 if (asoc->peers_rwnd < mtu) {
9677                         one_chunk = 1;
9678                         if ((asoc->peers_rwnd == 0) &&
9679                             (asoc->total_flight == 0)) {
9680                                 chk->window_probe = 1;
9681                                 chk->whoTo->window_probe = 1;
9682                         }
9683                 }
9684 #ifdef SCTP_AUDITING_ENABLED
9685                 sctp_audit_log(0xC3, 2);
9686 #endif
9687                 bundle_at = 0;
9688                 m = NULL;
9689                 net->fast_retran_ip = 0;
9690                 if (chk->rec.data.doing_fast_retransmit == 0) {
9691                         /*
9692                          * if no FR in progress skip destination that have
9693                          * flight_size > cwnd.
9694                          */
9695                         if (net->flight_size >= net->cwnd) {
9696                                 continue;
9697                         }
9698                 } else {
9699                         /*
9700                          * Mark the destination net to have FR recovery
9701                          * limits put on it.
9702                          */
9703                         *fr_done = 1;
9704                         net->fast_retran_ip = 1;
9705                 }
9706
9707                 /*
9708                  * if no AUTH is yet included and this chunk requires it,
9709                  * make sure to account for it.  We don't apply the size
9710                  * until the AUTH chunk is actually added below in case
9711                  * there is no room for this chunk.
9712                  */
9713                 if (data_auth_reqd && (auth == NULL)) {
9714                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9715                 } else
9716                         dmtu = 0;
9717
9718                 if ((chk->send_size <= (mtu - dmtu)) ||
9719                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9720                         /* ok we will add this one */
9721                         if (data_auth_reqd) {
9722                                 if (auth == NULL) {
9723                                         m = sctp_add_auth_chunk(m,
9724                                             &endofchain,
9725                                             &auth,
9726                                             &auth_offset,
9727                                             stcb,
9728                                             SCTP_DATA);
9729                                         auth_keyid = chk->auth_keyid;
9730                                         override_ok = 0;
9731                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9732                                 } else if (override_ok) {
9733                                         auth_keyid = chk->auth_keyid;
9734                                         override_ok = 0;
9735                                 } else if (chk->auth_keyid != auth_keyid) {
9736                                         /* different keyid, so done bundling */
9737                                         break;
9738                                 }
9739                         }
9740                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9741                         if (m == NULL) {
9742                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9743                                 return (ENOMEM);
9744                         }
9745                         /* Do clear IP_DF ? */
9746                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9747                                 no_fragmentflg = 0;
9748                         }
9749                         /* upate our MTU size */
9750                         if (mtu > (chk->send_size + dmtu))
9751                                 mtu -= (chk->send_size + dmtu);
9752                         else
9753                                 mtu = 0;
9754                         data_list[bundle_at++] = chk;
9755                         if (one_chunk && (asoc->total_flight <= 0)) {
9756                                 SCTP_STAT_INCR(sctps_windowprobed);
9757                         }
9758                 }
9759                 if (one_chunk == 0) {
9760                         /*
9761                          * now are there anymore forward from chk to pick
9762                          * up?
9763                          */
9764                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9765                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9766                                         /* Nope, not for retran */
9767                                         continue;
9768                                 }
9769                                 if (fwd->whoTo != net) {
9770                                         /* Nope, not the net in question */
9771                                         continue;
9772                                 }
9773                                 if (data_auth_reqd && (auth == NULL)) {
9774                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9775                                 } else
9776                                         dmtu = 0;
9777                                 if (fwd->send_size <= (mtu - dmtu)) {
9778                                         if (data_auth_reqd) {
9779                                                 if (auth == NULL) {
9780                                                         m = sctp_add_auth_chunk(m,
9781                                                             &endofchain,
9782                                                             &auth,
9783                                                             &auth_offset,
9784                                                             stcb,
9785                                                             SCTP_DATA);
9786                                                         auth_keyid = fwd->auth_keyid;
9787                                                         override_ok = 0;
9788                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9789                                                 } else if (override_ok) {
9790                                                         auth_keyid = fwd->auth_keyid;
9791                                                         override_ok = 0;
9792                                                 } else if (fwd->auth_keyid != auth_keyid) {
9793                                                         /*
9794                                                          * different keyid,
9795                                                          * so done bundling
9796                                                          */
9797                                                         break;
9798                                                 }
9799                                         }
9800                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9801                                         if (m == NULL) {
9802                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9803                                                 return (ENOMEM);
9804                                         }
9805                                         /* Do clear IP_DF ? */
9806                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9807                                                 no_fragmentflg = 0;
9808                                         }
9809                                         /* upate our MTU size */
9810                                         if (mtu > (fwd->send_size + dmtu))
9811                                                 mtu -= (fwd->send_size + dmtu);
9812                                         else
9813                                                 mtu = 0;
9814                                         data_list[bundle_at++] = fwd;
9815                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9816                                                 break;
9817                                         }
9818                                 } else {
9819                                         /* can't fit so we are done */
9820                                         break;
9821                                 }
9822                         }
9823                 }
9824                 /* Is there something to send for this destination? */
9825                 if (m) {
9826                         /*
9827                          * No matter if we fail/or succeed we should start a
9828                          * timer. A failure is like a lost IP packet :-)
9829                          */
9830                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9831                                 /*
9832                                  * no timer running on this destination
9833                                  * restart it.
9834                                  */
9835                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9836                                 tmr_started = 1;
9837                         }
9838                         /* Now lets send it, if there is anything to send :> */
9839                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9840                             (struct sockaddr *)&net->ro._l_addr, m,
9841                             auth_offset, auth, auth_keyid,
9842                             no_fragmentflg, 0, 0,
9843                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9844                             net->port, NULL,
9845                             0, 0,
9846                             so_locked))) {
9847                                 /* error, we could not output */
9848                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9849                                 if (error == ENOBUFS) {
9850                                         asoc->ifp_had_enobuf = 1;
9851                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9852                                 }
9853                                 return (error);
9854                         } else {
9855                                 asoc->ifp_had_enobuf = 0;
9856                         }
9857                         endofchain = NULL;
9858                         auth = NULL;
9859                         auth_offset = 0;
9860                         /* For HB's */
9861                         /*
9862                          * We don't want to mark the net->sent time here
9863                          * since this we use this for HB and retrans cannot
9864                          * measure RTT
9865                          */
9866                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9867
9868                         /* For auto-close */
9869                         cnt_thru++;
9870                         if (*now_filled == 0) {
9871                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9872                                 *now = asoc->time_last_sent;
9873                                 *now_filled = 1;
9874                         } else {
9875                                 asoc->time_last_sent = *now;
9876                         }
9877                         *cnt_out += bundle_at;
9878 #ifdef SCTP_AUDITING_ENABLED
9879                         sctp_audit_log(0xC4, bundle_at);
9880 #endif
9881                         if (bundle_at) {
9882                                 tsns_sent = data_list[0]->rec.data.tsn;
9883                         }
9884                         for (i = 0; i < bundle_at; i++) {
9885                                 SCTP_STAT_INCR(sctps_sendretransdata);
9886                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9887                                 /*
9888                                  * When we have a revoked data, and we
9889                                  * retransmit it, then we clear the revoked
9890                                  * flag since this flag dictates if we
9891                                  * subtracted from the fs
9892                                  */
9893                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9894                                         /* Deflate the cwnd */
9895                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9896                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9897                                 }
9898                                 data_list[i]->snd_count++;
9899                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9900                                 /* record the time */
9901                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9902                                 if (data_list[i]->book_size_scale) {
9903                                         /*
9904                                          * need to double the book size on
9905                                          * this one
9906                                          */
9907                                         data_list[i]->book_size_scale = 0;
9908                                         /*
9909                                          * Since we double the booksize, we
9910                                          * must also double the output queue
9911                                          * size, since this get shrunk when
9912                                          * we free by this amount.
9913                                          */
9914                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9915                                         data_list[i]->book_size *= 2;
9916
9917
9918                                 } else {
9919                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9920                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9921                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9922                                         }
9923                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9924                                             (uint32_t)(data_list[i]->send_size +
9925                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9926                                 }
9927                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9928                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9929                                             data_list[i]->whoTo->flight_size,
9930                                             data_list[i]->book_size,
9931                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9932                                             data_list[i]->rec.data.tsn);
9933                                 }
9934                                 sctp_flight_size_increase(data_list[i]);
9935                                 sctp_total_flight_increase(stcb, data_list[i]);
9936                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9937                                         /* SWS sender side engages */
9938                                         asoc->peers_rwnd = 0;
9939                                 }
9940                                 if ((i == 0) &&
9941                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9942                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9943                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9944                                             (tmr_started == 0)) {
9945                                                 /*-
9946                                                  * ok we just fast-retrans'd
9947                                                  * the lowest TSN, i.e the
9948                                                  * first on the list. In
9949                                                  * this case we want to give
9950                                                  * some more time to get a
9951                                                  * SACK back without a
9952                                                  * t3-expiring.
9953                                                  */
9954                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9955                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9956                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9957                                         }
9958                                 }
9959                         }
9960                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9961                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9962                         }
9963 #ifdef SCTP_AUDITING_ENABLED
9964                         sctp_auditing(21, inp, stcb, NULL);
9965 #endif
9966                 } else {
9967                         /* None will fit */
9968                         return (1);
9969                 }
9970                 if (asoc->sent_queue_retran_cnt <= 0) {
9971                         /* all done we have no more to retran */
9972                         asoc->sent_queue_retran_cnt = 0;
9973                         break;
9974                 }
9975                 if (one_chunk) {
9976                         /* No more room in rwnd */
9977                         return (1);
9978                 }
9979                 /* stop the for loop here. we sent out a packet */
9980                 break;
9981         }
9982         return (0);
9983 }
9984
9985 static void
9986 sctp_timer_validation(struct sctp_inpcb *inp,
9987     struct sctp_tcb *stcb,
9988     struct sctp_association *asoc)
9989 {
9990         struct sctp_nets *net;
9991
9992         /* Validate that a timer is running somewhere */
9993         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9994                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9995                         /* Here is a timer */
9996                         return;
9997                 }
9998         }
9999         SCTP_TCB_LOCK_ASSERT(stcb);
10000         /* Gak, we did not have a timer somewhere */
10001         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
10002         if (asoc->alternate) {
10003                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
10004         } else {
10005                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
10006         }
10007         return;
10008 }
10009
10010 void
10011 sctp_chunk_output(struct sctp_inpcb *inp,
10012     struct sctp_tcb *stcb,
10013     int from_where,
10014     int so_locked
10015 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10016     SCTP_UNUSED
10017 #endif
10018 )
10019 {
10020         /*-
10021          * Ok this is the generic chunk service queue. we must do the
10022          * following:
10023          * - See if there are retransmits pending, if so we must
10024          *   do these first.
10025          * - Service the stream queue that is next, moving any
10026          *   message (note I must get a complete message i.e.
10027          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10028          *   TSN's
10029          * - Check to see if the cwnd/rwnd allows any output, if so we
10030          *   go ahead and fomulate and send the low level chunks. Making sure
10031          *   to combine any control in the control chunk queue also.
10032          */
10033         struct sctp_association *asoc;
10034         struct sctp_nets *net;
10035         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10036         unsigned int burst_cnt = 0;
10037         struct timeval now;
10038         int now_filled = 0;
10039         int nagle_on;
10040         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10041         int un_sent = 0;
10042         int fr_done;
10043         unsigned int tot_frs = 0;
10044
10045         asoc = &stcb->asoc;
10046 do_it_again:
10047         /* The Nagle algorithm is only applied when handling a send call. */
10048         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10049                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10050                         nagle_on = 0;
10051                 } else {
10052                         nagle_on = 1;
10053                 }
10054         } else {
10055                 nagle_on = 0;
10056         }
10057         SCTP_TCB_LOCK_ASSERT(stcb);
10058
10059         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10060
10061         if ((un_sent <= 0) &&
10062             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10063             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10064             (asoc->sent_queue_retran_cnt == 0) &&
10065             (asoc->trigger_reset == 0)) {
10066                 /* Nothing to do unless there is something to be sent left */
10067                 return;
10068         }
10069         /*
10070          * Do we have something to send, data or control AND a sack timer
10071          * running, if so piggy-back the sack.
10072          */
10073         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10074                 sctp_send_sack(stcb, so_locked);
10075                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10076         }
10077         while (asoc->sent_queue_retran_cnt) {
10078                 /*-
10079                  * Ok, it is retransmission time only, we send out only ONE
10080                  * packet with a single call off to the retran code.
10081                  */
10082                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10083                         /*-
10084                          * Special hook for handling cookiess discarded
10085                          * by peer that carried data. Send cookie-ack only
10086                          * and then the next call with get the retran's.
10087                          */
10088                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10089                             from_where,
10090                             &now, &now_filled, frag_point, so_locked);
10091                         return;
10092                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10093                         /* if its not from a HB then do it */
10094                         fr_done = 0;
10095                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10096                         if (fr_done) {
10097                                 tot_frs++;
10098                         }
10099                 } else {
10100                         /*
10101                          * its from any other place, we don't allow retran
10102                          * output (only control)
10103                          */
10104                         ret = 1;
10105                 }
10106                 if (ret > 0) {
10107                         /* Can't send anymore */
10108                         /*-
10109                          * now lets push out control by calling med-level
10110                          * output once. this assures that we WILL send HB's
10111                          * if queued too.
10112                          */
10113                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10114                             from_where,
10115                             &now, &now_filled, frag_point, so_locked);
10116 #ifdef SCTP_AUDITING_ENABLED
10117                         sctp_auditing(8, inp, stcb, NULL);
10118 #endif
10119                         sctp_timer_validation(inp, stcb, asoc);
10120                         return;
10121                 }
10122                 if (ret < 0) {
10123                         /*-
10124                          * The count was off.. retran is not happening so do
10125                          * the normal retransmission.
10126                          */
10127 #ifdef SCTP_AUDITING_ENABLED
10128                         sctp_auditing(9, inp, stcb, NULL);
10129 #endif
10130                         if (ret == SCTP_RETRAN_EXIT) {
10131                                 return;
10132                         }
10133                         break;
10134                 }
10135                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10136                         /* Only one transmission allowed out of a timeout */
10137 #ifdef SCTP_AUDITING_ENABLED
10138                         sctp_auditing(10, inp, stcb, NULL);
10139 #endif
10140                         /* Push out any control */
10141                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10142                             &now, &now_filled, frag_point, so_locked);
10143                         return;
10144                 }
10145                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10146                         /* Hit FR burst limit */
10147                         return;
10148                 }
10149                 if ((num_out == 0) && (ret == 0)) {
10150                         /* No more retrans to send */
10151                         break;
10152                 }
10153         }
10154 #ifdef SCTP_AUDITING_ENABLED
10155         sctp_auditing(12, inp, stcb, NULL);
10156 #endif
10157         /* Check for bad destinations, if they exist move chunks around. */
10158         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10159                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10160                         /*-
10161                          * if possible move things off of this address we
10162                          * still may send below due to the dormant state but
10163                          * we try to find an alternate address to send to
10164                          * and if we have one we move all queued data on the
10165                          * out wheel to this alternate address.
