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_adaptation_layer_indication *ali;
4100         struct sctp_ecn_supported_param *ecn;
4101         struct sctp_prsctp_supported_param *prsctp;
4102         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4103         struct sctp_supported_chunk_types_param *pr_supported;
4104         int cnt_inits_to = 0;
4105         int padval, ret;
4106         int num_ext;
4107         int p_len;
4108
4109         /* INIT's always go to the primary (and usually ONLY address) */
4110         mp_last = NULL;
4111         net = stcb->asoc.primary_destination;
4112         if (net == NULL) {
4113                 net = TAILQ_FIRST(&stcb->asoc.nets);
4114                 if (net == NULL) {
4115                         /* TSNH */
4116                         return;
4117                 }
4118                 /* we confirm any address we send an INIT to */
4119                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4120                 (void)sctp_set_primary_addr(stcb, NULL, net);
4121         } else {
4122                 /* we confirm any address we send an INIT to */
4123                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4124         }
4125         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4126 #ifdef INET6
4127         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4128                 /*
4129                  * special hook, if we are sending to link local it will not
4130                  * show up in our private address count.
4131                  */
4132                 struct sockaddr_in6 *sin6l;
4133
4134                 sin6l = &net->ro._l_addr.sin6;
4135                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4136                         cnt_inits_to = 1;
4137         }
4138 #endif
4139         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4140                 /* This case should not happen */
4141                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4142                 return;
4143         }
4144         /* start the INIT timer */
4145         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4146
4147         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4148         if (m == NULL) {
4149                 /* No memory, INIT timer will re-attempt. */
4150                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4151                 return;
4152         }
4153         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
4154         /*
4155          * assume peer supports asconf in order to be able to queue local
4156          * address changes while an INIT is in flight and before the assoc
4157          * is established.
4158          */
4159         stcb->asoc.peer_supports_asconf = 1;
4160         /* Now lets put the SCTP header in place */
4161         initm = mtod(m, struct sctp_init_msg *);
4162         initm->sh.src_port = inp->sctp_lport;
4163         initm->sh.dest_port = stcb->rport;
4164         initm->sh.v_tag = 0;
4165         initm->sh.checksum = 0; /* calculate later */
4166         /* now the chunk header */
4167         initm->msg.ch.chunk_type = SCTP_INITIATION;
4168         initm->msg.ch.chunk_flags = 0;
4169         /* fill in later from mbuf we build */
4170         initm->msg.ch.chunk_length = 0;
4171         /* place in my tag */
4172         initm->msg.init.initiate_tag = htonl(stcb->asoc.my_vtag);
4173         /* set up some of the credits. */
4174         initm->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(inp->sctp_socket),
4175             SCTP_MINIMAL_RWND));
4176
4177         initm->msg.init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4178         initm->msg.init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4179         initm->msg.init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4180         /* now the address restriction */
4181         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)initm +
4182             sizeof(*initm));
4183         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4184 #ifdef INET6
4185         /* we support 2 types: IPv6/IPv4 */
4186         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4187         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4188         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4189 #else
4190         /* we support 1 type: IPv4 */
4191         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4192         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4193         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4194 #endif
4195         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4196
4197         /* adaptation layer indication parameter */
4198         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4199         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4200         ali->ph.param_length = htons(sizeof(*ali));
4201         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4202         SCTP_BUF_LEN(m) += sizeof(*ali);
4203         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4204
4205         /* now any cookie time extensions */
4206         if (stcb->asoc.cookie_preserve_req) {
4207                 struct sctp_cookie_perserve_param *cookie_preserve;
4208
4209                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4210                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4211                 cookie_preserve->ph.param_length = htons(
4212                     sizeof(*cookie_preserve));
4213                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4214                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4215                 ecn = (struct sctp_ecn_supported_param *)(
4216                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4217                 stcb->asoc.cookie_preserve_req = 0;
4218         }
4219         /* ECN parameter */
4220         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
4221                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4222                 ecn->ph.param_length = htons(sizeof(*ecn));
4223                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4224                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4225                     sizeof(*ecn));
4226         } else {
4227                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4228         }
4229         /* And now tell the peer we do pr-sctp */
4230         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4231         prsctp->ph.param_length = htons(sizeof(*prsctp));
4232         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4233
4234         /* And now tell the peer we do all the extensions */
4235         pr_supported = (struct sctp_supported_chunk_types_param *)
4236             ((caddr_t)prsctp + sizeof(*prsctp));
4237         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4238         num_ext = 0;
4239         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4240         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4241         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4242         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4243         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4244         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
4245                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4246         p_len = sizeof(*pr_supported) + num_ext;
4247         pr_supported->ph.param_length = htons(p_len);
4248         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4249         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4250
4251         /* ECN nonce: And now tell the peer we support ECN nonce */
4252         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
4253                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
4254                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
4255                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
4256                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
4257                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
4258         }
4259         /* add authentication parameters */
4260         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4261                 struct sctp_auth_random *randp;
4262                 struct sctp_auth_hmac_algo *hmacs;
4263                 struct sctp_auth_chunk_list *chunks;
4264
4265                 /* attach RANDOM parameter, if available */
4266                 if (stcb->asoc.authinfo.random != NULL) {
4267                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4268                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4269 #ifdef SCTP_AUTH_DRAFT_04
4270                         randp->ph.param_type = htons(SCTP_RANDOM);
4271                         randp->ph.param_length = htons(p_len);
4272                         bcopy(stcb->asoc.authinfo.random->key,
4273                             randp->random_data,
4274                             stcb->asoc.authinfo.random_len);
4275 #else
4276                         /* random key already contains the header */
4277                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4278 #endif
4279                         /* zero out any padding required */
4280                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4281                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4282                 }
4283                 /* add HMAC_ALGO parameter */
4284                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4285                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4286                     (uint8_t *) hmacs->hmac_ids);
4287                 if (p_len > 0) {
4288                         p_len += sizeof(*hmacs);
4289                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4290                         hmacs->ph.param_length = htons(p_len);
4291                         /* zero out any padding required */
4292                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4293                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4294                 }
4295                 /* add CHUNKS parameter */
4296                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4297                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4298                     chunks->chunk_types);
4299                 if (p_len > 0) {
4300                         p_len += sizeof(*chunks);
4301                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4302                         chunks->ph.param_length = htons(p_len);
4303                         /* zero out any padding required */
4304                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4305                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4306                 }
4307         }
4308         m_at = m;
4309         /* now the addresses */
4310         {
4311                 struct sctp_scoping scp;
4312
4313                 /*
4314                  * To optimize this we could put the scoping stuff into a
4315                  * structure and remove the individual uint8's from the
4316                  * assoc structure. Then we could just sifa in the address
4317                  * within the stcb.. but for now this is a quick hack to get
4318                  * the address stuff teased apart.
4319                  */
4320                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4321                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4322                 scp.loopback_scope = stcb->asoc.loopback_scope;
4323                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4324                 scp.local_scope = stcb->asoc.local_scope;
4325                 scp.site_scope = stcb->asoc.site_scope;
4326
4327                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4328         }
4329
4330         /* calulate the size and update pkt header and chunk header */
4331         p_len = 0;
4332         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4333                 if (SCTP_BUF_NEXT(m_at) == NULL)
4334                         mp_last = m_at;
4335                 p_len += SCTP_BUF_LEN(m_at);
4336         }
4337         initm->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
4338         /*
4339          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4340          * here since the timer will drive a retranmission.
4341          */
4342
4343         /* I don't expect this to execute but we will be safe here */
4344         padval = p_len % 4;
4345         if ((padval) && (mp_last)) {
4346                 /*
4347                  * The compiler worries that mp_last may not be set even
4348                  * though I think it is impossible :-> however we add
4349                  * mp_last here just in case.
4350                  */
4351                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4352                 if (ret) {
4353                         /* Houston we have a problem, no space */
4354                         sctp_m_freem(m);
4355                         return;
4356                 }
4357                 p_len += padval;
4358         }
4359         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4360         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4361             (struct sockaddr *)&net->ro._l_addr,
4362             m, 0, NULL, 0, 0, NULL, 0, net->port, so_locked, NULL);
4363         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4364         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4365         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4366         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4367 }
4368
4369 struct mbuf *
4370 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4371     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp)
4372 {
4373         /*
4374          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4375          * being equal to the beginning of the params i.e. (iphlen +
4376          * sizeof(struct sctp_init_msg) parse through the parameters to the
4377          * end of the mbuf verifying that all parameters are known.
4378          *
4379          * For unknown parameters build and return a mbuf with
4380          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4381          * processing this chunk stop, and set *abort_processing to 1.
4382          *
4383          * By having param_offset be pre-set to where parameters begin it is
4384          * hoped that this routine may be reused in the future by new
4385          * features.
4386          */
4387         struct sctp_paramhdr *phdr, params;
4388
4389         struct mbuf *mat, *op_err;
4390         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4391         int at, limit, pad_needed;
4392         uint16_t ptype, plen, padded_size;
4393         int err_at;
4394
4395         *abort_processing = 0;
4396         mat = in_initpkt;
4397         err_at = 0;
4398         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4399         at = param_offset;
4400         op_err = NULL;
4401         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4402         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4403         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4404                 ptype = ntohs(phdr->param_type);
4405                 plen = ntohs(phdr->param_length);
4406                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4407                         /* wacked parameter */
4408                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4409                         goto invalid_size;
4410                 }
4411                 limit -= SCTP_SIZE32(plen);
4412                 /*-
4413                  * All parameters for all chunks that we know/understand are
4414                  * listed here. We process them other places and make
4415                  * appropriate stop actions per the upper bits. However this
4416                  * is the generic routine processor's can call to get back
4417                  * an operr.. to either incorporate (init-ack) or send.
4418                  */
4419                 padded_size = SCTP_SIZE32(plen);
4420                 switch (ptype) {
4421                         /* Param's with variable size */
4422                 case SCTP_HEARTBEAT_INFO:
4423                 case SCTP_STATE_COOKIE:
4424                 case SCTP_UNRECOG_PARAM:
4425                 case SCTP_ERROR_CAUSE_IND:
4426                         /* ok skip fwd */
4427                         at += padded_size;
4428                         break;
4429                         /* Param's with variable size within a range */
4430                 case SCTP_CHUNK_LIST:
4431                 case SCTP_SUPPORTED_CHUNK_EXT:
4432                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4433                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4434                                 goto invalid_size;
4435                         }
4436                         at += padded_size;
4437                         break;
4438                 case SCTP_SUPPORTED_ADDRTYPE:
4439                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4440                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4441                                 goto invalid_size;
4442                         }
4443                         at += padded_size;
4444                         break;
4445                 case SCTP_RANDOM:
4446                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4447                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4448                                 goto invalid_size;
4449                         }
4450                         at += padded_size;
4451                         break;
4452                 case SCTP_SET_PRIM_ADDR:
4453                 case SCTP_DEL_IP_ADDRESS:
4454                 case SCTP_ADD_IP_ADDRESS:
4455                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4456                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4457                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4458                                 goto invalid_size;
4459                         }
4460                         at += padded_size;
4461                         break;
4462                         /* Param's with a fixed size */
4463                 case SCTP_IPV4_ADDRESS:
4464                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4465                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4466                                 goto invalid_size;
4467                         }
4468                         at += padded_size;
4469                         break;
4470                 case SCTP_IPV6_ADDRESS:
4471                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4472                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4473                                 goto invalid_size;
4474                         }
4475                         at += padded_size;
4476                         break;
4477                 case SCTP_COOKIE_PRESERVE:
4478                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4479                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4480                                 goto invalid_size;
4481                         }
4482                         at += padded_size;
4483                         break;
4484                 case SCTP_ECN_NONCE_SUPPORTED:
4485                 case SCTP_PRSCTP_SUPPORTED:
4486                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4487                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp %d\n", plen);
4488                                 goto invalid_size;
4489                         }
4490                         at += padded_size;
4491                         break;
4492                 case SCTP_ECN_CAPABLE:
4493                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4494                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4495                                 goto invalid_size;
4496                         }
4497                         at += padded_size;
4498                         break;
4499                 case SCTP_ULP_ADAPTATION:
4500                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4501                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4502                                 goto invalid_size;
4503                         }
4504                         at += padded_size;
4505                         break;
4506                 case SCTP_SUCCESS_REPORT:
4507                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4508                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4509                                 goto invalid_size;
4510                         }
4511                         at += padded_size;
4512                         break;
4513                 case SCTP_HOSTNAME_ADDRESS:
4514                         {
4515                                 /* We can NOT handle HOST NAME addresses!! */
4516                                 int l_len;
4517
4518                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4519                                 *abort_processing = 1;
4520                                 if (op_err == NULL) {
4521                                         /* Ok need to try to get a mbuf */
4522 #ifdef INET6
4523                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4524 #else
4525                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4526 #endif
4527                                         l_len += plen;
4528                                         l_len += sizeof(struct sctp_paramhdr);
4529                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4530                                         if (op_err) {
4531                                                 SCTP_BUF_LEN(op_err) = 0;
4532                                                 /*
4533                                                  * pre-reserve space for ip
4534                                                  * and sctp header  and
4535                                                  * chunk hdr
4536                                                  */
4537 #ifdef INET6
4538                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4539 #else
4540                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4541 #endif
4542                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4543                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4544                                         }
4545                                 }
4546                                 if (op_err) {
4547                                         /* If we have space */
4548                                         struct sctp_paramhdr s;
4549
4550                                         if (err_at % 4) {
4551                                                 uint32_t cpthis = 0;
4552
4553                                                 pad_needed = 4 - (err_at % 4);
4554                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4555                                                 err_at += pad_needed;
4556                                         }
4557                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4558                                         s.param_length = htons(sizeof(s) + plen);
4559                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4560                                         err_at += sizeof(s);
4561                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4562                                         if (phdr == NULL) {
4563                                                 sctp_m_freem(op_err);
4564                                                 /*
4565                                                  * we are out of memory but
4566                                                  * we still need to have a
4567                                                  * look at what to do (the
4568                                                  * system is in trouble
4569                                                  * though).
4570                                                  */
4571                                                 return (NULL);
4572                                         }
4573                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4574                                         err_at += plen;
4575                                 }
4576                                 return (op_err);
4577                                 break;
4578                         }
4579                 default:
4580                         /*
4581                          * we do not recognize the parameter figure out what
4582                          * we do.
4583                          */
4584                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4585                         if ((ptype & 0x4000) == 0x4000) {
4586                                 /* Report bit is set?? */
4587                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4588                                 if (op_err == NULL) {
4589                                         int l_len;
4590
4591                                         /* Ok need to try to get an mbuf */
4592 #ifdef INET6
4593                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4594 #else
4595                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4596 #endif
4597                                         l_len += plen;
4598                                         l_len += sizeof(struct sctp_paramhdr);
4599                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4600                                         if (op_err) {
4601                                                 SCTP_BUF_LEN(op_err) = 0;
4602 #ifdef INET6
4603                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4604 #else
4605                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4606 #endif
4607                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4608                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4609                                         }
4610                                 }
4611                                 if (op_err) {
4612                                         /* If we have space */
4613                                         struct sctp_paramhdr s;
4614
4615                                         if (err_at % 4) {
4616                                                 uint32_t cpthis = 0;
4617
4618                                                 pad_needed = 4 - (err_at % 4);
4619                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4620                                                 err_at += pad_needed;
4621                                         }
4622                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4623                                         s.param_length = htons(sizeof(s) + plen);
4624                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4625                                         err_at += sizeof(s);
4626                                         if (plen > sizeof(tempbuf)) {
4627                                                 plen = sizeof(tempbuf);
4628                                         }
4629                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4630                                         if (phdr == NULL) {
4631                                                 sctp_m_freem(op_err);
4632                                                 /*
4633                                                  * we are out of memory but
4634                                                  * we still need to have a
4635                                                  * look at what to do (the
4636                                                  * system is in trouble
4637                                                  * though).
4638                                                  */
4639                                                 op_err = NULL;
4640                                                 goto more_processing;
4641                                         }
4642                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4643                                         err_at += plen;
4644                                 }
4645                         }
4646         more_processing:
4647                         if ((ptype & 0x8000) == 0x0000) {
4648                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4649                                 return (op_err);
4650                         } else {
4651                                 /* skip this chunk and continue processing */
4652                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4653                                 at += SCTP_SIZE32(plen);
4654                         }
4655                         break;
4656
4657                 }
4658                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4659         }
4660         return (op_err);
4661 invalid_size:
4662         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4663         *abort_processing = 1;
4664         if ((op_err == NULL) && phdr) {
4665                 int l_len;
4666
4667 #ifdef INET6
4668                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4669 #else
4670                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4671 #endif
4672                 l_len += (2 * sizeof(struct sctp_paramhdr));
4673                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4674                 if (op_err) {
4675                         SCTP_BUF_LEN(op_err) = 0;
4676 #ifdef INET6
4677                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4678 #else
4679                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4680 #endif
4681                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4682                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4683                 }
4684         }
4685         if ((op_err) && phdr) {
4686                 struct sctp_paramhdr s;
4687
4688                 if (err_at % 4) {
4689                         uint32_t cpthis = 0;
4690
4691                         pad_needed = 4 - (err_at % 4);
4692                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4693                         err_at += pad_needed;
4694                 }
4695                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4696                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4697                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4698                 err_at += sizeof(s);
4699                 /* Only copy back the p-hdr that caused the issue */
4700                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4701         }
4702         return (op_err);
4703 }
4704
4705 static int
4706 sctp_are_there_new_addresses(struct sctp_association *asoc,
4707     struct mbuf *in_initpkt, int iphlen, int offset)
4708 {
4709         /*
4710          * Given a INIT packet, look through the packet to verify that there
4711          * are NO new addresses. As we go through the parameters add reports
4712          * of any un-understood parameters that require an error.  Also we
4713          * must return (1) to drop the packet if we see a un-understood
4714          * parameter that tells us to drop the chunk.
4715          */
4716         struct sockaddr_in sin4, *sa4;
4717
4718 #ifdef INET6
4719         struct sockaddr_in6 sin6, *sa6;
4720
4721 #endif
4722         struct sockaddr *sa_touse;
4723         struct sockaddr *sa;
4724         struct sctp_paramhdr *phdr, params;
4725         struct ip *iph;
4726
4727 #ifdef INET6
4728         struct ip6_hdr *ip6h;
4729
4730 #endif
4731         struct mbuf *mat;
4732         uint16_t ptype, plen;
4733         int err_at;
4734         uint8_t fnd;
4735         struct sctp_nets *net;
4736
4737         memset(&sin4, 0, sizeof(sin4));
4738 #ifdef INET6
4739         memset(&sin6, 0, sizeof(sin6));
4740 #endif
4741         sin4.sin_family = AF_INET;
4742         sin4.sin_len = sizeof(sin4);
4743 #ifdef INET6
4744         sin6.sin6_family = AF_INET6;
4745         sin6.sin6_len = sizeof(sin6);
4746 #endif
4747         sa_touse = NULL;
4748         /* First what about the src address of the pkt ? */
4749         iph = mtod(in_initpkt, struct ip *);
4750         switch (iph->ip_v) {
4751         case IPVERSION:
4752                 /* source addr is IPv4 */
4753                 sin4.sin_addr = iph->ip_src;
4754                 sa_touse = (struct sockaddr *)&sin4;
4755                 break;
4756 #ifdef INET6
4757         case IPV6_VERSION >> 4:
4758                 /* source addr is IPv6 */
4759                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4760                 sin6.sin6_addr = ip6h->ip6_src;
4761                 sa_touse = (struct sockaddr *)&sin6;
4762                 break;
4763 #endif
4764         default:
4765                 return (1);
4766         }
4767
4768         fnd = 0;
4769         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4770                 sa = (struct sockaddr *)&net->ro._l_addr;
4771                 if (sa->sa_family == sa_touse->sa_family) {
4772                         if (sa->sa_family == AF_INET) {
4773                                 sa4 = (struct sockaddr_in *)sa;
4774                                 if (sa4->sin_addr.s_addr ==
4775                                     sin4.sin_addr.s_addr) {
4776                                         fnd = 1;
4777                                         break;
4778                                 }
4779                         }
4780 #ifdef INET6
4781                         if (sa->sa_family == AF_INET6) {
4782                                 sa6 = (struct sockaddr_in6 *)sa;
4783                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4784                                     &sin6)) {
4785                                         fnd = 1;
4786                                         break;
4787                                 }
4788                         }
4789 #endif
4790                 }
4791         }
4792         if (fnd == 0) {
4793                 /* New address added! no need to look futher. */
4794                 return (1);
4795         }
4796         /* Ok so far lets munge through the rest of the packet */
4797         mat = in_initpkt;
4798         err_at = 0;
4799         sa_touse = NULL;
4800         offset += sizeof(struct sctp_init_chunk);
4801         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4802         while (phdr) {
4803                 ptype = ntohs(phdr->param_type);
4804                 plen = ntohs(phdr->param_length);
4805                 if (ptype == SCTP_IPV4_ADDRESS) {
4806                         struct sctp_ipv4addr_param *p4, p4_buf;
4807
4808                         phdr = sctp_get_next_param(mat, offset,
4809                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4810                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4811                             phdr == NULL) {
4812                                 return (1);
4813                         }
4814                         p4 = (struct sctp_ipv4addr_param *)phdr;
4815                         sin4.sin_addr.s_addr = p4->addr;
4816                         sa_touse = (struct sockaddr *)&sin4;
4817                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4818                         struct sctp_ipv6addr_param *p6, p6_buf;
4819
4820                         phdr = sctp_get_next_param(mat, offset,
4821                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4822                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4823                             phdr == NULL) {
4824                                 return (1);
4825                         }
4826                         p6 = (struct sctp_ipv6addr_param *)phdr;
4827 #ifdef INET6
4828                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4829                             sizeof(p6->addr));
4830 #endif
4831                         sa_touse = (struct sockaddr *)&sin4;
4832                 }
4833                 if (sa_touse) {
4834                         /* ok, sa_touse points to one to check */
4835                         fnd = 0;
4836                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4837                                 sa = (struct sockaddr *)&net->ro._l_addr;
4838                                 if (sa->sa_family != sa_touse->sa_family) {
4839                                         continue;
4840                                 }
4841                                 if (sa->sa_family == AF_INET) {
4842                                         sa4 = (struct sockaddr_in *)sa;
4843                                         if (sa4->sin_addr.s_addr ==
4844                                             sin4.sin_addr.s_addr) {
4845                                                 fnd = 1;
4846                                                 break;
4847                                         }
4848                                 }
4849 #ifdef INET6
4850                                 if (sa->sa_family == AF_INET6) {
4851                                         sa6 = (struct sockaddr_in6 *)sa;
4852                                         if (SCTP6_ARE_ADDR_EQUAL(
4853                                             sa6, &sin6)) {
4854                                                 fnd = 1;
4855                                                 break;
4856                                         }
4857                                 }
4858 #endif
4859                         }
4860                         if (!fnd) {
4861                                 /* New addr added! no need to look further */
4862                                 return (1);
4863                         }
4864                 }
4865                 offset += SCTP_SIZE32(plen);
4866                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4867         }
4868         return (0);
4869 }
4870
4871 /*
4872  * Given a MBUF chain that was sent into us containing an INIT. Build a
4873  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4874  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4875  * message (i.e. the struct sctp_init_msg).
4876  */
4877 void
4878 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4879     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4880     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4881 {
4882         struct sctp_association *asoc;
4883         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4884         struct sctp_init_msg *initackm_out;
4885         struct sctp_adaptation_layer_indication *ali;
4886         struct sctp_ecn_supported_param *ecn;
4887         struct sctp_prsctp_supported_param *prsctp;
4888         struct sctp_ecn_nonce_supported_param *ecn_nonce;
4889         struct sctp_supported_chunk_types_param *pr_supported;
4890         union sctp_sockstore store, store1, *over_addr;
4891         struct sockaddr_in *sin, *to_sin;
4892
4893 #ifdef INET6
4894         struct sockaddr_in6 *sin6, *to_sin6;
4895
4896 #endif
4897         struct ip *iph;
4898
4899 #ifdef INET6
4900         struct ip6_hdr *ip6;
4901
4902 #endif
4903         struct sockaddr *to;
4904         struct sctp_state_cookie stc;
4905         struct sctp_nets *net = NULL;
4906         uint8_t *signature = NULL;
4907         int cnt_inits_to = 0;
4908         uint16_t his_limit, i_want;
4909         int abort_flag, padval;
4910         int num_ext;
4911         int p_len;
4912         struct socket *so;
4913
4914         if (stcb)
4915                 asoc = &stcb->asoc;
4916         else
4917                 asoc = NULL;
4918         mp_last = NULL;
4919         if ((asoc != NULL) &&
4920             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4921             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4922                 /* new addresses, out of here in non-cookie-wait states */
4923                 /*
4924                  * Send a ABORT, we don't add the new address error clause
4925                  * though we even set the T bit and copy in the 0 tag.. this
4926                  * looks no different than if no listener was present.
4927                  */
4928                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
4929                 return;
4930         }
4931         abort_flag = 0;
4932         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4933             (offset + sizeof(struct sctp_init_chunk)),
4934             &abort_flag, (struct sctp_chunkhdr *)init_chk);
4935         if (abort_flag) {
4936 do_a_abort:
4937                 sctp_send_abort(init_pkt, iphlen, sh,
4938                     init_chk->init.initiate_tag, op_err, vrf_id, port);
4939                 return;
4940         }
4941         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4942         if (m == NULL) {
4943                 /* No memory, INIT timer will re-attempt. */
4944                 if (op_err)
4945                         sctp_m_freem(op_err);
4946                 return;
4947         }
4948         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
4949
4950         /* the time I built cookie */
4951         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
4952
4953         /* populate any tie tags */
4954         if (asoc != NULL) {
4955                 /* unlock before tag selections */
4956                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
4957                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
4958                 stc.cookie_life = asoc->cookie_life;
4959                 net = asoc->primary_destination;
4960         } else {
4961                 stc.tie_tag_my_vtag = 0;
4962                 stc.tie_tag_peer_vtag = 0;
4963                 /* life I will award this cookie */
4964                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
4965         }
4966
4967         /* copy in the ports for later check */
4968         stc.myport = sh->dest_port;
4969         stc.peerport = sh->src_port;
4970
4971         /*
4972          * If we wanted to honor cookie life extentions, we would add to
4973          * stc.cookie_life. For now we should NOT honor any extension
4974          */
4975         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
4976         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
4977                 struct inpcb *in_inp;
4978
4979                 /* Its a V6 socket */
4980                 in_inp = (struct inpcb *)inp;
4981                 stc.ipv6_addr_legal = 1;
4982                 /* Now look at the binding flag to see if V4 will be legal */
4983                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
4984                         stc.ipv4_addr_legal = 1;
4985                 } else {
4986                         /* V4 addresses are NOT legal on the association */
4987                         stc.ipv4_addr_legal = 0;
4988                 }
4989         } else {
4990                 /* Its a V4 socket, no - V6 */
4991                 stc.ipv4_addr_legal = 1;
4992                 stc.ipv6_addr_legal = 0;
4993         }
4994
4995 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
4996         stc.ipv4_scope = 1;
4997 #else
4998         stc.ipv4_scope = 0;
4999 #endif
5000         /* now for scope setup */
5001         memset((caddr_t)&store, 0, sizeof(store));
5002         memset((caddr_t)&store1, 0, sizeof(store1));
5003         sin = &store.sin;
5004         to_sin = &store1.sin;
5005 #ifdef INET6
5006         sin6 = &store.sin6;
5007         to_sin6 = &store1.sin6;
5008 #endif
5009         iph = mtod(init_pkt, struct ip *);
5010         /* establish the to_addr's */
5011         switch (iph->ip_v) {
5012         case IPVERSION:
5013                 to_sin->sin_port = sh->dest_port;
5014                 to_sin->sin_family = AF_INET;
5015                 to_sin->sin_len = sizeof(struct sockaddr_in);
5016                 to_sin->sin_addr = iph->ip_dst;
5017                 break;
5018 #ifdef INET6
5019         case IPV6_VERSION >> 4:
5020                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5021                 to_sin6->sin6_addr = ip6->ip6_dst;
5022                 to_sin6->sin6_scope_id = 0;
5023                 to_sin6->sin6_port = sh->dest_port;
5024                 to_sin6->sin6_family = AF_INET6;
5025                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5026                 break;
5027 #endif
5028         default:
5029                 goto do_a_abort;
5030                 break;
5031         };
5032
5033         if (net == NULL) {
5034                 to = (struct sockaddr *)&store;
5035                 switch (iph->ip_v) {
5036                 case IPVERSION:
5037                         {
5038                                 sin->sin_family = AF_INET;
5039                                 sin->sin_len = sizeof(struct sockaddr_in);
5040                                 sin->sin_port = sh->src_port;
5041                                 sin->sin_addr = iph->ip_src;
5042                                 /* lookup address */
5043                                 stc.address[0] = sin->sin_addr.s_addr;
5044                                 stc.address[1] = 0;
5045                                 stc.address[2] = 0;
5046                                 stc.address[3] = 0;
5047                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5048                                 /* local from address */
5049                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5050                                 stc.laddress[1] = 0;
5051                                 stc.laddress[2] = 0;
5052                                 stc.laddress[3] = 0;
5053                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5054                                 /* scope_id is only for v6 */
5055                                 stc.scope_id = 0;
5056 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5057                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5058                                         stc.ipv4_scope = 1;
5059                                 }
5060 #else
5061                                 stc.ipv4_scope = 1;
5062 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5063                                 /* Must use the address in this case */
5064                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5065                                         stc.loopback_scope = 1;
5066                                         stc.ipv4_scope = 1;
5067                                         stc.site_scope = 1;
5068                                         stc.local_scope = 0;
5069                                 }
5070                                 break;
5071                         }
5072 #ifdef INET6
5073                 case IPV6_VERSION >> 4:
5074                         {
5075                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5076                                 sin6->sin6_family = AF_INET6;
5077                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5078                                 sin6->sin6_port = sh->src_port;
5079                                 sin6->sin6_addr = ip6->ip6_src;
5080                                 /* lookup address */
5081                                 memcpy(&stc.address, &sin6->sin6_addr,
5082                                     sizeof(struct in6_addr));
5083                                 sin6->sin6_scope_id = 0;
5084                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5085                                 stc.scope_id = 0;
5086                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5087                                         /*
5088                                          * FIX ME: does this have scope from
5089                                          * rcvif?
5090                                          */
5091                                         (void)sa6_recoverscope(sin6);
5092                                         stc.scope_id = sin6->sin6_scope_id;
5093                                         sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone));
5094                                         stc.loopback_scope = 1;
5095                                         stc.local_scope = 0;
5096                                         stc.site_scope = 1;
5097                                         stc.ipv4_scope = 1;
5098                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5099                                         /*
5100                                          * If the new destination is a
5101                                          * LINK_LOCAL we must have common
5102                                          * both site and local scope. Don't
5103                                          * set local scope though since we
5104                                          * must depend on the source to be
5105                                          * added implicitly. We cannot
5106                                          * assure just because we share one
5107                                          * link that all links are common.
5108                                          */
5109                                         stc.local_scope = 0;
5110                                         stc.site_scope = 1;
5111                                         stc.ipv4_scope = 1;
5112                                         /*
5113                                          * we start counting for the private
5114                                          * address stuff at 1. since the
5115                                          * link local we source from won't
5116                                          * show up in our scoped count.
5117                                          */
5118                                         cnt_inits_to = 1;
5119                                         /*
5120                                          * pull out the scope_id from
5121                                          * incoming pkt
5122                                          */
5123                                         /*
5124                                          * FIX ME: does this have scope from
5125                                          * rcvif?
5126                                          */
5127                                         (void)sa6_recoverscope(sin6);
5128                                         stc.scope_id = sin6->sin6_scope_id;
5129                                         sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone));
5130                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5131                                         /*
5132                                          * If the new destination is
5133                                          * SITE_LOCAL then we must have site
5134                                          * scope in common.
5135                                          */
5136                                         stc.site_scope = 1;
5137                                 }
5138                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5139                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5140                                 break;
5141                         }
5142 #endif
5143                 default:
5144                         /* TSNH */
5145                         goto do_a_abort;
5146                         break;
5147                 }
5148         } else {
5149                 /* set the scope per the existing tcb */
5150
5151 #ifdef INET6
5152                 struct sctp_nets *lnet;
5153
5154 #endif
5155
5156                 stc.loopback_scope = asoc->loopback_scope;
5157                 stc.ipv4_scope = asoc->ipv4_local_scope;
5158                 stc.site_scope = asoc->site_scope;
5159                 stc.local_scope = asoc->local_scope;
5160 #ifdef INET6
5161                 /* Why do we not consider IPv4 LL addresses? */
5162                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5163                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5164                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5165                                         /*
5166                                          * if we have a LL address, start
5167                                          * counting at 1.
5168                                          */
5169                                         cnt_inits_to = 1;
5170                                 }
5171                         }
5172                 }
5173 #endif
5174                 /* use the net pointer */
5175                 to = (struct sockaddr *)&net->ro._l_addr;
5176                 switch (to->sa_family) {
5177                 case AF_INET:
5178                         sin = (struct sockaddr_in *)to;
5179                         stc.address[0] = sin->sin_addr.s_addr;
5180                         stc.address[1] = 0;
5181                         stc.address[2] = 0;
5182                         stc.address[3] = 0;
5183                         stc.addr_type = SCTP_IPV4_ADDRESS;
5184                         if (net->src_addr_selected == 0) {
5185                                 /*
5186                                  * strange case here, the INIT should have
5187                                  * did the selection.
5188                                  */
5189                                 net->ro._s_addr = sctp_source_address_selection(inp,
5190                                     stcb, (sctp_route_t *) & net->ro,
5191                                     net, 0, vrf_id);
5192                                 if (net->ro._s_addr == NULL)
5193                                         return;
5194
5195                                 net->src_addr_selected = 1;
5196
5197                         }
5198                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5199                         stc.laddress[1] = 0;
5200                         stc.laddress[2] = 0;
5201                         stc.laddress[3] = 0;
5202                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5203                         break;
5204 #ifdef INET6
5205                 case AF_INET6:
5206                         sin6 = (struct sockaddr_in6 *)to;
5207                         memcpy(&stc.address, &sin6->sin6_addr,
5208                             sizeof(struct in6_addr));
5209                         stc.addr_type = SCTP_IPV6_ADDRESS;
5210                         if (net->src_addr_selected == 0) {
5211                                 /*
5212                                  * strange case here, the INIT should have
5213                                  * did the selection.
