sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/udp.h>
  53 #include <machine/in_cksum.h>
  54
  55
  56
  57 #define SCTP_MAX_GAPS_INARRAY 4
  58 struct sack_track {
  59         uint8_t right_edge;     /* mergable on the right edge */
  60         uint8_t left_edge;      /* mergable on the left edge */
  61         uint8_t num_entries;
  62         uint8_t spare;
  63         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  64 };
  65
  66 struct sack_track sack_array[256] = {
  67         {0, 0, 0, 0,            /* 0x00 */
  68                 {{0, 0},
  69                 {0, 0},
  70                 {0, 0},
  71                 {0, 0}
  72                 }
  73         },
  74         {1, 0, 1, 0,            /* 0x01 */
  75                 {{0, 0},
  76                 {0, 0},
  77                 {0, 0},
  78                 {0, 0}
  79                 }
  80         },
  81         {0, 0, 1, 0,            /* 0x02 */
  82                 {{1, 1},
  83                 {0, 0},
  84                 {0, 0},
  85                 {0, 0}
  86                 }
  87         },
  88         {1, 0, 1, 0,            /* 0x03 */
  89                 {{0, 1},
  90                 {0, 0},
  91                 {0, 0},
  92                 {0, 0}
  93                 }
  94         },
  95         {0, 0, 1, 0,            /* 0x04 */
  96                 {{2, 2},
  97                 {0, 0},
  98                 {0, 0},
  99                 {0, 0}
 100                 }
 101         },
 102         {1, 0, 2, 0,            /* 0x05 */
 103                 {{0, 0},
 104                 {2, 2},
 105                 {0, 0},
 106                 {0, 0}
 107                 }
 108         },
 109         {0, 0, 1, 0,            /* 0x06 */
 110                 {{1, 2},
 111                 {0, 0},
 112                 {0, 0},
 113                 {0, 0}
 114                 }
 115         },
 116         {1, 0, 1, 0,            /* 0x07 */
 117                 {{0, 2},
 118                 {0, 0},
 119                 {0, 0},
 120                 {0, 0}
 121                 }
 122         },
 123         {0, 0, 1, 0,            /* 0x08 */
 124                 {{3, 3},
 125                 {0, 0},
 126                 {0, 0},
 127                 {0, 0}
 128                 }
 129         },
 130         {1, 0, 2, 0,            /* 0x09 */
 131                 {{0, 0},
 132                 {3, 3},
 133                 {0, 0},
 134                 {0, 0}
 135                 }
 136         },
 137         {0, 0, 2, 0,            /* 0x0a */
 138                 {{1, 1},
 139                 {3, 3},
 140                 {0, 0},
 141                 {0, 0}
 142                 }
 143         },
 144         {1, 0, 2, 0,            /* 0x0b */
 145                 {{0, 1},
 146                 {3, 3},
 147                 {0, 0},
 148                 {0, 0}
 149                 }
 150         },
 151         {0, 0, 1, 0,            /* 0x0c */
 152                 {{2, 3},
 153                 {0, 0},
 154                 {0, 0},
 155                 {0, 0}
 156                 }
 157         },
 158         {1, 0, 2, 0,            /* 0x0d */
 159                 {{0, 0},
 160                 {2, 3},
 161                 {0, 0},
 162                 {0, 0}
 163                 }
 164         },
 165         {0, 0, 1, 0,            /* 0x0e */
 166                 {{1, 3},
 167                 {0, 0},
 168                 {0, 0},
 169                 {0, 0}
 170                 }
 171         },
 172         {1, 0, 1, 0,            /* 0x0f */
 173                 {{0, 3},
 174                 {0, 0},
 175                 {0, 0},
 176                 {0, 0}
 177                 }
 178         },
 179         {0, 0, 1, 0,            /* 0x10 */
 180                 {{4, 4},
 181                 {0, 0},
 182                 {0, 0},
 183                 {0, 0}
 184                 }
 185         },
 186         {1, 0, 2, 0,            /* 0x11 */
 187                 {{0, 0},
 188                 {4, 4},
 189                 {0, 0},
 190                 {0, 0}
 191                 }
 192         },
 193         {0, 0, 2, 0,            /* 0x12 */
 194                 {{1, 1},
 195                 {4, 4},
 196                 {0, 0},
 197                 {0, 0}
 198                 }
 199         },
 200         {1, 0, 2, 0,            /* 0x13 */
 201                 {{0, 1},
 202                 {4, 4},
 203                 {0, 0},
 204                 {0, 0}
 205                 }
 206         },
 207         {0, 0, 2, 0,            /* 0x14 */
 208                 {{2, 2},
 209                 {4, 4},
 210                 {0, 0},
 211                 {0, 0}
 212                 }
 213         },
 214         {1, 0, 3, 0,            /* 0x15 */
 215                 {{0, 0},
 216                 {2, 2},
 217                 {4, 4},
 218                 {0, 0}
 219                 }
 220         },
 221         {0, 0, 2, 0,            /* 0x16 */
 222                 {{1, 2},
 223                 {4, 4},
 224                 {0, 0},
 225                 {0, 0}
 226                 }
 227         },
 228         {1, 0, 2, 0,            /* 0x17 */
 229                 {{0, 2},
 230                 {4, 4},
 231                 {0, 0},
 232                 {0, 0}
 233                 }
 234         },
 235         {0, 0, 1, 0,            /* 0x18 */
 236                 {{3, 4},
 237                 {0, 0},
 238                 {0, 0},
 239                 {0, 0}
 240                 }
 241         },
 242         {1, 0, 2, 0,            /* 0x19 */
 243                 {{0, 0},
 244                 {3, 4},
 245                 {0, 0},
 246                 {0, 0}
 247                 }
 248         },
 249         {0, 0, 2, 0,            /* 0x1a */
 250                 {{1, 1},
 251                 {3, 4},
 252                 {0, 0},
 253                 {0, 0}
 254                 }
 255         },
 256         {1, 0, 2, 0,            /* 0x1b */
 257                 {{0, 1},
 258                 {3, 4},
 259                 {0, 0},
 260                 {0, 0}
 261                 }
 262         },
 263         {0, 0, 1, 0,            /* 0x1c */
 264                 {{2, 4},
 265                 {0, 0},
 266                 {0, 0},
 267                 {0, 0}
 268                 }
 269         },
 270         {1, 0, 2, 0,            /* 0x1d */
 271                 {{0, 0},
 272                 {2, 4},
 273                 {0, 0},
 274                 {0, 0}
 275                 }
 276         },
 277         {0, 0, 1, 0,            /* 0x1e */
 278                 {{1, 4},
 279                 {0, 0},
 280                 {0, 0},
 281                 {0, 0}
 282                 }
 283         },
 284         {1, 0, 1, 0,            /* 0x1f */
 285                 {{0, 4},
 286                 {0, 0},
 287                 {0, 0},
 288                 {0, 0}
 289                 }
 290         },
 291         {0, 0, 1, 0,            /* 0x20 */
 292                 {{5, 5},
 293                 {0, 0},
 294                 {0, 0},
 295                 {0, 0}
 296                 }
 297         },
 298         {1, 0, 2, 0,            /* 0x21 */
 299                 {{0, 0},
 300                 {5, 5},
 301                 {0, 0},
 302                 {0, 0}
 303                 }
 304         },
 305         {0, 0, 2, 0,            /* 0x22 */
 306                 {{1, 1},
 307                 {5, 5},
 308                 {0, 0},
 309                 {0, 0}
 310                 }
 311         },
 312         {1, 0, 2, 0,            /* 0x23 */
 313                 {{0, 1},
 314                 {5, 5},
 315                 {0, 0},
 316                 {0, 0}
 317                 }
 318         },
 319         {0, 0, 2, 0,            /* 0x24 */
 320                 {{2, 2},
 321                 {5, 5},
 322                 {0, 0},
 323                 {0, 0}
 324                 }
 325         },
 326         {1, 0, 3, 0,            /* 0x25 */
 327                 {{0, 0},
 328                 {2, 2},
 329                 {5, 5},
 330                 {0, 0}
 331                 }
 332         },
 333         {0, 0, 2, 0,            /* 0x26 */
 334                 {{1, 2},
 335                 {5, 5},
 336                 {0, 0},
 337                 {0, 0}
 338                 }
 339         },
 340         {1, 0, 2, 0,            /* 0x27 */
 341                 {{0, 2},
 342                 {5, 5},
 343                 {0, 0},
 344                 {0, 0}
 345                 }
 346         },
 347         {0, 0, 2, 0,            /* 0x28 */
 348                 {{3, 3},
 349                 {5, 5},
 350                 {0, 0},
 351                 {0, 0}
 352                 }
 353         },
 354         {1, 0, 3, 0,            /* 0x29 */
 355                 {{0, 0},
 356                 {3, 3},
 357                 {5, 5},
 358                 {0, 0}
 359                 }
 360         },
 361         {0, 0, 3, 0,            /* 0x2a */
 362                 {{1, 1},
 363                 {3, 3},
 364                 {5, 5},
 365                 {0, 0}
 366                 }
 367         },
 368         {1, 0, 3, 0,            /* 0x2b */
 369                 {{0, 1},
 370                 {3, 3},
 371                 {5, 5},
 372                 {0, 0}
 373                 }
 374         },
 375         {0, 0, 2, 0,            /* 0x2c */
 376                 {{2, 3},
 377                 {5, 5},
 378                 {0, 0},
 379                 {0, 0}
 380                 }
 381         },
 382         {1, 0, 3, 0,            /* 0x2d */
 383                 {{0, 0},
 384                 {2, 3},
 385                 {5, 5},
 386                 {0, 0}
 387                 }
 388         },
 389         {0, 0, 2, 0,            /* 0x2e */
 390                 {{1, 3},
 391                 {5, 5},
 392                 {0, 0},
 393                 {0, 0}
 394                 }
 395         },
 396         {1, 0, 2, 0,            /* 0x2f */
 397                 {{0, 3},
 398                 {5, 5},
 399                 {0, 0},
 400                 {0, 0}
 401                 }
 402         },
 403         {0, 0, 1, 0,            /* 0x30 */
 404                 {{4, 5},
 405                 {0, 0},
 406                 {0, 0},
 407                 {0, 0}
 408                 }
 409         },
 410         {1, 0, 2, 0,            /* 0x31 */
 411                 {{0, 0},
 412                 {4, 5},
 413                 {0, 0},
 414                 {0, 0}
 415                 }
 416         },
 417         {0, 0, 2, 0,            /* 0x32 */
 418                 {{1, 1},
 419                 {4, 5},
 420                 {0, 0},
 421                 {0, 0}
 422                 }
 423         },
 424         {1, 0, 2, 0,            /* 0x33 */
 425                 {{0, 1},
 426                 {4, 5},
 427                 {0, 0},
 428                 {0, 0}
 429                 }
 430         },
 431         {0, 0, 2, 0,            /* 0x34 */
 432                 {{2, 2},
 433                 {4, 5},
 434                 {0, 0},
 435                 {0, 0}
 436                 }
 437         },
 438         {1, 0, 3, 0,            /* 0x35 */
 439                 {{0, 0},
 440                 {2, 2},
 441                 {4, 5},
 442                 {0, 0}
 443                 }
 444         },
 445         {0, 0, 2, 0,            /* 0x36 */
 446                 {{1, 2},
 447                 {4, 5},
 448                 {0, 0},
 449                 {0, 0}
 450                 }
 451         },
 452         {1, 0, 2, 0,            /* 0x37 */
 453                 {{0, 2},
 454                 {4, 5},
 455                 {0, 0},
 456                 {0, 0}
 457                 }
 458         },
 459         {0, 0, 1, 0,            /* 0x38 */
 460                 {{3, 5},
 461                 {0, 0},
 462                 {0, 0},
 463                 {0, 0}
 464                 }
 465         },
 466         {1, 0, 2, 0,            /* 0x39 */
 467                 {{0, 0},
 468                 {3, 5},
 469                 {0, 0},
 470                 {0, 0}
 471                 }
 472         },
 473         {0, 0, 2, 0,            /* 0x3a */
 474                 {{1, 1},
 475                 {3, 5},
 476                 {0, 0},
 477                 {0, 0}
 478                 }
 479         },
 480         {1, 0, 2, 0,            /* 0x3b */
 481                 {{0, 1},
 482                 {3, 5},
 483                 {0, 0},
 484                 {0, 0}
 485                 }
 486         },
 487         {0, 0, 1, 0,            /* 0x3c */
 488                 {{2, 5},
 489                 {0, 0},
 490                 {0, 0},
 491                 {0, 0}
 492                 }
 493         },
 494         {1, 0, 2, 0,            /* 0x3d */
 495                 {{0, 0},
 496                 {2, 5},
 497                 {0, 0},
 498                 {0, 0}
 499                 }
 500         },
 501         {0, 0, 1, 0,            /* 0x3e */
 502                 {{1, 5},
 503                 {0, 0},
 504                 {0, 0},
 505                 {0, 0}
 506                 }
 507         },
 508         {1, 0, 1, 0,            /* 0x3f */
 509                 {{0, 5},
 510                 {0, 0},
 511                 {0, 0},
 512                 {0, 0}
 513                 }
 514         },
 515         {0, 0, 1, 0,            /* 0x40 */
 516                 {{6, 6},
 517                 {0, 0},
 518                 {0, 0},
 519                 {0, 0}
 520                 }
 521         },
 522         {1, 0, 2, 0,            /* 0x41 */
 523                 {{0, 0},
 524                 {6, 6},
 525                 {0, 0},
 526                 {0, 0}
 527                 }
 528         },
 529         {0, 0, 2, 0,            /* 0x42 */
 530                 {{1, 1},
 531                 {6, 6},
 532                 {0, 0},
 533                 {0, 0}
 534                 }
 535         },
 536         {1, 0, 2, 0,            /* 0x43 */
 537                 {{0, 1},
 538                 {6, 6},
 539                 {0, 0},
 540                 {0, 0}
 541                 }
 542         },
 543         {0, 0, 2, 0,            /* 0x44 */
 544                 {{2, 2},
 545                 {6, 6},
 546                 {0, 0},
 547                 {0, 0}
 548                 }
 549         },
 550         {1, 0, 3, 0,            /* 0x45 */
 551                 {{0, 0},
 552                 {2, 2},
 553                 {6, 6},
 554                 {0, 0}
 555                 }
 556         },
 557         {0, 0, 2, 0,            /* 0x46 */
 558                 {{1, 2},
 559                 {6, 6},
 560                 {0, 0},
 561                 {0, 0}
 562                 }
 563         },
 564         {1, 0, 2, 0,            /* 0x47 */
 565                 {{0, 2},
 566                 {6, 6},
 567                 {0, 0},
 568                 {0, 0}
 569                 }
 570         },
 571         {0, 0, 2, 0,            /* 0x48 */
 572                 {{3, 3},
 573                 {6, 6},
 574                 {0, 0},
 575                 {0, 0}
 576                 }
 577         },
 578         {1, 0, 3, 0,            /* 0x49 */
 579                 {{0, 0},
 580                 {3, 3},
 581                 {6, 6},
 582                 {0, 0}
 583                 }
 584         },
 585         {0, 0, 3, 0,            /* 0x4a */
 586                 {{1, 1},
 587                 {3, 3},
 588                 {6, 6},
 589                 {0, 0}
 590                 }
 591         },
 592         {1, 0, 3, 0,            /* 0x4b */
 593                 {{0, 1},
 594                 {3, 3},
 595                 {6, 6},
 596                 {0, 0}
 597                 }
 598         },
 599         {0, 0, 2, 0,            /* 0x4c */
 600                 {{2, 3},
 601                 {6, 6},
 602                 {0, 0},
 603                 {0, 0}
 604                 }
 605         },
 606         {1, 0, 3, 0,            /* 0x4d */
 607                 {{0, 0},
 608                 {2, 3},
 609                 {6, 6},
 610                 {0, 0}
 611                 }
 612         },
 613         {0, 0, 2, 0,            /* 0x4e */
 614                 {{1, 3},
 615                 {6, 6},
 616                 {0, 0},
 617                 {0, 0}
 618                 }
 619         },
 620         {1, 0, 2, 0,            /* 0x4f */
 621                 {{0, 3},
 622                 {6, 6},
 623                 {0, 0},
 624                 {0, 0}
 625                 }
 626         },
 627         {0, 0, 2, 0,            /* 0x50 */
 628                 {{4, 4},
 629                 {6, 6},
 630                 {0, 0},
 631                 {0, 0}
 632                 }
 633         },
 634         {1, 0, 3, 0,            /* 0x51 */
 635                 {{0, 0},
 636                 {4, 4},
 637                 {6, 6},
 638                 {0, 0}
 639                 }
 640         },
 641         {0, 0, 3, 0,            /* 0x52 */
 642                 {{1, 1},
 643                 {4, 4},
 644                 {6, 6},
 645                 {0, 0}
 646                 }
 647         },
 648         {1, 0, 3, 0,            /* 0x53 */
 649                 {{0, 1},
 650                 {4, 4},
 651                 {6, 6},
 652                 {0, 0}
 653                 }
 654         },
 655         {0, 0, 3, 0,            /* 0x54 */
 656                 {{2, 2},
 657                 {4, 4},
 658                 {6, 6},
 659                 {0, 0}
 660                 }
 661         },
 662         {1, 0, 4, 0,            /* 0x55 */
 663                 {{0, 0},
 664                 {2, 2},
 665                 {4, 4},
 666                 {6, 6}
 667                 }
 668         },
 669         {0, 0, 3, 0,            /* 0x56 */
 670                 {{1, 2},
 671                 {4, 4},
 672                 {6, 6},
 673                 {0, 0}
 674                 }
 675         },
 676         {1, 0, 3, 0,            /* 0x57 */
 677                 {{0, 2},
 678                 {4, 4},
 679                 {6, 6},
 680                 {0, 0}
 681                 }
 682         },
 683         {0, 0, 2, 0,            /* 0x58 */
 684                 {{3, 4},
 685                 {6, 6},
 686                 {0, 0},
 687                 {0, 0}
 688                 }
 689         },
 690         {1, 0, 3, 0,            /* 0x59 */
 691                 {{0, 0},
 692                 {3, 4},
 693                 {6, 6},
 694                 {0, 0}
 695                 }
 696         },
 697         {0, 0, 3, 0,            /* 0x5a */
 698                 {{1, 1},
 699                 {3, 4},
 700                 {6, 6},
 701                 {0, 0}
 702                 }
 703         },
 704         {1, 0, 3, 0,            /* 0x5b */
 705                 {{0, 1},
 706                 {3, 4},
 707                 {6, 6},
 708                 {0, 0}
 709                 }
 710         },
 711         {0, 0, 2, 0,            /* 0x5c */
 712                 {{2, 4},
 713                 {6, 6},
 714                 {0, 0},
 715                 {0, 0}
 716                 }
 717         },
 718         {1, 0, 3, 0,            /* 0x5d */
 719                 {{0, 0},
 720                 {2, 4},
 721                 {6, 6},
 722                 {0, 0}
 723                 }
 724         },
 725         {0, 0, 2, 0,            /* 0x5e */
 726                 {{1, 4},
 727                 {6, 6},
 728                 {0, 0},
 729                 {0, 0}
 730                 }
 731         },
 732         {1, 0, 2, 0,            /* 0x5f */
 733                 {{0, 4},
 734                 {6, 6},
 735                 {0, 0},
 736                 {0, 0}
 737                 }
 738         },
 739         {0, 0, 1, 0,            /* 0x60 */
 740                 {{5, 6},
 741                 {0, 0},
 742                 {0, 0},
 743                 {0, 0}
 744                 }
 745         },
 746         {1, 0, 2, 0,            /* 0x61 */
 747                 {{0, 0},
 748                 {5, 6},
 749                 {0, 0},
 750                 {0, 0}
 751                 }
 752         },
 753         {0, 0, 2, 0,            /* 0x62 */
 754                 {{1, 1},
 755                 {5, 6},
 756                 {0, 0},
 757                 {0, 0}
 758                 }
 759         },
 760         {1, 0, 2, 0,            /* 0x63 */
 761                 {{0, 1},
 762                 {5, 6},
 763                 {0, 0},
 764                 {0, 0}
 765                 }
 766         },
 767         {0, 0, 2, 0,            /* 0x64 */
 768                 {{2, 2},
 769                 {5, 6},
 770                 {0, 0},
 771                 {0, 0}
 772                 }
 773         },
 774         {1, 0, 3, 0,            /* 0x65 */
 775                 {{0, 0},
 776                 {2, 2},
 777                 {5, 6},
 778                 {0, 0}
 779                 }
 780         },
 781         {0, 0, 2, 0,            /* 0x66 */
 782                 {{1, 2},
 783                 {5, 6},
 784                 {0, 0},
 785                 {0, 0}
 786                 }
 787         },
 788         {1, 0, 2, 0,            /* 0x67 */
 789                 {{0, 2},
 790                 {5, 6},
 791                 {0, 0},
 792                 {0, 0}
 793                 }
 794         },
 795         {0, 0, 2, 0,            /* 0x68 */
 796                 {{3, 3},
 797                 {5, 6},
 798                 {0, 0},
 799                 {0, 0}
 800                 }
 801         },
 802         {1, 0, 3, 0,            /* 0x69 */
 803                 {{0, 0},
 804                 {3, 3},
 805                 {5, 6},
 806                 {0, 0}
 807                 }
 808         },
 809         {0, 0, 3, 0,            /* 0x6a */
 810                 {{1, 1},
 811                 {3, 3},
 812                 {5, 6},
 813                 {0, 0}
 814                 }
 815         },
 816         {1, 0, 3, 0,            /* 0x6b */
 817                 {{0, 1},
 818                 {3, 3},
 819                 {5, 6},
 820                 {0, 0}
 821                 }
 822         },
 823         {0, 0, 2, 0,            /* 0x6c */
 824                 {{2, 3},
 825                 {5, 6},
 826                 {0, 0},
 827                 {0, 0}
 828                 }
 829         },
 830         {1, 0, 3, 0,            /* 0x6d */
 831                 {{0, 0},
 832                 {2, 3},
 833                 {5, 6},
 834                 {0, 0}
 835                 }
 836         },
 837         {0, 0, 2, 0,            /* 0x6e */
 838                 {{1, 3},
 839                 {5, 6},
 840                 {0, 0},
 841                 {0, 0}
 842                 }
 843         },
 844         {1, 0, 2, 0,            /* 0x6f */
 845                 {{0, 3},
 846                 {5, 6},
 847                 {0, 0},
 848                 {0, 0}
 849                 }
 850         },
 851         {0, 0, 1, 0,            /* 0x70 */
 852                 {{4, 6},
 853                 {0, 0},
 854                 {0, 0},
 855                 {0, 0}
 856                 }
 857         },
 858         {1, 0, 2, 0,            /* 0x71 */
 859                 {{0, 0},
 860                 {4, 6},
 861                 {0, 0},
 862                 {0, 0}
 863                 }
 864         },
 865         {0, 0, 2, 0,            /* 0x72 */
 866                 {{1, 1},
 867                 {4, 6},
 868                 {0, 0},
 869                 {0, 0}
 870                 }
 871         },
 872         {1, 0, 2, 0,            /* 0x73 */
 873                 {{0, 1},
 874                 {4, 6},
 875                 {0, 0},
 876                 {0, 0}
 877                 }
 878         },
 879         {0, 0, 2, 0,            /* 0x74 */
 880                 {{2, 2},
 881                 {4, 6},
 882                 {0, 0},
 883                 {0, 0}
 884                 }
 885         },
 886         {1, 0, 3, 0,            /* 0x75 */
 887                 {{0, 0},
 888                 {2, 2},
 889                 {4, 6},
 890                 {0, 0}
 891                 }
 892         },
 893         {0, 0, 2, 0,            /* 0x76 */
 894                 {{1, 2},
 895                 {4, 6},
 896                 {0, 0},
 897                 {0, 0}
 898                 }
 899         },
 900         {1, 0, 2, 0,            /* 0x77 */
 901                 {{0, 2},
 902                 {4, 6},
 903                 {0, 0},
 904                 {0, 0}
 905                 }
 906         },
 907         {0, 0, 1, 0,            /* 0x78 */
 908                 {{3, 6},
 909                 {0, 0},
 910                 {0, 0},
 911                 {0, 0}
 912                 }
 913         },
 914         {1, 0, 2, 0,            /* 0x79 */
 915                 {{0, 0},
 916                 {3, 6},
 917                 {0, 0},
 918                 {0, 0}
 919                 }
 920         },
 921         {0, 0, 2, 0,            /* 0x7a */
 922                 {{1, 1},
 923                 {3, 6},
 924                 {0, 0},
 925                 {0, 0}
 926                 }
 927         },
 928         {1, 0, 2, 0,            /* 0x7b */
 929                 {{0, 1},
 930                 {3, 6},
 931                 {0, 0},
 932                 {0, 0}
 933                 }
 934         },
 935         {0, 0, 1, 0,            /* 0x7c */
 936                 {{2, 6},
 937                 {0, 0},
 938                 {0, 0},
 939                 {0, 0}
 940                 }
 941         },
 942         {1, 0, 2, 0,            /* 0x7d */
 943                 {{0, 0},
 944                 {2, 6},
 945                 {0, 0},
 946                 {0, 0}
 947                 }
 948         },
 949         {0, 0, 1, 0,            /* 0x7e */
 950                 {{1, 6},
 951                 {0, 0},
 952                 {0, 0},
 953                 {0, 0}
 954                 }
 955         },
 956         {1, 0, 1, 0,            /* 0x7f */
 957                 {{0, 6},
 958                 {0, 0},
 959                 {0, 0},
 960                 {0, 0}
 961                 }
 962         },
 963         {0, 1, 1, 0,            /* 0x80 */
 964                 {{7, 7},
 965                 {0, 0},
 966                 {0, 0},
 967                 {0, 0}
 968                 }
 969         },
 970         {1, 1, 2, 0,            /* 0x81 */
 971                 {{0, 0},
 972                 {7, 7},
 973                 {0, 0},
 974                 {0, 0}
 975                 }
 976         },
 977         {0, 1, 2, 0,            /* 0x82 */
 978                 {{1, 1},
 979                 {7, 7},
 980                 {0, 0},
 981                 {0, 0}
 982                 }
 983         },
 984         {1, 1, 2, 0,            /* 0x83 */
 985                 {{0, 1},
 986                 {7, 7},
 987                 {0, 0},
 988                 {0, 0}
 989                 }
 990         },
 991         {0, 1, 2, 0,            /* 0x84 */
 992                 {{2, 2},
 993                 {7, 7},
 994                 {0, 0},
 995                 {0, 0}
 996                 }
 997         },
 998         {1, 1, 3, 0,            /* 0x85 */
 999                 {{0, 0},
1000                 {2, 2},
1001                 {7, 7},
1002                 {0, 0}
1003                 }
1004         },
1005         {0, 1, 2, 0,            /* 0x86 */
1006                 {{1, 2},
1007                 {7, 7},
1008                 {0, 0},
1009                 {0, 0}
1010                 }
1011         },
1012         {1, 1, 2, 0,            /* 0x87 */
1013                 {{0, 2},
1014                 {7, 7},
1015                 {0, 0},
1016                 {0, 0}
1017                 }
1018         },
1019         {0, 1, 2, 0,            /* 0x88 */
1020                 {{3, 3},
1021                 {7, 7},
1022                 {0, 0},
1023                 {0, 0}
1024                 }
1025         },
1026         {1, 1, 3, 0,            /* 0x89 */
1027                 {{0, 0},
1028                 {3, 3},
1029                 {7, 7},
1030                 {0, 0}
1031                 }
1032         },
1033         {0, 1, 3, 0,            /* 0x8a */
1034                 {{1, 1},
1035                 {3, 3},
1036                 {7, 7},
1037                 {0, 0}
1038                 }
1039         },
1040         {1, 1, 3, 0,            /* 0x8b */
1041                 {{0, 1},
1042                 {3, 3},
1043                 {7, 7},
1044                 {0, 0}
1045                 }
1046         },
1047         {0, 1, 2, 0,            /* 0x8c */
1048                 {{2, 3},
1049                 {7, 7},
1050                 {0, 0},
1051                 {0, 0}
1052                 }
1053         },
1054         {1, 1, 3, 0,            /* 0x8d */
1055                 {{0, 0},
1056                 {2, 3},
1057                 {7, 7},
1058                 {0, 0}
1059                 }
1060         },
1061         {0, 1, 2, 0,            /* 0x8e */
1062                 {{1, 3},
1063                 {7, 7},
1064                 {0, 0},
1065                 {0, 0}
1066                 }
1067         },
1068         {1, 1, 2, 0,            /* 0x8f */
1069                 {{0, 3},
1070                 {7, 7},
1071                 {0, 0},
1072                 {0, 0}
1073                 }
1074         },
1075         {0, 1, 2, 0,            /* 0x90 */
1076                 {{4, 4},
1077                 {7, 7},
1078                 {0, 0},
1079                 {0, 0}
1080                 }
1081         },
1082         {1, 1, 3, 0,            /* 0x91 */
1083                 {{0, 0},
1084                 {4, 4},
1085                 {7, 7},
1086                 {0, 0}
1087                 }
1088         },
1089         {0, 1, 3, 0,            /* 0x92 */
1090                 {{1, 1},
1091                 {4, 4},
1092                 {7, 7},
1093                 {0, 0}
1094                 }
1095         },
1096         {1, 1, 3, 0,            /* 0x93 */
1097                 {{0, 1},
1098                 {4, 4},
1099                 {7, 7},
1100                 {0, 0}
1101                 }
1102         },
1103         {0, 1, 3, 0,            /* 0x94 */
1104                 {{2, 2},
1105                 {4, 4},
1106                 {7, 7},
1107                 {0, 0}
1108                 }
1109         },
1110         {1, 1, 4, 0,            /* 0x95 */
1111                 {{0, 0},
1112                 {2, 2},
1113                 {4, 4},
1114                 {7, 7}
1115                 }
1116         },
1117         {0, 1, 3, 0,            /* 0x96 */
1118                 {{1, 2},
1119                 {4, 4},
1120                 {7, 7},
1121                 {0, 0}
1122                 }
1123         },
1124         {1, 1, 3, 0,            /* 0x97 */
1125                 {{0, 2},
1126                 {4, 4},
1127                 {7, 7},
1128                 {0, 0}
1129                 }
1130         },
1131         {0, 1, 2, 0,            /* 0x98 */
1132                 {{3, 4},
1133                 {7, 7},
1134                 {0, 0},
1135                 {0, 0}
1136                 }
1137         },
1138         {1, 1, 3, 0,            /* 0x99 */
1139                 {{0, 0},
1140                 {3, 4},
1141                 {7, 7},
1142                 {0, 0}
1143                 }
1144         },
1145         {0, 1, 3, 0,            /* 0x9a */
1146                 {{1, 1},
1147                 {3, 4},
1148                 {7, 7},
1149                 {0, 0}
1150                 }
1151         },
1152         {1, 1, 3, 0,            /* 0x9b */
1153                 {{0, 1},
1154                 {3, 4},
1155                 {7, 7},
1156                 {0, 0}
1157                 }
1158         },
1159         {0, 1, 2, 0,            /* 0x9c */
1160                 {{2, 4},
1161                 {7, 7},
1162                 {0, 0},
1163                 {0, 0}
1164                 }
1165         },
1166         {1, 1, 3, 0,            /* 0x9d */
1167                 {{0, 0},
1168                 {2, 4},
1169                 {7, 7},
1170                 {0, 0}
1171                 }
1172         },
1173         {0, 1, 2, 0,            /* 0x9e */
1174                 {{1, 4},
1175                 {7, 7},
1176                 {0, 0},
1177                 {0, 0}
1178                 }
1179         },
1180         {1, 1, 2, 0,            /* 0x9f */
1181                 {{0, 4},
1182                 {7, 7},
1183                 {0, 0},
1184                 {0, 0}
1185                 }
1186         },
1187         {0, 1, 2, 0,            /* 0xa0 */
1188                 {{5, 5},
1189                 {7, 7},
1190                 {0, 0},
1191                 {0, 0}
1192                 }
1193         },
1194         {1, 1, 3, 0,            /* 0xa1 */
1195                 {{0, 0},
1196                 {5, 5},
1197                 {7, 7},
1198                 {0, 0}
1199                 }
1200         },
1201         {0, 1, 3, 0,            /* 0xa2 */
1202                 {{1, 1},
1203                 {5, 5},
1204                 {7, 7},
1205                 {0, 0}
1206                 }
1207         },
1208         {1, 1, 3, 0,            /* 0xa3 */
1209                 {{0, 1},
1210                 {5, 5},
1211                 {7, 7},
1212                 {0, 0}
1213                 }
1214         },
1215         {0, 1, 3, 0,            /* 0xa4 */
1216                 {{2, 2},
1217                 {5, 5},
1218                 {7, 7},
1219                 {0, 0}
1220                 }
1221         },
1222         {1, 1, 4, 0,            /* 0xa5 */
1223                 {{0, 0},
1224                 {2, 2},
1225                 {5, 5},
1226                 {7, 7}
1227                 }
1228         },
1229         {0, 1, 3, 0,            /* 0xa6 */
1230                 {{1, 2},
1231                 {5, 5},
1232                 {7, 7},
1233                 {0, 0}
1234                 }
1235         },
1236         {1, 1, 3, 0,            /* 0xa7 */
1237                 {{0, 2},
1238                 {5, 5},
1239                 {7, 7},
1240                 {0, 0}
1241                 }
1242         },
1243         {0, 1, 3, 0,            /* 0xa8 */
1244                 {{3, 3},
1245                 {5, 5},
1246                 {7, 7},
1247                 {0, 0}
1248                 }
1249         },
1250         {1, 1, 4, 0,            /* 0xa9 */
1251                 {{0, 0},
1252                 {3, 3},
1253                 {5, 5},
1254                 {7, 7}
1255                 }
1256         },
1257         {0, 1, 4, 0,            /* 0xaa */
1258                 {{1, 1},
1259                 {3, 3},
1260                 {5, 5},
1261                 {7, 7}
1262                 }
1263         },
1264         {1, 1, 4, 0,            /* 0xab */
1265                 {{0, 1},
1266                 {3, 3},
1267                 {5, 5},
1268                 {7, 7}
1269                 }
1270         },
1271         {0, 1, 3, 0,            /* 0xac */
1272                 {{2, 3},
1273                 {5, 5},
1274                 {7, 7},
1275                 {0, 0}
1276                 }
1277         },
1278         {1, 1, 4, 0,            /* 0xad */
1279                 {{0, 0},
1280                 {2, 3},
1281                 {5, 5},
1282                 {7, 7}
1283                 }
1284         },
1285         {0, 1, 3, 0,            /* 0xae */
1286                 {{1, 3},
1287                 {5, 5},
1288                 {7, 7},
1289                 {0, 0}
1290                 }
1291         },
1292         {1, 1, 3, 0,            /* 0xaf */
1293                 {{0, 3},
1294                 {5, 5},
1295                 {7, 7},
1296                 {0, 0}
1297                 }
1298         },
1299         {0, 1, 2, 0,            /* 0xb0 */
1300                 {{4, 5},
1301                 {7, 7},
1302                 {0, 0},
1303                 {0, 0}
1304                 }
1305         },
1306         {1, 1, 3, 0,            /* 0xb1 */
1307                 {{0, 0},
1308                 {4, 5},
1309                 {7, 7},
1310                 {0, 0}
1311                 }
1312         },
1313         {0, 1, 3, 0,            /* 0xb2 */
1314                 {{1, 1},
1315                 {4, 5},
1316                 {7, 7},
1317                 {0, 0}
1318                 }
1319         },
1320         {1, 1, 3, 0,            /* 0xb3 */
1321                 {{0, 1},
1322                 {4, 5},
1323                 {7, 7},
1324                 {0, 0}
1325                 }
1326         },
1327         {0, 1, 3, 0,            /* 0xb4 */
1328                 {{2, 2},
1329                 {4, 5},
1330                 {7, 7},
1331                 {0, 0}
1332                 }
1333         },
1334         {1, 1, 4, 0,            /* 0xb5 */
1335                 {{0, 0},
1336                 {2, 2},
1337                 {4, 5},
1338                 {7, 7}
1339                 }
1340         },
1341         {0, 1, 3, 0,            /* 0xb6 */
1342                 {{1, 2},
1343                 {4, 5},
1344                 {7, 7},
1345                 {0, 0}
1346                 }
1347         },
1348         {1, 1, 3, 0,            /* 0xb7 */
1349                 {{0, 2},
1350                 {4, 5},
1351                 {7, 7},
1352                 {0, 0}
1353                 }
1354         },
1355         {0, 1, 2, 0,            /* 0xb8 */
1356                 {{3, 5},
1357                 {7, 7},
1358                 {0, 0},
1359                 {0, 0}
1360                 }
1361         },
1362         {1, 1, 3, 0,            /* 0xb9 */
1363                 {{0, 0},
1364                 {3, 5},
1365                 {7, 7},
1366                 {0, 0}
1367                 }
1368         },
1369         {0, 1, 3, 0,            /* 0xba */
1370                 {{1, 1},
1371                 {3, 5},
1372                 {7, 7},
1373                 {0, 0}
1374                 }
1375         },
1376         {1, 1, 3, 0,            /* 0xbb */
1377                 {{0, 1},
1378                 {3, 5},
1379                 {7, 7},
1380                 {0, 0}
1381                 }
1382         },
1383         {0, 1, 2, 0,            /* 0xbc */
1384                 {{2, 5},
1385                 {7, 7},
1386                 {0, 0},
1387                 {0, 0}
1388                 }
1389         },
1390         {1, 1, 3, 0,            /* 0xbd */
1391                 {{0, 0},
1392                 {2, 5},
1393                 {7, 7},
1394                 {0, 0}
1395                 }
1396         },
1397         {0, 1, 2, 0,            /* 0xbe */
1398                 {{1, 5},
1399                 {7, 7},
1400                 {0, 0},
1401                 {0, 0}
1402                 }
1403         },
1404         {1, 1, 2, 0,            /* 0xbf */
1405                 {{0, 5},
1406                 {7, 7},
1407                 {0, 0},
1408                 {0, 0}
1409                 }
1410         },
1411         {0, 1, 1, 0,            /* 0xc0 */
1412                 {{6, 7},
1413                 {0, 0},
1414                 {0, 0},
1415                 {0, 0}
1416                 }
1417         },
1418         {1, 1, 2, 0,            /* 0xc1 */
1419                 {{0, 0},
1420                 {6, 7},
1421                 {0, 0},
1422                 {0, 0}
1423                 }
1424         },
1425         {0, 1, 2, 0,            /* 0xc2 */
1426                 {{1, 1},
1427                 {6, 7},
1428                 {0, 0},
1429                 {0, 0}
1430                 }
1431         },
1432         {1, 1, 2, 0,            /* 0xc3 */
1433                 {{0, 1},
1434                 {6, 7},
1435                 {0, 0},
1436                 {0, 0}
1437                 }
1438         },
1439         {0, 1, 2, 0,            /* 0xc4 */
1440                 {{2, 2},
1441                 {6, 7},
1442                 {0, 0},
1443                 {0, 0}
1444                 }
1445         },
1446         {1, 1, 3, 0,            /* 0xc5 */
1447                 {{0, 0},
1448                 {2, 2},
1449                 {6, 7},
1450                 {0, 0}
1451                 }
1452         },
1453         {0, 1, 2, 0,            /* 0xc6 */
1454                 {{1, 2},
1455                 {6, 7},
1456                 {0, 0},
1457                 {0, 0}
1458                 }
1459         },
1460         {1, 1, 2, 0,            /* 0xc7 */
1461                 {{0, 2},
1462                 {6, 7},
1463                 {0, 0},
1464                 {0, 0}
1465                 }
1466         },
1467         {0, 1, 2, 0,            /* 0xc8 */
1468                 {{3, 3},
1469                 {6, 7},
1470                 {0, 0},
1471                 {0, 0}
1472                 }
1473         },
1474         {1, 1, 3, 0,            /* 0xc9 */
1475                 {{0, 0},
1476                 {3, 3},
1477                 {6, 7},
1478                 {0, 0}
1479                 }
1480         },
1481         {0, 1, 3, 0,            /* 0xca */
1482                 {{1, 1},
1483                 {3, 3},
1484                 {6, 7},
1485                 {0, 0}
1486                 }
1487         },
1488         {1, 1, 3, 0,            /* 0xcb */
1489                 {{0, 1},
1490                 {3, 3},
1491                 {6, 7},
1492                 {0, 0}
1493                 }
1494         },
1495         {0, 1, 2, 0,            /* 0xcc */
1496                 {{2, 3},
1497                 {6, 7},
1498                 {0, 0},
1499                 {0, 0}
1500                 }
1501         },
1502         {1, 1, 3, 0,            /* 0xcd */
1503                 {{0, 0},
1504                 {2, 3},
1505                 {6, 7},
1506                 {0, 0}
1507                 }
1508         },
1509         {0, 1, 2, 0,            /* 0xce */
1510                 {{1, 3},
1511                 {6, 7},
1512                 {0, 0},
1513                 {0, 0}
1514                 }
1515         },
1516         {1, 1, 2, 0,            /* 0xcf */
1517                 {{0, 3},
1518                 {6, 7},
1519                 {0, 0},
1520                 {0, 0}
1521                 }
1522         },
1523         {0, 1, 2, 0,            /* 0xd0 */
1524                 {{4, 4},
1525                 {6, 7},
1526                 {0, 0},
1527                 {0, 0}
1528                 }
1529         },
1530         {1, 1, 3, 0,            /* 0xd1 */
1531                 {{0, 0},
1532                 {4, 4},
1533                 {6, 7},
1534                 {0, 0}
1535                 }
1536         },
1537         {0, 1, 3, 0,            /* 0xd2 */
1538                 {{1, 1},
1539                 {4, 4},
1540                 {6, 7},
1541                 {0, 0}
1542                 }
1543         },
1544         {1, 1, 3, 0,            /* 0xd3 */
1545                 {{0, 1},
1546                 {4, 4},
1547                 {6, 7},
1548                 {0, 0}
1549                 }
1550         },
1551         {0, 1, 3, 0,            /* 0xd4 */
1552                 {{2, 2},
1553                 {4, 4},
1554                 {6, 7},
1555                 {0, 0}
1556                 }
1557         },
1558         {1, 1, 4, 0,            /* 0xd5 */
1559                 {{0, 0},
1560                 {2, 2},
1561                 {4, 4},
1562                 {6, 7}
1563                 }
1564         },
1565         {0, 1, 3, 0,            /* 0xd6 */
1566                 {{1, 2},
1567                 {4, 4},
1568                 {6, 7},
1569                 {0, 0}
1570                 }
1571         },
1572         {1, 1, 3, 0,            /* 0xd7 */
1573                 {{0, 2},
1574                 {4, 4},
1575                 {6, 7},
1576                 {0, 0}
1577                 }
1578         },
1579         {0, 1, 2, 0,            /* 0xd8 */
1580                 {{3, 4},
1581                 {6, 7},
1582                 {0, 0},
1583                 {0, 0}
1584                 }
1585         },
1586         {1, 1, 3, 0,            /* 0xd9 */
1587                 {{0, 0},
1588                 {3, 4},
1589                 {6, 7},
1590                 {0, 0}
1591                 }
1592         },
1593         {0, 1, 3, 0,            /* 0xda */
1594                 {{1, 1},
1595                 {3, 4},
1596                 {6, 7},
1597                 {0, 0}
1598                 }
1599         },
1600         {1, 1, 3, 0,            /* 0xdb */
1601                 {{0, 1},
1602                 {3, 4},
1603                 {6, 7},
1604                 {0, 0}
1605                 }
1606         },
1607         {0, 1, 2, 0,            /* 0xdc */
1608                 {{2, 4},
1609                 {6, 7},
1610                 {0, 0},
1611                 {0, 0}
1612                 }
1613         },
1614         {1, 1, 3, 0,            /* 0xdd */
1615                 {{0, 0},
1616                 {2, 4},
1617                 {6, 7},
1618                 {0, 0}
1619                 }
1620         },
1621         {0, 1, 2, 0,            /* 0xde */
1622                 {{1, 4},
1623                 {6, 7},
1624                 {0, 0},
1625                 {0, 0}
1626                 }
1627         },
1628         {1, 1, 2, 0,            /* 0xdf */
1629                 {{0, 4},
1630                 {6, 7},
1631                 {0, 0},
1632                 {0, 0}
1633                 }
1634         },
1635         {0, 1, 1, 0,            /* 0xe0 */
1636                 {{5, 7},
1637                 {0, 0},
1638                 {0, 0},
1639                 {0, 0}
1640                 }
1641         },
1642         {1, 1, 2, 0,            /* 0xe1 */
1643                 {{0, 0},
1644                 {5, 7},
1645                 {0, 0},
1646                 {0, 0}
1647                 }
1648         },
1649         {0, 1, 2, 0,            /* 0xe2 */
1650                 {{1, 1},
1651                 {5, 7},
1652                 {0, 0},
1653                 {0, 0}
1654                 }
1655         },
1656         {1, 1, 2, 0,            /* 0xe3 */
1657                 {{0, 1},
1658                 {5, 7},
1659                 {0, 0},
1660                 {0, 0}
1661                 }
1662         },
1663         {0, 1, 2, 0,            /* 0xe4 */
1664                 {{2, 2},
1665                 {5, 7},
1666                 {0, 0},
1667                 {0, 0}
1668                 }
1669         },
1670         {1, 1, 3, 0,            /* 0xe5 */
1671                 {{0, 0},
1672                 {2, 2},
1673                 {5, 7},
1674                 {0, 0}
1675                 }
1676         },
1677         {0, 1, 2, 0,            /* 0xe6 */
1678                 {{1, 2},
1679                 {5, 7},
1680                 {0, 0},
1681                 {0, 0}
1682                 }
1683         },
1684         {1, 1, 2, 0,            /* 0xe7 */
1685                 {{0, 2},
1686                 {5, 7},
1687                 {0, 0},
1688                 {0, 0}
1689                 }
1690         },
1691         {0, 1, 2, 0,            /* 0xe8 */
1692                 {{3, 3},
1693                 {5, 7},
1694                 {0, 0},
1695                 {0, 0}
1696                 }
1697         },
1698         {1, 1, 3, 0,            /* 0xe9 */
1699                 {{0, 0},
1700                 {3, 3},
1701                 {5, 7},
1702                 {0, 0}
1703                 }
1704         },
1705         {0, 1, 3, 0,            /* 0xea */
1706                 {{1, 1},
1707                 {3, 3},
1708                 {5, 7},
1709                 {0, 0}
1710                 }
1711         },
1712         {1, 1, 3, 0,            /* 0xeb */
1713                 {{0, 1},
1714                 {3, 3},
1715                 {5, 7},
1716                 {0, 0}
1717                 }
1718         },
1719         {0, 1, 2, 0,            /* 0xec */
1720                 {{2, 3},
1721                 {5, 7},
1722                 {0, 0},
1723                 {0, 0}
1724                 }
1725         },
1726         {1, 1, 3, 0,            /* 0xed */
1727                 {{0, 0},
1728                 {2, 3},
1729                 {5, 7},
1730                 {0, 0}
1731                 }
1732         },
1733         {0, 1, 2, 0,            /* 0xee */
1734                 {{1, 3},
1735                 {5, 7},
1736                 {0, 0},
1737                 {0, 0}
1738                 }
1739         },
1740         {1, 1, 2, 0,            /* 0xef */
1741                 {{0, 3},
1742                 {5, 7},
1743                 {0, 0},
1744                 {0, 0}
1745                 }
1746         },
1747         {0, 1, 1, 0,            /* 0xf0 */
1748                 {{4, 7},
1749                 {0, 0},
1750                 {0, 0},
1751                 {0, 0}
1752                 }
1753         },
1754         {1, 1, 2, 0,            /* 0xf1 */
1755                 {{0, 0},
1756                 {4, 7},
1757                 {0, 0},
1758                 {0, 0}
1759                 }
1760         },
1761         {0, 1, 2, 0,            /* 0xf2 */
1762                 {{1, 1},
1763                 {4, 7},
1764                 {0, 0},
1765                 {0, 0}
1766                 }
1767         },
1768         {1, 1, 2, 0,            /* 0xf3 */
1769                 {{0, 1},
1770                 {4, 7},
1771                 {0, 0},
1772                 {0, 0}
1773                 }
1774         },
1775         {0, 1, 2, 0,            /* 0xf4 */
1776                 {{2, 2},
1777                 {4, 7},
1778                 {0, 0},
1779                 {0, 0}
1780                 }
1781         },
1782         {1, 1, 3, 0,            /* 0xf5 */
1783                 {{0, 0},
1784                 {2, 2},
1785                 {4, 7},
1786                 {0, 0}
1787                 }
1788         },
1789         {0, 1, 2, 0,            /* 0xf6 */
1790                 {{1, 2},
1791                 {4, 7},
1792                 {0, 0},
1793                 {0, 0}
1794                 }
1795         },
1796         {1, 1, 2, 0,            /* 0xf7 */
1797                 {{0, 2},
1798                 {4, 7},
1799                 {0, 0},
1800                 {0, 0}
1801                 }
1802         },
1803         {0, 1, 1, 0,            /* 0xf8 */
1804                 {{3, 7},
1805                 {0, 0},
1806                 {0, 0},
1807                 {0, 0}
1808                 }
1809         },
1810         {1, 1, 2, 0,            /* 0xf9 */
1811                 {{0, 0},
1812                 {3, 7},
1813                 {0, 0},
1814                 {0, 0}
1815                 }
1816         },
1817         {0, 1, 2, 0,            /* 0xfa */
1818                 {{1, 1},
1819                 {3, 7},
1820                 {0, 0},
1821                 {0, 0}
1822                 }
1823         },
1824         {1, 1, 2, 0,            /* 0xfb */
1825                 {{0, 1},
1826                 {3, 7},
1827                 {0, 0},
1828                 {0, 0}
1829                 }
1830         },
1831         {0, 1, 1, 0,            /* 0xfc */
1832                 {{2, 7},
1833                 {0, 0},
1834                 {0, 0},
1835                 {0, 0}
1836                 }
1837         },
1838         {1, 1, 2, 0,            /* 0xfd */
1839                 {{0, 0},
1840                 {2, 7},
1841                 {0, 0},
1842                 {0, 0}
1843                 }
1844         },
1845         {0, 1, 1, 0,            /* 0xfe */
1846                 {{1, 7},
1847                 {0, 0},
1848                 {0, 0},
1849                 {0, 0}
1850                 }
1851         },
1852         {1, 1, 1, 0,            /* 0xff */
1853                 {{0, 7},
1854                 {0, 0},
1855                 {0, 0},
1856                 {0, 0}
1857                 }
1858         }
1859 };
1860
1861
1862 int
1863 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1864     int ipv4_addr_legal,
1865     int ipv6_addr_legal,
1866     int loopback_scope,
1867     int ipv4_local_scope,
1868     int local_scope,
1869     int site_scope,
1870     int do_update)
1871 {
1872         if ((loopback_scope == 0) &&
1873             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1874                 /*
1875                  * skip loopback if not in scope *
1876                  */
1877                 return (0);
1878         }
1879         switch (ifa->address.sa.sa_family) {
1880         case AF_INET:
1881                 if (ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = (struct sockaddr_in *)&ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #ifdef INET6
1899         case AF_INET6:
1900                 if (ipv6_addr_legal) {
1901                         struct sockaddr_in6 *sin6;
1902
1903                         /*
1904                          * Must update the flags,  bummer, which means any
1905                          * IFA locks must now be applied HERE <->
1906                          */
1907                         if (do_update) {
1908                                 sctp_gather_internal_ifa_flags(ifa);
1909                         }
1910                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1911                                 return (0);
1912                         }
1913                         /* ok to use deprecated addresses? */
1914                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1915                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1916                                 /* skip unspecifed addresses */
1917                                 return (0);
1918                         }
1919                         if (    /* (local_scope == 0) && */
1920                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1921                                 return (0);
1922                         }
1923                         if ((site_scope == 0) &&
1924                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                 } else {
1928                         return (0);
1929                 }
1930                 break;
1931 #endif
1932         default:
1933                 return (0);
1934         }
1935         return (1);
1936 }
1937
1938 static struct mbuf *
1939 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1940 {
1941         struct sctp_paramhdr *parmh;
1942         struct mbuf *mret;
1943         int len;
1944
1945         if (ifa->address.sa.sa_family == AF_INET) {
1946                 len = sizeof(struct sctp_ipv4addr_param);
1947         } else if (ifa->address.sa.sa_family == AF_INET6) {
1948                 len = sizeof(struct sctp_ipv6addr_param);
1949         } else {
1950                 /* unknown type */
1951                 return (m);
1952         }
1953         if (M_TRAILINGSPACE(m) >= len) {
1954                 /* easy side we just drop it on the end */
1955                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1956                 mret = m;
1957         } else {
1958                 /* Need more space */
1959                 mret = m;
1960                 while (SCTP_BUF_NEXT(mret) != NULL) {
1961                         mret = SCTP_BUF_NEXT(mret);
1962                 }
1963                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1964                 if (SCTP_BUF_NEXT(mret) == NULL) {
1965                         /* We are hosed, can't add more addresses */
1966                         return (m);
1967                 }
1968                 mret = SCTP_BUF_NEXT(mret);
1969                 parmh = mtod(mret, struct sctp_paramhdr *);
1970         }
1971         /* now add the parameter */
1972         switch (ifa->address.sa.sa_family) {
1973         case AF_INET:
1974                 {
1975                         struct sctp_ipv4addr_param *ipv4p;
1976                         struct sockaddr_in *sin;
1977
1978                         sin = (struct sockaddr_in *)&ifa->address.sin;
1979                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1980                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1981                         parmh->param_length = htons(len);
1982                         ipv4p->addr = sin->sin_addr.s_addr;
1983                         SCTP_BUF_LEN(mret) += len;
1984                         break;
1985                 }
1986 #ifdef INET6
1987         case AF_INET6:
1988                 {
1989                         struct sctp_ipv6addr_param *ipv6p;
1990                         struct sockaddr_in6 *sin6;
1991
1992                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1993                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
1994                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
1995                         parmh->param_length = htons(len);
1996                         memcpy(ipv6p->addr, &sin6->sin6_addr,
1997                             sizeof(ipv6p->addr));
1998                         /* clear embedded scope in the address */
1999                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2000                         SCTP_BUF_LEN(mret) += len;
2001                         break;
2002                 }
2003 #endif
2004         default:
2005                 return (m);
2006         }
2007         return (mret);
2008 }
2009
2010
2011 struct mbuf *
2012 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
2013     struct mbuf *m_at, int cnt_inits_to)
2014 {
2015         struct sctp_vrf *vrf = NULL;
2016         int cnt, limit_out = 0, total_count;
2017         uint32_t vrf_id;
2018
2019         vrf_id = inp->def_vrf_id;
2020         SCTP_IPI_ADDR_RLOCK();
2021         vrf = sctp_find_vrf(vrf_id);
2022         if (vrf == NULL) {
2023                 SCTP_IPI_ADDR_RUNLOCK();
2024                 return (m_at);
2025         }
2026         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2027                 struct sctp_ifa *sctp_ifap;
2028                 struct sctp_ifn *sctp_ifnp;
2029
2030                 cnt = cnt_inits_to;
2031                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2032                         limit_out = 1;
2033                         cnt = SCTP_ADDRESS_LIMIT;
2034                         goto skip_count;
2035                 }
2036                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2037                         if ((scope->loopback_scope == 0) &&
2038                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2039                                 /*
2040                                  * Skip loopback devices if loopback_scope
2041                                  * not set
2042                                  */
2043                                 continue;
2044                         }
2045                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2046                                 if (sctp_is_address_in_scope(sctp_ifap,
2047                                     scope->ipv4_addr_legal,
2048                                     scope->ipv6_addr_legal,
2049                                     scope->loopback_scope,
2050                                     scope->ipv4_local_scope,
2051                                     scope->local_scope,
2052                                     scope->site_scope, 1) == 0) {
2053                                         continue;
2054                                 }
2055                                 cnt++;
2056                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2057                                         break;
2058                                 }
2059                         }
2060                         if (cnt > SCTP_ADDRESS_LIMIT) {
2061                                 break;
2062                         }
2063                 }
2064 skip_count:
2065                 if (cnt > 1) {
2066                         total_count = 0;
2067                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2068                                 cnt = 0;
2069                                 if ((scope->loopback_scope == 0) &&
2070                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2071                                         /*
2072                                          * Skip loopback devices if
2073                                          * loopback_scope not set
2074                                          */
2075                                         continue;
2076                                 }
2077                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2078                                         if (sctp_is_address_in_scope(sctp_ifap,
2079                                             scope->ipv4_addr_legal,
2080                                             scope->ipv6_addr_legal,
2081                                             scope->loopback_scope,
2082                                             scope->ipv4_local_scope,
2083                                             scope->local_scope,
2084                                             scope->site_scope, 0) == 0) {
2085                                                 continue;
2086                                         }
2087                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2088                                         if (limit_out) {
2089                                                 cnt++;
2090                                                 total_count++;
2091                                                 if (cnt >= 2) {
2092                                                         /*
2093                                                          * two from each
2094                                                          * address
2095                                                          */
2096                                                         break;
2097                                                 }
2098                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2099                                                         /* No more addresses */
2100                                                         break;
2101                                                 }
2102                                         }
2103                                 }
2104                         }
2105                 }
2106         } else {
2107                 struct sctp_laddr *laddr;
2108
2109                 cnt = cnt_inits_to;
2110                 /* First, how many ? */
2111                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2112                         if (laddr->ifa == NULL) {
2113                                 continue;
2114                         }
2115                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2116                                 /*
2117                                  * Address being deleted by the system, dont
2118                                  * list.