10166                          */
10167                         if (net->ref_count > 1)
10168                                 sctp_move_chunks_from_net(stcb, net);
10169                 } else {
10170                         /*-
10171                          * if ((asoc->sat_network) || (net->addr_is_local))
10172                          * { burst_limit = asoc->max_burst *
10173                          * SCTP_SAT_NETWORK_BURST_INCR; }
10174                          */
10175                         if (asoc->max_burst > 0) {
10176                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10177                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10178                                                 /*
10179                                                  * JRS - Use the congestion
10180                                                  * control given in the
10181                                                  * congestion control module
10182                                                  */
10183                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10184                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10185                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10186                                                 }
10187                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10188                                         }
10189                                         net->fast_retran_ip = 0;
10190                                 } else {
10191                                         if (net->flight_size == 0) {
10192                                                 /*
10193                                                  * Should be decaying the
10194                                                  * cwnd here
10195                                                  */
10196                                                 ;
10197                                         }
10198                                 }
10199                         }
10200                 }
10201
10202         }
10203         burst_cnt = 0;
10204         do {
10205                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10206                     &reason_code, 0, from_where,
10207                     &now, &now_filled, frag_point, so_locked);
10208                 if (error) {
10209                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10210                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10211                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10212                         }
10213                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10214                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10215                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10216                         }
10217                         break;
10218                 }
10219                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10220
10221                 tot_out += num_out;
10222                 burst_cnt++;
10223                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10224                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10225                         if (num_out == 0) {
10226                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10227                         }
10228                 }
10229                 if (nagle_on) {
10230                         /*
10231                          * When the Nagle algorithm is used, look at how
10232                          * much is unsent, then if its smaller than an MTU
10233                          * and we have data in flight we stop, except if we
10234                          * are handling a fragmented user message.
10235                          */
10236                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10237                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10238                             (stcb->asoc.total_flight > 0)) {
10239 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10240                                 break;
10241                         }
10242                 }
10243                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10244                     TAILQ_EMPTY(&asoc->send_queue) &&
10245                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10246                         /* Nothing left to send */
10247                         break;
10248                 }
10249                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10250                         /* Nothing left to send */
10251                         break;
10252                 }
10253         } while (num_out &&
10254             ((asoc->max_burst == 0) ||
10255             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10256             (burst_cnt < asoc->max_burst)));
10257
10258         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10259                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10260                         SCTP_STAT_INCR(sctps_maxburstqueued);
10261                         asoc->burst_limit_applied = 1;
10262                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10263                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10264                         }
10265                 } else {
10266                         asoc->burst_limit_applied = 0;
10267                 }
10268         }
10269         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10270                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10271         }
10272         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10273             tot_out);
10274
10275         /*-
10276          * Now we need to clean up the control chunk chain if a ECNE is on
10277          * it. It must be marked as UNSENT again so next call will continue
10278          * to send it until such time that we get a CWR, to remove it.
10279          */
10280         if (stcb->asoc.ecn_echo_cnt_onq)
10281                 sctp_fix_ecn_echo(asoc);
10282
10283         if (stcb->asoc.trigger_reset) {
10284                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10285                         goto do_it_again;
10286                 }
10287         }
10288         return;
10289 }
10290
10291
10292 int
10293 sctp_output(
10294     struct sctp_inpcb *inp,
10295     struct mbuf *m,
10296     struct sockaddr *addr,
10297     struct mbuf *control,
10298     struct thread *p,
10299     int flags)
10300 {
10301         if (inp == NULL) {
10302                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10303                 return (EINVAL);
10304         }
10305
10306         if (inp->sctp_socket == NULL) {
10307                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10308                 return (EINVAL);
10309         }
10310         return (sctp_sosend(inp->sctp_socket,
10311             addr,
10312             (struct uio *)NULL,
10313             m,
10314             control,
10315             flags, p
10316             ));
10317 }
10318
10319 void
10320 send_forward_tsn(struct sctp_tcb *stcb,
10321     struct sctp_association *asoc)
10322 {
10323         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10324         struct sctp_forward_tsn_chunk *fwdtsn;
10325         struct sctp_strseq *strseq;
10326         struct sctp_strseq_mid *strseq_m;
10327         uint32_t advance_peer_ack_point;
10328         unsigned int cnt_of_space, i, ovh;
10329         unsigned int space_needed;
10330         unsigned int cnt_of_skipped = 0;
10331
10332         SCTP_TCB_LOCK_ASSERT(stcb);
10333         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10334                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10335                         /* mark it to unsent */
10336                         chk->sent = SCTP_DATAGRAM_UNSENT;
10337                         chk->snd_count = 0;
10338                         /* Do we correct its output location? */
10339                         if (chk->whoTo) {
10340                                 sctp_free_remote_addr(chk->whoTo);
10341                                 chk->whoTo = NULL;
10342                         }
10343                         goto sctp_fill_in_rest;
10344                 }
10345         }
10346         /* Ok if we reach here we must build one */
10347         sctp_alloc_a_chunk(stcb, chk);
10348         if (chk == NULL) {
10349                 return;
10350         }
10351         asoc->fwd_tsn_cnt++;
10352         chk->copy_by_ref = 0;
10353         /*
10354          * We don't do the old thing here since this is used not for on-wire
10355          * but to tell if we are sending a fwd-tsn by the stack during
10356          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10357          */
10358         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10359         chk->rec.chunk_id.can_take_data = 0;
10360         chk->flags = 0;
10361         chk->asoc = asoc;
10362         chk->whoTo = NULL;
10363         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10364         if (chk->data == NULL) {
10365                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10366                 return;
10367         }
10368         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10369         chk->sent = SCTP_DATAGRAM_UNSENT;
10370         chk->snd_count = 0;
10371         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10372         asoc->ctrl_queue_cnt++;
10373 sctp_fill_in_rest:
10374         /*-
10375          * Here we go through and fill out the part that deals with
10376          * stream/seq of the ones we skip.
10377          */
10378         SCTP_BUF_LEN(chk->data) = 0;
10379         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10380                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10381                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10382                         /* no more to look at */
10383                         break;
10384                 }
10385                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10386                         /* We don't report these */
10387                         continue;
10388                 }
10389                 cnt_of_skipped++;
10390         }
10391         if (asoc->idata_supported) {
10392                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10393                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10394         } else {
10395                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10396                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10397         }
10398         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10399
10400         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10401                 ovh = SCTP_MIN_OVERHEAD;
10402         } else {
10403                 ovh = SCTP_MIN_V4_OVERHEAD;
10404         }
10405         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10406                 /* trim to a mtu size */
10407                 cnt_of_space = asoc->smallest_mtu - ovh;
10408         }
10409         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10410                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10411                     0xff, 0, cnt_of_skipped,
10412                     asoc->advanced_peer_ack_point);
10413         }
10414         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10415         if (cnt_of_space < space_needed) {
10416                 /*-
10417                  * ok we must trim down the chunk by lowering the
10418                  * advance peer ack point.
10419                  */
10420                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10421                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10422                             0xff, 0xff, cnt_of_space,
10423                             space_needed);
10424                 }
10425                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10426                 if (asoc->idata_supported) {
10427                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10428                 } else {
10429                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10430                 }
10431                 /*-
10432                  * Go through and find the TSN that will be the one
10433                  * we report.
10434                  */
10435                 at = TAILQ_FIRST(&asoc->sent_queue);
10436                 if (at != NULL) {
10437                         for (i = 0; i < cnt_of_skipped; i++) {
10438                                 tp1 = TAILQ_NEXT(at, sctp_next);
10439                                 if (tp1 == NULL) {
10440                                         break;
10441                                 }
10442                                 at = tp1;
10443                         }
10444                 }
10445                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10446                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10447                             0xff, cnt_of_skipped, at->rec.data.tsn,
10448                             asoc->advanced_peer_ack_point);
10449                 }
10450                 last = at;
10451                 /*-
10452                  * last now points to last one I can report, update
10453                  * peer ack point
10454                  */
10455                 if (last) {
10456                         advance_peer_ack_point = last->rec.data.tsn;
10457                 }
10458                 if (asoc->idata_supported) {
10459                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10460                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10461                 } else {
10462                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10463                             cnt_of_skipped * sizeof(struct sctp_strseq);
10464                 }
10465         }
10466         chk->send_size = space_needed;
10467         /* Setup the chunk */
10468         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10469         fwdtsn->ch.chunk_length = htons(chk->send_size);
10470         fwdtsn->ch.chunk_flags = 0;
10471         if (asoc->idata_supported) {
10472                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10473         } else {
10474                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10475         }
10476         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10477         SCTP_BUF_LEN(chk->data) = chk->send_size;
10478         fwdtsn++;
10479         /*-
10480          * Move pointer to after the fwdtsn and transfer to the
10481          * strseq pointer.
10482          */
10483         if (asoc->idata_supported) {
10484                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10485                 strseq = NULL;
10486         } else {
10487                 strseq = (struct sctp_strseq *)fwdtsn;
10488                 strseq_m = NULL;
10489         }
10490         /*-
10491          * Now populate the strseq list. This is done blindly
10492          * without pulling out duplicate stream info. This is
10493          * inefficent but won't harm the process since the peer will
10494          * look at these in sequence and will thus release anything.
10495          * It could mean we exceed the PMTU and chop off some that
10496          * we could have included.. but this is unlikely (aka 1432/4
10497          * would mean 300+ stream seq's would have to be reported in
10498          * one FWD-TSN. With a bit of work we can later FIX this to
10499          * optimize and pull out duplicates.. but it does add more
10500          * overhead. So for now... not!
10501          */
10502         i = 0;
10503         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10504                 if (i >= cnt_of_skipped) {
10505                         break;
10506                 }
10507                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10508                         /* We don't report these */
10509                         continue;
10510                 }
10511                 if (at->rec.data.tsn == advance_peer_ack_point) {
10512                         at->rec.data.fwd_tsn_cnt = 0;
10513                 }
10514                 if (asoc->idata_supported) {
10515                         strseq_m->sid = htons(at->rec.data.sid);
10516                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10517                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10518                         } else {
10519                                 strseq_m->flags = 0;
10520                         }
10521                         strseq_m->mid = htonl(at->rec.data.mid);
10522                         strseq_m++;
10523                 } else {
10524                         strseq->sid = htons(at->rec.data.sid);
10525                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10526                         strseq++;
10527                 }
10528                 i++;
10529         }
10530         return;
10531 }
10532
10533 void
10534 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10535 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10536     SCTP_UNUSED
10537 #endif
10538 )
10539 {
10540         /*-
10541          * Queue up a SACK or NR-SACK in the control queue.
10542          * We must first check to see if a SACK or NR-SACK is
10543          * somehow on the control queue.
10544          * If so, we will take and and remove the old one.
10545          */
10546         struct sctp_association *asoc;
10547         struct sctp_tmit_chunk *chk, *a_chk;
10548         struct sctp_sack_chunk *sack;
10549         struct sctp_nr_sack_chunk *nr_sack;
10550         struct sctp_gap_ack_block *gap_descriptor;
10551         const struct sack_track *selector;
10552         int mergeable = 0;
10553         int offset;
10554         caddr_t limit;
10555         uint32_t *dup;
10556         int limit_reached = 0;
10557         unsigned int i, siz, j;
10558         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10559         int num_dups = 0;
10560         int space_req;
10561         uint32_t highest_tsn;
10562         uint8_t flags;
10563         uint8_t type;
10564         uint8_t tsn_map;
10565
10566         if (stcb->asoc.nrsack_supported == 1) {
10567                 type = SCTP_NR_SELECTIVE_ACK;
10568         } else {
10569                 type = SCTP_SELECTIVE_ACK;
10570         }
10571         a_chk = NULL;
10572         asoc = &stcb->asoc;
10573         SCTP_TCB_LOCK_ASSERT(stcb);
10574         if (asoc->last_data_chunk_from == NULL) {
10575                 /* Hmm we never received anything */
10576                 return;
10577         }
10578         sctp_slide_mapping_arrays(stcb);
10579         sctp_set_rwnd(stcb, asoc);
10580         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10581                 if (chk->rec.chunk_id.id == type) {
10582                         /* Hmm, found a sack already on queue, remove it */
10583                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10584                         asoc->ctrl_queue_cnt--;
10585                         a_chk = chk;
10586                         if (a_chk->data) {
10587                                 sctp_m_freem(a_chk->data);
10588                                 a_chk->data = NULL;
10589                         }
10590                         if (a_chk->whoTo) {
10591                                 sctp_free_remote_addr(a_chk->whoTo);
10592                                 a_chk->whoTo = NULL;
10593                         }
10594                         break;
10595                 }
10596         }
10597         if (a_chk == NULL) {
10598                 sctp_alloc_a_chunk(stcb, a_chk);
10599                 if (a_chk == NULL) {
10600                         /* No memory so we drop the idea, and set a timer */
10601                         if (stcb->asoc.delayed_ack) {
10602                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10603                                     stcb->sctp_ep, stcb, NULL,
10604                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10605                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10606                                     stcb->sctp_ep, stcb, NULL);
10607                         } else {
10608                                 stcb->asoc.send_sack = 1;
10609                         }
10610                         return;
10611                 }
10612                 a_chk->copy_by_ref = 0;
10613                 a_chk->rec.chunk_id.id = type;
10614                 a_chk->rec.chunk_id.can_take_data = 1;
10615         }
10616         /* Clear our pkt counts */
10617         asoc->data_pkts_seen = 0;
10618
10619         a_chk->flags = 0;
10620         a_chk->asoc = asoc;
10621         a_chk->snd_count = 0;
10622         a_chk->send_size = 0;   /* fill in later */
10623         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10624         a_chk->whoTo = NULL;
10625
10626         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10627                 /*-
10628                  * Ok, the destination for the SACK is unreachable, lets see if
10629                  * we can select an alternate to asoc->last_data_chunk_from
10630                  */
10631                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10632                 if (a_chk->whoTo == NULL) {
10633                         /* Nope, no alternate */
10634                         a_chk->whoTo = asoc->last_data_chunk_from;
10635                 }
10636         } else {
10637                 a_chk->whoTo = asoc->last_data_chunk_from;
10638         }
10639         if (a_chk->whoTo) {
10640                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10641         }
10642         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10643                 highest_tsn = asoc->highest_tsn_inside_map;
10644         } else {
10645                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10646         }
10647         if (highest_tsn == asoc->cumulative_tsn) {
10648                 /* no gaps */
10649                 if (type == SCTP_SELECTIVE_ACK) {
10650                         space_req = sizeof(struct sctp_sack_chunk);
10651                 } else {
10652                         space_req = sizeof(struct sctp_nr_sack_chunk);
10653                 }
10654         } else {
10655                 /* gaps get a cluster */
10656                 space_req = MCLBYTES;
10657         }
10658         /* Ok now lets formulate a MBUF with our sack */
10659         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10660         if ((a_chk->data == NULL) ||
10661             (a_chk->whoTo == NULL)) {
10662                 /* rats, no mbuf memory */
10663                 if (a_chk->data) {
10664                         /* was a problem with the destination */
10665                         sctp_m_freem(a_chk->data);
10666                         a_chk->data = NULL;
10667                 }
10668                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10669                 /* sa_ignore NO_NULL_CHK */
10670                 if (stcb->asoc.delayed_ack) {
10671                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10672                             stcb->sctp_ep, stcb, NULL,
10673                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10674                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10675                             stcb->sctp_ep, stcb, NULL);
10676                 } else {
10677                         stcb->asoc.send_sack = 1;
10678                 }
10679                 return;
10680         }
10681         /* ok, lets go through and fill it in */
10682         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10683         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10684         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10685                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10686         }
10687         limit = mtod(a_chk->data, caddr_t);
10688         limit += space;
10689
10690         flags = 0;
10691
10692         if ((asoc->sctp_cmt_on_off > 0) &&
10693             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10694                 /*-
10695                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10696                  * received, then set high bit to 1, else 0. Reset
10697                  * pkts_rcvd.
10698                  */
10699                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10700                 asoc->cmt_dac_pkts_rcvd = 0;
10701         }
10702 #ifdef SCTP_ASOCLOG_OF_TSNS
10703         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10704         stcb->asoc.cumack_log_atsnt++;
10705         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10706                 stcb->asoc.cumack_log_atsnt = 0;
10707         }
10708 #endif
10709         /* reset the readers interpretation */
10710         stcb->freed_by_sorcv_sincelast = 0;
10711
10712         if (type == SCTP_SELECTIVE_ACK) {
10713                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10714                 nr_sack = NULL;
10715                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10716                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10717                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10718                 } else {
10719                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10720                 }
10721         } else {
10722                 sack = NULL;
10723                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10724                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10725                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10726                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10727                 } else {
10728                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10729                 }
10730         }
10731
10732         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10733                 offset = 1;
10734         } else {
10735                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10736         }
10737         if (((type == SCTP_SELECTIVE_ACK) &&
10738             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10739             ((type == SCTP_NR_SELECTIVE_ACK) &&
10740             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10741                 /* we have a gap .. maybe */
10742                 for (i = 0; i < siz; i++) {
10743                         tsn_map = asoc->mapping_array[i];
10744                         if (type == SCTP_SELECTIVE_ACK) {
10745                                 tsn_map |= asoc->nr_mapping_array[i];
10746                         }
10747                         if (i == 0) {
10748                                 /*
10749                                  * Clear all bits corresponding to TSNs
10750                                  * smaller or equal to the cumulative TSN.