5214                                  */
5215                                 net->ro._s_addr = sctp_source_address_selection(inp,
5216                                     stcb, (sctp_route_t *) & net->ro,
5217                                     net, 0, vrf_id);
5218                                 if (net->ro._s_addr == NULL)
5219                                         return;
5220
5221                                 net->src_addr_selected = 1;
5222                         }
5223                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5224                             sizeof(struct in6_addr));
5225                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5226                         break;
5227 #endif
5228                 }
5229         }
5230         /* Now lets put the SCTP header in place */
5231         initackm_out = mtod(m, struct sctp_init_msg *);
5232         initackm_out->sh.src_port = inp->sctp_lport;
5233         initackm_out->sh.dest_port = sh->src_port;
5234         initackm_out->sh.v_tag = init_chk->init.initiate_tag;
5235         /* Save it off for quick ref */
5236         stc.peers_vtag = init_chk->init.initiate_tag;
5237         initackm_out->sh.checksum = 0;  /* calculate later */
5238         /* who are we */
5239         memcpy(stc.identification, SCTP_VERSION_STRING,
5240             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5241         /* now the chunk header */
5242         initackm_out->msg.ch.chunk_type = SCTP_INITIATION_ACK;
5243         initackm_out->msg.ch.chunk_flags = 0;
5244         /* fill in later from mbuf we build */
5245         initackm_out->msg.ch.chunk_length = 0;
5246         /* place in my tag */
5247         if ((asoc != NULL) &&
5248             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5249             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5250             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5251                 /* re-use the v-tags and init-seq here */
5252                 initackm_out->msg.init.initiate_tag = htonl(asoc->my_vtag);
5253                 initackm_out->msg.init.initial_tsn = htonl(asoc->init_seq_number);
5254         } else {
5255                 uint32_t vtag, itsn;
5256
5257                 if (hold_inp_lock) {
5258                         SCTP_INP_INCR_REF(inp);
5259                         SCTP_INP_RUNLOCK(inp);
5260                 }
5261                 if (asoc) {
5262                         atomic_add_int(&asoc->refcnt, 1);
5263                         SCTP_TCB_UNLOCK(stcb);
5264                         vtag = sctp_select_a_tag(inp, 1);
5265                         initackm_out->msg.init.initiate_tag = htonl(vtag);
5266                         /* get a TSN to use too */
5267                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5268                         initackm_out->msg.init.initial_tsn = htonl(itsn);
5269                         SCTP_TCB_LOCK(stcb);
5270                         atomic_add_int(&asoc->refcnt, -1);
5271                 } else {
5272                         vtag = sctp_select_a_tag(inp, 1);
5273                         initackm_out->msg.init.initiate_tag = htonl(vtag);
5274                         /* get a TSN to use too */
5275                         initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5276                 }
5277                 if (hold_inp_lock) {
5278                         SCTP_INP_RLOCK(inp);
5279                         SCTP_INP_DECR_REF(inp);
5280                 }
5281         }
5282         /* save away my tag to */
5283         stc.my_vtag = initackm_out->msg.init.initiate_tag;
5284
5285         /* set up some of the credits. */
5286         so = inp->sctp_socket;
5287         if (so == NULL) {
5288                 /* memory problem */
5289                 sctp_m_freem(m);
5290                 return;
5291         } else {
5292                 initackm_out->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5293         }
5294         /* set what I want */
5295         his_limit = ntohs(init_chk->init.num_inbound_streams);
5296         /* choose what I want */
5297         if (asoc != NULL) {
5298                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5299                         i_want = asoc->streamoutcnt;
5300                 } else {
5301                         i_want = inp->sctp_ep.pre_open_stream_count;
5302                 }
5303         } else {
5304                 i_want = inp->sctp_ep.pre_open_stream_count;
5305         }
5306         if (his_limit < i_want) {
5307                 /* I Want more :< */
5308                 initackm_out->msg.init.num_outbound_streams = init_chk->init.num_inbound_streams;
5309         } else {
5310                 /* I can have what I want :> */
5311                 initackm_out->msg.init.num_outbound_streams = htons(i_want);
5312         }
5313         /* tell him his limt. */
5314         initackm_out->msg.init.num_inbound_streams =
5315             htons(inp->sctp_ep.max_open_streams_intome);
5316
5317         /* adaptation layer indication parameter */
5318         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initackm_out + sizeof(*initackm_out));
5319         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5320         ali->ph.param_length = htons(sizeof(*ali));
5321         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5322         SCTP_BUF_LEN(m) += sizeof(*ali);
5323         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5324
5325         /* ECN parameter */
5326         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
5327                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5328                 ecn->ph.param_length = htons(sizeof(*ecn));
5329                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5330
5331                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5332                     sizeof(*ecn));
5333         } else {
5334                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5335         }
5336         /* And now tell the peer we do  pr-sctp */
5337         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5338         prsctp->ph.param_length = htons(sizeof(*prsctp));
5339         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5340
5341         /* And now tell the peer we do all the extensions */
5342         pr_supported = (struct sctp_supported_chunk_types_param *)
5343             ((caddr_t)prsctp + sizeof(*prsctp));
5344
5345         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5346         num_ext = 0;
5347         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5348         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5349         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5350         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5351         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5352         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5353                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5354         p_len = sizeof(*pr_supported) + num_ext;
5355         pr_supported->ph.param_length = htons(p_len);
5356         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5357         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5358
5359         /* ECN nonce: And now tell the peer we support ECN nonce */
5360         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
5361                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
5362                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
5363                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
5364                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
5365                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
5366         }
5367         /* add authentication parameters */
5368         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5369                 struct sctp_auth_random *randp;
5370                 struct sctp_auth_hmac_algo *hmacs;
5371                 struct sctp_auth_chunk_list *chunks;
5372                 uint16_t random_len;
5373
5374                 /* generate and add RANDOM parameter */
5375                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5376                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5377                 randp->ph.param_type = htons(SCTP_RANDOM);
5378                 p_len = sizeof(*randp) + random_len;
5379                 randp->ph.param_length = htons(p_len);
5380                 SCTP_READ_RANDOM(randp->random_data, random_len);
5381                 /* zero out any padding required */
5382                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5383                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5384
5385                 /* add HMAC_ALGO parameter */
5386                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5387                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5388                     (uint8_t *) hmacs->hmac_ids);
5389                 if (p_len > 0) {
5390                         p_len += sizeof(*hmacs);
5391                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5392                         hmacs->ph.param_length = htons(p_len);
5393                         /* zero out any padding required */
5394                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5395                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5396                 }
5397                 /* add CHUNKS parameter */
5398                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5399                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5400                     chunks->chunk_types);
5401                 if (p_len > 0) {
5402                         p_len += sizeof(*chunks);
5403                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5404                         chunks->ph.param_length = htons(p_len);
5405                         /* zero out any padding required */
5406                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5407                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5408                 }
5409         }
5410         m_at = m;
5411         /* now the addresses */
5412         {
5413                 struct sctp_scoping scp;
5414
5415                 /*
5416                  * To optimize this we could put the scoping stuff into a
5417                  * structure and remove the individual uint8's from the stc
5418                  * structure. Then we could just sifa in the address within
5419                  * the stc.. but for now this is a quick hack to get the
5420                  * address stuff teased apart.
5421                  */
5422                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5423                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5424                 scp.loopback_scope = stc.loopback_scope;
5425                 scp.ipv4_local_scope = stc.ipv4_scope;
5426                 scp.local_scope = stc.local_scope;
5427                 scp.site_scope = stc.site_scope;
5428                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5429         }
5430
5431         /* tack on the operational error if present */
5432         if (op_err) {
5433                 struct mbuf *ol;
5434                 int llen;
5435
5436                 llen = 0;
5437                 ol = op_err;
5438                 while (ol) {
5439                         llen += SCTP_BUF_LEN(ol);
5440                         ol = SCTP_BUF_NEXT(ol);
5441                 }
5442                 if (llen % 4) {
5443                         /* must add a pad to the param */
5444                         uint32_t cpthis = 0;
5445                         int padlen;
5446
5447                         padlen = 4 - (llen % 4);
5448                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5449                 }
5450                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5451                         m_at = SCTP_BUF_NEXT(m_at);
5452                 }
5453                 SCTP_BUF_NEXT(m_at) = op_err;
5454                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5455                         m_at = SCTP_BUF_NEXT(m_at);
5456                 }
5457         }
5458         /* pre-calulate the size and update pkt header and chunk header */
5459         p_len = 0;
5460         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5461                 p_len += SCTP_BUF_LEN(m_tmp);
5462                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5463                         /* m_tmp should now point to last one */
5464                         break;
5465                 }
5466         }
5467
5468         /* Now we must build a cookie */
5469         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m,
5470             sizeof(struct sctphdr), &stc, &signature);
5471         if (m_cookie == NULL) {
5472                 /* memory problem */
5473                 sctp_m_freem(m);
5474                 return;
5475         }
5476         /* Now append the cookie to the end and update the space/size */
5477         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5478
5479         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5480                 p_len += SCTP_BUF_LEN(m_tmp);
5481                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5482                         /* m_tmp should now point to last one */
5483                         mp_last = m_tmp;
5484                         break;
5485                 }
5486         }
5487         /*
5488          * Place in the size, but we don't include the last pad (if any) in
5489          * the INIT-ACK.
5490          */
5491         initackm_out->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
5492
5493         /*
5494          * Time to sign the cookie, we don't sign over the cookie signature
5495          * though thus we set trailer.
5496          */
5497         (void)sctp_hmac_m(SCTP_HMAC,
5498             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5499             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5500             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5501         /*
5502          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5503          * here since the timer will drive a retranmission.
5504          */
5505         padval = p_len % 4;
5506         if ((padval) && (mp_last)) {
5507                 /* see my previous comments on mp_last */
5508                 int ret;
5509
5510                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5511                 if (ret) {
5512                         /* Houston we have a problem, no space */
5513                         sctp_m_freem(m);
5514                         return;
5515                 }
5516                 p_len += padval;
5517         }
5518         if (stc.loopback_scope) {
5519                 over_addr = &store1;
5520         } else {
5521                 over_addr = NULL;
5522
5523         }
5524
5525         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5526             NULL, 0, port, SCTP_SO_NOT_LOCKED, over_addr);
5527         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5528 }
5529
5530
5531 void
5532 sctp_insert_on_wheel(struct sctp_tcb *stcb,
5533     struct sctp_association *asoc,
5534     struct sctp_stream_out *strq, int holds_lock)
5535 {
5536         struct sctp_stream_out *stre, *strn;
5537
5538         if (holds_lock == 0) {
5539                 SCTP_TCB_SEND_LOCK(stcb);
5540         }
5541         if ((strq->next_spoke.tqe_next) ||
5542             (strq->next_spoke.tqe_prev)) {
5543                 /* already on wheel */
5544                 goto outof_here;
5545         }
5546         stre = TAILQ_FIRST(&asoc->out_wheel);
5547         if (stre == NULL) {
5548                 /* only one on wheel */
5549                 TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
5550                 goto outof_here;
5551         }
5552         for (; stre; stre = strn) {
5553                 strn = TAILQ_NEXT(stre, next_spoke);
5554                 if (stre->stream_no > strq->stream_no) {
5555                         TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
5556                         goto outof_here;
5557                 } else if (stre->stream_no == strq->stream_no) {
5558                         /* huh, should not happen */
5559                         goto outof_here;
5560                 } else if (strn == NULL) {
5561                         /* next one is null */
5562                         TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
5563                             next_spoke);
5564                 }
5565         }
5566 outof_here:
5567         if (holds_lock == 0) {
5568                 SCTP_TCB_SEND_UNLOCK(stcb);
5569         }
5570 }
5571
5572 static void
5573 sctp_remove_from_wheel(struct sctp_tcb *stcb,
5574     struct sctp_association *asoc,
5575     struct sctp_stream_out *strq)
5576 {
5577         /* take off and then setup so we know it is not on the wheel */
5578         SCTP_TCB_SEND_LOCK(stcb);
5579         if (TAILQ_FIRST(&strq->outqueue)) {
5580                 /* more was added */
5581                 SCTP_TCB_SEND_UNLOCK(stcb);
5582                 return;
5583         }
5584         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
5585         strq->next_spoke.tqe_next = NULL;
5586         strq->next_spoke.tqe_prev = NULL;
5587         SCTP_TCB_SEND_UNLOCK(stcb);
5588 }
5589
5590 static void
5591 sctp_prune_prsctp(struct sctp_tcb *stcb,
5592     struct sctp_association *asoc,
5593     struct sctp_sndrcvinfo *srcv,
5594     int dataout)
5595 {
5596         int freed_spc = 0;
5597         struct sctp_tmit_chunk *chk, *nchk;
5598
5599         SCTP_TCB_LOCK_ASSERT(stcb);
5600         if ((asoc->peer_supports_prsctp) &&
5601             (asoc->sent_queue_cnt_removeable > 0)) {
5602                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5603                         /*
5604                          * Look for chunks marked with the PR_SCTP flag AND
5605                          * the buffer space flag. If the one being sent is
5606                          * equal or greater priority then purge the old one
5607                          * and free some space.
5608                          */
5609                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5610                                 /*
5611                                  * This one is PR-SCTP AND buffer space
5612                                  * limited type
5613                                  */
5614                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5615                                         /*
5616                                          * Lower numbers equates to higher
5617                                          * priority so if the one we are
5618                                          * looking at has a larger or equal
5619                                          * priority we want to drop the data
5620                                          * and NOT retransmit it.
5621                                          */
5622                                         if (chk->data) {
5623                                                 /*
5624                                                  * We release the book_size
5625                                                  * if the mbuf is here
5626                                                  */
5627                                                 int ret_spc;
5628                                                 int cause;
5629
5630                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5631                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5632                                                 else
5633                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5634                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5635                                                     cause,
5636                                                     &asoc->sent_queue, SCTP_SO_LOCKED);
5637                                                 freed_spc += ret_spc;
5638                                                 if (freed_spc >= dataout) {
5639                                                         return;
5640                                                 }
5641                                         }       /* if chunk was present */
5642                                 }       /* if of sufficent priority */
5643                         }       /* if chunk has enabled */
5644                 }               /* tailqforeach */
5645
5646                 chk = TAILQ_FIRST(&asoc->send_queue);
5647                 while (chk) {
5648                         nchk = TAILQ_NEXT(chk, sctp_next);
5649                         /* Here we must move to the sent queue and mark */
5650                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
5651                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5652                                         if (chk->data) {
5653                                                 /*
5654                                                  * We release the book_size
5655                                                  * if the mbuf is here
5656                                                  */
5657                                                 int ret_spc;
5658
5659                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5660                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5661                                                     &asoc->send_queue, SCTP_SO_LOCKED);
5662
5663                                                 freed_spc += ret_spc;
5664                                                 if (freed_spc >= dataout) {
5665                                                         return;
5666                                                 }
5667                                         }       /* end if chk->data */
5668                                 }       /* end if right class */
5669                         }       /* end if chk pr-sctp */
5670                         chk = nchk;
5671                 }               /* end while (chk) */
5672         }                       /* if enabled in asoc */
5673 }
5674
5675 int
5676 sctp_get_frag_point(struct sctp_tcb *stcb,
5677     struct sctp_association *asoc)
5678 {
5679         int siz, ovh;
5680
5681         /*
5682          * For endpoints that have both v6 and v4 addresses we must reserve
5683          * room for the ipv6 header, for those that are only dealing with V4
5684          * we use a larger frag point.
5685          */
5686         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5687                 ovh = SCTP_MED_OVERHEAD;
5688         } else {
5689                 ovh = SCTP_MED_V4_OVERHEAD;
5690         }
5691
5692         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5693                 siz = asoc->smallest_mtu - ovh;
5694         else
5695                 siz = (stcb->asoc.sctp_frag_point - ovh);
5696         /*
5697          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5698          */
5699         /* A data chunk MUST fit in a cluster */
5700         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5701         /* } */
5702
5703         /* adjust for an AUTH chunk if DATA requires auth */
5704         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5705                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5706
5707         if (siz % 4) {
5708                 /* make it an even word boundary please */
5709                 siz -= (siz % 4);
5710         }
5711         return (siz);
5712 }
5713
5714 static void
5715 sctp_set_prsctp_policy(struct sctp_tcb *stcb,
5716     struct sctp_stream_queue_pending *sp)
5717 {
5718         sp->pr_sctp_on = 0;
5719         if (stcb->asoc.peer_supports_prsctp) {
5720                 /*
5721                  * We assume that the user wants PR_SCTP_TTL if the user
5722                  * provides a positive lifetime but does not specify any
5723                  * PR_SCTP policy. This is a BAD assumption and causes
5724                  * problems at least with the U-Vancovers MPI folks. I will
5725                  * change this to be no policy means NO PR-SCTP.
5726                  */
5727                 if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5728                         sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5729                         sp->pr_sctp_on = 1;
5730                 } else {
5731                         return;
5732                 }
5733                 switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5734                 case CHUNK_FLAGS_PR_SCTP_BUF:
5735                         /*
5736                          * Time to live is a priority stored in tv_sec when
5737                          * doing the buffer drop thing.
5738                          */
5739                         sp->ts.tv_sec = sp->timetolive;
5740                         sp->ts.tv_usec = 0;
5741                         break;
5742                 case CHUNK_FLAGS_PR_SCTP_TTL:
5743                         {
5744                                 struct timeval tv;
5745
5746                                 (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5747                                 tv.tv_sec = sp->timetolive / 1000;
5748                                 tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5749                                 /*
5750                                  * TODO sctp_constants.h needs alternative
5751                                  * time macros when _KERNEL is undefined.
5752                                  */
5753                                 timevaladd(&sp->ts, &tv);
5754                         }
5755                         break;
5756                 case CHUNK_FLAGS_PR_SCTP_RTX:
5757                         /*
5758                          * Time to live is a the number or retransmissions
5759                          * stored in tv_sec.
5760                          */
5761                         sp->ts.tv_sec = sp->timetolive;
5762                         sp->ts.tv_usec = 0;
5763                         break;
5764                 default:
5765                         SCTPDBG(SCTP_DEBUG_USRREQ1,
5766                             "Unknown PR_SCTP policy %u.\n",
5767                             PR_SCTP_POLICY(sp->sinfo_flags));
5768                         break;
5769                 }
5770         }
5771 }
5772
5773 static int
5774 sctp_msg_append(struct sctp_tcb *stcb,
5775     struct sctp_nets *net,
5776     struct mbuf *m,
5777     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5778 {
5779         int error = 0, holds_lock;
5780         struct mbuf *at;
5781         struct sctp_stream_queue_pending *sp = NULL;
5782         struct sctp_stream_out *strm;
5783
5784         /*
5785          * Given an mbuf chain, put it into the association send queue and
5786          * place it on the wheel
5787          */
5788         holds_lock = hold_stcb_lock;
5789         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5790                 /* Invalid stream number */
5791                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5792                 error = EINVAL;
5793                 goto out_now;
5794         }
5795         if ((stcb->asoc.stream_locked) &&
5796             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5797                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5798                 error = EINVAL;
5799                 goto out_now;
5800         }
5801         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5802         /* Now can we send this? */
5803         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5804             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5805             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5806             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5807                 /* got data while shutting down */
5808                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5809                 error = ECONNRESET;
5810                 goto out_now;
5811         }
5812         sctp_alloc_a_strmoq(stcb, sp);
5813         if (sp == NULL) {
5814                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5815                 error = ENOMEM;
5816                 goto out_now;
5817         }
5818         sp->sinfo_flags = srcv->sinfo_flags;
5819         sp->timetolive = srcv->sinfo_timetolive;
5820         sp->ppid = srcv->sinfo_ppid;
5821         sp->context = srcv->sinfo_context;
5822         sp->strseq = 0;
5823         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5824                 sp->net = net;
5825                 sp->addr_over = 1;
5826         } else {
5827                 sp->net = stcb->asoc.primary_destination;
5828                 sp->addr_over = 0;
5829         }
5830         atomic_add_int(&sp->net->ref_count, 1);
5831         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5832         sp->stream = srcv->sinfo_stream;
5833         sp->msg_is_complete = 1;
5834         sp->sender_all_done = 1;
5835         sp->some_taken = 0;
5836         sp->data = m;
5837         sp->tail_mbuf = NULL;
5838         sp->length = 0;
5839         at = m;
5840         sctp_set_prsctp_policy(stcb, sp);
5841         /*
5842          * We could in theory (for sendall) sifa the length in, but we would
5843          * still have to hunt through the chain since we need to setup the
5844          * tail_mbuf
5845          */
5846         while (at) {
5847                 if (SCTP_BUF_NEXT(at) == NULL)
5848                         sp->tail_mbuf = at;
5849                 sp->length += SCTP_BUF_LEN(at);
5850                 at = SCTP_BUF_NEXT(at);
5851         }
5852         SCTP_TCB_SEND_LOCK(stcb);
5853         sctp_snd_sb_alloc(stcb, sp->length);
5854         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5855         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5856         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5857                 sp->strseq = strm->next_sequence_sent;
5858                 strm->next_sequence_sent++;
5859         }
5860         if ((strm->next_spoke.tqe_next == NULL) &&
5861             (strm->next_spoke.tqe_prev == NULL)) {
5862                 /* Not on wheel, insert */
5863                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
5864         }
5865         m = NULL;
5866         SCTP_TCB_SEND_UNLOCK(stcb);
5867 out_now:
5868         if (m) {
5869                 sctp_m_freem(m);
5870         }
5871         return (error);
5872 }
5873
5874
5875 static struct mbuf *
5876 sctp_copy_mbufchain(struct mbuf *clonechain,
5877     struct mbuf *outchain,
5878     struct mbuf **endofchain,
5879     int can_take_mbuf,
5880     int sizeofcpy,
5881     uint8_t copy_by_ref)
5882 {
5883         struct mbuf *m;
5884         struct mbuf *appendchain;
5885         caddr_t cp;
5886         int len;
5887
5888         if (endofchain == NULL) {
5889                 /* error */
5890 error_out:
5891                 if (outchain)
5892                         sctp_m_freem(outchain);
5893                 return (NULL);
5894         }
5895         if (can_take_mbuf) {
5896                 appendchain = clonechain;
5897         } else {
5898                 if (!copy_by_ref &&
5899                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5900                     ) {
5901                         /* Its not in a cluster */
5902                         if (*endofchain == NULL) {
5903                                 /* lets get a mbuf cluster */
5904                                 if (outchain == NULL) {
5905                                         /* This is the general case */
5906                         new_mbuf:
5907                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5908                                         if (outchain == NULL) {
5909                                                 goto error_out;
5910                                         }
5911                                         SCTP_BUF_LEN(outchain) = 0;
5912                                         *endofchain = outchain;
5913                                         /* get the prepend space */
5914                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5915                                 } else {
5916                                         /*
5917                                          * We really should not get a NULL
5918                                          * in endofchain
5919                                          */
5920                                         /* find end */
5921                                         m = outchain;
5922                                         while (m) {
5923                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5924                                                         *endofchain = m;
5925                                                         break;
5926                                                 }
5927                                                 m = SCTP_BUF_NEXT(m);
5928                                         }
5929                                         /* sanity */
5930                                         if (*endofchain == NULL) {
5931                                                 /*
5932                                                  * huh, TSNH XXX maybe we
5933                                                  * should panic
5934                                                  */
5935                                                 sctp_m_freem(outchain);
5936                                                 goto new_mbuf;
5937                                         }
5938                                 }
5939                                 /* get the new end of length */
5940                                 len = M_TRAILINGSPACE(*endofchain);
5941                         } else {
5942                                 /* how much is left at the end? */
5943                                 len = M_TRAILINGSPACE(*endofchain);
5944                         }
5945                         /* Find the end of the data, for appending */
5946                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5947
5948                         /* Now lets copy it out */
5949                         if (len >= sizeofcpy) {
5950                                 /* It all fits, copy it in */
5951                                 m_copydata(clonechain, 0, sizeofcpy, cp);
5952                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5953                         } else {
5954                                 /* fill up the end of the chain */
5955                                 if (len > 0) {
5956                                         m_copydata(clonechain, 0, len, cp);
5957                                         SCTP_BUF_LEN((*endofchain)) += len;
5958                                         /* now we need another one */
5959                                         sizeofcpy -= len;
5960                                 }
5961                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5962                                 if (m == NULL) {
5963                                         /* We failed */
5964                                         goto error_out;
5965                                 }
5966                                 SCTP_BUF_NEXT((*endofchain)) = m;
5967                                 *endofchain = m;
5968                                 cp = mtod((*endofchain), caddr_t);
5969                                 m_copydata(clonechain, len, sizeofcpy, cp);
5970                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5971                         }
5972                         return (outchain);
5973                 } else {
5974                         /* copy the old fashion way */
5975                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
5976 #ifdef SCTP_MBUF_LOGGING
5977                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5978                                 struct mbuf *mat;
5979
5980                                 mat = appendchain;
5981                                 while (mat) {
5982                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5983                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5984                                         }
5985                                         mat = SCTP_BUF_NEXT(mat);
5986                                 }
5987                         }
5988 #endif
5989                 }
5990         }
5991         if (appendchain == NULL) {
5992                 /* error */
5993                 if (outchain)
5994                         sctp_m_freem(outchain);
5995                 return (NULL);
5996         }
5997         if (outchain) {
5998                 /* tack on to the end */
5999                 if (*endofchain != NULL) {
6000                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6001                 } else {
6002                         m = outchain;
6003                         while (m) {
6004                                 if (SCTP_BUF_NEXT(m) == NULL) {
6005                                         SCTP_BUF_NEXT(m) = appendchain;
6006                                         break;
6007                                 }
6008                                 m = SCTP_BUF_NEXT(m);
6009                         }
6010                 }
6011                 /*
6012                  * save off the end and update the end-chain postion
6013                  */
6014                 m = appendchain;
6015                 while (m) {
6016                         if (SCTP_BUF_NEXT(m) == NULL) {
6017                                 *endofchain = m;
6018                                 break;
6019                         }
6020                         m = SCTP_BUF_NEXT(m);
6021                 }
6022                 return (outchain);
6023         } else {
6024                 /* save off the end and update the end-chain postion */
6025                 m = appendchain;
6026                 while (m) {
6027                         if (SCTP_BUF_NEXT(m) == NULL) {
6028                                 *endofchain = m;
6029                                 break;
6030                         }
6031                         m = SCTP_BUF_NEXT(m);
6032                 }
6033                 return (appendchain);
6034         }
6035 }
6036
6037 int
6038 sctp_med_chunk_output(struct sctp_inpcb *inp,
6039     struct sctp_tcb *stcb,
6040     struct sctp_association *asoc,
6041     int *num_out,
6042     int *reason_code,
6043     int control_only, int *cwnd_full, int from_where,
6044     struct timeval *now, int *now_filled, int frag_point, int so_locked
6045 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6046     SCTP_UNUSED
6047 #endif
6048 );
6049
6050 static void
6051 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6052     uint32_t val)
6053 {
6054         struct sctp_copy_all *ca;
6055         struct mbuf *m;
6056         int ret = 0;
6057         int added_control = 0;
6058         int un_sent, do_chunk_output = 1;
6059         struct sctp_association *asoc;
6060
6061         ca = (struct sctp_copy_all *)ptr;
6062         if (ca->m == NULL) {
6063                 return;
6064         }
6065         if (ca->inp != inp) {
6066                 /* TSNH */
6067                 return;
6068         }
6069         if ((ca->m) && ca->sndlen) {
6070                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6071                 if (m == NULL) {
6072                         /* can't copy so we are done */
6073                         ca->cnt_failed++;
6074                         return;
6075                 }
6076 #ifdef SCTP_MBUF_LOGGING
6077                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6078                         struct mbuf *mat;
6079
6080                         mat = m;
6081                         while (mat) {
6082                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6083                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6084                                 }
6085                                 mat = SCTP_BUF_NEXT(mat);
6086                         }
6087                 }
6088 #endif
6089         } else {
6090                 m = NULL;
6091         }
6092         SCTP_TCB_LOCK_ASSERT(stcb);
6093         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6094                 /* Abort this assoc with m as the user defined reason */
6095                 if (m) {
6096                         struct sctp_paramhdr *ph;
6097
6098                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6099                         if (m) {
6100                                 ph = mtod(m, struct sctp_paramhdr *);
6101                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6102                                 ph->param_length = htons(ca->sndlen);
6103                         }
6104                         /*
6105                          * We add one here to keep the assoc from
6106                          * dis-appearing on us.
6107                          */
6108                         atomic_add_int(&stcb->asoc.refcnt, 1);
6109                         sctp_abort_an_association(inp, stcb,
6110                             SCTP_RESPONSE_TO_USER_REQ,
6111                             m, SCTP_SO_NOT_LOCKED);
6112                         /*
6113                          * sctp_abort_an_association calls sctp_free_asoc()
6114                          * free association will NOT free it since we
6115                          * incremented the refcnt .. we do this to prevent
6116                          * it being freed and things getting tricky since we
6117                          * could end up (from free_asoc) calling inpcb_free
6118                          * which would get a recursive lock call to the
6119                          * iterator lock.. But as a consequence of that the
6120                          * stcb will return to us un-locked.. since
6121                          * free_asoc returns with either no TCB or the TCB
6122                          * unlocked, we must relock.. to unlock in the
6123                          * iterator timer :-0
6124                          */
6125                         SCTP_TCB_LOCK(stcb);
6126                         atomic_add_int(&stcb->asoc.refcnt, -1);
6127                         goto no_chunk_output;
6128                 }
6129         } else {
6130                 if (m) {
6131                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6132                             &ca->sndrcv, 1);
6133                 }
6134                 asoc = &stcb->asoc;
6135                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6136                         /* shutdown this assoc */
6137                         int cnt;
6138
6139                         cnt = sctp_is_there_unsent_data(stcb);
6140
6141                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6142                             TAILQ_EMPTY(&asoc->sent_queue) &&
6143                             (cnt == 0)) {
6144                                 if (asoc->locked_on_sending) {
6145                                         goto abort_anyway;
6146                                 }
6147                                 /*
6148                                  * there is nothing queued to send, so I'm
6149                                  * done...
6150                                  */
6151                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6152                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6153                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6154                                         /*
6155                                          * only send SHUTDOWN the first time
6156                                          * through
6157                                          */
6158                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6159                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6160                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6161                                         }
6162                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6163                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6164                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6165                                             asoc->primary_destination);
6166                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6167                                             asoc->primary_destination);
6168                                         added_control = 1;
6169                                         do_chunk_output = 0;
6170                                 }
6171                         } else {
6172                                 /*
6173                                  * we still got (or just got) data to send,
6174                                  * so set SHUTDOWN_PENDING
6175                                  */
6176                                 /*
6177                                  * XXX sockets draft says that SCTP_EOF
6178                                  * should be sent with no data.  currently,
6179                                  * we will allow user data to be sent first
6180                                  * and move to SHUTDOWN-PENDING
6181                                  */
6182                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6183                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6184                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6185                                         if (asoc->locked_on_sending) {
6186                                                 /*
6187                                                  * Locked to send out the
6188                                                  * data
6189                                                  */
6190                                                 struct sctp_stream_queue_pending *sp;
6191
6192                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6193                                                 if (sp) {
6194                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6195                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6196                                                 }
6197                                         }
6198                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6199                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6200                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6201                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6202                                 abort_anyway:
6203                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6204                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6205                                                     SCTP_RESPONSE_TO_USER_REQ,
6206                                                     NULL, SCTP_SO_NOT_LOCKED);
6207                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6208                                                 goto no_chunk_output;
6209                                         }
6210                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6211                                             asoc->primary_destination);
6212                                 }
6213                         }
6214
6215                 }
6216         }
6217         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6218             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6219
6220         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6221             (stcb->asoc.total_flight > 0) &&
6222             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6223             ) {
6224                 do_chunk_output = 0;
6225         }
6226         if (do_chunk_output)
6227                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6228         else if (added_control) {
6229                 int num_out = 0, reason = 0, cwnd_full = 0, now_filled = 0;
6230                 struct timeval now;
6231                 int frag_point;
6232
6233                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6234                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6235                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6236         }
6237 no_chunk_output:
6238         if (ret) {
6239                 ca->cnt_failed++;
6240         } else {
6241                 ca->cnt_sent++;
6242         }
6243 }
6244
6245 static void
6246 sctp_sendall_completes(void *ptr, uint32_t val)
6247 {
6248         struct sctp_copy_all *ca;
6249
6250         ca = (struct sctp_copy_all *)ptr;
6251         /*
6252          * Do a notify here? Kacheong suggests that the notify be done at
6253          * the send time.. so you would push up a notification if any send
6254          * failed. Don't know if this is feasable since the only failures we
6255          * have is "memory" related and if you cannot get an mbuf to send
6256          * the data you surely can't get an mbuf to send up to notify the
6257          * user you can't send the data :->
6258          */
6259
6260         /* now free everything */
6261         sctp_m_freem(ca->m);
6262         SCTP_FREE(ca, SCTP_M_COPYAL);
6263 }
6264
6265
6266 #define MC_ALIGN(m, len) do {                                           \
6267         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6268 } while (0)
6269
6270
6271
6272 static struct mbuf *
6273 sctp_copy_out_all(struct uio *uio, int len)
6274 {
6275         struct mbuf *ret, *at;
6276         int left, willcpy, cancpy, error;
6277
6278         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6279         if (ret == NULL) {
6280                 /* TSNH */
6281                 return (NULL);
6282         }
6283         left = len;
6284         SCTP_BUF_LEN(ret) = 0;
6285         /* save space for the data chunk header */
6286         cancpy = M_TRAILINGSPACE(ret);
6287         willcpy = min(cancpy, left);
6288         at = ret;
6289         while (left > 0) {
6290                 /* Align data to the end */
6291                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6292                 if (error) {
6293         err_out_now:
6294                         sctp_m_freem(at);
6295                         return (NULL);
6296                 }
6297                 SCTP_BUF_LEN(at) = willcpy;
6298                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6299                 left -= willcpy;
6300                 if (left > 0) {
6301                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6302                         if (SCTP_BUF_NEXT(at) == NULL) {
6303                                 goto err_out_now;
6304                         }
6305                         at = SCTP_BUF_NEXT(at);
6306                         SCTP_BUF_LEN(at) = 0;
6307                         cancpy = M_TRAILINGSPACE(at);
6308                         willcpy = min(cancpy, left);
6309                 }
6310         }
6311         return (ret);
6312 }
6313
6314 static int
6315 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6316     struct sctp_sndrcvinfo *srcv)
6317 {
6318         int ret;
6319         struct sctp_copy_all *ca;
6320
6321         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6322             SCTP_M_COPYAL);
6323         if (ca == NULL) {
6324                 sctp_m_freem(m);
6325                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6326                 return (ENOMEM);
6327         }
6328         memset(ca, 0, sizeof(struct sctp_copy_all));
6329
6330         ca->inp = inp;
6331         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6332         /*
6333          * take off the sendall flag, it would be bad if we failed to do
6334          * this :-0
6335          */
6336         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6337         /* get length and mbuf chain */
6338         if (uio) {
6339                 ca->sndlen = uio->uio_resid;
6340                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6341                 if (ca->m == NULL) {
6342                         SCTP_FREE(ca, SCTP_M_COPYAL);
6343                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6344                         return (ENOMEM);
6345                 }
6346         } else {
6347                 /* Gather the length of the send */
6348                 struct mbuf *mat;
6349
6350                 mat = m;
6351                 ca->sndlen = 0;
6352                 while (m) {
6353                         ca->sndlen += SCTP_BUF_LEN(m);
6354                         m = SCTP_BUF_NEXT(m);
6355                 }
6356                 ca->m = mat;
6357         }
6358         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6359             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6360             SCTP_ASOC_ANY_STATE,
6361             (void *)ca, 0,
6362             sctp_sendall_completes, inp, 1);
6363         if (ret) {
6364                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6365                 SCTP_FREE(ca, SCTP_M_COPYAL);
6366                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6367                 return (EFAULT);
6368         }
6369         return (0);
6370 }
6371
6372
6373 void
6374 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6375 {
6376         struct sctp_tmit_chunk *chk, *nchk;
6377
6378         chk = TAILQ_FIRST(&asoc->control_send_queue);
6379         while (chk) {
6380                 nchk = TAILQ_NEXT(chk, sctp_next);
6381                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6382                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6383                         if (chk->data) {
6384                                 sctp_m_freem(chk->data);
6385                                 chk->data = NULL;
6386                         }
6387                         asoc->ctrl_queue_cnt--;
6388                         sctp_free_a_chunk(stcb, chk);
6389                 }
6390                 chk = nchk;
6391         }
6392 }
6393
6394 void
6395 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6396 {
6397         struct sctp_association *asoc;
6398         struct sctp_tmit_chunk *chk, *chk_tmp;
6399         struct sctp_asconf_chunk *acp;
6400
6401         asoc = &stcb->asoc;
6402         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
6403             chk = chk_tmp) {
6404                 /* get next chk */
6405                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
6406                 /* find SCTP_ASCONF chunk in queue */
6407                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6408                         if (chk->data) {
6409                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6410                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
6411                                         /* Not Acked yet */
6412                                         break;
6413                                 }
6414                         }
6415                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6416                         if (chk->data) {
6417                                 sctp_m_freem(chk->data);
6418                                 chk->data = NULL;
6419                         }
6420                         asoc->ctrl_queue_cnt--;
6421                         sctp_free_a_chunk(stcb, chk);
6422                 }
6423         }
6424 }
6425
6426
6427 static void
6428 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6429
6430     struct sctp_association *asoc,
6431     struct sctp_tmit_chunk **data_list,
6432     int bundle_at,
6433     struct sctp_nets *net)
6434 {
6435         int i;
6436         struct sctp_tmit_chunk *tp1;
6437
6438         for (i = 0; i < bundle_at; i++) {
6439                 /* off of the send queue */
6440                 if (i) {
6441                         /*
6442                          * Any chunk NOT 0 you zap the time chunk 0 gets
6443                          * zapped or set based on if a RTO measurment is
6444                          * needed.