2119                                  */
2120                                 continue;
2121                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2122                                 /*
2123                                  * Address being deleted on this ep don't
2124                                  * list.
2125                                  */
2126                                 continue;
2127                         }
2128                         if (sctp_is_address_in_scope(laddr->ifa,
2129                             scope->ipv4_addr_legal,
2130                             scope->ipv6_addr_legal,
2131                             scope->loopback_scope,
2132                             scope->ipv4_local_scope,
2133                             scope->local_scope,
2134                             scope->site_scope, 1) == 0) {
2135                                 continue;
2136                         }
2137                         cnt++;
2138                 }
2139                 if (cnt > SCTP_ADDRESS_LIMIT) {
2140                         limit_out = 1;
2141                 }
2142                 /*
2143                  * To get through a NAT we only list addresses if we have
2144                  * more than one. That way if you just bind a single address
2145                  * we let the source of the init dictate our address.
2146                  */
2147                 if (cnt > 1) {
2148                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2149                                 cnt = 0;
2150                                 if (laddr->ifa == NULL) {
2151                                         continue;
2152                                 }
2153                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2154                                         continue;
2155
2156                                 if (sctp_is_address_in_scope(laddr->ifa,
2157                                     scope->ipv4_addr_legal,
2158                                     scope->ipv6_addr_legal,
2159                                     scope->loopback_scope,
2160                                     scope->ipv4_local_scope,
2161                                     scope->local_scope,
2162                                     scope->site_scope, 0) == 0) {
2163                                         continue;
2164                                 }
2165                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2166                                 cnt++;
2167                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2168                                         break;
2169                                 }
2170                         }
2171                 }
2172         }
2173         SCTP_IPI_ADDR_RUNLOCK();
2174         return (m_at);
2175 }
2176
2177 static struct sctp_ifa *
2178 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2179     uint8_t dest_is_loop,
2180     uint8_t dest_is_priv,
2181     sa_family_t fam)
2182 {
2183         uint8_t dest_is_global = 0;
2184
2185         /* dest_is_priv is true if destination is a private address */
2186         /* dest_is_loop is true if destination is a loopback addresses */
2187
2188         /*
2189          * Here we determine if its a preferred address. A preferred address
2190          * means it is the same scope or higher scope then the destination.
2191          * L = loopback, P = private, G = global
2192          * ----------------------------------------- src    |  dest | result
2193          * ---------------------------------------- L     |    L  |    yes
2194          * ----------------------------------------- P     |    L  |
2195          * yes-v4 no-v6 ----------------------------------------- G     |
2196          * L  |    yes-v4 no-v6 ----------------------------------------- L
2197          * |    P  |    no ----------------------------------------- P     |
2198          * P  |    yes ----------------------------------------- G     |
2199          * P  |    no ----------------------------------------- L     |    G
2200          * |    no ----------------------------------------- P     |    G  |
2201          * no ----------------------------------------- G     |    G  |
2202          * yes -----------------------------------------
2203          */
2204
2205         if (ifa->address.sa.sa_family != fam) {
2206                 /* forget mis-matched family */
2207                 return (NULL);
2208         }
2209         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2210                 dest_is_global = 1;
2211         }
2212         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2213         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2214         /* Ok the address may be ok */
2215         if (fam == AF_INET6) {
2216                 /* ok to use deprecated addresses? no lets not! */
2217                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2218                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2219                         return (NULL);
2220                 }
2221                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2222                         if (dest_is_loop) {
2223                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2224                                 return (NULL);
2225                         }
2226                 }
2227                 if (ifa->src_is_glob) {
2228                         if (dest_is_loop) {
2229                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2230                                 return (NULL);
2231                         }
2232                 }
2233         }
2234         /*
2235          * Now that we know what is what, implement or table this could in
2236          * theory be done slicker (it used to be), but this is
2237          * straightforward and easier to validate :-)
2238          */
2239         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2240             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2241         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2242             dest_is_loop, dest_is_priv, dest_is_global);
2243
2244         if ((ifa->src_is_loop) && (dest_is_priv)) {
2245                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2246                 return (NULL);
2247         }
2248         if ((ifa->src_is_glob) && (dest_is_priv)) {
2249                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2250                 return (NULL);
2251         }
2252         if ((ifa->src_is_loop) && (dest_is_global)) {
2253                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2254                 return (NULL);
2255         }
2256         if ((ifa->src_is_priv) && (dest_is_global)) {
2257                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2258                 return (NULL);
2259         }
2260         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2261         /* its a preferred address */
2262         return (ifa);
2263 }
2264
2265 static struct sctp_ifa *
2266 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2267     uint8_t dest_is_loop,
2268     uint8_t dest_is_priv,
2269     sa_family_t fam)
2270 {
2271         uint8_t dest_is_global = 0;
2272
2273
2274         /*
2275          * Here we determine if its a acceptable address. A acceptable
2276          * address means it is the same scope or higher scope but we can
2277          * allow for NAT which means its ok to have a global dest and a
2278          * private src.
2279          *
2280          * L = loopback, P = private, G = global
2281          * ----------------------------------------- src    |  dest | result
2282          * ----------------------------------------- L     |   L   |    yes
2283          * ----------------------------------------- P     |   L   |
2284          * yes-v4 no-v6 ----------------------------------------- G     |
2285          * L   |    yes ----------------------------------------- L     |
2286          * P   |    no ----------------------------------------- P     |   P
2287          * |    yes ----------------------------------------- G     |   P
2288          * |    yes - May not work -----------------------------------------
2289          * L     |   G   |    no ----------------------------------------- P
2290          * |   G   |    yes - May not work
2291          * ----------------------------------------- G     |   G   |    yes
2292          * -----------------------------------------
2293          */
2294
2295         if (ifa->address.sa.sa_family != fam) {
2296                 /* forget non matching family */
2297                 return (NULL);
2298         }
2299         /* Ok the address may be ok */
2300         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2301                 dest_is_global = 1;
2302         }
2303         if (fam == AF_INET6) {
2304                 /* ok to use deprecated addresses? */
2305                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2306                         return (NULL);
2307                 }
2308                 if (ifa->src_is_priv) {
2309                         /* Special case, linklocal to loop */
2310                         if (dest_is_loop)
2311                                 return (NULL);
2312                 }
2313         }
2314         /*
2315          * Now that we know what is what, implement our table. This could in
2316          * theory be done slicker (it used to be), but this is
2317          * straightforward and easier to validate :-)
2318          */
2319         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2320                 return (NULL);
2321         }
2322         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2323                 return (NULL);
2324         }
2325         /* its an acceptable address */
2326         return (ifa);
2327 }
2328
2329 int
2330 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2331 {
2332         struct sctp_laddr *laddr;
2333
2334         if (stcb == NULL) {
2335                 /* There are no restrictions, no TCB :-) */
2336                 return (0);
2337         }
2338         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2339                 if (laddr->ifa == NULL) {
2340                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2341                             __FUNCTION__);
2342                         continue;
2343                 }
2344                 if (laddr->ifa == ifa) {
2345                         /* Yes it is on the list */
2346                         return (1);
2347                 }
2348         }
2349         return (0);
2350 }
2351
2352
2353 int
2354 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2355 {
2356         struct sctp_laddr *laddr;
2357
2358         if (ifa == NULL)
2359                 return (0);
2360         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2361                 if (laddr->ifa == NULL) {
2362                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2363                             __FUNCTION__);
2364                         continue;
2365                 }
2366                 if ((laddr->ifa == ifa) && laddr->action == 0)
2367                         /* same pointer */
2368                         return (1);
2369         }
2370         return (0);
2371 }
2372
2373
2374
2375 static struct sctp_ifa *
2376 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2377     sctp_route_t * ro,
2378     uint32_t vrf_id,
2379     int non_asoc_addr_ok,
2380     uint8_t dest_is_priv,
2381     uint8_t dest_is_loop,
2382     sa_family_t fam)
2383 {
2384         struct sctp_laddr *laddr, *starting_point;
2385         void *ifn;
2386         int resettotop = 0;
2387         struct sctp_ifn *sctp_ifn;
2388         struct sctp_ifa *sctp_ifa, *sifa;
2389         struct sctp_vrf *vrf;
2390         uint32_t ifn_index;
2391
2392         vrf = sctp_find_vrf(vrf_id);
2393         if (vrf == NULL)
2394                 return (NULL);
2395
2396         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2397         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2398         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2399         /*
2400          * first question, is the ifn we will emit on in our list, if so, we
2401          * want such an address. Note that we first looked for a preferred
2402          * address.
2403          */
2404         if (sctp_ifn) {
2405                 /* is a preferred one on the interface we route out? */
2406                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2407                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2408                             (non_asoc_addr_ok == 0))
2409                                 continue;
2410                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2411                             dest_is_loop,
2412                             dest_is_priv, fam);
2413                         if (sifa == NULL)
2414                                 continue;
2415                         if (sctp_is_addr_in_ep(inp, sifa)) {
2416                                 atomic_add_int(&sifa->refcount, 1);
2417                                 return (sifa);
2418                         }
2419                 }
2420         }
2421         /*
2422          * ok, now we now need to find one on the list of the addresses. We
2423          * can't get one on the emitting interface so let's find first a
2424          * preferred one. If not that an acceptable one otherwise... we
2425          * return NULL.
2426          */
2427         starting_point = inp->next_addr_touse;
2428 once_again:
2429         if (inp->next_addr_touse == NULL) {
2430                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2431                 resettotop = 1;
2432         }
2433         for (laddr = inp->next_addr_touse; laddr;
2434             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2435                 if (laddr->ifa == NULL) {
2436                         /* address has been removed */
2437                         continue;
2438                 }
2439                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2440                         /* address is being deleted */
2441                         continue;
2442                 }
2443                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2444                     dest_is_priv, fam);
2445                 if (sifa == NULL)
2446                         continue;
2447                 atomic_add_int(&sifa->refcount, 1);
2448                 return (sifa);
2449         }
2450         if (resettotop == 0) {
2451                 inp->next_addr_touse = NULL;
2452                 goto once_again;
2453         }
2454         inp->next_addr_touse = starting_point;
2455         resettotop = 0;
2456 once_again_too:
2457         if (inp->next_addr_touse == NULL) {
2458                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2459                 resettotop = 1;
2460         }
2461         /* ok, what about an acceptable address in the inp */
2462         for (laddr = inp->next_addr_touse; laddr;
2463             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2464                 if (laddr->ifa == NULL) {
2465                         /* address has been removed */
2466                         continue;
2467                 }
2468                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2469                         /* address is being deleted */
2470                         continue;
2471                 }
2472                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2473                     dest_is_priv, fam);
2474                 if (sifa == NULL)
2475                         continue;
2476                 atomic_add_int(&sifa->refcount, 1);
2477                 return (sifa);
2478         }
2479         if (resettotop == 0) {
2480                 inp->next_addr_touse = NULL;
2481                 goto once_again_too;
2482         }
2483         /*
2484          * no address bound can be a source for the destination we are in
2485          * trouble
2486          */
2487         return (NULL);
2488 }
2489
2490
2491
2492 static struct sctp_ifa *
2493 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2494     struct sctp_tcb *stcb,
2495     struct sctp_nets *net,
2496     sctp_route_t * ro,
2497     uint32_t vrf_id,
2498     uint8_t dest_is_priv,
2499     uint8_t dest_is_loop,
2500     int non_asoc_addr_ok,
2501     sa_family_t fam)
2502 {
2503         struct sctp_laddr *laddr, *starting_point;
2504         void *ifn;
2505         struct sctp_ifn *sctp_ifn;
2506         struct sctp_ifa *sctp_ifa, *sifa;
2507         uint8_t start_at_beginning = 0;
2508         struct sctp_vrf *vrf;
2509         uint32_t ifn_index;
2510
2511         /*
2512          * first question, is the ifn we will emit on in our list, if so, we
2513          * want that one.
2514          */
2515         vrf = sctp_find_vrf(vrf_id);
2516         if (vrf == NULL)
2517                 return (NULL);
2518
2519         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2520         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2521         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2522
2523         /*
2524          * first question, is the ifn we will emit on in our list?  If so,
2525          * we want that one. First we look for a preferred. Second, we go
2526          * for an acceptable.
2527          */
2528         if (sctp_ifn) {
2529                 /* first try for a preferred address on the ep */
2530                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2531                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2532                                 continue;
2533                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2534                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2535                                 if (sifa == NULL)
2536                                         continue;
2537                                 if (((non_asoc_addr_ok == 0) &&
2538                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2539                                     (non_asoc_addr_ok &&
2540                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2541                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2542                                         /* on the no-no list */
2543                                         continue;
2544                                 }
2545                                 atomic_add_int(&sifa->refcount, 1);
2546                                 return (sifa);
2547                         }
2548                 }
2549                 /* next try for an acceptable address on the ep */
2550                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2551                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2552                                 continue;
2553                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2554                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2555                                 if (sifa == NULL)
2556                                         continue;
2557                                 if (((non_asoc_addr_ok == 0) &&
2558                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2559                                     (non_asoc_addr_ok &&
2560                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2561                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2562                                         /* on the no-no list */
2563                                         continue;
2564                                 }
2565                                 atomic_add_int(&sifa->refcount, 1);
2566                                 return (sifa);
2567                         }
2568                 }
2569
2570         }
2571         /*
2572          * if we can't find one like that then we must look at all addresses
2573          * bound to pick one at first preferable then secondly acceptable.
2574          */
2575         starting_point = stcb->asoc.last_used_address;
2576 sctp_from_the_top:
2577         if (stcb->asoc.last_used_address == NULL) {
2578                 start_at_beginning = 1;
2579                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2580         }
2581         /* search beginning with the last used address */
2582         for (laddr = stcb->asoc.last_used_address; laddr;
2583             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2584                 if (laddr->ifa == NULL) {
2585                         /* address has been removed */
2586                         continue;
2587                 }
2588                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2589                         /* address is being deleted */
2590                         continue;
2591                 }
2592                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2593                 if (sifa == NULL)
2594                         continue;
2595                 if (((non_asoc_addr_ok == 0) &&
2596                     (sctp_is_addr_restricted(stcb, sifa))) ||
2597                     (non_asoc_addr_ok &&
2598                     (sctp_is_addr_restricted(stcb, sifa)) &&
2599                     (!sctp_is_addr_pending(stcb, sifa)))) {
2600                         /* on the no-no list */
2601                         continue;
2602                 }
2603                 stcb->asoc.last_used_address = laddr;
2604                 atomic_add_int(&sifa->refcount, 1);
2605                 return (sifa);
2606         }
2607         if (start_at_beginning == 0) {
2608                 stcb->asoc.last_used_address = NULL;
2609                 goto sctp_from_the_top;
2610         }
2611         /* now try for any higher scope than the destination */
2612         stcb->asoc.last_used_address = starting_point;
2613         start_at_beginning = 0;
2614 sctp_from_the_top2:
2615         if (stcb->asoc.last_used_address == NULL) {
2616                 start_at_beginning = 1;
2617                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2618         }
2619         /* search beginning with the last used address */
2620         for (laddr = stcb->asoc.last_used_address; laddr;
2621             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2622                 if (laddr->ifa == NULL) {
2623                         /* address has been removed */
2624                         continue;
2625                 }
2626                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2627                         /* address is being deleted */
2628                         continue;
2629                 }
2630                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2631                     dest_is_priv, fam);
2632                 if (sifa == NULL)
2633                         continue;
2634                 if (((non_asoc_addr_ok == 0) &&
2635                     (sctp_is_addr_restricted(stcb, sifa))) ||
2636                     (non_asoc_addr_ok &&
2637                     (sctp_is_addr_restricted(stcb, sifa)) &&
2638                     (!sctp_is_addr_pending(stcb, sifa)))) {
2639                         /* on the no-no list */
2640                         continue;
2641                 }
2642                 stcb->asoc.last_used_address = laddr;
2643                 atomic_add_int(&sifa->refcount, 1);
2644                 return (sifa);
2645         }
2646         if (start_at_beginning == 0) {
2647                 stcb->asoc.last_used_address = NULL;
2648                 goto sctp_from_the_top2;
2649         }
2650         return (NULL);
2651 }
2652
2653 static struct sctp_ifa *
2654 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2655     struct sctp_tcb *stcb,
2656     int non_asoc_addr_ok,
2657     uint8_t dest_is_loop,
2658     uint8_t dest_is_priv,
2659     int addr_wanted,
2660     sa_family_t fam,
2661     sctp_route_t * ro
2662 )
2663 {
2664         struct sctp_ifa *ifa, *sifa;
2665         int num_eligible_addr = 0;
2666
2667 #ifdef INET6
2668         struct sockaddr_in6 sin6, lsa6;
2669
2670         if (fam == AF_INET6) {
2671                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2672                 (void)sa6_recoverscope(&sin6);
2673         }
2674 #endif                          /* INET6 */
2675         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2676                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2677                     (non_asoc_addr_ok == 0))
2678                         continue;
2679                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2680                     dest_is_priv, fam);
2681                 if (sifa == NULL)
2682                         continue;
2683 #ifdef INET6
2684                 if (fam == AF_INET6 &&
2685                     dest_is_loop &&
2686                     sifa->src_is_loop && sifa->src_is_priv) {
2687                         /*
2688                          * don't allow fe80::1 to be a src on loop ::1, we
2689                          * don't list it to the peer so we will get an
2690                          * abort.
2691                          */
2692                         continue;
2693                 }
2694                 if (fam == AF_INET6 &&
2695                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2696                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2697                         /*
2698                          * link-local <-> link-local must belong to the same
2699                          * scope.
2700                          */
2701                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2702                         (void)sa6_recoverscope(&lsa6);
2703                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2704                                 continue;
2705                         }
2706                 }
2707 #endif                          /* INET6 */
2708
2709                 /*
2710                  * Check if the IPv6 address matches to next-hop. In the
2711                  * mobile case, old IPv6 address may be not deleted from the
2712                  * interface. Then, the interface has previous and new
2713                  * addresses.  We should use one corresponding to the
2714                  * next-hop.  (by micchie)
2715                  */
2716 #ifdef INET6
2717                 if (stcb && fam == AF_INET6 &&
2718                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2719                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2720                             == 0) {
2721                                 continue;
2722                         }
2723                 }
2724 #endif
2725                 /* Avoid topologically incorrect IPv4 address */
2726                 if (stcb && fam == AF_INET &&
2727                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2728                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2729                                 continue;
2730                         }
2731                 }
2732                 if (stcb) {
2733                         if (((non_asoc_addr_ok == 0) &&
2734                             (sctp_is_addr_restricted(stcb, sifa))) ||
2735                             (non_asoc_addr_ok &&
2736                             (sctp_is_addr_restricted(stcb, sifa)) &&
2737                             (!sctp_is_addr_pending(stcb, sifa)))) {
2738                                 /*
2739                                  * It is restricted for some reason..
2740                                  * probably not yet added.
2741                                  */
2742                                 continue;
2743                         }
2744                 }
2745                 if (num_eligible_addr >= addr_wanted) {
2746                         return (sifa);
2747                 }
2748                 num_eligible_addr++;
2749         }
2750         return (NULL);
2751 }
2752
2753
2754 static int
2755 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2756     struct sctp_tcb *stcb,
2757     int non_asoc_addr_ok,
2758     uint8_t dest_is_loop,
2759     uint8_t dest_is_priv,
2760     sa_family_t fam)
2761 {
2762         struct sctp_ifa *ifa, *sifa;
2763         int num_eligible_addr = 0;
2764
2765         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2766                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2767                     (non_asoc_addr_ok == 0)) {
2768                         continue;
2769                 }
2770                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2771                     dest_is_priv, fam);
2772                 if (sifa == NULL) {
2773                         continue;
2774                 }
2775                 if (stcb) {
2776                         if (((non_asoc_addr_ok == 0) &&
2777                             (sctp_is_addr_restricted(stcb, sifa))) ||
2778                             (non_asoc_addr_ok &&
2779                             (sctp_is_addr_restricted(stcb, sifa)) &&
2780                             (!sctp_is_addr_pending(stcb, sifa)))) {
2781                                 /*
2782                                  * It is restricted for some reason..
2783                                  * probably not yet added.
2784                                  */
2785                                 continue;
2786                         }
2787                 }
2788                 num_eligible_addr++;
2789         }
2790         return (num_eligible_addr);
2791 }
2792
2793 static struct sctp_ifa *
2794 sctp_choose_boundall(struct sctp_inpcb *inp,
2795     struct sctp_tcb *stcb,
2796     struct sctp_nets *net,
2797     sctp_route_t * ro,
2798     uint32_t vrf_id,
2799     uint8_t dest_is_priv,
2800     uint8_t dest_is_loop,
2801     int non_asoc_addr_ok,
2802     sa_family_t fam)
2803 {
2804         int cur_addr_num = 0, num_preferred = 0;
2805         void *ifn;
2806         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2807         struct sctp_ifa *sctp_ifa, *sifa;
2808         uint32_t ifn_index;
2809         struct sctp_vrf *vrf;
2810
2811         /*-
2812          * For boundall we can use any address in the association.
2813          * If non_asoc_addr_ok is set we can use any address (at least in
2814          * theory). So we look for preferred addresses first. If we find one,
2815          * we use it. Otherwise we next try to get an address on the
2816          * interface, which we should be able to do (unless non_asoc_addr_ok
2817          * is false and we are routed out that way). In these cases where we
2818          * can't use the address of the interface we go through all the
2819          * ifn's looking for an address we can use and fill that in. Punting
2820          * means we send back address 0, which will probably cause problems
2821          * actually since then IP will fill in the address of the route ifn,
2822          * which means we probably already rejected it.. i.e. here comes an
2823          * abort :-<.
2824          */
2825         vrf = sctp_find_vrf(vrf_id);
2826         if (vrf == NULL)
2827                 return (NULL);
2828
2829         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2830         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2831         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2832         if (sctp_ifn == NULL) {
2833                 /* ?? We don't have this guy ?? */
2834                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2835                 goto bound_all_plan_b;
2836         }
2837         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2838             ifn_index, sctp_ifn->ifn_name);
2839
2840         if (net) {
2841                 cur_addr_num = net->indx_of_eligible_next_to_use;
2842         }
2843         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2844             stcb,
2845             non_asoc_addr_ok,
2846             dest_is_loop,
2847             dest_is_priv, fam);
2848         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2849             num_preferred, sctp_ifn->ifn_name);
2850         if (num_preferred == 0) {
2851                 /*
2852                  * no eligible addresses, we must use some other interface
2853                  * address if we can find one.
2854                  */
2855                 goto bound_all_plan_b;
2856         }
2857         /*
2858          * Ok we have num_eligible_addr set with how many we can use, this
2859          * may vary from call to call due to addresses being deprecated
2860          * etc..
2861          */
2862         if (cur_addr_num >= num_preferred) {
2863                 cur_addr_num = 0;
2864         }
2865         /*
2866          * select the nth address from the list (where cur_addr_num is the
2867          * nth) and 0 is the first one, 1 is the second one etc...
2868          */
2869         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2870
2871         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2872             dest_is_priv, cur_addr_num, fam, ro);
2873
2874         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2875         if (sctp_ifa) {
2876                 atomic_add_int(&sctp_ifa->refcount, 1);
2877                 if (net) {
2878                         /* save off where the next one we will want */
2879                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2880                 }
2881                 return (sctp_ifa);
2882         }
2883         /*
2884          * plan_b: Look at all interfaces and find a preferred address. If
2885          * no preferred fall through to plan_c.
2886          */
2887 bound_all_plan_b:
2888         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2889         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2890                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2891                     sctp_ifn->ifn_name);
2892                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2893                         /* wrong base scope */
2894                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2895                         continue;
2896                 }
2897                 if ((sctp_ifn == looked_at) && looked_at) {
2898                         /* already looked at this guy */
2899                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2900                         continue;
2901                 }
2902                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2903                     dest_is_loop, dest_is_priv, fam);
2904                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2905                     "Found ifn:%p %d preferred source addresses\n",
2906                     ifn, num_preferred);
2907                 if (num_preferred == 0) {
2908                         /* None on this interface. */
2909                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2910                         continue;
2911                 }
2912                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2913                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2914                     num_preferred, sctp_ifn, cur_addr_num);
2915
2916                 /*
2917                  * Ok we have num_eligible_addr set with how many we can
2918                  * use, this may vary from call to call due to addresses
2919                  * being deprecated etc..
2920                  */
2921                 if (cur_addr_num >= num_preferred) {
2922                         cur_addr_num = 0;
2923                 }
2924                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2925                     dest_is_priv, cur_addr_num, fam, ro);
2926                 if (sifa == NULL)
2927                         continue;
2928                 if (net) {
2929                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2930                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2931                             cur_addr_num);
2932                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2933                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2934                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2935                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2936                 }
2937                 atomic_add_int(&sifa->refcount, 1);
2938                 return (sifa);
2939
2940         }
2941
2942         /* plan_c: do we have an acceptable address on the emit interface */
2943         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
2944         if (emit_ifn == NULL) {
2945                 goto plan_d;
2946         }
2947         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
2948                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2949                     (non_asoc_addr_ok == 0))
2950                         continue;
2951                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
2952                     dest_is_priv, fam);
2953                 if (sifa == NULL)
2954                         continue;
2955                 if (stcb) {
2956                         if (((non_asoc_addr_ok == 0) &&
2957                             (sctp_is_addr_restricted(stcb, sifa))) ||
2958                             (non_asoc_addr_ok &&
2959                             (sctp_is_addr_restricted(stcb, sifa)) &&
2960                             (!sctp_is_addr_pending(stcb, sifa)))) {
2961                                 /*
2962                                  * It is restricted for some reason..
2963                                  * probably not yet added.
2964                                  */
2965                                 continue;
2966                         }
2967                 }
2968                 atomic_add_int(&sifa->refcount, 1);
2969                 return (sifa);
2970         }
2971 plan_d:
2972         /*
2973          * plan_d: We are in trouble. No preferred address on the emit
2974          * interface. And not even a preferred address on all interfaces. Go
2975          * out and see if we can find an acceptable address somewhere
2976          * amongst all interfaces.
2977          */
2978         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
2979         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2980                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2981                         /* wrong base scope */
2982                         continue;
2983                 }
2984                 if ((sctp_ifn == looked_at) && looked_at)
2985                         /* already looked at this guy */
2986                         continue;
2987
2988                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2989                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2990                             (non_asoc_addr_ok == 0))
2991                                 continue;
2992                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
2993                             dest_is_loop,
2994                             dest_is_priv, fam);
2995                         if (sifa == NULL)
2996                                 continue;
2997                         if (stcb) {
2998                                 if (((non_asoc_addr_ok == 0) &&
2999                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3000                                     (non_asoc_addr_ok &&
3001                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3002                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3003                                         /*
3004                                          * It is restricted for some
3005                                          * reason.. probably not yet added.
3006                                          */
3007                                         continue;
3008                                 }
3009                         }
3010                         atomic_add_int(&sifa->refcount, 1);
3011                         return (sifa);
3012                 }
3013         }
3014         /*
3015          * Ok we can find NO address to source from that is not on our
3016          * restricted list and non_asoc_address is NOT ok, or it is on our
3017          * restricted list. We can't source to it :-(
3018          */
3019         return (NULL);
3020 }
3021
3022
3023
3024 /* tcb may be NULL */
3025 struct sctp_ifa *
3026 sctp_source_address_selection(struct sctp_inpcb *inp,
3027     struct sctp_tcb *stcb,
3028     sctp_route_t * ro,
3029     struct sctp_nets *net,
3030     int non_asoc_addr_ok, uint32_t vrf_id)
3031 {
3032         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3033
3034 #ifdef INET6
3035         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3036
3037 #endif
3038         struct sctp_ifa *answer;
3039         uint8_t dest_is_priv, dest_is_loop;
3040         sa_family_t fam;
3041
3042         /*-
3043          * Rules: - Find the route if needed, cache if I can. - Look at
3044          * interface address in route, Is it in the bound list. If so we
3045          * have the best source. - If not we must rotate amongst the
3046          * addresses.
3047          *
3048          * Cavets and issues
3049          *
3050          * Do we need to pay attention to scope. We can have a private address
3051          * or a global address we are sourcing or sending to. So if we draw
3052          * it out
3053          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3054          * For V4
3055          *------------------------------------------
3056          *      source     *      dest  *  result
3057          * -----------------------------------------
3058          * <a>  Private    *    Global  *  NAT
3059          * -----------------------------------------
3060          * <b>  Private    *    Private *  No problem
3061          * -----------------------------------------
3062          * <c>  Global     *    Private *  Huh, How will this work?
3063          * -----------------------------------------
3064          * <d>  Global     *    Global  *  No Problem
3065          *------------------------------------------
3066          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3067          * For V6
3068          *------------------------------------------
3069          *      source     *      dest  *  result
3070          * -----------------------------------------
3071          * <a>  Linklocal  *    Global  *
3072          * -----------------------------------------
3073          * <b>  Linklocal  * Linklocal  *  No problem
3074          * -----------------------------------------
3075          * <c>  Global     * Linklocal  *  Huh, How will this work?
3076          * -----------------------------------------
3077          * <d>  Global     *    Global  *  No Problem
3078          *------------------------------------------
3079          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3080          *
3081          * And then we add to that what happens if there are multiple addresses
3082          * assigned to an interface. Remember the ifa on a ifn is a linked
3083          * list of addresses. So one interface can have more than one IP
3084          * address. What happens if we have both a private and a global
3085          * address? Do we then use context of destination to sort out which
3086          * one is best? And what about NAT's sending P->G may get you a NAT
3087          * translation, or should you select the G thats on the interface in
3088          * preference.
3089          *
3090          * Decisions:
3091          *
3092          * - count the number of addresses on the interface.
3093          * - if it is one, no problem except case <c>.
3094          *   For <a> we will assume a NAT out there.
3095          * - if there are more than one, then we need to worry about scope P
3096          *   or G. We should prefer G -> G and P -> P if possible.
3097          *   Then as a secondary fall back to mixed types G->P being a last
3098          *   ditch one.
3099          * - The above all works for bound all, but bound specific we need to
3100          *   use the same concept but instead only consider the bound
3101          *   addresses. If the bound set is NOT assigned to the interface then
3102          *   we must use rotation amongst the bound addresses..
3103          */
3104         if (ro->ro_rt == NULL) {
3105                 /*
3106                  * Need a route to cache.
3107                  */
3108                 SCTP_RTALLOC(ro, vrf_id);
3109         }
3110         if (ro->ro_rt == NULL) {
3111                 return (NULL);
3112         }
3113         fam = to->sin_family;
3114         dest_is_priv = dest_is_loop = 0;
3115         /* Setup our scopes for the destination */
3116         switch (fam) {
3117         case AF_INET:
3118                 /* Scope based on outbound address */
3119                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3120                         dest_is_loop = 1;
3121                         if (net != NULL) {
3122                                 /* mark it as local */
3123                                 net->addr_is_local = 1;
3124                         }
3125                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3126                         dest_is_priv = 1;
3127                 }
3128                 break;
3129 #ifdef INET6
3130         case AF_INET6:
3131                 /* Scope based on outbound address */
3132                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3133                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3134                         /*
3135                          * If the address is a loopback address, which
3136                          * consists of "::1" OR "fe80::1%lo0", we are
3137                          * loopback scope. But we don't use dest_is_priv
3138                          * (link local addresses).
3139                          */
3140                         dest_is_loop = 1;
3141                         if (net != NULL) {
3142                                 /* mark it as local */
3143                                 net->addr_is_local = 1;
3144                         }
3145                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3146                         dest_is_priv = 1;
3147                 }
3148                 break;
3149 #endif
3150         }
3151         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3152         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
3153         SCTP_IPI_ADDR_RLOCK();
3154         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3155                 /*
3156                  * Bound all case
3157                  */
3158                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3159                     dest_is_priv, dest_is_loop,
3160                     non_asoc_addr_ok, fam);
3161                 SCTP_IPI_ADDR_RUNLOCK();
3162                 return (answer);
3163         }
3164         /*
3165          * Subset bound case
3166          */
3167         if (stcb) {
3168                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3169                     vrf_id, dest_is_priv,
3170                     dest_is_loop,
3171                     non_asoc_addr_ok, fam);
3172         } else {
3173                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3174                     non_asoc_addr_ok,
3175                     dest_is_priv,
3176                     dest_is_loop, fam);
3177         }
3178         SCTP_IPI_ADDR_RUNLOCK();
3179         return (answer);
3180 }
3181
3182 static int
3183 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
3184 {
3185         struct cmsghdr cmh;
3186         int tlen, at;
3187
3188         tlen = SCTP_BUF_LEN(control);
3189         at = 0;
3190         /*
3191          * Independent of how many mbufs, find the c_type inside the control
3192          * structure and copy out the data.
3193          */
3194         while (at < tlen) {
3195                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3196                         /* not enough room for one more we are done. */
3197                         return (0);
3198                 }
3199                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3200                 if (((int)cmh.cmsg_len + at) > tlen) {
3201                         /*
3202                          * this is real messed up since there is not enough
3203                          * data here to cover the cmsg header. We are done.
3204                          */
3205                         return (0);
3206                 }
3207                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3208                     (c_type == cmh.cmsg_type)) {
3209                         /* found the one we want, copy it out */
3210                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
3211                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3212                                 /*
3213                                  * space of cmsg_len after header not big
3214                                  * enough
3215                                  */
3216                                 return (0);
3217                         }
3218                         m_copydata(control, at, cpsize, data);
3219                         return (1);
3220                 } else {
3221                         at += CMSG_ALIGN(cmh.cmsg_len);
3222                         if (cmh.cmsg_len == 0) {
3223                                 break;
3224                         }
3225                 }
3226         }
3227         /* not found */
3228         return (0);
3229 }
3230
3231 static struct mbuf *
3232 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3233     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3234 {
3235         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3236         struct sctp_state_cookie *stc;
3237         struct sctp_paramhdr *ph;
3238         uint8_t *foo;
3239         int sig_offset;
3240         uint16_t cookie_sz;
3241
3242         mret = NULL;
3243         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3244             sizeof(struct sctp_paramhdr)), 0,
3245             M_DONTWAIT, 1, MT_DATA);
3246         if (mret == NULL) {
3247                 return (NULL);
3248         }
3249         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3250         if (copy_init == NULL) {
3251                 sctp_m_freem(mret);
3252                 return (NULL);
3253         }
3254 #ifdef SCTP_MBUF_LOGGING
3255         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3256                 struct mbuf *mat;
3257
3258                 mat = copy_init;
3259                 while (mat) {
3260                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3261                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3262                         }
3263                         mat = SCTP_BUF_NEXT(mat);
3264                 }
3265         }
3266 #endif
3267         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3268             M_DONTWAIT);
3269         if (copy_initack == NULL) {
3270                 sctp_m_freem(mret);
3271                 sctp_m_freem(copy_init);
3272                 return (NULL);
3273         }
3274 #ifdef SCTP_MBUF_LOGGING
3275         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3276                 struct mbuf *mat;
3277
3278                 mat = copy_initack;
3279                 while (mat) {
3280                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3281                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3282                         }
3283                         mat = SCTP_BUF_NEXT(mat);
3284                 }
3285         }
3286 #endif
3287         /* easy side we just drop it on the end */
3288         ph = mtod(mret, struct sctp_paramhdr *);
3289         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3290             sizeof(struct sctp_paramhdr);
3291         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3292             sizeof(struct sctp_paramhdr));
3293         ph->param_type = htons(SCTP_STATE_COOKIE);
3294         ph->param_length = 0;   /* fill in at the end */
3295         /* Fill in the stc cookie data */
3296         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3297
3298         /* tack the INIT and then the INIT-ACK onto the chain */
3299         cookie_sz = 0;
3300         m_at = mret;
3301         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3302                 cookie_sz += SCTP_BUF_LEN(m_at);
3303                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3304                         SCTP_BUF_NEXT(m_at) = copy_init;
3305                         break;
3306                 }
3307         }
3308
3309         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3310                 cookie_sz += SCTP_BUF_LEN(m_at);
3311                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3312                         SCTP_BUF_NEXT(m_at) = copy_initack;
3313                         break;
3314                 }
3315         }
3316
3317         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3318                 cookie_sz += SCTP_BUF_LEN(m_at);
3319                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3320                         break;
3321                 }
3322         }
3323         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3324         if (sig == NULL) {
3325                 /* no space, so free the entire chain */
3326                 sctp_m_freem(mret);
3327                 return (NULL);
3328         }
3329         SCTP_BUF_LEN(sig) = 0;
3330         SCTP_BUF_NEXT(m_at) = sig;
3331         sig_offset = 0;
3332         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3333         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3334         *signature = foo;
3335         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3336         cookie_sz += SCTP_SIGNATURE_SIZE;
3337         ph->param_length = htons(cookie_sz);
3338         return (mret);
3339 }
3340
3341
3342 static uint8_t
3343 sctp_get_ect(struct sctp_tcb *stcb,
3344     struct sctp_tmit_chunk *chk)
3345 {
3346         uint8_t this_random;
3347
3348         /* Huh? */
3349         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 0)
3350                 return (0);
3351
3352         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce) == 0)
3353                 /* no nonce, always return ECT0 */
3354                 return (SCTP_ECT0_BIT);
3355
3356         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
3357                 /* Peer does NOT support it, so we send a ECT0 only */
3358                 return (SCTP_ECT0_BIT);
3359         }
3360         if (chk == NULL)
3361                 return (SCTP_ECT0_BIT);
3362
3363         if ((stcb->asoc.hb_random_idx > 3) ||
3364             ((stcb->asoc.hb_random_idx == 3) &&
3365             (stcb->asoc.hb_ect_randombit > 7))) {
3366                 uint32_t rndval;
3367
3368 warp_drive_sa:
3369                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
3370                 memcpy(stcb->asoc.hb_random_values, &rndval,
3371                     sizeof(stcb->asoc.hb_random_values));
3372                 this_random = stcb->asoc.hb_random_values[0];
3373                 stcb->asoc.hb_random_idx = 0;
3374                 stcb->asoc.hb_ect_randombit = 0;
3375         } else {
3376                 if (stcb->asoc.hb_ect_randombit > 7) {
3377                         stcb->asoc.hb_ect_randombit = 0;
3378                         stcb->asoc.hb_random_idx++;
3379                         if (stcb->asoc.hb_random_idx > 3) {
3380                                 goto warp_drive_sa;
3381                         }
3382                 }
3383                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
3384         }
3385         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
3386                 if (chk != NULL)
3387                         /* ECN Nonce stuff */
3388                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
3389                 stcb->asoc.hb_ect_randombit++;
3390                 return (SCTP_ECT1_BIT);
3391         } else {
3392                 stcb->asoc.hb_ect_randombit++;
3393                 return (SCTP_ECT0_BIT);
3394         }
3395 }
3396
3397 static int
3398 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3399     struct sctp_tcb *stcb,      /* may be NULL */
3400     struct sctp_nets *net,
3401     struct sockaddr *to,
3402     struct mbuf *m,
3403     uint32_t auth_offset,
3404     struct sctp_auth_chunk *auth,
3405     int nofragment_flag,
3406     int ecn_ok,
3407     struct sctp_tmit_chunk *chk,
3408     int out_of_asoc_ok,
3409     uint16_t port,
3410     int so_locked,
3411 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3412     SCTP_UNUSED
3413 #endif
3414     union sctp_sockstore *over_addr
3415 )
3416 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3417 {
3418         /*
3419          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3420          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3421          * structure: - fill in the HMAC digest of any AUTH chunk in the
3422          * packet. - calculate and fill in the SCTP checksum. - prepend an
3423          * IP address header. - if boundall use INADDR_ANY. - if
3424          * boundspecific do source address selection. - set fragmentation
3425          * option for ipV4. - On return from IP output, check/adjust mtu
3426          * size of output interface and smallest_mtu size as well.
3427          */
3428         /* Will need ifdefs around this */
3429         struct mbuf *o_pak;
3430         struct mbuf *newm;
3431         struct sctphdr *sctphdr;
3432         int packet_length;
3433         uint32_t csum;
3434         int ret;
3435         uint32_t vrf_id;
3436         sctp_route_t *ro = NULL;
3437         struct udphdr *udp = NULL;
3438
3439 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3440         struct socket *so = NULL;
3441
3442 #endif
3443
3444         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3445                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3446                 sctp_m_freem(m);
3447                 return (EFAULT);
3448         }
3449         if (stcb) {
3450                 vrf_id = stcb->asoc.vrf_id;
3451         } else {
3452                 vrf_id = inp->def_vrf_id;
3453         }
3454
3455         /* fill in the HMAC digest for any AUTH chunk in the packet */
3456         if ((auth != NULL) && (stcb != NULL)) {
3457                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb);
3458         }
3459         /* Calculate the csum and fill in the length of the packet */
3460         sctphdr = mtod(m, struct sctphdr *);
3461         if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3462             (stcb) &&
3463             (to->sa_family == AF_INET) &&
3464             (stcb->asoc.loopback_scope)) {
3465                 sctphdr->checksum = 0;
3466                 /*
3467                  * This can probably now be taken out since my audit shows
3468                  * no more bad pktlen's coming in. But we will wait a while
3469                  * yet.