10751                                  */
10752                                 tsn_map &= (~0U << (1 - offset));
10753                         }
10754                         selector = &sack_array[tsn_map];
10755                         if (mergeable && selector->right_edge) {
10756                                 /*
10757                                  * Backup, left and right edges were ok to
10758                                  * merge.
10759                                  */
10760                                 num_gap_blocks--;
10761                                 gap_descriptor--;
10762                         }
10763                         if (selector->num_entries == 0)
10764                                 mergeable = 0;
10765                         else {
10766                                 for (j = 0; j < selector->num_entries; j++) {
10767                                         if (mergeable && selector->right_edge) {
10768                                                 /*
10769                                                  * do a merge by NOT setting
10770                                                  * the left side
10771                                                  */
10772                                                 mergeable = 0;
10773                                         } else {
10774                                                 /*
10775                                                  * no merge, set the left
10776                                                  * side
10777                                                  */
10778                                                 mergeable = 0;
10779                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10780                                         }
10781                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10782                                         num_gap_blocks++;
10783                                         gap_descriptor++;
10784                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10785                                                 /* no more room */
10786                                                 limit_reached = 1;
10787                                                 break;
10788                                         }
10789                                 }
10790                                 if (selector->left_edge) {
10791                                         mergeable = 1;
10792                                 }
10793                         }
10794                         if (limit_reached) {
10795                                 /* Reached the limit stop */
10796                                 break;
10797                         }
10798                         offset += 8;
10799                 }
10800         }
10801         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10802             (limit_reached == 0)) {
10803
10804                 mergeable = 0;
10805
10806                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10807                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10808                 } else {
10809                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10810                 }
10811
10812                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10813                         offset = 1;
10814                 } else {
10815                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10816                 }
10817                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10818                         /* we have a gap .. maybe */
10819                         for (i = 0; i < siz; i++) {
10820                                 tsn_map = asoc->nr_mapping_array[i];
10821                                 if (i == 0) {
10822                                         /*
10823                                          * Clear all bits corresponding to
10824                                          * TSNs smaller or equal to the
10825                                          * cumulative TSN.
10826                                          */
10827                                         tsn_map &= (~0U << (1 - offset));
10828                                 }
10829                                 selector = &sack_array[tsn_map];
10830                                 if (mergeable && selector->right_edge) {
10831                                         /*
10832                                          * Backup, left and right edges were
10833                                          * ok to merge.
10834                                          */
10835                                         num_nr_gap_blocks--;
10836                                         gap_descriptor--;
10837                                 }
10838                                 if (selector->num_entries == 0)
10839                                         mergeable = 0;
10840                                 else {
10841                                         for (j = 0; j < selector->num_entries; j++) {
10842                                                 if (mergeable && selector->right_edge) {
10843                                                         /*
10844                                                          * do a merge by NOT
10845                                                          * setting the left
10846                                                          * side
10847                                                          */
10848                                                         mergeable = 0;
10849                                                 } else {
10850                                                         /*
10851                                                          * no merge, set the
10852                                                          * left side
10853                                                          */
10854                                                         mergeable = 0;
10855                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10856                                                 }
10857                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10858                                                 num_nr_gap_blocks++;
10859                                                 gap_descriptor++;
10860                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10861                                                         /* no more room */
10862                                                         limit_reached = 1;
10863                                                         break;
10864                                                 }
10865                                         }
10866                                         if (selector->left_edge) {
10867                                                 mergeable = 1;
10868                                         }
10869                                 }
10870                                 if (limit_reached) {
10871                                         /* Reached the limit stop */
10872                                         break;
10873                                 }
10874                                 offset += 8;
10875                         }
10876                 }
10877         }
10878         /* now we must add any dups we are going to report. */
10879         if ((limit_reached == 0) && (asoc->numduptsns)) {
10880                 dup = (uint32_t *)gap_descriptor;
10881                 for (i = 0; i < asoc->numduptsns; i++) {
10882                         *dup = htonl(asoc->dup_tsns[i]);
10883                         dup++;
10884                         num_dups++;
10885                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10886                                 /* no more room */
10887                                 break;
10888                         }
10889                 }
10890                 asoc->numduptsns = 0;
10891         }
10892         /*
10893          * now that the chunk is prepared queue it to the control chunk
10894          * queue.
10895          */
10896         if (type == SCTP_SELECTIVE_ACK) {
10897                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10898                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10899                     num_dups * sizeof(int32_t));
10900                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10901                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10902                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10903                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10904                 sack->sack.num_dup_tsns = htons(num_dups);
10905                 sack->ch.chunk_type = type;
10906                 sack->ch.chunk_flags = flags;
10907                 sack->ch.chunk_length = htons(a_chk->send_size);
10908         } else {
10909                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10910                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10911                     num_dups * sizeof(int32_t));
10912                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10913                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10914                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10915                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10916                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10917                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10918                 nr_sack->nr_sack.reserved = 0;
10919                 nr_sack->ch.chunk_type = type;
10920                 nr_sack->ch.chunk_flags = flags;
10921                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10922         }
10923         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10924         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10925         asoc->ctrl_queue_cnt++;
10926         asoc->send_sack = 0;
10927         SCTP_STAT_INCR(sctps_sendsacks);
10928         return;
10929 }
10930
10931 void
10932 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10933 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10934     SCTP_UNUSED
10935 #endif
10936 )
10937 {
10938         struct mbuf *m_abort, *m, *m_last;
10939         struct mbuf *m_out, *m_end = NULL;
10940         struct sctp_abort_chunk *abort;
10941         struct sctp_auth_chunk *auth = NULL;
10942         struct sctp_nets *net;
10943         uint32_t vtag;
10944         uint32_t auth_offset = 0;
10945         int error;
10946         uint16_t cause_len, chunk_len, padding_len;
10947
10948         SCTP_TCB_LOCK_ASSERT(stcb);
10949         /*-
10950          * Add an AUTH chunk, if chunk requires it and save the offset into
10951          * the chain for AUTH
10952          */
10953         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10954             stcb->asoc.peer_auth_chunks)) {
10955                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10956                     stcb, SCTP_ABORT_ASSOCIATION);
10957                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10958         } else {
10959                 m_out = NULL;
10960         }
10961         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10962         if (m_abort == NULL) {
10963                 if (m_out) {
10964                         sctp_m_freem(m_out);
10965                 }
10966                 if (operr) {
10967                         sctp_m_freem(operr);
10968                 }
10969                 return;
10970         }
10971         /* link in any error */
10972         SCTP_BUF_NEXT(m_abort) = operr;
10973         cause_len = 0;
10974         m_last = NULL;
10975         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10976                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10977                 if (SCTP_BUF_NEXT(m) == NULL) {
10978                         m_last = m;
10979                 }
10980         }
10981         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10982         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10983         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10984         if (m_out == NULL) {
10985                 /* NO Auth chunk prepended, so reserve space in front */
10986                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10987                 m_out = m_abort;
10988         } else {
10989                 /* Put AUTH chunk at the front of the chain */
10990                 SCTP_BUF_NEXT(m_end) = m_abort;
10991         }
10992         if (stcb->asoc.alternate) {
10993                 net = stcb->asoc.alternate;
10994         } else {
10995                 net = stcb->asoc.primary_destination;
10996         }
10997         /* Fill in the ABORT chunk header. */
10998         abort = mtod(m_abort, struct sctp_abort_chunk *);
10999         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11000         if (stcb->asoc.peer_vtag == 0) {
11001                 /* This happens iff the assoc is in COOKIE-WAIT state. */
11002                 vtag = stcb->asoc.my_vtag;
11003                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
11004         } else {
11005                 vtag = stcb->asoc.peer_vtag;
11006                 abort->ch.chunk_flags = 0;
11007         }
11008         abort->ch.chunk_length = htons(chunk_len);
11009         /* Add padding, if necessary. */
11010         if (padding_len > 0) {
11011                 if ((m_last == NULL) ||
11012                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
11013                         sctp_m_freem(m_out);
11014                         return;
11015                 }
11016         }
11017         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11018             (struct sockaddr *)&net->ro._l_addr,
11019             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
11020             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
11021             stcb->asoc.primary_destination->port, NULL,
11022             0, 0,
11023             so_locked))) {
11024                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11025                 if (error == ENOBUFS) {
11026                         stcb->asoc.ifp_had_enobuf = 1;
11027                         SCTP_STAT_INCR(sctps_lowlevelerr);
11028                 }
11029         } else {
11030                 stcb->asoc.ifp_had_enobuf = 0;
11031         }
11032         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11033 }
11034
11035 void
11036 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11037     struct sctp_nets *net,
11038     int reflect_vtag)
11039 {
11040         /* formulate and SEND a SHUTDOWN-COMPLETE */
11041         struct mbuf *m_shutdown_comp;
11042         struct sctp_shutdown_complete_chunk *shutdown_complete;
11043         uint32_t vtag;
11044         int error;
11045         uint8_t flags;
11046
11047         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11048         if (m_shutdown_comp == NULL) {
11049                 /* no mbuf's */
11050                 return;
11051         }
11052         if (reflect_vtag) {
11053                 flags = SCTP_HAD_NO_TCB;
11054                 vtag = stcb->asoc.my_vtag;
11055         } else {
11056                 flags = 0;
11057                 vtag = stcb->asoc.peer_vtag;
11058         }
11059         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11060         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11061         shutdown_complete->ch.chunk_flags = flags;
11062         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11063         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11064         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11065             (struct sockaddr *)&net->ro._l_addr,
11066             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11067             stcb->sctp_ep->sctp_lport, stcb->rport,
11068             htonl(vtag),
11069             net->port, NULL,
11070             0, 0,
11071             SCTP_SO_NOT_LOCKED))) {
11072                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11073                 if (error == ENOBUFS) {
11074                         stcb->asoc.ifp_had_enobuf = 1;
11075                         SCTP_STAT_INCR(sctps_lowlevelerr);
11076                 }
11077         } else {
11078                 stcb->asoc.ifp_had_enobuf = 0;
11079         }
11080         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11081         return;
11082 }
11083
11084 static void
11085 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11086     struct sctphdr *sh, uint32_t vtag,
11087     uint8_t type, struct mbuf *cause,
11088     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11089     uint32_t vrf_id, uint16_t port)
11090 {
11091         struct mbuf *o_pak;
11092         struct mbuf *mout;
11093         struct sctphdr *shout;
11094         struct sctp_chunkhdr *ch;
11095 #if defined(INET) || defined(INET6)
11096         struct udphdr *udp;
11097 #endif
11098         int ret, len, cause_len, padding_len;
11099 #ifdef INET
11100         struct sockaddr_in *src_sin, *dst_sin;
11101         struct ip *ip;
11102 #endif
11103 #ifdef INET6
11104         struct sockaddr_in6 *src_sin6, *dst_sin6;
11105         struct ip6_hdr *ip6;
11106 #endif
11107
11108         /* Compute the length of the cause and add final padding. */
11109         cause_len = 0;
11110         if (cause != NULL) {
11111                 struct mbuf *m_at, *m_last = NULL;
11112
11113                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11114                         if (SCTP_BUF_NEXT(m_at) == NULL)
11115                                 m_last = m_at;
11116                         cause_len += SCTP_BUF_LEN(m_at);
11117                 }
11118                 padding_len = cause_len % 4;
11119                 if (padding_len != 0) {
11120                         padding_len = 4 - padding_len;
11121                 }
11122                 if (padding_len != 0) {
11123                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11124                                 sctp_m_freem(cause);
11125                                 return;
11126                         }
11127                 }
11128         } else {
11129                 padding_len = 0;
11130         }
11131         /* Get an mbuf for the header. */
11132         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11133         switch (dst->sa_family) {
11134 #ifdef INET
11135         case AF_INET:
11136                 len += sizeof(struct ip);
11137                 break;
11138 #endif
11139 #ifdef INET6
11140         case AF_INET6:
11141                 len += sizeof(struct ip6_hdr);
11142                 break;
11143 #endif
11144         default:
11145                 break;
11146         }
11147 #if defined(INET) || defined(INET6)
11148         if (port) {
11149                 len += sizeof(struct udphdr);
11150         }
11151 #endif
11152         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11153         if (mout == NULL) {
11154                 if (cause) {
11155                         sctp_m_freem(cause);
11156                 }
11157                 return;
11158         }
11159         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11160         SCTP_BUF_LEN(mout) = len;
11161         SCTP_BUF_NEXT(mout) = cause;
11162         M_SETFIB(mout, fibnum);
11163         mout->m_pkthdr.flowid = mflowid;
11164         M_HASHTYPE_SET(mout, mflowtype);
11165 #ifdef INET
11166         ip = NULL;
11167 #endif
11168 #ifdef INET6
11169         ip6 = NULL;
11170 #endif
11171         switch (dst->sa_family) {
11172 #ifdef INET
11173         case AF_INET:
11174                 src_sin = (struct sockaddr_in *)src;
11175                 dst_sin = (struct sockaddr_in *)dst;
11176                 ip = mtod(mout, struct ip *);
11177                 ip->ip_v = IPVERSION;
11178                 ip->ip_hl = (sizeof(struct ip) >> 2);
11179                 ip->ip_tos = 0;
11180                 ip->ip_off = htons(IP_DF);
11181                 ip_fillid(ip);
11182                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11183                 if (port) {
11184                         ip->ip_p = IPPROTO_UDP;
11185                 } else {
11186                         ip->ip_p = IPPROTO_SCTP;
11187                 }
11188                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11189                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11190                 ip->ip_sum = 0;
11191                 len = sizeof(struct ip);
11192                 shout = (struct sctphdr *)((caddr_t)ip + len);
11193                 break;
11194 #endif
11195 #ifdef INET6
11196         case AF_INET6:
11197                 src_sin6 = (struct sockaddr_in6 *)src;
11198                 dst_sin6 = (struct sockaddr_in6 *)dst;
11199                 ip6 = mtod(mout, struct ip6_hdr *);
11200                 ip6->ip6_flow = htonl(0x60000000);
11201                 if (V_ip6_auto_flowlabel) {
11202                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11203                 }
11204                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11205                 if (port) {
11206                         ip6->ip6_nxt = IPPROTO_UDP;
11207                 } else {
11208                         ip6->ip6_nxt = IPPROTO_SCTP;
11209                 }
11210                 ip6->ip6_src = dst_sin6->sin6_addr;
11211                 ip6->ip6_dst = src_sin6->sin6_addr;
11212                 len = sizeof(struct ip6_hdr);
11213                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11214                 break;
11215 #endif
11216         default:
11217                 len = 0;
11218                 shout = mtod(mout, struct sctphdr *);
11219                 break;
11220         }
11221 #if defined(INET) || defined(INET6)
11222         if (port) {
11223                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11224                         sctp_m_freem(mout);
11225                         return;
11226                 }
11227                 udp = (struct udphdr *)shout;
11228                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11229                 udp->uh_dport = port;
11230                 udp->uh_sum = 0;
11231                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11232                     sizeof(struct sctphdr) +
11233                     sizeof(struct sctp_chunkhdr) +
11234                     cause_len + padding_len));
11235                 len += sizeof(struct udphdr);
11236                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11237         } else {
11238                 udp = NULL;
11239         }
11240 #endif
11241         shout->src_port = sh->dest_port;
11242         shout->dest_port = sh->src_port;
11243         shout->checksum = 0;
11244         if (vtag) {
11245                 shout->v_tag = htonl(vtag);
11246         } else {
11247                 shout->v_tag = sh->v_tag;
11248         }
11249         len += sizeof(struct sctphdr);
11250         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11251         ch->chunk_type = type;
11252         if (vtag) {
11253                 ch->chunk_flags = 0;
11254         } else {
11255                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11256         }
11257         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11258         len += sizeof(struct sctp_chunkhdr);
11259         len += cause_len + padding_len;
11260
11261         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11262                 sctp_m_freem(mout);
11263                 return;
11264         }
11265         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11266         switch (dst->sa_family) {
11267 #ifdef INET
11268         case AF_INET:
11269                 if (port) {
11270                         if (V_udp_cksum) {
11271                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11272                         } else {
11273                                 udp->uh_sum = 0;
11274                         }
11275                 }
11276                 ip->ip_len = htons(len);
11277                 if (port) {
11278                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11279                         SCTP_STAT_INCR(sctps_sendswcrc);
11280                         if (V_udp_cksum) {
11281                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11282                         }
11283                 } else {
11284                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11285                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11286                         SCTP_STAT_INCR(sctps_sendhwcrc);
11287                 }
11288 #ifdef SCTP_PACKET_LOGGING
11289                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11290                         sctp_packet_log(o_pak);
11291                 }
11292 #endif
11293                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11294                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11295                 break;
11296 #endif
11297 #ifdef INET6
11298         case AF_INET6:
11299                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11300                 if (port) {
11301                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11302                         SCTP_STAT_INCR(sctps_sendswcrc);
11303                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11304                                 udp->uh_sum = 0xffff;
11305                         }
11306                 } else {
11307                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11308                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11309                         SCTP_STAT_INCR(sctps_sendhwcrc);
11310                 }
11311 #ifdef SCTP_PACKET_LOGGING
11312                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11313                         sctp_packet_log(o_pak);
11314                 }
11315 #endif
11316                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11317                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11318                 break;
11319 #endif
11320         default:
11321                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11322                     dst->sa_family);
11323                 sctp_m_freem(mout);
11324                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11325                 return;
11326         }
11327         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11328         if (port) {
11329                 UDPSTAT_INC(udps_opackets);
11330         }
11331         SCTP_STAT_INCR(sctps_sendpackets);
11332         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11333         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11334         if (ret) {
11335                 SCTP_STAT_INCR(sctps_senderrors);
11336         }
11337         return;
11338 }
11339
11340 void
11341 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11342     struct sctphdr *sh,
11343     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11344     uint32_t vrf_id, uint16_t port)
11345 {
11346         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11347             mflowtype, mflowid, fibnum,
11348             vrf_id, port);
11349 }
11350
11351 void
11352 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11353 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11354     SCTP_UNUSED
11355 #endif
11356 )
11357 {
11358         struct sctp_tmit_chunk *chk;
11359         struct sctp_heartbeat_chunk *hb;
11360         struct timeval now;
11361
11362         SCTP_TCB_LOCK_ASSERT(stcb);
11363         if (net == NULL) {
11364                 return;
11365         }
11366         (void)SCTP_GETTIME_TIMEVAL(&now);
11367         switch (net->ro._l_addr.sa.sa_family) {
11368 #ifdef INET
11369         case AF_INET:
11370                 break;
11371 #endif
11372 #ifdef INET6
11373         case AF_INET6:
11374                 break;
11375 #endif
11376         default:
11377                 return;
11378         }
11379         sctp_alloc_a_chunk(stcb, chk);
11380         if (chk == NULL) {
11381                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11382                 return;
11383         }
11384
11385         chk->copy_by_ref = 0;
11386         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11387         chk->rec.chunk_id.can_take_data = 1;
11388         chk->flags = 0;
11389         chk->asoc = &stcb->asoc;
11390         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11391
11392         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11393         if (chk->data == NULL) {
11394                 sctp_free_a_chunk(stcb, chk, so_locked);
11395                 return;
11396         }
11397         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11398         SCTP_BUF_LEN(chk->data) = chk->send_size;
11399         chk->sent = SCTP_DATAGRAM_UNSENT;
11400         chk->snd_count = 0;
11401         chk->whoTo = net;
11402         atomic_add_int(&chk->whoTo->ref_count, 1);
11403         /* Now we have a mbuf that we can fill in with the details */
11404         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11405         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11406         /* fill out chunk header */
11407         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11408         hb->ch.chunk_flags = 0;
11409         hb->ch.chunk_length = htons(chk->send_size);
11410         /* Fill out hb parameter */
11411         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11412         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11413         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11414         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11415         /* Did our user request this one, put it in */
11416         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11417         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11418         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11419                 /*
11420                  * we only take from the entropy pool if the address is not
11421                  * confirmed.