6445                          */
6446                         data_list[i]->do_rtt = 0;
6447                 }
6448                 /* record time */
6449                 data_list[i]->sent_rcv_time = net->last_sent_time;
6450                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6451                 TAILQ_REMOVE(&asoc->send_queue,
6452                     data_list[i],
6453                     sctp_next);
6454                 /* on to the sent queue */
6455                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6456                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
6457                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
6458                         struct sctp_tmit_chunk *tpp;
6459
6460                         /* need to move back */
6461         back_up_more:
6462                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6463                         if (tpp == NULL) {
6464                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6465                                 goto all_done;
6466                         }
6467                         tp1 = tpp;
6468                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
6469                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
6470                                 goto back_up_more;
6471                         }
6472                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6473                 } else {
6474                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6475                             data_list[i],
6476                             sctp_next);
6477                 }
6478 all_done:
6479                 /* This does not lower until the cum-ack passes it */
6480                 asoc->sent_queue_cnt++;
6481                 asoc->send_queue_cnt--;
6482                 if ((asoc->peers_rwnd <= 0) &&
6483                     (asoc->total_flight == 0) &&
6484                     (bundle_at == 1)) {
6485                         /* Mark the chunk as being a window probe */
6486                         SCTP_STAT_INCR(sctps_windowprobed);
6487                 }
6488 #ifdef SCTP_AUDITING_ENABLED
6489                 sctp_audit_log(0xC2, 3);
6490 #endif
6491                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6492                 data_list[i]->snd_count = 1;
6493                 data_list[i]->rec.data.chunk_was_revoked = 0;
6494                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6495                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6496                             data_list[i]->whoTo->flight_size,
6497                             data_list[i]->book_size,
6498                             (uintptr_t) data_list[i]->whoTo,
6499                             data_list[i]->rec.data.TSN_seq);
6500                 }
6501                 sctp_flight_size_increase(data_list[i]);
6502                 sctp_total_flight_increase(stcb, data_list[i]);
6503                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6504                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6505                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6506                 }
6507                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6508                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6509                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6510                         /* SWS sender side engages */
6511                         asoc->peers_rwnd = 0;
6512                 }
6513         }
6514 }
6515
6516 static void
6517 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6518 {
6519         struct sctp_tmit_chunk *chk, *nchk;
6520
6521         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
6522             chk; chk = nchk) {
6523                 nchk = TAILQ_NEXT(chk, sctp_next);
6524                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6525                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6526                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6527                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6528                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6529                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6530                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6531                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6532                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6533                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6534                         /* Stray chunks must be cleaned up */
6535         clean_up_anyway:
6536                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6537                         if (chk->data) {
6538                                 sctp_m_freem(chk->data);
6539                                 chk->data = NULL;
6540                         }
6541                         asoc->ctrl_queue_cnt--;
6542                         sctp_free_a_chunk(stcb, chk);
6543                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6544                         /* special handling, we must look into the param */
6545                         if (chk != asoc->str_reset) {
6546                                 goto clean_up_anyway;
6547                         }
6548                 }
6549         }
6550 }
6551
6552
6553 static int
6554 sctp_can_we_split_this(struct sctp_tcb *stcb,
6555     uint32_t length,
6556     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6557 {
6558         /*
6559          * Make a decision on if I should split a msg into multiple parts.
6560          * This is only asked of incomplete messages.
6561          */
6562         if (eeor_on) {
6563                 /*
6564                  * If we are doing EEOR we need to always send it if its the
6565                  * entire thing, since it might be all the guy is putting in
6566                  * the hopper.
6567                  */
6568                 if (goal_mtu >= length) {
6569                         /*-
6570                          * If we have data outstanding,
6571                          * we get another chance when the sack
6572                          * arrives to transmit - wait for more data
6573                          */
6574                         if (stcb->asoc.total_flight == 0) {
6575                                 /*
6576                                  * If nothing is in flight, we zero the
6577                                  * packet counter.
6578                                  */
6579                                 return (length);
6580                         }
6581                         return (0);
6582
6583                 } else {
6584                         /* You can fill the rest */
6585                         return (goal_mtu);
6586                 }
6587         }
6588         /*-
6589          * For those strange folk that make the send buffer
6590          * smaller than our fragmentation point, we can't
6591          * get a full msg in so we have to allow splitting.
6592          */
6593         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6594                 return (length);
6595         }
6596         if ((length <= goal_mtu) ||
6597             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6598                 /* Sub-optimial residual don't split in non-eeor mode. */
6599                 return (0);
6600         }
6601         /*
6602          * If we reach here length is larger than the goal_mtu. Do we wish
6603          * to split it for the sake of packet putting together?
6604          */
6605         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6606                 /* Its ok to split it */
6607                 return (min(goal_mtu, frag_point));
6608         }
6609         /* Nope, can't split */
6610         return (0);
6611
6612 }
6613
6614 static uint32_t
6615 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
6616     struct sctp_stream_out *strq,
6617     uint32_t goal_mtu,
6618     uint32_t frag_point,
6619     int *locked,
6620     int *giveup,
6621     int eeor_mode,
6622     int *bail)
6623 {
6624         /* Move from the stream to the send_queue keeping track of the total */
6625         struct sctp_association *asoc;
6626         struct sctp_stream_queue_pending *sp;
6627         struct sctp_tmit_chunk *chk;
6628         struct sctp_data_chunk *dchkh;
6629         uint32_t to_move, length;
6630         uint8_t rcv_flags = 0;
6631         uint8_t some_taken;
6632         uint8_t send_lock_up = 0;
6633
6634         SCTP_TCB_LOCK_ASSERT(stcb);
6635         asoc = &stcb->asoc;
6636 one_more_time:
6637         /* sa_ignore FREED_MEMORY */
6638         sp = TAILQ_FIRST(&strq->outqueue);
6639         if (sp == NULL) {
6640                 *locked = 0;
6641                 if (send_lock_up == 0) {
6642                         SCTP_TCB_SEND_LOCK(stcb);
6643                         send_lock_up = 1;
6644                 }
6645                 sp = TAILQ_FIRST(&strq->outqueue);
6646                 if (sp) {
6647                         goto one_more_time;
6648                 }
6649                 if (strq->last_msg_incomplete) {
6650                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6651                             strq->stream_no,
6652                             strq->last_msg_incomplete);
6653                         strq->last_msg_incomplete = 0;
6654                 }
6655                 to_move = 0;
6656                 if (send_lock_up) {
6657                         SCTP_TCB_SEND_UNLOCK(stcb);
6658                         send_lock_up = 0;
6659                 }
6660                 goto out_of;
6661         }
6662         if ((sp->msg_is_complete) && (sp->length == 0)) {
6663                 if (sp->sender_all_done) {
6664                         /*
6665                          * We are doing differed cleanup. Last time through
6666                          * when we took all the data the sender_all_done was
6667                          * not set.
6668                          */
6669                         if (sp->put_last_out == 0) {
6670                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6671                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6672                                     sp->sender_all_done,
6673                                     sp->length,
6674                                     sp->msg_is_complete,
6675                                     sp->put_last_out,
6676                                     send_lock_up);
6677                         }
6678                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6679                                 SCTP_TCB_SEND_LOCK(stcb);
6680                                 send_lock_up = 1;
6681                         }
6682                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6683                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6684                         sctp_free_remote_addr(sp->net);
6685                         if (sp->data) {
6686                                 sctp_m_freem(sp->data);
6687                                 sp->data = NULL;
6688                         }
6689                         sctp_free_a_strmoq(stcb, sp);
6690
6691                         /* we can't be locked to it */
6692                         *locked = 0;
6693                         stcb->asoc.locked_on_sending = NULL;
6694                         if (send_lock_up) {
6695                                 SCTP_TCB_SEND_UNLOCK(stcb);
6696                                 send_lock_up = 0;
6697                         }
6698                         /* back to get the next msg */
6699                         goto one_more_time;
6700                 } else {
6701                         /*
6702                          * sender just finished this but still holds a
6703                          * reference
6704                          */
6705                         *locked = 1;
6706                         *giveup = 1;
6707                         to_move = 0;
6708                         goto out_of;
6709                 }
6710         } else {
6711                 /* is there some to get */
6712                 if (sp->length == 0) {
6713                         /* no */
6714                         *locked = 1;
6715                         *giveup = 1;
6716                         to_move = 0;
6717                         goto out_of;
6718                 }
6719         }
6720         some_taken = sp->some_taken;
6721         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6722                 sp->msg_is_complete = 1;
6723         }
6724 re_look:
6725         length = sp->length;
6726         if (sp->msg_is_complete) {
6727                 /* The message is complete */
6728                 to_move = min(length, frag_point);
6729                 if (to_move == length) {
6730                         /* All of it fits in the MTU */
6731                         if (sp->some_taken) {
6732                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6733                                 sp->put_last_out = 1;
6734                         } else {
6735                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6736                                 sp->put_last_out = 1;
6737                         }
6738                 } else {
6739                         /* Not all of it fits, we fragment */
6740                         if (sp->some_taken == 0) {
6741                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6742                         }
6743                         sp->some_taken = 1;
6744                 }
6745         } else {
6746                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu,
6747                     frag_point, eeor_mode);
6748                 if (to_move) {
6749                         /*-
6750                          * We use a snapshot of length in case it
6751                          * is expanding during the compare.
6752                          */
6753                         uint32_t llen;
6754
6755                         llen = length;
6756                         if (to_move >= llen) {
6757                                 to_move = llen;
6758                                 if (send_lock_up == 0) {
6759                                         /*-
6760                                          * We are taking all of an incomplete msg
6761                                          * thus we need a send lock.
6762                                          */
6763                                         SCTP_TCB_SEND_LOCK(stcb);
6764                                         send_lock_up = 1;
6765                                         if (sp->msg_is_complete) {
6766                                                 /*
6767                                                  * the sender finished the
6768                                                  * msg
6769                                                  */
6770                                                 goto re_look;
6771                                         }
6772                                 }
6773                         }
6774                         if (sp->some_taken == 0) {
6775                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6776                                 sp->some_taken = 1;
6777                         }
6778                 } else {
6779                         /* Nothing to take. */
6780                         if (sp->some_taken) {
6781                                 *locked = 1;
6782                         }
6783                         *giveup = 1;
6784                         to_move = 0;
6785                         goto out_of;
6786                 }
6787         }
6788
6789         /* If we reach here, we can copy out a chunk */
6790         sctp_alloc_a_chunk(stcb, chk);
6791         if (chk == NULL) {
6792                 /* No chunk memory */
6793                 *giveup = 1;
6794                 to_move = 0;
6795                 goto out_of;
6796         }
6797         /*
6798          * Setup for unordered if needed by looking at the user sent info
6799          * flags.
6800          */
6801         if (sp->sinfo_flags & SCTP_UNORDERED) {
6802                 rcv_flags |= SCTP_DATA_UNORDERED;
6803         }
6804         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) {
6805                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6806         }
6807         /* clear out the chunk before setting up */
6808         memset(chk, 0, sizeof(*chk));
6809         chk->rec.data.rcv_flags = rcv_flags;
6810
6811         if (to_move >= length) {
6812                 /* we think we can steal the whole thing */
6813                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6814                         SCTP_TCB_SEND_LOCK(stcb);
6815                         send_lock_up = 1;
6816                 }
6817                 if (to_move < sp->length) {
6818                         /* bail, it changed */
6819                         goto dont_do_it;
6820                 }
6821                 chk->data = sp->data;
6822                 chk->last_mbuf = sp->tail_mbuf;
6823                 /* register the stealing */
6824                 sp->data = sp->tail_mbuf = NULL;
6825         } else {
6826                 struct mbuf *m;
6827
6828 dont_do_it:
6829                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6830                 chk->last_mbuf = NULL;
6831                 if (chk->data == NULL) {
6832                         sp->some_taken = some_taken;
6833                         sctp_free_a_chunk(stcb, chk);
6834                         *bail = 1;
6835                         to_move = 0;
6836                         goto out_of;
6837                 }
6838 #ifdef SCTP_MBUF_LOGGING
6839                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6840                         struct mbuf *mat;
6841
6842                         mat = chk->data;
6843                         while (mat) {
6844                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6845                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6846                                 }
6847                                 mat = SCTP_BUF_NEXT(mat);
6848                         }
6849                 }
6850 #endif
6851                 /* Pull off the data */
6852                 m_adj(sp->data, to_move);
6853                 /* Now lets work our way down and compact it */
6854                 m = sp->data;
6855                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6856                         sp->data = SCTP_BUF_NEXT(m);
6857                         SCTP_BUF_NEXT(m) = NULL;
6858                         if (sp->tail_mbuf == m) {
6859                                 /*-
6860                                  * Freeing tail? TSNH since
6861                                  * we supposedly were taking less
6862                                  * than the sp->length.
6863                                  */
6864 #ifdef INVARIANTS
6865                                 panic("Huh, freing tail? - TSNH");
6866 #else
6867                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6868                                 sp->tail_mbuf = sp->data = NULL;
6869                                 sp->length = 0;
6870 #endif
6871
6872                         }
6873                         sctp_m_free(m);
6874                         m = sp->data;
6875                 }
6876         }
6877         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6878                 chk->copy_by_ref = 1;
6879         } else {
6880                 chk->copy_by_ref = 0;
6881         }
6882         /*
6883          * get last_mbuf and counts of mb useage This is ugly but hopefully
6884          * its only one mbuf.
6885          */
6886         if (chk->last_mbuf == NULL) {
6887                 chk->last_mbuf = chk->data;
6888                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6889                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6890                 }
6891         }
6892         if (to_move > length) {
6893                 /*- This should not happen either
6894                  * since we always lower to_move to the size
6895                  * of sp->length if its larger.
6896                  */
6897 #ifdef INVARIANTS
6898                 panic("Huh, how can to_move be larger?");
6899 #else
6900                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6901                 sp->length = 0;
6902 #endif
6903         } else {
6904                 atomic_subtract_int(&sp->length, to_move);
6905         }
6906         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6907                 /* Not enough room for a chunk header, get some */
6908                 struct mbuf *m;
6909
6910                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6911                 if (m == NULL) {
6912                         /*
6913                          * we're in trouble here. _PREPEND below will free
6914                          * all the data if there is no leading space, so we
6915                          * must put the data back and restore.
6916                          */
6917                         if (send_lock_up == 0) {
6918                                 SCTP_TCB_SEND_LOCK(stcb);
6919                                 send_lock_up = 1;
6920                         }
6921                         if (chk->data == NULL) {
6922                                 /* unsteal the data */
6923                                 sp->data = chk->data;
6924                                 sp->tail_mbuf = chk->last_mbuf;
6925                         } else {
6926                                 struct mbuf *m_tmp;
6927
6928                                 /* reassemble the data */
6929                                 m_tmp = sp->data;
6930                                 sp->data = chk->data;
6931                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
6932                         }
6933                         sp->some_taken = some_taken;
6934                         atomic_add_int(&sp->length, to_move);
6935                         chk->data = NULL;
6936                         *bail = 1;
6937                         sctp_free_a_chunk(stcb, chk);
6938                         to_move = 0;
6939                         goto out_of;
6940                 } else {
6941                         SCTP_BUF_LEN(m) = 0;
6942                         SCTP_BUF_NEXT(m) = chk->data;
6943                         chk->data = m;
6944                         M_ALIGN(chk->data, 4);
6945                 }
6946         }
6947         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
6948         if (chk->data == NULL) {
6949                 /* HELP, TSNH since we assured it would not above? */
6950 #ifdef INVARIANTS
6951                 panic("prepend failes HELP?");
6952 #else
6953                 SCTP_PRINTF("prepend fails HELP?\n");
6954                 sctp_free_a_chunk(stcb, chk);
6955 #endif
6956                 *bail = 1;
6957                 to_move = 0;
6958                 goto out_of;
6959         }
6960         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
6961         chk->book_size = chk->send_size = (to_move +
6962             sizeof(struct sctp_data_chunk));
6963         chk->book_size_scale = 0;
6964         chk->sent = SCTP_DATAGRAM_UNSENT;
6965
6966         chk->flags = 0;
6967         chk->asoc = &stcb->asoc;
6968         chk->pad_inplace = 0;
6969         chk->no_fr_allowed = 0;
6970         chk->rec.data.stream_seq = sp->strseq;
6971         chk->rec.data.stream_number = sp->stream;
6972         chk->rec.data.payloadtype = sp->ppid;
6973         chk->rec.data.context = sp->context;
6974         chk->rec.data.doing_fast_retransmit = 0;
6975         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
6976
6977         chk->rec.data.timetodrop = sp->ts;
6978         chk->flags = sp->act_flags;
6979         chk->addr_over = sp->addr_over;
6980
6981         chk->whoTo = net;
6982         atomic_add_int(&chk->whoTo->ref_count, 1);
6983
6984         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
6985         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
6986                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
6987                     (uintptr_t) stcb, sp->length,
6988                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
6989                     chk->rec.data.TSN_seq);
6990         }
6991         dchkh = mtod(chk->data, struct sctp_data_chunk *);
6992         /*
6993          * Put the rest of the things in place now. Size was done earlier in
6994          * previous loop prior to padding.
6995          */
6996
6997 #ifdef SCTP_ASOCLOG_OF_TSNS
6998         SCTP_TCB_LOCK_ASSERT(stcb);
6999         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7000                 asoc->tsn_out_at = 0;
7001                 asoc->tsn_out_wrapped = 1;
7002         }
7003         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7004         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7005         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7006         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7007         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7008         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7009         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7010         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7011         asoc->tsn_out_at++;
7012 #endif
7013
7014         dchkh->ch.chunk_type = SCTP_DATA;
7015         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7016         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7017         dchkh->dp.stream_id = htons(strq->stream_no);
7018         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7019         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7020         dchkh->ch.chunk_length = htons(chk->send_size);
7021         /* Now advance the chk->send_size by the actual pad needed. */
7022         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7023                 /* need a pad */
7024                 struct mbuf *lm;
7025                 int pads;
7026
7027                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7028                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7029                         chk->pad_inplace = 1;
7030                 }
7031                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7032                         /* pad added an mbuf */
7033                         chk->last_mbuf = lm;
7034                 }
7035                 chk->send_size += pads;
7036         }
7037         /* We only re-set the policy if it is on */
7038         if (sp->pr_sctp_on) {
7039                 sctp_set_prsctp_policy(stcb, sp);
7040                 asoc->pr_sctp_cnt++;
7041                 chk->pr_sctp_on = 1;
7042         } else {
7043                 chk->pr_sctp_on = 0;
7044         }
7045         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7046                 /* All done pull and kill the message */
7047                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7048                 if (sp->put_last_out == 0) {
7049                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7050                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7051                             sp->sender_all_done,
7052                             sp->length,
7053                             sp->msg_is_complete,
7054                             sp->put_last_out,
7055                             send_lock_up);
7056                 }
7057                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7058                         SCTP_TCB_SEND_LOCK(stcb);
7059                         send_lock_up = 1;
7060                 }
7061                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7062                 sctp_free_remote_addr(sp->net);
7063                 if (sp->data) {
7064                         sctp_m_freem(sp->data);
7065                         sp->data = NULL;
7066                 }
7067                 sctp_free_a_strmoq(stcb, sp);
7068
7069                 /* we can't be locked to it */
7070                 *locked = 0;
7071                 stcb->asoc.locked_on_sending = NULL;
7072         } else {
7073                 /* more to go, we are locked */
7074                 *locked = 1;
7075         }
7076         asoc->chunks_on_out_queue++;
7077         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7078         asoc->send_queue_cnt++;
7079 out_of:
7080         if (send_lock_up) {
7081                 SCTP_TCB_SEND_UNLOCK(stcb);
7082                 send_lock_up = 0;
7083         }
7084         return (to_move);
7085 }
7086
7087
7088 static struct sctp_stream_out *
7089 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
7090 {
7091         struct sctp_stream_out *strq;
7092
7093         /* Find the next stream to use */
7094         if (asoc->last_out_stream == NULL) {
7095                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
7096                 if (asoc->last_out_stream == NULL) {
7097                         /* huh nothing on the wheel, TSNH */
7098                         return (NULL);
7099                 }
7100                 goto done_it;
7101         }
7102         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7103 done_it:
7104         if (strq == NULL) {
7105                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
7106         }
7107         /* Save off the last stream */
7108         asoc->last_out_stream = strq;
7109         return (strq);
7110
7111 }
7112
7113
7114 static void
7115 sctp_fill_outqueue(struct sctp_tcb *stcb,
7116     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7117 {
7118         struct sctp_association *asoc;
7119         struct sctp_stream_out *strq, *strqn, *strqt;
7120         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7121         int locked, giveup;
7122         struct sctp_stream_queue_pending *sp;
7123
7124         SCTP_TCB_LOCK_ASSERT(stcb);
7125         asoc = &stcb->asoc;
7126 #ifdef INET6
7127         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7128                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7129         } else {
7130                 /* ?? not sure what else to do */
7131                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7132         }
7133 #else
7134         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7135 #endif
7136         /* Need an allowance for the data chunk header too */
7137         goal_mtu -= sizeof(struct sctp_data_chunk);
7138
7139         /* must make even word boundary */
7140         goal_mtu &= 0xfffffffc;
7141         if (asoc->locked_on_sending) {
7142                 /* We are stuck on one stream until the message completes. */
7143                 strqn = strq = asoc->locked_on_sending;
7144                 locked = 1;
7145         } else {
7146                 strqn = strq = sctp_select_a_stream(stcb, asoc);
7147                 locked = 0;
7148         }
7149
7150         while ((goal_mtu > 0) && strq) {
7151                 sp = TAILQ_FIRST(&strq->outqueue);
7152                 /*
7153                  * If CMT is off, we must validate that the stream in
7154                  * question has the first item pointed towards are network
7155                  * destionation requested by the caller. Note that if we
7156                  * turn out to be locked to a stream (assigning TSN's then
7157                  * we must stop, since we cannot look for another stream
7158                  * with data to send to that destination). In CMT's case, by
7159                  * skipping this check, we will send one data packet towards
7160                  * the requested net.
7161                  */
7162                 if (sp == NULL) {
7163                         break;
7164                 }
7165                 if ((sp->net != net) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
7166                         /* none for this network */
7167                         if (locked) {
7168                                 break;
7169                         } else {
7170                                 strq = sctp_select_a_stream(stcb, asoc);
7171                                 if (strq == NULL)
7172                                         /* none left */
7173                                         break;
7174                                 if (strqn == strq) {
7175                                         /* I have circled */
7176                                         break;
7177                                 }
7178                                 continue;
7179                         }
7180                 }
7181                 giveup = 0;
7182                 bail = 0;
7183                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
7184                     &giveup, eeor_mode, &bail);
7185                 asoc->last_out_stream = strq;
7186                 if (locked) {
7187                         asoc->locked_on_sending = strq;
7188                         if ((moved_how_much == 0) || (giveup) || bail)
7189                                 /* no more to move for now */
7190                                 break;
7191                 } else {
7192                         asoc->locked_on_sending = NULL;
7193                         strqt = sctp_select_a_stream(stcb, asoc);
7194                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
7195                                 if (strq == strqn) {
7196                                         /* Must move start to next one */
7197                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
7198                                         if (strqn == NULL) {
7199                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
7200                                                 if (strqn == NULL) {
7201                                                         break;
7202                                                 }
7203                                         }
7204                                 }
7205                                 sctp_remove_from_wheel(stcb, asoc, strq);
7206                         }
7207                         if ((giveup) || bail) {
7208                                 break;
7209                         }
7210                         strq = strqt;
7211                         if (strq == NULL) {
7212                                 break;
7213                         }
7214                 }
7215                 total_moved += moved_how_much;
7216                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7217                 goal_mtu &= 0xfffffffc;
7218         }
7219         if (bail)
7220                 *quit_now = 1;
7221
7222         if (total_moved == 0) {
7223                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) &&
7224                     (net == stcb->asoc.primary_destination)) {
7225                         /* ran dry for primary network net */
7226                         SCTP_STAT_INCR(sctps_primary_randry);
7227                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7228                         /* ran dry with CMT on */
7229                         SCTP_STAT_INCR(sctps_cmt_randry);
7230                 }
7231         }
7232 }
7233
7234 void
7235 sctp_fix_ecn_echo(struct sctp_association *asoc)
7236 {
7237         struct sctp_tmit_chunk *chk;
7238
7239         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7240                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7241                         chk->sent = SCTP_DATAGRAM_UNSENT;
7242                 }
7243         }
7244 }
7245
7246 static void
7247 sctp_move_to_an_alt(struct sctp_tcb *stcb,
7248     struct sctp_association *asoc,
7249     struct sctp_nets *net)
7250 {
7251         struct sctp_tmit_chunk *chk;
7252         struct sctp_nets *a_net;
7253
7254         SCTP_TCB_LOCK_ASSERT(stcb);
7255         /*
7256          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
7257          * destination using the PF algorithm for finding alternate
7258          * destinations.
7259          */
7260         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
7261                 a_net = sctp_find_alternate_net(stcb, net, 2);
7262         } else {
7263                 a_net = sctp_find_alternate_net(stcb, net, 0);
7264         }
7265         if ((a_net != net) &&
7266             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
7267                 /*
7268                  * We only proceed if a valid alternate is found that is not
7269                  * this one and is reachable. Here we must move all chunks
7270                  * queued in the send queue off of the destination address
7271                  * to our alternate.
7272                  */
7273                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7274                         if (chk->whoTo == net) {
7275                                 /* Move the chunk to our alternate */
7276                                 sctp_free_remote_addr(chk->whoTo);
7277                                 chk->whoTo = a_net;
7278                                 atomic_add_int(&a_net->ref_count, 1);
7279                         }
7280                 }
7281         }
7282 }
7283
7284 int
7285 sctp_med_chunk_output(struct sctp_inpcb *inp,
7286     struct sctp_tcb *stcb,
7287     struct sctp_association *asoc,
7288     int *num_out,
7289     int *reason_code,
7290     int control_only, int *cwnd_full, int from_where,
7291     struct timeval *now, int *now_filled, int frag_point, int so_locked
7292 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7293     SCTP_UNUSED
7294 #endif
7295 )
7296 {
7297         /*
7298          * Ok this is the generic chunk service queue. we must do the
7299          * following: - Service the stream queue that is next, moving any
7300          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7301          * LAST to the out queue in one pass) and assigning TSN's - Check to
7302          * see if the cwnd/rwnd allows any output, if so we go ahead and
7303          * fomulate and send the low level chunks. Making sure to combine
7304          * any control in the control chunk queue also.
7305          */
7306         struct sctp_nets *net;
7307         struct mbuf *outchain, *endoutchain;
7308         struct sctp_tmit_chunk *chk, *nchk;
7309         struct sctphdr *shdr;
7310
7311         /* temp arrays for unlinking */
7312         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7313         int no_fragmentflg, error;
7314         int one_chunk, hbflag, skip_data_for_this_net;
7315         int asconf, cookie, no_out_cnt;
7316         int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
7317         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7318         struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
7319         int tsns_sent = 0;
7320         uint32_t auth_offset = 0;
7321         struct sctp_auth_chunk *auth = NULL;
7322
7323         /*
7324          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7325          * destination.
7326          */
7327         int pf_hbflag = 0;
7328         int quit_now = 0;
7329
7330         *num_out = 0;
7331         cwnd_full_ind = 0;
7332
7333         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7334             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7335             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7336                 eeor_mode = 1;
7337         } else {
7338                 eeor_mode = 0;
7339         }
7340         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7341         /*
7342          * First lets prime the pump. For each destination, if there is room
7343          * in the flight size, attempt to pull an MTU's worth out of the
7344          * stream queues into the general send_queue
7345          */
7346 #ifdef SCTP_AUDITING_ENABLED
7347         sctp_audit_log(0xC2, 2);
7348 #endif
7349         SCTP_TCB_LOCK_ASSERT(stcb);
7350         hbflag = 0;
7351         if ((control_only) || (asoc->stream_reset_outstanding))
7352                 no_data_chunks = 1;
7353         else
7354                 no_data_chunks = 0;
7355
7356         /* Nothing to possible to send? */
7357         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7358             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7359             TAILQ_EMPTY(&asoc->send_queue) &&
7360             TAILQ_EMPTY(&asoc->out_wheel)) {
7361                 *reason_code = 9;
7362                 return (0);
7363         }
7364         if (asoc->peers_rwnd == 0) {
7365                 /* No room in peers rwnd */
7366                 *cwnd_full = 1;
7367                 *reason_code = 1;
7368                 if (asoc->total_flight > 0) {
7369                         /* we are allowed one chunk in flight */
7370                         no_data_chunks = 1;
7371                 }
7372         }
7373         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
7374                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
7375                         /*
7376                          * for CMT we start at the next one past the one we
7377                          * last added data to.
7378                          */
7379                         if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
7380                                 goto skip_the_fill_from_streams;
7381                         }
7382                         if (asoc->last_net_data_came_from) {
7383                                 net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
7384                                 if (net == NULL) {
7385                                         net = TAILQ_FIRST(&asoc->nets);
7386                                 }
7387                         } else {
7388                                 /* back to start */
7389                                 net = TAILQ_FIRST(&asoc->nets);
7390                         }
7391
7392                         /*
7393                          * JRI-TODO: CMT-MPI. Simply set the first
7394                          * destination (net) to be optimized for the next
7395                          * message to be pulled out of the outwheel. 1. peek
7396                          * at outwheel 2. If large message, set net =
7397                          * highest_cwnd 3. If small message, set net =
7398                          * lowest rtt
7399                          */
7400                 } else {
7401                         net = asoc->primary_destination;
7402                         if (net == NULL) {
7403                                 /* TSNH */
7404                                 net = TAILQ_FIRST(&asoc->nets);
7405                         }
7406                 }
7407                 start_at = net;
7408
7409 one_more_time:
7410                 for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7411                         net->window_probe = 0;
7412                         if (old_startat && (old_startat == net)) {
7413                                 break;
7414                         }
7415                         /*
7416                          * JRI: if dest is unreachable or unconfirmed, do
7417                          * not send data to it
7418                          */
7419                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7420                                 continue;
7421                         }
7422                         /*
7423                          * JRI: if dest is in PF state, do not send data to
7424                          * it
7425                          */
7426                         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
7427                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
7428                             (net->dest_state & SCTP_ADDR_PF)) {
7429                                 continue;
7430                         }
7431                         if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
7432                                 /* nothing can be in queue for this guy */
7433                                 continue;
7434                         }
7435                         if (net->flight_size >= net->cwnd) {
7436                                 /* skip this network, no room */
7437                                 cwnd_full_ind++;
7438                                 continue;
7439                         }
7440                         /*
7441                          * JRI : this for loop we are in takes in each net,
7442                          * if its's got space in cwnd and has data sent to
7443                          * it (when CMT is off) then it calls
7444                          * sctp_fill_outqueue for the net. This gets data on
7445                          * the send queue for that network.
7446                          *
7447                          * In sctp_fill_outqueue TSN's are assigned and data is
7448                          * copied out of the stream buffers. Note mostly
7449                          * copy by reference (we hope).
7450                          */
7451                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7452                                 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7453                         }
7454                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7455                         if (quit_now) {
7456                                 /* memory alloc failure */
7457                                 no_data_chunks = 1;
7458                                 goto skip_the_fill_from_streams;
7459                         }
7460                 }
7461                 if (start_at != TAILQ_FIRST(&asoc->nets)) {
7462                         /* got to pick up the beginning stuff. */
7463                         old_startat = start_at;
7464                         start_at = net = TAILQ_FIRST(&asoc->nets);
7465                         if (old_startat)
7466                                 goto one_more_time;
7467                 }
7468         }
7469 skip_the_fill_from_streams:
7470         *cwnd_full = cwnd_full_ind;
7471
7472         /* now service each destination and send out what we can for it */
7473         /* Nothing to send? */
7474         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
7475             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
7476             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
7477                 *reason_code = 8;
7478                 return (0);
7479         }
7480         if (no_data_chunks) {
7481                 chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7482                 if (chk == NULL)
7483                         chk = TAILQ_FIRST(&asoc->control_send_queue);
7484         } else {
7485                 chk = TAILQ_FIRST(&asoc->send_queue);
7486         }
7487         if (chk) {
7488                 send_start_at = chk->whoTo;
7489         } else {
7490                 send_start_at = TAILQ_FIRST(&asoc->nets);
7491         }
7492         old_startat = NULL;
7493 again_one_more_time:
7494         for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7495                 /* how much can we send? */
7496                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7497                 if (old_startat && (old_startat == net)) {
7498                         /* through list ocmpletely. */
7499                         break;
7500                 }
7501                 tsns_sent = 0;
7502                 if (net->ref_count < 2) {
7503                         /*
7504                          * Ref-count of 1 so we cannot have data or control
7505                          * queued to this address. Skip it.