3470                  */
3471                 packet_length = sctp_calculate_len(m);
3472         } else {
3473                 sctphdr->checksum = 0;
3474                 csum = sctp_calculate_sum(m, &packet_length, 0);
3475                 sctphdr->checksum = csum;
3476         }
3477
3478         if (to->sa_family == AF_INET) {
3479                 struct ip *ip = NULL;
3480                 sctp_route_t iproute;
3481                 uint8_t tos_value;
3482
3483                 if (port) {
3484                         newm = sctp_get_mbuf_for_msg(sizeof(struct ip) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
3485                 } else {
3486                         newm = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
3487                 }
3488                 if (newm == NULL) {
3489                         sctp_m_freem(m);
3490                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3491                         return (ENOMEM);
3492                 }
3493                 if (port) {
3494                         SCTP_ALIGN_TO_END(newm, sizeof(struct ip) + sizeof(struct udphdr));
3495                         SCTP_BUF_LEN(newm) = sizeof(struct ip) + sizeof(struct udphdr);
3496                         packet_length += sizeof(struct ip) + sizeof(struct udphdr);
3497                 } else {
3498                         SCTP_ALIGN_TO_END(newm, sizeof(struct ip));
3499                         SCTP_BUF_LEN(newm) = sizeof(struct ip);
3500                         packet_length += sizeof(struct ip);
3501                 }
3502                 SCTP_BUF_NEXT(newm) = m;
3503                 m = newm;
3504                 ip = mtod(m, struct ip *);
3505                 ip->ip_v = IPVERSION;
3506                 ip->ip_hl = (sizeof(struct ip) >> 2);
3507                 if (net) {
3508                         tos_value = net->tos_flowlabel & 0x000000ff;
3509                 } else {
3510                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3511                 }
3512                 if ((nofragment_flag) && (port == 0)) {
3513 #if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__) || defined(__Userspace__)
3514                         ip->ip_off = IP_DF;
3515 #else
3516                         ip->ip_off = htons(IP_DF);
3517 #endif
3518                 } else
3519                         ip->ip_off = 0;
3520
3521                 /* FreeBSD has a function for ip_id's */
3522                 ip->ip_id = ip_newid();
3523
3524                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3525                 ip->ip_len = packet_length;
3526                 if (stcb) {
3527                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3528                                 /* Enable ECN */
3529                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
3530                         } else {
3531                                 /* No ECN */
3532                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
3533                         }
3534                 } else {
3535                         /* no association at all */
3536                         ip->ip_tos = (tos_value & 0xfc);
3537                 }
3538                 if (port) {
3539                         ip->ip_p = IPPROTO_UDP;
3540                 } else {
3541                         ip->ip_p = IPPROTO_SCTP;
3542                 }
3543                 ip->ip_sum = 0;
3544                 if (net == NULL) {
3545                         ro = &iproute;
3546                         memset(&iproute, 0, sizeof(iproute));
3547                         memcpy(&ro->ro_dst, to, to->sa_len);
3548                 } else {
3549                         ro = (sctp_route_t *) & net->ro;
3550                 }
3551                 /* Now the address selection part */
3552                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3553
3554                 /* call the routine to select the src address */
3555                 if (net && out_of_asoc_ok == 0) {
3556                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3557                                 sctp_free_ifa(net->ro._s_addr);
3558                                 net->ro._s_addr = NULL;
3559                                 net->src_addr_selected = 0;
3560                                 if (ro->ro_rt) {
3561                                         RTFREE(ro->ro_rt);
3562                                         ro->ro_rt = NULL;
3563                                 }
3564                         }
3565                         if (net->src_addr_selected == 0) {
3566                                 /* Cache the source address */
3567                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3568                                     ro, net, 0,
3569                                     vrf_id);
3570                                 net->src_addr_selected = 1;
3571                         }
3572                         if (net->ro._s_addr == NULL) {
3573                                 /* No route to host */
3574                                 net->src_addr_selected = 0;
3575                                 goto no_route;
3576                         }
3577                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3578                 } else {
3579                         if (over_addr == NULL) {
3580                                 struct sctp_ifa *_lsrc;
3581
3582                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3583                                     net,
3584                                     out_of_asoc_ok,
3585                                     vrf_id);
3586                                 if (_lsrc == NULL) {
3587                                         goto no_route;
3588                                 }
3589                                 ip->ip_src = _lsrc->address.sin.sin_addr;
3590                                 sctp_free_ifa(_lsrc);
3591                         } else {
3592                                 ip->ip_src = over_addr->sin.sin_addr;
3593                                 SCTP_RTALLOC((&ro->ro_rt), vrf_id);
3594                         }
3595                 }
3596                 if (port) {
3597                         udp = (struct udphdr *)(ip + 1);
3598                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3599                         udp->uh_dport = port;
3600                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
3601                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
3602                 }
3603                 /*
3604                  * If source address selection fails and we find no route
3605                  * then the ip_output should fail as well with a
3606                  * NO_ROUTE_TO_HOST type error. We probably should catch
3607                  * that somewhere and abort the association right away
3608                  * (assuming this is an INIT being sent).
3609                  */
3610                 if ((ro->ro_rt == NULL)) {
3611                         /*
3612                          * src addr selection failed to find a route (or
3613                          * valid source addr), so we can't get there from
3614                          * here (yet)!
3615                          */
3616         no_route:
3617                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3618                             "%s: dropped packet - no valid source addr\n",
3619                             __FUNCTION__);
3620                         if (net) {
3621                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3622                                     "Destination was ");
3623                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3624                                     &net->ro._l_addr.sa);
3625                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3626                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3627                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3628                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3629                                                     stcb,
3630                                                     SCTP_FAILED_THRESHOLD,
3631                                                     (void *)net,
3632                                                     so_locked);
3633                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3634                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3635                                                 /*
3636                                                  * JRS 5/14/07 - If a
3637                                                  * destination is
3638                                                  * unreachable, the PF bit
3639                                                  * is turned off.  This
3640                                                  * allows an unambiguous use
3641                                                  * of the PF bit for
3642                                                  * destinations that are
3643                                                  * reachable but potentially
3644                                                  * failed. If the
3645                                                  * destination is set to the
3646                                                  * unreachable state, also
3647                                                  * set the destination to
3648                                                  * the PF state.
3649                                                  */
3650                                                 /*
3651                                                  * Add debug message here if
3652                                                  * destination is not in PF
3653                                                  * state.
3654                                                  */
3655                                                 /*
3656                                                  * Stop any running T3
3657                                                  * timers here?
3658                                                  */
3659                                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
3660                                                         net->dest_state &= ~SCTP_ADDR_PF;
3661                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3662                                                             net);
3663                                                 }
3664                                         }
3665                                 }
3666                                 if (stcb) {
3667                                         if (net == stcb->asoc.primary_destination) {
3668                                                 /* need a new primary */
3669                                                 struct sctp_nets *alt;
3670
3671                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3672                                                 if (alt != net) {
3673                                                         if (sctp_set_primary_addr(stcb,
3674                                                             (struct sockaddr *)NULL,
3675                                                             alt) == 0) {
3676                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3677                                                                 if (net->ro._s_addr) {
3678                                                                         sctp_free_ifa(net->ro._s_addr);
3679                                                                         net->ro._s_addr = NULL;
3680                                                                 }
3681                                                                 net->src_addr_selected = 0;
3682                                                         }
3683                                                 }
3684                                         }
3685                                 }
3686                         }
3687                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3688                         sctp_m_freem(m);
3689                         return (EHOSTUNREACH);
3690                 }
3691                 if (ro != &iproute) {
3692                         memcpy(&iproute, ro, sizeof(*ro));
3693                 }
3694                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3695                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3696                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3697                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3698                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3699                     ro->ro_rt);
3700
3701                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3702                         /* failed to prepend data, give up */
3703                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3704                         sctp_m_freem(m);
3705                         return (ENOMEM);
3706                 }
3707 #ifdef  SCTP_PACKET_LOGGING
3708                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3709                         sctp_packet_log(m, packet_length);
3710 #endif
3711                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3712                 if (port) {
3713                         SCTP_ENABLE_UDP_CSUM(o_pak);
3714                 }
3715                 /* send it out.  table id is taken from stcb */
3716 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3717                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3718                         so = SCTP_INP_SO(inp);
3719                         SCTP_SOCKET_UNLOCK(so, 0);
3720                 }
3721 #endif
3722                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3723 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3724                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3725                         atomic_add_int(&stcb->asoc.refcnt, 1);
3726                         SCTP_TCB_UNLOCK(stcb);
3727                         SCTP_SOCKET_LOCK(so, 0);
3728                         SCTP_TCB_LOCK(stcb);
3729                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3730                 }
3731 #endif
3732                 SCTP_STAT_INCR(sctps_sendpackets);
3733                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3734                 if (ret)
3735                         SCTP_STAT_INCR(sctps_senderrors);
3736
3737                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3738                 if (net == NULL) {
3739                         /* free tempy routes */
3740                         if (ro->ro_rt) {
3741                                 RTFREE(ro->ro_rt);
3742                                 ro->ro_rt = NULL;
3743                         }
3744                 } else {
3745                         /* PMTU check versus smallest asoc MTU goes here */
3746                         if ((ro->ro_rt != NULL) &&
3747                             (net->ro._s_addr)) {
3748                                 uint32_t mtu;
3749
3750                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3751                                 if (mtu &&
3752                                     (stcb->asoc.smallest_mtu > mtu)) {
3753 #ifdef SCTP_PRINT_FOR_B_AND_M
3754                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n",
3755                                             mtu);
3756 #endif
3757                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3758                                         net->mtu = mtu;
3759                                 }
3760                         } else if (ro->ro_rt == NULL) {
3761                                 /* route was freed */
3762                                 if (net->ro._s_addr &&
3763                                     net->src_addr_selected) {
3764                                         sctp_free_ifa(net->ro._s_addr);
3765                                         net->ro._s_addr = NULL;
3766                                 }
3767                                 net->src_addr_selected = 0;
3768                         }
3769                 }
3770                 return (ret);
3771         }
3772 #ifdef INET6
3773         else if (to->sa_family == AF_INET6) {
3774                 uint32_t flowlabel;
3775                 struct ip6_hdr *ip6h;
3776                 struct route_in6 ip6route;
3777                 struct ifnet *ifp;
3778                 u_char flowTop;
3779                 uint16_t flowBottom;
3780                 u_char tosBottom, tosTop;
3781                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3782                 int prev_scope = 0;
3783                 struct sockaddr_in6 lsa6_storage;
3784                 int error;
3785                 u_short prev_port = 0;
3786
3787                 if (net != NULL) {
3788                         flowlabel = net->tos_flowlabel;
3789                 } else {
3790                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3791                 }
3792
3793                 if (port) {
3794                         newm = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
3795                 } else {
3796                         newm = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
3797                 }
3798                 if (newm == NULL) {
3799                         sctp_m_freem(m);
3800                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3801                         return (ENOMEM);
3802                 }
3803                 if (port) {
3804                         SCTP_ALIGN_TO_END(newm, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
3805                         SCTP_BUF_LEN(newm) = sizeof(struct ip6_hdr) + sizeof(struct udphdr);
3806                         packet_length += sizeof(struct ip6_hdr) + sizeof(struct udphdr);
3807                 } else {
3808                         SCTP_ALIGN_TO_END(newm, sizeof(struct ip6_hdr));
3809                         SCTP_BUF_LEN(newm) = sizeof(struct ip6_hdr);
3810                         packet_length += sizeof(struct ip6_hdr);
3811                 }
3812                 SCTP_BUF_NEXT(newm) = m;
3813                 m = newm;
3814
3815                 ip6h = mtod(m, struct ip6_hdr *);
3816                 /*
3817                  * We assume here that inp_flow is in host byte order within
3818                  * the TCB!
3819                  */
3820                 flowBottom = flowlabel & 0x0000ffff;
3821                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3822                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3823                 /* protect *sin6 from overwrite */
3824                 sin6 = (struct sockaddr_in6 *)to;
3825                 tmp = *sin6;
3826                 sin6 = &tmp;
3827
3828                 /* KAME hack: embed scopeid */
3829                 if (sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone)) != 0) {
3830                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3831                         return (EINVAL);
3832                 }
3833                 if (net == NULL) {
3834                         memset(&ip6route, 0, sizeof(ip6route));
3835                         ro = (sctp_route_t *) & ip6route;
3836                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3837                 } else {
3838                         ro = (sctp_route_t *) & net->ro;
3839                 }
3840                 if (stcb != NULL) {
3841                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
3842                                 /* Enable ECN */
3843                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
3844                         } else {
3845                                 /* No ECN */
3846                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3847                         }
3848                 } else {
3849                         /* we could get no asoc if it is a O-O-T-B packet */
3850                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
3851                 }
3852                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3853                 if (port) {
3854                         ip6h->ip6_nxt = IPPROTO_UDP;
3855                 } else {
3856                         ip6h->ip6_nxt = IPPROTO_SCTP;
3857                 }
3858                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3859                 ip6h->ip6_dst = sin6->sin6_addr;
3860
3861                 /*
3862                  * Add SRC address selection here: we can only reuse to a
3863                  * limited degree the kame src-addr-sel, since we can try
3864                  * their selection but it may not be bound.
3865                  */
3866                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3867                 lsa6_tmp.sin6_family = AF_INET6;
3868                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3869                 lsa6 = &lsa6_tmp;
3870                 if (net && out_of_asoc_ok == 0) {
3871                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3872                                 sctp_free_ifa(net->ro._s_addr);
3873                                 net->ro._s_addr = NULL;
3874                                 net->src_addr_selected = 0;
3875                                 if (ro->ro_rt) {
3876                                         RTFREE(ro->ro_rt);
3877                                         ro->ro_rt = NULL;
3878                                 }
3879                         }
3880                         if (net->src_addr_selected == 0) {
3881                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3882                                 /* KAME hack: embed scopeid */
3883                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone)) != 0) {
3884                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3885                                         return (EINVAL);
3886                                 }
3887                                 /* Cache the source address */
3888                                 net->ro._s_addr = sctp_source_address_selection(inp,
3889                                     stcb,
3890                                     ro,
3891                                     net,
3892                                     0,
3893                                     vrf_id);
3894                                 (void)sa6_recoverscope(sin6);
3895                                 net->src_addr_selected = 1;
3896                         }
3897                         if (net->ro._s_addr == NULL) {
3898                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3899                                 net->src_addr_selected = 0;
3900                                 goto no_route;
3901                         }
3902                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3903                 } else {
3904                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
3905                         /* KAME hack: embed scopeid */
3906                         if (sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone)) != 0) {
3907                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3908                                 return (EINVAL);
3909                         }
3910                         if (over_addr == NULL) {
3911                                 struct sctp_ifa *_lsrc;
3912
3913                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3914                                     net,
3915                                     out_of_asoc_ok,
3916                                     vrf_id);
3917                                 if (_lsrc == NULL) {
3918                                         goto no_route;
3919                                 }
3920                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3921                                 sctp_free_ifa(_lsrc);
3922                         } else {
3923                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
3924                                 SCTP_RTALLOC((&ro->ro_rt), vrf_id);
3925                         }
3926                         (void)sa6_recoverscope(sin6);
3927                 }
3928                 lsa6->sin6_port = inp->sctp_lport;
3929
3930                 if (ro->ro_rt == NULL) {
3931                         /*
3932                          * src addr selection failed to find a route (or
3933                          * valid source addr), so we can't get there from
3934                          * here!
3935                          */
3936                         goto no_route;
3937                 }
3938                 /*
3939                  * XXX: sa6 may not have a valid sin6_scope_id in the
3940                  * non-SCOPEDROUTING case.
3941                  */
3942                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3943                 lsa6_storage.sin6_family = AF_INET6;
3944                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3945                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3946                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3947                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3948                         sctp_m_freem(m);
3949                         return (error);
3950                 }
3951                 /* XXX */
3952                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3953                 lsa6_storage.sin6_port = inp->sctp_lport;
3954                 lsa6 = &lsa6_storage;
3955                 ip6h->ip6_src = lsa6->sin6_addr;
3956
3957                 if (port) {
3958                         udp = (struct udphdr *)(ip6h + 1);
3959                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3960                         udp->uh_dport = port;
3961                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
3962                         udp->uh_sum = 0;
3963                 }
3964                 /*
3965                  * We set the hop limit now since there is a good chance
3966                  * that our ro pointer is now filled
3967                  */
3968                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
3969                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
3970
3971 #ifdef SCTP_DEBUG
3972                 /* Copy to be sure something bad is not happening */
3973                 sin6->sin6_addr = ip6h->ip6_dst;
3974                 lsa6->sin6_addr = ip6h->ip6_src;
3975 #endif
3976
3977                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
3978                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
3979                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
3980                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
3981                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
3982                 if (net) {
3983                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3984                         /* preserve the port and scope for link local send */
3985                         prev_scope = sin6->sin6_scope_id;
3986                         prev_port = sin6->sin6_port;
3987                 }
3988                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3989                         /* failed to prepend data, give up */
3990                         sctp_m_freem(m);
3991                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3992                         return (ENOMEM);
3993                 }
3994 #ifdef  SCTP_PACKET_LOGGING
3995                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3996                         sctp_packet_log(m, packet_length);
3997 #endif
3998                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3999                 if (port) {
4000                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4001                                 udp->uh_sum = 0xffff;
4002                         }
4003                 }
4004                 /* send it out. table id is taken from stcb */
4005 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4006                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4007                         so = SCTP_INP_SO(inp);
4008                         SCTP_SOCKET_UNLOCK(so, 0);
4009                 }
4010 #endif
4011                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4012 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4014                         atomic_add_int(&stcb->asoc.refcnt, 1);
4015                         SCTP_TCB_UNLOCK(stcb);
4016                         SCTP_SOCKET_LOCK(so, 0);
4017                         SCTP_TCB_LOCK(stcb);
4018                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4019                 }
4020 #endif
4021                 if (net) {
4022                         /* for link local this must be done */
4023                         sin6->sin6_scope_id = prev_scope;
4024                         sin6->sin6_port = prev_port;
4025                 }
4026                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4027                 SCTP_STAT_INCR(sctps_sendpackets);
4028                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4029                 if (ret) {
4030                         SCTP_STAT_INCR(sctps_senderrors);
4031                 }
4032                 if (net == NULL) {
4033                         /* Now if we had a temp route free it */
4034                         if (ro->ro_rt) {
4035                                 RTFREE(ro->ro_rt);
4036                         }
4037                 } else {
4038                         /* PMTU check versus smallest asoc MTU goes here */
4039                         if (ro->ro_rt == NULL) {
4040                                 /* Route was freed */
4041                                 if (net->ro._s_addr &&
4042                                     net->src_addr_selected) {
4043                                         sctp_free_ifa(net->ro._s_addr);
4044                                         net->ro._s_addr = NULL;
4045                                 }
4046                                 net->src_addr_selected = 0;
4047                         }
4048                         if ((ro->ro_rt != NULL) &&
4049                             (net->ro._s_addr)) {
4050                                 uint32_t mtu;
4051
4052                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4053                                 if (mtu &&
4054                                     (stcb->asoc.smallest_mtu > mtu)) {
4055 #ifdef SCTP_PRINT_FOR_B_AND_M
4056                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
4057                                             mtu);
4058 #endif
4059                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4060                                         net->mtu = mtu;
4061                                 }
4062                         } else if (ifp) {
4063                                 if (ND_IFINFO(ifp)->linkmtu &&
4064                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4065 #ifdef SCTP_PRINT_FOR_B_AND_M
4066                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
4067                                             ND_IFINFO(ifp)->linkmtu);
4068 #endif
4069                                         sctp_mtu_size_reset(inp,
4070                                             &stcb->asoc,
4071                                             ND_IFINFO(ifp)->linkmtu);
4072                                 }
4073                         }
4074                 }
4075                 return (ret);
4076         }
4077 #endif
4078         else {
4079                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4080                     ((struct sockaddr *)to)->sa_family);
4081                 sctp_m_freem(m);
4082                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4083                 return (EFAULT);
4084         }
4085 }
4086
4087
4088 void
4089 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4090 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4091     SCTP_UNUSED
4092 #endif
4093 )
4094 {
4095         struct mbuf *m, *m_at, *mp_last;
4096         struct sctp_nets *net;
4097         struct sctp_init_msg *initm;
4098         struct sctp_supported_addr_param *sup_addr;
4099         struct sctp_ecn_supported_param *ecn;
4100         struct sctp_prsctp_supported_param *prsctp;
4101         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4102         struct sctp_supported_chunk_types_param *pr_supported;
4103         int cnt_inits_to = 0;
4104         int padval, ret;
4105         int num_ext;
4106         int p_len;
4107
4108         /* INIT's always go to the primary (and usually ONLY address) */
4109         mp_last = NULL;
4110         net = stcb->asoc.primary_destination;
4111         if (net == NULL) {
4112                 net = TAILQ_FIRST(&stcb->asoc.nets);
4113                 if (net == NULL) {
4114                         /* TSNH */
4115                         return;
4116                 }
4117                 /* we confirm any address we send an INIT to */
4118                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4119                 (void)sctp_set_primary_addr(stcb, NULL, net);
4120         } else {
4121                 /* we confirm any address we send an INIT to */
4122                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4123         }
4124         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4125 #ifdef INET6
4126         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4127                 /*
4128                  * special hook, if we are sending to link local it will not
4129                  * show up in our private address count.
4130                  */
4131                 struct sockaddr_in6 *sin6l;
4132
4133                 sin6l = &net->ro._l_addr.sin6;
4134                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4135                         cnt_inits_to = 1;
4136         }
4137 #endif
4138         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4139                 /* This case should not happen */
4140                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4141                 return;
4142         }
4143         /* start the INIT timer */
4144         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4145
4146         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4147         if (m == NULL) {
4148                 /* No memory, INIT timer will re-attempt. */
4149                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4150                 return;
4151         }
4152         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
4153         /*
4154          * assume peer supports asconf in order to be able to queue local
4155          * address changes while an INIT is in flight and before the assoc
4156          * is established.
4157          */
4158         stcb->asoc.peer_supports_asconf = 1;
4159         /* Now lets put the SCTP header in place */
4160         initm = mtod(m, struct sctp_init_msg *);
4161         initm->sh.src_port = inp->sctp_lport;
4162         initm->sh.dest_port = stcb->rport;
4163         initm->sh.v_tag = 0;
4164         initm->sh.checksum = 0; /* calculate later */
4165         /* now the chunk header */
4166         initm->msg.ch.chunk_type = SCTP_INITIATION;
4167         initm->msg.ch.chunk_flags = 0;
4168         /* fill in later from mbuf we build */
4169         initm->msg.ch.chunk_length = 0;
4170         /* place in my tag */
4171         initm->msg.init.initiate_tag = htonl(stcb->asoc.my_vtag);
4172         /* set up some of the credits. */
4173         initm->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(inp->sctp_socket),
4174             SCTP_MINIMAL_RWND));
4175
4176         initm->msg.init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4177         initm->msg.init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4178         initm->msg.init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4179         /* now the address restriction */
4180         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)initm +
4181             sizeof(*initm));
4182         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4183 #ifdef INET6
4184         /* we support 2 types: IPv6/IPv4 */
4185         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4186         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4187         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4188 #else
4189         /* we support 1 type: IPv4 */
4190         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4191         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4192         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4193 #endif
4194         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4195
4196         if (inp->sctp_ep.adaptation_layer_indicator) {
4197                 struct sctp_adaptation_layer_indication *ali;
4198
4199                 ali = (struct sctp_adaptation_layer_indication *)(
4200                     (caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4201                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4202                 ali->ph.param_length = htons(sizeof(*ali));
4203                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4204                 SCTP_BUF_LEN(m) += sizeof(*ali);
4205                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
4206                     sizeof(*ali));
4207         } else {
4208                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)sup_addr +
4209                     sizeof(*sup_addr) + sizeof(uint16_t));
4210         }
4211
4212         /* now any cookie time extensions */
4213         if (stcb->asoc.cookie_preserve_req) {
4214                 struct sctp_cookie_perserve_param *cookie_preserve;
4215
4216                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4217                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4218                 cookie_preserve->ph.param_length = htons(
4219                     sizeof(*cookie_preserve));
4220                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4221                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4222                 ecn = (struct sctp_ecn_supported_param *)(
4223                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4224                 stcb->asoc.cookie_preserve_req = 0;
4225         }
4226         /* ECN parameter */
4227         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4228                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4229                 ecn->ph.param_length = htons(sizeof(*ecn));
4230                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4231                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4232                     sizeof(*ecn));
4233         } else {
4234                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4235         }
4236         /* And now tell the peer we do pr-sctp */
4237         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4238         prsctp->ph.param_length = htons(sizeof(*prsctp));
4239         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4240
4241         /* And now tell the peer we do all the extensions */
4242         pr_supported = (struct sctp_supported_chunk_types_param *)
4243             ((caddr_t)prsctp + sizeof(*prsctp));
4244         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4245         num_ext = 0;
4246         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4247         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4248         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4249         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4250         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4251         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
4252                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4253         p_len = sizeof(*pr_supported) + num_ext;
4254         pr_supported->ph.param_length = htons(p_len);
4255         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4256         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4257
4258         /* ECN nonce: And now tell the peer we support ECN nonce */
4259         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
4260                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4261                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4262                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4263                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4264                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4265         }
4266         /* add authentication parameters */
4267         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4268                 struct sctp_auth_random *randp;
4269                 struct sctp_auth_hmac_algo *hmacs;
4270                 struct sctp_auth_chunk_list *chunks;
4271
4272                 /* attach RANDOM parameter, if available */
4273                 if (stcb->asoc.authinfo.random != NULL) {
4274                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4275                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4276 #ifdef SCTP_AUTH_DRAFT_04
4277                         randp->ph.param_type = htons(SCTP_RANDOM);
4278                         randp->ph.param_length = htons(p_len);
4279                         bcopy(stcb->asoc.authinfo.random->key,
4280                             randp->random_data,
4281                             stcb->asoc.authinfo.random_len);
4282 #else
4283                         /* random key already contains the header */
4284                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4285 #endif
4286                         /* zero out any padding required */
4287                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4288                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4289                 }
4290                 /* add HMAC_ALGO parameter */
4291                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4292                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4293                     (uint8_t *) hmacs->hmac_ids);
4294                 if (p_len > 0) {
4295                         p_len += sizeof(*hmacs);
4296                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4297                         hmacs->ph.param_length = htons(p_len);
4298                         /* zero out any padding required */
4299                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4300                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4301                 }
4302                 /* add CHUNKS parameter */
4303                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4304                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4305                     chunks->chunk_types);
4306                 if (p_len > 0) {
4307                         p_len += sizeof(*chunks);
4308                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4309                         chunks->ph.param_length = htons(p_len);
4310                         /* zero out any padding required */
4311                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4312                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4313                 }
4314         }
4315         m_at = m;
4316         /* now the addresses */
4317         {
4318                 struct sctp_scoping scp;
4319
4320                 /*
4321                  * To optimize this we could put the scoping stuff into a
4322                  * structure and remove the individual uint8's from the
4323                  * assoc structure. Then we could just sifa in the address
4324                  * within the stcb.. but for now this is a quick hack to get
4325                  * the address stuff teased apart.
4326                  */
4327                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4328                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4329                 scp.loopback_scope = stcb->asoc.loopback_scope;
4330                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4331                 scp.local_scope = stcb->asoc.local_scope;
4332                 scp.site_scope = stcb->asoc.site_scope;
4333
4334                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4335         }
4336
4337         /* calulate the size and update pkt header and chunk header */
4338         p_len = 0;
4339         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4340                 if (SCTP_BUF_NEXT(m_at) == NULL)
4341                         mp_last = m_at;
4342                 p_len += SCTP_BUF_LEN(m_at);
4343         }
4344         initm->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
4345         /*
4346          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4347          * here since the timer will drive a retranmission.
4348          */
4349
4350         /* I don't expect this to execute but we will be safe here */
4351         padval = p_len % 4;
4352         if ((padval) && (mp_last)) {
4353                 /*
4354                  * The compiler worries that mp_last may not be set even
4355                  * though I think it is impossible :-> however we add
4356                  * mp_last here just in case.
4357                  */
4358                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4359                 if (ret) {
4360                         /* Houston we have a problem, no space */
4361                         sctp_m_freem(m);
4362                         return;
4363                 }
4364                 p_len += padval;
4365         }
4366         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4367         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4368             (struct sockaddr *)&net->ro._l_addr,
4369             m, 0, NULL, 0, 0, NULL, 0, net->port, so_locked, NULL);
4370         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4371         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4372         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4373         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4374 }
4375
4376 struct mbuf *
4377 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4378     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp)
4379 {
4380         /*
4381          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4382          * being equal to the beginning of the params i.e. (iphlen +
4383          * sizeof(struct sctp_init_msg) parse through the parameters to the
4384          * end of the mbuf verifying that all parameters are known.
4385          *
4386          * For unknown parameters build and return a mbuf with
4387          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4388          * processing this chunk stop, and set *abort_processing to 1.
4389          *
4390          * By having param_offset be pre-set to where parameters begin it is
4391          * hoped that this routine may be reused in the future by new
4392          * features.
4393          */
4394         struct sctp_paramhdr *phdr, params;
4395
4396         struct mbuf *mat, *op_err;
4397         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4398         int at, limit, pad_needed;
4399         uint16_t ptype, plen, padded_size;
4400         int err_at;
4401
4402         *abort_processing = 0;
4403         mat = in_initpkt;
4404         err_at = 0;
4405         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4406         at = param_offset;
4407         op_err = NULL;
4408         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4409         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4410         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4411                 ptype = ntohs(phdr->param_type);
4412                 plen = ntohs(phdr->param_length);
4413                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4414                         /* wacked parameter */
4415                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4416                         goto invalid_size;
4417                 }
4418                 limit -= SCTP_SIZE32(plen);
4419                 /*-
4420                  * All parameters for all chunks that we know/understand are
4421                  * listed here. We process them other places and make
4422                  * appropriate stop actions per the upper bits. However this
4423                  * is the generic routine processor's can call to get back
4424                  * an operr.. to either incorporate (init-ack) or send.
4425                  */
4426                 padded_size = SCTP_SIZE32(plen);
4427                 switch (ptype) {
4428                         /* Param's with variable size */
4429                 case SCTP_HEARTBEAT_INFO:
4430                 case SCTP_STATE_COOKIE:
4431                 case SCTP_UNRECOG_PARAM:
4432                 case SCTP_ERROR_CAUSE_IND:
4433                         /* ok skip fwd */
4434                         at += padded_size;
4435                         break;
4436                         /* Param's with variable size within a range */
4437                 case SCTP_CHUNK_LIST:
4438                 case SCTP_SUPPORTED_CHUNK_EXT:
4439                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4440                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4441                                 goto invalid_size;
4442                         }
4443                         at += padded_size;
4444                         break;
4445                 case SCTP_SUPPORTED_ADDRTYPE:
4446                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4447                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4448                                 goto invalid_size;
4449                         }
4450                         at += padded_size;
4451                         break;
4452                 case SCTP_RANDOM:
4453                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4454                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4455                                 goto invalid_size;
4456                         }
4457                         at += padded_size;
4458                         break;
4459                 case SCTP_SET_PRIM_ADDR:
4460                 case SCTP_DEL_IP_ADDRESS:
4461                 case SCTP_ADD_IP_ADDRESS:
4462                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4463                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4464                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4465                                 goto invalid_size;
4466                         }
4467                         at += padded_size;
4468                         break;
4469                         /* Param's with a fixed size */
4470                 case SCTP_IPV4_ADDRESS:
4471                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4472                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4473                                 goto invalid_size;
4474                         }
4475                         at += padded_size;
4476                         break;
4477                 case SCTP_IPV6_ADDRESS:
4478                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4479                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4480                                 goto invalid_size;
4481                         }
4482                         at += padded_size;
4483                         break;
4484                 case SCTP_COOKIE_PRESERVE:
4485                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4486                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4487                                 goto invalid_size;
4488                         }
4489                         at += padded_size;
4490                         break;
4491                 case SCTP_ECN_NONCE_SUPPORTED:
4492                 case SCTP_PRSCTP_SUPPORTED:
4493                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4494                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp %d\n", plen);
4495                                 goto invalid_size;
4496                         }
4497                         at += padded_size;
4498                         break;
4499                 case SCTP_ECN_CAPABLE:
4500                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4501                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4502                                 goto invalid_size;
4503                         }
4504                         at += padded_size;
4505                         break;
4506                 case SCTP_ULP_ADAPTATION:
4507                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4508                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4509                                 goto invalid_size;
4510                         }
4511                         at += padded_size;
4512                         break;
4513                 case SCTP_SUCCESS_REPORT:
4514                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4515                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4516                                 goto invalid_size;
4517                         }
4518                         at += padded_size;
4519                         break;
4520                 case SCTP_HOSTNAME_ADDRESS:
4521                         {
4522                                 /* We can NOT handle HOST NAME addresses!! */
4523                                 int l_len;
4524
4525                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4526                                 *abort_processing = 1;
4527                                 if (op_err == NULL) {
4528                                         /* Ok need to try to get a mbuf */
4529 #ifdef INET6
4530                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4531 #else
4532                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4533 #endif
4534                                         l_len += plen;
4535                                         l_len += sizeof(struct sctp_paramhdr);
4536                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4537                                         if (op_err) {
4538                                                 SCTP_BUF_LEN(op_err) = 0;
4539                                                 /*
4540                                                  * pre-reserve space for ip
4541                                                  * and sctp header  and
4542                                                  * chunk hdr
4543                                                  */
4544 #ifdef INET6
4545                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4546 #else
4547                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4548 #endif
4549                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4550                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4551                                         }
4552                                 }
4553                                 if (op_err) {
4554                                         /* If we have space */
4555                                         struct sctp_paramhdr s;
4556
4557                                         if (err_at % 4) {
4558                                                 uint32_t cpthis = 0;
4559
4560                                                 pad_needed = 4 - (err_at % 4);
4561                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4562                                                 err_at += pad_needed;
4563                                         }
4564                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4565                                         s.param_length = htons(sizeof(s) + plen);
4566                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4567                                         err_at += sizeof(s);
4568                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4569                                         if (phdr == NULL) {
4570                                                 sctp_m_freem(op_err);
4571                                                 /*
4572                                                  * we are out of memory but
4573                                                  * we still need to have a
4574                                                  * look at what to do (the
4575                                                  * system is in trouble
4576                                                  * though).
4577                                                  */
4578                                                 return (NULL);
4579                                         }
4580                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4581                                         err_at += plen;
4582                                 }
4583                                 return (op_err);
4584                                 break;
4585                         }
4586                 default:
4587                         /*
4588                          * we do not recognize the parameter figure out what
4589                          * we do.
4590                          */
4591                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4592                         if ((ptype & 0x4000) == 0x4000) {
4593                                 /* Report bit is set?? */
4594                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4595                                 if (op_err == NULL) {
4596                                         int l_len;
4597
4598                                         /* Ok need to try to get an mbuf */
4599 #ifdef INET6
4600                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4601 #else
4602                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4603 #endif
4604                                         l_len += plen;
4605                                         l_len += sizeof(struct sctp_paramhdr);
4606                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4607                                         if (op_err) {
4608                                                 SCTP_BUF_LEN(op_err) = 0;
4609 #ifdef INET6
4610                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4611 #else
4612                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4613 #endif
4614                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4615                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4616                                         }
4617                                 }
4618                                 if (op_err) {
4619                                         /* If we have space */
4620                                         struct sctp_paramhdr s;
4621
4622                                         if (err_at % 4) {
4623                                                 uint32_t cpthis = 0;
4624
4625                                                 pad_needed = 4 - (err_at % 4);
4626                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4627                                                 err_at += pad_needed;
4628                                         }
4629                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4630                                         s.param_length = htons(sizeof(s) + plen);
4631                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4632                                         err_at += sizeof(s);
4633                                         if (plen > sizeof(tempbuf)) {
4634                                                 plen = sizeof(tempbuf);
4635                                         }
4636                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4637                                         if (phdr == NULL) {
4638                                                 sctp_m_freem(op_err);
4639                                                 /*
4640                                                  * we are out of memory but
4641                                                  * we still need to have a
4642                                                  * look at what to do (the
4643                                                  * system is in trouble
4644                                                  * though).
4645                                                  */
4646                                                 op_err = NULL;
4647                                                 goto more_processing;
4648                                         }
4649                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4650                                         err_at += plen;
4651                                 }
4652                         }
4653         more_processing:
4654                         if ((ptype & 0x8000) == 0x0000) {
4655                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4656                                 return (op_err);
4657                         } else {
4658                                 /* skip this chunk and continue processing */
4659                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4660                                 at += SCTP_SIZE32(plen);
4661                         }
4662                         break;
4663
4664                 }
4665                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4666         }
4667         return (op_err);
4668 invalid_size:
4669         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4670         *abort_processing = 1;
4671         if ((op_err == NULL) && phdr) {
4672                 int l_len;
4673
4674 #ifdef INET6
4675                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4676 #else
4677                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4678 #endif
4679                 l_len += (2 * sizeof(struct sctp_paramhdr));
4680                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4681                 if (op_err) {
4682                         SCTP_BUF_LEN(op_err) = 0;
4683 #ifdef INET6
4684                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4685 #else
4686                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4687 #endif
4688                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4689                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4690                 }
4691         }
4692         if ((op_err) && phdr) {
4693                 struct sctp_paramhdr s;
4694
4695                 if (err_at % 4) {
4696                         uint32_t cpthis = 0;
4697
4698                         pad_needed = 4 - (err_at % 4);
4699                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4700                         err_at += pad_needed;
4701                 }
4702                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4703                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4704                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4705                 err_at += sizeof(s);
4706                 /* Only copy back the p-hdr that caused the issue */
4707                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4708         }
4709         return (op_err);
4710 }
4711
4712 static int
4713 sctp_are_there_new_addresses(struct sctp_association *asoc,
4714     struct mbuf *in_initpkt, int iphlen, int offset)
4715 {
4716         /*
4717          * Given a INIT packet, look through the packet to verify that there
4718          * are NO new addresses. As we go through the parameters add reports
4719          * of any un-understood parameters that require an error.  Also we
4720          * must return (1) to drop the packet if we see a un-understood
4721          * parameter that tells us to drop the chunk.
4722          */
4723         struct sockaddr_in sin4, *sa4;
4724
4725 #ifdef INET6
4726         struct sockaddr_in6 sin6, *sa6;
4727
4728 #endif
4729         struct sockaddr *sa_touse;
4730         struct sockaddr *sa;
4731         struct sctp_paramhdr *phdr, params;
4732         struct ip *iph;
4733
4734 #ifdef INET6
4735         struct ip6_hdr *ip6h;
4736
4737 #endif
4738         struct mbuf *mat;
4739         uint16_t ptype, plen;
4740         int err_at;
4741         uint8_t fnd;
4742         struct sctp_nets *net;
4743
4744         memset(&sin4, 0, sizeof(sin4));
4745 #ifdef INET6
4746         memset(&sin6, 0, sizeof(sin6));
4747 #endif
4748         sin4.sin_family = AF_INET;
4749         sin4.sin_len = sizeof(sin4);
4750 #ifdef INET6
4751         sin6.sin6_family = AF_INET6;
4752         sin6.sin6_len = sizeof(sin6);
4753 #endif
4754         sa_touse = NULL;
4755         /* First what about the src address of the pkt ? */
4756         iph = mtod(in_initpkt, struct ip *);
4757         switch (iph->ip_v) {
4758         case IPVERSION:
4759                 /* source addr is IPv4 */
4760                 sin4.sin_addr = iph->ip_src;
4761                 sa_touse = (struct sockaddr *)&sin4;
4762                 break;
4763 #ifdef INET6
4764         case IPV6_VERSION >> 4:
4765                 /* source addr is IPv6 */
4766                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4767                 sin6.sin6_addr = ip6h->ip6_src;
4768                 sa_touse = (struct sockaddr *)&sin6;
4769                 break;
4770 #endif
4771         default:
4772                 return (1);
4773         }
4774
4775         fnd = 0;
4776         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4777                 sa = (struct sockaddr *)&net->ro._l_addr;
4778                 if (sa->sa_family == sa_touse->sa_family) {
4779                         if (sa->sa_family == AF_INET) {
4780                                 sa4 = (struct sockaddr_in *)sa;
4781                                 if (sa4->sin_addr.s_addr ==
4782                                     sin4.sin_addr.s_addr) {
4783                                         fnd = 1;
4784                                         break;
4785                                 }
4786                         }
4787 #ifdef INET6
4788                         if (sa->sa_family == AF_INET6) {
4789                                 sa6 = (struct sockaddr_in6 *)sa;
4790                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4791                                     &sin6)) {
4792                                         fnd = 1;
4793                                         break;
4794                                 }
4795                         }
4796 #endif
4797                 }
4798         }
4799         if (fnd == 0) {
4800                 /* New address added! no need to look futher. */
4801                 return (1);
4802         }
4803         /* Ok so far lets munge through the rest of the packet */
4804         mat = in_initpkt;
4805         err_at = 0;
4806         sa_touse = NULL;
4807         offset += sizeof(struct sctp_init_chunk);
4808         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4809         while (phdr) {
4810                 ptype = ntohs(phdr->param_type);
4811                 plen = ntohs(phdr->param_length);
4812                 if (ptype == SCTP_IPV4_ADDRESS) {
4813                         struct sctp_ipv4addr_param *p4, p4_buf;
4814
4815                         phdr = sctp_get_next_param(mat, offset,
4816                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4817                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4818                             phdr == NULL) {
4819                                 return (1);
4820                         }
4821                         p4 = (struct sctp_ipv4addr_param *)phdr;
4822                         sin4.sin_addr.s_addr = p4->addr;
4823                         sa_touse = (struct sockaddr *)&sin4;
4824                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4825                         struct sctp_ipv6addr_param *p6, p6_buf;
4826
4827                         phdr = sctp_get_next_param(mat, offset,
4828                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4829                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4830                             phdr == NULL) {
4831                                 return (1);
4832                         }
4833                         p6 = (struct sctp_ipv6addr_param *)phdr;
4834 #ifdef INET6
4835                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4836                             sizeof(p6->addr));
4837 #endif
4838                         sa_touse = (struct sockaddr *)&sin4;
4839                 }
4840                 if (sa_touse) {
4841                         /* ok, sa_touse points to one to check */
4842                         fnd = 0;
4843                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4844                                 sa = (struct sockaddr *)&net->ro._l_addr;
4845                                 if (sa->sa_family != sa_touse->sa_family) {
4846                                         continue;
4847                                 }
4848                                 if (sa->sa_family == AF_INET) {
4849                                         sa4 = (struct sockaddr_in *)sa;
4850                                         if (sa4->sin_addr.s_addr ==
4851                                             sin4.sin_addr.s_addr) {
4852                                                 fnd = 1;
4853                                                 break;
4854                                         }
4855                                 }
4856 #ifdef INET6
4857                                 if (sa->sa_family == AF_INET6) {
4858                                         sa6 = (struct sockaddr_in6 *)sa;
4859                                         if (SCTP6_ARE_ADDR_EQUAL(
4860                                             sa6, &sin6)) {
4861                                                 fnd = 1;
4862                                                 break;
4863                                         }
4864                                 }
4865 #endif
4866                         }
4867                         if (!fnd) {
4868                                 /* New addr added! no need to look further */
4869                                 return (1);
4870                         }
4871                 }
4872                 offset += SCTP_SIZE32(plen);
4873                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4874         }
4875         return (0);
4876 }
4877
4878 /*
4879  * Given a MBUF chain that was sent into us containing an INIT. Build a
4880  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4881  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4882  * message (i.e. the struct sctp_init_msg).
4883  */
4884 void
4885 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4886     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4887     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4888 {
4889         struct sctp_association *asoc;
4890         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4891         struct sctp_init_msg *initackm_out;
4892         struct sctp_ecn_supported_param *ecn;
4893         struct sctp_prsctp_supported_param *prsctp;
4894         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4895         struct sctp_supported_chunk_types_param *pr_supported;
4896         union sctp_sockstore store, store1, *over_addr;
4897         struct sockaddr_in *sin, *to_sin;
4898
4899 #ifdef INET6
4900         struct sockaddr_in6 *sin6, *to_sin6;
4901
4902 #endif
4903         struct ip *iph;
4904
4905 #ifdef INET6
4906         struct ip6_hdr *ip6;
4907
4908 #endif
4909         struct sockaddr *to;
4910         struct sctp_state_cookie stc;
4911         struct sctp_nets *net = NULL;
4912         uint8_t *signature = NULL;
4913         int cnt_inits_to = 0;
4914         uint16_t his_limit, i_want;
4915         int abort_flag, padval;
4916         int num_ext;
4917         int p_len;
4918         struct socket *so;
4919
4920         if (stcb)
4921                 asoc = &stcb->asoc;
4922         else
4923                 asoc = NULL;
4924         mp_last = NULL;
4925         if ((asoc != NULL) &&
4926             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4927             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4928                 /* new addresses, out of here in non-cookie-wait states */
4929                 /*
4930                  * Send a ABORT, we don't add the new address error clause
4931                  * though we even set the T bit and copy in the 0 tag.. this
4932                  * looks no different than if no listener was present.
4933                  */
4934                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
4935                 return;
4936         }
4937         abort_flag = 0;
4938         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4939             (offset + sizeof(struct sctp_init_chunk)),
4940             &abort_flag, (struct sctp_chunkhdr *)init_chk);
4941         if (abort_flag) {
4942 do_a_abort:
4943                 sctp_send_abort(init_pkt, iphlen, sh,
4944                     init_chk->init.initiate_tag, op_err, vrf_id, port);
4945                 return;
4946         }
4947         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4948         if (m == NULL) {
4949                 /* No memory, INIT timer will re-attempt. */
4950                 if (op_err)
4951                         sctp_m_freem(op_err);
4952                 return;
4953         }
4954         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
4955
4956         /* the time I built cookie */
4957         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
4958
4959         /* populate any tie tags */
4960         if (asoc != NULL) {
4961                 /* unlock before tag selections */
4962                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
4963                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
4964                 stc.cookie_life = asoc->cookie_life;
4965                 net = asoc->primary_destination;
4966         } else {
4967                 stc.tie_tag_my_vtag = 0;
4968                 stc.tie_tag_peer_vtag = 0;
4969                 /* life I will award this cookie */
4970                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
4971         }
4972
4973         /* copy in the ports for later check */
4974         stc.myport = sh->dest_port;
4975         stc.peerport = sh->src_port;
4976
4977         /*
4978          * If we wanted to honor cookie life extentions, we would add to
4979          * stc.cookie_life. For now we should NOT honor any extension
4980          */
4981         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
4982         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
4983                 struct inpcb *in_inp;
4984
4985                 /* Its a V6 socket */
4986                 in_inp = (struct inpcb *)inp;
4987                 stc.ipv6_addr_legal = 1;
4988                 /* Now look at the binding flag to see if V4 will be legal */
4989                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
4990                         stc.ipv4_addr_legal = 1;
4991                 } else {
4992                         /* V4 addresses are NOT legal on the association */
4993                         stc.ipv4_addr_legal = 0;
4994                 }
4995         } else {
4996                 /* Its a V4 socket, no - V6 */
4997                 stc.ipv4_addr_legal = 1;
4998                 stc.ipv6_addr_legal = 0;
4999         }
5000
5001 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5002         stc.ipv4_scope = 1;
5003 #else
5004         stc.ipv4_scope = 0;
5005 #endif
5006         /* now for scope setup */
5007         memset((caddr_t)&store, 0, sizeof(store));
5008         memset((caddr_t)&store1, 0, sizeof(store1));
5009         sin = &store.sin;
5010         to_sin = &store1.sin;
5011 #ifdef INET6
5012         sin6 = &store.sin6;
5013         to_sin6 = &store1.sin6;
5014 #endif
5015         iph = mtod(init_pkt, struct ip *);
5016         /* establish the to_addr's */
5017         switch (iph->ip_v) {
5018         case IPVERSION:
5019                 to_sin->sin_port = sh->dest_port;
5020                 to_sin->sin_family = AF_INET;
5021                 to_sin->sin_len = sizeof(struct sockaddr_in);
5022                 to_sin->sin_addr = iph->ip_dst;
5023                 break;
5024 #ifdef INET6
5025         case IPV6_VERSION >> 4:
5026                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5027                 to_sin6->sin6_addr = ip6->ip6_dst;
5028                 to_sin6->sin6_scope_id = 0;
5029                 to_sin6->sin6_port = sh->dest_port;
5030                 to_sin6->sin6_family = AF_INET6;
5031                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5032                 break;
5033 #endif
5034         default:
5035                 goto do_a_abort;
5036                 break;
5037         };
5038
5039         if (net == NULL) {
5040                 to = (struct sockaddr *)&store;
5041                 switch (iph->ip_v) {
5042                 case IPVERSION:
5043                         {
5044                                 sin->sin_family = AF_INET;
5045                                 sin->sin_len = sizeof(struct sockaddr_in);
5046                                 sin->sin_port = sh->src_port;
5047                                 sin->sin_addr = iph->ip_src;
5048                                 /* lookup address */
5049                                 stc.address[0] = sin->sin_addr.s_addr;
5050                                 stc.address[1] = 0;
5051                                 stc.address[2] = 0;
5052                                 stc.address[3] = 0;
5053                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5054                                 /* local from address */
5055                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5056                                 stc.laddress[1] = 0;
5057                                 stc.laddress[2] = 0;
5058                                 stc.laddress[3] = 0;
5059                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5060                                 /* scope_id is only for v6 */
5061                                 stc.scope_id = 0;
5062 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5063                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5064                                         stc.ipv4_scope = 1;
5065                                 }
5066 #else
5067                                 stc.ipv4_scope = 1;
5068 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5069                                 /* Must use the address in this case */
5070                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5071                                         stc.loopback_scope = 1;
5072                                         stc.ipv4_scope = 1;
5073                                         stc.site_scope = 1;
5074                                         stc.local_scope = 0;
5075                                 }
5076                                 break;
5077                         }
5078 #ifdef INET6
5079                 case IPV6_VERSION >> 4:
5080                         {
5081                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5082                                 sin6->sin6_family = AF_INET6;
5083                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5084                                 sin6->sin6_port = sh->src_port;
5085                                 sin6->sin6_addr = ip6->ip6_src;
5086                                 /* lookup address */
5087                                 memcpy(&stc.address, &sin6->sin6_addr,
5088                                     sizeof(struct in6_addr));
5089                                 sin6->sin6_scope_id = 0;
5090                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5091                                 stc.scope_id = 0;
5092                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5093                                         /*
5094                                          * FIX ME: does this have scope from
5095                                          * rcvif?
5096                                          */
5097                                         (void)sa6_recoverscope(sin6);
5098                                         stc.scope_id = sin6->sin6_scope_id;
5099                                         sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone));
5100                                         stc.loopback_scope = 1;
5101                                         stc.local_scope = 0;
5102                                         stc.site_scope = 1;
5103                                         stc.ipv4_scope = 1;
5104                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5105                                         /*
5106                                          * If the new destination is a
5107                                          * LINK_LOCAL we must have common
5108                                          * both site and local scope. Don't
5109                                          * set local scope though since we
5110                                          * must depend on the source to be
5111                                          * added implicitly. We cannot
5112                                          * assure just because we share one
5113                                          * link that all links are common.
5114                                          */
5115                                         stc.local_scope = 0;
5116                                         stc.site_scope = 1;
5117                                         stc.ipv4_scope = 1;
5118                                         /*
5119                                          * we start counting for the private
5120                                          * address stuff at 1. since the
5121                                          * link local we source from won't
5122                                          * show up in our scoped count.
5123                                          */
5124                                         cnt_inits_to = 1;
5125                                         /*
5126                                          * pull out the scope_id from
5127                                          * incoming pkt
5128                                          */
5129                                         /*
5130                                          * FIX ME: does this have scope from
5131                                          * rcvif?