11422                  */
11423                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11424                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11425         } else {
11426                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11427                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11428         }
11429         switch (net->ro._l_addr.sa.sa_family) {
11430 #ifdef INET
11431         case AF_INET:
11432                 memcpy(hb->heartbeat.hb_info.address,
11433                     &net->ro._l_addr.sin.sin_addr,
11434                     sizeof(net->ro._l_addr.sin.sin_addr));
11435                 break;
11436 #endif
11437 #ifdef INET6
11438         case AF_INET6:
11439                 memcpy(hb->heartbeat.hb_info.address,
11440                     &net->ro._l_addr.sin6.sin6_addr,
11441                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11442                 break;
11443 #endif
11444         default:
11445                 if (chk->data) {
11446                         sctp_m_freem(chk->data);
11447                         chk->data = NULL;
11448                 }
11449                 sctp_free_a_chunk(stcb, chk, so_locked);
11450                 return;
11451                 break;
11452         }
11453         net->hb_responded = 0;
11454         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11455         stcb->asoc.ctrl_queue_cnt++;
11456         SCTP_STAT_INCR(sctps_sendheartbeat);
11457         return;
11458 }
11459
11460 void
11461 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11462     uint32_t high_tsn)
11463 {
11464         struct sctp_association *asoc;
11465         struct sctp_ecne_chunk *ecne;
11466         struct sctp_tmit_chunk *chk;
11467
11468         if (net == NULL) {
11469                 return;
11470         }
11471         asoc = &stcb->asoc;
11472         SCTP_TCB_LOCK_ASSERT(stcb);
11473         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11474                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11475                         /* found a previous ECN_ECHO update it if needed */
11476                         uint32_t cnt, ctsn;
11477
11478                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11479                         ctsn = ntohl(ecne->tsn);
11480                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11481                                 ecne->tsn = htonl(high_tsn);
11482                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11483                         }
11484                         cnt = ntohl(ecne->num_pkts_since_cwr);
11485                         cnt++;
11486                         ecne->num_pkts_since_cwr = htonl(cnt);
11487                         return;
11488                 }
11489         }
11490         /* nope could not find one to update so we must build one */
11491         sctp_alloc_a_chunk(stcb, chk);
11492         if (chk == NULL) {
11493                 return;
11494         }
11495         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11496         chk->copy_by_ref = 0;
11497         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11498         chk->rec.chunk_id.can_take_data = 0;
11499         chk->flags = 0;
11500         chk->asoc = &stcb->asoc;
11501         chk->send_size = sizeof(struct sctp_ecne_chunk);
11502         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11503         if (chk->data == NULL) {
11504                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11505                 return;
11506         }
11507         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11508         SCTP_BUF_LEN(chk->data) = chk->send_size;
11509         chk->sent = SCTP_DATAGRAM_UNSENT;
11510         chk->snd_count = 0;
11511         chk->whoTo = net;
11512         atomic_add_int(&chk->whoTo->ref_count, 1);
11513
11514         stcb->asoc.ecn_echo_cnt_onq++;
11515         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11516         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11517         ecne->ch.chunk_flags = 0;
11518         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11519         ecne->tsn = htonl(high_tsn);
11520         ecne->num_pkts_since_cwr = htonl(1);
11521         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11522         asoc->ctrl_queue_cnt++;
11523 }
11524
11525 void
11526 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11527     struct mbuf *m, int len, int iphlen, int bad_crc)
11528 {
11529         struct sctp_association *asoc;
11530         struct sctp_pktdrop_chunk *drp;
11531         struct sctp_tmit_chunk *chk;
11532         uint8_t *datap;
11533         int was_trunc = 0;
11534         int fullsz = 0;
11535         long spc;
11536         int offset;
11537         struct sctp_chunkhdr *ch, chunk_buf;
11538         unsigned int chk_length;
11539
11540         if (!stcb) {
11541                 return;
11542         }
11543         asoc = &stcb->asoc;
11544         SCTP_TCB_LOCK_ASSERT(stcb);
11545         if (asoc->pktdrop_supported == 0) {
11546                 /*-
11547                  * peer must declare support before I send one.
11548                  */
11549                 return;
11550         }
11551         if (stcb->sctp_socket == NULL) {
11552                 return;
11553         }
11554         sctp_alloc_a_chunk(stcb, chk);
11555         if (chk == NULL) {
11556                 return;
11557         }
11558         chk->copy_by_ref = 0;
11559         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11560         chk->rec.chunk_id.can_take_data = 1;
11561         chk->flags = 0;
11562         len -= iphlen;
11563         chk->send_size = len;
11564         /* Validate that we do not have an ABORT in here. */
11565         offset = iphlen + sizeof(struct sctphdr);
11566         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11567             sizeof(*ch), (uint8_t *)&chunk_buf);
11568         while (ch != NULL) {
11569                 chk_length = ntohs(ch->chunk_length);
11570                 if (chk_length < sizeof(*ch)) {
11571                         /* break to abort land */
11572                         break;
11573                 }
11574                 switch (ch->chunk_type) {
11575                 case SCTP_PACKET_DROPPED:
11576                 case SCTP_ABORT_ASSOCIATION:
11577                 case SCTP_INITIATION_ACK:
11578                         /**
11579                          * We don't respond with an PKT-DROP to an ABORT
11580                          * or PKT-DROP. We also do not respond to an
11581                          * INIT-ACK, because we can't know if the initiation
11582                          * tag is correct or not.
11583                          */
11584                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11585                         return;
11586                 default:
11587                         break;
11588                 }
11589                 offset += SCTP_SIZE32(chk_length);
11590                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11591                     sizeof(*ch), (uint8_t *)&chunk_buf);
11592         }
11593
11594         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11595             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11596                 /*
11597                  * only send 1 mtu worth, trim off the excess on the end.
11598                  */
11599                 fullsz = len;
11600                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11601                 was_trunc = 1;
11602         }
11603         chk->asoc = &stcb->asoc;
11604         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11605         if (chk->data == NULL) {
11606 jump_out:
11607                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11608                 return;
11609         }
11610         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11611         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11612         if (drp == NULL) {
11613                 sctp_m_freem(chk->data);
11614                 chk->data = NULL;
11615                 goto jump_out;
11616         }
11617         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11618             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11619         chk->book_size_scale = 0;
11620         if (was_trunc) {
11621                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11622                 drp->trunc_len = htons(fullsz);
11623                 /*
11624                  * Len is already adjusted to size minus overhead above take
11625                  * out the pkt_drop chunk itself from it.
11626                  */
11627                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11628                 len = chk->send_size;
11629         } else {
11630                 /* no truncation needed */
11631                 drp->ch.chunk_flags = 0;
11632                 drp->trunc_len = htons(0);
11633         }
11634         if (bad_crc) {
11635                 drp->ch.chunk_flags |= SCTP_BADCRC;
11636         }
11637         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11638         SCTP_BUF_LEN(chk->data) = chk->send_size;
11639         chk->sent = SCTP_DATAGRAM_UNSENT;
11640         chk->snd_count = 0;
11641         if (net) {
11642                 /* we should hit here */
11643                 chk->whoTo = net;
11644                 atomic_add_int(&chk->whoTo->ref_count, 1);
11645         } else {
11646                 chk->whoTo = NULL;
11647         }
11648         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11649         drp->ch.chunk_length = htons(chk->send_size);
11650         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11651         if (spc < 0) {
11652                 spc = 0;
11653         }
11654         drp->bottle_bw = htonl(spc);
11655         if (asoc->my_rwnd) {
11656                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11657                     asoc->size_on_all_streams +
11658                     asoc->my_rwnd_control_len +
11659                     stcb->sctp_socket->so_rcv.sb_cc);
11660         } else {
11661                 /*-
11662                  * If my rwnd is 0, possibly from mbuf depletion as well as
11663                  * space used, tell the peer there is NO space aka onq == bw
11664                  */
11665                 drp->current_onq = htonl(spc);
11666         }
11667         drp->reserved = 0;
11668         datap = drp->data;
11669         m_copydata(m, iphlen, len, (caddr_t)datap);
11670         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11671         asoc->ctrl_queue_cnt++;
11672 }
11673
11674 void
11675 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11676 {
11677         struct sctp_association *asoc;
11678         struct sctp_cwr_chunk *cwr;
11679         struct sctp_tmit_chunk *chk;
11680
11681         SCTP_TCB_LOCK_ASSERT(stcb);
11682         if (net == NULL) {
11683                 return;
11684         }
11685         asoc = &stcb->asoc;
11686         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11687                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11688                         /*
11689                          * found a previous CWR queued to same destination
11690                          * update it if needed
11691                          */
11692                         uint32_t ctsn;
11693
11694                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11695                         ctsn = ntohl(cwr->tsn);
11696                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11697                                 cwr->tsn = htonl(high_tsn);
11698                         }
11699                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11700                                 /* Make sure override is carried */
11701                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11702                         }
11703                         return;
11704                 }
11705         }
11706         sctp_alloc_a_chunk(stcb, chk);
11707         if (chk == NULL) {
11708                 return;
11709         }
11710         chk->copy_by_ref = 0;
11711         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11712         chk->rec.chunk_id.can_take_data = 1;
11713         chk->flags = 0;
11714         chk->asoc = &stcb->asoc;
11715         chk->send_size = sizeof(struct sctp_cwr_chunk);
11716         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11717         if (chk->data == NULL) {
11718                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11719                 return;
11720         }
11721         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11722         SCTP_BUF_LEN(chk->data) = chk->send_size;
11723         chk->sent = SCTP_DATAGRAM_UNSENT;
11724         chk->snd_count = 0;
11725         chk->whoTo = net;
11726         atomic_add_int(&chk->whoTo->ref_count, 1);
11727         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11728         cwr->ch.chunk_type = SCTP_ECN_CWR;
11729         cwr->ch.chunk_flags = override;
11730         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11731         cwr->tsn = htonl(high_tsn);
11732         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11733         asoc->ctrl_queue_cnt++;
11734 }
11735
11736 static int
11737 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11738     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11739 {
11740         uint16_t len, old_len, i;
11741         struct sctp_stream_reset_out_request *req_out;
11742         struct sctp_chunkhdr *ch;
11743         int at;
11744         int number_entries = 0;
11745
11746         ch = mtod(chk->data, struct sctp_chunkhdr *);
11747         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11748         /* get to new offset for the param. */
11749         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11750         /* now how long will this param be? */
11751         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11752                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11753                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11754                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11755                         number_entries++;
11756                 }
11757         }
11758         if (number_entries == 0) {
11759                 return (0);
11760         }
11761         if (number_entries == stcb->asoc.streamoutcnt) {
11762                 number_entries = 0;
11763         }
11764         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11765                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11766         }
11767         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11768         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11769         req_out->ph.param_length = htons(len);
11770         req_out->request_seq = htonl(seq);
11771         req_out->response_seq = htonl(resp_seq);
11772         req_out->send_reset_at_tsn = htonl(last_sent);
11773         at = 0;
11774         if (number_entries) {
11775                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11776                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11777                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11778                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11779                                 req_out->list_of_streams[at] = htons(i);
11780                                 at++;
11781                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11782                                 if (at >= number_entries) {
11783                                         break;
11784                                 }
11785                         }
11786                 }
11787         } else {
11788                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11789                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11790                 }
11791         }
11792         if (SCTP_SIZE32(len) > len) {
11793                 /*-
11794                  * Need to worry about the pad we may end up adding to the
11795                  * end. This is easy since the struct is either aligned to 4
11796                  * bytes or 2 bytes off.