7506                          */
7507                         continue;
7508                 }
7509                 ctl_cnt = bundle_at = 0;
7510                 endoutchain = outchain = NULL;
7511                 no_fragmentflg = 1;
7512                 one_chunk = 0;
7513                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7514                         skip_data_for_this_net = 1;
7515                 } else {
7516                         skip_data_for_this_net = 0;
7517                 }
7518                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7519                         /*
7520                          * if we have a route and an ifp check to see if we
7521                          * have room to send to this guy
7522                          */
7523                         struct ifnet *ifp;
7524
7525                         ifp = net->ro.ro_rt->rt_ifp;
7526                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7527                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7528                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7529                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7530                                 }
7531                                 continue;
7532                         }
7533                 }
7534                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7535                 case AF_INET:
7536                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7537                         break;
7538 #ifdef INET6
7539                 case AF_INET6:
7540                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7541                         break;
7542 #endif
7543                 default:
7544                         /* TSNH */
7545                         mtu = net->mtu;
7546                         break;
7547                 }
7548                 mx_mtu = mtu;
7549                 to_out = 0;
7550                 if (mtu > asoc->peers_rwnd) {
7551                         if (asoc->total_flight > 0) {
7552                                 /* We have a packet in flight somewhere */
7553                                 r_mtu = asoc->peers_rwnd;
7554                         } else {
7555                                 /* We are always allowed to send one MTU out */
7556                                 one_chunk = 1;
7557                                 r_mtu = mtu;
7558                         }
7559                 } else {
7560                         r_mtu = mtu;
7561                 }
7562                 /************************/
7563                 /* ASCONF transmission */
7564                 /************************/
7565                 /* Now first lets go through the asconf queue */
7566                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
7567                     chk; chk = nchk) {
7568                         nchk = TAILQ_NEXT(chk, sctp_next);
7569                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7570                                 continue;
7571                         }
7572                         if (chk->whoTo != net) {
7573                                 /*
7574                                  * No, not sent to the network we are
7575                                  * looking at
7576                                  */
7577                                 break;
7578                         }
7579                         if (chk->data == NULL) {
7580                                 break;
7581                         }
7582                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7583                             chk->sent != SCTP_DATAGRAM_RESEND) {
7584                                 break;
7585                         }
7586                         /*
7587                          * if no AUTH is yet included and this chunk
7588                          * requires it, make sure to account for it.  We
7589                          * don't apply the size until the AUTH chunk is
7590                          * actually added below in case there is no room for
7591                          * this chunk. NOTE: we overload the use of "omtu"
7592                          * here
7593                          */
7594                         if ((auth == NULL) &&
7595                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7596                             stcb->asoc.peer_auth_chunks)) {
7597                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7598                         } else
7599                                 omtu = 0;
7600                         /* Here we do NOT factor the r_mtu */
7601                         if ((chk->send_size < (int)(mtu - omtu)) ||
7602                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7603                                 /*
7604                                  * We probably should glom the mbuf chain
7605                                  * from the chk->data for control but the
7606                                  * problem is it becomes yet one more level
7607                                  * of tracking to do if for some reason
7608                                  * output fails. Then I have got to
7609                                  * reconstruct the merged control chain.. el
7610                                  * yucko.. for now we take the easy way and
7611                                  * do the copy
7612                                  */
7613                                 /*
7614                                  * Add an AUTH chunk, if chunk requires it
7615                                  * save the offset into the chain for AUTH
7616                                  */
7617                                 if ((auth == NULL) &&
7618                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7619                                     stcb->asoc.peer_auth_chunks))) {
7620                                         outchain = sctp_add_auth_chunk(outchain,
7621                                             &endoutchain,
7622                                             &auth,
7623                                             &auth_offset,
7624                                             stcb,
7625                                             chk->rec.chunk_id.id);
7626                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7627                                 }
7628                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7629                                     (int)chk->rec.chunk_id.can_take_data,
7630                                     chk->send_size, chk->copy_by_ref);
7631                                 if (outchain == NULL) {
7632                                         *reason_code = 8;
7633                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7634                                         return (ENOMEM);
7635                                 }
7636                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7637                                 /* update our MTU size */
7638                                 if (mtu > (chk->send_size + omtu))
7639                                         mtu -= (chk->send_size + omtu);
7640                                 else
7641                                         mtu = 0;
7642                                 to_out += (chk->send_size + omtu);
7643                                 /* Do clear IP_DF ? */
7644                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7645                                         no_fragmentflg = 0;
7646                                 }
7647                                 if (chk->rec.chunk_id.can_take_data)
7648                                         chk->data = NULL;
7649                                 /*
7650                                  * set hb flag since we can use these for
7651                                  * RTO
7652                                  */
7653                                 hbflag = 1;
7654                                 asconf = 1;
7655                                 /*
7656                                  * should sysctl this: don't bundle data
7657                                  * with ASCONF since it requires AUTH
7658                                  */
7659                                 no_data_chunks = 1;
7660                                 chk->sent = SCTP_DATAGRAM_SENT;
7661                                 chk->snd_count++;
7662                                 if (mtu == 0) {
7663                                         /*
7664                                          * Ok we are out of room but we can
7665                                          * output without effecting the
7666                                          * flight size since this little guy
7667                                          * is a control only packet.
7668                                          */
7669                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7670                                         /*
7671                                          * do NOT clear the asconf flag as
7672                                          * it is used to do appropriate
7673                                          * source address selection.
7674                                          */
7675                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7676                                         if (outchain == NULL) {
7677                                                 /* no memory */
7678                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7679                                                 error = ENOBUFS;
7680                                                 *reason_code = 7;
7681                                                 continue;
7682                                         }
7683                                         shdr = mtod(outchain, struct sctphdr *);
7684                                         shdr->src_port = inp->sctp_lport;
7685                                         shdr->dest_port = stcb->rport;
7686                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7687                                         shdr->checksum = 0;
7688                                         auth_offset += sizeof(struct sctphdr);
7689                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7690                                             (struct sockaddr *)&net->ro._l_addr,
7691                                             outchain, auth_offset, auth,
7692                                             no_fragmentflg, 0, NULL, asconf, net->port, so_locked, NULL))) {
7693                                                 if (error == ENOBUFS) {
7694                                                         asoc->ifp_had_enobuf = 1;
7695                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7696                                                 }
7697                                                 if (from_where == 0) {
7698                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7699                                                 }
7700                                                 if (*now_filled == 0) {
7701                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7702                                                         *now_filled = 1;
7703                                                         *now = net->last_sent_time;
7704                                                 } else {
7705                                                         net->last_sent_time = *now;
7706                                                 }
7707                                                 hbflag = 0;
7708                                                 /* error, could not output */
7709                                                 if (error == EHOSTUNREACH) {
7710                                                         /*
7711                                                          * Destination went
7712                                                          * unreachable
7713                                                          * during this send
7714                                                          */
7715                                                         sctp_move_to_an_alt(stcb, asoc, net);
7716                                                 }
7717                                                 *reason_code = 7;
7718                                                 continue;
7719                                         } else
7720                                                 asoc->ifp_had_enobuf = 0;
7721                                         if (*now_filled == 0) {
7722                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7723                                                 *now_filled = 1;
7724                                                 *now = net->last_sent_time;
7725                                         } else {
7726                                                 net->last_sent_time = *now;
7727                                         }
7728                                         hbflag = 0;
7729                                         /*
7730                                          * increase the number we sent, if a
7731                                          * cookie is sent we don't tell them
7732                                          * any was sent out.
7733                                          */
7734                                         outchain = endoutchain = NULL;
7735                                         auth = NULL;
7736                                         auth_offset = 0;
7737                                         if (!no_out_cnt)
7738                                                 *num_out += ctl_cnt;
7739                                         /* recalc a clean slate and setup */
7740                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7741                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7742                                         } else {
7743                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7744                                         }
7745                                         to_out = 0;
7746                                         no_fragmentflg = 1;
7747                                 }
7748                         }
7749                 }
7750                 /************************/
7751                 /* Control transmission */
7752                 /************************/
7753                 /* Now first lets go through the control queue */
7754                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
7755                     chk; chk = nchk) {
7756                         nchk = TAILQ_NEXT(chk, sctp_next);
7757                         if (chk->whoTo != net) {
7758                                 /*
7759                                  * No, not sent to the network we are
7760                                  * looking at
7761                                  */
7762                                 continue;
7763                         }
7764                         if (chk->data == NULL) {
7765                                 continue;
7766                         }
7767                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7768                                 /*
7769                                  * It must be unsent. Cookies and ASCONF's
7770                                  * hang around but there timers will force
7771                                  * when marked for resend.
7772                                  */
7773                                 continue;
7774                         }
7775                         /*
7776                          * if no AUTH is yet included and this chunk
7777                          * requires it, make sure to account for it.  We
7778                          * don't apply the size until the AUTH chunk is
7779                          * actually added below in case there is no room for
7780                          * this chunk. NOTE: we overload the use of "omtu"
7781                          * here
7782                          */
7783                         if ((auth == NULL) &&
7784                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7785                             stcb->asoc.peer_auth_chunks)) {
7786                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7787                         } else
7788                                 omtu = 0;
7789                         /* Here we do NOT factor the r_mtu */
7790                         if ((chk->send_size < (int)(mtu - omtu)) ||
7791                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7792                                 /*
7793                                  * We probably should glom the mbuf chain
7794                                  * from the chk->data for control but the
7795                                  * problem is it becomes yet one more level
7796                                  * of tracking to do if for some reason
7797                                  * output fails. Then I have got to
7798                                  * reconstruct the merged control chain.. el
7799                                  * yucko.. for now we take the easy way and
7800                                  * do the copy
7801                                  */
7802                                 /*
7803                                  * Add an AUTH chunk, if chunk requires it
7804                                  * save the offset into the chain for AUTH
7805                                  */
7806                                 if ((auth == NULL) &&
7807                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7808                                     stcb->asoc.peer_auth_chunks))) {
7809                                         outchain = sctp_add_auth_chunk(outchain,
7810                                             &endoutchain,
7811                                             &auth,
7812                                             &auth_offset,
7813                                             stcb,
7814                                             chk->rec.chunk_id.id);
7815                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7816                                 }
7817                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7818                                     (int)chk->rec.chunk_id.can_take_data,
7819                                     chk->send_size, chk->copy_by_ref);
7820                                 if (outchain == NULL) {
7821                                         *reason_code = 8;
7822                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7823                                         return (ENOMEM);
7824                                 }
7825                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7826                                 /* update our MTU size */
7827                                 if (mtu > (chk->send_size + omtu))
7828                                         mtu -= (chk->send_size + omtu);
7829                                 else
7830                                         mtu = 0;
7831                                 to_out += (chk->send_size + omtu);
7832                                 /* Do clear IP_DF ? */
7833                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7834                                         no_fragmentflg = 0;
7835                                 }
7836                                 if (chk->rec.chunk_id.can_take_data)
7837                                         chk->data = NULL;
7838                                 /* Mark things to be removed, if needed */
7839                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7840                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7841                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7842                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7843                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7844                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7845                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7846                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7847                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7848                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7849
7850                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7851                                                 hbflag = 1;
7852                                                 /*
7853                                                  * JRS 5/14/07 - Set the
7854                                                  * flag to say a heartbeat
7855                                                  * is being sent.
7856                                                  */
7857                                                 pf_hbflag = 1;
7858                                         }
7859                                         /* remove these chunks at the end */
7860                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
7861                                                 /* turn off the timer */
7862                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7863                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7864                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7865                                                 }
7866                                         }
7867                                         ctl_cnt++;
7868                                 } else {
7869                                         /*
7870                                          * Other chunks, since they have
7871                                          * timers running (i.e. COOKIE) we
7872                                          * just "trust" that it gets sent or
7873                                          * retransmitted.
7874                                          */
7875                                         ctl_cnt++;
7876                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7877                                                 cookie = 1;
7878                                                 no_out_cnt = 1;
7879                                         }
7880                                         chk->sent = SCTP_DATAGRAM_SENT;
7881                                         chk->snd_count++;
7882                                 }
7883                                 if (mtu == 0) {
7884                                         /*
7885                                          * Ok we are out of room but we can
7886                                          * output without effecting the
7887                                          * flight size since this little guy
7888                                          * is a control only packet.
7889                                          */
7890                                         if (asconf) {
7891                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7892                                                 /*
7893                                                  * do NOT clear the asconf
7894                                                  * flag as it is used to do
7895                                                  * appropriate source
7896                                                  * address selection.
7897                                                  */
7898                                         }
7899                                         if (cookie) {
7900                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7901                                                 cookie = 0;
7902                                         }
7903                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
7904                                         if (outchain == NULL) {
7905                                                 /* no memory */
7906                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
7907                                                 error = ENOBUFS;
7908                                                 goto error_out_again;
7909                                         }
7910                                         shdr = mtod(outchain, struct sctphdr *);
7911                                         shdr->src_port = inp->sctp_lport;
7912                                         shdr->dest_port = stcb->rport;
7913                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
7914                                         shdr->checksum = 0;
7915                                         auth_offset += sizeof(struct sctphdr);
7916                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7917                                             (struct sockaddr *)&net->ro._l_addr,
7918                                             outchain, auth_offset, auth,
7919                                             no_fragmentflg, 0, NULL, asconf, net->port, so_locked, NULL))) {
7920                                                 if (error == ENOBUFS) {
7921                                                         asoc->ifp_had_enobuf = 1;
7922                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7923                                                 }
7924                                                 if (from_where == 0) {
7925                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7926                                                 }
7927                                 error_out_again:
7928                                                 /* error, could not output */
7929                                                 if (hbflag) {
7930                                                         if (*now_filled == 0) {
7931                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7932                                                                 *now_filled = 1;
7933                                                                 *now = net->last_sent_time;
7934                                                         } else {
7935                                                                 net->last_sent_time = *now;
7936                                                         }
7937                                                         hbflag = 0;
7938                                                 }
7939                                                 if (error == EHOSTUNREACH) {
7940                                                         /*
7941                                                          * Destination went
7942                                                          * unreachable
7943                                                          * during this send
7944                                                          */
7945                                                         sctp_move_to_an_alt(stcb, asoc, net);
7946                                                 }
7947                                                 *reason_code = 7;
7948                                                 continue;
7949                                         } else
7950                                                 asoc->ifp_had_enobuf = 0;
7951                                         /* Only HB or ASCONF advances time */
7952                                         if (hbflag) {
7953                                                 if (*now_filled == 0) {
7954                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7955                                                         *now_filled = 1;
7956                                                         *now = net->last_sent_time;
7957                                                 } else {
7958                                                         net->last_sent_time = *now;
7959                                                 }
7960                                                 hbflag = 0;
7961                                         }
7962                                         /*
7963                                          * increase the number we sent, if a
7964                                          * cookie is sent we don't tell them
7965                                          * any was sent out.
7966                                          */
7967                                         outchain = endoutchain = NULL;
7968                                         auth = NULL;
7969                                         auth_offset = 0;
7970                                         if (!no_out_cnt)
7971                                                 *num_out += ctl_cnt;
7972                                         /* recalc a clean slate and setup */
7973                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7974                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7975                                         } else {
7976                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7977                                         }
7978                                         to_out = 0;
7979                                         no_fragmentflg = 1;
7980                                 }
7981                         }
7982                 }
7983                 /*********************/
7984                 /* Data transmission */
7985                 /*********************/
7986                 /*
7987                  * if AUTH for DATA is required and no AUTH has been added
7988                  * yet, account for this in the mtu now... if no data can be
7989                  * bundled, this adjustment won't matter anyways since the
7990                  * packet will be going out...
7991                  */
7992                 if ((auth == NULL) &&
7993                     sctp_auth_is_required_chunk(SCTP_DATA,
7994                     stcb->asoc.peer_auth_chunks)) {
7995                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7996                 }
7997                 /* now lets add any data within the MTU constraints */
7998                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7999                 case AF_INET:
8000                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8001                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8002                         else
8003                                 omtu = 0;
8004                         break;
8005 #ifdef INET6
8006                 case AF_INET6:
8007                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8008                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8009                         else
8010                                 omtu = 0;
8011                         break;
8012 #endif
8013                 default:
8014                         /* TSNH */
8015                         omtu = 0;
8016                         break;
8017                 }
8018                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) && (skip_data_for_this_net == 0)) ||
8019                     (cookie)) {
8020                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
8021                                 if (no_data_chunks) {
8022                                         /* let only control go out */
8023                                         *reason_code = 1;
8024                                         break;
8025                                 }
8026                                 if (net->flight_size >= net->cwnd) {
8027                                         /* skip this net, no room for data */
8028                                         *reason_code = 2;
8029                                         break;
8030                                 }
8031                                 nchk = TAILQ_NEXT(chk, sctp_next);
8032                                 if (chk->whoTo != net) {
8033                                         /* No, not sent to this net */
8034                                         continue;
8035                                 }
8036                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8037                                         /*-
8038                                          * strange, we have a chunk that is
8039                                          * to big for its destination and
8040                                          * yet no fragment ok flag.
8041                                          * Something went wrong when the
8042                                          * PMTU changed...we did not mark
8043                                          * this chunk for some reason?? I
8044                                          * will fix it here by letting IP
8045                                          * fragment it for now and printing
8046                                          * a warning. This really should not
8047                                          * happen ...
8048                                          */
8049                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8050                                             chk->send_size, mtu);
8051                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8052                                 }
8053                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8054                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8055                                         struct sctp_data_chunk *dchkh;
8056
8057                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8058                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8059                                 }
8060                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8061                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8062                                         /* ok we will add this one */
8063
8064                                         /*
8065                                          * Add an AUTH chunk, if chunk
8066                                          * requires it, save the offset into
8067                                          * the chain for AUTH
8068                                          */
8069                                         if ((auth == NULL) &&
8070                                             (sctp_auth_is_required_chunk(SCTP_DATA,
8071                                             stcb->asoc.peer_auth_chunks))) {
8072
8073                                                 outchain = sctp_add_auth_chunk(outchain,
8074                                                     &endoutchain,
8075                                                     &auth,
8076                                                     &auth_offset,
8077                                                     stcb,
8078                                                     SCTP_DATA);
8079                                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8080                                         }
8081                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8082                                             chk->send_size, chk->copy_by_ref);
8083                                         if (outchain == NULL) {
8084                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8085                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8086                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8087                                                 }
8088                                                 *reason_code = 3;
8089                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8090                                                 return (ENOMEM);
8091                                         }
8092                                         /* upate our MTU size */
8093                                         /* Do clear IP_DF ? */
8094                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8095                                                 no_fragmentflg = 0;
8096                                         }
8097                                         /* unsigned subtraction of mtu */
8098                                         if (mtu > chk->send_size)
8099                                                 mtu -= chk->send_size;
8100                                         else
8101                                                 mtu = 0;
8102                                         /* unsigned subtraction of r_mtu */
8103                                         if (r_mtu > chk->send_size)
8104                                                 r_mtu -= chk->send_size;
8105                                         else
8106                                                 r_mtu = 0;
8107
8108                                         to_out += chk->send_size;
8109                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8110 #ifdef INVARIANTS
8111                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8112 #else
8113                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8114                                                     mx_mtu, to_out);
8115 #endif
8116                                         }
8117                                         chk->window_probe = 0;
8118                                         data_list[bundle_at++] = chk;
8119                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8120                                                 mtu = 0;
8121                                                 break;
8122                                         }
8123                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8124                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8125                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8126                                                 } else {
8127                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8128                                                 }
8129                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8130                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8131                                                         /*
8132                                                          * Count number of
8133                                                          * user msg's that
8134                                                          * were fragmented
8135                                                          * we do this by
8136                                                          * counting when we
8137                                                          * see a LAST
8138                                                          * fragment only.
8139                                                          */
8140                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8141                                         }
8142                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8143                                                 if (one_chunk) {
8144                                                         data_list[0]->window_probe = 1;
8145                                                         net->window_probe = 1;
8146                                                 }
8147                                                 break;
8148                                         }
8149                                 } else {
8150                                         /*
8151                                          * Must be sent in order of the
8152                                          * TSN's (on a network)
8153                                          */
8154                                         break;
8155                                 }
8156                         }       /* for (chunk gather loop for this net) */
8157                 }               /* if asoc.state OPEN */
8158                 /* Is there something to send for this destination? */
8159                 if (outchain) {
8160                         /* We may need to start a control timer or two */
8161                         if (asconf) {
8162                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8163                                     stcb, net);
8164                                 /*
8165                                  * do NOT clear the asconf flag as it is
8166                                  * used to do appropriate source address
8167                                  * selection.
8168                                  */
8169                         }
8170                         if (cookie) {
8171                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8172                                 cookie = 0;
8173                         }
8174                         /* must start a send timer if data is being sent */
8175                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8176                                 /*
8177                                  * no timer running on this destination
8178                                  * restart it.
8179                                  */
8180                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8181                         } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
8182                                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
8183                                     pf_hbflag &&
8184                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8185                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8186                                 /*
8187                                  * JRS 5/14/07 - If a HB has been sent to a
8188                                  * PF destination and no T3 timer is
8189                                  * currently running, start the T3 timer to
8190                                  * track the HBs that were sent.
8191                                  */
8192                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8193                         }
8194                         /* Now send it, if there is anything to send :> */
8195                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
8196                         if (outchain == NULL) {
8197                                 /* out of mbufs */
8198                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8199                                 error = ENOBUFS;
8200                                 goto errored_send;
8201                         }
8202                         shdr = mtod(outchain, struct sctphdr *);
8203                         shdr->src_port = inp->sctp_lport;
8204                         shdr->dest_port = stcb->rport;
8205                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8206                         shdr->checksum = 0;
8207                         auth_offset += sizeof(struct sctphdr);
8208                         if ((error = sctp_lowlevel_chunk_output(inp,
8209                             stcb,
8210                             net,
8211                             (struct sockaddr *)&net->ro._l_addr,
8212                             outchain,
8213                             auth_offset,
8214                             auth,
8215                             no_fragmentflg,
8216                             bundle_at,
8217                             data_list[0],
8218                             asconf, net->port, so_locked, NULL))) {
8219                                 /* error, we could not output */
8220                                 if (error == ENOBUFS) {
8221                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8222                                         asoc->ifp_had_enobuf = 1;
8223                                 }
8224                                 if (from_where == 0) {
8225                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8226                                 }
8227                 errored_send:
8228                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8229                                 if (hbflag) {
8230                                         if (*now_filled == 0) {
8231                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8232                                                 *now_filled = 1;
8233                                                 *now = net->last_sent_time;
8234                                         } else {
8235                                                 net->last_sent_time = *now;
8236                                         }
8237                                         hbflag = 0;
8238                                 }
8239                                 if (error == EHOSTUNREACH) {
8240                                         /*
8241                                          * Destination went unreachable
8242                                          * during this send
8243                                          */
8244                                         sctp_move_to_an_alt(stcb, asoc, net);
8245                                 }
8246                                 *reason_code = 6;
8247                                 /*-
8248                                  * I add this line to be paranoid. As far as
8249                                  * I can tell the continue, takes us back to
8250                                  * the top of the for, but just to make sure
8251                                  * I will reset these again here.
8252                                  */
8253                                 ctl_cnt = bundle_at = 0;
8254                                 continue;       /* This takes us back to the
8255                                                  * for() for the nets. */
8256                         } else {
8257                                 asoc->ifp_had_enobuf = 0;
8258                         }
8259                         outchain = endoutchain = NULL;
8260                         auth = NULL;
8261                         auth_offset = 0;
8262                         if (bundle_at || hbflag) {
8263                                 /* For data/asconf and hb set time */
8264                                 if (*now_filled == 0) {
8265                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8266                                         *now_filled = 1;
8267                                         *now = net->last_sent_time;
8268                                 } else {
8269                                         net->last_sent_time = *now;
8270                                 }
8271                         }
8272                         if (!no_out_cnt) {
8273                                 *num_out += (ctl_cnt + bundle_at);
8274                         }
8275                         if (bundle_at) {
8276                                 /* setup for a RTO measurement */
8277                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8278                                 /* fill time if not already filled */
8279                                 if (*now_filled == 0) {
8280                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8281                                         *now_filled = 1;
8282                                         *now = asoc->time_last_sent;
8283                                 } else {
8284                                         asoc->time_last_sent = *now;
8285                                 }
8286                                 data_list[0]->do_rtt = 1;
8287                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8288                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8289                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8290                                         if (net->flight_size < net->cwnd) {
8291                                                 /* start or restart it */
8292                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8293                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8294                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8295                                                 }
8296                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8297                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8298                                         } else {
8299                                                 /* stop it if its running */
8300                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8301                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8302                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8303                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8304                                                 }
8305                                         }
8306                                 }
8307                         }
8308                         if (one_chunk) {
8309                                 break;
8310                         }
8311                 }
8312                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8313                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8314                 }
8315         }
8316         if (old_startat == NULL) {
8317                 old_startat = send_start_at;
8318                 send_start_at = TAILQ_FIRST(&asoc->nets);
8319                 if (old_startat)
8320                         goto again_one_more_time;
8321         }
8322         /*
8323          * At the end there should be no NON timed chunks hanging on this
8324          * queue.
8325          */
8326         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8327                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8328         }
8329         if ((*num_out == 0) && (*reason_code == 0)) {
8330                 *reason_code = 4;
8331         } else {
8332                 *reason_code = 5;
8333         }
8334         sctp_clean_up_ctl(stcb, asoc);
8335         return (0);
8336 }
8337
8338 void
8339 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8340 {
8341         /*-
8342          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8343          * the control chunk queue.
8344          */
8345         struct sctp_chunkhdr *hdr;
8346         struct sctp_tmit_chunk *chk;
8347         struct mbuf *mat;
8348
8349         SCTP_TCB_LOCK_ASSERT(stcb);
8350         sctp_alloc_a_chunk(stcb, chk);
8351         if (chk == NULL) {
8352                 /* no memory */
8353                 sctp_m_freem(op_err);
8354                 return;
8355         }
8356         chk->copy_by_ref = 0;
8357         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8358         if (op_err == NULL) {
8359                 sctp_free_a_chunk(stcb, chk);
8360                 return;
8361         }
8362         chk->send_size = 0;
8363         mat = op_err;
8364         while (mat != NULL) {
8365                 chk->send_size += SCTP_BUF_LEN(mat);
8366                 mat = SCTP_BUF_NEXT(mat);
8367         }
8368         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8369         chk->rec.chunk_id.can_take_data = 1;
8370         chk->sent = SCTP_DATAGRAM_UNSENT;
8371         chk->snd_count = 0;
8372         chk->flags = 0;
8373         chk->asoc = &stcb->asoc;
8374         chk->data = op_err;
8375         chk->whoTo = chk->asoc->primary_destination;
8376         atomic_add_int(&chk->whoTo->ref_count, 1);
8377         hdr = mtod(op_err, struct sctp_chunkhdr *);
8378         hdr->chunk_type = SCTP_OPERATION_ERROR;
8379         hdr->chunk_flags = 0;
8380         hdr->chunk_length = htons(chk->send_size);
8381         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8382             chk,
8383             sctp_next);
8384         chk->asoc->ctrl_queue_cnt++;
8385 }
8386
8387 int
8388 sctp_send_cookie_echo(struct mbuf *m,
8389     int offset,
8390     struct sctp_tcb *stcb,
8391     struct sctp_nets *net)
8392 {
8393         /*-
8394          * pull out the cookie and put it at the front of the control chunk
8395          * queue.
8396          */
8397         int at;
8398         struct mbuf *cookie;
8399         struct sctp_paramhdr parm, *phdr;
8400         struct sctp_chunkhdr *hdr;
8401         struct sctp_tmit_chunk *chk;
8402         uint16_t ptype, plen;
8403
8404         /* First find the cookie in the param area */
8405         cookie = NULL;
8406         at = offset + sizeof(struct sctp_init_chunk);
8407
8408         SCTP_TCB_LOCK_ASSERT(stcb);
8409         do {
8410                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8411                 if (phdr == NULL) {
8412                         return (-3);
8413                 }
8414                 ptype = ntohs(phdr->param_type);
8415                 plen = ntohs(phdr->param_length);
8416                 if (ptype == SCTP_STATE_COOKIE) {
8417                         int pad;
8418
8419                         /* found the cookie */
8420                         if ((pad = (plen % 4))) {
8421                                 plen += 4 - pad;
8422                         }
8423                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8424                         if (cookie == NULL) {
8425                                 /* No memory */
8426                                 return (-2);
8427                         }
8428 #ifdef SCTP_MBUF_LOGGING
8429                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8430                                 struct mbuf *mat;
8431
8432                                 mat = cookie;
8433                                 while (mat) {
8434                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8435                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8436                                         }
8437                                         mat = SCTP_BUF_NEXT(mat);
8438                                 }
8439                         }
8440 #endif
8441                         break;
8442                 }
8443                 at += SCTP_SIZE32(plen);
8444         } while (phdr);
8445         if (cookie == NULL) {
8446                 /* Did not find the cookie */
8447                 return (-3);
8448         }
8449         /* ok, we got the cookie lets change it into a cookie echo chunk */
8450
8451         /* first the change from param to cookie */
8452         hdr = mtod(cookie, struct sctp_chunkhdr *);
8453         hdr->chunk_type = SCTP_COOKIE_ECHO;
8454         hdr->chunk_flags = 0;
8455         /* get the chunk stuff now and place it in the FRONT of the queue */
8456         sctp_alloc_a_chunk(stcb, chk);
8457         if (chk == NULL) {
8458                 /* no memory */
8459                 sctp_m_freem(cookie);
8460                 return (-5);
8461         }
8462         chk->copy_by_ref = 0;
8463         chk->send_size = plen;
8464         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8465         chk->rec.chunk_id.can_take_data = 0;
8466         chk->sent = SCTP_DATAGRAM_UNSENT;
8467         chk->snd_count = 0;
8468         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8469         chk->asoc = &stcb->asoc;
8470         chk->data = cookie;
8471         chk->whoTo = chk->asoc->primary_destination;
8472         atomic_add_int(&chk->whoTo->ref_count, 1);
8473         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8474         chk->asoc->ctrl_queue_cnt++;
8475         return (0);
8476 }
8477
8478 void
8479 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8480     struct mbuf *m,
8481     int offset,
8482     int chk_length,
8483     struct sctp_nets *net)
8484 {
8485         /*
8486          * take a HB request and make it into a HB ack and send it.
8487          */
8488         struct mbuf *outchain;
8489         struct sctp_chunkhdr *chdr;
8490         struct sctp_tmit_chunk *chk;
8491
8492
8493         if (net == NULL)
8494                 /* must have a net pointer */
8495                 return;
8496
8497         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8498         if (outchain == NULL) {
8499                 /* gak out of memory */
8500                 return;
8501         }
8502 #ifdef SCTP_MBUF_LOGGING
8503         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8504                 struct mbuf *mat;
8505
8506                 mat = outchain;
8507                 while (mat) {
8508                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8509                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8510                         }
8511                         mat = SCTP_BUF_NEXT(mat);
8512                 }
8513         }
8514 #endif
8515         chdr = mtod(outchain, struct sctp_chunkhdr *);
8516         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8517         chdr->chunk_flags = 0;
8518         if (chk_length % 4) {
8519                 /* need pad */
8520                 uint32_t cpthis = 0;
8521                 int padlen;
8522
8523                 padlen = 4 - (chk_length % 4);
8524                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8525         }
8526         sctp_alloc_a_chunk(stcb, chk);
8527         if (chk == NULL) {
8528                 /* no memory */
8529                 sctp_m_freem(outchain);
8530                 return;
8531         }
8532         chk->copy_by_ref = 0;
8533         chk->send_size = chk_length;
8534         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8535         chk->rec.chunk_id.can_take_data = 1;
8536         chk->sent = SCTP_DATAGRAM_UNSENT;
8537         chk->snd_count = 0;
8538         chk->flags = 0;
8539         chk->asoc = &stcb->asoc;
8540         chk->data = outchain;
8541         chk->whoTo = net;
8542         atomic_add_int(&chk->whoTo->ref_count, 1);
8543         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8544         chk->asoc->ctrl_queue_cnt++;
8545 }
8546
8547 void
8548 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8549 {
8550         /* formulate and queue a cookie-ack back to sender */
8551         struct mbuf *cookie_ack;
8552         struct sctp_chunkhdr *hdr;
8553         struct sctp_tmit_chunk *chk;
8554
8555         cookie_ack = NULL;
8556         SCTP_TCB_LOCK_ASSERT(stcb);
8557
8558         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8559         if (cookie_ack == NULL) {
8560                 /* no mbuf's */
8561                 return;
8562         }
8563         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8564         sctp_alloc_a_chunk(stcb, chk);
8565         if (chk == NULL) {
8566                 /* no memory */
8567                 sctp_m_freem(cookie_ack);
8568                 return;
8569         }
8570         chk->copy_by_ref = 0;
8571         chk->send_size = sizeof(struct sctp_chunkhdr);
8572         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8573         chk->rec.chunk_id.can_take_data = 1;
8574         chk->sent = SCTP_DATAGRAM_UNSENT;
8575         chk->snd_count = 0;
8576         chk->flags = 0;
8577         chk->asoc = &stcb->asoc;
8578         chk->data = cookie_ack;
8579         if (chk->asoc->last_control_chunk_from != NULL) {
8580                 chk->whoTo = chk->asoc->last_control_chunk_from;
8581         } else {
8582                 chk->whoTo = chk->asoc->primary_destination;
8583         }
8584         atomic_add_int(&chk->whoTo->ref_count, 1);
8585         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8586         hdr->chunk_type = SCTP_COOKIE_ACK;
8587         hdr->chunk_flags = 0;
8588         hdr->chunk_length = htons(chk->send_size);
8589         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8590         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8591         chk->asoc->ctrl_queue_cnt++;
8592         return;
8593 }
8594
8595
8596 void
8597 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8598 {
8599         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8600         struct mbuf *m_shutdown_ack;
8601         struct sctp_shutdown_ack_chunk *ack_cp;
8602         struct sctp_tmit_chunk *chk;
8603
8604         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8605         if (m_shutdown_ack == NULL) {
8606                 /* no mbuf's */
8607                 return;
8608         }
8609         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8610         sctp_alloc_a_chunk(stcb, chk);
8611         if (chk == NULL) {
8612                 /* no memory */
8613                 sctp_m_freem(m_shutdown_ack);
8614                 return;
8615         }
8616         chk->copy_by_ref = 0;
8617         chk->send_size = sizeof(struct sctp_chunkhdr);
8618         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8619         chk->rec.chunk_id.can_take_data = 1;
8620         chk->sent = SCTP_DATAGRAM_UNSENT;
8621         chk->snd_count = 0;
8622         chk->flags = 0;
8623         chk->asoc = &stcb->asoc;
8624         chk->data = m_shutdown_ack;
8625         chk->whoTo = net;
8626         atomic_add_int(&net->ref_count, 1);
8627
8628         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8629         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8630         ack_cp->ch.chunk_flags = 0;
8631         ack_cp->ch.chunk_length = htons(chk->send_size);
8632         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8633         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8634         chk->asoc->ctrl_queue_cnt++;
8635         return;
8636 }
8637
8638 void
8639 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8640 {
8641         /* formulate and queue a SHUTDOWN to the sender */
8642         struct mbuf *m_shutdown;
8643         struct sctp_shutdown_chunk *shutdown_cp;
8644         struct sctp_tmit_chunk *chk;
8645
8646         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8647         if (m_shutdown == NULL) {
8648                 /* no mbuf's */
8649                 return;
8650         }
8651         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8652         sctp_alloc_a_chunk(stcb, chk);
8653         if (chk == NULL) {
8654                 /* no memory */
8655                 sctp_m_freem(m_shutdown);
8656                 return;
8657         }
8658         chk->copy_by_ref = 0;
8659         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8660         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8661         chk->rec.chunk_id.can_take_data = 1;
8662         chk->sent = SCTP_DATAGRAM_UNSENT;
8663         chk->snd_count = 0;
8664         chk->flags = 0;
8665         chk->asoc = &stcb->asoc;
8666         chk->data = m_shutdown;
8667         chk->whoTo = net;
8668         atomic_add_int(&net->ref_count, 1);
8669
8670         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8671         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8672         shutdown_cp->ch.chunk_flags = 0;
8673         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8674         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8675         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8676         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8677         chk->asoc->ctrl_queue_cnt++;
8678         return;
8679 }
8680
8681 void
8682 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8683 {
8684         /*
8685          * formulate and queue an ASCONF to the peer. ASCONF parameters
8686          * should be queued on the assoc queue.