5132                                          */
5133                                         (void)sa6_recoverscope(sin6);
5134                                         stc.scope_id = sin6->sin6_scope_id;
5135                                         sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone));
5136                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5137                                         /*
5138                                          * If the new destination is
5139                                          * SITE_LOCAL then we must have site
5140                                          * scope in common.
5141                                          */
5142                                         stc.site_scope = 1;
5143                                 }
5144                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5145                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5146                                 break;
5147                         }
5148 #endif
5149                 default:
5150                         /* TSNH */
5151                         goto do_a_abort;
5152                         break;
5153                 }
5154         } else {
5155                 /* set the scope per the existing tcb */
5156
5157 #ifdef INET6
5158                 struct sctp_nets *lnet;
5159
5160 #endif
5161
5162                 stc.loopback_scope = asoc->loopback_scope;
5163                 stc.ipv4_scope = asoc->ipv4_local_scope;
5164                 stc.site_scope = asoc->site_scope;
5165                 stc.local_scope = asoc->local_scope;
5166 #ifdef INET6
5167                 /* Why do we not consider IPv4 LL addresses? */
5168                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5169                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5170                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5171                                         /*
5172                                          * if we have a LL address, start
5173                                          * counting at 1.
5174                                          */
5175                                         cnt_inits_to = 1;
5176                                 }
5177                         }
5178                 }
5179 #endif
5180                 /* use the net pointer */
5181                 to = (struct sockaddr *)&net->ro._l_addr;
5182                 switch (to->sa_family) {
5183                 case AF_INET:
5184                         sin = (struct sockaddr_in *)to;
5185                         stc.address[0] = sin->sin_addr.s_addr;
5186                         stc.address[1] = 0;
5187                         stc.address[2] = 0;
5188                         stc.address[3] = 0;
5189                         stc.addr_type = SCTP_IPV4_ADDRESS;
5190                         if (net->src_addr_selected == 0) {
5191                                 /*
5192                                  * strange case here, the INIT should have
5193                                  * did the selection.
5194                                  */
5195                                 net->ro._s_addr = sctp_source_address_selection(inp,
5196                                     stcb, (sctp_route_t *) & net->ro,
5197                                     net, 0, vrf_id);
5198                                 if (net->ro._s_addr == NULL)
5199                                         return;
5200
5201                                 net->src_addr_selected = 1;
5202
5203                         }
5204                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5205                         stc.laddress[1] = 0;
5206                         stc.laddress[2] = 0;
5207                         stc.laddress[3] = 0;
5208                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5209                         break;
5210 #ifdef INET6
5211                 case AF_INET6:
5212                         sin6 = (struct sockaddr_in6 *)to;
5213                         memcpy(&stc.address, &sin6->sin6_addr,
5214                             sizeof(struct in6_addr));
5215                         stc.addr_type = SCTP_IPV6_ADDRESS;
5216                         if (net->src_addr_selected == 0) {
5217                                 /*
5218                                  * strange case here, the INIT should have
5219                                  * did the selection.
5220                                  */
5221                                 net->ro._s_addr = sctp_source_address_selection(inp,
5222                                     stcb, (sctp_route_t *) & net->ro,
5223                                     net, 0, vrf_id);
5224                                 if (net->ro._s_addr == NULL)
5225                                         return;
5226
5227                                 net->src_addr_selected = 1;
5228                         }
5229                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5230                             sizeof(struct in6_addr));
5231                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5232                         break;
5233 #endif
5234                 }
5235         }
5236         /* Now lets put the SCTP header in place */
5237         initackm_out = mtod(m, struct sctp_init_msg *);
5238         initackm_out->sh.src_port = inp->sctp_lport;
5239         initackm_out->sh.dest_port = sh->src_port;
5240         initackm_out->sh.v_tag = init_chk->init.initiate_tag;
5241         /* Save it off for quick ref */
5242         stc.peers_vtag = init_chk->init.initiate_tag;
5243         initackm_out->sh.checksum = 0;  /* calculate later */
5244         /* who are we */
5245         memcpy(stc.identification, SCTP_VERSION_STRING,
5246             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5247         /* now the chunk header */
5248         initackm_out->msg.ch.chunk_type = SCTP_INITIATION_ACK;
5249         initackm_out->msg.ch.chunk_flags = 0;
5250         /* fill in later from mbuf we build */
5251         initackm_out->msg.ch.chunk_length = 0;
5252         /* place in my tag */
5253         if ((asoc != NULL) &&
5254             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5255             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5256             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5257                 /* re-use the v-tags and init-seq here */
5258                 initackm_out->msg.init.initiate_tag = htonl(asoc->my_vtag);
5259                 initackm_out->msg.init.initial_tsn = htonl(asoc->init_seq_number);
5260         } else {
5261                 uint32_t vtag, itsn;
5262
5263                 if (hold_inp_lock) {
5264                         SCTP_INP_INCR_REF(inp);
5265                         SCTP_INP_RUNLOCK(inp);
5266                 }
5267                 if (asoc) {
5268                         atomic_add_int(&asoc->refcnt, 1);
5269                         SCTP_TCB_UNLOCK(stcb);
5270                         vtag = sctp_select_a_tag(inp, 1);
5271                         initackm_out->msg.init.initiate_tag = htonl(vtag);
5272                         /* get a TSN to use too */
5273                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5274                         initackm_out->msg.init.initial_tsn = htonl(itsn);
5275                         SCTP_TCB_LOCK(stcb);
5276                         atomic_add_int(&asoc->refcnt, -1);
5277                 } else {
5278                         vtag = sctp_select_a_tag(inp, 1);
5279                         initackm_out->msg.init.initiate_tag = htonl(vtag);
5280                         /* get a TSN to use too */
5281                         initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5282                 }
5283                 if (hold_inp_lock) {
5284                         SCTP_INP_RLOCK(inp);
5285                         SCTP_INP_DECR_REF(inp);
5286                 }
5287         }
5288         /* save away my tag to */
5289         stc.my_vtag = initackm_out->msg.init.initiate_tag;
5290
5291         /* set up some of the credits. */
5292         so = inp->sctp_socket;
5293         if (so == NULL) {
5294                 /* memory problem */
5295                 sctp_m_freem(m);
5296                 return;
5297         } else {
5298                 initackm_out->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5299         }
5300         /* set what I want */
5301         his_limit = ntohs(init_chk->init.num_inbound_streams);
5302         /* choose what I want */
5303         if (asoc != NULL) {
5304                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5305                         i_want = asoc->streamoutcnt;
5306                 } else {
5307                         i_want = inp->sctp_ep.pre_open_stream_count;
5308                 }
5309         } else {
5310                 i_want = inp->sctp_ep.pre_open_stream_count;
5311         }
5312         if (his_limit < i_want) {
5313                 /* I Want more :< */
5314                 initackm_out->msg.init.num_outbound_streams = init_chk->init.num_inbound_streams;
5315         } else {
5316                 /* I can have what I want :> */
5317                 initackm_out->msg.init.num_outbound_streams = htons(i_want);
5318         }
5319         /* tell him his limt. */
5320         initackm_out->msg.init.num_inbound_streams =
5321             htons(inp->sctp_ep.max_open_streams_intome);
5322         /* setup the ECN pointer */
5323
5324         if (inp->sctp_ep.adaptation_layer_indicator) {
5325                 struct sctp_adaptation_layer_indication *ali;
5326
5327                 ali = (struct sctp_adaptation_layer_indication *)(
5328                     (caddr_t)initackm_out + sizeof(*initackm_out));
5329                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5330                 ali->ph.param_length = htons(sizeof(*ali));
5331                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5332                 SCTP_BUF_LEN(m) += sizeof(*ali);
5333                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
5334                     sizeof(*ali));
5335         } else {
5336                 ecn = (struct sctp_ecn_supported_param *)(
5337                     (caddr_t)initackm_out + sizeof(*initackm_out));
5338         }
5339
5340         /* ECN parameter */
5341         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5342                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5343                 ecn->ph.param_length = htons(sizeof(*ecn));
5344                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5345
5346                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5347                     sizeof(*ecn));
5348         } else {
5349                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5350         }
5351         /* And now tell the peer we do  pr-sctp */
5352         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5353         prsctp->ph.param_length = htons(sizeof(*prsctp));
5354         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5355
5356         /* And now tell the peer we do all the extensions */
5357         pr_supported = (struct sctp_supported_chunk_types_param *)
5358             ((caddr_t)prsctp + sizeof(*prsctp));
5359
5360         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5361         num_ext = 0;
5362         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5363         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5364         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5365         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5366         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5367         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5368                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5369         p_len = sizeof(*pr_supported) + num_ext;
5370         pr_supported->ph.param_length = htons(p_len);
5371         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5372         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5373
5374         /* ECN nonce: And now tell the peer we support ECN nonce */
5375         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5376                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5377                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5378                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5379                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5380                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5381         }
5382         /* add authentication parameters */
5383         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5384                 struct sctp_auth_random *randp;
5385                 struct sctp_auth_hmac_algo *hmacs;
5386                 struct sctp_auth_chunk_list *chunks;
5387                 uint16_t random_len;
5388
5389                 /* generate and add RANDOM parameter */
5390                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5391                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5392                 randp->ph.param_type = htons(SCTP_RANDOM);
5393                 p_len = sizeof(*randp) + random_len;
5394                 randp->ph.param_length = htons(p_len);
5395                 SCTP_READ_RANDOM(randp->random_data, random_len);
5396                 /* zero out any padding required */
5397                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5398                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5399
5400                 /* add HMAC_ALGO parameter */
5401                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5402                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5403                     (uint8_t *) hmacs->hmac_ids);
5404                 if (p_len > 0) {
5405                         p_len += sizeof(*hmacs);
5406                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5407                         hmacs->ph.param_length = htons(p_len);
5408                         /* zero out any padding required */
5409                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5410                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5411                 }
5412                 /* add CHUNKS parameter */
5413                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5414                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5415                     chunks->chunk_types);
5416                 if (p_len > 0) {
5417                         p_len += sizeof(*chunks);
5418                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5419                         chunks->ph.param_length = htons(p_len);
5420                         /* zero out any padding required */
5421                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5422                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5423                 }
5424         }
5425         m_at = m;
5426         /* now the addresses */
5427         {
5428                 struct sctp_scoping scp;
5429
5430                 /*
5431                  * To optimize this we could put the scoping stuff into a
5432                  * structure and remove the individual uint8's from the stc
5433                  * structure. Then we could just sifa in the address within
5434                  * the stc.. but for now this is a quick hack to get the
5435                  * address stuff teased apart.
5436                  */
5437                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5438                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5439                 scp.loopback_scope = stc.loopback_scope;
5440                 scp.ipv4_local_scope = stc.ipv4_scope;
5441                 scp.local_scope = stc.local_scope;
5442                 scp.site_scope = stc.site_scope;
5443                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5444         }
5445
5446         /* tack on the operational error if present */
5447         if (op_err) {
5448                 struct mbuf *ol;
5449                 int llen;
5450
5451                 llen = 0;
5452                 ol = op_err;
5453                 while (ol) {
5454                         llen += SCTP_BUF_LEN(ol);
5455                         ol = SCTP_BUF_NEXT(ol);
5456                 }
5457                 if (llen % 4) {
5458                         /* must add a pad to the param */
5459                         uint32_t cpthis = 0;
5460                         int padlen;
5461
5462                         padlen = 4 - (llen % 4);
5463                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5464                 }
5465                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5466                         m_at = SCTP_BUF_NEXT(m_at);
5467                 }
5468                 SCTP_BUF_NEXT(m_at) = op_err;
5469                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5470                         m_at = SCTP_BUF_NEXT(m_at);
5471                 }
5472         }
5473         /* pre-calulate the size and update pkt header and chunk header */
5474         p_len = 0;
5475         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5476                 p_len += SCTP_BUF_LEN(m_tmp);
5477                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5478                         /* m_tmp should now point to last one */
5479                         break;
5480                 }
5481         }
5482
5483         /* Now we must build a cookie */
5484         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m,
5485             sizeof(struct sctphdr), &stc, &signature);
5486         if (m_cookie == NULL) {
5487                 /* memory problem */
5488                 sctp_m_freem(m);
5489                 return;
5490         }
5491         /* Now append the cookie to the end and update the space/size */
5492         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5493
5494         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5495                 p_len += SCTP_BUF_LEN(m_tmp);
5496                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5497                         /* m_tmp should now point to last one */
5498                         mp_last = m_tmp;
5499                         break;
5500                 }
5501         }
5502         /*
5503          * Place in the size, but we don't include the last pad (if any) in
5504          * the INIT-ACK.
5505          */
5506         initackm_out->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
5507
5508         /*
5509          * Time to sign the cookie, we don't sign over the cookie signature
5510          * though thus we set trailer.
5511          */
5512         (void)sctp_hmac_m(SCTP_HMAC,
5513             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5514             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5515             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5516         /*
5517          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5518          * here since the timer will drive a retranmission.
5519          */
5520         padval = p_len % 4;
5521         if ((padval) && (mp_last)) {
5522                 /* see my previous comments on mp_last */
5523                 int ret;
5524
5525                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5526                 if (ret) {
5527                         /* Houston we have a problem, no space */
5528                         sctp_m_freem(m);
5529                         return;
5530                 }
5531                 p_len += padval;
5532         }
5533         if (stc.loopback_scope) {
5534                 over_addr = &store1;
5535         } else {
5536                 over_addr = NULL;
5537
5538         }
5539
5540         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5541             NULL, 0, port, SCTP_SO_NOT_LOCKED, over_addr);
5542         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5543 }
5544
5545
5546 void
5547 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5548     struct sctp_association *asoc,
5549     struct sctp_stream_out *strq, int holds_lock)
5550 {
5551         struct sctp_stream_out *stre, *strn;
5552
5553         if (holds_lock == 0) {
5554                 SCTP_TCB_SEND_LOCK(stcb);
5555         }
5556         if ((strq->next_spoke.tqe_next) ||
5557             (strq->next_spoke.tqe_prev)) {
5558                 /* already on wheel */
5559                 goto outof_here;
5560         }
5561         stre = TAILQ_FIRST(&asoc->out_wheel);
5562         if (stre == NULL) {
5563                 /* only one on wheel */
5564                 TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
5565                 goto outof_here;
5566         }
5567         for (; stre; stre = strn) {
5568                 strn = TAILQ_NEXT(stre, next_spoke);
5569                 if (stre->stream_no > strq->stream_no) {
5570                         TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
5571                         goto outof_here;
5572                 } else if (stre->stream_no == strq->stream_no) {
5573                         /* huh, should not happen */
5574                         goto outof_here;
5575                 } else if (strn == NULL) {
5576                         /* next one is null */
5577                         TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
5578                             next_spoke);
5579                 }
5580         }
5581 outof_here:
5582         if (holds_lock == 0) {
5583                 SCTP_TCB_SEND_UNLOCK(stcb);
5584         }
5585 }
5586
5587 static void
5588 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5589     struct sctp_association *asoc,
5590     struct sctp_stream_out *strq)
5591 {
5592         /* take off and then setup so we know it is not on the wheel */
5593         SCTP_TCB_SEND_LOCK(stcb);
5594         if (TAILQ_FIRST(&strq->outqueue)) {
5595                 /* more was added */
5596                 SCTP_TCB_SEND_UNLOCK(stcb);
5597                 return;
5598         }
5599         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5600         strq->next_spoke.tqe_next = NULL;
5601         strq->next_spoke.tqe_prev = NULL;
5602         SCTP_TCB_SEND_UNLOCK(stcb);
5603 }
5604
5605 static void
5606 sctp_prune_prsctp(struct sctp_tcb *stcb,
5607     struct sctp_association *asoc,
5608     struct sctp_sndrcvinfo *srcv,
5609     int dataout)
5610 {
5611         int freed_spc = 0;
5612         struct sctp_tmit_chunk *chk, *nchk;
5613
5614         SCTP_TCB_LOCK_ASSERT(stcb);
5615         if ((asoc->peer_supports_prsctp) &&
5616             (asoc->sent_queue_cnt_removeable > 0)) {
5617                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5618                         /*
5619                          * Look for chunks marked with the PR_SCTP flag AND
5620                          * the buffer space flag. If the one being sent is
5621                          * equal or greater priority then purge the old one
5622                          * and free some space.
5623                          */
5624                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5625                                 /*
5626                                  * This one is PR-SCTP AND buffer space
5627                                  * limited type
5628                                  */
5629                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5630                                         /*
5631                                          * Lower numbers equates to higher
5632                                          * priority so if the one we are
5633                                          * looking at has a larger or equal
5634                                          * priority we want to drop the data
5635                                          * and NOT retransmit it.
5636                                          */
5637                                         if (chk->data) {
5638                                                 /*
5639                                                  * We release the book_size
5640                                                  * if the mbuf is here
5641                                                  */
5642                                                 int ret_spc;
5643                                                 int cause;
5644
5645                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5646                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5647                                                 else
5648                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5649                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5650                                                     cause,
5651                                                     &asoc->sent_queue, SCTP_SO_LOCKED);
5652                                                 freed_spc += ret_spc;
5653                                                 if (freed_spc >= dataout) {
5654                                                         return;
5655                                                 }
5656                                         }       /* if chunk was present */
5657                                 }       /* if of sufficent priority */
5658                         }       /* if chunk has enabled */
5659                 }               /* tailqforeach */
5660
5661                 chk = TAILQ_FIRST(&asoc->send_queue);
5662                 while (chk) {
5663                         nchk = TAILQ_NEXT(chk, sctp_next);
5664                         /* Here we must move to the sent queue and mark */
5665                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5666                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5667                                         if (chk->data) {
5668                                                 /*
5669                                                  * We release the book_size
5670                                                  * if the mbuf is here
5671                                                  */
5672                                                 int ret_spc;
5673
5674                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5675                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5676                                                     &asoc->send_queue, SCTP_SO_LOCKED);
5677
5678                                                 freed_spc += ret_spc;
5679                                                 if (freed_spc >= dataout) {
5680                                                         return;
5681                                                 }
5682                                         }       /* end if chk->data */
5683                                 }       /* end if right class */
5684                         }       /* end if chk pr-sctp */
5685                         chk = nchk;
5686                 }               /* end while (chk) */
5687         }                       /* if enabled in asoc */
5688 }
5689
5690 int
5691 sctp_get_frag_point(struct sctp_tcb *stcb,
5692     struct sctp_association *asoc)
5693 {
5694         int siz, ovh;
5695
5696         /*
5697          * For endpoints that have both v6 and v4 addresses we must reserve
5698          * room for the ipv6 header, for those that are only dealing with V4
5699          * we use a larger frag point.
5700          */
5701         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5702                 ovh = SCTP_MED_OVERHEAD;
5703         } else {
5704                 ovh = SCTP_MED_V4_OVERHEAD;
5705         }
5706
5707         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5708                 siz = asoc->smallest_mtu - ovh;
5709         else
5710                 siz = (stcb->asoc.sctp_frag_point - ovh);
5711         /*
5712          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5713          */
5714         /* A data chunk MUST fit in a cluster */
5715         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5716         /* } */
5717
5718         /* adjust for an AUTH chunk if DATA requires auth */
5719         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5720                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5721
5722         if (siz % 4) {
5723                 /* make it an even word boundary please */
5724                 siz -= (siz % 4);
5725         }
5726         return (siz);
5727 }
5728
5729 static void
5730 sctp_set_prsctp_policy(struct sctp_tcb *stcb,
5731     struct sctp_stream_queue_pending *sp)
5732 {
5733         sp->pr_sctp_on = 0;
5734         if (stcb->asoc.peer_supports_prsctp) {
5735                 /*
5736                  * We assume that the user wants PR_SCTP_TTL if the user
5737                  * provides a positive lifetime but does not specify any
5738                  * PR_SCTP policy. This is a BAD assumption and causes
5739                  * problems at least with the U-Vancovers MPI folks. I will
5740                  * change this to be no policy means NO PR-SCTP.
5741                  */
5742                 if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5743                         sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5744                         sp->pr_sctp_on = 1;
5745                 } else {
5746                         return;
5747                 }
5748                 switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5749                 case CHUNK_FLAGS_PR_SCTP_BUF:
5750                         /*
5751                          * Time to live is a priority stored in tv_sec when
5752                          * doing the buffer drop thing.
5753                          */
5754                         sp->ts.tv_sec = sp->timetolive;
5755                         sp->ts.tv_usec = 0;
5756                         break;
5757                 case CHUNK_FLAGS_PR_SCTP_TTL:
5758                         {
5759                                 struct timeval tv;
5760
5761                                 (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5762                                 tv.tv_sec = sp->timetolive / 1000;
5763                                 tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5764                                 /*
5765                                  * TODO sctp_constants.h needs alternative
5766                                  * time macros when _KERNEL is undefined.
5767                                  */
5768                                 timevaladd(&sp->ts, &tv);
5769                         }
5770                         break;
5771                 case CHUNK_FLAGS_PR_SCTP_RTX:
5772                         /*
5773                          * Time to live is a the number or retransmissions
5774                          * stored in tv_sec.
5775                          */
5776                         sp->ts.tv_sec = sp->timetolive;
5777                         sp->ts.tv_usec = 0;
5778                         break;
5779                 default:
5780                         SCTPDBG(SCTP_DEBUG_USRREQ1,
5781                             "Unknown PR_SCTP policy %u.\n",
5782                             PR_SCTP_POLICY(sp->sinfo_flags));
5783                         break;
5784                 }
5785         }
5786 }
5787
5788 static int
5789 sctp_msg_append(struct sctp_tcb *stcb,
5790     struct sctp_nets *net,
5791     struct mbuf *m,
5792     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5793 {
5794         int error = 0, holds_lock;
5795         struct mbuf *at;
5796         struct sctp_stream_queue_pending *sp = NULL;
5797         struct sctp_stream_out *strm;
5798
5799         /*
5800          * Given an mbuf chain, put it into the association send queue and
5801          * place it on the wheel
5802          */
5803         holds_lock = hold_stcb_lock;
5804         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5805                 /* Invalid stream number */
5806                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5807                 error = EINVAL;
5808                 goto out_now;
5809         }
5810         if ((stcb->asoc.stream_locked) &&
5811             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5812                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5813                 error = EINVAL;
5814                 goto out_now;
5815         }
5816         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5817         /* Now can we send this? */
5818         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5819             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5820             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5821             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5822                 /* got data while shutting down */
5823                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5824                 error = ECONNRESET;
5825                 goto out_now;
5826         }
5827         sctp_alloc_a_strmoq(stcb, sp);
5828         if (sp == NULL) {
5829                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5830                 error = ENOMEM;
5831                 goto out_now;
5832         }
5833         sp->sinfo_flags = srcv->sinfo_flags;
5834         sp->timetolive = srcv->sinfo_timetolive;
5835         sp->ppid = srcv->sinfo_ppid;
5836         sp->context = srcv->sinfo_context;
5837         sp->strseq = 0;
5838         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5839                 sp->net = net;
5840                 sp->addr_over = 1;
5841         } else {
5842                 sp->net = stcb->asoc.primary_destination;
5843                 sp->addr_over = 0;
5844         }
5845         atomic_add_int(&sp->net->ref_count, 1);
5846         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5847         sp->stream = srcv->sinfo_stream;
5848         sp->msg_is_complete = 1;
5849         sp->sender_all_done = 1;
5850         sp->some_taken = 0;
5851         sp->data = m;
5852         sp->tail_mbuf = NULL;
5853         sp->length = 0;
5854         at = m;
5855         sctp_set_prsctp_policy(stcb, sp);
5856         /*
5857          * We could in theory (for sendall) sifa the length in, but we would
5858          * still have to hunt through the chain since we need to setup the
5859          * tail_mbuf
5860          */
5861         while (at) {
5862                 if (SCTP_BUF_NEXT(at) == NULL)
5863                         sp->tail_mbuf = at;
5864                 sp->length += SCTP_BUF_LEN(at);
5865                 at = SCTP_BUF_NEXT(at);
5866         }
5867         SCTP_TCB_SEND_LOCK(stcb);
5868         sctp_snd_sb_alloc(stcb, sp->length);
5869         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5870         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5871         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5872                 sp->strseq = strm->next_sequence_sent;
5873                 strm->next_sequence_sent++;
5874         }
5875         if ((strm->next_spoke.tqe_next == NULL) &&
5876             (strm->next_spoke.tqe_prev == NULL)) {
5877                 /* Not on wheel, insert */
5878                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5879         }
5880         m = NULL;
5881         SCTP_TCB_SEND_UNLOCK(stcb);
5882 out_now:
5883         if (m) {
5884                 sctp_m_freem(m);
5885         }
5886         return (error);
5887 }
5888
5889
5890 static struct mbuf *
5891 sctp_copy_mbufchain(struct mbuf *clonechain,
5892     struct mbuf *outchain,
5893     struct mbuf **endofchain,
5894     int can_take_mbuf,
5895     int sizeofcpy,
5896     uint8_t copy_by_ref)
5897 {
5898         struct mbuf *m;
5899         struct mbuf *appendchain;
5900         caddr_t cp;
5901         int len;
5902
5903         if (endofchain == NULL) {
5904                 /* error */
5905 error_out:
5906                 if (outchain)
5907                         sctp_m_freem(outchain);
5908                 return (NULL);
5909         }
5910         if (can_take_mbuf) {
5911                 appendchain = clonechain;
5912         } else {
5913                 if (!copy_by_ref &&
5914                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5915                     ) {
5916                         /* Its not in a cluster */
5917                         if (*endofchain == NULL) {
5918                                 /* lets get a mbuf cluster */
5919                                 if (outchain == NULL) {
5920                                         /* This is the general case */
5921                         new_mbuf:
5922                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5923                                         if (outchain == NULL) {
5924                                                 goto error_out;
5925                                         }
5926                                         SCTP_BUF_LEN(outchain) = 0;
5927                                         *endofchain = outchain;
5928                                         /* get the prepend space */
5929                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5930                                 } else {
5931                                         /*
5932                                          * We really should not get a NULL
5933                                          * in endofchain
5934                                          */
5935                                         /* find end */
5936                                         m = outchain;
5937                                         while (m) {
5938                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5939                                                         *endofchain = m;
5940                                                         break;
5941                                                 }
5942                                                 m = SCTP_BUF_NEXT(m);
5943                                         }
5944                                         /* sanity */
5945                                         if (*endofchain == NULL) {
5946                                                 /*
5947                                                  * huh, TSNH XXX maybe we
5948                                                  * should panic
5949                                                  */
5950                                                 sctp_m_freem(outchain);
5951                                                 goto new_mbuf;
5952                                         }
5953                                 }
5954                                 /* get the new end of length */
5955                                 len = M_TRAILINGSPACE(*endofchain);
5956                         } else {
5957                                 /* how much is left at the end? */
5958                                 len = M_TRAILINGSPACE(*endofchain);
5959                         }
5960                         /* Find the end of the data, for appending */
5961                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5962
5963                         /* Now lets copy it out */
5964                         if (len >= sizeofcpy) {
5965                                 /* It all fits, copy it in */
5966                                 m_copydata(clonechain, 0, sizeofcpy, cp);
5967                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5968                         } else {
5969                                 /* fill up the end of the chain */
5970                                 if (len > 0) {
5971                                         m_copydata(clonechain, 0, len, cp);
5972                                         SCTP_BUF_LEN((*endofchain)) += len;
5973                                         /* now we need another one */
5974                                         sizeofcpy -= len;
5975                                 }
5976                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5977                                 if (m == NULL) {
5978                                         /* We failed */
5979                                         goto error_out;
5980                                 }
5981                                 SCTP_BUF_NEXT((*endofchain)) = m;
5982                                 *endofchain = m;
5983                                 cp = mtod((*endofchain), caddr_t);
5984                                 m_copydata(clonechain, len, sizeofcpy, cp);
5985                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5986                         }
5987                         return (outchain);
5988                 } else {
5989                         /* copy the old fashion way */
5990                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
5991 #ifdef SCTP_MBUF_LOGGING
5992                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5993                                 struct mbuf *mat;
5994
5995                                 mat = appendchain;
5996                                 while (mat) {
5997                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5998                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5999                                         }
6000                                         mat = SCTP_BUF_NEXT(mat);
6001                                 }
6002                         }
6003 #endif
6004                 }
6005         }
6006         if (appendchain == NULL) {
6007                 /* error */
6008                 if (outchain)
6009                         sctp_m_freem(outchain);
6010                 return (NULL);
6011         }
6012         if (outchain) {
6013                 /* tack on to the end */
6014                 if (*endofchain != NULL) {
6015                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6016                 } else {
6017                         m = outchain;
6018                         while (m) {
6019                                 if (SCTP_BUF_NEXT(m) == NULL) {
6020                                         SCTP_BUF_NEXT(m) = appendchain;
6021                                         break;
6022                                 }
6023                                 m = SCTP_BUF_NEXT(m);
6024                         }
6025                 }
6026                 /*
6027                  * save off the end and update the end-chain postion
6028                  */
6029                 m = appendchain;
6030                 while (m) {
6031                         if (SCTP_BUF_NEXT(m) == NULL) {
6032                                 *endofchain = m;
6033                                 break;
6034                         }
6035                         m = SCTP_BUF_NEXT(m);
6036                 }
6037                 return (outchain);
6038         } else {
6039                 /* save off the end and update the end-chain postion */
6040                 m = appendchain;
6041                 while (m) {
6042                         if (SCTP_BUF_NEXT(m) == NULL) {
6043                                 *endofchain = m;
6044                                 break;
6045                         }
6046                         m = SCTP_BUF_NEXT(m);
6047                 }
6048                 return (appendchain);
6049         }
6050 }
6051
6052 int
6053 sctp_med_chunk_output(struct sctp_inpcb *inp,
6054     struct sctp_tcb *stcb,
6055     struct sctp_association *asoc,
6056     int *num_out,
6057     int *reason_code,
6058     int control_only, int *cwnd_full, int from_where,
6059     struct timeval *now, int *now_filled, int frag_point, int so_locked
6060 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6061     SCTP_UNUSED
6062 #endif
6063 );
6064
6065 static void
6066 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6067     uint32_t val)
6068 {
6069         struct sctp_copy_all *ca;
6070         struct mbuf *m;
6071         int ret = 0;
6072         int added_control = 0;
6073         int un_sent, do_chunk_output = 1;
6074         struct sctp_association *asoc;
6075
6076         ca = (struct sctp_copy_all *)ptr;
6077         if (ca->m == NULL) {
6078                 return;
6079         }
6080         if (ca->inp != inp) {
6081                 /* TSNH */
6082                 return;
6083         }
6084         if ((ca->m) && ca->sndlen) {
6085                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6086                 if (m == NULL) {
6087                         /* can't copy so we are done */
6088                         ca->cnt_failed++;
6089                         return;
6090                 }
6091 #ifdef SCTP_MBUF_LOGGING
6092                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6093                         struct mbuf *mat;
6094
6095                         mat = m;
6096                         while (mat) {
6097                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6098                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6099                                 }
6100                                 mat = SCTP_BUF_NEXT(mat);
6101                         }
6102                 }
6103 #endif
6104         } else {
6105                 m = NULL;
6106         }
6107         SCTP_TCB_LOCK_ASSERT(stcb);
6108         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6109                 /* Abort this assoc with m as the user defined reason */
6110                 if (m) {
6111                         struct sctp_paramhdr *ph;
6112
6113                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6114                         if (m) {
6115                                 ph = mtod(m, struct sctp_paramhdr *);
6116                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6117                                 ph->param_length = htons(ca->sndlen);
6118                         }
6119                         /*
6120                          * We add one here to keep the assoc from
6121                          * dis-appearing on us.
6122                          */
6123                         atomic_add_int(&stcb->asoc.refcnt, 1);
6124                         sctp_abort_an_association(inp, stcb,
6125                             SCTP_RESPONSE_TO_USER_REQ,
6126                             m, SCTP_SO_NOT_LOCKED);
6127                         /*
6128                          * sctp_abort_an_association calls sctp_free_asoc()
6129                          * free association will NOT free it since we
6130                          * incremented the refcnt .. we do this to prevent
6131                          * it being freed and things getting tricky since we
6132                          * could end up (from free_asoc) calling inpcb_free
6133                          * which would get a recursive lock call to the
6134                          * iterator lock.. But as a consequence of that the
6135                          * stcb will return to us un-locked.. since
6136                          * free_asoc returns with either no TCB or the TCB
6137                          * unlocked, we must relock.. to unlock in the
6138                          * iterator timer :-0
6139                          */
6140                         SCTP_TCB_LOCK(stcb);
6141                         atomic_add_int(&stcb->asoc.refcnt, -1);
6142                         goto no_chunk_output;
6143                 }
6144         } else {
6145                 if (m) {
6146                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6147                             &ca->sndrcv, 1);
6148                 }
6149                 asoc = &stcb->asoc;
6150                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6151                         /* shutdown this assoc */
6152                         int cnt;
6153
6154                         cnt = sctp_is_there_unsent_data(stcb);
6155
6156                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6157                             TAILQ_EMPTY(&asoc->sent_queue) &&
6158                             (cnt == 0)) {
6159                                 if (asoc->locked_on_sending) {
6160                                         goto abort_anyway;
6161                                 }
6162                                 /*
6163                                  * there is nothing queued to send, so I'm
6164                                  * done...
6165                                  */
6166                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6167                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6168                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6169                                         /*
6170                                          * only send SHUTDOWN the first time
6171                                          * through
6172                                          */
6173                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6174                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6175                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6176                                         }
6177                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6178                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6179                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6180                                             asoc->primary_destination);
6181                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6182                                             asoc->primary_destination);
6183                                         added_control = 1;
6184                                         do_chunk_output = 0;
6185                                 }
6186                         } else {
6187                                 /*
6188                                  * we still got (or just got) data to send,
6189                                  * so set SHUTDOWN_PENDING
6190                                  */
6191                                 /*
6192                                  * XXX sockets draft says that SCTP_EOF
6193                                  * should be sent with no data.  currently,
6194                                  * we will allow user data to be sent first
6195                                  * and move to SHUTDOWN-PENDING
6196                                  */
6197                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6198                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6199                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6200                                         if (asoc->locked_on_sending) {
6201                                                 /*
6202                                                  * Locked to send out the
6203                                                  * data
6204                                                  */
6205                                                 struct sctp_stream_queue_pending *sp;
6206
6207                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6208                                                 if (sp) {
6209                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6210                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6211                                                 }
6212                                         }
6213                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6214                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6215                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6216                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6217                                 abort_anyway:
6218                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6219                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6220                                                     SCTP_RESPONSE_TO_USER_REQ,
6221                                                     NULL, SCTP_SO_NOT_LOCKED);
6222                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6223                                                 goto no_chunk_output;
6224                                         }
6225                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6226                                             asoc->primary_destination);
6227                                 }
6228                         }
6229
6230                 }
6231         }
6232         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6233             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6234
6235         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6236             (stcb->asoc.total_flight > 0) &&
6237             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6238             ) {
6239                 do_chunk_output = 0;
6240         }
6241         if (do_chunk_output)
6242                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6243         else if (added_control) {
6244                 int num_out = 0, reason = 0, cwnd_full = 0, now_filled = 0;
6245                 struct timeval now;
6246                 int frag_point;
6247
6248                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6249                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6250                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6251         }
6252 no_chunk_output:
6253         if (ret) {
6254                 ca->cnt_failed++;
6255         } else {
6256                 ca->cnt_sent++;
6257         }
6258 }
6259
6260 static void
6261 sctp_sendall_completes(void *ptr, uint32_t val)
6262 {
6263         struct sctp_copy_all *ca;
6264
6265         ca = (struct sctp_copy_all *)ptr;
6266         /*
6267          * Do a notify here? Kacheong suggests that the notify be done at
6268          * the send time.. so you would push up a notification if any send
6269          * failed. Don't know if this is feasable since the only failures we
6270          * have is "memory" related and if you cannot get an mbuf to send
6271          * the data you surely can't get an mbuf to send up to notify the
6272          * user you can't send the data :->
6273          */
6274
6275         /* now free everything */
6276         sctp_m_freem(ca->m);
6277         SCTP_FREE(ca, SCTP_M_COPYAL);
6278 }
6279
6280
6281 #define MC_ALIGN(m, len) do {                                           \
6282         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6283 } while (0)
6284
6285
6286
6287 static struct mbuf *
6288 sctp_copy_out_all(struct uio *uio, int len)
6289 {
6290         struct mbuf *ret, *at;
6291         int left, willcpy, cancpy, error;
6292
6293         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6294         if (ret == NULL) {
6295                 /* TSNH */
6296                 return (NULL);
6297         }
6298         left = len;
6299         SCTP_BUF_LEN(ret) = 0;
6300         /* save space for the data chunk header */
6301         cancpy = M_TRAILINGSPACE(ret);
6302         willcpy = min(cancpy, left);
6303         at = ret;
6304         while (left > 0) {
6305                 /* Align data to the end */
6306                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6307                 if (error) {
6308         err_out_now:
6309                         sctp_m_freem(at);
6310                         return (NULL);
6311                 }
6312                 SCTP_BUF_LEN(at) = willcpy;
6313                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6314                 left -= willcpy;
6315                 if (left > 0) {
6316                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6317                         if (SCTP_BUF_NEXT(at) == NULL) {
6318                                 goto err_out_now;
6319                         }
6320                         at = SCTP_BUF_NEXT(at);
6321                         SCTP_BUF_LEN(at) = 0;
6322                         cancpy = M_TRAILINGSPACE(at);
6323                         willcpy = min(cancpy, left);
6324                 }
6325         }
6326         return (ret);
6327 }
6328
6329 static int
6330 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6331     struct sctp_sndrcvinfo *srcv)
6332 {
6333         int ret;
6334         struct sctp_copy_all *ca;
6335
6336         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6337             SCTP_M_COPYAL);
6338         if (ca == NULL) {
6339                 sctp_m_freem(m);
6340                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6341                 return (ENOMEM);
6342         }
6343         memset(ca, 0, sizeof(struct sctp_copy_all));
6344
6345         ca->inp = inp;
6346         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6347         /*
6348          * take off the sendall flag, it would be bad if we failed to do
6349          * this :-0
6350          */
6351         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6352         /* get length and mbuf chain */
6353         if (uio) {
6354                 ca->sndlen = uio->uio_resid;
6355                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6356                 if (ca->m == NULL) {
6357                         SCTP_FREE(ca, SCTP_M_COPYAL);
6358                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6359                         return (ENOMEM);
6360                 }
6361         } else {
6362                 /* Gather the length of the send */
6363                 struct mbuf *mat;
6364
6365                 mat = m;
6366                 ca->sndlen = 0;
6367                 while (m) {
6368                         ca->sndlen += SCTP_BUF_LEN(m);
6369                         m = SCTP_BUF_NEXT(m);
6370                 }
6371                 ca->m = mat;
6372         }
6373         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6374             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6375             SCTP_ASOC_ANY_STATE,
6376             (void *)ca, 0,
6377             sctp_sendall_completes, inp, 1);
6378         if (ret) {
6379                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6380                 SCTP_FREE(ca, SCTP_M_COPYAL);
6381                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6382                 return (EFAULT);
6383         }
6384         return (0);
6385 }
6386
6387
6388 void
6389 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6390 {
6391         struct sctp_tmit_chunk *chk, *nchk;
6392
6393         chk = TAILQ_FIRST(&asoc->control_send_queue);
6394         while (chk) {
6395                 nchk = TAILQ_NEXT(chk, sctp_next);
6396                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6397                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6398                         if (chk->data) {
6399                                 sctp_m_freem(chk->data);
6400                                 chk->data = NULL;
6401                         }
6402                         asoc->ctrl_queue_cnt--;
6403                         sctp_free_a_chunk(stcb, chk);
6404                 }
6405                 chk = nchk;
6406         }
6407 }
6408
6409 void
6410 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6411 {
6412         struct sctp_association *asoc;
6413         struct sctp_tmit_chunk *chk, *chk_tmp;
6414         struct sctp_asconf_chunk *acp;
6415
6416         asoc = &stcb->asoc;
6417         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6418             chk = chk_tmp) {
6419                 /* get next chk */
6420                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6421                 /* find SCTP_ASCONF chunk in queue */
6422                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6423                         if (chk->data) {
6424                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6425                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6426                                         /* Not Acked yet */
6427                                         break;
6428                                 }
6429                         }
6430                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6431                         if (chk->data) {
6432                                 sctp_m_freem(chk->data);
6433                                 chk->data = NULL;
6434                         }
6435                         asoc->ctrl_queue_cnt--;
6436                         sctp_free_a_chunk(stcb, chk);
6437                 }
6438         }
6439 }
6440
6441
6442 static void
6443 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6444
6445     struct sctp_association *asoc,
6446     struct sctp_tmit_chunk **data_list,
6447     int bundle_at,
6448     struct sctp_nets *net)
6449 {
6450         int i;
6451         struct sctp_tmit_chunk *tp1;
6452
6453         for (i = 0; i < bundle_at; i++) {
6454                 /* off of the send queue */
6455                 if (i) {
6456                         /*
6457                          * Any chunk NOT 0 you zap the time chunk 0 gets
6458                          * zapped or set based on if a RTO measurment is
6459                          * needed.
6460                          */
6461                         data_list[i]->do_rtt = 0;
6462                 }
6463                 /* record time */
6464                 data_list[i]->sent_rcv_time = net->last_sent_time;
6465                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6466                 TAILQ_REMOVE(&asoc->send_queue,
6467                     data_list[i],
6468                     sctp_next);
6469                 /* on to the sent queue */
6470                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6471                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6472                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6473                         struct sctp_tmit_chunk *tpp;
6474
6475                         /* need to move back */
6476         back_up_more:
6477                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6478                         if (tpp == NULL) {
6479                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6480                                 goto all_done;
6481                         }
6482                         tp1 = tpp;
6483                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6484                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6485                                 goto back_up_more;
6486                         }
6487                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6488                 } else {
6489                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6490                             data_list[i],
6491                             sctp_next);
6492                 }
6493 all_done:
6494                 /* This does not lower until the cum-ack passes it */
6495                 asoc->sent_queue_cnt++;
6496                 asoc->send_queue_cnt--;
6497                 if ((asoc->peers_rwnd <= 0) &&
6498                     (asoc->total_flight == 0) &&
6499                     (bundle_at == 1)) {
6500                         /* Mark the chunk as being a window probe */
6501                         SCTP_STAT_INCR(sctps_windowprobed);
6502                 }
6503 #ifdef SCTP_AUDITING_ENABLED
6504                 sctp_audit_log(0xC2, 3);
6505 #endif
6506                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6507                 data_list[i]->snd_count = 1;
6508                 data_list[i]->rec.data.chunk_was_revoked = 0;
6509                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6510                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6511                             data_list[i]->whoTo->flight_size,
6512                             data_list[i]->book_size,
6513                             (uintptr_t) data_list[i]->whoTo,
6514                             data_list[i]->rec.data.TSN_seq);
6515                 }
6516                 sctp_flight_size_increase(data_list[i]);
6517                 sctp_total_flight_increase(stcb, data_list[i]);
6518                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6519                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6520                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6521                 }
6522                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6523                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6524                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6525                         /* SWS sender side engages */
6526                         asoc->peers_rwnd = 0;
6527                 }
6528         }
6529 }
6530
6531 static void
6532 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6533 {
6534         struct sctp_tmit_chunk *chk, *nchk;
6535
6536         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6537             chk; chk = nchk) {
6538                 nchk = TAILQ_NEXT(chk, sctp_next);
6539                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6540                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6541                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6542                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6543                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6544                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6545                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6546                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6547                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6548                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6549                         /* Stray chunks must be cleaned up */
6550         clean_up_anyway:
6551                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6552                         if (chk->data) {
6553                                 sctp_m_freem(chk->data);
6554                                 chk->data = NULL;
6555                         }
6556                         asoc->ctrl_queue_cnt--;
6557                         sctp_free_a_chunk(stcb, chk);
6558                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6559                         /* special handling, we must look into the param */
6560                         if (chk != asoc->str_reset) {
6561                                 goto clean_up_anyway;
6562                         }
6563                 }
6564         }
6565 }
6566
6567
6568 static int
6569 sctp_can_we_split_this(struct sctp_tcb *stcb,
6570     uint32_t length,
6571     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6572 {
6573         /*
6574          * Make a decision on if I should split a msg into multiple parts.
6575          * This is only asked of incomplete messages.
6576          */
6577         if (eeor_on) {
6578                 /*
6579                  * If we are doing EEOR we need to always send it if its the
6580                  * entire thing, since it might be all the guy is putting in
6581                  * the hopper.
6582                  */
6583                 if (goal_mtu >= length) {
6584                         /*-
6585                          * If we have data outstanding,
6586                          * we get another chance when the sack
6587                          * arrives to transmit - wait for more data
6588                          */
6589                         if (stcb->asoc.total_flight == 0) {
6590                                 /*
6591                                  * If nothing is in flight, we zero the
6592                                  * packet counter.
6593                                  */
6594                                 return (length);
6595                         }
6596                         return (0);
6597
6598                 } else {
6599                         /* You can fill the rest */
6600                         return (goal_mtu);
6601                 }
6602         }
6603         /*-
6604          * For those strange folk that make the send buffer
6605          * smaller than our fragmentation point, we can't
6606          * get a full msg in so we have to allow splitting.
6607          */
6608         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6609                 return (length);
6610         }
6611         if ((length <= goal_mtu) ||
6612             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6613                 /* Sub-optimial residual don't split in non-eeor mode. */
6614                 return (0);
6615         }
6616         /*
6617          * If we reach here length is larger than the goal_mtu. Do we wish
6618          * to split it for the sake of packet putting together?
6619          */
6620         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6621                 /* Its ok to split it */
6622                 return (min(goal_mtu, frag_point));
6623         }
6624         /* Nope, can't split */
6625         return (0);
6626
6627 }
6628
6629 static uint32_t
6630 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6631     struct sctp_stream_out *strq,
6632     uint32_t goal_mtu,
6633     uint32_t frag_point,
6634     int *locked,
6635     int *giveup,
6636     int eeor_mode,
6637     int *bail)
6638 {
6639         /* Move from the stream to the send_queue keeping track of the total */
6640         struct sctp_association *asoc;
6641         struct sctp_stream_queue_pending *sp;
6642         struct sctp_tmit_chunk *chk;
6643         struct sctp_data_chunk *dchkh;
6644         uint32_t to_move, length;
6645         uint8_t rcv_flags = 0;
6646         uint8_t some_taken;
6647         uint8_t send_lock_up = 0;
6648
6649         SCTP_TCB_LOCK_ASSERT(stcb);
6650         asoc = &stcb->asoc;
6651 one_more_time:
6652         /* sa_ignore FREED_MEMORY */
6653         sp = TAILQ_FIRST(&strq->outqueue);
6654         if (sp == NULL) {
6655                 *locked = 0;
6656                 if (send_lock_up == 0) {
6657                         SCTP_TCB_SEND_LOCK(stcb);
6658                         send_lock_up = 1;
6659                 }
6660                 sp = TAILQ_FIRST(&strq->outqueue);
6661                 if (sp) {
6662                         goto one_more_time;
6663                 }
6664                 if (strq->last_msg_incomplete) {
6665                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6666                             strq->stream_no,
6667                             strq->last_msg_incomplete);
6668                         strq->last_msg_incomplete = 0;
6669                 }
6670                 to_move = 0;
6671                 if (send_lock_up) {
6672                         SCTP_TCB_SEND_UNLOCK(stcb);
6673                         send_lock_up = 0;
6674                 }
6675                 goto out_of;
6676         }
6677         if ((sp->msg_is_complete) && (sp->length == 0)) {
6678                 if (sp->sender_all_done) {
6679                         /*
6680                          * We are doing differed cleanup. Last time through
6681                          * when we took all the data the sender_all_done was
6682                          * not set.
6683                          */
6684                         if (sp->put_last_out == 0) {
6685                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6686                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6687                                     sp->sender_all_done,
6688                                     sp->length,
6689                                     sp->msg_is_complete,
6690                                     sp->put_last_out,
6691                                     send_lock_up);
6692                         }
6693                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6694                                 SCTP_TCB_SEND_LOCK(stcb);
6695                                 send_lock_up = 1;
6696                         }
6697                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6698                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6699                         sctp_free_remote_addr(sp->net);
6700                         if (sp->data) {
6701                                 sctp_m_freem(sp->data);
6702                                 sp->data = NULL;
6703                         }
6704                         sctp_free_a_strmoq(stcb, sp);
6705
6706                         /* we can't be locked to it */
6707                         *locked = 0;
6708                         stcb->asoc.locked_on_sending = NULL;
6709                         if (send_lock_up) {
6710                                 SCTP_TCB_SEND_UNLOCK(stcb);
6711                                 send_lock_up = 0;
6712                         }
6713                         /* back to get the next msg */
6714                         goto one_more_time;
6715                 } else {
6716                         /*
6717                          * sender just finished this but still holds a
6718                          * reference
6719                          */
6720                         *locked = 1;
6721                         *giveup = 1;
6722                         to_move = 0;
6723                         goto out_of;
6724                 }
6725         } else {
6726                 /* is there some to get */
6727                 if (sp->length == 0) {
6728                         /* no */
6729                         *locked = 1;
6730                         *giveup = 1;
6731                         to_move = 0;
6732                         goto out_of;
6733                 }
6734         }
6735         some_taken = sp->some_taken;
6736         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6737                 sp->msg_is_complete = 1;
6738         }
6739 re_look:
6740         length = sp->length;
6741         if (sp->msg_is_complete) {
6742                 /* The message is complete */
6743                 to_move = min(length, frag_point);
6744                 if (to_move == length) {
6745                         /* All of it fits in the MTU */
6746                         if (sp->some_taken) {
6747                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6748                                 sp->put_last_out = 1;
6749                         } else {
6750                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6751                                 sp->put_last_out = 1;
6752                         }
6753                 } else {
6754                         /* Not all of it fits, we fragment */
6755                         if (sp->some_taken == 0) {
6756                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6757                         }
6758                         sp->some_taken = 1;
6759                 }
6760         } else {
6761                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu,
6762                     frag_point, eeor_mode);
6763                 if (to_move) {
6764                         /*-
6765                          * We use a snapshot of length in case it
6766                          * is expanding during the compare.