11797                  */
11798                 req_out->list_of_streams[number_entries] = 0;
11799         }
11800         /* now fix the chunk length */
11801         ch->chunk_length = htons(len + old_len);
11802         chk->book_size = len + old_len;
11803         chk->book_size_scale = 0;
11804         chk->send_size = SCTP_SIZE32(chk->book_size);
11805         SCTP_BUF_LEN(chk->data) = chk->send_size;
11806         return (1);
11807 }
11808
11809 static void
11810 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11811     int number_entries, uint16_t *list,
11812     uint32_t seq)
11813 {
11814         uint16_t len, old_len, i;
11815         struct sctp_stream_reset_in_request *req_in;
11816         struct sctp_chunkhdr *ch;
11817
11818         ch = mtod(chk->data, struct sctp_chunkhdr *);
11819         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11820
11821         /* get to new offset for the param. */
11822         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11823         /* now how long will this param be? */
11824         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11825         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11826         req_in->ph.param_length = htons(len);
11827         req_in->request_seq = htonl(seq);
11828         if (number_entries) {
11829                 for (i = 0; i < number_entries; i++) {
11830                         req_in->list_of_streams[i] = htons(list[i]);
11831                 }
11832         }
11833         if (SCTP_SIZE32(len) > len) {
11834                 /*-
11835                  * Need to worry about the pad we may end up adding to the
11836                  * end. This is easy since the struct is either aligned to 4
11837                  * bytes or 2 bytes off.
11838                  */
11839                 req_in->list_of_streams[number_entries] = 0;
11840         }
11841         /* now fix the chunk length */
11842         ch->chunk_length = htons(len + old_len);
11843         chk->book_size = len + old_len;
11844         chk->book_size_scale = 0;
11845         chk->send_size = SCTP_SIZE32(chk->book_size);
11846         SCTP_BUF_LEN(chk->data) = chk->send_size;
11847         return;
11848 }
11849
11850 static void
11851 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11852     uint32_t seq)
11853 {
11854         uint16_t len, old_len;
11855         struct sctp_stream_reset_tsn_request *req_tsn;
11856         struct sctp_chunkhdr *ch;
11857
11858         ch = mtod(chk->data, struct sctp_chunkhdr *);
11859         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11860
11861         /* get to new offset for the param. */
11862         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11863         /* now how long will this param be? */
11864         len = sizeof(struct sctp_stream_reset_tsn_request);
11865         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11866         req_tsn->ph.param_length = htons(len);
11867         req_tsn->request_seq = htonl(seq);
11868
11869         /* now fix the chunk length */
11870         ch->chunk_length = htons(len + old_len);
11871         chk->send_size = len + old_len;
11872         chk->book_size = SCTP_SIZE32(chk->send_size);
11873         chk->book_size_scale = 0;
11874         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11875         return;
11876 }
11877
11878 void
11879 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11880     uint32_t resp_seq, uint32_t result)
11881 {
11882         uint16_t len, old_len;
11883         struct sctp_stream_reset_response *resp;
11884         struct sctp_chunkhdr *ch;
11885
11886         ch = mtod(chk->data, struct sctp_chunkhdr *);
11887         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11888
11889         /* get to new offset for the param. */
11890         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11891         /* now how long will this param be? */
11892         len = sizeof(struct sctp_stream_reset_response);
11893         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11894         resp->ph.param_length = htons(len);
11895         resp->response_seq = htonl(resp_seq);
11896         resp->result = ntohl(result);
11897
11898         /* now fix the chunk length */
11899         ch->chunk_length = htons(len + old_len);
11900         chk->book_size = len + old_len;
11901         chk->book_size_scale = 0;
11902         chk->send_size = SCTP_SIZE32(chk->book_size);
11903         SCTP_BUF_LEN(chk->data) = chk->send_size;
11904         return;
11905 }
11906
11907 void
11908 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11909     struct sctp_stream_reset_list *ent,
11910     int response)
11911 {
11912         struct sctp_association *asoc;
11913         struct sctp_tmit_chunk *chk;
11914         struct sctp_chunkhdr *ch;
11915
11916         asoc = &stcb->asoc;
11917
11918         /*
11919          * Reset our last reset action to the new one IP -> response
11920          * (PERFORMED probably). This assures that if we fail to send, a
11921          * retran from the peer will get the new response.
11922          */
11923         asoc->last_reset_action[0] = response;
11924         if (asoc->stream_reset_outstanding) {
11925                 return;
11926         }
11927         sctp_alloc_a_chunk(stcb, chk);
11928         if (chk == NULL) {
11929                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11930                 return;
11931         }
11932         chk->copy_by_ref = 0;
11933         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11934         chk->rec.chunk_id.can_take_data = 0;
11935         chk->flags = 0;
11936         chk->asoc = &stcb->asoc;
11937         chk->book_size = sizeof(struct sctp_chunkhdr);
11938         chk->send_size = SCTP_SIZE32(chk->book_size);
11939         chk->book_size_scale = 0;
11940         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11941         if (chk->data == NULL) {
11942                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11943                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11944                 return;
11945         }
11946         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11947         /* setup chunk parameters */
11948         chk->sent = SCTP_DATAGRAM_UNSENT;
11949         chk->snd_count = 0;
11950         if (stcb->asoc.alternate) {
11951                 chk->whoTo = stcb->asoc.alternate;
11952         } else {
11953                 chk->whoTo = stcb->asoc.primary_destination;
11954         }
11955         ch = mtod(chk->data, struct sctp_chunkhdr *);
11956         ch->chunk_type = SCTP_STREAM_RESET;
11957         ch->chunk_flags = 0;
11958         ch->chunk_length = htons(chk->book_size);
11959         atomic_add_int(&chk->whoTo->ref_count, 1);
11960         SCTP_BUF_LEN(chk->data) = chk->send_size;
11961         sctp_add_stream_reset_result(chk, ent->seq, response);
11962         /* insert the chunk for sending */
11963         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11964             chk,
11965             sctp_next);
11966         asoc->ctrl_queue_cnt++;
11967 }
11968
11969 void
11970 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11971     uint32_t resp_seq, uint32_t result,
11972     uint32_t send_una, uint32_t recv_next)
11973 {
11974         uint16_t len, old_len;
11975         struct sctp_stream_reset_response_tsn *resp;
11976         struct sctp_chunkhdr *ch;
11977
11978         ch = mtod(chk->data, struct sctp_chunkhdr *);
11979         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11980
11981         /* get to new offset for the param. */
11982         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11983         /* now how long will this param be? */
11984         len = sizeof(struct sctp_stream_reset_response_tsn);
11985         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11986         resp->ph.param_length = htons(len);
11987         resp->response_seq = htonl(resp_seq);
11988         resp->result = htonl(result);
11989         resp->senders_next_tsn = htonl(send_una);
11990         resp->receivers_next_tsn = htonl(recv_next);
11991
11992         /* now fix the chunk length */
11993         ch->chunk_length = htons(len + old_len);
11994         chk->book_size = len + old_len;
11995         chk->send_size = SCTP_SIZE32(chk->book_size);
11996         chk->book_size_scale = 0;
11997         SCTP_BUF_LEN(chk->data) = chk->send_size;
11998         return;
11999 }
12000
12001 static void
12002 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
12003     uint32_t seq,
12004     uint16_t adding)
12005 {
12006         uint16_t len, old_len;
12007         struct sctp_chunkhdr *ch;
12008         struct sctp_stream_reset_add_strm *addstr;
12009
12010         ch = mtod(chk->data, struct sctp_chunkhdr *);
12011         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12012
12013         /* get to new offset for the param. */
12014         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12015         /* now how long will this param be? */
12016         len = sizeof(struct sctp_stream_reset_add_strm);
12017
12018         /* Fill it out. */
12019         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12020         addstr->ph.param_length = htons(len);
12021         addstr->request_seq = htonl(seq);
12022         addstr->number_of_streams = htons(adding);
12023         addstr->reserved = 0;
12024
12025         /* now fix the chunk length */
12026         ch->chunk_length = htons(len + old_len);
12027         chk->send_size = len + old_len;
12028         chk->book_size = SCTP_SIZE32(chk->send_size);
12029         chk->book_size_scale = 0;
12030         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12031         return;
12032 }
12033
12034 static void
12035 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12036     uint32_t seq,
12037     uint16_t adding)
12038 {
12039         uint16_t len, old_len;
12040         struct sctp_chunkhdr *ch;
12041         struct sctp_stream_reset_add_strm *addstr;
12042
12043         ch = mtod(chk->data, struct sctp_chunkhdr *);
12044         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12045
12046         /* get to new offset for the param. */
12047         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12048         /* now how long will this param be? */
12049         len = sizeof(struct sctp_stream_reset_add_strm);
12050         /* Fill it out. */
12051         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12052         addstr->ph.param_length = htons(len);
12053         addstr->request_seq = htonl(seq);
12054         addstr->number_of_streams = htons(adding);
12055         addstr->reserved = 0;
12056
12057         /* now fix the chunk length */
12058         ch->chunk_length = htons(len + old_len);
12059         chk->send_size = len + old_len;
12060         chk->book_size = SCTP_SIZE32(chk->send_size);
12061         chk->book_size_scale = 0;
12062         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12063         return;
12064 }
12065
12066 int
12067 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12068 {
12069         struct sctp_association *asoc;
12070         struct sctp_tmit_chunk *chk;
12071         struct sctp_chunkhdr *ch;
12072         uint32_t seq;
12073
12074         asoc = &stcb->asoc;
12075         asoc->trigger_reset = 0;
12076         if (asoc->stream_reset_outstanding) {
12077                 return (EALREADY);
12078         }
12079         sctp_alloc_a_chunk(stcb, chk);
12080         if (chk == NULL) {
12081                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12082                 return (ENOMEM);
12083         }
12084         chk->copy_by_ref = 0;
12085         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12086         chk->rec.chunk_id.can_take_data = 0;
12087         chk->flags = 0;
12088         chk->asoc = &stcb->asoc;
12089         chk->book_size = sizeof(struct sctp_chunkhdr);
12090         chk->send_size = SCTP_SIZE32(chk->book_size);
12091         chk->book_size_scale = 0;
12092         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12093         if (chk->data == NULL) {
12094                 sctp_free_a_chunk(stcb, chk, so_locked);
12095                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12096                 return (ENOMEM);
12097         }
12098         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12099
12100         /* setup chunk parameters */
12101         chk->sent = SCTP_DATAGRAM_UNSENT;
12102         chk->snd_count = 0;
12103         if (stcb->asoc.alternate) {
12104                 chk->whoTo = stcb->asoc.alternate;
12105         } else {
12106                 chk->whoTo = stcb->asoc.primary_destination;
12107         }
12108         ch = mtod(chk->data, struct sctp_chunkhdr *);
12109         ch->chunk_type = SCTP_STREAM_RESET;
12110         ch->chunk_flags = 0;
12111         ch->chunk_length = htons(chk->book_size);
12112         atomic_add_int(&chk->whoTo->ref_count, 1);
12113         SCTP_BUF_LEN(chk->data) = chk->send_size;
12114         seq = stcb->asoc.str_reset_seq_out;
12115         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12116                 seq++;
12117                 asoc->stream_reset_outstanding++;
12118         } else {
12119                 m_freem(chk->data);
12120                 chk->data = NULL;
12121                 sctp_free_a_chunk(stcb, chk, so_locked);
12122                 return (ENOENT);
12123         }
12124         asoc->str_reset = chk;
12125         /* insert the chunk for sending */
12126         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12127             chk,
12128             sctp_next);
12129         asoc->ctrl_queue_cnt++;
12130
12131         if (stcb->asoc.send_sack) {
12132                 sctp_send_sack(stcb, so_locked);
12133         }
12134         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12135         return (0);
12136 }
12137
12138 int
12139 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12140     uint16_t number_entries, uint16_t *list,
12141     uint8_t send_in_req,
12142     uint8_t send_tsn_req,
12143     uint8_t add_stream,
12144     uint16_t adding_o,
12145     uint16_t adding_i, uint8_t peer_asked)
12146 {
12147         struct sctp_association *asoc;
12148         struct sctp_tmit_chunk *chk;
12149         struct sctp_chunkhdr *ch;
12150         int can_send_out_req = 0;
12151         uint32_t seq;
12152
12153         asoc = &stcb->asoc;
12154         if (asoc->stream_reset_outstanding) {
12155                 /*-
12156                  * Already one pending, must get ACK back to clear the flag.
12157                  */
12158                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12159                 return (EBUSY);
12160         }
12161         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12162             (add_stream == 0)) {
12163                 /* nothing to do */
12164                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12165                 return (EINVAL);
12166         }
12167         if (send_tsn_req && send_in_req) {
12168                 /* error, can't do that */
12169                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12170                 return (EINVAL);
12171         } else if (send_in_req) {
12172                 can_send_out_req = 1;
12173         }
12174         if (number_entries > (MCLBYTES -
12175             SCTP_MIN_OVERHEAD -
12176             sizeof(struct sctp_chunkhdr) -
12177             sizeof(struct sctp_stream_reset_out_request)) /
12178             sizeof(uint16_t)) {
12179                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12180                 return (ENOMEM);
12181         }
12182         sctp_alloc_a_chunk(stcb, chk);
12183         if (chk == NULL) {
12184                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12185                 return (ENOMEM);
12186         }
12187         chk->copy_by_ref = 0;
12188         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12189         chk->rec.chunk_id.can_take_data = 0;
12190         chk->flags = 0;
12191         chk->asoc = &stcb->asoc;
12192         chk->book_size = sizeof(struct sctp_chunkhdr);
12193         chk->send_size = SCTP_SIZE32(chk->book_size);
12194         chk->book_size_scale = 0;
12195         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12196         if (chk->data == NULL) {
12197                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12198                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12199                 return (ENOMEM);
12200         }
12201         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12202
12203         /* setup chunk parameters */
12204         chk->sent = SCTP_DATAGRAM_UNSENT;
12205         chk->snd_count = 0;
12206         if (stcb->asoc.alternate) {
12207                 chk->whoTo = stcb->asoc.alternate;
12208         } else {
12209                 chk->whoTo = stcb->asoc.primary_destination;
12210         }
12211         atomic_add_int(&chk->whoTo->ref_count, 1);
12212         ch = mtod(chk->data, struct sctp_chunkhdr *);
12213         ch->chunk_type = SCTP_STREAM_RESET;
12214         ch->chunk_flags = 0;
12215         ch->chunk_length = htons(chk->book_size);
12216         SCTP_BUF_LEN(chk->data) = chk->send_size;
12217
12218         seq = stcb->asoc.str_reset_seq_out;
12219         if (can_send_out_req) {
12220                 int ret;
12221
12222                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12223                 if (ret) {
12224                         seq++;
12225                         asoc->stream_reset_outstanding++;
12226                 }
12227         }
12228         if ((add_stream & 1) &&
12229             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12230                 /* Need to allocate more */
12231                 struct sctp_stream_out *oldstream;
12232                 struct sctp_stream_queue_pending *sp, *nsp;
12233                 int i;
12234 #if defined(SCTP_DETAILED_STR_STATS)
12235                 int j;
12236 #endif
12237
12238                 oldstream = stcb->asoc.strmout;
12239                 /* get some more */
12240                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12241                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12242                     SCTP_M_STRMO);
12243                 if (stcb->asoc.strmout == NULL) {
12244                         uint8_t x;
12245
12246                         stcb->asoc.strmout = oldstream;
12247                         /* Turn off the bit */
12248                         x = add_stream & 0xfe;
12249                         add_stream = x;
12250                         goto skip_stuff;
12251                 }
12252                 /*
12253                  * Ok now we proceed with copying the old out stuff and
12254                  * initializing the new stuff.