8687          */
8688         struct sctp_tmit_chunk *chk;
8689         struct mbuf *m_asconf;
8690         int len;
8691
8692         SCTP_TCB_LOCK_ASSERT(stcb);
8693
8694         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8695             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8696                 /* can't send a new one if there is one in flight already */
8697                 return;
8698         }
8699         /* compose an ASCONF chunk, maximum length is PMTU */
8700         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8701         if (m_asconf == NULL) {
8702                 return;
8703         }
8704         sctp_alloc_a_chunk(stcb, chk);
8705         if (chk == NULL) {
8706                 /* no memory */
8707                 sctp_m_freem(m_asconf);
8708                 return;
8709         }
8710         chk->copy_by_ref = 0;
8711         chk->data = m_asconf;
8712         chk->send_size = len;
8713         chk->rec.chunk_id.id = SCTP_ASCONF;
8714         chk->rec.chunk_id.can_take_data = 0;
8715         chk->sent = SCTP_DATAGRAM_UNSENT;
8716         chk->snd_count = 0;
8717         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8718         chk->asoc = &stcb->asoc;
8719         chk->whoTo = net;
8720         atomic_add_int(&chk->whoTo->ref_count, 1);
8721         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8722         chk->asoc->ctrl_queue_cnt++;
8723         return;
8724 }
8725
8726 void
8727 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8728 {
8729         /*
8730          * formulate and queue a asconf-ack back to sender. the asconf-ack
8731          * must be stored in the tcb.
8732          */
8733         struct sctp_tmit_chunk *chk;
8734         struct sctp_asconf_ack *ack, *latest_ack;
8735         struct mbuf *m_ack, *m;
8736         struct sctp_nets *net = NULL;
8737
8738         SCTP_TCB_LOCK_ASSERT(stcb);
8739         /* Get the latest ASCONF-ACK */
8740         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8741         if (latest_ack == NULL) {
8742                 return;
8743         }
8744         if (latest_ack->last_sent_to != NULL &&
8745             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8746                 /* we're doing a retransmission */
8747                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8748                 if (net == NULL) {
8749                         /* no alternate */
8750                         if (stcb->asoc.last_control_chunk_from == NULL)
8751                                 net = stcb->asoc.primary_destination;
8752                         else
8753                                 net = stcb->asoc.last_control_chunk_from;
8754                 }
8755         } else {
8756                 /* normal case */
8757                 if (stcb->asoc.last_control_chunk_from == NULL)
8758                         net = stcb->asoc.primary_destination;
8759                 else
8760                         net = stcb->asoc.last_control_chunk_from;
8761         }
8762         latest_ack->last_sent_to = net;
8763
8764         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8765                 if (ack->data == NULL) {
8766                         continue;
8767                 }
8768                 /* copy the asconf_ack */
8769                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8770                 if (m_ack == NULL) {
8771                         /* couldn't copy it */
8772                         return;
8773                 }
8774 #ifdef SCTP_MBUF_LOGGING
8775                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8776                         struct mbuf *mat;
8777
8778                         mat = m_ack;
8779                         while (mat) {
8780                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8781                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8782                                 }
8783                                 mat = SCTP_BUF_NEXT(mat);
8784                         }
8785                 }
8786 #endif
8787
8788                 sctp_alloc_a_chunk(stcb, chk);
8789                 if (chk == NULL) {
8790                         /* no memory */
8791                         if (m_ack)
8792                                 sctp_m_freem(m_ack);
8793                         return;
8794                 }
8795                 chk->copy_by_ref = 0;
8796
8797                 chk->whoTo = net;
8798                 chk->data = m_ack;
8799                 chk->send_size = 0;
8800                 /* Get size */
8801                 m = m_ack;
8802                 chk->send_size = ack->len;
8803                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8804                 chk->rec.chunk_id.can_take_data = 1;
8805                 chk->sent = SCTP_DATAGRAM_UNSENT;
8806                 chk->snd_count = 0;
8807                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8808                 chk->asoc = &stcb->asoc;
8809                 atomic_add_int(&chk->whoTo->ref_count, 1);
8810
8811                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8812                 chk->asoc->ctrl_queue_cnt++;
8813         }
8814         return;
8815 }
8816
8817
8818 static int
8819 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8820     struct sctp_tcb *stcb,
8821     struct sctp_association *asoc,
8822     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8823 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8824     SCTP_UNUSED
8825 #endif
8826 )
8827 {
8828         /*-
8829          * send out one MTU of retransmission. If fast_retransmit is
8830          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8831          * rwnd. For a Cookie or Asconf in the control chunk queue we
8832          * retransmit them by themselves.
8833          *
8834          * For data chunks we will pick out the lowest TSN's in the sent_queue
8835          * marked for resend and bundle them all together (up to a MTU of
8836          * destination). The address to send to should have been
8837          * selected/changed where the retransmission was marked (i.e. in FR
8838          * or t3-timeout routines).
8839          */
8840         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8841         struct sctp_tmit_chunk *chk, *fwd;
8842         struct mbuf *m, *endofchain;
8843         struct sctphdr *shdr;
8844         struct sctp_nets *net = NULL;
8845         uint32_t tsns_sent = 0;
8846         int no_fragmentflg, bundle_at, cnt_thru;
8847         unsigned int mtu;
8848         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8849         struct sctp_auth_chunk *auth = NULL;
8850         uint32_t auth_offset = 0;
8851         uint32_t dmtu = 0;
8852
8853         SCTP_TCB_LOCK_ASSERT(stcb);
8854         tmr_started = ctl_cnt = bundle_at = error = 0;
8855         no_fragmentflg = 1;
8856         fwd_tsn = 0;
8857         *cnt_out = 0;
8858         fwd = NULL;
8859         endofchain = m = NULL;
8860 #ifdef SCTP_AUDITING_ENABLED
8861         sctp_audit_log(0xC3, 1);
8862 #endif
8863         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8864             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8865                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8866                     asoc->sent_queue_retran_cnt);
8867                 asoc->sent_queue_cnt = 0;
8868                 asoc->sent_queue_cnt_removeable = 0;
8869                 /* send back 0/0 so we enter normal transmission */
8870                 *cnt_out = 0;
8871                 return (0);
8872         }
8873         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8874                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8875                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8876                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8877                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8878                                 if (chk != asoc->str_reset) {
8879                                         /*
8880                                          * not eligible for retran if its
8881                                          * not ours
8882                                          */
8883                                         continue;
8884                                 }
8885                         }
8886                         ctl_cnt++;
8887                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8888                                 fwd_tsn = 1;
8889                                 fwd = chk;
8890                         }
8891                         /*
8892                          * Add an AUTH chunk, if chunk requires it save the
8893                          * offset into the chain for AUTH
8894                          */
8895                         if ((auth == NULL) &&
8896                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8897                             stcb->asoc.peer_auth_chunks))) {
8898                                 m = sctp_add_auth_chunk(m, &endofchain,
8899                                     &auth, &auth_offset,
8900                                     stcb,
8901                                     chk->rec.chunk_id.id);
8902                         }
8903                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8904                         break;
8905                 }
8906         }
8907         one_chunk = 0;
8908         cnt_thru = 0;
8909         /* do we have control chunks to retransmit? */
8910         if (m != NULL) {
8911                 /* Start a timer no matter if we suceed or fail */
8912                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8913                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8914                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8915                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8916
8917                 SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
8918                 if (m == NULL) {
8919                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
8920                         return (ENOBUFS);
8921                 }
8922                 shdr = mtod(m, struct sctphdr *);
8923                 shdr->src_port = inp->sctp_lport;
8924                 shdr->dest_port = stcb->rport;
8925                 shdr->v_tag = htonl(stcb->asoc.peer_vtag);
8926                 shdr->checksum = 0;
8927                 auth_offset += sizeof(struct sctphdr);
8928                 chk->snd_count++;       /* update our count */
8929
8930                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8931                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m, auth_offset,
8932                     auth, no_fragmentflg, 0, NULL, 0, chk->whoTo->port, so_locked, NULL))) {
8933                         SCTP_STAT_INCR(sctps_lowlevelerr);
8934                         return (error);
8935                 }
8936                 m = endofchain = NULL;
8937                 auth = NULL;
8938                 auth_offset = 0;
8939                 /*
8940                  * We don't want to mark the net->sent time here since this
8941                  * we use this for HB and retrans cannot measure RTT
8942                  */
8943                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8944                 *cnt_out += 1;
8945                 chk->sent = SCTP_DATAGRAM_SENT;
8946                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
8947                 if (fwd_tsn == 0) {
8948                         return (0);
8949                 } else {
8950                         /* Clean up the fwd-tsn list */
8951                         sctp_clean_up_ctl(stcb, asoc);
8952                         return (0);
8953                 }
8954         }
8955         /*
8956          * Ok, it is just data retransmission we need to do or that and a
8957          * fwd-tsn with it all.
8958          */
8959         if (TAILQ_EMPTY(&asoc->sent_queue)) {
8960                 return (SCTP_RETRAN_DONE);
8961         }
8962         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
8963             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
8964                 /* not yet open, resend the cookie and that is it */
8965                 return (1);
8966         }
8967 #ifdef SCTP_AUDITING_ENABLED
8968         sctp_auditing(20, inp, stcb, NULL);
8969 #endif
8970         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
8971                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
8972                         /* No, not sent to this net or not ready for rtx */
8973                         continue;
8974                 }
8975                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
8976                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
8977                         /* Gak, we have exceeded max unlucky retran, abort! */
8978                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
8979                             chk->snd_count,
8980                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
8981                         atomic_add_int(&stcb->asoc.refcnt, 1);
8982                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
8983                         SCTP_TCB_LOCK(stcb);
8984                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
8985                         return (SCTP_RETRAN_EXIT);
8986                 }
8987                 /* pick up the net */
8988                 net = chk->whoTo;
8989                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8990                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8991                 } else {
8992                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8993                 }
8994
8995                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
8996                         /* No room in peers rwnd */
8997                         uint32_t tsn;
8998
8999                         tsn = asoc->last_acked_seq + 1;
9000                         if (tsn == chk->rec.data.TSN_seq) {
9001                                 /*
9002                                  * we make a special exception for this
9003                                  * case. The peer has no rwnd but is missing
9004                                  * the lowest chunk.. which is probably what
9005                                  * is holding up the rwnd.
9006                                  */
9007                                 goto one_chunk_around;
9008                         }
9009                         return (1);
9010                 }
9011 one_chunk_around:
9012                 if (asoc->peers_rwnd < mtu) {
9013                         one_chunk = 1;
9014                         if ((asoc->peers_rwnd == 0) &&
9015                             (asoc->total_flight == 0)) {
9016                                 chk->window_probe = 1;
9017                                 chk->whoTo->window_probe = 1;
9018                         }
9019                 }
9020 #ifdef SCTP_AUDITING_ENABLED
9021                 sctp_audit_log(0xC3, 2);
9022 #endif
9023                 bundle_at = 0;
9024                 m = NULL;
9025                 net->fast_retran_ip = 0;
9026                 if (chk->rec.data.doing_fast_retransmit == 0) {
9027                         /*
9028                          * if no FR in progress skip destination that have
9029                          * flight_size > cwnd.
9030                          */
9031                         if (net->flight_size >= net->cwnd) {
9032                                 continue;
9033                         }
9034                 } else {
9035                         /*
9036                          * Mark the destination net to have FR recovery
9037                          * limits put on it.
9038                          */
9039                         *fr_done = 1;
9040                         net->fast_retran_ip = 1;
9041                 }
9042
9043                 /*
9044                  * if no AUTH is yet included and this chunk requires it,
9045                  * make sure to account for it.  We don't apply the size
9046                  * until the AUTH chunk is actually added below in case
9047                  * there is no room for this chunk.
9048                  */
9049                 if ((auth == NULL) &&
9050                     sctp_auth_is_required_chunk(SCTP_DATA,
9051                     stcb->asoc.peer_auth_chunks)) {
9052                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9053                 } else
9054                         dmtu = 0;
9055
9056                 if ((chk->send_size <= (mtu - dmtu)) ||
9057                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9058                         /* ok we will add this one */
9059                         if ((auth == NULL) &&
9060                             (sctp_auth_is_required_chunk(SCTP_DATA,
9061                             stcb->asoc.peer_auth_chunks))) {
9062                                 m = sctp_add_auth_chunk(m, &endofchain,
9063                                     &auth, &auth_offset,
9064                                     stcb, SCTP_DATA);
9065                         }
9066                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9067                         if (m == NULL) {
9068                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9069                                 return (ENOMEM);
9070                         }
9071                         /* Do clear IP_DF ? */
9072                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9073                                 no_fragmentflg = 0;
9074                         }
9075                         /* upate our MTU size */
9076                         if (mtu > (chk->send_size + dmtu))
9077                                 mtu -= (chk->send_size + dmtu);
9078                         else
9079                                 mtu = 0;
9080                         data_list[bundle_at++] = chk;
9081                         if (one_chunk && (asoc->total_flight <= 0)) {
9082                                 SCTP_STAT_INCR(sctps_windowprobed);
9083                         }
9084                 }
9085                 if (one_chunk == 0) {
9086                         /*
9087                          * now are there anymore forward from chk to pick
9088                          * up?
9089                          */
9090                         fwd = TAILQ_NEXT(chk, sctp_next);
9091                         while (fwd) {
9092                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9093                                         /* Nope, not for retran */
9094                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9095                                         continue;
9096                                 }
9097                                 if (fwd->whoTo != net) {
9098                                         /* Nope, not the net in question */
9099                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9100                                         continue;
9101                                 }
9102                                 if ((auth == NULL) &&
9103                                     sctp_auth_is_required_chunk(SCTP_DATA,
9104                                     stcb->asoc.peer_auth_chunks)) {
9105                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9106                                 } else
9107                                         dmtu = 0;
9108                                 if (fwd->send_size <= (mtu - dmtu)) {
9109                                         if ((auth == NULL) &&
9110                                             (sctp_auth_is_required_chunk(SCTP_DATA,
9111                                             stcb->asoc.peer_auth_chunks))) {
9112                                                 m = sctp_add_auth_chunk(m,
9113                                                     &endofchain,
9114                                                     &auth, &auth_offset,
9115                                                     stcb,
9116                                                     SCTP_DATA);
9117                                         }
9118                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9119                                         if (m == NULL) {
9120                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9121                                                 return (ENOMEM);
9122                                         }
9123                                         /* Do clear IP_DF ? */
9124                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9125                                                 no_fragmentflg = 0;
9126                                         }
9127                                         /* upate our MTU size */
9128                                         if (mtu > (fwd->send_size + dmtu))
9129                                                 mtu -= (fwd->send_size + dmtu);
9130                                         else
9131                                                 mtu = 0;
9132                                         data_list[bundle_at++] = fwd;
9133                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9134                                                 break;
9135                                         }
9136                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9137                                 } else {
9138                                         /* can't fit so we are done */
9139                                         break;
9140                                 }
9141                         }
9142                 }
9143                 /* Is there something to send for this destination? */
9144                 if (m) {
9145                         /*
9146                          * No matter if we fail/or suceed we should start a
9147                          * timer. A failure is like a lost IP packet :-)
9148                          */
9149                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9150                                 /*
9151                                  * no timer running on this destination
9152                                  * restart it.
9153                                  */
9154                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9155                                 tmr_started = 1;
9156                         }
9157                         SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
9158                         if (m == NULL) {
9159                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
9160                                 return (ENOBUFS);
9161                         }
9162                         shdr = mtod(m, struct sctphdr *);
9163                         shdr->src_port = inp->sctp_lport;
9164                         shdr->dest_port = stcb->rport;
9165                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
9166                         shdr->checksum = 0;
9167                         auth_offset += sizeof(struct sctphdr);
9168                         /* Now lets send it, if there is anything to send :> */
9169                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9170                             (struct sockaddr *)&net->ro._l_addr, m, auth_offset,
9171                             auth, no_fragmentflg, 0, NULL, 0, net->port, so_locked, NULL))) {
9172                                 /* error, we could not output */
9173                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9174                                 return (error);
9175                         }
9176                         m = endofchain = NULL;
9177                         auth = NULL;
9178                         auth_offset = 0;
9179                         /* For HB's */
9180                         /*
9181                          * We don't want to mark the net->sent time here
9182                          * since this we use this for HB and retrans cannot
9183                          * measure RTT
9184                          */
9185                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9186
9187                         /* For auto-close */
9188                         cnt_thru++;
9189                         if (*now_filled == 0) {
9190                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9191                                 *now = asoc->time_last_sent;
9192                                 *now_filled = 1;
9193                         } else {
9194                                 asoc->time_last_sent = *now;
9195                         }
9196                         *cnt_out += bundle_at;
9197 #ifdef SCTP_AUDITING_ENABLED
9198                         sctp_audit_log(0xC4, bundle_at);
9199 #endif
9200                         if (bundle_at) {
9201                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9202                         }
9203                         for (i = 0; i < bundle_at; i++) {
9204                                 SCTP_STAT_INCR(sctps_sendretransdata);
9205                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9206                                 /*
9207                                  * When we have a revoked data, and we
9208                                  * retransmit it, then we clear the revoked
9209                                  * flag since this flag dictates if we
9210                                  * subtracted from the fs
9211                                  */
9212                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9213                                         /* Deflate the cwnd */
9214                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9215                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9216                                 }
9217                                 data_list[i]->snd_count++;
9218                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9219                                 /* record the time */
9220                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9221                                 if (data_list[i]->book_size_scale) {
9222                                         /*
9223                                          * need to double the book size on
9224                                          * this one
9225                                          */
9226                                         data_list[i]->book_size_scale = 0;
9227                                         /*
9228                                          * Since we double the booksize, we
9229                                          * must also double the output queue
9230                                          * size, since this get shrunk when
9231                                          * we free by this amount.
9232                                          */
9233                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9234                                         data_list[i]->book_size *= 2;
9235
9236
9237                                 } else {
9238                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9239                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9240                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9241                                         }
9242                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9243                                             (uint32_t) (data_list[i]->send_size +
9244                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9245                                 }
9246                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9247                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9248                                             data_list[i]->whoTo->flight_size,
9249                                             data_list[i]->book_size,
9250                                             (uintptr_t) data_list[i]->whoTo,
9251                                             data_list[i]->rec.data.TSN_seq);
9252                                 }
9253                                 sctp_flight_size_increase(data_list[i]);
9254                                 sctp_total_flight_increase(stcb, data_list[i]);
9255                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9256                                         /* SWS sender side engages */
9257                                         asoc->peers_rwnd = 0;
9258                                 }
9259                                 if ((i == 0) &&
9260                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9261                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9262                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9263                                             (tmr_started == 0)) {
9264                                                 /*-
9265                                                  * ok we just fast-retrans'd
9266                                                  * the lowest TSN, i.e the
9267                                                  * first on the list. In
9268                                                  * this case we want to give
9269                                                  * some more time to get a
9270                                                  * SACK back without a
9271                                                  * t3-expiring.
9272                                                  */
9273                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9274                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9275                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9276                                         }
9277                                 }
9278                         }
9279                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9280                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9281                         }
9282 #ifdef SCTP_AUDITING_ENABLED
9283                         sctp_auditing(21, inp, stcb, NULL);
9284 #endif
9285                 } else {
9286                         /* None will fit */
9287                         return (1);
9288                 }
9289                 if (asoc->sent_queue_retran_cnt <= 0) {
9290                         /* all done we have no more to retran */
9291                         asoc->sent_queue_retran_cnt = 0;
9292                         break;
9293                 }
9294                 if (one_chunk) {
9295                         /* No more room in rwnd */
9296                         return (1);
9297                 }
9298                 /* stop the for loop here. we sent out a packet */
9299                 break;
9300         }
9301         return (0);
9302 }
9303
9304
9305 static int
9306 sctp_timer_validation(struct sctp_inpcb *inp,
9307     struct sctp_tcb *stcb,
9308     struct sctp_association *asoc,
9309     int ret)
9310 {
9311         struct sctp_nets *net;
9312
9313         /* Validate that a timer is running somewhere */
9314         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9315                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9316                         /* Here is a timer */
9317                         return (ret);
9318                 }
9319         }
9320         SCTP_TCB_LOCK_ASSERT(stcb);
9321         /* Gak, we did not have a timer somewhere */
9322         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9323         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9324         return (ret);
9325 }
9326
9327 void
9328 sctp_chunk_output(struct sctp_inpcb *inp,
9329     struct sctp_tcb *stcb,
9330     int from_where,
9331     int so_locked
9332 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9333     SCTP_UNUSED
9334 #endif
9335 )
9336 {
9337         /*-
9338          * Ok this is the generic chunk service queue. we must do the
9339          * following:
9340          * - See if there are retransmits pending, if so we must
9341          *   do these first.
9342          * - Service the stream queue that is next, moving any
9343          *   message (note I must get a complete message i.e.
9344          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9345          *   TSN's
9346          * - Check to see if the cwnd/rwnd allows any output, if so we
9347          *   go ahead and fomulate and send the low level chunks. Making sure
9348          *   to combine any control in the control chunk queue also.
9349          */
9350         struct sctp_association *asoc;
9351         struct sctp_nets *net;
9352         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
9353             burst_cnt = 0, burst_limit = 0;
9354         struct timeval now;
9355         int now_filled = 0;
9356         int cwnd_full = 0;
9357         int nagle_on = 0;
9358         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9359         int un_sent = 0;
9360         int fr_done, tot_frs = 0;
9361
9362         asoc = &stcb->asoc;
9363         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9364                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9365                         nagle_on = 0;
9366                 } else {
9367                         nagle_on = 1;
9368                 }
9369         }
9370         SCTP_TCB_LOCK_ASSERT(stcb);
9371
9372         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9373
9374         if ((un_sent <= 0) &&
9375             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9376             (asoc->sent_queue_retran_cnt == 0)) {
9377                 /* Nothing to do unless there is something to be sent left */
9378                 return;
9379         }
9380         /*
9381          * Do we have something to send, data or control AND a sack timer
9382          * running, if so piggy-back the sack.
9383          */
9384         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9385                 sctp_send_sack(stcb);
9386                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9387         }
9388         while (asoc->sent_queue_retran_cnt) {
9389                 /*-
9390                  * Ok, it is retransmission time only, we send out only ONE
9391                  * packet with a single call off to the retran code.
9392                  */
9393                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9394                         /*-
9395                          * Special hook for handling cookiess discarded
9396                          * by peer that carried data. Send cookie-ack only
9397                          * and then the next call with get the retran's.
9398                          */
9399                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9400                             &cwnd_full, from_where,
9401                             &now, &now_filled, frag_point, so_locked);
9402                         return;
9403                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9404                         /* if its not from a HB then do it */
9405                         fr_done = 0;
9406                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9407                         if (fr_done) {
9408                                 tot_frs++;
9409                         }
9410                 } else {
9411                         /*
9412                          * its from any other place, we don't allow retran
9413                          * output (only control)
9414                          */
9415                         ret = 1;
9416                 }
9417                 if (ret > 0) {
9418                         /* Can't send anymore */
9419                         /*-
9420                          * now lets push out control by calling med-level
9421                          * output once. this assures that we WILL send HB's
9422                          * if queued too.
9423                          */
9424                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9425                             &cwnd_full, from_where,
9426                             &now, &now_filled, frag_point, so_locked);
9427 #ifdef SCTP_AUDITING_ENABLED
9428                         sctp_auditing(8, inp, stcb, NULL);
9429 #endif
9430                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9431                         return;
9432                 }
9433                 if (ret < 0) {
9434                         /*-
9435                          * The count was off.. retran is not happening so do
9436                          * the normal retransmission.
9437                          */
9438 #ifdef SCTP_AUDITING_ENABLED
9439                         sctp_auditing(9, inp, stcb, NULL);
9440 #endif
9441                         if (ret == SCTP_RETRAN_EXIT) {
9442                                 return;
9443                         }
9444                         break;
9445                 }
9446                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9447                         /* Only one transmission allowed out of a timeout */
9448 #ifdef SCTP_AUDITING_ENABLED
9449                         sctp_auditing(10, inp, stcb, NULL);
9450 #endif
9451                         /* Push out any control */
9452                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
9453                             &now, &now_filled, frag_point, so_locked);
9454                         return;
9455                 }
9456                 if (tot_frs > asoc->max_burst) {
9457                         /* Hit FR burst limit */
9458                         return;
9459                 }
9460                 if ((num_out == 0) && (ret == 0)) {
9461
9462                         /* No more retrans to send */
9463                         break;
9464                 }
9465         }
9466 #ifdef SCTP_AUDITING_ENABLED
9467         sctp_auditing(12, inp, stcb, NULL);
9468 #endif
9469         /* Check for bad destinations, if they exist move chunks around. */
9470         burst_limit = asoc->max_burst;
9471         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9472                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9473                     SCTP_ADDR_NOT_REACHABLE) {
9474                         /*-
9475                          * if possible move things off of this address we
9476                          * still may send below due to the dormant state but
9477                          * we try to find an alternate address to send to
9478                          * and if we have one we move all queued data on the
9479                          * out wheel to this alternate address.
9480                          */
9481                         if (net->ref_count > 1)
9482                                 sctp_move_to_an_alt(stcb, asoc, net);
9483                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
9484                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
9485                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9486                         /*
9487                          * JRS 5/14/07 - If CMT PF is on and the current
9488                          * destination is in PF state, move all queued data
9489                          * to an alternate desination.
9490                          */
9491                         if (net->ref_count > 1)
9492                                 sctp_move_to_an_alt(stcb, asoc, net);
9493                 } else {
9494                         /*-
9495                          * if ((asoc->sat_network) || (net->addr_is_local))
9496                          * { burst_limit = asoc->max_burst *
9497                          * SCTP_SAT_NETWORK_BURST_INCR; }
9498                          */
9499                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9500                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
9501                                         /*
9502                                          * JRS - Use the congestion control
9503                                          * given in the congestion control
9504                                          * module
9505                                          */
9506                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
9507                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9508                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
9509                                         }
9510                                         SCTP_STAT_INCR(sctps_maxburstqueued);
9511                                 }
9512                                 net->fast_retran_ip = 0;
9513                         } else {
9514                                 if (net->flight_size == 0) {
9515                                         /* Should be decaying the cwnd here */
9516                                         ;
9517                                 }
9518                         }
9519                 }
9520
9521         }
9522         burst_cnt = 0;
9523         cwnd_full = 0;
9524         do {
9525                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9526                     &reason_code, 0, &cwnd_full, from_where,
9527                     &now, &now_filled, frag_point, so_locked);
9528                 if (error) {
9529                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9530                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9531                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9532                         }
9533                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9534                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9535                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9536                         }
9537                         break;
9538                 }
9539                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9540
9541                 tot_out += num_out;
9542                 burst_cnt++;
9543                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9544                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9545                         if (num_out == 0) {
9546                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9547                         }
9548                 }
9549                 if (nagle_on) {
9550                         /*-
9551                          * When nagle is on, we look at how much is un_sent, then
9552                          * if its smaller than an MTU and we have data in
9553                          * flight we stop.
9554                          */
9555                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9556                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9557                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9558                             (stcb->asoc.total_flight > 0)) {
9559                                 break;
9560                         }
9561                 }
9562                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9563                     TAILQ_EMPTY(&asoc->send_queue) &&
9564                     TAILQ_EMPTY(&asoc->out_wheel)) {
9565                         /* Nothing left to send */
9566                         break;
9567                 }
9568                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9569                         /* Nothing left to send */
9570                         break;
9571                 }
9572         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9573             (burst_cnt < burst_limit)));
9574
9575         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9576                 if (burst_cnt >= burst_limit) {
9577                         SCTP_STAT_INCR(sctps_maxburstqueued);
9578                         asoc->burst_limit_applied = 1;
9579                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9580                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9581                         }
9582                 } else {
9583                         asoc->burst_limit_applied = 0;
9584                 }
9585         }
9586         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9587                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9588         }
9589         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9590             tot_out);
9591
9592         /*-
9593          * Now we need to clean up the control chunk chain if a ECNE is on
9594          * it. It must be marked as UNSENT again so next call will continue
9595          * to send it until such time that we get a CWR, to remove it.
9596          */
9597         if (stcb->asoc.ecn_echo_cnt_onq)
9598                 sctp_fix_ecn_echo(asoc);
9599         return;
9600 }
9601
9602
9603 int
9604 sctp_output(inp, m, addr, control, p, flags)
9605         struct sctp_inpcb *inp;
9606         struct mbuf *m;
9607         struct sockaddr *addr;
9608         struct mbuf *control;
9609         struct thread *p;
9610         int flags;
9611 {
9612         if (inp == NULL) {
9613                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9614                 return (EINVAL);
9615         }
9616         if (inp->sctp_socket == NULL) {
9617                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9618                 return (EINVAL);
9619         }
9620         return (sctp_sosend(inp->sctp_socket,
9621             addr,
9622             (struct uio *)NULL,
9623             m,
9624             control,
9625             flags, p
9626             ));
9627 }
9628
9629 void
9630 send_forward_tsn(struct sctp_tcb *stcb,
9631     struct sctp_association *asoc)
9632 {
9633         struct sctp_tmit_chunk *chk;
9634         struct sctp_forward_tsn_chunk *fwdtsn;
9635
9636         SCTP_TCB_LOCK_ASSERT(stcb);
9637         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9638                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9639                         /* mark it to unsent */
9640                         chk->sent = SCTP_DATAGRAM_UNSENT;
9641                         chk->snd_count = 0;
9642                         /* Do we correct its output location? */
9643                         if (chk->whoTo != asoc->primary_destination) {
9644                                 sctp_free_remote_addr(chk->whoTo);
9645                                 chk->whoTo = asoc->primary_destination;
9646                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9647                         }
9648                         goto sctp_fill_in_rest;
9649                 }
9650         }
9651         /* Ok if we reach here we must build one */
9652         sctp_alloc_a_chunk(stcb, chk);
9653         if (chk == NULL) {
9654                 return;
9655         }
9656         chk->copy_by_ref = 0;
9657         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9658         chk->rec.chunk_id.can_take_data = 0;
9659         chk->asoc = asoc;
9660         chk->whoTo = NULL;
9661
9662         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9663         if (chk->data == NULL) {
9664                 sctp_free_a_chunk(stcb, chk);
9665                 return;
9666         }
9667         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9668         chk->sent = SCTP_DATAGRAM_UNSENT;
9669         chk->snd_count = 0;
9670         chk->whoTo = asoc->primary_destination;
9671         atomic_add_int(&chk->whoTo->ref_count, 1);
9672         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9673         asoc->ctrl_queue_cnt++;
9674 sctp_fill_in_rest:
9675         /*-
9676          * Here we go through and fill out the part that deals with
9677          * stream/seq of the ones we skip.
9678          */
9679         SCTP_BUF_LEN(chk->data) = 0;
9680         {
9681                 struct sctp_tmit_chunk *at, *tp1, *last;
9682                 struct sctp_strseq *strseq;
9683                 unsigned int cnt_of_space, i, ovh;
9684                 unsigned int space_needed;
9685                 unsigned int cnt_of_skipped = 0;
9686
9687                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9688                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9689                                 /* no more to look at */
9690                                 break;
9691                         }
9692                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9693                                 /* We don't report these */
9694                                 continue;
9695                         }
9696                         cnt_of_skipped++;
9697                 }
9698                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9699                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9700
9701                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9702
9703                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9704                         ovh = SCTP_MIN_OVERHEAD;
9705                 } else {
9706                         ovh = SCTP_MIN_V4_OVERHEAD;
9707                 }
9708                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9709                         /* trim to a mtu size */
9710                         cnt_of_space = asoc->smallest_mtu - ovh;
9711                 }
9712                 if (cnt_of_space < space_needed) {
9713                         /*-
9714                          * ok we must trim down the chunk by lowering the
9715                          * advance peer ack point.
9716                          */
9717                         cnt_of_skipped = (cnt_of_space -
9718                             ((sizeof(struct sctp_forward_tsn_chunk)) /
9719                             sizeof(struct sctp_strseq)));
9720                         /*-
9721                          * Go through and find the TSN that will be the one
9722                          * we report.
9723                          */
9724                         at = TAILQ_FIRST(&asoc->sent_queue);
9725                         for (i = 0; i < cnt_of_skipped; i++) {
9726                                 tp1 = TAILQ_NEXT(at, sctp_next);
9727                                 at = tp1;
9728                         }
9729                         last = at;
9730                         /*-
9731                          * last now points to last one I can report, update
9732                          * peer ack point
9733                          */
9734                         asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
9735                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
9736                 }
9737                 chk->send_size = space_needed;
9738                 /* Setup the chunk */
9739                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9740                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9741                 fwdtsn->ch.chunk_flags = 0;
9742                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9743                 fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
9744                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
9745                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9746                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9747                 fwdtsn++;
9748                 /*-
9749                  * Move pointer to after the fwdtsn and transfer to the
9750                  * strseq pointer.
9751                  */
9752                 strseq = (struct sctp_strseq *)fwdtsn;
9753                 /*-
9754                  * Now populate the strseq list. This is done blindly
9755                  * without pulling out duplicate stream info. This is
9756                  * inefficent but won't harm the process since the peer will
9757                  * look at these in sequence and will thus release anything.
9758                  * It could mean we exceed the PMTU and chop off some that
9759                  * we could have included.. but this is unlikely (aka 1432/4
9760                  * would mean 300+ stream seq's would have to be reported in
9761                  * one FWD-TSN. With a bit of work we can later FIX this to
9762                  * optimize and pull out duplcates.. but it does add more
9763                  * overhead. So for now... not!
9764                  */
9765                 at = TAILQ_FIRST(&asoc->sent_queue);
9766                 for (i = 0; i < cnt_of_skipped; i++) {
9767                         tp1 = TAILQ_NEXT(at, sctp_next);
9768                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9769                                 /* We don't report these */
9770                                 i--;
9771                                 at = tp1;
9772                                 continue;
9773                         }
9774                         strseq->stream = ntohs(at->rec.data.stream_number);
9775                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9776                         strseq++;
9777                         at = tp1;
9778                 }
9779         }
9780         return;
9781
9782 }
9783
9784 void
9785 sctp_send_sack(struct sctp_tcb *stcb)
9786 {
9787         /*-
9788          * Queue up a SACK in the control queue. We must first check to see
9789          * if a SACK is somehow on the control queue. If so, we will take
9790          * and and remove the old one.