6767                          */
6768                         uint32_t llen;
6769
6770                         llen = length;
6771                         if (to_move >= llen) {
6772                                 to_move = llen;
6773                                 if (send_lock_up == 0) {
6774                                         /*-
6775                                          * We are taking all of an incomplete msg
6776                                          * thus we need a send lock.
6777                                          */
6778                                         SCTP_TCB_SEND_LOCK(stcb);
6779                                         send_lock_up = 1;
6780                                         if (sp->msg_is_complete) {
6781                                                 /*
6782                                                  * the sender finished the
6783                                                  * msg
6784                                                  */
6785                                                 goto re_look;
6786                                         }
6787                                 }
6788                         }
6789                         if (sp->some_taken == 0) {
6790                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6791                                 sp->some_taken = 1;
6792                         }
6793                 } else {
6794                         /* Nothing to take. */
6795                         if (sp->some_taken) {
6796                                 *locked = 1;
6797                         }
6798                         *giveup = 1;
6799                         to_move = 0;
6800                         goto out_of;
6801                 }
6802         }
6803
6804         /* If we reach here, we can copy out a chunk */
6805         sctp_alloc_a_chunk(stcb, chk);
6806         if (chk == NULL) {
6807                 /* No chunk memory */
6808                 *giveup = 1;
6809                 to_move = 0;
6810                 goto out_of;
6811         }
6812         /*
6813          * Setup for unordered if needed by looking at the user sent info
6814          * flags.
6815          */
6816         if (sp->sinfo_flags & SCTP_UNORDERED) {
6817                 rcv_flags |= SCTP_DATA_UNORDERED;
6818         }
6819         /* clear out the chunk before setting up */
6820         memset(chk, 0, sizeof(*chk));
6821         chk->rec.data.rcv_flags = rcv_flags;
6822
6823         if (to_move >= length) {
6824                 /* we think we can steal the whole thing */
6825                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6826                         SCTP_TCB_SEND_LOCK(stcb);
6827                         send_lock_up = 1;
6828                 }
6829                 if (to_move < sp->length) {
6830                         /* bail, it changed */
6831                         goto dont_do_it;
6832                 }
6833                 chk->data = sp->data;
6834                 chk->last_mbuf = sp->tail_mbuf;
6835                 /* register the stealing */
6836                 sp->data = sp->tail_mbuf = NULL;
6837         } else {
6838                 struct mbuf *m;
6839
6840 dont_do_it:
6841                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6842                 chk->last_mbuf = NULL;
6843                 if (chk->data == NULL) {
6844                         sp->some_taken = some_taken;
6845                         sctp_free_a_chunk(stcb, chk);
6846                         *bail = 1;
6847                         to_move = 0;
6848                         goto out_of;
6849                 }
6850 #ifdef SCTP_MBUF_LOGGING
6851                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6852                         struct mbuf *mat;
6853
6854                         mat = chk->data;
6855                         while (mat) {
6856                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6857                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6858                                 }
6859                                 mat = SCTP_BUF_NEXT(mat);
6860                         }
6861                 }
6862 #endif
6863                 /* Pull off the data */
6864                 m_adj(sp->data, to_move);
6865                 /* Now lets work our way down and compact it */
6866                 m = sp->data;
6867                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6868                         sp->data = SCTP_BUF_NEXT(m);
6869                         SCTP_BUF_NEXT(m) = NULL;
6870                         if (sp->tail_mbuf == m) {
6871                                 /*-
6872                                  * Freeing tail? TSNH since
6873                                  * we supposedly were taking less
6874                                  * than the sp->length.
6875                                  */
6876 #ifdef INVARIANTS
6877                                 panic("Huh, freing tail? - TSNH");
6878 #else
6879                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6880                                 sp->tail_mbuf = sp->data = NULL;
6881                                 sp->length = 0;
6882 #endif
6883
6884                         }
6885                         sctp_m_free(m);
6886                         m = sp->data;
6887                 }
6888         }
6889         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6890                 chk->copy_by_ref = 1;
6891         } else {
6892                 chk->copy_by_ref = 0;
6893         }
6894         /*
6895          * get last_mbuf and counts of mb useage This is ugly but hopefully
6896          * its only one mbuf.
6897          */
6898         if (chk->last_mbuf == NULL) {
6899                 chk->last_mbuf = chk->data;
6900                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6901                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6902                 }
6903         }
6904         if (to_move > length) {
6905                 /*- This should not happen either
6906                  * since we always lower to_move to the size
6907                  * of sp->length if its larger.
6908                  */
6909 #ifdef INVARIANTS
6910                 panic("Huh, how can to_move be larger?");
6911 #else
6912                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6913                 sp->length = 0;
6914 #endif
6915         } else {
6916                 atomic_subtract_int(&sp->length, to_move);
6917         }
6918         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6919                 /* Not enough room for a chunk header, get some */
6920                 struct mbuf *m;
6921
6922                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6923                 if (m == NULL) {
6924                         /*
6925                          * we're in trouble here. _PREPEND below will free
6926                          * all the data if there is no leading space, so we
6927                          * must put the data back and restore.
6928                          */
6929                         if (send_lock_up == 0) {
6930                                 SCTP_TCB_SEND_LOCK(stcb);
6931                                 send_lock_up = 1;
6932                         }
6933                         if (chk->data == NULL) {
6934                                 /* unsteal the data */
6935                                 sp->data = chk->data;
6936                                 sp->tail_mbuf = chk->last_mbuf;
6937                         } else {
6938                                 struct mbuf *m_tmp;
6939
6940                                 /* reassemble the data */
6941                                 m_tmp = sp->data;
6942                                 sp->data = chk->data;
6943                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
6944                         }
6945                         sp->some_taken = some_taken;
6946                         atomic_add_int(&sp->length, to_move);
6947                         chk->data = NULL;
6948                         *bail = 1;
6949                         sctp_free_a_chunk(stcb, chk);
6950                         to_move = 0;
6951                         goto out_of;
6952                 } else {
6953                         SCTP_BUF_LEN(m) = 0;
6954                         SCTP_BUF_NEXT(m) = chk->data;
6955                         chk->data = m;
6956                         M_ALIGN(chk->data, 4);
6957                 }
6958         }
6959         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
6960         if (chk->data == NULL) {
6961                 /* HELP, TSNH since we assured it would not above? */
6962 #ifdef INVARIANTS
6963                 panic("prepend failes HELP?");
6964 #else
6965                 SCTP_PRINTF("prepend fails HELP?\n");
6966                 sctp_free_a_chunk(stcb, chk);
6967 #endif
6968                 *bail = 1;
6969                 to_move = 0;
6970                 goto out_of;
6971         }
6972         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
6973         chk->book_size = chk->send_size = (to_move +
6974             sizeof(struct sctp_data_chunk));
6975         chk->book_size_scale = 0;
6976         chk->sent = SCTP_DATAGRAM_UNSENT;
6977
6978         chk->flags = 0;
6979         chk->asoc = &stcb->asoc;
6980         chk->pad_inplace = 0;
6981         chk->no_fr_allowed = 0;
6982         chk->rec.data.stream_seq = sp->strseq;
6983         chk->rec.data.stream_number = sp->stream;
6984         chk->rec.data.payloadtype = sp->ppid;
6985         chk->rec.data.context = sp->context;
6986         chk->rec.data.doing_fast_retransmit = 0;
6987         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
6988
6989         chk->rec.data.timetodrop = sp->ts;
6990         chk->flags = sp->act_flags;
6991         chk->addr_over = sp->addr_over;
6992
6993         chk->whoTo = net;
6994         atomic_add_int(&chk->whoTo->ref_count, 1);
6995
6996         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
6997         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
6998                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
6999                     (uintptr_t) stcb, sp->length,
7000                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7001                     chk->rec.data.TSN_seq);
7002         }
7003         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7004         /*
7005          * Put the rest of the things in place now. Size was done earlier in
7006          * previous loop prior to padding.
7007          */
7008
7009 #ifdef SCTP_ASOCLOG_OF_TSNS
7010         SCTP_TCB_LOCK_ASSERT(stcb);
7011         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7012                 asoc->tsn_out_at = 0;
7013                 asoc->tsn_out_wrapped = 1;
7014         }
7015         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7016         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7017         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7018         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7019         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7020         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7021         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7022         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7023         asoc->tsn_out_at++;
7024 #endif
7025
7026         dchkh->ch.chunk_type = SCTP_DATA;
7027         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7028         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7029         dchkh->dp.stream_id = htons(strq->stream_no);
7030         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7031         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7032         dchkh->ch.chunk_length = htons(chk->send_size);
7033         /* Now advance the chk->send_size by the actual pad needed. */
7034         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7035                 /* need a pad */
7036                 struct mbuf *lm;
7037                 int pads;
7038
7039                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7040                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7041                         chk->pad_inplace = 1;
7042                 }
7043                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7044                         /* pad added an mbuf */
7045                         chk->last_mbuf = lm;
7046                 }
7047                 chk->send_size += pads;
7048         }
7049         /* We only re-set the policy if it is on */
7050         if (sp->pr_sctp_on) {
7051                 sctp_set_prsctp_policy(stcb, sp);
7052                 asoc->pr_sctp_cnt++;
7053                 chk->pr_sctp_on = 1;
7054         } else {
7055                 chk->pr_sctp_on = 0;
7056         }
7057         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7058                 /* All done pull and kill the message */
7059                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7060                 if (sp->put_last_out == 0) {
7061                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7062                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7063                             sp->sender_all_done,
7064                             sp->length,
7065                             sp->msg_is_complete,
7066                             sp->put_last_out,
7067                             send_lock_up);
7068                 }
7069                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7070                         SCTP_TCB_SEND_LOCK(stcb);
7071                         send_lock_up = 1;
7072                 }
7073                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7074                 sctp_free_remote_addr(sp->net);
7075                 if (sp->data) {
7076                         sctp_m_freem(sp->data);
7077                         sp->data = NULL;
7078                 }
7079                 sctp_free_a_strmoq(stcb, sp);
7080
7081                 /* we can't be locked to it */
7082                 *locked = 0;
7083                 stcb->asoc.locked_on_sending = NULL;
7084         } else {
7085                 /* more to go, we are locked */
7086                 *locked = 1;
7087         }
7088         asoc->chunks_on_out_queue++;
7089         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7090         asoc->send_queue_cnt++;
7091 out_of:
7092         if (send_lock_up) {
7093                 SCTP_TCB_SEND_UNLOCK(stcb);
7094                 send_lock_up = 0;
7095         }
7096         return (to_move);
7097 }
7098
7099
7100 static struct sctp_stream_out *
7101 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7102 {
7103         struct sctp_stream_out *strq;
7104
7105         /* Find the next stream to use */
7106         if (asoc->last_out_stream == NULL) {
7107                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
7108                 if (asoc->last_out_stream == NULL) {
7109                         /* huh nothing on the wheel, TSNH */
7110                         return (NULL);
7111                 }
7112                 goto done_it;
7113         }
7114         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7115 done_it:
7116         if (strq == NULL) {
7117                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
7118         }
7119         /* Save off the last stream */
7120         asoc->last_out_stream = strq;
7121         return (strq);
7122
7123 }
7124
7125
7126 static void
7127 sctp_fill_outqueue(struct sctp_tcb *stcb,
7128     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7129 {
7130         struct sctp_association *asoc;
7131         struct sctp_stream_out *strq, *strqn, *strqt;
7132         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7133         int locked, giveup;
7134         struct sctp_stream_queue_pending *sp;
7135
7136         SCTP_TCB_LOCK_ASSERT(stcb);
7137         asoc = &stcb->asoc;
7138 #ifdef INET6
7139         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7140                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7141         } else {
7142                 /* ?? not sure what else to do */
7143                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7144         }
7145 #else
7146         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7147 #endif
7148         /* Need an allowance for the data chunk header too */
7149         goal_mtu -= sizeof(struct sctp_data_chunk);
7150
7151         /* must make even word boundary */
7152         goal_mtu &= 0xfffffffc;
7153         if (asoc->locked_on_sending) {
7154                 /* We are stuck on one stream until the message completes. */
7155                 strqn = strq = asoc->locked_on_sending;
7156                 locked = 1;
7157         } else {
7158                 strqn = strq = sctp_select_a_stream(stcb, asoc);
7159                 locked = 0;
7160         }
7161
7162         while ((goal_mtu > 0) && strq) {
7163                 sp = TAILQ_FIRST(&strq->outqueue);
7164                 /*
7165                  * If CMT is off, we must validate that the stream in
7166                  * question has the first item pointed towards are network
7167                  * destionation requested by the caller. Note that if we
7168                  * turn out to be locked to a stream (assigning TSN's then
7169                  * we must stop, since we cannot look for another stream
7170                  * with data to send to that destination). In CMT's case, by
7171                  * skipping this check, we will send one data packet towards
7172                  * the requested net.
7173                  */
7174                 if (sp == NULL) {
7175                         break;
7176                 }
7177                 if ((sp->net != net) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
7178                         /* none for this network */
7179                         if (locked) {
7180                                 break;
7181                         } else {
7182                                 strq = sctp_select_a_stream(stcb, asoc);
7183                                 if (strq == NULL)
7184                                         /* none left */
7185                                         break;
7186                                 if (strqn == strq) {
7187                                         /* I have circled */
7188                                         break;
7189                                 }
7190                                 continue;
7191                         }
7192                 }
7193                 giveup = 0;
7194                 bail = 0;
7195                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7196                     &giveup, eeor_mode, &bail);
7197                 asoc->last_out_stream = strq;
7198                 if (locked) {
7199                         asoc->locked_on_sending = strq;
7200                         if ((moved_how_much == 0) || (giveup) || bail)
7201                                 /* no more to move for now */
7202                                 break;
7203                 } else {
7204                         asoc->locked_on_sending = NULL;
7205                         strqt = sctp_select_a_stream(stcb, asoc);
7206                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
7207                                 if (strq == strqn) {
7208                                         /* Must move start to next one */
7209                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7210                                         if (strqn == NULL) {
7211                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7212                                                 if (strqn == NULL) {
7213                                                         break;
7214                                                 }
7215                                         }
7216                                 }
7217                                 sctp_remove_from_wheel(stcb, asoc, strq);
7218                         }
7219                         if ((giveup) || bail) {
7220                                 break;
7221                         }
7222                         strq = strqt;
7223                         if (strq == NULL) {
7224                                 break;
7225                         }
7226                 }
7227                 total_moved += moved_how_much;
7228                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7229                 goal_mtu &= 0xfffffffc;
7230         }
7231         if (bail)
7232                 *quit_now = 1;
7233
7234         if (total_moved == 0) {
7235                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) &&
7236                     (net == stcb->asoc.primary_destination)) {
7237                         /* ran dry for primary network net */
7238                         SCTP_STAT_INCR(sctps_primary_randry);
7239                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7240                         /* ran dry with CMT on */
7241                         SCTP_STAT_INCR(sctps_cmt_randry);
7242                 }
7243         }
7244 }
7245
7246 void
7247 sctp_fix_ecn_echo(struct sctp_association *asoc)
7248 {
7249         struct sctp_tmit_chunk *chk;
7250
7251         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7252                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7253                         chk->sent = SCTP_DATAGRAM_UNSENT;
7254                 }
7255         }
7256 }
7257
7258 static void
7259 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7260     struct sctp_association *asoc,
7261     struct sctp_nets *net)
7262 {
7263         struct sctp_tmit_chunk *chk;
7264         struct sctp_nets *a_net;
7265
7266         SCTP_TCB_LOCK_ASSERT(stcb);
7267         /*
7268          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7269          * destination using the PF algorithm for finding alternate
7270          * destinations.
7271          */
7272         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
7273                 a_net = sctp_find_alternate_net(stcb, net, 2);
7274         } else {
7275                 a_net = sctp_find_alternate_net(stcb, net, 0);
7276         }
7277         if ((a_net != net) &&
7278             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7279                 /*
7280                  * We only proceed if a valid alternate is found that is not
7281                  * this one and is reachable. Here we must move all chunks
7282                  * queued in the send queue off of the destination address
7283                  * to our alternate.
7284                  */
7285                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7286                         if (chk->whoTo == net) {
7287                                 /* Move the chunk to our alternate */
7288                                 sctp_free_remote_addr(chk->whoTo);
7289                                 chk->whoTo = a_net;
7290                                 atomic_add_int(&a_net->ref_count, 1);
7291                         }
7292                 }
7293         }
7294 }
7295
7296 int
7297 sctp_med_chunk_output(struct sctp_inpcb *inp,
7298     struct sctp_tcb *stcb,
7299     struct sctp_association *asoc,
7300     int *num_out,
7301     int *reason_code,
7302     int control_only, int *cwnd_full, int from_where,
7303     struct timeval *now, int *now_filled, int frag_point, int so_locked
7304 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7305     SCTP_UNUSED
7306 #endif
7307 )
7308 {
7309         /*
7310          * Ok this is the generic chunk service queue. we must do the
7311          * following: - Service the stream queue that is next, moving any
7312          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7313          * LAST to the out queue in one pass) and assigning TSN's - Check to
7314          * see if the cwnd/rwnd allows any output, if so we go ahead and
7315          * fomulate and send the low level chunks. Making sure to combine
7316          * any control in the control chunk queue also.
7317          */
7318         struct sctp_nets *net;
7319         struct mbuf *outchain, *endoutchain;
7320         struct sctp_tmit_chunk *chk, *nchk;
7321         struct sctphdr *shdr;
7322
7323         /* temp arrays for unlinking */
7324         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7325         int no_fragmentflg, error;
7326         int one_chunk, hbflag, skip_data_for_this_net;
7327         int asconf, cookie, no_out_cnt;
7328         int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
7329         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7330         struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
7331         int tsns_sent = 0;
7332         uint32_t auth_offset = 0;
7333         struct sctp_auth_chunk *auth = NULL;
7334
7335         /*
7336          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7337          * destination.
7338          */
7339         int pf_hbflag = 0;
7340         int quit_now = 0;
7341
7342         *num_out = 0;
7343         cwnd_full_ind = 0;
7344
7345         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7346             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7347             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7348                 eeor_mode = 1;
7349         } else {
7350                 eeor_mode = 0;
7351         }
7352         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7353         /*
7354          * First lets prime the pump. For each destination, if there is room
7355          * in the flight size, attempt to pull an MTU's worth out of the
7356          * stream queues into the general send_queue
7357          */
7358 #ifdef SCTP_AUDITING_ENABLED
7359         sctp_audit_log(0xC2, 2);
7360 #endif
7361         SCTP_TCB_LOCK_ASSERT(stcb);
7362         hbflag = 0;
7363         if ((control_only) || (asoc->stream_reset_outstanding))
7364                 no_data_chunks = 1;
7365         else
7366                 no_data_chunks = 0;
7367
7368         /* Nothing to possible to send? */
7369         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7370             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7371             TAILQ_EMPTY(&asoc->send_queue) &&
7372             TAILQ_EMPTY(&asoc->out_wheel)) {
7373                 *reason_code = 9;
7374                 return (0);
7375         }
7376         if (asoc->peers_rwnd == 0) {
7377                 /* No room in peers rwnd */
7378                 *cwnd_full = 1;
7379                 *reason_code = 1;
7380                 if (asoc->total_flight > 0) {
7381                         /* we are allowed one chunk in flight */
7382                         no_data_chunks = 1;
7383                 }
7384         }
7385         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7386                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7387                         /*
7388                          * for CMT we start at the next one past the one we
7389                          * last added data to.
7390                          */
7391                         if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
7392                                 goto skip_the_fill_from_streams;
7393                         }
7394                         if (asoc->last_net_data_came_from) {
7395                                 net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
7396                                 if (net == NULL) {
7397                                         net = TAILQ_FIRST(&asoc->nets);
7398                                 }
7399                         } else {
7400                                 /* back to start */
7401                                 net = TAILQ_FIRST(&asoc->nets);
7402                         }
7403
7404                         /*
7405                          * JRI-TODO: CMT-MPI. Simply set the first
7406                          * destination (net) to be optimized for the next
7407                          * message to be pulled out of the outwheel. 1. peek
7408                          * at outwheel 2. If large message, set net =
7409                          * highest_cwnd 3. If small message, set net =
7410                          * lowest rtt
7411                          */
7412                 } else {
7413                         net = asoc->primary_destination;
7414                         if (net == NULL) {
7415                                 /* TSNH */
7416                                 net = TAILQ_FIRST(&asoc->nets);
7417                         }
7418                 }
7419                 start_at = net;
7420
7421 one_more_time:
7422                 for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7423                         net->window_probe = 0;
7424                         if (old_startat && (old_startat == net)) {
7425                                 break;
7426                         }
7427                         /*
7428                          * JRI: if dest is unreachable or unconfirmed, do
7429                          * not send data to it
7430                          */
7431                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7432                                 continue;
7433                         }
7434                         /*
7435                          * JRI: if dest is in PF state, do not send data to
7436                          * it
7437                          */
7438                         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
7439                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
7440                             (net->dest_state & SCTP_ADDR_PF)) {
7441                                 continue;
7442                         }
7443                         if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7444                                 /* nothing can be in queue for this guy */
7445                                 continue;
7446                         }
7447                         if (net->flight_size >= net->cwnd) {
7448                                 /* skip this network, no room */
7449                                 cwnd_full_ind++;
7450                                 continue;
7451                         }
7452                         /*
7453                          * JRI : this for loop we are in takes in each net,
7454                          * if its's got space in cwnd and has data sent to
7455                          * it (when CMT is off) then it calls
7456                          * sctp_fill_outqueue for the net. This gets data on
7457                          * the send queue for that network.
7458                          *
7459                          * In sctp_fill_outqueue TSN's are assigned and data is
7460                          * copied out of the stream buffers. Note mostly
7461                          * copy by reference (we hope).
7462                          */
7463                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7464                                 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7465                         }
7466                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7467                         if (quit_now) {
7468                                 /* memory alloc failure */
7469                                 no_data_chunks = 1;
7470                                 goto skip_the_fill_from_streams;
7471                         }
7472                 }
7473                 if (start_at != TAILQ_FIRST(&asoc->nets)) {
7474                         /* got to pick up the beginning stuff. */
7475                         old_startat = start_at;
7476                         start_at = net = TAILQ_FIRST(&asoc->nets);
7477                         if (old_startat)
7478                                 goto one_more_time;
7479                 }
7480         }
7481 skip_the_fill_from_streams:
7482         *cwnd_full = cwnd_full_ind;
7483
7484         /* now service each destination and send out what we can for it */
7485         /* Nothing to send? */
7486         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7487             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7488             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7489                 *reason_code = 8;
7490                 return (0);
7491         }
7492         if (no_data_chunks) {
7493                 chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7494                 if (chk == NULL)
7495                         chk = TAILQ_FIRST(&asoc->control_send_queue);
7496         } else {
7497                 chk = TAILQ_FIRST(&asoc->send_queue);
7498         }
7499         if (chk) {
7500                 send_start_at = chk->whoTo;
7501         } else {
7502                 send_start_at = TAILQ_FIRST(&asoc->nets);
7503         }
7504         old_startat = NULL;
7505 again_one_more_time:
7506         for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7507                 /* how much can we send? */
7508                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7509                 if (old_startat && (old_startat == net)) {
7510                         /* through list ocmpletely. */
7511                         break;
7512                 }
7513                 tsns_sent = 0;
7514                 if (net->ref_count < 2) {
7515                         /*
7516                          * Ref-count of 1 so we cannot have data or control
7517                          * queued to this address. Skip it.
7518                          */
7519                         continue;
7520                 }
7521                 ctl_cnt = bundle_at = 0;
7522                 endoutchain = outchain = NULL;
7523                 no_fragmentflg = 1;
7524                 one_chunk = 0;
7525                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7526                         skip_data_for_this_net = 1;
7527                 } else {
7528                         skip_data_for_this_net = 0;
7529                 }
7530                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7531                         /*
7532                          * if we have a route and an ifp check to see if we
7533                          * have room to send to this guy
7534                          */
7535                         struct ifnet *ifp;
7536
7537                         ifp = net->ro.ro_rt->rt_ifp;
7538                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7539                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7540                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7541                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7542                                 }
7543                                 continue;
7544                         }
7545                 }
7546                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7547                 case AF_INET:
7548                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7549                         break;
7550 #ifdef INET6
7551                 case AF_INET6:
7552                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7553                         break;
7554 #endif
7555                 default:
7556                         /* TSNH */
7557                         mtu = net->mtu;
7558                         break;
7559                 }
7560                 mx_mtu = mtu;
7561                 to_out = 0;
7562                 if (mtu > asoc->peers_rwnd) {
7563                         if (asoc->total_flight > 0) {
7564                                 /* We have a packet in flight somewhere */
7565                                 r_mtu = asoc->peers_rwnd;
7566                         } else {
7567                                 /* We are always allowed to send one MTU out */
7568                                 one_chunk = 1;
7569                                 r_mtu = mtu;
7570                         }
7571                 } else {
7572                         r_mtu = mtu;
7573                 }
7574                 /************************/
7575                 /* ASCONF transmission */
7576                 /************************/
7577                 /* Now first lets go through the asconf queue */
7578                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7579                     chk; chk = nchk) {
7580                         nchk = TAILQ_NEXT(chk, sctp_next);
7581                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7582                                 continue;
7583                         }
7584                         if (chk->whoTo != net) {
7585                                 /*
7586                                  * No, not sent to the network we are
7587                                  * looking at
7588                                  */
7589                                 break;
7590                         }
7591                         if (chk->data == NULL) {
7592                                 break;
7593                         }
7594                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7595                             chk->sent != SCTP_DATAGRAM_RESEND) {
7596                                 break;
7597                         }
7598                         /*
7599                          * if no AUTH is yet included and this chunk
7600                          * requires it, make sure to account for it.  We
7601                          * don't apply the size until the AUTH chunk is
7602                          * actually added below in case there is no room for
7603                          * this chunk. NOTE: we overload the use of "omtu"
7604                          * here
7605                          */
7606                         if ((auth == NULL) &&
7607                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7608                             stcb->asoc.peer_auth_chunks)) {
7609                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7610                         } else
7611                                 omtu = 0;
7612                         /* Here we do NOT factor the r_mtu */
7613                         if ((chk->send_size < (int)(mtu - omtu)) ||
7614                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7615                                 /*
7616                                  * We probably should glom the mbuf chain
7617                                  * from the chk->data for control but the
7618                                  * problem is it becomes yet one more level
7619                                  * of tracking to do if for some reason
7620                                  * output fails. Then I have got to
7621                                  * reconstruct the merged control chain.. el
7622                                  * yucko.. for now we take the easy way and
7623                                  * do the copy
7624                                  */
7625                                 /*
7626                                  * Add an AUTH chunk, if chunk requires it
7627                                  * save the offset into the chain for AUTH
7628                                  */
7629                                 if ((auth == NULL) &&
7630                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7631                                     stcb->asoc.peer_auth_chunks))) {
7632                                         outchain = sctp_add_auth_chunk(outchain,
7633                                             &endoutchain,
7634                                             &auth,
7635                                             &auth_offset,
7636                                             stcb,
7637                                             chk->rec.chunk_id.id);
7638                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7639                                 }
7640                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7641                                     (int)chk->rec.chunk_id.can_take_data,
7642                                     chk->send_size, chk->copy_by_ref);
7643                                 if (outchain == NULL) {
7644                                         *reason_code = 8;
7645                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7646                                         return (ENOMEM);
7647                                 }
7648                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7649                                 /* update our MTU size */
7650                                 if (mtu > (chk->send_size + omtu))
7651                                         mtu -= (chk->send_size + omtu);
7652                                 else
7653                                         mtu = 0;
7654                                 to_out += (chk->send_size + omtu);
7655                                 /* Do clear IP_DF ? */
7656                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7657                                         no_fragmentflg = 0;
7658                                 }
7659                                 if (chk->rec.chunk_id.can_take_data)
7660                                         chk->data = NULL;
7661                                 /*
7662                                  * set hb flag since we can use these for
7663                                  * RTO
7664                                  */
7665                                 hbflag = 1;
7666                                 asconf = 1;
7667                                 /*
7668                                  * should sysctl this: don't bundle data
7669                                  * with ASCONF since it requires AUTH
7670                                  */
7671                                 no_data_chunks = 1;
7672                                 chk->sent = SCTP_DATAGRAM_SENT;
7673                                 chk->snd_count++;
7674                                 if (mtu == 0) {
7675                                         /*
7676                                          * Ok we are out of room but we can
7677                                          * output without effecting the
7678                                          * flight size since this little guy
7679                                          * is a control only packet.
7680                                          */
7681                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7682                                         /*
7683                                          * do NOT clear the asconf flag as
7684                                          * it is used to do appropriate
7685                                          * source address selection.
7686                                          */
7687                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7688                                         if (outchain == NULL) {
7689                                                 /* no memory */
7690                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7691                                                 error = ENOBUFS;
7692                                                 *reason_code = 7;
7693                                                 continue;
7694                                         }
7695                                         shdr = mtod(outchain, struct sctphdr *);
7696                                         shdr->src_port = inp->sctp_lport;
7697                                         shdr->dest_port = stcb->rport;
7698                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7699                                         shdr->checksum = 0;
7700                                         auth_offset += sizeof(struct sctphdr);
7701                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7702                                             (struct sockaddr *)&net->ro._l_addr,
7703                                             outchain, auth_offset, auth,
7704                                             no_fragmentflg, 0, NULL, asconf, net->port, so_locked, NULL))) {
7705                                                 if (error == ENOBUFS) {
7706                                                         asoc->ifp_had_enobuf = 1;
7707                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7708                                                 }
7709                                                 if (from_where == 0) {
7710                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7711                                                 }
7712                                                 if (*now_filled == 0) {
7713                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7714                                                         *now_filled = 1;
7715                                                         *now = net->last_sent_time;
7716                                                 } else {
7717                                                         net->last_sent_time = *now;
7718                                                 }
7719                                                 hbflag = 0;
7720                                                 /* error, could not output */
7721                                                 if (error == EHOSTUNREACH) {
7722                                                         /*
7723                                                          * Destination went
7724                                                          * unreachable
7725                                                          * during this send
7726                                                          */
7727                                                         sctp_move_to_an_alt(stcb, asoc, net);
7728                                                 }
7729                                                 *reason_code = 7;
7730                                                 continue;
7731                                         } else
7732                                                 asoc->ifp_had_enobuf = 0;
7733                                         if (*now_filled == 0) {
7734                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7735                                                 *now_filled = 1;
7736                                                 *now = net->last_sent_time;
7737                                         } else {
7738                                                 net->last_sent_time = *now;
7739                                         }
7740                                         hbflag = 0;
7741                                         /*
7742                                          * increase the number we sent, if a
7743                                          * cookie is sent we don't tell them
7744                                          * any was sent out.
7745                                          */
7746                                         outchain = endoutchain = NULL;
7747                                         auth = NULL;
7748                                         auth_offset = 0;
7749                                         if (!no_out_cnt)
7750                                                 *num_out += ctl_cnt;
7751                                         /* recalc a clean slate and setup */
7752                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7753                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7754                                         } else {
7755                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7756                                         }
7757                                         to_out = 0;
7758                                         no_fragmentflg = 1;
7759                                 }
7760                         }
7761                 }
7762                 /************************/
7763                 /* Control transmission */
7764                 /************************/
7765                 /* Now first lets go through the control queue */
7766                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7767                     chk; chk = nchk) {
7768                         nchk = TAILQ_NEXT(chk, sctp_next);
7769                         if (chk->whoTo != net) {
7770                                 /*
7771                                  * No, not sent to the network we are
7772                                  * looking at
7773                                  */
7774                                 continue;
7775                         }
7776                         if (chk->data == NULL) {
7777                                 continue;
7778                         }
7779                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7780                                 /*
7781                                  * It must be unsent. Cookies and ASCONF's
7782                                  * hang around but there timers will force
7783                                  * when marked for resend.
7784                                  */
7785                                 continue;
7786                         }
7787                         /*
7788                          * if no AUTH is yet included and this chunk
7789                          * requires it, make sure to account for it.  We
7790                          * don't apply the size until the AUTH chunk is
7791                          * actually added below in case there is no room for
7792                          * this chunk. NOTE: we overload the use of "omtu"
7793                          * here
7794                          */
7795                         if ((auth == NULL) &&
7796                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7797                             stcb->asoc.peer_auth_chunks)) {
7798                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7799                         } else
7800                                 omtu = 0;
7801                         /* Here we do NOT factor the r_mtu */
7802                         if ((chk->send_size < (int)(mtu - omtu)) ||
7803                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7804                                 /*
7805                                  * We probably should glom the mbuf chain
7806                                  * from the chk->data for control but the
7807                                  * problem is it becomes yet one more level
7808                                  * of tracking to do if for some reason
7809                                  * output fails. Then I have got to
7810                                  * reconstruct the merged control chain.. el
7811                                  * yucko.. for now we take the easy way and
7812                                  * do the copy
7813                                  */
7814                                 /*
7815                                  * Add an AUTH chunk, if chunk requires it
7816                                  * save the offset into the chain for AUTH
7817                                  */
7818                                 if ((auth == NULL) &&
7819                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7820                                     stcb->asoc.peer_auth_chunks))) {
7821                                         outchain = sctp_add_auth_chunk(outchain,
7822                                             &endoutchain,
7823                                             &auth,
7824                                             &auth_offset,
7825                                             stcb,
7826                                             chk->rec.chunk_id.id);
7827                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7828                                 }
7829                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7830                                     (int)chk->rec.chunk_id.can_take_data,
7831                                     chk->send_size, chk->copy_by_ref);
7832                                 if (outchain == NULL) {
7833                                         *reason_code = 8;
7834                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7835                                         return (ENOMEM);
7836                                 }
7837                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7838                                 /* update our MTU size */
7839                                 if (mtu > (chk->send_size + omtu))
7840                                         mtu -= (chk->send_size + omtu);
7841                                 else
7842                                         mtu = 0;
7843                                 to_out += (chk->send_size + omtu);
7844                                 /* Do clear IP_DF ? */
7845                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7846                                         no_fragmentflg = 0;
7847                                 }
7848                                 if (chk->rec.chunk_id.can_take_data)
7849                                         chk->data = NULL;
7850                                 /* Mark things to be removed, if needed */
7851                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7852                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7853                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7854                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7855                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7856                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7857                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7858                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7859                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7860                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7861
7862                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7863                                                 hbflag = 1;
7864                                                 /*
7865                                                  * JRS 5/14/07 - Set the
7866                                                  * flag to say a heartbeat
7867                                                  * is being sent.
7868                                                  */
7869                                                 pf_hbflag = 1;
7870                                         }
7871                                         /* remove these chunks at the end */
7872                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7873                                                 /* turn off the timer */
7874                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7875                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7876                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7877                                                 }
7878                                         }
7879                                         ctl_cnt++;
7880                                 } else {
7881                                         /*
7882                                          * Other chunks, since they have
7883                                          * timers running (i.e. COOKIE) we
7884                                          * just "trust" that it gets sent or
7885                                          * retransmitted.
7886                                          */
7887                                         ctl_cnt++;
7888                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7889                                                 cookie = 1;
7890                                                 no_out_cnt = 1;
7891                                         }
7892                                         chk->sent = SCTP_DATAGRAM_SENT;
7893                                         chk->snd_count++;
7894                                 }
7895                                 if (mtu == 0) {
7896                                         /*
7897                                          * Ok we are out of room but we can
7898                                          * output without effecting the
7899                                          * flight size since this little guy
7900                                          * is a control only packet.
7901                                          */
7902                                         if (asconf) {
7903                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7904                                                 /*
7905                                                  * do NOT clear the asconf
7906                                                  * flag as it is used to do
7907                                                  * appropriate source
7908                                                  * address selection.
7909                                                  */
7910                                         }
7911                                         if (cookie) {
7912                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7913                                                 cookie = 0;
7914                                         }
7915                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7916                                         if (outchain == NULL) {
7917                                                 /* no memory */
7918                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7919                                                 error = ENOBUFS;
7920                                                 goto error_out_again;
7921                                         }
7922                                         shdr = mtod(outchain, struct sctphdr *);
7923                                         shdr->src_port = inp->sctp_lport;
7924                                         shdr->dest_port = stcb->rport;
7925                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7926                                         shdr->checksum = 0;
7927                                         auth_offset += sizeof(struct sctphdr);
7928                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7929                                             (struct sockaddr *)&net->ro._l_addr,
7930                                             outchain, auth_offset, auth,
7931                                             no_fragmentflg, 0, NULL, asconf, net->port, so_locked, NULL))) {
7932                                                 if (error == ENOBUFS) {
7933                                                         asoc->ifp_had_enobuf = 1;
7934                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7935                                                 }
7936                                                 if (from_where == 0) {
7937                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7938                                                 }
7939                                 error_out_again:
7940                                                 /* error, could not output */
7941                                                 if (hbflag) {
7942                                                         if (*now_filled == 0) {
7943                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7944                                                                 *now_filled = 1;
7945                                                                 *now = net->last_sent_time;
7946                                                         } else {
7947                                                                 net->last_sent_time = *now;
7948                                                         }
7949                                                         hbflag = 0;
7950                                                 }
7951                                                 if (error == EHOSTUNREACH) {
7952                                                         /*
7953                                                          * Destination went
7954                                                          * unreachable
7955                                                          * during this send
7956                                                          */
7957                                                         sctp_move_to_an_alt(stcb, asoc, net);
7958                                                 }
7959                                                 *reason_code = 7;
7960                                                 continue;
7961                                         } else
7962                                                 asoc->ifp_had_enobuf = 0;
7963                                         /* Only HB or ASCONF advances time */
7964                                         if (hbflag) {
7965                                                 if (*now_filled == 0) {
7966                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7967                                                         *now_filled = 1;
7968                                                         *now = net->last_sent_time;
7969                                                 } else {
7970                                                         net->last_sent_time = *now;
7971                                                 }
7972                                                 hbflag = 0;
7973                                         }
7974                                         /*
7975                                          * increase the number we sent, if a
7976                                          * cookie is sent we don't tell them
7977                                          * any was sent out.
7978                                          */
7979                                         outchain = endoutchain = NULL;
7980                                         auth = NULL;
7981                                         auth_offset = 0;
7982                                         if (!no_out_cnt)
7983                                                 *num_out += ctl_cnt;
7984                                         /* recalc a clean slate and setup */
7985                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7986                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7987                                         } else {
7988                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7989                                         }
7990                                         to_out = 0;
7991                                         no_fragmentflg = 1;
7992                                 }
7993                         }
7994                 }
7995                 /*********************/
7996                 /* Data transmission */
7997                 /*********************/
7998                 /*
7999                  * if AUTH for DATA is required and no AUTH has been added
8000                  * yet, account for this in the mtu now... if no data can be
8001                  * bundled, this adjustment won't matter anyways since the
8002                  * packet will be going out...
8003                  */
8004                 if ((auth == NULL) &&
8005                     sctp_auth_is_required_chunk(SCTP_DATA,
8006                     stcb->asoc.peer_auth_chunks)) {
8007                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8008                 }
8009                 /* now lets add any data within the MTU constraints */
8010                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8011                 case AF_INET:
8012                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8013                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8014                         else
8015                                 omtu = 0;
8016                         break;
8017 #ifdef INET6
8018                 case AF_INET6:
8019                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8020                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8021                         else
8022                                 omtu = 0;
8023                         break;
8024 #endif
8025                 default:
8026                         /* TSNH */
8027                         omtu = 0;
8028                         break;
8029                 }
8030                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) && (skip_data_for_this_net == 0)) ||
8031                     (cookie)) {
8032                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8033                                 if (no_data_chunks) {
8034                                         /* let only control go out */
8035                                         *reason_code = 1;
8036                                         break;
8037                                 }
8038                                 if (net->flight_size >= net->cwnd) {
8039                                         /* skip this net, no room for data */
8040                                         *reason_code = 2;
8041                                         break;
8042                                 }
8043                                 nchk = TAILQ_NEXT(chk, sctp_next);
8044                                 if (chk->whoTo != net) {
8045                                         /* No, not sent to this net */
8046                                         continue;
8047                                 }
8048                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8049                                         /*-
8050                                          * strange, we have a chunk that is
8051                                          * to big for its destination and
8052                                          * yet no fragment ok flag.
8053                                          * Something went wrong when the
8054                                          * PMTU changed...we did not mark
8055                                          * this chunk for some reason?? I
8056                                          * will fix it here by letting IP
8057                                          * fragment it for now and printing
8058                                          * a warning. This really should not
8059                                          * happen ...
8060                                          */
8061                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8062                                             chk->send_size, mtu);
8063                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8064                                 }
8065                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8066                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8067                                         /* ok we will add this one */
8068
8069                                         /*
8070                                          * Add an AUTH chunk, if chunk
8071                                          * requires it, save the offset into
8072                                          * the chain for AUTH
8073                                          */
8074                                         if ((auth == NULL) &&
8075                                             (sctp_auth_is_required_chunk(SCTP_DATA,
8076                                             stcb->asoc.peer_auth_chunks))) {
8077
8078                                                 outchain = sctp_add_auth_chunk(outchain,
8079                                                     &endoutchain,
8080                                                     &auth,
8081                                                     &auth_offset,
8082                                                     stcb,
8083                                                     SCTP_DATA);
8084                                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8085                                         }
8086                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8087                                             chk->send_size, chk->copy_by_ref);
8088                                         if (outchain == NULL) {
8089                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8090                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8091                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8092                                                 }
8093                                                 *reason_code = 3;
8094                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8095                                                 return (ENOMEM);
8096                                         }
8097                                         /* upate our MTU size */
8098                                         /* Do clear IP_DF ? */
8099                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8100                                                 no_fragmentflg = 0;
8101                                         }
8102                                         /* unsigned subtraction of mtu */
8103                                         if (mtu > chk->send_size)
8104                                                 mtu -= chk->send_size;
8105                                         else
8106                                                 mtu = 0;
8107                                         /* unsigned subtraction of r_mtu */
8108                                         if (r_mtu > chk->send_size)
8109                                                 r_mtu -= chk->send_size;
8110                                         else
8111                                                 r_mtu = 0;
8112
8113                                         to_out += chk->send_size;
8114                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8115 #ifdef INVARIANTS
8116                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8117 #else
8118                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8119                                                     mx_mtu, to_out);
8120 #endif
8121                                         }
8122                                         chk->window_probe = 0;
8123                                         data_list[bundle_at++] = chk;
8124                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8125                                                 mtu = 0;
8126                                                 break;
8127                                         }
8128                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8129                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8130                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8131                                                 } else {
8132                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8133                                                 }
8134                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8135                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8136                                                         /*
8137                                                          * Count number of
8138                                                          * user msg's that
8139                                                          * were fragmented
8140                                                          * we do this by
8141                                                          * counting when we
8142                                                          * see a LAST
8143                                                          * fragment only.
8144                                                          */
8145                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8146                                         }
8147                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8148                                                 if (one_chunk) {
8149                                                         data_list[0]->window_probe = 1;
8150                                                         net->window_probe = 1;
8151                                                 }
8152                                                 break;
8153                                         }
8154                                 } else {
8155                                         /*
8156                                          * Must be sent in order of the
8157                                          * TSN's (on a network)
8158                                          */
8159                                         break;
8160                                 }
8161                         }       /* for (chunk gather loop for this net) */
8162                 }               /* if asoc.state OPEN */
8163                 /* Is there something to send for this destination? */
8164                 if (outchain) {
8165                         /* We may need to start a control timer or two */
8166                         if (asconf) {
8167                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8168                                     stcb, net);
8169                                 /*
8170                                  * do NOT clear the asconf flag as it is
8171                                  * used to do appropriate source address
8172                                  * selection.
8173                                  */
8174                         }
8175                         if (cookie) {
8176                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8177                                 cookie = 0;
8178                         }
8179                         /* must start a send timer if data is being sent */
8180                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8181                                 /*
8182                                  * no timer running on this destination
8183                                  * restart it.
8184                                  */
8185                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8186                         } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8187                                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8188                                     pf_hbflag &&
8189                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8190                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8191                                 /*
8192                                  * JRS 5/14/07 - If a HB has been sent to a
8193                                  * PF destination and no T3 timer is
8194                                  * currently running, start the T3 timer to
8195                                  * track the HBs that were sent.
8196                                  */
8197                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8198                         }
8199                         /* Now send it, if there is anything to send :> */
8200                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
8201                         if (outchain == NULL) {
8202                                 /* out of mbufs */
8203                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8204                                 error = ENOBUFS;
8205                                 goto errored_send;
8206                         }
8207                         shdr = mtod(outchain, struct sctphdr *);
8208                         shdr->src_port = inp->sctp_lport;
8209                         shdr->dest_port = stcb->rport;
8210                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8211                         shdr->checksum = 0;
8212                         auth_offset += sizeof(struct sctphdr);
8213                         if ((error = sctp_lowlevel_chunk_output(inp,
8214                             stcb,
8215                             net,
8216                             (struct sockaddr *)&net->ro._l_addr,
8217                             outchain,
8218                             auth_offset,
8219                             auth,
8220                             no_fragmentflg,
8221                             bundle_at,
8222                             data_list[0],
8223                             asconf, net->port, so_locked, NULL))) {
8224                                 /* error, we could not output */
8225                                 if (error == ENOBUFS) {
8226                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8227                                         asoc->ifp_had_enobuf = 1;
8228                                 }
8229                                 if (from_where == 0) {
8230                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8231                                 }
8232                 errored_send:
8233                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8234                                 if (hbflag) {
8235                                         if (*now_filled == 0) {
8236                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8237                                                 *now_filled = 1;
8238                                                 *now = net->last_sent_time;
8239                                         } else {
8240                                                 net->last_sent_time = *now;
8241                                         }
8242                                         hbflag = 0;
8243                                 }
8244                                 if (error == EHOSTUNREACH) {
8245                                         /*
8246                                          * Destination went unreachable
8247                                          * during this send
8248                                          */
8249                                         sctp_move_to_an_alt(stcb, asoc, net);
8250                                 }
8251                                 *reason_code = 6;
8252                                 /*-
8253                                  * I add this line to be paranoid. As far as
8254                                  * I can tell the continue, takes us back to
8255                                  * the top of the for, but just to make sure
8256                                  * I will reset these again here.
8257                                  */
8258                                 ctl_cnt = bundle_at = 0;
8259                                 continue;       /* This takes us back to the
8260                                                  * for() for the nets. */
8261                         } else {
8262                                 asoc->ifp_had_enobuf = 0;
8263                         }
8264                         outchain = endoutchain = NULL;
8265                         auth = NULL;
8266                         auth_offset = 0;
8267                         if (bundle_at || hbflag) {
8268                                 /* For data/asconf and hb set time */
8269                                 if (*now_filled == 0) {
8270                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8271                                         *now_filled = 1;
8272                                         *now = net->last_sent_time;
8273                                 } else {
8274                                         net->last_sent_time = *now;
8275                                 }
8276                         }
8277                         if (!no_out_cnt) {
8278                                 *num_out += (ctl_cnt + bundle_at);
8279                         }
8280                         if (bundle_at) {
8281                                 /* setup for a RTO measurement */
8282                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8283                                 /* fill time if not already filled */
8284                                 if (*now_filled == 0) {
8285                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8286                                         *now_filled = 1;
8287                                         *now = asoc->time_last_sent;
8288                                 } else {
8289                                         asoc->time_last_sent = *now;
8290                                 }
8291                                 data_list[0]->do_rtt = 1;
8292                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8293                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8294                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8295                                         if (net->flight_size < net->cwnd) {
8296                                                 /* start or restart it */
8297                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8298                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8299                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8300                                                 }
8301                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8302                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8303                                         } else {
8304                                                 /* stop it if its running */
8305                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8306                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8307                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8308                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8309                                                 }
8310                                         }
8311                                 }
8312                         }
8313                         if (one_chunk) {
8314                                 break;
8315                         }
8316                 }
8317                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8318                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8319                 }
8320         }
8321         if (old_startat == NULL) {
8322                 old_startat = send_start_at;
8323                 send_start_at = TAILQ_FIRST(&asoc->nets);
8324                 if (old_startat)
8325                         goto again_one_more_time;
8326         }
8327         /*
8328          * At the end there should be no NON timed chunks hanging on this
8329          * queue.
8330          */
8331         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8332                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8333         }
8334         if ((*num_out == 0) && (*reason_code == 0)) {
8335                 *reason_code = 4;
8336         } else {
8337                 *reason_code = 5;
8338         }
8339         sctp_clean_up_ctl(stcb, asoc);
8340         return (0);
8341 }
8342
8343 void
8344 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8345 {
8346         /*-
8347          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8348          * the control chunk queue.
8349          */
8350         struct sctp_chunkhdr *hdr;
8351         struct sctp_tmit_chunk *chk;
8352         struct mbuf *mat;
8353
8354         SCTP_TCB_LOCK_ASSERT(stcb);
8355         sctp_alloc_a_chunk(stcb, chk);
8356         if (chk == NULL) {
8357                 /* no memory */
8358                 sctp_m_freem(op_err);
8359                 return;
8360         }
8361         chk->copy_by_ref = 0;
8362         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8363         if (op_err == NULL) {
8364                 sctp_free_a_chunk(stcb, chk);
8365                 return;
8366         }
8367         chk->send_size = 0;
8368         mat = op_err;
8369         while (mat != NULL) {
8370                 chk->send_size += SCTP_BUF_LEN(mat);
8371                 mat = SCTP_BUF_NEXT(mat);
8372         }
8373         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8374         chk->rec.chunk_id.can_take_data = 1;
8375         chk->sent = SCTP_DATAGRAM_UNSENT;
8376         chk->snd_count = 0;
8377         chk->flags = 0;
8378         chk->asoc = &stcb->asoc;
8379         chk->data = op_err;
8380         chk->whoTo = chk->asoc->primary_destination;
8381         atomic_add_int(&chk->whoTo->ref_count, 1);
8382         hdr = mtod(op_err, struct sctp_chunkhdr *);
8383         hdr->chunk_type = SCTP_OPERATION_ERROR;
8384         hdr->chunk_flags = 0;
8385         hdr->chunk_length = htons(chk->send_size);
8386         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8387             chk,
8388             sctp_next);
8389         chk->asoc->ctrl_queue_cnt++;
8390 }
8391
8392 int
8393 sctp_send_cookie_echo(struct mbuf *m,
8394     int offset,
8395     struct sctp_tcb *stcb,
8396     struct sctp_nets *net)
8397 {
8398         /*-
8399          * pull out the cookie and put it at the front of the control chunk
8400          * queue.