12255                  */
12256                 SCTP_TCB_SEND_LOCK(stcb);
12257                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12258                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12259                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12260                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12261                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12262                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12263                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12264                         stcb->asoc.strmout[i].sid = i;
12265                         stcb->asoc.strmout[i].state = oldstream[i].state;
12266                         /* FIX ME FIX ME */
12267                         /*
12268                          * This should be a SS_COPY operation FIX ME STREAM
12269                          * SCHEDULER EXPERT
12270                          */
12271                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12272                         /* now anything on those queues? */
12273                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12274                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12275                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12276                         }
12277
12278                 }
12279                 /* now the new streams */
12280                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12281                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12282                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12283                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12284 #if defined(SCTP_DETAILED_STR_STATS)
12285                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12286                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12287                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12288                         }
12289 #else
12290                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12291                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12292 #endif
12293                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12294                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12295                         stcb->asoc.strmout[i].sid = i;
12296                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12297                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12298                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12299                 }
12300                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12301                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12302                 SCTP_TCB_SEND_UNLOCK(stcb);
12303         }
12304 skip_stuff:
12305         if ((add_stream & 1) && (adding_o > 0)) {
12306                 asoc->strm_pending_add_size = adding_o;
12307                 asoc->peer_req_out = peer_asked;
12308                 sctp_add_an_out_stream(chk, seq, adding_o);
12309                 seq++;
12310                 asoc->stream_reset_outstanding++;
12311         }
12312         if ((add_stream & 2) && (adding_i > 0)) {
12313                 sctp_add_an_in_stream(chk, seq, adding_i);
12314                 seq++;
12315                 asoc->stream_reset_outstanding++;
12316         }
12317         if (send_in_req) {
12318                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12319                 seq++;
12320                 asoc->stream_reset_outstanding++;
12321         }
12322         if (send_tsn_req) {
12323                 sctp_add_stream_reset_tsn(chk, seq);
12324                 asoc->stream_reset_outstanding++;
12325         }
12326         asoc->str_reset = chk;
12327         /* insert the chunk for sending */
12328         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12329             chk,
12330             sctp_next);
12331         asoc->ctrl_queue_cnt++;
12332         if (stcb->asoc.send_sack) {
12333                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12334         }
12335         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12336         return (0);
12337 }
12338
12339 void
12340 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12341     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12342     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12343     uint32_t vrf_id, uint16_t port)
12344 {
12345         /* Don't respond to an ABORT with an ABORT. */
12346         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12347                 if (cause)
12348                         sctp_m_freem(cause);
12349                 return;
12350         }
12351         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12352             mflowtype, mflowid, fibnum,
12353             vrf_id, port);
12354         return;
12355 }
12356
12357 void
12358 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12359     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12360     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12361     uint32_t vrf_id, uint16_t port)
12362 {
12363         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12364             mflowtype, mflowid, fibnum,
12365             vrf_id, port);
12366         return;
12367 }
12368
12369 static struct mbuf *
12370 sctp_copy_resume(struct uio *uio,
12371     int max_send_len,
12372     int user_marks_eor,
12373     int *error,
12374     uint32_t *sndout,
12375     struct mbuf **new_tail)
12376 {
12377         struct mbuf *m;
12378
12379         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12380             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12381         if (m == NULL) {
12382                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12383                 *error = ENOBUFS;
12384         } else {
12385                 *sndout = m_length(m, NULL);
12386                 *new_tail = m_last(m);
12387         }
12388         return (m);
12389 }
12390
12391 static int
12392 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12393     struct uio *uio,
12394     int resv_upfront)
12395 {
12396         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12397             resv_upfront, 0);
12398         if (sp->data == NULL) {
12399                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12400                 return (ENOBUFS);
12401         }
12402
12403         sp->tail_mbuf = m_last(sp->data);
12404         return (0);
12405 }
12406
12407
12408
12409 static struct sctp_stream_queue_pending *
12410 sctp_copy_it_in(struct sctp_tcb *stcb,
12411     struct sctp_association *asoc,
12412     struct sctp_sndrcvinfo *srcv,
12413     struct uio *uio,
12414     struct sctp_nets *net,
12415     ssize_t max_send_len,
12416     int user_marks_eor,
12417     int *error)
12418 {
12419
12420         /*-
12421          * This routine must be very careful in its work. Protocol
12422          * processing is up and running so care must be taken to spl...()
12423          * when you need to do something that may effect the stcb/asoc. The
12424          * sb is locked however. When data is copied the protocol processing
12425          * should be enabled since this is a slower operation...
12426          */
12427         struct sctp_stream_queue_pending *sp = NULL;
12428         int resv_in_first;
12429
12430         *error = 0;
12431         /* Now can we send this? */
12432         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12433             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12434             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12435             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12436                 /* got data while shutting down */
12437                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12438                 *error = ECONNRESET;
12439                 goto out_now;
12440         }
12441         sctp_alloc_a_strmoq(stcb, sp);
12442         if (sp == NULL) {
12443                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12444                 *error = ENOMEM;
12445                 goto out_now;
12446         }
12447         sp->act_flags = 0;
12448         sp->sender_all_done = 0;
12449         sp->sinfo_flags = srcv->sinfo_flags;
12450         sp->timetolive = srcv->sinfo_timetolive;
12451         sp->ppid = srcv->sinfo_ppid;
12452         sp->context = srcv->sinfo_context;
12453         sp->fsn = 0;
12454         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12455
12456         sp->sid = srcv->sinfo_stream;
12457         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12458         if ((sp->length == (uint32_t)uio->uio_resid) &&
12459             ((user_marks_eor == 0) ||
12460             (srcv->sinfo_flags & SCTP_EOF) ||
12461             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12462                 sp->msg_is_complete = 1;
12463         } else {
12464                 sp->msg_is_complete = 0;
12465         }
12466         sp->sender_all_done = 0;
12467         sp->some_taken = 0;
12468         sp->put_last_out = 0;
12469         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12470         sp->data = sp->tail_mbuf = NULL;
12471         if (sp->length == 0) {
12472                 goto skip_copy;
12473         }
12474         if (srcv->sinfo_keynumber_valid) {
12475                 sp->auth_keyid = srcv->sinfo_keynumber;
12476         } else {
12477                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12478         }
12479         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12480                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12481                 sp->holds_key_ref = 1;
12482         }
12483         *error = sctp_copy_one(sp, uio, resv_in_first);
12484 skip_copy:
12485         if (*error) {
12486                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12487                 sp = NULL;
12488         } else {
12489                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12490                         sp->net = net;
12491                         atomic_add_int(&sp->net->ref_count, 1);
12492                 } else {
12493                         sp->net = NULL;
12494                 }
12495                 sctp_set_prsctp_policy(sp);
12496         }
12497 out_now:
12498         return (sp);
12499 }
12500
12501
12502 int
12503 sctp_sosend(struct socket *so,
12504     struct sockaddr *addr,
12505     struct uio *uio,
12506     struct mbuf *top,
12507     struct mbuf *control,
12508     int flags,
12509     struct thread *p
12510 )
12511 {
12512         int error, use_sndinfo = 0;
12513         struct sctp_sndrcvinfo sndrcvninfo;
12514         struct sockaddr *addr_to_use;
12515 #if defined(INET) && defined(INET6)
12516         struct sockaddr_in sin;
12517 #endif
12518
12519         if (control) {
12520                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12521                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12522                     sizeof(sndrcvninfo))) {
12523                         /* got one */
12524                         use_sndinfo = 1;
12525                 }
12526         }
12527         addr_to_use = addr;
12528 #if defined(INET) && defined(INET6)
12529         if ((addr) && (addr->sa_family == AF_INET6)) {
12530                 struct sockaddr_in6 *sin6;
12531
12532                 sin6 = (struct sockaddr_in6 *)addr;
12533                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12534                         in6_sin6_2_sin(&sin, sin6);
12535                         addr_to_use = (struct sockaddr *)&sin;
12536                 }
12537         }
12538 #endif
12539         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12540             control,
12541             flags,
12542             use_sndinfo ? &sndrcvninfo : NULL
12543             ,p
12544             );
12545         return (error);
12546 }
12547
12548
12549 int
12550 sctp_lower_sosend(struct socket *so,
12551     struct sockaddr *addr,
12552     struct uio *uio,
12553     struct mbuf *i_pak,
12554     struct mbuf *control,
12555     int flags,
12556     struct sctp_sndrcvinfo *srcv
12557     ,
12558     struct thread *p
12559 )
12560 {
12561         ssize_t sndlen = 0, max_len, local_add_more;
12562         int error, len;
12563         struct mbuf *top = NULL;
12564         int queue_only = 0, queue_only_for_init = 0;
12565         int free_cnt_applied = 0;
12566         int un_sent;
12567         int now_filled = 0;
12568         unsigned int inqueue_bytes = 0;
12569         struct sctp_block_entry be;
12570         struct sctp_inpcb *inp;
12571         struct sctp_tcb *stcb = NULL;
12572         struct timeval now;
12573         struct sctp_nets *net;
12574         struct sctp_association *asoc;
12575         struct sctp_inpcb *t_inp;
12576         int user_marks_eor;
12577         int create_lock_applied = 0;
12578         int nagle_applies = 0;
12579         int some_on_control = 0;
12580         int got_all_of_the_send = 0;
12581         int hold_tcblock = 0;
12582         int non_blocking = 0;
12583         ssize_t local_soresv = 0;
12584         uint16_t port;
12585         uint16_t sinfo_flags;
12586         sctp_assoc_t sinfo_assoc_id;
12587
12588         error = 0;
12589         net = NULL;
12590         stcb = NULL;
12591         asoc = NULL;
12592
12593         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12594         if (inp == NULL) {
12595                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                 error = EINVAL;
12597                 if (i_pak) {
12598                         SCTP_RELEASE_PKT(i_pak);
12599                 }
12600                 return (error);
12601         }
12602         if ((uio == NULL) && (i_pak == NULL)) {
12603                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12604                 return (EINVAL);
12605         }
12606         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12607         atomic_add_int(&inp->total_sends, 1);
12608         if (uio) {
12609                 if (uio->uio_resid < 0) {
12610                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12611                         return (EINVAL);
12612                 }
12613                 sndlen = uio->uio_resid;
12614         } else {
12615                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12616                 sndlen = SCTP_HEADER_LEN(i_pak);
12617         }
12618         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zu\n",
12619             (void *)addr,
12620             sndlen);
12621         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12622             SCTP_IS_LISTENING(inp)) {
12623                 /* The listener can NOT send */
12624                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12625                 error = ENOTCONN;
12626                 goto out_unlocked;
12627         }
12628         /**
12629          * Pre-screen address, if one is given the sin-len
12630          * must be set correctly!
12631          */
12632         if (addr) {
12633                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12634
12635                 switch (raddr->sa.sa_family) {
12636 #ifdef INET
12637                 case AF_INET:
12638                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12639                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12640                                 error = EINVAL;
12641                                 goto out_unlocked;
12642                         }
12643                         port = raddr->sin.sin_port;
12644                         break;
12645 #endif
12646 #ifdef INET6
12647                 case AF_INET6:
12648                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12649                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12650                                 error = EINVAL;
12651                                 goto out_unlocked;
12652                         }
12653                         port = raddr->sin6.sin6_port;
12654                         break;
12655 #endif
12656                 default:
12657                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12658                         error = EAFNOSUPPORT;
12659                         goto out_unlocked;
12660                 }
12661         } else
12662                 port = 0;
12663
12664         if (srcv) {
12665                 sinfo_flags = srcv->sinfo_flags;
12666                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12667                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12668                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12669                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12670                         error = EINVAL;
12671                         goto out_unlocked;
12672                 }
12673                 if (srcv->sinfo_flags)
12674                         SCTP_STAT_INCR(sctps_sends_with_flags);
12675         } else {
12676                 sinfo_flags = inp->def_send.sinfo_flags;
12677                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12678         }
12679         if (flags & MSG_EOR) {
12680                 sinfo_flags |= SCTP_EOR;
12681         }
12682         if (flags & MSG_EOF) {
12683                 sinfo_flags |= SCTP_EOF;
12684         }
12685         if (sinfo_flags & SCTP_SENDALL) {
12686                 /* its a sendall */
12687                 error = sctp_sendall(inp, uio, top, srcv);
12688                 top = NULL;
12689                 goto out_unlocked;
12690         }
12691         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12692                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12693                 error = EINVAL;
12694                 goto out_unlocked;
12695         }
12696         /* now we must find the assoc */
12697         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12698             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12699                 SCTP_INP_RLOCK(inp);
12700                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12701                 if (stcb) {
12702                         SCTP_TCB_LOCK(stcb);
12703                         hold_tcblock = 1;
12704                 }
12705                 SCTP_INP_RUNLOCK(inp);
12706         } else if (sinfo_assoc_id) {
12707                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12708                 if (stcb != NULL) {
12709                         hold_tcblock = 1;
12710                 }
12711         } else if (addr) {
12712                 /*-
12713                  * Since we did not use findep we must
12714                  * increment it, and if we don't find a tcb
12715                  * decrement it.
12716                  */
12717                 SCTP_INP_WLOCK(inp);
12718                 SCTP_INP_INCR_REF(inp);
12719                 SCTP_INP_WUNLOCK(inp);
12720                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12721                 if (stcb == NULL) {
12722                         SCTP_INP_WLOCK(inp);
12723                         SCTP_INP_DECR_REF(inp);
12724                         SCTP_INP_WUNLOCK(inp);
12725                 } else {
12726                         hold_tcblock = 1;
12727                 }
12728         }
12729         if ((stcb == NULL) && (addr)) {
12730                 /* Possible implicit send? */
12731                 SCTP_ASOC_CREATE_LOCK(inp);
12732                 create_lock_applied = 1;
12733                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12734                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12735                         /* Should I really unlock ? */
12736                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12737                         error = EINVAL;
12738                         goto out_unlocked;
12739
12740                 }
12741                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12742                     (addr->sa_family == AF_INET6)) {
12743                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12744                         error = EINVAL;
12745                         goto out_unlocked;
12746                 }
12747                 SCTP_INP_WLOCK(inp);
12748                 SCTP_INP_INCR_REF(inp);
12749                 SCTP_INP_WUNLOCK(inp);
12750                 /* With the lock applied look again */
12751                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12752 #if defined(INET) || defined(INET6)
12753                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12754                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12755                 }
12756 #endif
12757                 if (stcb == NULL) {
12758                         SCTP_INP_WLOCK(inp);
12759                         SCTP_INP_DECR_REF(inp);
12760                         SCTP_INP_WUNLOCK(inp);
12761                 } else {
12762                         hold_tcblock = 1;
12763                 }
12764                 if (error) {
12765                         goto out_unlocked;
12766                 }
12767                 if (t_inp != inp) {
12768                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12769                         error = ENOTCONN;
12770                         goto out_unlocked;
12771                 }
12772         }
12773         if (stcb == NULL) {
12774                 if (addr == NULL) {
12775                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12776                         error = ENOENT;
12777                         goto out_unlocked;
12778                 } else {
12779                         /* We must go ahead and start the INIT process */
12780                         uint32_t vrf_id;
12781
12782                         if ((sinfo_flags & SCTP_ABORT) ||
12783                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12784                                 /*-
12785                                  * User asks to abort a non-existant assoc,
12786                                  * or EOF a non-existant assoc with no data
12787                                  */
12788                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12789                                 error = ENOENT;
12790                                 goto out_unlocked;
12791                         }
12792                         /* get an asoc/stcb struct */
12793                         vrf_id = inp->def_vrf_id;
12794 #ifdef INVARIANTS
12795                         if (create_lock_applied == 0) {
12796                                 panic("Error, should hold create lock and I don't?");
12797                         }
12798 #endif
12799                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12800                             inp->sctp_ep.pre_open_stream_count,
12801                             inp->sctp_ep.port,
12802                             p,
12803                             SCTP_INITIALIZE_AUTH_PARAMS);
12804                         if (stcb == NULL) {
12805                                 /* Error is setup for us in the call */
12806                                 goto out_unlocked;
12807                         }
12808                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12809                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12810                                 /*
12811                                  * Set the connected flag so we can queue
12812                                  * data
12813                                  */
12814                                 soisconnecting(so);
12815                         }
12816                         hold_tcblock = 1;
12817                         if (create_lock_applied) {
12818                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12819                                 create_lock_applied = 0;
12820                         } else {
12821                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12822                         }
12823                         /*
12824                          * Turn on queue only flag to prevent data from
12825                          * being sent
12826                          */
12827                         queue_only = 1;
12828                         asoc = &stcb->asoc;
12829                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12830                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12831
12832                         if (control) {
12833                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12834                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12835                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12836                                         hold_tcblock = 0;
12837                                         stcb = NULL;
12838                                         goto out_unlocked;
12839                                 }
12840                         }
12841                         /* out with the INIT */
12842                         queue_only_for_init = 1;
12843                         /*-
12844                          * we may want to dig in after this call and adjust the MTU
12845                          * value. It defaulted to 1500 (constant) but the ro
12846                          * structure may now have an update and thus we may need to
12847                          * change it BEFORE we append the message.