9791          */
9792         struct sctp_association *asoc;
9793         struct sctp_tmit_chunk *chk, *a_chk;
9794         struct sctp_sack_chunk *sack;
9795         struct sctp_gap_ack_block *gap_descriptor;
9796         struct sack_track *selector;
9797         int mergeable = 0;
9798         int offset;
9799         caddr_t limit;
9800         uint32_t *dup;
9801         int limit_reached = 0;
9802         unsigned int i, jstart, siz, j;
9803         unsigned int num_gap_blocks = 0, space;
9804         int num_dups = 0;
9805         int space_req;
9806
9807         a_chk = NULL;
9808         asoc = &stcb->asoc;
9809         SCTP_TCB_LOCK_ASSERT(stcb);
9810         if (asoc->last_data_chunk_from == NULL) {
9811                 /* Hmm we never received anything */
9812                 return;
9813         }
9814         sctp_set_rwnd(stcb, asoc);
9815         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9816                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
9817                         /* Hmm, found a sack already on queue, remove it */
9818                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9819                         asoc->ctrl_queue_cnt++;
9820                         a_chk = chk;
9821                         if (a_chk->data) {
9822                                 sctp_m_freem(a_chk->data);
9823                                 a_chk->data = NULL;
9824                         }
9825                         sctp_free_remote_addr(a_chk->whoTo);
9826                         a_chk->whoTo = NULL;
9827                         break;
9828                 }
9829         }
9830         if (a_chk == NULL) {
9831                 sctp_alloc_a_chunk(stcb, a_chk);
9832                 if (a_chk == NULL) {
9833                         /* No memory so we drop the idea, and set a timer */
9834                         if (stcb->asoc.delayed_ack) {
9835                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9836                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9837                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9838                                     stcb->sctp_ep, stcb, NULL);
9839                         } else {
9840                                 stcb->asoc.send_sack = 1;
9841                         }
9842                         return;
9843                 }
9844                 a_chk->copy_by_ref = 0;
9845                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
9846                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
9847                 a_chk->rec.chunk_id.can_take_data = 1;
9848         }
9849         /* Clear our pkt counts */
9850         asoc->data_pkts_seen = 0;
9851
9852         a_chk->asoc = asoc;
9853         a_chk->snd_count = 0;
9854         a_chk->send_size = 0;   /* fill in later */
9855         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9856         a_chk->whoTo = NULL;
9857
9858         if ((asoc->numduptsns) ||
9859             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
9860             ) {
9861                 /*-
9862                  * Ok, we have some duplicates or the destination for the
9863                  * sack is unreachable, lets see if we can select an
9864                  * alternate than asoc->last_data_chunk_from
9865                  */
9866                 if ((!(asoc->last_data_chunk_from->dest_state &
9867                     SCTP_ADDR_NOT_REACHABLE)) &&
9868                     (asoc->used_alt_onsack > asoc->numnets)) {
9869                         /* We used an alt last time, don't this time */
9870                         a_chk->whoTo = NULL;
9871                 } else {
9872                         asoc->used_alt_onsack++;
9873                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9874                 }
9875                 if (a_chk->whoTo == NULL) {
9876                         /* Nope, no alternate */
9877                         a_chk->whoTo = asoc->last_data_chunk_from;
9878                         asoc->used_alt_onsack = 0;
9879                 }
9880         } else {
9881                 /*
9882                  * No duplicates so we use the last place we received data
9883                  * from.
9884                  */
9885                 asoc->used_alt_onsack = 0;
9886                 a_chk->whoTo = asoc->last_data_chunk_from;
9887         }
9888         if (a_chk->whoTo) {
9889                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9890         }
9891         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
9892                 /* no gaps */
9893                 space_req = sizeof(struct sctp_sack_chunk);
9894         } else {
9895                 /* gaps get a cluster */
9896                 space_req = MCLBYTES;
9897         }
9898         /* Ok now lets formulate a MBUF with our sack */
9899         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9900         if ((a_chk->data == NULL) ||
9901             (a_chk->whoTo == NULL)) {
9902                 /* rats, no mbuf memory */
9903                 if (a_chk->data) {
9904                         /* was a problem with the destination */
9905                         sctp_m_freem(a_chk->data);
9906                         a_chk->data = NULL;
9907                 }
9908                 sctp_free_a_chunk(stcb, a_chk);
9909                 /* sa_ignore NO_NULL_CHK */
9910                 if (stcb->asoc.delayed_ack) {
9911                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9912                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
9913                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9914                             stcb->sctp_ep, stcb, NULL);
9915                 } else {
9916                         stcb->asoc.send_sack = 1;
9917                 }
9918                 return;
9919         }
9920         /* ok, lets go through and fill it in */
9921         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
9922         space = M_TRAILINGSPACE(a_chk->data);
9923         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
9924                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
9925         }
9926         limit = mtod(a_chk->data, caddr_t);
9927         limit += space;
9928
9929         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
9930         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
9931         /* 0x01 is used by nonce for ecn */
9932         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
9933             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
9934             (asoc->peer_supports_ecn_nonce))
9935                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
9936         else
9937                 sack->ch.chunk_flags = 0;
9938
9939         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
9940                 /*-
9941                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
9942                  * received, then set high bit to 1, else 0. Reset
9943                  * pkts_rcvd.
9944                  */
9945                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
9946                 asoc->cmt_dac_pkts_rcvd = 0;
9947         }
9948 #ifdef SCTP_ASOCLOG_OF_TSNS
9949         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
9950         stcb->asoc.cumack_log_atsnt++;
9951         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
9952                 stcb->asoc.cumack_log_atsnt = 0;
9953         }
9954 #endif
9955         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
9956         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
9957         asoc->my_last_reported_rwnd = asoc->my_rwnd;
9958
9959         /* reset the readers interpretation */
9960         stcb->freed_by_sorcv_sincelast = 0;
9961
9962         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
9963
9964         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
9965         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
9966                 offset = 1;
9967                 /*-
9968                  * cum-ack behind the mapping array, so we start and use all
9969                  * entries.
9970                  */
9971                 jstart = 0;
9972         } else {
9973                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
9974                 /*-
9975                  * we skip the first one when the cum-ack is at or above the
9976                  * mapping array base. Note this only works if
9977                  */
9978                 jstart = 1;
9979         }
9980         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
9981                 /* we have a gap .. maybe */
9982                 for (i = 0; i < siz; i++) {
9983                         selector = &sack_array[asoc->mapping_array[i]];
9984                         if (mergeable && selector->right_edge) {
9985                                 /*
9986                                  * Backup, left and right edges were ok to
9987                                  * merge.
9988                                  */
9989                                 num_gap_blocks--;
9990                                 gap_descriptor--;
9991                         }
9992                         if (selector->num_entries == 0)
9993                                 mergeable = 0;
9994                         else {
9995                                 for (j = jstart; j < selector->num_entries; j++) {
9996                                         if (mergeable && selector->right_edge) {
9997                                                 /*
9998                                                  * do a merge by NOT setting
9999                                                  * the left side
10000                                                  */
10001                                                 mergeable = 0;
10002                                         } else {
10003                                                 /*
10004                                                  * no merge, set the left
10005                                                  * side
10006                                                  */
10007                                                 mergeable = 0;
10008                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10009                                         }
10010                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10011                                         num_gap_blocks++;
10012                                         gap_descriptor++;
10013                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10014                                                 /* no more room */
10015                                                 limit_reached = 1;
10016                                                 break;
10017                                         }
10018                                 }
10019                                 if (selector->left_edge) {
10020                                         mergeable = 1;
10021                                 }
10022                         }
10023                         if (limit_reached) {
10024                                 /* Reached the limit stop */
10025                                 break;
10026                         }
10027                         jstart = 0;
10028                         offset += 8;
10029                 }
10030                 if (num_gap_blocks == 0) {
10031                         /*
10032                          * slide not yet happened, and somehow we got called
10033                          * to send a sack. Cumack needs to move up.
10034                          */
10035                         int abort_flag = 0;
10036
10037                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
10038                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10039                         sctp_sack_check(stcb, 0, 0, &abort_flag);
10040                 }
10041         }
10042         /* now we must add any dups we are going to report. */
10043         if ((limit_reached == 0) && (asoc->numduptsns)) {
10044                 dup = (uint32_t *) gap_descriptor;
10045                 for (i = 0; i < asoc->numduptsns; i++) {
10046                         *dup = htonl(asoc->dup_tsns[i]);
10047                         dup++;
10048                         num_dups++;
10049                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10050                                 /* no more room */
10051                                 break;
10052                         }
10053                 }
10054                 asoc->numduptsns = 0;
10055         }
10056         /*
10057          * now that the chunk is prepared queue it to the control chunk
10058          * queue.
10059          */
10060         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
10061             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
10062             (num_dups * sizeof(int32_t)));
10063         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10064         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10065         sack->sack.num_dup_tsns = htons(num_dups);
10066         sack->ch.chunk_length = htons(a_chk->send_size);
10067         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10068         asoc->ctrl_queue_cnt++;
10069         asoc->send_sack = 0;
10070         SCTP_STAT_INCR(sctps_sendsacks);
10071         return;
10072 }
10073
10074
10075 void
10076 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10077 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10078     SCTP_UNUSED
10079 #endif
10080 )
10081 {
10082         struct mbuf *m_abort;
10083         struct mbuf *m_out = NULL, *m_end = NULL;
10084         struct sctp_abort_chunk *abort = NULL;
10085         int sz;
10086         uint32_t auth_offset = 0;
10087         struct sctp_auth_chunk *auth = NULL;
10088         struct sctphdr *shdr;
10089
10090         /*-
10091          * Add an AUTH chunk, if chunk requires it and save the offset into
10092          * the chain for AUTH
10093          */
10094         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10095             stcb->asoc.peer_auth_chunks)) {
10096                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10097                     stcb, SCTP_ABORT_ASSOCIATION);
10098         }
10099         SCTP_TCB_LOCK_ASSERT(stcb);
10100         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10101         if (m_abort == NULL) {
10102                 /* no mbuf's */
10103                 if (m_out)
10104                         sctp_m_freem(m_out);
10105                 return;
10106         }
10107         /* link in any error */
10108         SCTP_BUF_NEXT(m_abort) = operr;
10109         sz = 0;
10110         if (operr) {
10111                 struct mbuf *n;
10112
10113                 n = operr;
10114                 while (n) {
10115                         sz += SCTP_BUF_LEN(n);
10116                         n = SCTP_BUF_NEXT(n);
10117                 }
10118         }
10119         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10120         if (m_out == NULL) {
10121                 /* NO Auth chunk prepended, so reserve space in front */
10122                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10123                 m_out = m_abort;
10124         } else {
10125                 /* Put AUTH chunk at the front of the chain */
10126                 SCTP_BUF_NEXT(m_end) = m_abort;
10127         }
10128
10129         /* fill in the ABORT chunk */
10130         abort = mtod(m_abort, struct sctp_abort_chunk *);
10131         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10132         abort->ch.chunk_flags = 0;
10133         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10134
10135         /* prepend and fill in the SCTP header */
10136         SCTP_BUF_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
10137         if (m_out == NULL) {
10138                 /* TSNH: no memory */
10139                 return;
10140         }
10141         shdr = mtod(m_out, struct sctphdr *);
10142         shdr->src_port = stcb->sctp_ep->sctp_lport;
10143         shdr->dest_port = stcb->rport;
10144         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
10145         shdr->checksum = 0;
10146         auth_offset += sizeof(struct sctphdr);
10147
10148         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10149             stcb->asoc.primary_destination,
10150             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10151             m_out, auth_offset, auth, 1, 0, NULL, 0, stcb->asoc.primary_destination->port, so_locked, NULL);
10152         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10153 }
10154
10155 void
10156 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10157     struct sctp_nets *net)
10158 {
10159         /* formulate and SEND a SHUTDOWN-COMPLETE */
10160         struct mbuf *m_shutdown_comp;
10161         struct sctp_shutdown_complete_msg *comp_cp;
10162
10163         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 0, M_DONTWAIT, 1, MT_HEADER);
10164         if (m_shutdown_comp == NULL) {
10165                 /* no mbuf's */
10166                 return;
10167         }
10168         comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
10169         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10170         comp_cp->shut_cmp.ch.chunk_flags = 0;
10171         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10172         comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
10173         comp_cp->sh.dest_port = stcb->rport;
10174         comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
10175         comp_cp->sh.checksum = 0;
10176
10177         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
10178         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10179             (struct sockaddr *)&net->ro._l_addr,
10180             m_shutdown_comp, 0, NULL, 1, 0, NULL, 0, net->port, SCTP_SO_NOT_LOCKED, NULL);
10181         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10182         return;
10183 }
10184
10185 void
10186 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10187     uint32_t vrf_id, uint16_t port)
10188 {
10189         /* formulate and SEND a SHUTDOWN-COMPLETE */
10190         struct mbuf *o_pak;
10191         struct mbuf *mout;
10192         struct ip *iph, *iph_out;
10193         struct udphdr *udp = NULL;
10194
10195 #ifdef INET6
10196         struct ip6_hdr *ip6, *ip6_out;
10197
10198 #endif
10199         int offset_out, len, mlen;
10200         struct sctp_shutdown_complete_msg *comp_cp;
10201
10202         iph = mtod(m, struct ip *);
10203         switch (iph->ip_v) {
10204         case IPVERSION:
10205                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10206                 break;
10207 #ifdef INET6
10208         case IPV6_VERSION >> 4:
10209                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10210                 break;
10211 #endif
10212         default:
10213                 return;
10214         }
10215         if (port) {
10216                 len += sizeof(struct udphdr);
10217         }
10218         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
10219         if (mout == NULL) {
10220                 return;
10221         }
10222         SCTP_BUF_LEN(mout) = len;
10223         SCTP_BUF_NEXT(mout) = NULL;
10224         iph_out = NULL;
10225 #ifdef INET6
10226         ip6_out = NULL;
10227 #endif
10228         offset_out = 0;
10229
10230         switch (iph->ip_v) {
10231         case IPVERSION:
10232                 iph_out = mtod(mout, struct ip *);
10233
10234                 /* Fill in the IP header for the ABORT */
10235                 iph_out->ip_v = IPVERSION;
10236                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10237                 iph_out->ip_tos = (u_char)0;
10238                 iph_out->ip_id = 0;
10239                 iph_out->ip_off = 0;
10240                 iph_out->ip_ttl = MAXTTL;
10241                 if (port) {
10242                         iph_out->ip_p = IPPROTO_UDP;
10243                 } else {
10244                         iph_out->ip_p = IPPROTO_SCTP;
10245                 }
10246                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10247                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10248
10249                 /* let IP layer calculate this */
10250                 iph_out->ip_sum = 0;
10251                 offset_out += sizeof(*iph_out);
10252                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10253                     (caddr_t)iph_out + offset_out);
10254                 break;
10255 #ifdef INET6
10256         case IPV6_VERSION >> 4:
10257                 ip6 = (struct ip6_hdr *)iph;
10258                 ip6_out = mtod(mout, struct ip6_hdr *);
10259
10260                 /* Fill in the IPv6 header for the ABORT */
10261                 ip6_out->ip6_flow = ip6->ip6_flow;
10262                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
10263                 if (port) {
10264                         ip6_out->ip6_nxt = IPPROTO_UDP;
10265                 } else {
10266                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10267                 }
10268                 ip6_out->ip6_src = ip6->ip6_dst;
10269                 ip6_out->ip6_dst = ip6->ip6_src;
10270                 /*
10271                  * ?? The old code had both the iph len + payload, I think
10272                  * this is wrong and would never have worked
10273                  */
10274                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10275                 offset_out += sizeof(*ip6_out);
10276                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10277                     (caddr_t)ip6_out + offset_out);
10278                 break;
10279 #endif                          /* INET6 */
10280         default:
10281                 /* Currently not supported. */
10282                 return;
10283         }
10284         if (port) {
10285                 udp = (struct udphdr *)comp_cp;
10286                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10287                 udp->uh_dport = port;
10288                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10289                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10290                 offset_out += sizeof(struct udphdr);
10291                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10292         }
10293         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10294                 /* no mbuf's */
10295                 sctp_m_freem(mout);
10296                 return;
10297         }
10298         /* Now copy in and fill in the ABORT tags etc. */
10299         comp_cp->sh.src_port = sh->dest_port;
10300         comp_cp->sh.dest_port = sh->src_port;
10301         comp_cp->sh.checksum = 0;
10302         comp_cp->sh.v_tag = sh->v_tag;
10303         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10304         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10305         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10306
10307         /* add checksum */
10308         comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
10309         if (iph_out != NULL) {
10310                 sctp_route_t ro;
10311                 int ret;
10312                 struct sctp_tcb *stcb = NULL;
10313
10314                 mlen = SCTP_BUF_LEN(mout);
10315                 bzero(&ro, sizeof ro);
10316                 /* set IPv4 length */
10317                 iph_out->ip_len = mlen;
10318 #ifdef  SCTP_PACKET_LOGGING
10319                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10320                         sctp_packet_log(mout, mlen);
10321 #endif
10322                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10323                 if (port) {
10324                         SCTP_ENABLE_UDP_CSUM(o_pak);
10325                 }
10326                 /* out it goes */
10327                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10328
10329                 /* Free the route if we got one back */
10330                 if (ro.ro_rt)
10331                         RTFREE(ro.ro_rt);
10332         }
10333 #ifdef INET6
10334         if (ip6_out != NULL) {
10335                 struct route_in6 ro;
10336                 int ret;
10337                 struct sctp_tcb *stcb = NULL;
10338                 struct ifnet *ifp = NULL;
10339
10340                 bzero(&ro, sizeof(ro));
10341                 mlen = SCTP_BUF_LEN(mout);
10342 #ifdef  SCTP_PACKET_LOGGING
10343                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10344                         sctp_packet_log(mout, mlen);
10345 #endif
10346                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10347                 if (port) {
10348                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr),
10349                             sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr))) == 0) {
10350                                 udp->uh_sum = 0xffff;
10351                         }
10352                 }
10353                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10354
10355                 /* Free the route if we got one back */
10356                 if (ro.ro_rt)
10357                         RTFREE(ro.ro_rt);
10358         }
10359 #endif
10360         SCTP_STAT_INCR(sctps_sendpackets);
10361         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10362         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10363         return;
10364
10365 }
10366
10367 static struct sctp_nets *
10368 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10369 {
10370         struct sctp_nets *net, *hnet;
10371         int ms_goneby, highest_ms, state_overide = 0;
10372
10373         (void)SCTP_GETTIME_TIMEVAL(now);
10374         highest_ms = 0;
10375         hnet = NULL;
10376         SCTP_TCB_LOCK_ASSERT(stcb);
10377         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10378                 if (
10379                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10380                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10381                     ) {
10382                         /*
10383                          * Skip this guy from consideration if HB is off AND
10384                          * its confirmed
10385                          */
10386                         continue;
10387                 }
10388                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10389                         /* skip this dest net from consideration */
10390                         continue;
10391                 }
10392                 if (net->last_sent_time.tv_sec) {
10393                         /* Sent to so we subtract */
10394                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10395                 } else
10396                         /* Never been sent to */
10397                         ms_goneby = 0x7fffffff;
10398                 /*-
10399                  * When the address state is unconfirmed but still
10400                  * considered reachable, we HB at a higher rate. Once it
10401                  * goes confirmed OR reaches the "unreachable" state, thenw
10402                  * we cut it back to HB at a more normal pace.
10403                  */
10404                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10405                         state_overide = 1;
10406                 } else {
10407                         state_overide = 0;
10408                 }
10409
10410                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10411                     (ms_goneby > highest_ms)) {
10412                         highest_ms = ms_goneby;
10413                         hnet = net;
10414                 }
10415         }
10416         if (hnet &&
10417             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10418                 state_overide = 1;
10419         } else {
10420                 state_overide = 0;
10421         }
10422
10423         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10424                 /*-
10425                  * Found the one with longest delay bounds OR it is
10426                  * unconfirmed and still not marked unreachable.
10427                  */
10428                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10429 #ifdef SCTP_DEBUG
10430                 if (hnet) {
10431                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10432                             (struct sockaddr *)&hnet->ro._l_addr);
10433                 } else {
10434                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10435                 }
10436 #endif
10437                 /* update the timer now */
10438                 hnet->last_sent_time = *now;
10439                 return (hnet);
10440         }
10441         /* Nothing to HB */
10442         return (NULL);
10443 }
10444
10445 int
10446 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10447 {
10448         struct sctp_tmit_chunk *chk;
10449         struct sctp_nets *net;
10450         struct sctp_heartbeat_chunk *hb;
10451         struct timeval now;
10452         struct sockaddr_in *sin;
10453         struct sockaddr_in6 *sin6;
10454
10455         SCTP_TCB_LOCK_ASSERT(stcb);
10456         if (user_req == 0) {
10457                 net = sctp_select_hb_destination(stcb, &now);
10458                 if (net == NULL) {
10459                         /*-
10460                          * All our busy none to send to, just start the
10461                          * timer again.
10462                          */
10463                         if (stcb->asoc.state == 0) {
10464                                 return (0);
10465                         }
10466                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10467                             stcb->sctp_ep,
10468                             stcb,
10469                             net);
10470                         return (0);
10471                 }
10472         } else {
10473                 net = u_net;
10474                 if (net == NULL) {
10475                         return (0);
10476                 }
10477                 (void)SCTP_GETTIME_TIMEVAL(&now);
10478         }
10479         sin = (struct sockaddr_in *)&net->ro._l_addr;
10480         if (sin->sin_family != AF_INET) {
10481                 if (sin->sin_family != AF_INET6) {
10482                         /* huh */
10483                         return (0);
10484                 }
10485         }
10486         sctp_alloc_a_chunk(stcb, chk);
10487         if (chk == NULL) {
10488                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10489                 return (0);
10490         }
10491         chk->copy_by_ref = 0;
10492         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10493         chk->rec.chunk_id.can_take_data = 1;
10494         chk->asoc = &stcb->asoc;
10495         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10496
10497         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10498         if (chk->data == NULL) {
10499                 sctp_free_a_chunk(stcb, chk);
10500                 return (0);
10501         }
10502         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10503         SCTP_BUF_LEN(chk->data) = chk->send_size;
10504         chk->sent = SCTP_DATAGRAM_UNSENT;
10505         chk->snd_count = 0;
10506         chk->whoTo = net;
10507         atomic_add_int(&chk->whoTo->ref_count, 1);
10508         /* Now we have a mbuf that we can fill in with the details */
10509         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10510         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10511         /* fill out chunk header */
10512         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10513         hb->ch.chunk_flags = 0;
10514         hb->ch.chunk_length = htons(chk->send_size);
10515         /* Fill out hb parameter */
10516         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10517         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10518         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10519         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10520         /* Did our user request this one, put it in */
10521         hb->heartbeat.hb_info.user_req = user_req;
10522         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10523         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10524         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10525                 /*
10526                  * we only take from the entropy pool if the address is not
10527                  * confirmed.
10528                  */
10529                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10530                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10531         } else {
10532                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10533                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10534         }
10535         if (sin->sin_family == AF_INET) {
10536                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10537         } else if (sin->sin_family == AF_INET6) {
10538                 /* We leave the scope the way it is in our lookup table. */
10539                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10540                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10541         } else {
10542                 /* huh compiler bug */
10543                 return (0);
10544         }
10545
10546         /*
10547          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10548          * PF-heartbeats.  Because of this, threshold management is done by
10549          * the t3 timer handler, and does not need to be done upon the send
10550          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10551          * heartbeat is being sent is in PF state, do NOT do threshold
10552          * management.
10553          */
10554         if ((SCTP_BASE_SYSCTL(sctp_cmt_pf) == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10555                 /* ok we have a destination that needs a beat */
10556                 /* lets do the theshold management Qiaobing style */
10557                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10558                     stcb->asoc.max_send_times)) {
10559                         /*-
10560                          * we have lost the association, in a way this is
10561                          * quite bad since we really are one less time since
10562                          * we really did not send yet. This is the down side
10563                          * to the Q's style as defined in the RFC and not my
10564                          * alternate style defined in the RFC.
10565                          */
10566                         if (chk->data != NULL) {
10567                                 sctp_m_freem(chk->data);
10568                                 chk->data = NULL;
10569                         }
10570                         /*
10571                          * Here we do NOT use the macro since the
10572                          * association is now gone.
10573                          */
10574                         if (chk->whoTo) {
10575                                 sctp_free_remote_addr(chk->whoTo);
10576                                 chk->whoTo = NULL;
10577                         }
10578                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10579                         return (-1);
10580                 }
10581         }
10582         net->hb_responded = 0;
10583         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10584         stcb->asoc.ctrl_queue_cnt++;
10585         SCTP_STAT_INCR(sctps_sendheartbeat);
10586         /*-
10587          * Call directly med level routine to put out the chunk. It will
10588          * always tumble out control chunks aka HB but it may even tumble
10589          * out data too.
10590          */
10591         return (1);
10592 }
10593
10594 void
10595 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10596     uint32_t high_tsn)
10597 {
10598         struct sctp_association *asoc;
10599         struct sctp_ecne_chunk *ecne;
10600         struct sctp_tmit_chunk *chk;
10601
10602         asoc = &stcb->asoc;
10603         SCTP_TCB_LOCK_ASSERT(stcb);
10604         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10605                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
10606                         /* found a previous ECN_ECHO update it if needed */
10607                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10608                         ecne->tsn = htonl(high_tsn);
10609                         return;
10610                 }
10611         }
10612         /* nope could not find one to update so we must build one */
10613         sctp_alloc_a_chunk(stcb, chk);
10614         if (chk == NULL) {
10615                 return;
10616         }
10617         chk->copy_by_ref = 0;
10618         SCTP_STAT_INCR(sctps_sendecne);
10619         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10620         chk->rec.chunk_id.can_take_data = 0;
10621         chk->asoc = &stcb->asoc;
10622         chk->send_size = sizeof(struct sctp_ecne_chunk);
10623         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10624         if (chk->data == NULL) {
10625                 sctp_free_a_chunk(stcb, chk);
10626                 return;
10627         }
10628         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10629         SCTP_BUF_LEN(chk->data) = chk->send_size;
10630         chk->sent = SCTP_DATAGRAM_UNSENT;
10631         chk->snd_count = 0;
10632         chk->whoTo = net;
10633         atomic_add_int(&chk->whoTo->ref_count, 1);
10634         stcb->asoc.ecn_echo_cnt_onq++;
10635         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10636         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10637         ecne->ch.chunk_flags = 0;
10638         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10639         ecne->tsn = htonl(high_tsn);
10640         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10641         asoc->ctrl_queue_cnt++;
10642 }
10643
10644 void
10645 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10646     struct mbuf *m, int iphlen, int bad_crc)
10647 {
10648         struct sctp_association *asoc;
10649         struct sctp_pktdrop_chunk *drp;
10650         struct sctp_tmit_chunk *chk;
10651         uint8_t *datap;
10652         int len;
10653         int was_trunc = 0;
10654         struct ip *iph;
10655
10656 #ifdef INET6
10657         struct ip6_hdr *ip6h;
10658
10659 #endif
10660         int fullsz = 0, extra = 0;
10661         long spc;
10662         int offset;
10663         struct sctp_chunkhdr *ch, chunk_buf;
10664         unsigned int chk_length;
10665
10666         if (!stcb) {
10667                 return;
10668         }
10669         asoc = &stcb->asoc;
10670         SCTP_TCB_LOCK_ASSERT(stcb);
10671         if (asoc->peer_supports_pktdrop == 0) {
10672                 /*-
10673                  * peer must declare support before I send one.
10674                  */
10675                 return;
10676         }
10677         if (stcb->sctp_socket == NULL) {
10678                 return;
10679         }
10680         sctp_alloc_a_chunk(stcb, chk);
10681         if (chk == NULL) {
10682                 return;
10683         }
10684         chk->copy_by_ref = 0;
10685         iph = mtod(m, struct ip *);
10686         if (iph == NULL) {
10687                 sctp_free_a_chunk(stcb, chk);
10688                 return;
10689         }
10690         switch (iph->ip_v) {
10691         case IPVERSION:
10692                 /* IPv4 */
10693                 len = chk->send_size = iph->ip_len;
10694                 break;
10695 #ifdef INET6
10696         case IPV6_VERSION >> 4:
10697                 /* IPv6 */
10698                 ip6h = mtod(m, struct ip6_hdr *);
10699                 len = chk->send_size = htons(ip6h->ip6_plen);
10700                 break;
10701 #endif
10702         default:
10703                 return;
10704         }
10705         /* Validate that we do not have an ABORT in here. */
10706         offset = iphlen + sizeof(struct sctphdr);
10707         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10708             sizeof(*ch), (uint8_t *) & chunk_buf);
10709         while (ch != NULL) {
10710                 chk_length = ntohs(ch->chunk_length);
10711                 if (chk_length < sizeof(*ch)) {
10712                         /* break to abort land */
10713                         break;
10714                 }
10715                 switch (ch->chunk_type) {
10716                 case SCTP_PACKET_DROPPED:
10717                 case SCTP_ABORT_ASSOCIATION:
10718                         /*-
10719                          * we don't respond with an PKT-DROP to an ABORT
10720                          * or PKT-DROP
10721                          */
10722                         sctp_free_a_chunk(stcb, chk);
10723                         return;
10724                 default:
10725                         break;
10726                 }
10727                 offset += SCTP_SIZE32(chk_length);
10728                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10729                     sizeof(*ch), (uint8_t *) & chunk_buf);
10730         }
10731
10732         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10733             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10734                 /*
10735                  * only send 1 mtu worth, trim off the excess on the end.
10736                  */
10737                 fullsz = len - extra;
10738                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10739                 was_trunc = 1;
10740         }
10741         chk->asoc = &stcb->asoc;
10742         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10743         if (chk->data == NULL) {
10744 jump_out:
10745                 sctp_free_a_chunk(stcb, chk);
10746                 return;
10747         }
10748         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10749         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10750         if (drp == NULL) {
10751                 sctp_m_freem(chk->data);
10752                 chk->data = NULL;
10753                 goto jump_out;
10754         }
10755         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10756             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10757         chk->book_size_scale = 0;
10758         if (was_trunc) {
10759                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
10760                 drp->trunc_len = htons(fullsz);
10761                 /*
10762                  * Len is already adjusted to size minus overhead above take
10763                  * out the pkt_drop chunk itself from it.
10764                  */
10765                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
10766                 len = chk->send_size;
10767         } else {
10768                 /* no truncation needed */
10769                 drp->ch.chunk_flags = 0;
10770                 drp->trunc_len = htons(0);
10771         }
10772         if (bad_crc) {
10773                 drp->ch.chunk_flags |= SCTP_BADCRC;
10774         }
10775         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
10776         SCTP_BUF_LEN(chk->data) = chk->send_size;
10777         chk->sent = SCTP_DATAGRAM_UNSENT;
10778         chk->snd_count = 0;
10779         if (net) {
10780                 /* we should hit here */
10781                 chk->whoTo = net;
10782         } else {
10783                 chk->whoTo = asoc->primary_destination;
10784         }
10785         atomic_add_int(&chk->whoTo->ref_count, 1);
10786         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
10787         chk->rec.chunk_id.can_take_data = 1;
10788         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
10789         drp->ch.chunk_length = htons(chk->send_size);
10790         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
10791         if (spc < 0) {
10792                 spc = 0;
10793         }
10794         drp->bottle_bw = htonl(spc);
10795         if (asoc->my_rwnd) {
10796                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
10797                     asoc->size_on_all_streams +
10798                     asoc->my_rwnd_control_len +
10799                     stcb->sctp_socket->so_rcv.sb_cc);
10800         } else {
10801                 /*-
10802                  * If my rwnd is 0, possibly from mbuf depletion as well as
10803                  * space used, tell the peer there is NO space aka onq == bw
10804                  */
10805                 drp->current_onq = htonl(spc);
10806         }
10807         drp->reserved = 0;
10808         datap = drp->data;
10809         m_copydata(m, iphlen, len, (caddr_t)datap);
10810         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10811         asoc->ctrl_queue_cnt++;
10812 }
10813
10814 void
10815 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
10816 {
10817         struct sctp_association *asoc;
10818         struct sctp_cwr_chunk *cwr;
10819         struct sctp_tmit_chunk *chk;
10820
10821         asoc = &stcb->asoc;
10822         SCTP_TCB_LOCK_ASSERT(stcb);
10823         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10824                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
10825                         /* found a previous ECN_CWR update it if needed */
10826                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10827                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
10828                             MAX_TSN)) {
10829                                 cwr->tsn = htonl(high_tsn);
10830                         }
10831                         return;
10832                 }
10833         }
10834         /* nope could not find one to update so we must build one */
10835         sctp_alloc_a_chunk(stcb, chk);
10836         if (chk == NULL) {
10837                 return;
10838         }
10839         chk->copy_by_ref = 0;
10840         chk->rec.chunk_id.id = SCTP_ECN_CWR;
10841         chk->rec.chunk_id.can_take_data = 1;
10842         chk->asoc = &stcb->asoc;
10843         chk->send_size = sizeof(struct sctp_cwr_chunk);
10844         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10845         if (chk->data == NULL) {
10846                 sctp_free_a_chunk(stcb, chk);
10847                 return;
10848         }
10849         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10850         SCTP_BUF_LEN(chk->data) = chk->send_size;
10851         chk->sent = SCTP_DATAGRAM_UNSENT;
10852         chk->snd_count = 0;
10853         chk->whoTo = net;
10854         atomic_add_int(&chk->whoTo->ref_count, 1);
10855         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10856         cwr->ch.chunk_type = SCTP_ECN_CWR;
10857         cwr->ch.chunk_flags = 0;
10858         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
10859         cwr->tsn = htonl(high_tsn);
10860         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10861         asoc->ctrl_queue_cnt++;
10862 }
10863
10864 void
10865 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
10866     int number_entries, uint16_t * list,
10867     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
10868 {
10869         int len, old_len, i;
10870         struct sctp_stream_reset_out_request *req_out;
10871         struct sctp_chunkhdr *ch;
10872
10873         ch = mtod(chk->data, struct sctp_chunkhdr *);
10874
10875
10876         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10877
10878         /* get to new offset for the param. */
10879         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
10880         /* now how long will this param be? */
10881         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
10882         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
10883         req_out->ph.param_length = htons(len);
10884         req_out->request_seq = htonl(seq);
10885         req_out->response_seq = htonl(resp_seq);
10886         req_out->send_reset_at_tsn = htonl(last_sent);
10887         if (number_entries) {
10888                 for (i = 0; i < number_entries; i++) {
10889                         req_out->list_of_streams[i] = htons(list[i]);
10890                 }
10891         }
10892         if (SCTP_SIZE32(len) > len) {
10893                 /*-
10894                  * Need to worry about the pad we may end up adding to the
10895                  * end. This is easy since the struct is either aligned to 4
10896                  * bytes or 2 bytes off.
10897                  */
10898                 req_out->list_of_streams[number_entries] = 0;
10899         }
10900         /* now fix the chunk length */
10901         ch->chunk_length = htons(len + old_len);
10902         chk->book_size = len + old_len;
10903         chk->book_size_scale = 0;
10904         chk->send_size = SCTP_SIZE32(chk->book_size);
10905         SCTP_BUF_LEN(chk->data) = chk->send_size;
10906         return;
10907 }
10908
10909
10910 void
10911 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
10912     int number_entries, uint16_t * list,
10913     uint32_t seq)
10914 {
10915         int len, old_len, i;
10916         struct sctp_stream_reset_in_request *req_in;
10917         struct sctp_chunkhdr *ch;
10918
10919         ch = mtod(chk->data, struct sctp_chunkhdr *);
10920
10921
10922         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10923
10924         /* get to new offset for the param. */
10925         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
10926         /* now how long will this param be? */
10927         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
10928         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
10929         req_in->ph.param_length = htons(len);
10930         req_in->request_seq = htonl(seq);
10931         if (number_entries) {
10932                 for (i = 0; i < number_entries; i++) {
10933                         req_in->list_of_streams[i] = htons(list[i]);
10934                 }
10935         }
10936         if (SCTP_SIZE32(len) > len) {
10937                 /*-
10938                  * Need to worry about the pad we may end up adding to the
10939                  * end. This is easy since the struct is either aligned to 4
10940                  * bytes or 2 bytes off.