8401          */
8402         int at;
8403         struct mbuf *cookie;
8404         struct sctp_paramhdr parm, *phdr;
8405         struct sctp_chunkhdr *hdr;
8406         struct sctp_tmit_chunk *chk;
8407         uint16_t ptype, plen;
8408
8409         /* First find the cookie in the param area */
8410         cookie = NULL;
8411         at = offset + sizeof(struct sctp_init_chunk);
8412
8413         SCTP_TCB_LOCK_ASSERT(stcb);
8414         do {
8415                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8416                 if (phdr == NULL) {
8417                         return (-3);
8418                 }
8419                 ptype = ntohs(phdr->param_type);
8420                 plen = ntohs(phdr->param_length);
8421                 if (ptype == SCTP_STATE_COOKIE) {
8422                         int pad;
8423
8424                         /* found the cookie */
8425                         if ((pad = (plen % 4))) {
8426                                 plen += 4 - pad;
8427                         }
8428                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8429                         if (cookie == NULL) {
8430                                 /* No memory */
8431                                 return (-2);
8432                         }
8433 #ifdef SCTP_MBUF_LOGGING
8434                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8435                                 struct mbuf *mat;
8436
8437                                 mat = cookie;
8438                                 while (mat) {
8439                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8440                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8441                                         }
8442                                         mat = SCTP_BUF_NEXT(mat);
8443                                 }
8444                         }
8445 #endif
8446                         break;
8447                 }
8448                 at += SCTP_SIZE32(plen);
8449         } while (phdr);
8450         if (cookie == NULL) {
8451                 /* Did not find the cookie */
8452                 return (-3);
8453         }
8454         /* ok, we got the cookie lets change it into a cookie echo chunk */
8455
8456         /* first the change from param to cookie */
8457         hdr = mtod(cookie, struct sctp_chunkhdr *);
8458         hdr->chunk_type = SCTP_COOKIE_ECHO;
8459         hdr->chunk_flags = 0;
8460         /* get the chunk stuff now and place it in the FRONT of the queue */
8461         sctp_alloc_a_chunk(stcb, chk);
8462         if (chk == NULL) {
8463                 /* no memory */
8464                 sctp_m_freem(cookie);
8465                 return (-5);
8466         }
8467         chk->copy_by_ref = 0;
8468         chk->send_size = plen;
8469         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8470         chk->rec.chunk_id.can_take_data = 0;
8471         chk->sent = SCTP_DATAGRAM_UNSENT;
8472         chk->snd_count = 0;
8473         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8474         chk->asoc = &stcb->asoc;
8475         chk->data = cookie;
8476         chk->whoTo = chk->asoc->primary_destination;
8477         atomic_add_int(&chk->whoTo->ref_count, 1);
8478         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8479         chk->asoc->ctrl_queue_cnt++;
8480         return (0);
8481 }
8482
8483 void
8484 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8485     struct mbuf *m,
8486     int offset,
8487     int chk_length,
8488     struct sctp_nets *net)
8489 {
8490         /*
8491          * take a HB request and make it into a HB ack and send it.
8492          */
8493         struct mbuf *outchain;
8494         struct sctp_chunkhdr *chdr;
8495         struct sctp_tmit_chunk *chk;
8496
8497
8498         if (net == NULL)
8499                 /* must have a net pointer */
8500                 return;
8501
8502         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8503         if (outchain == NULL) {
8504                 /* gak out of memory */
8505                 return;
8506         }
8507 #ifdef SCTP_MBUF_LOGGING
8508         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8509                 struct mbuf *mat;
8510
8511                 mat = outchain;
8512                 while (mat) {
8513                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8514                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8515                         }
8516                         mat = SCTP_BUF_NEXT(mat);
8517                 }
8518         }
8519 #endif
8520         chdr = mtod(outchain, struct sctp_chunkhdr *);
8521         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8522         chdr->chunk_flags = 0;
8523         if (chk_length % 4) {
8524                 /* need pad */
8525                 uint32_t cpthis = 0;
8526                 int padlen;
8527
8528                 padlen = 4 - (chk_length % 4);
8529                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8530         }
8531         sctp_alloc_a_chunk(stcb, chk);
8532         if (chk == NULL) {
8533                 /* no memory */
8534                 sctp_m_freem(outchain);
8535                 return;
8536         }
8537         chk->copy_by_ref = 0;
8538         chk->send_size = chk_length;
8539         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8540         chk->rec.chunk_id.can_take_data = 1;
8541         chk->sent = SCTP_DATAGRAM_UNSENT;
8542         chk->snd_count = 0;
8543         chk->flags = 0;
8544         chk->asoc = &stcb->asoc;
8545         chk->data = outchain;
8546         chk->whoTo = net;
8547         atomic_add_int(&chk->whoTo->ref_count, 1);
8548         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8549         chk->asoc->ctrl_queue_cnt++;
8550 }
8551
8552 void
8553 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8554 {
8555         /* formulate and queue a cookie-ack back to sender */
8556         struct mbuf *cookie_ack;
8557         struct sctp_chunkhdr *hdr;
8558         struct sctp_tmit_chunk *chk;
8559
8560         cookie_ack = NULL;
8561         SCTP_TCB_LOCK_ASSERT(stcb);
8562
8563         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8564         if (cookie_ack == NULL) {
8565                 /* no mbuf's */
8566                 return;
8567         }
8568         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8569         sctp_alloc_a_chunk(stcb, chk);
8570         if (chk == NULL) {
8571                 /* no memory */
8572                 sctp_m_freem(cookie_ack);
8573                 return;
8574         }
8575         chk->copy_by_ref = 0;
8576         chk->send_size = sizeof(struct sctp_chunkhdr);
8577         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8578         chk->rec.chunk_id.can_take_data = 1;
8579         chk->sent = SCTP_DATAGRAM_UNSENT;
8580         chk->snd_count = 0;
8581         chk->flags = 0;
8582         chk->asoc = &stcb->asoc;
8583         chk->data = cookie_ack;
8584         if (chk->asoc->last_control_chunk_from != NULL) {
8585                 chk->whoTo = chk->asoc->last_control_chunk_from;
8586         } else {
8587                 chk->whoTo = chk->asoc->primary_destination;
8588         }
8589         atomic_add_int(&chk->whoTo->ref_count, 1);
8590         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8591         hdr->chunk_type = SCTP_COOKIE_ACK;
8592         hdr->chunk_flags = 0;
8593         hdr->chunk_length = htons(chk->send_size);
8594         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8595         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8596         chk->asoc->ctrl_queue_cnt++;
8597         return;
8598 }
8599
8600
8601 void
8602 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8603 {
8604         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8605         struct mbuf *m_shutdown_ack;
8606         struct sctp_shutdown_ack_chunk *ack_cp;
8607         struct sctp_tmit_chunk *chk;
8608
8609         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8610         if (m_shutdown_ack == NULL) {
8611                 /* no mbuf's */
8612                 return;
8613         }
8614         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8615         sctp_alloc_a_chunk(stcb, chk);
8616         if (chk == NULL) {
8617                 /* no memory */
8618                 sctp_m_freem(m_shutdown_ack);
8619                 return;
8620         }
8621         chk->copy_by_ref = 0;
8622         chk->send_size = sizeof(struct sctp_chunkhdr);
8623         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8624         chk->rec.chunk_id.can_take_data = 1;
8625         chk->sent = SCTP_DATAGRAM_UNSENT;
8626         chk->snd_count = 0;
8627         chk->flags = 0;
8628         chk->asoc = &stcb->asoc;
8629         chk->data = m_shutdown_ack;
8630         chk->whoTo = net;
8631         atomic_add_int(&net->ref_count, 1);
8632
8633         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8634         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8635         ack_cp->ch.chunk_flags = 0;
8636         ack_cp->ch.chunk_length = htons(chk->send_size);
8637         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8638         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8639         chk->asoc->ctrl_queue_cnt++;
8640         return;
8641 }
8642
8643 void
8644 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8645 {
8646         /* formulate and queue a SHUTDOWN to the sender */
8647         struct mbuf *m_shutdown;
8648         struct sctp_shutdown_chunk *shutdown_cp;
8649         struct sctp_tmit_chunk *chk;
8650
8651         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8652         if (m_shutdown == NULL) {
8653                 /* no mbuf's */
8654                 return;
8655         }
8656         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8657         sctp_alloc_a_chunk(stcb, chk);
8658         if (chk == NULL) {
8659                 /* no memory */
8660                 sctp_m_freem(m_shutdown);
8661                 return;
8662         }
8663         chk->copy_by_ref = 0;
8664         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8665         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8666         chk->rec.chunk_id.can_take_data = 1;
8667         chk->sent = SCTP_DATAGRAM_UNSENT;
8668         chk->snd_count = 0;
8669         chk->flags = 0;
8670         chk->asoc = &stcb->asoc;
8671         chk->data = m_shutdown;
8672         chk->whoTo = net;
8673         atomic_add_int(&net->ref_count, 1);
8674
8675         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8676         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8677         shutdown_cp->ch.chunk_flags = 0;
8678         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8679         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8680         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8681         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8682         chk->asoc->ctrl_queue_cnt++;
8683         return;
8684 }
8685
8686 void
8687 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8688 {
8689         /*
8690          * formulate and queue an ASCONF to the peer. ASCONF parameters
8691          * should be queued on the assoc queue.
8692          */
8693         struct sctp_tmit_chunk *chk;
8694         struct mbuf *m_asconf;
8695         int len;
8696
8697         SCTP_TCB_LOCK_ASSERT(stcb);
8698
8699         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8700             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8701                 /* can't send a new one if there is one in flight already */
8702                 return;
8703         }
8704         /* compose an ASCONF chunk, maximum length is PMTU */
8705         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8706         if (m_asconf == NULL) {
8707                 return;
8708         }
8709         sctp_alloc_a_chunk(stcb, chk);
8710         if (chk == NULL) {
8711                 /* no memory */
8712                 sctp_m_freem(m_asconf);
8713                 return;
8714         }
8715         chk->copy_by_ref = 0;
8716         chk->data = m_asconf;
8717         chk->send_size = len;
8718         chk->rec.chunk_id.id = SCTP_ASCONF;
8719         chk->rec.chunk_id.can_take_data = 0;
8720         chk->sent = SCTP_DATAGRAM_UNSENT;
8721         chk->snd_count = 0;
8722         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8723         chk->asoc = &stcb->asoc;
8724         chk->whoTo = net;
8725         atomic_add_int(&chk->whoTo->ref_count, 1);
8726         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8727         chk->asoc->ctrl_queue_cnt++;
8728         return;
8729 }
8730
8731 void
8732 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8733 {
8734         /*
8735          * formulate and queue a asconf-ack back to sender. the asconf-ack
8736          * must be stored in the tcb.
8737          */
8738         struct sctp_tmit_chunk *chk;
8739         struct sctp_asconf_ack *ack, *latest_ack;
8740         struct mbuf *m_ack, *m;
8741         struct sctp_nets *net = NULL;
8742
8743         SCTP_TCB_LOCK_ASSERT(stcb);
8744         /* Get the latest ASCONF-ACK */
8745         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8746         if (latest_ack == NULL) {
8747                 return;
8748         }
8749         if (latest_ack->last_sent_to != NULL &&
8750             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8751                 /* we're doing a retransmission */
8752                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8753                 if (net == NULL) {
8754                         /* no alternate */
8755                         if (stcb->asoc.last_control_chunk_from == NULL)
8756                                 net = stcb->asoc.primary_destination;
8757                         else
8758                                 net = stcb->asoc.last_control_chunk_from;
8759                 }
8760         } else {
8761                 /* normal case */
8762                 if (stcb->asoc.last_control_chunk_from == NULL)
8763                         net = stcb->asoc.primary_destination;
8764                 else
8765                         net = stcb->asoc.last_control_chunk_from;
8766         }
8767         latest_ack->last_sent_to = net;
8768
8769         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8770                 if (ack->data == NULL) {
8771                         continue;
8772                 }
8773                 /* copy the asconf_ack */
8774                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8775                 if (m_ack == NULL) {
8776                         /* couldn't copy it */
8777                         return;
8778                 }
8779 #ifdef SCTP_MBUF_LOGGING
8780                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8781                         struct mbuf *mat;
8782
8783                         mat = m_ack;
8784                         while (mat) {
8785                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8786                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8787                                 }
8788                                 mat = SCTP_BUF_NEXT(mat);
8789                         }
8790                 }
8791 #endif
8792
8793                 sctp_alloc_a_chunk(stcb, chk);
8794                 if (chk == NULL) {
8795                         /* no memory */
8796                         if (m_ack)
8797                                 sctp_m_freem(m_ack);
8798                         return;
8799                 }
8800                 chk->copy_by_ref = 0;
8801
8802                 chk->whoTo = net;
8803                 chk->data = m_ack;
8804                 chk->send_size = 0;
8805                 /* Get size */
8806                 m = m_ack;
8807                 chk->send_size = ack->len;
8808                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8809                 chk->rec.chunk_id.can_take_data = 1;
8810                 chk->sent = SCTP_DATAGRAM_UNSENT;
8811                 chk->snd_count = 0;
8812                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8813                 chk->asoc = &stcb->asoc;
8814                 atomic_add_int(&chk->whoTo->ref_count, 1);
8815
8816                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8817                 chk->asoc->ctrl_queue_cnt++;
8818         }
8819         return;
8820 }
8821
8822
8823 static int
8824 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8825     struct sctp_tcb *stcb,
8826     struct sctp_association *asoc,
8827     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8828 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8829     SCTP_UNUSED
8830 #endif
8831 )
8832 {
8833         /*-
8834          * send out one MTU of retransmission. If fast_retransmit is
8835          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8836          * rwnd. For a Cookie or Asconf in the control chunk queue we
8837          * retransmit them by themselves.
8838          *
8839          * For data chunks we will pick out the lowest TSN's in the sent_queue
8840          * marked for resend and bundle them all together (up to a MTU of
8841          * destination). The address to send to should have been
8842          * selected/changed where the retransmission was marked (i.e. in FR
8843          * or t3-timeout routines).
8844          */
8845         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8846         struct sctp_tmit_chunk *chk, *fwd;
8847         struct mbuf *m, *endofchain;
8848         struct sctphdr *shdr;
8849         struct sctp_nets *net = NULL;
8850         uint32_t tsns_sent = 0;
8851         int no_fragmentflg, bundle_at, cnt_thru;
8852         unsigned int mtu;
8853         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8854         struct sctp_auth_chunk *auth = NULL;
8855         uint32_t auth_offset = 0;
8856         uint32_t dmtu = 0;
8857
8858         SCTP_TCB_LOCK_ASSERT(stcb);
8859         tmr_started = ctl_cnt = bundle_at = error = 0;
8860         no_fragmentflg = 1;
8861         fwd_tsn = 0;
8862         *cnt_out = 0;
8863         fwd = NULL;
8864         endofchain = m = NULL;
8865 #ifdef SCTP_AUDITING_ENABLED
8866         sctp_audit_log(0xC3, 1);
8867 #endif
8868         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8869             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8870                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8871                     asoc->sent_queue_retran_cnt);
8872                 asoc->sent_queue_cnt = 0;
8873                 asoc->sent_queue_cnt_removeable = 0;
8874                 /* send back 0/0 so we enter normal transmission */
8875                 *cnt_out = 0;
8876                 return (0);
8877         }
8878         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8879                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8880                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8881                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8882                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8883                                 if (chk != asoc->str_reset) {
8884                                         /*
8885                                          * not eligible for retran if its
8886                                          * not ours
8887                                          */
8888                                         continue;
8889                                 }
8890                         }
8891                         ctl_cnt++;
8892                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8893                                 fwd_tsn = 1;
8894                                 fwd = chk;
8895                         }
8896                         /*
8897                          * Add an AUTH chunk, if chunk requires it save the
8898                          * offset into the chain for AUTH
8899                          */
8900                         if ((auth == NULL) &&
8901                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8902                             stcb->asoc.peer_auth_chunks))) {
8903                                 m = sctp_add_auth_chunk(m, &endofchain,
8904                                     &auth, &auth_offset,
8905                                     stcb,
8906                                     chk->rec.chunk_id.id);
8907                         }
8908                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8909                         break;
8910                 }
8911         }
8912         one_chunk = 0;
8913         cnt_thru = 0;
8914         /* do we have control chunks to retransmit? */
8915         if (m != NULL) {
8916                 /* Start a timer no matter if we suceed or fail */
8917                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8918                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8919                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8920                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8921
8922                 SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
8923                 if (m == NULL) {
8924                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8925                         return (ENOBUFS);
8926                 }
8927                 shdr = mtod(m, struct sctphdr *);
8928                 shdr->src_port = inp->sctp_lport;
8929                 shdr->dest_port = stcb->rport;
8930                 shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8931                 shdr->checksum = 0;
8932                 auth_offset += sizeof(struct sctphdr);
8933                 chk->snd_count++;       /* update our count */
8934
8935                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8936                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m, auth_offset,
8937                     auth, no_fragmentflg, 0, NULL, 0, chk->whoTo->port, so_locked, NULL))) {
8938                         SCTP_STAT_INCR(sctps_lowlevelerr);
8939                         return (error);
8940                 }
8941                 m = endofchain = NULL;
8942                 auth = NULL;
8943                 auth_offset = 0;
8944                 /*
8945                  * We don't want to mark the net->sent time here since this
8946                  * we use this for HB and retrans cannot measure RTT
8947                  */
8948                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8949                 *cnt_out += 1;
8950                 chk->sent = SCTP_DATAGRAM_SENT;
8951                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8952                 if (fwd_tsn == 0) {
8953                         return (0);
8954                 } else {
8955                         /* Clean up the fwd-tsn list */
8956                         sctp_clean_up_ctl(stcb, asoc);
8957                         return (0);
8958                 }
8959         }
8960         /*
8961          * Ok, it is just data retransmission we need to do or that and a
8962          * fwd-tsn with it all.
8963          */
8964         if (TAILQ_EMPTY(&asoc->sent_queue)) {
8965                 return (SCTP_RETRAN_DONE);
8966         }
8967         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
8968             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
8969                 /* not yet open, resend the cookie and that is it */
8970                 return (1);
8971         }
8972 #ifdef SCTP_AUDITING_ENABLED
8973         sctp_auditing(20, inp, stcb, NULL);
8974 #endif
8975         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
8976                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
8977                         /* No, not sent to this net or not ready for rtx */
8978                         continue;
8979                 }
8980                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
8981                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
8982                         /* Gak, we have exceeded max unlucky retran, abort! */
8983                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
8984                             chk->snd_count,
8985                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
8986                         atomic_add_int(&stcb->asoc.refcnt, 1);
8987                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
8988                         SCTP_TCB_LOCK(stcb);
8989                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
8990                         return (SCTP_RETRAN_EXIT);
8991                 }
8992                 /* pick up the net */
8993                 net = chk->whoTo;
8994                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8995                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8996                 } else {
8997                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8998                 }
8999
9000                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9001                         /* No room in peers rwnd */
9002                         uint32_t tsn;
9003
9004                         tsn = asoc->last_acked_seq + 1;
9005                         if (tsn == chk->rec.data.TSN_seq) {
9006                                 /*
9007                                  * we make a special exception for this
9008                                  * case. The peer has no rwnd but is missing
9009                                  * the lowest chunk.. which is probably what
9010                                  * is holding up the rwnd.
9011                                  */
9012                                 goto one_chunk_around;
9013                         }
9014                         return (1);
9015                 }
9016 one_chunk_around:
9017                 if (asoc->peers_rwnd < mtu) {
9018                         one_chunk = 1;
9019                         if ((asoc->peers_rwnd == 0) &&
9020                             (asoc->total_flight == 0)) {
9021                                 chk->window_probe = 1;
9022                                 chk->whoTo->window_probe = 1;
9023                         }
9024                 }
9025 #ifdef SCTP_AUDITING_ENABLED
9026                 sctp_audit_log(0xC3, 2);
9027 #endif
9028                 bundle_at = 0;
9029                 m = NULL;
9030                 net->fast_retran_ip = 0;
9031                 if (chk->rec.data.doing_fast_retransmit == 0) {
9032                         /*
9033                          * if no FR in progress skip destination that have
9034                          * flight_size > cwnd.
9035                          */
9036                         if (net->flight_size >= net->cwnd) {
9037                                 continue;
9038                         }
9039                 } else {
9040                         /*
9041                          * Mark the destination net to have FR recovery
9042                          * limits put on it.
9043                          */
9044                         *fr_done = 1;
9045                         net->fast_retran_ip = 1;
9046                 }
9047
9048                 /*
9049                  * if no AUTH is yet included and this chunk requires it,
9050                  * make sure to account for it.  We don't apply the size
9051                  * until the AUTH chunk is actually added below in case
9052                  * there is no room for this chunk.
9053                  */
9054                 if ((auth == NULL) &&
9055                     sctp_auth_is_required_chunk(SCTP_DATA,
9056                     stcb->asoc.peer_auth_chunks)) {
9057                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9058                 } else
9059                         dmtu = 0;
9060
9061                 if ((chk->send_size <= (mtu - dmtu)) ||
9062                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9063                         /* ok we will add this one */
9064                         if ((auth == NULL) &&
9065                             (sctp_auth_is_required_chunk(SCTP_DATA,
9066                             stcb->asoc.peer_auth_chunks))) {
9067                                 m = sctp_add_auth_chunk(m, &endofchain,
9068                                     &auth, &auth_offset,
9069                                     stcb, SCTP_DATA);
9070                         }
9071                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9072                         if (m == NULL) {
9073                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9074                                 return (ENOMEM);
9075                         }
9076                         /* Do clear IP_DF ? */
9077                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9078                                 no_fragmentflg = 0;
9079                         }
9080                         /* upate our MTU size */
9081                         if (mtu > (chk->send_size + dmtu))
9082                                 mtu -= (chk->send_size + dmtu);
9083                         else
9084                                 mtu = 0;
9085                         data_list[bundle_at++] = chk;
9086                         if (one_chunk && (asoc->total_flight <= 0)) {
9087                                 SCTP_STAT_INCR(sctps_windowprobed);
9088                         }
9089                 }
9090                 if (one_chunk == 0) {
9091                         /*
9092                          * now are there anymore forward from chk to pick
9093                          * up?
9094                          */
9095                         fwd = TAILQ_NEXT(chk, sctp_next);
9096                         while (fwd) {
9097                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9098                                         /* Nope, not for retran */
9099                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9100                                         continue;
9101                                 }
9102                                 if (fwd->whoTo != net) {
9103                                         /* Nope, not the net in question */
9104                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9105                                         continue;
9106                                 }
9107                                 if ((auth == NULL) &&
9108                                     sctp_auth_is_required_chunk(SCTP_DATA,
9109                                     stcb->asoc.peer_auth_chunks)) {
9110                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9111                                 } else
9112                                         dmtu = 0;
9113                                 if (fwd->send_size <= (mtu - dmtu)) {
9114                                         if ((auth == NULL) &&
9115                                             (sctp_auth_is_required_chunk(SCTP_DATA,
9116                                             stcb->asoc.peer_auth_chunks))) {
9117                                                 m = sctp_add_auth_chunk(m,
9118                                                     &endofchain,
9119                                                     &auth, &auth_offset,
9120                                                     stcb,
9121                                                     SCTP_DATA);
9122                                         }
9123                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9124                                         if (m == NULL) {
9125                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9126                                                 return (ENOMEM);
9127                                         }
9128                                         /* Do clear IP_DF ? */
9129                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9130                                                 no_fragmentflg = 0;
9131                                         }
9132                                         /* upate our MTU size */
9133                                         if (mtu > (fwd->send_size + dmtu))
9134                                                 mtu -= (fwd->send_size + dmtu);
9135                                         else
9136                                                 mtu = 0;
9137                                         data_list[bundle_at++] = fwd;
9138                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9139                                                 break;
9140                                         }
9141                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9142                                 } else {
9143                                         /* can't fit so we are done */
9144                                         break;
9145                                 }
9146                         }
9147                 }
9148                 /* Is there something to send for this destination? */
9149                 if (m) {
9150                         /*
9151                          * No matter if we fail/or suceed we should start a
9152                          * timer. A failure is like a lost IP packet :-)
9153                          */
9154                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9155                                 /*
9156                                  * no timer running on this destination
9157                                  * restart it.
9158                                  */
9159                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9160                                 tmr_started = 1;
9161                         }
9162                         SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
9163                         if (m == NULL) {
9164                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
9165                                 return (ENOBUFS);
9166                         }
9167                         shdr = mtod(m, struct sctphdr *);
9168                         shdr->src_port = inp->sctp_lport;
9169                         shdr->dest_port = stcb->rport;
9170                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
9171                         shdr->checksum = 0;
9172                         auth_offset += sizeof(struct sctphdr);
9173                         /* Now lets send it, if there is anything to send :> */
9174                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9175                             (struct sockaddr *)&net->ro._l_addr, m, auth_offset,
9176                             auth, no_fragmentflg, 0, NULL, 0, net->port, so_locked, NULL))) {
9177                                 /* error, we could not output */
9178                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9179                                 return (error);
9180                         }
9181                         m = endofchain = NULL;
9182                         auth = NULL;
9183                         auth_offset = 0;
9184                         /* For HB's */
9185                         /*
9186                          * We don't want to mark the net->sent time here
9187                          * since this we use this for HB and retrans cannot
9188                          * measure RTT
9189                          */
9190                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9191
9192                         /* For auto-close */
9193                         cnt_thru++;
9194                         if (*now_filled == 0) {
9195                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9196                                 *now = asoc->time_last_sent;
9197                                 *now_filled = 1;
9198                         } else {
9199                                 asoc->time_last_sent = *now;
9200                         }
9201                         *cnt_out += bundle_at;
9202 #ifdef SCTP_AUDITING_ENABLED
9203                         sctp_audit_log(0xC4, bundle_at);
9204 #endif
9205                         if (bundle_at) {
9206                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9207                         }
9208                         for (i = 0; i < bundle_at; i++) {
9209                                 SCTP_STAT_INCR(sctps_sendretransdata);
9210                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9211                                 /*
9212                                  * When we have a revoked data, and we
9213                                  * retransmit it, then we clear the revoked
9214                                  * flag since this flag dictates if we
9215                                  * subtracted from the fs
9216                                  */
9217                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9218                                         /* Deflate the cwnd */
9219                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9220                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9221                                 }
9222                                 data_list[i]->snd_count++;
9223                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9224                                 /* record the time */
9225                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9226                                 if (data_list[i]->book_size_scale) {
9227                                         /*
9228                                          * need to double the book size on
9229                                          * this one
9230                                          */
9231                                         data_list[i]->book_size_scale = 0;
9232                                         /*
9233                                          * Since we double the booksize, we
9234                                          * must also double the output queue
9235                                          * size, since this get shrunk when
9236                                          * we free by this amount.
9237                                          */
9238                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9239                                         data_list[i]->book_size *= 2;
9240
9241
9242                                 } else {
9243                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9244                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9245                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9246                                         }
9247                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9248                                             (uint32_t) (data_list[i]->send_size +
9249                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9250                                 }
9251                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9252                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9253                                             data_list[i]->whoTo->flight_size,
9254                                             data_list[i]->book_size,
9255                                             (uintptr_t) data_list[i]->whoTo,
9256                                             data_list[i]->rec.data.TSN_seq);
9257                                 }
9258                                 sctp_flight_size_increase(data_list[i]);
9259                                 sctp_total_flight_increase(stcb, data_list[i]);
9260                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9261                                         /* SWS sender side engages */
9262                                         asoc->peers_rwnd = 0;
9263                                 }
9264                                 if ((i == 0) &&
9265                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9266                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9267                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9268                                             (tmr_started == 0)) {
9269                                                 /*-
9270                                                  * ok we just fast-retrans'd
9271                                                  * the lowest TSN, i.e the
9272                                                  * first on the list. In
9273                                                  * this case we want to give
9274                                                  * some more time to get a
9275                                                  * SACK back without a
9276                                                  * t3-expiring.
9277                                                  */
9278                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9279                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9280                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9281                                         }
9282                                 }
9283                         }
9284                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9285                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9286                         }
9287 #ifdef SCTP_AUDITING_ENABLED
9288                         sctp_auditing(21, inp, stcb, NULL);
9289 #endif
9290                 } else {
9291                         /* None will fit */
9292                         return (1);
9293                 }
9294                 if (asoc->sent_queue_retran_cnt <= 0) {
9295                         /* all done we have no more to retran */
9296                         asoc->sent_queue_retran_cnt = 0;
9297                         break;
9298                 }
9299                 if (one_chunk) {
9300                         /* No more room in rwnd */
9301                         return (1);
9302                 }
9303                 /* stop the for loop here. we sent out a packet */
9304                 break;
9305         }
9306         return (0);
9307 }
9308
9309
9310 static int
9311 sctp_timer_validation(struct sctp_inpcb *inp,
9312     struct sctp_tcb *stcb,
9313     struct sctp_association *asoc,
9314     int ret)
9315 {
9316         struct sctp_nets *net;
9317
9318         /* Validate that a timer is running somewhere */
9319         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9320                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9321                         /* Here is a timer */
9322                         return (ret);
9323                 }
9324         }
9325         SCTP_TCB_LOCK_ASSERT(stcb);
9326         /* Gak, we did not have a timer somewhere */
9327         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9328         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9329         return (ret);
9330 }
9331
9332 void
9333 sctp_chunk_output(struct sctp_inpcb *inp,
9334     struct sctp_tcb *stcb,
9335     int from_where,
9336     int so_locked
9337 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9338     SCTP_UNUSED
9339 #endif
9340 )
9341 {
9342         /*-
9343          * Ok this is the generic chunk service queue. we must do the
9344          * following:
9345          * - See if there are retransmits pending, if so we must
9346          *   do these first.
9347          * - Service the stream queue that is next, moving any
9348          *   message (note I must get a complete message i.e.
9349          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9350          *   TSN's
9351          * - Check to see if the cwnd/rwnd allows any output, if so we
9352          *   go ahead and fomulate and send the low level chunks. Making sure
9353          *   to combine any control in the control chunk queue also.
9354          */
9355         struct sctp_association *asoc;
9356         struct sctp_nets *net;
9357         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9358             burst_cnt = 0, burst_limit = 0;
9359         struct timeval now;
9360         int now_filled = 0;
9361         int cwnd_full = 0;
9362         int nagle_on = 0;
9363         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9364         int un_sent = 0;
9365         int fr_done, tot_frs = 0;
9366
9367         asoc = &stcb->asoc;
9368         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9369                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9370                         nagle_on = 0;
9371                 } else {
9372                         nagle_on = 1;
9373                 }
9374         }
9375         SCTP_TCB_LOCK_ASSERT(stcb);
9376
9377         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9378
9379         if ((un_sent <= 0) &&
9380             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9381             (asoc->sent_queue_retran_cnt == 0)) {
9382                 /* Nothing to do unless there is something to be sent left */
9383                 return;
9384         }
9385         /*
9386          * Do we have something to send, data or control AND a sack timer
9387          * running, if so piggy-back the sack.
9388          */
9389         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9390                 sctp_send_sack(stcb);
9391                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9392         }
9393         while (asoc->sent_queue_retran_cnt) {
9394                 /*-
9395                  * Ok, it is retransmission time only, we send out only ONE
9396                  * packet with a single call off to the retran code.
9397                  */
9398                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9399                         /*-
9400                          * Special hook for handling cookiess discarded
9401                          * by peer that carried data. Send cookie-ack only
9402                          * and then the next call with get the retran's.
9403                          */
9404                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9405                             &cwnd_full, from_where,
9406                             &now, &now_filled, frag_point, so_locked);
9407                         return;
9408                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9409                         /* if its not from a HB then do it */
9410                         fr_done = 0;
9411                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9412                         if (fr_done) {
9413                                 tot_frs++;
9414                         }
9415                 } else {
9416                         /*
9417                          * its from any other place, we don't allow retran
9418                          * output (only control)
9419                          */
9420                         ret = 1;
9421                 }
9422                 if (ret > 0) {
9423                         /* Can't send anymore */
9424                         /*-
9425                          * now lets push out control by calling med-level
9426                          * output once. this assures that we WILL send HB's
9427                          * if queued too.
9428                          */
9429                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9430                             &cwnd_full, from_where,
9431                             &now, &now_filled, frag_point, so_locked);
9432 #ifdef SCTP_AUDITING_ENABLED
9433                         sctp_auditing(8, inp, stcb, NULL);
9434 #endif
9435                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9436                         return;
9437                 }
9438                 if (ret < 0) {
9439                         /*-
9440                          * The count was off.. retran is not happening so do
9441                          * the normal retransmission.
9442                          */
9443 #ifdef SCTP_AUDITING_ENABLED
9444                         sctp_auditing(9, inp, stcb, NULL);
9445 #endif
9446                         if (ret == SCTP_RETRAN_EXIT) {
9447                                 return;
9448                         }
9449                         break;
9450                 }
9451                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9452                         /* Only one transmission allowed out of a timeout */
9453 #ifdef SCTP_AUDITING_ENABLED
9454                         sctp_auditing(10, inp, stcb, NULL);
9455 #endif
9456                         /* Push out any control */
9457                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
9458                             &now, &now_filled, frag_point, so_locked);
9459                         return;
9460                 }
9461                 if (tot_frs > asoc->max_burst) {
9462                         /* Hit FR burst limit */
9463                         return;
9464                 }
9465                 if ((num_out == 0) && (ret == 0)) {
9466
9467                         /* No more retrans to send */
9468                         break;
9469                 }
9470         }
9471 #ifdef SCTP_AUDITING_ENABLED
9472         sctp_auditing(12, inp, stcb, NULL);
9473 #endif
9474         /* Check for bad destinations, if they exist move chunks around. */
9475         burst_limit = asoc->max_burst;
9476         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9477                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9478                     SCTP_ADDR_NOT_REACHABLE) {
9479                         /*-
9480                          * if possible move things off of this address we
9481                          * still may send below due to the dormant state but
9482                          * we try to find an alternate address to send to
9483                          * and if we have one we move all queued data on the
9484                          * out wheel to this alternate address.
9485                          */
9486                         if (net->ref_count > 1)
9487                                 sctp_move_to_an_alt(stcb, asoc, net);
9488                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
9489                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
9490                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9491                         /*
9492                          * JRS 5/14/07 - If CMT PF is on and the current
9493                          * destination is in PF state, move all queued data
9494                          * to an alternate desination.
9495                          */
9496                         if (net->ref_count > 1)
9497                                 sctp_move_to_an_alt(stcb, asoc, net);
9498                 } else {
9499                         /*-
9500                          * if ((asoc->sat_network) || (net->addr_is_local))
9501                          * { burst_limit = asoc->max_burst *
9502                          * SCTP_SAT_NETWORK_BURST_INCR; }
9503                          */
9504                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9505                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9506                                         /*
9507                                          * JRS - Use the congestion control
9508                                          * given in the congestion control
9509                                          * module
9510                                          */
9511                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9512                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9513                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9514                                         }
9515                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9516                                 }
9517                                 net->fast_retran_ip = 0;
9518                         } else {
9519                                 if (net->flight_size == 0) {
9520                                         /* Should be decaying the cwnd here */
9521                                         ;
9522                                 }
9523                         }
9524                 }
9525
9526         }
9527         burst_cnt = 0;
9528         cwnd_full = 0;
9529         do {
9530                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9531                     &reason_code, 0, &cwnd_full, from_where,
9532                     &now, &now_filled, frag_point, so_locked);
9533                 if (error) {
9534                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9535                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9536                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9537                         }
9538                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9539                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9540                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9541                         }
9542                         break;
9543                 }
9544                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9545
9546                 tot_out += num_out;
9547                 burst_cnt++;
9548                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9549                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9550                         if (num_out == 0) {
9551                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9552                         }
9553                 }
9554                 if (nagle_on) {
9555                         /*-
9556                          * When nagle is on, we look at how much is un_sent, then
9557                          * if its smaller than an MTU and we have data in
9558                          * flight we stop.
9559                          */
9560                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9561                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9562                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9563                             (stcb->asoc.total_flight > 0)) {
9564                                 break;
9565                         }
9566                 }
9567                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9568                     TAILQ_EMPTY(&asoc->send_queue) &&
9569                     TAILQ_EMPTY(&asoc->out_wheel)) {
9570                         /* Nothing left to send */
9571                         break;
9572                 }
9573                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9574                         /* Nothing left to send */
9575                         break;
9576                 }
9577         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9578             (burst_cnt < burst_limit)));
9579
9580         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9581                 if (burst_cnt >= burst_limit) {
9582                         SCTP_STAT_INCR(sctps_maxburstqueued);
9583                         asoc->burst_limit_applied = 1;
9584                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9585                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9586                         }
9587                 } else {
9588                         asoc->burst_limit_applied = 0;
9589                 }
9590         }
9591         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9592                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9593         }
9594         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9595             tot_out);
9596
9597         /*-
9598          * Now we need to clean up the control chunk chain if a ECNE is on
9599          * it. It must be marked as UNSENT again so next call will continue
9600          * to send it until such time that we get a CWR, to remove it.
9601          */
9602         if (stcb->asoc.ecn_echo_cnt_onq)
9603                 sctp_fix_ecn_echo(asoc);
9604         return;
9605 }
9606
9607
9608 int
9609 sctp_output(inp, m, addr, control, p, flags)
9610         struct sctp_inpcb *inp;
9611         struct mbuf *m;
9612         struct sockaddr *addr;
9613         struct mbuf *control;
9614         struct thread *p;
9615         int flags;
9616 {
9617         if (inp == NULL) {
9618                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9619                 return (EINVAL);
9620         }
9621         if (inp->sctp_socket == NULL) {
9622                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9623                 return (EINVAL);
9624         }
9625         return (sctp_sosend(inp->sctp_socket,
9626             addr,
9627             (struct uio *)NULL,
9628             m,
9629             control,
9630             flags, p
9631             ));
9632 }
9633
9634 void
9635 send_forward_tsn(struct sctp_tcb *stcb,
9636     struct sctp_association *asoc)
9637 {
9638         struct sctp_tmit_chunk *chk;
9639         struct sctp_forward_tsn_chunk *fwdtsn;
9640
9641         SCTP_TCB_LOCK_ASSERT(stcb);
9642         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9643                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9644                         /* mark it to unsent */
9645                         chk->sent = SCTP_DATAGRAM_UNSENT;
9646                         chk->snd_count = 0;
9647                         /* Do we correct its output location? */
9648                         if (chk->whoTo != asoc->primary_destination) {
9649                                 sctp_free_remote_addr(chk->whoTo);
9650                                 chk->whoTo = asoc->primary_destination;
9651                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9652                         }
9653                         goto sctp_fill_in_rest;
9654                 }
9655         }
9656         /* Ok if we reach here we must build one */
9657         sctp_alloc_a_chunk(stcb, chk);
9658         if (chk == NULL) {
9659                 return;
9660         }
9661         chk->copy_by_ref = 0;
9662         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9663         chk->rec.chunk_id.can_take_data = 0;
9664         chk->asoc = asoc;
9665         chk->whoTo = NULL;
9666
9667         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9668         if (chk->data == NULL) {
9669                 sctp_free_a_chunk(stcb, chk);
9670                 return;
9671         }
9672         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9673         chk->sent = SCTP_DATAGRAM_UNSENT;
9674         chk->snd_count = 0;
9675         chk->whoTo = asoc->primary_destination;
9676         atomic_add_int(&chk->whoTo->ref_count, 1);
9677         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9678         asoc->ctrl_queue_cnt++;
9679 sctp_fill_in_rest:
9680         /*-
9681          * Here we go through and fill out the part that deals with
9682          * stream/seq of the ones we skip.
9683          */
9684         SCTP_BUF_LEN(chk->data) = 0;
9685         {
9686                 struct sctp_tmit_chunk *at, *tp1, *last;
9687                 struct sctp_strseq *strseq;
9688                 unsigned int cnt_of_space, i, ovh;
9689                 unsigned int space_needed;
9690                 unsigned int cnt_of_skipped = 0;
9691
9692                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9693                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9694                                 /* no more to look at */
9695                                 break;
9696                         }
9697                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9698                                 /* We don't report these */
9699                                 continue;
9700                         }
9701                         cnt_of_skipped++;
9702                 }
9703                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9704                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9705
9706                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9707
9708                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9709                         ovh = SCTP_MIN_OVERHEAD;
9710                 } else {
9711                         ovh = SCTP_MIN_V4_OVERHEAD;
9712                 }
9713                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9714                         /* trim to a mtu size */
9715                         cnt_of_space = asoc->smallest_mtu - ovh;
9716                 }
9717                 if (cnt_of_space < space_needed) {
9718                         /*-
9719                          * ok we must trim down the chunk by lowering the
9720                          * advance peer ack point.
9721                          */
9722                         cnt_of_skipped = (cnt_of_space -
9723                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9724                             sizeof(struct sctp_strseq)));
9725                         /*-
9726                          * Go through and find the TSN that will be the one
9727                          * we report.
9728                          */
9729                         at = TAILQ_FIRST(&asoc->sent_queue);
9730                         for (i = 0; i < cnt_of_skipped; i++) {
9731                                 tp1 = TAILQ_NEXT(at, sctp_next);
9732                                 at = tp1;
9733                         }
9734                         last = at;
9735                         /*-
9736                          * last now points to last one I can report, update
9737                          * peer ack point
9738                          */
9739                         asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
9740                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9741                 }
9742                 chk->send_size = space_needed;
9743                 /* Setup the chunk */
9744                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9745                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9746                 fwdtsn->ch.chunk_flags = 0;
9747                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9748                 fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
9749                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9750                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9751                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9752                 fwdtsn++;
9753                 /*-
9754                  * Move pointer to after the fwdtsn and transfer to the
9755                  * strseq pointer.
9756                  */
9757                 strseq = (struct sctp_strseq *)fwdtsn;
9758                 /*-
9759                  * Now populate the strseq list. This is done blindly
9760                  * without pulling out duplicate stream info. This is
9761                  * inefficent but won't harm the process since the peer will
9762                  * look at these in sequence and will thus release anything.
9763                  * It could mean we exceed the PMTU and chop off some that
9764                  * we could have included.. but this is unlikely (aka 1432/4
9765                  * would mean 300+ stream seq's would have to be reported in
9766                  * one FWD-TSN. With a bit of work we can later FIX this to
9767                  * optimize and pull out duplcates.. but it does add more
9768                  * overhead. So for now... not!
9769                  */
9770                 at = TAILQ_FIRST(&asoc->sent_queue);
9771                 for (i = 0; i < cnt_of_skipped; i++) {
9772                         tp1 = TAILQ_NEXT(at, sctp_next);
9773                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9774                                 /* We don't report these */
9775                                 i--;
9776                                 at = tp1;
9777                                 continue;
9778                         }
9779                         strseq->stream = ntohs(at->rec.data.stream_number);
9780                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9781                         strseq++;
9782                         at = tp1;
9783                 }
9784         }
9785         return;
9786
9787 }
9788
9789 void
9790 sctp_send_sack(struct sctp_tcb *stcb)
9791 {
9792         /*-
9793          * Queue up a SACK in the control queue. We must first check to see
9794          * if a SACK is somehow on the control queue. If so, we will take
9795          * and and remove the old one.
9796          */
9797         struct sctp_association *asoc;
9798         struct sctp_tmit_chunk *chk, *a_chk;
9799         struct sctp_sack_chunk *sack;
9800         struct sctp_gap_ack_block *gap_descriptor;
9801         struct sack_track *selector;
9802         int mergeable = 0;
9803         int offset;
9804         caddr_t limit;
9805         uint32_t *dup;
9806         int limit_reached = 0;
9807         unsigned int i, jstart, siz, j;
9808         unsigned int num_gap_blocks = 0, space;
9809         int num_dups = 0;
9810         int space_req;
9811
9812         a_chk = NULL;
9813         asoc = &stcb->asoc;
9814         SCTP_TCB_LOCK_ASSERT(stcb);
9815         if (asoc->last_data_chunk_from == NULL) {
9816                 /* Hmm we never received anything */
9817                 return;
9818         }
9819         sctp_set_rwnd(stcb, asoc);
9820         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9821                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9822                         /* Hmm, found a sack already on queue, remove it */
9823                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9824                         asoc->ctrl_queue_cnt++;
9825                         a_chk = chk;
9826                         if (a_chk->data) {
9827                                 sctp_m_freem(a_chk->data);
9828                                 a_chk->data = NULL;
9829                         }
9830                         sctp_free_remote_addr(a_chk->whoTo);
9831                         a_chk->whoTo = NULL;
9832                         break;
9833                 }
9834         }
9835         if (a_chk == NULL) {
9836                 sctp_alloc_a_chunk(stcb, a_chk);
9837                 if (a_chk == NULL) {
9838                         /* No memory so we drop the idea, and set a timer */
9839                         if (stcb->asoc.delayed_ack) {
9840                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9841                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9842                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9843                                     stcb->sctp_ep, stcb, NULL);
9844                         } else {
9845                                 stcb->asoc.send_sack = 1;
9846                         }
9847                         return;
9848                 }
9849                 a_chk->copy_by_ref = 0;
9850                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9851                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9852                 a_chk->rec.chunk_id.can_take_data = 1;
9853         }
9854         /* Clear our pkt counts */
9855         asoc->data_pkts_seen = 0;
9856
9857         a_chk->asoc = asoc;
9858         a_chk->snd_count = 0;
9859         a_chk->send_size = 0;   /* fill in later */
9860         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9861         a_chk->whoTo = NULL;
9862
9863         if ((asoc->numduptsns) ||
9864             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9865             ) {
9866                 /*-
9867                  * Ok, we have some duplicates or the destination for the
9868                  * sack is unreachable, lets see if we can select an
9869                  * alternate than asoc->last_data_chunk_from
9870                  */
9871                 if ((!(asoc->last_data_chunk_from->dest_state &
9872                     SCTP_ADDR_NOT_REACHABLE)) &&
9873                     (asoc->used_alt_onsack > asoc->numnets)) {
9874                         /* We used an alt last time, don't this time */
9875                         a_chk->whoTo = NULL;
9876                 } else {
9877                         asoc->used_alt_onsack++;
9878                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9879                 }
9880                 if (a_chk->whoTo == NULL) {
9881                         /* Nope, no alternate */
9882                         a_chk->whoTo = asoc->last_data_chunk_from;
9883                         asoc->used_alt_onsack = 0;
9884                 }
9885         } else {
9886                 /*
9887                  * No duplicates so we use the last place we received data
9888                  * from.
9889                  */
9890                 asoc->used_alt_onsack = 0;
9891                 a_chk->whoTo = asoc->last_data_chunk_from;
9892         }
9893         if (a_chk->whoTo) {
9894                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9895         }
9896         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
9897                 /* no gaps */
9898                 space_req = sizeof(struct sctp_sack_chunk);
9899         } else {
9900                 /* gaps get a cluster */
9901                 space_req = MCLBYTES;
9902         }
9903         /* Ok now lets formulate a MBUF with our sack */
9904         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9905         if ((a_chk->data == NULL) ||
9906             (a_chk->whoTo == NULL)) {
9907                 /* rats, no mbuf memory */
9908                 if (a_chk->data) {
9909                         /* was a problem with the destination */
9910                         sctp_m_freem(a_chk->data);
9911                         a_chk->data = NULL;
9912                 }
9913                 sctp_free_a_chunk(stcb, a_chk);
9914                 /* sa_ignore NO_NULL_CHK */
9915                 if (stcb->asoc.delayed_ack) {
9916                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9917                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
9918                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9919                             stcb->sctp_ep, stcb, NULL);
9920                 } else {
9921                         stcb->asoc.send_sack = 1;
9922                 }
9923                 return;
9924         }
9925         /* ok, lets go through and fill it in */
9926         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
9927         space = M_TRAILINGSPACE(a_chk->data);
9928         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
9929                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
9930         }
9931         limit = mtod(a_chk->data, caddr_t);
9932         limit += space;
9933
9934         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
9935         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
9936         /* 0x01 is used by nonce for ecn */
9937         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
9938             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
9939             (asoc->peer_supports_ecn_nonce))
9940                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
9941         else
9942                 sack->ch.chunk_flags = 0;
9943
9944         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
9945                 /*-
9946                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
9947                  * received, then set high bit to 1, else 0. Reset
9948                  * pkts_rcvd.
9949                  */
9950                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
9951                 asoc->cmt_dac_pkts_rcvd = 0;
9952         }
9953 #ifdef SCTP_ASOCLOG_OF_TSNS
9954         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
9955         stcb->asoc.cumack_log_atsnt++;
9956         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
9957                 stcb->asoc.cumack_log_atsnt = 0;
9958         }
9959 #endif
9960         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
9961         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
9962         asoc->my_last_reported_rwnd = asoc->my_rwnd;
9963
9964         /* reset the readers interpretation */
9965         stcb->freed_by_sorcv_sincelast = 0;
9966
9967         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
9968
9969         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
9970         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
9971                 offset = 1;
9972                 /*-
9973                  * cum-ack behind the mapping array, so we start and use all
9974                  * entries.
9975                  */
9976                 jstart = 0;
9977         } else {
9978                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
9979                 /*-
9980                  * we skip the first one when the cum-ack is at or above the
9981                  * mapping array base. Note this only works if
9982                  */
9983                 jstart = 1;
9984         }
9985         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
9986                 /* we have a gap .. maybe */
9987                 for (i = 0; i < siz; i++) {
9988                         selector = &sack_array[asoc->mapping_array[i]];
9989                         if (mergeable && selector->right_edge) {
9990                                 /*
9991                                  * Backup, left and right edges were ok to
9992                                  * merge.