12848                          */
12849                 }
12850         } else
12851                 asoc = &stcb->asoc;
12852         if (srcv == NULL) {
12853                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12854                 sinfo_flags = srcv->sinfo_flags;
12855                 if (flags & MSG_EOR) {
12856                         sinfo_flags |= SCTP_EOR;
12857                 }
12858                 if (flags & MSG_EOF) {
12859                         sinfo_flags |= SCTP_EOF;
12860                 }
12861         }
12862         if (sinfo_flags & SCTP_ADDR_OVER) {
12863                 if (addr)
12864                         net = sctp_findnet(stcb, addr);
12865                 else
12866                         net = NULL;
12867                 if ((net == NULL) ||
12868                     ((port != 0) && (port != stcb->rport))) {
12869                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12870                         error = EINVAL;
12871                         goto out_unlocked;
12872                 }
12873         } else {
12874                 if (stcb->asoc.alternate) {
12875                         net = stcb->asoc.alternate;
12876                 } else {
12877                         net = stcb->asoc.primary_destination;
12878                 }
12879         }
12880         atomic_add_int(&stcb->total_sends, 1);
12881         /* Keep the stcb from being freed under our feet */
12882         atomic_add_int(&asoc->refcnt, 1);
12883         free_cnt_applied = 1;
12884
12885         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12886                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12887                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12888                         error = EMSGSIZE;
12889                         goto out_unlocked;
12890                 }
12891         }
12892         if (SCTP_SO_IS_NBIO(so)
12893             || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12894             ) {
12895                 non_blocking = 1;
12896         }
12897         /* would we block? */
12898         if (non_blocking) {
12899                 ssize_t amount;
12900
12901                 if (hold_tcblock == 0) {
12902                         SCTP_TCB_LOCK(stcb);
12903                         hold_tcblock = 1;
12904                 }
12905                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12906                 if (user_marks_eor == 0) {
12907                         amount = sndlen;
12908                 } else {
12909                         amount = 1;
12910                 }
12911                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12912                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12913                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12914                         if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12915                                 error = EMSGSIZE;
12916                         else
12917                                 error = EWOULDBLOCK;
12918                         goto out_unlocked;
12919                 }
12920                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12921                 SCTP_TCB_UNLOCK(stcb);
12922                 hold_tcblock = 0;
12923         } else {
12924                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12925         }
12926         local_soresv = sndlen;
12927         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12928                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12929                 error = ECONNRESET;
12930                 goto out_unlocked;
12931         }
12932         if (create_lock_applied) {
12933                 SCTP_ASOC_CREATE_UNLOCK(inp);
12934                 create_lock_applied = 0;
12935         }
12936         /* Is the stream no. valid? */
12937         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12938                 /* Invalid stream number */
12939                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12940                 error = EINVAL;
12941                 goto out_unlocked;
12942         }
12943         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12944             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12945                 /*
12946                  * Can't queue any data while stream reset is underway.
12947                  */
12948                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12949                         error = EAGAIN;
12950                 } else {
12951                         error = EINVAL;
12952                 }
12953                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12954                 goto out_unlocked;
12955         }
12956         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12957             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12958                 queue_only = 1;
12959         }
12960         /* we are now done with all control */
12961         if (control) {
12962                 sctp_m_freem(control);
12963                 control = NULL;
12964         }
12965         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12966             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12967             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12968             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12969                 if (sinfo_flags & SCTP_ABORT) {
12970                         ;
12971                 } else {
12972                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12973                         error = ECONNRESET;
12974                         goto out_unlocked;
12975                 }
12976         }
12977         /* Ok, we will attempt a msgsnd :> */
12978         if (p) {
12979                 p->td_ru.ru_msgsnd++;
12980         }
12981         /* Are we aborting? */
12982         if (sinfo_flags & SCTP_ABORT) {
12983                 struct mbuf *mm;
12984                 ssize_t tot_demand, tot_out = 0, max_out;
12985
12986                 SCTP_STAT_INCR(sctps_sends_with_abort);
12987                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12988                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12989                         /* It has to be up before we abort */
12990                         /* how big is the user initiated abort? */
12991                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12992                         error = EINVAL;
12993                         goto out;
12994                 }
12995                 if (hold_tcblock) {
12996                         SCTP_TCB_UNLOCK(stcb);
12997                         hold_tcblock = 0;
12998                 }
12999                 if (top) {
13000                         struct mbuf *cntm = NULL;
13001
13002                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
13003                         if (sndlen != 0) {
13004                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
13005                                         tot_out += SCTP_BUF_LEN(cntm);
13006                                 }
13007                         }
13008                 } else {
13009                         /* Must fit in a MTU */
13010                         tot_out = sndlen;
13011                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13012                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13013                                 /* To big */
13014                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13015                                 error = EMSGSIZE;
13016                                 goto out;
13017                         }
13018                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
13019                 }
13020                 if (mm == NULL) {
13021                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13022                         error = ENOMEM;
13023                         goto out;
13024                 }
13025                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13026                 max_out -= sizeof(struct sctp_abort_msg);
13027                 if (tot_out > max_out) {
13028                         tot_out = max_out;
13029                 }
13030                 if (mm) {
13031                         struct sctp_paramhdr *ph;
13032
13033                         /* now move forward the data pointer */
13034                         ph = mtod(mm, struct sctp_paramhdr *);
13035                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13036                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
13037                         ph++;
13038                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
13039                         if (top == NULL) {
13040                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13041                                 if (error) {
13042                                         /*-
13043                                          * Here if we can't get his data we
13044                                          * still abort we just don't get to
13045                                          * send the users note :-0
13046                                          */
13047                                         sctp_m_freem(mm);
13048                                         mm = NULL;
13049                                 }
13050                         } else {
13051                                 if (sndlen != 0) {
13052                                         SCTP_BUF_NEXT(mm) = top;
13053                                 }
13054                         }
13055                 }
13056                 if (hold_tcblock == 0) {
13057                         SCTP_TCB_LOCK(stcb);
13058                 }
13059                 atomic_add_int(&stcb->asoc.refcnt, -1);
13060                 free_cnt_applied = 0;
13061                 /* release this lock, otherwise we hang on ourselves */
13062                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13063                 /* now relock the stcb so everything is sane */
13064                 hold_tcblock = 0;
13065                 stcb = NULL;
13066                 /*
13067                  * In this case top is already chained to mm avoid double
13068                  * free, since we free it below if top != NULL and driver
13069                  * would free it after sending the packet out
13070                  */
13071                 if (sndlen != 0) {
13072                         top = NULL;
13073                 }
13074                 goto out_unlocked;
13075         }
13076         /* Calculate the maximum we can send */
13077         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13078         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13079                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13080         } else {
13081                 max_len = 0;
13082         }
13083         if (hold_tcblock) {
13084                 SCTP_TCB_UNLOCK(stcb);
13085                 hold_tcblock = 0;
13086         }
13087         if (asoc->strmout == NULL) {
13088                 /* huh? software error */
13089                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13090                 error = EFAULT;
13091                 goto out_unlocked;
13092         }
13093
13094         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13095         if ((user_marks_eor == 0) &&
13096             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13097                 /* It will NEVER fit */
13098                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13099                 error = EMSGSIZE;
13100                 goto out_unlocked;
13101         }
13102         if ((uio == NULL) && user_marks_eor) {
13103                 /*-
13104                  * We do not support eeor mode for
13105                  * sending with mbuf chains (like sendfile).
13106                  */
13107                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13108                 error = EINVAL;
13109                 goto out_unlocked;
13110         }
13111
13112         if (user_marks_eor) {
13113                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13114         } else {
13115                 /*-
13116                  * For non-eeor the whole message must fit in
13117                  * the socket send buffer.
13118                  */
13119                 local_add_more = sndlen;
13120         }
13121         len = 0;
13122         if (non_blocking) {
13123                 goto skip_preblock;
13124         }
13125         if (((max_len <= local_add_more) &&
13126             ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13127             (max_len == 0) ||
13128             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13129                 /* No room right now ! */
13130                 SOCKBUF_LOCK(&so->so_snd);
13131                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13132                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13133                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13134                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13135                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13136                             inqueue_bytes,
13137                             local_add_more,
13138                             stcb->asoc.stream_queue_cnt,
13139                             stcb->asoc.chunks_on_out_queue,
13140                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13141                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13142                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13143                         }
13144                         be.error = 0;
13145                         stcb->block_entry = &be;
13146                         error = sbwait(&so->so_snd);
13147                         stcb->block_entry = NULL;
13148                         if (error || so->so_error || be.error) {
13149                                 if (error == 0) {
13150                                         if (so->so_error)
13151                                                 error = so->so_error;
13152                                         if (be.error) {
13153                                                 error = be.error;
13154                                         }
13155                                 }
13156                                 SOCKBUF_UNLOCK(&so->so_snd);
13157                                 goto out_unlocked;
13158                         }
13159                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13160                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13161                                     asoc, stcb->asoc.total_output_queue_size);
13162                         }
13163                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13164                                 SOCKBUF_UNLOCK(&so->so_snd);
13165                                 goto out_unlocked;
13166                         }
13167                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13168                 }
13169                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13170                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13171                 } else {
13172                         max_len = 0;
13173                 }
13174                 SOCKBUF_UNLOCK(&so->so_snd);
13175         }
13176
13177 skip_preblock:
13178         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13179                 goto out_unlocked;
13180         }
13181         /*
13182          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13183          * case NOTE: uio will be null when top/mbuf is passed
13184          */
13185         if (sndlen == 0) {
13186                 if (sinfo_flags & SCTP_EOF) {
13187                         got_all_of_the_send = 1;
13188                         goto dataless_eof;
13189                 } else {
13190                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13191                         error = EINVAL;
13192                         goto out;
13193                 }
13194         }
13195         if (top == NULL) {
13196                 struct sctp_stream_queue_pending *sp;
13197                 struct sctp_stream_out *strm;
13198                 uint32_t sndout;
13199
13200                 SCTP_TCB_SEND_LOCK(stcb);
13201                 if ((asoc->stream_locked) &&
13202                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13203                         SCTP_TCB_SEND_UNLOCK(stcb);
13204                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13205                         error = EINVAL;
13206                         goto out;
13207                 }
13208                 SCTP_TCB_SEND_UNLOCK(stcb);
13209
13210                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13211                 if (strm->last_msg_incomplete == 0) {
13212         do_a_copy_in:
13213                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13214                         if (error) {
13215                                 goto out;
13216                         }
13217                         SCTP_TCB_SEND_LOCK(stcb);
13218                         if (sp->msg_is_complete) {
13219                                 strm->last_msg_incomplete = 0;
13220                                 asoc->stream_locked = 0;
13221                         } else {
13222                                 /*
13223                                  * Just got locked to this guy in case of an
13224                                  * interrupt.
13225                                  */
13226                                 strm->last_msg_incomplete = 1;
13227                                 if (stcb->asoc.idata_supported == 0) {
13228                                         asoc->stream_locked = 1;
13229                                         asoc->stream_locked_on = srcv->sinfo_stream;
13230                                 }
13231                                 sp->sender_all_done = 0;
13232                         }
13233                         sctp_snd_sb_alloc(stcb, sp->length);
13234                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13235                         if (sinfo_flags & SCTP_UNORDERED) {
13236                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13237                         }
13238                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13239                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13240                         SCTP_TCB_SEND_UNLOCK(stcb);
13241                 } else {
13242                         SCTP_TCB_SEND_LOCK(stcb);
13243                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13244                         SCTP_TCB_SEND_UNLOCK(stcb);
13245                         if (sp == NULL) {
13246                                 /* ???? Huh ??? last msg is gone */
13247 #ifdef INVARIANTS
13248                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13249 #else
13250                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13251                                 strm->last_msg_incomplete = 0;
13252 #endif
13253                                 goto do_a_copy_in;
13254
13255                         }
13256                 }
13257                 while (uio->uio_resid > 0) {
13258                         /* How much room do we have? */
13259                         struct mbuf *new_tail, *mm;
13260
13261                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13262                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13263                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13264                         else
13265                                 max_len = 0;
13266
13267                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13268                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13269                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13270                                 sndout = 0;
13271                                 new_tail = NULL;
13272                                 if (hold_tcblock) {
13273                                         SCTP_TCB_UNLOCK(stcb);
13274                                         hold_tcblock = 0;
13275                                 }
13276                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13277                                 if ((mm == NULL) || error) {
13278                                         if (mm) {
13279                                                 sctp_m_freem(mm);
13280                                         }
13281                                         goto out;
13282                                 }
13283                                 /* Update the mbuf and count */
13284                                 SCTP_TCB_SEND_LOCK(stcb);
13285                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13286                                         /*
13287                                          * we need to get out. Peer probably
13288                                          * aborted.
13289                                          */
13290                                         sctp_m_freem(mm);
13291                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13292                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13293                                                 error = ECONNRESET;
13294                                         }
13295                                         SCTP_TCB_SEND_UNLOCK(stcb);
13296                                         goto out;
13297                                 }
13298                                 if (sp->tail_mbuf) {
13299                                         /* tack it to the end */
13300                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13301                                         sp->tail_mbuf = new_tail;
13302                                 } else {
13303                                         /* A stolen mbuf */
13304                                         sp->data = mm;
13305                                         sp->tail_mbuf = new_tail;
13306                                 }
13307                                 sctp_snd_sb_alloc(stcb, sndout);
13308                                 atomic_add_int(&sp->length, sndout);
13309                                 len += sndout;
13310                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13311                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13312                                 }
13313
13314                                 /* Did we reach EOR? */
13315                                 if ((uio->uio_resid == 0) &&
13316                                     ((user_marks_eor == 0) ||
13317                                     (sinfo_flags & SCTP_EOF) ||
13318                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13319                                         sp->msg_is_complete = 1;
13320                                 } else {
13321                                         sp->msg_is_complete = 0;
13322                                 }
13323                                 SCTP_TCB_SEND_UNLOCK(stcb);
13324                         }
13325                         if (uio->uio_resid == 0) {
13326                                 /* got it all? */
13327                                 continue;
13328                         }
13329                         /* PR-SCTP? */
13330                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13331                                 /*
13332                                  * This is ugly but we must assure locking
13333                                  * order
13334                                  */
13335                                 if (hold_tcblock == 0) {
13336                                         SCTP_TCB_LOCK(stcb);
13337                                         hold_tcblock = 1;
13338                                 }
13339                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13340                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13341                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13342                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13343                                 else
13344                                         max_len = 0;
13345                                 if (max_len > 0) {
13346                                         continue;
13347                                 }
13348                                 SCTP_TCB_UNLOCK(stcb);
13349                                 hold_tcblock = 0;
13350                         }
13351                         /* wait for space now */
13352                         if (non_blocking) {
13353                                 /* Non-blocking io in place out */
13354                                 goto skip_out_eof;
13355                         }
13356                         /* What about the INIT, send it maybe */
13357                         if (queue_only_for_init) {
13358                                 if (hold_tcblock == 0) {
13359                                         SCTP_TCB_LOCK(stcb);
13360                                         hold_tcblock = 1;
13361                                 }
13362                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13363                                         /* a collision took us forward? */
13364                                         queue_only = 0;
13365                                 } else {
13366                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13367                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13368                                         queue_only = 1;
13369                                 }
13370                         }
13371                         if ((net->flight_size > net->cwnd) &&
13372                             (asoc->sctp_cmt_on_off == 0)) {
13373                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13374                                 queue_only = 1;
13375                         } else if (asoc->ifp_had_enobuf) {
13376                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13377                                 if (net->flight_size > (2 * net->mtu)) {
13378                                         queue_only = 1;
13379                                 }
13380                                 asoc->ifp_had_enobuf = 0;
13381                         }
13382                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13383                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13384                             (stcb->asoc.total_flight > 0) &&
13385                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13386                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13387
13388                                 /*-
13389                                  * Ok, Nagle is set on and we have data outstanding.