10941                  */
10942                 req_in->list_of_streams[number_entries] = 0;
10943         }
10944         /* now fix the chunk length */
10945         ch->chunk_length = htons(len + old_len);
10946         chk->book_size = len + old_len;
10947         chk->book_size_scale = 0;
10948         chk->send_size = SCTP_SIZE32(chk->book_size);
10949         SCTP_BUF_LEN(chk->data) = chk->send_size;
10950         return;
10951 }
10952
10953
10954 void
10955 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
10956     uint32_t seq)
10957 {
10958         int len, old_len;
10959         struct sctp_stream_reset_tsn_request *req_tsn;
10960         struct sctp_chunkhdr *ch;
10961
10962         ch = mtod(chk->data, struct sctp_chunkhdr *);
10963
10964
10965         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10966
10967         /* get to new offset for the param. */
10968         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
10969         /* now how long will this param be? */
10970         len = sizeof(struct sctp_stream_reset_tsn_request);
10971         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
10972         req_tsn->ph.param_length = htons(len);
10973         req_tsn->request_seq = htonl(seq);
10974
10975         /* now fix the chunk length */
10976         ch->chunk_length = htons(len + old_len);
10977         chk->send_size = len + old_len;
10978         chk->book_size = SCTP_SIZE32(chk->send_size);
10979         chk->book_size_scale = 0;
10980         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
10981         return;
10982 }
10983
10984 void
10985 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
10986     uint32_t resp_seq, uint32_t result)
10987 {
10988         int len, old_len;
10989         struct sctp_stream_reset_response *resp;
10990         struct sctp_chunkhdr *ch;
10991
10992         ch = mtod(chk->data, struct sctp_chunkhdr *);
10993
10994
10995         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10996
10997         /* get to new offset for the param. */
10998         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
10999         /* now how long will this param be? */
11000         len = sizeof(struct sctp_stream_reset_response);
11001         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11002         resp->ph.param_length = htons(len);
11003         resp->response_seq = htonl(resp_seq);
11004         resp->result = ntohl(result);
11005
11006         /* now fix the chunk length */
11007         ch->chunk_length = htons(len + old_len);
11008         chk->book_size = len + old_len;
11009         chk->book_size_scale = 0;
11010         chk->send_size = SCTP_SIZE32(chk->book_size);
11011         SCTP_BUF_LEN(chk->data) = chk->send_size;
11012         return;
11013
11014 }
11015
11016
11017 void
11018 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11019     uint32_t resp_seq, uint32_t result,
11020     uint32_t send_una, uint32_t recv_next)
11021 {
11022         int len, old_len;
11023         struct sctp_stream_reset_response_tsn *resp;
11024         struct sctp_chunkhdr *ch;
11025
11026         ch = mtod(chk->data, struct sctp_chunkhdr *);
11027
11028
11029         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11030
11031         /* get to new offset for the param. */
11032         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11033         /* now how long will this param be? */
11034         len = sizeof(struct sctp_stream_reset_response_tsn);
11035         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11036         resp->ph.param_length = htons(len);
11037         resp->response_seq = htonl(resp_seq);
11038         resp->result = htonl(result);
11039         resp->senders_next_tsn = htonl(send_una);
11040         resp->receivers_next_tsn = htonl(recv_next);
11041
11042         /* now fix the chunk length */
11043         ch->chunk_length = htons(len + old_len);
11044         chk->book_size = len + old_len;
11045         chk->send_size = SCTP_SIZE32(chk->book_size);
11046         chk->book_size_scale = 0;
11047         SCTP_BUF_LEN(chk->data) = chk->send_size;
11048         return;
11049 }
11050
11051
11052 int
11053 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11054     int number_entries, uint16_t * list,
11055     uint8_t send_out_req, uint32_t resp_seq,
11056     uint8_t send_in_req,
11057     uint8_t send_tsn_req)
11058 {
11059
11060         struct sctp_association *asoc;
11061         struct sctp_tmit_chunk *chk;
11062         struct sctp_chunkhdr *ch;
11063         uint32_t seq;
11064
11065         asoc = &stcb->asoc;
11066         if (asoc->stream_reset_outstanding) {
11067                 /*-
11068                  * Already one pending, must get ACK back to clear the flag.
11069                  */
11070                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11071                 return (EBUSY);
11072         }
11073         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
11074                 /* nothing to do */
11075                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11076                 return (EINVAL);
11077         }
11078         if (send_tsn_req && (send_out_req || send_in_req)) {
11079                 /* error, can't do that */
11080                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11081                 return (EINVAL);
11082         }
11083         sctp_alloc_a_chunk(stcb, chk);
11084         if (chk == NULL) {
11085                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11086                 return (ENOMEM);
11087         }
11088         chk->copy_by_ref = 0;
11089         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11090         chk->rec.chunk_id.can_take_data = 0;
11091         chk->asoc = &stcb->asoc;
11092         chk->book_size = sizeof(struct sctp_chunkhdr);
11093         chk->send_size = SCTP_SIZE32(chk->book_size);
11094         chk->book_size_scale = 0;
11095
11096         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11097         if (chk->data == NULL) {
11098                 sctp_free_a_chunk(stcb, chk);
11099                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11100                 return (ENOMEM);
11101         }
11102         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11103
11104         /* setup chunk parameters */
11105         chk->sent = SCTP_DATAGRAM_UNSENT;
11106         chk->snd_count = 0;
11107         chk->whoTo = asoc->primary_destination;
11108         atomic_add_int(&chk->whoTo->ref_count, 1);
11109
11110         ch = mtod(chk->data, struct sctp_chunkhdr *);
11111         ch->chunk_type = SCTP_STREAM_RESET;
11112         ch->chunk_flags = 0;
11113         ch->chunk_length = htons(chk->book_size);
11114         SCTP_BUF_LEN(chk->data) = chk->send_size;
11115
11116         seq = stcb->asoc.str_reset_seq_out;
11117         if (send_out_req) {
11118                 sctp_add_stream_reset_out(chk, number_entries, list,
11119                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11120                 asoc->stream_reset_out_is_outstanding = 1;
11121                 seq++;
11122                 asoc->stream_reset_outstanding++;
11123         }
11124         if (send_in_req) {
11125                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11126                 asoc->stream_reset_outstanding++;
11127         }
11128         if (send_tsn_req) {
11129                 sctp_add_stream_reset_tsn(chk, seq);
11130                 asoc->stream_reset_outstanding++;
11131         }
11132         asoc->str_reset = chk;
11133
11134         /* insert the chunk for sending */
11135         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11136             chk,
11137             sctp_next);
11138         asoc->ctrl_queue_cnt++;
11139         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11140         return (0);
11141 }
11142
11143 void
11144 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11145     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11146 {
11147         /*-
11148          * Formulate the abort message, and send it back down.
11149          */
11150         struct mbuf *o_pak;
11151         struct mbuf *mout;
11152         struct sctp_abort_msg *abm;
11153         struct ip *iph, *iph_out;
11154         struct udphdr *udp;
11155
11156 #ifdef INET6
11157         struct ip6_hdr *ip6, *ip6_out;
11158
11159 #endif
11160         int iphlen_out, len;
11161
11162         /* don't respond to ABORT with ABORT */
11163         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11164                 if (err_cause)
11165                         sctp_m_freem(err_cause);
11166                 return;
11167         }
11168         iph = mtod(m, struct ip *);
11169         switch (iph->ip_v) {
11170         case IPVERSION:
11171                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11172                 break;
11173 #ifdef INET6
11174         case IPV6_VERSION >> 4:
11175                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11176                 break;
11177 #endif
11178         default:
11179                 return;
11180         }
11181         if (port) {
11182                 len += sizeof(struct udphdr);
11183         }
11184         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
11185         if (mout == NULL) {
11186                 if (err_cause)
11187                         sctp_m_freem(err_cause);
11188                 return;
11189         }
11190         SCTP_BUF_LEN(mout) = len;
11191         SCTP_BUF_NEXT(mout) = err_cause;
11192         iph_out = NULL;
11193 #ifdef INET6
11194         ip6_out = NULL;
11195 #endif
11196         switch (iph->ip_v) {
11197         case IPVERSION:
11198                 iph_out = mtod(mout, struct ip *);
11199
11200                 /* Fill in the IP header for the ABORT */
11201                 iph_out->ip_v = IPVERSION;
11202                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11203                 iph_out->ip_tos = (u_char)0;
11204                 iph_out->ip_id = 0;
11205                 iph_out->ip_off = 0;
11206                 iph_out->ip_ttl = MAXTTL;
11207                 if (port) {
11208                         iph_out->ip_p = IPPROTO_UDP;
11209                 } else {
11210                         iph_out->ip_p = IPPROTO_SCTP;
11211                 }
11212                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11213                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11214                 /* let IP layer calculate this */
11215                 iph_out->ip_sum = 0;
11216
11217                 iphlen_out = sizeof(*iph_out);
11218                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11219                 break;
11220 #ifdef INET6
11221         case IPV6_VERSION >> 4:
11222                 ip6 = (struct ip6_hdr *)iph;
11223                 ip6_out = mtod(mout, struct ip6_hdr *);
11224
11225                 /* Fill in the IP6 header for the ABORT */
11226                 ip6_out->ip6_flow = ip6->ip6_flow;
11227                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
11228                 if (port) {
11229                         ip6_out->ip6_nxt = IPPROTO_UDP;
11230                 } else {
11231                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11232                 }
11233                 ip6_out->ip6_src = ip6->ip6_dst;
11234                 ip6_out->ip6_dst = ip6->ip6_src;
11235
11236                 iphlen_out = sizeof(*ip6_out);
11237                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11238                 break;
11239 #endif                          /* INET6 */
11240         default:
11241                 /* Currently not supported */
11242                 if (err_cause)
11243                         sctp_m_freem(err_cause);
11244                 sctp_m_freem(mout);
11245                 return;
11246         }
11247
11248         udp = (struct udphdr *)abm;
11249         if (port) {
11250                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11251                 udp->uh_dport = port;
11252                 /* set udp->uh_ulen later */
11253                 udp->uh_sum = 0;
11254                 iphlen_out += sizeof(struct udphdr);
11255                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11256         }
11257         abm->sh.src_port = sh->dest_port;
11258         abm->sh.dest_port = sh->src_port;
11259         abm->sh.checksum = 0;
11260         if (vtag == 0) {
11261                 abm->sh.v_tag = sh->v_tag;
11262                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11263         } else {
11264                 abm->sh.v_tag = htonl(vtag);
11265                 abm->msg.ch.chunk_flags = 0;
11266         }
11267         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11268
11269         if (err_cause) {
11270                 struct mbuf *m_tmp = err_cause;
11271                 int err_len = 0;
11272
11273                 /* get length of the err_cause chain */
11274                 while (m_tmp != NULL) {
11275                         err_len += SCTP_BUF_LEN(m_tmp);
11276                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11277                 }
11278                 len = SCTP_BUF_LEN(mout) + err_len;
11279                 if (err_len % 4) {
11280                         /* need pad at end of chunk */
11281                         uint32_t cpthis = 0;
11282                         int padlen;
11283
11284                         padlen = 4 - (len % 4);
11285                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11286                         len += padlen;
11287                 }
11288                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11289         } else {
11290                 len = SCTP_BUF_LEN(mout);
11291                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11292         }
11293
11294         /* add checksum */
11295         abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
11296         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11297                 /* no mbuf's */
11298                 sctp_m_freem(mout);
11299                 return;
11300         }
11301         if (iph_out != NULL) {
11302                 sctp_route_t ro;
11303                 struct sctp_tcb *stcb = NULL;
11304                 int ret;
11305
11306                 /* zap the stack pointer to the route */
11307                 bzero(&ro, sizeof ro);
11308                 if (port) {
11309                         udp->uh_ulen = htons(len - sizeof(struct ip));
11310                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11311                 }
11312                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11313                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11314                 /* set IPv4 length */
11315                 iph_out->ip_len = len;
11316                 /* out it goes */
11317 #ifdef  SCTP_PACKET_LOGGING
11318                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11319                         sctp_packet_log(mout, len);
11320 #endif
11321                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11322                 if (port) {
11323                         SCTP_ENABLE_UDP_CSUM(o_pak);
11324                 }
11325                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
11326
11327                 /* Free the route if we got one back */
11328                 if (ro.ro_rt)
11329                         RTFREE(ro.ro_rt);
11330         }
11331 #ifdef INET6
11332         if (ip6_out != NULL) {
11333                 struct route_in6 ro;
11334                 int ret;
11335                 struct sctp_tcb *stcb = NULL;
11336                 struct ifnet *ifp = NULL;
11337
11338                 /* zap the stack pointer to the route */
11339                 bzero(&ro, sizeof(ro));
11340                 if (port) {
11341                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11342                 }
11343                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11344                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11345                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11346 #ifdef  SCTP_PACKET_LOGGING
11347                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11348                         sctp_packet_log(mout, len);
11349 #endif
11350                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11351                 if (port) {
11352                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11353                                 udp->uh_sum = 0xffff;
11354                         }
11355                 }
11356                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11357
11358                 /* Free the route if we got one back */
11359                 if (ro.ro_rt)
11360                         RTFREE(ro.ro_rt);
11361         }
11362 #endif
11363         SCTP_STAT_INCR(sctps_sendpackets);
11364         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11365 }
11366
11367 void
11368 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11369     uint32_t vrf_id, uint16_t port)
11370 {
11371         struct mbuf *o_pak;
11372         struct sctphdr *ihdr;
11373         int retcode;
11374         struct sctphdr *ohdr;
11375         struct sctp_chunkhdr *ophdr;
11376         struct ip *iph;
11377         struct udphdr *udp = NULL;
11378         struct mbuf *mout;
11379
11380 #ifdef INET6
11381 #ifdef SCTP_DEBUG
11382         struct sockaddr_in6 lsa6, fsa6;
11383
11384 #endif
11385 #endif
11386         uint32_t val;
11387         struct mbuf *at;
11388         int len;
11389
11390         iph = mtod(m, struct ip *);
11391         ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
11392
11393         SCTP_BUF_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
11394         if (scm == NULL) {
11395                 /* can't send because we can't add a mbuf */
11396                 return;
11397         }
11398         ohdr = mtod(scm, struct sctphdr *);
11399         ohdr->src_port = ihdr->dest_port;
11400         ohdr->dest_port = ihdr->src_port;
11401         ohdr->v_tag = vtag;
11402         ohdr->checksum = 0;
11403         ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
11404         ophdr->chunk_type = SCTP_OPERATION_ERROR;
11405         ophdr->chunk_flags = 0;
11406         len = 0;
11407         at = scm;
11408         while (at) {
11409                 len += SCTP_BUF_LEN(at);
11410                 at = SCTP_BUF_NEXT(at);
11411         }
11412         ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
11413         if (len % 4) {
11414                 /* need padding */
11415                 uint32_t cpthis = 0;
11416                 int padlen;
11417
11418                 padlen = 4 - (len % 4);
11419                 m_copyback(scm, len, padlen, (caddr_t)&cpthis);
11420                 len += padlen;
11421         }
11422         val = sctp_calculate_sum(scm, NULL, 0);
11423 #ifdef INET6
11424         if (port) {
11425                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
11426         } else {
11427                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
11428         }
11429 #else
11430         if (port) {
11431                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
11432         } else {
11433                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
11434         }
11435 #endif
11436         if (mout == NULL) {
11437                 sctp_m_freem(scm);
11438                 return;
11439         }
11440         SCTP_BUF_NEXT(mout) = scm;
11441         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11442                 sctp_m_freem(mout);
11443                 return;
11444         }
11445         ohdr->checksum = val;
11446         switch (iph->ip_v) {
11447         case IPVERSION:
11448                 {
11449                         /* V4 */
11450                         struct ip *out;
11451                         sctp_route_t ro;
11452                         struct sctp_tcb *stcb = NULL;
11453
11454                         SCTP_BUF_LEN(mout) = sizeof(struct ip);
11455                         len += sizeof(struct ip);
11456                         if (port) {
11457                                 SCTP_BUF_LEN(mout) += sizeof(struct udphdr);
11458                                 len += sizeof(struct udphdr);
11459                         }
11460                         bzero(&ro, sizeof ro);
11461                         out = mtod(mout, struct ip *);
11462                         out->ip_v = iph->ip_v;
11463                         out->ip_hl = (sizeof(struct ip) / 4);
11464                         out->ip_tos = iph->ip_tos;
11465                         out->ip_id = iph->ip_id;
11466                         out->ip_off = 0;
11467                         out->ip_ttl = MAXTTL;
11468                         if (port) {
11469                                 out->ip_p = IPPROTO_UDP;
11470                         } else {
11471                                 out->ip_p = IPPROTO_SCTP;
11472                         }
11473                         out->ip_sum = 0;
11474                         out->ip_src = iph->ip_dst;
11475                         out->ip_dst = iph->ip_src;
11476                         out->ip_len = len;
11477                         if (port) {
11478                                 udp = (struct udphdr *)(out + 1);
11479                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11480                                 udp->uh_dport = port;
11481                                 udp->uh_ulen = htons(len - sizeof(struct ip));
11482                                 udp->uh_sum = in_pseudo(out->ip_src.s_addr, out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11483                         }
11484 #ifdef  SCTP_PACKET_LOGGING
11485                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11486                                 sctp_packet_log(mout, len);
11487 #endif
11488                         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11489                         if (port) {
11490                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11491                         }
11492                         SCTP_IP_OUTPUT(retcode, o_pak, &ro, stcb, vrf_id);
11493
11494                         SCTP_STAT_INCR(sctps_sendpackets);
11495                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11496                         /* Free the route if we got one back */
11497                         if (ro.ro_rt)
11498                                 RTFREE(ro.ro_rt);
11499                         break;
11500                 }
11501 #ifdef INET6
11502         case IPV6_VERSION >> 4:
11503                 {
11504                         /* V6 */
11505                         struct route_in6 ro;
11506                         int ret;
11507                         struct sctp_tcb *stcb = NULL;
11508                         struct ifnet *ifp = NULL;
11509                         struct ip6_hdr *out6, *in6;
11510
11511                         SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr);
11512                         len += sizeof(struct ip6_hdr);
11513                         bzero(&ro, sizeof ro);
11514                         if (port) {
11515                                 SCTP_BUF_LEN(mout) += sizeof(struct udphdr);
11516                                 len += sizeof(struct udphdr);
11517                         }
11518                         in6 = mtod(m, struct ip6_hdr *);
11519                         out6 = mtod(mout, struct ip6_hdr *);
11520                         out6->ip6_flow = in6->ip6_flow;
11521                         out6->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
11522                         if (port) {
11523                                 out6->ip6_nxt = IPPROTO_UDP;
11524                         } else {
11525                                 out6->ip6_nxt = IPPROTO_SCTP;
11526                         }
11527                         out6->ip6_src = in6->ip6_dst;
11528                         out6->ip6_dst = in6->ip6_src;
11529                         out6->ip6_plen = len - sizeof(struct ip6_hdr);
11530                         if (port) {
11531                                 udp = (struct udphdr *)(out6 + 1);
11532                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11533                                 udp->uh_dport = port;
11534                                 udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11535                                 udp->uh_sum = 0;
11536                         }
11537 #ifdef SCTP_DEBUG
11538                         bzero(&lsa6, sizeof(lsa6));
11539                         lsa6.sin6_len = sizeof(lsa6);
11540                         lsa6.sin6_family = AF_INET6;
11541                         lsa6.sin6_addr = out6->ip6_src;
11542                         bzero(&fsa6, sizeof(fsa6));
11543                         fsa6.sin6_len = sizeof(fsa6);
11544                         fsa6.sin6_family = AF_INET6;
11545                         fsa6.sin6_addr = out6->ip6_dst;
11546 #endif
11547                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_operr_to calling ipv6 output:\n");
11548                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "src: ");
11549                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&lsa6);
11550                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "dst ");
11551                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&fsa6);
11552
11553 #ifdef  SCTP_PACKET_LOGGING
11554                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11555                                 sctp_packet_log(mout, len);
11556 #endif
11557                         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11558                         if (port) {
11559                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11560                                         udp->uh_sum = 0xffff;
11561                                 }
11562                         }
11563                         SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
11564
11565                         SCTP_STAT_INCR(sctps_sendpackets);
11566                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11567                         /* Free the route if we got one back */
11568                         if (ro.ro_rt)
11569                                 RTFREE(ro.ro_rt);
11570                         break;
11571                 }
11572 #endif                          /* INET6 */
11573         default:
11574                 /* TSNH */
11575                 break;
11576         }
11577 }
11578
11579 static struct mbuf *
11580 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11581     struct uio *uio,
11582     struct sctp_sndrcvinfo *srcv,
11583     int max_send_len,
11584     int user_marks_eor,
11585     int *error,
11586     uint32_t * sndout,
11587     struct mbuf **new_tail)
11588 {
11589         struct mbuf *m;
11590
11591         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11592             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11593         if (m == NULL) {
11594                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11595                 *error = ENOMEM;
11596         } else {
11597                 *sndout = m_length(m, NULL);
11598                 *new_tail = m_last(m);
11599         }
11600         return (m);
11601 }
11602
11603 static int
11604 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11605     struct uio *uio,
11606     int resv_upfront)
11607 {
11608         int left;
11609
11610         left = sp->length;
11611         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11612             resv_upfront, 0);
11613         if (sp->data == NULL) {
11614                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11615                 return (ENOMEM);
11616         }
11617         sp->tail_mbuf = m_last(sp->data);
11618         return (0);
11619 }
11620
11621
11622
11623 static struct sctp_stream_queue_pending *
11624 sctp_copy_it_in(struct sctp_tcb *stcb,
11625     struct sctp_association *asoc,
11626     struct sctp_sndrcvinfo *srcv,
11627     struct uio *uio,
11628     struct sctp_nets *net,
11629     int max_send_len,
11630     int user_marks_eor,
11631     int *error,
11632     int non_blocking)
11633 {
11634         /*-
11635          * This routine must be very careful in its work. Protocol
11636          * processing is up and running so care must be taken to spl...()
11637          * when you need to do something that may effect the stcb/asoc. The
11638          * sb is locked however. When data is copied the protocol processing
11639          * should be enabled since this is a slower operation...
11640          */
11641         struct sctp_stream_queue_pending *sp = NULL;
11642         int resv_in_first;
11643
11644         *error = 0;
11645         /* Now can we send this? */
11646         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11647             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11648             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11649             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11650                 /* got data while shutting down */
11651                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11652                 *error = ECONNRESET;
11653                 goto out_now;
11654         }
11655         sctp_alloc_a_strmoq(stcb, sp);
11656         if (sp == NULL) {
11657                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11658                 *error = ENOMEM;
11659                 goto out_now;
11660         }
11661         sp->act_flags = 0;
11662         sp->sender_all_done = 0;
11663         sp->sinfo_flags = srcv->sinfo_flags;
11664         sp->timetolive = srcv->sinfo_timetolive;
11665         sp->ppid = srcv->sinfo_ppid;
11666         sp->context = srcv->sinfo_context;
11667         sp->strseq = 0;
11668         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11669
11670         sp->stream = srcv->sinfo_stream;
11671         sp->length = min(uio->uio_resid, max_send_len);
11672         if ((sp->length == (uint32_t) uio->uio_resid) &&
11673             ((user_marks_eor == 0) ||
11674             (srcv->sinfo_flags & SCTP_EOF) ||
11675             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11676                 sp->msg_is_complete = 1;
11677         } else {
11678                 sp->msg_is_complete = 0;
11679         }
11680         sp->sender_all_done = 0;
11681         sp->some_taken = 0;
11682         sp->put_last_out = 0;
11683         resv_in_first = sizeof(struct sctp_data_chunk);
11684         sp->data = sp->tail_mbuf = NULL;
11685         *error = sctp_copy_one(sp, uio, resv_in_first);
11686         if (*error) {
11687                 sctp_free_a_strmoq(stcb, sp);
11688                 sp = NULL;
11689         } else {
11690                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
11691                         sp->net = net;
11692                         sp->addr_over = 1;
11693                 } else {
11694                         sp->net = asoc->primary_destination;
11695                         sp->addr_over = 0;
11696                 }
11697                 atomic_add_int(&sp->net->ref_count, 1);
11698                 sctp_set_prsctp_policy(stcb, sp);
11699         }
11700 out_now:
11701         return (sp);
11702 }
11703
11704
11705 int
11706 sctp_sosend(struct socket *so,
11707     struct sockaddr *addr,
11708     struct uio *uio,
11709     struct mbuf *top,
11710     struct mbuf *control,
11711     int flags,
11712     struct thread *p
11713 )
11714 {
11715         struct sctp_inpcb *inp;
11716         int error, use_rcvinfo = 0;
11717         struct sctp_sndrcvinfo srcv;
11718         struct sockaddr *addr_to_use;
11719
11720 #ifdef INET6
11721         struct sockaddr_in sin;
11722
11723 #endif
11724
11725         inp = (struct sctp_inpcb *)so->so_pcb;
11726         if (control) {
11727                 /* process cmsg snd/rcv info (maybe a assoc-id) */
11728                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
11729                     sizeof(srcv))) {
11730                         /* got one */
11731                         use_rcvinfo = 1;
11732                 }
11733         }
11734         addr_to_use = addr;
11735 #if defined(INET6)  && !defined(__Userspace__)  /* TODO port in6_sin6_2_sin */
11736         if ((addr) && (addr->sa_family == AF_INET6)) {
11737                 struct sockaddr_in6 *sin6;
11738
11739                 sin6 = (struct sockaddr_in6 *)addr;
11740                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
11741                         in6_sin6_2_sin(&sin, sin6);
11742                         addr_to_use = (struct sockaddr *)&sin;
11743                 }
11744         }
11745 #endif
11746         error = sctp_lower_sosend(so, addr_to_use, uio, top,
11747             control,
11748             flags,
11749             use_rcvinfo, &srcv
11750             ,p
11751             );
11752         return (error);
11753 }
11754
11755
11756 int
11757 sctp_lower_sosend(struct socket *so,
11758     struct sockaddr *addr,
11759     struct uio *uio,
11760     struct mbuf *i_pak,
11761     struct mbuf *control,
11762     int flags,
11763     int use_rcvinfo,
11764     struct sctp_sndrcvinfo *srcv
11765     ,
11766     struct thread *p
11767 )
11768 {
11769         unsigned int sndlen = 0, max_len;
11770         int error, len;
11771         struct mbuf *top = NULL;
11772         int queue_only = 0, queue_only_for_init = 0;
11773         int free_cnt_applied = 0;
11774         int un_sent = 0;
11775         int now_filled = 0;
11776         unsigned int inqueue_bytes = 0;
11777         struct sctp_block_entry be;
11778         struct sctp_inpcb *inp;
11779         struct sctp_tcb *stcb = NULL;
11780         struct timeval now;
11781         struct sctp_nets *net;
11782         struct sctp_association *asoc;
11783         struct sctp_inpcb *t_inp;
11784         int user_marks_eor;
11785         int create_lock_applied = 0;
11786         int nagle_applies = 0;
11787         int some_on_control = 0;
11788         int got_all_of_the_send = 0;
11789         int hold_tcblock = 0;
11790         int non_blocking = 0;
11791         int temp_flags = 0;
11792         uint32_t local_add_more, local_soresv = 0;
11793
11794         error = 0;
11795         net = NULL;
11796         stcb = NULL;
11797         asoc = NULL;
11798
11799         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
11800         if (inp == NULL) {
11801                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11802                 error = EFAULT;
11803                 if (i_pak) {
11804                         SCTP_RELEASE_PKT(i_pak);
11805                 }
11806                 return (error);
11807         }
11808         if ((uio == NULL) && (i_pak == NULL)) {
11809                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11810                 return (EINVAL);
11811         }
11812         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
11813         atomic_add_int(&inp->total_sends, 1);
11814         if (uio) {
11815                 if (uio->uio_resid < 0) {
11816                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11817                         return (EINVAL);
11818                 }
11819                 sndlen = uio->uio_resid;
11820         } else {
11821                 top = SCTP_HEADER_TO_CHAIN(i_pak);
11822                 sndlen = SCTP_HEADER_LEN(i_pak);
11823         }
11824         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
11825             addr,
11826             sndlen);
11827         /*-
11828          * Pre-screen address, if one is given the sin-len
11829          * must be set correctly!
11830          */
11831         if (addr) {
11832                 if ((addr->sa_family == AF_INET) &&
11833                     (addr->sa_len != sizeof(struct sockaddr_in))) {
11834                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11835                         error = EINVAL;
11836                         goto out_unlocked;
11837                 } else if ((addr->sa_family == AF_INET6) &&
11838                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
11839                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11840                         error = EINVAL;
11841                         goto out_unlocked;
11842                 }
11843         }
11844         hold_tcblock = 0;
11845
11846         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
11847             (inp->sctp_socket->so_qlimit)) {
11848                 /* The listener can NOT send */
11849                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11850                 error = EFAULT;
11851                 goto out_unlocked;
11852         }
11853         if ((use_rcvinfo) && srcv) {
11854                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
11855                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
11856                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11857                         error = EINVAL;
11858                         goto out_unlocked;
11859                 }
11860                 if (srcv->sinfo_flags)
11861                         SCTP_STAT_INCR(sctps_sends_with_flags);
11862
11863                 if (srcv->sinfo_flags & SCTP_SENDALL) {
11864                         /* its a sendall */
11865                         error = sctp_sendall(inp, uio, top, srcv);
11866                         top = NULL;
11867                         goto out_unlocked;
11868                 }
11869         }
11870         /* now we must find the assoc */
11871         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
11872             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
11873                 SCTP_INP_RLOCK(inp);
11874                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
11875                 if (stcb == NULL) {
11876                         SCTP_INP_RUNLOCK(inp);
11877                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11878                         error = ENOTCONN;
11879                         goto out_unlocked;
11880                 }
11881                 hold_tcblock = 0;
11882                 SCTP_INP_RUNLOCK(inp);
11883                 if (addr) {
11884                         /* Must locate the net structure if addr given */
11885                         net = sctp_findnet(stcb, addr);
11886                         if (net) {
11887                                 /* validate port was 0 or correct */
11888                                 struct sockaddr_in *sin;
11889
11890                                 sin = (struct sockaddr_in *)addr;
11891                                 if ((sin->sin_port != 0) &&
11892                                     (sin->sin_port != stcb->rport)) {
11893                                         net = NULL;
11894                                 }
11895                         }
11896                         temp_flags |= SCTP_ADDR_OVER;
11897                 } else
11898                         net = stcb->asoc.primary_destination;
11899                 if (addr && (net == NULL)) {
11900                         /* Could not find address, was it legal */
11901                         if (addr->sa_family == AF_INET) {
11902                                 struct sockaddr_in *sin;
11903
11904                                 sin = (struct sockaddr_in *)addr;
11905                                 if (sin->sin_addr.s_addr == 0) {
11906                                         if ((sin->sin_port == 0) ||
11907                                             (sin->sin_port == stcb->rport)) {
11908                                                 net = stcb->asoc.primary_destination;
11909                                         }
11910                                 }
11911                         } else {
11912                                 struct sockaddr_in6 *sin6;
11913
11914                                 sin6 = (struct sockaddr_in6 *)addr;
11915                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
11916                                         if ((sin6->sin6_port == 0) ||
11917                                             (sin6->sin6_port == stcb->rport)) {
11918                                                 net = stcb->asoc.primary_destination;
11919                                         }
11920                                 }
11921                         }
11922                 }
11923                 if (net == NULL) {
11924                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11925                         error = EINVAL;
11926                         goto out_unlocked;
11927                 }
11928         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
11929                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
11930                 if (stcb) {
11931                         if (addr)
11932                                 /*
11933                                  * Must locate the net structure if addr
11934                                  * given
11935                                  */
11936                                 net = sctp_findnet(stcb, addr);
11937                         else
11938                                 net = stcb->asoc.primary_destination;
11939                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
11940                             ((net == NULL) || (addr == NULL))) {
11941                                 struct sockaddr_in *sin;
11942
11943                                 if (addr == NULL) {
11944                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11945                                         error = EINVAL;
11946                                         goto out_unlocked;
11947                                 }
11948                                 sin = (struct sockaddr_in *)addr;
11949                                 /* Validate port is 0 or correct */
11950                                 if ((sin->sin_port != 0) &&
11951                                     (sin->sin_port != stcb->rport)) {
11952                                         net = NULL;
11953                                 }
11954                         }
11955                 }
11956                 hold_tcblock = 0;
11957         } else if (addr) {
11958                 /*-
11959                  * Since we did not use findep we must
11960                  * increment it, and if we don't find a tcb
11961                  * decrement it.
11962                  */
11963                 SCTP_INP_WLOCK(inp);
11964                 SCTP_INP_INCR_REF(inp);
11965                 SCTP_INP_WUNLOCK(inp);
11966                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11967                 if (stcb == NULL) {
11968                         SCTP_INP_WLOCK(inp);
11969                         SCTP_INP_DECR_REF(inp);
11970                         SCTP_INP_WUNLOCK(inp);
11971                 } else {
11972                         hold_tcblock = 1;
11973                 }
11974         }
11975         if ((stcb == NULL) && (addr)) {
11976                 /* Possible implicit send? */
11977                 SCTP_ASOC_CREATE_LOCK(inp);
11978                 create_lock_applied = 1;
11979                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
11980                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
11981                         /* Should I really unlock ? */
11982                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11983                         error = EFAULT;
11984                         goto out_unlocked;
11985
11986                 }
11987                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
11988                     (addr->sa_family == AF_INET6)) {
11989                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11990                         error = EINVAL;
11991                         goto out_unlocked;
11992                 }
11993                 SCTP_INP_WLOCK(inp);
11994                 SCTP_INP_INCR_REF(inp);
11995                 SCTP_INP_WUNLOCK(inp);
11996                 /* With the lock applied look again */
11997                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11998                 if (stcb == NULL) {
11999                         SCTP_INP_WLOCK(inp);
12000                         SCTP_INP_DECR_REF(inp);
12001                         SCTP_INP_WUNLOCK(inp);
12002                 } else {
12003                         hold_tcblock = 1;
12004                 }
12005                 if (t_inp != inp) {
12006                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12007                         error = ENOTCONN;
12008                         goto out_unlocked;
12009                 }
12010         }
12011         if (stcb == NULL) {
12012                 if (addr == NULL) {
12013                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12014                         error = ENOENT;
12015                         goto out_unlocked;
12016                 } else {
12017                         /*
12018                          * UDP style, we must go ahead and start the INIT
12019                          * process
12020                          */
12021                         uint32_t vrf_id;
12022
12023                         if ((use_rcvinfo) && (srcv) &&
12024                             ((srcv->sinfo_flags & SCTP_ABORT) ||
12025                             ((srcv->sinfo_flags & SCTP_EOF) &&
12026                             (sndlen == 0)))) {
12027                                 /*-
12028                                  * User asks to abort a non-existant assoc,
12029                                  * or EOF a non-existant assoc with no data
12030                                  */
12031                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12032                                 error = ENOENT;
12033                                 goto out_unlocked;
12034                         }
12035                         /* get an asoc/stcb struct */
12036                         vrf_id = inp->def_vrf_id;
12037 #ifdef INVARIANTS
12038                         if (create_lock_applied == 0) {
12039                                 panic("Error, should hold create lock and I don't?");
12040                         }
12041 #endif
12042                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
12043                             p
12044                             );
12045                         if (stcb == NULL) {
12046                                 /* Error is setup for us in the call */
12047                                 goto out_unlocked;
12048                         }
12049                         if (create_lock_applied) {
12050                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12051                                 create_lock_applied = 0;
12052                         } else {
12053                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12054                         }
12055                         /*
12056                          * Turn on queue only flag to prevent data from
12057                          * being sent
12058                          */
12059                         queue_only = 1;
12060                         asoc = &stcb->asoc;
12061                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12062                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12063
12064                         /* initialize authentication params for the assoc */
12065                         sctp_initialize_auth_params(inp, stcb);
12066
12067                         if (control) {
12068                                 /*
12069                                  * see if a init structure exists in cmsg
12070                                  * headers
12071                                  */
12072                                 struct sctp_initmsg initm;
12073                                 int i;
12074
12075                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12076                                     sizeof(initm))) {
12077                                         /*
12078                                          * we have an INIT override of the
12079                                          * default
12080                                          */
12081                                         if (initm.sinit_max_attempts)
12082                                                 asoc->max_init_times = initm.sinit_max_attempts;
12083                                         if (initm.sinit_num_ostreams)
12084                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12085                                         if (initm.sinit_max_instreams)
12086                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12087                                         if (initm.sinit_max_init_timeo)
12088                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12089                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12090                                                 /* Default is NOT correct */
12091                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12092                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12093                                                 /*
12094                                                  * What happens if this
12095                                                  * fails? we panic ...