9993                                  */
9994                                 num_gap_blocks--;
9995                                 gap_descriptor--;
9996                         }
9997                         if (selector->num_entries == 0)
9998                                 mergeable = 0;
9999                         else {
10000                                 for (j = jstart; j < selector->num_entries; j++) {
10001                                         if (mergeable && selector->right_edge) {
10002                                                 /*
10003                                                  * do a merge by NOT setting
10004                                                  * the left side
10005                                                  */
10006                                                 mergeable = 0;
10007                                         } else {
10008                                                 /*
10009                                                  * no merge, set the left
10010                                                  * side
10011                                                  */
10012                                                 mergeable = 0;
10013                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10014                                         }
10015                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10016                                         num_gap_blocks++;
10017                                         gap_descriptor++;
10018                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10019                                                 /* no more room */
10020                                                 limit_reached = 1;
10021                                                 break;
10022                                         }
10023                                 }
10024                                 if (selector->left_edge) {
10025                                         mergeable = 1;
10026                                 }
10027                         }
10028                         if (limit_reached) {
10029                                 /* Reached the limit stop */
10030                                 break;
10031                         }
10032                         jstart = 0;
10033                         offset += 8;
10034                 }
10035                 if (num_gap_blocks == 0) {
10036                         /*
10037                          * slide not yet happened, and somehow we got called
10038                          * to send a sack. Cumack needs to move up.
10039                          */
10040                         int abort_flag = 0;
10041
10042                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10043                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10044                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10045                 }
10046         }
10047         /* now we must add any dups we are going to report. */
10048         if ((limit_reached == 0) && (asoc->numduptsns)) {
10049                 dup = (uint32_t *) gap_descriptor;
10050                 for (i = 0; i < asoc->numduptsns; i++) {
10051                         *dup = htonl(asoc->dup_tsns[i]);
10052                         dup++;
10053                         num_dups++;
10054                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10055                                 /* no more room */
10056                                 break;
10057                         }
10058                 }
10059                 asoc->numduptsns = 0;
10060         }
10061         /*
10062          * now that the chunk is prepared queue it to the control chunk
10063          * queue.
10064          */
10065         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
10066             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10067             (num_dups * sizeof(int32_t)));
10068         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10069         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10070         sack->sack.num_dup_tsns = htons(num_dups);
10071         sack->ch.chunk_length = htons(a_chk->send_size);
10072         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10073         asoc->ctrl_queue_cnt++;
10074         asoc->send_sack = 0;
10075         SCTP_STAT_INCR(sctps_sendsacks);
10076         return;
10077 }
10078
10079
10080 void
10081 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10082 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10083     SCTP_UNUSED
10084 #endif
10085 )
10086 {
10087         struct mbuf *m_abort;
10088         struct mbuf *m_out = NULL, *m_end = NULL;
10089         struct sctp_abort_chunk *abort = NULL;
10090         int sz;
10091         uint32_t auth_offset = 0;
10092         struct sctp_auth_chunk *auth = NULL;
10093         struct sctphdr *shdr;
10094
10095         /*-
10096          * Add an AUTH chunk, if chunk requires it and save the offset into
10097          * the chain for AUTH
10098          */
10099         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10100             stcb->asoc.peer_auth_chunks)) {
10101                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10102                     stcb, SCTP_ABORT_ASSOCIATION);
10103         }
10104         SCTP_TCB_LOCK_ASSERT(stcb);
10105         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10106         if (m_abort == NULL) {
10107                 /* no mbuf's */
10108                 if (m_out)
10109                         sctp_m_freem(m_out);
10110                 return;
10111         }
10112         /* link in any error */
10113         SCTP_BUF_NEXT(m_abort) = operr;
10114         sz = 0;
10115         if (operr) {
10116                 struct mbuf *n;
10117
10118                 n = operr;
10119                 while (n) {
10120                         sz += SCTP_BUF_LEN(n);
10121                         n = SCTP_BUF_NEXT(n);
10122                 }
10123         }
10124         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10125         if (m_out == NULL) {
10126                 /* NO Auth chunk prepended, so reserve space in front */
10127                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10128                 m_out = m_abort;
10129         } else {
10130                 /* Put AUTH chunk at the front of the chain */
10131                 SCTP_BUF_NEXT(m_end) = m_abort;
10132         }
10133
10134         /* fill in the ABORT chunk */
10135         abort = mtod(m_abort, struct sctp_abort_chunk *);
10136         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10137         abort->ch.chunk_flags = 0;
10138         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10139
10140         /* prepend and fill in the SCTP header */
10141         SCTP_BUF_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
10142         if (m_out == NULL) {
10143                 /* TSNH: no memory */
10144                 return;
10145         }
10146         shdr = mtod(m_out, struct sctphdr *);
10147         shdr->src_port = stcb->sctp_ep->sctp_lport;
10148         shdr->dest_port = stcb->rport;
10149         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
10150         shdr->checksum = 0;
10151         auth_offset += sizeof(struct sctphdr);
10152
10153         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10154             stcb->asoc.primary_destination,
10155             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10156             m_out, auth_offset, auth, 1, 0, NULL, 0, stcb->asoc.primary_destination->port, so_locked, NULL);
10157         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10158 }
10159
10160 void
10161 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10162     struct sctp_nets *net)
10163 {
10164         /* formulate and SEND a SHUTDOWN-COMPLETE */
10165         struct mbuf *m_shutdown_comp;
10166         struct sctp_shutdown_complete_msg *comp_cp;
10167
10168         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 0, M_DONTWAIT, 1, MT_HEADER);
10169         if (m_shutdown_comp == NULL) {
10170                 /* no mbuf's */
10171                 return;
10172         }
10173         comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
10174         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10175         comp_cp->shut_cmp.ch.chunk_flags = 0;
10176         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10177         comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
10178         comp_cp->sh.dest_port = stcb->rport;
10179         comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
10180         comp_cp->sh.checksum = 0;
10181
10182         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
10183         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10184             (struct sockaddr *)&net->ro._l_addr,
10185             m_shutdown_comp, 0, NULL, 1, 0, NULL, 0, net->port, SCTP_SO_NOT_LOCKED, NULL);
10186         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10187         return;
10188 }
10189
10190 void
10191 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10192     uint32_t vrf_id, uint16_t port)
10193 {
10194         /* formulate and SEND a SHUTDOWN-COMPLETE */
10195         struct mbuf *o_pak;
10196         struct mbuf *mout;
10197         struct ip *iph, *iph_out;
10198         struct udphdr *udp = NULL;
10199
10200 #ifdef INET6
10201         struct ip6_hdr *ip6, *ip6_out;
10202
10203 #endif
10204         int offset_out, len, mlen;
10205         struct sctp_shutdown_complete_msg *comp_cp;
10206
10207         iph = mtod(m, struct ip *);
10208         switch (iph->ip_v) {
10209         case IPVERSION:
10210                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10211                 break;
10212 #ifdef INET6
10213         case IPV6_VERSION >> 4:
10214                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10215                 break;
10216 #endif
10217         default:
10218                 return;
10219         }
10220         if (port) {
10221                 len += sizeof(struct udphdr);
10222         }
10223         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
10224         if (mout == NULL) {
10225                 return;
10226         }
10227         SCTP_BUF_LEN(mout) = len;
10228         SCTP_BUF_NEXT(mout) = NULL;
10229         iph_out = NULL;
10230 #ifdef INET6
10231         ip6_out = NULL;
10232 #endif
10233         offset_out = 0;
10234
10235         switch (iph->ip_v) {
10236         case IPVERSION:
10237                 iph_out = mtod(mout, struct ip *);
10238
10239                 /* Fill in the IP header for the ABORT */
10240                 iph_out->ip_v = IPVERSION;
10241                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10242                 iph_out->ip_tos = (u_char)0;
10243                 iph_out->ip_id = 0;
10244                 iph_out->ip_off = 0;
10245                 iph_out->ip_ttl = MAXTTL;
10246                 if (port) {
10247                         iph_out->ip_p = IPPROTO_UDP;
10248                 } else {
10249                         iph_out->ip_p = IPPROTO_SCTP;
10250                 }
10251                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10252                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10253
10254                 /* let IP layer calculate this */
10255                 iph_out->ip_sum = 0;
10256                 offset_out += sizeof(*iph_out);
10257                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10258                     (caddr_t)iph_out + offset_out);
10259                 break;
10260 #ifdef INET6
10261         case IPV6_VERSION >> 4:
10262                 ip6 = (struct ip6_hdr *)iph;
10263                 ip6_out = mtod(mout, struct ip6_hdr *);
10264
10265                 /* Fill in the IPv6 header for the ABORT */
10266                 ip6_out->ip6_flow = ip6->ip6_flow;
10267                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
10268                 if (port) {
10269                         ip6_out->ip6_nxt = IPPROTO_UDP;
10270                 } else {
10271                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10272                 }
10273                 ip6_out->ip6_src = ip6->ip6_dst;
10274                 ip6_out->ip6_dst = ip6->ip6_src;
10275                 /*
10276                  * ?? The old code had both the iph len + payload, I think
10277                  * this is wrong and would never have worked
10278                  */
10279                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10280                 offset_out += sizeof(*ip6_out);
10281                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10282                     (caddr_t)ip6_out + offset_out);
10283                 break;
10284 #endif                          /* INET6 */
10285         default:
10286                 /* Currently not supported. */
10287                 return;
10288         }
10289         if (port) {
10290                 udp = (struct udphdr *)comp_cp;
10291                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10292                 udp->uh_dport = port;
10293                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10294                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10295                 offset_out += sizeof(struct udphdr);
10296                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10297         }
10298         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10299                 /* no mbuf's */
10300                 sctp_m_freem(mout);
10301                 return;
10302         }
10303         /* Now copy in and fill in the ABORT tags etc. */
10304         comp_cp->sh.src_port = sh->dest_port;
10305         comp_cp->sh.dest_port = sh->src_port;
10306         comp_cp->sh.checksum = 0;
10307         comp_cp->sh.v_tag = sh->v_tag;
10308         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10309         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10310         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10311
10312         /* add checksum */
10313         comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
10314         if (iph_out != NULL) {
10315                 sctp_route_t ro;
10316                 int ret;
10317                 struct sctp_tcb *stcb = NULL;
10318
10319                 mlen = SCTP_BUF_LEN(mout);
10320                 bzero(&ro, sizeof ro);
10321                 /* set IPv4 length */
10322                 iph_out->ip_len = mlen;
10323 #ifdef  SCTP_PACKET_LOGGING
10324                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10325                         sctp_packet_log(mout, mlen);
10326 #endif
10327                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10328                 if (port) {
10329                         SCTP_ENABLE_UDP_CSUM(o_pak);
10330                 }
10331                 /* out it goes */
10332                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10333
10334                 /* Free the route if we got one back */
10335                 if (ro.ro_rt)
10336                         RTFREE(ro.ro_rt);
10337         }
10338 #ifdef INET6
10339         if (ip6_out != NULL) {
10340                 struct route_in6 ro;
10341                 int ret;
10342                 struct sctp_tcb *stcb = NULL;
10343                 struct ifnet *ifp = NULL;
10344
10345                 bzero(&ro, sizeof(ro));
10346                 mlen = SCTP_BUF_LEN(mout);
10347 #ifdef  SCTP_PACKET_LOGGING
10348                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10349                         sctp_packet_log(mout, mlen);
10350 #endif
10351                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10352                 if (port) {
10353                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr),
10354                             sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr))) == 0) {
10355                                 udp->uh_sum = 0xffff;
10356                         }
10357                 }
10358                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10359
10360                 /* Free the route if we got one back */
10361                 if (ro.ro_rt)
10362                         RTFREE(ro.ro_rt);
10363         }
10364 #endif
10365         SCTP_STAT_INCR(sctps_sendpackets);
10366         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10367         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10368         return;
10369
10370 }
10371
10372 static struct sctp_nets *
10373 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10374 {
10375         struct sctp_nets *net, *hnet;
10376         int ms_goneby, highest_ms, state_overide = 0;
10377
10378         (void)SCTP_GETTIME_TIMEVAL(now);
10379         highest_ms = 0;
10380         hnet = NULL;
10381         SCTP_TCB_LOCK_ASSERT(stcb);
10382         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10383                 if (
10384                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10385                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10386                     ) {
10387                         /*
10388                          * Skip this guy from consideration if HB is off AND
10389                          * its confirmed
10390                          */
10391                         continue;
10392                 }
10393                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10394                         /* skip this dest net from consideration */
10395                         continue;
10396                 }
10397                 if (net->last_sent_time.tv_sec) {
10398                         /* Sent to so we subtract */
10399                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10400                 } else
10401                         /* Never been sent to */
10402                         ms_goneby = 0x7fffffff;
10403                 /*-
10404                  * When the address state is unconfirmed but still
10405                  * considered reachable, we HB at a higher rate. Once it
10406                  * goes confirmed OR reaches the "unreachable" state, thenw
10407                  * we cut it back to HB at a more normal pace.
10408                  */
10409                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10410                         state_overide = 1;
10411                 } else {
10412                         state_overide = 0;
10413                 }
10414
10415                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10416                     (ms_goneby > highest_ms)) {
10417                         highest_ms = ms_goneby;
10418                         hnet = net;
10419                 }
10420         }
10421         if (hnet &&
10422             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10423                 state_overide = 1;
10424         } else {
10425                 state_overide = 0;
10426         }
10427
10428         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10429                 /*-
10430                  * Found the one with longest delay bounds OR it is
10431                  * unconfirmed and still not marked unreachable.
10432                  */
10433                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10434 #ifdef SCTP_DEBUG
10435                 if (hnet) {
10436                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10437                             (struct sockaddr *)&hnet->ro._l_addr);
10438                 } else {
10439                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10440                 }
10441 #endif
10442                 /* update the timer now */
10443                 hnet->last_sent_time = *now;
10444                 return (hnet);
10445         }
10446         /* Nothing to HB */
10447         return (NULL);
10448 }
10449
10450 int
10451 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10452 {
10453         struct sctp_tmit_chunk *chk;
10454         struct sctp_nets *net;
10455         struct sctp_heartbeat_chunk *hb;
10456         struct timeval now;
10457         struct sockaddr_in *sin;
10458         struct sockaddr_in6 *sin6;
10459
10460         SCTP_TCB_LOCK_ASSERT(stcb);
10461         if (user_req == 0) {
10462                 net = sctp_select_hb_destination(stcb, &now);
10463                 if (net == NULL) {
10464                         /*-
10465                          * All our busy none to send to, just start the
10466                          * timer again.
10467                          */
10468                         if (stcb->asoc.state == 0) {
10469                                 return (0);
10470                         }
10471                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10472                             stcb->sctp_ep,
10473                             stcb,
10474                             net);
10475                         return (0);
10476                 }
10477         } else {
10478                 net = u_net;
10479                 if (net == NULL) {
10480                         return (0);
10481                 }
10482                 (void)SCTP_GETTIME_TIMEVAL(&now);
10483         }
10484         sin = (struct sockaddr_in *)&net->ro._l_addr;
10485         if (sin->sin_family != AF_INET) {
10486                 if (sin->sin_family != AF_INET6) {
10487                         /* huh */
10488                         return (0);
10489                 }
10490         }
10491         sctp_alloc_a_chunk(stcb, chk);
10492         if (chk == NULL) {
10493                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10494                 return (0);
10495         }
10496         chk->copy_by_ref = 0;
10497         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10498         chk->rec.chunk_id.can_take_data = 1;
10499         chk->asoc = &stcb->asoc;
10500         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10501
10502         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10503         if (chk->data == NULL) {
10504                 sctp_free_a_chunk(stcb, chk);
10505                 return (0);
10506         }
10507         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10508         SCTP_BUF_LEN(chk->data) = chk->send_size;
10509         chk->sent = SCTP_DATAGRAM_UNSENT;
10510         chk->snd_count = 0;
10511         chk->whoTo = net;
10512         atomic_add_int(&chk->whoTo->ref_count, 1);
10513         /* Now we have a mbuf that we can fill in with the details */
10514         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10515         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10516         /* fill out chunk header */
10517         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10518         hb->ch.chunk_flags = 0;
10519         hb->ch.chunk_length = htons(chk->send_size);
10520         /* Fill out hb parameter */
10521         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10522         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10523         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10524         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10525         /* Did our user request this one, put it in */
10526         hb->heartbeat.hb_info.user_req = user_req;
10527         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10528         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10529         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10530                 /*
10531                  * we only take from the entropy pool if the address is not
10532                  * confirmed.
10533                  */
10534                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10535                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10536         } else {
10537                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10538                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10539         }
10540         if (sin->sin_family == AF_INET) {
10541                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10542         } else if (sin->sin_family == AF_INET6) {
10543                 /* We leave the scope the way it is in our lookup table. */
10544                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10545                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10546         } else {
10547                 /* huh compiler bug */
10548                 return (0);
10549         }
10550
10551         /*
10552          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10553          * PF-heartbeats.  Because of this, threshold management is done by
10554          * the t3 timer handler, and does not need to be done upon the send
10555          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10556          * heartbeat is being sent is in PF state, do NOT do threshold
10557          * management.
10558          */
10559         if ((SCTP_BASE_SYSCTL(sctp_cmt_pf) == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10560                 /* ok we have a destination that needs a beat */
10561                 /* lets do the theshold management Qiaobing style */
10562                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10563                     stcb->asoc.max_send_times)) {
10564                         /*-
10565                          * we have lost the association, in a way this is
10566                          * quite bad since we really are one less time since
10567                          * we really did not send yet. This is the down side
10568                          * to the Q's style as defined in the RFC and not my
10569                          * alternate style defined in the RFC.
10570                          */
10571                         if (chk->data != NULL) {
10572                                 sctp_m_freem(chk->data);
10573                                 chk->data = NULL;
10574                         }
10575                         /*
10576                          * Here we do NOT use the macro since the
10577                          * association is now gone.
10578                          */
10579                         if (chk->whoTo) {
10580                                 sctp_free_remote_addr(chk->whoTo);
10581                                 chk->whoTo = NULL;
10582                         }
10583                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10584                         return (-1);
10585                 }
10586         }
10587         net->hb_responded = 0;
10588         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10589         stcb->asoc.ctrl_queue_cnt++;
10590         SCTP_STAT_INCR(sctps_sendheartbeat);
10591         /*-
10592          * Call directly med level routine to put out the chunk. It will
10593          * always tumble out control chunks aka HB but it may even tumble
10594          * out data too.
10595          */
10596         return (1);
10597 }
10598
10599 void
10600 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10601     uint32_t high_tsn)
10602 {
10603         struct sctp_association *asoc;
10604         struct sctp_ecne_chunk *ecne;
10605         struct sctp_tmit_chunk *chk;
10606
10607         asoc = &stcb->asoc;
10608         SCTP_TCB_LOCK_ASSERT(stcb);
10609         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10610                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
10611                         /* found a previous ECN_ECHO update it if needed */
10612                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10613                         ecne->tsn = htonl(high_tsn);
10614                         return;
10615                 }
10616         }
10617         /* nope could not find one to update so we must build one */
10618         sctp_alloc_a_chunk(stcb, chk);
10619         if (chk == NULL) {
10620                 return;
10621         }
10622         chk->copy_by_ref = 0;
10623         SCTP_STAT_INCR(sctps_sendecne);
10624         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10625         chk->rec.chunk_id.can_take_data = 0;
10626         chk->asoc = &stcb->asoc;
10627         chk->send_size = sizeof(struct sctp_ecne_chunk);
10628         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10629         if (chk->data == NULL) {
10630                 sctp_free_a_chunk(stcb, chk);
10631                 return;
10632         }
10633         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10634         SCTP_BUF_LEN(chk->data) = chk->send_size;
10635         chk->sent = SCTP_DATAGRAM_UNSENT;
10636         chk->snd_count = 0;
10637         chk->whoTo = net;
10638         atomic_add_int(&chk->whoTo->ref_count, 1);
10639         stcb->asoc.ecn_echo_cnt_onq++;
10640         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10641         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10642         ecne->ch.chunk_flags = 0;
10643         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10644         ecne->tsn = htonl(high_tsn);
10645         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10646         asoc->ctrl_queue_cnt++;
10647 }
10648
10649 void
10650 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10651     struct mbuf *m, int iphlen, int bad_crc)
10652 {
10653         struct sctp_association *asoc;
10654         struct sctp_pktdrop_chunk *drp;
10655         struct sctp_tmit_chunk *chk;
10656         uint8_t *datap;
10657         int len;
10658         int was_trunc = 0;
10659         struct ip *iph;
10660
10661 #ifdef INET6
10662         struct ip6_hdr *ip6h;
10663
10664 #endif
10665         int fullsz = 0, extra = 0;
10666         long spc;
10667         int offset;
10668         struct sctp_chunkhdr *ch, chunk_buf;
10669         unsigned int chk_length;
10670
10671         if (!stcb) {
10672                 return;
10673         }
10674         asoc = &stcb->asoc;
10675         SCTP_TCB_LOCK_ASSERT(stcb);
10676         if (asoc->peer_supports_pktdrop == 0) {
10677                 /*-
10678                  * peer must declare support before I send one.
10679                  */
10680                 return;
10681         }
10682         if (stcb->sctp_socket == NULL) {
10683                 return;
10684         }
10685         sctp_alloc_a_chunk(stcb, chk);
10686         if (chk == NULL) {
10687                 return;
10688         }
10689         chk->copy_by_ref = 0;
10690         iph = mtod(m, struct ip *);
10691         if (iph == NULL) {
10692                 sctp_free_a_chunk(stcb, chk);
10693                 return;
10694         }
10695         switch (iph->ip_v) {
10696         case IPVERSION:
10697                 /* IPv4 */
10698                 len = chk->send_size = iph->ip_len;
10699                 break;
10700 #ifdef INET6
10701         case IPV6_VERSION >> 4:
10702                 /* IPv6 */
10703                 ip6h = mtod(m, struct ip6_hdr *);
10704                 len = chk->send_size = htons(ip6h->ip6_plen);
10705                 break;
10706 #endif
10707         default:
10708                 return;
10709         }
10710         /* Validate that we do not have an ABORT in here. */
10711         offset = iphlen + sizeof(struct sctphdr);
10712         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10713             sizeof(*ch), (uint8_t *) & chunk_buf);
10714         while (ch != NULL) {
10715                 chk_length = ntohs(ch->chunk_length);
10716                 if (chk_length < sizeof(*ch)) {
10717                         /* break to abort land */
10718                         break;
10719                 }
10720                 switch (ch->chunk_type) {
10721                 case SCTP_PACKET_DROPPED:
10722                 case SCTP_ABORT_ASSOCIATION:
10723                         /*-
10724                          * we don't respond with an PKT-DROP to an ABORT
10725                          * or PKT-DROP
10726                          */
10727                         sctp_free_a_chunk(stcb, chk);
10728                         return;
10729                 default:
10730                         break;
10731                 }
10732                 offset += SCTP_SIZE32(chk_length);
10733                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10734                     sizeof(*ch), (uint8_t *) & chunk_buf);
10735         }
10736
10737         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10738             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10739                 /*
10740                  * only send 1 mtu worth, trim off the excess on the end.
10741                  */
10742                 fullsz = len - extra;
10743                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10744                 was_trunc = 1;
10745         }
10746         chk->asoc = &stcb->asoc;
10747         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10748         if (chk->data == NULL) {
10749 jump_out:
10750                 sctp_free_a_chunk(stcb, chk);
10751                 return;
10752         }
10753         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10754         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10755         if (drp == NULL) {
10756                 sctp_m_freem(chk->data);
10757                 chk->data = NULL;
10758                 goto jump_out;
10759         }
10760         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10761             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10762         chk->book_size_scale = 0;
10763         if (was_trunc) {
10764                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
10765                 drp->trunc_len = htons(fullsz);
10766                 /*
10767                  * Len is already adjusted to size minus overhead above take
10768                  * out the pkt_drop chunk itself from it.
10769                  */
10770                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
10771                 len = chk->send_size;
10772         } else {
10773                 /* no truncation needed */
10774                 drp->ch.chunk_flags = 0;
10775                 drp->trunc_len = htons(0);
10776         }
10777         if (bad_crc) {
10778                 drp->ch.chunk_flags |= SCTP_BADCRC;
10779         }
10780         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
10781         SCTP_BUF_LEN(chk->data) = chk->send_size;
10782         chk->sent = SCTP_DATAGRAM_UNSENT;
10783         chk->snd_count = 0;
10784         if (net) {
10785                 /* we should hit here */
10786                 chk->whoTo = net;
10787         } else {
10788                 chk->whoTo = asoc->primary_destination;
10789         }
10790         atomic_add_int(&chk->whoTo->ref_count, 1);
10791         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
10792         chk->rec.chunk_id.can_take_data = 1;
10793         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
10794         drp->ch.chunk_length = htons(chk->send_size);
10795         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
10796         if (spc < 0) {
10797                 spc = 0;
10798         }
10799         drp->bottle_bw = htonl(spc);
10800         if (asoc->my_rwnd) {
10801                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
10802                     asoc->size_on_all_streams +
10803                     asoc->my_rwnd_control_len +
10804                     stcb->sctp_socket->so_rcv.sb_cc);
10805         } else {
10806                 /*-
10807                  * If my rwnd is 0, possibly from mbuf depletion as well as
10808                  * space used, tell the peer there is NO space aka onq == bw
10809                  */
10810                 drp->current_onq = htonl(spc);
10811         }
10812         drp->reserved = 0;
10813         datap = drp->data;
10814         m_copydata(m, iphlen, len, (caddr_t)datap);
10815         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10816         asoc->ctrl_queue_cnt++;
10817 }
10818
10819 void
10820 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
10821 {
10822         struct sctp_association *asoc;
10823         struct sctp_cwr_chunk *cwr;
10824         struct sctp_tmit_chunk *chk;
10825
10826         asoc = &stcb->asoc;
10827         SCTP_TCB_LOCK_ASSERT(stcb);
10828         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10829                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
10830                         /* found a previous ECN_CWR update it if needed */
10831                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10832                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
10833                             MAX_TSN)) {
10834                                 cwr->tsn = htonl(high_tsn);
10835                         }
10836                         return;
10837                 }
10838         }
10839         /* nope could not find one to update so we must build one */
10840         sctp_alloc_a_chunk(stcb, chk);
10841         if (chk == NULL) {
10842                 return;
10843         }
10844         chk->copy_by_ref = 0;
10845         chk->rec.chunk_id.id = SCTP_ECN_CWR;
10846         chk->rec.chunk_id.can_take_data = 1;
10847         chk->asoc = &stcb->asoc;
10848         chk->send_size = sizeof(struct sctp_cwr_chunk);
10849         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10850         if (chk->data == NULL) {
10851                 sctp_free_a_chunk(stcb, chk);
10852                 return;
10853         }
10854         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10855         SCTP_BUF_LEN(chk->data) = chk->send_size;
10856         chk->sent = SCTP_DATAGRAM_UNSENT;
10857         chk->snd_count = 0;
10858         chk->whoTo = net;
10859         atomic_add_int(&chk->whoTo->ref_count, 1);
10860         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10861         cwr->ch.chunk_type = SCTP_ECN_CWR;
10862         cwr->ch.chunk_flags = 0;
10863         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
10864         cwr->tsn = htonl(high_tsn);
10865         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10866         asoc->ctrl_queue_cnt++;
10867 }
10868
10869 void
10870 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
10871     int number_entries, uint16_t * list,
10872     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
10873 {
10874         int len, old_len, i;
10875         struct sctp_stream_reset_out_request *req_out;
10876         struct sctp_chunkhdr *ch;
10877
10878         ch = mtod(chk->data, struct sctp_chunkhdr *);
10879
10880
10881         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10882
10883         /* get to new offset for the param. */
10884         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
10885         /* now how long will this param be? */
10886         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
10887         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
10888         req_out->ph.param_length = htons(len);
10889         req_out->request_seq = htonl(seq);
10890         req_out->response_seq = htonl(resp_seq);
10891         req_out->send_reset_at_tsn = htonl(last_sent);
10892         if (number_entries) {
10893                 for (i = 0; i < number_entries; i++) {
10894                         req_out->list_of_streams[i] = htons(list[i]);
10895                 }
10896         }
10897         if (SCTP_SIZE32(len) > len) {
10898                 /*-
10899                  * Need to worry about the pad we may end up adding to the
10900                  * end. This is easy since the struct is either aligned to 4
10901                  * bytes or 2 bytes off.
10902                  */
10903                 req_out->list_of_streams[number_entries] = 0;
10904         }
10905         /* now fix the chunk length */
10906         ch->chunk_length = htons(len + old_len);
10907         chk->book_size = len + old_len;
10908         chk->book_size_scale = 0;
10909         chk->send_size = SCTP_SIZE32(chk->book_size);
10910         SCTP_BUF_LEN(chk->data) = chk->send_size;
10911         return;
10912 }
10913
10914
10915 void
10916 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
10917     int number_entries, uint16_t * list,
10918     uint32_t seq)
10919 {
10920         int len, old_len, i;
10921         struct sctp_stream_reset_in_request *req_in;
10922         struct sctp_chunkhdr *ch;
10923
10924         ch = mtod(chk->data, struct sctp_chunkhdr *);
10925
10926
10927         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10928
10929         /* get to new offset for the param. */
10930         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
10931         /* now how long will this param be? */
10932         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
10933         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
10934         req_in->ph.param_length = htons(len);
10935         req_in->request_seq = htonl(seq);
10936         if (number_entries) {
10937                 for (i = 0; i < number_entries; i++) {
10938                         req_in->list_of_streams[i] = htons(list[i]);
10939                 }
10940         }
10941         if (SCTP_SIZE32(len) > len) {
10942                 /*-
10943                  * Need to worry about the pad we may end up adding to the
10944                  * end. This is easy since the struct is either aligned to 4
10945                  * bytes or 2 bytes off.
10946                  */
10947                 req_in->list_of_streams[number_entries] = 0;
10948         }
10949         /* now fix the chunk length */
10950         ch->chunk_length = htons(len + old_len);
10951         chk->book_size = len + old_len;
10952         chk->book_size_scale = 0;
10953         chk->send_size = SCTP_SIZE32(chk->book_size);
10954         SCTP_BUF_LEN(chk->data) = chk->send_size;
10955         return;
10956 }
10957
10958
10959 void
10960 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
10961     uint32_t seq)
10962 {
10963         int len, old_len;
10964         struct sctp_stream_reset_tsn_request *req_tsn;
10965         struct sctp_chunkhdr *ch;
10966
10967         ch = mtod(chk->data, struct sctp_chunkhdr *);
10968
10969
10970         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10971
10972         /* get to new offset for the param. */
10973         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
10974         /* now how long will this param be? */
10975         len = sizeof(struct sctp_stream_reset_tsn_request);
10976         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
10977         req_tsn->ph.param_length = htons(len);
10978         req_tsn->request_seq = htonl(seq);
10979
10980         /* now fix the chunk length */
10981         ch->chunk_length = htons(len + old_len);
10982         chk->send_size = len + old_len;
10983         chk->book_size = SCTP_SIZE32(chk->send_size);
10984         chk->book_size_scale = 0;
10985         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
10986         return;
10987 }
10988
10989 void
10990 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
10991     uint32_t resp_seq, uint32_t result)
10992 {
10993         int len, old_len;
10994         struct sctp_stream_reset_response *resp;
10995         struct sctp_chunkhdr *ch;
10996
10997         ch = mtod(chk->data, struct sctp_chunkhdr *);
10998
10999
11000         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11001
11002         /* get to new offset for the param. */
11003         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11004         /* now how long will this param be? */
11005         len = sizeof(struct sctp_stream_reset_response);
11006         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11007         resp->ph.param_length = htons(len);
11008         resp->response_seq = htonl(resp_seq);
11009         resp->result = ntohl(result);
11010
11011         /* now fix the chunk length */
11012         ch->chunk_length = htons(len + old_len);
11013         chk->book_size = len + old_len;
11014         chk->book_size_scale = 0;
11015         chk->send_size = SCTP_SIZE32(chk->book_size);
11016         SCTP_BUF_LEN(chk->data) = chk->send_size;
11017         return;
11018
11019 }
11020
11021
11022 void
11023 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11024     uint32_t resp_seq, uint32_t result,
11025     uint32_t send_una, uint32_t recv_next)
11026 {
11027         int len, old_len;
11028         struct sctp_stream_reset_response_tsn *resp;
11029         struct sctp_chunkhdr *ch;
11030
11031         ch = mtod(chk->data, struct sctp_chunkhdr *);
11032
11033
11034         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11035
11036         /* get to new offset for the param. */
11037         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11038         /* now how long will this param be? */
11039         len = sizeof(struct sctp_stream_reset_response_tsn);
11040         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11041         resp->ph.param_length = htons(len);
11042         resp->response_seq = htonl(resp_seq);
11043         resp->result = htonl(result);
11044         resp->senders_next_tsn = htonl(send_una);
11045         resp->receivers_next_tsn = htonl(recv_next);
11046
11047         /* now fix the chunk length */
11048         ch->chunk_length = htons(len + old_len);
11049         chk->book_size = len + old_len;
11050         chk->send_size = SCTP_SIZE32(chk->book_size);
11051         chk->book_size_scale = 0;
11052         SCTP_BUF_LEN(chk->data) = chk->send_size;
11053         return;
11054 }
11055
11056
11057 int
11058 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11059     int number_entries, uint16_t * list,
11060     uint8_t send_out_req, uint32_t resp_seq,
11061     uint8_t send_in_req,
11062     uint8_t send_tsn_req)
11063 {
11064
11065         struct sctp_association *asoc;
11066         struct sctp_tmit_chunk *chk;
11067         struct sctp_chunkhdr *ch;
11068         uint32_t seq;
11069
11070         asoc = &stcb->asoc;
11071         if (asoc->stream_reset_outstanding) {
11072                 /*-
11073                  * Already one pending, must get ACK back to clear the flag.
11074                  */
11075                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11076                 return (EBUSY);
11077         }
11078         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
11079                 /* nothing to do */
11080                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11081                 return (EINVAL);
11082         }
11083         if (send_tsn_req && (send_out_req || send_in_req)) {
11084                 /* error, can't do that */
11085                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11086                 return (EINVAL);
11087         }
11088         sctp_alloc_a_chunk(stcb, chk);
11089         if (chk == NULL) {
11090                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11091                 return (ENOMEM);
11092         }
11093         chk->copy_by_ref = 0;
11094         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11095         chk->rec.chunk_id.can_take_data = 0;
11096         chk->asoc = &stcb->asoc;
11097         chk->book_size = sizeof(struct sctp_chunkhdr);
11098         chk->send_size = SCTP_SIZE32(chk->book_size);
11099         chk->book_size_scale = 0;
11100
11101         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11102         if (chk->data == NULL) {
11103                 sctp_free_a_chunk(stcb, chk);
11104                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11105                 return (ENOMEM);
11106         }
11107         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11108
11109         /* setup chunk parameters */
11110         chk->sent = SCTP_DATAGRAM_UNSENT;
11111         chk->snd_count = 0;
11112         chk->whoTo = asoc->primary_destination;
11113         atomic_add_int(&chk->whoTo->ref_count, 1);
11114
11115         ch = mtod(chk->data, struct sctp_chunkhdr *);
11116         ch->chunk_type = SCTP_STREAM_RESET;
11117         ch->chunk_flags = 0;
11118         ch->chunk_length = htons(chk->book_size);
11119         SCTP_BUF_LEN(chk->data) = chk->send_size;
11120
11121         seq = stcb->asoc.str_reset_seq_out;
11122         if (send_out_req) {
11123                 sctp_add_stream_reset_out(chk, number_entries, list,
11124                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11125                 asoc->stream_reset_out_is_outstanding = 1;
11126                 seq++;
11127                 asoc->stream_reset_outstanding++;
11128         }
11129         if (send_in_req) {
11130                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11131                 asoc->stream_reset_outstanding++;
11132         }
11133         if (send_tsn_req) {
11134                 sctp_add_stream_reset_tsn(chk, seq);
11135                 asoc->stream_reset_outstanding++;
11136         }
11137         asoc->str_reset = chk;
11138
11139         /* insert the chunk for sending */
11140         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11141             chk,
11142             sctp_next);
11143         asoc->ctrl_queue_cnt++;
11144         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11145         return (0);
11146 }
11147
11148 void
11149 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11150     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11151 {
11152         /*-
11153          * Formulate the abort message, and send it back down.
11154          */
11155         struct mbuf *o_pak;
11156         struct mbuf *mout;
11157         struct sctp_abort_msg *abm;
11158         struct ip *iph, *iph_out;
11159         struct udphdr *udp;
11160
11161 #ifdef INET6
11162         struct ip6_hdr *ip6, *ip6_out;
11163
11164 #endif
11165         int iphlen_out, len;
11166
11167         /* don't respond to ABORT with ABORT */
11168         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11169                 if (err_cause)
11170                         sctp_m_freem(err_cause);
11171                 return;
11172         }
11173         iph = mtod(m, struct ip *);
11174         switch (iph->ip_v) {
11175         case IPVERSION:
11176                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11177                 break;
11178 #ifdef INET6
11179         case IPV6_VERSION >> 4:
11180                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11181                 break;
11182 #endif
11183         default:
11184                 return;
11185         }
11186         if (port) {
11187                 len += sizeof(struct udphdr);
11188         }
11189         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
11190         if (mout == NULL) {
11191                 if (err_cause)
11192                         sctp_m_freem(err_cause);
11193                 return;
11194         }
11195         SCTP_BUF_LEN(mout) = len;
11196         SCTP_BUF_NEXT(mout) = err_cause;
11197         iph_out = NULL;
11198 #ifdef INET6
11199         ip6_out = NULL;
11200 #endif
11201         switch (iph->ip_v) {
11202         case IPVERSION:
11203                 iph_out = mtod(mout, struct ip *);
11204
11205                 /* Fill in the IP header for the ABORT */
11206                 iph_out->ip_v = IPVERSION;
11207                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11208                 iph_out->ip_tos = (u_char)0;
11209                 iph_out->ip_id = 0;
11210                 iph_out->ip_off = 0;
11211                 iph_out->ip_ttl = MAXTTL;
11212                 if (port) {
11213                         iph_out->ip_p = IPPROTO_UDP;
11214                 } else {
11215                         iph_out->ip_p = IPPROTO_SCTP;
11216                 }
11217                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11218                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11219                 /* let IP layer calculate this */
11220                 iph_out->ip_sum = 0;
11221
11222                 iphlen_out = sizeof(*iph_out);
11223                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11224                 break;
11225 #ifdef INET6
11226         case IPV6_VERSION >> 4:
11227                 ip6 = (struct ip6_hdr *)iph;
11228                 ip6_out = mtod(mout, struct ip6_hdr *);
11229
11230                 /* Fill in the IP6 header for the ABORT */
11231                 ip6_out->ip6_flow = ip6->ip6_flow;
11232                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
11233                 if (port) {
11234                         ip6_out->ip6_nxt = IPPROTO_UDP;
11235                 } else {
11236                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11237                 }
11238                 ip6_out->ip6_src = ip6->ip6_dst;
11239                 ip6_out->ip6_dst = ip6->ip6_src;
11240
11241                 iphlen_out = sizeof(*ip6_out);
11242                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11243                 break;
11244 #endif                          /* INET6 */
11245         default:
11246                 /* Currently not supported */
11247                 if (err_cause)
11248                         sctp_m_freem(err_cause);
11249                 sctp_m_freem(mout);
11250                 return;
11251         }
11252
11253         udp = (struct udphdr *)abm;
11254         if (port) {
11255                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11256                 udp->uh_dport = port;
11257                 /* set udp->uh_ulen later */
11258                 udp->uh_sum = 0;
11259                 iphlen_out += sizeof(struct udphdr);
11260                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11261         }
11262         abm->sh.src_port = sh->dest_port;
11263         abm->sh.dest_port = sh->src_port;
11264         abm->sh.checksum = 0;
11265         if (vtag == 0) {
11266                 abm->sh.v_tag = sh->v_tag;
11267                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11268         } else {
11269                 abm->sh.v_tag = htonl(vtag);
11270                 abm->msg.ch.chunk_flags = 0;
11271         }
11272         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11273
11274         if (err_cause) {
11275                 struct mbuf *m_tmp = err_cause;
11276                 int err_len = 0;
11277
11278                 /* get length of the err_cause chain */
11279                 while (m_tmp != NULL) {
11280                         err_len += SCTP_BUF_LEN(m_tmp);
11281                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11282                 }
11283                 len = SCTP_BUF_LEN(mout) + err_len;
11284                 if (err_len % 4) {
11285                         /* need pad at end of chunk */
11286                         uint32_t cpthis = 0;
11287                         int padlen;
11288
11289                         padlen = 4 - (len % 4);
11290                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11291                         len += padlen;
11292                 }
11293                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11294         } else {
11295                 len = SCTP_BUF_LEN(mout);
11296                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11297         }
11298
11299         /* add checksum */
11300         abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
11301         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11302                 /* no mbuf's */
11303                 sctp_m_freem(mout);
11304                 return;
11305         }
11306         if (iph_out != NULL) {
11307                 sctp_route_t ro;
11308                 struct sctp_tcb *stcb = NULL;
11309                 int ret;
11310
11311                 /* zap the stack pointer to the route */
11312                 bzero(&ro, sizeof ro);
11313                 if (port) {
11314                         udp->uh_ulen = htons(len - sizeof(struct ip));
11315                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11316                 }
11317                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11318                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11319                 /* set IPv4 length */
11320                 iph_out->ip_len = len;
11321                 /* out it goes */
11322 #ifdef  SCTP_PACKET_LOGGING
11323                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11324                         sctp_packet_log(mout, len);
11325 #endif
11326                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11327                 if (port) {
11328                         SCTP_ENABLE_UDP_CSUM(o_pak);
11329                 }
11330                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
11331
11332                 /* Free the route if we got one back */
11333                 if (ro.ro_rt)
11334                         RTFREE(ro.ro_rt);
11335         }
11336 #ifdef INET6
11337         if (ip6_out != NULL) {
11338                 struct route_in6 ro;
11339                 int ret;
11340                 struct sctp_tcb *stcb = NULL;
11341                 struct ifnet *ifp = NULL;
11342
11343                 /* zap the stack pointer to the route */
11344                 bzero(&ro, sizeof(ro));
11345                 if (port) {
11346                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11347                 }
11348                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11349                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11350                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11351 #ifdef  SCTP_PACKET_LOGGING
11352                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11353                         sctp_packet_log(mout, len);
11354 #endif
11355                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11356                 if (port) {
11357                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11358                                 udp->uh_sum = 0xffff;
11359                         }
11360                 }
11361                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11362
11363                 /* Free the route if we got one back */
11364                 if (ro.ro_rt)
11365                         RTFREE(ro.ro_rt);
11366         }
11367 #endif
11368         SCTP_STAT_INCR(sctps_sendpackets);
11369         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11370 }
11371
11372 void
11373 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11374     uint32_t vrf_id, uint16_t port)
11375 {
11376         struct mbuf *o_pak;
11377         struct sctphdr *ihdr;
11378         int retcode;
11379         struct sctphdr *ohdr;
11380         struct sctp_chunkhdr *ophdr;
11381         struct ip *iph;
11382         struct udphdr *udp = NULL;
11383         struct mbuf *mout;
11384
11385 #ifdef SCTP_DEBUG
11386         struct sockaddr_in6 lsa6, fsa6;
11387
11388 #endif
11389         uint32_t val;
11390         struct mbuf *at;
11391         int len;
11392
11393         iph = mtod(m, struct ip *);
11394         ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
11395
11396         SCTP_BUF_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
11397         if (scm == NULL) {
11398                 /* can't send because we can't add a mbuf */
11399                 return;
11400         }
11401         ohdr = mtod(scm, struct sctphdr *);
11402         ohdr->src_port = ihdr->dest_port;
11403         ohdr->dest_port = ihdr->src_port;
11404         ohdr->v_tag = vtag;
11405         ohdr->checksum = 0;
11406         ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
11407         ophdr->chunk_type = SCTP_OPERATION_ERROR;
11408         ophdr->chunk_flags = 0;
11409         len = 0;
11410         at = scm;
11411         while (at) {
11412                 len += SCTP_BUF_LEN(at);
11413                 at = SCTP_BUF_NEXT(at);
11414         }
11415         ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
11416         if (len % 4) {
11417                 /* need padding */
11418                 uint32_t cpthis = 0;
11419                 int padlen;
11420
11421                 padlen = 4 - (len % 4);
11422                 m_copyback(scm, len, padlen, (caddr_t)&cpthis);
11423                 len += padlen;
11424         }
11425         val = sctp_calculate_sum(scm, NULL, 0);
11426 #ifdef INET6
11427         if (port) {
11428                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
11429         } else {
11430                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
11431         }
11432 #else
11433         if (port) {
11434                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
11435         } else {
11436                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
11437         }
11438 #endif
11439         if (mout == NULL) {
11440                 sctp_m_freem(scm);
11441                 return;
11442         }
11443         SCTP_BUF_NEXT(mout) = scm;
11444         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11445                 sctp_m_freem(mout);
11446                 return;
11447         }
11448         ohdr->checksum = val;
11449         switch (iph->ip_v) {
11450         case IPVERSION:
11451                 {
11452                         /* V4 */
11453                         struct ip *out;
11454                         sctp_route_t ro;
11455                         struct sctp_tcb *stcb = NULL;
11456
11457                         SCTP_BUF_LEN(mout) = sizeof(struct ip);
11458                         len += sizeof(struct ip);
11459                         if (port) {
11460                                 SCTP_BUF_LEN(mout) += sizeof(struct udphdr);
11461                                 len += sizeof(struct udphdr);
11462                         }
11463                         bzero(&ro, sizeof ro);
11464                         out = mtod(mout, struct ip *);
11465                         out->ip_v = iph->ip_v;
11466                         out->ip_hl = (sizeof(struct ip) / 4);
11467                         out->ip_tos = iph->ip_tos;
11468                         out->ip_id = iph->ip_id;
11469                         out->ip_off = 0;
11470                         out->ip_ttl = MAXTTL;
11471                         if (port) {
11472                                 out->ip_p = IPPROTO_UDP;
11473                         } else {
11474                                 out->ip_p = IPPROTO_SCTP;
11475                         }
11476                         out->ip_sum = 0;
11477                         out->ip_src = iph->ip_dst;
11478                         out->ip_dst = iph->ip_src;
11479                         out->ip_len = len;
11480                         if (port) {
11481                                 udp = (struct udphdr *)(out + 1);
11482                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11483                                 udp->uh_dport = port;
11484                                 udp->uh_ulen = htons(len - sizeof(struct ip));
11485                                 udp->uh_sum = in_pseudo(out->ip_src.s_addr, out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11486                         }
11487 #ifdef  SCTP_PACKET_LOGGING
11488                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11489                                 sctp_packet_log(mout, len);
11490 #endif
11491                         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11492                         if (port) {
11493                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11494                         }
11495                         SCTP_IP_OUTPUT(retcode, o_pak, &ro, stcb, vrf_id);
11496
11497                         SCTP_STAT_INCR(sctps_sendpackets);
11498                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11499                         /* Free the route if we got one back */
11500                         if (ro.ro_rt)
11501                                 RTFREE(ro.ro_rt);
11502                         break;
11503                 }
11504 #ifdef INET6
11505         case IPV6_VERSION >> 4:
11506                 {
11507                         /* V6 */
11508                         struct route_in6 ro;
11509                         int ret;
11510                         struct sctp_tcb *stcb = NULL;
11511                         struct ifnet *ifp = NULL;
11512                         struct ip6_hdr *out6, *in6;
11513
11514                         SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr);
11515                         len += sizeof(struct ip6_hdr);
11516                         bzero(&ro, sizeof ro);
11517                         if (port) {
11518                                 SCTP_BUF_LEN(mout) += sizeof(struct udphdr);
11519                                 len += sizeof(struct udphdr);
11520                         }
11521                         in6 = mtod(m, struct ip6_hdr *);
11522                         out6 = mtod(mout, struct ip6_hdr *);
11523                         out6->ip6_flow = in6->ip6_flow;
11524                         out6->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
11525                         if (port) {
11526                                 out6->ip6_nxt = IPPROTO_UDP;
11527                         } else {
11528                                 out6->ip6_nxt = IPPROTO_SCTP;
11529                         }
11530                         out6->ip6_src = in6->ip6_dst;
11531                         out6->ip6_dst = in6->ip6_src;
11532                         out6->ip6_plen = len - sizeof(struct ip6_hdr);
11533                         if (port) {
11534                                 udp = (struct udphdr *)(out6 + 1);
11535                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11536                                 udp->uh_dport = port;
11537                                 udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11538                                 udp->uh_sum = 0;
11539                         }
11540 #ifdef SCTP_DEBUG
11541                         bzero(&lsa6, sizeof(lsa6));
11542                         lsa6.sin6_len = sizeof(lsa6);
11543                         lsa6.sin6_family = AF_INET6;
11544                         lsa6.sin6_addr = out6->ip6_src;
11545                         bzero(&fsa6, sizeof(fsa6));
11546                         fsa6.sin6_len = sizeof(fsa6);
11547                         fsa6.sin6_family = AF_INET6;
11548                         fsa6.sin6_addr = out6->ip6_dst;
11549 #endif
11550                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_operr_to calling ipv6 output:\n");
11551                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "src: ");
11552                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&lsa6);
11553                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "dst ");
11554                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&fsa6);
11555
11556 #ifdef  SCTP_PACKET_LOGGING
11557                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11558                                 sctp_packet_log(mout, len);
11559 #endif
11560                         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11561                         if (port) {
11562                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11563                                         udp->uh_sum = 0xffff;
11564                                 }
11565                         }
11566                         SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11567
11568                         SCTP_STAT_INCR(sctps_sendpackets);
11569                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11570                         /* Free the route if we got one back */
11571                         if (ro.ro_rt)
11572                                 RTFREE(ro.ro_rt);
11573                         break;
11574                 }
11575 #endif                          /* INET6 */
11576         default:
11577                 /* TSNH */
11578                 break;
11579         }
11580 }
11581
11582 static struct mbuf *
11583 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11584     struct uio *uio,
11585     struct sctp_sndrcvinfo *srcv,
11586     int max_send_len,
11587     int user_marks_eor,
11588     int *error,
11589     uint32_t * sndout,
11590     struct mbuf **new_tail)
11591 {
11592         struct mbuf *m;
11593
11594         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11595             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11596         if (m == NULL) {
11597                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11598                 *error = ENOMEM;
11599         } else {
11600                 *sndout = m_length(m, NULL);
11601                 *new_tail = m_last(m);
11602         }
11603         return (m);
11604 }
11605
11606 static int
11607 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11608     struct uio *uio,
11609     int resv_upfront)
11610 {
11611         int left;
11612
11613         left = sp->length;
11614         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11615             resv_upfront, 0);
11616         if (sp->data == NULL) {
11617                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11618                 return (ENOMEM);
11619         }
11620         sp->tail_mbuf = m_last(sp->data);
11621         return (0);
11622 }
11623
11624
11625
11626 static struct sctp_stream_queue_pending *
11627 sctp_copy_it_in(struct sctp_tcb *stcb,
11628     struct sctp_association *asoc,
11629     struct sctp_sndrcvinfo *srcv,
11630     struct uio *uio,
11631     struct sctp_nets *net,
11632     int max_send_len,
11633     int user_marks_eor,
11634     int *error,
11635     int non_blocking)
11636 {
11637         /*-
11638          * This routine must be very careful in its work. Protocol
11639          * processing is up and running so care must be taken to spl...()
11640          * when you need to do something that may effect the stcb/asoc. The
11641          * sb is locked however. When data is copied the protocol processing
11642          * should be enabled since this is a slower operation...