13390                                  * Don't send anything and let SACKs drive out the
13391                                  * data unless we have a "full" segment to send.
13392                                  */
13393                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13394                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13395                                 }
13396                                 SCTP_STAT_INCR(sctps_naglequeued);
13397                                 nagle_applies = 1;
13398                         } else {
13399                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13400                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13401                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13402                                 }
13403                                 SCTP_STAT_INCR(sctps_naglesent);
13404                                 nagle_applies = 0;
13405                         }
13406                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13407
13408                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13409                                     nagle_applies, un_sent);
13410                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13411                                     stcb->asoc.total_flight,
13412                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13413                         }
13414                         if (queue_only_for_init)
13415                                 queue_only_for_init = 0;
13416                         if ((queue_only == 0) && (nagle_applies == 0)) {
13417                                 /*-
13418                                  * need to start chunk output
13419                                  * before blocking.. note that if
13420                                  * a lock is already applied, then
13421                                  * the input via the net is happening
13422                                  * and I don't need to start output :-D
13423                                  */
13424                                 if (hold_tcblock == 0) {
13425                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13426                                                 hold_tcblock = 1;
13427                                                 sctp_chunk_output(inp,
13428                                                     stcb,
13429                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13430                                         }
13431                                 } else {
13432                                         sctp_chunk_output(inp,
13433                                             stcb,
13434                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13435                                 }
13436                         }
13437                         if (hold_tcblock == 1) {
13438                                 SCTP_TCB_UNLOCK(stcb);
13439                                 hold_tcblock = 0;
13440                         }
13441                         SOCKBUF_LOCK(&so->so_snd);
13442                         /*-
13443                          * This is a bit strange, but I think it will
13444                          * work. The total_output_queue_size is locked and
13445                          * protected by the TCB_LOCK, which we just released.
13446                          * There is a race that can occur between releasing it
13447                          * above, and me getting the socket lock, where sacks
13448                          * come in but we have not put the SB_WAIT on the
13449                          * so_snd buffer to get the wakeup. After the LOCK
13450                          * is applied the sack_processing will also need to
13451                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13452                          * once we have the socket buffer lock if we recheck the
13453                          * size we KNOW we will get to sleep safely with the
13454                          * wakeup flag in place.
13455                          */
13456                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13457                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13458                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13459                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13460                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13461                                             asoc, uio->uio_resid);
13462                                 }
13463                                 be.error = 0;
13464                                 stcb->block_entry = &be;
13465                                 error = sbwait(&so->so_snd);
13466                                 stcb->block_entry = NULL;
13467
13468                                 if (error || so->so_error || be.error) {
13469                                         if (error == 0) {
13470                                                 if (so->so_error)
13471                                                         error = so->so_error;
13472                                                 if (be.error) {
13473                                                         error = be.error;
13474                                                 }
13475                                         }
13476                                         SOCKBUF_UNLOCK(&so->so_snd);
13477                                         goto out_unlocked;
13478                                 }
13479
13480                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13481                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13482                                             asoc, stcb->asoc.total_output_queue_size);
13483                                 }
13484                         }
13485                         SOCKBUF_UNLOCK(&so->so_snd);
13486                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13487                                 goto out_unlocked;
13488                         }
13489                 }
13490                 SCTP_TCB_SEND_LOCK(stcb);
13491                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13492                         SCTP_TCB_SEND_UNLOCK(stcb);
13493                         goto out_unlocked;
13494                 }
13495                 if (sp) {
13496                         if (sp->msg_is_complete == 0) {
13497                                 strm->last_msg_incomplete = 1;
13498                                 if (stcb->asoc.idata_supported == 0) {
13499                                         asoc->stream_locked = 1;
13500                                         asoc->stream_locked_on = srcv->sinfo_stream;
13501                                 }
13502                         } else {
13503                                 sp->sender_all_done = 1;
13504                                 strm->last_msg_incomplete = 0;
13505                                 asoc->stream_locked = 0;
13506                         }
13507                 } else {
13508                         SCTP_PRINTF("Huh no sp TSNH?\n");
13509                         strm->last_msg_incomplete = 0;
13510                         asoc->stream_locked = 0;
13511                 }
13512                 SCTP_TCB_SEND_UNLOCK(stcb);
13513                 if (uio->uio_resid == 0) {
13514                         got_all_of_the_send = 1;
13515                 }
13516         } else {
13517                 /* We send in a 0, since we do NOT have any locks */
13518                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13519                 top = NULL;
13520                 if (sinfo_flags & SCTP_EOF) {
13521                         /*
13522                          * This should only happen for Panda for the mbuf
13523                          * send case, which does NOT yet support EEOR mode.
13524                          * Thus, we can just set this flag to do the proper
13525                          * EOF handling.
13526                          */
13527                         got_all_of_the_send = 1;
13528                 }
13529         }
13530         if (error) {
13531                 goto out;
13532         }
13533 dataless_eof:
13534         /* EOF thing ? */
13535         if ((sinfo_flags & SCTP_EOF) &&
13536             (got_all_of_the_send == 1)) {
13537                 SCTP_STAT_INCR(sctps_sends_with_eof);
13538                 error = 0;
13539                 if (hold_tcblock == 0) {
13540                         SCTP_TCB_LOCK(stcb);
13541                         hold_tcblock = 1;
13542                 }
13543                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13544                     TAILQ_EMPTY(&asoc->sent_queue) &&
13545                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13546                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13547                                 goto abort_anyway;
13548                         }
13549                         /* there is nothing queued to send, so I'm done... */
13550                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13551                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13552                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13553                                 struct sctp_nets *netp;
13554
13555                                 /* only send SHUTDOWN the first time through */
13556                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13557                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13558                                 }
13559                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13560                                 sctp_stop_timers_for_shutdown(stcb);
13561                                 if (stcb->asoc.alternate) {
13562                                         netp = stcb->asoc.alternate;
13563                                 } else {
13564                                         netp = stcb->asoc.primary_destination;
13565                                 }
13566                                 sctp_send_shutdown(stcb, netp);
13567                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13568                                     netp);
13569                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13570                                     asoc->primary_destination);
13571                         }
13572                 } else {
13573                         /*-
13574                          * we still got (or just got) data to send, so set
13575                          * SHUTDOWN_PENDING
13576                          */
13577                         /*-
13578                          * XXX sockets draft says that SCTP_EOF should be
13579                          * sent with no data.  currently, we will allow user
13580                          * data to be sent first and move to
13581                          * SHUTDOWN-PENDING
13582                          */
13583                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13584                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13585                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13586                                 if (hold_tcblock == 0) {
13587                                         SCTP_TCB_LOCK(stcb);
13588                                         hold_tcblock = 1;
13589                                 }
13590                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13591                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13592                                 }
13593                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13594                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13595                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13596                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13597                                         struct mbuf *op_err;
13598                                         char msg[SCTP_DIAG_INFO_LEN];
13599
13600                         abort_anyway:
13601                                         if (free_cnt_applied) {
13602                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13603                                                 free_cnt_applied = 0;
13604                                         }
13605                                         snprintf(msg, sizeof(msg),
13606                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13607                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13608                                             msg);
13609                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13610                                             op_err, SCTP_SO_LOCKED);
13611                                         /*
13612                                          * now relock the stcb so everything
13613                                          * is sane
13614                                          */
13615                                         hold_tcblock = 0;
13616                                         stcb = NULL;
13617                                         goto out;
13618                                 }
13619                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13620                                     asoc->primary_destination);
13621                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13622                         }
13623                 }
13624         }
13625 skip_out_eof:
13626         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13627                 some_on_control = 1;
13628         }
13629         if (queue_only_for_init) {
13630                 if (hold_tcblock == 0) {
13631                         SCTP_TCB_LOCK(stcb);
13632                         hold_tcblock = 1;
13633                 }
13634                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13635                         /* a collision took us forward? */
13636                         queue_only = 0;
13637                 } else {
13638                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13639                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13640                         queue_only = 1;
13641                 }
13642         }
13643         if ((net->flight_size > net->cwnd) &&
13644             (stcb->asoc.sctp_cmt_on_off == 0)) {
13645                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13646                 queue_only = 1;
13647         } else if (asoc->ifp_had_enobuf) {
13648                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13649                 if (net->flight_size > (2 * net->mtu)) {
13650                         queue_only = 1;
13651                 }
13652                 asoc->ifp_had_enobuf = 0;
13653         }
13654         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13655         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13656             (stcb->asoc.total_flight > 0) &&
13657             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13658             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13659                 /*-
13660                  * Ok, Nagle is set on and we have data outstanding.
13661                  * Don't send anything and let SACKs drive out the
13662                  * data unless wen have a "full" segment to send.
13663                  */
13664                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13665                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13666                 }
13667                 SCTP_STAT_INCR(sctps_naglequeued);
13668                 nagle_applies = 1;
13669         } else {
13670                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13671                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13672                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13673                 }
13674                 SCTP_STAT_INCR(sctps_naglesent);
13675                 nagle_applies = 0;
13676         }
13677         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13678                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13679                     nagle_applies, un_sent);
13680                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13681                     stcb->asoc.total_flight,
13682                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13683         }
13684         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13685                 /* we can attempt to send too. */
13686                 if (hold_tcblock == 0) {
13687                         /*
13688                          * If there is activity recv'ing sacks no need to
13689                          * send
13690                          */
13691                         if (SCTP_TCB_TRYLOCK(stcb)) {
13692                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13693                                 hold_tcblock = 1;
13694                         }
13695                 } else {
13696                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13697                 }
13698         } else if ((queue_only == 0) &&
13699                     (stcb->asoc.peers_rwnd == 0) &&
13700             (stcb->asoc.total_flight == 0)) {
13701                 /* We get to have a probe outstanding */
13702                 if (hold_tcblock == 0) {
13703                         hold_tcblock = 1;
13704                         SCTP_TCB_LOCK(stcb);
13705                 }
13706                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13707         } else if (some_on_control) {
13708                 int num_out, reason, frag_point;
13709
13710                 /* Here we do control only */
13711                 if (hold_tcblock == 0) {
13712                         hold_tcblock = 1;
13713                         SCTP_TCB_LOCK(stcb);
13714                 }
13715                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13716                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13717                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13718         }
13719         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13720             queue_only, stcb->asoc.peers_rwnd, un_sent,
13721             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13722             stcb->asoc.total_output_queue_size, error);
13723
13724 out:
13725 out_unlocked:
13726
13727         if (local_soresv && stcb) {
13728                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13729         }
13730         if (create_lock_applied) {
13731                 SCTP_ASOC_CREATE_UNLOCK(inp);
13732         }
13733         if ((stcb) && hold_tcblock) {
13734                 SCTP_TCB_UNLOCK(stcb);
13735         }
13736         if (stcb && free_cnt_applied) {
13737                 atomic_add_int(&stcb->asoc.refcnt, -1);
13738         }
13739 #ifdef INVARIANTS
13740         if (stcb) {
13741                 if (mtx_owned(&stcb->tcb_mtx)) {
13742                         panic("Leaving with tcb mtx owned?");
13743                 }
13744                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13745                         panic("Leaving with tcb send mtx owned?");
13746                 }
13747         }
13748 #endif
13749         if (top) {
13750                 sctp_m_freem(top);
13751         }
13752         if (control) {
13753                 sctp_m_freem(control);
13754         }
13755         return (error);
13756 }
13757
13758
13759 /*
13760  * generate an AUTHentication chunk, if required
13761  */
13762 struct mbuf *
13763 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13764     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13765     struct sctp_tcb *stcb, uint8_t chunk)
13766 {
13767         struct mbuf *m_auth;
13768         struct sctp_auth_chunk *auth;
13769         int chunk_len;
13770         struct mbuf *cn;
13771
13772         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13773             (stcb == NULL))
13774                 return (m);
13775
13776         if (stcb->asoc.auth_supported == 0) {
13777                 return (m);
13778         }
13779         /* does the requested chunk require auth? */
13780         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13781                 return (m);
13782         }
13783         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13784         if (m_auth == NULL) {
13785                 /* no mbuf's */
13786                 return (m);
13787         }
13788         /* reserve some space if this will be the first mbuf */
13789         if (m == NULL)
13790                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13791         /* fill in the AUTH chunk details */
13792         auth = mtod(m_auth, struct sctp_auth_chunk *);
13793         memset(auth, 0, sizeof(*auth));
13794         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13795         auth->ch.chunk_flags = 0;
13796         chunk_len = sizeof(*auth) +
13797             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13798         auth->ch.chunk_length = htons(chunk_len);
13799         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13800         /* key id and hmac digest will be computed and filled in upon send */
13801
13802         /* save the offset where the auth was inserted into the chain */
13803         *offset = 0;
13804         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13805                 *offset += SCTP_BUF_LEN(cn);
13806         }
13807
13808         /* update length and return pointer to the auth chunk */
13809         SCTP_BUF_LEN(m_auth) = chunk_len;
13810         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13811         if (auth_ret != NULL)
13812                 *auth_ret = auth;
13813
13814         return (m);
13815 }
13816
13817 #ifdef INET6
13818 int
13819 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13820 {
13821         struct nd_prefix *pfx = NULL;
13822         struct nd_pfxrouter *pfxrtr = NULL;
13823         struct sockaddr_in6 gw6;
13824
13825         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13826                 return (0);
13827
13828         /* get prefix entry of address */
13829         ND6_RLOCK();
13830         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13831                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13832                         continue;
13833                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13834                     &src6->sin6_addr, &pfx->ndpr_mask))
13835                         break;
13836         }
13837         /* no prefix entry in the prefix list */
13838         if (pfx == NULL) {
13839                 ND6_RUNLOCK();
13840                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13841                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13842                 return (0);
13843         }
13844
13845         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13846         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13847
13848         /* search installed gateway from prefix entry */
13849         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13850                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13851                 gw6.sin6_family = AF_INET6;
13852                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13853                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13854                     sizeof(struct in6_addr));
13855                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13856                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13857                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13858                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13859                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13860                         ND6_RUNLOCK();
13861                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13862                         return (1);
13863                 }
13864         }
13865         ND6_RUNLOCK();
13866         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13867         return (0);
13868 }
13869 #endif
13870
13871 int
13872 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13873 {
13874 #ifdef INET
13875         struct sockaddr_in *sin, *mask;
13876         struct ifaddr *ifa;
13877         struct in_addr srcnetaddr, gwnetaddr;
13878
13879         if (ro == NULL || ro->ro_rt == NULL ||
13880             sifa->address.sa.sa_family != AF_INET) {
13881                 return (0);
13882         }
13883         ifa = (struct ifaddr *)sifa->ifa;
13884         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13885         sin = &sifa->address.sin;
13886         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13887         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13888         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13889         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13890
13891         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13892         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13893         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13894         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13895         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13896         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13897                 return (1);
13898         }
13899 #endif
13900         return (0);
13901 }