12096                                                  */
12097                                                 {
12098                                                         struct sctp_stream_out *tmp_str;
12099                                                         int had_lock = 0;
12100
12101                                                         if (hold_tcblock) {
12102                                                                 had_lock = 1;
12103                                                                 SCTP_TCB_UNLOCK(stcb);
12104                                                         }
12105                                                         SCTP_MALLOC(tmp_str,
12106                                                             struct sctp_stream_out *,
12107                                                             (asoc->pre_open_streams *
12108                                                             sizeof(struct sctp_stream_out)),
12109                                                             SCTP_M_STRMO);
12110                                                         if (had_lock) {
12111                                                                 SCTP_TCB_LOCK(stcb);
12112                                                         }
12113                                                         if (tmp_str != NULL) {
12114                                                                 SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12115                                                                 asoc->strmout = tmp_str;
12116                                                                 asoc->streamoutcnt = asoc->pre_open_streams;
12117                                                         } else {
12118                                                                 asoc->pre_open_streams = asoc->streamoutcnt;
12119                                                         }
12120                                                 }
12121                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12122                                                         /*-
12123                                                          * inbound side must be set
12124                                                          * to 0xffff, also NOTE when
12125                                                          * we get the INIT-ACK back
12126                                                          * (for INIT sender) we MUST
12127                                                          * reduce the count
12128                                                          * (streamoutcnt) but first
12129                                                          * check if we sent to any
12130                                                          * of the upper streams that
12131                                                          * were dropped (if some
12132                                                          * were). Those that were
12133                                                          * dropped must be notified
12134                                                          * to the upper layer as
12135                                                          * failed to send.
12136                                                          */
12137                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12138                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12139                                                         asoc->strmout[i].stream_no = i;
12140                                                         asoc->strmout[i].last_msg_incomplete = 0;
12141                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
12142                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
12143                                                 }
12144                                         }
12145                                 }
12146                         }
12147                         hold_tcblock = 1;
12148                         /* out with the INIT */
12149                         queue_only_for_init = 1;
12150                         /*-
12151                          * we may want to dig in after this call and adjust the MTU
12152                          * value. It defaulted to 1500 (constant) but the ro
12153                          * structure may now have an update and thus we may need to
12154                          * change it BEFORE we append the message.
12155                          */
12156                         net = stcb->asoc.primary_destination;
12157                         asoc = &stcb->asoc;
12158                 }
12159         }
12160         if ((SCTP_SO_IS_NBIO(so)
12161             || (flags & MSG_NBIO)
12162             )) {
12163                 non_blocking = 1;
12164         }
12165         asoc = &stcb->asoc;
12166
12167         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12168                 if (sndlen > asoc->smallest_mtu) {
12169                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12170                         error = EMSGSIZE;
12171                         goto out_unlocked;
12172                 }
12173         }
12174         /* would we block? */
12175         if (non_blocking) {
12176                 if (hold_tcblock == 0) {
12177                         SCTP_TCB_LOCK(stcb);
12178                         hold_tcblock = 1;
12179                 }
12180                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12181                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12182                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12183                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12184                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12185                                 error = EMSGSIZE;
12186                         else
12187                                 error = EWOULDBLOCK;
12188                         goto out_unlocked;
12189                 }
12190                 stcb->asoc.sb_send_resv += sndlen;
12191                 SCTP_TCB_UNLOCK(stcb);
12192                 hold_tcblock = 0;
12193         } else {
12194                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12195         }
12196         local_soresv = sndlen;
12197         /* Keep the stcb from being freed under our feet */
12198         if (free_cnt_applied) {
12199 #ifdef INVARIANTS
12200                 panic("refcnt already incremented");
12201 #else
12202                 printf("refcnt:1 already incremented?\n");
12203 #endif
12204         } else {
12205                 atomic_add_int(&stcb->asoc.refcnt, 1);
12206                 free_cnt_applied = 1;
12207         }
12208         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12209                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12210                 error = ECONNRESET;
12211                 goto out_unlocked;
12212         }
12213         if (create_lock_applied) {
12214                 SCTP_ASOC_CREATE_UNLOCK(inp);
12215                 create_lock_applied = 0;
12216         }
12217         if (asoc->stream_reset_outstanding) {
12218                 /*
12219                  * Can't queue any data while stream reset is underway.
12220                  */
12221                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12222                 error = EAGAIN;
12223                 goto out_unlocked;
12224         }
12225         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12226             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12227                 queue_only = 1;
12228         }
12229         if ((use_rcvinfo == 0) || (srcv == NULL)) {
12230                 /* Grab the default stuff from the asoc */
12231                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
12232         }
12233         /* we are now done with all control */
12234         if (control) {
12235                 sctp_m_freem(control);
12236                 control = NULL;
12237         }
12238         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12239             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12240             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12241             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12242                 if ((use_rcvinfo) &&
12243                     (srcv->sinfo_flags & SCTP_ABORT)) {
12244                         ;
12245                 } else {
12246                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12247                         error = ECONNRESET;
12248                         goto out_unlocked;
12249                 }
12250         }
12251         /* Ok, we will attempt a msgsnd :> */
12252         if (p) {
12253                 p->td_ru.ru_msgsnd++;
12254         }
12255         if (stcb) {
12256                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
12257                         net = stcb->asoc.primary_destination;
12258                 }
12259         }
12260         if (net == NULL) {
12261                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12262                 error = EINVAL;
12263                 goto out_unlocked;
12264         }
12265         if ((net->flight_size > net->cwnd) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12266                 /*-
12267                  * CMT: Added check for CMT above. net above is the primary
12268                  * dest. If CMT is ON, sender should always attempt to send
12269                  * with the output routine sctp_fill_outqueue() that loops
12270                  * through all destination addresses. Therefore, if CMT is
12271                  * ON, queue_only is NOT set to 1 here, so that
12272                  * sctp_chunk_output() can be called below.
12273                  */
12274                 queue_only = 1;
12275
12276         } else if (asoc->ifp_had_enobuf) {
12277                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12278                 if (net->flight_size > (net->mtu * 2))
12279                         queue_only = 1;
12280                 asoc->ifp_had_enobuf = 0;
12281         } else {
12282                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12283                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12284         }
12285         /* Are we aborting? */
12286         if (srcv->sinfo_flags & SCTP_ABORT) {
12287                 struct mbuf *mm;
12288                 int tot_demand, tot_out = 0, max_out;
12289
12290                 SCTP_STAT_INCR(sctps_sends_with_abort);
12291                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12292                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12293                         /* It has to be up before we abort */
12294                         /* how big is the user initiated abort? */
12295                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12296                         error = EINVAL;
12297                         goto out;
12298                 }
12299                 if (hold_tcblock) {
12300                         SCTP_TCB_UNLOCK(stcb);
12301                         hold_tcblock = 0;
12302                 }
12303                 if (top) {
12304                         struct mbuf *cntm = NULL;
12305
12306                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12307                         if (sndlen != 0) {
12308                                 cntm = top;
12309                                 while (cntm) {
12310                                         tot_out += SCTP_BUF_LEN(cntm);
12311                                         cntm = SCTP_BUF_NEXT(cntm);
12312                                 }
12313                         }
12314                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12315                 } else {
12316                         /* Must fit in a MTU */
12317                         tot_out = sndlen;
12318                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12319                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12320                                 /* To big */
12321                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12322                                 error = EMSGSIZE;
12323                                 goto out;
12324                         }
12325                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12326                 }
12327                 if (mm == NULL) {
12328                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12329                         error = ENOMEM;
12330                         goto out;
12331                 }
12332                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12333                 max_out -= sizeof(struct sctp_abort_msg);
12334                 if (tot_out > max_out) {
12335                         tot_out = max_out;
12336                 }
12337                 if (mm) {
12338                         struct sctp_paramhdr *ph;
12339
12340                         /* now move forward the data pointer */
12341                         ph = mtod(mm, struct sctp_paramhdr *);
12342                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12343                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12344                         ph++;
12345                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12346                         if (top == NULL) {
12347                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12348                                 if (error) {
12349                                         /*-
12350                                          * Here if we can't get his data we
12351                                          * still abort we just don't get to
12352                                          * send the users note :-0
12353                                          */
12354                                         sctp_m_freem(mm);
12355                                         mm = NULL;
12356                                 }
12357                         } else {
12358                                 if (sndlen != 0) {
12359                                         SCTP_BUF_NEXT(mm) = top;
12360                                 }
12361                         }
12362                 }
12363                 if (hold_tcblock == 0) {
12364                         SCTP_TCB_LOCK(stcb);
12365                         hold_tcblock = 1;
12366                 }
12367                 atomic_add_int(&stcb->asoc.refcnt, -1);
12368                 free_cnt_applied = 0;
12369                 /* release this lock, otherwise we hang on ourselves */
12370                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12371                     SCTP_RESPONSE_TO_USER_REQ,
12372                     mm, SCTP_SO_LOCKED);
12373                 /* now relock the stcb so everything is sane */
12374                 hold_tcblock = 0;
12375                 stcb = NULL;
12376                 /*
12377                  * In this case top is already chained to mm avoid double
12378                  * free, since we free it below if top != NULL and driver
12379                  * would free it after sending the packet out
12380                  */
12381                 if (sndlen != 0) {
12382                         top = NULL;
12383                 }
12384                 goto out_unlocked;
12385         }
12386         /* Calculate the maximum we can send */
12387         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12388         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12389                 if (non_blocking) {
12390                         /* we already checked for non-blocking above. */
12391                         max_len = sndlen;
12392                 } else {
12393                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12394                 }
12395         } else {
12396                 max_len = 0;
12397         }
12398         if (hold_tcblock) {
12399                 SCTP_TCB_UNLOCK(stcb);
12400                 hold_tcblock = 0;
12401         }
12402         /* Is the stream no. valid? */
12403         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12404                 /* Invalid stream number */
12405                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12406                 error = EINVAL;
12407                 goto out_unlocked;
12408         }
12409         if (asoc->strmout == NULL) {
12410                 /* huh? software error */
12411                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12412                 error = EFAULT;
12413                 goto out_unlocked;
12414         }
12415         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12416         if ((user_marks_eor == 0) &&
12417             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12418                 /* It will NEVER fit */
12419                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12420                 error = EMSGSIZE;
12421                 goto out_unlocked;
12422         }
12423         if ((uio == NULL) && user_marks_eor) {
12424                 /*-
12425                  * We do not support eeor mode for
12426                  * sending with mbuf chains (like sendfile).
12427                  */
12428                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12429                 error = EINVAL;
12430                 goto out_unlocked;
12431         }
12432         if (user_marks_eor) {
12433                 local_add_more = SCTP_BASE_SYSCTL(sctp_add_more_threshold);
12434         } else {
12435                 /*-
12436                  * For non-eeor the whole message must fit in
12437                  * the socket send buffer.
12438                  */
12439                 local_add_more = sndlen;
12440         }
12441         len = 0;
12442         if (non_blocking) {
12443                 goto skip_preblock;
12444         }
12445         if (((max_len <= local_add_more) &&
12446             (SCTP_SB_LIMIT_SND(so) > local_add_more)) ||
12447             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {   /* if */
12448                 /* No room right now ! */
12449                 SOCKBUF_LOCK(&so->so_snd);
12450                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12451                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12452                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue) /* while */ )) {
12453
12454                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12455                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA,
12456                                     so, asoc, sndlen);
12457                         }
12458                         be.error = 0;
12459                         stcb->block_entry = &be;
12460                         error = sbwait(&so->so_snd);
12461                         stcb->block_entry = NULL;
12462                         if (error || so->so_error || be.error) {
12463                                 if (error == 0) {
12464                                         if (so->so_error)
12465                                                 error = so->so_error;
12466                                         if (be.error) {
12467                                                 error = be.error;
12468                                         }
12469                                 }
12470                                 SOCKBUF_UNLOCK(&so->so_snd);
12471                                 goto out_unlocked;
12472                         }
12473                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12474                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12475                                     so, asoc, stcb->asoc.total_output_queue_size);
12476                         }
12477                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12478                                 goto out_unlocked;
12479                         }
12480                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12481                 }
12482                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12483                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12484                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12485                 } else {
12486                         max_len = 0;
12487                 }
12488                 SOCKBUF_UNLOCK(&so->so_snd);
12489         }
12490 skip_preblock:
12491         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12492                 goto out_unlocked;
12493         }
12494         atomic_add_int(&stcb->total_sends, 1);
12495         /*
12496          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12497          * case NOTE: uio will be null when top/mbuf is passed
12498          */
12499         if (sndlen == 0) {
12500                 if (srcv->sinfo_flags & SCTP_EOF) {
12501                         got_all_of_the_send = 1;
12502                         goto dataless_eof;
12503                 } else {
12504                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12505                         error = EINVAL;
12506                         goto out;
12507                 }
12508         }
12509         if (top == NULL) {
12510                 struct sctp_stream_queue_pending *sp;
12511                 struct sctp_stream_out *strm;
12512                 uint32_t sndout, initial_out;
12513
12514                 initial_out = uio->uio_resid;
12515
12516                 SCTP_TCB_SEND_LOCK(stcb);
12517                 if ((asoc->stream_locked) &&
12518                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12519                         SCTP_TCB_SEND_UNLOCK(stcb);
12520                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12521                         error = EINVAL;
12522                         goto out;
12523                 }
12524                 SCTP_TCB_SEND_UNLOCK(stcb);
12525
12526                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12527                 if (strm->last_msg_incomplete == 0) {
12528         do_a_copy_in:
12529                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12530                         if ((sp == NULL) || (error)) {
12531                                 goto out;
12532                         }
12533                         SCTP_TCB_SEND_LOCK(stcb);
12534                         if (sp->msg_is_complete) {
12535                                 strm->last_msg_incomplete = 0;
12536                                 asoc->stream_locked = 0;
12537                         } else {
12538                                 /*
12539                                  * Just got locked to this guy in case of an
12540                                  * interrupt.
12541                                  */
12542                                 strm->last_msg_incomplete = 1;
12543                                 asoc->stream_locked = 1;
12544                                 asoc->stream_locked_on = srcv->sinfo_stream;
12545                                 sp->sender_all_done = 0;
12546                         }
12547                         sctp_snd_sb_alloc(stcb, sp->length);
12548                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12549                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12550                                 sp->strseq = strm->next_sequence_sent;
12551                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12552                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12553                                             (uintptr_t) stcb, sp->length,
12554                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12555                                 }
12556                                 strm->next_sequence_sent++;
12557                         } else {
12558                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12559                         }
12560                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12561                         if ((strm->next_spoke.tqe_next == NULL) &&
12562                             (strm->next_spoke.tqe_prev == NULL)) {
12563                                 /* Not on wheel, insert */
12564                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
12565                         }
12566                         SCTP_TCB_SEND_UNLOCK(stcb);
12567                 } else {
12568                         SCTP_TCB_SEND_LOCK(stcb);
12569                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12570                         SCTP_TCB_SEND_UNLOCK(stcb);
12571                         if (sp == NULL) {
12572                                 /* ???? Huh ??? last msg is gone */
12573 #ifdef INVARIANTS
12574                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12575 #else
12576                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12577                                 strm->last_msg_incomplete = 0;
12578 #endif
12579                                 goto do_a_copy_in;
12580
12581                         }
12582                 }
12583                 while (uio->uio_resid > 0) {
12584                         /* How much room do we have? */
12585                         struct mbuf *new_tail, *mm;
12586
12587                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12588                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12589                         else
12590                                 max_len = 0;
12591
12592                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12593                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12594                             (uio->uio_resid &&
12595                             (uio->uio_resid <= (int)max_len))) {
12596                                 sndout = 0;
12597                                 new_tail = NULL;
12598                                 if (hold_tcblock) {
12599                                         SCTP_TCB_UNLOCK(stcb);
12600                                         hold_tcblock = 0;
12601                                 }
12602                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12603                                 if ((mm == NULL) || error) {
12604                                         if (mm) {
12605                                                 sctp_m_freem(mm);
12606                                         }
12607                                         goto out;
12608                                 }
12609                                 /* Update the mbuf and count */
12610                                 SCTP_TCB_SEND_LOCK(stcb);
12611                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12612                                         /*
12613                                          * we need to get out. Peer probably
12614                                          * aborted.
12615                                          */
12616                                         sctp_m_freem(mm);
12617                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12618                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12619                                                 error = ECONNRESET;
12620                                         }
12621                                         SCTP_TCB_SEND_UNLOCK(stcb);
12622                                         goto out;
12623                                 }
12624                                 if (sp->tail_mbuf) {
12625                                         /* tack it to the end */
12626                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12627                                         sp->tail_mbuf = new_tail;
12628                                 } else {
12629                                         /* A stolen mbuf */
12630                                         sp->data = mm;
12631                                         sp->tail_mbuf = new_tail;
12632                                 }
12633                                 sctp_snd_sb_alloc(stcb, sndout);
12634                                 atomic_add_int(&sp->length, sndout);
12635                                 len += sndout;
12636
12637                                 /* Did we reach EOR? */
12638                                 if ((uio->uio_resid == 0) &&
12639                                     ((user_marks_eor == 0) ||
12640                                     (srcv->sinfo_flags & SCTP_EOF) ||
12641                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
12642                                     ) {
12643                                         sp->msg_is_complete = 1;
12644                                 } else {
12645                                         sp->msg_is_complete = 0;
12646                                 }
12647                                 SCTP_TCB_SEND_UNLOCK(stcb);
12648                         }
12649                         if (uio->uio_resid == 0) {
12650                                 /* got it all? */
12651                                 continue;
12652                         }
12653                         /* PR-SCTP? */
12654                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12655                                 /*
12656                                  * This is ugly but we must assure locking
12657                                  * order
12658                                  */
12659                                 if (hold_tcblock == 0) {
12660                                         SCTP_TCB_LOCK(stcb);
12661                                         hold_tcblock = 1;
12662                                 }
12663                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12664                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12665                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12666                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12667                                 else
12668                                         max_len = 0;
12669                                 if (max_len > 0) {
12670                                         continue;
12671                                 }
12672                                 SCTP_TCB_UNLOCK(stcb);
12673                                 hold_tcblock = 0;
12674                         }
12675                         /* wait for space now */
12676                         if (non_blocking) {
12677                                 /* Non-blocking io in place out */
12678                                 goto skip_out_eof;
12679                         }
12680                         if ((net->flight_size > net->cwnd) &&
12681                             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12682                                 queue_only = 1;
12683                         } else if (asoc->ifp_had_enobuf) {
12684                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12685                                 if (net->flight_size > (net->mtu * 2)) {
12686                                         queue_only = 1;
12687                                 } else {
12688                                         queue_only = 0;
12689                                 }
12690                                 asoc->ifp_had_enobuf = 0;
12691                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12692                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12693                         } else {
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                                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12697                                         queue_only = 1;
12698                                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12699                                 } else if (net->flight_size > net->cwnd) {
12700                                         queue_only = 1;
12701                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12702                                 } else {
12703                                         queue_only = 0;
12704                                 }
12705                         }
12706                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12707                             (stcb->asoc.total_flight > 0) &&
12708                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12709                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12710                             ) {
12711
12712                                 /*-
12713                                  * Ok, Nagle is set on and we have data outstanding.
12714                                  * Don't send anything and let SACKs drive out the
12715                                  * data unless wen have a "full" segment to send.
12716                                  */
12717                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12718                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12719                                 }
12720                                 SCTP_STAT_INCR(sctps_naglequeued);
12721                                 nagle_applies = 1;
12722                         } else {
12723                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12724                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12725                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12726                                 }
12727                                 SCTP_STAT_INCR(sctps_naglesent);
12728                                 nagle_applies = 0;
12729                         }
12730                         /* What about the INIT, send it maybe */
12731                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12732
12733                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12734                                     nagle_applies, un_sent);
12735                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12736                                     stcb->asoc.total_flight,
12737                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12738                         }
12739                         if (queue_only_for_init) {
12740                                 if (hold_tcblock == 0) {
12741                                         SCTP_TCB_LOCK(stcb);
12742                                         hold_tcblock = 1;
12743                                 }
12744                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12745                                         /* a collision took us forward? */
12746                                         queue_only_for_init = 0;
12747                                         queue_only = 0;
12748                                 } else {
12749                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12750                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12751                                         queue_only_for_init = 0;
12752                                         queue_only = 1;
12753                                 }
12754                         }
12755                         if ((queue_only == 0) && (nagle_applies == 0)
12756                             ) {
12757                                 /*-
12758                                  * need to start chunk output
12759                                  * before blocking.. note that if
12760                                  * a lock is already applied, then
12761                                  * the input via the net is happening
12762                                  * and I don't need to start output :-D
12763                                  */
12764                                 if (hold_tcblock == 0) {
12765                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12766                                                 hold_tcblock = 1;
12767                                                 sctp_chunk_output(inp,
12768                                                     stcb,
12769                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12770                                         }
12771                                 } else {
12772                                         sctp_chunk_output(inp,
12773                                             stcb,
12774                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12775                                 }
12776                                 if (hold_tcblock == 1) {
12777                                         SCTP_TCB_UNLOCK(stcb);
12778                                         hold_tcblock = 0;
12779                                 }
12780                         }
12781                         SOCKBUF_LOCK(&so->so_snd);
12782                         /*-
12783                          * This is a bit strange, but I think it will
12784                          * work. The total_output_queue_size is locked and
12785                          * protected by the TCB_LOCK, which we just released.
12786                          * There is a race that can occur between releasing it
12787                          * above, and me getting the socket lock, where sacks
12788                          * come in but we have not put the SB_WAIT on the
12789                          * so_snd buffer to get the wakeup. After the LOCK
12790                          * is applied the sack_processing will also need to
12791                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12792                          * once we have the socket buffer lock if we recheck the
12793                          * size we KNOW we will get to sleep safely with the
12794                          * wakeup flag in place.
12795                          */
12796                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12797                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))
12798                             ) {
12799                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12800                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12801                                             so, asoc, uio->uio_resid);
12802                                 }
12803                                 be.error = 0;
12804                                 stcb->block_entry = &be;
12805                                 error = sbwait(&so->so_snd);
12806                                 stcb->block_entry = NULL;
12807
12808                                 if (error || so->so_error || be.error) {
12809                                         if (error == 0) {
12810                                                 if (so->so_error)
12811                                                         error = so->so_error;
12812                                                 if (be.error) {
12813                                                         error = be.error;
12814                                                 }
12815                                         }
12816                                         SOCKBUF_UNLOCK(&so->so_snd);
12817                                         goto out_unlocked;
12818                                 }
12819                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12820                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12821                                             so, asoc, stcb->asoc.total_output_queue_size);
12822                                 }
12823                         }
12824                         SOCKBUF_UNLOCK(&so->so_snd);
12825                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12826                                 goto out_unlocked;
12827                         }
12828                 }
12829                 SCTP_TCB_SEND_LOCK(stcb);
12830                 if (sp) {
12831                         if (sp->msg_is_complete == 0) {
12832                                 strm->last_msg_incomplete = 1;
12833                                 asoc->stream_locked = 1;
12834                                 asoc->stream_locked_on = srcv->sinfo_stream;
12835                         } else {
12836                                 sp->sender_all_done = 1;
12837                                 strm->last_msg_incomplete = 0;
12838                                 asoc->stream_locked = 0;
12839                         }
12840                 } else {
12841                         SCTP_PRINTF("Huh no sp TSNH?\n");
12842                         strm->last_msg_incomplete = 0;
12843                         asoc->stream_locked = 0;
12844                 }
12845                 SCTP_TCB_SEND_UNLOCK(stcb);
12846                 if (uio->uio_resid == 0) {
12847                         got_all_of_the_send = 1;
12848                 }
12849         } else if (top) {
12850                 /* We send in a 0, since we do NOT have any locks */
12851                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12852                 top = NULL;
12853                 if (srcv->sinfo_flags & SCTP_EOF) {
12854                         /*
12855                          * This should only happen for Panda for the mbuf
12856                          * send case, which does NOT yet support EEOR mode.
12857                          * Thus, we can just set this flag to do the proper
12858                          * EOF handling.
12859                          */
12860                         got_all_of_the_send = 1;
12861                 }
12862         }
12863         if (error) {
12864                 goto out;
12865         }
12866 dataless_eof:
12867         /* EOF thing ? */
12868         if ((srcv->sinfo_flags & SCTP_EOF) &&
12869             (got_all_of_the_send == 1) &&
12870             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)
12871             ) {
12872                 int cnt;
12873
12874                 SCTP_STAT_INCR(sctps_sends_with_eof);
12875                 error = 0;
12876                 if (hold_tcblock == 0) {
12877                         SCTP_TCB_LOCK(stcb);
12878                         hold_tcblock = 1;
12879                 }
12880                 cnt = sctp_is_there_unsent_data(stcb);
12881                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12882                     TAILQ_EMPTY(&asoc->sent_queue) &&
12883                     (cnt == 0)) {
12884                         if (asoc->locked_on_sending) {
12885                                 goto abort_anyway;
12886                         }
12887                         /* there is nothing queued to send, so I'm done... */
12888                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12889                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12890                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12891                                 /* only send SHUTDOWN the first time through */
12892                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
12893                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
12894                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
12895                                 }
12896                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
12897                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
12898                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
12899                                     asoc->primary_destination);
12900                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12901                                     asoc->primary_destination);
12902                         }
12903                 } else {
12904                         /*-
12905                          * we still got (or just got) data to send, so set
12906                          * SHUTDOWN_PENDING
12907                          */
12908                         /*-
12909                          * XXX sockets draft says that SCTP_EOF should be
12910                          * sent with no data.  currently, we will allow user
12911                          * data to be sent first and move to
12912                          * SHUTDOWN-PENDING
12913                          */
12914                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12915                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12916                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12917                                 if (hold_tcblock == 0) {
12918                                         SCTP_TCB_LOCK(stcb);
12919                                         hold_tcblock = 1;
12920                                 }
12921                                 if (asoc->locked_on_sending) {
12922                                         /* Locked to send out the data */
12923                                         struct sctp_stream_queue_pending *sp;
12924
12925                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
12926                                         if (sp) {
12927                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
12928                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
12929                                         }
12930                                 }
12931                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
12932                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12933                                     TAILQ_EMPTY(&asoc->sent_queue) &&
12934                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
12935                         abort_anyway:
12936                                         if (free_cnt_applied) {
12937                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
12938                                                 free_cnt_applied = 0;
12939                                         }
12940                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
12941                                             SCTP_RESPONSE_TO_USER_REQ,
12942                                             NULL, SCTP_SO_LOCKED);
12943                                         /*
12944                                          * now relock the stcb so everything
12945                                          * is sane
12946                                          */
12947                                         hold_tcblock = 0;
12948                                         stcb = NULL;
12949                                         goto out;
12950                                 }
12951                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12952                                     asoc->primary_destination);
12953                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
12954                         }
12955                 }
12956         }
12957 skip_out_eof:
12958         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
12959                 some_on_control = 1;
12960         }
12961         if ((net->flight_size > net->cwnd) &&
12962             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
12963                 queue_only = 1;
12964         } else if (asoc->ifp_had_enobuf) {
12965                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12966                 if (net->flight_size > (net->mtu * 2)) {
12967                         queue_only = 1;
12968                 } else {
12969                         queue_only = 0;
12970                 }
12971                 asoc->ifp_had_enobuf = 0;
12972                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12973                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12974         } else {
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                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12978                         queue_only = 1;
12979                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12980                 } else if (net->flight_size > net->cwnd) {
12981                         queue_only = 1;
12982                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12983                 } else {
12984                         queue_only = 0;
12985                 }
12986         }
12987         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12988             (stcb->asoc.total_flight > 0) &&
12989             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12990             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12991             ) {
12992                 /*-
12993                  * Ok, Nagle is set on and we have data outstanding.
12994                  * Don't send anything and let SACKs drive out the
12995                  * data unless wen have a "full" segment to send.
12996                  */
12997                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12998                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12999                 }
13000                 SCTP_STAT_INCR(sctps_naglequeued);
13001                 nagle_applies = 1;
13002         } else {
13003                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13004                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13005                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13006                 }
13007                 SCTP_STAT_INCR(sctps_naglesent);
13008                 nagle_applies = 0;
13009         }
13010         if (queue_only_for_init) {
13011                 if (hold_tcblock == 0) {
13012                         SCTP_TCB_LOCK(stcb);
13013                         hold_tcblock = 1;
13014                 }
13015                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13016                         /* a collision took us forward? */
13017                         queue_only_for_init = 0;
13018                         queue_only = 0;
13019                 } else {
13020                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13021                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13022                         queue_only_for_init = 0;
13023                         queue_only = 1;
13024                 }
13025         }
13026         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13027                 /* we can attempt to send too. */
13028                 if (hold_tcblock == 0) {
13029                         /*
13030                          * If there is activity recv'ing sacks no need to
13031                          * send
13032                          */
13033                         if (SCTP_TCB_TRYLOCK(stcb)) {
13034                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13035                                 hold_tcblock = 1;
13036                         }
13037                 } else {
13038                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13039                 }
13040         } else if ((queue_only == 0) &&
13041                     (stcb->asoc.peers_rwnd == 0) &&
13042             (stcb->asoc.total_flight == 0)) {
13043                 /* We get to have a probe outstanding */
13044                 if (hold_tcblock == 0) {
13045                         hold_tcblock = 1;
13046                         SCTP_TCB_LOCK(stcb);
13047                 }
13048                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13049         } else if (some_on_control) {
13050                 int num_out, reason, cwnd_full, frag_point;
13051
13052                 /* Here we do control only */
13053                 if (hold_tcblock == 0) {
13054                         hold_tcblock = 1;
13055                         SCTP_TCB_LOCK(stcb);
13056                 }
13057                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13058                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13059                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13060         }
13061         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d",
13062             queue_only, stcb->asoc.peers_rwnd, un_sent,
13063             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13064             stcb->asoc.total_output_queue_size, error);
13065
13066 out:
13067 out_unlocked:
13068
13069         if (local_soresv && stcb) {
13070                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13071                 local_soresv = 0;
13072         }
13073         if (create_lock_applied) {
13074                 SCTP_ASOC_CREATE_UNLOCK(inp);
13075                 create_lock_applied = 0;
13076         }
13077         if ((stcb) && hold_tcblock) {
13078                 SCTP_TCB_UNLOCK(stcb);
13079         }
13080         if (stcb && free_cnt_applied) {
13081                 atomic_add_int(&stcb->asoc.refcnt, -1);
13082         }
13083 #ifdef INVARIANTS
13084         if (stcb) {
13085                 if (mtx_owned(&stcb->tcb_mtx)) {
13086                         panic("Leaving with tcb mtx owned?");
13087                 }
13088                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13089                         panic("Leaving with tcb send mtx owned?");
13090                 }
13091         }
13092 #endif
13093         if (top) {
13094                 sctp_m_freem(top);
13095         }
13096         if (control) {
13097                 sctp_m_freem(control);
13098         }
13099         return (error);
13100 }
13101
13102
13103 /*
13104  * generate an AUTHentication chunk, if required
13105  */
13106 struct mbuf *
13107 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13108     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13109     struct sctp_tcb *stcb, uint8_t chunk)
13110 {
13111         struct mbuf *m_auth;
13112         struct sctp_auth_chunk *auth;
13113         int chunk_len;
13114
13115         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13116             (stcb == NULL))
13117                 return (m);
13118
13119         /* sysctl disabled auth? */
13120         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13121                 return (m);
13122
13123         /* peer doesn't do auth... */
13124         if (!stcb->asoc.peer_supports_auth) {
13125                 return (m);
13126         }
13127         /* does the requested chunk require auth? */
13128         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13129                 return (m);
13130         }
13131         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13132         if (m_auth == NULL) {
13133                 /* no mbuf's */
13134                 return (m);
13135         }
13136         /* reserve some space if this will be the first mbuf */
13137         if (m == NULL)
13138                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13139         /* fill in the AUTH chunk details */
13140         auth = mtod(m_auth, struct sctp_auth_chunk *);
13141         bzero(auth, sizeof(*auth));
13142         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13143         auth->ch.chunk_flags = 0;
13144         chunk_len = sizeof(*auth) +
13145             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13146         auth->ch.chunk_length = htons(chunk_len);
13147         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13148         /* key id and hmac digest will be computed and filled in upon send */
13149
13150         /* save the offset where the auth was inserted into the chain */
13151         if (m != NULL) {
13152                 struct mbuf *cn;
13153
13154                 *offset = 0;
13155                 cn = m;
13156                 while (cn) {
13157                         *offset += SCTP_BUF_LEN(cn);
13158                         cn = SCTP_BUF_NEXT(cn);
13159                 }
13160         } else
13161                 *offset = 0;
13162
13163         /* update length and return pointer to the auth chunk */
13164         SCTP_BUF_LEN(m_auth) = chunk_len;
13165         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13166         if (auth_ret != NULL)
13167                 *auth_ret = auth;
13168
13169         return (m);
13170 }
13171
13172 #ifdef INET6
13173 int
13174 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13175 {
13176         struct nd_prefix *pfx = NULL;
13177         struct nd_pfxrouter *pfxrtr = NULL;
13178         struct sockaddr_in6 gw6;
13179
13180         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13181                 return (0);
13182
13183         /* get prefix entry of address */
13184         LIST_FOREACH(pfx, &MODULE_GLOBAL(MOD_INET6, nd_prefix), ndpr_entry) {
13185                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13186                         continue;
13187                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13188                     &src6->sin6_addr, &pfx->ndpr_mask))
13189                         break;
13190         }
13191         /* no prefix entry in the prefix list */
13192         if (pfx == NULL) {
13193                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13194                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13195                 return (0);
13196         }
13197         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13198         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13199
13200         /* search installed gateway from prefix entry */
13201         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13202             pfxrtr->pfr_next) {
13203                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13204                 gw6.sin6_family = AF_INET6;
13205                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13206                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13207                     sizeof(struct in6_addr));
13208                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13209                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13210                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13211                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13212                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13213                     ro->ro_rt->rt_gateway)) {
13214                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13215                         return (1);
13216                 }
13217         }
13218         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13219         return (0);
13220 }
13221
13222 #endif
13223
13224 int
13225 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13226 {
13227         struct sockaddr_in *sin, *mask;
13228         struct ifaddr *ifa;
13229         struct in_addr srcnetaddr, gwnetaddr;
13230
13231         if (ro == NULL || ro->ro_rt == NULL ||
13232             sifa->address.sa.sa_family != AF_INET) {
13233                 return (0);
13234         }
13235         ifa = (struct ifaddr *)sifa->ifa;
13236         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13237         sin = (struct sockaddr_in *)&sifa->address.sin;
13238         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13239         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13240         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13241         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13242
13243         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13244         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13245         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13246         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13247         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13248         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13249                 return (1);
13250         }
13251         return (0);
13252 }