11643          */
11644         struct sctp_stream_queue_pending *sp = NULL;
11645         int resv_in_first;
11646
11647         *error = 0;
11648         /* Now can we send this? */
11649         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11650             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11651             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11652             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11653                 /* got data while shutting down */
11654                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11655                 *error = ECONNRESET;
11656                 goto out_now;
11657         }
11658         sctp_alloc_a_strmoq(stcb, sp);
11659         if (sp == NULL) {
11660                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11661                 *error = ENOMEM;
11662                 goto out_now;
11663         }
11664         sp->act_flags = 0;
11665         sp->sender_all_done = 0;
11666         sp->sinfo_flags = srcv->sinfo_flags;
11667         sp->timetolive = srcv->sinfo_timetolive;
11668         sp->ppid = srcv->sinfo_ppid;
11669         sp->context = srcv->sinfo_context;
11670         sp->strseq = 0;
11671         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11672
11673         sp->stream = srcv->sinfo_stream;
11674         sp->length = min(uio->uio_resid, max_send_len);
11675         if ((sp->length == (uint32_t) uio->uio_resid) &&
11676             ((user_marks_eor == 0) ||
11677             (srcv->sinfo_flags & SCTP_EOF) ||
11678             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11679                 sp->msg_is_complete = 1;
11680         } else {
11681                 sp->msg_is_complete = 0;
11682         }
11683         sp->sender_all_done = 0;
11684         sp->some_taken = 0;
11685         sp->put_last_out = 0;
11686         resv_in_first = sizeof(struct sctp_data_chunk);
11687         sp->data = sp->tail_mbuf = NULL;
11688         *error = sctp_copy_one(sp, uio, resv_in_first);
11689         if (*error) {
11690                 sctp_free_a_strmoq(stcb, sp);
11691                 sp = NULL;
11692         } else {
11693                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
11694                         sp->net = net;
11695                         sp->addr_over = 1;
11696                 } else {
11697                         sp->net = asoc->primary_destination;
11698                         sp->addr_over = 0;
11699                 }
11700                 atomic_add_int(&sp->net->ref_count, 1);
11701                 sctp_set_prsctp_policy(stcb, sp);
11702         }
11703 out_now:
11704         return (sp);
11705 }
11706
11707
11708 int
11709 sctp_sosend(struct socket *so,
11710     struct sockaddr *addr,
11711     struct uio *uio,
11712     struct mbuf *top,
11713     struct mbuf *control,
11714     int flags,
11715     struct thread *p
11716 )
11717 {
11718         struct sctp_inpcb *inp;
11719         int error, use_rcvinfo = 0;
11720         struct sctp_sndrcvinfo srcv;
11721         struct sockaddr *addr_to_use;
11722
11723 #ifdef INET6
11724         struct sockaddr_in sin;
11725
11726 #endif
11727
11728         inp = (struct sctp_inpcb *)so->so_pcb;
11729         if (control) {
11730                 /* process cmsg snd/rcv info (maybe a assoc-id) */
11731                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
11732                     sizeof(srcv))) {
11733                         /* got one */
11734                         use_rcvinfo = 1;
11735                 }
11736         }
11737         addr_to_use = addr;
11738 #ifdef INET6
11739         if ((addr) && (addr->sa_family == AF_INET6)) {
11740                 struct sockaddr_in6 *sin6;
11741
11742                 sin6 = (struct sockaddr_in6 *)addr;
11743                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
11744                         in6_sin6_2_sin(&sin, sin6);
11745                         addr_to_use = (struct sockaddr *)&sin;
11746                 }
11747         }
11748 #endif
11749         error = sctp_lower_sosend(so, addr_to_use, uio, top,
11750             control,
11751             flags,
11752             use_rcvinfo, &srcv
11753             ,p
11754             );
11755         return (error);
11756 }
11757
11758
11759 int
11760 sctp_lower_sosend(struct socket *so,
11761     struct sockaddr *addr,
11762     struct uio *uio,
11763     struct mbuf *i_pak,
11764     struct mbuf *control,
11765     int flags,
11766     int use_rcvinfo,
11767     struct sctp_sndrcvinfo *srcv
11768     ,
11769     struct thread *p
11770 )
11771 {
11772         unsigned int sndlen = 0, max_len;
11773         int error, len;
11774         struct mbuf *top = NULL;
11775         int queue_only = 0, queue_only_for_init = 0;
11776         int free_cnt_applied = 0;
11777         int un_sent = 0;
11778         int now_filled = 0;
11779         unsigned int inqueue_bytes = 0;
11780         struct sctp_block_entry be;
11781         struct sctp_inpcb *inp;
11782         struct sctp_tcb *stcb = NULL;
11783         struct timeval now;
11784         struct sctp_nets *net;
11785         struct sctp_association *asoc;
11786         struct sctp_inpcb *t_inp;
11787         int user_marks_eor;
11788         int create_lock_applied = 0;
11789         int nagle_applies = 0;
11790         int some_on_control = 0;
11791         int got_all_of_the_send = 0;
11792         int hold_tcblock = 0;
11793         int non_blocking = 0;
11794         int temp_flags = 0;
11795         uint32_t local_add_more, local_soresv = 0;
11796
11797         error = 0;
11798         net = NULL;
11799         stcb = NULL;
11800         asoc = NULL;
11801
11802         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
11803         if (inp == NULL) {
11804                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11805                 error = EFAULT;
11806                 if (i_pak) {
11807                         SCTP_RELEASE_PKT(i_pak);
11808                 }
11809                 return (error);
11810         }
11811         if ((uio == NULL) && (i_pak == NULL)) {
11812                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11813                 return (EINVAL);
11814         }
11815         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
11816         atomic_add_int(&inp->total_sends, 1);
11817         if (uio) {
11818                 if (uio->uio_resid < 0) {
11819                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11820                         return (EINVAL);
11821                 }
11822                 sndlen = uio->uio_resid;
11823         } else {
11824                 top = SCTP_HEADER_TO_CHAIN(i_pak);
11825                 sndlen = SCTP_HEADER_LEN(i_pak);
11826         }
11827         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
11828             addr,
11829             sndlen);
11830         /*-
11831          * Pre-screen address, if one is given the sin-len
11832          * must be set correctly!
11833          */
11834         if (addr) {
11835                 if ((addr->sa_family == AF_INET) &&
11836                     (addr->sa_len != sizeof(struct sockaddr_in))) {
11837                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11838                         error = EINVAL;
11839                         goto out_unlocked;
11840                 } else if ((addr->sa_family == AF_INET6) &&
11841                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
11842                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11843                         error = EINVAL;
11844                         goto out_unlocked;
11845                 }
11846         }
11847         hold_tcblock = 0;
11848
11849         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
11850             (inp->sctp_socket->so_qlimit)) {
11851                 /* The listener can NOT send */
11852                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11853                 error = EFAULT;
11854                 goto out_unlocked;
11855         }
11856         if ((use_rcvinfo) && srcv) {
11857                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
11858                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
11859                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11860                         error = EINVAL;
11861                         goto out_unlocked;
11862                 }
11863                 if (srcv->sinfo_flags)
11864                         SCTP_STAT_INCR(sctps_sends_with_flags);
11865
11866                 if (srcv->sinfo_flags & SCTP_SENDALL) {
11867                         /* its a sendall */
11868                         error = sctp_sendall(inp, uio, top, srcv);
11869                         top = NULL;
11870                         goto out_unlocked;
11871                 }
11872         }
11873         /* now we must find the assoc */
11874         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
11875             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
11876                 SCTP_INP_RLOCK(inp);
11877                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
11878                 if (stcb == NULL) {
11879                         SCTP_INP_RUNLOCK(inp);
11880                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11881                         error = ENOTCONN;
11882                         goto out_unlocked;
11883                 }
11884                 hold_tcblock = 0;
11885                 SCTP_INP_RUNLOCK(inp);
11886                 if (addr) {
11887                         /* Must locate the net structure if addr given */
11888                         net = sctp_findnet(stcb, addr);
11889                         if (net) {
11890                                 /* validate port was 0 or correct */
11891                                 struct sockaddr_in *sin;
11892
11893                                 sin = (struct sockaddr_in *)addr;
11894                                 if ((sin->sin_port != 0) &&
11895                                     (sin->sin_port != stcb->rport)) {
11896                                         net = NULL;
11897                                 }
11898                         }
11899                         temp_flags |= SCTP_ADDR_OVER;
11900                 } else
11901                         net = stcb->asoc.primary_destination;
11902                 if (addr && (net == NULL)) {
11903                         /* Could not find address, was it legal */
11904                         if (addr->sa_family == AF_INET) {
11905                                 struct sockaddr_in *sin;
11906
11907                                 sin = (struct sockaddr_in *)addr;
11908                                 if (sin->sin_addr.s_addr == 0) {
11909                                         if ((sin->sin_port == 0) ||
11910                                             (sin->sin_port == stcb->rport)) {
11911                                                 net = stcb->asoc.primary_destination;
11912                                         }
11913                                 }
11914                         } else {
11915                                 struct sockaddr_in6 *sin6;
11916
11917                                 sin6 = (struct sockaddr_in6 *)addr;
11918                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
11919                                         if ((sin6->sin6_port == 0) ||
11920                                             (sin6->sin6_port == stcb->rport)) {
11921                                                 net = stcb->asoc.primary_destination;
11922                                         }
11923                                 }
11924                         }
11925                 }
11926                 if (net == NULL) {
11927                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11928                         error = EINVAL;
11929                         goto out_unlocked;
11930                 }
11931         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
11932                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
11933                 if (stcb) {
11934                         if (addr)
11935                                 /*
11936                                  * Must locate the net structure if addr
11937                                  * given
11938                                  */
11939                                 net = sctp_findnet(stcb, addr);
11940                         else
11941                                 net = stcb->asoc.primary_destination;
11942                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
11943                             ((net == NULL) || (addr == NULL))) {
11944                                 struct sockaddr_in *sin;
11945
11946                                 if (addr == NULL) {
11947                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11948                                         error = EINVAL;
11949                                         goto out_unlocked;
11950                                 }
11951                                 sin = (struct sockaddr_in *)addr;
11952                                 /* Validate port is 0 or correct */
11953                                 if ((sin->sin_port != 0) &&
11954                                     (sin->sin_port != stcb->rport)) {
11955                                         net = NULL;
11956                                 }
11957                         }
11958                 }
11959                 hold_tcblock = 0;
11960         } else if (addr) {
11961                 /*-
11962                  * Since we did not use findep we must
11963                  * increment it, and if we don't find a tcb
11964                  * decrement it.
11965                  */
11966                 SCTP_INP_WLOCK(inp);
11967                 SCTP_INP_INCR_REF(inp);
11968                 SCTP_INP_WUNLOCK(inp);
11969                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11970                 if (stcb == NULL) {
11971                         SCTP_INP_WLOCK(inp);
11972                         SCTP_INP_DECR_REF(inp);
11973                         SCTP_INP_WUNLOCK(inp);
11974                 } else {
11975                         hold_tcblock = 1;
11976                 }
11977         }
11978         if ((stcb == NULL) && (addr)) {
11979                 /* Possible implicit send? */
11980                 SCTP_ASOC_CREATE_LOCK(inp);
11981                 create_lock_applied = 1;
11982                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
11983                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
11984                         /* Should I really unlock ? */
11985                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11986                         error = EFAULT;
11987                         goto out_unlocked;
11988
11989                 }
11990                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
11991                     (addr->sa_family == AF_INET6)) {
11992                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11993                         error = EINVAL;
11994                         goto out_unlocked;
11995                 }
11996                 SCTP_INP_WLOCK(inp);
11997                 SCTP_INP_INCR_REF(inp);
11998                 SCTP_INP_WUNLOCK(inp);
11999                 /* With the lock applied look again */
12000                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12001                 if (stcb == NULL) {
12002                         SCTP_INP_WLOCK(inp);
12003                         SCTP_INP_DECR_REF(inp);
12004                         SCTP_INP_WUNLOCK(inp);
12005                 } else {
12006                         hold_tcblock = 1;
12007                 }
12008                 if (t_inp != inp) {
12009                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12010                         error = ENOTCONN;
12011                         goto out_unlocked;
12012                 }
12013         }
12014         if (stcb == NULL) {
12015                 if (addr == NULL) {
12016                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12017                         error = ENOENT;
12018                         goto out_unlocked;
12019                 } else {
12020                         /*
12021                          * UDP style, we must go ahead and start the INIT
12022                          * process
12023                          */
12024                         uint32_t vrf_id;
12025
12026                         if ((use_rcvinfo) && (srcv) &&
12027                             ((srcv->sinfo_flags & SCTP_ABORT) ||
12028                             ((srcv->sinfo_flags & SCTP_EOF) &&
12029                             (sndlen == 0)))) {
12030                                 /*-
12031                                  * User asks to abort a non-existant assoc,
12032                                  * or EOF a non-existant assoc with no data
12033                                  */
12034                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12035                                 error = ENOENT;
12036                                 goto out_unlocked;
12037                         }
12038                         /* get an asoc/stcb struct */
12039                         vrf_id = inp->def_vrf_id;
12040 #ifdef INVARIANTS
12041                         if (create_lock_applied == 0) {
12042                                 panic("Error, should hold create lock and I don't?");
12043                         }
12044 #endif
12045                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
12046                             p
12047                             );
12048                         if (stcb == NULL) {
12049                                 /* Error is setup for us in the call */
12050                                 goto out_unlocked;
12051                         }
12052                         if (create_lock_applied) {
12053                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12054                                 create_lock_applied = 0;
12055                         } else {
12056                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12057                         }
12058                         /*
12059                          * Turn on queue only flag to prevent data from
12060                          * being sent
12061                          */
12062                         queue_only = 1;
12063                         asoc = &stcb->asoc;
12064                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12065                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12066
12067                         /* initialize authentication params for the assoc */
12068                         sctp_initialize_auth_params(inp, stcb);
12069
12070                         if (control) {
12071                                 /*
12072                                  * see if a init structure exists in cmsg
12073                                  * headers
12074                                  */
12075                                 struct sctp_initmsg initm;
12076                                 int i;
12077
12078                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12079                                     sizeof(initm))) {
12080                                         /*
12081                                          * we have an INIT override of the
12082                                          * default
12083                                          */
12084                                         if (initm.sinit_max_attempts)
12085                                                 asoc->max_init_times = initm.sinit_max_attempts;
12086                                         if (initm.sinit_num_ostreams)
12087                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12088                                         if (initm.sinit_max_instreams)
12089                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12090                                         if (initm.sinit_max_init_timeo)
12091                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12092                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12093                                                 /* Default is NOT correct */
12094                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12095                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12096                                                 /*
12097                                                  * What happens if this
12098                                                  * fails? we panic ...
12099                                                  */
12100                                                 {
12101                                                         struct sctp_stream_out *tmp_str;
12102                                                         int had_lock = 0;
12103
12104                                                         if (hold_tcblock) {
12105                                                                 had_lock = 1;
12106                                                                 SCTP_TCB_UNLOCK(stcb);
12107                                                         }
12108                                                         SCTP_MALLOC(tmp_str,
12109                                                             struct sctp_stream_out *,
12110                                                             (asoc->pre_open_streams *
12111                                                             sizeof(struct sctp_stream_out)),
12112                                                             SCTP_M_STRMO);
12113                                                         if (had_lock) {
12114                                                                 SCTP_TCB_LOCK(stcb);
12115                                                         }
12116                                                         if (tmp_str != NULL) {
12117                                                                 SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12118                                                                 asoc->strmout = tmp_str;
12119                                                                 asoc->streamoutcnt = asoc->pre_open_streams;
12120                                                         } else {
12121                                                                 asoc->pre_open_streams = asoc->streamoutcnt;
12122                                                         }
12123                                                 }
12124                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12125                                                         /*-
12126                                                          * inbound side must be set
12127                                                          * to 0xffff, also NOTE when
12128                                                          * we get the INIT-ACK back
12129                                                          * (for INIT sender) we MUST
12130                                                          * reduce the count
12131                                                          * (streamoutcnt) but first
12132                                                          * check if we sent to any
12133                                                          * of the upper streams that
12134                                                          * were dropped (if some
12135                                                          * were). Those that were
12136                                                          * dropped must be notified
12137                                                          * to the upper layer as
12138                                                          * failed to send.
12139                                                          */
12140                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12141                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12142                                                         asoc->strmout[i].stream_no = i;
12143                                                         asoc->strmout[i].last_msg_incomplete = 0;
12144                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12145                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12146                                                 }
12147                                         }
12148                                 }
12149                         }
12150                         hold_tcblock = 1;
12151                         /* out with the INIT */
12152                         queue_only_for_init = 1;
12153                         /*-
12154                          * we may want to dig in after this call and adjust the MTU
12155                          * value. It defaulted to 1500 (constant) but the ro
12156                          * structure may now have an update and thus we may need to
12157                          * change it BEFORE we append the message.
12158                          */
12159                         net = stcb->asoc.primary_destination;
12160                         asoc = &stcb->asoc;
12161                 }
12162         }
12163         if ((SCTP_SO_IS_NBIO(so)
12164             || (flags & MSG_NBIO)
12165             )) {
12166                 non_blocking = 1;
12167         }
12168         asoc = &stcb->asoc;
12169
12170         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12171                 if (sndlen > asoc->smallest_mtu) {
12172                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12173                         error = EMSGSIZE;
12174                         goto out_unlocked;
12175                 }
12176         }
12177         /* would we block? */
12178         if (non_blocking) {
12179                 if (hold_tcblock == 0) {
12180                         SCTP_TCB_LOCK(stcb);
12181                         hold_tcblock = 1;
12182                 }
12183                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12184                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12185                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12186                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12187                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12188                                 error = EMSGSIZE;
12189                         else
12190                                 error = EWOULDBLOCK;
12191                         goto out_unlocked;
12192                 }
12193                 stcb->asoc.sb_send_resv += sndlen;
12194                 SCTP_TCB_UNLOCK(stcb);
12195                 hold_tcblock = 0;
12196         } else {
12197                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12198         }
12199         local_soresv = sndlen;
12200         /* Keep the stcb from being freed under our feet */
12201         if (free_cnt_applied) {
12202 #ifdef INVARIANTS
12203                 panic("refcnt already incremented");
12204 #else
12205                 printf("refcnt:1 already incremented?\n");
12206 #endif
12207         } else {
12208                 atomic_add_int(&stcb->asoc.refcnt, 1);
12209                 free_cnt_applied = 1;
12210         }
12211         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12212                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12213                 error = ECONNRESET;
12214                 goto out_unlocked;
12215         }
12216         if (create_lock_applied) {
12217                 SCTP_ASOC_CREATE_UNLOCK(inp);
12218                 create_lock_applied = 0;
12219         }
12220         if (asoc->stream_reset_outstanding) {
12221                 /*
12222                  * Can't queue any data while stream reset is underway.
12223                  */
12224                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12225                 error = EAGAIN;
12226                 goto out_unlocked;
12227         }
12228         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12229             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12230                 queue_only = 1;
12231         }
12232         if ((use_rcvinfo == 0) || (srcv == NULL)) {
12233                 /* Grab the default stuff from the asoc */
12234                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
12235         }
12236         /* we are now done with all control */
12237         if (control) {
12238                 sctp_m_freem(control);
12239                 control = NULL;
12240         }
12241         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12242             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12243             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12244             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12245                 if ((use_rcvinfo) &&
12246                     (srcv->sinfo_flags & SCTP_ABORT)) {
12247                         ;
12248                 } else {
12249                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12250                         error = ECONNRESET;
12251                         goto out_unlocked;
12252                 }
12253         }
12254         /* Ok, we will attempt a msgsnd :> */
12255         if (p) {
12256                 p->td_ru.ru_msgsnd++;
12257         }
12258         if (stcb) {
12259                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
12260                         net = stcb->asoc.primary_destination;
12261                 }
12262         }
12263         if (net == NULL) {
12264                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12265                 error = EINVAL;
12266                 goto out_unlocked;
12267         }
12268         if ((net->flight_size > net->cwnd) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12269                 /*-
12270                  * CMT: Added check for CMT above. net above is the primary
12271                  * dest. If CMT is ON, sender should always attempt to send
12272                  * with the output routine sctp_fill_outqueue() that loops
12273                  * through all destination addresses. Therefore, if CMT is
12274                  * ON, queue_only is NOT set to 1 here, so that
12275                  * sctp_chunk_output() can be called below.
12276                  */
12277                 queue_only = 1;
12278
12279         } else if (asoc->ifp_had_enobuf) {
12280                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12281                 if (net->flight_size > (net->mtu * 2))
12282                         queue_only = 1;
12283                 asoc->ifp_had_enobuf = 0;
12284         } else {
12285                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12286                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12287         }
12288         /* Are we aborting? */
12289         if (srcv->sinfo_flags & SCTP_ABORT) {
12290                 struct mbuf *mm;
12291                 int tot_demand, tot_out = 0, max_out;
12292
12293                 SCTP_STAT_INCR(sctps_sends_with_abort);
12294                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12295                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12296                         /* It has to be up before we abort */
12297                         /* how big is the user initiated abort? */
12298                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12299                         error = EINVAL;
12300                         goto out;
12301                 }
12302                 if (hold_tcblock) {
12303                         SCTP_TCB_UNLOCK(stcb);
12304                         hold_tcblock = 0;
12305                 }
12306                 if (top) {
12307                         struct mbuf *cntm = NULL;
12308
12309                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12310                         if (sndlen != 0) {
12311                                 cntm = top;
12312                                 while (cntm) {
12313                                         tot_out += SCTP_BUF_LEN(cntm);
12314                                         cntm = SCTP_BUF_NEXT(cntm);
12315                                 }
12316                         }
12317                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12318                 } else {
12319                         /* Must fit in a MTU */
12320                         tot_out = sndlen;
12321                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12322                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12323                                 /* To big */
12324                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12325                                 error = EMSGSIZE;
12326                                 goto out;
12327                         }
12328                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12329                 }
12330                 if (mm == NULL) {
12331                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12332                         error = ENOMEM;
12333                         goto out;
12334                 }
12335                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12336                 max_out -= sizeof(struct sctp_abort_msg);
12337                 if (tot_out > max_out) {
12338                         tot_out = max_out;
12339                 }
12340                 if (mm) {
12341                         struct sctp_paramhdr *ph;
12342
12343                         /* now move forward the data pointer */
12344                         ph = mtod(mm, struct sctp_paramhdr *);
12345                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12346                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12347                         ph++;
12348                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12349                         if (top == NULL) {
12350                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12351                                 if (error) {
12352                                         /*-
12353                                          * Here if we can't get his data we
12354                                          * still abort we just don't get to
12355                                          * send the users note :-0
12356                                          */
12357                                         sctp_m_freem(mm);
12358                                         mm = NULL;
12359                                 }
12360                         } else {
12361                                 if (sndlen != 0) {
12362                                         SCTP_BUF_NEXT(mm) = top;
12363                                 }
12364                         }
12365                 }
12366                 if (hold_tcblock == 0) {
12367                         SCTP_TCB_LOCK(stcb);
12368                         hold_tcblock = 1;
12369                 }
12370                 atomic_add_int(&stcb->asoc.refcnt, -1);
12371                 free_cnt_applied = 0;
12372                 /* release this lock, otherwise we hang on ourselves */
12373                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12374                     SCTP_RESPONSE_TO_USER_REQ,
12375                     mm, SCTP_SO_LOCKED);
12376                 /* now relock the stcb so everything is sane */
12377                 hold_tcblock = 0;
12378                 stcb = NULL;
12379                 /*
12380                  * In this case top is already chained to mm avoid double
12381                  * free, since we free it below if top != NULL and driver
12382                  * would free it after sending the packet out
12383                  */
12384                 if (sndlen != 0) {
12385                         top = NULL;
12386                 }
12387                 goto out_unlocked;
12388         }
12389         /* Calculate the maximum we can send */
12390         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12391         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12392                 if (non_blocking) {
12393                         /* we already checked for non-blocking above. */
12394                         max_len = sndlen;
12395                 } else {
12396                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12397                 }
12398         } else {
12399                 max_len = 0;
12400         }
12401         if (hold_tcblock) {
12402                 SCTP_TCB_UNLOCK(stcb);
12403                 hold_tcblock = 0;
12404         }
12405         /* Is the stream no. valid? */
12406         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12407                 /* Invalid stream number */
12408                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12409                 error = EINVAL;
12410                 goto out_unlocked;
12411         }
12412         if (asoc->strmout == NULL) {
12413                 /* huh? software error */
12414                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12415                 error = EFAULT;
12416                 goto out_unlocked;
12417         }
12418         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12419         if ((user_marks_eor == 0) &&
12420             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12421                 /* It will NEVER fit */
12422                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12423                 error = EMSGSIZE;
12424                 goto out_unlocked;
12425         }
12426         if ((uio == NULL) && user_marks_eor) {
12427                 /*-
12428                  * We do not support eeor mode for
12429                  * sending with mbuf chains (like sendfile).
12430                  */
12431                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12432                 error = EINVAL;
12433                 goto out_unlocked;
12434         }
12435         if (user_marks_eor) {
12436                 local_add_more = SCTP_BASE_SYSCTL(sctp_add_more_threshold);
12437         } else {
12438                 /*-
12439                  * For non-eeor the whole message must fit in
12440                  * the socket send buffer.
12441                  */
12442                 local_add_more = sndlen;
12443         }
12444         len = 0;
12445         if (non_blocking) {
12446                 goto skip_preblock;
12447         }
12448         if (((max_len <= local_add_more) &&
12449             (SCTP_SB_LIMIT_SND(so) > local_add_more)) ||
12450             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {   /* if */
12451                 /* No room right now ! */
12452                 SOCKBUF_LOCK(&so->so_snd);
12453                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12454                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12455                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue) /* while */ )) {
12456
12457                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12458                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA,
12459                                     so, asoc, sndlen);
12460                         }
12461                         be.error = 0;
12462                         stcb->block_entry = &be;
12463                         error = sbwait(&so->so_snd);
12464                         stcb->block_entry = NULL;
12465                         if (error || so->so_error || be.error) {
12466                                 if (error == 0) {
12467                                         if (so->so_error)
12468                                                 error = so->so_error;
12469                                         if (be.error) {
12470                                                 error = be.error;
12471                                         }
12472                                 }
12473                                 SOCKBUF_UNLOCK(&so->so_snd);
12474                                 goto out_unlocked;
12475                         }
12476                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12477                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12478                                     so, asoc, stcb->asoc.total_output_queue_size);
12479                         }
12480                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12481                                 goto out_unlocked;
12482                         }
12483                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12484                 }
12485                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12486                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12487                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12488                 } else {
12489                         max_len = 0;
12490                 }
12491                 SOCKBUF_UNLOCK(&so->so_snd);
12492         }
12493 skip_preblock:
12494         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12495                 goto out_unlocked;
12496         }
12497         atomic_add_int(&stcb->total_sends, 1);
12498         /*
12499          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12500          * case NOTE: uio will be null when top/mbuf is passed
12501          */
12502         if (sndlen == 0) {
12503                 if (srcv->sinfo_flags & SCTP_EOF) {
12504                         got_all_of_the_send = 1;
12505                         goto dataless_eof;
12506                 } else {
12507                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12508                         error = EINVAL;
12509                         goto out;
12510                 }
12511         }
12512         if (top == NULL) {
12513                 struct sctp_stream_queue_pending *sp;
12514                 struct sctp_stream_out *strm;
12515                 uint32_t sndout, initial_out;
12516
12517                 initial_out = uio->uio_resid;
12518
12519                 SCTP_TCB_SEND_LOCK(stcb);
12520                 if ((asoc->stream_locked) &&
12521                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12522                         SCTP_TCB_SEND_UNLOCK(stcb);
12523                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12524                         error = EINVAL;
12525                         goto out;
12526                 }
12527                 SCTP_TCB_SEND_UNLOCK(stcb);
12528
12529                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12530                 if (strm->last_msg_incomplete == 0) {
12531         do_a_copy_in:
12532                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12533                         if ((sp == NULL) || (error)) {
12534                                 goto out;
12535                         }
12536                         SCTP_TCB_SEND_LOCK(stcb);
12537                         if (sp->msg_is_complete) {
12538                                 strm->last_msg_incomplete = 0;
12539                                 asoc->stream_locked = 0;
12540                         } else {
12541                                 /*
12542                                  * Just got locked to this guy in case of an
12543                                  * interrupt.
12544                                  */
12545                                 strm->last_msg_incomplete = 1;
12546                                 asoc->stream_locked = 1;
12547                                 asoc->stream_locked_on = srcv->sinfo_stream;
12548                                 sp->sender_all_done = 0;
12549                         }
12550                         sctp_snd_sb_alloc(stcb, sp->length);
12551                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12552                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12553                                 sp->strseq = strm->next_sequence_sent;
12554                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12555                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12556                                             (uintptr_t) stcb, sp->length,
12557                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12558                                 }
12559                                 strm->next_sequence_sent++;
12560                         } else {
12561                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12562                         }
12563                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12564                         if ((strm->next_spoke.tqe_next == NULL) &&
12565                             (strm->next_spoke.tqe_prev == NULL)) {
12566                                 /* Not on wheel, insert */
12567                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
12568                         }
12569                         SCTP_TCB_SEND_UNLOCK(stcb);
12570                 } else {
12571                         SCTP_TCB_SEND_LOCK(stcb);
12572                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12573                         SCTP_TCB_SEND_UNLOCK(stcb);
12574                         if (sp == NULL) {
12575                                 /* ???? Huh ??? last msg is gone */
12576 #ifdef INVARIANTS
12577                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12578 #else
12579                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12580                                 strm->last_msg_incomplete = 0;
12581 #endif
12582                                 goto do_a_copy_in;
12583
12584                         }
12585                 }
12586                 while (uio->uio_resid > 0) {
12587                         /* How much room do we have? */
12588                         struct mbuf *new_tail, *mm;
12589
12590                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12591                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12592                         else
12593                                 max_len = 0;
12594
12595                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12596                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12597                             (uio->uio_resid &&
12598                             (uio->uio_resid <= (int)max_len))) {
12599                                 sndout = 0;
12600                                 new_tail = NULL;
12601                                 if (hold_tcblock) {
12602                                         SCTP_TCB_UNLOCK(stcb);
12603                                         hold_tcblock = 0;
12604                                 }
12605                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12606                                 if ((mm == NULL) || error) {
12607                                         if (mm) {
12608                                                 sctp_m_freem(mm);
12609                                         }
12610                                         goto out;
12611                                 }
12612                                 /* Update the mbuf and count */
12613                                 SCTP_TCB_SEND_LOCK(stcb);
12614                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12615                                         /*
12616                                          * we need to get out. Peer probably
12617                                          * aborted.
12618                                          */
12619                                         sctp_m_freem(mm);
12620                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12621                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12622                                                 error = ECONNRESET;
12623                                         }
12624                                         SCTP_TCB_SEND_UNLOCK(stcb);
12625                                         goto out;
12626                                 }
12627                                 if (sp->tail_mbuf) {
12628                                         /* tack it to the end */
12629                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12630                                         sp->tail_mbuf = new_tail;
12631                                 } else {
12632                                         /* A stolen mbuf */
12633                                         sp->data = mm;
12634                                         sp->tail_mbuf = new_tail;
12635                                 }
12636                                 sctp_snd_sb_alloc(stcb, sndout);
12637                                 atomic_add_int(&sp->length, sndout);
12638                                 len += sndout;
12639
12640                                 /* Did we reach EOR? */
12641                                 if ((uio->uio_resid == 0) &&
12642                                     ((user_marks_eor == 0) ||
12643                                     (srcv->sinfo_flags & SCTP_EOF) ||
12644                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
12645                                     ) {
12646                                         sp->msg_is_complete = 1;
12647                                 } else {
12648                                         sp->msg_is_complete = 0;
12649                                 }
12650                                 SCTP_TCB_SEND_UNLOCK(stcb);
12651                         }
12652                         if (uio->uio_resid == 0) {
12653                                 /* got it all? */
12654                                 continue;
12655                         }
12656                         /* PR-SCTP? */
12657                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12658                                 /*
12659                                  * This is ugly but we must assure locking
12660                                  * order
12661                                  */
12662                                 if (hold_tcblock == 0) {
12663                                         SCTP_TCB_LOCK(stcb);
12664                                         hold_tcblock = 1;
12665                                 }
12666                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12667                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12668                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12669                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12670                                 else
12671                                         max_len = 0;
12672                                 if (max_len > 0) {
12673                                         continue;
12674                                 }
12675                                 SCTP_TCB_UNLOCK(stcb);
12676                                 hold_tcblock = 0;
12677                         }
12678                         /* wait for space now */
12679                         if (non_blocking) {
12680                                 /* Non-blocking io in place out */
12681                                 goto skip_out_eof;
12682                         }
12683                         if ((net->flight_size > net->cwnd) &&
12684                             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12685                                 queue_only = 1;
12686                         } else if (asoc->ifp_had_enobuf) {
12687                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12688                                 if (net->flight_size > (net->mtu * 2)) {
12689                                         queue_only = 1;
12690                                 } else {
12691                                         queue_only = 0;
12692                                 }
12693                                 asoc->ifp_had_enobuf = 0;
12694                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12695                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12696                         } else {
12697                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12698                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12699                                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12700                                         queue_only = 1;
12701                                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12702                                 } else if (net->flight_size > net->cwnd) {
12703                                         queue_only = 1;
12704                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12705                                 } else {
12706                                         queue_only = 0;
12707                                 }
12708                         }
12709                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12710                             (stcb->asoc.total_flight > 0) &&
12711                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12712                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12713                             ) {
12714
12715                                 /*-
12716                                  * Ok, Nagle is set on and we have data outstanding.
12717                                  * Don't send anything and let SACKs drive out the
12718                                  * data unless wen have a "full" segment to send.
12719                                  */
12720                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12721                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12722                                 }
12723                                 SCTP_STAT_INCR(sctps_naglequeued);
12724                                 nagle_applies = 1;
12725                         } else {
12726                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12727                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12728                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12729                                 }
12730                                 SCTP_STAT_INCR(sctps_naglesent);
12731                                 nagle_applies = 0;
12732                         }
12733                         /* What about the INIT, send it maybe */
12734                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12735
12736                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12737                                     nagle_applies, un_sent);
12738                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12739                                     stcb->asoc.total_flight,
12740                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12741                         }
12742                         if (queue_only_for_init) {
12743                                 if (hold_tcblock == 0) {
12744                                         SCTP_TCB_LOCK(stcb);
12745                                         hold_tcblock = 1;
12746                                 }
12747                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12748                                         /* a collision took us forward? */
12749                                         queue_only_for_init = 0;
12750                                         queue_only = 0;
12751                                 } else {
12752                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12753                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12754                                         queue_only_for_init = 0;
12755                                         queue_only = 1;
12756                                 }
12757                         }
12758                         if ((queue_only == 0) && (nagle_applies == 0)
12759                             ) {
12760                                 /*-
12761                                  * need to start chunk output
12762                                  * before blocking.. note that if
12763                                  * a lock is already applied, then
12764                                  * the input via the net is happening
12765                                  * and I don't need to start output :-D
12766                                  */
12767                                 if (hold_tcblock == 0) {
12768                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12769                                                 hold_tcblock = 1;
12770                                                 sctp_chunk_output(inp,
12771                                                     stcb,
12772                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12773                                         }
12774                                 } else {
12775                                         sctp_chunk_output(inp,
12776                                             stcb,
12777                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12778                                 }
12779                                 if (hold_tcblock == 1) {
12780                                         SCTP_TCB_UNLOCK(stcb);
12781                                         hold_tcblock = 0;
12782                                 }
12783                         }
12784                         SOCKBUF_LOCK(&so->so_snd);
12785                         /*-
12786                          * This is a bit strange, but I think it will
12787                          * work. The total_output_queue_size is locked and
12788                          * protected by the TCB_LOCK, which we just released.
12789                          * There is a race that can occur between releasing it
12790                          * above, and me getting the socket lock, where sacks
12791                          * come in but we have not put the SB_WAIT on the
12792                          * so_snd buffer to get the wakeup. After the LOCK
12793                          * is applied the sack_processing will also need to
12794                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12795                          * once we have the socket buffer lock if we recheck the
12796                          * size we KNOW we will get to sleep safely with the
12797                          * wakeup flag in place.
12798                          */
12799                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12800                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))
12801                             ) {
12802                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12803                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12804                                             so, asoc, uio->uio_resid);
12805                                 }
12806                                 be.error = 0;
12807                                 stcb->block_entry = &be;
12808                                 error = sbwait(&so->so_snd);
12809                                 stcb->block_entry = NULL;
12810
12811                                 if (error || so->so_error || be.error) {
12812                                         if (error == 0) {
12813                                                 if (so->so_error)
12814                                                         error = so->so_error;
12815                                                 if (be.error) {
12816                                                         error = be.error;
12817                                                 }
12818                                         }
12819                                         SOCKBUF_UNLOCK(&so->so_snd);
12820                                         goto out_unlocked;
12821                                 }
12822                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12823                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12824                                             so, asoc, stcb->asoc.total_output_queue_size);
12825                                 }
12826                         }
12827                         SOCKBUF_UNLOCK(&so->so_snd);
12828                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12829                                 goto out_unlocked;
12830                         }
12831                 }
12832                 SCTP_TCB_SEND_LOCK(stcb);
12833                 if (sp) {
12834                         if (sp->msg_is_complete == 0) {
12835                                 strm->last_msg_incomplete = 1;
12836                                 asoc->stream_locked = 1;
12837                                 asoc->stream_locked_on = srcv->sinfo_stream;
12838                         } else {
12839                                 sp->sender_all_done = 1;
12840                                 strm->last_msg_incomplete = 0;
12841                                 asoc->stream_locked = 0;
12842                         }
12843                 } else {
12844                         SCTP_PRINTF("Huh no sp TSNH?\n");
12845                         strm->last_msg_incomplete = 0;
12846                         asoc->stream_locked = 0;
12847                 }
12848                 SCTP_TCB_SEND_UNLOCK(stcb);
12849                 if (uio->uio_resid == 0) {
12850                         got_all_of_the_send = 1;
12851                 }
12852         } else if (top) {
12853                 /* We send in a 0, since we do NOT have any locks */
12854                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12855                 top = NULL;
12856                 if (srcv->sinfo_flags & SCTP_EOF) {
12857                         /*
12858                          * This should only happen for Panda for the mbuf
12859                          * send case, which does NOT yet support EEOR mode.
12860                          * Thus, we can just set this flag to do the proper
12861                          * EOF handling.
12862                          */
12863                         got_all_of_the_send = 1;
12864                 }
12865         }
12866         if (error) {
12867                 goto out;
12868         }
12869 dataless_eof:
12870         /* EOF thing ? */
12871         if ((srcv->sinfo_flags & SCTP_EOF) &&
12872             (got_all_of_the_send == 1) &&
12873             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)
12874             ) {
12875                 int cnt;
12876
12877                 SCTP_STAT_INCR(sctps_sends_with_eof);
12878                 error = 0;
12879                 if (hold_tcblock == 0) {
12880                         SCTP_TCB_LOCK(stcb);
12881                         hold_tcblock = 1;
12882                 }
12883                 cnt = sctp_is_there_unsent_data(stcb);
12884                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12885                     TAILQ_EMPTY(&asoc->sent_queue) &&
12886                     (cnt == 0)) {
12887                         if (asoc->locked_on_sending) {
12888                                 goto abort_anyway;
12889                         }
12890                         /* there is nothing queued to send, so I'm done... */
12891                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12892                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12893                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12894                                 /* only send SHUTDOWN the first time through */
12895                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
12896                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
12897                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
12898                                 }
12899                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
12900                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
12901                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
12902                                     asoc->primary_destination);
12903                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12904                                     asoc->primary_destination);
12905                         }
12906                 } else {
12907                         /*-
12908                          * we still got (or just got) data to send, so set
12909                          * SHUTDOWN_PENDING
12910                          */
12911                         /*-
12912                          * XXX sockets draft says that SCTP_EOF should be
12913                          * sent with no data.  currently, we will allow user
12914                          * data to be sent first and move to
12915                          * SHUTDOWN-PENDING
12916                          */
12917                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12918                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12919                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12920                                 if (hold_tcblock == 0) {
12921                                         SCTP_TCB_LOCK(stcb);
12922                                         hold_tcblock = 1;
12923                                 }
12924                                 if (asoc->locked_on_sending) {
12925                                         /* Locked to send out the data */
12926                                         struct sctp_stream_queue_pending *sp;
12927
12928                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
12929                                         if (sp) {
12930                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
12931                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
12932                                         }
12933                                 }
12934                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
12935                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12936                                     TAILQ_EMPTY(&asoc->sent_queue) &&
12937                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
12938                         abort_anyway:
12939                                         if (free_cnt_applied) {
12940                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
12941                                                 free_cnt_applied = 0;
12942                                         }
12943                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
12944                                             SCTP_RESPONSE_TO_USER_REQ,
12945                                             NULL, SCTP_SO_LOCKED);
12946                                         /*
12947                                          * now relock the stcb so everything
12948                                          * is sane
12949                                          */
12950                                         hold_tcblock = 0;
12951                                         stcb = NULL;
12952                                         goto out;
12953                                 }
12954                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12955                                     asoc->primary_destination);
12956                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
12957                         }
12958                 }
12959         }
12960 skip_out_eof:
12961         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
12962                 some_on_control = 1;
12963         }
12964         if ((net->flight_size > net->cwnd) &&
12965             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12966                 queue_only = 1;
12967         } else if (asoc->ifp_had_enobuf) {
12968                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12969                 if (net->flight_size > (net->mtu * 2)) {
12970                         queue_only = 1;
12971                 } else {
12972                         queue_only = 0;
12973                 }
12974                 asoc->ifp_had_enobuf = 0;
12975                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12976                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12977         } else {
12978                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12979                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12980                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12981                         queue_only = 1;
12982                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12983                 } else if (net->flight_size > net->cwnd) {
12984                         queue_only = 1;
12985                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12986                 } else {
12987                         queue_only = 0;
12988                 }
12989         }
12990         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12991             (stcb->asoc.total_flight > 0) &&
12992             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12993             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12994             ) {
12995                 /*-
12996                  * Ok, Nagle is set on and we have data outstanding.
12997                  * Don't send anything and let SACKs drive out the
12998                  * data unless wen have a "full" segment to send.
12999                  */
13000                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13001                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13002                 }
13003                 SCTP_STAT_INCR(sctps_naglequeued);
13004                 nagle_applies = 1;
13005         } else {
13006                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13007                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13008                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13009                 }
13010                 SCTP_STAT_INCR(sctps_naglesent);
13011                 nagle_applies = 0;
13012         }
13013         if (queue_only_for_init) {
13014                 if (hold_tcblock == 0) {
13015                         SCTP_TCB_LOCK(stcb);
13016                         hold_tcblock = 1;
13017                 }
13018                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13019                         /* a collision took us forward? */
13020                         queue_only_for_init = 0;
13021                         queue_only = 0;
13022                 } else {
13023                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13024                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13025                         queue_only_for_init = 0;
13026                         queue_only = 1;
13027                 }
13028         }
13029         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13030                 /* we can attempt to send too. */
13031                 if (hold_tcblock == 0) {
13032                         /*
13033                          * If there is activity recv'ing sacks no need to
13034                          * send
13035                          */
13036                         if (SCTP_TCB_TRYLOCK(stcb)) {
13037                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13038                                 hold_tcblock = 1;
13039                         }
13040                 } else {
13041                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13042                 }
13043         } else if ((queue_only == 0) &&
13044                     (stcb->asoc.peers_rwnd == 0) &&
13045             (stcb->asoc.total_flight == 0)) {
13046                 /* We get to have a probe outstanding */
13047                 if (hold_tcblock == 0) {
13048                         hold_tcblock = 1;
13049                         SCTP_TCB_LOCK(stcb);
13050                 }
13051                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13052         } else if (some_on_control) {
13053                 int num_out, reason, cwnd_full, frag_point;
13054
13055                 /* Here we do control only */
13056                 if (hold_tcblock == 0) {
13057                         hold_tcblock = 1;
13058                         SCTP_TCB_LOCK(stcb);
13059                 }
13060                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13061                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13062                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13063         }
13064         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d",
13065             queue_only, stcb->asoc.peers_rwnd, un_sent,
13066             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13067             stcb->asoc.total_output_queue_size, error);
13068
13069 out:
13070 out_unlocked:
13071
13072         if (local_soresv && stcb) {
13073                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13074                 local_soresv = 0;
13075         }
13076         if (create_lock_applied) {
13077                 SCTP_ASOC_CREATE_UNLOCK(inp);
13078                 create_lock_applied = 0;
13079         }
13080         if ((stcb) && hold_tcblock) {
13081                 SCTP_TCB_UNLOCK(stcb);
13082         }
13083         if (stcb && free_cnt_applied) {
13084                 atomic_add_int(&stcb->asoc.refcnt, -1);
13085         }
13086 #ifdef INVARIANTS
13087         if (stcb) {
13088                 if (mtx_owned(&stcb->tcb_mtx)) {
13089                         panic("Leaving with tcb mtx owned?");
13090                 }
13091                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13092                         panic("Leaving with tcb send mtx owned?");
13093                 }
13094         }
13095 #endif
13096         if (top) {
13097                 sctp_m_freem(top);
13098         }
13099         if (control) {
13100                 sctp_m_freem(control);
13101         }
13102         return (error);
13103 }
13104
13105
13106 /*
13107  * generate an AUTHentication chunk, if required
13108  */
13109 struct mbuf *
13110 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13111     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13112     struct sctp_tcb *stcb, uint8_t chunk)
13113 {
13114         struct mbuf *m_auth;
13115         struct sctp_auth_chunk *auth;
13116         int chunk_len;
13117
13118         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13119             (stcb == NULL))
13120                 return (m);
13121
13122         /* sysctl disabled auth? */
13123         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13124                 return (m);
13125
13126         /* peer doesn't do auth... */
13127         if (!stcb->asoc.peer_supports_auth) {
13128                 return (m);
13129         }
13130         /* does the requested chunk require auth? */
13131         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13132                 return (m);
13133         }
13134         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13135         if (m_auth == NULL) {
13136                 /* no mbuf's */
13137                 return (m);
13138         }
13139         /* reserve some space if this will be the first mbuf */
13140         if (m == NULL)
13141                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13142         /* fill in the AUTH chunk details */
13143         auth = mtod(m_auth, struct sctp_auth_chunk *);
13144         bzero(auth, sizeof(*auth));
13145         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13146         auth->ch.chunk_flags = 0;
13147         chunk_len = sizeof(*auth) +
13148             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13149         auth->ch.chunk_length = htons(chunk_len);
13150         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13151         /* key id and hmac digest will be computed and filled in upon send */
13152
13153         /* save the offset where the auth was inserted into the chain */
13154         if (m != NULL) {
13155                 struct mbuf *cn;
13156
13157                 *offset = 0;
13158                 cn = m;
13159                 while (cn) {
13160                         *offset += SCTP_BUF_LEN(cn);
13161                         cn = SCTP_BUF_NEXT(cn);
13162                 }
13163         } else
13164                 *offset = 0;
13165
13166         /* update length and return pointer to the auth chunk */
13167         SCTP_BUF_LEN(m_auth) = chunk_len;
13168         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13169         if (auth_ret != NULL)
13170                 *auth_ret = auth;
13171
13172         return (m);
13173 }
13174
13175 #ifdef INET6
13176 int
13177 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13178 {
13179         struct nd_prefix *pfx = NULL;
13180         struct nd_pfxrouter *pfxrtr = NULL;
13181         struct sockaddr_in6 gw6;
13182
13183         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13184                 return (0);
13185
13186         /* get prefix entry of address */
13187         LIST_FOREACH(pfx, &MODULE_GLOBAL(MOD_INET6, nd_prefix), ndpr_entry) {
13188                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13189                         continue;
13190                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13191                     &src6->sin6_addr, &pfx->ndpr_mask))
13192                         break;
13193         }
13194         /* no prefix entry in the prefix list */
13195         if (pfx == NULL) {
13196                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13197                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13198                 return (0);
13199         }
13200         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13201         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13202
13203         /* search installed gateway from prefix entry */
13204         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13205             pfxrtr->pfr_next) {
13206                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13207                 gw6.sin6_family = AF_INET6;
13208                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13209                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13210                     sizeof(struct in6_addr));
13211                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13212                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13213                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13214                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13215                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13216                     ro->ro_rt->rt_gateway)) {
13217                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13218                         return (1);
13219                 }
13220         }
13221         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13222         return (0);
13223 }
13224
13225 #endif
13226
13227 int
13228 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13229 {
13230         struct sockaddr_in *sin, *mask;
13231         struct ifaddr *ifa;
13232         struct in_addr srcnetaddr, gwnetaddr;
13233
13234         if (ro == NULL || ro->ro_rt == NULL ||
13235             sifa->address.sa.sa_family != AF_INET) {
13236                 return (0);
13237         }
13238         ifa = (struct ifaddr *)sifa->ifa;
13239         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13240         sin = (struct sockaddr_in *)&sifa->address.sin;
13241         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13242         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13243         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13244         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13245
13246         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13247         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13248         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13249         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13250         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13251         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13252                 return (1);
13253         }
13254         return (0);
13255 }